Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
Zach Brown | ec6b910 | 2007-07-11 10:00:37 -0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 20 | #include <linux/writeback.h> |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 21 | #include <linux/blkdev.h> |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 22 | #include <linux/sort.h> |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 23 | #include <linux/rcupdate.h> |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 24 | #include <linux/kthread.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
David Sterba | dff51cd | 2011-06-14 12:52:17 +0200 | [diff] [blame] | 26 | #include <linux/ratelimit.h> |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 27 | #include <linux/percpu_counter.h> |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 28 | #include "hash.h" |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 29 | #include "tree-log.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 30 | #include "disk-io.h" |
| 31 | #include "print-tree.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 32 | #include "volumes.h" |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 33 | #include "raid56.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 34 | #include "locking.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 35 | #include "free-space-cache.h" |
Miao Xie | 3fed40c | 2012-09-13 04:51:36 -0600 | [diff] [blame] | 36 | #include "math.h" |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 37 | #include "sysfs.h" |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 38 | #include "qgroup.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 39 | |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 40 | #undef SCRAMBLE_DELAYED_REFS |
| 41 | |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 42 | /* |
| 43 | * control flags for do_chunk_alloc's force field |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
| 45 | * if we really need one. |
| 46 | * |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
| 48 | * if we have very few chunks already allocated. This is |
| 49 | * used as part of the clustering code to help make sure |
| 50 | * we have a good pool of storage to cluster in, without |
| 51 | * filling the FS with empty chunks |
| 52 | * |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 53 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
| 54 | * |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 55 | */ |
| 56 | enum { |
| 57 | CHUNK_ALLOC_NO_FORCE = 0, |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 58 | CHUNK_ALLOC_LIMITED = 1, |
| 59 | CHUNK_ALLOC_FORCE = 2, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 60 | }; |
| 61 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 62 | /* |
| 63 | * Control how reservations are dealt with. |
| 64 | * |
| 65 | * RESERVE_FREE - freeing a reservation. |
| 66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for |
| 67 | * ENOSPC accounting |
| 68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update |
| 69 | * bytes_may_use as the ENOSPC accounting is done elsewhere |
| 70 | */ |
| 71 | enum { |
| 72 | RESERVE_FREE = 0, |
| 73 | RESERVE_ALLOC = 1, |
| 74 | RESERVE_ALLOC_NO_ACCOUNT = 2, |
| 75 | }; |
| 76 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 77 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 78 | struct btrfs_root *root, u64 bytenr, |
| 79 | u64 num_bytes, int alloc); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 80 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 81 | struct btrfs_root *root, |
| 82 | u64 bytenr, u64 num_bytes, u64 parent, |
| 83 | u64 root_objectid, u64 owner_objectid, |
| 84 | u64 owner_offset, int refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 85 | struct btrfs_delayed_extent_op *extra_op, |
| 86 | int no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 87 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 88 | struct extent_buffer *leaf, |
| 89 | struct btrfs_extent_item *ei); |
| 90 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 91 | struct btrfs_root *root, |
| 92 | u64 parent, u64 root_objectid, |
| 93 | u64 flags, u64 owner, u64 offset, |
| 94 | struct btrfs_key *ins, int ref_mod); |
| 95 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 96 | struct btrfs_root *root, |
| 97 | u64 parent, u64 root_objectid, |
| 98 | u64 flags, struct btrfs_disk_key *key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 99 | int level, struct btrfs_key *ins, |
| 100 | int no_quota); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 101 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 102 | struct btrfs_root *extent_root, u64 flags, |
| 103 | int force); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 104 | static int find_next_key(struct btrfs_path *path, int level, |
| 105 | struct btrfs_key *key); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 106 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 107 | int dump_block_groups); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 108 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 109 | u64 num_bytes, int reserve, |
| 110 | int delalloc); |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 111 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 112 | u64 num_bytes); |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 113 | int btrfs_pin_extent(struct btrfs_root *root, |
| 114 | u64 bytenr, u64 num_bytes, int reserved); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 115 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 116 | static noinline int |
| 117 | block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 118 | { |
| 119 | smp_mb(); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 120 | return cache->cached == BTRFS_CACHE_FINISHED || |
| 121 | cache->cached == BTRFS_CACHE_ERROR; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 122 | } |
| 123 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 124 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 125 | { |
| 126 | return (cache->flags & bits) == bits; |
| 127 | } |
| 128 | |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 129 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 130 | { |
| 131 | atomic_inc(&cache->count); |
| 132 | } |
| 133 | |
| 134 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) |
| 135 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 136 | if (atomic_dec_and_test(&cache->count)) { |
| 137 | WARN_ON(cache->pinned > 0); |
| 138 | WARN_ON(cache->reserved > 0); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 139 | kfree(cache->free_space_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 140 | kfree(cache); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 141 | } |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 142 | } |
| 143 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 144 | /* |
| 145 | * this adds the block group to the fs_info rb tree for the block group |
| 146 | * cache |
| 147 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 148 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 149 | struct btrfs_block_group_cache *block_group) |
| 150 | { |
| 151 | struct rb_node **p; |
| 152 | struct rb_node *parent = NULL; |
| 153 | struct btrfs_block_group_cache *cache; |
| 154 | |
| 155 | spin_lock(&info->block_group_cache_lock); |
| 156 | p = &info->block_group_cache_tree.rb_node; |
| 157 | |
| 158 | while (*p) { |
| 159 | parent = *p; |
| 160 | cache = rb_entry(parent, struct btrfs_block_group_cache, |
| 161 | cache_node); |
| 162 | if (block_group->key.objectid < cache->key.objectid) { |
| 163 | p = &(*p)->rb_left; |
| 164 | } else if (block_group->key.objectid > cache->key.objectid) { |
| 165 | p = &(*p)->rb_right; |
| 166 | } else { |
| 167 | spin_unlock(&info->block_group_cache_lock); |
| 168 | return -EEXIST; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | rb_link_node(&block_group->cache_node, parent, p); |
| 173 | rb_insert_color(&block_group->cache_node, |
| 174 | &info->block_group_cache_tree); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 175 | |
| 176 | if (info->first_logical_byte > block_group->key.objectid) |
| 177 | info->first_logical_byte = block_group->key.objectid; |
| 178 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 179 | spin_unlock(&info->block_group_cache_lock); |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * This will return the block group at or after bytenr if contains is 0, else |
| 186 | * it will return the block group that contains the bytenr |
| 187 | */ |
| 188 | static struct btrfs_block_group_cache * |
| 189 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, |
| 190 | int contains) |
| 191 | { |
| 192 | struct btrfs_block_group_cache *cache, *ret = NULL; |
| 193 | struct rb_node *n; |
| 194 | u64 end, start; |
| 195 | |
| 196 | spin_lock(&info->block_group_cache_lock); |
| 197 | n = info->block_group_cache_tree.rb_node; |
| 198 | |
| 199 | while (n) { |
| 200 | cache = rb_entry(n, struct btrfs_block_group_cache, |
| 201 | cache_node); |
| 202 | end = cache->key.objectid + cache->key.offset - 1; |
| 203 | start = cache->key.objectid; |
| 204 | |
| 205 | if (bytenr < start) { |
| 206 | if (!contains && (!ret || start < ret->key.objectid)) |
| 207 | ret = cache; |
| 208 | n = n->rb_left; |
| 209 | } else if (bytenr > start) { |
| 210 | if (contains && bytenr <= end) { |
| 211 | ret = cache; |
| 212 | break; |
| 213 | } |
| 214 | n = n->rb_right; |
| 215 | } else { |
| 216 | ret = cache; |
| 217 | break; |
| 218 | } |
| 219 | } |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 220 | if (ret) { |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 221 | btrfs_get_block_group(ret); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 222 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
| 223 | info->first_logical_byte = ret->key.objectid; |
| 224 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 225 | spin_unlock(&info->block_group_cache_lock); |
| 226 | |
| 227 | return ret; |
| 228 | } |
| 229 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 230 | static int add_excluded_extent(struct btrfs_root *root, |
| 231 | u64 start, u64 num_bytes) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 232 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 233 | u64 end = start + num_bytes - 1; |
| 234 | set_extent_bits(&root->fs_info->freed_extents[0], |
| 235 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 236 | set_extent_bits(&root->fs_info->freed_extents[1], |
| 237 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 238 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 239 | } |
| 240 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 241 | static void free_excluded_extents(struct btrfs_root *root, |
| 242 | struct btrfs_block_group_cache *cache) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 243 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 244 | u64 start, end; |
| 245 | |
| 246 | start = cache->key.objectid; |
| 247 | end = start + cache->key.offset - 1; |
| 248 | |
| 249 | clear_extent_bits(&root->fs_info->freed_extents[0], |
| 250 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 251 | clear_extent_bits(&root->fs_info->freed_extents[1], |
| 252 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 253 | } |
| 254 | |
| 255 | static int exclude_super_stripes(struct btrfs_root *root, |
| 256 | struct btrfs_block_group_cache *cache) |
| 257 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 258 | u64 bytenr; |
| 259 | u64 *logical; |
| 260 | int stripe_len; |
| 261 | int i, nr, ret; |
| 262 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 263 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
| 264 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; |
| 265 | cache->bytes_super += stripe_len; |
| 266 | ret = add_excluded_extent(root, cache->key.objectid, |
| 267 | stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 268 | if (ret) |
| 269 | return ret; |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 270 | } |
| 271 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 272 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 273 | bytenr = btrfs_sb_offset(i); |
| 274 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| 275 | cache->key.objectid, bytenr, |
| 276 | 0, &logical, &nr, &stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 277 | if (ret) |
| 278 | return ret; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 279 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 280 | while (nr--) { |
Josef Bacik | 51bf5f0 | 2013-04-23 12:55:21 -0400 | [diff] [blame] | 281 | u64 start, len; |
| 282 | |
| 283 | if (logical[nr] > cache->key.objectid + |
| 284 | cache->key.offset) |
| 285 | continue; |
| 286 | |
| 287 | if (logical[nr] + stripe_len <= cache->key.objectid) |
| 288 | continue; |
| 289 | |
| 290 | start = logical[nr]; |
| 291 | if (start < cache->key.objectid) { |
| 292 | start = cache->key.objectid; |
| 293 | len = (logical[nr] + stripe_len) - start; |
| 294 | } else { |
| 295 | len = min_t(u64, stripe_len, |
| 296 | cache->key.objectid + |
| 297 | cache->key.offset - start); |
| 298 | } |
| 299 | |
| 300 | cache->bytes_super += len; |
| 301 | ret = add_excluded_extent(root, start, len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 302 | if (ret) { |
| 303 | kfree(logical); |
| 304 | return ret; |
| 305 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 306 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 307 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 308 | kfree(logical); |
| 309 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 310 | return 0; |
| 311 | } |
| 312 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 313 | static struct btrfs_caching_control * |
| 314 | get_caching_control(struct btrfs_block_group_cache *cache) |
| 315 | { |
| 316 | struct btrfs_caching_control *ctl; |
| 317 | |
| 318 | spin_lock(&cache->lock); |
Josef Bacik | dde5abe | 2010-09-16 16:17:03 -0400 | [diff] [blame] | 319 | if (!cache->caching_ctl) { |
| 320 | spin_unlock(&cache->lock); |
| 321 | return NULL; |
| 322 | } |
| 323 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 324 | ctl = cache->caching_ctl; |
| 325 | atomic_inc(&ctl->count); |
| 326 | spin_unlock(&cache->lock); |
| 327 | return ctl; |
| 328 | } |
| 329 | |
| 330 | static void put_caching_control(struct btrfs_caching_control *ctl) |
| 331 | { |
| 332 | if (atomic_dec_and_test(&ctl->count)) |
| 333 | kfree(ctl); |
| 334 | } |
| 335 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 336 | /* |
| 337 | * this is only called by cache_block_group, since we could have freed extents |
| 338 | * we need to check the pinned_extents for any extents that can't be used yet |
| 339 | * since their free space will be released as soon as the transaction commits. |
| 340 | */ |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 341 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 342 | struct btrfs_fs_info *info, u64 start, u64 end) |
| 343 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 344 | u64 extent_start, extent_end, size, total_added = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 345 | int ret; |
| 346 | |
| 347 | while (start < end) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 348 | ret = find_first_extent_bit(info->pinned_extents, start, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 349 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 350 | EXTENT_DIRTY | EXTENT_UPTODATE, |
| 351 | NULL); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 352 | if (ret) |
| 353 | break; |
| 354 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 355 | if (extent_start <= start) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 356 | start = extent_end + 1; |
| 357 | } else if (extent_start > start && extent_start < end) { |
| 358 | size = extent_start - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 359 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 360 | ret = btrfs_add_free_space(block_group, start, |
| 361 | size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 362 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 363 | start = extent_end + 1; |
| 364 | } else { |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | if (start < end) { |
| 370 | size = end - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 371 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 372 | ret = btrfs_add_free_space(block_group, start, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 373 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 374 | } |
| 375 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 376 | return total_added; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 377 | } |
| 378 | |
Qu Wenruo | d458b05 | 2014-02-28 10:46:19 +0800 | [diff] [blame] | 379 | static noinline void caching_thread(struct btrfs_work *work) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 380 | { |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 381 | struct btrfs_block_group_cache *block_group; |
| 382 | struct btrfs_fs_info *fs_info; |
| 383 | struct btrfs_caching_control *caching_ctl; |
| 384 | struct btrfs_root *extent_root; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 385 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 386 | struct extent_buffer *leaf; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 387 | struct btrfs_key key; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 388 | u64 total_found = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 389 | u64 last = 0; |
| 390 | u32 nritems; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 391 | int ret = -ENOMEM; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 392 | |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 393 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
| 394 | block_group = caching_ctl->block_group; |
| 395 | fs_info = block_group->fs_info; |
| 396 | extent_root = fs_info->extent_root; |
| 397 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 398 | path = btrfs_alloc_path(); |
| 399 | if (!path) |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 400 | goto out; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 401 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 402 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 403 | |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 404 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 405 | * We don't want to deadlock with somebody trying to allocate a new |
| 406 | * extent for the extent root while also trying to search the extent |
| 407 | * root to add free space. So we skip locking and search the commit |
| 408 | * root, since its read-only |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 409 | */ |
| 410 | path->skip_locking = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 411 | path->search_commit_root = 1; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 412 | path->reada = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 413 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 414 | key.objectid = last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 415 | key.offset = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 416 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 417 | again: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 418 | mutex_lock(&caching_ctl->mutex); |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 419 | /* need to make sure the commit_root doesn't disappear */ |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 420 | down_read(&fs_info->commit_root_sem); |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 421 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 422 | next: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 423 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 424 | if (ret < 0) |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 425 | goto err; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 426 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 427 | leaf = path->nodes[0]; |
| 428 | nritems = btrfs_header_nritems(leaf); |
| 429 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 430 | while (1) { |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 431 | if (btrfs_fs_closing(fs_info) > 1) { |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 432 | last = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 433 | break; |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 434 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 435 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 436 | if (path->slots[0] < nritems) { |
| 437 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 438 | } else { |
| 439 | ret = find_next_key(path, 0, &key); |
| 440 | if (ret) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 441 | break; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 442 | |
Josef Bacik | c9ea7b2 | 2013-09-19 10:02:11 -0400 | [diff] [blame] | 443 | if (need_resched() || |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 444 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 445 | caching_ctl->progress = last; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 446 | btrfs_release_path(path); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 447 | up_read(&fs_info->commit_root_sem); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 448 | mutex_unlock(&caching_ctl->mutex); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 449 | cond_resched(); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 450 | goto again; |
| 451 | } |
Josef Bacik | 0a3896d | 2013-04-19 14:37:26 -0400 | [diff] [blame] | 452 | |
| 453 | ret = btrfs_next_leaf(extent_root, path); |
| 454 | if (ret < 0) |
| 455 | goto err; |
| 456 | if (ret) |
| 457 | break; |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 458 | leaf = path->nodes[0]; |
| 459 | nritems = btrfs_header_nritems(leaf); |
| 460 | continue; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 461 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 462 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 463 | if (key.objectid < last) { |
| 464 | key.objectid = last; |
| 465 | key.offset = 0; |
| 466 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 467 | |
| 468 | caching_ctl->progress = last; |
| 469 | btrfs_release_path(path); |
| 470 | goto next; |
| 471 | } |
| 472 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 473 | if (key.objectid < block_group->key.objectid) { |
| 474 | path->slots[0]++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 475 | continue; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 476 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 477 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 478 | if (key.objectid >= block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 479 | block_group->key.offset) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 480 | break; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 481 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 482 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
| 483 | key.type == BTRFS_METADATA_ITEM_KEY) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 484 | total_found += add_new_free_space(block_group, |
| 485 | fs_info, last, |
| 486 | key.objectid); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 487 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
| 488 | last = key.objectid + |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 489 | fs_info->tree_root->nodesize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 490 | else |
| 491 | last = key.objectid + key.offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 492 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 493 | if (total_found > (1024 * 1024 * 2)) { |
| 494 | total_found = 0; |
| 495 | wake_up(&caching_ctl->wait); |
| 496 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 497 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 498 | path->slots[0]++; |
| 499 | } |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 500 | ret = 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 501 | |
| 502 | total_found += add_new_free_space(block_group, fs_info, last, |
| 503 | block_group->key.objectid + |
| 504 | block_group->key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 505 | caching_ctl->progress = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 506 | |
| 507 | spin_lock(&block_group->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 508 | block_group->caching_ctl = NULL; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 509 | block_group->cached = BTRFS_CACHE_FINISHED; |
| 510 | spin_unlock(&block_group->lock); |
| 511 | |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 512 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 513 | btrfs_free_path(path); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 514 | up_read(&fs_info->commit_root_sem); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 515 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 516 | free_excluded_extents(extent_root, block_group); |
| 517 | |
| 518 | mutex_unlock(&caching_ctl->mutex); |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 519 | out: |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 520 | if (ret) { |
| 521 | spin_lock(&block_group->lock); |
| 522 | block_group->caching_ctl = NULL; |
| 523 | block_group->cached = BTRFS_CACHE_ERROR; |
| 524 | spin_unlock(&block_group->lock); |
| 525 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 526 | wake_up(&caching_ctl->wait); |
| 527 | |
| 528 | put_caching_control(caching_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 529 | btrfs_put_block_group(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 530 | } |
| 531 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 532 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 533 | int load_cache_only) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 534 | { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 535 | DEFINE_WAIT(wait); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 536 | struct btrfs_fs_info *fs_info = cache->fs_info; |
| 537 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 538 | int ret = 0; |
| 539 | |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 540 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 541 | if (!caching_ctl) |
| 542 | return -ENOMEM; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 543 | |
| 544 | INIT_LIST_HEAD(&caching_ctl->list); |
| 545 | mutex_init(&caching_ctl->mutex); |
| 546 | init_waitqueue_head(&caching_ctl->wait); |
| 547 | caching_ctl->block_group = cache; |
| 548 | caching_ctl->progress = cache->key.objectid; |
| 549 | atomic_set(&caching_ctl->count, 1); |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 550 | btrfs_init_work(&caching_ctl->work, btrfs_cache_helper, |
| 551 | caching_thread, NULL, NULL); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 552 | |
| 553 | spin_lock(&cache->lock); |
| 554 | /* |
| 555 | * This should be a rare occasion, but this could happen I think in the |
| 556 | * case where one thread starts to load the space cache info, and then |
| 557 | * some other thread starts a transaction commit which tries to do an |
| 558 | * allocation while the other thread is still loading the space cache |
| 559 | * info. The previous loop should have kept us from choosing this block |
| 560 | * group, but if we've moved to the state where we will wait on caching |
| 561 | * block groups we need to first check if we're doing a fast load here, |
| 562 | * so we can wait for it to finish, otherwise we could end up allocating |
| 563 | * from a block group who's cache gets evicted for one reason or |
| 564 | * another. |
| 565 | */ |
| 566 | while (cache->cached == BTRFS_CACHE_FAST) { |
| 567 | struct btrfs_caching_control *ctl; |
| 568 | |
| 569 | ctl = cache->caching_ctl; |
| 570 | atomic_inc(&ctl->count); |
| 571 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); |
| 572 | spin_unlock(&cache->lock); |
| 573 | |
| 574 | schedule(); |
| 575 | |
| 576 | finish_wait(&ctl->wait, &wait); |
| 577 | put_caching_control(ctl); |
| 578 | spin_lock(&cache->lock); |
| 579 | } |
| 580 | |
| 581 | if (cache->cached != BTRFS_CACHE_NO) { |
| 582 | spin_unlock(&cache->lock); |
| 583 | kfree(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 584 | return 0; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 585 | } |
| 586 | WARN_ON(cache->caching_ctl); |
| 587 | cache->caching_ctl = caching_ctl; |
| 588 | cache->cached = BTRFS_CACHE_FAST; |
| 589 | spin_unlock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 590 | |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 591 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
Josef Bacik | cb83b7b | 2014-11-26 11:52:54 -0500 | [diff] [blame] | 592 | mutex_lock(&caching_ctl->mutex); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 593 | ret = load_free_space_cache(fs_info, cache); |
| 594 | |
| 595 | spin_lock(&cache->lock); |
| 596 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 597 | cache->caching_ctl = NULL; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 598 | cache->cached = BTRFS_CACHE_FINISHED; |
| 599 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | cb83b7b | 2014-11-26 11:52:54 -0500 | [diff] [blame] | 600 | caching_ctl->progress = (u64)-1; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 601 | } else { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 602 | if (load_cache_only) { |
| 603 | cache->caching_ctl = NULL; |
| 604 | cache->cached = BTRFS_CACHE_NO; |
| 605 | } else { |
| 606 | cache->cached = BTRFS_CACHE_STARTED; |
Filipe Manana | 4f69cb9 | 2014-11-26 15:28:51 +0000 | [diff] [blame] | 607 | cache->has_caching_ctl = 1; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 608 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 609 | } |
| 610 | spin_unlock(&cache->lock); |
Josef Bacik | cb83b7b | 2014-11-26 11:52:54 -0500 | [diff] [blame] | 611 | mutex_unlock(&caching_ctl->mutex); |
| 612 | |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 613 | wake_up(&caching_ctl->wait); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 614 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 615 | put_caching_control(caching_ctl); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 616 | free_excluded_extents(fs_info->extent_root, cache); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 617 | return 0; |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 618 | } |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 619 | } else { |
| 620 | /* |
| 621 | * We are not going to do the fast caching, set cached to the |
| 622 | * appropriate value and wakeup any waiters. |
| 623 | */ |
| 624 | spin_lock(&cache->lock); |
| 625 | if (load_cache_only) { |
| 626 | cache->caching_ctl = NULL; |
| 627 | cache->cached = BTRFS_CACHE_NO; |
| 628 | } else { |
| 629 | cache->cached = BTRFS_CACHE_STARTED; |
Filipe Manana | 4f69cb9 | 2014-11-26 15:28:51 +0000 | [diff] [blame] | 630 | cache->has_caching_ctl = 1; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 631 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 632 | spin_unlock(&cache->lock); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 633 | wake_up(&caching_ctl->wait); |
| 634 | } |
| 635 | |
| 636 | if (load_cache_only) { |
| 637 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 638 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 639 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 640 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 641 | down_write(&fs_info->commit_root_sem); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 642 | atomic_inc(&caching_ctl->count); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 643 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 644 | up_write(&fs_info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 645 | |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 646 | btrfs_get_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 647 | |
Qu Wenruo | e66f0bb | 2014-02-28 10:46:12 +0800 | [diff] [blame] | 648 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 649 | |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 650 | return ret; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 651 | } |
| 652 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 653 | /* |
| 654 | * return the block group that starts at or after bytenr |
| 655 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 656 | static struct btrfs_block_group_cache * |
| 657 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 658 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 659 | struct btrfs_block_group_cache *cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 660 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 661 | cache = block_group_cache_tree_search(info, bytenr, 0); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 662 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 663 | return cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 664 | } |
| 665 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 666 | /* |
Sankar P | 9f55684 | 2009-05-14 13:52:22 -0400 | [diff] [blame] | 667 | * return the block group that contains the given bytenr |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 668 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 669 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| 670 | struct btrfs_fs_info *info, |
| 671 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 672 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 673 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 674 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 675 | cache = block_group_cache_tree_search(info, bytenr, 1); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 676 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 677 | return cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 678 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 679 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 680 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 681 | u64 flags) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 682 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 683 | struct list_head *head = &info->space_info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 684 | struct btrfs_space_info *found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 685 | |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 686 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 687 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 688 | rcu_read_lock(); |
| 689 | list_for_each_entry_rcu(found, head, list) { |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 690 | if (found->flags & flags) { |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 691 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 692 | return found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 693 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 694 | } |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 695 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 696 | return NULL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 697 | } |
| 698 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 699 | /* |
| 700 | * after adding space to the filesystem, we need to clear the full flags |
| 701 | * on all the space infos. |
| 702 | */ |
| 703 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) |
| 704 | { |
| 705 | struct list_head *head = &info->space_info; |
| 706 | struct btrfs_space_info *found; |
| 707 | |
| 708 | rcu_read_lock(); |
| 709 | list_for_each_entry_rcu(found, head, list) |
| 710 | found->full = 0; |
| 711 | rcu_read_unlock(); |
| 712 | } |
| 713 | |
Filipe Manana | 1a4ed8f | 2014-10-27 10:44:24 +0000 | [diff] [blame] | 714 | /* simple helper to search for an existing data extent at a given offset */ |
| 715 | int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 716 | { |
| 717 | int ret; |
| 718 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 719 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 720 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 721 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 722 | if (!path) |
| 723 | return -ENOMEM; |
| 724 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 725 | key.objectid = start; |
| 726 | key.offset = len; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 727 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 728 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
| 729 | 0, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 730 | btrfs_free_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 731 | return ret; |
| 732 | } |
| 733 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 734 | /* |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 735 | * helper function to lookup reference count and flags of a tree block. |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 736 | * |
| 737 | * the head node for delayed ref is used to store the sum of all the |
| 738 | * reference count modifications queued up in the rbtree. the head |
| 739 | * node may also store the extent flags to set. This way you can check |
| 740 | * to see what the reference count and extent flags would be if all of |
| 741 | * the delayed refs are not processed. |
| 742 | */ |
| 743 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, |
| 744 | struct btrfs_root *root, u64 bytenr, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 745 | u64 offset, int metadata, u64 *refs, u64 *flags) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 746 | { |
| 747 | struct btrfs_delayed_ref_head *head; |
| 748 | struct btrfs_delayed_ref_root *delayed_refs; |
| 749 | struct btrfs_path *path; |
| 750 | struct btrfs_extent_item *ei; |
| 751 | struct extent_buffer *leaf; |
| 752 | struct btrfs_key key; |
| 753 | u32 item_size; |
| 754 | u64 num_refs; |
| 755 | u64 extent_flags; |
| 756 | int ret; |
| 757 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 758 | /* |
| 759 | * If we don't have skinny metadata, don't bother doing anything |
| 760 | * different |
| 761 | */ |
| 762 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 763 | offset = root->nodesize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 764 | metadata = 0; |
| 765 | } |
| 766 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 767 | path = btrfs_alloc_path(); |
| 768 | if (!path) |
| 769 | return -ENOMEM; |
| 770 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 771 | if (!trans) { |
| 772 | path->skip_locking = 1; |
| 773 | path->search_commit_root = 1; |
| 774 | } |
Filipe David Borba Manana | 639eefc | 2013-12-08 00:26:29 +0000 | [diff] [blame] | 775 | |
| 776 | search_again: |
| 777 | key.objectid = bytenr; |
| 778 | key.offset = offset; |
| 779 | if (metadata) |
| 780 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 781 | else |
| 782 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 783 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 784 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, |
| 785 | &key, path, 0, 0); |
| 786 | if (ret < 0) |
| 787 | goto out_free; |
| 788 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 789 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
Filipe David Borba Manana | 74be951 | 2013-07-05 23:12:06 +0100 | [diff] [blame] | 790 | if (path->slots[0]) { |
| 791 | path->slots[0]--; |
| 792 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 793 | path->slots[0]); |
| 794 | if (key.objectid == bytenr && |
| 795 | key.type == BTRFS_EXTENT_ITEM_KEY && |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 796 | key.offset == root->nodesize) |
Filipe David Borba Manana | 74be951 | 2013-07-05 23:12:06 +0100 | [diff] [blame] | 797 | ret = 0; |
| 798 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 799 | } |
| 800 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 801 | if (ret == 0) { |
| 802 | leaf = path->nodes[0]; |
| 803 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 804 | if (item_size >= sizeof(*ei)) { |
| 805 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 806 | struct btrfs_extent_item); |
| 807 | num_refs = btrfs_extent_refs(leaf, ei); |
| 808 | extent_flags = btrfs_extent_flags(leaf, ei); |
| 809 | } else { |
| 810 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 811 | struct btrfs_extent_item_v0 *ei0; |
| 812 | BUG_ON(item_size != sizeof(*ei0)); |
| 813 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 814 | struct btrfs_extent_item_v0); |
| 815 | num_refs = btrfs_extent_refs_v0(leaf, ei0); |
| 816 | /* FIXME: this isn't correct for data */ |
| 817 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 818 | #else |
| 819 | BUG(); |
| 820 | #endif |
| 821 | } |
| 822 | BUG_ON(num_refs == 0); |
| 823 | } else { |
| 824 | num_refs = 0; |
| 825 | extent_flags = 0; |
| 826 | ret = 0; |
| 827 | } |
| 828 | |
| 829 | if (!trans) |
| 830 | goto out; |
| 831 | |
| 832 | delayed_refs = &trans->transaction->delayed_refs; |
| 833 | spin_lock(&delayed_refs->lock); |
| 834 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 835 | if (head) { |
| 836 | if (!mutex_trylock(&head->mutex)) { |
| 837 | atomic_inc(&head->node.refs); |
| 838 | spin_unlock(&delayed_refs->lock); |
| 839 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 840 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 841 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 842 | /* |
| 843 | * Mutex was contended, block until it's released and try |
| 844 | * again |
| 845 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 846 | mutex_lock(&head->mutex); |
| 847 | mutex_unlock(&head->mutex); |
| 848 | btrfs_put_delayed_ref(&head->node); |
Filipe David Borba Manana | 639eefc | 2013-12-08 00:26:29 +0000 | [diff] [blame] | 849 | goto search_again; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 850 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 851 | spin_lock(&head->lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 852 | if (head->extent_op && head->extent_op->update_flags) |
| 853 | extent_flags |= head->extent_op->flags_to_set; |
| 854 | else |
| 855 | BUG_ON(num_refs == 0); |
| 856 | |
| 857 | num_refs += head->node.ref_mod; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 858 | spin_unlock(&head->lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 859 | mutex_unlock(&head->mutex); |
| 860 | } |
| 861 | spin_unlock(&delayed_refs->lock); |
| 862 | out: |
| 863 | WARN_ON(num_refs == 0); |
| 864 | if (refs) |
| 865 | *refs = num_refs; |
| 866 | if (flags) |
| 867 | *flags = extent_flags; |
| 868 | out_free: |
| 869 | btrfs_free_path(path); |
| 870 | return ret; |
| 871 | } |
| 872 | |
| 873 | /* |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 874 | * Back reference rules. Back refs have three main goals: |
| 875 | * |
| 876 | * 1) differentiate between all holders of references to an extent so that |
| 877 | * when a reference is dropped we can make sure it was a valid reference |
| 878 | * before freeing the extent. |
| 879 | * |
| 880 | * 2) Provide enough information to quickly find the holders of an extent |
| 881 | * if we notice a given block is corrupted or bad. |
| 882 | * |
| 883 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 884 | * maintenance. This is actually the same as #2, but with a slightly |
| 885 | * different use case. |
| 886 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 887 | * There are two kinds of back refs. The implicit back refs is optimized |
| 888 | * for pointers in non-shared tree blocks. For a given pointer in a block, |
| 889 | * back refs of this kind provide information about the block's owner tree |
| 890 | * and the pointer's key. These information allow us to find the block by |
| 891 | * b-tree searching. The full back refs is for pointers in tree blocks not |
| 892 | * referenced by their owner trees. The location of tree block is recorded |
| 893 | * in the back refs. Actually the full back refs is generic, and can be |
| 894 | * used in all cases the implicit back refs is used. The major shortcoming |
| 895 | * of the full back refs is its overhead. Every time a tree block gets |
| 896 | * COWed, we have to update back refs entry for all pointers in it. |
| 897 | * |
| 898 | * For a newly allocated tree block, we use implicit back refs for |
| 899 | * pointers in it. This means most tree related operations only involve |
| 900 | * implicit back refs. For a tree block created in old transaction, the |
| 901 | * only way to drop a reference to it is COW it. So we can detect the |
| 902 | * event that tree block loses its owner tree's reference and do the |
| 903 | * back refs conversion. |
| 904 | * |
| 905 | * When a tree block is COW'd through a tree, there are four cases: |
| 906 | * |
| 907 | * The reference count of the block is one and the tree is the block's |
| 908 | * owner tree. Nothing to do in this case. |
| 909 | * |
| 910 | * The reference count of the block is one and the tree is not the |
| 911 | * block's owner tree. In this case, full back refs is used for pointers |
| 912 | * in the block. Remove these full back refs, add implicit back refs for |
| 913 | * every pointers in the new block. |
| 914 | * |
| 915 | * The reference count of the block is greater than one and the tree is |
| 916 | * the block's owner tree. In this case, implicit back refs is used for |
| 917 | * pointers in the block. Add full back refs for every pointers in the |
| 918 | * block, increase lower level extents' reference counts. The original |
| 919 | * implicit back refs are entailed to the new block. |
| 920 | * |
| 921 | * The reference count of the block is greater than one and the tree is |
| 922 | * not the block's owner tree. Add implicit back refs for every pointer in |
| 923 | * the new block, increase lower level extents' reference count. |
| 924 | * |
| 925 | * Back Reference Key composing: |
| 926 | * |
| 927 | * The key objectid corresponds to the first byte in the extent, |
| 928 | * The key type is used to differentiate between types of back refs. |
| 929 | * There are different meanings of the key offset for different types |
| 930 | * of back refs. |
| 931 | * |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 932 | * File extents can be referenced by: |
| 933 | * |
| 934 | * - multiple snapshots, subvolumes, or different generations in one subvol |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 935 | * - different files inside a single subvolume |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 936 | * - different offsets inside a file (bookend extents in file.c) |
| 937 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 938 | * The extent ref structure for the implicit back refs has fields for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 939 | * |
| 940 | * - Objectid of the subvolume root |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 941 | * - objectid of the file holding the reference |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 942 | * - original offset in the file |
| 943 | * - how many bookend extents |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 944 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 945 | * The key offset for the implicit back refs is hash of the first |
| 946 | * three fields. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 947 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 948 | * The extent ref structure for the full back refs has field for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 949 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 950 | * - number of pointers in the tree leaf |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 951 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 952 | * The key offset for the implicit back refs is the first byte of |
| 953 | * the tree leaf |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 954 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 955 | * When a file extent is allocated, The implicit back refs is used. |
| 956 | * the fields are filled in: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 957 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 958 | * (root_key.objectid, inode objectid, offset in file, 1) |
| 959 | * |
| 960 | * When a file extent is removed file truncation, we find the |
| 961 | * corresponding implicit back refs and check the following fields: |
| 962 | * |
| 963 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 964 | * |
| 965 | * Btree extents can be referenced by: |
| 966 | * |
| 967 | * - Different subvolumes |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 968 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 969 | * Both the implicit back refs and the full back refs for tree blocks |
| 970 | * only consist of key. The key offset for the implicit back refs is |
| 971 | * objectid of block's owner tree. The key offset for the full back refs |
| 972 | * is the first byte of parent block. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 973 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 974 | * When implicit back refs is used, information about the lowest key and |
| 975 | * level of the tree block are required. These information are stored in |
| 976 | * tree block info structure. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 977 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 978 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 979 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 980 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, |
| 981 | struct btrfs_root *root, |
| 982 | struct btrfs_path *path, |
| 983 | u64 owner, u32 extra_size) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 984 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 985 | struct btrfs_extent_item *item; |
| 986 | struct btrfs_extent_item_v0 *ei0; |
| 987 | struct btrfs_extent_ref_v0 *ref0; |
| 988 | struct btrfs_tree_block_info *bi; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 989 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 990 | struct btrfs_key key; |
| 991 | struct btrfs_key found_key; |
| 992 | u32 new_size = sizeof(*item); |
| 993 | u64 refs; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 994 | int ret; |
| 995 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 996 | leaf = path->nodes[0]; |
| 997 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 998 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 999 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1000 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1001 | struct btrfs_extent_item_v0); |
| 1002 | refs = btrfs_extent_refs_v0(leaf, ei0); |
| 1003 | |
| 1004 | if (owner == (u64)-1) { |
| 1005 | while (1) { |
| 1006 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1007 | ret = btrfs_next_leaf(root, path); |
| 1008 | if (ret < 0) |
| 1009 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1010 | BUG_ON(ret > 0); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1011 | leaf = path->nodes[0]; |
| 1012 | } |
| 1013 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 1014 | path->slots[0]); |
| 1015 | BUG_ON(key.objectid != found_key.objectid); |
| 1016 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { |
| 1017 | path->slots[0]++; |
| 1018 | continue; |
| 1019 | } |
| 1020 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1021 | struct btrfs_extent_ref_v0); |
| 1022 | owner = btrfs_ref_objectid_v0(leaf, ref0); |
| 1023 | break; |
| 1024 | } |
| 1025 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1026 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1027 | |
| 1028 | if (owner < BTRFS_FIRST_FREE_OBJECTID) |
| 1029 | new_size += sizeof(*bi); |
| 1030 | |
| 1031 | new_size -= sizeof(*ei0); |
| 1032 | ret = btrfs_search_slot(trans, root, &key, path, |
| 1033 | new_size + extra_size, 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1034 | if (ret < 0) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1035 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1036 | BUG_ON(ret); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1037 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1038 | btrfs_extend_item(root, path, new_size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1039 | |
| 1040 | leaf = path->nodes[0]; |
| 1041 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1042 | btrfs_set_extent_refs(leaf, item, refs); |
| 1043 | /* FIXME: get real generation */ |
| 1044 | btrfs_set_extent_generation(leaf, item, 0); |
| 1045 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1046 | btrfs_set_extent_flags(leaf, item, |
| 1047 | BTRFS_EXTENT_FLAG_TREE_BLOCK | |
| 1048 | BTRFS_BLOCK_FLAG_FULL_BACKREF); |
| 1049 | bi = (struct btrfs_tree_block_info *)(item + 1); |
| 1050 | /* FIXME: get first key of the block */ |
| 1051 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); |
| 1052 | btrfs_set_tree_block_level(leaf, bi, (int)owner); |
| 1053 | } else { |
| 1054 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); |
| 1055 | } |
| 1056 | btrfs_mark_buffer_dirty(leaf); |
| 1057 | return 0; |
| 1058 | } |
| 1059 | #endif |
| 1060 | |
| 1061 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) |
| 1062 | { |
| 1063 | u32 high_crc = ~(u32)0; |
| 1064 | u32 low_crc = ~(u32)0; |
| 1065 | __le64 lenum; |
| 1066 | |
| 1067 | lenum = cpu_to_le64(root_objectid); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1068 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1069 | lenum = cpu_to_le64(owner); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1070 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1071 | lenum = cpu_to_le64(offset); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1072 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1073 | |
| 1074 | return ((u64)high_crc << 31) ^ (u64)low_crc; |
| 1075 | } |
| 1076 | |
| 1077 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, |
| 1078 | struct btrfs_extent_data_ref *ref) |
| 1079 | { |
| 1080 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), |
| 1081 | btrfs_extent_data_ref_objectid(leaf, ref), |
| 1082 | btrfs_extent_data_ref_offset(leaf, ref)); |
| 1083 | } |
| 1084 | |
| 1085 | static int match_extent_data_ref(struct extent_buffer *leaf, |
| 1086 | struct btrfs_extent_data_ref *ref, |
| 1087 | u64 root_objectid, u64 owner, u64 offset) |
| 1088 | { |
| 1089 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || |
| 1090 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || |
| 1091 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 1092 | return 0; |
| 1093 | return 1; |
| 1094 | } |
| 1095 | |
| 1096 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1097 | struct btrfs_root *root, |
| 1098 | struct btrfs_path *path, |
| 1099 | u64 bytenr, u64 parent, |
| 1100 | u64 root_objectid, |
| 1101 | u64 owner, u64 offset) |
| 1102 | { |
| 1103 | struct btrfs_key key; |
| 1104 | struct btrfs_extent_data_ref *ref; |
| 1105 | struct extent_buffer *leaf; |
| 1106 | u32 nritems; |
| 1107 | int ret; |
| 1108 | int recow; |
| 1109 | int err = -ENOENT; |
| 1110 | |
| 1111 | key.objectid = bytenr; |
| 1112 | if (parent) { |
| 1113 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1114 | key.offset = parent; |
| 1115 | } else { |
| 1116 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1117 | key.offset = hash_extent_data_ref(root_objectid, |
| 1118 | owner, offset); |
| 1119 | } |
| 1120 | again: |
| 1121 | recow = 0; |
| 1122 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1123 | if (ret < 0) { |
| 1124 | err = ret; |
| 1125 | goto fail; |
| 1126 | } |
| 1127 | |
| 1128 | if (parent) { |
| 1129 | if (!ret) |
| 1130 | return 0; |
| 1131 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1132 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1133 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1134 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1135 | if (ret < 0) { |
| 1136 | err = ret; |
| 1137 | goto fail; |
| 1138 | } |
| 1139 | if (!ret) |
| 1140 | return 0; |
| 1141 | #endif |
| 1142 | goto fail; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1143 | } |
| 1144 | |
| 1145 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1146 | nritems = btrfs_header_nritems(leaf); |
| 1147 | while (1) { |
| 1148 | if (path->slots[0] >= nritems) { |
| 1149 | ret = btrfs_next_leaf(root, path); |
| 1150 | if (ret < 0) |
| 1151 | err = ret; |
| 1152 | if (ret) |
| 1153 | goto fail; |
| 1154 | |
| 1155 | leaf = path->nodes[0]; |
| 1156 | nritems = btrfs_header_nritems(leaf); |
| 1157 | recow = 1; |
| 1158 | } |
| 1159 | |
| 1160 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1161 | if (key.objectid != bytenr || |
| 1162 | key.type != BTRFS_EXTENT_DATA_REF_KEY) |
| 1163 | goto fail; |
| 1164 | |
| 1165 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1166 | struct btrfs_extent_data_ref); |
| 1167 | |
| 1168 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1169 | owner, offset)) { |
| 1170 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1171 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1172 | goto again; |
| 1173 | } |
| 1174 | err = 0; |
| 1175 | break; |
| 1176 | } |
| 1177 | path->slots[0]++; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1178 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1179 | fail: |
| 1180 | return err; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1181 | } |
| 1182 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1183 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1184 | struct btrfs_root *root, |
| 1185 | struct btrfs_path *path, |
| 1186 | u64 bytenr, u64 parent, |
| 1187 | u64 root_objectid, u64 owner, |
| 1188 | u64 offset, int refs_to_add) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1189 | { |
| 1190 | struct btrfs_key key; |
| 1191 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1192 | u32 size; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1193 | u32 num_refs; |
| 1194 | int ret; |
| 1195 | |
| 1196 | key.objectid = bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1197 | if (parent) { |
| 1198 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1199 | key.offset = parent; |
| 1200 | size = sizeof(struct btrfs_shared_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1201 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1202 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1203 | key.offset = hash_extent_data_ref(root_objectid, |
| 1204 | owner, offset); |
| 1205 | size = sizeof(struct btrfs_extent_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1206 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1207 | |
| 1208 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
| 1209 | if (ret && ret != -EEXIST) |
| 1210 | goto fail; |
| 1211 | |
| 1212 | leaf = path->nodes[0]; |
| 1213 | if (parent) { |
| 1214 | struct btrfs_shared_data_ref *ref; |
| 1215 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1216 | struct btrfs_shared_data_ref); |
| 1217 | if (ret == 0) { |
| 1218 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); |
| 1219 | } else { |
| 1220 | num_refs = btrfs_shared_data_ref_count(leaf, ref); |
| 1221 | num_refs += refs_to_add; |
| 1222 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); |
| 1223 | } |
| 1224 | } else { |
| 1225 | struct btrfs_extent_data_ref *ref; |
| 1226 | while (ret == -EEXIST) { |
| 1227 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1228 | struct btrfs_extent_data_ref); |
| 1229 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1230 | owner, offset)) |
| 1231 | break; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1232 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1233 | key.offset++; |
| 1234 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 1235 | size); |
| 1236 | if (ret && ret != -EEXIST) |
| 1237 | goto fail; |
| 1238 | |
| 1239 | leaf = path->nodes[0]; |
| 1240 | } |
| 1241 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1242 | struct btrfs_extent_data_ref); |
| 1243 | if (ret == 0) { |
| 1244 | btrfs_set_extent_data_ref_root(leaf, ref, |
| 1245 | root_objectid); |
| 1246 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 1247 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 1248 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); |
| 1249 | } else { |
| 1250 | num_refs = btrfs_extent_data_ref_count(leaf, ref); |
| 1251 | num_refs += refs_to_add; |
| 1252 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); |
| 1253 | } |
| 1254 | } |
| 1255 | btrfs_mark_buffer_dirty(leaf); |
| 1256 | ret = 0; |
| 1257 | fail: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1258 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1259 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1260 | } |
| 1261 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1262 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1263 | struct btrfs_root *root, |
| 1264 | struct btrfs_path *path, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1265 | int refs_to_drop, int *last_ref) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1266 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1267 | struct btrfs_key key; |
| 1268 | struct btrfs_extent_data_ref *ref1 = NULL; |
| 1269 | struct btrfs_shared_data_ref *ref2 = NULL; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1270 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1271 | u32 num_refs = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1272 | int ret = 0; |
| 1273 | |
| 1274 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1275 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1276 | |
| 1277 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1278 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1279 | struct btrfs_extent_data_ref); |
| 1280 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1281 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1282 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1283 | struct btrfs_shared_data_ref); |
| 1284 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1285 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1286 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1287 | struct btrfs_extent_ref_v0 *ref0; |
| 1288 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1289 | struct btrfs_extent_ref_v0); |
| 1290 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1291 | #endif |
| 1292 | } else { |
| 1293 | BUG(); |
| 1294 | } |
| 1295 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1296 | BUG_ON(num_refs < refs_to_drop); |
| 1297 | num_refs -= refs_to_drop; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1298 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1299 | if (num_refs == 0) { |
| 1300 | ret = btrfs_del_item(trans, root, path); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1301 | *last_ref = 1; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1302 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1303 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1304 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); |
| 1305 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) |
| 1306 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); |
| 1307 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1308 | else { |
| 1309 | struct btrfs_extent_ref_v0 *ref0; |
| 1310 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1311 | struct btrfs_extent_ref_v0); |
| 1312 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); |
| 1313 | } |
| 1314 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1315 | btrfs_mark_buffer_dirty(leaf); |
| 1316 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1317 | return ret; |
| 1318 | } |
| 1319 | |
| 1320 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
| 1321 | struct btrfs_path *path, |
| 1322 | struct btrfs_extent_inline_ref *iref) |
| 1323 | { |
| 1324 | struct btrfs_key key; |
| 1325 | struct extent_buffer *leaf; |
| 1326 | struct btrfs_extent_data_ref *ref1; |
| 1327 | struct btrfs_shared_data_ref *ref2; |
| 1328 | u32 num_refs = 0; |
| 1329 | |
| 1330 | leaf = path->nodes[0]; |
| 1331 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1332 | if (iref) { |
| 1333 | if (btrfs_extent_inline_ref_type(leaf, iref) == |
| 1334 | BTRFS_EXTENT_DATA_REF_KEY) { |
| 1335 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1336 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1337 | } else { |
| 1338 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1339 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1340 | } |
| 1341 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1342 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1343 | struct btrfs_extent_data_ref); |
| 1344 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1345 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1346 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1347 | struct btrfs_shared_data_ref); |
| 1348 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1349 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1350 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1351 | struct btrfs_extent_ref_v0 *ref0; |
| 1352 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1353 | struct btrfs_extent_ref_v0); |
| 1354 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1355 | #endif |
| 1356 | } else { |
| 1357 | WARN_ON(1); |
| 1358 | } |
| 1359 | return num_refs; |
| 1360 | } |
| 1361 | |
| 1362 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1363 | struct btrfs_root *root, |
| 1364 | struct btrfs_path *path, |
| 1365 | u64 bytenr, u64 parent, |
| 1366 | u64 root_objectid) |
| 1367 | { |
| 1368 | struct btrfs_key key; |
| 1369 | int ret; |
| 1370 | |
| 1371 | key.objectid = bytenr; |
| 1372 | if (parent) { |
| 1373 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1374 | key.offset = parent; |
| 1375 | } else { |
| 1376 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1377 | key.offset = root_objectid; |
| 1378 | } |
| 1379 | |
| 1380 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1381 | if (ret > 0) |
| 1382 | ret = -ENOENT; |
| 1383 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1384 | if (ret == -ENOENT && parent) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1385 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1386 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
| 1387 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1388 | if (ret > 0) |
| 1389 | ret = -ENOENT; |
| 1390 | } |
| 1391 | #endif |
| 1392 | return ret; |
| 1393 | } |
| 1394 | |
| 1395 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1396 | struct btrfs_root *root, |
| 1397 | struct btrfs_path *path, |
| 1398 | u64 bytenr, u64 parent, |
| 1399 | u64 root_objectid) |
| 1400 | { |
| 1401 | struct btrfs_key key; |
| 1402 | int ret; |
| 1403 | |
| 1404 | key.objectid = bytenr; |
| 1405 | if (parent) { |
| 1406 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1407 | key.offset = parent; |
| 1408 | } else { |
| 1409 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1410 | key.offset = root_objectid; |
| 1411 | } |
| 1412 | |
| 1413 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1414 | btrfs_release_path(path); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1415 | return ret; |
| 1416 | } |
| 1417 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1418 | static inline int extent_ref_type(u64 parent, u64 owner) |
| 1419 | { |
| 1420 | int type; |
| 1421 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1422 | if (parent > 0) |
| 1423 | type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1424 | else |
| 1425 | type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1426 | } else { |
| 1427 | if (parent > 0) |
| 1428 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 1429 | else |
| 1430 | type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1431 | } |
| 1432 | return type; |
| 1433 | } |
| 1434 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1435 | static int find_next_key(struct btrfs_path *path, int level, |
| 1436 | struct btrfs_key *key) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1437 | |
| 1438 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1439 | for (; level < BTRFS_MAX_LEVEL; level++) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1440 | if (!path->nodes[level]) |
| 1441 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1442 | if (path->slots[level] + 1 >= |
| 1443 | btrfs_header_nritems(path->nodes[level])) |
| 1444 | continue; |
| 1445 | if (level == 0) |
| 1446 | btrfs_item_key_to_cpu(path->nodes[level], key, |
| 1447 | path->slots[level] + 1); |
| 1448 | else |
| 1449 | btrfs_node_key_to_cpu(path->nodes[level], key, |
| 1450 | path->slots[level] + 1); |
| 1451 | return 0; |
| 1452 | } |
| 1453 | return 1; |
| 1454 | } |
| 1455 | |
| 1456 | /* |
| 1457 | * look for inline back ref. if back ref is found, *ref_ret is set |
| 1458 | * to the address of inline back ref, and 0 is returned. |
| 1459 | * |
| 1460 | * if back ref isn't found, *ref_ret is set to the address where it |
| 1461 | * should be inserted, and -ENOENT is returned. |
| 1462 | * |
| 1463 | * if insert is true and there are too many inline back refs, the path |
| 1464 | * points to the extent item, and -EAGAIN is returned. |
| 1465 | * |
| 1466 | * NOTE: inline back refs are ordered in the same way that back ref |
| 1467 | * items in the tree are ordered. |
| 1468 | */ |
| 1469 | static noinline_for_stack |
| 1470 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1471 | struct btrfs_root *root, |
| 1472 | struct btrfs_path *path, |
| 1473 | struct btrfs_extent_inline_ref **ref_ret, |
| 1474 | u64 bytenr, u64 num_bytes, |
| 1475 | u64 parent, u64 root_objectid, |
| 1476 | u64 owner, u64 offset, int insert) |
| 1477 | { |
| 1478 | struct btrfs_key key; |
| 1479 | struct extent_buffer *leaf; |
| 1480 | struct btrfs_extent_item *ei; |
| 1481 | struct btrfs_extent_inline_ref *iref; |
| 1482 | u64 flags; |
| 1483 | u64 item_size; |
| 1484 | unsigned long ptr; |
| 1485 | unsigned long end; |
| 1486 | int extra_size; |
| 1487 | int type; |
| 1488 | int want; |
| 1489 | int ret; |
| 1490 | int err = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1491 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 1492 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1493 | |
| 1494 | key.objectid = bytenr; |
| 1495 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1496 | key.offset = num_bytes; |
| 1497 | |
| 1498 | want = extent_ref_type(parent, owner); |
| 1499 | if (insert) { |
| 1500 | extra_size = btrfs_extent_inline_ref_size(want); |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1501 | path->keep_locks = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1502 | } else |
| 1503 | extra_size = -1; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1504 | |
| 1505 | /* |
| 1506 | * Owner is our parent level, so we can just add one to get the level |
| 1507 | * for the block we are interested in. |
| 1508 | */ |
| 1509 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1510 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 1511 | key.offset = owner; |
| 1512 | } |
| 1513 | |
| 1514 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1515 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
| 1516 | if (ret < 0) { |
| 1517 | err = ret; |
| 1518 | goto out; |
| 1519 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1520 | |
| 1521 | /* |
| 1522 | * We may be a newly converted file system which still has the old fat |
| 1523 | * extent entries for metadata, so try and see if we have one of those. |
| 1524 | */ |
| 1525 | if (ret > 0 && skinny_metadata) { |
| 1526 | skinny_metadata = false; |
| 1527 | if (path->slots[0]) { |
| 1528 | path->slots[0]--; |
| 1529 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 1530 | path->slots[0]); |
| 1531 | if (key.objectid == bytenr && |
| 1532 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 1533 | key.offset == num_bytes) |
| 1534 | ret = 0; |
| 1535 | } |
| 1536 | if (ret) { |
Filipe Manana | 9ce49a0 | 2014-04-24 15:15:28 +0100 | [diff] [blame] | 1537 | key.objectid = bytenr; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1538 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1539 | key.offset = num_bytes; |
| 1540 | btrfs_release_path(path); |
| 1541 | goto again; |
| 1542 | } |
| 1543 | } |
| 1544 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1545 | if (ret && !insert) { |
| 1546 | err = -ENOENT; |
| 1547 | goto out; |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 1548 | } else if (WARN_ON(ret)) { |
Josef Bacik | 492104c | 2013-03-08 15:41:02 -0500 | [diff] [blame] | 1549 | err = -EIO; |
Josef Bacik | 492104c | 2013-03-08 15:41:02 -0500 | [diff] [blame] | 1550 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1551 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1552 | |
| 1553 | leaf = path->nodes[0]; |
| 1554 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1555 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1556 | if (item_size < sizeof(*ei)) { |
| 1557 | if (!insert) { |
| 1558 | err = -ENOENT; |
| 1559 | goto out; |
| 1560 | } |
| 1561 | ret = convert_extent_item_v0(trans, root, path, owner, |
| 1562 | extra_size); |
| 1563 | if (ret < 0) { |
| 1564 | err = ret; |
| 1565 | goto out; |
| 1566 | } |
| 1567 | leaf = path->nodes[0]; |
| 1568 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1569 | } |
| 1570 | #endif |
| 1571 | BUG_ON(item_size < sizeof(*ei)); |
| 1572 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1573 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1574 | flags = btrfs_extent_flags(leaf, ei); |
| 1575 | |
| 1576 | ptr = (unsigned long)(ei + 1); |
| 1577 | end = (unsigned long)ei + item_size; |
| 1578 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1579 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1580 | ptr += sizeof(struct btrfs_tree_block_info); |
| 1581 | BUG_ON(ptr > end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | err = -ENOENT; |
| 1585 | while (1) { |
| 1586 | if (ptr >= end) { |
| 1587 | WARN_ON(ptr > end); |
| 1588 | break; |
| 1589 | } |
| 1590 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1591 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1592 | if (want < type) |
| 1593 | break; |
| 1594 | if (want > type) { |
| 1595 | ptr += btrfs_extent_inline_ref_size(type); |
| 1596 | continue; |
| 1597 | } |
| 1598 | |
| 1599 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1600 | struct btrfs_extent_data_ref *dref; |
| 1601 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1602 | if (match_extent_data_ref(leaf, dref, root_objectid, |
| 1603 | owner, offset)) { |
| 1604 | err = 0; |
| 1605 | break; |
| 1606 | } |
| 1607 | if (hash_extent_data_ref_item(leaf, dref) < |
| 1608 | hash_extent_data_ref(root_objectid, owner, offset)) |
| 1609 | break; |
| 1610 | } else { |
| 1611 | u64 ref_offset; |
| 1612 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); |
| 1613 | if (parent > 0) { |
| 1614 | if (parent == ref_offset) { |
| 1615 | err = 0; |
| 1616 | break; |
| 1617 | } |
| 1618 | if (ref_offset < parent) |
| 1619 | break; |
| 1620 | } else { |
| 1621 | if (root_objectid == ref_offset) { |
| 1622 | err = 0; |
| 1623 | break; |
| 1624 | } |
| 1625 | if (ref_offset < root_objectid) |
| 1626 | break; |
| 1627 | } |
| 1628 | } |
| 1629 | ptr += btrfs_extent_inline_ref_size(type); |
| 1630 | } |
| 1631 | if (err == -ENOENT && insert) { |
| 1632 | if (item_size + extra_size >= |
| 1633 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { |
| 1634 | err = -EAGAIN; |
| 1635 | goto out; |
| 1636 | } |
| 1637 | /* |
| 1638 | * To add new inline back ref, we have to make sure |
| 1639 | * there is no corresponding back ref item. |
| 1640 | * For simplicity, we just do not add new inline back |
| 1641 | * ref if there is any kind of item for this block |
| 1642 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1643 | if (find_next_key(path, 0, &key) == 0 && |
| 1644 | key.objectid == bytenr && |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1645 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1646 | err = -EAGAIN; |
| 1647 | goto out; |
| 1648 | } |
| 1649 | } |
| 1650 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; |
| 1651 | out: |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1652 | if (insert) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1653 | path->keep_locks = 0; |
| 1654 | btrfs_unlock_up_safe(path, 1); |
| 1655 | } |
| 1656 | return err; |
| 1657 | } |
| 1658 | |
| 1659 | /* |
| 1660 | * helper to add new inline back ref |
| 1661 | */ |
| 1662 | static noinline_for_stack |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1663 | void setup_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1664 | struct btrfs_path *path, |
| 1665 | struct btrfs_extent_inline_ref *iref, |
| 1666 | u64 parent, u64 root_objectid, |
| 1667 | u64 owner, u64 offset, int refs_to_add, |
| 1668 | struct btrfs_delayed_extent_op *extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1669 | { |
| 1670 | struct extent_buffer *leaf; |
| 1671 | struct btrfs_extent_item *ei; |
| 1672 | unsigned long ptr; |
| 1673 | unsigned long end; |
| 1674 | unsigned long item_offset; |
| 1675 | u64 refs; |
| 1676 | int size; |
| 1677 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1678 | |
| 1679 | leaf = path->nodes[0]; |
| 1680 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1681 | item_offset = (unsigned long)iref - (unsigned long)ei; |
| 1682 | |
| 1683 | type = extent_ref_type(parent, owner); |
| 1684 | size = btrfs_extent_inline_ref_size(type); |
| 1685 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1686 | btrfs_extend_item(root, path, size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1687 | |
| 1688 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1689 | refs = btrfs_extent_refs(leaf, ei); |
| 1690 | refs += refs_to_add; |
| 1691 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1692 | if (extent_op) |
| 1693 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1694 | |
| 1695 | ptr = (unsigned long)ei + item_offset; |
| 1696 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); |
| 1697 | if (ptr < end - size) |
| 1698 | memmove_extent_buffer(leaf, ptr + size, ptr, |
| 1699 | end - size - ptr); |
| 1700 | |
| 1701 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1702 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 1703 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1704 | struct btrfs_extent_data_ref *dref; |
| 1705 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1706 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); |
| 1707 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); |
| 1708 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); |
| 1709 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); |
| 1710 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1711 | struct btrfs_shared_data_ref *sref; |
| 1712 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1713 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); |
| 1714 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1715 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| 1716 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1717 | } else { |
| 1718 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 1719 | } |
| 1720 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1721 | } |
| 1722 | |
| 1723 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, |
| 1724 | struct btrfs_root *root, |
| 1725 | struct btrfs_path *path, |
| 1726 | struct btrfs_extent_inline_ref **ref_ret, |
| 1727 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1728 | u64 root_objectid, u64 owner, u64 offset) |
| 1729 | { |
| 1730 | int ret; |
| 1731 | |
| 1732 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, |
| 1733 | bytenr, num_bytes, parent, |
| 1734 | root_objectid, owner, offset, 0); |
| 1735 | if (ret != -ENOENT) |
| 1736 | return ret; |
| 1737 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1738 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1739 | *ref_ret = NULL; |
| 1740 | |
| 1741 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1742 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, |
| 1743 | root_objectid); |
| 1744 | } else { |
| 1745 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, |
| 1746 | root_objectid, owner, offset); |
| 1747 | } |
| 1748 | return ret; |
| 1749 | } |
| 1750 | |
| 1751 | /* |
| 1752 | * helper to update/remove inline back ref |
| 1753 | */ |
| 1754 | static noinline_for_stack |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1755 | void update_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1756 | struct btrfs_path *path, |
| 1757 | struct btrfs_extent_inline_ref *iref, |
| 1758 | int refs_to_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1759 | struct btrfs_delayed_extent_op *extent_op, |
| 1760 | int *last_ref) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1761 | { |
| 1762 | struct extent_buffer *leaf; |
| 1763 | struct btrfs_extent_item *ei; |
| 1764 | struct btrfs_extent_data_ref *dref = NULL; |
| 1765 | struct btrfs_shared_data_ref *sref = NULL; |
| 1766 | unsigned long ptr; |
| 1767 | unsigned long end; |
| 1768 | u32 item_size; |
| 1769 | int size; |
| 1770 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1771 | u64 refs; |
| 1772 | |
| 1773 | leaf = path->nodes[0]; |
| 1774 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1775 | refs = btrfs_extent_refs(leaf, ei); |
| 1776 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); |
| 1777 | refs += refs_to_mod; |
| 1778 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1779 | if (extent_op) |
| 1780 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1781 | |
| 1782 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1783 | |
| 1784 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1785 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1786 | refs = btrfs_extent_data_ref_count(leaf, dref); |
| 1787 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1788 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1789 | refs = btrfs_shared_data_ref_count(leaf, sref); |
| 1790 | } else { |
| 1791 | refs = 1; |
| 1792 | BUG_ON(refs_to_mod != -1); |
| 1793 | } |
| 1794 | |
| 1795 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
| 1796 | refs += refs_to_mod; |
| 1797 | |
| 1798 | if (refs > 0) { |
| 1799 | if (type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1800 | btrfs_set_extent_data_ref_count(leaf, dref, refs); |
| 1801 | else |
| 1802 | btrfs_set_shared_data_ref_count(leaf, sref, refs); |
| 1803 | } else { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1804 | *last_ref = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1805 | size = btrfs_extent_inline_ref_size(type); |
| 1806 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1807 | ptr = (unsigned long)iref; |
| 1808 | end = (unsigned long)ei + item_size; |
| 1809 | if (ptr + size < end) |
| 1810 | memmove_extent_buffer(leaf, ptr, ptr + size, |
| 1811 | end - ptr - size); |
| 1812 | item_size -= size; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1813 | btrfs_truncate_item(root, path, item_size, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1814 | } |
| 1815 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1816 | } |
| 1817 | |
| 1818 | static noinline_for_stack |
| 1819 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1820 | struct btrfs_root *root, |
| 1821 | struct btrfs_path *path, |
| 1822 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1823 | u64 root_objectid, u64 owner, |
| 1824 | u64 offset, int refs_to_add, |
| 1825 | struct btrfs_delayed_extent_op *extent_op) |
| 1826 | { |
| 1827 | struct btrfs_extent_inline_ref *iref; |
| 1828 | int ret; |
| 1829 | |
| 1830 | ret = lookup_inline_extent_backref(trans, root, path, &iref, |
| 1831 | bytenr, num_bytes, parent, |
| 1832 | root_objectid, owner, offset, 1); |
| 1833 | if (ret == 0) { |
| 1834 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1835 | update_inline_extent_backref(root, path, iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1836 | refs_to_add, extent_op, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1837 | } else if (ret == -ENOENT) { |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1838 | setup_inline_extent_backref(root, path, iref, parent, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1839 | root_objectid, owner, offset, |
| 1840 | refs_to_add, extent_op); |
| 1841 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1842 | } |
| 1843 | return ret; |
| 1844 | } |
| 1845 | |
| 1846 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
| 1847 | struct btrfs_root *root, |
| 1848 | struct btrfs_path *path, |
| 1849 | u64 bytenr, u64 parent, u64 root_objectid, |
| 1850 | u64 owner, u64 offset, int refs_to_add) |
| 1851 | { |
| 1852 | int ret; |
| 1853 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1854 | BUG_ON(refs_to_add != 1); |
| 1855 | ret = insert_tree_block_ref(trans, root, path, bytenr, |
| 1856 | parent, root_objectid); |
| 1857 | } else { |
| 1858 | ret = insert_extent_data_ref(trans, root, path, bytenr, |
| 1859 | parent, root_objectid, |
| 1860 | owner, offset, refs_to_add); |
| 1861 | } |
| 1862 | return ret; |
| 1863 | } |
| 1864 | |
| 1865 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
| 1866 | struct btrfs_root *root, |
| 1867 | struct btrfs_path *path, |
| 1868 | struct btrfs_extent_inline_ref *iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1869 | int refs_to_drop, int is_data, int *last_ref) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1870 | { |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1871 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1872 | |
| 1873 | BUG_ON(!is_data && refs_to_drop != 1); |
| 1874 | if (iref) { |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1875 | update_inline_extent_backref(root, path, iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1876 | -refs_to_drop, NULL, last_ref); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1877 | } else if (is_data) { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1878 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop, |
| 1879 | last_ref); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1880 | } else { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1881 | *last_ref = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1882 | ret = btrfs_del_item(trans, root, path); |
| 1883 | } |
| 1884 | return ret; |
| 1885 | } |
| 1886 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1887 | static int btrfs_issue_discard(struct block_device *bdev, |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1888 | u64 start, u64 len) |
| 1889 | { |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1890 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1891 | } |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1892 | |
Filipe Manana | 1edb647b | 2014-12-08 14:01:12 +0000 | [diff] [blame] | 1893 | int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
| 1894 | u64 num_bytes, u64 *actual_bytes) |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1895 | { |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1896 | int ret; |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1897 | u64 discarded_bytes = 0; |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1898 | struct btrfs_bio *bbio = NULL; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1899 | |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 1900 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1901 | /* Tell the block device(s) that the sectors can be discarded */ |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 1902 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1903 | bytenr, &num_bytes, &bbio, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1904 | /* Error condition is -ENOMEM */ |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1905 | if (!ret) { |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1906 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1907 | int i; |
| 1908 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1909 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1910 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
Josef Bacik | d5e2003 | 2011-08-04 14:52:27 +0000 | [diff] [blame] | 1911 | if (!stripe->dev->can_discard) |
| 1912 | continue; |
| 1913 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1914 | ret = btrfs_issue_discard(stripe->dev->bdev, |
| 1915 | stripe->physical, |
| 1916 | stripe->length); |
| 1917 | if (!ret) |
| 1918 | discarded_bytes += stripe->length; |
| 1919 | else if (ret != -EOPNOTSUPP) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1920 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
Josef Bacik | d5e2003 | 2011-08-04 14:52:27 +0000 | [diff] [blame] | 1921 | |
| 1922 | /* |
| 1923 | * Just in case we get back EOPNOTSUPP for some reason, |
| 1924 | * just ignore the return value so we don't screw up |
| 1925 | * people calling discard_extent. |
| 1926 | */ |
| 1927 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1928 | } |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 1929 | btrfs_put_bbio(bbio); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1930 | } |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1931 | |
| 1932 | if (actual_bytes) |
| 1933 | *actual_bytes = discarded_bytes; |
| 1934 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1935 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1936 | if (ret == -EOPNOTSUPP) |
| 1937 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1938 | return ret; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1939 | } |
| 1940 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1941 | /* Can return -ENOMEM */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1942 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
| 1943 | struct btrfs_root *root, |
| 1944 | u64 bytenr, u64 num_bytes, u64 parent, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1945 | u64 root_objectid, u64 owner, u64 offset, |
| 1946 | int no_quota) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1947 | { |
| 1948 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1949 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1950 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1951 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
| 1952 | root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1953 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1954 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1955 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 1956 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1957 | parent, root_objectid, (int)owner, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1958 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1959 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1960 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 1961 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1962 | parent, root_objectid, owner, offset, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1963 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1964 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1965 | return ret; |
| 1966 | } |
| 1967 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1968 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1969 | struct btrfs_root *root, |
| 1970 | u64 bytenr, u64 num_bytes, |
| 1971 | u64 parent, u64 root_objectid, |
| 1972 | u64 owner, u64 offset, int refs_to_add, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1973 | int no_quota, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1974 | struct btrfs_delayed_extent_op *extent_op) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1975 | { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1976 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1977 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1978 | struct extent_buffer *leaf; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1979 | struct btrfs_extent_item *item; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1980 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1981 | u64 refs; |
| 1982 | int ret; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1983 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_ADD_EXCL; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1984 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1985 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1986 | if (!path) |
| 1987 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1988 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1989 | if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled) |
| 1990 | no_quota = 1; |
| 1991 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1992 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1993 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1994 | /* this will setup the path even if it fails to insert the back ref */ |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1995 | ret = insert_inline_extent_backref(trans, fs_info->extent_root, path, |
| 1996 | bytenr, num_bytes, parent, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1997 | root_objectid, owner, offset, |
| 1998 | refs_to_add, extent_op); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1999 | if ((ret < 0 && ret != -EAGAIN) || (!ret && no_quota)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2000 | goto out; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2001 | /* |
| 2002 | * Ok we were able to insert an inline extent and it appears to be a new |
| 2003 | * reference, deal with the qgroup accounting. |
| 2004 | */ |
| 2005 | if (!ret && !no_quota) { |
| 2006 | ASSERT(root->fs_info->quota_enabled); |
| 2007 | leaf = path->nodes[0]; |
| 2008 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 2009 | item = btrfs_item_ptr(leaf, path->slots[0], |
| 2010 | struct btrfs_extent_item); |
| 2011 | if (btrfs_extent_refs(leaf, item) > (u64)refs_to_add) |
| 2012 | type = BTRFS_QGROUP_OPER_ADD_SHARED; |
| 2013 | btrfs_release_path(path); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2014 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2015 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 2016 | bytenr, num_bytes, type, 0); |
| 2017 | goto out; |
| 2018 | } |
| 2019 | |
| 2020 | /* |
| 2021 | * Ok we had -EAGAIN which means we didn't have space to insert and |
| 2022 | * inline extent ref, so just update the reference count and add a |
| 2023 | * normal backref. |
| 2024 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2025 | leaf = path->nodes[0]; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2026 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2027 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2028 | refs = btrfs_extent_refs(leaf, item); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2029 | if (refs) |
| 2030 | type = BTRFS_QGROUP_OPER_ADD_SHARED; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2031 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); |
| 2032 | if (extent_op) |
| 2033 | __run_delayed_extent_op(extent_op, leaf, item); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2034 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2035 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2036 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2037 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2038 | if (!no_quota) { |
| 2039 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 2040 | bytenr, num_bytes, type, 0); |
| 2041 | if (ret) |
| 2042 | goto out; |
| 2043 | } |
| 2044 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2045 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2046 | path->leave_spinning = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2047 | /* now insert the actual backref */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2048 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2049 | path, bytenr, parent, root_objectid, |
| 2050 | owner, offset, refs_to_add); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2051 | if (ret) |
| 2052 | btrfs_abort_transaction(trans, root, ret); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2053 | out: |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2054 | btrfs_free_path(path); |
Liu Bo | 30d133f | 2013-10-11 16:30:23 +0800 | [diff] [blame] | 2055 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 2056 | } |
| 2057 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2058 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
| 2059 | struct btrfs_root *root, |
| 2060 | struct btrfs_delayed_ref_node *node, |
| 2061 | struct btrfs_delayed_extent_op *extent_op, |
| 2062 | int insert_reserved) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2063 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2064 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2065 | struct btrfs_delayed_data_ref *ref; |
| 2066 | struct btrfs_key ins; |
| 2067 | u64 parent = 0; |
| 2068 | u64 ref_root = 0; |
| 2069 | u64 flags = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2070 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2071 | ins.objectid = node->bytenr; |
| 2072 | ins.offset = node->num_bytes; |
| 2073 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2074 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2075 | ref = btrfs_delayed_node_to_data_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2076 | trace_run_delayed_data_ref(node, ref, node->action); |
| 2077 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2078 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2079 | parent = ref->parent; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2080 | ref_root = ref->root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2081 | |
| 2082 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2083 | if (extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2084 | flags |= extent_op->flags_to_set; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2085 | ret = alloc_reserved_file_extent(trans, root, |
| 2086 | parent, ref_root, flags, |
| 2087 | ref->objectid, ref->offset, |
| 2088 | &ins, node->ref_mod); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2089 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2090 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2091 | node->num_bytes, parent, |
| 2092 | ref_root, ref->objectid, |
| 2093 | ref->offset, node->ref_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2094 | node->no_quota, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2095 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2096 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2097 | node->num_bytes, parent, |
| 2098 | ref_root, ref->objectid, |
| 2099 | ref->offset, node->ref_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2100 | extent_op, node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2101 | } else { |
| 2102 | BUG(); |
| 2103 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2104 | return ret; |
| 2105 | } |
| 2106 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2107 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 2108 | struct extent_buffer *leaf, |
| 2109 | struct btrfs_extent_item *ei) |
| 2110 | { |
| 2111 | u64 flags = btrfs_extent_flags(leaf, ei); |
| 2112 | if (extent_op->update_flags) { |
| 2113 | flags |= extent_op->flags_to_set; |
| 2114 | btrfs_set_extent_flags(leaf, ei, flags); |
| 2115 | } |
| 2116 | |
| 2117 | if (extent_op->update_key) { |
| 2118 | struct btrfs_tree_block_info *bi; |
| 2119 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); |
| 2120 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 2121 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); |
| 2122 | } |
| 2123 | } |
| 2124 | |
| 2125 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, |
| 2126 | struct btrfs_root *root, |
| 2127 | struct btrfs_delayed_ref_node *node, |
| 2128 | struct btrfs_delayed_extent_op *extent_op) |
| 2129 | { |
| 2130 | struct btrfs_key key; |
| 2131 | struct btrfs_path *path; |
| 2132 | struct btrfs_extent_item *ei; |
| 2133 | struct extent_buffer *leaf; |
| 2134 | u32 item_size; |
| 2135 | int ret; |
| 2136 | int err = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2137 | int metadata = !extent_op->is_data; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2138 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2139 | if (trans->aborted) |
| 2140 | return 0; |
| 2141 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2142 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2143 | metadata = 0; |
| 2144 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2145 | path = btrfs_alloc_path(); |
| 2146 | if (!path) |
| 2147 | return -ENOMEM; |
| 2148 | |
| 2149 | key.objectid = node->bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2150 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2151 | if (metadata) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2152 | key.type = BTRFS_METADATA_ITEM_KEY; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2153 | key.offset = extent_op->level; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2154 | } else { |
| 2155 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2156 | key.offset = node->num_bytes; |
| 2157 | } |
| 2158 | |
| 2159 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2160 | path->reada = 1; |
| 2161 | path->leave_spinning = 1; |
| 2162 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, |
| 2163 | path, 0, 1); |
| 2164 | if (ret < 0) { |
| 2165 | err = ret; |
| 2166 | goto out; |
| 2167 | } |
| 2168 | if (ret > 0) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2169 | if (metadata) { |
Filipe David Borba Manana | 5599488 | 2013-10-18 15:42:56 +0100 | [diff] [blame] | 2170 | if (path->slots[0] > 0) { |
| 2171 | path->slots[0]--; |
| 2172 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 2173 | path->slots[0]); |
| 2174 | if (key.objectid == node->bytenr && |
| 2175 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 2176 | key.offset == node->num_bytes) |
| 2177 | ret = 0; |
| 2178 | } |
| 2179 | if (ret > 0) { |
| 2180 | btrfs_release_path(path); |
| 2181 | metadata = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2182 | |
Filipe David Borba Manana | 5599488 | 2013-10-18 15:42:56 +0100 | [diff] [blame] | 2183 | key.objectid = node->bytenr; |
| 2184 | key.offset = node->num_bytes; |
| 2185 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2186 | goto again; |
| 2187 | } |
| 2188 | } else { |
| 2189 | err = -EIO; |
| 2190 | goto out; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2191 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2192 | } |
| 2193 | |
| 2194 | leaf = path->nodes[0]; |
| 2195 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2196 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 2197 | if (item_size < sizeof(*ei)) { |
| 2198 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, |
| 2199 | path, (u64)-1, 0); |
| 2200 | if (ret < 0) { |
| 2201 | err = ret; |
| 2202 | goto out; |
| 2203 | } |
| 2204 | leaf = path->nodes[0]; |
| 2205 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2206 | } |
| 2207 | #endif |
| 2208 | BUG_ON(item_size < sizeof(*ei)); |
| 2209 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2210 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 2211 | |
| 2212 | btrfs_mark_buffer_dirty(leaf); |
| 2213 | out: |
| 2214 | btrfs_free_path(path); |
| 2215 | return err; |
| 2216 | } |
| 2217 | |
| 2218 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
| 2219 | struct btrfs_root *root, |
| 2220 | struct btrfs_delayed_ref_node *node, |
| 2221 | struct btrfs_delayed_extent_op *extent_op, |
| 2222 | int insert_reserved) |
| 2223 | { |
| 2224 | int ret = 0; |
| 2225 | struct btrfs_delayed_tree_ref *ref; |
| 2226 | struct btrfs_key ins; |
| 2227 | u64 parent = 0; |
| 2228 | u64 ref_root = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2229 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 2230 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2231 | |
| 2232 | ref = btrfs_delayed_node_to_tree_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2233 | trace_run_delayed_tree_ref(node, ref, node->action); |
| 2234 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2235 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2236 | parent = ref->parent; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2237 | ref_root = ref->root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2238 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2239 | ins.objectid = node->bytenr; |
| 2240 | if (skinny_metadata) { |
| 2241 | ins.offset = ref->level; |
| 2242 | ins.type = BTRFS_METADATA_ITEM_KEY; |
| 2243 | } else { |
| 2244 | ins.offset = node->num_bytes; |
| 2245 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
| 2246 | } |
| 2247 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2248 | BUG_ON(node->ref_mod != 1); |
| 2249 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2250 | BUG_ON(!extent_op || !extent_op->update_flags); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2251 | ret = alloc_reserved_tree_block(trans, root, |
| 2252 | parent, ref_root, |
| 2253 | extent_op->flags_to_set, |
| 2254 | &extent_op->key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2255 | ref->level, &ins, |
| 2256 | node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2257 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2258 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2259 | node->num_bytes, parent, ref_root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2260 | ref->level, 0, 1, node->no_quota, |
| 2261 | extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2262 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2263 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2264 | node->num_bytes, parent, ref_root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2265 | ref->level, 0, 1, extent_op, |
| 2266 | node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2267 | } else { |
| 2268 | BUG(); |
| 2269 | } |
| 2270 | return ret; |
| 2271 | } |
| 2272 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2273 | /* helper function to actually process a single delayed ref entry */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2274 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
| 2275 | struct btrfs_root *root, |
| 2276 | struct btrfs_delayed_ref_node *node, |
| 2277 | struct btrfs_delayed_extent_op *extent_op, |
| 2278 | int insert_reserved) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2279 | { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2280 | int ret = 0; |
| 2281 | |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2282 | if (trans->aborted) { |
| 2283 | if (insert_reserved) |
| 2284 | btrfs_pin_extent(root, node->bytenr, |
| 2285 | node->num_bytes, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2286 | return 0; |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2287 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2288 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2289 | if (btrfs_delayed_ref_is_head(node)) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2290 | struct btrfs_delayed_ref_head *head; |
| 2291 | /* |
| 2292 | * we've hit the end of the chain and we were supposed |
| 2293 | * to insert this extent into the tree. But, it got |
| 2294 | * deleted before we ever needed to insert it, so all |
| 2295 | * we have to do is clean up the accounting |
| 2296 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2297 | BUG_ON(extent_op); |
| 2298 | head = btrfs_delayed_node_to_head(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2299 | trace_run_delayed_ref_head(node, head, node->action); |
| 2300 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2301 | if (insert_reserved) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 2302 | btrfs_pin_extent(root, node->bytenr, |
| 2303 | node->num_bytes, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2304 | if (head->is_data) { |
| 2305 | ret = btrfs_del_csums(trans, root, |
| 2306 | node->bytenr, |
| 2307 | node->num_bytes); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2308 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2309 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2310 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2311 | } |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 2312 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2313 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
| 2314 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2315 | ret = run_delayed_tree_ref(trans, root, node, extent_op, |
| 2316 | insert_reserved); |
| 2317 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || |
| 2318 | node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2319 | ret = run_delayed_data_ref(trans, root, node, extent_op, |
| 2320 | insert_reserved); |
| 2321 | else |
| 2322 | BUG(); |
| 2323 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2324 | } |
| 2325 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2326 | static noinline struct btrfs_delayed_ref_node * |
| 2327 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2328 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2329 | struct rb_node *node; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2330 | struct btrfs_delayed_ref_node *ref, *last = NULL;; |
| 2331 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2332 | /* |
| 2333 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. |
| 2334 | * this prevents ref count from going down to zero when |
| 2335 | * there still are pending delayed ref. |
| 2336 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2337 | node = rb_first(&head->ref_root); |
| 2338 | while (node) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2339 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 2340 | rb_node); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2341 | if (ref->action == BTRFS_ADD_DELAYED_REF) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2342 | return ref; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2343 | else if (last == NULL) |
| 2344 | last = ref; |
| 2345 | node = rb_next(node); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2346 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2347 | return last; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2348 | } |
| 2349 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2350 | /* |
| 2351 | * Returns 0 on success or if called with an already aborted transaction. |
| 2352 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. |
| 2353 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2354 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 2355 | struct btrfs_root *root, |
| 2356 | unsigned long nr) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2357 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2358 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2359 | struct btrfs_delayed_ref_node *ref; |
| 2360 | struct btrfs_delayed_ref_head *locked_ref = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2361 | struct btrfs_delayed_extent_op *extent_op; |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2362 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2363 | ktime_t start = ktime_get(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2364 | int ret; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2365 | unsigned long count = 0; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2366 | unsigned long actual_count = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2367 | int must_insert_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2368 | |
| 2369 | delayed_refs = &trans->transaction->delayed_refs; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2370 | while (1) { |
| 2371 | if (!locked_ref) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2372 | if (count >= nr) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2373 | break; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2374 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2375 | spin_lock(&delayed_refs->lock); |
| 2376 | locked_ref = btrfs_select_ref_head(trans); |
| 2377 | if (!locked_ref) { |
| 2378 | spin_unlock(&delayed_refs->lock); |
| 2379 | break; |
| 2380 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2381 | |
| 2382 | /* grab the lock that says we are going to process |
| 2383 | * all the refs for this head */ |
| 2384 | ret = btrfs_delayed_ref_lock(trans, locked_ref); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2385 | spin_unlock(&delayed_refs->lock); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2386 | /* |
| 2387 | * we may have dropped the spin lock to get the head |
| 2388 | * mutex lock, and that might have given someone else |
| 2389 | * time to free the head. If that's true, it has been |
| 2390 | * removed from our list and we can move on. |
| 2391 | */ |
| 2392 | if (ret == -EAGAIN) { |
| 2393 | locked_ref = NULL; |
| 2394 | count++; |
| 2395 | continue; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2396 | } |
| 2397 | } |
| 2398 | |
| 2399 | /* |
Josef Bacik | ae1e206 | 2012-08-07 16:00:32 -0400 | [diff] [blame] | 2400 | * We need to try and merge add/drops of the same ref since we |
| 2401 | * can run into issues with relocate dropping the implicit ref |
| 2402 | * and then it being added back again before the drop can |
| 2403 | * finish. If we merged anything we need to re-loop so we can |
| 2404 | * get a good ref. |
| 2405 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2406 | spin_lock(&locked_ref->lock); |
Josef Bacik | ae1e206 | 2012-08-07 16:00:32 -0400 | [diff] [blame] | 2407 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, |
| 2408 | locked_ref); |
| 2409 | |
| 2410 | /* |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2411 | * locked_ref is the head node, so we have to go one |
| 2412 | * node back for any delayed ref updates |
| 2413 | */ |
| 2414 | ref = select_delayed_ref(locked_ref); |
| 2415 | |
| 2416 | if (ref && ref->seq && |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2417 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2418 | spin_unlock(&locked_ref->lock); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2419 | btrfs_delayed_ref_unlock(locked_ref); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2420 | spin_lock(&delayed_refs->lock); |
| 2421 | locked_ref->processing = 0; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2422 | delayed_refs->num_heads_ready++; |
| 2423 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2424 | locked_ref = NULL; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2425 | cond_resched(); |
Josef Bacik | 27a377d | 2014-02-07 13:57:59 -0500 | [diff] [blame] | 2426 | count++; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2427 | continue; |
| 2428 | } |
| 2429 | |
| 2430 | /* |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2431 | * record the must insert reserved flag before we |
| 2432 | * drop the spin lock. |
| 2433 | */ |
| 2434 | must_insert_reserved = locked_ref->must_insert_reserved; |
| 2435 | locked_ref->must_insert_reserved = 0; |
| 2436 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2437 | extent_op = locked_ref->extent_op; |
| 2438 | locked_ref->extent_op = NULL; |
| 2439 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2440 | if (!ref) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2441 | |
| 2442 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2443 | /* All delayed refs have been processed, Go ahead |
| 2444 | * and send the head node to run_one_delayed_ref, |
| 2445 | * so that any accounting fixes can happen |
| 2446 | */ |
| 2447 | ref = &locked_ref->node; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2448 | |
| 2449 | if (extent_op && must_insert_reserved) { |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2450 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2451 | extent_op = NULL; |
| 2452 | } |
| 2453 | |
| 2454 | if (extent_op) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2455 | spin_unlock(&locked_ref->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2456 | ret = run_delayed_extent_op(trans, root, |
| 2457 | ref, extent_op); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2458 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2459 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2460 | if (ret) { |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2461 | /* |
| 2462 | * Need to reset must_insert_reserved if |
| 2463 | * there was an error so the abort stuff |
| 2464 | * can cleanup the reserved space |
| 2465 | * properly. |
| 2466 | */ |
| 2467 | if (must_insert_reserved) |
| 2468 | locked_ref->must_insert_reserved = 1; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2469 | locked_ref->processing = 0; |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2470 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2471 | btrfs_delayed_ref_unlock(locked_ref); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2472 | return ret; |
| 2473 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2474 | continue; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2475 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2476 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2477 | /* |
| 2478 | * Need to drop our head ref lock and re-aqcuire the |
| 2479 | * delayed ref lock and then re-check to make sure |
| 2480 | * nobody got added. |
| 2481 | */ |
| 2482 | spin_unlock(&locked_ref->lock); |
| 2483 | spin_lock(&delayed_refs->lock); |
| 2484 | spin_lock(&locked_ref->lock); |
Josef Bacik | 573a075 | 2014-03-27 19:41:34 -0400 | [diff] [blame] | 2485 | if (rb_first(&locked_ref->ref_root) || |
| 2486 | locked_ref->extent_op) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2487 | spin_unlock(&locked_ref->lock); |
| 2488 | spin_unlock(&delayed_refs->lock); |
| 2489 | continue; |
| 2490 | } |
| 2491 | ref->in_tree = 0; |
| 2492 | delayed_refs->num_heads--; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2493 | rb_erase(&locked_ref->href_node, |
| 2494 | &delayed_refs->href_root); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2495 | spin_unlock(&delayed_refs->lock); |
| 2496 | } else { |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2497 | actual_count++; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2498 | ref->in_tree = 0; |
| 2499 | rb_erase(&ref->rb_node, &locked_ref->ref_root); |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2500 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2501 | atomic_dec(&delayed_refs->num_entries); |
| 2502 | |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2503 | if (!btrfs_delayed_ref_is_head(ref)) { |
Arne Jansen | 22cd2e7 | 2012-08-09 00:16:53 -0600 | [diff] [blame] | 2504 | /* |
| 2505 | * when we play the delayed ref, also correct the |
| 2506 | * ref_mod on head |
| 2507 | */ |
| 2508 | switch (ref->action) { |
| 2509 | case BTRFS_ADD_DELAYED_REF: |
| 2510 | case BTRFS_ADD_DELAYED_EXTENT: |
| 2511 | locked_ref->node.ref_mod -= ref->ref_mod; |
| 2512 | break; |
| 2513 | case BTRFS_DROP_DELAYED_REF: |
| 2514 | locked_ref->node.ref_mod += ref->ref_mod; |
| 2515 | break; |
| 2516 | default: |
| 2517 | WARN_ON(1); |
| 2518 | } |
| 2519 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2520 | spin_unlock(&locked_ref->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2521 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2522 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2523 | must_insert_reserved); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2524 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2525 | btrfs_free_delayed_extent_op(extent_op); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2526 | if (ret) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2527 | locked_ref->processing = 0; |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2528 | btrfs_delayed_ref_unlock(locked_ref); |
| 2529 | btrfs_put_delayed_ref(ref); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2530 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2531 | return ret; |
| 2532 | } |
| 2533 | |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2534 | /* |
| 2535 | * If this node is a head, that means all the refs in this head |
| 2536 | * have been dealt with, and we will pick the next head to deal |
| 2537 | * with, so we must unlock the head and drop it from the cluster |
| 2538 | * list before we release it. |
| 2539 | */ |
| 2540 | if (btrfs_delayed_ref_is_head(ref)) { |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 2541 | if (locked_ref->is_data && |
| 2542 | locked_ref->total_ref_mod < 0) { |
| 2543 | spin_lock(&delayed_refs->lock); |
| 2544 | delayed_refs->pending_csums -= ref->num_bytes; |
| 2545 | spin_unlock(&delayed_refs->lock); |
| 2546 | } |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2547 | btrfs_delayed_ref_unlock(locked_ref); |
| 2548 | locked_ref = NULL; |
| 2549 | } |
| 2550 | btrfs_put_delayed_ref(ref); |
| 2551 | count++; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2552 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2553 | } |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2554 | |
| 2555 | /* |
| 2556 | * We don't want to include ref heads since we can have empty ref heads |
| 2557 | * and those will drastically skew our runtime down since we just do |
| 2558 | * accounting, no actual extent tree updates. |
| 2559 | */ |
| 2560 | if (actual_count > 0) { |
| 2561 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); |
| 2562 | u64 avg; |
| 2563 | |
| 2564 | /* |
| 2565 | * We weigh the current average higher than our current runtime |
| 2566 | * to avoid large swings in the average. |
| 2567 | */ |
| 2568 | spin_lock(&delayed_refs->lock); |
| 2569 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 2570 | fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */ |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2571 | spin_unlock(&delayed_refs->lock); |
| 2572 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2573 | return 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2574 | } |
| 2575 | |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2576 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2577 | /* |
| 2578 | * Normally delayed refs get processed in ascending bytenr order. This |
| 2579 | * correlates in most cases to the order added. To expose dependencies on this |
| 2580 | * order, we start to process the tree in the middle instead of the beginning |
| 2581 | */ |
| 2582 | static u64 find_middle(struct rb_root *root) |
| 2583 | { |
| 2584 | struct rb_node *n = root->rb_node; |
| 2585 | struct btrfs_delayed_ref_node *entry; |
| 2586 | int alt = 1; |
| 2587 | u64 middle; |
| 2588 | u64 first = 0, last = 0; |
| 2589 | |
| 2590 | n = rb_first(root); |
| 2591 | if (n) { |
| 2592 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2593 | first = entry->bytenr; |
| 2594 | } |
| 2595 | n = rb_last(root); |
| 2596 | if (n) { |
| 2597 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2598 | last = entry->bytenr; |
| 2599 | } |
| 2600 | n = root->rb_node; |
| 2601 | |
| 2602 | while (n) { |
| 2603 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2604 | WARN_ON(!entry->in_tree); |
| 2605 | |
| 2606 | middle = entry->bytenr; |
| 2607 | |
| 2608 | if (alt) |
| 2609 | n = n->rb_left; |
| 2610 | else |
| 2611 | n = n->rb_right; |
| 2612 | |
| 2613 | alt = 1 - alt; |
| 2614 | } |
| 2615 | return middle; |
| 2616 | } |
| 2617 | #endif |
| 2618 | |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2619 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
| 2620 | { |
| 2621 | u64 num_bytes; |
| 2622 | |
| 2623 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + |
| 2624 | sizeof(struct btrfs_extent_inline_ref)); |
| 2625 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2626 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); |
| 2627 | |
| 2628 | /* |
| 2629 | * We don't ever fill up leaves all the way so multiply by 2 just to be |
| 2630 | * closer to what we're really going to want to ouse. |
| 2631 | */ |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 2632 | return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2633 | } |
| 2634 | |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 2635 | /* |
| 2636 | * Takes the number of bytes to be csumm'ed and figures out how many leaves it |
| 2637 | * would require to store the csums for that many bytes. |
| 2638 | */ |
Chris Mason | 28f75a0 | 2015-02-04 06:59:29 -0800 | [diff] [blame] | 2639 | u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes) |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 2640 | { |
| 2641 | u64 csum_size; |
| 2642 | u64 num_csums_per_leaf; |
| 2643 | u64 num_csums; |
| 2644 | |
| 2645 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); |
| 2646 | num_csums_per_leaf = div64_u64(csum_size, |
| 2647 | (u64)btrfs_super_csum_size(root->fs_info->super_copy)); |
| 2648 | num_csums = div64_u64(csum_bytes, root->sectorsize); |
| 2649 | num_csums += num_csums_per_leaf - 1; |
| 2650 | num_csums = div64_u64(num_csums, num_csums_per_leaf); |
| 2651 | return num_csums; |
| 2652 | } |
| 2653 | |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2654 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2655 | struct btrfs_root *root) |
| 2656 | { |
| 2657 | struct btrfs_block_rsv *global_rsv; |
| 2658 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 2659 | u64 csum_bytes = trans->transaction->delayed_refs.pending_csums; |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 2660 | u64 num_dirty_bgs = trans->transaction->num_dirty_bgs; |
| 2661 | u64 num_bytes, num_dirty_bgs_bytes; |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2662 | int ret = 0; |
| 2663 | |
| 2664 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 2665 | num_heads = heads_to_leaves(root, num_heads); |
| 2666 | if (num_heads > 1) |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 2667 | num_bytes += (num_heads - 1) * root->nodesize; |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2668 | num_bytes <<= 1; |
Chris Mason | 28f75a0 | 2015-02-04 06:59:29 -0800 | [diff] [blame] | 2669 | num_bytes += btrfs_csum_bytes_to_leaves(root, csum_bytes) * root->nodesize; |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 2670 | num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(root, |
| 2671 | num_dirty_bgs); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2672 | global_rsv = &root->fs_info->global_block_rsv; |
| 2673 | |
| 2674 | /* |
| 2675 | * If we can't allocate any more chunks lets make sure we have _lots_ of |
| 2676 | * wiggle room since running delayed refs can create more delayed refs. |
| 2677 | */ |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 2678 | if (global_rsv->space_info->full) { |
| 2679 | num_dirty_bgs_bytes <<= 1; |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2680 | num_bytes <<= 1; |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 2681 | } |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2682 | |
| 2683 | spin_lock(&global_rsv->lock); |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 2684 | if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes) |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2685 | ret = 1; |
| 2686 | spin_unlock(&global_rsv->lock); |
| 2687 | return ret; |
| 2688 | } |
| 2689 | |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2690 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
| 2691 | struct btrfs_root *root) |
| 2692 | { |
| 2693 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2694 | u64 num_entries = |
| 2695 | atomic_read(&trans->transaction->delayed_refs.num_entries); |
| 2696 | u64 avg_runtime; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2697 | u64 val; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2698 | |
| 2699 | smp_mb(); |
| 2700 | avg_runtime = fs_info->avg_delayed_ref_runtime; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2701 | val = num_entries * avg_runtime; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2702 | if (num_entries * avg_runtime >= NSEC_PER_SEC) |
| 2703 | return 1; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2704 | if (val >= NSEC_PER_SEC / 2) |
| 2705 | return 2; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2706 | |
| 2707 | return btrfs_check_space_for_delayed_refs(trans, root); |
| 2708 | } |
| 2709 | |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2710 | struct async_delayed_refs { |
| 2711 | struct btrfs_root *root; |
| 2712 | int count; |
| 2713 | int error; |
| 2714 | int sync; |
| 2715 | struct completion wait; |
| 2716 | struct btrfs_work work; |
| 2717 | }; |
| 2718 | |
| 2719 | static void delayed_ref_async_start(struct btrfs_work *work) |
| 2720 | { |
| 2721 | struct async_delayed_refs *async; |
| 2722 | struct btrfs_trans_handle *trans; |
| 2723 | int ret; |
| 2724 | |
| 2725 | async = container_of(work, struct async_delayed_refs, work); |
| 2726 | |
| 2727 | trans = btrfs_join_transaction(async->root); |
| 2728 | if (IS_ERR(trans)) { |
| 2729 | async->error = PTR_ERR(trans); |
| 2730 | goto done; |
| 2731 | } |
| 2732 | |
| 2733 | /* |
| 2734 | * trans->sync means that when we call end_transaciton, we won't |
| 2735 | * wait on delayed refs |
| 2736 | */ |
| 2737 | trans->sync = true; |
| 2738 | ret = btrfs_run_delayed_refs(trans, async->root, async->count); |
| 2739 | if (ret) |
| 2740 | async->error = ret; |
| 2741 | |
| 2742 | ret = btrfs_end_transaction(trans, async->root); |
| 2743 | if (ret && !async->error) |
| 2744 | async->error = ret; |
| 2745 | done: |
| 2746 | if (async->sync) |
| 2747 | complete(&async->wait); |
| 2748 | else |
| 2749 | kfree(async); |
| 2750 | } |
| 2751 | |
| 2752 | int btrfs_async_run_delayed_refs(struct btrfs_root *root, |
| 2753 | unsigned long count, int wait) |
| 2754 | { |
| 2755 | struct async_delayed_refs *async; |
| 2756 | int ret; |
| 2757 | |
| 2758 | async = kmalloc(sizeof(*async), GFP_NOFS); |
| 2759 | if (!async) |
| 2760 | return -ENOMEM; |
| 2761 | |
| 2762 | async->root = root->fs_info->tree_root; |
| 2763 | async->count = count; |
| 2764 | async->error = 0; |
| 2765 | if (wait) |
| 2766 | async->sync = 1; |
| 2767 | else |
| 2768 | async->sync = 0; |
| 2769 | init_completion(&async->wait); |
| 2770 | |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 2771 | btrfs_init_work(&async->work, btrfs_extent_refs_helper, |
| 2772 | delayed_ref_async_start, NULL, NULL); |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2773 | |
| 2774 | btrfs_queue_work(root->fs_info->extent_workers, &async->work); |
| 2775 | |
| 2776 | if (wait) { |
| 2777 | wait_for_completion(&async->wait); |
| 2778 | ret = async->error; |
| 2779 | kfree(async); |
| 2780 | return ret; |
| 2781 | } |
| 2782 | return 0; |
| 2783 | } |
| 2784 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2785 | /* |
| 2786 | * this starts processing the delayed reference count updates and |
| 2787 | * extent insertions we have queued up so far. count can be |
| 2788 | * 0, which means to process everything in the tree at the start |
| 2789 | * of the run (but not newly added entries), or it can be some target |
| 2790 | * number you'd like to process. |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2791 | * |
| 2792 | * Returns 0 on success or if called with an aborted transaction |
| 2793 | * Returns <0 on error and aborts the transaction |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2794 | */ |
| 2795 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 2796 | struct btrfs_root *root, unsigned long count) |
| 2797 | { |
| 2798 | struct rb_node *node; |
| 2799 | struct btrfs_delayed_ref_root *delayed_refs; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2800 | struct btrfs_delayed_ref_head *head; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2801 | int ret; |
| 2802 | int run_all = count == (unsigned long)-1; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2803 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2804 | /* We'll clean this up in btrfs_cleanup_transaction */ |
| 2805 | if (trans->aborted) |
| 2806 | return 0; |
| 2807 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2808 | if (root == root->fs_info->extent_root) |
| 2809 | root = root->fs_info->tree_root; |
| 2810 | |
| 2811 | delayed_refs = &trans->transaction->delayed_refs; |
Liu Bo | 26455d3 | 2014-12-17 16:14:09 +0800 | [diff] [blame] | 2812 | if (count == 0) |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2813 | count = atomic_read(&delayed_refs->num_entries) * 2; |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2814 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2815 | again: |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2816 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2817 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); |
| 2818 | #endif |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2819 | ret = __btrfs_run_delayed_refs(trans, root, count); |
| 2820 | if (ret < 0) { |
| 2821 | btrfs_abort_transaction(trans, root, ret); |
| 2822 | return ret; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2823 | } |
| 2824 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2825 | if (run_all) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2826 | if (!list_empty(&trans->new_bgs)) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 2827 | btrfs_create_pending_block_groups(trans, root); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 2828 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2829 | spin_lock(&delayed_refs->lock); |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2830 | node = rb_first(&delayed_refs->href_root); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2831 | if (!node) { |
| 2832 | spin_unlock(&delayed_refs->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2833 | goto out; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2834 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2835 | count = (unsigned long)-1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2836 | |
| 2837 | while (node) { |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2838 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
| 2839 | href_node); |
| 2840 | if (btrfs_delayed_ref_is_head(&head->node)) { |
| 2841 | struct btrfs_delayed_ref_node *ref; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2842 | |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2843 | ref = &head->node; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2844 | atomic_inc(&ref->refs); |
| 2845 | |
| 2846 | spin_unlock(&delayed_refs->lock); |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2847 | /* |
| 2848 | * Mutex was contended, block until it's |
| 2849 | * released and try again |
| 2850 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2851 | mutex_lock(&head->mutex); |
| 2852 | mutex_unlock(&head->mutex); |
| 2853 | |
| 2854 | btrfs_put_delayed_ref(ref); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2855 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2856 | goto again; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2857 | } else { |
| 2858 | WARN_ON(1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2859 | } |
| 2860 | node = rb_next(node); |
| 2861 | } |
| 2862 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2863 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2864 | goto again; |
| 2865 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2866 | out: |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2867 | ret = btrfs_delayed_qgroup_accounting(trans, root->fs_info); |
| 2868 | if (ret) |
| 2869 | return ret; |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 2870 | assert_qgroups_uptodate(trans); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2871 | return 0; |
| 2872 | } |
| 2873 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2874 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
| 2875 | struct btrfs_root *root, |
| 2876 | u64 bytenr, u64 num_bytes, u64 flags, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2877 | int level, int is_data) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2878 | { |
| 2879 | struct btrfs_delayed_extent_op *extent_op; |
| 2880 | int ret; |
| 2881 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2882 | extent_op = btrfs_alloc_delayed_extent_op(); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2883 | if (!extent_op) |
| 2884 | return -ENOMEM; |
| 2885 | |
| 2886 | extent_op->flags_to_set = flags; |
| 2887 | extent_op->update_flags = 1; |
| 2888 | extent_op->update_key = 0; |
| 2889 | extent_op->is_data = is_data ? 1 : 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2890 | extent_op->level = level; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2891 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 2892 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
| 2893 | num_bytes, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2894 | if (ret) |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2895 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2896 | return ret; |
| 2897 | } |
| 2898 | |
| 2899 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, |
| 2900 | struct btrfs_root *root, |
| 2901 | struct btrfs_path *path, |
| 2902 | u64 objectid, u64 offset, u64 bytenr) |
| 2903 | { |
| 2904 | struct btrfs_delayed_ref_head *head; |
| 2905 | struct btrfs_delayed_ref_node *ref; |
| 2906 | struct btrfs_delayed_data_ref *data_ref; |
| 2907 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2908 | struct rb_node *node; |
| 2909 | int ret = 0; |
| 2910 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2911 | delayed_refs = &trans->transaction->delayed_refs; |
| 2912 | spin_lock(&delayed_refs->lock); |
| 2913 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2914 | if (!head) { |
| 2915 | spin_unlock(&delayed_refs->lock); |
| 2916 | return 0; |
| 2917 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2918 | |
| 2919 | if (!mutex_trylock(&head->mutex)) { |
| 2920 | atomic_inc(&head->node.refs); |
| 2921 | spin_unlock(&delayed_refs->lock); |
| 2922 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2923 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2924 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2925 | /* |
| 2926 | * Mutex was contended, block until it's released and let |
| 2927 | * caller try again |
| 2928 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2929 | mutex_lock(&head->mutex); |
| 2930 | mutex_unlock(&head->mutex); |
| 2931 | btrfs_put_delayed_ref(&head->node); |
| 2932 | return -EAGAIN; |
| 2933 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2934 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2935 | |
| 2936 | spin_lock(&head->lock); |
| 2937 | node = rb_first(&head->ref_root); |
| 2938 | while (node) { |
| 2939 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
| 2940 | node = rb_next(node); |
| 2941 | |
| 2942 | /* If it's a shared ref we know a cross reference exists */ |
| 2943 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { |
| 2944 | ret = 1; |
| 2945 | break; |
| 2946 | } |
| 2947 | |
| 2948 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
| 2949 | |
| 2950 | /* |
| 2951 | * If our ref doesn't match the one we're currently looking at |
| 2952 | * then we have a cross reference. |
| 2953 | */ |
| 2954 | if (data_ref->root != root->root_key.objectid || |
| 2955 | data_ref->objectid != objectid || |
| 2956 | data_ref->offset != offset) { |
| 2957 | ret = 1; |
| 2958 | break; |
| 2959 | } |
| 2960 | } |
| 2961 | spin_unlock(&head->lock); |
| 2962 | mutex_unlock(&head->mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2963 | return ret; |
| 2964 | } |
| 2965 | |
| 2966 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, |
| 2967 | struct btrfs_root *root, |
| 2968 | struct btrfs_path *path, |
| 2969 | u64 objectid, u64 offset, u64 bytenr) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2970 | { |
| 2971 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2972 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2973 | struct btrfs_extent_data_ref *ref; |
| 2974 | struct btrfs_extent_inline_ref *iref; |
| 2975 | struct btrfs_extent_item *ei; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2976 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2977 | u32 item_size; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2978 | int ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2979 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2980 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2981 | key.offset = (u64)-1; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2982 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2983 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2984 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 2985 | if (ret < 0) |
| 2986 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2987 | BUG_ON(ret == 0); /* Corruption */ |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 2988 | |
| 2989 | ret = -ENOENT; |
| 2990 | if (path->slots[0] == 0) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2991 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2992 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2993 | path->slots[0]--; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2994 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2995 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2996 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2997 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2998 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2999 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3000 | ret = 1; |
| 3001 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 3002 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 3003 | if (item_size < sizeof(*ei)) { |
| 3004 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); |
| 3005 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 3006 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3007 | #endif |
| 3008 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 3009 | |
| 3010 | if (item_size != sizeof(*ei) + |
| 3011 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) |
| 3012 | goto out; |
| 3013 | |
| 3014 | if (btrfs_extent_generation(leaf, ei) <= |
| 3015 | btrfs_root_last_snapshot(&root->root_item)) |
| 3016 | goto out; |
| 3017 | |
| 3018 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| 3019 | if (btrfs_extent_inline_ref_type(leaf, iref) != |
| 3020 | BTRFS_EXTENT_DATA_REF_KEY) |
| 3021 | goto out; |
| 3022 | |
| 3023 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 3024 | if (btrfs_extent_refs(leaf, ei) != |
| 3025 | btrfs_extent_data_ref_count(leaf, ref) || |
| 3026 | btrfs_extent_data_ref_root(leaf, ref) != |
| 3027 | root->root_key.objectid || |
| 3028 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || |
| 3029 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 3030 | goto out; |
| 3031 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3032 | ret = 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 3033 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3034 | return ret; |
| 3035 | } |
| 3036 | |
| 3037 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
| 3038 | struct btrfs_root *root, |
| 3039 | u64 objectid, u64 offset, u64 bytenr) |
| 3040 | { |
| 3041 | struct btrfs_path *path; |
| 3042 | int ret; |
| 3043 | int ret2; |
| 3044 | |
| 3045 | path = btrfs_alloc_path(); |
| 3046 | if (!path) |
| 3047 | return -ENOENT; |
| 3048 | |
| 3049 | do { |
| 3050 | ret = check_committed_ref(trans, root, path, objectid, |
| 3051 | offset, bytenr); |
| 3052 | if (ret && ret != -ENOENT) |
| 3053 | goto out; |
| 3054 | |
| 3055 | ret2 = check_delayed_ref(trans, root, path, objectid, |
| 3056 | offset, bytenr); |
| 3057 | } while (ret2 == -EAGAIN); |
| 3058 | |
| 3059 | if (ret2 && ret2 != -ENOENT) { |
| 3060 | ret = ret2; |
| 3061 | goto out; |
| 3062 | } |
| 3063 | |
| 3064 | if (ret != -ENOENT || ret2 != -ENOENT) |
| 3065 | ret = 0; |
| 3066 | out: |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3067 | btrfs_free_path(path); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3068 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 3069 | WARN_ON(ret > 0); |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3070 | return ret; |
| 3071 | } |
| 3072 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3073 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3074 | struct btrfs_root *root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3075 | struct extent_buffer *buf, |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3076 | int full_backref, int inc) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3077 | { |
| 3078 | u64 bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3079 | u64 num_bytes; |
| 3080 | u64 parent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3081 | u64 ref_root; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3082 | u32 nritems; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3083 | struct btrfs_key key; |
| 3084 | struct btrfs_file_extent_item *fi; |
| 3085 | int i; |
| 3086 | int level; |
| 3087 | int ret = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3088 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3089 | u64, u64, u64, u64, u64, u64, int); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3090 | |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 3091 | |
| 3092 | if (btrfs_test_is_dummy_root(root)) |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 3093 | return 0; |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 3094 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3095 | ref_root = btrfs_header_owner(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3096 | nritems = btrfs_header_nritems(buf); |
| 3097 | level = btrfs_header_level(buf); |
| 3098 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 3099 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3100 | return 0; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3101 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3102 | if (inc) |
| 3103 | process_func = btrfs_inc_extent_ref; |
| 3104 | else |
| 3105 | process_func = btrfs_free_extent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3106 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3107 | if (full_backref) |
| 3108 | parent = buf->start; |
| 3109 | else |
| 3110 | parent = 0; |
| 3111 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3112 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3113 | if (level == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3114 | btrfs_item_key_to_cpu(buf, &key, i); |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 3115 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3116 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3117 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3118 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3119 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3120 | BTRFS_FILE_EXTENT_INLINE) |
| 3121 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3122 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 3123 | if (bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3124 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3125 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3126 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); |
| 3127 | key.offset -= btrfs_file_extent_offset(buf, fi); |
| 3128 | ret = process_func(trans, root, bytenr, num_bytes, |
| 3129 | parent, ref_root, key.objectid, |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3130 | key.offset, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3131 | if (ret) |
| 3132 | goto fail; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3133 | } else { |
| 3134 | bytenr = btrfs_node_blockptr(buf, i); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3135 | num_bytes = root->nodesize; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3136 | ret = process_func(trans, root, bytenr, num_bytes, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3137 | parent, ref_root, level - 1, 0, |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3138 | 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3139 | if (ret) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3140 | goto fail; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3141 | } |
| 3142 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3143 | return 0; |
| 3144 | fail: |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3145 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 3146 | } |
| 3147 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3148 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3149 | struct extent_buffer *buf, int full_backref) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3150 | { |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3151 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3152 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3153 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3154 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3155 | struct extent_buffer *buf, int full_backref) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3156 | { |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 3157 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3158 | } |
| 3159 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3160 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 3161 | struct btrfs_root *root, |
| 3162 | struct btrfs_path *path, |
| 3163 | struct btrfs_block_group_cache *cache) |
| 3164 | { |
| 3165 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3166 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3167 | unsigned long bi; |
| 3168 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3169 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3170 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Josef Bacik | df95e7f | 2014-12-12 16:02:20 -0500 | [diff] [blame] | 3171 | if (ret) { |
| 3172 | if (ret > 0) |
| 3173 | ret = -ENOENT; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3174 | goto fail; |
Josef Bacik | df95e7f | 2014-12-12 16:02:20 -0500 | [diff] [blame] | 3175 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3176 | |
| 3177 | leaf = path->nodes[0]; |
| 3178 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 3179 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 3180 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3181 | btrfs_release_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3182 | fail: |
Josef Bacik | df95e7f | 2014-12-12 16:02:20 -0500 | [diff] [blame] | 3183 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3184 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | df95e7f | 2014-12-12 16:02:20 -0500 | [diff] [blame] | 3185 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3186 | |
| 3187 | } |
| 3188 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3189 | static struct btrfs_block_group_cache * |
| 3190 | next_block_group(struct btrfs_root *root, |
| 3191 | struct btrfs_block_group_cache *cache) |
| 3192 | { |
| 3193 | struct rb_node *node; |
Filipe Manana | 292cbd5 | 2014-11-26 15:28:50 +0000 | [diff] [blame] | 3194 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3195 | spin_lock(&root->fs_info->block_group_cache_lock); |
Filipe Manana | 292cbd5 | 2014-11-26 15:28:50 +0000 | [diff] [blame] | 3196 | |
| 3197 | /* If our block group was removed, we need a full search. */ |
| 3198 | if (RB_EMPTY_NODE(&cache->cache_node)) { |
| 3199 | const u64 next_bytenr = cache->key.objectid + cache->key.offset; |
| 3200 | |
| 3201 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 3202 | btrfs_put_block_group(cache); |
| 3203 | cache = btrfs_lookup_first_block_group(root->fs_info, |
| 3204 | next_bytenr); |
| 3205 | return cache; |
| 3206 | } |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3207 | node = rb_next(&cache->cache_node); |
| 3208 | btrfs_put_block_group(cache); |
| 3209 | if (node) { |
| 3210 | cache = rb_entry(node, struct btrfs_block_group_cache, |
| 3211 | cache_node); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 3212 | btrfs_get_block_group(cache); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3213 | } else |
| 3214 | cache = NULL; |
| 3215 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 3216 | return cache; |
| 3217 | } |
| 3218 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3219 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
| 3220 | struct btrfs_trans_handle *trans, |
| 3221 | struct btrfs_path *path) |
| 3222 | { |
| 3223 | struct btrfs_root *root = block_group->fs_info->tree_root; |
| 3224 | struct inode *inode = NULL; |
| 3225 | u64 alloc_hint = 0; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3226 | int dcs = BTRFS_DC_ERROR; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 3227 | u64 num_pages = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3228 | int retries = 0; |
| 3229 | int ret = 0; |
| 3230 | |
| 3231 | /* |
| 3232 | * If this block group is smaller than 100 megs don't bother caching the |
| 3233 | * block group. |
| 3234 | */ |
| 3235 | if (block_group->key.offset < (100 * 1024 * 1024)) { |
| 3236 | spin_lock(&block_group->lock); |
| 3237 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 3238 | spin_unlock(&block_group->lock); |
| 3239 | return 0; |
| 3240 | } |
| 3241 | |
Josef Bacik | 0c0ef4b | 2015-02-12 09:43:51 -0500 | [diff] [blame] | 3242 | if (trans->aborted) |
| 3243 | return 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3244 | again: |
| 3245 | inode = lookup_free_space_inode(root, block_group, path); |
| 3246 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { |
| 3247 | ret = PTR_ERR(inode); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3248 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3249 | goto out; |
| 3250 | } |
| 3251 | |
| 3252 | if (IS_ERR(inode)) { |
| 3253 | BUG_ON(retries); |
| 3254 | retries++; |
| 3255 | |
| 3256 | if (block_group->ro) |
| 3257 | goto out_free; |
| 3258 | |
| 3259 | ret = create_free_space_inode(root, trans, block_group, path); |
| 3260 | if (ret) |
| 3261 | goto out_free; |
| 3262 | goto again; |
| 3263 | } |
| 3264 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3265 | /* We've already setup this transaction, go ahead and exit */ |
| 3266 | if (block_group->cache_generation == trans->transid && |
| 3267 | i_size_read(inode)) { |
| 3268 | dcs = BTRFS_DC_SETUP; |
| 3269 | goto out_put; |
| 3270 | } |
| 3271 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3272 | /* |
| 3273 | * We want to set the generation to 0, that way if anything goes wrong |
| 3274 | * from here on out we know not to trust this cache when we load up next |
| 3275 | * time. |
| 3276 | */ |
| 3277 | BTRFS_I(inode)->generation = 0; |
| 3278 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 0c0ef4b | 2015-02-12 09:43:51 -0500 | [diff] [blame] | 3279 | if (ret) { |
| 3280 | /* |
| 3281 | * So theoretically we could recover from this, simply set the |
| 3282 | * super cache generation to 0 so we know to invalidate the |
| 3283 | * cache, but then we'd have to keep track of the block groups |
| 3284 | * that fail this way so we know we _have_ to reset this cache |
| 3285 | * before the next commit or risk reading stale cache. So to |
| 3286 | * limit our exposure to horrible edge cases lets just abort the |
| 3287 | * transaction, this only happens in really bad situations |
| 3288 | * anyway. |
| 3289 | */ |
| 3290 | btrfs_abort_transaction(trans, root, ret); |
| 3291 | goto out_put; |
| 3292 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3293 | WARN_ON(ret); |
| 3294 | |
| 3295 | if (i_size_read(inode) > 0) { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 3296 | ret = btrfs_check_trunc_cache_free_space(root, |
| 3297 | &root->fs_info->global_block_rsv); |
| 3298 | if (ret) |
| 3299 | goto out_put; |
| 3300 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3301 | ret = btrfs_truncate_free_space_cache(root, trans, NULL, inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3302 | if (ret) |
| 3303 | goto out_put; |
| 3304 | } |
| 3305 | |
| 3306 | spin_lock(&block_group->lock); |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 3307 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 3308 | !btrfs_test_opt(root, SPACE_CACHE) || |
| 3309 | block_group->delalloc_bytes) { |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 3310 | /* |
| 3311 | * don't bother trying to write stuff out _if_ |
| 3312 | * a) we're not cached, |
| 3313 | * b) we're with nospace_cache mount option. |
| 3314 | */ |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3315 | dcs = BTRFS_DC_WRITTEN; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3316 | spin_unlock(&block_group->lock); |
| 3317 | goto out_put; |
| 3318 | } |
| 3319 | spin_unlock(&block_group->lock); |
| 3320 | |
Josef Bacik | 6fc823b | 2012-08-06 13:46:38 -0600 | [diff] [blame] | 3321 | /* |
| 3322 | * Try to preallocate enough space based on how big the block group is. |
| 3323 | * Keep in mind this has to include any pinned space which could end up |
| 3324 | * taking up quite a bit since it's not folded into the other space |
| 3325 | * cache. |
| 3326 | */ |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 3327 | num_pages = div_u64(block_group->key.offset, 256 * 1024 * 1024); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3328 | if (!num_pages) |
| 3329 | num_pages = 1; |
| 3330 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3331 | num_pages *= 16; |
| 3332 | num_pages *= PAGE_CACHE_SIZE; |
| 3333 | |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 3334 | ret = btrfs_check_data_free_space(inode, num_pages, num_pages); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3335 | if (ret) |
| 3336 | goto out_put; |
| 3337 | |
| 3338 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, |
| 3339 | num_pages, num_pages, |
| 3340 | &alloc_hint); |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3341 | if (!ret) |
| 3342 | dcs = BTRFS_DC_SETUP; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3343 | btrfs_free_reserved_data_space(inode, num_pages); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3344 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3345 | out_put: |
| 3346 | iput(inode); |
| 3347 | out_free: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3348 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3349 | out: |
| 3350 | spin_lock(&block_group->lock); |
Josef Bacik | e65cbb9 | 2011-12-13 16:04:54 -0500 | [diff] [blame] | 3351 | if (!ret && dcs == BTRFS_DC_SETUP) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3352 | block_group->cache_generation = trans->transid; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3353 | block_group->disk_cache_state = dcs; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3354 | spin_unlock(&block_group->lock); |
| 3355 | |
| 3356 | return ret; |
| 3357 | } |
| 3358 | |
Josef Bacik | dcdf7f6 | 2015-03-02 16:37:31 -0500 | [diff] [blame] | 3359 | int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, |
| 3360 | struct btrfs_root *root) |
| 3361 | { |
| 3362 | struct btrfs_block_group_cache *cache, *tmp; |
| 3363 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 3364 | struct btrfs_path *path; |
| 3365 | |
| 3366 | if (list_empty(&cur_trans->dirty_bgs) || |
| 3367 | !btrfs_test_opt(root, SPACE_CACHE)) |
| 3368 | return 0; |
| 3369 | |
| 3370 | path = btrfs_alloc_path(); |
| 3371 | if (!path) |
| 3372 | return -ENOMEM; |
| 3373 | |
| 3374 | /* Could add new block groups, use _safe just in case */ |
| 3375 | list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, |
| 3376 | dirty_list) { |
| 3377 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) |
| 3378 | cache_save_setup(cache, trans, path); |
| 3379 | } |
| 3380 | |
| 3381 | btrfs_free_path(path); |
| 3382 | return 0; |
| 3383 | } |
| 3384 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3385 | /* |
| 3386 | * transaction commit does final block group cache writeback during a |
| 3387 | * critical section where nothing is allowed to change the FS. This is |
| 3388 | * required in order for the cache to actually match the block group, |
| 3389 | * but can introduce a lot of latency into the commit. |
| 3390 | * |
| 3391 | * So, btrfs_start_dirty_block_groups is here to kick off block group |
| 3392 | * cache IO. There's a chance we'll have to redo some of it if the |
| 3393 | * block group changes again during the commit, but it greatly reduces |
| 3394 | * the commit latency by getting rid of the easy block groups while |
| 3395 | * we're still allowing others to join the commit. |
| 3396 | */ |
| 3397 | int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 3398 | struct btrfs_root *root) |
| 3399 | { |
| 3400 | struct btrfs_block_group_cache *cache; |
| 3401 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 3402 | int ret = 0; |
| 3403 | int should_put; |
| 3404 | struct btrfs_path *path = NULL; |
| 3405 | LIST_HEAD(dirty); |
| 3406 | struct list_head *io = &cur_trans->io_bgs; |
| 3407 | int num_started = 0; |
| 3408 | int loops = 0; |
| 3409 | |
| 3410 | spin_lock(&cur_trans->dirty_bgs_lock); |
| 3411 | if (!list_empty(&cur_trans->dirty_bgs)) { |
| 3412 | list_splice_init(&cur_trans->dirty_bgs, &dirty); |
| 3413 | } |
| 3414 | spin_unlock(&cur_trans->dirty_bgs_lock); |
| 3415 | |
| 3416 | again: |
| 3417 | if (list_empty(&dirty)) { |
| 3418 | btrfs_free_path(path); |
| 3419 | return 0; |
| 3420 | } |
| 3421 | |
| 3422 | /* |
| 3423 | * make sure all the block groups on our dirty list actually |
| 3424 | * exist |
| 3425 | */ |
| 3426 | btrfs_create_pending_block_groups(trans, root); |
| 3427 | |
| 3428 | if (!path) { |
| 3429 | path = btrfs_alloc_path(); |
| 3430 | if (!path) |
| 3431 | return -ENOMEM; |
| 3432 | } |
| 3433 | |
| 3434 | while (!list_empty(&dirty)) { |
| 3435 | cache = list_first_entry(&dirty, |
| 3436 | struct btrfs_block_group_cache, |
| 3437 | dirty_list); |
| 3438 | |
| 3439 | /* |
| 3440 | * cache_write_mutex is here only to save us from balance |
| 3441 | * deleting this block group while we are writing out the |
| 3442 | * cache |
| 3443 | */ |
| 3444 | mutex_lock(&trans->transaction->cache_write_mutex); |
| 3445 | |
| 3446 | /* |
| 3447 | * this can happen if something re-dirties a block |
| 3448 | * group that is already under IO. Just wait for it to |
| 3449 | * finish and then do it all again |
| 3450 | */ |
| 3451 | if (!list_empty(&cache->io_list)) { |
| 3452 | list_del_init(&cache->io_list); |
| 3453 | btrfs_wait_cache_io(root, trans, cache, |
| 3454 | &cache->io_ctl, path, |
| 3455 | cache->key.objectid); |
| 3456 | btrfs_put_block_group(cache); |
| 3457 | } |
| 3458 | |
| 3459 | |
| 3460 | /* |
| 3461 | * btrfs_wait_cache_io uses the cache->dirty_list to decide |
| 3462 | * if it should update the cache_state. Don't delete |
| 3463 | * until after we wait. |
| 3464 | * |
| 3465 | * Since we're not running in the commit critical section |
| 3466 | * we need the dirty_bgs_lock to protect from update_block_group |
| 3467 | */ |
| 3468 | spin_lock(&cur_trans->dirty_bgs_lock); |
| 3469 | list_del_init(&cache->dirty_list); |
| 3470 | spin_unlock(&cur_trans->dirty_bgs_lock); |
| 3471 | |
| 3472 | should_put = 1; |
| 3473 | |
| 3474 | cache_save_setup(cache, trans, path); |
| 3475 | |
| 3476 | if (cache->disk_cache_state == BTRFS_DC_SETUP) { |
| 3477 | cache->io_ctl.inode = NULL; |
| 3478 | ret = btrfs_write_out_cache(root, trans, cache, path); |
| 3479 | if (ret == 0 && cache->io_ctl.inode) { |
| 3480 | num_started++; |
| 3481 | should_put = 0; |
| 3482 | |
| 3483 | /* |
| 3484 | * the cache_write_mutex is protecting |
| 3485 | * the io_list |
| 3486 | */ |
| 3487 | list_add_tail(&cache->io_list, io); |
| 3488 | } else { |
| 3489 | /* |
| 3490 | * if we failed to write the cache, the |
| 3491 | * generation will be bad and life goes on |
| 3492 | */ |
| 3493 | ret = 0; |
| 3494 | } |
| 3495 | } |
| 3496 | if (!ret) |
| 3497 | ret = write_one_cache_group(trans, root, path, cache); |
| 3498 | mutex_unlock(&trans->transaction->cache_write_mutex); |
| 3499 | |
| 3500 | /* if its not on the io list, we need to put the block group */ |
| 3501 | if (should_put) |
| 3502 | btrfs_put_block_group(cache); |
| 3503 | |
| 3504 | if (ret) |
| 3505 | break; |
| 3506 | } |
| 3507 | |
| 3508 | /* |
| 3509 | * go through delayed refs for all the stuff we've just kicked off |
| 3510 | * and then loop back (just once) |
| 3511 | */ |
| 3512 | ret = btrfs_run_delayed_refs(trans, root, 0); |
| 3513 | if (!ret && loops == 0) { |
| 3514 | loops++; |
| 3515 | spin_lock(&cur_trans->dirty_bgs_lock); |
| 3516 | list_splice_init(&cur_trans->dirty_bgs, &dirty); |
| 3517 | spin_unlock(&cur_trans->dirty_bgs_lock); |
| 3518 | goto again; |
| 3519 | } |
| 3520 | |
| 3521 | btrfs_free_path(path); |
| 3522 | return ret; |
| 3523 | } |
| 3524 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3525 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 3526 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3527 | { |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3528 | struct btrfs_block_group_cache *cache; |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3529 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 3530 | int ret = 0; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3531 | int should_put; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3532 | struct btrfs_path *path; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3533 | struct list_head *io = &cur_trans->io_bgs; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3534 | int num_started = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3535 | |
| 3536 | path = btrfs_alloc_path(); |
| 3537 | if (!path) |
| 3538 | return -ENOMEM; |
| 3539 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3540 | /* |
| 3541 | * We don't need the lock here since we are protected by the transaction |
| 3542 | * commit. We want to do the cache_save_setup first and then run the |
| 3543 | * delayed refs to make sure we have the best chance at doing this all |
| 3544 | * in one shot. |
| 3545 | */ |
| 3546 | while (!list_empty(&cur_trans->dirty_bgs)) { |
| 3547 | cache = list_first_entry(&cur_trans->dirty_bgs, |
| 3548 | struct btrfs_block_group_cache, |
| 3549 | dirty_list); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3550 | |
| 3551 | /* |
| 3552 | * this can happen if cache_save_setup re-dirties a block |
| 3553 | * group that is already under IO. Just wait for it to |
| 3554 | * finish and then do it all again |
| 3555 | */ |
| 3556 | if (!list_empty(&cache->io_list)) { |
| 3557 | list_del_init(&cache->io_list); |
| 3558 | btrfs_wait_cache_io(root, trans, cache, |
| 3559 | &cache->io_ctl, path, |
| 3560 | cache->key.objectid); |
| 3561 | btrfs_put_block_group(cache); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3562 | } |
| 3563 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3564 | /* |
| 3565 | * don't remove from the dirty list until after we've waited |
| 3566 | * on any pending IO |
| 3567 | */ |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3568 | list_del_init(&cache->dirty_list); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3569 | should_put = 1; |
| 3570 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3571 | cache_save_setup(cache, trans, path); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3572 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3573 | if (!ret) |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3574 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long) -1); |
| 3575 | |
| 3576 | if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { |
| 3577 | cache->io_ctl.inode = NULL; |
| 3578 | ret = btrfs_write_out_cache(root, trans, cache, path); |
| 3579 | if (ret == 0 && cache->io_ctl.inode) { |
| 3580 | num_started++; |
| 3581 | should_put = 0; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3582 | list_add_tail(&cache->io_list, io); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3583 | } else { |
| 3584 | /* |
| 3585 | * if we failed to write the cache, the |
| 3586 | * generation will be bad and life goes on |
| 3587 | */ |
| 3588 | ret = 0; |
| 3589 | } |
| 3590 | } |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3591 | if (!ret) |
| 3592 | ret = write_one_cache_group(trans, root, path, cache); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3593 | |
| 3594 | /* if its not on the io list, we need to put the block group */ |
| 3595 | if (should_put) |
| 3596 | btrfs_put_block_group(cache); |
| 3597 | } |
| 3598 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3599 | while (!list_empty(io)) { |
| 3600 | cache = list_first_entry(io, struct btrfs_block_group_cache, |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3601 | io_list); |
| 3602 | list_del_init(&cache->io_list); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3603 | btrfs_wait_cache_io(root, trans, cache, |
| 3604 | &cache->io_ctl, path, cache->key.objectid); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3605 | btrfs_put_block_group(cache); |
| 3606 | } |
| 3607 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3608 | btrfs_free_path(path); |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 3609 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3610 | } |
| 3611 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3612 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
| 3613 | { |
| 3614 | struct btrfs_block_group_cache *block_group; |
| 3615 | int readonly = 0; |
| 3616 | |
| 3617 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
| 3618 | if (!block_group || block_group->ro) |
| 3619 | readonly = 1; |
| 3620 | if (block_group) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3621 | btrfs_put_block_group(block_group); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3622 | return readonly; |
| 3623 | } |
| 3624 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3625 | static const char *alloc_name(u64 flags) |
| 3626 | { |
| 3627 | switch (flags) { |
| 3628 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: |
| 3629 | return "mixed"; |
| 3630 | case BTRFS_BLOCK_GROUP_METADATA: |
| 3631 | return "metadata"; |
| 3632 | case BTRFS_BLOCK_GROUP_DATA: |
| 3633 | return "data"; |
| 3634 | case BTRFS_BLOCK_GROUP_SYSTEM: |
| 3635 | return "system"; |
| 3636 | default: |
| 3637 | WARN_ON(1); |
| 3638 | return "invalid-combination"; |
| 3639 | }; |
| 3640 | } |
| 3641 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3642 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 3643 | u64 total_bytes, u64 bytes_used, |
| 3644 | struct btrfs_space_info **space_info) |
| 3645 | { |
| 3646 | struct btrfs_space_info *found; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3647 | int i; |
| 3648 | int factor; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3649 | int ret; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3650 | |
| 3651 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | |
| 3652 | BTRFS_BLOCK_GROUP_RAID10)) |
| 3653 | factor = 2; |
| 3654 | else |
| 3655 | factor = 1; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3656 | |
| 3657 | found = __find_space_info(info, flags); |
| 3658 | if (found) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3659 | spin_lock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3660 | found->total_bytes += total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3661 | found->disk_total += total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3662 | found->bytes_used += bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3663 | found->disk_used += bytes_used * factor; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3664 | found->full = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3665 | spin_unlock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3666 | *space_info = found; |
| 3667 | return 0; |
| 3668 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3669 | found = kzalloc(sizeof(*found), GFP_NOFS); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3670 | if (!found) |
| 3671 | return -ENOMEM; |
| 3672 | |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 3673 | ret = percpu_counter_init(&found->total_bytes_pinned, 0, GFP_KERNEL); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3674 | if (ret) { |
| 3675 | kfree(found); |
| 3676 | return ret; |
| 3677 | } |
| 3678 | |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 3679 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3680 | INIT_LIST_HEAD(&found->block_groups[i]); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3681 | init_rwsem(&found->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3682 | spin_lock_init(&found->lock); |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3683 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3684 | found->total_bytes = total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3685 | found->disk_total = total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3686 | found->bytes_used = bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3687 | found->disk_used = bytes_used * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3688 | found->bytes_pinned = 0; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3689 | found->bytes_reserved = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3690 | found->bytes_readonly = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3691 | found->bytes_may_use = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3692 | found->full = 0; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3693 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3694 | found->chunk_alloc = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 3695 | found->flush = 0; |
| 3696 | init_waitqueue_head(&found->wait); |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 3697 | INIT_LIST_HEAD(&found->ro_bgs); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3698 | |
| 3699 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, |
| 3700 | info->space_info_kobj, "%s", |
| 3701 | alloc_name(found->flags)); |
| 3702 | if (ret) { |
| 3703 | kfree(found); |
| 3704 | return ret; |
| 3705 | } |
| 3706 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3707 | *space_info = found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 3708 | list_add_rcu(&found->list, &info->space_info); |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3709 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3710 | info->data_sinfo = found; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3711 | |
| 3712 | return ret; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3713 | } |
| 3714 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3715 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 3716 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 3717 | u64 extra_flags = chunk_to_extended(flags) & |
| 3718 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3719 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3720 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3721 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3722 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 3723 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3724 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 3725 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3726 | fs_info->avail_system_alloc_bits |= extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3727 | write_sequnlock(&fs_info->profiles_lock); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3728 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3729 | |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3730 | /* |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3731 | * returns target flags in extended format or 0 if restripe for this |
| 3732 | * chunk_type is not in progress |
Ilya Dryomov | c6664b4 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 3733 | * |
| 3734 | * should be called with either volume_mutex or balance_lock held |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3735 | */ |
| 3736 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) |
| 3737 | { |
| 3738 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
| 3739 | u64 target = 0; |
| 3740 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3741 | if (!bctl) |
| 3742 | return 0; |
| 3743 | |
| 3744 | if (flags & BTRFS_BLOCK_GROUP_DATA && |
| 3745 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3746 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; |
| 3747 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && |
| 3748 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3749 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; |
| 3750 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && |
| 3751 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3752 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; |
| 3753 | } |
| 3754 | |
| 3755 | return target; |
| 3756 | } |
| 3757 | |
| 3758 | /* |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3759 | * @flags: available profiles in extended format (see ctree.h) |
| 3760 | * |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3761 | * Returns reduced profile in chunk format. If profile changing is in |
| 3762 | * progress (either running or paused) picks the target profile (if it's |
| 3763 | * already available), otherwise falls back to plain reducing. |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3764 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 3765 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3766 | { |
Miao Xie | 9566997 | 2014-07-24 11:37:14 +0800 | [diff] [blame] | 3767 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3768 | u64 target; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3769 | u64 tmp; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3770 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3771 | /* |
| 3772 | * see if restripe for this chunk_type is in progress, if so |
| 3773 | * try to reduce to the target profile |
| 3774 | */ |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3775 | spin_lock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3776 | target = get_restripe_target(root->fs_info, flags); |
| 3777 | if (target) { |
| 3778 | /* pick target profile only if it's already available */ |
| 3779 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3780 | spin_unlock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3781 | return extended_to_chunk(target); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3782 | } |
| 3783 | } |
| 3784 | spin_unlock(&root->fs_info->balance_lock); |
| 3785 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3786 | /* First, mask out the RAID levels which aren't possible */ |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3787 | if (num_devices == 1) |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3788 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
| 3789 | BTRFS_BLOCK_GROUP_RAID5); |
| 3790 | if (num_devices < 3) |
| 3791 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3792 | if (num_devices < 4) |
| 3793 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 3794 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3795 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
| 3796 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | |
| 3797 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); |
| 3798 | flags &= ~tmp; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3799 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3800 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
| 3801 | tmp = BTRFS_BLOCK_GROUP_RAID6; |
| 3802 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) |
| 3803 | tmp = BTRFS_BLOCK_GROUP_RAID5; |
| 3804 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) |
| 3805 | tmp = BTRFS_BLOCK_GROUP_RAID10; |
| 3806 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) |
| 3807 | tmp = BTRFS_BLOCK_GROUP_RAID1; |
| 3808 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) |
| 3809 | tmp = BTRFS_BLOCK_GROUP_RAID0; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3810 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3811 | return extended_to_chunk(flags | tmp); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3812 | } |
| 3813 | |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3814 | static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3815 | { |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3816 | unsigned seq; |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3817 | u64 flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3818 | |
| 3819 | do { |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3820 | flags = orig_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3821 | seq = read_seqbegin(&root->fs_info->profiles_lock); |
| 3822 | |
| 3823 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3824 | flags |= root->fs_info->avail_data_alloc_bits; |
| 3825 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3826 | flags |= root->fs_info->avail_system_alloc_bits; |
| 3827 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3828 | flags |= root->fs_info->avail_metadata_alloc_bits; |
| 3829 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); |
Ilya Dryomov | 6fef8df | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3830 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3831 | return btrfs_reduce_alloc_profile(root, flags); |
| 3832 | } |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3833 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 3834 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3835 | { |
| 3836 | u64 flags; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3837 | u64 ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3838 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3839 | if (data) |
| 3840 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 3841 | else if (root == root->fs_info->chunk_root) |
| 3842 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 3843 | else |
| 3844 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 3845 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3846 | ret = get_alloc_profile(root, flags); |
| 3847 | return ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3848 | } |
| 3849 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3850 | /* |
| 3851 | * This will check the space that the inode allocates from to make sure we have |
| 3852 | * enough space for bytes. |
| 3853 | */ |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 3854 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3855 | { |
| 3856 | struct btrfs_space_info *data_sinfo; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3857 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3858 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3859 | u64 used; |
Zhao Lei | 94b947b | 2015-02-14 13:23:45 +0800 | [diff] [blame] | 3860 | int ret = 0; |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3861 | int need_commit = 2; |
| 3862 | int have_pinned_space; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3863 | |
| 3864 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3865 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3866 | |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3867 | if (btrfs_is_free_space_inode(inode)) { |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3868 | need_commit = 0; |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3869 | ASSERT(current->journal_info); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3870 | } |
| 3871 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3872 | data_sinfo = fs_info->data_sinfo; |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3873 | if (!data_sinfo) |
| 3874 | goto alloc; |
| 3875 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3876 | again: |
| 3877 | /* make sure we have enough space to handle the data first */ |
| 3878 | spin_lock(&data_sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3879 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
| 3880 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + |
| 3881 | data_sinfo->bytes_may_use; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3882 | |
| 3883 | if (used + bytes > data_sinfo->total_bytes) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3884 | struct btrfs_trans_handle *trans; |
| 3885 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3886 | /* |
| 3887 | * if we don't have enough free bytes in this space then we need |
| 3888 | * to alloc a new chunk. |
| 3889 | */ |
Zhao Lei | b9fd47c | 2015-02-09 14:40:20 +0800 | [diff] [blame] | 3890 | if (!data_sinfo->full) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3891 | u64 alloc_target; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3892 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3893 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3894 | spin_unlock(&data_sinfo->lock); |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3895 | alloc: |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3896 | alloc_target = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3897 | /* |
| 3898 | * It is ugly that we don't call nolock join |
| 3899 | * transaction for the free space inode case here. |
| 3900 | * But it is safe because we only do the data space |
| 3901 | * reservation for the free space cache in the |
| 3902 | * transaction context, the common join transaction |
| 3903 | * just increase the counter of the current transaction |
| 3904 | * handler, doesn't try to acquire the trans_lock of |
| 3905 | * the fs. |
| 3906 | */ |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3907 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3908 | if (IS_ERR(trans)) |
| 3909 | return PTR_ERR(trans); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3910 | |
| 3911 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3912 | alloc_target, |
| 3913 | CHUNK_ALLOC_NO_FORCE); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3914 | btrfs_end_transaction(trans, root); |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3915 | if (ret < 0) { |
| 3916 | if (ret != -ENOSPC) |
| 3917 | return ret; |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3918 | else { |
| 3919 | have_pinned_space = 1; |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3920 | goto commit_trans; |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3921 | } |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3922 | } |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3923 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3924 | if (!data_sinfo) |
| 3925 | data_sinfo = fs_info->data_sinfo; |
| 3926 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3927 | goto again; |
| 3928 | } |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3929 | |
| 3930 | /* |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3931 | * If we don't have enough pinned space to deal with this |
Zhao Lei | 94b947b | 2015-02-14 13:23:45 +0800 | [diff] [blame] | 3932 | * allocation, and no removed chunk in current transaction, |
| 3933 | * don't bother committing the transaction. |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3934 | */ |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3935 | have_pinned_space = percpu_counter_compare( |
| 3936 | &data_sinfo->total_bytes_pinned, |
| 3937 | used + bytes - data_sinfo->total_bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3938 | spin_unlock(&data_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3939 | |
| 3940 | /* commit the current transaction and try again */ |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3941 | commit_trans: |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3942 | if (need_commit && |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3943 | !atomic_read(&root->fs_info->open_ioctl_trans)) { |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3944 | need_commit--; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3945 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3946 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3947 | if (IS_ERR(trans)) |
| 3948 | return PTR_ERR(trans); |
Zhao Lei | c99f1b0 | 2015-03-02 19:32:20 +0800 | [diff] [blame] | 3949 | if (have_pinned_space >= 0 || |
| 3950 | trans->transaction->have_free_bgs || |
| 3951 | need_commit > 0) { |
Zhao Lei | 94b947b | 2015-02-14 13:23:45 +0800 | [diff] [blame] | 3952 | ret = btrfs_commit_transaction(trans, root); |
| 3953 | if (ret) |
| 3954 | return ret; |
Zhao Lei | d7c1517 | 2015-02-26 10:49:20 +0800 | [diff] [blame] | 3955 | /* |
| 3956 | * make sure that all running delayed iput are |
| 3957 | * done |
| 3958 | */ |
| 3959 | down_write(&root->fs_info->delayed_iput_sem); |
| 3960 | up_write(&root->fs_info->delayed_iput_sem); |
Zhao Lei | 94b947b | 2015-02-14 13:23:45 +0800 | [diff] [blame] | 3961 | goto again; |
| 3962 | } else { |
| 3963 | btrfs_end_transaction(trans, root); |
| 3964 | } |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3965 | } |
| 3966 | |
Jeff Mahoney | cab45e2 | 2013-10-16 16:27:01 -0400 | [diff] [blame] | 3967 | trace_btrfs_space_reservation(root->fs_info, |
| 3968 | "space_info:enospc", |
| 3969 | data_sinfo->flags, bytes, 1); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3970 | return -ENOSPC; |
| 3971 | } |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 3972 | ret = btrfs_qgroup_reserve(root, write_bytes); |
Dongsheng Yang | 237c0e9 | 2014-12-29 06:23:05 -0500 | [diff] [blame] | 3973 | if (ret) |
| 3974 | goto out; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3975 | data_sinfo->bytes_may_use += bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3976 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3977 | data_sinfo->flags, bytes, 1); |
Dongsheng Yang | 237c0e9 | 2014-12-29 06:23:05 -0500 | [diff] [blame] | 3978 | out: |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3979 | spin_unlock(&data_sinfo->lock); |
| 3980 | |
Dongsheng Yang | 237c0e9 | 2014-12-29 06:23:05 -0500 | [diff] [blame] | 3981 | return ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3982 | } |
| 3983 | |
| 3984 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3985 | * Called if we need to clear a data reservation for this inode. |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3986 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3987 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3988 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3989 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3990 | struct btrfs_space_info *data_sinfo; |
| 3991 | |
| 3992 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3993 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3994 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3995 | data_sinfo = root->fs_info->data_sinfo; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3996 | spin_lock(&data_sinfo->lock); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 3997 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3998 | data_sinfo->bytes_may_use -= bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3999 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4000 | data_sinfo->flags, bytes, 0); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4001 | spin_unlock(&data_sinfo->lock); |
| 4002 | } |
| 4003 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4004 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
| 4005 | { |
| 4006 | struct list_head *head = &info->space_info; |
| 4007 | struct btrfs_space_info *found; |
| 4008 | |
| 4009 | rcu_read_lock(); |
| 4010 | list_for_each_entry_rcu(found, head, list) { |
| 4011 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4012 | found->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4013 | } |
| 4014 | rcu_read_unlock(); |
| 4015 | } |
| 4016 | |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4017 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
| 4018 | { |
| 4019 | return (global->size << 1); |
| 4020 | } |
| 4021 | |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 4022 | static int should_alloc_chunk(struct btrfs_root *root, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 4023 | struct btrfs_space_info *sinfo, int force) |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4024 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4025 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4026 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4027 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 4028 | u64 thresh; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4029 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4030 | if (force == CHUNK_ALLOC_FORCE) |
| 4031 | return 1; |
| 4032 | |
| 4033 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4034 | * We need to take into account the global rsv because for all intents |
| 4035 | * and purposes it's used space. Don't worry about locking the |
| 4036 | * global_rsv, it doesn't change except when the transaction commits. |
| 4037 | */ |
Josef Bacik | 54338b5 | 2012-08-14 16:20:52 -0400 | [diff] [blame] | 4038 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4039 | num_allocated += calc_global_rsv_need_space(global_rsv); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4040 | |
| 4041 | /* |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4042 | * in limited mode, we want to have some free space up to |
| 4043 | * about 1% of the FS size. |
| 4044 | */ |
| 4045 | if (force == CHUNK_ALLOC_LIMITED) { |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 4046 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4047 | thresh = max_t(u64, 64 * 1024 * 1024, |
| 4048 | div_factor_fine(thresh, 1)); |
| 4049 | |
| 4050 | if (num_bytes - num_allocated < thresh) |
| 4051 | return 1; |
| 4052 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4053 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 4054 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
Josef Bacik | 14ed0ca | 2010-10-15 15:23:48 -0400 | [diff] [blame] | 4055 | return 0; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4056 | return 1; |
| 4057 | } |
| 4058 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4059 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
| 4060 | { |
| 4061 | u64 num_dev; |
| 4062 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 4063 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
| 4064 | BTRFS_BLOCK_GROUP_RAID0 | |
| 4065 | BTRFS_BLOCK_GROUP_RAID5 | |
| 4066 | BTRFS_BLOCK_GROUP_RAID6)) |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4067 | num_dev = root->fs_info->fs_devices->rw_devices; |
| 4068 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
| 4069 | num_dev = 2; |
| 4070 | else |
| 4071 | num_dev = 1; /* DUP or single */ |
| 4072 | |
| 4073 | /* metadata for updaing devices and chunk tree */ |
| 4074 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); |
| 4075 | } |
| 4076 | |
| 4077 | static void check_system_chunk(struct btrfs_trans_handle *trans, |
| 4078 | struct btrfs_root *root, u64 type) |
| 4079 | { |
| 4080 | struct btrfs_space_info *info; |
| 4081 | u64 left; |
| 4082 | u64 thresh; |
| 4083 | |
| 4084 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 4085 | spin_lock(&info->lock); |
| 4086 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 4087 | info->bytes_reserved - info->bytes_readonly; |
| 4088 | spin_unlock(&info->lock); |
| 4089 | |
| 4090 | thresh = get_system_chunk_thresh(root, type); |
| 4091 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 4092 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
| 4093 | left, thresh, type); |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4094 | dump_space_info(info, 0, 0); |
| 4095 | } |
| 4096 | |
| 4097 | if (left < thresh) { |
| 4098 | u64 flags; |
| 4099 | |
| 4100 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); |
| 4101 | btrfs_alloc_chunk(trans, root, flags); |
| 4102 | } |
| 4103 | } |
| 4104 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4105 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 4106 | struct btrfs_root *extent_root, u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4107 | { |
| 4108 | struct btrfs_space_info *space_info; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4109 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4110 | int wait_for_alloc = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 4111 | int ret = 0; |
| 4112 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 4113 | /* Don't re-enter if we're already allocating a chunk */ |
| 4114 | if (trans->allocating_chunk) |
| 4115 | return -ENOSPC; |
| 4116 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4117 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 4118 | if (!space_info) { |
| 4119 | ret = update_space_info(extent_root->fs_info, flags, |
| 4120 | 0, 0, &space_info); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4121 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 4122 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4123 | BUG_ON(!space_info); /* Logic error */ |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4124 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4125 | again: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4126 | spin_lock(&space_info->lock); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 4127 | if (force < space_info->force_alloc) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4128 | force = space_info->force_alloc; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4129 | if (space_info->full) { |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 4130 | if (should_alloc_chunk(extent_root, space_info, force)) |
| 4131 | ret = -ENOSPC; |
| 4132 | else |
| 4133 | ret = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4134 | spin_unlock(&space_info->lock); |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 4135 | return ret; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4136 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4137 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 4138 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4139 | spin_unlock(&space_info->lock); |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4140 | return 0; |
| 4141 | } else if (space_info->chunk_alloc) { |
| 4142 | wait_for_alloc = 1; |
| 4143 | } else { |
| 4144 | space_info->chunk_alloc = 1; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4145 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4146 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4147 | spin_unlock(&space_info->lock); |
| 4148 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4149 | mutex_lock(&fs_info->chunk_mutex); |
| 4150 | |
| 4151 | /* |
| 4152 | * The chunk_mutex is held throughout the entirety of a chunk |
| 4153 | * allocation, so once we've acquired the chunk_mutex we know that the |
| 4154 | * other guy is done and we need to recheck and see if we should |
| 4155 | * allocate. |
| 4156 | */ |
| 4157 | if (wait_for_alloc) { |
| 4158 | mutex_unlock(&fs_info->chunk_mutex); |
| 4159 | wait_for_alloc = 0; |
| 4160 | goto again; |
| 4161 | } |
| 4162 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 4163 | trans->allocating_chunk = true; |
| 4164 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4165 | /* |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 4166 | * If we have mixed data/metadata chunks we want to make sure we keep |
| 4167 | * allocating mixed chunks instead of individual chunks. |
| 4168 | */ |
| 4169 | if (btrfs_mixed_space_info(space_info)) |
| 4170 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); |
| 4171 | |
| 4172 | /* |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4173 | * if we're doing a data chunk, go ahead and make sure that |
| 4174 | * we keep a reasonable number of metadata chunks allocated in the |
| 4175 | * FS as well. |
| 4176 | */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4177 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 4178 | fs_info->data_chunk_allocations++; |
| 4179 | if (!(fs_info->data_chunk_allocations % |
| 4180 | fs_info->metadata_ratio)) |
| 4181 | force_metadata_allocation(fs_info); |
| 4182 | } |
| 4183 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4184 | /* |
| 4185 | * Check if we have enough space in SYSTEM chunk because we may need |
| 4186 | * to update devices. |
| 4187 | */ |
| 4188 | check_system_chunk(trans, extent_root, flags); |
| 4189 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 4190 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 4191 | trans->allocating_chunk = false; |
Mark Fasheh | 92b8e897 | 2011-07-12 10:57:59 -0700 | [diff] [blame] | 4192 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4193 | spin_lock(&space_info->lock); |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 4194 | if (ret < 0 && ret != -ENOSPC) |
| 4195 | goto out; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4196 | if (ret) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4197 | space_info->full = 1; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4198 | else |
| 4199 | ret = 1; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4200 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4201 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 4202 | out: |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4203 | space_info->chunk_alloc = 0; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4204 | spin_unlock(&space_info->lock); |
Dan Carpenter | a25c75d | 2012-04-18 09:59:29 +0300 | [diff] [blame] | 4205 | mutex_unlock(&fs_info->chunk_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 4206 | return ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4207 | } |
| 4208 | |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4209 | static int can_overcommit(struct btrfs_root *root, |
| 4210 | struct btrfs_space_info *space_info, u64 bytes, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4211 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4212 | { |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4213 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4214 | u64 profile = btrfs_get_alloc_profile(root, 0); |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4215 | u64 space_size; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4216 | u64 avail; |
| 4217 | u64 used; |
| 4218 | |
| 4219 | used = space_info->bytes_used + space_info->bytes_reserved + |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4220 | space_info->bytes_pinned + space_info->bytes_readonly; |
| 4221 | |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4222 | /* |
| 4223 | * We only want to allow over committing if we have lots of actual space |
| 4224 | * free, but if we don't have enough space to handle the global reserve |
| 4225 | * space then we could end up having a real enospc problem when trying |
| 4226 | * to allocate a chunk or some other such important allocation. |
| 4227 | */ |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4228 | spin_lock(&global_rsv->lock); |
| 4229 | space_size = calc_global_rsv_need_space(global_rsv); |
| 4230 | spin_unlock(&global_rsv->lock); |
| 4231 | if (used + space_size >= space_info->total_bytes) |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4232 | return 0; |
| 4233 | |
| 4234 | used += space_info->bytes_may_use; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4235 | |
| 4236 | spin_lock(&root->fs_info->free_chunk_lock); |
| 4237 | avail = root->fs_info->free_chunk_space; |
| 4238 | spin_unlock(&root->fs_info->free_chunk_lock); |
| 4239 | |
| 4240 | /* |
| 4241 | * If we have dup, raid1 or raid10 then only half of the free |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 4242 | * space is actually useable. For raid56, the space info used |
| 4243 | * doesn't include the parity drive, so we don't have to |
| 4244 | * change the math |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4245 | */ |
| 4246 | if (profile & (BTRFS_BLOCK_GROUP_DUP | |
| 4247 | BTRFS_BLOCK_GROUP_RAID1 | |
| 4248 | BTRFS_BLOCK_GROUP_RAID10)) |
| 4249 | avail >>= 1; |
| 4250 | |
| 4251 | /* |
Miao Xie | 561c294 | 2012-10-16 11:32:18 +0000 | [diff] [blame] | 4252 | * If we aren't flushing all things, let us overcommit up to |
| 4253 | * 1/2th of the space. If we can flush, don't let us overcommit |
| 4254 | * too much, let it overcommit up to 1/8 of the space. |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4255 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4256 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4257 | avail >>= 3; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4258 | else |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4259 | avail >>= 1; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4260 | |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4261 | if (used + bytes < space_info->total_bytes + avail) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4262 | return 1; |
| 4263 | return 0; |
| 4264 | } |
| 4265 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 4266 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4267 | unsigned long nr_pages, int nr_items) |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4268 | { |
| 4269 | struct super_block *sb = root->fs_info->sb; |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4270 | |
Josef Bacik | 925a6ef | 2013-06-20 12:31:27 -0400 | [diff] [blame] | 4271 | if (down_read_trylock(&sb->s_umount)) { |
| 4272 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); |
| 4273 | up_read(&sb->s_umount); |
| 4274 | } else { |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4275 | /* |
| 4276 | * We needn't worry the filesystem going from r/w to r/o though |
| 4277 | * we don't acquire ->s_umount mutex, because the filesystem |
| 4278 | * should guarantee the delalloc inodes list be empty after |
| 4279 | * the filesystem is readonly(all dirty pages are written to |
| 4280 | * the disk). |
| 4281 | */ |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4282 | btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); |
Josef Bacik | 98ad69c | 2013-04-04 11:55:49 -0400 | [diff] [blame] | 4283 | if (!current->journal_info) |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4284 | btrfs_wait_ordered_roots(root->fs_info, nr_items); |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4285 | } |
| 4286 | } |
| 4287 | |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4288 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) |
| 4289 | { |
| 4290 | u64 bytes; |
| 4291 | int nr; |
| 4292 | |
| 4293 | bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 4294 | nr = (int)div64_u64(to_reclaim, bytes); |
| 4295 | if (!nr) |
| 4296 | nr = 1; |
| 4297 | return nr; |
| 4298 | } |
| 4299 | |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4300 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) |
| 4301 | |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4302 | /* |
| 4303 | * shrink metadata reservation for delalloc |
| 4304 | */ |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4305 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
| 4306 | bool wait_ordered) |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4307 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4308 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4309 | struct btrfs_space_info *space_info; |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4310 | struct btrfs_trans_handle *trans; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4311 | u64 delalloc_bytes; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4312 | u64 max_reclaim; |
Josef Bacik | b1953bc | 2011-01-21 21:10:01 +0000 | [diff] [blame] | 4313 | long time_left; |
Miao Xie | d3ee29e | 2013-11-04 23:13:20 +0800 | [diff] [blame] | 4314 | unsigned long nr_pages; |
| 4315 | int loops; |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4316 | int items; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4317 | enum btrfs_reserve_flush_enum flush; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4318 | |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4319 | /* Calc the number of the pages we need flush for space reservation */ |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4320 | items = calc_reclaim_items_nr(root, to_reclaim); |
| 4321 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4322 | |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4323 | trans = (struct btrfs_trans_handle *)current->journal_info; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4324 | block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4325 | space_info = block_rsv->space_info; |
Chris Mason | bf9022e | 2010-10-26 13:40:45 -0400 | [diff] [blame] | 4326 | |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4327 | delalloc_bytes = percpu_counter_sum_positive( |
| 4328 | &root->fs_info->delalloc_bytes); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4329 | if (delalloc_bytes == 0) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4330 | if (trans) |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4331 | return; |
Miao Xie | 38c135a | 2013-11-04 23:13:21 +0800 | [diff] [blame] | 4332 | if (wait_ordered) |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4333 | btrfs_wait_ordered_roots(root->fs_info, items); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4334 | return; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4335 | } |
| 4336 | |
Miao Xie | d3ee29e | 2013-11-04 23:13:20 +0800 | [diff] [blame] | 4337 | loops = 0; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4338 | while (delalloc_bytes && loops < 3) { |
| 4339 | max_reclaim = min(delalloc_bytes, to_reclaim); |
| 4340 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4341 | btrfs_writeback_inodes_sb_nr(root, nr_pages, items); |
Josef Bacik | dea31f5 | 2012-09-06 16:47:00 -0400 | [diff] [blame] | 4342 | /* |
| 4343 | * We need to wait for the async pages to actually start before |
| 4344 | * we do anything. |
| 4345 | */ |
Miao Xie | 9f3a074 | 2013-11-04 23:13:24 +0800 | [diff] [blame] | 4346 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); |
| 4347 | if (!max_reclaim) |
| 4348 | goto skip_async; |
Josef Bacik | dea31f5 | 2012-09-06 16:47:00 -0400 | [diff] [blame] | 4349 | |
Miao Xie | 9f3a074 | 2013-11-04 23:13:24 +0800 | [diff] [blame] | 4350 | if (max_reclaim <= nr_pages) |
| 4351 | max_reclaim = 0; |
| 4352 | else |
| 4353 | max_reclaim -= nr_pages; |
| 4354 | |
| 4355 | wait_event(root->fs_info->async_submit_wait, |
| 4356 | atomic_read(&root->fs_info->async_delalloc_pages) <= |
| 4357 | (int)max_reclaim); |
| 4358 | skip_async: |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4359 | if (!trans) |
| 4360 | flush = BTRFS_RESERVE_FLUSH_ALL; |
| 4361 | else |
| 4362 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4363 | spin_lock(&space_info->lock); |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4364 | if (can_overcommit(root, space_info, orig, flush)) { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4365 | spin_unlock(&space_info->lock); |
| 4366 | break; |
| 4367 | } |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4368 | spin_unlock(&space_info->lock); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4369 | |
Chris Mason | 36e39c4 | 2011-03-12 07:08:42 -0500 | [diff] [blame] | 4370 | loops++; |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4371 | if (wait_ordered && !trans) { |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4372 | btrfs_wait_ordered_roots(root->fs_info, items); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4373 | } else { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4374 | time_left = schedule_timeout_killable(1); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4375 | if (time_left) |
| 4376 | break; |
| 4377 | } |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4378 | delalloc_bytes = percpu_counter_sum_positive( |
| 4379 | &root->fs_info->delalloc_bytes); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4380 | } |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4381 | } |
| 4382 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4383 | /** |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4384 | * maybe_commit_transaction - possibly commit the transaction if its ok to |
| 4385 | * @root - the root we're allocating for |
| 4386 | * @bytes - the number of bytes we want to reserve |
| 4387 | * @force - force the commit |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4388 | * |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4389 | * This will check to make sure that committing the transaction will actually |
| 4390 | * get us somewhere and then commit the transaction if it does. Otherwise it |
| 4391 | * will return -ENOSPC. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4392 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4393 | static int may_commit_transaction(struct btrfs_root *root, |
| 4394 | struct btrfs_space_info *space_info, |
| 4395 | u64 bytes, int force) |
| 4396 | { |
| 4397 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; |
| 4398 | struct btrfs_trans_handle *trans; |
| 4399 | |
| 4400 | trans = (struct btrfs_trans_handle *)current->journal_info; |
| 4401 | if (trans) |
| 4402 | return -EAGAIN; |
| 4403 | |
| 4404 | if (force) |
| 4405 | goto commit; |
| 4406 | |
| 4407 | /* See if there is enough pinned space to make this reservation */ |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4408 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
Miao Xie | 0424c54 | 2014-03-06 13:54:59 +0800 | [diff] [blame] | 4409 | bytes) >= 0) |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4410 | goto commit; |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4411 | |
| 4412 | /* |
| 4413 | * See if there is some space in the delayed insertion reservation for |
| 4414 | * this reservation. |
| 4415 | */ |
| 4416 | if (space_info != delayed_rsv->space_info) |
| 4417 | return -ENOSPC; |
| 4418 | |
| 4419 | spin_lock(&delayed_rsv->lock); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4420 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
| 4421 | bytes - delayed_rsv->size) >= 0) { |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4422 | spin_unlock(&delayed_rsv->lock); |
| 4423 | return -ENOSPC; |
| 4424 | } |
| 4425 | spin_unlock(&delayed_rsv->lock); |
| 4426 | |
| 4427 | commit: |
| 4428 | trans = btrfs_join_transaction(root); |
| 4429 | if (IS_ERR(trans)) |
| 4430 | return -ENOSPC; |
| 4431 | |
| 4432 | return btrfs_commit_transaction(trans, root); |
| 4433 | } |
| 4434 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4435 | enum flush_state { |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4436 | FLUSH_DELAYED_ITEMS_NR = 1, |
| 4437 | FLUSH_DELAYED_ITEMS = 2, |
| 4438 | FLUSH_DELALLOC = 3, |
| 4439 | FLUSH_DELALLOC_WAIT = 4, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4440 | ALLOC_CHUNK = 5, |
| 4441 | COMMIT_TRANS = 6, |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4442 | }; |
| 4443 | |
| 4444 | static int flush_space(struct btrfs_root *root, |
| 4445 | struct btrfs_space_info *space_info, u64 num_bytes, |
| 4446 | u64 orig_bytes, int state) |
| 4447 | { |
| 4448 | struct btrfs_trans_handle *trans; |
| 4449 | int nr; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4450 | int ret = 0; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4451 | |
| 4452 | switch (state) { |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4453 | case FLUSH_DELAYED_ITEMS_NR: |
| 4454 | case FLUSH_DELAYED_ITEMS: |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4455 | if (state == FLUSH_DELAYED_ITEMS_NR) |
| 4456 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; |
| 4457 | else |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4458 | nr = -1; |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4459 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4460 | trans = btrfs_join_transaction(root); |
| 4461 | if (IS_ERR(trans)) { |
| 4462 | ret = PTR_ERR(trans); |
| 4463 | break; |
| 4464 | } |
| 4465 | ret = btrfs_run_delayed_items_nr(trans, root, nr); |
| 4466 | btrfs_end_transaction(trans, root); |
| 4467 | break; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4468 | case FLUSH_DELALLOC: |
| 4469 | case FLUSH_DELALLOC_WAIT: |
Miao Xie | 24af7dd | 2014-03-06 13:55:00 +0800 | [diff] [blame] | 4470 | shrink_delalloc(root, num_bytes * 2, orig_bytes, |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4471 | state == FLUSH_DELALLOC_WAIT); |
| 4472 | break; |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4473 | case ALLOC_CHUNK: |
| 4474 | trans = btrfs_join_transaction(root); |
| 4475 | if (IS_ERR(trans)) { |
| 4476 | ret = PTR_ERR(trans); |
| 4477 | break; |
| 4478 | } |
| 4479 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4480 | btrfs_get_alloc_profile(root, 0), |
| 4481 | CHUNK_ALLOC_NO_FORCE); |
| 4482 | btrfs_end_transaction(trans, root); |
| 4483 | if (ret == -ENOSPC) |
| 4484 | ret = 0; |
| 4485 | break; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4486 | case COMMIT_TRANS: |
| 4487 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); |
| 4488 | break; |
| 4489 | default: |
| 4490 | ret = -ENOSPC; |
| 4491 | break; |
| 4492 | } |
| 4493 | |
| 4494 | return ret; |
| 4495 | } |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4496 | |
| 4497 | static inline u64 |
| 4498 | btrfs_calc_reclaim_metadata_size(struct btrfs_root *root, |
| 4499 | struct btrfs_space_info *space_info) |
| 4500 | { |
| 4501 | u64 used; |
| 4502 | u64 expected; |
| 4503 | u64 to_reclaim; |
| 4504 | |
| 4505 | to_reclaim = min_t(u64, num_online_cpus() * 1024 * 1024, |
| 4506 | 16 * 1024 * 1024); |
| 4507 | spin_lock(&space_info->lock); |
| 4508 | if (can_overcommit(root, space_info, to_reclaim, |
| 4509 | BTRFS_RESERVE_FLUSH_ALL)) { |
| 4510 | to_reclaim = 0; |
| 4511 | goto out; |
| 4512 | } |
| 4513 | |
| 4514 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4515 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4516 | space_info->bytes_may_use; |
| 4517 | if (can_overcommit(root, space_info, 1024 * 1024, |
| 4518 | BTRFS_RESERVE_FLUSH_ALL)) |
| 4519 | expected = div_factor_fine(space_info->total_bytes, 95); |
| 4520 | else |
| 4521 | expected = div_factor_fine(space_info->total_bytes, 90); |
| 4522 | |
| 4523 | if (used > expected) |
| 4524 | to_reclaim = used - expected; |
| 4525 | else |
| 4526 | to_reclaim = 0; |
| 4527 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + |
| 4528 | space_info->bytes_reserved); |
| 4529 | out: |
| 4530 | spin_unlock(&space_info->lock); |
| 4531 | |
| 4532 | return to_reclaim; |
| 4533 | } |
| 4534 | |
| 4535 | static inline int need_do_async_reclaim(struct btrfs_space_info *space_info, |
| 4536 | struct btrfs_fs_info *fs_info, u64 used) |
| 4537 | { |
Josef Bacik | 365c531 | 2015-02-18 13:58:15 -0800 | [diff] [blame] | 4538 | u64 thresh = div_factor_fine(space_info->total_bytes, 98); |
| 4539 | |
| 4540 | /* If we're just plain full then async reclaim just slows us down. */ |
| 4541 | if (space_info->bytes_used >= thresh) |
| 4542 | return 0; |
| 4543 | |
| 4544 | return (used >= thresh && !btrfs_fs_closing(fs_info) && |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4545 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); |
| 4546 | } |
| 4547 | |
| 4548 | static int btrfs_need_do_async_reclaim(struct btrfs_space_info *space_info, |
Liu Bo | 25ce459 | 2014-09-10 12:58:50 +0800 | [diff] [blame] | 4549 | struct btrfs_fs_info *fs_info, |
| 4550 | int flush_state) |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4551 | { |
| 4552 | u64 used; |
| 4553 | |
| 4554 | spin_lock(&space_info->lock); |
Liu Bo | 25ce459 | 2014-09-10 12:58:50 +0800 | [diff] [blame] | 4555 | /* |
| 4556 | * We run out of space and have not got any free space via flush_space, |
| 4557 | * so don't bother doing async reclaim. |
| 4558 | */ |
| 4559 | if (flush_state > COMMIT_TRANS && space_info->full) { |
| 4560 | spin_unlock(&space_info->lock); |
| 4561 | return 0; |
| 4562 | } |
| 4563 | |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4564 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4565 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4566 | space_info->bytes_may_use; |
| 4567 | if (need_do_async_reclaim(space_info, fs_info, used)) { |
| 4568 | spin_unlock(&space_info->lock); |
| 4569 | return 1; |
| 4570 | } |
| 4571 | spin_unlock(&space_info->lock); |
| 4572 | |
| 4573 | return 0; |
| 4574 | } |
| 4575 | |
| 4576 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) |
| 4577 | { |
| 4578 | struct btrfs_fs_info *fs_info; |
| 4579 | struct btrfs_space_info *space_info; |
| 4580 | u64 to_reclaim; |
| 4581 | int flush_state; |
| 4582 | |
| 4583 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); |
| 4584 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
| 4585 | |
| 4586 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root, |
| 4587 | space_info); |
| 4588 | if (!to_reclaim) |
| 4589 | return; |
| 4590 | |
| 4591 | flush_state = FLUSH_DELAYED_ITEMS_NR; |
| 4592 | do { |
| 4593 | flush_space(fs_info->fs_root, space_info, to_reclaim, |
| 4594 | to_reclaim, flush_state); |
| 4595 | flush_state++; |
Liu Bo | 25ce459 | 2014-09-10 12:58:50 +0800 | [diff] [blame] | 4596 | if (!btrfs_need_do_async_reclaim(space_info, fs_info, |
| 4597 | flush_state)) |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4598 | return; |
Josef Bacik | 365c531 | 2015-02-18 13:58:15 -0800 | [diff] [blame] | 4599 | } while (flush_state < COMMIT_TRANS); |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4600 | } |
| 4601 | |
| 4602 | void btrfs_init_async_reclaim_work(struct work_struct *work) |
| 4603 | { |
| 4604 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); |
| 4605 | } |
| 4606 | |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4607 | /** |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4608 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space |
| 4609 | * @root - the root we're allocating for |
| 4610 | * @block_rsv - the block_rsv we're allocating for |
| 4611 | * @orig_bytes - the number of bytes we want |
Adam Buchbinder | 48fc7f7 | 2012-09-19 21:48:00 -0400 | [diff] [blame] | 4612 | * @flush - whether or not we can flush to make our reservation |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4613 | * |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4614 | * This will reserve orgi_bytes number of bytes from the space info associated |
| 4615 | * with the block_rsv. If there is not enough space it will make an attempt to |
| 4616 | * flush out space to make room. It will do this by flushing delalloc if |
| 4617 | * possible or committing the transaction. If flush is 0 then no attempts to |
| 4618 | * regain reservations will be made and this will fail if there is not enough |
| 4619 | * space already. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4620 | */ |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4621 | static int reserve_metadata_bytes(struct btrfs_root *root, |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4622 | struct btrfs_block_rsv *block_rsv, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4623 | u64 orig_bytes, |
| 4624 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4625 | { |
| 4626 | struct btrfs_space_info *space_info = block_rsv->space_info; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4627 | u64 used; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4628 | u64 num_bytes = orig_bytes; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4629 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4630 | int ret = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4631 | bool flushing = false; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4632 | |
| 4633 | again: |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4634 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4635 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4636 | /* |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4637 | * We only want to wait if somebody other than us is flushing and we |
| 4638 | * are actually allowed to flush all things. |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4639 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4640 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
| 4641 | space_info->flush) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4642 | spin_unlock(&space_info->lock); |
| 4643 | /* |
| 4644 | * If we have a trans handle we can't wait because the flusher |
| 4645 | * may have to commit the transaction, which would mean we would |
| 4646 | * deadlock since we are waiting for the flusher to finish, but |
| 4647 | * hold the current transaction open. |
| 4648 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4649 | if (current->journal_info) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4650 | return -EAGAIN; |
Arne Jansen | b9688bb | 2012-04-18 10:27:16 +0200 | [diff] [blame] | 4651 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
| 4652 | /* Must have been killed, return */ |
| 4653 | if (ret) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4654 | return -EINTR; |
| 4655 | |
| 4656 | spin_lock(&space_info->lock); |
| 4657 | } |
| 4658 | |
| 4659 | ret = -ENOSPC; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4660 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4661 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4662 | space_info->bytes_may_use; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4663 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4664 | /* |
| 4665 | * The idea here is that we've not already over-reserved the block group |
| 4666 | * then we can go ahead and save our reservation first and then start |
| 4667 | * flushing if we need to. Otherwise if we've already overcommitted |
| 4668 | * lets start flushing stuff first and then come back and try to make |
| 4669 | * our reservation. |
| 4670 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4671 | if (used <= space_info->total_bytes) { |
| 4672 | if (used + orig_bytes <= space_info->total_bytes) { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4673 | space_info->bytes_may_use += orig_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4674 | trace_btrfs_space_reservation(root->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4675 | "space_info", space_info->flags, orig_bytes, 1); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4676 | ret = 0; |
| 4677 | } else { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4678 | /* |
| 4679 | * Ok set num_bytes to orig_bytes since we aren't |
| 4680 | * overocmmitted, this way we only try and reclaim what |
| 4681 | * we need. |
| 4682 | */ |
| 4683 | num_bytes = orig_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4684 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4685 | } else { |
| 4686 | /* |
| 4687 | * Ok we're over committed, set num_bytes to the overcommitted |
| 4688 | * amount plus the amount of bytes that we need for this |
| 4689 | * reservation. |
| 4690 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4691 | num_bytes = used - space_info->total_bytes + |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4692 | (orig_bytes * 2); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4693 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4694 | |
Josef Bacik | 44734ed | 2012-09-28 16:04:19 -0400 | [diff] [blame] | 4695 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
| 4696 | space_info->bytes_may_use += orig_bytes; |
| 4697 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
| 4698 | space_info->flags, orig_bytes, |
| 4699 | 1); |
| 4700 | ret = 0; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4701 | } |
| 4702 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4703 | /* |
| 4704 | * Couldn't make our reservation, save our place so while we're trying |
| 4705 | * to reclaim space we can actually use it instead of somebody else |
| 4706 | * stealing it from us. |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4707 | * |
| 4708 | * We make the other tasks wait for the flush only when we can flush |
| 4709 | * all things. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4710 | */ |
Josef Bacik | 72bcd99 | 2012-12-18 15:16:34 -0500 | [diff] [blame] | 4711 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4712 | flushing = true; |
| 4713 | space_info->flush = 1; |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4714 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
| 4715 | used += orig_bytes; |
Josef Bacik | f6acfd5 | 2014-09-18 11:27:17 -0400 | [diff] [blame] | 4716 | /* |
| 4717 | * We will do the space reservation dance during log replay, |
| 4718 | * which means we won't have fs_info->fs_root set, so don't do |
| 4719 | * the async reclaim as we will panic. |
| 4720 | */ |
| 4721 | if (!root->fs_info->log_root_recovering && |
| 4722 | need_do_async_reclaim(space_info, root->fs_info, used) && |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4723 | !work_busy(&root->fs_info->async_reclaim_work)) |
| 4724 | queue_work(system_unbound_wq, |
| 4725 | &root->fs_info->async_reclaim_work); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4726 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4727 | spin_unlock(&space_info->lock); |
| 4728 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4729 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4730 | goto out; |
| 4731 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4732 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
| 4733 | flush_state); |
| 4734 | flush_state++; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4735 | |
| 4736 | /* |
| 4737 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock |
| 4738 | * would happen. So skip delalloc flush. |
| 4739 | */ |
| 4740 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4741 | (flush_state == FLUSH_DELALLOC || |
| 4742 | flush_state == FLUSH_DELALLOC_WAIT)) |
| 4743 | flush_state = ALLOC_CHUNK; |
| 4744 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4745 | if (!ret) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4746 | goto again; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4747 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4748 | flush_state < COMMIT_TRANS) |
| 4749 | goto again; |
| 4750 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && |
| 4751 | flush_state <= COMMIT_TRANS) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4752 | goto again; |
| 4753 | |
| 4754 | out: |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 4755 | if (ret == -ENOSPC && |
| 4756 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { |
| 4757 | struct btrfs_block_rsv *global_rsv = |
| 4758 | &root->fs_info->global_block_rsv; |
| 4759 | |
| 4760 | if (block_rsv != global_rsv && |
| 4761 | !block_rsv_use_bytes(global_rsv, orig_bytes)) |
| 4762 | ret = 0; |
| 4763 | } |
Jeff Mahoney | cab45e2 | 2013-10-16 16:27:01 -0400 | [diff] [blame] | 4764 | if (ret == -ENOSPC) |
| 4765 | trace_btrfs_space_reservation(root->fs_info, |
| 4766 | "space_info:enospc", |
| 4767 | space_info->flags, orig_bytes, 1); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4768 | if (flushing) { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4769 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4770 | space_info->flush = 0; |
| 4771 | wake_up_all(&space_info->wait); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4772 | spin_unlock(&space_info->lock); |
| 4773 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4774 | return ret; |
| 4775 | } |
| 4776 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4777 | static struct btrfs_block_rsv *get_block_rsv( |
| 4778 | const struct btrfs_trans_handle *trans, |
| 4779 | const struct btrfs_root *root) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4780 | { |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4781 | struct btrfs_block_rsv *block_rsv = NULL; |
| 4782 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 4783 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 4784 | block_rsv = trans->block_rsv; |
| 4785 | |
| 4786 | if (root == root->fs_info->csum_root && trans->adding_csums) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4787 | block_rsv = trans->block_rsv; |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4788 | |
Stefan Behrens | f7a81ea | 2013-08-15 17:11:19 +0200 | [diff] [blame] | 4789 | if (root == root->fs_info->uuid_root) |
| 4790 | block_rsv = trans->block_rsv; |
| 4791 | |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4792 | if (!block_rsv) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4793 | block_rsv = root->block_rsv; |
| 4794 | |
| 4795 | if (!block_rsv) |
| 4796 | block_rsv = &root->fs_info->empty_block_rsv; |
| 4797 | |
| 4798 | return block_rsv; |
| 4799 | } |
| 4800 | |
| 4801 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 4802 | u64 num_bytes) |
| 4803 | { |
| 4804 | int ret = -ENOSPC; |
| 4805 | spin_lock(&block_rsv->lock); |
| 4806 | if (block_rsv->reserved >= num_bytes) { |
| 4807 | block_rsv->reserved -= num_bytes; |
| 4808 | if (block_rsv->reserved < block_rsv->size) |
| 4809 | block_rsv->full = 0; |
| 4810 | ret = 0; |
| 4811 | } |
| 4812 | spin_unlock(&block_rsv->lock); |
| 4813 | return ret; |
| 4814 | } |
| 4815 | |
| 4816 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, |
| 4817 | u64 num_bytes, int update_size) |
| 4818 | { |
| 4819 | spin_lock(&block_rsv->lock); |
| 4820 | block_rsv->reserved += num_bytes; |
| 4821 | if (update_size) |
| 4822 | block_rsv->size += num_bytes; |
| 4823 | else if (block_rsv->reserved >= block_rsv->size) |
| 4824 | block_rsv->full = 1; |
| 4825 | spin_unlock(&block_rsv->lock); |
| 4826 | } |
| 4827 | |
Josef Bacik | d52be81 | 2013-05-29 14:54:47 -0400 | [diff] [blame] | 4828 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
| 4829 | struct btrfs_block_rsv *dest, u64 num_bytes, |
| 4830 | int min_factor) |
| 4831 | { |
| 4832 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
| 4833 | u64 min_bytes; |
| 4834 | |
| 4835 | if (global_rsv->space_info != dest->space_info) |
| 4836 | return -ENOSPC; |
| 4837 | |
| 4838 | spin_lock(&global_rsv->lock); |
| 4839 | min_bytes = div_factor(global_rsv->size, min_factor); |
| 4840 | if (global_rsv->reserved < min_bytes + num_bytes) { |
| 4841 | spin_unlock(&global_rsv->lock); |
| 4842 | return -ENOSPC; |
| 4843 | } |
| 4844 | global_rsv->reserved -= num_bytes; |
| 4845 | if (global_rsv->reserved < global_rsv->size) |
| 4846 | global_rsv->full = 0; |
| 4847 | spin_unlock(&global_rsv->lock); |
| 4848 | |
| 4849 | block_rsv_add_bytes(dest, num_bytes, 1); |
| 4850 | return 0; |
| 4851 | } |
| 4852 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4853 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
| 4854 | struct btrfs_block_rsv *block_rsv, |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 4855 | struct btrfs_block_rsv *dest, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4856 | { |
| 4857 | struct btrfs_space_info *space_info = block_rsv->space_info; |
| 4858 | |
| 4859 | spin_lock(&block_rsv->lock); |
| 4860 | if (num_bytes == (u64)-1) |
| 4861 | num_bytes = block_rsv->size; |
| 4862 | block_rsv->size -= num_bytes; |
| 4863 | if (block_rsv->reserved >= block_rsv->size) { |
| 4864 | num_bytes = block_rsv->reserved - block_rsv->size; |
| 4865 | block_rsv->reserved = block_rsv->size; |
| 4866 | block_rsv->full = 1; |
| 4867 | } else { |
| 4868 | num_bytes = 0; |
| 4869 | } |
| 4870 | spin_unlock(&block_rsv->lock); |
| 4871 | |
| 4872 | if (num_bytes > 0) { |
| 4873 | if (dest) { |
Josef Bacik | e9e2289 | 2011-01-24 21:43:19 +0000 | [diff] [blame] | 4874 | spin_lock(&dest->lock); |
| 4875 | if (!dest->full) { |
| 4876 | u64 bytes_to_add; |
| 4877 | |
| 4878 | bytes_to_add = dest->size - dest->reserved; |
| 4879 | bytes_to_add = min(num_bytes, bytes_to_add); |
| 4880 | dest->reserved += bytes_to_add; |
| 4881 | if (dest->reserved >= dest->size) |
| 4882 | dest->full = 1; |
| 4883 | num_bytes -= bytes_to_add; |
| 4884 | } |
| 4885 | spin_unlock(&dest->lock); |
| 4886 | } |
| 4887 | if (num_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4888 | spin_lock(&space_info->lock); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4889 | space_info->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4890 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4891 | space_info->flags, num_bytes, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4892 | spin_unlock(&space_info->lock); |
| 4893 | } |
| 4894 | } |
| 4895 | } |
| 4896 | |
| 4897 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
| 4898 | struct btrfs_block_rsv *dst, u64 num_bytes) |
| 4899 | { |
| 4900 | int ret; |
| 4901 | |
| 4902 | ret = block_rsv_use_bytes(src, num_bytes); |
| 4903 | if (ret) |
| 4904 | return ret; |
| 4905 | |
| 4906 | block_rsv_add_bytes(dst, num_bytes, 1); |
| 4907 | return 0; |
| 4908 | } |
| 4909 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4910 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4911 | { |
| 4912 | memset(rsv, 0, sizeof(*rsv)); |
| 4913 | spin_lock_init(&rsv->lock); |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4914 | rsv->type = type; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4915 | } |
| 4916 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4917 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
| 4918 | unsigned short type) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4919 | { |
| 4920 | struct btrfs_block_rsv *block_rsv; |
| 4921 | struct btrfs_fs_info *fs_info = root->fs_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4922 | |
| 4923 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
| 4924 | if (!block_rsv) |
| 4925 | return NULL; |
| 4926 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4927 | btrfs_init_block_rsv(block_rsv, type); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4928 | block_rsv->space_info = __find_space_info(fs_info, |
| 4929 | BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4930 | return block_rsv; |
| 4931 | } |
| 4932 | |
| 4933 | void btrfs_free_block_rsv(struct btrfs_root *root, |
| 4934 | struct btrfs_block_rsv *rsv) |
| 4935 | { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 4936 | if (!rsv) |
| 4937 | return; |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 4938 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
| 4939 | kfree(rsv); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4940 | } |
| 4941 | |
Chris Mason | cdfb080 | 2015-04-06 18:17:00 -0700 | [diff] [blame] | 4942 | void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv) |
| 4943 | { |
| 4944 | kfree(rsv); |
| 4945 | } |
| 4946 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4947 | int btrfs_block_rsv_add(struct btrfs_root *root, |
| 4948 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, |
| 4949 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4950 | { |
| 4951 | int ret; |
| 4952 | |
| 4953 | if (num_bytes == 0) |
| 4954 | return 0; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4955 | |
Miao Xie | 61b520a | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 4956 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4957 | if (!ret) { |
| 4958 | block_rsv_add_bytes(block_rsv, num_bytes, 1); |
| 4959 | return 0; |
| 4960 | } |
| 4961 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4962 | return ret; |
| 4963 | } |
| 4964 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4965 | int btrfs_block_rsv_check(struct btrfs_root *root, |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4966 | struct btrfs_block_rsv *block_rsv, int min_factor) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4967 | { |
| 4968 | u64 num_bytes = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4969 | int ret = -ENOSPC; |
| 4970 | |
| 4971 | if (!block_rsv) |
| 4972 | return 0; |
| 4973 | |
| 4974 | spin_lock(&block_rsv->lock); |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4975 | num_bytes = div_factor(block_rsv->size, min_factor); |
| 4976 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4977 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4978 | spin_unlock(&block_rsv->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4979 | |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4980 | return ret; |
| 4981 | } |
| 4982 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4983 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
| 4984 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, |
| 4985 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4986 | { |
| 4987 | u64 num_bytes = 0; |
| 4988 | int ret = -ENOSPC; |
| 4989 | |
| 4990 | if (!block_rsv) |
| 4991 | return 0; |
| 4992 | |
| 4993 | spin_lock(&block_rsv->lock); |
| 4994 | num_bytes = min_reserved; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4995 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4996 | ret = 0; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4997 | else |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4998 | num_bytes -= block_rsv->reserved; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4999 | spin_unlock(&block_rsv->lock); |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 5000 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5001 | if (!ret) |
| 5002 | return 0; |
| 5003 | |
Miao Xie | aa38a71 | 2011-11-18 17:43:00 +0800 | [diff] [blame] | 5004 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 5005 | if (!ret) { |
| 5006 | block_rsv_add_bytes(block_rsv, num_bytes, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5007 | return 0; |
| 5008 | } |
| 5009 | |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 5010 | return ret; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5011 | } |
| 5012 | |
| 5013 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, |
| 5014 | struct btrfs_block_rsv *dst_rsv, |
| 5015 | u64 num_bytes) |
| 5016 | { |
| 5017 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 5018 | } |
| 5019 | |
| 5020 | void btrfs_block_rsv_release(struct btrfs_root *root, |
| 5021 | struct btrfs_block_rsv *block_rsv, |
| 5022 | u64 num_bytes) |
| 5023 | { |
| 5024 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Liu Bo | 1750458 | 2013-12-29 21:44:50 +0800 | [diff] [blame] | 5025 | if (global_rsv == block_rsv || |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5026 | block_rsv->space_info != global_rsv->space_info) |
| 5027 | global_rsv = NULL; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5028 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
| 5029 | num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5030 | } |
| 5031 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5032 | /* |
| 5033 | * helper to calculate size of global block reservation. |
| 5034 | * the desired value is sum of space used by extent tree, |
| 5035 | * checksum tree and root tree |
| 5036 | */ |
| 5037 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
| 5038 | { |
| 5039 | struct btrfs_space_info *sinfo; |
| 5040 | u64 num_bytes; |
| 5041 | u64 meta_used; |
| 5042 | u64 data_used; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5043 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5044 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5045 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
| 5046 | spin_lock(&sinfo->lock); |
| 5047 | data_used = sinfo->bytes_used; |
| 5048 | spin_unlock(&sinfo->lock); |
| 5049 | |
| 5050 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
| 5051 | spin_lock(&sinfo->lock); |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 5052 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
| 5053 | data_used = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5054 | meta_used = sinfo->bytes_used; |
| 5055 | spin_unlock(&sinfo->lock); |
| 5056 | |
| 5057 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
| 5058 | csum_size * 2; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 5059 | num_bytes += div_u64(data_used + meta_used, 50); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5060 | |
| 5061 | if (num_bytes * 3 > meta_used) |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 5062 | num_bytes = div_u64(meta_used, 3); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5063 | |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 5064 | return ALIGN(num_bytes, fs_info->extent_root->nodesize << 10); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5065 | } |
| 5066 | |
| 5067 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 5068 | { |
| 5069 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| 5070 | struct btrfs_space_info *sinfo = block_rsv->space_info; |
| 5071 | u64 num_bytes; |
| 5072 | |
| 5073 | num_bytes = calc_global_metadata_size(fs_info); |
| 5074 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5075 | spin_lock(&sinfo->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 5076 | spin_lock(&block_rsv->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5077 | |
Josef Bacik | fdf30d1 | 2013-03-26 15:31:45 -0400 | [diff] [blame] | 5078 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5079 | |
| 5080 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 5081 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
| 5082 | sinfo->bytes_may_use; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5083 | |
| 5084 | if (sinfo->total_bytes > num_bytes) { |
| 5085 | num_bytes = sinfo->total_bytes - num_bytes; |
| 5086 | block_rsv->reserved += num_bytes; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5087 | sinfo->bytes_may_use += num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5088 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5089 | sinfo->flags, num_bytes, 1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5090 | } |
| 5091 | |
| 5092 | if (block_rsv->reserved >= block_rsv->size) { |
| 5093 | num_bytes = block_rsv->reserved - block_rsv->size; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5094 | sinfo->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5095 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5096 | sinfo->flags, num_bytes, 0); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5097 | block_rsv->reserved = block_rsv->size; |
| 5098 | block_rsv->full = 1; |
| 5099 | } |
David Sterba | 182608c | 2011-05-05 13:13:16 +0200 | [diff] [blame] | 5100 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5101 | spin_unlock(&block_rsv->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 5102 | spin_unlock(&sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5103 | } |
| 5104 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5105 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 5106 | { |
| 5107 | struct btrfs_space_info *space_info; |
| 5108 | |
| 5109 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 5110 | fs_info->chunk_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5111 | |
| 5112 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5113 | fs_info->global_block_rsv.space_info = space_info; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5114 | fs_info->delalloc_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5115 | fs_info->trans_block_rsv.space_info = space_info; |
| 5116 | fs_info->empty_block_rsv.space_info = space_info; |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 5117 | fs_info->delayed_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5118 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5119 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
| 5120 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; |
| 5121 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; |
| 5122 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; |
Stefan Behrens | 3a6cad9 | 2013-05-16 14:48:19 +0000 | [diff] [blame] | 5123 | if (fs_info->quota_root) |
| 5124 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5125 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5126 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5127 | update_global_block_rsv(fs_info); |
| 5128 | } |
| 5129 | |
| 5130 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 5131 | { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5132 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
| 5133 | (u64)-1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5134 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
| 5135 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); |
| 5136 | WARN_ON(fs_info->trans_block_rsv.size > 0); |
| 5137 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); |
| 5138 | WARN_ON(fs_info->chunk_block_rsv.size > 0); |
| 5139 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 5140 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
| 5141 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 5142 | } |
| 5143 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5144 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
| 5145 | struct btrfs_root *root) |
| 5146 | { |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 5147 | if (!trans->block_rsv) |
| 5148 | return; |
| 5149 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5150 | if (!trans->bytes_reserved) |
| 5151 | return; |
| 5152 | |
Chris Mason | e77266e | 2012-02-24 10:39:05 -0500 | [diff] [blame] | 5153 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5154 | trans->transid, trans->bytes_reserved, 0); |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 5155 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5156 | trans->bytes_reserved = 0; |
| 5157 | } |
| 5158 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5159 | /* Can only return 0 or -ENOSPC */ |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5160 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
| 5161 | struct inode *inode) |
| 5162 | { |
| 5163 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5164 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); |
| 5165 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; |
| 5166 | |
| 5167 | /* |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 5168 | * We need to hold space in order to delete our orphan item once we've |
| 5169 | * added it, so this takes the reservation so we can release it later |
| 5170 | * when we are truly done with the orphan item. |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5171 | */ |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5172 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5173 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 5174 | btrfs_ino(inode), num_bytes, 1); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5175 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 5176 | } |
| 5177 | |
| 5178 | void btrfs_orphan_release_metadata(struct inode *inode) |
| 5179 | { |
| 5180 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5181 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5182 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 5183 | btrfs_ino(inode), num_bytes, 0); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5184 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
| 5185 | } |
| 5186 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5187 | /* |
| 5188 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation |
| 5189 | * root: the root of the parent directory |
| 5190 | * rsv: block reservation |
| 5191 | * items: the number of items that we need do reservation |
| 5192 | * qgroup_reserved: used to return the reserved size in qgroup |
| 5193 | * |
| 5194 | * This function is used to reserve the space for snapshot/subvolume |
| 5195 | * creation and deletion. Those operations are different with the |
| 5196 | * common file/directory operations, they change two fs/file trees |
| 5197 | * and root tree, the number of items that the qgroup reserves is |
| 5198 | * different with the free space reservation. So we can not use |
| 5199 | * the space reseravtion mechanism in start_transaction(). |
| 5200 | */ |
| 5201 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, |
| 5202 | struct btrfs_block_rsv *rsv, |
| 5203 | int items, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 5204 | u64 *qgroup_reserved, |
| 5205 | bool use_global_rsv) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5206 | { |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5207 | u64 num_bytes; |
| 5208 | int ret; |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 5209 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5210 | |
| 5211 | if (root->fs_info->quota_enabled) { |
| 5212 | /* One for parent inode, two for dir entries */ |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 5213 | num_bytes = 3 * root->nodesize; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5214 | ret = btrfs_qgroup_reserve(root, num_bytes); |
| 5215 | if (ret) |
| 5216 | return ret; |
| 5217 | } else { |
| 5218 | num_bytes = 0; |
| 5219 | } |
| 5220 | |
| 5221 | *qgroup_reserved = num_bytes; |
| 5222 | |
| 5223 | num_bytes = btrfs_calc_trans_metadata_size(root, items); |
| 5224 | rsv->space_info = __find_space_info(root->fs_info, |
| 5225 | BTRFS_BLOCK_GROUP_METADATA); |
| 5226 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, |
| 5227 | BTRFS_RESERVE_FLUSH_ALL); |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 5228 | |
| 5229 | if (ret == -ENOSPC && use_global_rsv) |
| 5230 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); |
| 5231 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5232 | if (ret) { |
| 5233 | if (*qgroup_reserved) |
| 5234 | btrfs_qgroup_free(root, *qgroup_reserved); |
| 5235 | } |
| 5236 | |
| 5237 | return ret; |
| 5238 | } |
| 5239 | |
| 5240 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, |
| 5241 | struct btrfs_block_rsv *rsv, |
| 5242 | u64 qgroup_reserved) |
| 5243 | { |
| 5244 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5245 | } |
| 5246 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5247 | /** |
| 5248 | * drop_outstanding_extent - drop an outstanding extent |
| 5249 | * @inode: the inode we're dropping the extent for |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5250 | * @num_bytes: the number of bytes we're relaseing. |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5251 | * |
| 5252 | * This is called when we are freeing up an outstanding extent, either called |
| 5253 | * after an error or after an extent is written. This will return the number of |
| 5254 | * reserved extents that need to be freed. This must be called with |
| 5255 | * BTRFS_I(inode)->lock held. |
| 5256 | */ |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5257 | static unsigned drop_outstanding_extent(struct inode *inode, u64 num_bytes) |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5258 | { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5259 | unsigned drop_inode_space = 0; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5260 | unsigned dropped_extents = 0; |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5261 | unsigned num_extents = 0; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5262 | |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5263 | num_extents = (unsigned)div64_u64(num_bytes + |
| 5264 | BTRFS_MAX_EXTENT_SIZE - 1, |
| 5265 | BTRFS_MAX_EXTENT_SIZE); |
| 5266 | ASSERT(num_extents); |
| 5267 | ASSERT(BTRFS_I(inode)->outstanding_extents >= num_extents); |
| 5268 | BTRFS_I(inode)->outstanding_extents -= num_extents; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5269 | |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5270 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5271 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5272 | &BTRFS_I(inode)->runtime_flags)) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5273 | drop_inode_space = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5274 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5275 | /* |
| 5276 | * If we have more or the same amount of outsanding extents than we have |
| 5277 | * reserved then we need to leave the reserved extents count alone. |
| 5278 | */ |
| 5279 | if (BTRFS_I(inode)->outstanding_extents >= |
| 5280 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5281 | return drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5282 | |
| 5283 | dropped_extents = BTRFS_I(inode)->reserved_extents - |
| 5284 | BTRFS_I(inode)->outstanding_extents; |
| 5285 | BTRFS_I(inode)->reserved_extents -= dropped_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5286 | return dropped_extents + drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5287 | } |
| 5288 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5289 | /** |
| 5290 | * calc_csum_metadata_size - return the amount of metada space that must be |
| 5291 | * reserved/free'd for the given bytes. |
| 5292 | * @inode: the inode we're manipulating |
| 5293 | * @num_bytes: the number of bytes in question |
| 5294 | * @reserve: 1 if we are reserving space, 0 if we are freeing space |
| 5295 | * |
| 5296 | * This adjusts the number of csum_bytes in the inode and then returns the |
| 5297 | * correct amount of metadata that must either be reserved or freed. We |
| 5298 | * calculate how many checksums we can fit into one leaf and then divide the |
| 5299 | * number of bytes that will need to be checksumed by this value to figure out |
| 5300 | * how many checksums will be required. If we are adding bytes then the number |
| 5301 | * may go up and we will return the number of additional bytes that must be |
| 5302 | * reserved. If it is going down we will return the number of bytes that must |
| 5303 | * be freed. |
| 5304 | * |
| 5305 | * This must be called with BTRFS_I(inode)->lock held. |
| 5306 | */ |
| 5307 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, |
| 5308 | int reserve) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5309 | { |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5310 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 5311 | u64 old_csums, num_csums; |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5312 | |
| 5313 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && |
| 5314 | BTRFS_I(inode)->csum_bytes == 0) |
| 5315 | return 0; |
| 5316 | |
Chris Mason | 28f75a0 | 2015-02-04 06:59:29 -0800 | [diff] [blame] | 5317 | old_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5318 | if (reserve) |
| 5319 | BTRFS_I(inode)->csum_bytes += num_bytes; |
| 5320 | else |
| 5321 | BTRFS_I(inode)->csum_bytes -= num_bytes; |
Chris Mason | 28f75a0 | 2015-02-04 06:59:29 -0800 | [diff] [blame] | 5322 | num_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5323 | |
| 5324 | /* No change, no need to reserve more */ |
| 5325 | if (old_csums == num_csums) |
| 5326 | return 0; |
| 5327 | |
| 5328 | if (reserve) |
| 5329 | return btrfs_calc_trans_metadata_size(root, |
| 5330 | num_csums - old_csums); |
| 5331 | |
| 5332 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5333 | } |
| 5334 | |
| 5335 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
| 5336 | { |
| 5337 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5338 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5339 | u64 to_reserve = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5340 | u64 csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5341 | unsigned nr_extents = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5342 | int extra_reserve = 0; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5343 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
Jan Schmidt | eb6b88d | 2013-01-27 23:26:00 -0700 | [diff] [blame] | 5344 | int ret = 0; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5345 | bool delalloc_lock = true; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5346 | u64 to_free = 0; |
| 5347 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5348 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5349 | /* If we are a free space inode we need to not flush since we will be in |
| 5350 | * the middle of a transaction commit. We also don't need the delalloc |
| 5351 | * mutex since we won't race with anybody. We need this mostly to make |
| 5352 | * lockdep shut its filthy mouth. |
| 5353 | */ |
| 5354 | if (btrfs_is_free_space_inode(inode)) { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5355 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5356 | delalloc_lock = false; |
| 5357 | } |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 5358 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5359 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
| 5360 | btrfs_transaction_in_commit(root->fs_info)) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5361 | schedule_timeout(1); |
| 5362 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5363 | if (delalloc_lock) |
| 5364 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); |
| 5365 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5366 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 5367 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5368 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | 6a41dd0 | 2015-03-13 15:12:23 -0400 | [diff] [blame] | 5369 | nr_extents = (unsigned)div64_u64(num_bytes + |
| 5370 | BTRFS_MAX_EXTENT_SIZE - 1, |
| 5371 | BTRFS_MAX_EXTENT_SIZE); |
| 5372 | BTRFS_I(inode)->outstanding_extents += nr_extents; |
| 5373 | nr_extents = 0; |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 5374 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5375 | if (BTRFS_I(inode)->outstanding_extents > |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5376 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5377 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
| 5378 | BTRFS_I(inode)->reserved_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5379 | |
| 5380 | /* |
| 5381 | * Add an item to reserve for updating the inode when we complete the |
| 5382 | * delalloc io. |
| 5383 | */ |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5384 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5385 | &BTRFS_I(inode)->runtime_flags)) { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5386 | nr_extents++; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5387 | extra_reserve = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5388 | } |
| 5389 | |
| 5390 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5391 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5392 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5393 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 5394 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5395 | if (root->fs_info->quota_enabled) { |
Dongsheng Yang | 237c0e9 | 2014-12-29 06:23:05 -0500 | [diff] [blame] | 5396 | ret = btrfs_qgroup_reserve(root, nr_extents * root->nodesize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5397 | if (ret) |
| 5398 | goto out_fail; |
Wang Shilong | a9870c0 | 2013-03-01 11:33:01 +0000 | [diff] [blame] | 5399 | } |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5400 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5401 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
| 5402 | if (unlikely(ret)) { |
| 5403 | if (root->fs_info->quota_enabled) |
Dongsheng Yang | 237c0e9 | 2014-12-29 06:23:05 -0500 | [diff] [blame] | 5404 | btrfs_qgroup_free(root, nr_extents * root->nodesize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5405 | goto out_fail; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5406 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5407 | |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5408 | spin_lock(&BTRFS_I(inode)->lock); |
| 5409 | if (extra_reserve) { |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5410 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5411 | &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5412 | nr_extents--; |
| 5413 | } |
| 5414 | BTRFS_I(inode)->reserved_extents += nr_extents; |
| 5415 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5416 | |
| 5417 | if (delalloc_lock) |
| 5418 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5419 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5420 | if (to_reserve) |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 5421 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5422 | btrfs_ino(inode), to_reserve, 1); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5423 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
| 5424 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5425 | return 0; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5426 | |
| 5427 | out_fail: |
| 5428 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5429 | dropped = drop_outstanding_extent(inode, num_bytes); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5430 | /* |
| 5431 | * If the inodes csum_bytes is the same as the original |
| 5432 | * csum_bytes then we know we haven't raced with any free()ers |
| 5433 | * so we can just reduce our inodes csum bytes and carry on. |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5434 | */ |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5435 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5436 | calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5437 | } else { |
| 5438 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; |
| 5439 | u64 bytes; |
| 5440 | |
| 5441 | /* |
| 5442 | * This is tricky, but first we need to figure out how much we |
| 5443 | * free'd from any free-ers that occured during this |
| 5444 | * reservation, so we reset ->csum_bytes to the csum_bytes |
| 5445 | * before we dropped our lock, and then call the free for the |
| 5446 | * number of bytes that were freed while we were trying our |
| 5447 | * reservation. |
| 5448 | */ |
| 5449 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; |
| 5450 | BTRFS_I(inode)->csum_bytes = csum_bytes; |
| 5451 | to_free = calc_csum_metadata_size(inode, bytes, 0); |
| 5452 | |
| 5453 | |
| 5454 | /* |
| 5455 | * Now we need to see how much we would have freed had we not |
| 5456 | * been making this reservation and our ->csum_bytes were not |
| 5457 | * artificially inflated. |
| 5458 | */ |
| 5459 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; |
| 5460 | bytes = csum_bytes - orig_csum_bytes; |
| 5461 | bytes = calc_csum_metadata_size(inode, bytes, 0); |
| 5462 | |
| 5463 | /* |
| 5464 | * Now reset ->csum_bytes to what it should be. If bytes is |
| 5465 | * more than to_free then we would have free'd more space had we |
| 5466 | * not had an artificially high ->csum_bytes, so we need to free |
| 5467 | * the remainder. If bytes is the same or less then we don't |
| 5468 | * need to do anything, the other free-ers did the correct |
| 5469 | * thing. |
| 5470 | */ |
| 5471 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; |
| 5472 | if (bytes > to_free) |
| 5473 | to_free = bytes - to_free; |
| 5474 | else |
| 5475 | to_free = 0; |
| 5476 | } |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5477 | spin_unlock(&BTRFS_I(inode)->lock); |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 5478 | if (dropped) |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5479 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
| 5480 | |
| 5481 | if (to_free) { |
| 5482 | btrfs_block_rsv_release(root, block_rsv, to_free); |
| 5483 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5484 | btrfs_ino(inode), to_free, 0); |
| 5485 | } |
| 5486 | if (delalloc_lock) |
| 5487 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
| 5488 | return ret; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5489 | } |
| 5490 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5491 | /** |
| 5492 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode |
| 5493 | * @inode: the inode to release the reservation for |
| 5494 | * @num_bytes: the number of bytes we're releasing |
| 5495 | * |
| 5496 | * This will release the metadata reservation for an inode. This can be called |
| 5497 | * once we complete IO for a given set of bytes to release their metadata |
| 5498 | * reservations. |
| 5499 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5500 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
| 5501 | { |
| 5502 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5503 | u64 to_free = 0; |
| 5504 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5505 | |
| 5506 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5507 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | dcab6a3 | 2015-02-11 15:08:59 -0500 | [diff] [blame] | 5508 | dropped = drop_outstanding_extent(inode, num_bytes); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5509 | |
Miao Xie | 0934856 | 2013-02-07 10:12:07 +0000 | [diff] [blame] | 5510 | if (num_bytes) |
| 5511 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5512 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5513 | if (dropped > 0) |
| 5514 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5515 | |
Josef Bacik | 6a3891c | 2015-03-16 17:38:52 -0400 | [diff] [blame] | 5516 | if (btrfs_test_is_dummy_root(root)) |
| 5517 | return; |
| 5518 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5519 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5520 | btrfs_ino(inode), to_free, 0); |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5521 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5522 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
| 5523 | to_free); |
| 5524 | } |
| 5525 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5526 | /** |
| 5527 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc |
| 5528 | * @inode: inode we're writing to |
| 5529 | * @num_bytes: the number of bytes we want to allocate |
| 5530 | * |
| 5531 | * This will do the following things |
| 5532 | * |
| 5533 | * o reserve space in the data space info for num_bytes |
| 5534 | * o reserve space in the metadata space info based on number of outstanding |
| 5535 | * extents and how much csums will be needed |
| 5536 | * o add to the inodes ->delalloc_bytes |
| 5537 | * o add it to the fs_info's delalloc inodes list. |
| 5538 | * |
| 5539 | * This will return 0 for success and -ENOSPC if there is no space left. |
| 5540 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5541 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
| 5542 | { |
| 5543 | int ret; |
| 5544 | |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 5545 | ret = btrfs_check_data_free_space(inode, num_bytes, num_bytes); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5546 | if (ret) |
| 5547 | return ret; |
| 5548 | |
| 5549 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); |
| 5550 | if (ret) { |
| 5551 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5552 | return ret; |
| 5553 | } |
| 5554 | |
| 5555 | return 0; |
| 5556 | } |
| 5557 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5558 | /** |
| 5559 | * btrfs_delalloc_release_space - release data and metadata space for delalloc |
| 5560 | * @inode: inode we're releasing space for |
| 5561 | * @num_bytes: the number of bytes we want to free up |
| 5562 | * |
| 5563 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is |
| 5564 | * called in the case that we don't need the metadata AND data reservations |
| 5565 | * anymore. So if there is an error or we insert an inline extent. |
| 5566 | * |
| 5567 | * This function will release the metadata space that was not used and will |
| 5568 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes |
| 5569 | * list if there are no delalloc bytes left. |
| 5570 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5571 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
| 5572 | { |
| 5573 | btrfs_delalloc_release_metadata(inode, num_bytes); |
| 5574 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5575 | } |
| 5576 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 5577 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 5578 | struct btrfs_root *root, u64 bytenr, |
| 5579 | u64 num_bytes, int alloc) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5580 | { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5581 | struct btrfs_block_group_cache *cache = NULL; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5582 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5583 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5584 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5585 | u64 byte_in_group; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5586 | int factor; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 5587 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5588 | /* block accounting for super block */ |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5589 | spin_lock(&info->delalloc_root_lock); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5590 | old_val = btrfs_super_bytes_used(info->super_copy); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5591 | if (alloc) |
| 5592 | old_val += num_bytes; |
| 5593 | else |
| 5594 | old_val -= num_bytes; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5595 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5596 | spin_unlock(&info->delalloc_root_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5597 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5598 | while (total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5599 | cache = btrfs_lookup_block_group(info, bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5600 | if (!cache) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5601 | return -ENOENT; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5602 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 5603 | BTRFS_BLOCK_GROUP_RAID1 | |
| 5604 | BTRFS_BLOCK_GROUP_RAID10)) |
| 5605 | factor = 2; |
| 5606 | else |
| 5607 | factor = 1; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 5608 | /* |
| 5609 | * If this block group has free space cache written out, we |
| 5610 | * need to make sure to load it if we are removing space. This |
| 5611 | * is because we need the unpinning stage to actually add the |
| 5612 | * space back to the block group, otherwise we will leak space. |
| 5613 | */ |
| 5614 | if (!alloc && cache->cached == BTRFS_CACHE_NO) |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5615 | cache_block_group(cache, 1); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5616 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5617 | byte_in_group = bytenr - cache->key.objectid; |
| 5618 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5619 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5620 | spin_lock(&cache->space_info->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5621 | spin_lock(&cache->lock); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5622 | |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 5623 | if (btrfs_test_opt(root, SPACE_CACHE) && |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5624 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
| 5625 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
| 5626 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5627 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5628 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5629 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5630 | old_val += num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5631 | btrfs_set_block_group_used(&cache->item, old_val); |
| 5632 | cache->reserved -= num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5633 | cache->space_info->bytes_reserved -= num_bytes; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5634 | cache->space_info->bytes_used += num_bytes; |
| 5635 | cache->space_info->disk_used += num_bytes * factor; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5636 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5637 | spin_unlock(&cache->space_info->lock); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5638 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5639 | old_val -= num_bytes; |
Filipe Manana | ae0ab00 | 2014-11-26 15:28:52 +0000 | [diff] [blame] | 5640 | btrfs_set_block_group_used(&cache->item, old_val); |
| 5641 | cache->pinned += num_bytes; |
| 5642 | cache->space_info->bytes_pinned += num_bytes; |
| 5643 | cache->space_info->bytes_used -= num_bytes; |
| 5644 | cache->space_info->disk_used -= num_bytes * factor; |
| 5645 | spin_unlock(&cache->lock); |
| 5646 | spin_unlock(&cache->space_info->lock); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 5647 | |
Filipe Manana | ae0ab00 | 2014-11-26 15:28:52 +0000 | [diff] [blame] | 5648 | set_extent_dirty(info->pinned_extents, |
| 5649 | bytenr, bytenr + num_bytes - 1, |
| 5650 | GFP_NOFS | __GFP_NOFAIL); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 5651 | /* |
| 5652 | * No longer have used bytes in this block group, queue |
| 5653 | * it for deletion. |
| 5654 | */ |
| 5655 | if (old_val == 0) { |
| 5656 | spin_lock(&info->unused_bgs_lock); |
| 5657 | if (list_empty(&cache->bg_list)) { |
| 5658 | btrfs_get_block_group(cache); |
| 5659 | list_add_tail(&cache->bg_list, |
| 5660 | &info->unused_bgs); |
| 5661 | } |
| 5662 | spin_unlock(&info->unused_bgs_lock); |
| 5663 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5664 | } |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 5665 | |
| 5666 | spin_lock(&trans->transaction->dirty_bgs_lock); |
| 5667 | if (list_empty(&cache->dirty_list)) { |
| 5668 | list_add_tail(&cache->dirty_list, |
| 5669 | &trans->transaction->dirty_bgs); |
| 5670 | trans->transaction->num_dirty_bgs++; |
| 5671 | btrfs_get_block_group(cache); |
| 5672 | } |
| 5673 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
| 5674 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5675 | btrfs_put_block_group(cache); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5676 | total -= num_bytes; |
| 5677 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5678 | } |
| 5679 | return 0; |
| 5680 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5681 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5682 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 5683 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5684 | struct btrfs_block_group_cache *cache; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5685 | u64 bytenr; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5686 | |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 5687 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 5688 | bytenr = root->fs_info->first_logical_byte; |
| 5689 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 5690 | |
| 5691 | if (bytenr < (u64)-1) |
| 5692 | return bytenr; |
| 5693 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5694 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
| 5695 | if (!cache) |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5696 | return 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5697 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5698 | bytenr = cache->key.objectid; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5699 | btrfs_put_block_group(cache); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5700 | |
| 5701 | return bytenr; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5702 | } |
| 5703 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5704 | static int pin_down_extent(struct btrfs_root *root, |
| 5705 | struct btrfs_block_group_cache *cache, |
| 5706 | u64 bytenr, u64 num_bytes, int reserved) |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5707 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5708 | spin_lock(&cache->space_info->lock); |
| 5709 | spin_lock(&cache->lock); |
| 5710 | cache->pinned += num_bytes; |
| 5711 | cache->space_info->bytes_pinned += num_bytes; |
| 5712 | if (reserved) { |
| 5713 | cache->reserved -= num_bytes; |
| 5714 | cache->space_info->bytes_reserved -= num_bytes; |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5715 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5716 | spin_unlock(&cache->lock); |
| 5717 | spin_unlock(&cache->space_info->lock); |
| 5718 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5719 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
| 5720 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); |
Dongsheng Yang | e2d1f92 | 2015-02-06 10:26:52 -0500 | [diff] [blame] | 5721 | if (reserved) |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 5722 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5723 | return 0; |
| 5724 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5725 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5726 | /* |
| 5727 | * this function must be called within transaction |
| 5728 | */ |
| 5729 | int btrfs_pin_extent(struct btrfs_root *root, |
| 5730 | u64 bytenr, u64 num_bytes, int reserved) |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5731 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5732 | struct btrfs_block_group_cache *cache; |
| 5733 | |
| 5734 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5735 | BUG_ON(!cache); /* Logic error */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5736 | |
| 5737 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); |
| 5738 | |
| 5739 | btrfs_put_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5740 | return 0; |
| 5741 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5742 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5743 | /* |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5744 | * this function must be called within transaction |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5745 | */ |
Liu Bo | dcfac41 | 2012-12-27 09:01:20 +0000 | [diff] [blame] | 5746 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5747 | u64 bytenr, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5748 | { |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5749 | struct btrfs_block_group_cache *cache; |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5750 | int ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5751 | |
| 5752 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5753 | if (!cache) |
| 5754 | return -EINVAL; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5755 | |
| 5756 | /* |
| 5757 | * pull in the free space cache (if any) so that our pin |
| 5758 | * removes the free space from the cache. We have load_only set |
| 5759 | * to one because the slow code to read in the free extents does check |
| 5760 | * the pinned extents. |
| 5761 | */ |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5762 | cache_block_group(cache, 1); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5763 | |
| 5764 | pin_down_extent(root, cache, bytenr, num_bytes, 0); |
| 5765 | |
| 5766 | /* remove us from the free space cache (if we're there at all) */ |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5767 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5768 | btrfs_put_block_group(cache); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5769 | return ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5770 | } |
| 5771 | |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 5772 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
| 5773 | { |
| 5774 | int ret; |
| 5775 | struct btrfs_block_group_cache *block_group; |
| 5776 | struct btrfs_caching_control *caching_ctl; |
| 5777 | |
| 5778 | block_group = btrfs_lookup_block_group(root->fs_info, start); |
| 5779 | if (!block_group) |
| 5780 | return -EINVAL; |
| 5781 | |
| 5782 | cache_block_group(block_group, 0); |
| 5783 | caching_ctl = get_caching_control(block_group); |
| 5784 | |
| 5785 | if (!caching_ctl) { |
| 5786 | /* Logic error */ |
| 5787 | BUG_ON(!block_group_cache_done(block_group)); |
| 5788 | ret = btrfs_remove_free_space(block_group, start, num_bytes); |
| 5789 | } else { |
| 5790 | mutex_lock(&caching_ctl->mutex); |
| 5791 | |
| 5792 | if (start >= caching_ctl->progress) { |
| 5793 | ret = add_excluded_extent(root, start, num_bytes); |
| 5794 | } else if (start + num_bytes <= caching_ctl->progress) { |
| 5795 | ret = btrfs_remove_free_space(block_group, |
| 5796 | start, num_bytes); |
| 5797 | } else { |
| 5798 | num_bytes = caching_ctl->progress - start; |
| 5799 | ret = btrfs_remove_free_space(block_group, |
| 5800 | start, num_bytes); |
| 5801 | if (ret) |
| 5802 | goto out_lock; |
| 5803 | |
| 5804 | num_bytes = (start + num_bytes) - |
| 5805 | caching_ctl->progress; |
| 5806 | start = caching_ctl->progress; |
| 5807 | ret = add_excluded_extent(root, start, num_bytes); |
| 5808 | } |
| 5809 | out_lock: |
| 5810 | mutex_unlock(&caching_ctl->mutex); |
| 5811 | put_caching_control(caching_ctl); |
| 5812 | } |
| 5813 | btrfs_put_block_group(block_group); |
| 5814 | return ret; |
| 5815 | } |
| 5816 | |
| 5817 | int btrfs_exclude_logged_extents(struct btrfs_root *log, |
| 5818 | struct extent_buffer *eb) |
| 5819 | { |
| 5820 | struct btrfs_file_extent_item *item; |
| 5821 | struct btrfs_key key; |
| 5822 | int found_type; |
| 5823 | int i; |
| 5824 | |
| 5825 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) |
| 5826 | return 0; |
| 5827 | |
| 5828 | for (i = 0; i < btrfs_header_nritems(eb); i++) { |
| 5829 | btrfs_item_key_to_cpu(eb, &key, i); |
| 5830 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 5831 | continue; |
| 5832 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); |
| 5833 | found_type = btrfs_file_extent_type(eb, item); |
| 5834 | if (found_type == BTRFS_FILE_EXTENT_INLINE) |
| 5835 | continue; |
| 5836 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) |
| 5837 | continue; |
| 5838 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); |
| 5839 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); |
| 5840 | __exclude_logged_extent(log, key.objectid, key.offset); |
| 5841 | } |
| 5842 | |
| 5843 | return 0; |
| 5844 | } |
| 5845 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5846 | /** |
| 5847 | * btrfs_update_reserved_bytes - update the block_group and space info counters |
| 5848 | * @cache: The cache we are manipulating |
| 5849 | * @num_bytes: The number of bytes in question |
| 5850 | * @reserve: One of the reservation enums |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5851 | * @delalloc: The blocks are allocated for the delalloc write |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5852 | * |
| 5853 | * This is called by the allocator when it reserves space, or by somebody who is |
| 5854 | * freeing space that was never actually used on disk. For example if you |
| 5855 | * reserve some space for a new leaf in transaction A and before transaction A |
| 5856 | * commits you free that leaf, you call this with reserve set to 0 in order to |
| 5857 | * clear the reservation. |
| 5858 | * |
| 5859 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper |
| 5860 | * ENOSPC accounting. For data we handle the reservation through clearing the |
| 5861 | * delalloc bits in the io_tree. We have to do this since we could end up |
| 5862 | * allocating less disk space for the amount of data we have reserved in the |
| 5863 | * case of compression. |
| 5864 | * |
| 5865 | * If this is a reservation and the block group has become read only we cannot |
| 5866 | * make the reservation and return -EAGAIN, otherwise this function always |
| 5867 | * succeeds. |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5868 | */ |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5869 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5870 | u64 num_bytes, int reserve, int delalloc) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5871 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5872 | struct btrfs_space_info *space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5873 | int ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5874 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5875 | spin_lock(&space_info->lock); |
| 5876 | spin_lock(&cache->lock); |
| 5877 | if (reserve != RESERVE_FREE) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5878 | if (cache->ro) { |
| 5879 | ret = -EAGAIN; |
| 5880 | } else { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5881 | cache->reserved += num_bytes; |
| 5882 | space_info->bytes_reserved += num_bytes; |
| 5883 | if (reserve == RESERVE_ALLOC) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5884 | trace_btrfs_space_reservation(cache->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5885 | "space_info", space_info->flags, |
| 5886 | num_bytes, 0); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5887 | space_info->bytes_may_use -= num_bytes; |
| 5888 | } |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5889 | |
| 5890 | if (delalloc) |
| 5891 | cache->delalloc_bytes += num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5892 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5893 | } else { |
| 5894 | if (cache->ro) |
| 5895 | space_info->bytes_readonly += num_bytes; |
| 5896 | cache->reserved -= num_bytes; |
| 5897 | space_info->bytes_reserved -= num_bytes; |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5898 | |
| 5899 | if (delalloc) |
| 5900 | cache->delalloc_bytes -= num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5901 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5902 | spin_unlock(&cache->lock); |
| 5903 | spin_unlock(&space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5904 | return ret; |
| 5905 | } |
| 5906 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 5907 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5908 | struct btrfs_root *root) |
| 5909 | { |
| 5910 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5911 | struct btrfs_caching_control *next; |
| 5912 | struct btrfs_caching_control *caching_ctl; |
| 5913 | struct btrfs_block_group_cache *cache; |
| 5914 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 5915 | down_write(&fs_info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5916 | |
| 5917 | list_for_each_entry_safe(caching_ctl, next, |
| 5918 | &fs_info->caching_block_groups, list) { |
| 5919 | cache = caching_ctl->block_group; |
| 5920 | if (block_group_cache_done(cache)) { |
| 5921 | cache->last_byte_to_unpin = (u64)-1; |
| 5922 | list_del_init(&caching_ctl->list); |
| 5923 | put_caching_control(caching_ctl); |
| 5924 | } else { |
| 5925 | cache->last_byte_to_unpin = caching_ctl->progress; |
| 5926 | } |
| 5927 | } |
| 5928 | |
| 5929 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 5930 | fs_info->pinned_extents = &fs_info->freed_extents[1]; |
| 5931 | else |
| 5932 | fs_info->pinned_extents = &fs_info->freed_extents[0]; |
| 5933 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 5934 | up_write(&fs_info->commit_root_sem); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5935 | |
| 5936 | update_global_block_rsv(fs_info); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5937 | } |
| 5938 | |
Filipe Manana | 678886b | 2014-12-07 21:31:47 +0000 | [diff] [blame] | 5939 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end, |
| 5940 | const bool return_free_space) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5941 | { |
| 5942 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5943 | struct btrfs_block_group_cache *cache = NULL; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5944 | struct btrfs_space_info *space_info; |
| 5945 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5946 | u64 len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5947 | bool readonly; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5948 | |
| 5949 | while (start <= end) { |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5950 | readonly = false; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5951 | if (!cache || |
| 5952 | start >= cache->key.objectid + cache->key.offset) { |
| 5953 | if (cache) |
| 5954 | btrfs_put_block_group(cache); |
| 5955 | cache = btrfs_lookup_block_group(fs_info, start); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5956 | BUG_ON(!cache); /* Logic error */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5957 | } |
| 5958 | |
| 5959 | len = cache->key.objectid + cache->key.offset - start; |
| 5960 | len = min(len, end + 1 - start); |
| 5961 | |
| 5962 | if (start < cache->last_byte_to_unpin) { |
| 5963 | len = min(len, cache->last_byte_to_unpin - start); |
Filipe Manana | 678886b | 2014-12-07 21:31:47 +0000 | [diff] [blame] | 5964 | if (return_free_space) |
| 5965 | btrfs_add_free_space(cache, start, len); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5966 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5967 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5968 | start += len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5969 | space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5970 | |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5971 | spin_lock(&space_info->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5972 | spin_lock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5973 | cache->pinned -= len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5974 | space_info->bytes_pinned -= len; |
Liu Bo | d288db5 | 2014-07-02 16:58:01 +0800 | [diff] [blame] | 5975 | percpu_counter_add(&space_info->total_bytes_pinned, -len); |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5976 | if (cache->ro) { |
| 5977 | space_info->bytes_readonly += len; |
| 5978 | readonly = true; |
| 5979 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5980 | spin_unlock(&cache->lock); |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5981 | if (!readonly && global_rsv->space_info == space_info) { |
| 5982 | spin_lock(&global_rsv->lock); |
| 5983 | if (!global_rsv->full) { |
| 5984 | len = min(len, global_rsv->size - |
| 5985 | global_rsv->reserved); |
| 5986 | global_rsv->reserved += len; |
| 5987 | space_info->bytes_may_use += len; |
| 5988 | if (global_rsv->reserved >= global_rsv->size) |
| 5989 | global_rsv->full = 1; |
| 5990 | } |
| 5991 | spin_unlock(&global_rsv->lock); |
| 5992 | } |
| 5993 | spin_unlock(&space_info->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5994 | } |
| 5995 | |
| 5996 | if (cache) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5997 | btrfs_put_block_group(cache); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 5998 | return 0; |
| 5999 | } |
| 6000 | |
| 6001 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6002 | struct btrfs_root *root) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6003 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6004 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 6005 | struct extent_io_tree *unpin; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 6006 | u64 start; |
| 6007 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6008 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6009 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6010 | if (trans->aborted) |
| 6011 | return 0; |
| 6012 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6013 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 6014 | unpin = &fs_info->freed_extents[1]; |
| 6015 | else |
| 6016 | unpin = &fs_info->freed_extents[0]; |
| 6017 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6018 | while (1) { |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 6019 | mutex_lock(&fs_info->unused_bg_unpin_mutex); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 6020 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 6021 | EXTENT_DIRTY, NULL); |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 6022 | if (ret) { |
| 6023 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6024 | break; |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 6025 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6026 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 6027 | if (btrfs_test_opt(root, DISCARD)) |
| 6028 | ret = btrfs_discard_extent(root, start, |
| 6029 | end + 1 - start, NULL); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6030 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 6031 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
Filipe Manana | 678886b | 2014-12-07 21:31:47 +0000 | [diff] [blame] | 6032 | unpin_extent_range(root, start, end, true); |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 6033 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6034 | cond_resched(); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6035 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6036 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 6037 | return 0; |
| 6038 | } |
| 6039 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6040 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
| 6041 | u64 owner, u64 root_objectid) |
| 6042 | { |
| 6043 | struct btrfs_space_info *space_info; |
| 6044 | u64 flags; |
| 6045 | |
| 6046 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 6047 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) |
| 6048 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 6049 | else |
| 6050 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 6051 | } else { |
| 6052 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 6053 | } |
| 6054 | |
| 6055 | space_info = __find_space_info(fs_info, flags); |
| 6056 | BUG_ON(!space_info); /* Logic bug */ |
| 6057 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); |
| 6058 | } |
| 6059 | |
| 6060 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6061 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 6062 | struct btrfs_root *root, |
| 6063 | u64 bytenr, u64 num_bytes, u64 parent, |
| 6064 | u64 root_objectid, u64 owner_objectid, |
| 6065 | u64 owner_offset, int refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6066 | struct btrfs_delayed_extent_op *extent_op, |
| 6067 | int no_quota) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6068 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 6069 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6070 | struct btrfs_path *path; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 6071 | struct btrfs_fs_info *info = root->fs_info; |
| 6072 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6073 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6074 | struct btrfs_extent_item *ei; |
| 6075 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6076 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6077 | int is_data; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6078 | int extent_slot = 0; |
| 6079 | int found_extent = 0; |
| 6080 | int num_to_del = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6081 | u32 item_size; |
| 6082 | u64 refs; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6083 | int last_ref = 0; |
| 6084 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_SUB_EXCL; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6085 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 6086 | SKINNY_METADATA); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 6087 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6088 | if (!info->quota_enabled || !is_fstree(root_objectid)) |
| 6089 | no_quota = 1; |
| 6090 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 6091 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 6092 | if (!path) |
| 6093 | return -ENOMEM; |
| 6094 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 6095 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6096 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6097 | |
| 6098 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; |
| 6099 | BUG_ON(!is_data && refs_to_drop != 1); |
| 6100 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6101 | if (is_data) |
| 6102 | skinny_metadata = 0; |
| 6103 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6104 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
| 6105 | bytenr, num_bytes, parent, |
| 6106 | root_objectid, owner_objectid, |
| 6107 | owner_offset); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 6108 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6109 | extent_slot = path->slots[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6110 | while (extent_slot >= 0) { |
| 6111 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6112 | extent_slot); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6113 | if (key.objectid != bytenr) |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6114 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6115 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
| 6116 | key.offset == num_bytes) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6117 | found_extent = 1; |
| 6118 | break; |
| 6119 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6120 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
| 6121 | key.offset == owner_objectid) { |
| 6122 | found_extent = 1; |
| 6123 | break; |
| 6124 | } |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6125 | if (path->slots[0] - extent_slot > 5) |
| 6126 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6127 | extent_slot--; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6128 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6129 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 6130 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); |
| 6131 | if (found_extent && item_size < sizeof(*ei)) |
| 6132 | found_extent = 0; |
| 6133 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 6134 | if (!found_extent) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6135 | BUG_ON(iref); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6136 | ret = remove_extent_backref(trans, extent_root, path, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6137 | NULL, refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6138 | is_data, &last_ref); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6139 | if (ret) { |
| 6140 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6141 | goto out; |
| 6142 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 6143 | btrfs_release_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6144 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6145 | |
| 6146 | key.objectid = bytenr; |
| 6147 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 6148 | key.offset = num_bytes; |
| 6149 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6150 | if (!is_data && skinny_metadata) { |
| 6151 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 6152 | key.offset = owner_objectid; |
| 6153 | } |
| 6154 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 6155 | ret = btrfs_search_slot(trans, extent_root, |
| 6156 | &key, path, -1, 1); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6157 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
| 6158 | /* |
| 6159 | * Couldn't find our skinny metadata item, |
| 6160 | * see if we have ye olde extent item. |
| 6161 | */ |
| 6162 | path->slots[0]--; |
| 6163 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 6164 | path->slots[0]); |
| 6165 | if (key.objectid == bytenr && |
| 6166 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 6167 | key.offset == num_bytes) |
| 6168 | ret = 0; |
| 6169 | } |
| 6170 | |
| 6171 | if (ret > 0 && skinny_metadata) { |
| 6172 | skinny_metadata = false; |
Filipe Manana | 9ce49a0 | 2014-04-24 15:15:28 +0100 | [diff] [blame] | 6173 | key.objectid = bytenr; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6174 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 6175 | key.offset = num_bytes; |
| 6176 | btrfs_release_path(path); |
| 6177 | ret = btrfs_search_slot(trans, extent_root, |
| 6178 | &key, path, -1, 1); |
| 6179 | } |
| 6180 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 6181 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6182 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6183 | ret, bytenr); |
Josef Bacik | b783e62 | 2011-07-13 15:03:50 +0000 | [diff] [blame] | 6184 | if (ret > 0) |
| 6185 | btrfs_print_leaf(extent_root, |
| 6186 | path->nodes[0]); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 6187 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6188 | if (ret < 0) { |
| 6189 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6190 | goto out; |
| 6191 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 6192 | extent_slot = path->slots[0]; |
| 6193 | } |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 6194 | } else if (WARN_ON(ret == -ENOENT)) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 6195 | btrfs_print_leaf(extent_root, path->nodes[0]); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6196 | btrfs_err(info, |
| 6197 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6198 | bytenr, parent, root_objectid, owner_objectid, |
| 6199 | owner_offset); |
Josef Bacik | c4a050b | 2014-03-14 16:36:53 -0400 | [diff] [blame] | 6200 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6201 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6202 | } else { |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6203 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6204 | goto out; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 6205 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6206 | |
| 6207 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6208 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 6209 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 6210 | if (item_size < sizeof(*ei)) { |
| 6211 | BUG_ON(found_extent || extent_slot != path->slots[0]); |
| 6212 | ret = convert_extent_item_v0(trans, extent_root, path, |
| 6213 | owner_objectid, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6214 | if (ret < 0) { |
| 6215 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6216 | goto out; |
| 6217 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6218 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 6219 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6220 | path->leave_spinning = 1; |
| 6221 | |
| 6222 | key.objectid = bytenr; |
| 6223 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 6224 | key.offset = num_bytes; |
| 6225 | |
| 6226 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 6227 | -1, 1); |
| 6228 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6229 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6230 | ret, bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6231 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 6232 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6233 | if (ret < 0) { |
| 6234 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6235 | goto out; |
| 6236 | } |
| 6237 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6238 | extent_slot = path->slots[0]; |
| 6239 | leaf = path->nodes[0]; |
| 6240 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 6241 | } |
| 6242 | #endif |
| 6243 | BUG_ON(item_size < sizeof(*ei)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6244 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 6245 | struct btrfs_extent_item); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6246 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
| 6247 | key.type == BTRFS_EXTENT_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6248 | struct btrfs_tree_block_info *bi; |
| 6249 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
| 6250 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 6251 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6252 | } |
| 6253 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6254 | refs = btrfs_extent_refs(leaf, ei); |
Josef Bacik | 32b0253 | 2013-04-24 16:38:50 -0400 | [diff] [blame] | 6255 | if (refs < refs_to_drop) { |
| 6256 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " |
David Sterba | 351fd35 | 2014-05-15 16:48:20 +0200 | [diff] [blame] | 6257 | "for bytenr %Lu", refs_to_drop, refs, bytenr); |
Josef Bacik | 32b0253 | 2013-04-24 16:38:50 -0400 | [diff] [blame] | 6258 | ret = -EINVAL; |
| 6259 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6260 | goto out; |
| 6261 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6262 | refs -= refs_to_drop; |
| 6263 | |
| 6264 | if (refs > 0) { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6265 | type = BTRFS_QGROUP_OPER_SUB_SHARED; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6266 | if (extent_op) |
| 6267 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 6268 | /* |
| 6269 | * In the case of inline back ref, reference count will |
| 6270 | * be updated by remove_extent_backref |
| 6271 | */ |
| 6272 | if (iref) { |
| 6273 | BUG_ON(!found_extent); |
| 6274 | } else { |
| 6275 | btrfs_set_extent_refs(leaf, ei, refs); |
| 6276 | btrfs_mark_buffer_dirty(leaf); |
| 6277 | } |
| 6278 | if (found_extent) { |
| 6279 | ret = remove_extent_backref(trans, extent_root, path, |
| 6280 | iref, refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6281 | is_data, &last_ref); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6282 | if (ret) { |
| 6283 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6284 | goto out; |
| 6285 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6286 | } |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6287 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
| 6288 | root_objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6289 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6290 | if (found_extent) { |
| 6291 | BUG_ON(is_data && refs_to_drop != |
| 6292 | extent_data_ref_count(root, path, iref)); |
| 6293 | if (iref) { |
| 6294 | BUG_ON(path->slots[0] != extent_slot); |
| 6295 | } else { |
| 6296 | BUG_ON(path->slots[0] != extent_slot + 1); |
| 6297 | path->slots[0] = extent_slot; |
| 6298 | num_to_del = 2; |
| 6299 | } |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 6300 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6301 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6302 | last_ref = 1; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6303 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 6304 | num_to_del); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6305 | if (ret) { |
| 6306 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6307 | goto out; |
| 6308 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 6309 | btrfs_release_path(path); |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 6310 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6311 | if (is_data) { |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 6312 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6313 | if (ret) { |
| 6314 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6315 | goto out; |
| 6316 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 6317 | } |
| 6318 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 6319 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6320 | if (ret) { |
| 6321 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6322 | goto out; |
| 6323 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6324 | } |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6325 | btrfs_release_path(path); |
| 6326 | |
| 6327 | /* Deal with the quota accounting */ |
| 6328 | if (!ret && last_ref && !no_quota) { |
| 6329 | int mod_seq = 0; |
| 6330 | |
| 6331 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID && |
| 6332 | type == BTRFS_QGROUP_OPER_SUB_SHARED) |
| 6333 | mod_seq = 1; |
| 6334 | |
| 6335 | ret = btrfs_qgroup_record_ref(trans, info, root_objectid, |
| 6336 | bytenr, num_bytes, type, |
| 6337 | mod_seq); |
| 6338 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6339 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 6340 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6341 | return ret; |
| 6342 | } |
| 6343 | |
| 6344 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6345 | * when we free an block, it is possible (and likely) that we free the last |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6346 | * delayed ref for that extent as well. This searches the delayed ref tree for |
| 6347 | * a given extent, and if there are no other delayed refs to be processed, it |
| 6348 | * removes it from the tree. |
| 6349 | */ |
| 6350 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, |
| 6351 | struct btrfs_root *root, u64 bytenr) |
| 6352 | { |
| 6353 | struct btrfs_delayed_ref_head *head; |
| 6354 | struct btrfs_delayed_ref_root *delayed_refs; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6355 | int ret = 0; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6356 | |
| 6357 | delayed_refs = &trans->transaction->delayed_refs; |
| 6358 | spin_lock(&delayed_refs->lock); |
| 6359 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 6360 | if (!head) |
Chris Mason | cf93da7 | 2014-01-29 07:02:40 -0800 | [diff] [blame] | 6361 | goto out_delayed_unlock; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6362 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6363 | spin_lock(&head->lock); |
| 6364 | if (rb_first(&head->ref_root)) |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6365 | goto out; |
| 6366 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6367 | if (head->extent_op) { |
| 6368 | if (!head->must_insert_reserved) |
| 6369 | goto out; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 6370 | btrfs_free_delayed_extent_op(head->extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6371 | head->extent_op = NULL; |
| 6372 | } |
| 6373 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6374 | /* |
| 6375 | * waiting for the lock here would deadlock. If someone else has it |
| 6376 | * locked they are already in the process of dropping it anyway |
| 6377 | */ |
| 6378 | if (!mutex_trylock(&head->mutex)) |
| 6379 | goto out; |
| 6380 | |
| 6381 | /* |
| 6382 | * at this point we have a head with no other entries. Go |
| 6383 | * ahead and process it. |
| 6384 | */ |
| 6385 | head->node.in_tree = 0; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 6386 | rb_erase(&head->href_node, &delayed_refs->href_root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6387 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6388 | atomic_dec(&delayed_refs->num_entries); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6389 | |
| 6390 | /* |
| 6391 | * we don't take a ref on the node because we're removing it from the |
| 6392 | * tree, so we just steal the ref the tree was holding. |
| 6393 | */ |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6394 | delayed_refs->num_heads--; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6395 | if (head->processing == 0) |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6396 | delayed_refs->num_heads_ready--; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6397 | head->processing = 0; |
| 6398 | spin_unlock(&head->lock); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6399 | spin_unlock(&delayed_refs->lock); |
| 6400 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6401 | BUG_ON(head->extent_op); |
| 6402 | if (head->must_insert_reserved) |
| 6403 | ret = 1; |
| 6404 | |
| 6405 | mutex_unlock(&head->mutex); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6406 | btrfs_put_delayed_ref(&head->node); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6407 | return ret; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6408 | out: |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6409 | spin_unlock(&head->lock); |
Chris Mason | cf93da7 | 2014-01-29 07:02:40 -0800 | [diff] [blame] | 6410 | |
| 6411 | out_delayed_unlock: |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6412 | spin_unlock(&delayed_refs->lock); |
| 6413 | return 0; |
| 6414 | } |
| 6415 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6416 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
| 6417 | struct btrfs_root *root, |
| 6418 | struct extent_buffer *buf, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6419 | u64 parent, int last_ref) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6420 | { |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6421 | int pin = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6422 | int ret; |
| 6423 | |
| 6424 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6425 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 6426 | buf->start, buf->len, |
| 6427 | parent, root->root_key.objectid, |
| 6428 | btrfs_header_level(buf), |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6429 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6430 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6431 | } |
| 6432 | |
| 6433 | if (!last_ref) |
| 6434 | return; |
| 6435 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6436 | if (btrfs_header_generation(buf) == trans->transid) { |
Filipe Manana | 6219872 | 2015-01-06 20:18:45 +0000 | [diff] [blame] | 6437 | struct btrfs_block_group_cache *cache; |
| 6438 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6439 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 6440 | ret = check_ref_cleanup(trans, root, buf->start); |
| 6441 | if (!ret) |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 6442 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6443 | } |
| 6444 | |
Filipe Manana | 6219872 | 2015-01-06 20:18:45 +0000 | [diff] [blame] | 6445 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
| 6446 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6447 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
| 6448 | pin_down_extent(root, cache, buf->start, buf->len, 1); |
Filipe Manana | 6219872 | 2015-01-06 20:18:45 +0000 | [diff] [blame] | 6449 | btrfs_put_block_group(cache); |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 6450 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6451 | } |
| 6452 | |
| 6453 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); |
| 6454 | |
| 6455 | btrfs_add_free_space(cache, buf->start, buf->len); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6456 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE, 0); |
Filipe Manana | 6219872 | 2015-01-06 20:18:45 +0000 | [diff] [blame] | 6457 | btrfs_put_block_group(cache); |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 6458 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6459 | pin = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6460 | } |
| 6461 | out: |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6462 | if (pin) |
| 6463 | add_pinned_bytes(root->fs_info, buf->len, |
| 6464 | btrfs_header_level(buf), |
| 6465 | root->root_key.objectid); |
| 6466 | |
Josef Bacik | a826d6d | 2011-03-16 13:42:43 -0400 | [diff] [blame] | 6467 | /* |
| 6468 | * Deleting the buffer, clear the corrupt flag since it doesn't matter |
| 6469 | * anymore. |
| 6470 | */ |
| 6471 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6472 | } |
| 6473 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6474 | /* Can return -ENOMEM */ |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6475 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 6476 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6477 | u64 owner, u64 offset, int no_quota) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6478 | { |
| 6479 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6480 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6481 | |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 6482 | if (btrfs_test_is_dummy_root(root)) |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 6483 | return 0; |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 6484 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6485 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
| 6486 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6487 | /* |
| 6488 | * tree log blocks never actually go into the extent allocation |
| 6489 | * tree, just update pinning info and exit early. |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6490 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6491 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 6492 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6493 | /* unlocks the pinned mutex */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6494 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6495 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6496 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6497 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 6498 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6499 | parent, root_objectid, (int)owner, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6500 | BTRFS_DROP_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6501 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6502 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 6503 | num_bytes, |
| 6504 | parent, root_objectid, owner, |
| 6505 | offset, BTRFS_DROP_DELAYED_REF, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6506 | NULL, no_quota); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6507 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6508 | return ret; |
| 6509 | } |
| 6510 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6511 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6512 | * when we wait for progress in the block group caching, its because |
| 6513 | * our allocation attempt failed at least once. So, we must sleep |
| 6514 | * and let some progress happen before we try again. |
| 6515 | * |
| 6516 | * This function will sleep at least once waiting for new free space to |
| 6517 | * show up, and then it will check the block group free space numbers |
| 6518 | * for our min num_bytes. Another option is to have it go ahead |
| 6519 | * and look in the rbtree for a free extent of a given size, but this |
| 6520 | * is a good start. |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6521 | * |
| 6522 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using |
| 6523 | * any of the information in this block group. |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6524 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6525 | static noinline void |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6526 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
| 6527 | u64 num_bytes) |
| 6528 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6529 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6530 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6531 | caching_ctl = get_caching_control(cache); |
| 6532 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6533 | return; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6534 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6535 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 6536 | (cache->free_space_ctl->free_space >= num_bytes)); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6537 | |
| 6538 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6539 | } |
| 6540 | |
| 6541 | static noinline int |
| 6542 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 6543 | { |
| 6544 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6545 | int ret = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6546 | |
| 6547 | caching_ctl = get_caching_control(cache); |
| 6548 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6549 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6550 | |
| 6551 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6552 | if (cache->cached == BTRFS_CACHE_ERROR) |
| 6553 | ret = -EIO; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6554 | put_caching_control(caching_ctl); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6555 | return ret; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6556 | } |
| 6557 | |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6558 | int __get_raid_index(u64 flags) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6559 | { |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6560 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6561 | return BTRFS_RAID_RAID10; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6562 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6563 | return BTRFS_RAID_RAID1; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6564 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6565 | return BTRFS_RAID_DUP; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6566 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6567 | return BTRFS_RAID_RAID0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6568 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6569 | return BTRFS_RAID_RAID5; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6570 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6571 | return BTRFS_RAID_RAID6; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6572 | |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6573 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6574 | } |
| 6575 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6576 | int get_block_group_index(struct btrfs_block_group_cache *cache) |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6577 | { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6578 | return __get_raid_index(cache->flags); |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6579 | } |
| 6580 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6581 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { |
| 6582 | [BTRFS_RAID_RAID10] = "raid10", |
| 6583 | [BTRFS_RAID_RAID1] = "raid1", |
| 6584 | [BTRFS_RAID_DUP] = "dup", |
| 6585 | [BTRFS_RAID_RAID0] = "raid0", |
| 6586 | [BTRFS_RAID_SINGLE] = "single", |
| 6587 | [BTRFS_RAID_RAID5] = "raid5", |
| 6588 | [BTRFS_RAID_RAID6] = "raid6", |
| 6589 | }; |
| 6590 | |
Jeff Mahoney | 1b8e5df | 2013-11-20 16:50:23 -0500 | [diff] [blame] | 6591 | static const char *get_raid_name(enum btrfs_raid_types type) |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6592 | { |
| 6593 | if (type >= BTRFS_NR_RAID_TYPES) |
| 6594 | return NULL; |
| 6595 | |
| 6596 | return btrfs_raid_type_names[type]; |
| 6597 | } |
| 6598 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6599 | enum btrfs_loop_type { |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6600 | LOOP_CACHING_NOWAIT = 0, |
| 6601 | LOOP_CACHING_WAIT = 1, |
| 6602 | LOOP_ALLOC_CHUNK = 2, |
| 6603 | LOOP_NO_EMPTY_SIZE = 3, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6604 | }; |
| 6605 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6606 | static inline void |
| 6607 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, |
| 6608 | int delalloc) |
| 6609 | { |
| 6610 | if (delalloc) |
| 6611 | down_read(&cache->data_rwsem); |
| 6612 | } |
| 6613 | |
| 6614 | static inline void |
| 6615 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, |
| 6616 | int delalloc) |
| 6617 | { |
| 6618 | btrfs_get_block_group(cache); |
| 6619 | if (delalloc) |
| 6620 | down_read(&cache->data_rwsem); |
| 6621 | } |
| 6622 | |
| 6623 | static struct btrfs_block_group_cache * |
| 6624 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, |
| 6625 | struct btrfs_free_cluster *cluster, |
| 6626 | int delalloc) |
| 6627 | { |
| 6628 | struct btrfs_block_group_cache *used_bg; |
| 6629 | bool locked = false; |
| 6630 | again: |
| 6631 | spin_lock(&cluster->refill_lock); |
| 6632 | if (locked) { |
| 6633 | if (used_bg == cluster->block_group) |
| 6634 | return used_bg; |
| 6635 | |
| 6636 | up_read(&used_bg->data_rwsem); |
| 6637 | btrfs_put_block_group(used_bg); |
| 6638 | } |
| 6639 | |
| 6640 | used_bg = cluster->block_group; |
| 6641 | if (!used_bg) |
| 6642 | return NULL; |
| 6643 | |
| 6644 | if (used_bg == block_group) |
| 6645 | return used_bg; |
| 6646 | |
| 6647 | btrfs_get_block_group(used_bg); |
| 6648 | |
| 6649 | if (!delalloc) |
| 6650 | return used_bg; |
| 6651 | |
| 6652 | if (down_read_trylock(&used_bg->data_rwsem)) |
| 6653 | return used_bg; |
| 6654 | |
| 6655 | spin_unlock(&cluster->refill_lock); |
| 6656 | down_read(&used_bg->data_rwsem); |
| 6657 | locked = true; |
| 6658 | goto again; |
| 6659 | } |
| 6660 | |
| 6661 | static inline void |
| 6662 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, |
| 6663 | int delalloc) |
| 6664 | { |
| 6665 | if (delalloc) |
| 6666 | up_read(&cache->data_rwsem); |
| 6667 | btrfs_put_block_group(cache); |
| 6668 | } |
| 6669 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6670 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6671 | * walks the btree of allocated extents and find a hole of a given size. |
| 6672 | * The key ins is changed to record the hole: |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6673 | * ins->objectid == start position |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 6674 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6675 | * ins->offset == the size of the hole. |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6676 | * Any available blocks before search_start are skipped. |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6677 | * |
| 6678 | * If there is no suitable free space, we will record the max size of |
| 6679 | * the free space extent currently. |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6680 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6681 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6682 | u64 num_bytes, u64 empty_size, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6683 | u64 hint_byte, struct btrfs_key *ins, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6684 | u64 flags, int delalloc) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6685 | { |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6686 | int ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6687 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6688 | struct btrfs_free_cluster *last_ptr = NULL; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6689 | struct btrfs_block_group_cache *block_group = NULL; |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 6690 | u64 search_start = 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6691 | u64 max_extent_size = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6692 | int empty_cluster = 2 * 1024 * 1024; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6693 | struct btrfs_space_info *space_info; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6694 | int loop = 0; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6695 | int index = __get_raid_index(flags); |
| 6696 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6697 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6698 | bool failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6699 | bool failed_alloc = false; |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6700 | bool use_cluster = true; |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6701 | bool have_caching_bg = false; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6702 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 6703 | WARN_ON(num_bytes < root->sectorsize); |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 6704 | ins->type = BTRFS_EXTENT_ITEM_KEY; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6705 | ins->objectid = 0; |
| 6706 | ins->offset = 0; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 6707 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6708 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6709 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6710 | space_info = __find_space_info(root->fs_info, flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6711 | if (!space_info) { |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6712 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6713 | return -ENOSPC; |
| 6714 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6715 | |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6716 | /* |
| 6717 | * If the space info is for both data and metadata it means we have a |
| 6718 | * small filesystem and we can't use the clustering stuff. |
| 6719 | */ |
| 6720 | if (btrfs_mixed_space_info(space_info)) |
| 6721 | use_cluster = false; |
| 6722 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6723 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6724 | last_ptr = &root->fs_info->meta_alloc_cluster; |
Chris Mason | 536ac8a | 2009-02-12 09:41:38 -0500 | [diff] [blame] | 6725 | if (!btrfs_test_opt(root, SSD)) |
| 6726 | empty_cluster = 64 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6727 | } |
| 6728 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6729 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6730 | btrfs_test_opt(root, SSD)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6731 | last_ptr = &root->fs_info->data_alloc_cluster; |
| 6732 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6733 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6734 | if (last_ptr) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6735 | spin_lock(&last_ptr->lock); |
| 6736 | if (last_ptr->block_group) |
| 6737 | hint_byte = last_ptr->window_start; |
| 6738 | spin_unlock(&last_ptr->lock); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6739 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6740 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 6741 | search_start = max(search_start, first_logical_byte(root, 0)); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6742 | search_start = max(search_start, hint_byte); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6743 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6744 | if (!last_ptr) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6745 | empty_cluster = 0; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6746 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6747 | if (search_start == hint_byte) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6748 | block_group = btrfs_lookup_block_group(root->fs_info, |
| 6749 | search_start); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6750 | /* |
| 6751 | * we don't want to use the block group if it doesn't match our |
| 6752 | * allocation bits, or if its not cached. |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6753 | * |
| 6754 | * However if we are re-searching with an ideal block group |
| 6755 | * picked out then we don't care that the block group is cached. |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6756 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6757 | if (block_group && block_group_bits(block_group, flags) && |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6758 | block_group->cached != BTRFS_CACHE_NO) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6759 | down_read(&space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6760 | if (list_empty(&block_group->list) || |
| 6761 | block_group->ro) { |
| 6762 | /* |
| 6763 | * someone is removing this block group, |
| 6764 | * we can't jump into the have_block_group |
| 6765 | * target because our list pointers are not |
| 6766 | * valid |
| 6767 | */ |
| 6768 | btrfs_put_block_group(block_group); |
| 6769 | up_read(&space_info->groups_sem); |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6770 | } else { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6771 | index = get_block_group_index(block_group); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6772 | btrfs_lock_block_group(block_group, delalloc); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6773 | goto have_block_group; |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6774 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6775 | } else if (block_group) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6776 | btrfs_put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6777 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6778 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6779 | search: |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6780 | have_caching_bg = false; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6781 | down_read(&space_info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6782 | list_for_each_entry(block_group, &space_info->block_groups[index], |
| 6783 | list) { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6784 | u64 offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6785 | int cached; |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 6786 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6787 | btrfs_grab_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6788 | search_start = block_group->key.objectid; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6789 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6790 | /* |
| 6791 | * this can happen if we end up cycling through all the |
| 6792 | * raid types, but we want to make sure we only allocate |
| 6793 | * for the proper type. |
| 6794 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6795 | if (!block_group_bits(block_group, flags)) { |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6796 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
| 6797 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6798 | BTRFS_BLOCK_GROUP_RAID5 | |
| 6799 | BTRFS_BLOCK_GROUP_RAID6 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6800 | BTRFS_BLOCK_GROUP_RAID10; |
| 6801 | |
| 6802 | /* |
| 6803 | * if they asked for extra copies and this block group |
| 6804 | * doesn't provide them, bail. This does allow us to |
| 6805 | * fill raid0 from raid1. |
| 6806 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6807 | if ((flags & extra) && !(block_group->flags & extra)) |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6808 | goto loop; |
| 6809 | } |
| 6810 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6811 | have_block_group: |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 6812 | cached = block_group_cache_done(block_group); |
| 6813 | if (unlikely(!cached)) { |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 6814 | ret = cache_block_group(block_group, 0); |
Chris Mason | 1d4284b | 2012-03-28 20:31:37 -0400 | [diff] [blame] | 6815 | BUG_ON(ret < 0); |
| 6816 | ret = 0; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6817 | } |
| 6818 | |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6819 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
| 6820 | goto loop; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6821 | if (unlikely(block_group->ro)) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6822 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6823 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6824 | /* |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6825 | * Ok we want to try and use the cluster allocator, so |
| 6826 | * lets look there |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6827 | */ |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6828 | if (last_ptr) { |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6829 | struct btrfs_block_group_cache *used_block_group; |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6830 | unsigned long aligned_cluster; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6831 | /* |
| 6832 | * the refill lock keeps out other |
| 6833 | * people trying to start a new cluster |
| 6834 | */ |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6835 | used_block_group = btrfs_lock_cluster(block_group, |
| 6836 | last_ptr, |
| 6837 | delalloc); |
| 6838 | if (!used_block_group) |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6839 | goto refill_cluster; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6840 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6841 | if (used_block_group != block_group && |
| 6842 | (used_block_group->ro || |
| 6843 | !block_group_bits(used_block_group, flags))) |
| 6844 | goto release_cluster; |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6845 | |
| 6846 | offset = btrfs_alloc_from_cluster(used_block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6847 | last_ptr, |
| 6848 | num_bytes, |
| 6849 | used_block_group->key.objectid, |
| 6850 | &max_extent_size); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6851 | if (offset) { |
| 6852 | /* we have a block, we're done */ |
| 6853 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6854 | trace_btrfs_reserve_extent_cluster(root, |
Miao Xie | 89d4346 | 2014-01-15 20:00:57 +0800 | [diff] [blame] | 6855 | used_block_group, |
| 6856 | search_start, num_bytes); |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6857 | if (used_block_group != block_group) { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6858 | btrfs_release_block_group(block_group, |
| 6859 | delalloc); |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6860 | block_group = used_block_group; |
| 6861 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6862 | goto checks; |
| 6863 | } |
| 6864 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6865 | WARN_ON(last_ptr->block_group != used_block_group); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6866 | release_cluster: |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6867 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
| 6868 | * set up a new clusters, so lets just skip it |
| 6869 | * and let the allocator find whatever block |
| 6870 | * it can find. If we reach this point, we |
| 6871 | * will have tried the cluster allocator |
| 6872 | * plenty of times and not have found |
| 6873 | * anything, so we are likely way too |
| 6874 | * fragmented for the clustering stuff to find |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6875 | * anything. |
| 6876 | * |
| 6877 | * However, if the cluster is taken from the |
| 6878 | * current block group, release the cluster |
| 6879 | * first, so that we stand a better chance of |
| 6880 | * succeeding in the unclustered |
| 6881 | * allocation. */ |
| 6882 | if (loop >= LOOP_NO_EMPTY_SIZE && |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6883 | used_block_group != block_group) { |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6884 | spin_unlock(&last_ptr->refill_lock); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6885 | btrfs_release_block_group(used_block_group, |
| 6886 | delalloc); |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6887 | goto unclustered_alloc; |
| 6888 | } |
| 6889 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6890 | /* |
| 6891 | * this cluster didn't work out, free it and |
| 6892 | * start over |
| 6893 | */ |
| 6894 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
| 6895 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6896 | if (used_block_group != block_group) |
| 6897 | btrfs_release_block_group(used_block_group, |
| 6898 | delalloc); |
| 6899 | refill_cluster: |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6900 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
| 6901 | spin_unlock(&last_ptr->refill_lock); |
| 6902 | goto unclustered_alloc; |
| 6903 | } |
| 6904 | |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6905 | aligned_cluster = max_t(unsigned long, |
| 6906 | empty_cluster + empty_size, |
| 6907 | block_group->full_stripe_len); |
| 6908 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6909 | /* allocate a cluster in this block group */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6910 | ret = btrfs_find_space_cluster(root, block_group, |
| 6911 | last_ptr, search_start, |
| 6912 | num_bytes, |
| 6913 | aligned_cluster); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6914 | if (ret == 0) { |
| 6915 | /* |
| 6916 | * now pull our allocation out of this |
| 6917 | * cluster |
| 6918 | */ |
| 6919 | offset = btrfs_alloc_from_cluster(block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6920 | last_ptr, |
| 6921 | num_bytes, |
| 6922 | search_start, |
| 6923 | &max_extent_size); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6924 | if (offset) { |
| 6925 | /* we found one, proceed */ |
| 6926 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6927 | trace_btrfs_reserve_extent_cluster(root, |
| 6928 | block_group, search_start, |
| 6929 | num_bytes); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6930 | goto checks; |
| 6931 | } |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6932 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
| 6933 | && !failed_cluster_refill) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6934 | spin_unlock(&last_ptr->refill_lock); |
| 6935 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6936 | failed_cluster_refill = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6937 | wait_block_group_cache_progress(block_group, |
| 6938 | num_bytes + empty_cluster + empty_size); |
| 6939 | goto have_block_group; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6940 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6941 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6942 | /* |
| 6943 | * at this point we either didn't find a cluster |
| 6944 | * or we weren't able to allocate a block from our |
| 6945 | * cluster. Free the cluster we've been trying |
| 6946 | * to use, and go to the next block group |
| 6947 | */ |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6948 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6949 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6950 | goto loop; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6951 | } |
| 6952 | |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6953 | unclustered_alloc: |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6954 | spin_lock(&block_group->free_space_ctl->tree_lock); |
| 6955 | if (cached && |
| 6956 | block_group->free_space_ctl->free_space < |
| 6957 | num_bytes + empty_cluster + empty_size) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6958 | if (block_group->free_space_ctl->free_space > |
| 6959 | max_extent_size) |
| 6960 | max_extent_size = |
| 6961 | block_group->free_space_ctl->free_space; |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6962 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6963 | goto loop; |
| 6964 | } |
| 6965 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6966 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6967 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6968 | num_bytes, empty_size, |
| 6969 | &max_extent_size); |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6970 | /* |
| 6971 | * If we didn't find a chunk, and we haven't failed on this |
| 6972 | * block group before, and this block group is in the middle of |
| 6973 | * caching and we are ok with waiting, then go ahead and wait |
| 6974 | * for progress to be made, and set failed_alloc to true. |
| 6975 | * |
| 6976 | * If failed_alloc is true then we've already waited on this |
| 6977 | * block group once and should move on to the next block group. |
| 6978 | */ |
| 6979 | if (!offset && !failed_alloc && !cached && |
| 6980 | loop > LOOP_CACHING_NOWAIT) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6981 | wait_block_group_cache_progress(block_group, |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6982 | num_bytes + empty_size); |
| 6983 | failed_alloc = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6984 | goto have_block_group; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6985 | } else if (!offset) { |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6986 | if (!cached) |
| 6987 | have_caching_bg = true; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6988 | goto loop; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6989 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6990 | checks: |
David Sterba | 4e54b17 | 2014-06-05 01:39:19 +0200 | [diff] [blame] | 6991 | search_start = ALIGN(offset, root->stripesize); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 6992 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6993 | /* move on to the next group */ |
| 6994 | if (search_start + num_bytes > |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6995 | block_group->key.objectid + block_group->key.offset) { |
| 6996 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6997 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6998 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6999 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 7000 | if (offset < search_start) |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 7001 | btrfs_add_free_space(block_group, offset, |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 7002 | search_start - offset); |
| 7003 | BUG_ON(offset > search_start); |
| 7004 | |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 7005 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7006 | alloc_type, delalloc); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7007 | if (ret == -EAGAIN) { |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 7008 | btrfs_add_free_space(block_group, offset, num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7009 | goto loop; |
| 7010 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 7011 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 7012 | /* we are all good, lets return */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7013 | ins->objectid = search_start; |
| 7014 | ins->offset = num_bytes; |
| 7015 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 7016 | trace_btrfs_reserve_extent(orig_root, block_group, |
| 7017 | search_start, num_bytes); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7018 | btrfs_release_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 7019 | break; |
| 7020 | loop: |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 7021 | failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 7022 | failed_alloc = false; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7023 | BUG_ON(index != get_block_group_index(block_group)); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7024 | btrfs_release_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 7025 | } |
| 7026 | up_read(&space_info->groups_sem); |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 7027 | |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 7028 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
| 7029 | goto search; |
| 7030 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7031 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
| 7032 | goto search; |
| 7033 | |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 7034 | /* |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 7035 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
| 7036 | * caching kthreads as we move along |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 7037 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
| 7038 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again |
| 7039 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try |
| 7040 | * again |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 7041 | */ |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 7042 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7043 | index = 0; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 7044 | loop++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 7045 | if (loop == LOOP_ALLOC_CHUNK) { |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7046 | struct btrfs_trans_handle *trans; |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 7047 | int exist = 0; |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7048 | |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 7049 | trans = current->journal_info; |
| 7050 | if (trans) |
| 7051 | exist = 1; |
| 7052 | else |
| 7053 | trans = btrfs_join_transaction(root); |
| 7054 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7055 | if (IS_ERR(trans)) { |
| 7056 | ret = PTR_ERR(trans); |
| 7057 | goto out; |
| 7058 | } |
| 7059 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 7060 | ret = do_chunk_alloc(trans, root, flags, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 7061 | CHUNK_ALLOC_FORCE); |
| 7062 | /* |
| 7063 | * Do not bail out on ENOSPC since we |
| 7064 | * can do more things. |
| 7065 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7066 | if (ret < 0 && ret != -ENOSPC) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 7067 | btrfs_abort_transaction(trans, |
| 7068 | root, ret); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7069 | else |
| 7070 | ret = 0; |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 7071 | if (!exist) |
| 7072 | btrfs_end_transaction(trans, root); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7073 | if (ret) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 7074 | goto out; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 7075 | } |
| 7076 | |
| 7077 | if (loop == LOOP_NO_EMPTY_SIZE) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 7078 | empty_size = 0; |
| 7079 | empty_cluster = 0; |
| 7080 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 7081 | |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 7082 | goto search; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 7083 | } else if (!ins->objectid) { |
| 7084 | ret = -ENOSPC; |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 7085 | } else if (ins->objectid) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 7086 | ret = 0; |
| 7087 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7088 | out: |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 7089 | if (ret == -ENOSPC) |
| 7090 | ins->offset = max_extent_size; |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 7091 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7092 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7093 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7094 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 7095 | int dump_block_groups) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7096 | { |
| 7097 | struct btrfs_block_group_cache *cache; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7098 | int index = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7099 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7100 | spin_lock(&info->lock); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 7101 | printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7102 | info->flags, |
| 7103 | info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 7104 | info->bytes_reserved - info->bytes_readonly, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7105 | (info->full) ? "" : "not "); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 7106 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 7107 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7108 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
| 7109 | info->bytes_reserved, info->bytes_may_use, |
| 7110 | info->bytes_readonly); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7111 | spin_unlock(&info->lock); |
| 7112 | |
| 7113 | if (!dump_block_groups) |
| 7114 | return; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7115 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7116 | down_read(&info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7117 | again: |
| 7118 | list_for_each_entry(cache, &info->block_groups[index], list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7119 | spin_lock(&cache->lock); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 7120 | printk(KERN_INFO "BTRFS: " |
| 7121 | "block group %llu has %llu bytes, " |
| 7122 | "%llu used %llu pinned %llu reserved %s\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7123 | cache->key.objectid, cache->key.offset, |
| 7124 | btrfs_block_group_used(&cache->item), cache->pinned, |
| 7125 | cache->reserved, cache->ro ? "[readonly]" : ""); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7126 | btrfs_dump_free_space(cache, bytes); |
| 7127 | spin_unlock(&cache->lock); |
| 7128 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 7129 | if (++index < BTRFS_NR_RAID_TYPES) |
| 7130 | goto again; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7131 | up_read(&info->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7132 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 7133 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7134 | int btrfs_reserve_extent(struct btrfs_root *root, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 7135 | u64 num_bytes, u64 min_alloc_size, |
| 7136 | u64 empty_size, u64 hint_byte, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7137 | struct btrfs_key *ins, int is_data, int delalloc) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7138 | { |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 7139 | bool final_tried = false; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 7140 | u64 flags; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7141 | int ret; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 7142 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 7143 | flags = btrfs_get_alloc_profile(root, is_data); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 7144 | again: |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 7145 | WARN_ON(num_bytes < root->sectorsize); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7146 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7147 | flags, delalloc); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 7148 | |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 7149 | if (ret == -ENOSPC) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 7150 | if (!final_tried && ins->offset) { |
| 7151 | num_bytes = min(num_bytes >> 1, ins->offset); |
Zach Brown | 24542bf | 2012-11-16 00:04:43 +0000 | [diff] [blame] | 7152 | num_bytes = round_down(num_bytes, root->sectorsize); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 7153 | num_bytes = max(num_bytes, min_alloc_size); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 7154 | if (num_bytes == min_alloc_size) |
| 7155 | final_tried = true; |
| 7156 | goto again; |
| 7157 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 7158 | struct btrfs_space_info *sinfo; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7159 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 7160 | sinfo = __find_space_info(root->fs_info, flags); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7161 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7162 | flags, num_bytes); |
Jeff Mahoney | 5380428 | 2012-03-01 14:56:28 +0100 | [diff] [blame] | 7163 | if (sinfo) |
| 7164 | dump_space_info(sinfo, num_bytes, 1); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 7165 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 7166 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7167 | |
| 7168 | return ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7169 | } |
| 7170 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7171 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7172 | u64 start, u64 len, |
| 7173 | int pin, int delalloc) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7174 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7175 | struct btrfs_block_group_cache *cache; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 7176 | int ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7177 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7178 | cache = btrfs_lookup_block_group(root->fs_info, start); |
| 7179 | if (!cache) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7180 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7181 | start); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7182 | return -ENOSPC; |
| 7183 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 7184 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7185 | if (pin) |
| 7186 | pin_down_extent(root, cache, start, len, 1); |
| 7187 | else { |
Filipe Manana | dcc82f4 | 2015-03-23 14:07:40 +0000 | [diff] [blame] | 7188 | if (btrfs_test_opt(root, DISCARD)) |
| 7189 | ret = btrfs_discard_extent(root, start, len, NULL); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7190 | btrfs_add_free_space(cache, start, len); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7191 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7192 | } |
Dongsheng Yang | 3119321 | 2014-12-12 16:44:35 +0800 | [diff] [blame] | 7193 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 7194 | btrfs_put_block_group(cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 7195 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 7196 | trace_btrfs_reserved_extent_free(root, start, len); |
| 7197 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7198 | return ret; |
| 7199 | } |
| 7200 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7201 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7202 | u64 start, u64 len, int delalloc) |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7203 | { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7204 | return __btrfs_free_reserved_extent(root, start, len, 0, delalloc); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7205 | } |
| 7206 | |
| 7207 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, |
| 7208 | u64 start, u64 len) |
| 7209 | { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7210 | return __btrfs_free_reserved_extent(root, start, len, 1, 0); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 7211 | } |
| 7212 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7213 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 7214 | struct btrfs_root *root, |
| 7215 | u64 parent, u64 root_objectid, |
| 7216 | u64 flags, u64 owner, u64 offset, |
| 7217 | struct btrfs_key *ins, int ref_mod) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7218 | { |
| 7219 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7220 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7221 | struct btrfs_extent_item *extent_item; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7222 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7223 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7224 | struct extent_buffer *leaf; |
| 7225 | int type; |
| 7226 | u32 size; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 7227 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7228 | if (parent > 0) |
| 7229 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 7230 | else |
| 7231 | type = BTRFS_EXTENT_DATA_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 7232 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7233 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 7234 | |
| 7235 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 7236 | if (!path) |
| 7237 | return -ENOMEM; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7238 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 7239 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7240 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 7241 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7242 | if (ret) { |
| 7243 | btrfs_free_path(path); |
| 7244 | return ret; |
| 7245 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7246 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7247 | leaf = path->nodes[0]; |
| 7248 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7249 | struct btrfs_extent_item); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7250 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
| 7251 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 7252 | btrfs_set_extent_flags(leaf, extent_item, |
| 7253 | flags | BTRFS_EXTENT_FLAG_DATA); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7254 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7255 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
| 7256 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 7257 | if (parent > 0) { |
| 7258 | struct btrfs_shared_data_ref *ref; |
| 7259 | ref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 7260 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 7261 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); |
| 7262 | } else { |
| 7263 | struct btrfs_extent_data_ref *ref; |
| 7264 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 7265 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); |
| 7266 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 7267 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 7268 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); |
| 7269 | } |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7270 | |
| 7271 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 7272 | btrfs_free_path(path); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 7273 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7274 | /* Always set parent to 0 here since its exclusive anyway. */ |
| 7275 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 7276 | ins->objectid, ins->offset, |
| 7277 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); |
| 7278 | if (ret) |
| 7279 | return ret; |
| 7280 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 7281 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7282 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7283 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7284 | ins->objectid, ins->offset); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 7285 | BUG(); |
| 7286 | } |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 7287 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7288 | return ret; |
| 7289 | } |
| 7290 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7291 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 7292 | struct btrfs_root *root, |
| 7293 | u64 parent, u64 root_objectid, |
| 7294 | u64 flags, struct btrfs_disk_key *key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7295 | int level, struct btrfs_key *ins, |
| 7296 | int no_quota) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7297 | { |
| 7298 | int ret; |
| 7299 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 7300 | struct btrfs_extent_item *extent_item; |
| 7301 | struct btrfs_tree_block_info *block_info; |
| 7302 | struct btrfs_extent_inline_ref *iref; |
| 7303 | struct btrfs_path *path; |
| 7304 | struct extent_buffer *leaf; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7305 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7306 | u64 num_bytes = ins->offset; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7307 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 7308 | SKINNY_METADATA); |
| 7309 | |
| 7310 | if (!skinny_metadata) |
| 7311 | size += sizeof(*block_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7312 | |
| 7313 | path = btrfs_alloc_path(); |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7314 | if (!path) { |
| 7315 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 7316 | root->nodesize); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 7317 | return -ENOMEM; |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7318 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7319 | |
| 7320 | path->leave_spinning = 1; |
| 7321 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 7322 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7323 | if (ret) { |
Chris Mason | dd82525 | 2015-04-01 08:36:05 -0700 | [diff] [blame] | 7324 | btrfs_free_path(path); |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7325 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 7326 | root->nodesize); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7327 | return ret; |
| 7328 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7329 | |
| 7330 | leaf = path->nodes[0]; |
| 7331 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
| 7332 | struct btrfs_extent_item); |
| 7333 | btrfs_set_extent_refs(leaf, extent_item, 1); |
| 7334 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 7335 | btrfs_set_extent_flags(leaf, extent_item, |
| 7336 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7337 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7338 | if (skinny_metadata) { |
| 7339 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 7340 | num_bytes = root->nodesize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7341 | } else { |
| 7342 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); |
| 7343 | btrfs_set_tree_block_key(leaf, block_info, key); |
| 7344 | btrfs_set_tree_block_level(leaf, block_info, level); |
| 7345 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); |
| 7346 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7347 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7348 | if (parent > 0) { |
| 7349 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); |
| 7350 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 7351 | BTRFS_SHARED_BLOCK_REF_KEY); |
| 7352 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 7353 | } else { |
| 7354 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 7355 | BTRFS_TREE_BLOCK_REF_KEY); |
| 7356 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 7357 | } |
| 7358 | |
| 7359 | btrfs_mark_buffer_dirty(leaf); |
| 7360 | btrfs_free_path(path); |
| 7361 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7362 | if (!no_quota) { |
| 7363 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 7364 | ins->objectid, num_bytes, |
| 7365 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); |
| 7366 | if (ret) |
| 7367 | return ret; |
| 7368 | } |
| 7369 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 7370 | ret = update_block_group(trans, root, ins->objectid, root->nodesize, |
| 7371 | 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7372 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7373 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7374 | ins->objectid, ins->offset); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7375 | BUG(); |
| 7376 | } |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 7377 | |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 7378 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->nodesize); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7379 | return ret; |
| 7380 | } |
| 7381 | |
| 7382 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 7383 | struct btrfs_root *root, |
| 7384 | u64 root_objectid, u64 owner, |
| 7385 | u64 offset, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7386 | { |
| 7387 | int ret; |
Chris Mason | 1c2308f | 2008-09-23 13:14:13 -0400 | [diff] [blame] | 7388 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7389 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 7390 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7391 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
| 7392 | ins->offset, 0, |
| 7393 | root_objectid, owner, offset, |
| 7394 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7395 | return ret; |
| 7396 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7397 | |
| 7398 | /* |
| 7399 | * this is used by the tree logging recovery code. It records that |
| 7400 | * an extent has been allocated and makes sure to clear the free |
| 7401 | * space cache bits as well |
| 7402 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7403 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
| 7404 | struct btrfs_root *root, |
| 7405 | u64 root_objectid, u64 owner, u64 offset, |
| 7406 | struct btrfs_key *ins) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7407 | { |
| 7408 | int ret; |
| 7409 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 7410 | |
| 7411 | /* |
| 7412 | * Mixed block groups will exclude before processing the log so we only |
| 7413 | * need to do the exlude dance if this fs isn't mixed. |
| 7414 | */ |
| 7415 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { |
| 7416 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); |
| 7417 | if (ret) |
| 7418 | return ret; |
| 7419 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7420 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7421 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 7422 | if (!block_group) |
| 7423 | return -EINVAL; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 7424 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 7425 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7426 | RESERVE_ALLOC_NO_ACCOUNT, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7427 | BUG_ON(ret); /* logic error */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7428 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
| 7429 | 0, owner, offset, ins, 1); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 7430 | btrfs_put_block_group(block_group); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7431 | return ret; |
| 7432 | } |
| 7433 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 7434 | static struct extent_buffer * |
| 7435 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
David Sterba | fe86457 | 2014-06-15 02:28:42 +0200 | [diff] [blame] | 7436 | u64 bytenr, int level) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7437 | { |
| 7438 | struct extent_buffer *buf; |
| 7439 | |
David Sterba | a83fffb | 2014-06-15 02:39:54 +0200 | [diff] [blame] | 7440 | buf = btrfs_find_create_tree_block(root, bytenr); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7441 | if (!buf) |
| 7442 | return ERR_PTR(-ENOMEM); |
| 7443 | btrfs_set_header_generation(buf, trans->transid); |
Chris Mason | 85d4e46 | 2011-07-26 16:11:19 -0400 | [diff] [blame] | 7444 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7445 | btrfs_tree_lock(buf); |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 7446 | clean_tree_block(trans, root->fs_info, buf); |
Josef Bacik | 3083ee2 | 2012-03-09 16:01:49 -0500 | [diff] [blame] | 7447 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7448 | |
| 7449 | btrfs_set_lock_blocking(buf); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7450 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7451 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 7452 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 7453 | buf->log_index = root->log_transid % 2; |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 7454 | /* |
| 7455 | * we allow two log transactions at a time, use different |
| 7456 | * EXENT bit to differentiate dirty pages. |
| 7457 | */ |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 7458 | if (buf->log_index == 0) |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 7459 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
| 7460 | buf->start + buf->len - 1, GFP_NOFS); |
| 7461 | else |
| 7462 | set_extent_new(&root->dirty_log_pages, buf->start, |
| 7463 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 7464 | } else { |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 7465 | buf->log_index = -1; |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 7466 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 7467 | buf->start + buf->len - 1, GFP_NOFS); |
| 7468 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7469 | trans->blocks_used++; |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7470 | /* this returns a buffer locked for blocking */ |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7471 | return buf; |
| 7472 | } |
| 7473 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7474 | static struct btrfs_block_rsv * |
| 7475 | use_block_rsv(struct btrfs_trans_handle *trans, |
| 7476 | struct btrfs_root *root, u32 blocksize) |
| 7477 | { |
| 7478 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 68a8227 | 2011-01-24 21:43:20 +0000 | [diff] [blame] | 7479 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7480 | int ret; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7481 | bool global_updated = false; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7482 | |
| 7483 | block_rsv = get_block_rsv(trans, root); |
| 7484 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7485 | if (unlikely(block_rsv->size == 0)) |
| 7486 | goto try_reserve; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7487 | again: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7488 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
| 7489 | if (!ret) |
| 7490 | return block_rsv; |
| 7491 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7492 | if (block_rsv->failfast) |
| 7493 | return ERR_PTR(ret); |
| 7494 | |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7495 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
| 7496 | global_updated = true; |
| 7497 | update_global_block_rsv(root->fs_info); |
| 7498 | goto again; |
| 7499 | } |
| 7500 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7501 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 7502 | static DEFINE_RATELIMIT_STATE(_rs, |
| 7503 | DEFAULT_RATELIMIT_INTERVAL * 10, |
| 7504 | /*DEFAULT_RATELIMIT_BURST*/ 1); |
| 7505 | if (__ratelimit(&_rs)) |
| 7506 | WARN(1, KERN_DEBUG |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 7507 | "BTRFS: block rsv returned %d\n", ret); |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7508 | } |
| 7509 | try_reserve: |
| 7510 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
| 7511 | BTRFS_RESERVE_NO_FLUSH); |
| 7512 | if (!ret) |
| 7513 | return block_rsv; |
| 7514 | /* |
| 7515 | * If we couldn't reserve metadata bytes try and use some from |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 7516 | * the global reserve if its space type is the same as the global |
| 7517 | * reservation. |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7518 | */ |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 7519 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
| 7520 | block_rsv->space_info == global_rsv->space_info) { |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7521 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
| 7522 | if (!ret) |
| 7523 | return global_rsv; |
| 7524 | } |
| 7525 | return ERR_PTR(ret); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7526 | } |
| 7527 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7528 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
| 7529 | struct btrfs_block_rsv *block_rsv, u32 blocksize) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7530 | { |
| 7531 | block_rsv_add_bytes(block_rsv, blocksize, 0); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7532 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7533 | } |
| 7534 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7535 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7536 | * finds a free extent and does all the dirty work required for allocation |
| 7537 | * returns the key for the extent through ins, and a tree buffer for |
| 7538 | * the first block of the extent through buf. |
| 7539 | * |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7540 | * returns the tree buffer or NULL. |
| 7541 | */ |
David Sterba | 4d75f8a | 2014-06-15 01:54:12 +0200 | [diff] [blame] | 7542 | struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, |
| 7543 | struct btrfs_root *root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7544 | u64 parent, u64 root_objectid, |
| 7545 | struct btrfs_disk_key *key, int level, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7546 | u64 hint, u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7547 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 7548 | struct btrfs_key ins; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7549 | struct btrfs_block_rsv *block_rsv; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7550 | struct extent_buffer *buf; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7551 | u64 flags = 0; |
| 7552 | int ret; |
David Sterba | 4d75f8a | 2014-06-15 01:54:12 +0200 | [diff] [blame] | 7553 | u32 blocksize = root->nodesize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7554 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 7555 | SKINNY_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7556 | |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 7557 | if (btrfs_test_is_dummy_root(root)) { |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 7558 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, |
David Sterba | fe86457 | 2014-06-15 02:28:42 +0200 | [diff] [blame] | 7559 | level); |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 7560 | if (!IS_ERR(buf)) |
| 7561 | root->alloc_bytenr += blocksize; |
| 7562 | return buf; |
| 7563 | } |
David Sterba | fccb84c | 2014-09-29 23:53:21 +0200 | [diff] [blame] | 7564 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7565 | block_rsv = use_block_rsv(trans, root, blocksize); |
| 7566 | if (IS_ERR(block_rsv)) |
| 7567 | return ERR_CAST(block_rsv); |
| 7568 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7569 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7570 | empty_size, hint, &ins, 0, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7571 | if (ret) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7572 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7573 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7574 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 7575 | |
David Sterba | fe86457 | 2014-06-15 02:28:42 +0200 | [diff] [blame] | 7576 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, level); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7577 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7578 | |
| 7579 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| 7580 | if (parent == 0) |
| 7581 | parent = ins.objectid; |
| 7582 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7583 | } else |
| 7584 | BUG_ON(parent > 0); |
| 7585 | |
| 7586 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 7587 | struct btrfs_delayed_extent_op *extent_op; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 7588 | extent_op = btrfs_alloc_delayed_extent_op(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7589 | BUG_ON(!extent_op); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7590 | if (key) |
| 7591 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); |
| 7592 | else |
| 7593 | memset(&extent_op->key, 0, sizeof(extent_op->key)); |
| 7594 | extent_op->flags_to_set = flags; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7595 | if (skinny_metadata) |
| 7596 | extent_op->update_key = 0; |
| 7597 | else |
| 7598 | extent_op->update_key = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7599 | extent_op->update_flags = 1; |
| 7600 | extent_op->is_data = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 7601 | extent_op->level = level; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7602 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7603 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 7604 | ins.objectid, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7605 | ins.offset, parent, root_objectid, |
| 7606 | level, BTRFS_ADD_DELAYED_EXTENT, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7607 | extent_op, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7608 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7609 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7610 | return buf; |
| 7611 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 7612 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7613 | struct walk_control { |
| 7614 | u64 refs[BTRFS_MAX_LEVEL]; |
| 7615 | u64 flags[BTRFS_MAX_LEVEL]; |
| 7616 | struct btrfs_key update_progress; |
| 7617 | int stage; |
| 7618 | int level; |
| 7619 | int shared_level; |
| 7620 | int update_ref; |
| 7621 | int keep_locks; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7622 | int reada_slot; |
| 7623 | int reada_count; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7624 | int for_reloc; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7625 | }; |
| 7626 | |
| 7627 | #define DROP_REFERENCE 1 |
| 7628 | #define UPDATE_BACKREF 2 |
| 7629 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7630 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
| 7631 | struct btrfs_root *root, |
| 7632 | struct walk_control *wc, |
| 7633 | struct btrfs_path *path) |
| 7634 | { |
| 7635 | u64 bytenr; |
| 7636 | u64 generation; |
| 7637 | u64 refs; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7638 | u64 flags; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7639 | u32 nritems; |
| 7640 | u32 blocksize; |
| 7641 | struct btrfs_key key; |
| 7642 | struct extent_buffer *eb; |
| 7643 | int ret; |
| 7644 | int slot; |
| 7645 | int nread = 0; |
| 7646 | |
| 7647 | if (path->slots[wc->level] < wc->reada_slot) { |
| 7648 | wc->reada_count = wc->reada_count * 2 / 3; |
| 7649 | wc->reada_count = max(wc->reada_count, 2); |
| 7650 | } else { |
| 7651 | wc->reada_count = wc->reada_count * 3 / 2; |
| 7652 | wc->reada_count = min_t(int, wc->reada_count, |
| 7653 | BTRFS_NODEPTRS_PER_BLOCK(root)); |
| 7654 | } |
| 7655 | |
| 7656 | eb = path->nodes[wc->level]; |
| 7657 | nritems = btrfs_header_nritems(eb); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 7658 | blocksize = root->nodesize; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7659 | |
| 7660 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
| 7661 | if (nread >= wc->reada_count) |
| 7662 | break; |
| 7663 | |
| 7664 | cond_resched(); |
| 7665 | bytenr = btrfs_node_blockptr(eb, slot); |
| 7666 | generation = btrfs_node_ptr_generation(eb, slot); |
| 7667 | |
| 7668 | if (slot == path->slots[wc->level]) |
| 7669 | goto reada; |
| 7670 | |
| 7671 | if (wc->stage == UPDATE_BACKREF && |
| 7672 | generation <= root->root_key.offset) |
| 7673 | continue; |
| 7674 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7675 | /* We don't lock the tree block, it's OK to be racy here */ |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7676 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
| 7677 | wc->level - 1, 1, &refs, |
| 7678 | &flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7679 | /* We don't care about errors in readahead. */ |
| 7680 | if (ret < 0) |
| 7681 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7682 | BUG_ON(refs == 0); |
| 7683 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7684 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7685 | if (refs == 1) |
| 7686 | goto reada; |
| 7687 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7688 | if (wc->level == 1 && |
| 7689 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7690 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7691 | if (!wc->update_ref || |
| 7692 | generation <= root->root_key.offset) |
| 7693 | continue; |
| 7694 | btrfs_node_key_to_cpu(eb, &key, slot); |
| 7695 | ret = btrfs_comp_cpu_keys(&key, |
| 7696 | &wc->update_progress); |
| 7697 | if (ret < 0) |
| 7698 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7699 | } else { |
| 7700 | if (wc->level == 1 && |
| 7701 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7702 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7703 | } |
| 7704 | reada: |
David Sterba | d3e46fe | 2014-06-15 02:04:19 +0200 | [diff] [blame] | 7705 | readahead_tree_block(root, bytenr); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7706 | nread++; |
| 7707 | } |
| 7708 | wc->reada_slot = slot; |
| 7709 | } |
| 7710 | |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 7711 | static int account_leaf_items(struct btrfs_trans_handle *trans, |
| 7712 | struct btrfs_root *root, |
| 7713 | struct extent_buffer *eb) |
| 7714 | { |
| 7715 | int nr = btrfs_header_nritems(eb); |
| 7716 | int i, extent_type, ret; |
| 7717 | struct btrfs_key key; |
| 7718 | struct btrfs_file_extent_item *fi; |
| 7719 | u64 bytenr, num_bytes; |
| 7720 | |
| 7721 | for (i = 0; i < nr; i++) { |
| 7722 | btrfs_item_key_to_cpu(eb, &key, i); |
| 7723 | |
| 7724 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 7725 | continue; |
| 7726 | |
| 7727 | fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); |
| 7728 | /* filter out non qgroup-accountable extents */ |
| 7729 | extent_type = btrfs_file_extent_type(eb, fi); |
| 7730 | |
| 7731 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) |
| 7732 | continue; |
| 7733 | |
| 7734 | bytenr = btrfs_file_extent_disk_bytenr(eb, fi); |
| 7735 | if (!bytenr) |
| 7736 | continue; |
| 7737 | |
| 7738 | num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); |
| 7739 | |
| 7740 | ret = btrfs_qgroup_record_ref(trans, root->fs_info, |
| 7741 | root->objectid, |
| 7742 | bytenr, num_bytes, |
| 7743 | BTRFS_QGROUP_OPER_SUB_SUBTREE, 0); |
| 7744 | if (ret) |
| 7745 | return ret; |
| 7746 | } |
| 7747 | return 0; |
| 7748 | } |
| 7749 | |
| 7750 | /* |
| 7751 | * Walk up the tree from the bottom, freeing leaves and any interior |
| 7752 | * nodes which have had all slots visited. If a node (leaf or |
| 7753 | * interior) is freed, the node above it will have it's slot |
| 7754 | * incremented. The root node will never be freed. |
| 7755 | * |
| 7756 | * At the end of this function, we should have a path which has all |
| 7757 | * slots incremented to the next position for a search. If we need to |
| 7758 | * read a new node it will be NULL and the node above it will have the |
| 7759 | * correct slot selected for a later read. |
| 7760 | * |
| 7761 | * If we increment the root nodes slot counter past the number of |
| 7762 | * elements, 1 is returned to signal completion of the search. |
| 7763 | */ |
| 7764 | static int adjust_slots_upwards(struct btrfs_root *root, |
| 7765 | struct btrfs_path *path, int root_level) |
| 7766 | { |
| 7767 | int level = 0; |
| 7768 | int nr, slot; |
| 7769 | struct extent_buffer *eb; |
| 7770 | |
| 7771 | if (root_level == 0) |
| 7772 | return 1; |
| 7773 | |
| 7774 | while (level <= root_level) { |
| 7775 | eb = path->nodes[level]; |
| 7776 | nr = btrfs_header_nritems(eb); |
| 7777 | path->slots[level]++; |
| 7778 | slot = path->slots[level]; |
| 7779 | if (slot >= nr || level == 0) { |
| 7780 | /* |
| 7781 | * Don't free the root - we will detect this |
| 7782 | * condition after our loop and return a |
| 7783 | * positive value for caller to stop walking the tree. |
| 7784 | */ |
| 7785 | if (level != root_level) { |
| 7786 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
| 7787 | path->locks[level] = 0; |
| 7788 | |
| 7789 | free_extent_buffer(eb); |
| 7790 | path->nodes[level] = NULL; |
| 7791 | path->slots[level] = 0; |
| 7792 | } |
| 7793 | } else { |
| 7794 | /* |
| 7795 | * We have a valid slot to walk back down |
| 7796 | * from. Stop here so caller can process these |
| 7797 | * new nodes. |
| 7798 | */ |
| 7799 | break; |
| 7800 | } |
| 7801 | |
| 7802 | level++; |
| 7803 | } |
| 7804 | |
| 7805 | eb = path->nodes[root_level]; |
| 7806 | if (path->slots[root_level] >= btrfs_header_nritems(eb)) |
| 7807 | return 1; |
| 7808 | |
| 7809 | return 0; |
| 7810 | } |
| 7811 | |
| 7812 | /* |
| 7813 | * root_eb is the subtree root and is locked before this function is called. |
| 7814 | */ |
| 7815 | static int account_shared_subtree(struct btrfs_trans_handle *trans, |
| 7816 | struct btrfs_root *root, |
| 7817 | struct extent_buffer *root_eb, |
| 7818 | u64 root_gen, |
| 7819 | int root_level) |
| 7820 | { |
| 7821 | int ret = 0; |
| 7822 | int level; |
| 7823 | struct extent_buffer *eb = root_eb; |
| 7824 | struct btrfs_path *path = NULL; |
| 7825 | |
| 7826 | BUG_ON(root_level < 0 || root_level > BTRFS_MAX_LEVEL); |
| 7827 | BUG_ON(root_eb == NULL); |
| 7828 | |
| 7829 | if (!root->fs_info->quota_enabled) |
| 7830 | return 0; |
| 7831 | |
| 7832 | if (!extent_buffer_uptodate(root_eb)) { |
| 7833 | ret = btrfs_read_buffer(root_eb, root_gen); |
| 7834 | if (ret) |
| 7835 | goto out; |
| 7836 | } |
| 7837 | |
| 7838 | if (root_level == 0) { |
| 7839 | ret = account_leaf_items(trans, root, root_eb); |
| 7840 | goto out; |
| 7841 | } |
| 7842 | |
| 7843 | path = btrfs_alloc_path(); |
| 7844 | if (!path) |
| 7845 | return -ENOMEM; |
| 7846 | |
| 7847 | /* |
| 7848 | * Walk down the tree. Missing extent blocks are filled in as |
| 7849 | * we go. Metadata is accounted every time we read a new |
| 7850 | * extent block. |
| 7851 | * |
| 7852 | * When we reach a leaf, we account for file extent items in it, |
| 7853 | * walk back up the tree (adjusting slot pointers as we go) |
| 7854 | * and restart the search process. |
| 7855 | */ |
| 7856 | extent_buffer_get(root_eb); /* For path */ |
| 7857 | path->nodes[root_level] = root_eb; |
| 7858 | path->slots[root_level] = 0; |
| 7859 | path->locks[root_level] = 0; /* so release_path doesn't try to unlock */ |
| 7860 | walk_down: |
| 7861 | level = root_level; |
| 7862 | while (level >= 0) { |
| 7863 | if (path->nodes[level] == NULL) { |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 7864 | int parent_slot; |
| 7865 | u64 child_gen; |
| 7866 | u64 child_bytenr; |
| 7867 | |
| 7868 | /* We need to get child blockptr/gen from |
| 7869 | * parent before we can read it. */ |
| 7870 | eb = path->nodes[level + 1]; |
| 7871 | parent_slot = path->slots[level + 1]; |
| 7872 | child_bytenr = btrfs_node_blockptr(eb, parent_slot); |
| 7873 | child_gen = btrfs_node_ptr_generation(eb, parent_slot); |
| 7874 | |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 7875 | eb = read_tree_block(root, child_bytenr, child_gen); |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 7876 | if (!eb || !extent_buffer_uptodate(eb)) { |
| 7877 | ret = -EIO; |
| 7878 | goto out; |
| 7879 | } |
| 7880 | |
| 7881 | path->nodes[level] = eb; |
| 7882 | path->slots[level] = 0; |
| 7883 | |
| 7884 | btrfs_tree_read_lock(eb); |
| 7885 | btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); |
| 7886 | path->locks[level] = BTRFS_READ_LOCK_BLOCKING; |
| 7887 | |
| 7888 | ret = btrfs_qgroup_record_ref(trans, root->fs_info, |
| 7889 | root->objectid, |
| 7890 | child_bytenr, |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 7891 | root->nodesize, |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 7892 | BTRFS_QGROUP_OPER_SUB_SUBTREE, |
| 7893 | 0); |
| 7894 | if (ret) |
| 7895 | goto out; |
| 7896 | |
| 7897 | } |
| 7898 | |
| 7899 | if (level == 0) { |
| 7900 | ret = account_leaf_items(trans, root, path->nodes[level]); |
| 7901 | if (ret) |
| 7902 | goto out; |
| 7903 | |
| 7904 | /* Nonzero return here means we completed our search */ |
| 7905 | ret = adjust_slots_upwards(root, path, root_level); |
| 7906 | if (ret) |
| 7907 | break; |
| 7908 | |
| 7909 | /* Restart search with new slots */ |
| 7910 | goto walk_down; |
| 7911 | } |
| 7912 | |
| 7913 | level--; |
| 7914 | } |
| 7915 | |
| 7916 | ret = 0; |
| 7917 | out: |
| 7918 | btrfs_free_path(path); |
| 7919 | |
| 7920 | return ret; |
| 7921 | } |
| 7922 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7923 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7924 | * helper to process tree block while walking down the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7925 | * |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7926 | * when wc->stage == UPDATE_BACKREF, this function updates |
| 7927 | * back refs for pointers in the block. |
| 7928 | * |
| 7929 | * NOTE: return value 1 means we should stop walking down. |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7930 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7931 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
| 7932 | struct btrfs_root *root, |
| 7933 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7934 | struct walk_control *wc, int lookup_info) |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7935 | { |
| 7936 | int level = wc->level; |
| 7937 | struct extent_buffer *eb = path->nodes[level]; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7938 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7939 | int ret; |
| 7940 | |
| 7941 | if (wc->stage == UPDATE_BACKREF && |
| 7942 | btrfs_header_owner(eb) != root->root_key.objectid) |
| 7943 | return 1; |
| 7944 | |
| 7945 | /* |
| 7946 | * when reference count of tree block is 1, it won't increase |
| 7947 | * again. once full backref flag is set, we never clear it. |
| 7948 | */ |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7949 | if (lookup_info && |
| 7950 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || |
| 7951 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7952 | BUG_ON(!path->locks[level]); |
| 7953 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7954 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7955 | &wc->refs[level], |
| 7956 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7957 | BUG_ON(ret == -ENOMEM); |
| 7958 | if (ret) |
| 7959 | return ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7960 | BUG_ON(wc->refs[level] == 0); |
| 7961 | } |
| 7962 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7963 | if (wc->stage == DROP_REFERENCE) { |
| 7964 | if (wc->refs[level] > 1) |
| 7965 | return 1; |
| 7966 | |
| 7967 | if (path->locks[level] && !wc->keep_locks) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7968 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7969 | path->locks[level] = 0; |
| 7970 | } |
| 7971 | return 0; |
| 7972 | } |
| 7973 | |
| 7974 | /* wc->stage == UPDATE_BACKREF */ |
| 7975 | if (!(wc->flags[level] & flag)) { |
| 7976 | BUG_ON(!path->locks[level]); |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 7977 | ret = btrfs_inc_ref(trans, root, eb, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7978 | BUG_ON(ret); /* -ENOMEM */ |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 7979 | ret = btrfs_dec_ref(trans, root, eb, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7980 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7981 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 7982 | eb->len, flag, |
| 7983 | btrfs_header_level(eb), 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7984 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7985 | wc->flags[level] |= flag; |
| 7986 | } |
| 7987 | |
| 7988 | /* |
| 7989 | * the block is shared by multiple trees, so it's not good to |
| 7990 | * keep the tree lock |
| 7991 | */ |
| 7992 | if (path->locks[level] && level > 0) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7993 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7994 | path->locks[level] = 0; |
| 7995 | } |
| 7996 | return 0; |
| 7997 | } |
| 7998 | |
| 7999 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 8000 | * helper to process tree block pointer. |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8001 | * |
| 8002 | * when wc->stage == DROP_REFERENCE, this function checks |
| 8003 | * reference count of the block pointed to. if the block |
| 8004 | * is shared and we need update back refs for the subtree |
| 8005 | * rooted at the block, this function changes wc->stage to |
| 8006 | * UPDATE_BACKREF. if the block is shared and there is no |
| 8007 | * need to update back, this function drops the reference |
| 8008 | * to the block. |
| 8009 | * |
| 8010 | * NOTE: return value 1 means we should stop walking down. |
| 8011 | */ |
| 8012 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, |
| 8013 | struct btrfs_root *root, |
| 8014 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8015 | struct walk_control *wc, int *lookup_info) |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8016 | { |
| 8017 | u64 bytenr; |
| 8018 | u64 generation; |
| 8019 | u64 parent; |
| 8020 | u32 blocksize; |
| 8021 | struct btrfs_key key; |
| 8022 | struct extent_buffer *next; |
| 8023 | int level = wc->level; |
| 8024 | int reada = 0; |
| 8025 | int ret = 0; |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8026 | bool need_account = false; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8027 | |
| 8028 | generation = btrfs_node_ptr_generation(path->nodes[level], |
| 8029 | path->slots[level]); |
| 8030 | /* |
| 8031 | * if the lower level block was created before the snapshot |
| 8032 | * was created, we know there is no need to update back refs |
| 8033 | * for the subtree |
| 8034 | */ |
| 8035 | if (wc->stage == UPDATE_BACKREF && |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8036 | generation <= root->root_key.offset) { |
| 8037 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8038 | return 1; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8039 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8040 | |
| 8041 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 8042 | blocksize = root->nodesize; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8043 | |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 8044 | next = btrfs_find_tree_block(root->fs_info, bytenr); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8045 | if (!next) { |
David Sterba | a83fffb | 2014-06-15 02:39:54 +0200 | [diff] [blame] | 8046 | next = btrfs_find_create_tree_block(root, bytenr); |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 8047 | if (!next) |
| 8048 | return -ENOMEM; |
Josef Bacik | b2aaaa3 | 2013-07-05 17:05:38 -0400 | [diff] [blame] | 8049 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
| 8050 | level - 1); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8051 | reada = 1; |
| 8052 | } |
| 8053 | btrfs_tree_lock(next); |
| 8054 | btrfs_set_lock_blocking(next); |
| 8055 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 8056 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8057 | &wc->refs[level - 1], |
| 8058 | &wc->flags[level - 1]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8059 | if (ret < 0) { |
| 8060 | btrfs_tree_unlock(next); |
| 8061 | return ret; |
| 8062 | } |
| 8063 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 8064 | if (unlikely(wc->refs[level - 1] == 0)) { |
| 8065 | btrfs_err(root->fs_info, "Missing references."); |
| 8066 | BUG(); |
| 8067 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8068 | *lookup_info = 0; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8069 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8070 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8071 | if (wc->refs[level - 1] > 1) { |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8072 | need_account = true; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8073 | if (level == 1 && |
| 8074 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 8075 | goto skip; |
| 8076 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8077 | if (!wc->update_ref || |
| 8078 | generation <= root->root_key.offset) |
| 8079 | goto skip; |
| 8080 | |
| 8081 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
| 8082 | path->slots[level]); |
| 8083 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); |
| 8084 | if (ret < 0) |
| 8085 | goto skip; |
| 8086 | |
| 8087 | wc->stage = UPDATE_BACKREF; |
| 8088 | wc->shared_level = level - 1; |
| 8089 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8090 | } else { |
| 8091 | if (level == 1 && |
| 8092 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 8093 | goto skip; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8094 | } |
| 8095 | |
Chris Mason | b9fab91 | 2012-05-06 07:23:47 -0400 | [diff] [blame] | 8096 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8097 | btrfs_tree_unlock(next); |
| 8098 | free_extent_buffer(next); |
| 8099 | next = NULL; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8100 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8101 | } |
| 8102 | |
| 8103 | if (!next) { |
| 8104 | if (reada && level == 1) |
| 8105 | reada_walk_down(trans, root, wc, path); |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 8106 | next = read_tree_block(root, bytenr, generation); |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 8107 | if (!next || !extent_buffer_uptodate(next)) { |
| 8108 | free_extent_buffer(next); |
Tsutomu Itoh | 97d9a8a | 2011-03-24 06:33:21 +0000 | [diff] [blame] | 8109 | return -EIO; |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 8110 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8111 | btrfs_tree_lock(next); |
| 8112 | btrfs_set_lock_blocking(next); |
| 8113 | } |
| 8114 | |
| 8115 | level--; |
| 8116 | BUG_ON(level != btrfs_header_level(next)); |
| 8117 | path->nodes[level] = next; |
| 8118 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8119 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8120 | wc->level = level; |
| 8121 | if (wc->level == 1) |
| 8122 | wc->reada_slot = 0; |
| 8123 | return 0; |
| 8124 | skip: |
| 8125 | wc->refs[level - 1] = 0; |
| 8126 | wc->flags[level - 1] = 0; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8127 | if (wc->stage == DROP_REFERENCE) { |
| 8128 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| 8129 | parent = path->nodes[level]->start; |
| 8130 | } else { |
| 8131 | BUG_ON(root->root_key.objectid != |
| 8132 | btrfs_header_owner(path->nodes[level])); |
| 8133 | parent = 0; |
| 8134 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8135 | |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8136 | if (need_account) { |
| 8137 | ret = account_shared_subtree(trans, root, next, |
| 8138 | generation, level - 1); |
| 8139 | if (ret) { |
| 8140 | printk_ratelimited(KERN_ERR "BTRFS: %s Error " |
| 8141 | "%d accounting shared subtree. Quota " |
| 8142 | "is out of sync, rescan required.\n", |
| 8143 | root->fs_info->sb->s_id, ret); |
| 8144 | } |
| 8145 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8146 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8147 | root->root_key.objectid, level - 1, 0, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8148 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8149 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8150 | btrfs_tree_unlock(next); |
| 8151 | free_extent_buffer(next); |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8152 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8153 | return 1; |
| 8154 | } |
| 8155 | |
| 8156 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 8157 | * helper to process tree block while walking up the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8158 | * |
| 8159 | * when wc->stage == DROP_REFERENCE, this function drops |
| 8160 | * reference count on the block. |
| 8161 | * |
| 8162 | * when wc->stage == UPDATE_BACKREF, this function changes |
| 8163 | * wc->stage back to DROP_REFERENCE if we changed wc->stage |
| 8164 | * to UPDATE_BACKREF previously while processing the block. |
| 8165 | * |
| 8166 | * NOTE: return value 1 means we should stop walking up. |
| 8167 | */ |
| 8168 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, |
| 8169 | struct btrfs_root *root, |
| 8170 | struct btrfs_path *path, |
| 8171 | struct walk_control *wc) |
| 8172 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8173 | int ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8174 | int level = wc->level; |
| 8175 | struct extent_buffer *eb = path->nodes[level]; |
| 8176 | u64 parent = 0; |
| 8177 | |
| 8178 | if (wc->stage == UPDATE_BACKREF) { |
| 8179 | BUG_ON(wc->shared_level < level); |
| 8180 | if (level < wc->shared_level) |
| 8181 | goto out; |
| 8182 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8183 | ret = find_next_key(path, level + 1, &wc->update_progress); |
| 8184 | if (ret > 0) |
| 8185 | wc->update_ref = 0; |
| 8186 | |
| 8187 | wc->stage = DROP_REFERENCE; |
| 8188 | wc->shared_level = -1; |
| 8189 | path->slots[level] = 0; |
| 8190 | |
| 8191 | /* |
| 8192 | * check reference count again if the block isn't locked. |
| 8193 | * we should start walking down the tree again if reference |
| 8194 | * count is one. |
| 8195 | */ |
| 8196 | if (!path->locks[level]) { |
| 8197 | BUG_ON(level == 0); |
| 8198 | btrfs_tree_lock(eb); |
| 8199 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8200 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8201 | |
| 8202 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 8203 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8204 | &wc->refs[level], |
| 8205 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8206 | if (ret < 0) { |
| 8207 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 8208 | path->locks[level] = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8209 | return ret; |
| 8210 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8211 | BUG_ON(wc->refs[level] == 0); |
| 8212 | if (wc->refs[level] == 1) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8213 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 8214 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8215 | return 1; |
| 8216 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8217 | } |
| 8218 | } |
| 8219 | |
| 8220 | /* wc->stage == DROP_REFERENCE */ |
| 8221 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); |
| 8222 | |
| 8223 | if (wc->refs[level] == 1) { |
| 8224 | if (level == 0) { |
| 8225 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 8226 | ret = btrfs_dec_ref(trans, root, eb, 1); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8227 | else |
Josef Bacik | e339a6b | 2014-07-02 10:54:25 -0700 | [diff] [blame] | 8228 | ret = btrfs_dec_ref(trans, root, eb, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8229 | BUG_ON(ret); /* -ENOMEM */ |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8230 | ret = account_leaf_items(trans, root, eb); |
| 8231 | if (ret) { |
| 8232 | printk_ratelimited(KERN_ERR "BTRFS: %s Error " |
| 8233 | "%d accounting leaf items. Quota " |
| 8234 | "is out of sync, rescan required.\n", |
| 8235 | root->fs_info->sb->s_id, ret); |
| 8236 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8237 | } |
| 8238 | /* make block locked assertion in clean_tree_block happy */ |
| 8239 | if (!path->locks[level] && |
| 8240 | btrfs_header_generation(eb) == trans->transid) { |
| 8241 | btrfs_tree_lock(eb); |
| 8242 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8243 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8244 | } |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 8245 | clean_tree_block(trans, root->fs_info, eb); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8246 | } |
| 8247 | |
| 8248 | if (eb == root->node) { |
| 8249 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 8250 | parent = eb->start; |
| 8251 | else |
| 8252 | BUG_ON(root->root_key.objectid != |
| 8253 | btrfs_header_owner(eb)); |
| 8254 | } else { |
| 8255 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 8256 | parent = path->nodes[level + 1]->start; |
| 8257 | else |
| 8258 | BUG_ON(root->root_key.objectid != |
| 8259 | btrfs_header_owner(path->nodes[level + 1])); |
| 8260 | } |
| 8261 | |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 8262 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8263 | out: |
| 8264 | wc->refs[level] = 0; |
| 8265 | wc->flags[level] = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8266 | return 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8267 | } |
| 8268 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8269 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
| 8270 | struct btrfs_root *root, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8271 | struct btrfs_path *path, |
| 8272 | struct walk_control *wc) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8273 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8274 | int level = wc->level; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8275 | int lookup_info = 1; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8276 | int ret; |
| 8277 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8278 | while (level >= 0) { |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8279 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8280 | if (ret > 0) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8281 | break; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8282 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8283 | if (level == 0) |
| 8284 | break; |
| 8285 | |
Yan, Zheng | 7a7965f | 2010-02-01 02:41:17 +0000 | [diff] [blame] | 8286 | if (path->slots[level] >= |
| 8287 | btrfs_header_nritems(path->nodes[level])) |
| 8288 | break; |
| 8289 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 8290 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8291 | if (ret > 0) { |
| 8292 | path->slots[level]++; |
| 8293 | continue; |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 8294 | } else if (ret < 0) |
| 8295 | return ret; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8296 | level = wc->level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8297 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8298 | return 0; |
| 8299 | } |
| 8300 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 8301 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 8302 | struct btrfs_root *root, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8303 | struct btrfs_path *path, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8304 | struct walk_control *wc, int max_level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8305 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8306 | int level = wc->level; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8307 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8308 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8309 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
| 8310 | while (level < max_level && path->nodes[level]) { |
| 8311 | wc->level = level; |
| 8312 | if (path->slots[level] + 1 < |
| 8313 | btrfs_header_nritems(path->nodes[level])) { |
| 8314 | path->slots[level]++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8315 | return 0; |
| 8316 | } else { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8317 | ret = walk_up_proc(trans, root, path, wc); |
| 8318 | if (ret > 0) |
| 8319 | return 0; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 8320 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8321 | if (path->locks[level]) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8322 | btrfs_tree_unlock_rw(path->nodes[level], |
| 8323 | path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8324 | path->locks[level] = 0; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8325 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8326 | free_extent_buffer(path->nodes[level]); |
| 8327 | path->nodes[level] = NULL; |
| 8328 | level++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8329 | } |
| 8330 | } |
| 8331 | return 1; |
| 8332 | } |
| 8333 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 8334 | /* |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8335 | * drop a subvolume tree. |
| 8336 | * |
| 8337 | * this function traverses the tree freeing any blocks that only |
| 8338 | * referenced by the tree. |
| 8339 | * |
| 8340 | * when a shared tree block is found. this function decreases its |
| 8341 | * reference count by one. if update_ref is true, this function |
| 8342 | * also make sure backrefs for the shared block and all lower level |
| 8343 | * blocks are properly updated. |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 8344 | * |
| 8345 | * If called with for_reloc == 0, may exit early with -EAGAIN |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 8346 | */ |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 8347 | int btrfs_drop_snapshot(struct btrfs_root *root, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8348 | struct btrfs_block_rsv *block_rsv, int update_ref, |
| 8349 | int for_reloc) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8350 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 8351 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8352 | struct btrfs_trans_handle *trans; |
| 8353 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8354 | struct btrfs_root_item *root_item = &root->root_item; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8355 | struct walk_control *wc; |
| 8356 | struct btrfs_key key; |
| 8357 | int err = 0; |
| 8358 | int ret; |
| 8359 | int level; |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8360 | bool root_dropped = false; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8361 | |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8362 | btrfs_debug(root->fs_info, "Drop subvolume %llu", root->objectid); |
| 8363 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 8364 | path = btrfs_alloc_path(); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8365 | if (!path) { |
| 8366 | err = -ENOMEM; |
| 8367 | goto out; |
| 8368 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8369 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8370 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 8371 | if (!wc) { |
| 8372 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8373 | err = -ENOMEM; |
| 8374 | goto out; |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 8375 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8376 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 8377 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8378 | if (IS_ERR(trans)) { |
| 8379 | err = PTR_ERR(trans); |
| 8380 | goto out_free; |
| 8381 | } |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 8382 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8383 | if (block_rsv) |
| 8384 | trans->block_rsv = block_rsv; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8385 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8386 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8387 | level = btrfs_header_level(root->node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8388 | path->nodes[level] = btrfs_lock_root_node(root); |
| 8389 | btrfs_set_lock_blocking(path->nodes[level]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8390 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8391 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8392 | memset(&wc->update_progress, 0, |
| 8393 | sizeof(wc->update_progress)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8394 | } else { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8395 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8396 | memcpy(&wc->update_progress, &key, |
| 8397 | sizeof(wc->update_progress)); |
| 8398 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 8399 | level = root_item->drop_level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8400 | BUG_ON(level == 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 8401 | path->lowest_level = level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8402 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 8403 | path->lowest_level = 0; |
| 8404 | if (ret < 0) { |
| 8405 | err = ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8406 | goto out_end_trans; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 8407 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8408 | WARN_ON(ret > 0); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8409 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 8410 | /* |
| 8411 | * unlock our path, this is safe because only this |
| 8412 | * function is allowed to delete this snapshot |
| 8413 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8414 | btrfs_unlock_up_safe(path, 0); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 8415 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8416 | level = btrfs_header_level(root->node); |
| 8417 | while (1) { |
| 8418 | btrfs_tree_lock(path->nodes[level]); |
| 8419 | btrfs_set_lock_blocking(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 8420 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8421 | |
| 8422 | ret = btrfs_lookup_extent_info(trans, root, |
| 8423 | path->nodes[level]->start, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 8424 | level, 1, &wc->refs[level], |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8425 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8426 | if (ret < 0) { |
| 8427 | err = ret; |
| 8428 | goto out_end_trans; |
| 8429 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8430 | BUG_ON(wc->refs[level] == 0); |
| 8431 | |
| 8432 | if (level == root_item->drop_level) |
| 8433 | break; |
| 8434 | |
| 8435 | btrfs_tree_unlock(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 8436 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8437 | WARN_ON(wc->refs[level] != 1); |
| 8438 | level--; |
| 8439 | } |
| 8440 | } |
| 8441 | |
| 8442 | wc->level = level; |
| 8443 | wc->shared_level = -1; |
| 8444 | wc->stage = DROP_REFERENCE; |
| 8445 | wc->update_ref = update_ref; |
| 8446 | wc->keep_locks = 0; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8447 | wc->for_reloc = for_reloc; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8448 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8449 | |
| 8450 | while (1) { |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 8451 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8452 | ret = walk_down_tree(trans, root, path, wc); |
| 8453 | if (ret < 0) { |
| 8454 | err = ret; |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 8455 | break; |
| 8456 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8457 | |
| 8458 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
| 8459 | if (ret < 0) { |
| 8460 | err = ret; |
| 8461 | break; |
| 8462 | } |
| 8463 | |
| 8464 | if (ret > 0) { |
| 8465 | BUG_ON(wc->stage != DROP_REFERENCE); |
| 8466 | break; |
| 8467 | } |
| 8468 | |
| 8469 | if (wc->stage == DROP_REFERENCE) { |
| 8470 | level = wc->level; |
| 8471 | btrfs_node_key(path->nodes[level], |
| 8472 | &root_item->drop_progress, |
| 8473 | path->slots[level]); |
| 8474 | root_item->drop_level = level; |
| 8475 | } |
| 8476 | |
| 8477 | BUG_ON(wc->level == 0); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8478 | if (btrfs_should_end_transaction(trans, tree_root) || |
| 8479 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8480 | ret = btrfs_update_root(trans, tree_root, |
| 8481 | &root->root_key, |
| 8482 | root_item); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8483 | if (ret) { |
| 8484 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8485 | err = ret; |
| 8486 | goto out_end_trans; |
| 8487 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8488 | |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8489 | /* |
| 8490 | * Qgroup update accounting is run from |
| 8491 | * delayed ref handling. This usually works |
| 8492 | * out because delayed refs are normally the |
| 8493 | * only way qgroup updates are added. However, |
| 8494 | * we may have added updates during our tree |
| 8495 | * walk so run qgroups here to make sure we |
| 8496 | * don't lose any updates. |
| 8497 | */ |
| 8498 | ret = btrfs_delayed_qgroup_accounting(trans, |
| 8499 | root->fs_info); |
| 8500 | if (ret) |
| 8501 | printk_ratelimited(KERN_ERR "BTRFS: Failure %d " |
| 8502 | "running qgroup updates " |
| 8503 | "during snapshot delete. " |
| 8504 | "Quota is out of sync, " |
| 8505 | "rescan required.\n", ret); |
| 8506 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8507 | btrfs_end_transaction_throttle(trans, tree_root); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8508 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 8509 | pr_debug("BTRFS: drop snapshot early exit\n"); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8510 | err = -EAGAIN; |
| 8511 | goto out_free; |
| 8512 | } |
| 8513 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 8514 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8515 | if (IS_ERR(trans)) { |
| 8516 | err = PTR_ERR(trans); |
| 8517 | goto out_free; |
| 8518 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8519 | if (block_rsv) |
| 8520 | trans->block_rsv = block_rsv; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 8521 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8522 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8523 | btrfs_release_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8524 | if (err) |
| 8525 | goto out_end_trans; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8526 | |
| 8527 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8528 | if (ret) { |
| 8529 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8530 | goto out_end_trans; |
| 8531 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8532 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8533 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 8534 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
| 8535 | NULL, NULL); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8536 | if (ret < 0) { |
| 8537 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8538 | err = ret; |
| 8539 | goto out_end_trans; |
| 8540 | } else if (ret > 0) { |
Josef Bacik | 84cd948 | 2010-12-08 12:24:01 -0500 | [diff] [blame] | 8541 | /* if we fail to delete the orphan item this time |
| 8542 | * around, it'll get picked up the next time. |
| 8543 | * |
| 8544 | * The most common failure here is just -ENOENT. |
| 8545 | */ |
| 8546 | btrfs_del_orphan_item(trans, tree_root, |
| 8547 | root->root_key.objectid); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8548 | } |
| 8549 | } |
| 8550 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 8551 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 8552 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8553 | } else { |
| 8554 | free_extent_buffer(root->node); |
| 8555 | free_extent_buffer(root->commit_root); |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 8556 | btrfs_put_fs_root(root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8557 | } |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8558 | root_dropped = true; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8559 | out_end_trans: |
Mark Fasheh | 1152651 | 2014-07-17 12:39:01 -0700 | [diff] [blame] | 8560 | ret = btrfs_delayed_qgroup_accounting(trans, tree_root->fs_info); |
| 8561 | if (ret) |
| 8562 | printk_ratelimited(KERN_ERR "BTRFS: Failure %d " |
| 8563 | "running qgroup updates " |
| 8564 | "during snapshot delete. " |
| 8565 | "Quota is out of sync, " |
| 8566 | "rescan required.\n", ret); |
| 8567 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8568 | btrfs_end_transaction_throttle(trans, tree_root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8569 | out_free: |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8570 | kfree(wc); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 8571 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8572 | out: |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8573 | /* |
| 8574 | * So if we need to stop dropping the snapshot for whatever reason we |
| 8575 | * need to make sure to add it back to the dead root list so that we |
| 8576 | * keep trying to do the work later. This also cleans up roots if we |
| 8577 | * don't have it in the radix (like when we recover after a power fail |
| 8578 | * or unmount) so we don't leak memory. |
| 8579 | */ |
Josef Bacik | b37b39c | 2013-07-23 16:57:15 -0400 | [diff] [blame] | 8580 | if (!for_reloc && root_dropped == false) |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8581 | btrfs_add_dead_root(root); |
Wang Shilong | 90515e7 | 2014-01-07 17:26:58 +0800 | [diff] [blame] | 8582 | if (err && err != -EAGAIN) |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8583 | btrfs_std_error(root->fs_info, err); |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 8584 | return err; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8585 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8586 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8587 | /* |
| 8588 | * drop subtree rooted at tree block 'node'. |
| 8589 | * |
| 8590 | * NOTE: this function will unlock and release tree block 'node' |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8591 | * only used by relocation code |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8592 | */ |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8593 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| 8594 | struct btrfs_root *root, |
| 8595 | struct extent_buffer *node, |
| 8596 | struct extent_buffer *parent) |
| 8597 | { |
| 8598 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8599 | struct walk_control *wc; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8600 | int level; |
| 8601 | int parent_level; |
| 8602 | int ret = 0; |
| 8603 | int wret; |
| 8604 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8605 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 8606 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8607 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 8608 | if (!path) |
| 8609 | return -ENOMEM; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8610 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8611 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 8612 | if (!wc) { |
| 8613 | btrfs_free_path(path); |
| 8614 | return -ENOMEM; |
| 8615 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8616 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 8617 | btrfs_assert_tree_locked(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8618 | parent_level = btrfs_header_level(parent); |
| 8619 | extent_buffer_get(parent); |
| 8620 | path->nodes[parent_level] = parent; |
| 8621 | path->slots[parent_level] = btrfs_header_nritems(parent); |
| 8622 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 8623 | btrfs_assert_tree_locked(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8624 | level = btrfs_header_level(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8625 | path->nodes[level] = node; |
| 8626 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8627 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8628 | |
| 8629 | wc->refs[parent_level] = 1; |
| 8630 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 8631 | wc->level = level; |
| 8632 | wc->shared_level = -1; |
| 8633 | wc->stage = DROP_REFERENCE; |
| 8634 | wc->update_ref = 0; |
| 8635 | wc->keep_locks = 1; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8636 | wc->for_reloc = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8637 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8638 | |
| 8639 | while (1) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8640 | wret = walk_down_tree(trans, root, path, wc); |
| 8641 | if (wret < 0) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8642 | ret = wret; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8643 | break; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8644 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8645 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8646 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8647 | if (wret < 0) |
| 8648 | ret = wret; |
| 8649 | if (wret != 0) |
| 8650 | break; |
| 8651 | } |
| 8652 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8653 | kfree(wc); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8654 | btrfs_free_path(path); |
| 8655 | return ret; |
| 8656 | } |
| 8657 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8658 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 8659 | { |
| 8660 | u64 num_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8661 | u64 stripped; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8662 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8663 | /* |
| 8664 | * if restripe for this chunk_type is on pick target profile and |
| 8665 | * return, otherwise do the usual balance |
| 8666 | */ |
| 8667 | stripped = get_restripe_target(root->fs_info, flags); |
| 8668 | if (stripped) |
| 8669 | return extended_to_chunk(stripped); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 8670 | |
Miao Xie | 9566997 | 2014-07-24 11:37:14 +0800 | [diff] [blame] | 8671 | num_devices = root->fs_info->fs_devices->rw_devices; |
Chris Mason | cd02dca | 2010-12-13 14:56:23 -0500 | [diff] [blame] | 8672 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8673 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8674 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8675 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 8676 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8677 | if (num_devices == 1) { |
| 8678 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 8679 | stripped = flags & ~stripped; |
| 8680 | |
| 8681 | /* turn raid0 into single device chunks */ |
| 8682 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 8683 | return stripped; |
| 8684 | |
| 8685 | /* turn mirroring into duplication */ |
| 8686 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 8687 | BTRFS_BLOCK_GROUP_RAID10)) |
| 8688 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8689 | } else { |
| 8690 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8691 | if (flags & stripped) |
| 8692 | return flags; |
| 8693 | |
| 8694 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 8695 | stripped = flags & ~stripped; |
| 8696 | |
| 8697 | /* switch duplicated blocks with raid1 */ |
| 8698 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 8699 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 8700 | |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 8701 | /* this is drive concat, leave it alone */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8702 | } |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 8703 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8704 | return flags; |
| 8705 | } |
| 8706 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8707 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8708 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8709 | struct btrfs_space_info *sinfo = cache->space_info; |
| 8710 | u64 num_bytes; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8711 | u64 min_allocable_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8712 | int ret = -ENOSPC; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8713 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 8714 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8715 | /* |
| 8716 | * We need some metadata space and system metadata space for |
| 8717 | * allocating chunks in some corner cases until we force to set |
| 8718 | * it to be readonly. |
| 8719 | */ |
| 8720 | if ((sinfo->flags & |
| 8721 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && |
| 8722 | !force) |
| 8723 | min_allocable_bytes = 1 * 1024 * 1024; |
| 8724 | else |
| 8725 | min_allocable_bytes = 0; |
| 8726 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8727 | spin_lock(&sinfo->lock); |
| 8728 | spin_lock(&cache->lock); |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 8729 | |
| 8730 | if (cache->ro) { |
| 8731 | ret = 0; |
| 8732 | goto out; |
| 8733 | } |
| 8734 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8735 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 8736 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 8737 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8738 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 8739 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
| 8740 | min_allocable_bytes <= sinfo->total_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8741 | sinfo->bytes_readonly += num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8742 | cache->ro = 1; |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 8743 | list_add_tail(&cache->ro_list, &sinfo->ro_bgs); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8744 | ret = 0; |
| 8745 | } |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 8746 | out: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8747 | spin_unlock(&cache->lock); |
| 8748 | spin_unlock(&sinfo->lock); |
| 8749 | return ret; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8750 | } |
| 8751 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8752 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
| 8753 | struct btrfs_block_group_cache *cache) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8754 | |
| 8755 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8756 | struct btrfs_trans_handle *trans; |
| 8757 | u64 alloc_flags; |
| 8758 | int ret; |
| 8759 | |
| 8760 | BUG_ON(cache->ro); |
| 8761 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 8762 | again: |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 8763 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8764 | if (IS_ERR(trans)) |
| 8765 | return PTR_ERR(trans); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8766 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 8767 | /* |
| 8768 | * we're not allowed to set block groups readonly after the dirty |
| 8769 | * block groups cache has started writing. If it already started, |
| 8770 | * back off and let this transaction commit |
| 8771 | */ |
| 8772 | mutex_lock(&root->fs_info->ro_block_group_mutex); |
| 8773 | if (trans->transaction->dirty_bg_run) { |
| 8774 | u64 transid = trans->transid; |
| 8775 | |
| 8776 | mutex_unlock(&root->fs_info->ro_block_group_mutex); |
| 8777 | btrfs_end_transaction(trans, root); |
| 8778 | |
| 8779 | ret = btrfs_wait_for_commit(root, transid); |
| 8780 | if (ret) |
| 8781 | return ret; |
| 8782 | goto again; |
| 8783 | } |
| 8784 | |
| 8785 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8786 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8787 | if (!ret) |
| 8788 | goto out; |
| 8789 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 8790 | ret = do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 8791 | CHUNK_ALLOC_FORCE); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8792 | if (ret < 0) |
| 8793 | goto out; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8794 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8795 | out: |
Shaohua Li | 2f08108 | 2015-01-09 10:40:15 -0800 | [diff] [blame] | 8796 | if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 8797 | alloc_flags = update_block_group_flags(root, cache->flags); |
| 8798 | check_system_chunk(trans, root, alloc_flags); |
| 8799 | } |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 8800 | mutex_unlock(&root->fs_info->ro_block_group_mutex); |
Shaohua Li | 2f08108 | 2015-01-09 10:40:15 -0800 | [diff] [blame] | 8801 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8802 | btrfs_end_transaction(trans, root); |
| 8803 | return ret; |
| 8804 | } |
| 8805 | |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 8806 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
| 8807 | struct btrfs_root *root, u64 type) |
| 8808 | { |
| 8809 | u64 alloc_flags = get_alloc_profile(root, type); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 8810 | return do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 8811 | CHUNK_ALLOC_FORCE); |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 8812 | } |
| 8813 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8814 | /* |
| 8815 | * helper to account the unused space of all the readonly block group in the |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 8816 | * space_info. takes mirrors into account. |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8817 | */ |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 8818 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8819 | { |
| 8820 | struct btrfs_block_group_cache *block_group; |
| 8821 | u64 free_bytes = 0; |
| 8822 | int factor; |
| 8823 | |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 8824 | /* It's df, we don't care if it's racey */ |
| 8825 | if (list_empty(&sinfo->ro_bgs)) |
| 8826 | return 0; |
| 8827 | |
| 8828 | spin_lock(&sinfo->lock); |
| 8829 | list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8830 | spin_lock(&block_group->lock); |
| 8831 | |
| 8832 | if (!block_group->ro) { |
| 8833 | spin_unlock(&block_group->lock); |
| 8834 | continue; |
| 8835 | } |
| 8836 | |
| 8837 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 8838 | BTRFS_BLOCK_GROUP_RAID10 | |
| 8839 | BTRFS_BLOCK_GROUP_DUP)) |
| 8840 | factor = 2; |
| 8841 | else |
| 8842 | factor = 1; |
| 8843 | |
| 8844 | free_bytes += (block_group->key.offset - |
| 8845 | btrfs_block_group_used(&block_group->item)) * |
| 8846 | factor; |
| 8847 | |
| 8848 | spin_unlock(&block_group->lock); |
| 8849 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8850 | spin_unlock(&sinfo->lock); |
| 8851 | |
| 8852 | return free_bytes; |
| 8853 | } |
| 8854 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 8855 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8856 | struct btrfs_block_group_cache *cache) |
| 8857 | { |
| 8858 | struct btrfs_space_info *sinfo = cache->space_info; |
| 8859 | u64 num_bytes; |
| 8860 | |
| 8861 | BUG_ON(!cache->ro); |
| 8862 | |
| 8863 | spin_lock(&sinfo->lock); |
| 8864 | spin_lock(&cache->lock); |
| 8865 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 8866 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
| 8867 | sinfo->bytes_readonly -= num_bytes; |
| 8868 | cache->ro = 0; |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 8869 | list_del_init(&cache->ro_list); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8870 | spin_unlock(&cache->lock); |
| 8871 | spin_unlock(&sinfo->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8872 | } |
| 8873 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8874 | /* |
| 8875 | * checks to see if its even possible to relocate this block group. |
| 8876 | * |
| 8877 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its |
| 8878 | * ok to go ahead and try. |
| 8879 | */ |
| 8880 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8881 | { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8882 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8883 | struct btrfs_space_info *space_info; |
| 8884 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 8885 | struct btrfs_device *device; |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8886 | struct btrfs_trans_handle *trans; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8887 | u64 min_free; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8888 | u64 dev_min = 1; |
| 8889 | u64 dev_nr = 0; |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8890 | u64 target; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8891 | int index; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8892 | int full = 0; |
| 8893 | int ret = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8894 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8895 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8896 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8897 | /* odd, couldn't find the block group, leave it alone */ |
| 8898 | if (!block_group) |
| 8899 | return -1; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8900 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8901 | min_free = btrfs_block_group_used(&block_group->item); |
| 8902 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8903 | /* no bytes used, we're good */ |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8904 | if (!min_free) |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8905 | goto out; |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8906 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8907 | space_info = block_group->space_info; |
| 8908 | spin_lock(&space_info->lock); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8909 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8910 | full = space_info->full; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8911 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8912 | /* |
| 8913 | * if this is the last block group we have in this space, we can't |
Chris Mason | 7ce618d | 2009-09-22 14:48:44 -0400 | [diff] [blame] | 8914 | * relocate it unless we're able to allocate a new chunk below. |
| 8915 | * |
| 8916 | * Otherwise, we need to make sure we have room in the space to handle |
| 8917 | * all of the extents from this block group. If we can, we're good |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8918 | */ |
Chris Mason | 7ce618d | 2009-09-22 14:48:44 -0400 | [diff] [blame] | 8919 | if ((space_info->total_bytes != block_group->key.offset) && |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8920 | (space_info->bytes_used + space_info->bytes_reserved + |
| 8921 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 8922 | min_free < space_info->total_bytes)) { |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8923 | spin_unlock(&space_info->lock); |
| 8924 | goto out; |
| 8925 | } |
| 8926 | spin_unlock(&space_info->lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8927 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8928 | /* |
| 8929 | * ok we don't have enough space, but maybe we have free space on our |
| 8930 | * devices to allocate new chunks for relocation, so loop through our |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8931 | * alloc devices and guess if we have enough space. if this block |
| 8932 | * group is going to be restriped, run checks against the target |
| 8933 | * profile instead of the current one. |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8934 | */ |
| 8935 | ret = -1; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 8936 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8937 | /* |
| 8938 | * index: |
| 8939 | * 0: raid10 |
| 8940 | * 1: raid1 |
| 8941 | * 2: dup |
| 8942 | * 3: raid0 |
| 8943 | * 4: single |
| 8944 | */ |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8945 | target = get_restripe_target(root->fs_info, block_group->flags); |
| 8946 | if (target) { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 8947 | index = __get_raid_index(extended_to_chunk(target)); |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8948 | } else { |
| 8949 | /* |
| 8950 | * this is just a balance, so if we were marked as full |
| 8951 | * we know there is no space for a new chunk |
| 8952 | */ |
| 8953 | if (full) |
| 8954 | goto out; |
| 8955 | |
| 8956 | index = get_block_group_index(block_group); |
| 8957 | } |
| 8958 | |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8959 | if (index == BTRFS_RAID_RAID10) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8960 | dev_min = 4; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8961 | /* Divide by 2 */ |
| 8962 | min_free >>= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8963 | } else if (index == BTRFS_RAID_RAID1) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8964 | dev_min = 2; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8965 | } else if (index == BTRFS_RAID_DUP) { |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8966 | /* Multiply by 2 */ |
| 8967 | min_free <<= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8968 | } else if (index == BTRFS_RAID_RAID0) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8969 | dev_min = fs_devices->rw_devices; |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 8970 | min_free = div64_u64(min_free, dev_min); |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8971 | } |
| 8972 | |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8973 | /* We need to do this so that we can look at pending chunks */ |
| 8974 | trans = btrfs_join_transaction(root); |
| 8975 | if (IS_ERR(trans)) { |
| 8976 | ret = PTR_ERR(trans); |
| 8977 | goto out; |
| 8978 | } |
| 8979 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8980 | mutex_lock(&root->fs_info->chunk_mutex); |
| 8981 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8982 | u64 dev_offset; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 8983 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8984 | /* |
| 8985 | * check to make sure we can actually find a chunk with enough |
| 8986 | * space to fit our block group in. |
| 8987 | */ |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 8988 | if (device->total_bytes > device->bytes_used + min_free && |
| 8989 | !device->is_tgtdev_for_dev_replace) { |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8990 | ret = find_free_dev_extent(trans, device, min_free, |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8991 | &dev_offset, NULL); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8992 | if (!ret) |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8993 | dev_nr++; |
| 8994 | |
| 8995 | if (dev_nr >= dev_min) |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8996 | break; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8997 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8998 | ret = -1; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8999 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 9000 | } |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9001 | mutex_unlock(&root->fs_info->chunk_mutex); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 9002 | btrfs_end_transaction(trans, root); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 9003 | out: |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9004 | btrfs_put_block_group(block_group); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 9005 | return ret; |
| 9006 | } |
| 9007 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 9008 | static int find_first_block_group(struct btrfs_root *root, |
| 9009 | struct btrfs_path *path, struct btrfs_key *key) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9010 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9011 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9012 | struct btrfs_key found_key; |
| 9013 | struct extent_buffer *leaf; |
| 9014 | int slot; |
| 9015 | |
| 9016 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 9017 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9018 | goto out; |
| 9019 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 9020 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9021 | slot = path->slots[0]; |
| 9022 | leaf = path->nodes[0]; |
| 9023 | if (slot >= btrfs_header_nritems(leaf)) { |
| 9024 | ret = btrfs_next_leaf(root, path); |
| 9025 | if (ret == 0) |
| 9026 | continue; |
| 9027 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9028 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9029 | break; |
| 9030 | } |
| 9031 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 9032 | |
| 9033 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9034 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 9035 | ret = 0; |
| 9036 | goto out; |
| 9037 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9038 | path->slots[0]++; |
| 9039 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9040 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9041 | return ret; |
| 9042 | } |
| 9043 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9044 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
| 9045 | { |
| 9046 | struct btrfs_block_group_cache *block_group; |
| 9047 | u64 last = 0; |
| 9048 | |
| 9049 | while (1) { |
| 9050 | struct inode *inode; |
| 9051 | |
| 9052 | block_group = btrfs_lookup_first_block_group(info, last); |
| 9053 | while (block_group) { |
| 9054 | spin_lock(&block_group->lock); |
| 9055 | if (block_group->iref) |
| 9056 | break; |
| 9057 | spin_unlock(&block_group->lock); |
| 9058 | block_group = next_block_group(info->tree_root, |
| 9059 | block_group); |
| 9060 | } |
| 9061 | if (!block_group) { |
| 9062 | if (last == 0) |
| 9063 | break; |
| 9064 | last = 0; |
| 9065 | continue; |
| 9066 | } |
| 9067 | |
| 9068 | inode = block_group->inode; |
| 9069 | block_group->iref = 0; |
| 9070 | block_group->inode = NULL; |
| 9071 | spin_unlock(&block_group->lock); |
| 9072 | iput(inode); |
| 9073 | last = block_group->key.objectid + block_group->key.offset; |
| 9074 | btrfs_put_block_group(block_group); |
| 9075 | } |
| 9076 | } |
| 9077 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9078 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 9079 | { |
| 9080 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 9081 | struct btrfs_space_info *space_info; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9082 | struct btrfs_caching_control *caching_ctl; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9083 | struct rb_node *n; |
| 9084 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 9085 | down_write(&info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9086 | while (!list_empty(&info->caching_block_groups)) { |
| 9087 | caching_ctl = list_entry(info->caching_block_groups.next, |
| 9088 | struct btrfs_caching_control, list); |
| 9089 | list_del(&caching_ctl->list); |
| 9090 | put_caching_control(caching_ctl); |
| 9091 | } |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 9092 | up_write(&info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9093 | |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9094 | spin_lock(&info->unused_bgs_lock); |
| 9095 | while (!list_empty(&info->unused_bgs)) { |
| 9096 | block_group = list_first_entry(&info->unused_bgs, |
| 9097 | struct btrfs_block_group_cache, |
| 9098 | bg_list); |
| 9099 | list_del_init(&block_group->bg_list); |
| 9100 | btrfs_put_block_group(block_group); |
| 9101 | } |
| 9102 | spin_unlock(&info->unused_bgs_lock); |
| 9103 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9104 | spin_lock(&info->block_group_cache_lock); |
| 9105 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { |
| 9106 | block_group = rb_entry(n, struct btrfs_block_group_cache, |
| 9107 | cache_node); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9108 | rb_erase(&block_group->cache_node, |
| 9109 | &info->block_group_cache_tree); |
Filipe Manana | 01eacb2 | 2014-12-04 18:38:30 +0000 | [diff] [blame] | 9110 | RB_CLEAR_NODE(&block_group->cache_node); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 9111 | spin_unlock(&info->block_group_cache_lock); |
| 9112 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9113 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9114 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9115 | up_write(&block_group->space_info->groups_sem); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 9116 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9117 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9118 | wait_block_group_cache_done(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9119 | |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 9120 | /* |
| 9121 | * We haven't cached this block group, which means we could |
| 9122 | * possibly have excluded extents on this block group. |
| 9123 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 9124 | if (block_group->cached == BTRFS_CACHE_NO || |
| 9125 | block_group->cached == BTRFS_CACHE_ERROR) |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 9126 | free_excluded_extents(info->extent_root, block_group); |
| 9127 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9128 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 9129 | btrfs_put_block_group(block_group); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 9130 | |
| 9131 | spin_lock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9132 | } |
| 9133 | spin_unlock(&info->block_group_cache_lock); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 9134 | |
| 9135 | /* now that all the block groups are freed, go through and |
| 9136 | * free all the space_info structs. This is only called during |
| 9137 | * the final stages of unmount, and so we know nobody is |
| 9138 | * using them. We call synchronize_rcu() once before we start, |
| 9139 | * just to be on the safe side. |
| 9140 | */ |
| 9141 | synchronize_rcu(); |
| 9142 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 9143 | release_global_block_rsv(info); |
| 9144 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 9145 | while (!list_empty(&info->space_info)) { |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9146 | int i; |
| 9147 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 9148 | space_info = list_entry(info->space_info.next, |
| 9149 | struct btrfs_space_info, |
| 9150 | list); |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 9151 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 9152 | if (WARN_ON(space_info->bytes_pinned > 0 || |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 9153 | space_info->bytes_reserved > 0 || |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 9154 | space_info->bytes_may_use > 0)) { |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 9155 | dump_space_info(space_info, 0, 0); |
| 9156 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9157 | } |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 9158 | list_del(&space_info->list); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9159 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
| 9160 | struct kobject *kobj; |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9161 | kobj = space_info->block_group_kobjs[i]; |
| 9162 | space_info->block_group_kobjs[i] = NULL; |
| 9163 | if (kobj) { |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9164 | kobject_del(kobj); |
| 9165 | kobject_put(kobj); |
| 9166 | } |
| 9167 | } |
| 9168 | kobject_del(&space_info->kobj); |
| 9169 | kobject_put(&space_info->kobj); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 9170 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9171 | return 0; |
| 9172 | } |
| 9173 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9174 | static void __link_block_group(struct btrfs_space_info *space_info, |
| 9175 | struct btrfs_block_group_cache *cache) |
| 9176 | { |
| 9177 | int index = get_block_group_index(cache); |
Jeff Mahoney | ed55b6a | 2014-03-26 14:11:26 -0400 | [diff] [blame] | 9178 | bool first = false; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9179 | |
| 9180 | down_write(&space_info->groups_sem); |
Jeff Mahoney | ed55b6a | 2014-03-26 14:11:26 -0400 | [diff] [blame] | 9181 | if (list_empty(&space_info->block_groups[index])) |
| 9182 | first = true; |
| 9183 | list_add_tail(&cache->list, &space_info->block_groups[index]); |
| 9184 | up_write(&space_info->groups_sem); |
| 9185 | |
| 9186 | if (first) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9187 | struct raid_kobject *rkobj; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9188 | int ret; |
| 9189 | |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9190 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); |
| 9191 | if (!rkobj) |
| 9192 | goto out_err; |
| 9193 | rkobj->raid_type = index; |
| 9194 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); |
| 9195 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, |
| 9196 | "%s", get_raid_name(index)); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9197 | if (ret) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9198 | kobject_put(&rkobj->kobj); |
| 9199 | goto out_err; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9200 | } |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9201 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9202 | } |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9203 | |
| 9204 | return; |
| 9205 | out_err: |
| 9206 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9207 | } |
| 9208 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9209 | static struct btrfs_block_group_cache * |
| 9210 | btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) |
| 9211 | { |
| 9212 | struct btrfs_block_group_cache *cache; |
| 9213 | |
| 9214 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
| 9215 | if (!cache) |
| 9216 | return NULL; |
| 9217 | |
| 9218 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
| 9219 | GFP_NOFS); |
| 9220 | if (!cache->free_space_ctl) { |
| 9221 | kfree(cache); |
| 9222 | return NULL; |
| 9223 | } |
| 9224 | |
| 9225 | cache->key.objectid = start; |
| 9226 | cache->key.offset = size; |
| 9227 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
| 9228 | |
| 9229 | cache->sectorsize = root->sectorsize; |
| 9230 | cache->fs_info = root->fs_info; |
| 9231 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
| 9232 | &root->fs_info->mapping_tree, |
| 9233 | start); |
| 9234 | atomic_set(&cache->count, 1); |
| 9235 | spin_lock_init(&cache->lock); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 9236 | init_rwsem(&cache->data_rwsem); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9237 | INIT_LIST_HEAD(&cache->list); |
| 9238 | INIT_LIST_HEAD(&cache->cluster_list); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9239 | INIT_LIST_HEAD(&cache->bg_list); |
Josef Bacik | 633c0aa | 2014-10-31 09:49:34 -0400 | [diff] [blame] | 9240 | INIT_LIST_HEAD(&cache->ro_list); |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 9241 | INIT_LIST_HEAD(&cache->dirty_list); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 9242 | INIT_LIST_HEAD(&cache->io_list); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9243 | btrfs_init_free_space_ctl(cache); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9244 | atomic_set(&cache->trimming, 0); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9245 | |
| 9246 | return cache; |
| 9247 | } |
| 9248 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9249 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 9250 | { |
| 9251 | struct btrfs_path *path; |
| 9252 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9253 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 9254 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9255 | struct btrfs_space_info *space_info; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9256 | struct btrfs_key key; |
| 9257 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 9258 | struct extent_buffer *leaf; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9259 | int need_clear = 0; |
| 9260 | u64 cache_gen; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 9261 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 9262 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9263 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9264 | key.offset = 0; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 9265 | key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9266 | path = btrfs_alloc_path(); |
| 9267 | if (!path) |
| 9268 | return -ENOMEM; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 9269 | path->reada = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9270 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 9271 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 9272 | if (btrfs_test_opt(root, SPACE_CACHE) && |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 9273 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9274 | need_clear = 1; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 9275 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 9276 | need_clear = 1; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9277 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 9278 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9279 | ret = find_first_block_group(root, path, &key); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9280 | if (ret > 0) |
| 9281 | break; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9282 | if (ret != 0) |
| 9283 | goto error; |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9284 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 9285 | leaf = path->nodes[0]; |
| 9286 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9287 | |
| 9288 | cache = btrfs_create_block_group_cache(root, found_key.objectid, |
| 9289 | found_key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9290 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9291 | ret = -ENOMEM; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9292 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9293 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9294 | |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 9295 | if (need_clear) { |
| 9296 | /* |
| 9297 | * When we mount with old space cache, we need to |
| 9298 | * set BTRFS_DC_CLEAR and set dirty flag. |
| 9299 | * |
| 9300 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we |
| 9301 | * truncate the old free space cache inode and |
| 9302 | * setup a new one. |
| 9303 | * b) Setting 'dirty flag' makes sure that we flush |
| 9304 | * the new space cache info onto disk. |
| 9305 | */ |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 9306 | if (btrfs_test_opt(root, SPACE_CACHE)) |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 9307 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 9308 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9309 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 9310 | read_extent_buffer(leaf, &cache->item, |
| 9311 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 9312 | sizeof(cache->item)); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9313 | cache->flags = btrfs_block_group_flags(&cache->item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9314 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9315 | key.objectid = found_key.objectid + found_key.offset; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 9316 | btrfs_release_path(path); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 9317 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9318 | /* |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 9319 | * We need to exclude the super stripes now so that the space |
| 9320 | * info has super bytes accounted for, otherwise we'll think |
| 9321 | * we have more space than we actually do. |
| 9322 | */ |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 9323 | ret = exclude_super_stripes(root, cache); |
| 9324 | if (ret) { |
| 9325 | /* |
| 9326 | * We may have excluded something, so call this just in |
| 9327 | * case. |
| 9328 | */ |
| 9329 | free_excluded_extents(root, cache); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9330 | btrfs_put_block_group(cache); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 9331 | goto error; |
| 9332 | } |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 9333 | |
| 9334 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9335 | * check for two cases, either we are full, and therefore |
| 9336 | * don't need to bother with the caching work since we won't |
| 9337 | * find any space, or we are empty, and we can just add all |
| 9338 | * the space in and be done with it. This saves us _alot_ of |
| 9339 | * time, particularly in the full case. |
| 9340 | */ |
| 9341 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9342 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9343 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9344 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9345 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9346 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9347 | cache->cached = BTRFS_CACHE_FINISHED; |
| 9348 | add_new_free_space(cache, root->fs_info, |
| 9349 | found_key.objectid, |
| 9350 | found_key.objectid + |
| 9351 | found_key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9352 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9353 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 9354 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9355 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 9356 | if (ret) { |
| 9357 | btrfs_remove_free_space_cache(cache); |
| 9358 | btrfs_put_block_group(cache); |
| 9359 | goto error; |
| 9360 | } |
| 9361 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9362 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 9363 | btrfs_block_group_used(&cache->item), |
| 9364 | &space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9365 | if (ret) { |
| 9366 | btrfs_remove_free_space_cache(cache); |
| 9367 | spin_lock(&info->block_group_cache_lock); |
| 9368 | rb_erase(&cache->cache_node, |
| 9369 | &info->block_group_cache_tree); |
Filipe Manana | 01eacb2 | 2014-12-04 18:38:30 +0000 | [diff] [blame] | 9370 | RB_CLEAR_NODE(&cache->cache_node); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9371 | spin_unlock(&info->block_group_cache_lock); |
| 9372 | btrfs_put_block_group(cache); |
| 9373 | goto error; |
| 9374 | } |
| 9375 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9376 | cache->space_info = space_info; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9377 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9378 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9379 | spin_unlock(&cache->space_info->lock); |
| 9380 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9381 | __link_block_group(space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9382 | |
Chris Mason | 75ccf47 | 2008-09-30 19:24:06 -0400 | [diff] [blame] | 9383 | set_avail_alloc_bits(root->fs_info, cache->flags); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9384 | if (btrfs_chunk_readonly(root, cache->key.objectid)) { |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 9385 | set_block_group_ro(cache, 1); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9386 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
| 9387 | spin_lock(&info->unused_bgs_lock); |
| 9388 | /* Should always be true but just in case. */ |
| 9389 | if (list_empty(&cache->bg_list)) { |
| 9390 | btrfs_get_block_group(cache); |
| 9391 | list_add_tail(&cache->bg_list, |
| 9392 | &info->unused_bgs); |
| 9393 | } |
| 9394 | spin_unlock(&info->unused_bgs_lock); |
| 9395 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9396 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9397 | |
| 9398 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { |
| 9399 | if (!(get_alloc_profile(root, space_info->flags) & |
| 9400 | (BTRFS_BLOCK_GROUP_RAID10 | |
| 9401 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 9402 | BTRFS_BLOCK_GROUP_RAID5 | |
| 9403 | BTRFS_BLOCK_GROUP_RAID6 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9404 | BTRFS_BLOCK_GROUP_DUP))) |
| 9405 | continue; |
| 9406 | /* |
| 9407 | * avoid allocating from un-mirrored block group if there are |
| 9408 | * mirrored block groups. |
| 9409 | */ |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 9410 | list_for_each_entry(cache, |
| 9411 | &space_info->block_groups[BTRFS_RAID_RAID0], |
| 9412 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 9413 | set_block_group_ro(cache, 1); |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 9414 | list_for_each_entry(cache, |
| 9415 | &space_info->block_groups[BTRFS_RAID_SINGLE], |
| 9416 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 9417 | set_block_group_ro(cache, 1); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9418 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9419 | |
| 9420 | init_global_block_rsv(info); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9421 | ret = 0; |
| 9422 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9423 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 9424 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 9425 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9426 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 9427 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
| 9428 | struct btrfs_root *root) |
| 9429 | { |
| 9430 | struct btrfs_block_group_cache *block_group, *tmp; |
| 9431 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 9432 | struct btrfs_block_group_item item; |
| 9433 | struct btrfs_key key; |
| 9434 | int ret = 0; |
| 9435 | |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9436 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) { |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 9437 | if (ret) |
Filipe Manana | c92f6be | 2014-11-26 15:28:55 +0000 | [diff] [blame] | 9438 | goto next; |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 9439 | |
| 9440 | spin_lock(&block_group->lock); |
| 9441 | memcpy(&item, &block_group->item, sizeof(item)); |
| 9442 | memcpy(&key, &block_group->key, sizeof(key)); |
| 9443 | spin_unlock(&block_group->lock); |
| 9444 | |
| 9445 | ret = btrfs_insert_item(trans, extent_root, &key, &item, |
| 9446 | sizeof(item)); |
| 9447 | if (ret) |
| 9448 | btrfs_abort_transaction(trans, extent_root, ret); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 9449 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
| 9450 | key.objectid, key.offset); |
| 9451 | if (ret) |
| 9452 | btrfs_abort_transaction(trans, extent_root, ret); |
Filipe Manana | c92f6be | 2014-11-26 15:28:55 +0000 | [diff] [blame] | 9453 | next: |
| 9454 | list_del_init(&block_group->bg_list); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 9455 | } |
| 9456 | } |
| 9457 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9458 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 9459 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 9460 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9461 | u64 size) |
| 9462 | { |
| 9463 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9464 | struct btrfs_root *extent_root; |
| 9465 | struct btrfs_block_group_cache *cache; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9466 | |
| 9467 | extent_root = root->fs_info->extent_root; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9468 | |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 9469 | btrfs_set_log_full_commit(root->fs_info, trans); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 9470 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9471 | cache = btrfs_create_block_group_cache(root, chunk_offset, size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 9472 | if (!cache) |
| 9473 | return -ENOMEM; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 9474 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9475 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9476 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9477 | btrfs_set_block_group_flags(&cache->item, type); |
| 9478 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9479 | cache->flags = type; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9480 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9481 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 9482 | ret = exclude_super_stripes(root, cache); |
| 9483 | if (ret) { |
| 9484 | /* |
| 9485 | * We may have excluded something, so call this just in |
| 9486 | * case. |
| 9487 | */ |
| 9488 | free_excluded_extents(root, cache); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 9489 | btrfs_put_block_group(cache); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 9490 | return ret; |
| 9491 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9492 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9493 | add_new_free_space(cache, root->fs_info, chunk_offset, |
| 9494 | chunk_offset + size); |
| 9495 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9496 | free_excluded_extents(root, cache); |
| 9497 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9498 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 9499 | if (ret) { |
| 9500 | btrfs_remove_free_space_cache(cache); |
| 9501 | btrfs_put_block_group(cache); |
| 9502 | return ret; |
| 9503 | } |
| 9504 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9505 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 9506 | &cache->space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9507 | if (ret) { |
| 9508 | btrfs_remove_free_space_cache(cache); |
| 9509 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 9510 | rb_erase(&cache->cache_node, |
| 9511 | &root->fs_info->block_group_cache_tree); |
Filipe Manana | 01eacb2 | 2014-12-04 18:38:30 +0000 | [diff] [blame] | 9512 | RB_CLEAR_NODE(&cache->cache_node); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 9513 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 9514 | btrfs_put_block_group(cache); |
| 9515 | return ret; |
| 9516 | } |
Li Zefan | c7c144d | 2011-12-07 10:39:22 +0800 | [diff] [blame] | 9517 | update_global_block_rsv(root->fs_info); |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9518 | |
| 9519 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9520 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9521 | spin_unlock(&cache->space_info->lock); |
| 9522 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9523 | __link_block_group(cache->space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9524 | |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9525 | list_add_tail(&cache->bg_list, &trans->new_bgs); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9526 | |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 9527 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9528 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9529 | return 0; |
| 9530 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9531 | |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9532 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 9533 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 9534 | u64 extra_flags = chunk_to_extended(flags) & |
| 9535 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9536 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 9537 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9538 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 9539 | fs_info->avail_data_alloc_bits &= ~extra_flags; |
| 9540 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 9541 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; |
| 9542 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 9543 | fs_info->avail_system_alloc_bits &= ~extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 9544 | write_sequnlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9545 | } |
| 9546 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9547 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9548 | struct btrfs_root *root, u64 group_start, |
| 9549 | struct extent_map *em) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9550 | { |
| 9551 | struct btrfs_path *path; |
| 9552 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9553 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9554 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9555 | struct btrfs_key key; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9556 | struct inode *inode; |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9557 | struct kobject *kobj = NULL; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9558 | int ret; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9559 | int index; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9560 | int factor; |
Filipe Manana | 4f69cb9 | 2014-11-26 15:28:51 +0000 | [diff] [blame] | 9561 | struct btrfs_caching_control *caching_ctl = NULL; |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9562 | bool remove_em; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9563 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9564 | root = root->fs_info->extent_root; |
| 9565 | |
| 9566 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); |
| 9567 | BUG_ON(!block_group); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9568 | BUG_ON(!block_group->ro); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9569 | |
liubo | 9f7c43c | 2011-03-07 02:13:33 +0000 | [diff] [blame] | 9570 | /* |
| 9571 | * Free the reserved super bytes from this block group before |
| 9572 | * remove it. |
| 9573 | */ |
| 9574 | free_excluded_extents(root, block_group); |
| 9575 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9576 | memcpy(&key, &block_group->key, sizeof(key)); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9577 | index = get_block_group_index(block_group); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9578 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 9579 | BTRFS_BLOCK_GROUP_RAID1 | |
| 9580 | BTRFS_BLOCK_GROUP_RAID10)) |
| 9581 | factor = 2; |
| 9582 | else |
| 9583 | factor = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9584 | |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9585 | /* make sure this block group isn't part of an allocation cluster */ |
| 9586 | cluster = &root->fs_info->data_alloc_cluster; |
| 9587 | spin_lock(&cluster->refill_lock); |
| 9588 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 9589 | spin_unlock(&cluster->refill_lock); |
| 9590 | |
| 9591 | /* |
| 9592 | * make sure this block group isn't part of a metadata |
| 9593 | * allocation cluster |
| 9594 | */ |
| 9595 | cluster = &root->fs_info->meta_alloc_cluster; |
| 9596 | spin_lock(&cluster->refill_lock); |
| 9597 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 9598 | spin_unlock(&cluster->refill_lock); |
| 9599 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9600 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 9601 | if (!path) { |
| 9602 | ret = -ENOMEM; |
| 9603 | goto out; |
| 9604 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9605 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 9606 | /* |
| 9607 | * get the inode first so any iput calls done for the io_list |
| 9608 | * aren't the final iput (no unlinks allowed now) |
| 9609 | */ |
Ilya Dryomov | 10b2f34 | 2011-10-02 13:56:53 +0300 | [diff] [blame] | 9610 | inode = lookup_free_space_inode(tree_root, block_group, path); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 9611 | |
| 9612 | mutex_lock(&trans->transaction->cache_write_mutex); |
| 9613 | /* |
| 9614 | * make sure our free spache cache IO is done before remove the |
| 9615 | * free space inode |
| 9616 | */ |
| 9617 | spin_lock(&trans->transaction->dirty_bgs_lock); |
| 9618 | if (!list_empty(&block_group->io_list)) { |
| 9619 | list_del_init(&block_group->io_list); |
| 9620 | |
| 9621 | WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); |
| 9622 | |
| 9623 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
| 9624 | btrfs_wait_cache_io(root, trans, block_group, |
| 9625 | &block_group->io_ctl, path, |
| 9626 | block_group->key.objectid); |
| 9627 | btrfs_put_block_group(block_group); |
| 9628 | spin_lock(&trans->transaction->dirty_bgs_lock); |
| 9629 | } |
| 9630 | |
| 9631 | if (!list_empty(&block_group->dirty_list)) { |
| 9632 | list_del_init(&block_group->dirty_list); |
| 9633 | btrfs_put_block_group(block_group); |
| 9634 | } |
| 9635 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
| 9636 | mutex_unlock(&trans->transaction->cache_write_mutex); |
| 9637 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9638 | if (!IS_ERR(inode)) { |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 9639 | ret = btrfs_orphan_add(trans, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 9640 | if (ret) { |
| 9641 | btrfs_add_delayed_iput(inode); |
| 9642 | goto out; |
| 9643 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9644 | clear_nlink(inode); |
| 9645 | /* One for the block groups ref */ |
| 9646 | spin_lock(&block_group->lock); |
| 9647 | if (block_group->iref) { |
| 9648 | block_group->iref = 0; |
| 9649 | block_group->inode = NULL; |
| 9650 | spin_unlock(&block_group->lock); |
| 9651 | iput(inode); |
| 9652 | } else { |
| 9653 | spin_unlock(&block_group->lock); |
| 9654 | } |
| 9655 | /* One for our lookup ref */ |
Josef Bacik | 455757c | 2011-09-19 12:26:24 -0400 | [diff] [blame] | 9656 | btrfs_add_delayed_iput(inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9657 | } |
| 9658 | |
| 9659 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 9660 | key.offset = block_group->key.objectid; |
| 9661 | key.type = 0; |
| 9662 | |
| 9663 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); |
| 9664 | if (ret < 0) |
| 9665 | goto out; |
| 9666 | if (ret > 0) |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 9667 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9668 | if (ret == 0) { |
| 9669 | ret = btrfs_del_item(trans, tree_root, path); |
| 9670 | if (ret) |
| 9671 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 9672 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9673 | } |
| 9674 | |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 9675 | spin_lock(&root->fs_info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9676 | rb_erase(&block_group->cache_node, |
| 9677 | &root->fs_info->block_group_cache_tree); |
Filipe Manana | 292cbd5 | 2014-11-26 15:28:50 +0000 | [diff] [blame] | 9678 | RB_CLEAR_NODE(&block_group->cache_node); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 9679 | |
| 9680 | if (root->fs_info->first_logical_byte == block_group->key.objectid) |
| 9681 | root->fs_info->first_logical_byte = (u64)-1; |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 9682 | spin_unlock(&root->fs_info->block_group_cache_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9683 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9684 | down_write(&block_group->space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9685 | /* |
| 9686 | * we must use list_del_init so people can check to see if they |
| 9687 | * are still on the list after taking the semaphore |
| 9688 | */ |
| 9689 | list_del_init(&block_group->list); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9690 | if (list_empty(&block_group->space_info->block_groups[index])) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9691 | kobj = block_group->space_info->block_group_kobjs[index]; |
| 9692 | block_group->space_info->block_group_kobjs[index] = NULL; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9693 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9694 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9695 | up_write(&block_group->space_info->groups_sem); |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9696 | if (kobj) { |
| 9697 | kobject_del(kobj); |
| 9698 | kobject_put(kobj); |
| 9699 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9700 | |
Filipe Manana | 4f69cb9 | 2014-11-26 15:28:51 +0000 | [diff] [blame] | 9701 | if (block_group->has_caching_ctl) |
| 9702 | caching_ctl = get_caching_control(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9703 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9704 | wait_block_group_cache_done(block_group); |
Filipe Manana | 4f69cb9 | 2014-11-26 15:28:51 +0000 | [diff] [blame] | 9705 | if (block_group->has_caching_ctl) { |
| 9706 | down_write(&root->fs_info->commit_root_sem); |
| 9707 | if (!caching_ctl) { |
| 9708 | struct btrfs_caching_control *ctl; |
| 9709 | |
| 9710 | list_for_each_entry(ctl, |
| 9711 | &root->fs_info->caching_block_groups, list) |
| 9712 | if (ctl->block_group == block_group) { |
| 9713 | caching_ctl = ctl; |
| 9714 | atomic_inc(&caching_ctl->count); |
| 9715 | break; |
| 9716 | } |
| 9717 | } |
| 9718 | if (caching_ctl) |
| 9719 | list_del_init(&caching_ctl->list); |
| 9720 | up_write(&root->fs_info->commit_root_sem); |
| 9721 | if (caching_ctl) { |
| 9722 | /* Once for the caching bgs list and once for us. */ |
| 9723 | put_caching_control(caching_ctl); |
| 9724 | put_caching_control(caching_ctl); |
| 9725 | } |
| 9726 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9727 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 9728 | spin_lock(&trans->transaction->dirty_bgs_lock); |
| 9729 | if (!list_empty(&block_group->dirty_list)) { |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 9730 | WARN_ON(1); |
| 9731 | } |
| 9732 | if (!list_empty(&block_group->io_list)) { |
| 9733 | WARN_ON(1); |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 9734 | } |
| 9735 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9736 | btrfs_remove_free_space_cache(block_group); |
| 9737 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9738 | spin_lock(&block_group->space_info->lock); |
Filipe Manana | 75c68e9 | 2015-01-16 13:24:40 +0000 | [diff] [blame] | 9739 | list_del_init(&block_group->ro_list); |
Zhao Lei | 18d018a | 2015-02-24 20:07:44 +0800 | [diff] [blame] | 9740 | |
| 9741 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 9742 | WARN_ON(block_group->space_info->total_bytes |
| 9743 | < block_group->key.offset); |
| 9744 | WARN_ON(block_group->space_info->bytes_readonly |
| 9745 | < block_group->key.offset); |
| 9746 | WARN_ON(block_group->space_info->disk_total |
| 9747 | < block_group->key.offset * factor); |
| 9748 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9749 | block_group->space_info->total_bytes -= block_group->key.offset; |
| 9750 | block_group->space_info->bytes_readonly -= block_group->key.offset; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9751 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
Zhao Lei | 18d018a | 2015-02-24 20:07:44 +0800 | [diff] [blame] | 9752 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9753 | spin_unlock(&block_group->space_info->lock); |
Chris Mason | 283bb19 | 2009-07-24 16:30:55 -0400 | [diff] [blame] | 9754 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9755 | memcpy(&key, &block_group->key, sizeof(key)); |
| 9756 | |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9757 | lock_chunks(root); |
Filipe Manana | 495e64f | 2014-12-02 18:07:30 +0000 | [diff] [blame] | 9758 | if (!list_empty(&em->list)) { |
| 9759 | /* We're in the transaction->pending_chunks list. */ |
| 9760 | free_extent_map(em); |
| 9761 | } |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9762 | spin_lock(&block_group->lock); |
| 9763 | block_group->removed = 1; |
| 9764 | /* |
| 9765 | * At this point trimming can't start on this block group, because we |
| 9766 | * removed the block group from the tree fs_info->block_group_cache_tree |
| 9767 | * so no one can't find it anymore and even if someone already got this |
| 9768 | * block group before we removed it from the rbtree, they have already |
| 9769 | * incremented block_group->trimming - if they didn't, they won't find |
| 9770 | * any free space entries because we already removed them all when we |
| 9771 | * called btrfs_remove_free_space_cache(). |
| 9772 | * |
| 9773 | * And we must not remove the extent map from the fs_info->mapping_tree |
| 9774 | * to prevent the same logical address range and physical device space |
| 9775 | * ranges from being reused for a new block group. This is because our |
| 9776 | * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is |
| 9777 | * completely transactionless, so while it is trimming a range the |
| 9778 | * currently running transaction might finish and a new one start, |
| 9779 | * allowing for new block groups to be created that can reuse the same |
| 9780 | * physical device locations unless we take this special care. |
| 9781 | */ |
| 9782 | remove_em = (atomic_read(&block_group->trimming) == 0); |
| 9783 | /* |
| 9784 | * Make sure a trimmer task always sees the em in the pinned_chunks list |
| 9785 | * if it sees block_group->removed == 1 (needs to lock block_group->lock |
| 9786 | * before checking block_group->removed). |
| 9787 | */ |
| 9788 | if (!remove_em) { |
| 9789 | /* |
| 9790 | * Our em might be in trans->transaction->pending_chunks which |
| 9791 | * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks), |
| 9792 | * and so is the fs_info->pinned_chunks list. |
| 9793 | * |
| 9794 | * So at this point we must be holding the chunk_mutex to avoid |
| 9795 | * any races with chunk allocation (more specifically at |
| 9796 | * volumes.c:contains_pending_extent()), to ensure it always |
| 9797 | * sees the em, either in the pending_chunks list or in the |
| 9798 | * pinned_chunks list. |
| 9799 | */ |
| 9800 | list_move_tail(&em->list, &root->fs_info->pinned_chunks); |
| 9801 | } |
| 9802 | spin_unlock(&block_group->lock); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9803 | |
| 9804 | if (remove_em) { |
| 9805 | struct extent_map_tree *em_tree; |
| 9806 | |
| 9807 | em_tree = &root->fs_info->mapping_tree.map_tree; |
| 9808 | write_lock(&em_tree->lock); |
Filipe Manana | 8dbcd10 | 2014-12-02 18:07:49 +0000 | [diff] [blame] | 9809 | /* |
| 9810 | * The em might be in the pending_chunks list, so make sure the |
| 9811 | * chunk mutex is locked, since remove_extent_mapping() will |
| 9812 | * delete us from that list. |
| 9813 | */ |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 9814 | remove_extent_mapping(em_tree, em); |
| 9815 | write_unlock(&em_tree->lock); |
| 9816 | /* once for the tree */ |
| 9817 | free_extent_map(em); |
| 9818 | } |
| 9819 | |
Filipe Manana | 8dbcd10 | 2014-12-02 18:07:49 +0000 | [diff] [blame] | 9820 | unlock_chunks(root); |
| 9821 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 9822 | btrfs_put_block_group(block_group); |
| 9823 | btrfs_put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9824 | |
| 9825 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 9826 | if (ret > 0) |
| 9827 | ret = -EIO; |
| 9828 | if (ret < 0) |
| 9829 | goto out; |
| 9830 | |
| 9831 | ret = btrfs_del_item(trans, root, path); |
| 9832 | out: |
| 9833 | btrfs_free_path(path); |
| 9834 | return ret; |
| 9835 | } |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 9836 | |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9837 | /* |
| 9838 | * Process the unused_bgs list and remove any that don't have any allocated |
| 9839 | * space inside of them. |
| 9840 | */ |
| 9841 | void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) |
| 9842 | { |
| 9843 | struct btrfs_block_group_cache *block_group; |
| 9844 | struct btrfs_space_info *space_info; |
| 9845 | struct btrfs_root *root = fs_info->extent_root; |
| 9846 | struct btrfs_trans_handle *trans; |
| 9847 | int ret = 0; |
| 9848 | |
| 9849 | if (!fs_info->open) |
| 9850 | return; |
| 9851 | |
| 9852 | spin_lock(&fs_info->unused_bgs_lock); |
| 9853 | while (!list_empty(&fs_info->unused_bgs)) { |
| 9854 | u64 start, end; |
| 9855 | |
| 9856 | block_group = list_first_entry(&fs_info->unused_bgs, |
| 9857 | struct btrfs_block_group_cache, |
| 9858 | bg_list); |
| 9859 | space_info = block_group->space_info; |
| 9860 | list_del_init(&block_group->bg_list); |
| 9861 | if (ret || btrfs_mixed_space_info(space_info)) { |
| 9862 | btrfs_put_block_group(block_group); |
| 9863 | continue; |
| 9864 | } |
| 9865 | spin_unlock(&fs_info->unused_bgs_lock); |
| 9866 | |
| 9867 | /* Don't want to race with allocators so take the groups_sem */ |
| 9868 | down_write(&space_info->groups_sem); |
| 9869 | spin_lock(&block_group->lock); |
| 9870 | if (block_group->reserved || |
| 9871 | btrfs_block_group_used(&block_group->item) || |
| 9872 | block_group->ro) { |
| 9873 | /* |
| 9874 | * We want to bail if we made new allocations or have |
| 9875 | * outstanding allocations in this block group. We do |
| 9876 | * the ro check in case balance is currently acting on |
| 9877 | * this block group. |
| 9878 | */ |
| 9879 | spin_unlock(&block_group->lock); |
| 9880 | up_write(&space_info->groups_sem); |
| 9881 | goto next; |
| 9882 | } |
| 9883 | spin_unlock(&block_group->lock); |
| 9884 | |
| 9885 | /* We don't want to force the issue, only flip if it's ok. */ |
| 9886 | ret = set_block_group_ro(block_group, 0); |
| 9887 | up_write(&space_info->groups_sem); |
| 9888 | if (ret < 0) { |
| 9889 | ret = 0; |
| 9890 | goto next; |
| 9891 | } |
| 9892 | |
| 9893 | /* |
| 9894 | * Want to do this before we do anything else so we can recover |
| 9895 | * properly if we fail to join the transaction. |
| 9896 | */ |
Forrest Liu | 3d84be7 | 2015-02-11 14:24:12 +0800 | [diff] [blame] | 9897 | /* 1 for btrfs_orphan_reserve_metadata() */ |
| 9898 | trans = btrfs_start_transaction(root, 1); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9899 | if (IS_ERR(trans)) { |
| 9900 | btrfs_set_block_group_rw(root, block_group); |
| 9901 | ret = PTR_ERR(trans); |
| 9902 | goto next; |
| 9903 | } |
| 9904 | |
| 9905 | /* |
| 9906 | * We could have pending pinned extents for this block group, |
| 9907 | * just delete them, we don't care about them anymore. |
| 9908 | */ |
| 9909 | start = block_group->key.objectid; |
| 9910 | end = start + block_group->key.offset - 1; |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 9911 | /* |
| 9912 | * Hold the unused_bg_unpin_mutex lock to avoid racing with |
| 9913 | * btrfs_finish_extent_commit(). If we are at transaction N, |
| 9914 | * another task might be running finish_extent_commit() for the |
| 9915 | * previous transaction N - 1, and have seen a range belonging |
| 9916 | * to the block group in freed_extents[] before we were able to |
| 9917 | * clear the whole block group range from freed_extents[]. This |
| 9918 | * means that task can lookup for the block group after we |
| 9919 | * unpinned it from freed_extents[] and removed it, leading to |
| 9920 | * a BUG_ON() at btrfs_unpin_extent_range(). |
| 9921 | */ |
| 9922 | mutex_lock(&fs_info->unused_bg_unpin_mutex); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9923 | ret = clear_extent_bits(&fs_info->freed_extents[0], start, end, |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9924 | EXTENT_DIRTY, GFP_NOFS); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9925 | if (ret) { |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 9926 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9927 | btrfs_set_block_group_rw(root, block_group); |
| 9928 | goto end_trans; |
| 9929 | } |
| 9930 | ret = clear_extent_bits(&fs_info->freed_extents[1], start, end, |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9931 | EXTENT_DIRTY, GFP_NOFS); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9932 | if (ret) { |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 9933 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9934 | btrfs_set_block_group_rw(root, block_group); |
| 9935 | goto end_trans; |
| 9936 | } |
Filipe Manana | d4b450c | 2015-01-29 19:18:25 +0000 | [diff] [blame] | 9937 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9938 | |
| 9939 | /* Reset pinned so btrfs_put_block_group doesn't complain */ |
Zhao Lei | c30666d | 2015-02-25 14:17:20 +0800 | [diff] [blame] | 9940 | spin_lock(&space_info->lock); |
| 9941 | spin_lock(&block_group->lock); |
| 9942 | |
| 9943 | space_info->bytes_pinned -= block_group->pinned; |
| 9944 | space_info->bytes_readonly += block_group->pinned; |
| 9945 | percpu_counter_add(&space_info->total_bytes_pinned, |
| 9946 | -block_group->pinned); |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9947 | block_group->pinned = 0; |
| 9948 | |
Zhao Lei | c30666d | 2015-02-25 14:17:20 +0800 | [diff] [blame] | 9949 | spin_unlock(&block_group->lock); |
| 9950 | spin_unlock(&space_info->lock); |
| 9951 | |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9952 | /* |
| 9953 | * Btrfs_remove_chunk will abort the transaction if things go |
| 9954 | * horribly wrong. |
| 9955 | */ |
| 9956 | ret = btrfs_remove_chunk(trans, root, |
| 9957 | block_group->key.objectid); |
Filipe Manana | 758eb51 | 2014-11-03 14:08:39 +0000 | [diff] [blame] | 9958 | end_trans: |
Josef Bacik | 47ab2a6 | 2014-09-18 11:20:02 -0400 | [diff] [blame] | 9959 | btrfs_end_transaction(trans, root); |
| 9960 | next: |
| 9961 | btrfs_put_block_group(block_group); |
| 9962 | spin_lock(&fs_info->unused_bgs_lock); |
| 9963 | } |
| 9964 | spin_unlock(&fs_info->unused_bgs_lock); |
| 9965 | } |
| 9966 | |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9967 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
| 9968 | { |
| 9969 | struct btrfs_space_info *space_info; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9970 | struct btrfs_super_block *disk_super; |
| 9971 | u64 features; |
| 9972 | u64 flags; |
| 9973 | int mixed = 0; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9974 | int ret; |
| 9975 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 9976 | disk_super = fs_info->super_copy; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9977 | if (!btrfs_super_root(disk_super)) |
| 9978 | return 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9979 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9980 | features = btrfs_super_incompat_flags(disk_super); |
| 9981 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) |
| 9982 | mixed = 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9983 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9984 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 9985 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9986 | if (ret) |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9987 | goto out; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9988 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9989 | if (mixed) { |
| 9990 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; |
| 9991 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 9992 | } else { |
| 9993 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 9994 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 9995 | if (ret) |
| 9996 | goto out; |
| 9997 | |
| 9998 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 9999 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 10000 | } |
| 10001 | out: |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 10002 | return ret; |
| 10003 | } |
| 10004 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 10005 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
| 10006 | { |
Filipe Manana | 678886b | 2014-12-07 21:31:47 +0000 | [diff] [blame] | 10007 | return unpin_extent_range(root, start, end, false); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 10008 | } |
| 10009 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 10010 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) |
| 10011 | { |
| 10012 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 10013 | struct btrfs_block_group_cache *cache = NULL; |
| 10014 | u64 group_trimmed; |
| 10015 | u64 start; |
| 10016 | u64 end; |
| 10017 | u64 trimmed = 0; |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 10018 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 10019 | int ret = 0; |
| 10020 | |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 10021 | /* |
| 10022 | * try to trim all FS space, our block group may start from non-zero. |
| 10023 | */ |
| 10024 | if (range->len == total_bytes) |
| 10025 | cache = btrfs_lookup_first_block_group(fs_info, range->start); |
| 10026 | else |
| 10027 | cache = btrfs_lookup_block_group(fs_info, range->start); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 10028 | |
| 10029 | while (cache) { |
| 10030 | if (cache->key.objectid >= (range->start + range->len)) { |
| 10031 | btrfs_put_block_group(cache); |
| 10032 | break; |
| 10033 | } |
| 10034 | |
| 10035 | start = max(range->start, cache->key.objectid); |
| 10036 | end = min(range->start + range->len, |
| 10037 | cache->key.objectid + cache->key.offset); |
| 10038 | |
| 10039 | if (end - start >= range->minlen) { |
| 10040 | if (!block_group_cache_done(cache)) { |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 10041 | ret = cache_block_group(cache, 0); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 10042 | if (ret) { |
| 10043 | btrfs_put_block_group(cache); |
| 10044 | break; |
| 10045 | } |
| 10046 | ret = wait_block_group_cache_done(cache); |
| 10047 | if (ret) { |
| 10048 | btrfs_put_block_group(cache); |
| 10049 | break; |
| 10050 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 10051 | } |
| 10052 | ret = btrfs_trim_block_group(cache, |
| 10053 | &group_trimmed, |
| 10054 | start, |
| 10055 | end, |
| 10056 | range->minlen); |
| 10057 | |
| 10058 | trimmed += group_trimmed; |
| 10059 | if (ret) { |
| 10060 | btrfs_put_block_group(cache); |
| 10061 | break; |
| 10062 | } |
| 10063 | } |
| 10064 | |
| 10065 | cache = next_block_group(fs_info->tree_root, cache); |
| 10066 | } |
| 10067 | |
| 10068 | range->len = trimmed; |
| 10069 | return ret; |
| 10070 | } |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10071 | |
| 10072 | /* |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 10073 | * btrfs_{start,end}_write_no_snapshoting() are similar to |
| 10074 | * mnt_{want,drop}_write(), they are used to prevent some tasks from writing |
| 10075 | * data into the page cache through nocow before the subvolume is snapshoted, |
| 10076 | * but flush the data into disk after the snapshot creation, or to prevent |
| 10077 | * operations while snapshoting is ongoing and that cause the snapshot to be |
| 10078 | * inconsistent (writes followed by expanding truncates for example). |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10079 | */ |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 10080 | void btrfs_end_write_no_snapshoting(struct btrfs_root *root) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10081 | { |
| 10082 | percpu_counter_dec(&root->subv_writers->counter); |
| 10083 | /* |
| 10084 | * Make sure counter is updated before we wake up |
| 10085 | * waiters. |
| 10086 | */ |
| 10087 | smp_mb(); |
| 10088 | if (waitqueue_active(&root->subv_writers->wait)) |
| 10089 | wake_up(&root->subv_writers->wait); |
| 10090 | } |
| 10091 | |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 10092 | int btrfs_start_write_no_snapshoting(struct btrfs_root *root) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10093 | { |
David Sterba | ee39b43 | 2014-09-30 01:33:33 +0200 | [diff] [blame] | 10094 | if (atomic_read(&root->will_be_snapshoted)) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10095 | return 0; |
| 10096 | |
| 10097 | percpu_counter_inc(&root->subv_writers->counter); |
| 10098 | /* |
| 10099 | * Make sure counter is updated before we check for snapshot creation. |
| 10100 | */ |
| 10101 | smp_mb(); |
David Sterba | ee39b43 | 2014-09-30 01:33:33 +0200 | [diff] [blame] | 10102 | if (atomic_read(&root->will_be_snapshoted)) { |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 10103 | btrfs_end_write_no_snapshoting(root); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 10104 | return 0; |
| 10105 | } |
| 10106 | return 1; |
| 10107 | } |