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 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 77 | static int update_block_group(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 78 | u64 bytenr, u64 num_bytes, int alloc); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 79 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 80 | struct btrfs_root *root, |
| 81 | u64 bytenr, u64 num_bytes, u64 parent, |
| 82 | u64 root_objectid, u64 owner_objectid, |
| 83 | u64 owner_offset, int refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 84 | struct btrfs_delayed_extent_op *extra_op, |
| 85 | int no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 86 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 87 | struct extent_buffer *leaf, |
| 88 | struct btrfs_extent_item *ei); |
| 89 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 90 | struct btrfs_root *root, |
| 91 | u64 parent, u64 root_objectid, |
| 92 | u64 flags, u64 owner, u64 offset, |
| 93 | struct btrfs_key *ins, int ref_mod); |
| 94 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 95 | struct btrfs_root *root, |
| 96 | u64 parent, u64 root_objectid, |
| 97 | u64 flags, struct btrfs_disk_key *key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 98 | int level, struct btrfs_key *ins, |
| 99 | int no_quota); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 100 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 101 | struct btrfs_root *extent_root, u64 flags, |
| 102 | int force); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 103 | static int find_next_key(struct btrfs_path *path, int level, |
| 104 | struct btrfs_key *key); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 105 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 106 | int dump_block_groups); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 107 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 108 | u64 num_bytes, int reserve, |
| 109 | int delalloc); |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 110 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 111 | u64 num_bytes); |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 112 | int btrfs_pin_extent(struct btrfs_root *root, |
| 113 | u64 bytenr, u64 num_bytes, int reserved); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 114 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 115 | static noinline int |
| 116 | block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 117 | { |
| 118 | smp_mb(); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 119 | return cache->cached == BTRFS_CACHE_FINISHED || |
| 120 | cache->cached == BTRFS_CACHE_ERROR; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 121 | } |
| 122 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 123 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 124 | { |
| 125 | return (cache->flags & bits) == bits; |
| 126 | } |
| 127 | |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 128 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 129 | { |
| 130 | atomic_inc(&cache->count); |
| 131 | } |
| 132 | |
| 133 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) |
| 134 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 135 | if (atomic_dec_and_test(&cache->count)) { |
| 136 | WARN_ON(cache->pinned > 0); |
| 137 | WARN_ON(cache->reserved > 0); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 138 | kfree(cache->free_space_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 139 | kfree(cache); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 140 | } |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 141 | } |
| 142 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 143 | /* |
| 144 | * this adds the block group to the fs_info rb tree for the block group |
| 145 | * cache |
| 146 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 147 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 148 | struct btrfs_block_group_cache *block_group) |
| 149 | { |
| 150 | struct rb_node **p; |
| 151 | struct rb_node *parent = NULL; |
| 152 | struct btrfs_block_group_cache *cache; |
| 153 | |
| 154 | spin_lock(&info->block_group_cache_lock); |
| 155 | p = &info->block_group_cache_tree.rb_node; |
| 156 | |
| 157 | while (*p) { |
| 158 | parent = *p; |
| 159 | cache = rb_entry(parent, struct btrfs_block_group_cache, |
| 160 | cache_node); |
| 161 | if (block_group->key.objectid < cache->key.objectid) { |
| 162 | p = &(*p)->rb_left; |
| 163 | } else if (block_group->key.objectid > cache->key.objectid) { |
| 164 | p = &(*p)->rb_right; |
| 165 | } else { |
| 166 | spin_unlock(&info->block_group_cache_lock); |
| 167 | return -EEXIST; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | rb_link_node(&block_group->cache_node, parent, p); |
| 172 | rb_insert_color(&block_group->cache_node, |
| 173 | &info->block_group_cache_tree); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 174 | |
| 175 | if (info->first_logical_byte > block_group->key.objectid) |
| 176 | info->first_logical_byte = block_group->key.objectid; |
| 177 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 178 | spin_unlock(&info->block_group_cache_lock); |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * This will return the block group at or after bytenr if contains is 0, else |
| 185 | * it will return the block group that contains the bytenr |
| 186 | */ |
| 187 | static struct btrfs_block_group_cache * |
| 188 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, |
| 189 | int contains) |
| 190 | { |
| 191 | struct btrfs_block_group_cache *cache, *ret = NULL; |
| 192 | struct rb_node *n; |
| 193 | u64 end, start; |
| 194 | |
| 195 | spin_lock(&info->block_group_cache_lock); |
| 196 | n = info->block_group_cache_tree.rb_node; |
| 197 | |
| 198 | while (n) { |
| 199 | cache = rb_entry(n, struct btrfs_block_group_cache, |
| 200 | cache_node); |
| 201 | end = cache->key.objectid + cache->key.offset - 1; |
| 202 | start = cache->key.objectid; |
| 203 | |
| 204 | if (bytenr < start) { |
| 205 | if (!contains && (!ret || start < ret->key.objectid)) |
| 206 | ret = cache; |
| 207 | n = n->rb_left; |
| 208 | } else if (bytenr > start) { |
| 209 | if (contains && bytenr <= end) { |
| 210 | ret = cache; |
| 211 | break; |
| 212 | } |
| 213 | n = n->rb_right; |
| 214 | } else { |
| 215 | ret = cache; |
| 216 | break; |
| 217 | } |
| 218 | } |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 219 | if (ret) { |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 220 | btrfs_get_block_group(ret); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 221 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
| 222 | info->first_logical_byte = ret->key.objectid; |
| 223 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 224 | spin_unlock(&info->block_group_cache_lock); |
| 225 | |
| 226 | return ret; |
| 227 | } |
| 228 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 229 | static int add_excluded_extent(struct btrfs_root *root, |
| 230 | u64 start, u64 num_bytes) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 231 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 232 | u64 end = start + num_bytes - 1; |
| 233 | set_extent_bits(&root->fs_info->freed_extents[0], |
| 234 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 235 | set_extent_bits(&root->fs_info->freed_extents[1], |
| 236 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 237 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 238 | } |
| 239 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 240 | static void free_excluded_extents(struct btrfs_root *root, |
| 241 | struct btrfs_block_group_cache *cache) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 242 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 243 | u64 start, end; |
| 244 | |
| 245 | start = cache->key.objectid; |
| 246 | end = start + cache->key.offset - 1; |
| 247 | |
| 248 | clear_extent_bits(&root->fs_info->freed_extents[0], |
| 249 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 250 | clear_extent_bits(&root->fs_info->freed_extents[1], |
| 251 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 252 | } |
| 253 | |
| 254 | static int exclude_super_stripes(struct btrfs_root *root, |
| 255 | struct btrfs_block_group_cache *cache) |
| 256 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 257 | u64 bytenr; |
| 258 | u64 *logical; |
| 259 | int stripe_len; |
| 260 | int i, nr, ret; |
| 261 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 262 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
| 263 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; |
| 264 | cache->bytes_super += stripe_len; |
| 265 | ret = add_excluded_extent(root, cache->key.objectid, |
| 266 | stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 267 | if (ret) |
| 268 | return ret; |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 269 | } |
| 270 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 271 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 272 | bytenr = btrfs_sb_offset(i); |
| 273 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| 274 | cache->key.objectid, bytenr, |
| 275 | 0, &logical, &nr, &stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 276 | if (ret) |
| 277 | return ret; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 278 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 279 | while (nr--) { |
Josef Bacik | 51bf5f0 | 2013-04-23 12:55:21 -0400 | [diff] [blame] | 280 | u64 start, len; |
| 281 | |
| 282 | if (logical[nr] > cache->key.objectid + |
| 283 | cache->key.offset) |
| 284 | continue; |
| 285 | |
| 286 | if (logical[nr] + stripe_len <= cache->key.objectid) |
| 287 | continue; |
| 288 | |
| 289 | start = logical[nr]; |
| 290 | if (start < cache->key.objectid) { |
| 291 | start = cache->key.objectid; |
| 292 | len = (logical[nr] + stripe_len) - start; |
| 293 | } else { |
| 294 | len = min_t(u64, stripe_len, |
| 295 | cache->key.objectid + |
| 296 | cache->key.offset - start); |
| 297 | } |
| 298 | |
| 299 | cache->bytes_super += len; |
| 300 | ret = add_excluded_extent(root, start, len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 301 | if (ret) { |
| 302 | kfree(logical); |
| 303 | return ret; |
| 304 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 305 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 306 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 307 | kfree(logical); |
| 308 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 309 | return 0; |
| 310 | } |
| 311 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 312 | static struct btrfs_caching_control * |
| 313 | get_caching_control(struct btrfs_block_group_cache *cache) |
| 314 | { |
| 315 | struct btrfs_caching_control *ctl; |
| 316 | |
| 317 | spin_lock(&cache->lock); |
| 318 | if (cache->cached != BTRFS_CACHE_STARTED) { |
| 319 | spin_unlock(&cache->lock); |
| 320 | return NULL; |
| 321 | } |
| 322 | |
Josef Bacik | dde5abe | 2010-09-16 16:17:03 -0400 | [diff] [blame] | 323 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
| 324 | if (!cache->caching_ctl) { |
| 325 | spin_unlock(&cache->lock); |
| 326 | return NULL; |
| 327 | } |
| 328 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 329 | ctl = cache->caching_ctl; |
| 330 | atomic_inc(&ctl->count); |
| 331 | spin_unlock(&cache->lock); |
| 332 | return ctl; |
| 333 | } |
| 334 | |
| 335 | static void put_caching_control(struct btrfs_caching_control *ctl) |
| 336 | { |
| 337 | if (atomic_dec_and_test(&ctl->count)) |
| 338 | kfree(ctl); |
| 339 | } |
| 340 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 341 | /* |
| 342 | * this is only called by cache_block_group, since we could have freed extents |
| 343 | * we need to check the pinned_extents for any extents that can't be used yet |
| 344 | * since their free space will be released as soon as the transaction commits. |
| 345 | */ |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 346 | 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] | 347 | struct btrfs_fs_info *info, u64 start, u64 end) |
| 348 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 349 | u64 extent_start, extent_end, size, total_added = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 350 | int ret; |
| 351 | |
| 352 | while (start < end) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 353 | ret = find_first_extent_bit(info->pinned_extents, start, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 354 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 355 | EXTENT_DIRTY | EXTENT_UPTODATE, |
| 356 | NULL); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 357 | if (ret) |
| 358 | break; |
| 359 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 360 | if (extent_start <= start) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 361 | start = extent_end + 1; |
| 362 | } else if (extent_start > start && extent_start < end) { |
| 363 | size = extent_start - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 364 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 365 | ret = btrfs_add_free_space(block_group, start, |
| 366 | size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 367 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 368 | start = extent_end + 1; |
| 369 | } else { |
| 370 | break; |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | if (start < end) { |
| 375 | size = end - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 376 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 377 | ret = btrfs_add_free_space(block_group, start, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 378 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 379 | } |
| 380 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 381 | return total_added; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 382 | } |
| 383 | |
Qu Wenruo | d458b05 | 2014-02-28 10:46:19 +0800 | [diff] [blame] | 384 | static noinline void caching_thread(struct btrfs_work *work) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 385 | { |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 386 | struct btrfs_block_group_cache *block_group; |
| 387 | struct btrfs_fs_info *fs_info; |
| 388 | struct btrfs_caching_control *caching_ctl; |
| 389 | struct btrfs_root *extent_root; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 390 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 391 | struct extent_buffer *leaf; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 392 | struct btrfs_key key; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 393 | u64 total_found = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 394 | u64 last = 0; |
| 395 | u32 nritems; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 396 | int ret = -ENOMEM; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 397 | |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 398 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
| 399 | block_group = caching_ctl->block_group; |
| 400 | fs_info = block_group->fs_info; |
| 401 | extent_root = fs_info->extent_root; |
| 402 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 403 | path = btrfs_alloc_path(); |
| 404 | if (!path) |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 405 | goto out; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 406 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 407 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 408 | |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 409 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 410 | * We don't want to deadlock with somebody trying to allocate a new |
| 411 | * extent for the extent root while also trying to search the extent |
| 412 | * root to add free space. So we skip locking and search the commit |
| 413 | * root, since its read-only |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 414 | */ |
| 415 | path->skip_locking = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 416 | path->search_commit_root = 1; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 417 | path->reada = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 418 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 419 | key.objectid = last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 420 | key.offset = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 421 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 422 | again: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 423 | mutex_lock(&caching_ctl->mutex); |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 424 | /* need to make sure the commit_root doesn't disappear */ |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 425 | down_read(&fs_info->commit_root_sem); |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 426 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 427 | next: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 428 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 429 | if (ret < 0) |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 430 | goto err; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 431 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 432 | leaf = path->nodes[0]; |
| 433 | nritems = btrfs_header_nritems(leaf); |
| 434 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 435 | while (1) { |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 436 | if (btrfs_fs_closing(fs_info) > 1) { |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 437 | last = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 438 | break; |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 439 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 440 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 441 | if (path->slots[0] < nritems) { |
| 442 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 443 | } else { |
| 444 | ret = find_next_key(path, 0, &key); |
| 445 | if (ret) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 446 | break; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 447 | |
Josef Bacik | c9ea7b2 | 2013-09-19 10:02:11 -0400 | [diff] [blame] | 448 | if (need_resched() || |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 449 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 450 | caching_ctl->progress = last; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 451 | btrfs_release_path(path); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 452 | up_read(&fs_info->commit_root_sem); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 453 | mutex_unlock(&caching_ctl->mutex); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 454 | cond_resched(); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 455 | goto again; |
| 456 | } |
Josef Bacik | 0a3896d | 2013-04-19 14:37:26 -0400 | [diff] [blame] | 457 | |
| 458 | ret = btrfs_next_leaf(extent_root, path); |
| 459 | if (ret < 0) |
| 460 | goto err; |
| 461 | if (ret) |
| 462 | break; |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 463 | leaf = path->nodes[0]; |
| 464 | nritems = btrfs_header_nritems(leaf); |
| 465 | continue; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 466 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 467 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 468 | if (key.objectid < last) { |
| 469 | key.objectid = last; |
| 470 | key.offset = 0; |
| 471 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 472 | |
| 473 | caching_ctl->progress = last; |
| 474 | btrfs_release_path(path); |
| 475 | goto next; |
| 476 | } |
| 477 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 478 | if (key.objectid < block_group->key.objectid) { |
| 479 | path->slots[0]++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 480 | continue; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 481 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 482 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 483 | if (key.objectid >= block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 484 | block_group->key.offset) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 485 | break; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 486 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 487 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
| 488 | key.type == BTRFS_METADATA_ITEM_KEY) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 489 | total_found += add_new_free_space(block_group, |
| 490 | fs_info, last, |
| 491 | key.objectid); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 492 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
| 493 | last = key.objectid + |
| 494 | fs_info->tree_root->leafsize; |
| 495 | else |
| 496 | last = key.objectid + key.offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 497 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 498 | if (total_found > (1024 * 1024 * 2)) { |
| 499 | total_found = 0; |
| 500 | wake_up(&caching_ctl->wait); |
| 501 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 502 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 503 | path->slots[0]++; |
| 504 | } |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 505 | ret = 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 506 | |
| 507 | total_found += add_new_free_space(block_group, fs_info, last, |
| 508 | block_group->key.objectid + |
| 509 | block_group->key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 510 | caching_ctl->progress = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 511 | |
| 512 | spin_lock(&block_group->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 513 | block_group->caching_ctl = NULL; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 514 | block_group->cached = BTRFS_CACHE_FINISHED; |
| 515 | spin_unlock(&block_group->lock); |
| 516 | |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 517 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 518 | btrfs_free_path(path); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 519 | up_read(&fs_info->commit_root_sem); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 520 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 521 | free_excluded_extents(extent_root, block_group); |
| 522 | |
| 523 | mutex_unlock(&caching_ctl->mutex); |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 524 | out: |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 525 | if (ret) { |
| 526 | spin_lock(&block_group->lock); |
| 527 | block_group->caching_ctl = NULL; |
| 528 | block_group->cached = BTRFS_CACHE_ERROR; |
| 529 | spin_unlock(&block_group->lock); |
| 530 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 531 | wake_up(&caching_ctl->wait); |
| 532 | |
| 533 | put_caching_control(caching_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 534 | btrfs_put_block_group(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 535 | } |
| 536 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 537 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 538 | int load_cache_only) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 539 | { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 540 | DEFINE_WAIT(wait); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 541 | struct btrfs_fs_info *fs_info = cache->fs_info; |
| 542 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 543 | int ret = 0; |
| 544 | |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 545 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 546 | if (!caching_ctl) |
| 547 | return -ENOMEM; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 548 | |
| 549 | INIT_LIST_HEAD(&caching_ctl->list); |
| 550 | mutex_init(&caching_ctl->mutex); |
| 551 | init_waitqueue_head(&caching_ctl->wait); |
| 552 | caching_ctl->block_group = cache; |
| 553 | caching_ctl->progress = cache->key.objectid; |
| 554 | atomic_set(&caching_ctl->count, 1); |
Qu Wenruo | e66f0bb | 2014-02-28 10:46:12 +0800 | [diff] [blame] | 555 | btrfs_init_work(&caching_ctl->work, caching_thread, NULL, NULL); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 556 | |
| 557 | spin_lock(&cache->lock); |
| 558 | /* |
| 559 | * This should be a rare occasion, but this could happen I think in the |
| 560 | * case where one thread starts to load the space cache info, and then |
| 561 | * some other thread starts a transaction commit which tries to do an |
| 562 | * allocation while the other thread is still loading the space cache |
| 563 | * info. The previous loop should have kept us from choosing this block |
| 564 | * group, but if we've moved to the state where we will wait on caching |
| 565 | * block groups we need to first check if we're doing a fast load here, |
| 566 | * so we can wait for it to finish, otherwise we could end up allocating |
| 567 | * from a block group who's cache gets evicted for one reason or |
| 568 | * another. |
| 569 | */ |
| 570 | while (cache->cached == BTRFS_CACHE_FAST) { |
| 571 | struct btrfs_caching_control *ctl; |
| 572 | |
| 573 | ctl = cache->caching_ctl; |
| 574 | atomic_inc(&ctl->count); |
| 575 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); |
| 576 | spin_unlock(&cache->lock); |
| 577 | |
| 578 | schedule(); |
| 579 | |
| 580 | finish_wait(&ctl->wait, &wait); |
| 581 | put_caching_control(ctl); |
| 582 | spin_lock(&cache->lock); |
| 583 | } |
| 584 | |
| 585 | if (cache->cached != BTRFS_CACHE_NO) { |
| 586 | spin_unlock(&cache->lock); |
| 587 | kfree(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 588 | return 0; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 589 | } |
| 590 | WARN_ON(cache->caching_ctl); |
| 591 | cache->caching_ctl = caching_ctl; |
| 592 | cache->cached = BTRFS_CACHE_FAST; |
| 593 | spin_unlock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 594 | |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 595 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 596 | ret = load_free_space_cache(fs_info, cache); |
| 597 | |
| 598 | spin_lock(&cache->lock); |
| 599 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 600 | cache->caching_ctl = NULL; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 601 | cache->cached = BTRFS_CACHE_FINISHED; |
| 602 | cache->last_byte_to_unpin = (u64)-1; |
| 603 | } else { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 604 | if (load_cache_only) { |
| 605 | cache->caching_ctl = NULL; |
| 606 | cache->cached = BTRFS_CACHE_NO; |
| 607 | } else { |
| 608 | cache->cached = BTRFS_CACHE_STARTED; |
| 609 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 610 | } |
| 611 | spin_unlock(&cache->lock); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 612 | wake_up(&caching_ctl->wait); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 613 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 614 | put_caching_control(caching_ctl); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 615 | free_excluded_extents(fs_info->extent_root, cache); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 616 | return 0; |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 617 | } |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 618 | } else { |
| 619 | /* |
| 620 | * We are not going to do the fast caching, set cached to the |
| 621 | * appropriate value and wakeup any waiters. |
| 622 | */ |
| 623 | spin_lock(&cache->lock); |
| 624 | if (load_cache_only) { |
| 625 | cache->caching_ctl = NULL; |
| 626 | cache->cached = BTRFS_CACHE_NO; |
| 627 | } else { |
| 628 | cache->cached = BTRFS_CACHE_STARTED; |
| 629 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 630 | spin_unlock(&cache->lock); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 631 | wake_up(&caching_ctl->wait); |
| 632 | } |
| 633 | |
| 634 | if (load_cache_only) { |
| 635 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 636 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 637 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 638 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 639 | down_write(&fs_info->commit_root_sem); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 640 | atomic_inc(&caching_ctl->count); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 641 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 642 | up_write(&fs_info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 643 | |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 644 | btrfs_get_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 645 | |
Qu Wenruo | e66f0bb | 2014-02-28 10:46:12 +0800 | [diff] [blame] | 646 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 647 | |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 648 | return ret; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 649 | } |
| 650 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 651 | /* |
| 652 | * return the block group that starts at or after bytenr |
| 653 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 654 | static struct btrfs_block_group_cache * |
| 655 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 656 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 657 | struct btrfs_block_group_cache *cache; |
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 | cache = block_group_cache_tree_search(info, bytenr, 0); |
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 | return cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 662 | } |
| 663 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 664 | /* |
Sankar P | 9f55684 | 2009-05-14 13:52:22 -0400 | [diff] [blame] | 665 | * return the block group that contains the given bytenr |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 666 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 667 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| 668 | struct btrfs_fs_info *info, |
| 669 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 670 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 671 | struct btrfs_block_group_cache *cache; |
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 | cache = block_group_cache_tree_search(info, bytenr, 1); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 674 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 675 | return cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 676 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 677 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 678 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 679 | u64 flags) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 680 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 681 | struct list_head *head = &info->space_info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 682 | struct btrfs_space_info *found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 683 | |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 684 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 685 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 686 | rcu_read_lock(); |
| 687 | list_for_each_entry_rcu(found, head, list) { |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 688 | if (found->flags & flags) { |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 689 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 690 | return found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 691 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 692 | } |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 693 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 694 | return NULL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 695 | } |
| 696 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 697 | /* |
| 698 | * after adding space to the filesystem, we need to clear the full flags |
| 699 | * on all the space infos. |
| 700 | */ |
| 701 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) |
| 702 | { |
| 703 | struct list_head *head = &info->space_info; |
| 704 | struct btrfs_space_info *found; |
| 705 | |
| 706 | rcu_read_lock(); |
| 707 | list_for_each_entry_rcu(found, head, list) |
| 708 | found->full = 0; |
| 709 | rcu_read_unlock(); |
| 710 | } |
| 711 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 712 | /* simple helper to search for an existing extent at a given offset */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 713 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 714 | { |
| 715 | int ret; |
| 716 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 717 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 718 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 719 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 720 | if (!path) |
| 721 | return -ENOMEM; |
| 722 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 723 | key.objectid = start; |
| 724 | key.offset = len; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 725 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 726 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
| 727 | 0, 0); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 728 | if (ret > 0) { |
| 729 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 730 | if (key.objectid == start && |
| 731 | key.type == BTRFS_METADATA_ITEM_KEY) |
| 732 | ret = 0; |
| 733 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 734 | btrfs_free_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 735 | return ret; |
| 736 | } |
| 737 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 738 | /* |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 739 | * helper function to lookup reference count and flags of a tree block. |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 740 | * |
| 741 | * the head node for delayed ref is used to store the sum of all the |
| 742 | * reference count modifications queued up in the rbtree. the head |
| 743 | * node may also store the extent flags to set. This way you can check |
| 744 | * to see what the reference count and extent flags would be if all of |
| 745 | * the delayed refs are not processed. |
| 746 | */ |
| 747 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, |
| 748 | struct btrfs_root *root, u64 bytenr, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 749 | u64 offset, int metadata, u64 *refs, u64 *flags) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 750 | { |
| 751 | struct btrfs_delayed_ref_head *head; |
| 752 | struct btrfs_delayed_ref_root *delayed_refs; |
| 753 | struct btrfs_path *path; |
| 754 | struct btrfs_extent_item *ei; |
| 755 | struct extent_buffer *leaf; |
| 756 | struct btrfs_key key; |
| 757 | u32 item_size; |
| 758 | u64 num_refs; |
| 759 | u64 extent_flags; |
| 760 | int ret; |
| 761 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 762 | /* |
| 763 | * If we don't have skinny metadata, don't bother doing anything |
| 764 | * different |
| 765 | */ |
| 766 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { |
| 767 | offset = root->leafsize; |
| 768 | metadata = 0; |
| 769 | } |
| 770 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 771 | path = btrfs_alloc_path(); |
| 772 | if (!path) |
| 773 | return -ENOMEM; |
| 774 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 775 | if (!trans) { |
| 776 | path->skip_locking = 1; |
| 777 | path->search_commit_root = 1; |
| 778 | } |
Filipe David Borba Manana | 639eefc | 2013-12-08 00:26:29 +0000 | [diff] [blame] | 779 | |
| 780 | search_again: |
| 781 | key.objectid = bytenr; |
| 782 | key.offset = offset; |
| 783 | if (metadata) |
| 784 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 785 | else |
| 786 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 787 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 788 | again: |
| 789 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, |
| 790 | &key, path, 0, 0); |
| 791 | if (ret < 0) |
| 792 | goto out_free; |
| 793 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 794 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
Filipe David Borba Manana | 74be951 | 2013-07-05 23:12:06 +0100 | [diff] [blame] | 795 | if (path->slots[0]) { |
| 796 | path->slots[0]--; |
| 797 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 798 | path->slots[0]); |
| 799 | if (key.objectid == bytenr && |
| 800 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 801 | key.offset == root->leafsize) |
| 802 | ret = 0; |
| 803 | } |
| 804 | if (ret) { |
| 805 | key.objectid = bytenr; |
| 806 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 807 | key.offset = root->leafsize; |
| 808 | btrfs_release_path(path); |
| 809 | goto again; |
| 810 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 811 | } |
| 812 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 813 | if (ret == 0) { |
| 814 | leaf = path->nodes[0]; |
| 815 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 816 | if (item_size >= sizeof(*ei)) { |
| 817 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 818 | struct btrfs_extent_item); |
| 819 | num_refs = btrfs_extent_refs(leaf, ei); |
| 820 | extent_flags = btrfs_extent_flags(leaf, ei); |
| 821 | } else { |
| 822 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 823 | struct btrfs_extent_item_v0 *ei0; |
| 824 | BUG_ON(item_size != sizeof(*ei0)); |
| 825 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 826 | struct btrfs_extent_item_v0); |
| 827 | num_refs = btrfs_extent_refs_v0(leaf, ei0); |
| 828 | /* FIXME: this isn't correct for data */ |
| 829 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 830 | #else |
| 831 | BUG(); |
| 832 | #endif |
| 833 | } |
| 834 | BUG_ON(num_refs == 0); |
| 835 | } else { |
| 836 | num_refs = 0; |
| 837 | extent_flags = 0; |
| 838 | ret = 0; |
| 839 | } |
| 840 | |
| 841 | if (!trans) |
| 842 | goto out; |
| 843 | |
| 844 | delayed_refs = &trans->transaction->delayed_refs; |
| 845 | spin_lock(&delayed_refs->lock); |
| 846 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 847 | if (head) { |
| 848 | if (!mutex_trylock(&head->mutex)) { |
| 849 | atomic_inc(&head->node.refs); |
| 850 | spin_unlock(&delayed_refs->lock); |
| 851 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 852 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 853 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 854 | /* |
| 855 | * Mutex was contended, block until it's released and try |
| 856 | * again |
| 857 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 858 | mutex_lock(&head->mutex); |
| 859 | mutex_unlock(&head->mutex); |
| 860 | btrfs_put_delayed_ref(&head->node); |
Filipe David Borba Manana | 639eefc | 2013-12-08 00:26:29 +0000 | [diff] [blame] | 861 | goto search_again; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 862 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 863 | spin_lock(&head->lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 864 | if (head->extent_op && head->extent_op->update_flags) |
| 865 | extent_flags |= head->extent_op->flags_to_set; |
| 866 | else |
| 867 | BUG_ON(num_refs == 0); |
| 868 | |
| 869 | num_refs += head->node.ref_mod; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 870 | spin_unlock(&head->lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 871 | mutex_unlock(&head->mutex); |
| 872 | } |
| 873 | spin_unlock(&delayed_refs->lock); |
| 874 | out: |
| 875 | WARN_ON(num_refs == 0); |
| 876 | if (refs) |
| 877 | *refs = num_refs; |
| 878 | if (flags) |
| 879 | *flags = extent_flags; |
| 880 | out_free: |
| 881 | btrfs_free_path(path); |
| 882 | return ret; |
| 883 | } |
| 884 | |
| 885 | /* |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 886 | * Back reference rules. Back refs have three main goals: |
| 887 | * |
| 888 | * 1) differentiate between all holders of references to an extent so that |
| 889 | * when a reference is dropped we can make sure it was a valid reference |
| 890 | * before freeing the extent. |
| 891 | * |
| 892 | * 2) Provide enough information to quickly find the holders of an extent |
| 893 | * if we notice a given block is corrupted or bad. |
| 894 | * |
| 895 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 896 | * maintenance. This is actually the same as #2, but with a slightly |
| 897 | * different use case. |
| 898 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 899 | * There are two kinds of back refs. The implicit back refs is optimized |
| 900 | * for pointers in non-shared tree blocks. For a given pointer in a block, |
| 901 | * back refs of this kind provide information about the block's owner tree |
| 902 | * and the pointer's key. These information allow us to find the block by |
| 903 | * b-tree searching. The full back refs is for pointers in tree blocks not |
| 904 | * referenced by their owner trees. The location of tree block is recorded |
| 905 | * in the back refs. Actually the full back refs is generic, and can be |
| 906 | * used in all cases the implicit back refs is used. The major shortcoming |
| 907 | * of the full back refs is its overhead. Every time a tree block gets |
| 908 | * COWed, we have to update back refs entry for all pointers in it. |
| 909 | * |
| 910 | * For a newly allocated tree block, we use implicit back refs for |
| 911 | * pointers in it. This means most tree related operations only involve |
| 912 | * implicit back refs. For a tree block created in old transaction, the |
| 913 | * only way to drop a reference to it is COW it. So we can detect the |
| 914 | * event that tree block loses its owner tree's reference and do the |
| 915 | * back refs conversion. |
| 916 | * |
| 917 | * When a tree block is COW'd through a tree, there are four cases: |
| 918 | * |
| 919 | * The reference count of the block is one and the tree is the block's |
| 920 | * owner tree. Nothing to do in this case. |
| 921 | * |
| 922 | * The reference count of the block is one and the tree is not the |
| 923 | * block's owner tree. In this case, full back refs is used for pointers |
| 924 | * in the block. Remove these full back refs, add implicit back refs for |
| 925 | * every pointers in the new block. |
| 926 | * |
| 927 | * The reference count of the block is greater than one and the tree is |
| 928 | * the block's owner tree. In this case, implicit back refs is used for |
| 929 | * pointers in the block. Add full back refs for every pointers in the |
| 930 | * block, increase lower level extents' reference counts. The original |
| 931 | * implicit back refs are entailed to the new block. |
| 932 | * |
| 933 | * The reference count of the block is greater than one and the tree is |
| 934 | * not the block's owner tree. Add implicit back refs for every pointer in |
| 935 | * the new block, increase lower level extents' reference count. |
| 936 | * |
| 937 | * Back Reference Key composing: |
| 938 | * |
| 939 | * The key objectid corresponds to the first byte in the extent, |
| 940 | * The key type is used to differentiate between types of back refs. |
| 941 | * There are different meanings of the key offset for different types |
| 942 | * of back refs. |
| 943 | * |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 944 | * File extents can be referenced by: |
| 945 | * |
| 946 | * - multiple snapshots, subvolumes, or different generations in one subvol |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 947 | * - different files inside a single subvolume |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 948 | * - different offsets inside a file (bookend extents in file.c) |
| 949 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 950 | * The extent ref structure for the implicit back refs has fields for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 951 | * |
| 952 | * - Objectid of the subvolume root |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 953 | * - objectid of the file holding the reference |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 954 | * - original offset in the file |
| 955 | * - how many bookend extents |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 956 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 957 | * The key offset for the implicit back refs is hash of the first |
| 958 | * three fields. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 959 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 960 | * The extent ref structure for the full back refs has field for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 961 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 962 | * - number of pointers in the tree leaf |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 963 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 964 | * The key offset for the implicit back refs is the first byte of |
| 965 | * the tree leaf |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 966 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 967 | * When a file extent is allocated, The implicit back refs is used. |
| 968 | * the fields are filled in: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 969 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 970 | * (root_key.objectid, inode objectid, offset in file, 1) |
| 971 | * |
| 972 | * When a file extent is removed file truncation, we find the |
| 973 | * corresponding implicit back refs and check the following fields: |
| 974 | * |
| 975 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 976 | * |
| 977 | * Btree extents can be referenced by: |
| 978 | * |
| 979 | * - Different subvolumes |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 980 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 981 | * Both the implicit back refs and the full back refs for tree blocks |
| 982 | * only consist of key. The key offset for the implicit back refs is |
| 983 | * objectid of block's owner tree. The key offset for the full back refs |
| 984 | * is the first byte of parent block. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 985 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 986 | * When implicit back refs is used, information about the lowest key and |
| 987 | * level of the tree block are required. These information are stored in |
| 988 | * tree block info structure. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 989 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 990 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 991 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 992 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, |
| 993 | struct btrfs_root *root, |
| 994 | struct btrfs_path *path, |
| 995 | u64 owner, u32 extra_size) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 996 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 997 | struct btrfs_extent_item *item; |
| 998 | struct btrfs_extent_item_v0 *ei0; |
| 999 | struct btrfs_extent_ref_v0 *ref0; |
| 1000 | struct btrfs_tree_block_info *bi; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1001 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1002 | struct btrfs_key key; |
| 1003 | struct btrfs_key found_key; |
| 1004 | u32 new_size = sizeof(*item); |
| 1005 | u64 refs; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1006 | int ret; |
| 1007 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1008 | leaf = path->nodes[0]; |
| 1009 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1010 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1011 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1012 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1013 | struct btrfs_extent_item_v0); |
| 1014 | refs = btrfs_extent_refs_v0(leaf, ei0); |
| 1015 | |
| 1016 | if (owner == (u64)-1) { |
| 1017 | while (1) { |
| 1018 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1019 | ret = btrfs_next_leaf(root, path); |
| 1020 | if (ret < 0) |
| 1021 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1022 | BUG_ON(ret > 0); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1023 | leaf = path->nodes[0]; |
| 1024 | } |
| 1025 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 1026 | path->slots[0]); |
| 1027 | BUG_ON(key.objectid != found_key.objectid); |
| 1028 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { |
| 1029 | path->slots[0]++; |
| 1030 | continue; |
| 1031 | } |
| 1032 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1033 | struct btrfs_extent_ref_v0); |
| 1034 | owner = btrfs_ref_objectid_v0(leaf, ref0); |
| 1035 | break; |
| 1036 | } |
| 1037 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1038 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1039 | |
| 1040 | if (owner < BTRFS_FIRST_FREE_OBJECTID) |
| 1041 | new_size += sizeof(*bi); |
| 1042 | |
| 1043 | new_size -= sizeof(*ei0); |
| 1044 | ret = btrfs_search_slot(trans, root, &key, path, |
| 1045 | new_size + extra_size, 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1046 | if (ret < 0) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1047 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1048 | BUG_ON(ret); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1049 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1050 | btrfs_extend_item(root, path, new_size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1051 | |
| 1052 | leaf = path->nodes[0]; |
| 1053 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1054 | btrfs_set_extent_refs(leaf, item, refs); |
| 1055 | /* FIXME: get real generation */ |
| 1056 | btrfs_set_extent_generation(leaf, item, 0); |
| 1057 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1058 | btrfs_set_extent_flags(leaf, item, |
| 1059 | BTRFS_EXTENT_FLAG_TREE_BLOCK | |
| 1060 | BTRFS_BLOCK_FLAG_FULL_BACKREF); |
| 1061 | bi = (struct btrfs_tree_block_info *)(item + 1); |
| 1062 | /* FIXME: get first key of the block */ |
| 1063 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); |
| 1064 | btrfs_set_tree_block_level(leaf, bi, (int)owner); |
| 1065 | } else { |
| 1066 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); |
| 1067 | } |
| 1068 | btrfs_mark_buffer_dirty(leaf); |
| 1069 | return 0; |
| 1070 | } |
| 1071 | #endif |
| 1072 | |
| 1073 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) |
| 1074 | { |
| 1075 | u32 high_crc = ~(u32)0; |
| 1076 | u32 low_crc = ~(u32)0; |
| 1077 | __le64 lenum; |
| 1078 | |
| 1079 | lenum = cpu_to_le64(root_objectid); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1080 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1081 | lenum = cpu_to_le64(owner); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1082 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1083 | lenum = cpu_to_le64(offset); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 1084 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1085 | |
| 1086 | return ((u64)high_crc << 31) ^ (u64)low_crc; |
| 1087 | } |
| 1088 | |
| 1089 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, |
| 1090 | struct btrfs_extent_data_ref *ref) |
| 1091 | { |
| 1092 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), |
| 1093 | btrfs_extent_data_ref_objectid(leaf, ref), |
| 1094 | btrfs_extent_data_ref_offset(leaf, ref)); |
| 1095 | } |
| 1096 | |
| 1097 | static int match_extent_data_ref(struct extent_buffer *leaf, |
| 1098 | struct btrfs_extent_data_ref *ref, |
| 1099 | u64 root_objectid, u64 owner, u64 offset) |
| 1100 | { |
| 1101 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || |
| 1102 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || |
| 1103 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 1104 | return 0; |
| 1105 | return 1; |
| 1106 | } |
| 1107 | |
| 1108 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1109 | struct btrfs_root *root, |
| 1110 | struct btrfs_path *path, |
| 1111 | u64 bytenr, u64 parent, |
| 1112 | u64 root_objectid, |
| 1113 | u64 owner, u64 offset) |
| 1114 | { |
| 1115 | struct btrfs_key key; |
| 1116 | struct btrfs_extent_data_ref *ref; |
| 1117 | struct extent_buffer *leaf; |
| 1118 | u32 nritems; |
| 1119 | int ret; |
| 1120 | int recow; |
| 1121 | int err = -ENOENT; |
| 1122 | |
| 1123 | key.objectid = bytenr; |
| 1124 | if (parent) { |
| 1125 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1126 | key.offset = parent; |
| 1127 | } else { |
| 1128 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1129 | key.offset = hash_extent_data_ref(root_objectid, |
| 1130 | owner, offset); |
| 1131 | } |
| 1132 | again: |
| 1133 | recow = 0; |
| 1134 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1135 | if (ret < 0) { |
| 1136 | err = ret; |
| 1137 | goto fail; |
| 1138 | } |
| 1139 | |
| 1140 | if (parent) { |
| 1141 | if (!ret) |
| 1142 | return 0; |
| 1143 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1144 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1145 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1146 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1147 | if (ret < 0) { |
| 1148 | err = ret; |
| 1149 | goto fail; |
| 1150 | } |
| 1151 | if (!ret) |
| 1152 | return 0; |
| 1153 | #endif |
| 1154 | goto fail; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1158 | nritems = btrfs_header_nritems(leaf); |
| 1159 | while (1) { |
| 1160 | if (path->slots[0] >= nritems) { |
| 1161 | ret = btrfs_next_leaf(root, path); |
| 1162 | if (ret < 0) |
| 1163 | err = ret; |
| 1164 | if (ret) |
| 1165 | goto fail; |
| 1166 | |
| 1167 | leaf = path->nodes[0]; |
| 1168 | nritems = btrfs_header_nritems(leaf); |
| 1169 | recow = 1; |
| 1170 | } |
| 1171 | |
| 1172 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1173 | if (key.objectid != bytenr || |
| 1174 | key.type != BTRFS_EXTENT_DATA_REF_KEY) |
| 1175 | goto fail; |
| 1176 | |
| 1177 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1178 | struct btrfs_extent_data_ref); |
| 1179 | |
| 1180 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1181 | owner, offset)) { |
| 1182 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1183 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1184 | goto again; |
| 1185 | } |
| 1186 | err = 0; |
| 1187 | break; |
| 1188 | } |
| 1189 | path->slots[0]++; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1190 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1191 | fail: |
| 1192 | return err; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1193 | } |
| 1194 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1195 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1196 | struct btrfs_root *root, |
| 1197 | struct btrfs_path *path, |
| 1198 | u64 bytenr, u64 parent, |
| 1199 | u64 root_objectid, u64 owner, |
| 1200 | u64 offset, int refs_to_add) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1201 | { |
| 1202 | struct btrfs_key key; |
| 1203 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1204 | u32 size; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1205 | u32 num_refs; |
| 1206 | int ret; |
| 1207 | |
| 1208 | key.objectid = bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1209 | if (parent) { |
| 1210 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1211 | key.offset = parent; |
| 1212 | size = sizeof(struct btrfs_shared_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1213 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1214 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1215 | key.offset = hash_extent_data_ref(root_objectid, |
| 1216 | owner, offset); |
| 1217 | size = sizeof(struct btrfs_extent_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1218 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1219 | |
| 1220 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
| 1221 | if (ret && ret != -EEXIST) |
| 1222 | goto fail; |
| 1223 | |
| 1224 | leaf = path->nodes[0]; |
| 1225 | if (parent) { |
| 1226 | struct btrfs_shared_data_ref *ref; |
| 1227 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1228 | struct btrfs_shared_data_ref); |
| 1229 | if (ret == 0) { |
| 1230 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); |
| 1231 | } else { |
| 1232 | num_refs = btrfs_shared_data_ref_count(leaf, ref); |
| 1233 | num_refs += refs_to_add; |
| 1234 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); |
| 1235 | } |
| 1236 | } else { |
| 1237 | struct btrfs_extent_data_ref *ref; |
| 1238 | while (ret == -EEXIST) { |
| 1239 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1240 | struct btrfs_extent_data_ref); |
| 1241 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1242 | owner, offset)) |
| 1243 | break; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1244 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1245 | key.offset++; |
| 1246 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 1247 | size); |
| 1248 | if (ret && ret != -EEXIST) |
| 1249 | goto fail; |
| 1250 | |
| 1251 | leaf = path->nodes[0]; |
| 1252 | } |
| 1253 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1254 | struct btrfs_extent_data_ref); |
| 1255 | if (ret == 0) { |
| 1256 | btrfs_set_extent_data_ref_root(leaf, ref, |
| 1257 | root_objectid); |
| 1258 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 1259 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 1260 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); |
| 1261 | } else { |
| 1262 | num_refs = btrfs_extent_data_ref_count(leaf, ref); |
| 1263 | num_refs += refs_to_add; |
| 1264 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); |
| 1265 | } |
| 1266 | } |
| 1267 | btrfs_mark_buffer_dirty(leaf); |
| 1268 | ret = 0; |
| 1269 | fail: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1270 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1271 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1272 | } |
| 1273 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1274 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1275 | struct btrfs_root *root, |
| 1276 | struct btrfs_path *path, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1277 | int refs_to_drop, int *last_ref) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1278 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1279 | struct btrfs_key key; |
| 1280 | struct btrfs_extent_data_ref *ref1 = NULL; |
| 1281 | struct btrfs_shared_data_ref *ref2 = NULL; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1282 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1283 | u32 num_refs = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1284 | int ret = 0; |
| 1285 | |
| 1286 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1287 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1288 | |
| 1289 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1290 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1291 | struct btrfs_extent_data_ref); |
| 1292 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1293 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1294 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1295 | struct btrfs_shared_data_ref); |
| 1296 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1297 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1298 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1299 | struct btrfs_extent_ref_v0 *ref0; |
| 1300 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1301 | struct btrfs_extent_ref_v0); |
| 1302 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1303 | #endif |
| 1304 | } else { |
| 1305 | BUG(); |
| 1306 | } |
| 1307 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1308 | BUG_ON(num_refs < refs_to_drop); |
| 1309 | num_refs -= refs_to_drop; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1310 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1311 | if (num_refs == 0) { |
| 1312 | ret = btrfs_del_item(trans, root, path); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1313 | *last_ref = 1; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1314 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1315 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1316 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); |
| 1317 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) |
| 1318 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); |
| 1319 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1320 | else { |
| 1321 | struct btrfs_extent_ref_v0 *ref0; |
| 1322 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1323 | struct btrfs_extent_ref_v0); |
| 1324 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); |
| 1325 | } |
| 1326 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1327 | btrfs_mark_buffer_dirty(leaf); |
| 1328 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1329 | return ret; |
| 1330 | } |
| 1331 | |
| 1332 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
| 1333 | struct btrfs_path *path, |
| 1334 | struct btrfs_extent_inline_ref *iref) |
| 1335 | { |
| 1336 | struct btrfs_key key; |
| 1337 | struct extent_buffer *leaf; |
| 1338 | struct btrfs_extent_data_ref *ref1; |
| 1339 | struct btrfs_shared_data_ref *ref2; |
| 1340 | u32 num_refs = 0; |
| 1341 | |
| 1342 | leaf = path->nodes[0]; |
| 1343 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1344 | if (iref) { |
| 1345 | if (btrfs_extent_inline_ref_type(leaf, iref) == |
| 1346 | BTRFS_EXTENT_DATA_REF_KEY) { |
| 1347 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1348 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1349 | } else { |
| 1350 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1351 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1352 | } |
| 1353 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1354 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1355 | struct btrfs_extent_data_ref); |
| 1356 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1357 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1358 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1359 | struct btrfs_shared_data_ref); |
| 1360 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1361 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1362 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1363 | struct btrfs_extent_ref_v0 *ref0; |
| 1364 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1365 | struct btrfs_extent_ref_v0); |
| 1366 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1367 | #endif |
| 1368 | } else { |
| 1369 | WARN_ON(1); |
| 1370 | } |
| 1371 | return num_refs; |
| 1372 | } |
| 1373 | |
| 1374 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1375 | struct btrfs_root *root, |
| 1376 | struct btrfs_path *path, |
| 1377 | u64 bytenr, u64 parent, |
| 1378 | u64 root_objectid) |
| 1379 | { |
| 1380 | struct btrfs_key key; |
| 1381 | int ret; |
| 1382 | |
| 1383 | key.objectid = bytenr; |
| 1384 | if (parent) { |
| 1385 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1386 | key.offset = parent; |
| 1387 | } else { |
| 1388 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1389 | key.offset = root_objectid; |
| 1390 | } |
| 1391 | |
| 1392 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1393 | if (ret > 0) |
| 1394 | ret = -ENOENT; |
| 1395 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1396 | if (ret == -ENOENT && parent) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1397 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1398 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
| 1399 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1400 | if (ret > 0) |
| 1401 | ret = -ENOENT; |
| 1402 | } |
| 1403 | #endif |
| 1404 | return ret; |
| 1405 | } |
| 1406 | |
| 1407 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1408 | struct btrfs_root *root, |
| 1409 | struct btrfs_path *path, |
| 1410 | u64 bytenr, u64 parent, |
| 1411 | u64 root_objectid) |
| 1412 | { |
| 1413 | struct btrfs_key key; |
| 1414 | int ret; |
| 1415 | |
| 1416 | key.objectid = bytenr; |
| 1417 | if (parent) { |
| 1418 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1419 | key.offset = parent; |
| 1420 | } else { |
| 1421 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1422 | key.offset = root_objectid; |
| 1423 | } |
| 1424 | |
| 1425 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1426 | btrfs_release_path(path); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1427 | return ret; |
| 1428 | } |
| 1429 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1430 | static inline int extent_ref_type(u64 parent, u64 owner) |
| 1431 | { |
| 1432 | int type; |
| 1433 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1434 | if (parent > 0) |
| 1435 | type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1436 | else |
| 1437 | type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1438 | } else { |
| 1439 | if (parent > 0) |
| 1440 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 1441 | else |
| 1442 | type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1443 | } |
| 1444 | return type; |
| 1445 | } |
| 1446 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1447 | static int find_next_key(struct btrfs_path *path, int level, |
| 1448 | struct btrfs_key *key) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1449 | |
| 1450 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1451 | for (; level < BTRFS_MAX_LEVEL; level++) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1452 | if (!path->nodes[level]) |
| 1453 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1454 | if (path->slots[level] + 1 >= |
| 1455 | btrfs_header_nritems(path->nodes[level])) |
| 1456 | continue; |
| 1457 | if (level == 0) |
| 1458 | btrfs_item_key_to_cpu(path->nodes[level], key, |
| 1459 | path->slots[level] + 1); |
| 1460 | else |
| 1461 | btrfs_node_key_to_cpu(path->nodes[level], key, |
| 1462 | path->slots[level] + 1); |
| 1463 | return 0; |
| 1464 | } |
| 1465 | return 1; |
| 1466 | } |
| 1467 | |
| 1468 | /* |
| 1469 | * look for inline back ref. if back ref is found, *ref_ret is set |
| 1470 | * to the address of inline back ref, and 0 is returned. |
| 1471 | * |
| 1472 | * if back ref isn't found, *ref_ret is set to the address where it |
| 1473 | * should be inserted, and -ENOENT is returned. |
| 1474 | * |
| 1475 | * if insert is true and there are too many inline back refs, the path |
| 1476 | * points to the extent item, and -EAGAIN is returned. |
| 1477 | * |
| 1478 | * NOTE: inline back refs are ordered in the same way that back ref |
| 1479 | * items in the tree are ordered. |
| 1480 | */ |
| 1481 | static noinline_for_stack |
| 1482 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1483 | struct btrfs_root *root, |
| 1484 | struct btrfs_path *path, |
| 1485 | struct btrfs_extent_inline_ref **ref_ret, |
| 1486 | u64 bytenr, u64 num_bytes, |
| 1487 | u64 parent, u64 root_objectid, |
| 1488 | u64 owner, u64 offset, int insert) |
| 1489 | { |
| 1490 | struct btrfs_key key; |
| 1491 | struct extent_buffer *leaf; |
| 1492 | struct btrfs_extent_item *ei; |
| 1493 | struct btrfs_extent_inline_ref *iref; |
| 1494 | u64 flags; |
| 1495 | u64 item_size; |
| 1496 | unsigned long ptr; |
| 1497 | unsigned long end; |
| 1498 | int extra_size; |
| 1499 | int type; |
| 1500 | int want; |
| 1501 | int ret; |
| 1502 | int err = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1503 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 1504 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1505 | |
| 1506 | key.objectid = bytenr; |
| 1507 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1508 | key.offset = num_bytes; |
| 1509 | |
| 1510 | want = extent_ref_type(parent, owner); |
| 1511 | if (insert) { |
| 1512 | extra_size = btrfs_extent_inline_ref_size(want); |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1513 | path->keep_locks = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1514 | } else |
| 1515 | extra_size = -1; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1516 | |
| 1517 | /* |
| 1518 | * Owner is our parent level, so we can just add one to get the level |
| 1519 | * for the block we are interested in. |
| 1520 | */ |
| 1521 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1522 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 1523 | key.offset = owner; |
| 1524 | } |
| 1525 | |
| 1526 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1527 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
| 1528 | if (ret < 0) { |
| 1529 | err = ret; |
| 1530 | goto out; |
| 1531 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1532 | |
| 1533 | /* |
| 1534 | * We may be a newly converted file system which still has the old fat |
| 1535 | * extent entries for metadata, so try and see if we have one of those. |
| 1536 | */ |
| 1537 | if (ret > 0 && skinny_metadata) { |
| 1538 | skinny_metadata = false; |
| 1539 | if (path->slots[0]) { |
| 1540 | path->slots[0]--; |
| 1541 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 1542 | path->slots[0]); |
| 1543 | if (key.objectid == bytenr && |
| 1544 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 1545 | key.offset == num_bytes) |
| 1546 | ret = 0; |
| 1547 | } |
| 1548 | if (ret) { |
Filipe Manana | 9ce49a0 | 2014-04-24 15:15:28 +0100 | [diff] [blame] | 1549 | key.objectid = bytenr; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1550 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1551 | key.offset = num_bytes; |
| 1552 | btrfs_release_path(path); |
| 1553 | goto again; |
| 1554 | } |
| 1555 | } |
| 1556 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1557 | if (ret && !insert) { |
| 1558 | err = -ENOENT; |
| 1559 | goto out; |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 1560 | } else if (WARN_ON(ret)) { |
Josef Bacik | 492104c | 2013-03-08 15:41:02 -0500 | [diff] [blame] | 1561 | err = -EIO; |
Josef Bacik | 492104c | 2013-03-08 15:41:02 -0500 | [diff] [blame] | 1562 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1563 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1564 | |
| 1565 | leaf = path->nodes[0]; |
| 1566 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1567 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1568 | if (item_size < sizeof(*ei)) { |
| 1569 | if (!insert) { |
| 1570 | err = -ENOENT; |
| 1571 | goto out; |
| 1572 | } |
| 1573 | ret = convert_extent_item_v0(trans, root, path, owner, |
| 1574 | extra_size); |
| 1575 | if (ret < 0) { |
| 1576 | err = ret; |
| 1577 | goto out; |
| 1578 | } |
| 1579 | leaf = path->nodes[0]; |
| 1580 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1581 | } |
| 1582 | #endif |
| 1583 | BUG_ON(item_size < sizeof(*ei)); |
| 1584 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1585 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1586 | flags = btrfs_extent_flags(leaf, ei); |
| 1587 | |
| 1588 | ptr = (unsigned long)(ei + 1); |
| 1589 | end = (unsigned long)ei + item_size; |
| 1590 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1591 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1592 | ptr += sizeof(struct btrfs_tree_block_info); |
| 1593 | BUG_ON(ptr > end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1594 | } |
| 1595 | |
| 1596 | err = -ENOENT; |
| 1597 | while (1) { |
| 1598 | if (ptr >= end) { |
| 1599 | WARN_ON(ptr > end); |
| 1600 | break; |
| 1601 | } |
| 1602 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1603 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1604 | if (want < type) |
| 1605 | break; |
| 1606 | if (want > type) { |
| 1607 | ptr += btrfs_extent_inline_ref_size(type); |
| 1608 | continue; |
| 1609 | } |
| 1610 | |
| 1611 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1612 | struct btrfs_extent_data_ref *dref; |
| 1613 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1614 | if (match_extent_data_ref(leaf, dref, root_objectid, |
| 1615 | owner, offset)) { |
| 1616 | err = 0; |
| 1617 | break; |
| 1618 | } |
| 1619 | if (hash_extent_data_ref_item(leaf, dref) < |
| 1620 | hash_extent_data_ref(root_objectid, owner, offset)) |
| 1621 | break; |
| 1622 | } else { |
| 1623 | u64 ref_offset; |
| 1624 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); |
| 1625 | if (parent > 0) { |
| 1626 | if (parent == ref_offset) { |
| 1627 | err = 0; |
| 1628 | break; |
| 1629 | } |
| 1630 | if (ref_offset < parent) |
| 1631 | break; |
| 1632 | } else { |
| 1633 | if (root_objectid == ref_offset) { |
| 1634 | err = 0; |
| 1635 | break; |
| 1636 | } |
| 1637 | if (ref_offset < root_objectid) |
| 1638 | break; |
| 1639 | } |
| 1640 | } |
| 1641 | ptr += btrfs_extent_inline_ref_size(type); |
| 1642 | } |
| 1643 | if (err == -ENOENT && insert) { |
| 1644 | if (item_size + extra_size >= |
| 1645 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { |
| 1646 | err = -EAGAIN; |
| 1647 | goto out; |
| 1648 | } |
| 1649 | /* |
| 1650 | * To add new inline back ref, we have to make sure |
| 1651 | * there is no corresponding back ref item. |
| 1652 | * For simplicity, we just do not add new inline back |
| 1653 | * ref if there is any kind of item for this block |
| 1654 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1655 | if (find_next_key(path, 0, &key) == 0 && |
| 1656 | key.objectid == bytenr && |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1657 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1658 | err = -EAGAIN; |
| 1659 | goto out; |
| 1660 | } |
| 1661 | } |
| 1662 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; |
| 1663 | out: |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1664 | if (insert) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1665 | path->keep_locks = 0; |
| 1666 | btrfs_unlock_up_safe(path, 1); |
| 1667 | } |
| 1668 | return err; |
| 1669 | } |
| 1670 | |
| 1671 | /* |
| 1672 | * helper to add new inline back ref |
| 1673 | */ |
| 1674 | static noinline_for_stack |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1675 | void setup_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1676 | struct btrfs_path *path, |
| 1677 | struct btrfs_extent_inline_ref *iref, |
| 1678 | u64 parent, u64 root_objectid, |
| 1679 | u64 owner, u64 offset, int refs_to_add, |
| 1680 | struct btrfs_delayed_extent_op *extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1681 | { |
| 1682 | struct extent_buffer *leaf; |
| 1683 | struct btrfs_extent_item *ei; |
| 1684 | unsigned long ptr; |
| 1685 | unsigned long end; |
| 1686 | unsigned long item_offset; |
| 1687 | u64 refs; |
| 1688 | int size; |
| 1689 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1690 | |
| 1691 | leaf = path->nodes[0]; |
| 1692 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1693 | item_offset = (unsigned long)iref - (unsigned long)ei; |
| 1694 | |
| 1695 | type = extent_ref_type(parent, owner); |
| 1696 | size = btrfs_extent_inline_ref_size(type); |
| 1697 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1698 | btrfs_extend_item(root, path, size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1699 | |
| 1700 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1701 | refs = btrfs_extent_refs(leaf, ei); |
| 1702 | refs += refs_to_add; |
| 1703 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1704 | if (extent_op) |
| 1705 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1706 | |
| 1707 | ptr = (unsigned long)ei + item_offset; |
| 1708 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); |
| 1709 | if (ptr < end - size) |
| 1710 | memmove_extent_buffer(leaf, ptr + size, ptr, |
| 1711 | end - size - ptr); |
| 1712 | |
| 1713 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1714 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 1715 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1716 | struct btrfs_extent_data_ref *dref; |
| 1717 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1718 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); |
| 1719 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); |
| 1720 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); |
| 1721 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); |
| 1722 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1723 | struct btrfs_shared_data_ref *sref; |
| 1724 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1725 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); |
| 1726 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1727 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| 1728 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1729 | } else { |
| 1730 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 1731 | } |
| 1732 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, |
| 1736 | struct btrfs_root *root, |
| 1737 | struct btrfs_path *path, |
| 1738 | struct btrfs_extent_inline_ref **ref_ret, |
| 1739 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1740 | u64 root_objectid, u64 owner, u64 offset) |
| 1741 | { |
| 1742 | int ret; |
| 1743 | |
| 1744 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, |
| 1745 | bytenr, num_bytes, parent, |
| 1746 | root_objectid, owner, offset, 0); |
| 1747 | if (ret != -ENOENT) |
| 1748 | return ret; |
| 1749 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1750 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1751 | *ref_ret = NULL; |
| 1752 | |
| 1753 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1754 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, |
| 1755 | root_objectid); |
| 1756 | } else { |
| 1757 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, |
| 1758 | root_objectid, owner, offset); |
| 1759 | } |
| 1760 | return ret; |
| 1761 | } |
| 1762 | |
| 1763 | /* |
| 1764 | * helper to update/remove inline back ref |
| 1765 | */ |
| 1766 | static noinline_for_stack |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1767 | void update_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1768 | struct btrfs_path *path, |
| 1769 | struct btrfs_extent_inline_ref *iref, |
| 1770 | int refs_to_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1771 | struct btrfs_delayed_extent_op *extent_op, |
| 1772 | int *last_ref) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1773 | { |
| 1774 | struct extent_buffer *leaf; |
| 1775 | struct btrfs_extent_item *ei; |
| 1776 | struct btrfs_extent_data_ref *dref = NULL; |
| 1777 | struct btrfs_shared_data_ref *sref = NULL; |
| 1778 | unsigned long ptr; |
| 1779 | unsigned long end; |
| 1780 | u32 item_size; |
| 1781 | int size; |
| 1782 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1783 | u64 refs; |
| 1784 | |
| 1785 | leaf = path->nodes[0]; |
| 1786 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1787 | refs = btrfs_extent_refs(leaf, ei); |
| 1788 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); |
| 1789 | refs += refs_to_mod; |
| 1790 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1791 | if (extent_op) |
| 1792 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1793 | |
| 1794 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1795 | |
| 1796 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1797 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1798 | refs = btrfs_extent_data_ref_count(leaf, dref); |
| 1799 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1800 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1801 | refs = btrfs_shared_data_ref_count(leaf, sref); |
| 1802 | } else { |
| 1803 | refs = 1; |
| 1804 | BUG_ON(refs_to_mod != -1); |
| 1805 | } |
| 1806 | |
| 1807 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
| 1808 | refs += refs_to_mod; |
| 1809 | |
| 1810 | if (refs > 0) { |
| 1811 | if (type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1812 | btrfs_set_extent_data_ref_count(leaf, dref, refs); |
| 1813 | else |
| 1814 | btrfs_set_shared_data_ref_count(leaf, sref, refs); |
| 1815 | } else { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1816 | *last_ref = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1817 | size = btrfs_extent_inline_ref_size(type); |
| 1818 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1819 | ptr = (unsigned long)iref; |
| 1820 | end = (unsigned long)ei + item_size; |
| 1821 | if (ptr + size < end) |
| 1822 | memmove_extent_buffer(leaf, ptr, ptr + size, |
| 1823 | end - ptr - size); |
| 1824 | item_size -= size; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1825 | btrfs_truncate_item(root, path, item_size, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1826 | } |
| 1827 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1828 | } |
| 1829 | |
| 1830 | static noinline_for_stack |
| 1831 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1832 | struct btrfs_root *root, |
| 1833 | struct btrfs_path *path, |
| 1834 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1835 | u64 root_objectid, u64 owner, |
| 1836 | u64 offset, int refs_to_add, |
| 1837 | struct btrfs_delayed_extent_op *extent_op) |
| 1838 | { |
| 1839 | struct btrfs_extent_inline_ref *iref; |
| 1840 | int ret; |
| 1841 | |
| 1842 | ret = lookup_inline_extent_backref(trans, root, path, &iref, |
| 1843 | bytenr, num_bytes, parent, |
| 1844 | root_objectid, owner, offset, 1); |
| 1845 | if (ret == 0) { |
| 1846 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1847 | update_inline_extent_backref(root, path, iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1848 | refs_to_add, extent_op, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1849 | } else if (ret == -ENOENT) { |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1850 | setup_inline_extent_backref(root, path, iref, parent, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1851 | root_objectid, owner, offset, |
| 1852 | refs_to_add, extent_op); |
| 1853 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1854 | } |
| 1855 | return ret; |
| 1856 | } |
| 1857 | |
| 1858 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
| 1859 | struct btrfs_root *root, |
| 1860 | struct btrfs_path *path, |
| 1861 | u64 bytenr, u64 parent, u64 root_objectid, |
| 1862 | u64 owner, u64 offset, int refs_to_add) |
| 1863 | { |
| 1864 | int ret; |
| 1865 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1866 | BUG_ON(refs_to_add != 1); |
| 1867 | ret = insert_tree_block_ref(trans, root, path, bytenr, |
| 1868 | parent, root_objectid); |
| 1869 | } else { |
| 1870 | ret = insert_extent_data_ref(trans, root, path, bytenr, |
| 1871 | parent, root_objectid, |
| 1872 | owner, offset, refs_to_add); |
| 1873 | } |
| 1874 | return ret; |
| 1875 | } |
| 1876 | |
| 1877 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
| 1878 | struct btrfs_root *root, |
| 1879 | struct btrfs_path *path, |
| 1880 | struct btrfs_extent_inline_ref *iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1881 | int refs_to_drop, int is_data, int *last_ref) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1882 | { |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1883 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1884 | |
| 1885 | BUG_ON(!is_data && refs_to_drop != 1); |
| 1886 | if (iref) { |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1887 | update_inline_extent_backref(root, path, iref, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1888 | -refs_to_drop, NULL, last_ref); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1889 | } else if (is_data) { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1890 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop, |
| 1891 | last_ref); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1892 | } else { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1893 | *last_ref = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1894 | ret = btrfs_del_item(trans, root, path); |
| 1895 | } |
| 1896 | return ret; |
| 1897 | } |
| 1898 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1899 | static int btrfs_issue_discard(struct block_device *bdev, |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1900 | u64 start, u64 len) |
| 1901 | { |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1902 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1903 | } |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1904 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1905 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1906 | u64 num_bytes, u64 *actual_bytes) |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1907 | { |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1908 | int ret; |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1909 | u64 discarded_bytes = 0; |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1910 | struct btrfs_bio *bbio = NULL; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1911 | |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 1912 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1913 | /* Tell the block device(s) that the sectors can be discarded */ |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 1914 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1915 | bytenr, &num_bytes, &bbio, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1916 | /* Error condition is -ENOMEM */ |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1917 | if (!ret) { |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1918 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1919 | int i; |
| 1920 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1921 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1922 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
Josef Bacik | d5e2003 | 2011-08-04 14:52:27 +0000 | [diff] [blame] | 1923 | if (!stripe->dev->can_discard) |
| 1924 | continue; |
| 1925 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1926 | ret = btrfs_issue_discard(stripe->dev->bdev, |
| 1927 | stripe->physical, |
| 1928 | stripe->length); |
| 1929 | if (!ret) |
| 1930 | discarded_bytes += stripe->length; |
| 1931 | else if (ret != -EOPNOTSUPP) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1932 | 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] | 1933 | |
| 1934 | /* |
| 1935 | * Just in case we get back EOPNOTSUPP for some reason, |
| 1936 | * just ignore the return value so we don't screw up |
| 1937 | * people calling discard_extent. |
| 1938 | */ |
| 1939 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1940 | } |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1941 | kfree(bbio); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1942 | } |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1943 | |
| 1944 | if (actual_bytes) |
| 1945 | *actual_bytes = discarded_bytes; |
| 1946 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1947 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1948 | if (ret == -EOPNOTSUPP) |
| 1949 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1950 | return ret; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1951 | } |
| 1952 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1953 | /* Can return -ENOMEM */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1954 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
| 1955 | struct btrfs_root *root, |
| 1956 | u64 bytenr, u64 num_bytes, u64 parent, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1957 | u64 root_objectid, u64 owner, u64 offset, |
| 1958 | int no_quota) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1959 | { |
| 1960 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1961 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1962 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1963 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
| 1964 | root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1965 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1966 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1967 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 1968 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1969 | parent, root_objectid, (int)owner, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1970 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1971 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1972 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 1973 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1974 | parent, root_objectid, owner, offset, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1975 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1976 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1977 | return ret; |
| 1978 | } |
| 1979 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1980 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1981 | struct btrfs_root *root, |
| 1982 | u64 bytenr, u64 num_bytes, |
| 1983 | u64 parent, u64 root_objectid, |
| 1984 | u64 owner, u64 offset, int refs_to_add, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1985 | int no_quota, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1986 | struct btrfs_delayed_extent_op *extent_op) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1987 | { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1988 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1989 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1990 | struct extent_buffer *leaf; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1991 | struct btrfs_extent_item *item; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1992 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1993 | u64 refs; |
| 1994 | int ret; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 1995 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_ADD_EXCL; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1996 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1997 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1998 | if (!path) |
| 1999 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2000 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2001 | if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled) |
| 2002 | no_quota = 1; |
| 2003 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2004 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2005 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2006 | /* 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] | 2007 | ret = insert_inline_extent_backref(trans, fs_info->extent_root, path, |
| 2008 | bytenr, num_bytes, parent, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2009 | root_objectid, owner, offset, |
| 2010 | refs_to_add, extent_op); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2011 | if ((ret < 0 && ret != -EAGAIN) || (!ret && no_quota)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2012 | goto out; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2013 | /* |
| 2014 | * Ok we were able to insert an inline extent and it appears to be a new |
| 2015 | * reference, deal with the qgroup accounting. |
| 2016 | */ |
| 2017 | if (!ret && !no_quota) { |
| 2018 | ASSERT(root->fs_info->quota_enabled); |
| 2019 | leaf = path->nodes[0]; |
| 2020 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 2021 | item = btrfs_item_ptr(leaf, path->slots[0], |
| 2022 | struct btrfs_extent_item); |
| 2023 | if (btrfs_extent_refs(leaf, item) > (u64)refs_to_add) |
| 2024 | type = BTRFS_QGROUP_OPER_ADD_SHARED; |
| 2025 | btrfs_release_path(path); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2026 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2027 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 2028 | bytenr, num_bytes, type, 0); |
| 2029 | goto out; |
| 2030 | } |
| 2031 | |
| 2032 | /* |
| 2033 | * Ok we had -EAGAIN which means we didn't have space to insert and |
| 2034 | * inline extent ref, so just update the reference count and add a |
| 2035 | * normal backref. |
| 2036 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2037 | leaf = path->nodes[0]; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2038 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2039 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2040 | refs = btrfs_extent_refs(leaf, item); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2041 | if (refs) |
| 2042 | type = BTRFS_QGROUP_OPER_ADD_SHARED; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2043 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); |
| 2044 | if (extent_op) |
| 2045 | __run_delayed_extent_op(extent_op, leaf, item); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2046 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2047 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2048 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2049 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2050 | if (!no_quota) { |
| 2051 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 2052 | bytenr, num_bytes, type, 0); |
| 2053 | if (ret) |
| 2054 | goto out; |
| 2055 | } |
| 2056 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2057 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2058 | path->leave_spinning = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2059 | /* now insert the actual backref */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2060 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2061 | path, bytenr, parent, root_objectid, |
| 2062 | owner, offset, refs_to_add); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2063 | if (ret) |
| 2064 | btrfs_abort_transaction(trans, root, ret); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2065 | out: |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2066 | btrfs_free_path(path); |
Liu Bo | 30d133f | 2013-10-11 16:30:23 +0800 | [diff] [blame] | 2067 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 2068 | } |
| 2069 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2070 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
| 2071 | struct btrfs_root *root, |
| 2072 | struct btrfs_delayed_ref_node *node, |
| 2073 | struct btrfs_delayed_extent_op *extent_op, |
| 2074 | int insert_reserved) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2075 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2076 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2077 | struct btrfs_delayed_data_ref *ref; |
| 2078 | struct btrfs_key ins; |
| 2079 | u64 parent = 0; |
| 2080 | u64 ref_root = 0; |
| 2081 | u64 flags = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2082 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2083 | ins.objectid = node->bytenr; |
| 2084 | ins.offset = node->num_bytes; |
| 2085 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2086 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2087 | ref = btrfs_delayed_node_to_data_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2088 | trace_run_delayed_data_ref(node, ref, node->action); |
| 2089 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2090 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2091 | parent = ref->parent; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2092 | ref_root = ref->root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2093 | |
| 2094 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2095 | if (extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2096 | flags |= extent_op->flags_to_set; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2097 | ret = alloc_reserved_file_extent(trans, root, |
| 2098 | parent, ref_root, flags, |
| 2099 | ref->objectid, ref->offset, |
| 2100 | &ins, node->ref_mod); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2101 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2102 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2103 | node->num_bytes, parent, |
| 2104 | ref_root, ref->objectid, |
| 2105 | ref->offset, node->ref_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2106 | node->no_quota, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2107 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2108 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2109 | node->num_bytes, parent, |
| 2110 | ref_root, ref->objectid, |
| 2111 | ref->offset, node->ref_mod, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2112 | extent_op, node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2113 | } else { |
| 2114 | BUG(); |
| 2115 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2116 | return ret; |
| 2117 | } |
| 2118 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2119 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 2120 | struct extent_buffer *leaf, |
| 2121 | struct btrfs_extent_item *ei) |
| 2122 | { |
| 2123 | u64 flags = btrfs_extent_flags(leaf, ei); |
| 2124 | if (extent_op->update_flags) { |
| 2125 | flags |= extent_op->flags_to_set; |
| 2126 | btrfs_set_extent_flags(leaf, ei, flags); |
| 2127 | } |
| 2128 | |
| 2129 | if (extent_op->update_key) { |
| 2130 | struct btrfs_tree_block_info *bi; |
| 2131 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); |
| 2132 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 2133 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); |
| 2134 | } |
| 2135 | } |
| 2136 | |
| 2137 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, |
| 2138 | struct btrfs_root *root, |
| 2139 | struct btrfs_delayed_ref_node *node, |
| 2140 | struct btrfs_delayed_extent_op *extent_op) |
| 2141 | { |
| 2142 | struct btrfs_key key; |
| 2143 | struct btrfs_path *path; |
| 2144 | struct btrfs_extent_item *ei; |
| 2145 | struct extent_buffer *leaf; |
| 2146 | u32 item_size; |
| 2147 | int ret; |
| 2148 | int err = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2149 | int metadata = !extent_op->is_data; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2150 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2151 | if (trans->aborted) |
| 2152 | return 0; |
| 2153 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2154 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2155 | metadata = 0; |
| 2156 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2157 | path = btrfs_alloc_path(); |
| 2158 | if (!path) |
| 2159 | return -ENOMEM; |
| 2160 | |
| 2161 | key.objectid = node->bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2162 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2163 | if (metadata) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2164 | key.type = BTRFS_METADATA_ITEM_KEY; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2165 | key.offset = extent_op->level; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2166 | } else { |
| 2167 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2168 | key.offset = node->num_bytes; |
| 2169 | } |
| 2170 | |
| 2171 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2172 | path->reada = 1; |
| 2173 | path->leave_spinning = 1; |
| 2174 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, |
| 2175 | path, 0, 1); |
| 2176 | if (ret < 0) { |
| 2177 | err = ret; |
| 2178 | goto out; |
| 2179 | } |
| 2180 | if (ret > 0) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2181 | if (metadata) { |
Filipe David Borba Manana | 5599488 | 2013-10-18 15:42:56 +0100 | [diff] [blame] | 2182 | if (path->slots[0] > 0) { |
| 2183 | path->slots[0]--; |
| 2184 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 2185 | path->slots[0]); |
| 2186 | if (key.objectid == node->bytenr && |
| 2187 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 2188 | key.offset == node->num_bytes) |
| 2189 | ret = 0; |
| 2190 | } |
| 2191 | if (ret > 0) { |
| 2192 | btrfs_release_path(path); |
| 2193 | metadata = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2194 | |
Filipe David Borba Manana | 5599488 | 2013-10-18 15:42:56 +0100 | [diff] [blame] | 2195 | key.objectid = node->bytenr; |
| 2196 | key.offset = node->num_bytes; |
| 2197 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2198 | goto again; |
| 2199 | } |
| 2200 | } else { |
| 2201 | err = -EIO; |
| 2202 | goto out; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2203 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2204 | } |
| 2205 | |
| 2206 | leaf = path->nodes[0]; |
| 2207 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2208 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 2209 | if (item_size < sizeof(*ei)) { |
| 2210 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, |
| 2211 | path, (u64)-1, 0); |
| 2212 | if (ret < 0) { |
| 2213 | err = ret; |
| 2214 | goto out; |
| 2215 | } |
| 2216 | leaf = path->nodes[0]; |
| 2217 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2218 | } |
| 2219 | #endif |
| 2220 | BUG_ON(item_size < sizeof(*ei)); |
| 2221 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2222 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 2223 | |
| 2224 | btrfs_mark_buffer_dirty(leaf); |
| 2225 | out: |
| 2226 | btrfs_free_path(path); |
| 2227 | return err; |
| 2228 | } |
| 2229 | |
| 2230 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
| 2231 | struct btrfs_root *root, |
| 2232 | struct btrfs_delayed_ref_node *node, |
| 2233 | struct btrfs_delayed_extent_op *extent_op, |
| 2234 | int insert_reserved) |
| 2235 | { |
| 2236 | int ret = 0; |
| 2237 | struct btrfs_delayed_tree_ref *ref; |
| 2238 | struct btrfs_key ins; |
| 2239 | u64 parent = 0; |
| 2240 | u64 ref_root = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2241 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 2242 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2243 | |
| 2244 | ref = btrfs_delayed_node_to_tree_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2245 | trace_run_delayed_tree_ref(node, ref, node->action); |
| 2246 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2247 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2248 | parent = ref->parent; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2249 | ref_root = ref->root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2250 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2251 | ins.objectid = node->bytenr; |
| 2252 | if (skinny_metadata) { |
| 2253 | ins.offset = ref->level; |
| 2254 | ins.type = BTRFS_METADATA_ITEM_KEY; |
| 2255 | } else { |
| 2256 | ins.offset = node->num_bytes; |
| 2257 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
| 2258 | } |
| 2259 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2260 | BUG_ON(node->ref_mod != 1); |
| 2261 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2262 | BUG_ON(!extent_op || !extent_op->update_flags); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2263 | ret = alloc_reserved_tree_block(trans, root, |
| 2264 | parent, ref_root, |
| 2265 | extent_op->flags_to_set, |
| 2266 | &extent_op->key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2267 | ref->level, &ins, |
| 2268 | node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2269 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2270 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2271 | node->num_bytes, parent, ref_root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2272 | ref->level, 0, 1, node->no_quota, |
| 2273 | extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2274 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2275 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2276 | node->num_bytes, parent, ref_root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2277 | ref->level, 0, 1, extent_op, |
| 2278 | node->no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2279 | } else { |
| 2280 | BUG(); |
| 2281 | } |
| 2282 | return ret; |
| 2283 | } |
| 2284 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2285 | /* helper function to actually process a single delayed ref entry */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2286 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
| 2287 | struct btrfs_root *root, |
| 2288 | struct btrfs_delayed_ref_node *node, |
| 2289 | struct btrfs_delayed_extent_op *extent_op, |
| 2290 | int insert_reserved) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2291 | { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2292 | int ret = 0; |
| 2293 | |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2294 | if (trans->aborted) { |
| 2295 | if (insert_reserved) |
| 2296 | btrfs_pin_extent(root, node->bytenr, |
| 2297 | node->num_bytes, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2298 | return 0; |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2299 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2300 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2301 | if (btrfs_delayed_ref_is_head(node)) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2302 | struct btrfs_delayed_ref_head *head; |
| 2303 | /* |
| 2304 | * we've hit the end of the chain and we were supposed |
| 2305 | * to insert this extent into the tree. But, it got |
| 2306 | * deleted before we ever needed to insert it, so all |
| 2307 | * we have to do is clean up the accounting |
| 2308 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2309 | BUG_ON(extent_op); |
| 2310 | head = btrfs_delayed_node_to_head(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2311 | trace_run_delayed_ref_head(node, head, node->action); |
| 2312 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2313 | if (insert_reserved) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 2314 | btrfs_pin_extent(root, node->bytenr, |
| 2315 | node->num_bytes, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2316 | if (head->is_data) { |
| 2317 | ret = btrfs_del_csums(trans, root, |
| 2318 | node->bytenr, |
| 2319 | node->num_bytes); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2320 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2321 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2322 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2323 | } |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 2324 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2325 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
| 2326 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2327 | ret = run_delayed_tree_ref(trans, root, node, extent_op, |
| 2328 | insert_reserved); |
| 2329 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || |
| 2330 | node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2331 | ret = run_delayed_data_ref(trans, root, node, extent_op, |
| 2332 | insert_reserved); |
| 2333 | else |
| 2334 | BUG(); |
| 2335 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2336 | } |
| 2337 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2338 | static noinline struct btrfs_delayed_ref_node * |
| 2339 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2340 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2341 | struct rb_node *node; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2342 | struct btrfs_delayed_ref_node *ref, *last = NULL;; |
| 2343 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2344 | /* |
| 2345 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. |
| 2346 | * this prevents ref count from going down to zero when |
| 2347 | * there still are pending delayed ref. |
| 2348 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2349 | node = rb_first(&head->ref_root); |
| 2350 | while (node) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2351 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 2352 | rb_node); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2353 | if (ref->action == BTRFS_ADD_DELAYED_REF) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2354 | return ref; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2355 | else if (last == NULL) |
| 2356 | last = ref; |
| 2357 | node = rb_next(node); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2358 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2359 | return last; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2360 | } |
| 2361 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2362 | /* |
| 2363 | * Returns 0 on success or if called with an already aborted transaction. |
| 2364 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. |
| 2365 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2366 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 2367 | struct btrfs_root *root, |
| 2368 | unsigned long nr) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2369 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2370 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2371 | struct btrfs_delayed_ref_node *ref; |
| 2372 | struct btrfs_delayed_ref_head *locked_ref = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2373 | struct btrfs_delayed_extent_op *extent_op; |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2374 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2375 | ktime_t start = ktime_get(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2376 | int ret; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2377 | unsigned long count = 0; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2378 | unsigned long actual_count = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2379 | int must_insert_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2380 | |
| 2381 | delayed_refs = &trans->transaction->delayed_refs; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2382 | while (1) { |
| 2383 | if (!locked_ref) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2384 | if (count >= nr) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2385 | break; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2386 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2387 | spin_lock(&delayed_refs->lock); |
| 2388 | locked_ref = btrfs_select_ref_head(trans); |
| 2389 | if (!locked_ref) { |
| 2390 | spin_unlock(&delayed_refs->lock); |
| 2391 | break; |
| 2392 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2393 | |
| 2394 | /* grab the lock that says we are going to process |
| 2395 | * all the refs for this head */ |
| 2396 | ret = btrfs_delayed_ref_lock(trans, locked_ref); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2397 | spin_unlock(&delayed_refs->lock); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2398 | /* |
| 2399 | * we may have dropped the spin lock to get the head |
| 2400 | * mutex lock, and that might have given someone else |
| 2401 | * time to free the head. If that's true, it has been |
| 2402 | * removed from our list and we can move on. |
| 2403 | */ |
| 2404 | if (ret == -EAGAIN) { |
| 2405 | locked_ref = NULL; |
| 2406 | count++; |
| 2407 | continue; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2408 | } |
| 2409 | } |
| 2410 | |
| 2411 | /* |
Josef Bacik | ae1e206 | 2012-08-07 16:00:32 -0400 | [diff] [blame] | 2412 | * We need to try and merge add/drops of the same ref since we |
| 2413 | * can run into issues with relocate dropping the implicit ref |
| 2414 | * and then it being added back again before the drop can |
| 2415 | * finish. If we merged anything we need to re-loop so we can |
| 2416 | * get a good ref. |
| 2417 | */ |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2418 | spin_lock(&locked_ref->lock); |
Josef Bacik | ae1e206 | 2012-08-07 16:00:32 -0400 | [diff] [blame] | 2419 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, |
| 2420 | locked_ref); |
| 2421 | |
| 2422 | /* |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2423 | * locked_ref is the head node, so we have to go one |
| 2424 | * node back for any delayed ref updates |
| 2425 | */ |
| 2426 | ref = select_delayed_ref(locked_ref); |
| 2427 | |
| 2428 | if (ref && ref->seq && |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2429 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2430 | spin_unlock(&locked_ref->lock); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2431 | btrfs_delayed_ref_unlock(locked_ref); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2432 | spin_lock(&delayed_refs->lock); |
| 2433 | locked_ref->processing = 0; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2434 | delayed_refs->num_heads_ready++; |
| 2435 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2436 | locked_ref = NULL; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2437 | cond_resched(); |
Josef Bacik | 27a377d | 2014-02-07 13:57:59 -0500 | [diff] [blame] | 2438 | count++; |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2439 | continue; |
| 2440 | } |
| 2441 | |
| 2442 | /* |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2443 | * record the must insert reserved flag before we |
| 2444 | * drop the spin lock. |
| 2445 | */ |
| 2446 | must_insert_reserved = locked_ref->must_insert_reserved; |
| 2447 | locked_ref->must_insert_reserved = 0; |
| 2448 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2449 | extent_op = locked_ref->extent_op; |
| 2450 | locked_ref->extent_op = NULL; |
| 2451 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2452 | if (!ref) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2453 | |
| 2454 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2455 | /* All delayed refs have been processed, Go ahead |
| 2456 | * and send the head node to run_one_delayed_ref, |
| 2457 | * so that any accounting fixes can happen |
| 2458 | */ |
| 2459 | ref = &locked_ref->node; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2460 | |
| 2461 | if (extent_op && must_insert_reserved) { |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2462 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2463 | extent_op = NULL; |
| 2464 | } |
| 2465 | |
| 2466 | if (extent_op) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2467 | spin_unlock(&locked_ref->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2468 | ret = run_delayed_extent_op(trans, root, |
| 2469 | ref, extent_op); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2470 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2471 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2472 | if (ret) { |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 2473 | /* |
| 2474 | * Need to reset must_insert_reserved if |
| 2475 | * there was an error so the abort stuff |
| 2476 | * can cleanup the reserved space |
| 2477 | * properly. |
| 2478 | */ |
| 2479 | if (must_insert_reserved) |
| 2480 | locked_ref->must_insert_reserved = 1; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2481 | locked_ref->processing = 0; |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2482 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2483 | btrfs_delayed_ref_unlock(locked_ref); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2484 | return ret; |
| 2485 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2486 | continue; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2487 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2488 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2489 | /* |
| 2490 | * Need to drop our head ref lock and re-aqcuire the |
| 2491 | * delayed ref lock and then re-check to make sure |
| 2492 | * nobody got added. |
| 2493 | */ |
| 2494 | spin_unlock(&locked_ref->lock); |
| 2495 | spin_lock(&delayed_refs->lock); |
| 2496 | spin_lock(&locked_ref->lock); |
Josef Bacik | 573a075 | 2014-03-27 19:41:34 -0400 | [diff] [blame] | 2497 | if (rb_first(&locked_ref->ref_root) || |
| 2498 | locked_ref->extent_op) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2499 | spin_unlock(&locked_ref->lock); |
| 2500 | spin_unlock(&delayed_refs->lock); |
| 2501 | continue; |
| 2502 | } |
| 2503 | ref->in_tree = 0; |
| 2504 | delayed_refs->num_heads--; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2505 | rb_erase(&locked_ref->href_node, |
| 2506 | &delayed_refs->href_root); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2507 | spin_unlock(&delayed_refs->lock); |
| 2508 | } else { |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2509 | actual_count++; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2510 | ref->in_tree = 0; |
| 2511 | rb_erase(&ref->rb_node, &locked_ref->ref_root); |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2512 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2513 | atomic_dec(&delayed_refs->num_entries); |
| 2514 | |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2515 | if (!btrfs_delayed_ref_is_head(ref)) { |
Arne Jansen | 22cd2e7 | 2012-08-09 00:16:53 -0600 | [diff] [blame] | 2516 | /* |
| 2517 | * when we play the delayed ref, also correct the |
| 2518 | * ref_mod on head |
| 2519 | */ |
| 2520 | switch (ref->action) { |
| 2521 | case BTRFS_ADD_DELAYED_REF: |
| 2522 | case BTRFS_ADD_DELAYED_EXTENT: |
| 2523 | locked_ref->node.ref_mod -= ref->ref_mod; |
| 2524 | break; |
| 2525 | case BTRFS_DROP_DELAYED_REF: |
| 2526 | locked_ref->node.ref_mod += ref->ref_mod; |
| 2527 | break; |
| 2528 | default: |
| 2529 | WARN_ON(1); |
| 2530 | } |
| 2531 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2532 | spin_unlock(&locked_ref->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2533 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2534 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2535 | must_insert_reserved); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2536 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2537 | btrfs_free_delayed_extent_op(extent_op); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2538 | if (ret) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2539 | locked_ref->processing = 0; |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2540 | btrfs_delayed_ref_unlock(locked_ref); |
| 2541 | btrfs_put_delayed_ref(ref); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2542 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2543 | return ret; |
| 2544 | } |
| 2545 | |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2546 | /* |
| 2547 | * If this node is a head, that means all the refs in this head |
| 2548 | * have been dealt with, and we will pick the next head to deal |
| 2549 | * with, so we must unlock the head and drop it from the cluster |
| 2550 | * list before we release it. |
| 2551 | */ |
| 2552 | if (btrfs_delayed_ref_is_head(ref)) { |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2553 | btrfs_delayed_ref_unlock(locked_ref); |
| 2554 | locked_ref = NULL; |
| 2555 | } |
| 2556 | btrfs_put_delayed_ref(ref); |
| 2557 | count++; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2558 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2559 | } |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2560 | |
| 2561 | /* |
| 2562 | * We don't want to include ref heads since we can have empty ref heads |
| 2563 | * and those will drastically skew our runtime down since we just do |
| 2564 | * accounting, no actual extent tree updates. |
| 2565 | */ |
| 2566 | if (actual_count > 0) { |
| 2567 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); |
| 2568 | u64 avg; |
| 2569 | |
| 2570 | /* |
| 2571 | * We weigh the current average higher than our current runtime |
| 2572 | * to avoid large swings in the average. |
| 2573 | */ |
| 2574 | spin_lock(&delayed_refs->lock); |
| 2575 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; |
| 2576 | avg = div64_u64(avg, 4); |
| 2577 | fs_info->avg_delayed_ref_runtime = avg; |
| 2578 | spin_unlock(&delayed_refs->lock); |
| 2579 | } |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2580 | return 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2581 | } |
| 2582 | |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2583 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2584 | /* |
| 2585 | * Normally delayed refs get processed in ascending bytenr order. This |
| 2586 | * correlates in most cases to the order added. To expose dependencies on this |
| 2587 | * order, we start to process the tree in the middle instead of the beginning |
| 2588 | */ |
| 2589 | static u64 find_middle(struct rb_root *root) |
| 2590 | { |
| 2591 | struct rb_node *n = root->rb_node; |
| 2592 | struct btrfs_delayed_ref_node *entry; |
| 2593 | int alt = 1; |
| 2594 | u64 middle; |
| 2595 | u64 first = 0, last = 0; |
| 2596 | |
| 2597 | n = rb_first(root); |
| 2598 | if (n) { |
| 2599 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2600 | first = entry->bytenr; |
| 2601 | } |
| 2602 | n = rb_last(root); |
| 2603 | if (n) { |
| 2604 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2605 | last = entry->bytenr; |
| 2606 | } |
| 2607 | n = root->rb_node; |
| 2608 | |
| 2609 | while (n) { |
| 2610 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2611 | WARN_ON(!entry->in_tree); |
| 2612 | |
| 2613 | middle = entry->bytenr; |
| 2614 | |
| 2615 | if (alt) |
| 2616 | n = n->rb_left; |
| 2617 | else |
| 2618 | n = n->rb_right; |
| 2619 | |
| 2620 | alt = 1 - alt; |
| 2621 | } |
| 2622 | return middle; |
| 2623 | } |
| 2624 | #endif |
| 2625 | |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2626 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
| 2627 | { |
| 2628 | u64 num_bytes; |
| 2629 | |
| 2630 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + |
| 2631 | sizeof(struct btrfs_extent_inline_ref)); |
| 2632 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2633 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); |
| 2634 | |
| 2635 | /* |
| 2636 | * We don't ever fill up leaves all the way so multiply by 2 just to be |
| 2637 | * closer to what we're really going to want to ouse. |
| 2638 | */ |
| 2639 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); |
| 2640 | } |
| 2641 | |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2642 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2643 | struct btrfs_root *root) |
| 2644 | { |
| 2645 | struct btrfs_block_rsv *global_rsv; |
| 2646 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; |
| 2647 | u64 num_bytes; |
| 2648 | int ret = 0; |
| 2649 | |
| 2650 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 2651 | num_heads = heads_to_leaves(root, num_heads); |
| 2652 | if (num_heads > 1) |
| 2653 | num_bytes += (num_heads - 1) * root->leafsize; |
| 2654 | num_bytes <<= 1; |
| 2655 | global_rsv = &root->fs_info->global_block_rsv; |
| 2656 | |
| 2657 | /* |
| 2658 | * If we can't allocate any more chunks lets make sure we have _lots_ of |
| 2659 | * wiggle room since running delayed refs can create more delayed refs. |
| 2660 | */ |
| 2661 | if (global_rsv->space_info->full) |
| 2662 | num_bytes <<= 1; |
| 2663 | |
| 2664 | spin_lock(&global_rsv->lock); |
| 2665 | if (global_rsv->reserved <= num_bytes) |
| 2666 | ret = 1; |
| 2667 | spin_unlock(&global_rsv->lock); |
| 2668 | return ret; |
| 2669 | } |
| 2670 | |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2671 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
| 2672 | struct btrfs_root *root) |
| 2673 | { |
| 2674 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2675 | u64 num_entries = |
| 2676 | atomic_read(&trans->transaction->delayed_refs.num_entries); |
| 2677 | u64 avg_runtime; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2678 | u64 val; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2679 | |
| 2680 | smp_mb(); |
| 2681 | avg_runtime = fs_info->avg_delayed_ref_runtime; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2682 | val = num_entries * avg_runtime; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2683 | if (num_entries * avg_runtime >= NSEC_PER_SEC) |
| 2684 | return 1; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2685 | if (val >= NSEC_PER_SEC / 2) |
| 2686 | return 2; |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 2687 | |
| 2688 | return btrfs_check_space_for_delayed_refs(trans, root); |
| 2689 | } |
| 2690 | |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 2691 | struct async_delayed_refs { |
| 2692 | struct btrfs_root *root; |
| 2693 | int count; |
| 2694 | int error; |
| 2695 | int sync; |
| 2696 | struct completion wait; |
| 2697 | struct btrfs_work work; |
| 2698 | }; |
| 2699 | |
| 2700 | static void delayed_ref_async_start(struct btrfs_work *work) |
| 2701 | { |
| 2702 | struct async_delayed_refs *async; |
| 2703 | struct btrfs_trans_handle *trans; |
| 2704 | int ret; |
| 2705 | |
| 2706 | async = container_of(work, struct async_delayed_refs, work); |
| 2707 | |
| 2708 | trans = btrfs_join_transaction(async->root); |
| 2709 | if (IS_ERR(trans)) { |
| 2710 | async->error = PTR_ERR(trans); |
| 2711 | goto done; |
| 2712 | } |
| 2713 | |
| 2714 | /* |
| 2715 | * trans->sync means that when we call end_transaciton, we won't |
| 2716 | * wait on delayed refs |
| 2717 | */ |
| 2718 | trans->sync = true; |
| 2719 | ret = btrfs_run_delayed_refs(trans, async->root, async->count); |
| 2720 | if (ret) |
| 2721 | async->error = ret; |
| 2722 | |
| 2723 | ret = btrfs_end_transaction(trans, async->root); |
| 2724 | if (ret && !async->error) |
| 2725 | async->error = ret; |
| 2726 | done: |
| 2727 | if (async->sync) |
| 2728 | complete(&async->wait); |
| 2729 | else |
| 2730 | kfree(async); |
| 2731 | } |
| 2732 | |
| 2733 | int btrfs_async_run_delayed_refs(struct btrfs_root *root, |
| 2734 | unsigned long count, int wait) |
| 2735 | { |
| 2736 | struct async_delayed_refs *async; |
| 2737 | int ret; |
| 2738 | |
| 2739 | async = kmalloc(sizeof(*async), GFP_NOFS); |
| 2740 | if (!async) |
| 2741 | return -ENOMEM; |
| 2742 | |
| 2743 | async->root = root->fs_info->tree_root; |
| 2744 | async->count = count; |
| 2745 | async->error = 0; |
| 2746 | if (wait) |
| 2747 | async->sync = 1; |
| 2748 | else |
| 2749 | async->sync = 0; |
| 2750 | init_completion(&async->wait); |
| 2751 | |
| 2752 | btrfs_init_work(&async->work, delayed_ref_async_start, |
| 2753 | NULL, NULL); |
| 2754 | |
| 2755 | btrfs_queue_work(root->fs_info->extent_workers, &async->work); |
| 2756 | |
| 2757 | if (wait) { |
| 2758 | wait_for_completion(&async->wait); |
| 2759 | ret = async->error; |
| 2760 | kfree(async); |
| 2761 | return ret; |
| 2762 | } |
| 2763 | return 0; |
| 2764 | } |
| 2765 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2766 | /* |
| 2767 | * this starts processing the delayed reference count updates and |
| 2768 | * extent insertions we have queued up so far. count can be |
| 2769 | * 0, which means to process everything in the tree at the start |
| 2770 | * of the run (but not newly added entries), or it can be some target |
| 2771 | * number you'd like to process. |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2772 | * |
| 2773 | * Returns 0 on success or if called with an aborted transaction |
| 2774 | * Returns <0 on error and aborts the transaction |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2775 | */ |
| 2776 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 2777 | struct btrfs_root *root, unsigned long count) |
| 2778 | { |
| 2779 | struct rb_node *node; |
| 2780 | struct btrfs_delayed_ref_root *delayed_refs; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2781 | struct btrfs_delayed_ref_head *head; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2782 | int ret; |
| 2783 | int run_all = count == (unsigned long)-1; |
| 2784 | int run_most = 0; |
| 2785 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2786 | /* We'll clean this up in btrfs_cleanup_transaction */ |
| 2787 | if (trans->aborted) |
| 2788 | return 0; |
| 2789 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2790 | if (root == root->fs_info->extent_root) |
| 2791 | root = root->fs_info->tree_root; |
| 2792 | |
| 2793 | delayed_refs = &trans->transaction->delayed_refs; |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2794 | if (count == 0) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2795 | count = atomic_read(&delayed_refs->num_entries) * 2; |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2796 | run_most = 1; |
| 2797 | } |
| 2798 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2799 | again: |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2800 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2801 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); |
| 2802 | #endif |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2803 | ret = __btrfs_run_delayed_refs(trans, root, count); |
| 2804 | if (ret < 0) { |
| 2805 | btrfs_abort_transaction(trans, root, ret); |
| 2806 | return ret; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2807 | } |
| 2808 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2809 | if (run_all) { |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2810 | if (!list_empty(&trans->new_bgs)) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 2811 | btrfs_create_pending_block_groups(trans, root); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 2812 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2813 | spin_lock(&delayed_refs->lock); |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2814 | node = rb_first(&delayed_refs->href_root); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2815 | if (!node) { |
| 2816 | spin_unlock(&delayed_refs->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2817 | goto out; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2818 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2819 | count = (unsigned long)-1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2820 | |
| 2821 | while (node) { |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2822 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
| 2823 | href_node); |
| 2824 | if (btrfs_delayed_ref_is_head(&head->node)) { |
| 2825 | struct btrfs_delayed_ref_node *ref; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2826 | |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2827 | ref = &head->node; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2828 | atomic_inc(&ref->refs); |
| 2829 | |
| 2830 | spin_unlock(&delayed_refs->lock); |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2831 | /* |
| 2832 | * Mutex was contended, block until it's |
| 2833 | * released and try again |
| 2834 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2835 | mutex_lock(&head->mutex); |
| 2836 | mutex_unlock(&head->mutex); |
| 2837 | |
| 2838 | btrfs_put_delayed_ref(ref); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2839 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2840 | goto again; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 2841 | } else { |
| 2842 | WARN_ON(1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2843 | } |
| 2844 | node = rb_next(node); |
| 2845 | } |
| 2846 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2847 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2848 | goto again; |
| 2849 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2850 | out: |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 2851 | ret = btrfs_delayed_qgroup_accounting(trans, root->fs_info); |
| 2852 | if (ret) |
| 2853 | return ret; |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 2854 | assert_qgroups_uptodate(trans); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2855 | return 0; |
| 2856 | } |
| 2857 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2858 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
| 2859 | struct btrfs_root *root, |
| 2860 | u64 bytenr, u64 num_bytes, u64 flags, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2861 | int level, int is_data) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2862 | { |
| 2863 | struct btrfs_delayed_extent_op *extent_op; |
| 2864 | int ret; |
| 2865 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2866 | extent_op = btrfs_alloc_delayed_extent_op(); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2867 | if (!extent_op) |
| 2868 | return -ENOMEM; |
| 2869 | |
| 2870 | extent_op->flags_to_set = flags; |
| 2871 | extent_op->update_flags = 1; |
| 2872 | extent_op->update_key = 0; |
| 2873 | extent_op->is_data = is_data ? 1 : 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2874 | extent_op->level = level; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2875 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 2876 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
| 2877 | num_bytes, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2878 | if (ret) |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2879 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2880 | return ret; |
| 2881 | } |
| 2882 | |
| 2883 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, |
| 2884 | struct btrfs_root *root, |
| 2885 | struct btrfs_path *path, |
| 2886 | u64 objectid, u64 offset, u64 bytenr) |
| 2887 | { |
| 2888 | struct btrfs_delayed_ref_head *head; |
| 2889 | struct btrfs_delayed_ref_node *ref; |
| 2890 | struct btrfs_delayed_data_ref *data_ref; |
| 2891 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2892 | struct rb_node *node; |
| 2893 | int ret = 0; |
| 2894 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2895 | delayed_refs = &trans->transaction->delayed_refs; |
| 2896 | spin_lock(&delayed_refs->lock); |
| 2897 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2898 | if (!head) { |
| 2899 | spin_unlock(&delayed_refs->lock); |
| 2900 | return 0; |
| 2901 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2902 | |
| 2903 | if (!mutex_trylock(&head->mutex)) { |
| 2904 | atomic_inc(&head->node.refs); |
| 2905 | spin_unlock(&delayed_refs->lock); |
| 2906 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2907 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2908 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2909 | /* |
| 2910 | * Mutex was contended, block until it's released and let |
| 2911 | * caller try again |
| 2912 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2913 | mutex_lock(&head->mutex); |
| 2914 | mutex_unlock(&head->mutex); |
| 2915 | btrfs_put_delayed_ref(&head->node); |
| 2916 | return -EAGAIN; |
| 2917 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2918 | spin_unlock(&delayed_refs->lock); |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 2919 | |
| 2920 | spin_lock(&head->lock); |
| 2921 | node = rb_first(&head->ref_root); |
| 2922 | while (node) { |
| 2923 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
| 2924 | node = rb_next(node); |
| 2925 | |
| 2926 | /* If it's a shared ref we know a cross reference exists */ |
| 2927 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { |
| 2928 | ret = 1; |
| 2929 | break; |
| 2930 | } |
| 2931 | |
| 2932 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
| 2933 | |
| 2934 | /* |
| 2935 | * If our ref doesn't match the one we're currently looking at |
| 2936 | * then we have a cross reference. |
| 2937 | */ |
| 2938 | if (data_ref->root != root->root_key.objectid || |
| 2939 | data_ref->objectid != objectid || |
| 2940 | data_ref->offset != offset) { |
| 2941 | ret = 1; |
| 2942 | break; |
| 2943 | } |
| 2944 | } |
| 2945 | spin_unlock(&head->lock); |
| 2946 | mutex_unlock(&head->mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2947 | return ret; |
| 2948 | } |
| 2949 | |
| 2950 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, |
| 2951 | struct btrfs_root *root, |
| 2952 | struct btrfs_path *path, |
| 2953 | u64 objectid, u64 offset, u64 bytenr) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2954 | { |
| 2955 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2956 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2957 | struct btrfs_extent_data_ref *ref; |
| 2958 | struct btrfs_extent_inline_ref *iref; |
| 2959 | struct btrfs_extent_item *ei; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2960 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2961 | u32 item_size; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2962 | int ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2963 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2964 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2965 | key.offset = (u64)-1; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2966 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2967 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2968 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 2969 | if (ret < 0) |
| 2970 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2971 | BUG_ON(ret == 0); /* Corruption */ |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 2972 | |
| 2973 | ret = -ENOENT; |
| 2974 | if (path->slots[0] == 0) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2975 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2976 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2977 | path->slots[0]--; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2978 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2979 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2980 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2981 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2982 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2983 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2984 | ret = 1; |
| 2985 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2986 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 2987 | if (item_size < sizeof(*ei)) { |
| 2988 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); |
| 2989 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2990 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2991 | #endif |
| 2992 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2993 | |
| 2994 | if (item_size != sizeof(*ei) + |
| 2995 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) |
| 2996 | goto out; |
| 2997 | |
| 2998 | if (btrfs_extent_generation(leaf, ei) <= |
| 2999 | btrfs_root_last_snapshot(&root->root_item)) |
| 3000 | goto out; |
| 3001 | |
| 3002 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| 3003 | if (btrfs_extent_inline_ref_type(leaf, iref) != |
| 3004 | BTRFS_EXTENT_DATA_REF_KEY) |
| 3005 | goto out; |
| 3006 | |
| 3007 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 3008 | if (btrfs_extent_refs(leaf, ei) != |
| 3009 | btrfs_extent_data_ref_count(leaf, ref) || |
| 3010 | btrfs_extent_data_ref_root(leaf, ref) != |
| 3011 | root->root_key.objectid || |
| 3012 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || |
| 3013 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 3014 | goto out; |
| 3015 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3016 | ret = 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 3017 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3018 | return ret; |
| 3019 | } |
| 3020 | |
| 3021 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
| 3022 | struct btrfs_root *root, |
| 3023 | u64 objectid, u64 offset, u64 bytenr) |
| 3024 | { |
| 3025 | struct btrfs_path *path; |
| 3026 | int ret; |
| 3027 | int ret2; |
| 3028 | |
| 3029 | path = btrfs_alloc_path(); |
| 3030 | if (!path) |
| 3031 | return -ENOENT; |
| 3032 | |
| 3033 | do { |
| 3034 | ret = check_committed_ref(trans, root, path, objectid, |
| 3035 | offset, bytenr); |
| 3036 | if (ret && ret != -ENOENT) |
| 3037 | goto out; |
| 3038 | |
| 3039 | ret2 = check_delayed_ref(trans, root, path, objectid, |
| 3040 | offset, bytenr); |
| 3041 | } while (ret2 == -EAGAIN); |
| 3042 | |
| 3043 | if (ret2 && ret2 != -ENOENT) { |
| 3044 | ret = ret2; |
| 3045 | goto out; |
| 3046 | } |
| 3047 | |
| 3048 | if (ret != -ENOENT || ret2 != -ENOENT) |
| 3049 | ret = 0; |
| 3050 | out: |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3051 | btrfs_free_path(path); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3052 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 3053 | WARN_ON(ret > 0); |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3054 | return ret; |
| 3055 | } |
| 3056 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3057 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3058 | struct btrfs_root *root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3059 | struct extent_buffer *buf, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3060 | int full_backref, int inc, int no_quota) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3061 | { |
| 3062 | u64 bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3063 | u64 num_bytes; |
| 3064 | u64 parent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3065 | u64 ref_root; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3066 | u32 nritems; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3067 | struct btrfs_key key; |
| 3068 | struct btrfs_file_extent_item *fi; |
| 3069 | int i; |
| 3070 | int level; |
| 3071 | int ret = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3072 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3073 | u64, u64, u64, u64, u64, u64, int); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3074 | |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 3075 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| 3076 | if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) |
| 3077 | return 0; |
| 3078 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3079 | ref_root = btrfs_header_owner(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3080 | nritems = btrfs_header_nritems(buf); |
| 3081 | level = btrfs_header_level(buf); |
| 3082 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 3083 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3084 | return 0; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3085 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3086 | if (inc) |
| 3087 | process_func = btrfs_inc_extent_ref; |
| 3088 | else |
| 3089 | process_func = btrfs_free_extent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3090 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3091 | if (full_backref) |
| 3092 | parent = buf->start; |
| 3093 | else |
| 3094 | parent = 0; |
| 3095 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3096 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3097 | if (level == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3098 | btrfs_item_key_to_cpu(buf, &key, i); |
| 3099 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3100 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3101 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3102 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3103 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3104 | BTRFS_FILE_EXTENT_INLINE) |
| 3105 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3106 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 3107 | if (bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3108 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3109 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3110 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); |
| 3111 | key.offset -= btrfs_file_extent_offset(buf, fi); |
| 3112 | ret = process_func(trans, root, bytenr, num_bytes, |
| 3113 | parent, ref_root, key.objectid, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3114 | key.offset, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3115 | if (ret) |
| 3116 | goto fail; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3117 | } else { |
| 3118 | bytenr = btrfs_node_blockptr(buf, i); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3119 | num_bytes = btrfs_level_size(root, level - 1); |
| 3120 | ret = process_func(trans, root, bytenr, num_bytes, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3121 | parent, ref_root, level - 1, 0, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3122 | no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3123 | if (ret) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3124 | goto fail; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3125 | } |
| 3126 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3127 | return 0; |
| 3128 | fail: |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3129 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 3130 | } |
| 3131 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3132 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3133 | struct extent_buffer *buf, int full_backref, int no_quota) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3134 | { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3135 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3136 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3137 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3138 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3139 | struct extent_buffer *buf, int full_backref, int no_quota) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3140 | { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3141 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, no_quota); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3142 | } |
| 3143 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3144 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 3145 | struct btrfs_root *root, |
| 3146 | struct btrfs_path *path, |
| 3147 | struct btrfs_block_group_cache *cache) |
| 3148 | { |
| 3149 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3150 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3151 | unsigned long bi; |
| 3152 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3153 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3154 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3155 | if (ret < 0) |
| 3156 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3157 | BUG_ON(ret); /* Corruption */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3158 | |
| 3159 | leaf = path->nodes[0]; |
| 3160 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 3161 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 3162 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3163 | btrfs_release_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3164 | fail: |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3165 | if (ret) { |
| 3166 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3167 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3168 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3169 | return 0; |
| 3170 | |
| 3171 | } |
| 3172 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3173 | static struct btrfs_block_group_cache * |
| 3174 | next_block_group(struct btrfs_root *root, |
| 3175 | struct btrfs_block_group_cache *cache) |
| 3176 | { |
| 3177 | struct rb_node *node; |
| 3178 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 3179 | node = rb_next(&cache->cache_node); |
| 3180 | btrfs_put_block_group(cache); |
| 3181 | if (node) { |
| 3182 | cache = rb_entry(node, struct btrfs_block_group_cache, |
| 3183 | cache_node); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 3184 | btrfs_get_block_group(cache); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3185 | } else |
| 3186 | cache = NULL; |
| 3187 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 3188 | return cache; |
| 3189 | } |
| 3190 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3191 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
| 3192 | struct btrfs_trans_handle *trans, |
| 3193 | struct btrfs_path *path) |
| 3194 | { |
| 3195 | struct btrfs_root *root = block_group->fs_info->tree_root; |
| 3196 | struct inode *inode = NULL; |
| 3197 | u64 alloc_hint = 0; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3198 | int dcs = BTRFS_DC_ERROR; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3199 | int num_pages = 0; |
| 3200 | int retries = 0; |
| 3201 | int ret = 0; |
| 3202 | |
| 3203 | /* |
| 3204 | * If this block group is smaller than 100 megs don't bother caching the |
| 3205 | * block group. |
| 3206 | */ |
| 3207 | if (block_group->key.offset < (100 * 1024 * 1024)) { |
| 3208 | spin_lock(&block_group->lock); |
| 3209 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 3210 | spin_unlock(&block_group->lock); |
| 3211 | return 0; |
| 3212 | } |
| 3213 | |
| 3214 | again: |
| 3215 | inode = lookup_free_space_inode(root, block_group, path); |
| 3216 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { |
| 3217 | ret = PTR_ERR(inode); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3218 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3219 | goto out; |
| 3220 | } |
| 3221 | |
| 3222 | if (IS_ERR(inode)) { |
| 3223 | BUG_ON(retries); |
| 3224 | retries++; |
| 3225 | |
| 3226 | if (block_group->ro) |
| 3227 | goto out_free; |
| 3228 | |
| 3229 | ret = create_free_space_inode(root, trans, block_group, path); |
| 3230 | if (ret) |
| 3231 | goto out_free; |
| 3232 | goto again; |
| 3233 | } |
| 3234 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3235 | /* We've already setup this transaction, go ahead and exit */ |
| 3236 | if (block_group->cache_generation == trans->transid && |
| 3237 | i_size_read(inode)) { |
| 3238 | dcs = BTRFS_DC_SETUP; |
| 3239 | goto out_put; |
| 3240 | } |
| 3241 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3242 | /* |
| 3243 | * We want to set the generation to 0, that way if anything goes wrong |
| 3244 | * from here on out we know not to trust this cache when we load up next |
| 3245 | * time. |
| 3246 | */ |
| 3247 | BTRFS_I(inode)->generation = 0; |
| 3248 | ret = btrfs_update_inode(trans, root, inode); |
| 3249 | WARN_ON(ret); |
| 3250 | |
| 3251 | if (i_size_read(inode) > 0) { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 3252 | ret = btrfs_check_trunc_cache_free_space(root, |
| 3253 | &root->fs_info->global_block_rsv); |
| 3254 | if (ret) |
| 3255 | goto out_put; |
| 3256 | |
Filipe David Borba Manana | 7451432 | 2013-09-20 14:46:51 +0100 | [diff] [blame] | 3257 | ret = btrfs_truncate_free_space_cache(root, trans, inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3258 | if (ret) |
| 3259 | goto out_put; |
| 3260 | } |
| 3261 | |
| 3262 | spin_lock(&block_group->lock); |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 3263 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 3264 | !btrfs_test_opt(root, SPACE_CACHE) || |
| 3265 | block_group->delalloc_bytes) { |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 3266 | /* |
| 3267 | * don't bother trying to write stuff out _if_ |
| 3268 | * a) we're not cached, |
| 3269 | * b) we're with nospace_cache mount option. |
| 3270 | */ |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3271 | dcs = BTRFS_DC_WRITTEN; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3272 | spin_unlock(&block_group->lock); |
| 3273 | goto out_put; |
| 3274 | } |
| 3275 | spin_unlock(&block_group->lock); |
| 3276 | |
Josef Bacik | 6fc823b | 2012-08-06 13:46:38 -0600 | [diff] [blame] | 3277 | /* |
| 3278 | * Try to preallocate enough space based on how big the block group is. |
| 3279 | * Keep in mind this has to include any pinned space which could end up |
| 3280 | * taking up quite a bit since it's not folded into the other space |
| 3281 | * cache. |
| 3282 | */ |
| 3283 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3284 | if (!num_pages) |
| 3285 | num_pages = 1; |
| 3286 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3287 | num_pages *= 16; |
| 3288 | num_pages *= PAGE_CACHE_SIZE; |
| 3289 | |
| 3290 | ret = btrfs_check_data_free_space(inode, num_pages); |
| 3291 | if (ret) |
| 3292 | goto out_put; |
| 3293 | |
| 3294 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, |
| 3295 | num_pages, num_pages, |
| 3296 | &alloc_hint); |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3297 | if (!ret) |
| 3298 | dcs = BTRFS_DC_SETUP; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3299 | btrfs_free_reserved_data_space(inode, num_pages); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3300 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3301 | out_put: |
| 3302 | iput(inode); |
| 3303 | out_free: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3304 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3305 | out: |
| 3306 | spin_lock(&block_group->lock); |
Josef Bacik | e65cbb9 | 2011-12-13 16:04:54 -0500 | [diff] [blame] | 3307 | if (!ret && dcs == BTRFS_DC_SETUP) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3308 | block_group->cache_generation = trans->transid; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3309 | block_group->disk_cache_state = dcs; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3310 | spin_unlock(&block_group->lock); |
| 3311 | |
| 3312 | return ret; |
| 3313 | } |
| 3314 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3315 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 3316 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3317 | { |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3318 | struct btrfs_block_group_cache *cache; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3319 | int err = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3320 | struct btrfs_path *path; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3321 | u64 last = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3322 | |
| 3323 | path = btrfs_alloc_path(); |
| 3324 | if (!path) |
| 3325 | return -ENOMEM; |
| 3326 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3327 | again: |
| 3328 | while (1) { |
| 3329 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3330 | while (cache) { |
| 3331 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) |
| 3332 | break; |
| 3333 | cache = next_block_group(root, cache); |
| 3334 | } |
| 3335 | if (!cache) { |
| 3336 | if (last == 0) |
| 3337 | break; |
| 3338 | last = 0; |
| 3339 | continue; |
| 3340 | } |
| 3341 | err = cache_save_setup(cache, trans, path); |
| 3342 | last = cache->key.objectid + cache->key.offset; |
| 3343 | btrfs_put_block_group(cache); |
| 3344 | } |
| 3345 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3346 | while (1) { |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3347 | if (last == 0) { |
| 3348 | err = btrfs_run_delayed_refs(trans, root, |
| 3349 | (unsigned long)-1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3350 | if (err) /* File system offline */ |
| 3351 | goto out; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3352 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3353 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3354 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3355 | while (cache) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3356 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
| 3357 | btrfs_put_block_group(cache); |
| 3358 | goto again; |
| 3359 | } |
| 3360 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3361 | if (cache->dirty) |
| 3362 | break; |
| 3363 | cache = next_block_group(root, cache); |
| 3364 | } |
| 3365 | if (!cache) { |
| 3366 | if (last == 0) |
| 3367 | break; |
| 3368 | last = 0; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3369 | continue; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3370 | } |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3371 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3372 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
| 3373 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3374 | cache->dirty = 0; |
| 3375 | last = cache->key.objectid + cache->key.offset; |
| 3376 | |
| 3377 | err = write_one_cache_group(trans, root, path, cache); |
Filipe David Borba Manana | e84cc14 | 2013-09-09 19:49:43 +0100 | [diff] [blame] | 3378 | btrfs_put_block_group(cache); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3379 | if (err) /* File system offline */ |
| 3380 | goto out; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3381 | } |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3382 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3383 | while (1) { |
| 3384 | /* |
| 3385 | * I don't think this is needed since we're just marking our |
| 3386 | * preallocated extent as written, but just in case it can't |
| 3387 | * hurt. |
| 3388 | */ |
| 3389 | if (last == 0) { |
| 3390 | err = btrfs_run_delayed_refs(trans, root, |
| 3391 | (unsigned long)-1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3392 | if (err) /* File system offline */ |
| 3393 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3394 | } |
| 3395 | |
| 3396 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3397 | while (cache) { |
| 3398 | /* |
| 3399 | * Really this shouldn't happen, but it could if we |
| 3400 | * couldn't write the entire preallocated extent and |
| 3401 | * splitting the extent resulted in a new block. |
| 3402 | */ |
| 3403 | if (cache->dirty) { |
| 3404 | btrfs_put_block_group(cache); |
| 3405 | goto again; |
| 3406 | } |
| 3407 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
| 3408 | break; |
| 3409 | cache = next_block_group(root, cache); |
| 3410 | } |
| 3411 | if (!cache) { |
| 3412 | if (last == 0) |
| 3413 | break; |
| 3414 | last = 0; |
| 3415 | continue; |
| 3416 | } |
| 3417 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3418 | err = btrfs_write_out_cache(root, trans, cache, path); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3419 | |
| 3420 | /* |
| 3421 | * If we didn't have an error then the cache state is still |
| 3422 | * NEED_WRITE, so we can set it to WRITTEN. |
| 3423 | */ |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3424 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3425 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
| 3426 | last = cache->key.objectid + cache->key.offset; |
| 3427 | btrfs_put_block_group(cache); |
| 3428 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3429 | out: |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3430 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3431 | btrfs_free_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3432 | return err; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3433 | } |
| 3434 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3435 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
| 3436 | { |
| 3437 | struct btrfs_block_group_cache *block_group; |
| 3438 | int readonly = 0; |
| 3439 | |
| 3440 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
| 3441 | if (!block_group || block_group->ro) |
| 3442 | readonly = 1; |
| 3443 | if (block_group) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3444 | btrfs_put_block_group(block_group); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3445 | return readonly; |
| 3446 | } |
| 3447 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3448 | static const char *alloc_name(u64 flags) |
| 3449 | { |
| 3450 | switch (flags) { |
| 3451 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: |
| 3452 | return "mixed"; |
| 3453 | case BTRFS_BLOCK_GROUP_METADATA: |
| 3454 | return "metadata"; |
| 3455 | case BTRFS_BLOCK_GROUP_DATA: |
| 3456 | return "data"; |
| 3457 | case BTRFS_BLOCK_GROUP_SYSTEM: |
| 3458 | return "system"; |
| 3459 | default: |
| 3460 | WARN_ON(1); |
| 3461 | return "invalid-combination"; |
| 3462 | }; |
| 3463 | } |
| 3464 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3465 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 3466 | u64 total_bytes, u64 bytes_used, |
| 3467 | struct btrfs_space_info **space_info) |
| 3468 | { |
| 3469 | struct btrfs_space_info *found; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3470 | int i; |
| 3471 | int factor; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3472 | int ret; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3473 | |
| 3474 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | |
| 3475 | BTRFS_BLOCK_GROUP_RAID10)) |
| 3476 | factor = 2; |
| 3477 | else |
| 3478 | factor = 1; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3479 | |
| 3480 | found = __find_space_info(info, flags); |
| 3481 | if (found) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3482 | spin_lock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3483 | found->total_bytes += total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3484 | found->disk_total += total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3485 | found->bytes_used += bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3486 | found->disk_used += bytes_used * factor; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3487 | found->full = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3488 | spin_unlock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3489 | *space_info = found; |
| 3490 | return 0; |
| 3491 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3492 | found = kzalloc(sizeof(*found), GFP_NOFS); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3493 | if (!found) |
| 3494 | return -ENOMEM; |
| 3495 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3496 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
| 3497 | if (ret) { |
| 3498 | kfree(found); |
| 3499 | return ret; |
| 3500 | } |
| 3501 | |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 3502 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3503 | INIT_LIST_HEAD(&found->block_groups[i]); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3504 | init_rwsem(&found->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3505 | spin_lock_init(&found->lock); |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3506 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3507 | found->total_bytes = total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3508 | found->disk_total = total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3509 | found->bytes_used = bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3510 | found->disk_used = bytes_used * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3511 | found->bytes_pinned = 0; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3512 | found->bytes_reserved = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3513 | found->bytes_readonly = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3514 | found->bytes_may_use = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3515 | found->full = 0; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3516 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3517 | found->chunk_alloc = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 3518 | found->flush = 0; |
| 3519 | init_waitqueue_head(&found->wait); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3520 | |
| 3521 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, |
| 3522 | info->space_info_kobj, "%s", |
| 3523 | alloc_name(found->flags)); |
| 3524 | if (ret) { |
| 3525 | kfree(found); |
| 3526 | return ret; |
| 3527 | } |
| 3528 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3529 | *space_info = found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 3530 | list_add_rcu(&found->list, &info->space_info); |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3531 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3532 | info->data_sinfo = found; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 3533 | |
| 3534 | return ret; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3535 | } |
| 3536 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3537 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 3538 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 3539 | u64 extra_flags = chunk_to_extended(flags) & |
| 3540 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3541 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3542 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3543 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3544 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 3545 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3546 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 3547 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3548 | fs_info->avail_system_alloc_bits |= extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3549 | write_sequnlock(&fs_info->profiles_lock); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3550 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3551 | |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3552 | /* |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3553 | * returns target flags in extended format or 0 if restripe for this |
| 3554 | * chunk_type is not in progress |
Ilya Dryomov | c6664b4 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 3555 | * |
| 3556 | * should be called with either volume_mutex or balance_lock held |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3557 | */ |
| 3558 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) |
| 3559 | { |
| 3560 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
| 3561 | u64 target = 0; |
| 3562 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3563 | if (!bctl) |
| 3564 | return 0; |
| 3565 | |
| 3566 | if (flags & BTRFS_BLOCK_GROUP_DATA && |
| 3567 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3568 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; |
| 3569 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && |
| 3570 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3571 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; |
| 3572 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && |
| 3573 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3574 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; |
| 3575 | } |
| 3576 | |
| 3577 | return target; |
| 3578 | } |
| 3579 | |
| 3580 | /* |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3581 | * @flags: available profiles in extended format (see ctree.h) |
| 3582 | * |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3583 | * Returns reduced profile in chunk format. If profile changing is in |
| 3584 | * progress (either running or paused) picks the target profile (if it's |
| 3585 | * already available), otherwise falls back to plain reducing. |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3586 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 3587 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3588 | { |
Chris Mason | cd02dca | 2010-12-13 14:56:23 -0500 | [diff] [blame] | 3589 | /* |
| 3590 | * we add in the count of missing devices because we want |
| 3591 | * to make sure that any RAID levels on a degraded FS |
| 3592 | * continue to be honored. |
| 3593 | */ |
| 3594 | u64 num_devices = root->fs_info->fs_devices->rw_devices + |
| 3595 | root->fs_info->fs_devices->missing_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3596 | u64 target; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3597 | u64 tmp; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3598 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3599 | /* |
| 3600 | * see if restripe for this chunk_type is in progress, if so |
| 3601 | * try to reduce to the target profile |
| 3602 | */ |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3603 | spin_lock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3604 | target = get_restripe_target(root->fs_info, flags); |
| 3605 | if (target) { |
| 3606 | /* pick target profile only if it's already available */ |
| 3607 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3608 | spin_unlock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3609 | return extended_to_chunk(target); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3610 | } |
| 3611 | } |
| 3612 | spin_unlock(&root->fs_info->balance_lock); |
| 3613 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3614 | /* First, mask out the RAID levels which aren't possible */ |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3615 | if (num_devices == 1) |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3616 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
| 3617 | BTRFS_BLOCK_GROUP_RAID5); |
| 3618 | if (num_devices < 3) |
| 3619 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3620 | if (num_devices < 4) |
| 3621 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 3622 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3623 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
| 3624 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | |
| 3625 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); |
| 3626 | flags &= ~tmp; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3627 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3628 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
| 3629 | tmp = BTRFS_BLOCK_GROUP_RAID6; |
| 3630 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) |
| 3631 | tmp = BTRFS_BLOCK_GROUP_RAID5; |
| 3632 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) |
| 3633 | tmp = BTRFS_BLOCK_GROUP_RAID10; |
| 3634 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) |
| 3635 | tmp = BTRFS_BLOCK_GROUP_RAID1; |
| 3636 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) |
| 3637 | tmp = BTRFS_BLOCK_GROUP_RAID0; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3638 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3639 | return extended_to_chunk(flags | tmp); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3640 | } |
| 3641 | |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3642 | static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3643 | { |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3644 | unsigned seq; |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3645 | u64 flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3646 | |
| 3647 | do { |
Filipe Manana | f8213bd | 2014-04-24 15:15:29 +0100 | [diff] [blame] | 3648 | flags = orig_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3649 | seq = read_seqbegin(&root->fs_info->profiles_lock); |
| 3650 | |
| 3651 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3652 | flags |= root->fs_info->avail_data_alloc_bits; |
| 3653 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3654 | flags |= root->fs_info->avail_system_alloc_bits; |
| 3655 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3656 | flags |= root->fs_info->avail_metadata_alloc_bits; |
| 3657 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); |
Ilya Dryomov | 6fef8df | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3658 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3659 | return btrfs_reduce_alloc_profile(root, flags); |
| 3660 | } |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3661 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 3662 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3663 | { |
| 3664 | u64 flags; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3665 | u64 ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3666 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3667 | if (data) |
| 3668 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 3669 | else if (root == root->fs_info->chunk_root) |
| 3670 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 3671 | else |
| 3672 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 3673 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3674 | ret = get_alloc_profile(root, flags); |
| 3675 | return ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3676 | } |
| 3677 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3678 | /* |
| 3679 | * This will check the space that the inode allocates from to make sure we have |
| 3680 | * enough space for bytes. |
| 3681 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3682 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3683 | { |
| 3684 | struct btrfs_space_info *data_sinfo; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3685 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3686 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3687 | u64 used; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3688 | int ret = 0, committed = 0, alloc_chunk = 1; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3689 | |
| 3690 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3691 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3692 | |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3693 | if (btrfs_is_free_space_inode(inode)) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3694 | committed = 1; |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3695 | ASSERT(current->journal_info); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3696 | } |
| 3697 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3698 | data_sinfo = fs_info->data_sinfo; |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3699 | if (!data_sinfo) |
| 3700 | goto alloc; |
| 3701 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3702 | again: |
| 3703 | /* make sure we have enough space to handle the data first */ |
| 3704 | spin_lock(&data_sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3705 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
| 3706 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + |
| 3707 | data_sinfo->bytes_may_use; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3708 | |
| 3709 | if (used + bytes > data_sinfo->total_bytes) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3710 | struct btrfs_trans_handle *trans; |
| 3711 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3712 | /* |
| 3713 | * if we don't have enough free bytes in this space then we need |
| 3714 | * to alloc a new chunk. |
| 3715 | */ |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3716 | if (!data_sinfo->full && alloc_chunk) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3717 | u64 alloc_target; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3718 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3719 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3720 | spin_unlock(&data_sinfo->lock); |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3721 | alloc: |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3722 | alloc_target = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 9dced18 | 2013-10-25 17:33:36 +0800 | [diff] [blame] | 3723 | /* |
| 3724 | * It is ugly that we don't call nolock join |
| 3725 | * transaction for the free space inode case here. |
| 3726 | * But it is safe because we only do the data space |
| 3727 | * reservation for the free space cache in the |
| 3728 | * transaction context, the common join transaction |
| 3729 | * just increase the counter of the current transaction |
| 3730 | * handler, doesn't try to acquire the trans_lock of |
| 3731 | * the fs. |
| 3732 | */ |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3733 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3734 | if (IS_ERR(trans)) |
| 3735 | return PTR_ERR(trans); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3736 | |
| 3737 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3738 | alloc_target, |
| 3739 | CHUNK_ALLOC_NO_FORCE); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3740 | btrfs_end_transaction(trans, root); |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3741 | if (ret < 0) { |
| 3742 | if (ret != -ENOSPC) |
| 3743 | return ret; |
| 3744 | else |
| 3745 | goto commit_trans; |
| 3746 | } |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3747 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3748 | if (!data_sinfo) |
| 3749 | data_sinfo = fs_info->data_sinfo; |
| 3750 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3751 | goto again; |
| 3752 | } |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3753 | |
| 3754 | /* |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3755 | * If we don't have enough pinned space to deal with this |
| 3756 | * allocation don't bother committing the transaction. |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3757 | */ |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3758 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
| 3759 | bytes) < 0) |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3760 | committed = 1; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3761 | spin_unlock(&data_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3762 | |
| 3763 | /* commit the current transaction and try again */ |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3764 | commit_trans: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3765 | if (!committed && |
| 3766 | !atomic_read(&root->fs_info->open_ioctl_trans)) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3767 | committed = 1; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3768 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3769 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3770 | if (IS_ERR(trans)) |
| 3771 | return PTR_ERR(trans); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3772 | ret = btrfs_commit_transaction(trans, root); |
| 3773 | if (ret) |
| 3774 | return ret; |
| 3775 | goto again; |
| 3776 | } |
| 3777 | |
Jeff Mahoney | cab45e2 | 2013-10-16 16:27:01 -0400 | [diff] [blame] | 3778 | trace_btrfs_space_reservation(root->fs_info, |
| 3779 | "space_info:enospc", |
| 3780 | data_sinfo->flags, bytes, 1); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3781 | return -ENOSPC; |
| 3782 | } |
| 3783 | data_sinfo->bytes_may_use += bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3784 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3785 | data_sinfo->flags, bytes, 1); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3786 | spin_unlock(&data_sinfo->lock); |
| 3787 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3788 | return 0; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3789 | } |
| 3790 | |
| 3791 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3792 | * Called if we need to clear a data reservation for this inode. |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3793 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3794 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3795 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3796 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3797 | struct btrfs_space_info *data_sinfo; |
| 3798 | |
| 3799 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3800 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3801 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3802 | data_sinfo = root->fs_info->data_sinfo; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3803 | spin_lock(&data_sinfo->lock); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 3804 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3805 | data_sinfo->bytes_may_use -= bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3806 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3807 | data_sinfo->flags, bytes, 0); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3808 | spin_unlock(&data_sinfo->lock); |
| 3809 | } |
| 3810 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3811 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
| 3812 | { |
| 3813 | struct list_head *head = &info->space_info; |
| 3814 | struct btrfs_space_info *found; |
| 3815 | |
| 3816 | rcu_read_lock(); |
| 3817 | list_for_each_entry_rcu(found, head, list) { |
| 3818 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3819 | found->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3820 | } |
| 3821 | rcu_read_unlock(); |
| 3822 | } |
| 3823 | |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3824 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
| 3825 | { |
| 3826 | return (global->size << 1); |
| 3827 | } |
| 3828 | |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 3829 | static int should_alloc_chunk(struct btrfs_root *root, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3830 | struct btrfs_space_info *sinfo, int force) |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3831 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3832 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3833 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3834 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 3835 | u64 thresh; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3836 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3837 | if (force == CHUNK_ALLOC_FORCE) |
| 3838 | return 1; |
| 3839 | |
| 3840 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3841 | * We need to take into account the global rsv because for all intents |
| 3842 | * and purposes it's used space. Don't worry about locking the |
| 3843 | * global_rsv, it doesn't change except when the transaction commits. |
| 3844 | */ |
Josef Bacik | 54338b5 | 2012-08-14 16:20:52 -0400 | [diff] [blame] | 3845 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3846 | num_allocated += calc_global_rsv_need_space(global_rsv); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3847 | |
| 3848 | /* |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3849 | * in limited mode, we want to have some free space up to |
| 3850 | * about 1% of the FS size. |
| 3851 | */ |
| 3852 | if (force == CHUNK_ALLOC_LIMITED) { |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 3853 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3854 | thresh = max_t(u64, 64 * 1024 * 1024, |
| 3855 | div_factor_fine(thresh, 1)); |
| 3856 | |
| 3857 | if (num_bytes - num_allocated < thresh) |
| 3858 | return 1; |
| 3859 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3860 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3861 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
Josef Bacik | 14ed0ca | 2010-10-15 15:23:48 -0400 | [diff] [blame] | 3862 | return 0; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3863 | return 1; |
| 3864 | } |
| 3865 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3866 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
| 3867 | { |
| 3868 | u64 num_dev; |
| 3869 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3870 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
| 3871 | BTRFS_BLOCK_GROUP_RAID0 | |
| 3872 | BTRFS_BLOCK_GROUP_RAID5 | |
| 3873 | BTRFS_BLOCK_GROUP_RAID6)) |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3874 | num_dev = root->fs_info->fs_devices->rw_devices; |
| 3875 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
| 3876 | num_dev = 2; |
| 3877 | else |
| 3878 | num_dev = 1; /* DUP or single */ |
| 3879 | |
| 3880 | /* metadata for updaing devices and chunk tree */ |
| 3881 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); |
| 3882 | } |
| 3883 | |
| 3884 | static void check_system_chunk(struct btrfs_trans_handle *trans, |
| 3885 | struct btrfs_root *root, u64 type) |
| 3886 | { |
| 3887 | struct btrfs_space_info *info; |
| 3888 | u64 left; |
| 3889 | u64 thresh; |
| 3890 | |
| 3891 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 3892 | spin_lock(&info->lock); |
| 3893 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 3894 | info->bytes_reserved - info->bytes_readonly; |
| 3895 | spin_unlock(&info->lock); |
| 3896 | |
| 3897 | thresh = get_system_chunk_thresh(root, type); |
| 3898 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3899 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
| 3900 | left, thresh, type); |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3901 | dump_space_info(info, 0, 0); |
| 3902 | } |
| 3903 | |
| 3904 | if (left < thresh) { |
| 3905 | u64 flags; |
| 3906 | |
| 3907 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); |
| 3908 | btrfs_alloc_chunk(trans, root, flags); |
| 3909 | } |
| 3910 | } |
| 3911 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3912 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3913 | struct btrfs_root *extent_root, u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3914 | { |
| 3915 | struct btrfs_space_info *space_info; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3916 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3917 | int wait_for_alloc = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3918 | int ret = 0; |
| 3919 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3920 | /* Don't re-enter if we're already allocating a chunk */ |
| 3921 | if (trans->allocating_chunk) |
| 3922 | return -ENOSPC; |
| 3923 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3924 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3925 | if (!space_info) { |
| 3926 | ret = update_space_info(extent_root->fs_info, flags, |
| 3927 | 0, 0, &space_info); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3928 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3929 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3930 | BUG_ON(!space_info); /* Logic error */ |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3931 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3932 | again: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3933 | spin_lock(&space_info->lock); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 3934 | if (force < space_info->force_alloc) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3935 | force = space_info->force_alloc; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3936 | if (space_info->full) { |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 3937 | if (should_alloc_chunk(extent_root, space_info, force)) |
| 3938 | ret = -ENOSPC; |
| 3939 | else |
| 3940 | ret = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3941 | spin_unlock(&space_info->lock); |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 3942 | return ret; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3943 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3944 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3945 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3946 | spin_unlock(&space_info->lock); |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3947 | return 0; |
| 3948 | } else if (space_info->chunk_alloc) { |
| 3949 | wait_for_alloc = 1; |
| 3950 | } else { |
| 3951 | space_info->chunk_alloc = 1; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3952 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3953 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3954 | spin_unlock(&space_info->lock); |
| 3955 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3956 | mutex_lock(&fs_info->chunk_mutex); |
| 3957 | |
| 3958 | /* |
| 3959 | * The chunk_mutex is held throughout the entirety of a chunk |
| 3960 | * allocation, so once we've acquired the chunk_mutex we know that the |
| 3961 | * other guy is done and we need to recheck and see if we should |
| 3962 | * allocate. |
| 3963 | */ |
| 3964 | if (wait_for_alloc) { |
| 3965 | mutex_unlock(&fs_info->chunk_mutex); |
| 3966 | wait_for_alloc = 0; |
| 3967 | goto again; |
| 3968 | } |
| 3969 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3970 | trans->allocating_chunk = true; |
| 3971 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3972 | /* |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 3973 | * If we have mixed data/metadata chunks we want to make sure we keep |
| 3974 | * allocating mixed chunks instead of individual chunks. |
| 3975 | */ |
| 3976 | if (btrfs_mixed_space_info(space_info)) |
| 3977 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); |
| 3978 | |
| 3979 | /* |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3980 | * if we're doing a data chunk, go ahead and make sure that |
| 3981 | * we keep a reasonable number of metadata chunks allocated in the |
| 3982 | * FS as well. |
| 3983 | */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3984 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3985 | fs_info->data_chunk_allocations++; |
| 3986 | if (!(fs_info->data_chunk_allocations % |
| 3987 | fs_info->metadata_ratio)) |
| 3988 | force_metadata_allocation(fs_info); |
| 3989 | } |
| 3990 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3991 | /* |
| 3992 | * Check if we have enough space in SYSTEM chunk because we may need |
| 3993 | * to update devices. |
| 3994 | */ |
| 3995 | check_system_chunk(trans, extent_root, flags); |
| 3996 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3997 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3998 | trans->allocating_chunk = false; |
Mark Fasheh | 92b8e897 | 2011-07-12 10:57:59 -0700 | [diff] [blame] | 3999 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4000 | spin_lock(&space_info->lock); |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 4001 | if (ret < 0 && ret != -ENOSPC) |
| 4002 | goto out; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4003 | if (ret) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4004 | space_info->full = 1; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4005 | else |
| 4006 | ret = 1; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4007 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 4008 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 4009 | out: |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 4010 | space_info->chunk_alloc = 0; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4011 | spin_unlock(&space_info->lock); |
Dan Carpenter | a25c75d | 2012-04-18 09:59:29 +0300 | [diff] [blame] | 4012 | mutex_unlock(&fs_info->chunk_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 4013 | return ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 4014 | } |
| 4015 | |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4016 | static int can_overcommit(struct btrfs_root *root, |
| 4017 | struct btrfs_space_info *space_info, u64 bytes, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4018 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4019 | { |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4020 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4021 | u64 profile = btrfs_get_alloc_profile(root, 0); |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4022 | u64 space_size; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4023 | u64 avail; |
| 4024 | u64 used; |
| 4025 | |
| 4026 | used = space_info->bytes_used + space_info->bytes_reserved + |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4027 | space_info->bytes_pinned + space_info->bytes_readonly; |
| 4028 | |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4029 | /* |
| 4030 | * We only want to allow over committing if we have lots of actual space |
| 4031 | * free, but if we don't have enough space to handle the global reserve |
| 4032 | * space then we could end up having a real enospc problem when trying |
| 4033 | * to allocate a chunk or some other such important allocation. |
| 4034 | */ |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 4035 | spin_lock(&global_rsv->lock); |
| 4036 | space_size = calc_global_rsv_need_space(global_rsv); |
| 4037 | spin_unlock(&global_rsv->lock); |
| 4038 | if (used + space_size >= space_info->total_bytes) |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 4039 | return 0; |
| 4040 | |
| 4041 | used += space_info->bytes_may_use; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4042 | |
| 4043 | spin_lock(&root->fs_info->free_chunk_lock); |
| 4044 | avail = root->fs_info->free_chunk_space; |
| 4045 | spin_unlock(&root->fs_info->free_chunk_lock); |
| 4046 | |
| 4047 | /* |
| 4048 | * 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] | 4049 | * space is actually useable. For raid56, the space info used |
| 4050 | * doesn't include the parity drive, so we don't have to |
| 4051 | * change the math |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4052 | */ |
| 4053 | if (profile & (BTRFS_BLOCK_GROUP_DUP | |
| 4054 | BTRFS_BLOCK_GROUP_RAID1 | |
| 4055 | BTRFS_BLOCK_GROUP_RAID10)) |
| 4056 | avail >>= 1; |
| 4057 | |
| 4058 | /* |
Miao Xie | 561c294 | 2012-10-16 11:32:18 +0000 | [diff] [blame] | 4059 | * If we aren't flushing all things, let us overcommit up to |
| 4060 | * 1/2th of the space. If we can flush, don't let us overcommit |
| 4061 | * too much, let it overcommit up to 1/8 of the space. |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4062 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4063 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4064 | avail >>= 3; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4065 | else |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4066 | avail >>= 1; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4067 | |
Josef Bacik | 14575ae | 2013-09-17 10:48:00 -0400 | [diff] [blame] | 4068 | if (used + bytes < space_info->total_bytes + avail) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 4069 | return 1; |
| 4070 | return 0; |
| 4071 | } |
| 4072 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 4073 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4074 | unsigned long nr_pages, int nr_items) |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4075 | { |
| 4076 | struct super_block *sb = root->fs_info->sb; |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4077 | |
Josef Bacik | 925a6ef | 2013-06-20 12:31:27 -0400 | [diff] [blame] | 4078 | if (down_read_trylock(&sb->s_umount)) { |
| 4079 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); |
| 4080 | up_read(&sb->s_umount); |
| 4081 | } else { |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4082 | /* |
| 4083 | * We needn't worry the filesystem going from r/w to r/o though |
| 4084 | * we don't acquire ->s_umount mutex, because the filesystem |
| 4085 | * should guarantee the delalloc inodes list be empty after |
| 4086 | * the filesystem is readonly(all dirty pages are written to |
| 4087 | * the disk). |
| 4088 | */ |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4089 | btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); |
Josef Bacik | 98ad69c | 2013-04-04 11:55:49 -0400 | [diff] [blame] | 4090 | if (!current->journal_info) |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4091 | btrfs_wait_ordered_roots(root->fs_info, nr_items); |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4092 | } |
| 4093 | } |
| 4094 | |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4095 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) |
| 4096 | { |
| 4097 | u64 bytes; |
| 4098 | int nr; |
| 4099 | |
| 4100 | bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 4101 | nr = (int)div64_u64(to_reclaim, bytes); |
| 4102 | if (!nr) |
| 4103 | nr = 1; |
| 4104 | return nr; |
| 4105 | } |
| 4106 | |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4107 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) |
| 4108 | |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4109 | /* |
| 4110 | * shrink metadata reservation for delalloc |
| 4111 | */ |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4112 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
| 4113 | bool wait_ordered) |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4114 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4115 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4116 | struct btrfs_space_info *space_info; |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4117 | struct btrfs_trans_handle *trans; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4118 | u64 delalloc_bytes; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4119 | u64 max_reclaim; |
Josef Bacik | b1953bc | 2011-01-21 21:10:01 +0000 | [diff] [blame] | 4120 | long time_left; |
Miao Xie | d3ee29e | 2013-11-04 23:13:20 +0800 | [diff] [blame] | 4121 | unsigned long nr_pages; |
| 4122 | int loops; |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4123 | int items; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4124 | enum btrfs_reserve_flush_enum flush; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4125 | |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4126 | /* Calc the number of the pages we need flush for space reservation */ |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4127 | items = calc_reclaim_items_nr(root, to_reclaim); |
| 4128 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; |
Miao Xie | c61a16a | 2013-11-04 23:13:23 +0800 | [diff] [blame] | 4129 | |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4130 | trans = (struct btrfs_trans_handle *)current->journal_info; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4131 | block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4132 | space_info = block_rsv->space_info; |
Chris Mason | bf9022e | 2010-10-26 13:40:45 -0400 | [diff] [blame] | 4133 | |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4134 | delalloc_bytes = percpu_counter_sum_positive( |
| 4135 | &root->fs_info->delalloc_bytes); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4136 | if (delalloc_bytes == 0) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4137 | if (trans) |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4138 | return; |
Miao Xie | 38c135a | 2013-11-04 23:13:21 +0800 | [diff] [blame] | 4139 | if (wait_ordered) |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4140 | btrfs_wait_ordered_roots(root->fs_info, items); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4141 | return; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4142 | } |
| 4143 | |
Miao Xie | d3ee29e | 2013-11-04 23:13:20 +0800 | [diff] [blame] | 4144 | loops = 0; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4145 | while (delalloc_bytes && loops < 3) { |
| 4146 | max_reclaim = min(delalloc_bytes, to_reclaim); |
| 4147 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4148 | btrfs_writeback_inodes_sb_nr(root, nr_pages, items); |
Josef Bacik | dea31f5 | 2012-09-06 16:47:00 -0400 | [diff] [blame] | 4149 | /* |
| 4150 | * We need to wait for the async pages to actually start before |
| 4151 | * we do anything. |
| 4152 | */ |
Miao Xie | 9f3a074 | 2013-11-04 23:13:24 +0800 | [diff] [blame] | 4153 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); |
| 4154 | if (!max_reclaim) |
| 4155 | goto skip_async; |
Josef Bacik | dea31f5 | 2012-09-06 16:47:00 -0400 | [diff] [blame] | 4156 | |
Miao Xie | 9f3a074 | 2013-11-04 23:13:24 +0800 | [diff] [blame] | 4157 | if (max_reclaim <= nr_pages) |
| 4158 | max_reclaim = 0; |
| 4159 | else |
| 4160 | max_reclaim -= nr_pages; |
| 4161 | |
| 4162 | wait_event(root->fs_info->async_submit_wait, |
| 4163 | atomic_read(&root->fs_info->async_delalloc_pages) <= |
| 4164 | (int)max_reclaim); |
| 4165 | skip_async: |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4166 | if (!trans) |
| 4167 | flush = BTRFS_RESERVE_FLUSH_ALL; |
| 4168 | else |
| 4169 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4170 | spin_lock(&space_info->lock); |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4171 | if (can_overcommit(root, space_info, orig, flush)) { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4172 | spin_unlock(&space_info->lock); |
| 4173 | break; |
| 4174 | } |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4175 | spin_unlock(&space_info->lock); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4176 | |
Chris Mason | 36e39c4 | 2011-03-12 07:08:42 -0500 | [diff] [blame] | 4177 | loops++; |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4178 | if (wait_ordered && !trans) { |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 4179 | btrfs_wait_ordered_roots(root->fs_info, items); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4180 | } else { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4181 | time_left = schedule_timeout_killable(1); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4182 | if (time_left) |
| 4183 | break; |
| 4184 | } |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4185 | delalloc_bytes = percpu_counter_sum_positive( |
| 4186 | &root->fs_info->delalloc_bytes); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4187 | } |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4188 | } |
| 4189 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4190 | /** |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4191 | * maybe_commit_transaction - possibly commit the transaction if its ok to |
| 4192 | * @root - the root we're allocating for |
| 4193 | * @bytes - the number of bytes we want to reserve |
| 4194 | * @force - force the commit |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4195 | * |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4196 | * This will check to make sure that committing the transaction will actually |
| 4197 | * get us somewhere and then commit the transaction if it does. Otherwise it |
| 4198 | * will return -ENOSPC. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4199 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4200 | static int may_commit_transaction(struct btrfs_root *root, |
| 4201 | struct btrfs_space_info *space_info, |
| 4202 | u64 bytes, int force) |
| 4203 | { |
| 4204 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; |
| 4205 | struct btrfs_trans_handle *trans; |
| 4206 | |
| 4207 | trans = (struct btrfs_trans_handle *)current->journal_info; |
| 4208 | if (trans) |
| 4209 | return -EAGAIN; |
| 4210 | |
| 4211 | if (force) |
| 4212 | goto commit; |
| 4213 | |
| 4214 | /* See if there is enough pinned space to make this reservation */ |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4215 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
Miao Xie | 0424c54 | 2014-03-06 13:54:59 +0800 | [diff] [blame] | 4216 | bytes) >= 0) |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4217 | goto commit; |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4218 | |
| 4219 | /* |
| 4220 | * See if there is some space in the delayed insertion reservation for |
| 4221 | * this reservation. |
| 4222 | */ |
| 4223 | if (space_info != delayed_rsv->space_info) |
| 4224 | return -ENOSPC; |
| 4225 | |
| 4226 | spin_lock(&delayed_rsv->lock); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4227 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
| 4228 | bytes - delayed_rsv->size) >= 0) { |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4229 | spin_unlock(&delayed_rsv->lock); |
| 4230 | return -ENOSPC; |
| 4231 | } |
| 4232 | spin_unlock(&delayed_rsv->lock); |
| 4233 | |
| 4234 | commit: |
| 4235 | trans = btrfs_join_transaction(root); |
| 4236 | if (IS_ERR(trans)) |
| 4237 | return -ENOSPC; |
| 4238 | |
| 4239 | return btrfs_commit_transaction(trans, root); |
| 4240 | } |
| 4241 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4242 | enum flush_state { |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4243 | FLUSH_DELAYED_ITEMS_NR = 1, |
| 4244 | FLUSH_DELAYED_ITEMS = 2, |
| 4245 | FLUSH_DELALLOC = 3, |
| 4246 | FLUSH_DELALLOC_WAIT = 4, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4247 | ALLOC_CHUNK = 5, |
| 4248 | COMMIT_TRANS = 6, |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4249 | }; |
| 4250 | |
| 4251 | static int flush_space(struct btrfs_root *root, |
| 4252 | struct btrfs_space_info *space_info, u64 num_bytes, |
| 4253 | u64 orig_bytes, int state) |
| 4254 | { |
| 4255 | struct btrfs_trans_handle *trans; |
| 4256 | int nr; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4257 | int ret = 0; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4258 | |
| 4259 | switch (state) { |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4260 | case FLUSH_DELAYED_ITEMS_NR: |
| 4261 | case FLUSH_DELAYED_ITEMS: |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4262 | if (state == FLUSH_DELAYED_ITEMS_NR) |
| 4263 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; |
| 4264 | else |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4265 | nr = -1; |
Miao Xie | 18cd8ea | 2013-11-04 23:13:22 +0800 | [diff] [blame] | 4266 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4267 | trans = btrfs_join_transaction(root); |
| 4268 | if (IS_ERR(trans)) { |
| 4269 | ret = PTR_ERR(trans); |
| 4270 | break; |
| 4271 | } |
| 4272 | ret = btrfs_run_delayed_items_nr(trans, root, nr); |
| 4273 | btrfs_end_transaction(trans, root); |
| 4274 | break; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4275 | case FLUSH_DELALLOC: |
| 4276 | case FLUSH_DELALLOC_WAIT: |
Miao Xie | 24af7dd | 2014-03-06 13:55:00 +0800 | [diff] [blame] | 4277 | shrink_delalloc(root, num_bytes * 2, orig_bytes, |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4278 | state == FLUSH_DELALLOC_WAIT); |
| 4279 | break; |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4280 | case ALLOC_CHUNK: |
| 4281 | trans = btrfs_join_transaction(root); |
| 4282 | if (IS_ERR(trans)) { |
| 4283 | ret = PTR_ERR(trans); |
| 4284 | break; |
| 4285 | } |
| 4286 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4287 | btrfs_get_alloc_profile(root, 0), |
| 4288 | CHUNK_ALLOC_NO_FORCE); |
| 4289 | btrfs_end_transaction(trans, root); |
| 4290 | if (ret == -ENOSPC) |
| 4291 | ret = 0; |
| 4292 | break; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4293 | case COMMIT_TRANS: |
| 4294 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); |
| 4295 | break; |
| 4296 | default: |
| 4297 | ret = -ENOSPC; |
| 4298 | break; |
| 4299 | } |
| 4300 | |
| 4301 | return ret; |
| 4302 | } |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4303 | |
| 4304 | static inline u64 |
| 4305 | btrfs_calc_reclaim_metadata_size(struct btrfs_root *root, |
| 4306 | struct btrfs_space_info *space_info) |
| 4307 | { |
| 4308 | u64 used; |
| 4309 | u64 expected; |
| 4310 | u64 to_reclaim; |
| 4311 | |
| 4312 | to_reclaim = min_t(u64, num_online_cpus() * 1024 * 1024, |
| 4313 | 16 * 1024 * 1024); |
| 4314 | spin_lock(&space_info->lock); |
| 4315 | if (can_overcommit(root, space_info, to_reclaim, |
| 4316 | BTRFS_RESERVE_FLUSH_ALL)) { |
| 4317 | to_reclaim = 0; |
| 4318 | goto out; |
| 4319 | } |
| 4320 | |
| 4321 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4322 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4323 | space_info->bytes_may_use; |
| 4324 | if (can_overcommit(root, space_info, 1024 * 1024, |
| 4325 | BTRFS_RESERVE_FLUSH_ALL)) |
| 4326 | expected = div_factor_fine(space_info->total_bytes, 95); |
| 4327 | else |
| 4328 | expected = div_factor_fine(space_info->total_bytes, 90); |
| 4329 | |
| 4330 | if (used > expected) |
| 4331 | to_reclaim = used - expected; |
| 4332 | else |
| 4333 | to_reclaim = 0; |
| 4334 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + |
| 4335 | space_info->bytes_reserved); |
| 4336 | out: |
| 4337 | spin_unlock(&space_info->lock); |
| 4338 | |
| 4339 | return to_reclaim; |
| 4340 | } |
| 4341 | |
| 4342 | static inline int need_do_async_reclaim(struct btrfs_space_info *space_info, |
| 4343 | struct btrfs_fs_info *fs_info, u64 used) |
| 4344 | { |
| 4345 | return (used >= div_factor_fine(space_info->total_bytes, 98) && |
| 4346 | !btrfs_fs_closing(fs_info) && |
| 4347 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); |
| 4348 | } |
| 4349 | |
| 4350 | static int btrfs_need_do_async_reclaim(struct btrfs_space_info *space_info, |
| 4351 | struct btrfs_fs_info *fs_info) |
| 4352 | { |
| 4353 | u64 used; |
| 4354 | |
| 4355 | spin_lock(&space_info->lock); |
| 4356 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4357 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4358 | space_info->bytes_may_use; |
| 4359 | if (need_do_async_reclaim(space_info, fs_info, used)) { |
| 4360 | spin_unlock(&space_info->lock); |
| 4361 | return 1; |
| 4362 | } |
| 4363 | spin_unlock(&space_info->lock); |
| 4364 | |
| 4365 | return 0; |
| 4366 | } |
| 4367 | |
| 4368 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) |
| 4369 | { |
| 4370 | struct btrfs_fs_info *fs_info; |
| 4371 | struct btrfs_space_info *space_info; |
| 4372 | u64 to_reclaim; |
| 4373 | int flush_state; |
| 4374 | |
| 4375 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); |
| 4376 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
| 4377 | |
| 4378 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root, |
| 4379 | space_info); |
| 4380 | if (!to_reclaim) |
| 4381 | return; |
| 4382 | |
| 4383 | flush_state = FLUSH_DELAYED_ITEMS_NR; |
| 4384 | do { |
| 4385 | flush_space(fs_info->fs_root, space_info, to_reclaim, |
| 4386 | to_reclaim, flush_state); |
| 4387 | flush_state++; |
| 4388 | if (!btrfs_need_do_async_reclaim(space_info, fs_info)) |
| 4389 | return; |
| 4390 | } while (flush_state <= COMMIT_TRANS); |
| 4391 | |
| 4392 | if (btrfs_need_do_async_reclaim(space_info, fs_info)) |
| 4393 | queue_work(system_unbound_wq, work); |
| 4394 | } |
| 4395 | |
| 4396 | void btrfs_init_async_reclaim_work(struct work_struct *work) |
| 4397 | { |
| 4398 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); |
| 4399 | } |
| 4400 | |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4401 | /** |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4402 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space |
| 4403 | * @root - the root we're allocating for |
| 4404 | * @block_rsv - the block_rsv we're allocating for |
| 4405 | * @orig_bytes - the number of bytes we want |
Adam Buchbinder | 48fc7f7 | 2012-09-19 21:48:00 -0400 | [diff] [blame] | 4406 | * @flush - whether or not we can flush to make our reservation |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4407 | * |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4408 | * This will reserve orgi_bytes number of bytes from the space info associated |
| 4409 | * with the block_rsv. If there is not enough space it will make an attempt to |
| 4410 | * flush out space to make room. It will do this by flushing delalloc if |
| 4411 | * possible or committing the transaction. If flush is 0 then no attempts to |
| 4412 | * regain reservations will be made and this will fail if there is not enough |
| 4413 | * space already. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4414 | */ |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4415 | static int reserve_metadata_bytes(struct btrfs_root *root, |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4416 | struct btrfs_block_rsv *block_rsv, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4417 | u64 orig_bytes, |
| 4418 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4419 | { |
| 4420 | struct btrfs_space_info *space_info = block_rsv->space_info; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4421 | u64 used; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4422 | u64 num_bytes = orig_bytes; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4423 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4424 | int ret = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4425 | bool flushing = false; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4426 | |
| 4427 | again: |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4428 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4429 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4430 | /* |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4431 | * We only want to wait if somebody other than us is flushing and we |
| 4432 | * are actually allowed to flush all things. |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4433 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4434 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
| 4435 | space_info->flush) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4436 | spin_unlock(&space_info->lock); |
| 4437 | /* |
| 4438 | * If we have a trans handle we can't wait because the flusher |
| 4439 | * may have to commit the transaction, which would mean we would |
| 4440 | * deadlock since we are waiting for the flusher to finish, but |
| 4441 | * hold the current transaction open. |
| 4442 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4443 | if (current->journal_info) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4444 | return -EAGAIN; |
Arne Jansen | b9688bb | 2012-04-18 10:27:16 +0200 | [diff] [blame] | 4445 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
| 4446 | /* Must have been killed, return */ |
| 4447 | if (ret) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4448 | return -EINTR; |
| 4449 | |
| 4450 | spin_lock(&space_info->lock); |
| 4451 | } |
| 4452 | |
| 4453 | ret = -ENOSPC; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4454 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4455 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4456 | space_info->bytes_may_use; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4457 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4458 | /* |
| 4459 | * The idea here is that we've not already over-reserved the block group |
| 4460 | * then we can go ahead and save our reservation first and then start |
| 4461 | * flushing if we need to. Otherwise if we've already overcommitted |
| 4462 | * lets start flushing stuff first and then come back and try to make |
| 4463 | * our reservation. |
| 4464 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4465 | if (used <= space_info->total_bytes) { |
| 4466 | if (used + orig_bytes <= space_info->total_bytes) { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4467 | space_info->bytes_may_use += orig_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4468 | trace_btrfs_space_reservation(root->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4469 | "space_info", space_info->flags, orig_bytes, 1); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4470 | ret = 0; |
| 4471 | } else { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4472 | /* |
| 4473 | * Ok set num_bytes to orig_bytes since we aren't |
| 4474 | * overocmmitted, this way we only try and reclaim what |
| 4475 | * we need. |
| 4476 | */ |
| 4477 | num_bytes = orig_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4478 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4479 | } else { |
| 4480 | /* |
| 4481 | * Ok we're over committed, set num_bytes to the overcommitted |
| 4482 | * amount plus the amount of bytes that we need for this |
| 4483 | * reservation. |
| 4484 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4485 | num_bytes = used - space_info->total_bytes + |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4486 | (orig_bytes * 2); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4487 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4488 | |
Josef Bacik | 44734ed | 2012-09-28 16:04:19 -0400 | [diff] [blame] | 4489 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
| 4490 | space_info->bytes_may_use += orig_bytes; |
| 4491 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
| 4492 | space_info->flags, orig_bytes, |
| 4493 | 1); |
| 4494 | ret = 0; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4495 | } |
| 4496 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4497 | /* |
| 4498 | * Couldn't make our reservation, save our place so while we're trying |
| 4499 | * to reclaim space we can actually use it instead of somebody else |
| 4500 | * stealing it from us. |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4501 | * |
| 4502 | * We make the other tasks wait for the flush only when we can flush |
| 4503 | * all things. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4504 | */ |
Josef Bacik | 72bcd99 | 2012-12-18 15:16:34 -0500 | [diff] [blame] | 4505 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4506 | flushing = true; |
| 4507 | space_info->flush = 1; |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 4508 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
| 4509 | used += orig_bytes; |
| 4510 | if (need_do_async_reclaim(space_info, root->fs_info, used) && |
| 4511 | !work_busy(&root->fs_info->async_reclaim_work)) |
| 4512 | queue_work(system_unbound_wq, |
| 4513 | &root->fs_info->async_reclaim_work); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4514 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4515 | spin_unlock(&space_info->lock); |
| 4516 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4517 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4518 | goto out; |
| 4519 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4520 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
| 4521 | flush_state); |
| 4522 | flush_state++; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4523 | |
| 4524 | /* |
| 4525 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock |
| 4526 | * would happen. So skip delalloc flush. |
| 4527 | */ |
| 4528 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4529 | (flush_state == FLUSH_DELALLOC || |
| 4530 | flush_state == FLUSH_DELALLOC_WAIT)) |
| 4531 | flush_state = ALLOC_CHUNK; |
| 4532 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4533 | if (!ret) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4534 | goto again; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4535 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4536 | flush_state < COMMIT_TRANS) |
| 4537 | goto again; |
| 4538 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && |
| 4539 | flush_state <= COMMIT_TRANS) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4540 | goto again; |
| 4541 | |
| 4542 | out: |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 4543 | if (ret == -ENOSPC && |
| 4544 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { |
| 4545 | struct btrfs_block_rsv *global_rsv = |
| 4546 | &root->fs_info->global_block_rsv; |
| 4547 | |
| 4548 | if (block_rsv != global_rsv && |
| 4549 | !block_rsv_use_bytes(global_rsv, orig_bytes)) |
| 4550 | ret = 0; |
| 4551 | } |
Jeff Mahoney | cab45e2 | 2013-10-16 16:27:01 -0400 | [diff] [blame] | 4552 | if (ret == -ENOSPC) |
| 4553 | trace_btrfs_space_reservation(root->fs_info, |
| 4554 | "space_info:enospc", |
| 4555 | space_info->flags, orig_bytes, 1); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4556 | if (flushing) { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4557 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4558 | space_info->flush = 0; |
| 4559 | wake_up_all(&space_info->wait); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4560 | spin_unlock(&space_info->lock); |
| 4561 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4562 | return ret; |
| 4563 | } |
| 4564 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4565 | static struct btrfs_block_rsv *get_block_rsv( |
| 4566 | const struct btrfs_trans_handle *trans, |
| 4567 | const struct btrfs_root *root) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4568 | { |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4569 | struct btrfs_block_rsv *block_rsv = NULL; |
| 4570 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 4571 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 4572 | block_rsv = trans->block_rsv; |
| 4573 | |
| 4574 | if (root == root->fs_info->csum_root && trans->adding_csums) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4575 | block_rsv = trans->block_rsv; |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4576 | |
Stefan Behrens | f7a81ea | 2013-08-15 17:11:19 +0200 | [diff] [blame] | 4577 | if (root == root->fs_info->uuid_root) |
| 4578 | block_rsv = trans->block_rsv; |
| 4579 | |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4580 | if (!block_rsv) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4581 | block_rsv = root->block_rsv; |
| 4582 | |
| 4583 | if (!block_rsv) |
| 4584 | block_rsv = &root->fs_info->empty_block_rsv; |
| 4585 | |
| 4586 | return block_rsv; |
| 4587 | } |
| 4588 | |
| 4589 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 4590 | u64 num_bytes) |
| 4591 | { |
| 4592 | int ret = -ENOSPC; |
| 4593 | spin_lock(&block_rsv->lock); |
| 4594 | if (block_rsv->reserved >= num_bytes) { |
| 4595 | block_rsv->reserved -= num_bytes; |
| 4596 | if (block_rsv->reserved < block_rsv->size) |
| 4597 | block_rsv->full = 0; |
| 4598 | ret = 0; |
| 4599 | } |
| 4600 | spin_unlock(&block_rsv->lock); |
| 4601 | return ret; |
| 4602 | } |
| 4603 | |
| 4604 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, |
| 4605 | u64 num_bytes, int update_size) |
| 4606 | { |
| 4607 | spin_lock(&block_rsv->lock); |
| 4608 | block_rsv->reserved += num_bytes; |
| 4609 | if (update_size) |
| 4610 | block_rsv->size += num_bytes; |
| 4611 | else if (block_rsv->reserved >= block_rsv->size) |
| 4612 | block_rsv->full = 1; |
| 4613 | spin_unlock(&block_rsv->lock); |
| 4614 | } |
| 4615 | |
Josef Bacik | d52be81 | 2013-05-29 14:54:47 -0400 | [diff] [blame] | 4616 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
| 4617 | struct btrfs_block_rsv *dest, u64 num_bytes, |
| 4618 | int min_factor) |
| 4619 | { |
| 4620 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
| 4621 | u64 min_bytes; |
| 4622 | |
| 4623 | if (global_rsv->space_info != dest->space_info) |
| 4624 | return -ENOSPC; |
| 4625 | |
| 4626 | spin_lock(&global_rsv->lock); |
| 4627 | min_bytes = div_factor(global_rsv->size, min_factor); |
| 4628 | if (global_rsv->reserved < min_bytes + num_bytes) { |
| 4629 | spin_unlock(&global_rsv->lock); |
| 4630 | return -ENOSPC; |
| 4631 | } |
| 4632 | global_rsv->reserved -= num_bytes; |
| 4633 | if (global_rsv->reserved < global_rsv->size) |
| 4634 | global_rsv->full = 0; |
| 4635 | spin_unlock(&global_rsv->lock); |
| 4636 | |
| 4637 | block_rsv_add_bytes(dest, num_bytes, 1); |
| 4638 | return 0; |
| 4639 | } |
| 4640 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4641 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
| 4642 | struct btrfs_block_rsv *block_rsv, |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 4643 | struct btrfs_block_rsv *dest, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4644 | { |
| 4645 | struct btrfs_space_info *space_info = block_rsv->space_info; |
| 4646 | |
| 4647 | spin_lock(&block_rsv->lock); |
| 4648 | if (num_bytes == (u64)-1) |
| 4649 | num_bytes = block_rsv->size; |
| 4650 | block_rsv->size -= num_bytes; |
| 4651 | if (block_rsv->reserved >= block_rsv->size) { |
| 4652 | num_bytes = block_rsv->reserved - block_rsv->size; |
| 4653 | block_rsv->reserved = block_rsv->size; |
| 4654 | block_rsv->full = 1; |
| 4655 | } else { |
| 4656 | num_bytes = 0; |
| 4657 | } |
| 4658 | spin_unlock(&block_rsv->lock); |
| 4659 | |
| 4660 | if (num_bytes > 0) { |
| 4661 | if (dest) { |
Josef Bacik | e9e2289 | 2011-01-24 21:43:19 +0000 | [diff] [blame] | 4662 | spin_lock(&dest->lock); |
| 4663 | if (!dest->full) { |
| 4664 | u64 bytes_to_add; |
| 4665 | |
| 4666 | bytes_to_add = dest->size - dest->reserved; |
| 4667 | bytes_to_add = min(num_bytes, bytes_to_add); |
| 4668 | dest->reserved += bytes_to_add; |
| 4669 | if (dest->reserved >= dest->size) |
| 4670 | dest->full = 1; |
| 4671 | num_bytes -= bytes_to_add; |
| 4672 | } |
| 4673 | spin_unlock(&dest->lock); |
| 4674 | } |
| 4675 | if (num_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4676 | spin_lock(&space_info->lock); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4677 | space_info->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4678 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4679 | space_info->flags, num_bytes, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4680 | spin_unlock(&space_info->lock); |
| 4681 | } |
| 4682 | } |
| 4683 | } |
| 4684 | |
| 4685 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
| 4686 | struct btrfs_block_rsv *dst, u64 num_bytes) |
| 4687 | { |
| 4688 | int ret; |
| 4689 | |
| 4690 | ret = block_rsv_use_bytes(src, num_bytes); |
| 4691 | if (ret) |
| 4692 | return ret; |
| 4693 | |
| 4694 | block_rsv_add_bytes(dst, num_bytes, 1); |
| 4695 | return 0; |
| 4696 | } |
| 4697 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4698 | 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] | 4699 | { |
| 4700 | memset(rsv, 0, sizeof(*rsv)); |
| 4701 | spin_lock_init(&rsv->lock); |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4702 | rsv->type = type; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4703 | } |
| 4704 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4705 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
| 4706 | unsigned short type) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4707 | { |
| 4708 | struct btrfs_block_rsv *block_rsv; |
| 4709 | struct btrfs_fs_info *fs_info = root->fs_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4710 | |
| 4711 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
| 4712 | if (!block_rsv) |
| 4713 | return NULL; |
| 4714 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4715 | btrfs_init_block_rsv(block_rsv, type); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4716 | block_rsv->space_info = __find_space_info(fs_info, |
| 4717 | BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4718 | return block_rsv; |
| 4719 | } |
| 4720 | |
| 4721 | void btrfs_free_block_rsv(struct btrfs_root *root, |
| 4722 | struct btrfs_block_rsv *rsv) |
| 4723 | { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 4724 | if (!rsv) |
| 4725 | return; |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 4726 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
| 4727 | kfree(rsv); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4728 | } |
| 4729 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4730 | int btrfs_block_rsv_add(struct btrfs_root *root, |
| 4731 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, |
| 4732 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4733 | { |
| 4734 | int ret; |
| 4735 | |
| 4736 | if (num_bytes == 0) |
| 4737 | return 0; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4738 | |
Miao Xie | 61b520a | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 4739 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4740 | if (!ret) { |
| 4741 | block_rsv_add_bytes(block_rsv, num_bytes, 1); |
| 4742 | return 0; |
| 4743 | } |
| 4744 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4745 | return ret; |
| 4746 | } |
| 4747 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4748 | int btrfs_block_rsv_check(struct btrfs_root *root, |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4749 | struct btrfs_block_rsv *block_rsv, int min_factor) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4750 | { |
| 4751 | u64 num_bytes = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4752 | int ret = -ENOSPC; |
| 4753 | |
| 4754 | if (!block_rsv) |
| 4755 | return 0; |
| 4756 | |
| 4757 | spin_lock(&block_rsv->lock); |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4758 | num_bytes = div_factor(block_rsv->size, min_factor); |
| 4759 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4760 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4761 | spin_unlock(&block_rsv->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4762 | |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4763 | return ret; |
| 4764 | } |
| 4765 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4766 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
| 4767 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, |
| 4768 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4769 | { |
| 4770 | u64 num_bytes = 0; |
| 4771 | int ret = -ENOSPC; |
| 4772 | |
| 4773 | if (!block_rsv) |
| 4774 | return 0; |
| 4775 | |
| 4776 | spin_lock(&block_rsv->lock); |
| 4777 | num_bytes = min_reserved; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4778 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4779 | ret = 0; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4780 | else |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4781 | num_bytes -= block_rsv->reserved; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4782 | spin_unlock(&block_rsv->lock); |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4783 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4784 | if (!ret) |
| 4785 | return 0; |
| 4786 | |
Miao Xie | aa38a71 | 2011-11-18 17:43:00 +0800 | [diff] [blame] | 4787 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 4788 | if (!ret) { |
| 4789 | block_rsv_add_bytes(block_rsv, num_bytes, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4790 | return 0; |
| 4791 | } |
| 4792 | |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4793 | return ret; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4794 | } |
| 4795 | |
| 4796 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, |
| 4797 | struct btrfs_block_rsv *dst_rsv, |
| 4798 | u64 num_bytes) |
| 4799 | { |
| 4800 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 4801 | } |
| 4802 | |
| 4803 | void btrfs_block_rsv_release(struct btrfs_root *root, |
| 4804 | struct btrfs_block_rsv *block_rsv, |
| 4805 | u64 num_bytes) |
| 4806 | { |
| 4807 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Liu Bo | 1750458 | 2013-12-29 21:44:50 +0800 | [diff] [blame] | 4808 | if (global_rsv == block_rsv || |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4809 | block_rsv->space_info != global_rsv->space_info) |
| 4810 | global_rsv = NULL; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4811 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
| 4812 | num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4813 | } |
| 4814 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4815 | /* |
| 4816 | * helper to calculate size of global block reservation. |
| 4817 | * the desired value is sum of space used by extent tree, |
| 4818 | * checksum tree and root tree |
| 4819 | */ |
| 4820 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
| 4821 | { |
| 4822 | struct btrfs_space_info *sinfo; |
| 4823 | u64 num_bytes; |
| 4824 | u64 meta_used; |
| 4825 | u64 data_used; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 4826 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4827 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4828 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
| 4829 | spin_lock(&sinfo->lock); |
| 4830 | data_used = sinfo->bytes_used; |
| 4831 | spin_unlock(&sinfo->lock); |
| 4832 | |
| 4833 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
| 4834 | spin_lock(&sinfo->lock); |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 4835 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
| 4836 | data_used = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4837 | meta_used = sinfo->bytes_used; |
| 4838 | spin_unlock(&sinfo->lock); |
| 4839 | |
| 4840 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
| 4841 | csum_size * 2; |
| 4842 | num_bytes += div64_u64(data_used + meta_used, 50); |
| 4843 | |
| 4844 | if (num_bytes * 3 > meta_used) |
Chris Mason | 8e62c2d | 2012-04-12 13:46:48 -0400 | [diff] [blame] | 4845 | num_bytes = div64_u64(meta_used, 3); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4846 | |
| 4847 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
| 4848 | } |
| 4849 | |
| 4850 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4851 | { |
| 4852 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| 4853 | struct btrfs_space_info *sinfo = block_rsv->space_info; |
| 4854 | u64 num_bytes; |
| 4855 | |
| 4856 | num_bytes = calc_global_metadata_size(fs_info); |
| 4857 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4858 | spin_lock(&sinfo->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 4859 | spin_lock(&block_rsv->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4860 | |
Josef Bacik | fdf30d1 | 2013-03-26 15:31:45 -0400 | [diff] [blame] | 4861 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4862 | |
| 4863 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 4864 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
| 4865 | sinfo->bytes_may_use; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4866 | |
| 4867 | if (sinfo->total_bytes > num_bytes) { |
| 4868 | num_bytes = sinfo->total_bytes - num_bytes; |
| 4869 | block_rsv->reserved += num_bytes; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4870 | sinfo->bytes_may_use += num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4871 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4872 | sinfo->flags, num_bytes, 1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4873 | } |
| 4874 | |
| 4875 | if (block_rsv->reserved >= block_rsv->size) { |
| 4876 | num_bytes = block_rsv->reserved - block_rsv->size; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4877 | sinfo->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4878 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4879 | sinfo->flags, num_bytes, 0); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4880 | block_rsv->reserved = block_rsv->size; |
| 4881 | block_rsv->full = 1; |
| 4882 | } |
David Sterba | 182608c | 2011-05-05 13:13:16 +0200 | [diff] [blame] | 4883 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4884 | spin_unlock(&block_rsv->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 4885 | spin_unlock(&sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4886 | } |
| 4887 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4888 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4889 | { |
| 4890 | struct btrfs_space_info *space_info; |
| 4891 | |
| 4892 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 4893 | fs_info->chunk_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4894 | |
| 4895 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4896 | fs_info->global_block_rsv.space_info = space_info; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4897 | fs_info->delalloc_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4898 | fs_info->trans_block_rsv.space_info = space_info; |
| 4899 | fs_info->empty_block_rsv.space_info = space_info; |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4900 | fs_info->delayed_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4901 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4902 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
| 4903 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; |
| 4904 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; |
| 4905 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; |
Stefan Behrens | 3a6cad9 | 2013-05-16 14:48:19 +0000 | [diff] [blame] | 4906 | if (fs_info->quota_root) |
| 4907 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4908 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4909 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4910 | update_global_block_rsv(fs_info); |
| 4911 | } |
| 4912 | |
| 4913 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4914 | { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4915 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
| 4916 | (u64)-1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4917 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
| 4918 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); |
| 4919 | WARN_ON(fs_info->trans_block_rsv.size > 0); |
| 4920 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); |
| 4921 | WARN_ON(fs_info->chunk_block_rsv.size > 0); |
| 4922 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4923 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
| 4924 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 4925 | } |
| 4926 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4927 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
| 4928 | struct btrfs_root *root) |
| 4929 | { |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 4930 | if (!trans->block_rsv) |
| 4931 | return; |
| 4932 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4933 | if (!trans->bytes_reserved) |
| 4934 | return; |
| 4935 | |
Chris Mason | e77266e | 2012-02-24 10:39:05 -0500 | [diff] [blame] | 4936 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4937 | trans->transid, trans->bytes_reserved, 0); |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 4938 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4939 | trans->bytes_reserved = 0; |
| 4940 | } |
| 4941 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4942 | /* Can only return 0 or -ENOSPC */ |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4943 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
| 4944 | struct inode *inode) |
| 4945 | { |
| 4946 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4947 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); |
| 4948 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; |
| 4949 | |
| 4950 | /* |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 4951 | * We need to hold space in order to delete our orphan item once we've |
| 4952 | * added it, so this takes the reservation so we can release it later |
| 4953 | * when we are truly done with the orphan item. |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4954 | */ |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4955 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4956 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 4957 | btrfs_ino(inode), num_bytes, 1); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4958 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 4959 | } |
| 4960 | |
| 4961 | void btrfs_orphan_release_metadata(struct inode *inode) |
| 4962 | { |
| 4963 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4964 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4965 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 4966 | btrfs_ino(inode), num_bytes, 0); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4967 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
| 4968 | } |
| 4969 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4970 | /* |
| 4971 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation |
| 4972 | * root: the root of the parent directory |
| 4973 | * rsv: block reservation |
| 4974 | * items: the number of items that we need do reservation |
| 4975 | * qgroup_reserved: used to return the reserved size in qgroup |
| 4976 | * |
| 4977 | * This function is used to reserve the space for snapshot/subvolume |
| 4978 | * creation and deletion. Those operations are different with the |
| 4979 | * common file/directory operations, they change two fs/file trees |
| 4980 | * and root tree, the number of items that the qgroup reserves is |
| 4981 | * different with the free space reservation. So we can not use |
| 4982 | * the space reseravtion mechanism in start_transaction(). |
| 4983 | */ |
| 4984 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, |
| 4985 | struct btrfs_block_rsv *rsv, |
| 4986 | int items, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 4987 | u64 *qgroup_reserved, |
| 4988 | bool use_global_rsv) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4989 | { |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4990 | u64 num_bytes; |
| 4991 | int ret; |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 4992 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4993 | |
| 4994 | if (root->fs_info->quota_enabled) { |
| 4995 | /* One for parent inode, two for dir entries */ |
| 4996 | num_bytes = 3 * root->leafsize; |
| 4997 | ret = btrfs_qgroup_reserve(root, num_bytes); |
| 4998 | if (ret) |
| 4999 | return ret; |
| 5000 | } else { |
| 5001 | num_bytes = 0; |
| 5002 | } |
| 5003 | |
| 5004 | *qgroup_reserved = num_bytes; |
| 5005 | |
| 5006 | num_bytes = btrfs_calc_trans_metadata_size(root, items); |
| 5007 | rsv->space_info = __find_space_info(root->fs_info, |
| 5008 | BTRFS_BLOCK_GROUP_METADATA); |
| 5009 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, |
| 5010 | BTRFS_RESERVE_FLUSH_ALL); |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 5011 | |
| 5012 | if (ret == -ENOSPC && use_global_rsv) |
| 5013 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); |
| 5014 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 5015 | if (ret) { |
| 5016 | if (*qgroup_reserved) |
| 5017 | btrfs_qgroup_free(root, *qgroup_reserved); |
| 5018 | } |
| 5019 | |
| 5020 | return ret; |
| 5021 | } |
| 5022 | |
| 5023 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, |
| 5024 | struct btrfs_block_rsv *rsv, |
| 5025 | u64 qgroup_reserved) |
| 5026 | { |
| 5027 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
| 5028 | if (qgroup_reserved) |
| 5029 | btrfs_qgroup_free(root, qgroup_reserved); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5030 | } |
| 5031 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5032 | /** |
| 5033 | * drop_outstanding_extent - drop an outstanding extent |
| 5034 | * @inode: the inode we're dropping the extent for |
| 5035 | * |
| 5036 | * This is called when we are freeing up an outstanding extent, either called |
| 5037 | * after an error or after an extent is written. This will return the number of |
| 5038 | * reserved extents that need to be freed. This must be called with |
| 5039 | * BTRFS_I(inode)->lock held. |
| 5040 | */ |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5041 | static unsigned drop_outstanding_extent(struct inode *inode) |
| 5042 | { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5043 | unsigned drop_inode_space = 0; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5044 | unsigned dropped_extents = 0; |
| 5045 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5046 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
| 5047 | BTRFS_I(inode)->outstanding_extents--; |
| 5048 | |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5049 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5050 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5051 | &BTRFS_I(inode)->runtime_flags)) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5052 | drop_inode_space = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5053 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5054 | /* |
| 5055 | * If we have more or the same amount of outsanding extents than we have |
| 5056 | * reserved then we need to leave the reserved extents count alone. |
| 5057 | */ |
| 5058 | if (BTRFS_I(inode)->outstanding_extents >= |
| 5059 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5060 | return drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5061 | |
| 5062 | dropped_extents = BTRFS_I(inode)->reserved_extents - |
| 5063 | BTRFS_I(inode)->outstanding_extents; |
| 5064 | BTRFS_I(inode)->reserved_extents -= dropped_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5065 | return dropped_extents + drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5066 | } |
| 5067 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5068 | /** |
| 5069 | * calc_csum_metadata_size - return the amount of metada space that must be |
| 5070 | * reserved/free'd for the given bytes. |
| 5071 | * @inode: the inode we're manipulating |
| 5072 | * @num_bytes: the number of bytes in question |
| 5073 | * @reserve: 1 if we are reserving space, 0 if we are freeing space |
| 5074 | * |
| 5075 | * This adjusts the number of csum_bytes in the inode and then returns the |
| 5076 | * correct amount of metadata that must either be reserved or freed. We |
| 5077 | * calculate how many checksums we can fit into one leaf and then divide the |
| 5078 | * number of bytes that will need to be checksumed by this value to figure out |
| 5079 | * how many checksums will be required. If we are adding bytes then the number |
| 5080 | * may go up and we will return the number of additional bytes that must be |
| 5081 | * reserved. If it is going down we will return the number of bytes that must |
| 5082 | * be freed. |
| 5083 | * |
| 5084 | * This must be called with BTRFS_I(inode)->lock held. |
| 5085 | */ |
| 5086 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, |
| 5087 | int reserve) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5088 | { |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5089 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5090 | u64 csum_size; |
| 5091 | int num_csums_per_leaf; |
| 5092 | int num_csums; |
| 5093 | int old_csums; |
| 5094 | |
| 5095 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && |
| 5096 | BTRFS_I(inode)->csum_bytes == 0) |
| 5097 | return 0; |
| 5098 | |
| 5099 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); |
| 5100 | if (reserve) |
| 5101 | BTRFS_I(inode)->csum_bytes += num_bytes; |
| 5102 | else |
| 5103 | BTRFS_I(inode)->csum_bytes -= num_bytes; |
| 5104 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); |
| 5105 | num_csums_per_leaf = (int)div64_u64(csum_size, |
| 5106 | sizeof(struct btrfs_csum_item) + |
| 5107 | sizeof(struct btrfs_disk_key)); |
| 5108 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); |
| 5109 | num_csums = num_csums + num_csums_per_leaf - 1; |
| 5110 | num_csums = num_csums / num_csums_per_leaf; |
| 5111 | |
| 5112 | old_csums = old_csums + num_csums_per_leaf - 1; |
| 5113 | old_csums = old_csums / num_csums_per_leaf; |
| 5114 | |
| 5115 | /* No change, no need to reserve more */ |
| 5116 | if (old_csums == num_csums) |
| 5117 | return 0; |
| 5118 | |
| 5119 | if (reserve) |
| 5120 | return btrfs_calc_trans_metadata_size(root, |
| 5121 | num_csums - old_csums); |
| 5122 | |
| 5123 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5124 | } |
| 5125 | |
| 5126 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
| 5127 | { |
| 5128 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5129 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5130 | u64 to_reserve = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5131 | u64 csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5132 | unsigned nr_extents = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5133 | int extra_reserve = 0; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5134 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
Jan Schmidt | eb6b88d | 2013-01-27 23:26:00 -0700 | [diff] [blame] | 5135 | int ret = 0; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5136 | bool delalloc_lock = true; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5137 | u64 to_free = 0; |
| 5138 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5139 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5140 | /* If we are a free space inode we need to not flush since we will be in |
| 5141 | * the middle of a transaction commit. We also don't need the delalloc |
| 5142 | * mutex since we won't race with anybody. We need this mostly to make |
| 5143 | * lockdep shut its filthy mouth. |
| 5144 | */ |
| 5145 | if (btrfs_is_free_space_inode(inode)) { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5146 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5147 | delalloc_lock = false; |
| 5148 | } |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 5149 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 5150 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
| 5151 | btrfs_transaction_in_commit(root->fs_info)) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5152 | schedule_timeout(1); |
| 5153 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5154 | if (delalloc_lock) |
| 5155 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); |
| 5156 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5157 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 5158 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5159 | spin_lock(&BTRFS_I(inode)->lock); |
| 5160 | BTRFS_I(inode)->outstanding_extents++; |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 5161 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5162 | if (BTRFS_I(inode)->outstanding_extents > |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5163 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5164 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
| 5165 | BTRFS_I(inode)->reserved_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5166 | |
| 5167 | /* |
| 5168 | * Add an item to reserve for updating the inode when we complete the |
| 5169 | * delalloc io. |
| 5170 | */ |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5171 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5172 | &BTRFS_I(inode)->runtime_flags)) { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5173 | nr_extents++; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5174 | extra_reserve = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 5175 | } |
| 5176 | |
| 5177 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5178 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5179 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5180 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 5181 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5182 | if (root->fs_info->quota_enabled) { |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5183 | ret = btrfs_qgroup_reserve(root, num_bytes + |
| 5184 | nr_extents * root->leafsize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5185 | if (ret) |
| 5186 | goto out_fail; |
Wang Shilong | a9870c0 | 2013-03-01 11:33:01 +0000 | [diff] [blame] | 5187 | } |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5188 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5189 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
| 5190 | if (unlikely(ret)) { |
| 5191 | if (root->fs_info->quota_enabled) |
Miao Xie | 4b5829a | 2012-12-05 10:53:25 +0000 | [diff] [blame] | 5192 | btrfs_qgroup_free(root, num_bytes + |
| 5193 | nr_extents * root->leafsize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5194 | goto out_fail; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5195 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5196 | |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5197 | spin_lock(&BTRFS_I(inode)->lock); |
| 5198 | if (extra_reserve) { |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 5199 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 5200 | &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5201 | nr_extents--; |
| 5202 | } |
| 5203 | BTRFS_I(inode)->reserved_extents += nr_extents; |
| 5204 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 5205 | |
| 5206 | if (delalloc_lock) |
| 5207 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 5208 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5209 | if (to_reserve) |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 5210 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5211 | btrfs_ino(inode), to_reserve, 1); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5212 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
| 5213 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5214 | return 0; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5215 | |
| 5216 | out_fail: |
| 5217 | spin_lock(&BTRFS_I(inode)->lock); |
| 5218 | dropped = drop_outstanding_extent(inode); |
| 5219 | /* |
| 5220 | * If the inodes csum_bytes is the same as the original |
| 5221 | * csum_bytes then we know we haven't raced with any free()ers |
| 5222 | * so we can just reduce our inodes csum bytes and carry on. |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5223 | */ |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5224 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5225 | calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5226 | } else { |
| 5227 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; |
| 5228 | u64 bytes; |
| 5229 | |
| 5230 | /* |
| 5231 | * This is tricky, but first we need to figure out how much we |
| 5232 | * free'd from any free-ers that occured during this |
| 5233 | * reservation, so we reset ->csum_bytes to the csum_bytes |
| 5234 | * before we dropped our lock, and then call the free for the |
| 5235 | * number of bytes that were freed while we were trying our |
| 5236 | * reservation. |
| 5237 | */ |
| 5238 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; |
| 5239 | BTRFS_I(inode)->csum_bytes = csum_bytes; |
| 5240 | to_free = calc_csum_metadata_size(inode, bytes, 0); |
| 5241 | |
| 5242 | |
| 5243 | /* |
| 5244 | * Now we need to see how much we would have freed had we not |
| 5245 | * been making this reservation and our ->csum_bytes were not |
| 5246 | * artificially inflated. |
| 5247 | */ |
| 5248 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; |
| 5249 | bytes = csum_bytes - orig_csum_bytes; |
| 5250 | bytes = calc_csum_metadata_size(inode, bytes, 0); |
| 5251 | |
| 5252 | /* |
| 5253 | * Now reset ->csum_bytes to what it should be. If bytes is |
| 5254 | * more than to_free then we would have free'd more space had we |
| 5255 | * not had an artificially high ->csum_bytes, so we need to free |
| 5256 | * the remainder. If bytes is the same or less then we don't |
| 5257 | * need to do anything, the other free-ers did the correct |
| 5258 | * thing. |
| 5259 | */ |
| 5260 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; |
| 5261 | if (bytes > to_free) |
| 5262 | to_free = bytes - to_free; |
| 5263 | else |
| 5264 | to_free = 0; |
| 5265 | } |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5266 | spin_unlock(&BTRFS_I(inode)->lock); |
| 5267 | if (dropped) |
| 5268 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
| 5269 | |
| 5270 | if (to_free) { |
| 5271 | btrfs_block_rsv_release(root, block_rsv, to_free); |
| 5272 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5273 | btrfs_ino(inode), to_free, 0); |
| 5274 | } |
| 5275 | if (delalloc_lock) |
| 5276 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
| 5277 | return ret; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5278 | } |
| 5279 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5280 | /** |
| 5281 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode |
| 5282 | * @inode: the inode to release the reservation for |
| 5283 | * @num_bytes: the number of bytes we're releasing |
| 5284 | * |
| 5285 | * This will release the metadata reservation for an inode. This can be called |
| 5286 | * once we complete IO for a given set of bytes to release their metadata |
| 5287 | * reservations. |
| 5288 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5289 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
| 5290 | { |
| 5291 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5292 | u64 to_free = 0; |
| 5293 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5294 | |
| 5295 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5296 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5297 | dropped = drop_outstanding_extent(inode); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5298 | |
Miao Xie | 0934856 | 2013-02-07 10:12:07 +0000 | [diff] [blame] | 5299 | if (num_bytes) |
| 5300 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5301 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5302 | if (dropped > 0) |
| 5303 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5304 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5305 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5306 | btrfs_ino(inode), to_free, 0); |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5307 | if (root->fs_info->quota_enabled) { |
| 5308 | btrfs_qgroup_free(root, num_bytes + |
| 5309 | dropped * root->leafsize); |
| 5310 | } |
| 5311 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5312 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
| 5313 | to_free); |
| 5314 | } |
| 5315 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5316 | /** |
| 5317 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc |
| 5318 | * @inode: inode we're writing to |
| 5319 | * @num_bytes: the number of bytes we want to allocate |
| 5320 | * |
| 5321 | * This will do the following things |
| 5322 | * |
| 5323 | * o reserve space in the data space info for num_bytes |
| 5324 | * o reserve space in the metadata space info based on number of outstanding |
| 5325 | * extents and how much csums will be needed |
| 5326 | * o add to the inodes ->delalloc_bytes |
| 5327 | * o add it to the fs_info's delalloc inodes list. |
| 5328 | * |
| 5329 | * This will return 0 for success and -ENOSPC if there is no space left. |
| 5330 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5331 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
| 5332 | { |
| 5333 | int ret; |
| 5334 | |
| 5335 | ret = btrfs_check_data_free_space(inode, num_bytes); |
| 5336 | if (ret) |
| 5337 | return ret; |
| 5338 | |
| 5339 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); |
| 5340 | if (ret) { |
| 5341 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5342 | return ret; |
| 5343 | } |
| 5344 | |
| 5345 | return 0; |
| 5346 | } |
| 5347 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5348 | /** |
| 5349 | * btrfs_delalloc_release_space - release data and metadata space for delalloc |
| 5350 | * @inode: inode we're releasing space for |
| 5351 | * @num_bytes: the number of bytes we want to free up |
| 5352 | * |
| 5353 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is |
| 5354 | * called in the case that we don't need the metadata AND data reservations |
| 5355 | * anymore. So if there is an error or we insert an inline extent. |
| 5356 | * |
| 5357 | * This function will release the metadata space that was not used and will |
| 5358 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes |
| 5359 | * list if there are no delalloc bytes left. |
| 5360 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5361 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
| 5362 | { |
| 5363 | btrfs_delalloc_release_metadata(inode, num_bytes); |
| 5364 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5365 | } |
| 5366 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 5367 | static int update_block_group(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5368 | u64 bytenr, u64 num_bytes, int alloc) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5369 | { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5370 | struct btrfs_block_group_cache *cache = NULL; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5371 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5372 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5373 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5374 | u64 byte_in_group; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5375 | int factor; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 5376 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5377 | /* block accounting for super block */ |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5378 | spin_lock(&info->delalloc_root_lock); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5379 | old_val = btrfs_super_bytes_used(info->super_copy); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5380 | if (alloc) |
| 5381 | old_val += num_bytes; |
| 5382 | else |
| 5383 | old_val -= num_bytes; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5384 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5385 | spin_unlock(&info->delalloc_root_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5386 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5387 | while (total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5388 | cache = btrfs_lookup_block_group(info, bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5389 | if (!cache) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5390 | return -ENOENT; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5391 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 5392 | BTRFS_BLOCK_GROUP_RAID1 | |
| 5393 | BTRFS_BLOCK_GROUP_RAID10)) |
| 5394 | factor = 2; |
| 5395 | else |
| 5396 | factor = 1; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 5397 | /* |
| 5398 | * If this block group has free space cache written out, we |
| 5399 | * need to make sure to load it if we are removing space. This |
| 5400 | * is because we need the unpinning stage to actually add the |
| 5401 | * space back to the block group, otherwise we will leak space. |
| 5402 | */ |
| 5403 | if (!alloc && cache->cached == BTRFS_CACHE_NO) |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5404 | cache_block_group(cache, 1); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5405 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5406 | byte_in_group = bytenr - cache->key.objectid; |
| 5407 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5408 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5409 | spin_lock(&cache->space_info->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5410 | spin_lock(&cache->lock); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5411 | |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 5412 | if (btrfs_test_opt(root, SPACE_CACHE) && |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5413 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
| 5414 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
| 5415 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5416 | cache->dirty = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5417 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5418 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5419 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5420 | old_val += num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5421 | btrfs_set_block_group_used(&cache->item, old_val); |
| 5422 | cache->reserved -= num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5423 | cache->space_info->bytes_reserved -= num_bytes; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5424 | cache->space_info->bytes_used += num_bytes; |
| 5425 | cache->space_info->disk_used += num_bytes * factor; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5426 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5427 | spin_unlock(&cache->space_info->lock); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5428 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5429 | old_val -= num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5430 | btrfs_set_block_group_used(&cache->item, old_val); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5431 | cache->pinned += num_bytes; |
| 5432 | cache->space_info->bytes_pinned += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5433 | cache->space_info->bytes_used -= num_bytes; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5434 | cache->space_info->disk_used -= num_bytes * factor; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5435 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5436 | spin_unlock(&cache->space_info->lock); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5437 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5438 | set_extent_dirty(info->pinned_extents, |
| 5439 | bytenr, bytenr + num_bytes - 1, |
| 5440 | GFP_NOFS | __GFP_NOFAIL); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5441 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5442 | btrfs_put_block_group(cache); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5443 | total -= num_bytes; |
| 5444 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5445 | } |
| 5446 | return 0; |
| 5447 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5448 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5449 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 5450 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5451 | struct btrfs_block_group_cache *cache; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5452 | u64 bytenr; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5453 | |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 5454 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 5455 | bytenr = root->fs_info->first_logical_byte; |
| 5456 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 5457 | |
| 5458 | if (bytenr < (u64)-1) |
| 5459 | return bytenr; |
| 5460 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5461 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
| 5462 | if (!cache) |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5463 | return 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5464 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5465 | bytenr = cache->key.objectid; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5466 | btrfs_put_block_group(cache); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5467 | |
| 5468 | return bytenr; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5469 | } |
| 5470 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5471 | static int pin_down_extent(struct btrfs_root *root, |
| 5472 | struct btrfs_block_group_cache *cache, |
| 5473 | u64 bytenr, u64 num_bytes, int reserved) |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5474 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5475 | spin_lock(&cache->space_info->lock); |
| 5476 | spin_lock(&cache->lock); |
| 5477 | cache->pinned += num_bytes; |
| 5478 | cache->space_info->bytes_pinned += num_bytes; |
| 5479 | if (reserved) { |
| 5480 | cache->reserved -= num_bytes; |
| 5481 | cache->space_info->bytes_reserved -= num_bytes; |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5482 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5483 | spin_unlock(&cache->lock); |
| 5484 | spin_unlock(&cache->space_info->lock); |
| 5485 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5486 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
| 5487 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 5488 | if (reserved) |
| 5489 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5490 | return 0; |
| 5491 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5492 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5493 | /* |
| 5494 | * this function must be called within transaction |
| 5495 | */ |
| 5496 | int btrfs_pin_extent(struct btrfs_root *root, |
| 5497 | u64 bytenr, u64 num_bytes, int reserved) |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5498 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5499 | struct btrfs_block_group_cache *cache; |
| 5500 | |
| 5501 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5502 | BUG_ON(!cache); /* Logic error */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5503 | |
| 5504 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); |
| 5505 | |
| 5506 | btrfs_put_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5507 | return 0; |
| 5508 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5509 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5510 | /* |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5511 | * this function must be called within transaction |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5512 | */ |
Liu Bo | dcfac41 | 2012-12-27 09:01:20 +0000 | [diff] [blame] | 5513 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5514 | u64 bytenr, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5515 | { |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5516 | struct btrfs_block_group_cache *cache; |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5517 | int ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5518 | |
| 5519 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5520 | if (!cache) |
| 5521 | return -EINVAL; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5522 | |
| 5523 | /* |
| 5524 | * pull in the free space cache (if any) so that our pin |
| 5525 | * removes the free space from the cache. We have load_only set |
| 5526 | * to one because the slow code to read in the free extents does check |
| 5527 | * the pinned extents. |
| 5528 | */ |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5529 | cache_block_group(cache, 1); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5530 | |
| 5531 | pin_down_extent(root, cache, bytenr, num_bytes, 0); |
| 5532 | |
| 5533 | /* 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] | 5534 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5535 | btrfs_put_block_group(cache); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5536 | return ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5537 | } |
| 5538 | |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 5539 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
| 5540 | { |
| 5541 | int ret; |
| 5542 | struct btrfs_block_group_cache *block_group; |
| 5543 | struct btrfs_caching_control *caching_ctl; |
| 5544 | |
| 5545 | block_group = btrfs_lookup_block_group(root->fs_info, start); |
| 5546 | if (!block_group) |
| 5547 | return -EINVAL; |
| 5548 | |
| 5549 | cache_block_group(block_group, 0); |
| 5550 | caching_ctl = get_caching_control(block_group); |
| 5551 | |
| 5552 | if (!caching_ctl) { |
| 5553 | /* Logic error */ |
| 5554 | BUG_ON(!block_group_cache_done(block_group)); |
| 5555 | ret = btrfs_remove_free_space(block_group, start, num_bytes); |
| 5556 | } else { |
| 5557 | mutex_lock(&caching_ctl->mutex); |
| 5558 | |
| 5559 | if (start >= caching_ctl->progress) { |
| 5560 | ret = add_excluded_extent(root, start, num_bytes); |
| 5561 | } else if (start + num_bytes <= caching_ctl->progress) { |
| 5562 | ret = btrfs_remove_free_space(block_group, |
| 5563 | start, num_bytes); |
| 5564 | } else { |
| 5565 | num_bytes = caching_ctl->progress - start; |
| 5566 | ret = btrfs_remove_free_space(block_group, |
| 5567 | start, num_bytes); |
| 5568 | if (ret) |
| 5569 | goto out_lock; |
| 5570 | |
| 5571 | num_bytes = (start + num_bytes) - |
| 5572 | caching_ctl->progress; |
| 5573 | start = caching_ctl->progress; |
| 5574 | ret = add_excluded_extent(root, start, num_bytes); |
| 5575 | } |
| 5576 | out_lock: |
| 5577 | mutex_unlock(&caching_ctl->mutex); |
| 5578 | put_caching_control(caching_ctl); |
| 5579 | } |
| 5580 | btrfs_put_block_group(block_group); |
| 5581 | return ret; |
| 5582 | } |
| 5583 | |
| 5584 | int btrfs_exclude_logged_extents(struct btrfs_root *log, |
| 5585 | struct extent_buffer *eb) |
| 5586 | { |
| 5587 | struct btrfs_file_extent_item *item; |
| 5588 | struct btrfs_key key; |
| 5589 | int found_type; |
| 5590 | int i; |
| 5591 | |
| 5592 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) |
| 5593 | return 0; |
| 5594 | |
| 5595 | for (i = 0; i < btrfs_header_nritems(eb); i++) { |
| 5596 | btrfs_item_key_to_cpu(eb, &key, i); |
| 5597 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 5598 | continue; |
| 5599 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); |
| 5600 | found_type = btrfs_file_extent_type(eb, item); |
| 5601 | if (found_type == BTRFS_FILE_EXTENT_INLINE) |
| 5602 | continue; |
| 5603 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) |
| 5604 | continue; |
| 5605 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); |
| 5606 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); |
| 5607 | __exclude_logged_extent(log, key.objectid, key.offset); |
| 5608 | } |
| 5609 | |
| 5610 | return 0; |
| 5611 | } |
| 5612 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5613 | /** |
| 5614 | * btrfs_update_reserved_bytes - update the block_group and space info counters |
| 5615 | * @cache: The cache we are manipulating |
| 5616 | * @num_bytes: The number of bytes in question |
| 5617 | * @reserve: One of the reservation enums |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5618 | * @delalloc: The blocks are allocated for the delalloc write |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5619 | * |
| 5620 | * This is called by the allocator when it reserves space, or by somebody who is |
| 5621 | * freeing space that was never actually used on disk. For example if you |
| 5622 | * reserve some space for a new leaf in transaction A and before transaction A |
| 5623 | * commits you free that leaf, you call this with reserve set to 0 in order to |
| 5624 | * clear the reservation. |
| 5625 | * |
| 5626 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper |
| 5627 | * ENOSPC accounting. For data we handle the reservation through clearing the |
| 5628 | * delalloc bits in the io_tree. We have to do this since we could end up |
| 5629 | * allocating less disk space for the amount of data we have reserved in the |
| 5630 | * case of compression. |
| 5631 | * |
| 5632 | * If this is a reservation and the block group has become read only we cannot |
| 5633 | * make the reservation and return -EAGAIN, otherwise this function always |
| 5634 | * succeeds. |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5635 | */ |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5636 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5637 | u64 num_bytes, int reserve, int delalloc) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5638 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5639 | struct btrfs_space_info *space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5640 | int ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5641 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5642 | spin_lock(&space_info->lock); |
| 5643 | spin_lock(&cache->lock); |
| 5644 | if (reserve != RESERVE_FREE) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5645 | if (cache->ro) { |
| 5646 | ret = -EAGAIN; |
| 5647 | } else { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5648 | cache->reserved += num_bytes; |
| 5649 | space_info->bytes_reserved += num_bytes; |
| 5650 | if (reserve == RESERVE_ALLOC) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5651 | trace_btrfs_space_reservation(cache->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5652 | "space_info", space_info->flags, |
| 5653 | num_bytes, 0); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5654 | space_info->bytes_may_use -= num_bytes; |
| 5655 | } |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5656 | |
| 5657 | if (delalloc) |
| 5658 | cache->delalloc_bytes += num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5659 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5660 | } else { |
| 5661 | if (cache->ro) |
| 5662 | space_info->bytes_readonly += num_bytes; |
| 5663 | cache->reserved -= num_bytes; |
| 5664 | space_info->bytes_reserved -= num_bytes; |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 5665 | |
| 5666 | if (delalloc) |
| 5667 | cache->delalloc_bytes -= num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5668 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5669 | spin_unlock(&cache->lock); |
| 5670 | spin_unlock(&space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5671 | return ret; |
| 5672 | } |
| 5673 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 5674 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5675 | struct btrfs_root *root) |
| 5676 | { |
| 5677 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5678 | struct btrfs_caching_control *next; |
| 5679 | struct btrfs_caching_control *caching_ctl; |
| 5680 | struct btrfs_block_group_cache *cache; |
| 5681 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 5682 | down_write(&fs_info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5683 | |
| 5684 | list_for_each_entry_safe(caching_ctl, next, |
| 5685 | &fs_info->caching_block_groups, list) { |
| 5686 | cache = caching_ctl->block_group; |
| 5687 | if (block_group_cache_done(cache)) { |
| 5688 | cache->last_byte_to_unpin = (u64)-1; |
| 5689 | list_del_init(&caching_ctl->list); |
| 5690 | put_caching_control(caching_ctl); |
| 5691 | } else { |
| 5692 | cache->last_byte_to_unpin = caching_ctl->progress; |
| 5693 | } |
| 5694 | } |
| 5695 | |
| 5696 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 5697 | fs_info->pinned_extents = &fs_info->freed_extents[1]; |
| 5698 | else |
| 5699 | fs_info->pinned_extents = &fs_info->freed_extents[0]; |
| 5700 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 5701 | up_write(&fs_info->commit_root_sem); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5702 | |
| 5703 | update_global_block_rsv(fs_info); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5704 | } |
| 5705 | |
| 5706 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
| 5707 | { |
| 5708 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5709 | struct btrfs_block_group_cache *cache = NULL; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5710 | struct btrfs_space_info *space_info; |
| 5711 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5712 | u64 len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5713 | bool readonly; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5714 | |
| 5715 | while (start <= end) { |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5716 | readonly = false; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5717 | if (!cache || |
| 5718 | start >= cache->key.objectid + cache->key.offset) { |
| 5719 | if (cache) |
| 5720 | btrfs_put_block_group(cache); |
| 5721 | cache = btrfs_lookup_block_group(fs_info, start); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5722 | BUG_ON(!cache); /* Logic error */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5723 | } |
| 5724 | |
| 5725 | len = cache->key.objectid + cache->key.offset - start; |
| 5726 | len = min(len, end + 1 - start); |
| 5727 | |
| 5728 | if (start < cache->last_byte_to_unpin) { |
| 5729 | len = min(len, cache->last_byte_to_unpin - start); |
| 5730 | btrfs_add_free_space(cache, start, len); |
| 5731 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5732 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5733 | start += len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5734 | space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5735 | |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5736 | spin_lock(&space_info->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5737 | spin_lock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5738 | cache->pinned -= len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5739 | space_info->bytes_pinned -= len; |
Liu Bo | d288db5 | 2014-07-02 16:58:01 +0800 | [diff] [blame] | 5740 | percpu_counter_add(&space_info->total_bytes_pinned, -len); |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5741 | if (cache->ro) { |
| 5742 | space_info->bytes_readonly += len; |
| 5743 | readonly = true; |
| 5744 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5745 | spin_unlock(&cache->lock); |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5746 | if (!readonly && global_rsv->space_info == space_info) { |
| 5747 | spin_lock(&global_rsv->lock); |
| 5748 | if (!global_rsv->full) { |
| 5749 | len = min(len, global_rsv->size - |
| 5750 | global_rsv->reserved); |
| 5751 | global_rsv->reserved += len; |
| 5752 | space_info->bytes_may_use += len; |
| 5753 | if (global_rsv->reserved >= global_rsv->size) |
| 5754 | global_rsv->full = 1; |
| 5755 | } |
| 5756 | spin_unlock(&global_rsv->lock); |
| 5757 | } |
| 5758 | spin_unlock(&space_info->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5759 | } |
| 5760 | |
| 5761 | if (cache) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5762 | btrfs_put_block_group(cache); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 5763 | return 0; |
| 5764 | } |
| 5765 | |
| 5766 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5767 | struct btrfs_root *root) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5768 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5769 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5770 | struct extent_io_tree *unpin; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5771 | u64 start; |
| 5772 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5773 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5774 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5775 | if (trans->aborted) |
| 5776 | return 0; |
| 5777 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5778 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 5779 | unpin = &fs_info->freed_extents[1]; |
| 5780 | else |
| 5781 | unpin = &fs_info->freed_extents[0]; |
| 5782 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5783 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5784 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 5785 | EXTENT_DIRTY, NULL); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5786 | if (ret) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5787 | break; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5788 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 5789 | if (btrfs_test_opt(root, DISCARD)) |
| 5790 | ret = btrfs_discard_extent(root, start, |
| 5791 | end + 1 - start, NULL); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5792 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5793 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5794 | unpin_extent_range(root, start, end); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5795 | cond_resched(); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5796 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 5797 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 5798 | return 0; |
| 5799 | } |
| 5800 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5801 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
| 5802 | u64 owner, u64 root_objectid) |
| 5803 | { |
| 5804 | struct btrfs_space_info *space_info; |
| 5805 | u64 flags; |
| 5806 | |
| 5807 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 5808 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) |
| 5809 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 5810 | else |
| 5811 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 5812 | } else { |
| 5813 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 5814 | } |
| 5815 | |
| 5816 | space_info = __find_space_info(fs_info, flags); |
| 5817 | BUG_ON(!space_info); /* Logic bug */ |
| 5818 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); |
| 5819 | } |
| 5820 | |
| 5821 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5822 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 5823 | struct btrfs_root *root, |
| 5824 | u64 bytenr, u64 num_bytes, u64 parent, |
| 5825 | u64 root_objectid, u64 owner_objectid, |
| 5826 | u64 owner_offset, int refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 5827 | struct btrfs_delayed_extent_op *extent_op, |
| 5828 | int no_quota) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5829 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 5830 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5831 | struct btrfs_path *path; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 5832 | struct btrfs_fs_info *info = root->fs_info; |
| 5833 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5834 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5835 | struct btrfs_extent_item *ei; |
| 5836 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5837 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5838 | int is_data; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5839 | int extent_slot = 0; |
| 5840 | int found_extent = 0; |
| 5841 | int num_to_del = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5842 | u32 item_size; |
| 5843 | u64 refs; |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 5844 | int last_ref = 0; |
| 5845 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_SUB_EXCL; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5846 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 5847 | SKINNY_METADATA); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 5848 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 5849 | if (!info->quota_enabled || !is_fstree(root_objectid)) |
| 5850 | no_quota = 1; |
| 5851 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 5852 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 5853 | if (!path) |
| 5854 | return -ENOMEM; |
| 5855 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 5856 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5857 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5858 | |
| 5859 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; |
| 5860 | BUG_ON(!is_data && refs_to_drop != 1); |
| 5861 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5862 | if (is_data) |
| 5863 | skinny_metadata = 0; |
| 5864 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5865 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
| 5866 | bytenr, num_bytes, parent, |
| 5867 | root_objectid, owner_objectid, |
| 5868 | owner_offset); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5869 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5870 | extent_slot = path->slots[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5871 | while (extent_slot >= 0) { |
| 5872 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5873 | extent_slot); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5874 | if (key.objectid != bytenr) |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5875 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5876 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
| 5877 | key.offset == num_bytes) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5878 | found_extent = 1; |
| 5879 | break; |
| 5880 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5881 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
| 5882 | key.offset == owner_objectid) { |
| 5883 | found_extent = 1; |
| 5884 | break; |
| 5885 | } |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5886 | if (path->slots[0] - extent_slot > 5) |
| 5887 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5888 | extent_slot--; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5889 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5890 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 5891 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); |
| 5892 | if (found_extent && item_size < sizeof(*ei)) |
| 5893 | found_extent = 0; |
| 5894 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5895 | if (!found_extent) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5896 | BUG_ON(iref); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 5897 | ret = remove_extent_backref(trans, extent_root, path, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5898 | NULL, refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 5899 | is_data, &last_ref); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5900 | if (ret) { |
| 5901 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5902 | goto out; |
| 5903 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5904 | btrfs_release_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5905 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5906 | |
| 5907 | key.objectid = bytenr; |
| 5908 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5909 | key.offset = num_bytes; |
| 5910 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5911 | if (!is_data && skinny_metadata) { |
| 5912 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 5913 | key.offset = owner_objectid; |
| 5914 | } |
| 5915 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5916 | ret = btrfs_search_slot(trans, extent_root, |
| 5917 | &key, path, -1, 1); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5918 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
| 5919 | /* |
| 5920 | * Couldn't find our skinny metadata item, |
| 5921 | * see if we have ye olde extent item. |
| 5922 | */ |
| 5923 | path->slots[0]--; |
| 5924 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 5925 | path->slots[0]); |
| 5926 | if (key.objectid == bytenr && |
| 5927 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 5928 | key.offset == num_bytes) |
| 5929 | ret = 0; |
| 5930 | } |
| 5931 | |
| 5932 | if (ret > 0 && skinny_metadata) { |
| 5933 | skinny_metadata = false; |
Filipe Manana | 9ce49a0 | 2014-04-24 15:15:28 +0100 | [diff] [blame] | 5934 | key.objectid = bytenr; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5935 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5936 | key.offset = num_bytes; |
| 5937 | btrfs_release_path(path); |
| 5938 | ret = btrfs_search_slot(trans, extent_root, |
| 5939 | &key, path, -1, 1); |
| 5940 | } |
| 5941 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5942 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5943 | 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] | 5944 | ret, bytenr); |
Josef Bacik | b783e62 | 2011-07-13 15:03:50 +0000 | [diff] [blame] | 5945 | if (ret > 0) |
| 5946 | btrfs_print_leaf(extent_root, |
| 5947 | path->nodes[0]); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5948 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5949 | if (ret < 0) { |
| 5950 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5951 | goto out; |
| 5952 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5953 | extent_slot = path->slots[0]; |
| 5954 | } |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 5955 | } else if (WARN_ON(ret == -ENOENT)) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5956 | btrfs_print_leaf(extent_root, path->nodes[0]); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5957 | btrfs_err(info, |
| 5958 | "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] | 5959 | bytenr, parent, root_objectid, owner_objectid, |
| 5960 | owner_offset); |
Josef Bacik | c4a050b | 2014-03-14 16:36:53 -0400 | [diff] [blame] | 5961 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5962 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5963 | } else { |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5964 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5965 | goto out; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5966 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5967 | |
| 5968 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5969 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 5970 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 5971 | if (item_size < sizeof(*ei)) { |
| 5972 | BUG_ON(found_extent || extent_slot != path->slots[0]); |
| 5973 | ret = convert_extent_item_v0(trans, extent_root, path, |
| 5974 | owner_objectid, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5975 | if (ret < 0) { |
| 5976 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5977 | goto out; |
| 5978 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5979 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5980 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5981 | path->leave_spinning = 1; |
| 5982 | |
| 5983 | key.objectid = bytenr; |
| 5984 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5985 | key.offset = num_bytes; |
| 5986 | |
| 5987 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 5988 | -1, 1); |
| 5989 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5990 | 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] | 5991 | ret, bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5992 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 5993 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5994 | if (ret < 0) { |
| 5995 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5996 | goto out; |
| 5997 | } |
| 5998 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5999 | extent_slot = path->slots[0]; |
| 6000 | leaf = path->nodes[0]; |
| 6001 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 6002 | } |
| 6003 | #endif |
| 6004 | BUG_ON(item_size < sizeof(*ei)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6005 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 6006 | struct btrfs_extent_item); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6007 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
| 6008 | key.type == BTRFS_EXTENT_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6009 | struct btrfs_tree_block_info *bi; |
| 6010 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
| 6011 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 6012 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6013 | } |
| 6014 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6015 | refs = btrfs_extent_refs(leaf, ei); |
Josef Bacik | 32b0253 | 2013-04-24 16:38:50 -0400 | [diff] [blame] | 6016 | if (refs < refs_to_drop) { |
| 6017 | 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] | 6018 | "for bytenr %Lu", refs_to_drop, refs, bytenr); |
Josef Bacik | 32b0253 | 2013-04-24 16:38:50 -0400 | [diff] [blame] | 6019 | ret = -EINVAL; |
| 6020 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6021 | goto out; |
| 6022 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6023 | refs -= refs_to_drop; |
| 6024 | |
| 6025 | if (refs > 0) { |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6026 | type = BTRFS_QGROUP_OPER_SUB_SHARED; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6027 | if (extent_op) |
| 6028 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 6029 | /* |
| 6030 | * In the case of inline back ref, reference count will |
| 6031 | * be updated by remove_extent_backref |
| 6032 | */ |
| 6033 | if (iref) { |
| 6034 | BUG_ON(!found_extent); |
| 6035 | } else { |
| 6036 | btrfs_set_extent_refs(leaf, ei, refs); |
| 6037 | btrfs_mark_buffer_dirty(leaf); |
| 6038 | } |
| 6039 | if (found_extent) { |
| 6040 | ret = remove_extent_backref(trans, extent_root, path, |
| 6041 | iref, refs_to_drop, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6042 | is_data, &last_ref); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6043 | if (ret) { |
| 6044 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6045 | goto out; |
| 6046 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6047 | } |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6048 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
| 6049 | root_objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6050 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6051 | if (found_extent) { |
| 6052 | BUG_ON(is_data && refs_to_drop != |
| 6053 | extent_data_ref_count(root, path, iref)); |
| 6054 | if (iref) { |
| 6055 | BUG_ON(path->slots[0] != extent_slot); |
| 6056 | } else { |
| 6057 | BUG_ON(path->slots[0] != extent_slot + 1); |
| 6058 | path->slots[0] = extent_slot; |
| 6059 | num_to_del = 2; |
| 6060 | } |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 6061 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6062 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6063 | last_ref = 1; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 6064 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 6065 | num_to_del); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6066 | if (ret) { |
| 6067 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6068 | goto out; |
| 6069 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 6070 | btrfs_release_path(path); |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 6071 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6072 | if (is_data) { |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 6073 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6074 | if (ret) { |
| 6075 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6076 | goto out; |
| 6077 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 6078 | } |
| 6079 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 6080 | ret = update_block_group(root, bytenr, num_bytes, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 6081 | if (ret) { |
| 6082 | btrfs_abort_transaction(trans, extent_root, ret); |
| 6083 | goto out; |
| 6084 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6085 | } |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6086 | btrfs_release_path(path); |
| 6087 | |
| 6088 | /* Deal with the quota accounting */ |
| 6089 | if (!ret && last_ref && !no_quota) { |
| 6090 | int mod_seq = 0; |
| 6091 | |
| 6092 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID && |
| 6093 | type == BTRFS_QGROUP_OPER_SUB_SHARED) |
| 6094 | mod_seq = 1; |
| 6095 | |
| 6096 | ret = btrfs_qgroup_record_ref(trans, info, root_objectid, |
| 6097 | bytenr, num_bytes, type, |
| 6098 | mod_seq); |
| 6099 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6100 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 6101 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 6102 | return ret; |
| 6103 | } |
| 6104 | |
| 6105 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6106 | * 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] | 6107 | * delayed ref for that extent as well. This searches the delayed ref tree for |
| 6108 | * a given extent, and if there are no other delayed refs to be processed, it |
| 6109 | * removes it from the tree. |
| 6110 | */ |
| 6111 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, |
| 6112 | struct btrfs_root *root, u64 bytenr) |
| 6113 | { |
| 6114 | struct btrfs_delayed_ref_head *head; |
| 6115 | struct btrfs_delayed_ref_root *delayed_refs; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6116 | int ret = 0; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6117 | |
| 6118 | delayed_refs = &trans->transaction->delayed_refs; |
| 6119 | spin_lock(&delayed_refs->lock); |
| 6120 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 6121 | if (!head) |
Chris Mason | cf93da7 | 2014-01-29 07:02:40 -0800 | [diff] [blame] | 6122 | goto out_delayed_unlock; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6123 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6124 | spin_lock(&head->lock); |
| 6125 | if (rb_first(&head->ref_root)) |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6126 | goto out; |
| 6127 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6128 | if (head->extent_op) { |
| 6129 | if (!head->must_insert_reserved) |
| 6130 | goto out; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 6131 | btrfs_free_delayed_extent_op(head->extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6132 | head->extent_op = NULL; |
| 6133 | } |
| 6134 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6135 | /* |
| 6136 | * waiting for the lock here would deadlock. If someone else has it |
| 6137 | * locked they are already in the process of dropping it anyway |
| 6138 | */ |
| 6139 | if (!mutex_trylock(&head->mutex)) |
| 6140 | goto out; |
| 6141 | |
| 6142 | /* |
| 6143 | * at this point we have a head with no other entries. Go |
| 6144 | * ahead and process it. |
| 6145 | */ |
| 6146 | head->node.in_tree = 0; |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 6147 | rb_erase(&head->href_node, &delayed_refs->href_root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6148 | |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6149 | atomic_dec(&delayed_refs->num_entries); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6150 | |
| 6151 | /* |
| 6152 | * we don't take a ref on the node because we're removing it from the |
| 6153 | * tree, so we just steal the ref the tree was holding. |
| 6154 | */ |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6155 | delayed_refs->num_heads--; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6156 | if (head->processing == 0) |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 6157 | delayed_refs->num_heads_ready--; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6158 | head->processing = 0; |
| 6159 | spin_unlock(&head->lock); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6160 | spin_unlock(&delayed_refs->lock); |
| 6161 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6162 | BUG_ON(head->extent_op); |
| 6163 | if (head->must_insert_reserved) |
| 6164 | ret = 1; |
| 6165 | |
| 6166 | mutex_unlock(&head->mutex); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6167 | btrfs_put_delayed_ref(&head->node); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6168 | return ret; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6169 | out: |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 6170 | spin_unlock(&head->lock); |
Chris Mason | cf93da7 | 2014-01-29 07:02:40 -0800 | [diff] [blame] | 6171 | |
| 6172 | out_delayed_unlock: |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 6173 | spin_unlock(&delayed_refs->lock); |
| 6174 | return 0; |
| 6175 | } |
| 6176 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6177 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
| 6178 | struct btrfs_root *root, |
| 6179 | struct extent_buffer *buf, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6180 | u64 parent, int last_ref) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6181 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6182 | struct btrfs_block_group_cache *cache = NULL; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6183 | int pin = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6184 | int ret; |
| 6185 | |
| 6186 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6187 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 6188 | buf->start, buf->len, |
| 6189 | parent, root->root_key.objectid, |
| 6190 | btrfs_header_level(buf), |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6191 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6192 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6193 | } |
| 6194 | |
| 6195 | if (!last_ref) |
| 6196 | return; |
| 6197 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6198 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6199 | |
| 6200 | if (btrfs_header_generation(buf) == trans->transid) { |
| 6201 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 6202 | ret = check_ref_cleanup(trans, root, buf->start); |
| 6203 | if (!ret) |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 6204 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6205 | } |
| 6206 | |
| 6207 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
| 6208 | pin_down_extent(root, cache, buf->start, buf->len, 1); |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 6209 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6210 | } |
| 6211 | |
| 6212 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); |
| 6213 | |
| 6214 | btrfs_add_free_space(cache, buf->start, buf->len); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6215 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE, 0); |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 6216 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6217 | pin = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6218 | } |
| 6219 | out: |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6220 | if (pin) |
| 6221 | add_pinned_bytes(root->fs_info, buf->len, |
| 6222 | btrfs_header_level(buf), |
| 6223 | root->root_key.objectid); |
| 6224 | |
Josef Bacik | a826d6d | 2011-03-16 13:42:43 -0400 | [diff] [blame] | 6225 | /* |
| 6226 | * Deleting the buffer, clear the corrupt flag since it doesn't matter |
| 6227 | * anymore. |
| 6228 | */ |
| 6229 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6230 | btrfs_put_block_group(cache); |
| 6231 | } |
| 6232 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6233 | /* Can return -ENOMEM */ |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6234 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 6235 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6236 | u64 owner, u64 offset, int no_quota) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6237 | { |
| 6238 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6239 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6240 | |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 6241 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| 6242 | if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) |
| 6243 | return 0; |
| 6244 | #endif |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6245 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
| 6246 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6247 | /* |
| 6248 | * tree log blocks never actually go into the extent allocation |
| 6249 | * tree, just update pinning info and exit early. |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6250 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6251 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 6252 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6253 | /* unlocks the pinned mutex */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6254 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6255 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6256 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6257 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 6258 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6259 | parent, root_objectid, (int)owner, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6260 | BTRFS_DROP_DELAYED_REF, NULL, no_quota); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6261 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6262 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 6263 | num_bytes, |
| 6264 | parent, root_objectid, owner, |
| 6265 | offset, BTRFS_DROP_DELAYED_REF, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 6266 | NULL, no_quota); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6267 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6268 | return ret; |
| 6269 | } |
| 6270 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6271 | static u64 stripe_align(struct btrfs_root *root, |
| 6272 | struct btrfs_block_group_cache *cache, |
| 6273 | u64 val, u64 num_bytes) |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 6274 | { |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 6275 | u64 ret = ALIGN(val, root->stripesize); |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 6276 | return ret; |
| 6277 | } |
| 6278 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6279 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6280 | * when we wait for progress in the block group caching, its because |
| 6281 | * our allocation attempt failed at least once. So, we must sleep |
| 6282 | * and let some progress happen before we try again. |
| 6283 | * |
| 6284 | * This function will sleep at least once waiting for new free space to |
| 6285 | * show up, and then it will check the block group free space numbers |
| 6286 | * for our min num_bytes. Another option is to have it go ahead |
| 6287 | * and look in the rbtree for a free extent of a given size, but this |
| 6288 | * is a good start. |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6289 | * |
| 6290 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using |
| 6291 | * any of the information in this block group. |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6292 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6293 | static noinline void |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6294 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
| 6295 | u64 num_bytes) |
| 6296 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6297 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6298 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6299 | caching_ctl = get_caching_control(cache); |
| 6300 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6301 | return; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6302 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6303 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 6304 | (cache->free_space_ctl->free_space >= num_bytes)); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6305 | |
| 6306 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6307 | } |
| 6308 | |
| 6309 | static noinline int |
| 6310 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 6311 | { |
| 6312 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6313 | int ret = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6314 | |
| 6315 | caching_ctl = get_caching_control(cache); |
| 6316 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6317 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6318 | |
| 6319 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6320 | if (cache->cached == BTRFS_CACHE_ERROR) |
| 6321 | ret = -EIO; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6322 | put_caching_control(caching_ctl); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6323 | return ret; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6324 | } |
| 6325 | |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6326 | int __get_raid_index(u64 flags) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6327 | { |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6328 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6329 | return BTRFS_RAID_RAID10; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6330 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6331 | return BTRFS_RAID_RAID1; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6332 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6333 | return BTRFS_RAID_DUP; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6334 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6335 | return BTRFS_RAID_RAID0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6336 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6337 | return BTRFS_RAID_RAID5; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6338 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6339 | return BTRFS_RAID_RAID6; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6340 | |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6341 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6342 | } |
| 6343 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6344 | int get_block_group_index(struct btrfs_block_group_cache *cache) |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6345 | { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6346 | return __get_raid_index(cache->flags); |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6347 | } |
| 6348 | |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6349 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { |
| 6350 | [BTRFS_RAID_RAID10] = "raid10", |
| 6351 | [BTRFS_RAID_RAID1] = "raid1", |
| 6352 | [BTRFS_RAID_DUP] = "dup", |
| 6353 | [BTRFS_RAID_RAID0] = "raid0", |
| 6354 | [BTRFS_RAID_SINGLE] = "single", |
| 6355 | [BTRFS_RAID_RAID5] = "raid5", |
| 6356 | [BTRFS_RAID_RAID6] = "raid6", |
| 6357 | }; |
| 6358 | |
Jeff Mahoney | 1b8e5df | 2013-11-20 16:50:23 -0500 | [diff] [blame] | 6359 | static const char *get_raid_name(enum btrfs_raid_types type) |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 6360 | { |
| 6361 | if (type >= BTRFS_NR_RAID_TYPES) |
| 6362 | return NULL; |
| 6363 | |
| 6364 | return btrfs_raid_type_names[type]; |
| 6365 | } |
| 6366 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6367 | enum btrfs_loop_type { |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6368 | LOOP_CACHING_NOWAIT = 0, |
| 6369 | LOOP_CACHING_WAIT = 1, |
| 6370 | LOOP_ALLOC_CHUNK = 2, |
| 6371 | LOOP_NO_EMPTY_SIZE = 3, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6372 | }; |
| 6373 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6374 | static inline void |
| 6375 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, |
| 6376 | int delalloc) |
| 6377 | { |
| 6378 | if (delalloc) |
| 6379 | down_read(&cache->data_rwsem); |
| 6380 | } |
| 6381 | |
| 6382 | static inline void |
| 6383 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, |
| 6384 | int delalloc) |
| 6385 | { |
| 6386 | btrfs_get_block_group(cache); |
| 6387 | if (delalloc) |
| 6388 | down_read(&cache->data_rwsem); |
| 6389 | } |
| 6390 | |
| 6391 | static struct btrfs_block_group_cache * |
| 6392 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, |
| 6393 | struct btrfs_free_cluster *cluster, |
| 6394 | int delalloc) |
| 6395 | { |
| 6396 | struct btrfs_block_group_cache *used_bg; |
| 6397 | bool locked = false; |
| 6398 | again: |
| 6399 | spin_lock(&cluster->refill_lock); |
| 6400 | if (locked) { |
| 6401 | if (used_bg == cluster->block_group) |
| 6402 | return used_bg; |
| 6403 | |
| 6404 | up_read(&used_bg->data_rwsem); |
| 6405 | btrfs_put_block_group(used_bg); |
| 6406 | } |
| 6407 | |
| 6408 | used_bg = cluster->block_group; |
| 6409 | if (!used_bg) |
| 6410 | return NULL; |
| 6411 | |
| 6412 | if (used_bg == block_group) |
| 6413 | return used_bg; |
| 6414 | |
| 6415 | btrfs_get_block_group(used_bg); |
| 6416 | |
| 6417 | if (!delalloc) |
| 6418 | return used_bg; |
| 6419 | |
| 6420 | if (down_read_trylock(&used_bg->data_rwsem)) |
| 6421 | return used_bg; |
| 6422 | |
| 6423 | spin_unlock(&cluster->refill_lock); |
| 6424 | down_read(&used_bg->data_rwsem); |
| 6425 | locked = true; |
| 6426 | goto again; |
| 6427 | } |
| 6428 | |
| 6429 | static inline void |
| 6430 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, |
| 6431 | int delalloc) |
| 6432 | { |
| 6433 | if (delalloc) |
| 6434 | up_read(&cache->data_rwsem); |
| 6435 | btrfs_put_block_group(cache); |
| 6436 | } |
| 6437 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6438 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6439 | * walks the btree of allocated extents and find a hole of a given size. |
| 6440 | * The key ins is changed to record the hole: |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6441 | * ins->objectid == start position |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 6442 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6443 | * ins->offset == the size of the hole. |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6444 | * Any available blocks before search_start are skipped. |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6445 | * |
| 6446 | * If there is no suitable free space, we will record the max size of |
| 6447 | * the free space extent currently. |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6448 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6449 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6450 | u64 num_bytes, u64 empty_size, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6451 | u64 hint_byte, struct btrfs_key *ins, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6452 | u64 flags, int delalloc) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6453 | { |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6454 | int ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6455 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6456 | struct btrfs_free_cluster *last_ptr = NULL; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6457 | struct btrfs_block_group_cache *block_group = NULL; |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 6458 | u64 search_start = 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6459 | u64 max_extent_size = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6460 | int empty_cluster = 2 * 1024 * 1024; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6461 | struct btrfs_space_info *space_info; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6462 | int loop = 0; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6463 | int index = __get_raid_index(flags); |
| 6464 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6465 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6466 | bool failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6467 | bool failed_alloc = false; |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6468 | bool use_cluster = true; |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6469 | bool have_caching_bg = false; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6470 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 6471 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 6472 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6473 | ins->objectid = 0; |
| 6474 | ins->offset = 0; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 6475 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6476 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6477 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6478 | space_info = __find_space_info(root->fs_info, flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6479 | if (!space_info) { |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6480 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6481 | return -ENOSPC; |
| 6482 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6483 | |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6484 | /* |
| 6485 | * If the space info is for both data and metadata it means we have a |
| 6486 | * small filesystem and we can't use the clustering stuff. |
| 6487 | */ |
| 6488 | if (btrfs_mixed_space_info(space_info)) |
| 6489 | use_cluster = false; |
| 6490 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6491 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6492 | last_ptr = &root->fs_info->meta_alloc_cluster; |
Chris Mason | 536ac8a | 2009-02-12 09:41:38 -0500 | [diff] [blame] | 6493 | if (!btrfs_test_opt(root, SSD)) |
| 6494 | empty_cluster = 64 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6495 | } |
| 6496 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6497 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6498 | btrfs_test_opt(root, SSD)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6499 | last_ptr = &root->fs_info->data_alloc_cluster; |
| 6500 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6501 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6502 | if (last_ptr) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6503 | spin_lock(&last_ptr->lock); |
| 6504 | if (last_ptr->block_group) |
| 6505 | hint_byte = last_ptr->window_start; |
| 6506 | spin_unlock(&last_ptr->lock); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6507 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6508 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 6509 | search_start = max(search_start, first_logical_byte(root, 0)); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6510 | search_start = max(search_start, hint_byte); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6511 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6512 | if (!last_ptr) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6513 | empty_cluster = 0; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6514 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6515 | if (search_start == hint_byte) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6516 | block_group = btrfs_lookup_block_group(root->fs_info, |
| 6517 | search_start); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6518 | /* |
| 6519 | * we don't want to use the block group if it doesn't match our |
| 6520 | * allocation bits, or if its not cached. |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6521 | * |
| 6522 | * However if we are re-searching with an ideal block group |
| 6523 | * 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] | 6524 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6525 | if (block_group && block_group_bits(block_group, flags) && |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6526 | block_group->cached != BTRFS_CACHE_NO) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6527 | down_read(&space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6528 | if (list_empty(&block_group->list) || |
| 6529 | block_group->ro) { |
| 6530 | /* |
| 6531 | * someone is removing this block group, |
| 6532 | * we can't jump into the have_block_group |
| 6533 | * target because our list pointers are not |
| 6534 | * valid |
| 6535 | */ |
| 6536 | btrfs_put_block_group(block_group); |
| 6537 | up_read(&space_info->groups_sem); |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6538 | } else { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6539 | index = get_block_group_index(block_group); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6540 | btrfs_lock_block_group(block_group, delalloc); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6541 | goto have_block_group; |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6542 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6543 | } else if (block_group) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6544 | btrfs_put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6545 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6546 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6547 | search: |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6548 | have_caching_bg = false; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6549 | down_read(&space_info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6550 | list_for_each_entry(block_group, &space_info->block_groups[index], |
| 6551 | list) { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6552 | u64 offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6553 | int cached; |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 6554 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6555 | btrfs_grab_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6556 | search_start = block_group->key.objectid; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6557 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6558 | /* |
| 6559 | * this can happen if we end up cycling through all the |
| 6560 | * raid types, but we want to make sure we only allocate |
| 6561 | * for the proper type. |
| 6562 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6563 | if (!block_group_bits(block_group, flags)) { |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6564 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
| 6565 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6566 | BTRFS_BLOCK_GROUP_RAID5 | |
| 6567 | BTRFS_BLOCK_GROUP_RAID6 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6568 | BTRFS_BLOCK_GROUP_RAID10; |
| 6569 | |
| 6570 | /* |
| 6571 | * if they asked for extra copies and this block group |
| 6572 | * doesn't provide them, bail. This does allow us to |
| 6573 | * fill raid0 from raid1. |
| 6574 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6575 | if ((flags & extra) && !(block_group->flags & extra)) |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6576 | goto loop; |
| 6577 | } |
| 6578 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6579 | have_block_group: |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 6580 | cached = block_group_cache_done(block_group); |
| 6581 | if (unlikely(!cached)) { |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 6582 | ret = cache_block_group(block_group, 0); |
Chris Mason | 1d4284b | 2012-03-28 20:31:37 -0400 | [diff] [blame] | 6583 | BUG_ON(ret < 0); |
| 6584 | ret = 0; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6585 | } |
| 6586 | |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6587 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
| 6588 | goto loop; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6589 | if (unlikely(block_group->ro)) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6590 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6591 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6592 | /* |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6593 | * Ok we want to try and use the cluster allocator, so |
| 6594 | * lets look there |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6595 | */ |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6596 | if (last_ptr) { |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6597 | struct btrfs_block_group_cache *used_block_group; |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6598 | unsigned long aligned_cluster; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6599 | /* |
| 6600 | * the refill lock keeps out other |
| 6601 | * people trying to start a new cluster |
| 6602 | */ |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6603 | used_block_group = btrfs_lock_cluster(block_group, |
| 6604 | last_ptr, |
| 6605 | delalloc); |
| 6606 | if (!used_block_group) |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6607 | goto refill_cluster; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6608 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6609 | if (used_block_group != block_group && |
| 6610 | (used_block_group->ro || |
| 6611 | !block_group_bits(used_block_group, flags))) |
| 6612 | goto release_cluster; |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6613 | |
| 6614 | offset = btrfs_alloc_from_cluster(used_block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6615 | last_ptr, |
| 6616 | num_bytes, |
| 6617 | used_block_group->key.objectid, |
| 6618 | &max_extent_size); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6619 | if (offset) { |
| 6620 | /* we have a block, we're done */ |
| 6621 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6622 | trace_btrfs_reserve_extent_cluster(root, |
Miao Xie | 89d4346 | 2014-01-15 20:00:57 +0800 | [diff] [blame] | 6623 | used_block_group, |
| 6624 | search_start, num_bytes); |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6625 | if (used_block_group != block_group) { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6626 | btrfs_release_block_group(block_group, |
| 6627 | delalloc); |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6628 | block_group = used_block_group; |
| 6629 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6630 | goto checks; |
| 6631 | } |
| 6632 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6633 | WARN_ON(last_ptr->block_group != used_block_group); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6634 | release_cluster: |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6635 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
| 6636 | * set up a new clusters, so lets just skip it |
| 6637 | * and let the allocator find whatever block |
| 6638 | * it can find. If we reach this point, we |
| 6639 | * will have tried the cluster allocator |
| 6640 | * plenty of times and not have found |
| 6641 | * anything, so we are likely way too |
| 6642 | * fragmented for the clustering stuff to find |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6643 | * anything. |
| 6644 | * |
| 6645 | * However, if the cluster is taken from the |
| 6646 | * current block group, release the cluster |
| 6647 | * first, so that we stand a better chance of |
| 6648 | * succeeding in the unclustered |
| 6649 | * allocation. */ |
| 6650 | if (loop >= LOOP_NO_EMPTY_SIZE && |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6651 | used_block_group != block_group) { |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6652 | spin_unlock(&last_ptr->refill_lock); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6653 | btrfs_release_block_group(used_block_group, |
| 6654 | delalloc); |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6655 | goto unclustered_alloc; |
| 6656 | } |
| 6657 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6658 | /* |
| 6659 | * this cluster didn't work out, free it and |
| 6660 | * start over |
| 6661 | */ |
| 6662 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
| 6663 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6664 | if (used_block_group != block_group) |
| 6665 | btrfs_release_block_group(used_block_group, |
| 6666 | delalloc); |
| 6667 | refill_cluster: |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6668 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
| 6669 | spin_unlock(&last_ptr->refill_lock); |
| 6670 | goto unclustered_alloc; |
| 6671 | } |
| 6672 | |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6673 | aligned_cluster = max_t(unsigned long, |
| 6674 | empty_cluster + empty_size, |
| 6675 | block_group->full_stripe_len); |
| 6676 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6677 | /* allocate a cluster in this block group */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6678 | ret = btrfs_find_space_cluster(root, block_group, |
| 6679 | last_ptr, search_start, |
| 6680 | num_bytes, |
| 6681 | aligned_cluster); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6682 | if (ret == 0) { |
| 6683 | /* |
| 6684 | * now pull our allocation out of this |
| 6685 | * cluster |
| 6686 | */ |
| 6687 | offset = btrfs_alloc_from_cluster(block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6688 | last_ptr, |
| 6689 | num_bytes, |
| 6690 | search_start, |
| 6691 | &max_extent_size); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6692 | if (offset) { |
| 6693 | /* we found one, proceed */ |
| 6694 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6695 | trace_btrfs_reserve_extent_cluster(root, |
| 6696 | block_group, search_start, |
| 6697 | num_bytes); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6698 | goto checks; |
| 6699 | } |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6700 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
| 6701 | && !failed_cluster_refill) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6702 | spin_unlock(&last_ptr->refill_lock); |
| 6703 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6704 | failed_cluster_refill = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6705 | wait_block_group_cache_progress(block_group, |
| 6706 | num_bytes + empty_cluster + empty_size); |
| 6707 | goto have_block_group; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6708 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6709 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6710 | /* |
| 6711 | * at this point we either didn't find a cluster |
| 6712 | * or we weren't able to allocate a block from our |
| 6713 | * cluster. Free the cluster we've been trying |
| 6714 | * to use, and go to the next block group |
| 6715 | */ |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6716 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6717 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6718 | goto loop; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6719 | } |
| 6720 | |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6721 | unclustered_alloc: |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6722 | spin_lock(&block_group->free_space_ctl->tree_lock); |
| 6723 | if (cached && |
| 6724 | block_group->free_space_ctl->free_space < |
| 6725 | num_bytes + empty_cluster + empty_size) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6726 | if (block_group->free_space_ctl->free_space > |
| 6727 | max_extent_size) |
| 6728 | max_extent_size = |
| 6729 | block_group->free_space_ctl->free_space; |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6730 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6731 | goto loop; |
| 6732 | } |
| 6733 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6734 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6735 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6736 | num_bytes, empty_size, |
| 6737 | &max_extent_size); |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6738 | /* |
| 6739 | * If we didn't find a chunk, and we haven't failed on this |
| 6740 | * block group before, and this block group is in the middle of |
| 6741 | * caching and we are ok with waiting, then go ahead and wait |
| 6742 | * for progress to be made, and set failed_alloc to true. |
| 6743 | * |
| 6744 | * If failed_alloc is true then we've already waited on this |
| 6745 | * block group once and should move on to the next block group. |
| 6746 | */ |
| 6747 | if (!offset && !failed_alloc && !cached && |
| 6748 | loop > LOOP_CACHING_NOWAIT) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6749 | wait_block_group_cache_progress(block_group, |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6750 | num_bytes + empty_size); |
| 6751 | failed_alloc = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6752 | goto have_block_group; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6753 | } else if (!offset) { |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6754 | if (!cached) |
| 6755 | have_caching_bg = true; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6756 | goto loop; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6757 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6758 | checks: |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6759 | search_start = stripe_align(root, block_group, |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6760 | offset, num_bytes); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 6761 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6762 | /* move on to the next group */ |
| 6763 | if (search_start + num_bytes > |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6764 | block_group->key.objectid + block_group->key.offset) { |
| 6765 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6766 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6767 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6768 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6769 | if (offset < search_start) |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6770 | btrfs_add_free_space(block_group, offset, |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6771 | search_start - offset); |
| 6772 | BUG_ON(offset > search_start); |
| 6773 | |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6774 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6775 | alloc_type, delalloc); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6776 | if (ret == -EAGAIN) { |
Miao Xie | 215a63d | 2014-01-15 20:00:56 +0800 | [diff] [blame] | 6777 | btrfs_add_free_space(block_group, offset, num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6778 | goto loop; |
| 6779 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6780 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6781 | /* we are all good, lets return */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6782 | ins->objectid = search_start; |
| 6783 | ins->offset = num_bytes; |
| 6784 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6785 | trace_btrfs_reserve_extent(orig_root, block_group, |
| 6786 | search_start, num_bytes); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6787 | btrfs_release_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6788 | break; |
| 6789 | loop: |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6790 | failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6791 | failed_alloc = false; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6792 | BUG_ON(index != get_block_group_index(block_group)); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6793 | btrfs_release_block_group(block_group, delalloc); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6794 | } |
| 6795 | up_read(&space_info->groups_sem); |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 6796 | |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6797 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
| 6798 | goto search; |
| 6799 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6800 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
| 6801 | goto search; |
| 6802 | |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6803 | /* |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6804 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
| 6805 | * caching kthreads as we move along |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6806 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
| 6807 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again |
| 6808 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try |
| 6809 | * again |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6810 | */ |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6811 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6812 | index = 0; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6813 | loop++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6814 | if (loop == LOOP_ALLOC_CHUNK) { |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6815 | struct btrfs_trans_handle *trans; |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 6816 | int exist = 0; |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6817 | |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 6818 | trans = current->journal_info; |
| 6819 | if (trans) |
| 6820 | exist = 1; |
| 6821 | else |
| 6822 | trans = btrfs_join_transaction(root); |
| 6823 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6824 | if (IS_ERR(trans)) { |
| 6825 | ret = PTR_ERR(trans); |
| 6826 | goto out; |
| 6827 | } |
| 6828 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6829 | ret = do_chunk_alloc(trans, root, flags, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6830 | CHUNK_ALLOC_FORCE); |
| 6831 | /* |
| 6832 | * Do not bail out on ENOSPC since we |
| 6833 | * can do more things. |
| 6834 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6835 | if (ret < 0 && ret != -ENOSPC) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6836 | btrfs_abort_transaction(trans, |
| 6837 | root, ret); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6838 | else |
| 6839 | ret = 0; |
Wang Shilong | f017f15 | 2014-03-13 13:19:47 +0800 | [diff] [blame] | 6840 | if (!exist) |
| 6841 | btrfs_end_transaction(trans, root); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6842 | if (ret) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6843 | goto out; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6844 | } |
| 6845 | |
| 6846 | if (loop == LOOP_NO_EMPTY_SIZE) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6847 | empty_size = 0; |
| 6848 | empty_cluster = 0; |
| 6849 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6850 | |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6851 | goto search; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6852 | } else if (!ins->objectid) { |
| 6853 | ret = -ENOSPC; |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 6854 | } else if (ins->objectid) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6855 | ret = 0; |
| 6856 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6857 | out: |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6858 | if (ret == -ENOSPC) |
| 6859 | ins->offset = max_extent_size; |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 6860 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6861 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 6862 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6863 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 6864 | int dump_block_groups) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6865 | { |
| 6866 | struct btrfs_block_group_cache *cache; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6867 | int index = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6868 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6869 | spin_lock(&info->lock); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 6870 | 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] | 6871 | info->flags, |
| 6872 | info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 6873 | info->bytes_reserved - info->bytes_readonly, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6874 | (info->full) ? "" : "not "); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 6875 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6876 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6877 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
| 6878 | info->bytes_reserved, info->bytes_may_use, |
| 6879 | info->bytes_readonly); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6880 | spin_unlock(&info->lock); |
| 6881 | |
| 6882 | if (!dump_block_groups) |
| 6883 | return; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6884 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6885 | down_read(&info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6886 | again: |
| 6887 | list_for_each_entry(cache, &info->block_groups[index], list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6888 | spin_lock(&cache->lock); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 6889 | printk(KERN_INFO "BTRFS: " |
| 6890 | "block group %llu has %llu bytes, " |
| 6891 | "%llu used %llu pinned %llu reserved %s\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6892 | cache->key.objectid, cache->key.offset, |
| 6893 | btrfs_block_group_used(&cache->item), cache->pinned, |
| 6894 | cache->reserved, cache->ro ? "[readonly]" : ""); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6895 | btrfs_dump_free_space(cache, bytes); |
| 6896 | spin_unlock(&cache->lock); |
| 6897 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6898 | if (++index < BTRFS_NR_RAID_TYPES) |
| 6899 | goto again; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6900 | up_read(&info->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6901 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 6902 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6903 | int btrfs_reserve_extent(struct btrfs_root *root, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6904 | u64 num_bytes, u64 min_alloc_size, |
| 6905 | u64 empty_size, u64 hint_byte, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6906 | struct btrfs_key *ins, int is_data, int delalloc) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6907 | { |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6908 | bool final_tried = false; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6909 | u64 flags; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6910 | int ret; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6911 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6912 | flags = btrfs_get_alloc_profile(root, is_data); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 6913 | again: |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 6914 | WARN_ON(num_bytes < root->sectorsize); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6915 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6916 | flags, delalloc); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 6917 | |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6918 | if (ret == -ENOSPC) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 6919 | if (!final_tried && ins->offset) { |
| 6920 | num_bytes = min(num_bytes >> 1, ins->offset); |
Zach Brown | 24542bf | 2012-11-16 00:04:43 +0000 | [diff] [blame] | 6921 | num_bytes = round_down(num_bytes, root->sectorsize); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6922 | num_bytes = max(num_bytes, min_alloc_size); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6923 | if (num_bytes == min_alloc_size) |
| 6924 | final_tried = true; |
| 6925 | goto again; |
| 6926 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 6927 | struct btrfs_space_info *sinfo; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6928 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6929 | sinfo = __find_space_info(root->fs_info, flags); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6930 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6931 | flags, num_bytes); |
Jeff Mahoney | 5380428 | 2012-03-01 14:56:28 +0100 | [diff] [blame] | 6932 | if (sinfo) |
| 6933 | dump_space_info(sinfo, num_bytes, 1); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6934 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6935 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6936 | |
| 6937 | return ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6938 | } |
| 6939 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6940 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6941 | u64 start, u64 len, |
| 6942 | int pin, int delalloc) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6943 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6944 | struct btrfs_block_group_cache *cache; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6945 | int ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6946 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6947 | cache = btrfs_lookup_block_group(root->fs_info, start); |
| 6948 | if (!cache) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6949 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6950 | start); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6951 | return -ENOSPC; |
| 6952 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6953 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 6954 | if (btrfs_test_opt(root, DISCARD)) |
| 6955 | ret = btrfs_discard_extent(root, start, len, NULL); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6956 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6957 | if (pin) |
| 6958 | pin_down_extent(root, cache, start, len, 1); |
| 6959 | else { |
| 6960 | btrfs_add_free_space(cache, start, len); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6961 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6962 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6963 | btrfs_put_block_group(cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6964 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 6965 | trace_btrfs_reserved_extent_free(root, start, len); |
| 6966 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6967 | return ret; |
| 6968 | } |
| 6969 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6970 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6971 | u64 start, u64 len, int delalloc) |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6972 | { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6973 | return __btrfs_free_reserved_extent(root, start, len, 0, delalloc); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6974 | } |
| 6975 | |
| 6976 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, |
| 6977 | u64 start, u64 len) |
| 6978 | { |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 6979 | return __btrfs_free_reserved_extent(root, start, len, 1, 0); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6980 | } |
| 6981 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6982 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 6983 | struct btrfs_root *root, |
| 6984 | u64 parent, u64 root_objectid, |
| 6985 | u64 flags, u64 owner, u64 offset, |
| 6986 | struct btrfs_key *ins, int ref_mod) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6987 | { |
| 6988 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6989 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6990 | struct btrfs_extent_item *extent_item; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6991 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6992 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6993 | struct extent_buffer *leaf; |
| 6994 | int type; |
| 6995 | u32 size; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 6996 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6997 | if (parent > 0) |
| 6998 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 6999 | else |
| 7000 | type = BTRFS_EXTENT_DATA_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 7001 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7002 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 7003 | |
| 7004 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 7005 | if (!path) |
| 7006 | return -ENOMEM; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7007 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 7008 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7009 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 7010 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7011 | if (ret) { |
| 7012 | btrfs_free_path(path); |
| 7013 | return ret; |
| 7014 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 7015 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7016 | leaf = path->nodes[0]; |
| 7017 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7018 | struct btrfs_extent_item); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7019 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
| 7020 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 7021 | btrfs_set_extent_flags(leaf, extent_item, |
| 7022 | flags | BTRFS_EXTENT_FLAG_DATA); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7023 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7024 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
| 7025 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 7026 | if (parent > 0) { |
| 7027 | struct btrfs_shared_data_ref *ref; |
| 7028 | ref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 7029 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 7030 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); |
| 7031 | } else { |
| 7032 | struct btrfs_extent_data_ref *ref; |
| 7033 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 7034 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); |
| 7035 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 7036 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 7037 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); |
| 7038 | } |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 7039 | |
| 7040 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 7041 | btrfs_free_path(path); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 7042 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7043 | /* Always set parent to 0 here since its exclusive anyway. */ |
| 7044 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 7045 | ins->objectid, ins->offset, |
| 7046 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); |
| 7047 | if (ret) |
| 7048 | return ret; |
| 7049 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 7050 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7051 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7052 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7053 | ins->objectid, ins->offset); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 7054 | BUG(); |
| 7055 | } |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 7056 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7057 | return ret; |
| 7058 | } |
| 7059 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7060 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 7061 | struct btrfs_root *root, |
| 7062 | u64 parent, u64 root_objectid, |
| 7063 | u64 flags, struct btrfs_disk_key *key, |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7064 | int level, struct btrfs_key *ins, |
| 7065 | int no_quota) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7066 | { |
| 7067 | int ret; |
| 7068 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 7069 | struct btrfs_extent_item *extent_item; |
| 7070 | struct btrfs_tree_block_info *block_info; |
| 7071 | struct btrfs_extent_inline_ref *iref; |
| 7072 | struct btrfs_path *path; |
| 7073 | struct extent_buffer *leaf; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7074 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7075 | u64 num_bytes = ins->offset; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7076 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 7077 | SKINNY_METADATA); |
| 7078 | |
| 7079 | if (!skinny_metadata) |
| 7080 | size += sizeof(*block_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7081 | |
| 7082 | path = btrfs_alloc_path(); |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7083 | if (!path) { |
| 7084 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
| 7085 | root->leafsize); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 7086 | return -ENOMEM; |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7087 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7088 | |
| 7089 | path->leave_spinning = 1; |
| 7090 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 7091 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7092 | if (ret) { |
Josef Bacik | 857cc2f | 2013-10-07 15:21:08 -0400 | [diff] [blame] | 7093 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
| 7094 | root->leafsize); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7095 | btrfs_free_path(path); |
| 7096 | return ret; |
| 7097 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7098 | |
| 7099 | leaf = path->nodes[0]; |
| 7100 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
| 7101 | struct btrfs_extent_item); |
| 7102 | btrfs_set_extent_refs(leaf, extent_item, 1); |
| 7103 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 7104 | btrfs_set_extent_flags(leaf, extent_item, |
| 7105 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7106 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7107 | if (skinny_metadata) { |
| 7108 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7109 | num_bytes = root->leafsize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7110 | } else { |
| 7111 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); |
| 7112 | btrfs_set_tree_block_key(leaf, block_info, key); |
| 7113 | btrfs_set_tree_block_level(leaf, block_info, level); |
| 7114 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); |
| 7115 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7116 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7117 | if (parent > 0) { |
| 7118 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); |
| 7119 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 7120 | BTRFS_SHARED_BLOCK_REF_KEY); |
| 7121 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 7122 | } else { |
| 7123 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 7124 | BTRFS_TREE_BLOCK_REF_KEY); |
| 7125 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 7126 | } |
| 7127 | |
| 7128 | btrfs_mark_buffer_dirty(leaf); |
| 7129 | btrfs_free_path(path); |
| 7130 | |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 7131 | if (!no_quota) { |
| 7132 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, |
| 7133 | ins->objectid, num_bytes, |
| 7134 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); |
| 7135 | if (ret) |
| 7136 | return ret; |
| 7137 | } |
| 7138 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7139 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7140 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7141 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 7142 | ins->objectid, ins->offset); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7143 | BUG(); |
| 7144 | } |
Josef Bacik | 0be5dc6 | 2013-10-07 15:18:52 -0400 | [diff] [blame] | 7145 | |
| 7146 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->leafsize); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7147 | return ret; |
| 7148 | } |
| 7149 | |
| 7150 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 7151 | struct btrfs_root *root, |
| 7152 | u64 root_objectid, u64 owner, |
| 7153 | u64 offset, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7154 | { |
| 7155 | int ret; |
Chris Mason | 1c2308f | 2008-09-23 13:14:13 -0400 | [diff] [blame] | 7156 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7157 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 7158 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7159 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
| 7160 | ins->offset, 0, |
| 7161 | root_objectid, owner, offset, |
| 7162 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7163 | return ret; |
| 7164 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7165 | |
| 7166 | /* |
| 7167 | * this is used by the tree logging recovery code. It records that |
| 7168 | * an extent has been allocated and makes sure to clear the free |
| 7169 | * space cache bits as well |
| 7170 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7171 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
| 7172 | struct btrfs_root *root, |
| 7173 | u64 root_objectid, u64 owner, u64 offset, |
| 7174 | struct btrfs_key *ins) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7175 | { |
| 7176 | int ret; |
| 7177 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 7178 | |
| 7179 | /* |
| 7180 | * Mixed block groups will exclude before processing the log so we only |
| 7181 | * need to do the exlude dance if this fs isn't mixed. |
| 7182 | */ |
| 7183 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { |
| 7184 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); |
| 7185 | if (ret) |
| 7186 | return ret; |
| 7187 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7188 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7189 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 7190 | if (!block_group) |
| 7191 | return -EINVAL; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 7192 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 7193 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7194 | RESERVE_ALLOC_NO_ACCOUNT, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7195 | BUG_ON(ret); /* logic error */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7196 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
| 7197 | 0, owner, offset, ins, 1); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 7198 | btrfs_put_block_group(block_group); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7199 | return ret; |
| 7200 | } |
| 7201 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 7202 | static struct extent_buffer * |
| 7203 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 7204 | u64 bytenr, u32 blocksize, int level) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7205 | { |
| 7206 | struct extent_buffer *buf; |
| 7207 | |
| 7208 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 7209 | if (!buf) |
| 7210 | return ERR_PTR(-ENOMEM); |
| 7211 | btrfs_set_header_generation(buf, trans->transid); |
Chris Mason | 85d4e46 | 2011-07-26 16:11:19 -0400 | [diff] [blame] | 7212 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7213 | btrfs_tree_lock(buf); |
| 7214 | clean_tree_block(trans, root, buf); |
Josef Bacik | 3083ee2 | 2012-03-09 16:01:49 -0500 | [diff] [blame] | 7215 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7216 | |
| 7217 | btrfs_set_lock_blocking(buf); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7218 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7219 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 7220 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 7221 | /* |
| 7222 | * we allow two log transactions at a time, use different |
| 7223 | * EXENT bit to differentiate dirty pages. |
| 7224 | */ |
| 7225 | if (root->log_transid % 2 == 0) |
| 7226 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
| 7227 | buf->start + buf->len - 1, GFP_NOFS); |
| 7228 | else |
| 7229 | set_extent_new(&root->dirty_log_pages, buf->start, |
| 7230 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 7231 | } else { |
| 7232 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 7233 | buf->start + buf->len - 1, GFP_NOFS); |
| 7234 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7235 | trans->blocks_used++; |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 7236 | /* this returns a buffer locked for blocking */ |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 7237 | return buf; |
| 7238 | } |
| 7239 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7240 | static struct btrfs_block_rsv * |
| 7241 | use_block_rsv(struct btrfs_trans_handle *trans, |
| 7242 | struct btrfs_root *root, u32 blocksize) |
| 7243 | { |
| 7244 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 68a8227 | 2011-01-24 21:43:20 +0000 | [diff] [blame] | 7245 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7246 | int ret; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7247 | bool global_updated = false; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7248 | |
| 7249 | block_rsv = get_block_rsv(trans, root); |
| 7250 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7251 | if (unlikely(block_rsv->size == 0)) |
| 7252 | goto try_reserve; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7253 | again: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7254 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
| 7255 | if (!ret) |
| 7256 | return block_rsv; |
| 7257 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7258 | if (block_rsv->failfast) |
| 7259 | return ERR_PTR(ret); |
| 7260 | |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 7261 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
| 7262 | global_updated = true; |
| 7263 | update_global_block_rsv(root->fs_info); |
| 7264 | goto again; |
| 7265 | } |
| 7266 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7267 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 7268 | static DEFINE_RATELIMIT_STATE(_rs, |
| 7269 | DEFAULT_RATELIMIT_INTERVAL * 10, |
| 7270 | /*DEFAULT_RATELIMIT_BURST*/ 1); |
| 7271 | if (__ratelimit(&_rs)) |
| 7272 | WARN(1, KERN_DEBUG |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 7273 | "BTRFS: block rsv returned %d\n", ret); |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7274 | } |
| 7275 | try_reserve: |
| 7276 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
| 7277 | BTRFS_RESERVE_NO_FLUSH); |
| 7278 | if (!ret) |
| 7279 | return block_rsv; |
| 7280 | /* |
| 7281 | * If we couldn't reserve metadata bytes try and use some from |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 7282 | * the global reserve if its space type is the same as the global |
| 7283 | * reservation. |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7284 | */ |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 7285 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
| 7286 | block_rsv->space_info == global_rsv->space_info) { |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 7287 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
| 7288 | if (!ret) |
| 7289 | return global_rsv; |
| 7290 | } |
| 7291 | return ERR_PTR(ret); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7292 | } |
| 7293 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7294 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
| 7295 | struct btrfs_block_rsv *block_rsv, u32 blocksize) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7296 | { |
| 7297 | block_rsv_add_bytes(block_rsv, blocksize, 0); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7298 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7299 | } |
| 7300 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7301 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7302 | * finds a free extent and does all the dirty work required for allocation |
| 7303 | * returns the key for the extent through ins, and a tree buffer for |
| 7304 | * the first block of the extent through buf. |
| 7305 | * |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7306 | * returns the tree buffer or NULL. |
| 7307 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7308 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7309 | struct btrfs_root *root, u32 blocksize, |
| 7310 | u64 parent, u64 root_objectid, |
| 7311 | struct btrfs_disk_key *key, int level, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7312 | u64 hint, u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7313 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 7314 | struct btrfs_key ins; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7315 | struct btrfs_block_rsv *block_rsv; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7316 | struct extent_buffer *buf; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7317 | u64 flags = 0; |
| 7318 | int ret; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7319 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 7320 | SKINNY_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7321 | |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 7322 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| 7323 | if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) { |
| 7324 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, |
| 7325 | blocksize, level); |
| 7326 | if (!IS_ERR(buf)) |
| 7327 | root->alloc_bytenr += blocksize; |
| 7328 | return buf; |
| 7329 | } |
| 7330 | #endif |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7331 | block_rsv = use_block_rsv(trans, root, blocksize); |
| 7332 | if (IS_ERR(block_rsv)) |
| 7333 | return ERR_CAST(block_rsv); |
| 7334 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 7335 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 7336 | empty_size, hint, &ins, 0, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7337 | if (ret) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 7338 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7339 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7340 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 7341 | |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 7342 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
| 7343 | blocksize, level); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7344 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7345 | |
| 7346 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| 7347 | if (parent == 0) |
| 7348 | parent = ins.objectid; |
| 7349 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7350 | } else |
| 7351 | BUG_ON(parent > 0); |
| 7352 | |
| 7353 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 7354 | struct btrfs_delayed_extent_op *extent_op; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 7355 | extent_op = btrfs_alloc_delayed_extent_op(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7356 | BUG_ON(!extent_op); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7357 | if (key) |
| 7358 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); |
| 7359 | else |
| 7360 | memset(&extent_op->key, 0, sizeof(extent_op->key)); |
| 7361 | extent_op->flags_to_set = flags; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7362 | if (skinny_metadata) |
| 7363 | extent_op->update_key = 0; |
| 7364 | else |
| 7365 | extent_op->update_key = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7366 | extent_op->update_flags = 1; |
| 7367 | extent_op->is_data = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 7368 | extent_op->level = level; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7369 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7370 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 7371 | ins.objectid, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7372 | ins.offset, parent, root_objectid, |
| 7373 | level, BTRFS_ADD_DELAYED_EXTENT, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7374 | extent_op, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7375 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7376 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7377 | return buf; |
| 7378 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 7379 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7380 | struct walk_control { |
| 7381 | u64 refs[BTRFS_MAX_LEVEL]; |
| 7382 | u64 flags[BTRFS_MAX_LEVEL]; |
| 7383 | struct btrfs_key update_progress; |
| 7384 | int stage; |
| 7385 | int level; |
| 7386 | int shared_level; |
| 7387 | int update_ref; |
| 7388 | int keep_locks; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7389 | int reada_slot; |
| 7390 | int reada_count; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7391 | int for_reloc; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7392 | }; |
| 7393 | |
| 7394 | #define DROP_REFERENCE 1 |
| 7395 | #define UPDATE_BACKREF 2 |
| 7396 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7397 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
| 7398 | struct btrfs_root *root, |
| 7399 | struct walk_control *wc, |
| 7400 | struct btrfs_path *path) |
| 7401 | { |
| 7402 | u64 bytenr; |
| 7403 | u64 generation; |
| 7404 | u64 refs; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7405 | u64 flags; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7406 | u32 nritems; |
| 7407 | u32 blocksize; |
| 7408 | struct btrfs_key key; |
| 7409 | struct extent_buffer *eb; |
| 7410 | int ret; |
| 7411 | int slot; |
| 7412 | int nread = 0; |
| 7413 | |
| 7414 | if (path->slots[wc->level] < wc->reada_slot) { |
| 7415 | wc->reada_count = wc->reada_count * 2 / 3; |
| 7416 | wc->reada_count = max(wc->reada_count, 2); |
| 7417 | } else { |
| 7418 | wc->reada_count = wc->reada_count * 3 / 2; |
| 7419 | wc->reada_count = min_t(int, wc->reada_count, |
| 7420 | BTRFS_NODEPTRS_PER_BLOCK(root)); |
| 7421 | } |
| 7422 | |
| 7423 | eb = path->nodes[wc->level]; |
| 7424 | nritems = btrfs_header_nritems(eb); |
| 7425 | blocksize = btrfs_level_size(root, wc->level - 1); |
| 7426 | |
| 7427 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
| 7428 | if (nread >= wc->reada_count) |
| 7429 | break; |
| 7430 | |
| 7431 | cond_resched(); |
| 7432 | bytenr = btrfs_node_blockptr(eb, slot); |
| 7433 | generation = btrfs_node_ptr_generation(eb, slot); |
| 7434 | |
| 7435 | if (slot == path->slots[wc->level]) |
| 7436 | goto reada; |
| 7437 | |
| 7438 | if (wc->stage == UPDATE_BACKREF && |
| 7439 | generation <= root->root_key.offset) |
| 7440 | continue; |
| 7441 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7442 | /* 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] | 7443 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
| 7444 | wc->level - 1, 1, &refs, |
| 7445 | &flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7446 | /* We don't care about errors in readahead. */ |
| 7447 | if (ret < 0) |
| 7448 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7449 | BUG_ON(refs == 0); |
| 7450 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7451 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7452 | if (refs == 1) |
| 7453 | goto reada; |
| 7454 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7455 | if (wc->level == 1 && |
| 7456 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7457 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7458 | if (!wc->update_ref || |
| 7459 | generation <= root->root_key.offset) |
| 7460 | continue; |
| 7461 | btrfs_node_key_to_cpu(eb, &key, slot); |
| 7462 | ret = btrfs_comp_cpu_keys(&key, |
| 7463 | &wc->update_progress); |
| 7464 | if (ret < 0) |
| 7465 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7466 | } else { |
| 7467 | if (wc->level == 1 && |
| 7468 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7469 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7470 | } |
| 7471 | reada: |
| 7472 | ret = readahead_tree_block(root, bytenr, blocksize, |
| 7473 | generation); |
| 7474 | if (ret) |
| 7475 | break; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7476 | nread++; |
| 7477 | } |
| 7478 | wc->reada_slot = slot; |
| 7479 | } |
| 7480 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7481 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7482 | * helper to process tree block while walking down the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7483 | * |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7484 | * when wc->stage == UPDATE_BACKREF, this function updates |
| 7485 | * back refs for pointers in the block. |
| 7486 | * |
| 7487 | * NOTE: return value 1 means we should stop walking down. |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7488 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7489 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
| 7490 | struct btrfs_root *root, |
| 7491 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7492 | struct walk_control *wc, int lookup_info) |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7493 | { |
| 7494 | int level = wc->level; |
| 7495 | struct extent_buffer *eb = path->nodes[level]; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7496 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7497 | int ret; |
| 7498 | |
| 7499 | if (wc->stage == UPDATE_BACKREF && |
| 7500 | btrfs_header_owner(eb) != root->root_key.objectid) |
| 7501 | return 1; |
| 7502 | |
| 7503 | /* |
| 7504 | * when reference count of tree block is 1, it won't increase |
| 7505 | * again. once full backref flag is set, we never clear it. |
| 7506 | */ |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7507 | if (lookup_info && |
| 7508 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || |
| 7509 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7510 | BUG_ON(!path->locks[level]); |
| 7511 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7512 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7513 | &wc->refs[level], |
| 7514 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7515 | BUG_ON(ret == -ENOMEM); |
| 7516 | if (ret) |
| 7517 | return ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7518 | BUG_ON(wc->refs[level] == 0); |
| 7519 | } |
| 7520 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7521 | if (wc->stage == DROP_REFERENCE) { |
| 7522 | if (wc->refs[level] > 1) |
| 7523 | return 1; |
| 7524 | |
| 7525 | if (path->locks[level] && !wc->keep_locks) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7526 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7527 | path->locks[level] = 0; |
| 7528 | } |
| 7529 | return 0; |
| 7530 | } |
| 7531 | |
| 7532 | /* wc->stage == UPDATE_BACKREF */ |
| 7533 | if (!(wc->flags[level] & flag)) { |
| 7534 | BUG_ON(!path->locks[level]); |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7535 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7536 | BUG_ON(ret); /* -ENOMEM */ |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7537 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7538 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7539 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 7540 | eb->len, flag, |
| 7541 | btrfs_header_level(eb), 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7542 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7543 | wc->flags[level] |= flag; |
| 7544 | } |
| 7545 | |
| 7546 | /* |
| 7547 | * the block is shared by multiple trees, so it's not good to |
| 7548 | * keep the tree lock |
| 7549 | */ |
| 7550 | if (path->locks[level] && level > 0) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7551 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7552 | path->locks[level] = 0; |
| 7553 | } |
| 7554 | return 0; |
| 7555 | } |
| 7556 | |
| 7557 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7558 | * helper to process tree block pointer. |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7559 | * |
| 7560 | * when wc->stage == DROP_REFERENCE, this function checks |
| 7561 | * reference count of the block pointed to. if the block |
| 7562 | * is shared and we need update back refs for the subtree |
| 7563 | * rooted at the block, this function changes wc->stage to |
| 7564 | * UPDATE_BACKREF. if the block is shared and there is no |
| 7565 | * need to update back, this function drops the reference |
| 7566 | * to the block. |
| 7567 | * |
| 7568 | * NOTE: return value 1 means we should stop walking down. |
| 7569 | */ |
| 7570 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, |
| 7571 | struct btrfs_root *root, |
| 7572 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7573 | struct walk_control *wc, int *lookup_info) |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7574 | { |
| 7575 | u64 bytenr; |
| 7576 | u64 generation; |
| 7577 | u64 parent; |
| 7578 | u32 blocksize; |
| 7579 | struct btrfs_key key; |
| 7580 | struct extent_buffer *next; |
| 7581 | int level = wc->level; |
| 7582 | int reada = 0; |
| 7583 | int ret = 0; |
| 7584 | |
| 7585 | generation = btrfs_node_ptr_generation(path->nodes[level], |
| 7586 | path->slots[level]); |
| 7587 | /* |
| 7588 | * if the lower level block was created before the snapshot |
| 7589 | * was created, we know there is no need to update back refs |
| 7590 | * for the subtree |
| 7591 | */ |
| 7592 | if (wc->stage == UPDATE_BACKREF && |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7593 | generation <= root->root_key.offset) { |
| 7594 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7595 | return 1; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7596 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7597 | |
| 7598 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); |
| 7599 | blocksize = btrfs_level_size(root, level - 1); |
| 7600 | |
| 7601 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
| 7602 | if (!next) { |
| 7603 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 7604 | if (!next) |
| 7605 | return -ENOMEM; |
Josef Bacik | b2aaaa3 | 2013-07-05 17:05:38 -0400 | [diff] [blame] | 7606 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
| 7607 | level - 1); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7608 | reada = 1; |
| 7609 | } |
| 7610 | btrfs_tree_lock(next); |
| 7611 | btrfs_set_lock_blocking(next); |
| 7612 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7613 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7614 | &wc->refs[level - 1], |
| 7615 | &wc->flags[level - 1]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7616 | if (ret < 0) { |
| 7617 | btrfs_tree_unlock(next); |
| 7618 | return ret; |
| 7619 | } |
| 7620 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7621 | if (unlikely(wc->refs[level - 1] == 0)) { |
| 7622 | btrfs_err(root->fs_info, "Missing references."); |
| 7623 | BUG(); |
| 7624 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7625 | *lookup_info = 0; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7626 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7627 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7628 | if (wc->refs[level - 1] > 1) { |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7629 | if (level == 1 && |
| 7630 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7631 | goto skip; |
| 7632 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7633 | if (!wc->update_ref || |
| 7634 | generation <= root->root_key.offset) |
| 7635 | goto skip; |
| 7636 | |
| 7637 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
| 7638 | path->slots[level]); |
| 7639 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); |
| 7640 | if (ret < 0) |
| 7641 | goto skip; |
| 7642 | |
| 7643 | wc->stage = UPDATE_BACKREF; |
| 7644 | wc->shared_level = level - 1; |
| 7645 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7646 | } else { |
| 7647 | if (level == 1 && |
| 7648 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7649 | goto skip; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7650 | } |
| 7651 | |
Chris Mason | b9fab91 | 2012-05-06 07:23:47 -0400 | [diff] [blame] | 7652 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7653 | btrfs_tree_unlock(next); |
| 7654 | free_extent_buffer(next); |
| 7655 | next = NULL; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7656 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7657 | } |
| 7658 | |
| 7659 | if (!next) { |
| 7660 | if (reada && level == 1) |
| 7661 | reada_walk_down(trans, root, wc, path); |
| 7662 | next = read_tree_block(root, bytenr, blocksize, generation); |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 7663 | if (!next || !extent_buffer_uptodate(next)) { |
| 7664 | free_extent_buffer(next); |
Tsutomu Itoh | 97d9a8a | 2011-03-24 06:33:21 +0000 | [diff] [blame] | 7665 | return -EIO; |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 7666 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7667 | btrfs_tree_lock(next); |
| 7668 | btrfs_set_lock_blocking(next); |
| 7669 | } |
| 7670 | |
| 7671 | level--; |
| 7672 | BUG_ON(level != btrfs_header_level(next)); |
| 7673 | path->nodes[level] = next; |
| 7674 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7675 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7676 | wc->level = level; |
| 7677 | if (wc->level == 1) |
| 7678 | wc->reada_slot = 0; |
| 7679 | return 0; |
| 7680 | skip: |
| 7681 | wc->refs[level - 1] = 0; |
| 7682 | wc->flags[level - 1] = 0; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7683 | if (wc->stage == DROP_REFERENCE) { |
| 7684 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| 7685 | parent = path->nodes[level]->start; |
| 7686 | } else { |
| 7687 | BUG_ON(root->root_key.objectid != |
| 7688 | btrfs_header_owner(path->nodes[level])); |
| 7689 | parent = 0; |
| 7690 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7691 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7692 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7693 | root->root_key.objectid, level - 1, 0, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7694 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7695 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7696 | btrfs_tree_unlock(next); |
| 7697 | free_extent_buffer(next); |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7698 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7699 | return 1; |
| 7700 | } |
| 7701 | |
| 7702 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7703 | * helper to process tree block while walking up the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7704 | * |
| 7705 | * when wc->stage == DROP_REFERENCE, this function drops |
| 7706 | * reference count on the block. |
| 7707 | * |
| 7708 | * when wc->stage == UPDATE_BACKREF, this function changes |
| 7709 | * wc->stage back to DROP_REFERENCE if we changed wc->stage |
| 7710 | * to UPDATE_BACKREF previously while processing the block. |
| 7711 | * |
| 7712 | * NOTE: return value 1 means we should stop walking up. |
| 7713 | */ |
| 7714 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, |
| 7715 | struct btrfs_root *root, |
| 7716 | struct btrfs_path *path, |
| 7717 | struct walk_control *wc) |
| 7718 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7719 | int ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7720 | int level = wc->level; |
| 7721 | struct extent_buffer *eb = path->nodes[level]; |
| 7722 | u64 parent = 0; |
| 7723 | |
| 7724 | if (wc->stage == UPDATE_BACKREF) { |
| 7725 | BUG_ON(wc->shared_level < level); |
| 7726 | if (level < wc->shared_level) |
| 7727 | goto out; |
| 7728 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7729 | ret = find_next_key(path, level + 1, &wc->update_progress); |
| 7730 | if (ret > 0) |
| 7731 | wc->update_ref = 0; |
| 7732 | |
| 7733 | wc->stage = DROP_REFERENCE; |
| 7734 | wc->shared_level = -1; |
| 7735 | path->slots[level] = 0; |
| 7736 | |
| 7737 | /* |
| 7738 | * check reference count again if the block isn't locked. |
| 7739 | * we should start walking down the tree again if reference |
| 7740 | * count is one. |
| 7741 | */ |
| 7742 | if (!path->locks[level]) { |
| 7743 | BUG_ON(level == 0); |
| 7744 | btrfs_tree_lock(eb); |
| 7745 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7746 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7747 | |
| 7748 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7749 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7750 | &wc->refs[level], |
| 7751 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7752 | if (ret < 0) { |
| 7753 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 7754 | path->locks[level] = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7755 | return ret; |
| 7756 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7757 | BUG_ON(wc->refs[level] == 0); |
| 7758 | if (wc->refs[level] == 1) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7759 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 7760 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7761 | return 1; |
| 7762 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7763 | } |
| 7764 | } |
| 7765 | |
| 7766 | /* wc->stage == DROP_REFERENCE */ |
| 7767 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); |
| 7768 | |
| 7769 | if (wc->refs[level] == 1) { |
| 7770 | if (level == 0) { |
| 7771 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7772 | ret = btrfs_dec_ref(trans, root, eb, 1, |
| 7773 | wc->for_reloc); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7774 | else |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7775 | ret = btrfs_dec_ref(trans, root, eb, 0, |
| 7776 | wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7777 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7778 | } |
| 7779 | /* make block locked assertion in clean_tree_block happy */ |
| 7780 | if (!path->locks[level] && |
| 7781 | btrfs_header_generation(eb) == trans->transid) { |
| 7782 | btrfs_tree_lock(eb); |
| 7783 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7784 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7785 | } |
| 7786 | clean_tree_block(trans, root, eb); |
| 7787 | } |
| 7788 | |
| 7789 | if (eb == root->node) { |
| 7790 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 7791 | parent = eb->start; |
| 7792 | else |
| 7793 | BUG_ON(root->root_key.objectid != |
| 7794 | btrfs_header_owner(eb)); |
| 7795 | } else { |
| 7796 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 7797 | parent = path->nodes[level + 1]->start; |
| 7798 | else |
| 7799 | BUG_ON(root->root_key.objectid != |
| 7800 | btrfs_header_owner(path->nodes[level + 1])); |
| 7801 | } |
| 7802 | |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7803 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7804 | out: |
| 7805 | wc->refs[level] = 0; |
| 7806 | wc->flags[level] = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7807 | return 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7808 | } |
| 7809 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7810 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
| 7811 | struct btrfs_root *root, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7812 | struct btrfs_path *path, |
| 7813 | struct walk_control *wc) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7814 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7815 | int level = wc->level; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7816 | int lookup_info = 1; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7817 | int ret; |
| 7818 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7819 | while (level >= 0) { |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7820 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7821 | if (ret > 0) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7822 | break; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7823 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7824 | if (level == 0) |
| 7825 | break; |
| 7826 | |
Yan, Zheng | 7a7965f | 2010-02-01 02:41:17 +0000 | [diff] [blame] | 7827 | if (path->slots[level] >= |
| 7828 | btrfs_header_nritems(path->nodes[level])) |
| 7829 | break; |
| 7830 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7831 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7832 | if (ret > 0) { |
| 7833 | path->slots[level]++; |
| 7834 | continue; |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 7835 | } else if (ret < 0) |
| 7836 | return ret; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7837 | level = wc->level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7838 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7839 | return 0; |
| 7840 | } |
| 7841 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7842 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 7843 | struct btrfs_root *root, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7844 | struct btrfs_path *path, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7845 | struct walk_control *wc, int max_level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7846 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7847 | int level = wc->level; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7848 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7849 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7850 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
| 7851 | while (level < max_level && path->nodes[level]) { |
| 7852 | wc->level = level; |
| 7853 | if (path->slots[level] + 1 < |
| 7854 | btrfs_header_nritems(path->nodes[level])) { |
| 7855 | path->slots[level]++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7856 | return 0; |
| 7857 | } else { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7858 | ret = walk_up_proc(trans, root, path, wc); |
| 7859 | if (ret > 0) |
| 7860 | return 0; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 7861 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7862 | if (path->locks[level]) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7863 | btrfs_tree_unlock_rw(path->nodes[level], |
| 7864 | path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7865 | path->locks[level] = 0; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7866 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7867 | free_extent_buffer(path->nodes[level]); |
| 7868 | path->nodes[level] = NULL; |
| 7869 | level++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7870 | } |
| 7871 | } |
| 7872 | return 1; |
| 7873 | } |
| 7874 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7875 | /* |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7876 | * drop a subvolume tree. |
| 7877 | * |
| 7878 | * this function traverses the tree freeing any blocks that only |
| 7879 | * referenced by the tree. |
| 7880 | * |
| 7881 | * when a shared tree block is found. this function decreases its |
| 7882 | * reference count by one. if update_ref is true, this function |
| 7883 | * also make sure backrefs for the shared block and all lower level |
| 7884 | * blocks are properly updated. |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 7885 | * |
| 7886 | * If called with for_reloc == 0, may exit early with -EAGAIN |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7887 | */ |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 7888 | int btrfs_drop_snapshot(struct btrfs_root *root, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7889 | struct btrfs_block_rsv *block_rsv, int update_ref, |
| 7890 | int for_reloc) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7891 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 7892 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7893 | struct btrfs_trans_handle *trans; |
| 7894 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7895 | struct btrfs_root_item *root_item = &root->root_item; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7896 | struct walk_control *wc; |
| 7897 | struct btrfs_key key; |
| 7898 | int err = 0; |
| 7899 | int ret; |
| 7900 | int level; |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 7901 | bool root_dropped = false; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7902 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 7903 | path = btrfs_alloc_path(); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7904 | if (!path) { |
| 7905 | err = -ENOMEM; |
| 7906 | goto out; |
| 7907 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7908 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7909 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 7910 | if (!wc) { |
| 7911 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7912 | err = -ENOMEM; |
| 7913 | goto out; |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 7914 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7915 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7916 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7917 | if (IS_ERR(trans)) { |
| 7918 | err = PTR_ERR(trans); |
| 7919 | goto out_free; |
| 7920 | } |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 7921 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7922 | if (block_rsv) |
| 7923 | trans->block_rsv = block_rsv; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7924 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7925 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7926 | level = btrfs_header_level(root->node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7927 | path->nodes[level] = btrfs_lock_root_node(root); |
| 7928 | btrfs_set_lock_blocking(path->nodes[level]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7929 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7930 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7931 | memset(&wc->update_progress, 0, |
| 7932 | sizeof(wc->update_progress)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7933 | } else { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7934 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7935 | memcpy(&wc->update_progress, &key, |
| 7936 | sizeof(wc->update_progress)); |
| 7937 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 7938 | level = root_item->drop_level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7939 | BUG_ON(level == 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 7940 | path->lowest_level = level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7941 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 7942 | path->lowest_level = 0; |
| 7943 | if (ret < 0) { |
| 7944 | err = ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7945 | goto out_end_trans; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7946 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7947 | WARN_ON(ret > 0); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7948 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 7949 | /* |
| 7950 | * unlock our path, this is safe because only this |
| 7951 | * function is allowed to delete this snapshot |
| 7952 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7953 | btrfs_unlock_up_safe(path, 0); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7954 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7955 | level = btrfs_header_level(root->node); |
| 7956 | while (1) { |
| 7957 | btrfs_tree_lock(path->nodes[level]); |
| 7958 | btrfs_set_lock_blocking(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 7959 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7960 | |
| 7961 | ret = btrfs_lookup_extent_info(trans, root, |
| 7962 | path->nodes[level]->start, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7963 | level, 1, &wc->refs[level], |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7964 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7965 | if (ret < 0) { |
| 7966 | err = ret; |
| 7967 | goto out_end_trans; |
| 7968 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7969 | BUG_ON(wc->refs[level] == 0); |
| 7970 | |
| 7971 | if (level == root_item->drop_level) |
| 7972 | break; |
| 7973 | |
| 7974 | btrfs_tree_unlock(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 7975 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7976 | WARN_ON(wc->refs[level] != 1); |
| 7977 | level--; |
| 7978 | } |
| 7979 | } |
| 7980 | |
| 7981 | wc->level = level; |
| 7982 | wc->shared_level = -1; |
| 7983 | wc->stage = DROP_REFERENCE; |
| 7984 | wc->update_ref = update_ref; |
| 7985 | wc->keep_locks = 0; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7986 | wc->for_reloc = for_reloc; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7987 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7988 | |
| 7989 | while (1) { |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 7990 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7991 | ret = walk_down_tree(trans, root, path, wc); |
| 7992 | if (ret < 0) { |
| 7993 | err = ret; |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 7994 | break; |
| 7995 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7996 | |
| 7997 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
| 7998 | if (ret < 0) { |
| 7999 | err = ret; |
| 8000 | break; |
| 8001 | } |
| 8002 | |
| 8003 | if (ret > 0) { |
| 8004 | BUG_ON(wc->stage != DROP_REFERENCE); |
| 8005 | break; |
| 8006 | } |
| 8007 | |
| 8008 | if (wc->stage == DROP_REFERENCE) { |
| 8009 | level = wc->level; |
| 8010 | btrfs_node_key(path->nodes[level], |
| 8011 | &root_item->drop_progress, |
| 8012 | path->slots[level]); |
| 8013 | root_item->drop_level = level; |
| 8014 | } |
| 8015 | |
| 8016 | BUG_ON(wc->level == 0); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8017 | if (btrfs_should_end_transaction(trans, tree_root) || |
| 8018 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8019 | ret = btrfs_update_root(trans, tree_root, |
| 8020 | &root->root_key, |
| 8021 | root_item); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8022 | if (ret) { |
| 8023 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8024 | err = ret; |
| 8025 | goto out_end_trans; |
| 8026 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8027 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8028 | btrfs_end_transaction_throttle(trans, tree_root); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8029 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 8030 | pr_debug("BTRFS: drop snapshot early exit\n"); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 8031 | err = -EAGAIN; |
| 8032 | goto out_free; |
| 8033 | } |
| 8034 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 8035 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8036 | if (IS_ERR(trans)) { |
| 8037 | err = PTR_ERR(trans); |
| 8038 | goto out_free; |
| 8039 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8040 | if (block_rsv) |
| 8041 | trans->block_rsv = block_rsv; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 8042 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8043 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8044 | btrfs_release_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8045 | if (err) |
| 8046 | goto out_end_trans; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8047 | |
| 8048 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8049 | if (ret) { |
| 8050 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8051 | goto out_end_trans; |
| 8052 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8053 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8054 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 8055 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
| 8056 | NULL, NULL); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8057 | if (ret < 0) { |
| 8058 | btrfs_abort_transaction(trans, tree_root, ret); |
| 8059 | err = ret; |
| 8060 | goto out_end_trans; |
| 8061 | } else if (ret > 0) { |
Josef Bacik | 84cd948 | 2010-12-08 12:24:01 -0500 | [diff] [blame] | 8062 | /* if we fail to delete the orphan item this time |
| 8063 | * around, it'll get picked up the next time. |
| 8064 | * |
| 8065 | * The most common failure here is just -ENOENT. |
| 8066 | */ |
| 8067 | btrfs_del_orphan_item(trans, tree_root, |
| 8068 | root->root_key.objectid); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8069 | } |
| 8070 | } |
| 8071 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 8072 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 8073 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8074 | } else { |
| 8075 | free_extent_buffer(root->node); |
| 8076 | free_extent_buffer(root->commit_root); |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 8077 | btrfs_put_fs_root(root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 8078 | } |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8079 | root_dropped = true; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8080 | out_end_trans: |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 8081 | btrfs_end_transaction_throttle(trans, tree_root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8082 | out_free: |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8083 | kfree(wc); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 8084 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8085 | out: |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8086 | /* |
| 8087 | * So if we need to stop dropping the snapshot for whatever reason we |
| 8088 | * need to make sure to add it back to the dead root list so that we |
| 8089 | * keep trying to do the work later. This also cleans up roots if we |
| 8090 | * don't have it in the radix (like when we recover after a power fail |
| 8091 | * or unmount) so we don't leak memory. |
| 8092 | */ |
Josef Bacik | b37b39c | 2013-07-23 16:57:15 -0400 | [diff] [blame] | 8093 | if (!for_reloc && root_dropped == false) |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 8094 | btrfs_add_dead_root(root); |
Wang Shilong | 90515e7 | 2014-01-07 17:26:58 +0800 | [diff] [blame] | 8095 | if (err && err != -EAGAIN) |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 8096 | btrfs_std_error(root->fs_info, err); |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 8097 | return err; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 8098 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8099 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8100 | /* |
| 8101 | * drop subtree rooted at tree block 'node'. |
| 8102 | * |
| 8103 | * NOTE: this function will unlock and release tree block 'node' |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8104 | * only used by relocation code |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8105 | */ |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8106 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| 8107 | struct btrfs_root *root, |
| 8108 | struct extent_buffer *node, |
| 8109 | struct extent_buffer *parent) |
| 8110 | { |
| 8111 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8112 | struct walk_control *wc; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8113 | int level; |
| 8114 | int parent_level; |
| 8115 | int ret = 0; |
| 8116 | int wret; |
| 8117 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8118 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 8119 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8120 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 8121 | if (!path) |
| 8122 | return -ENOMEM; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8123 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8124 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 8125 | if (!wc) { |
| 8126 | btrfs_free_path(path); |
| 8127 | return -ENOMEM; |
| 8128 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8129 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 8130 | btrfs_assert_tree_locked(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8131 | parent_level = btrfs_header_level(parent); |
| 8132 | extent_buffer_get(parent); |
| 8133 | path->nodes[parent_level] = parent; |
| 8134 | path->slots[parent_level] = btrfs_header_nritems(parent); |
| 8135 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 8136 | btrfs_assert_tree_locked(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8137 | level = btrfs_header_level(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8138 | path->nodes[level] = node; |
| 8139 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 8140 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8141 | |
| 8142 | wc->refs[parent_level] = 1; |
| 8143 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 8144 | wc->level = level; |
| 8145 | wc->shared_level = -1; |
| 8146 | wc->stage = DROP_REFERENCE; |
| 8147 | wc->update_ref = 0; |
| 8148 | wc->keep_locks = 1; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 8149 | wc->for_reloc = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 8150 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8151 | |
| 8152 | while (1) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8153 | wret = walk_down_tree(trans, root, path, wc); |
| 8154 | if (wret < 0) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8155 | ret = wret; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8156 | break; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8157 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8158 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8159 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8160 | if (wret < 0) |
| 8161 | ret = wret; |
| 8162 | if (wret != 0) |
| 8163 | break; |
| 8164 | } |
| 8165 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 8166 | kfree(wc); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8167 | btrfs_free_path(path); |
| 8168 | return ret; |
| 8169 | } |
| 8170 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8171 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 8172 | { |
| 8173 | u64 num_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8174 | u64 stripped; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8175 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8176 | /* |
| 8177 | * if restripe for this chunk_type is on pick target profile and |
| 8178 | * return, otherwise do the usual balance |
| 8179 | */ |
| 8180 | stripped = get_restripe_target(root->fs_info, flags); |
| 8181 | if (stripped) |
| 8182 | return extended_to_chunk(stripped); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 8183 | |
Chris Mason | cd02dca | 2010-12-13 14:56:23 -0500 | [diff] [blame] | 8184 | /* |
| 8185 | * we add in the count of missing devices because we want |
| 8186 | * to make sure that any RAID levels on a degraded FS |
| 8187 | * continue to be honored. |
| 8188 | */ |
| 8189 | num_devices = root->fs_info->fs_devices->rw_devices + |
| 8190 | root->fs_info->fs_devices->missing_devices; |
| 8191 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8192 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8193 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8194 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 8195 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8196 | if (num_devices == 1) { |
| 8197 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 8198 | stripped = flags & ~stripped; |
| 8199 | |
| 8200 | /* turn raid0 into single device chunks */ |
| 8201 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 8202 | return stripped; |
| 8203 | |
| 8204 | /* turn mirroring into duplication */ |
| 8205 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 8206 | BTRFS_BLOCK_GROUP_RAID10)) |
| 8207 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8208 | } else { |
| 8209 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8210 | if (flags & stripped) |
| 8211 | return flags; |
| 8212 | |
| 8213 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 8214 | stripped = flags & ~stripped; |
| 8215 | |
| 8216 | /* switch duplicated blocks with raid1 */ |
| 8217 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 8218 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 8219 | |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 8220 | /* this is drive concat, leave it alone */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8221 | } |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 8222 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 8223 | return flags; |
| 8224 | } |
| 8225 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8226 | 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] | 8227 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8228 | struct btrfs_space_info *sinfo = cache->space_info; |
| 8229 | u64 num_bytes; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8230 | u64 min_allocable_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8231 | int ret = -ENOSPC; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8232 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 8233 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8234 | /* |
| 8235 | * We need some metadata space and system metadata space for |
| 8236 | * allocating chunks in some corner cases until we force to set |
| 8237 | * it to be readonly. |
| 8238 | */ |
| 8239 | if ((sinfo->flags & |
| 8240 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && |
| 8241 | !force) |
| 8242 | min_allocable_bytes = 1 * 1024 * 1024; |
| 8243 | else |
| 8244 | min_allocable_bytes = 0; |
| 8245 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8246 | spin_lock(&sinfo->lock); |
| 8247 | spin_lock(&cache->lock); |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 8248 | |
| 8249 | if (cache->ro) { |
| 8250 | ret = 0; |
| 8251 | goto out; |
| 8252 | } |
| 8253 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8254 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 8255 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 8256 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8257 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 8258 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
| 8259 | min_allocable_bytes <= sinfo->total_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8260 | sinfo->bytes_readonly += num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8261 | cache->ro = 1; |
| 8262 | ret = 0; |
| 8263 | } |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 8264 | out: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8265 | spin_unlock(&cache->lock); |
| 8266 | spin_unlock(&sinfo->lock); |
| 8267 | return ret; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8268 | } |
| 8269 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8270 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
| 8271 | struct btrfs_block_group_cache *cache) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8272 | |
| 8273 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8274 | struct btrfs_trans_handle *trans; |
| 8275 | u64 alloc_flags; |
| 8276 | int ret; |
| 8277 | |
| 8278 | BUG_ON(cache->ro); |
| 8279 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 8280 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8281 | if (IS_ERR(trans)) |
| 8282 | return PTR_ERR(trans); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8283 | |
| 8284 | alloc_flags = update_block_group_flags(root, cache->flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8285 | if (alloc_flags != cache->flags) { |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 8286 | ret = do_chunk_alloc(trans, root, alloc_flags, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8287 | CHUNK_ALLOC_FORCE); |
| 8288 | if (ret < 0) |
| 8289 | goto out; |
| 8290 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8291 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8292 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8293 | if (!ret) |
| 8294 | goto out; |
| 8295 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 8296 | ret = do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 8297 | CHUNK_ALLOC_FORCE); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8298 | if (ret < 0) |
| 8299 | goto out; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8300 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8301 | out: |
| 8302 | btrfs_end_transaction(trans, root); |
| 8303 | return ret; |
| 8304 | } |
| 8305 | |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 8306 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
| 8307 | struct btrfs_root *root, u64 type) |
| 8308 | { |
| 8309 | u64 alloc_flags = get_alloc_profile(root, type); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 8310 | return do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 8311 | CHUNK_ALLOC_FORCE); |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 8312 | } |
| 8313 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8314 | /* |
| 8315 | * helper to account the unused space of all the readonly block group in the |
| 8316 | * list. takes mirrors into account. |
| 8317 | */ |
| 8318 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) |
| 8319 | { |
| 8320 | struct btrfs_block_group_cache *block_group; |
| 8321 | u64 free_bytes = 0; |
| 8322 | int factor; |
| 8323 | |
| 8324 | list_for_each_entry(block_group, groups_list, list) { |
| 8325 | spin_lock(&block_group->lock); |
| 8326 | |
| 8327 | if (!block_group->ro) { |
| 8328 | spin_unlock(&block_group->lock); |
| 8329 | continue; |
| 8330 | } |
| 8331 | |
| 8332 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 8333 | BTRFS_BLOCK_GROUP_RAID10 | |
| 8334 | BTRFS_BLOCK_GROUP_DUP)) |
| 8335 | factor = 2; |
| 8336 | else |
| 8337 | factor = 1; |
| 8338 | |
| 8339 | free_bytes += (block_group->key.offset - |
| 8340 | btrfs_block_group_used(&block_group->item)) * |
| 8341 | factor; |
| 8342 | |
| 8343 | spin_unlock(&block_group->lock); |
| 8344 | } |
| 8345 | |
| 8346 | return free_bytes; |
| 8347 | } |
| 8348 | |
| 8349 | /* |
| 8350 | * helper to account the unused space of all the readonly block group in the |
| 8351 | * space_info. takes mirrors into account. |
| 8352 | */ |
| 8353 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
| 8354 | { |
| 8355 | int i; |
| 8356 | u64 free_bytes = 0; |
| 8357 | |
| 8358 | spin_lock(&sinfo->lock); |
| 8359 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 8360 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 8361 | if (!list_empty(&sinfo->block_groups[i])) |
| 8362 | free_bytes += __btrfs_get_ro_block_group_free_space( |
| 8363 | &sinfo->block_groups[i]); |
| 8364 | |
| 8365 | spin_unlock(&sinfo->lock); |
| 8366 | |
| 8367 | return free_bytes; |
| 8368 | } |
| 8369 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 8370 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8371 | struct btrfs_block_group_cache *cache) |
| 8372 | { |
| 8373 | struct btrfs_space_info *sinfo = cache->space_info; |
| 8374 | u64 num_bytes; |
| 8375 | |
| 8376 | BUG_ON(!cache->ro); |
| 8377 | |
| 8378 | spin_lock(&sinfo->lock); |
| 8379 | spin_lock(&cache->lock); |
| 8380 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 8381 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
| 8382 | sinfo->bytes_readonly -= num_bytes; |
| 8383 | cache->ro = 0; |
| 8384 | spin_unlock(&cache->lock); |
| 8385 | spin_unlock(&sinfo->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8386 | } |
| 8387 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8388 | /* |
| 8389 | * checks to see if its even possible to relocate this block group. |
| 8390 | * |
| 8391 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its |
| 8392 | * ok to go ahead and try. |
| 8393 | */ |
| 8394 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8395 | { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8396 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8397 | struct btrfs_space_info *space_info; |
| 8398 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 8399 | struct btrfs_device *device; |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8400 | struct btrfs_trans_handle *trans; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8401 | u64 min_free; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8402 | u64 dev_min = 1; |
| 8403 | u64 dev_nr = 0; |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8404 | u64 target; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8405 | int index; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8406 | int full = 0; |
| 8407 | int ret = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8408 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8409 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8410 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8411 | /* odd, couldn't find the block group, leave it alone */ |
| 8412 | if (!block_group) |
| 8413 | return -1; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8414 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8415 | min_free = btrfs_block_group_used(&block_group->item); |
| 8416 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8417 | /* no bytes used, we're good */ |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8418 | if (!min_free) |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8419 | goto out; |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8420 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8421 | space_info = block_group->space_info; |
| 8422 | spin_lock(&space_info->lock); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8423 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8424 | full = space_info->full; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8425 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8426 | /* |
| 8427 | * 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] | 8428 | * relocate it unless we're able to allocate a new chunk below. |
| 8429 | * |
| 8430 | * Otherwise, we need to make sure we have room in the space to handle |
| 8431 | * 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] | 8432 | */ |
Chris Mason | 7ce618d | 2009-09-22 14:48:44 -0400 | [diff] [blame] | 8433 | if ((space_info->total_bytes != block_group->key.offset) && |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8434 | (space_info->bytes_used + space_info->bytes_reserved + |
| 8435 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 8436 | min_free < space_info->total_bytes)) { |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8437 | spin_unlock(&space_info->lock); |
| 8438 | goto out; |
| 8439 | } |
| 8440 | spin_unlock(&space_info->lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8441 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8442 | /* |
| 8443 | * ok we don't have enough space, but maybe we have free space on our |
| 8444 | * devices to allocate new chunks for relocation, so loop through our |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8445 | * alloc devices and guess if we have enough space. if this block |
| 8446 | * group is going to be restriped, run checks against the target |
| 8447 | * profile instead of the current one. |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8448 | */ |
| 8449 | ret = -1; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 8450 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8451 | /* |
| 8452 | * index: |
| 8453 | * 0: raid10 |
| 8454 | * 1: raid1 |
| 8455 | * 2: dup |
| 8456 | * 3: raid0 |
| 8457 | * 4: single |
| 8458 | */ |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8459 | target = get_restripe_target(root->fs_info, block_group->flags); |
| 8460 | if (target) { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 8461 | index = __get_raid_index(extended_to_chunk(target)); |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8462 | } else { |
| 8463 | /* |
| 8464 | * this is just a balance, so if we were marked as full |
| 8465 | * we know there is no space for a new chunk |
| 8466 | */ |
| 8467 | if (full) |
| 8468 | goto out; |
| 8469 | |
| 8470 | index = get_block_group_index(block_group); |
| 8471 | } |
| 8472 | |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8473 | if (index == BTRFS_RAID_RAID10) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8474 | dev_min = 4; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8475 | /* Divide by 2 */ |
| 8476 | min_free >>= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8477 | } else if (index == BTRFS_RAID_RAID1) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8478 | dev_min = 2; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8479 | } else if (index == BTRFS_RAID_DUP) { |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8480 | /* Multiply by 2 */ |
| 8481 | min_free <<= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8482 | } else if (index == BTRFS_RAID_RAID0) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8483 | dev_min = fs_devices->rw_devices; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8484 | do_div(min_free, dev_min); |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8485 | } |
| 8486 | |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8487 | /* We need to do this so that we can look at pending chunks */ |
| 8488 | trans = btrfs_join_transaction(root); |
| 8489 | if (IS_ERR(trans)) { |
| 8490 | ret = PTR_ERR(trans); |
| 8491 | goto out; |
| 8492 | } |
| 8493 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8494 | mutex_lock(&root->fs_info->chunk_mutex); |
| 8495 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8496 | u64 dev_offset; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 8497 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8498 | /* |
| 8499 | * check to make sure we can actually find a chunk with enough |
| 8500 | * space to fit our block group in. |
| 8501 | */ |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 8502 | if (device->total_bytes > device->bytes_used + min_free && |
| 8503 | !device->is_tgtdev_for_dev_replace) { |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8504 | ret = find_free_dev_extent(trans, device, min_free, |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8505 | &dev_offset, NULL); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8506 | if (!ret) |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8507 | dev_nr++; |
| 8508 | |
| 8509 | if (dev_nr >= dev_min) |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8510 | break; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8511 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8512 | ret = -1; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8513 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8514 | } |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8515 | mutex_unlock(&root->fs_info->chunk_mutex); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8516 | btrfs_end_transaction(trans, root); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8517 | out: |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8518 | btrfs_put_block_group(block_group); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8519 | return ret; |
| 8520 | } |
| 8521 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 8522 | static int find_first_block_group(struct btrfs_root *root, |
| 8523 | struct btrfs_path *path, struct btrfs_key *key) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8524 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8525 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8526 | struct btrfs_key found_key; |
| 8527 | struct extent_buffer *leaf; |
| 8528 | int slot; |
| 8529 | |
| 8530 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 8531 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8532 | goto out; |
| 8533 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 8534 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8535 | slot = path->slots[0]; |
| 8536 | leaf = path->nodes[0]; |
| 8537 | if (slot >= btrfs_header_nritems(leaf)) { |
| 8538 | ret = btrfs_next_leaf(root, path); |
| 8539 | if (ret == 0) |
| 8540 | continue; |
| 8541 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8542 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8543 | break; |
| 8544 | } |
| 8545 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 8546 | |
| 8547 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8548 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 8549 | ret = 0; |
| 8550 | goto out; |
| 8551 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8552 | path->slots[0]++; |
| 8553 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8554 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8555 | return ret; |
| 8556 | } |
| 8557 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8558 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
| 8559 | { |
| 8560 | struct btrfs_block_group_cache *block_group; |
| 8561 | u64 last = 0; |
| 8562 | |
| 8563 | while (1) { |
| 8564 | struct inode *inode; |
| 8565 | |
| 8566 | block_group = btrfs_lookup_first_block_group(info, last); |
| 8567 | while (block_group) { |
| 8568 | spin_lock(&block_group->lock); |
| 8569 | if (block_group->iref) |
| 8570 | break; |
| 8571 | spin_unlock(&block_group->lock); |
| 8572 | block_group = next_block_group(info->tree_root, |
| 8573 | block_group); |
| 8574 | } |
| 8575 | if (!block_group) { |
| 8576 | if (last == 0) |
| 8577 | break; |
| 8578 | last = 0; |
| 8579 | continue; |
| 8580 | } |
| 8581 | |
| 8582 | inode = block_group->inode; |
| 8583 | block_group->iref = 0; |
| 8584 | block_group->inode = NULL; |
| 8585 | spin_unlock(&block_group->lock); |
| 8586 | iput(inode); |
| 8587 | last = block_group->key.objectid + block_group->key.offset; |
| 8588 | btrfs_put_block_group(block_group); |
| 8589 | } |
| 8590 | } |
| 8591 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8592 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 8593 | { |
| 8594 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8595 | struct btrfs_space_info *space_info; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8596 | struct btrfs_caching_control *caching_ctl; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8597 | struct rb_node *n; |
| 8598 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 8599 | down_write(&info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8600 | while (!list_empty(&info->caching_block_groups)) { |
| 8601 | caching_ctl = list_entry(info->caching_block_groups.next, |
| 8602 | struct btrfs_caching_control, list); |
| 8603 | list_del(&caching_ctl->list); |
| 8604 | put_caching_control(caching_ctl); |
| 8605 | } |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 8606 | up_write(&info->commit_root_sem); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8607 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8608 | spin_lock(&info->block_group_cache_lock); |
| 8609 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { |
| 8610 | block_group = rb_entry(n, struct btrfs_block_group_cache, |
| 8611 | cache_node); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8612 | rb_erase(&block_group->cache_node, |
| 8613 | &info->block_group_cache_tree); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 8614 | spin_unlock(&info->block_group_cache_lock); |
| 8615 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8616 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8617 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8618 | up_write(&block_group->space_info->groups_sem); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 8619 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8620 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8621 | wait_block_group_cache_done(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8622 | |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8623 | /* |
| 8624 | * We haven't cached this block group, which means we could |
| 8625 | * possibly have excluded extents on this block group. |
| 8626 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 8627 | if (block_group->cached == BTRFS_CACHE_NO || |
| 8628 | block_group->cached == BTRFS_CACHE_ERROR) |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8629 | free_excluded_extents(info->extent_root, block_group); |
| 8630 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8631 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 8632 | btrfs_put_block_group(block_group); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 8633 | |
| 8634 | spin_lock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8635 | } |
| 8636 | spin_unlock(&info->block_group_cache_lock); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8637 | |
| 8638 | /* now that all the block groups are freed, go through and |
| 8639 | * free all the space_info structs. This is only called during |
| 8640 | * the final stages of unmount, and so we know nobody is |
| 8641 | * using them. We call synchronize_rcu() once before we start, |
| 8642 | * just to be on the safe side. |
| 8643 | */ |
| 8644 | synchronize_rcu(); |
| 8645 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 8646 | release_global_block_rsv(info); |
| 8647 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 8648 | while (!list_empty(&info->space_info)) { |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8649 | int i; |
| 8650 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8651 | space_info = list_entry(info->space_info.next, |
| 8652 | struct btrfs_space_info, |
| 8653 | list); |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 8654 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 8655 | if (WARN_ON(space_info->bytes_pinned > 0 || |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 8656 | space_info->bytes_reserved > 0 || |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 8657 | space_info->bytes_may_use > 0)) { |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 8658 | dump_space_info(space_info, 0, 0); |
| 8659 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8660 | } |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8661 | list_del(&space_info->list); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8662 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
| 8663 | struct kobject *kobj; |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8664 | kobj = space_info->block_group_kobjs[i]; |
| 8665 | space_info->block_group_kobjs[i] = NULL; |
| 8666 | if (kobj) { |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8667 | kobject_del(kobj); |
| 8668 | kobject_put(kobj); |
| 8669 | } |
| 8670 | } |
| 8671 | kobject_del(&space_info->kobj); |
| 8672 | kobject_put(&space_info->kobj); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8673 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8674 | return 0; |
| 8675 | } |
| 8676 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8677 | static void __link_block_group(struct btrfs_space_info *space_info, |
| 8678 | struct btrfs_block_group_cache *cache) |
| 8679 | { |
| 8680 | int index = get_block_group_index(cache); |
Jeff Mahoney | ed55b6a | 2014-03-26 14:11:26 -0400 | [diff] [blame] | 8681 | bool first = false; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8682 | |
| 8683 | down_write(&space_info->groups_sem); |
Jeff Mahoney | ed55b6a | 2014-03-26 14:11:26 -0400 | [diff] [blame] | 8684 | if (list_empty(&space_info->block_groups[index])) |
| 8685 | first = true; |
| 8686 | list_add_tail(&cache->list, &space_info->block_groups[index]); |
| 8687 | up_write(&space_info->groups_sem); |
| 8688 | |
| 8689 | if (first) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8690 | struct raid_kobject *rkobj; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8691 | int ret; |
| 8692 | |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8693 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); |
| 8694 | if (!rkobj) |
| 8695 | goto out_err; |
| 8696 | rkobj->raid_type = index; |
| 8697 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); |
| 8698 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, |
| 8699 | "%s", get_raid_name(index)); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8700 | if (ret) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8701 | kobject_put(&rkobj->kobj); |
| 8702 | goto out_err; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8703 | } |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8704 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 8705 | } |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 8706 | |
| 8707 | return; |
| 8708 | out_err: |
| 8709 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8710 | } |
| 8711 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8712 | static struct btrfs_block_group_cache * |
| 8713 | btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) |
| 8714 | { |
| 8715 | struct btrfs_block_group_cache *cache; |
| 8716 | |
| 8717 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
| 8718 | if (!cache) |
| 8719 | return NULL; |
| 8720 | |
| 8721 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
| 8722 | GFP_NOFS); |
| 8723 | if (!cache->free_space_ctl) { |
| 8724 | kfree(cache); |
| 8725 | return NULL; |
| 8726 | } |
| 8727 | |
| 8728 | cache->key.objectid = start; |
| 8729 | cache->key.offset = size; |
| 8730 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
| 8731 | |
| 8732 | cache->sectorsize = root->sectorsize; |
| 8733 | cache->fs_info = root->fs_info; |
| 8734 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
| 8735 | &root->fs_info->mapping_tree, |
| 8736 | start); |
| 8737 | atomic_set(&cache->count, 1); |
| 8738 | spin_lock_init(&cache->lock); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 8739 | init_rwsem(&cache->data_rwsem); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8740 | INIT_LIST_HEAD(&cache->list); |
| 8741 | INIT_LIST_HEAD(&cache->cluster_list); |
| 8742 | INIT_LIST_HEAD(&cache->new_bg_list); |
| 8743 | btrfs_init_free_space_ctl(cache); |
| 8744 | |
| 8745 | return cache; |
| 8746 | } |
| 8747 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8748 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 8749 | { |
| 8750 | struct btrfs_path *path; |
| 8751 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8752 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 8753 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8754 | struct btrfs_space_info *space_info; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8755 | struct btrfs_key key; |
| 8756 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8757 | struct extent_buffer *leaf; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8758 | int need_clear = 0; |
| 8759 | u64 cache_gen; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 8760 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 8761 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8762 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8763 | key.offset = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8764 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8765 | path = btrfs_alloc_path(); |
| 8766 | if (!path) |
| 8767 | return -ENOMEM; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 8768 | path->reada = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8769 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 8770 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 8771 | if (btrfs_test_opt(root, SPACE_CACHE) && |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 8772 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8773 | need_clear = 1; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 8774 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 8775 | need_clear = 1; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8776 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 8777 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8778 | ret = find_first_block_group(root, path, &key); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8779 | if (ret > 0) |
| 8780 | break; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8781 | if (ret != 0) |
| 8782 | goto error; |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8783 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8784 | leaf = path->nodes[0]; |
| 8785 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8786 | |
| 8787 | cache = btrfs_create_block_group_cache(root, found_key.objectid, |
| 8788 | found_key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8789 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8790 | ret = -ENOMEM; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8791 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8792 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8793 | |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 8794 | if (need_clear) { |
| 8795 | /* |
| 8796 | * When we mount with old space cache, we need to |
| 8797 | * set BTRFS_DC_CLEAR and set dirty flag. |
| 8798 | * |
| 8799 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we |
| 8800 | * truncate the old free space cache inode and |
| 8801 | * setup a new one. |
| 8802 | * b) Setting 'dirty flag' makes sure that we flush |
| 8803 | * the new space cache info onto disk. |
| 8804 | */ |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8805 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 8806 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 8807 | cache->dirty = 1; |
| 8808 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8809 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8810 | read_extent_buffer(leaf, &cache->item, |
| 8811 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 8812 | sizeof(cache->item)); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8813 | cache->flags = btrfs_block_group_flags(&cache->item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8814 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8815 | key.objectid = found_key.objectid + found_key.offset; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8816 | btrfs_release_path(path); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8817 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8818 | /* |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8819 | * We need to exclude the super stripes now so that the space |
| 8820 | * info has super bytes accounted for, otherwise we'll think |
| 8821 | * we have more space than we actually do. |
| 8822 | */ |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8823 | ret = exclude_super_stripes(root, cache); |
| 8824 | if (ret) { |
| 8825 | /* |
| 8826 | * We may have excluded something, so call this just in |
| 8827 | * case. |
| 8828 | */ |
| 8829 | free_excluded_extents(root, cache); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8830 | btrfs_put_block_group(cache); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8831 | goto error; |
| 8832 | } |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8833 | |
| 8834 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8835 | * check for two cases, either we are full, and therefore |
| 8836 | * don't need to bother with the caching work since we won't |
| 8837 | * find any space, or we are empty, and we can just add all |
| 8838 | * the space in and be done with it. This saves us _alot_ of |
| 8839 | * time, particularly in the full case. |
| 8840 | */ |
| 8841 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8842 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8843 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8844 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8845 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8846 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8847 | cache->cached = BTRFS_CACHE_FINISHED; |
| 8848 | add_new_free_space(cache, root->fs_info, |
| 8849 | found_key.objectid, |
| 8850 | found_key.objectid + |
| 8851 | found_key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8852 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8853 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 8854 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8855 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 8856 | if (ret) { |
| 8857 | btrfs_remove_free_space_cache(cache); |
| 8858 | btrfs_put_block_group(cache); |
| 8859 | goto error; |
| 8860 | } |
| 8861 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8862 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 8863 | btrfs_block_group_used(&cache->item), |
| 8864 | &space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8865 | if (ret) { |
| 8866 | btrfs_remove_free_space_cache(cache); |
| 8867 | spin_lock(&info->block_group_cache_lock); |
| 8868 | rb_erase(&cache->cache_node, |
| 8869 | &info->block_group_cache_tree); |
| 8870 | spin_unlock(&info->block_group_cache_lock); |
| 8871 | btrfs_put_block_group(cache); |
| 8872 | goto error; |
| 8873 | } |
| 8874 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8875 | cache->space_info = space_info; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8876 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8877 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8878 | spin_unlock(&cache->space_info->lock); |
| 8879 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8880 | __link_block_group(space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8881 | |
Chris Mason | 75ccf47 | 2008-09-30 19:24:06 -0400 | [diff] [blame] | 8882 | set_avail_alloc_bits(root->fs_info, cache->flags); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 8883 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8884 | set_block_group_ro(cache, 1); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8885 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8886 | |
| 8887 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { |
| 8888 | if (!(get_alloc_profile(root, space_info->flags) & |
| 8889 | (BTRFS_BLOCK_GROUP_RAID10 | |
| 8890 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8891 | BTRFS_BLOCK_GROUP_RAID5 | |
| 8892 | BTRFS_BLOCK_GROUP_RAID6 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8893 | BTRFS_BLOCK_GROUP_DUP))) |
| 8894 | continue; |
| 8895 | /* |
| 8896 | * avoid allocating from un-mirrored block group if there are |
| 8897 | * mirrored block groups. |
| 8898 | */ |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 8899 | list_for_each_entry(cache, |
| 8900 | &space_info->block_groups[BTRFS_RAID_RAID0], |
| 8901 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8902 | set_block_group_ro(cache, 1); |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 8903 | list_for_each_entry(cache, |
| 8904 | &space_info->block_groups[BTRFS_RAID_SINGLE], |
| 8905 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8906 | set_block_group_ro(cache, 1); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8907 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8908 | |
| 8909 | init_global_block_rsv(info); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8910 | ret = 0; |
| 8911 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8912 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8913 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8914 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8915 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8916 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
| 8917 | struct btrfs_root *root) |
| 8918 | { |
| 8919 | struct btrfs_block_group_cache *block_group, *tmp; |
| 8920 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 8921 | struct btrfs_block_group_item item; |
| 8922 | struct btrfs_key key; |
| 8923 | int ret = 0; |
| 8924 | |
| 8925 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, |
| 8926 | new_bg_list) { |
| 8927 | list_del_init(&block_group->new_bg_list); |
| 8928 | |
| 8929 | if (ret) |
| 8930 | continue; |
| 8931 | |
| 8932 | spin_lock(&block_group->lock); |
| 8933 | memcpy(&item, &block_group->item, sizeof(item)); |
| 8934 | memcpy(&key, &block_group->key, sizeof(key)); |
| 8935 | spin_unlock(&block_group->lock); |
| 8936 | |
| 8937 | ret = btrfs_insert_item(trans, extent_root, &key, &item, |
| 8938 | sizeof(item)); |
| 8939 | if (ret) |
| 8940 | btrfs_abort_transaction(trans, extent_root, ret); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8941 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
| 8942 | key.objectid, key.offset); |
| 8943 | if (ret) |
| 8944 | btrfs_abort_transaction(trans, extent_root, ret); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8945 | } |
| 8946 | } |
| 8947 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8948 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 8949 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 8950 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8951 | u64 size) |
| 8952 | { |
| 8953 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8954 | struct btrfs_root *extent_root; |
| 8955 | struct btrfs_block_group_cache *cache; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8956 | |
| 8957 | extent_root = root->fs_info->extent_root; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8958 | |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 8959 | btrfs_set_log_full_commit(root->fs_info, trans); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 8960 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8961 | cache = btrfs_create_block_group_cache(root, chunk_offset, size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 8962 | if (!cache) |
| 8963 | return -ENOMEM; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8964 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8965 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8966 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8967 | btrfs_set_block_group_flags(&cache->item, type); |
| 8968 | |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8969 | cache->flags = type; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8970 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8971 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8972 | ret = exclude_super_stripes(root, cache); |
| 8973 | if (ret) { |
| 8974 | /* |
| 8975 | * We may have excluded something, so call this just in |
| 8976 | * case. |
| 8977 | */ |
| 8978 | free_excluded_extents(root, cache); |
Miao Xie | 920e4a5 | 2014-01-15 20:00:55 +0800 | [diff] [blame] | 8979 | btrfs_put_block_group(cache); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8980 | return ret; |
| 8981 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8982 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8983 | add_new_free_space(cache, root->fs_info, chunk_offset, |
| 8984 | chunk_offset + size); |
| 8985 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8986 | free_excluded_extents(root, cache); |
| 8987 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8988 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 8989 | if (ret) { |
| 8990 | btrfs_remove_free_space_cache(cache); |
| 8991 | btrfs_put_block_group(cache); |
| 8992 | return ret; |
| 8993 | } |
| 8994 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8995 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 8996 | &cache->space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8997 | if (ret) { |
| 8998 | btrfs_remove_free_space_cache(cache); |
| 8999 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 9000 | rb_erase(&cache->cache_node, |
| 9001 | &root->fs_info->block_group_cache_tree); |
| 9002 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 9003 | btrfs_put_block_group(cache); |
| 9004 | return ret; |
| 9005 | } |
Li Zefan | c7c144d | 2011-12-07 10:39:22 +0800 | [diff] [blame] | 9006 | update_global_block_rsv(root->fs_info); |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9007 | |
| 9008 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 9009 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 9010 | spin_unlock(&cache->space_info->lock); |
| 9011 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 9012 | __link_block_group(cache->space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9013 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 9014 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9015 | |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 9016 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 9017 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 9018 | return 0; |
| 9019 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9020 | |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9021 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 9022 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 9023 | u64 extra_flags = chunk_to_extended(flags) & |
| 9024 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9025 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 9026 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9027 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 9028 | fs_info->avail_data_alloc_bits &= ~extra_flags; |
| 9029 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 9030 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; |
| 9031 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 9032 | fs_info->avail_system_alloc_bits &= ~extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 9033 | write_sequnlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9034 | } |
| 9035 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9036 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
| 9037 | struct btrfs_root *root, u64 group_start) |
| 9038 | { |
| 9039 | struct btrfs_path *path; |
| 9040 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9041 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9042 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9043 | struct btrfs_key key; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9044 | struct inode *inode; |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9045 | struct kobject *kobj = NULL; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9046 | int ret; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9047 | int index; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9048 | int factor; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9049 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9050 | root = root->fs_info->extent_root; |
| 9051 | |
| 9052 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); |
| 9053 | BUG_ON(!block_group); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9054 | BUG_ON(!block_group->ro); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9055 | |
liubo | 9f7c43c | 2011-03-07 02:13:33 +0000 | [diff] [blame] | 9056 | /* |
| 9057 | * Free the reserved super bytes from this block group before |
| 9058 | * remove it. |
| 9059 | */ |
| 9060 | free_excluded_extents(root, block_group); |
| 9061 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9062 | memcpy(&key, &block_group->key, sizeof(key)); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9063 | index = get_block_group_index(block_group); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9064 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 9065 | BTRFS_BLOCK_GROUP_RAID1 | |
| 9066 | BTRFS_BLOCK_GROUP_RAID10)) |
| 9067 | factor = 2; |
| 9068 | else |
| 9069 | factor = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9070 | |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9071 | /* make sure this block group isn't part of an allocation cluster */ |
| 9072 | cluster = &root->fs_info->data_alloc_cluster; |
| 9073 | spin_lock(&cluster->refill_lock); |
| 9074 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 9075 | spin_unlock(&cluster->refill_lock); |
| 9076 | |
| 9077 | /* |
| 9078 | * make sure this block group isn't part of a metadata |
| 9079 | * allocation cluster |
| 9080 | */ |
| 9081 | cluster = &root->fs_info->meta_alloc_cluster; |
| 9082 | spin_lock(&cluster->refill_lock); |
| 9083 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 9084 | spin_unlock(&cluster->refill_lock); |
| 9085 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9086 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 9087 | if (!path) { |
| 9088 | ret = -ENOMEM; |
| 9089 | goto out; |
| 9090 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9091 | |
Ilya Dryomov | 10b2f34 | 2011-10-02 13:56:53 +0300 | [diff] [blame] | 9092 | inode = lookup_free_space_inode(tree_root, block_group, path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9093 | if (!IS_ERR(inode)) { |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 9094 | ret = btrfs_orphan_add(trans, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 9095 | if (ret) { |
| 9096 | btrfs_add_delayed_iput(inode); |
| 9097 | goto out; |
| 9098 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9099 | clear_nlink(inode); |
| 9100 | /* One for the block groups ref */ |
| 9101 | spin_lock(&block_group->lock); |
| 9102 | if (block_group->iref) { |
| 9103 | block_group->iref = 0; |
| 9104 | block_group->inode = NULL; |
| 9105 | spin_unlock(&block_group->lock); |
| 9106 | iput(inode); |
| 9107 | } else { |
| 9108 | spin_unlock(&block_group->lock); |
| 9109 | } |
| 9110 | /* One for our lookup ref */ |
Josef Bacik | 455757c | 2011-09-19 12:26:24 -0400 | [diff] [blame] | 9111 | btrfs_add_delayed_iput(inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9112 | } |
| 9113 | |
| 9114 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 9115 | key.offset = block_group->key.objectid; |
| 9116 | key.type = 0; |
| 9117 | |
| 9118 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); |
| 9119 | if (ret < 0) |
| 9120 | goto out; |
| 9121 | if (ret > 0) |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 9122 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9123 | if (ret == 0) { |
| 9124 | ret = btrfs_del_item(trans, tree_root, path); |
| 9125 | if (ret) |
| 9126 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 9127 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9128 | } |
| 9129 | |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 9130 | spin_lock(&root->fs_info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9131 | rb_erase(&block_group->cache_node, |
| 9132 | &root->fs_info->block_group_cache_tree); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 9133 | |
| 9134 | if (root->fs_info->first_logical_byte == block_group->key.objectid) |
| 9135 | root->fs_info->first_logical_byte = (u64)-1; |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 9136 | spin_unlock(&root->fs_info->block_group_cache_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9137 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9138 | down_write(&block_group->space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 9139 | /* |
| 9140 | * we must use list_del_init so people can check to see if they |
| 9141 | * are still on the list after taking the semaphore |
| 9142 | */ |
| 9143 | list_del_init(&block_group->list); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9144 | if (list_empty(&block_group->space_info->block_groups[index])) { |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9145 | kobj = block_group->space_info->block_group_kobjs[index]; |
| 9146 | block_group->space_info->block_group_kobjs[index] = NULL; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 9147 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
Jeff Mahoney | 6ab0a20 | 2013-11-01 13:07:04 -0400 | [diff] [blame] | 9148 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 9149 | up_write(&block_group->space_info->groups_sem); |
Jeff Mahoney | c189544 | 2014-05-27 12:59:57 -0400 | [diff] [blame] | 9150 | if (kobj) { |
| 9151 | kobject_del(kobj); |
| 9152 | kobject_put(kobj); |
| 9153 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9154 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9155 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 9156 | wait_block_group_cache_done(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 9157 | |
| 9158 | btrfs_remove_free_space_cache(block_group); |
| 9159 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9160 | spin_lock(&block_group->space_info->lock); |
| 9161 | block_group->space_info->total_bytes -= block_group->key.offset; |
| 9162 | block_group->space_info->bytes_readonly -= block_group->key.offset; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 9163 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9164 | spin_unlock(&block_group->space_info->lock); |
Chris Mason | 283bb19 | 2009-07-24 16:30:55 -0400 | [diff] [blame] | 9165 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 9166 | memcpy(&key, &block_group->key, sizeof(key)); |
| 9167 | |
Chris Mason | 283bb19 | 2009-07-24 16:30:55 -0400 | [diff] [blame] | 9168 | btrfs_clear_space_info_full(root->fs_info); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 9169 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 9170 | btrfs_put_block_group(block_group); |
| 9171 | btrfs_put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 9172 | |
| 9173 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 9174 | if (ret > 0) |
| 9175 | ret = -EIO; |
| 9176 | if (ret < 0) |
| 9177 | goto out; |
| 9178 | |
| 9179 | ret = btrfs_del_item(trans, root, path); |
| 9180 | out: |
| 9181 | btrfs_free_path(path); |
| 9182 | return ret; |
| 9183 | } |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 9184 | |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9185 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
| 9186 | { |
| 9187 | struct btrfs_space_info *space_info; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9188 | struct btrfs_super_block *disk_super; |
| 9189 | u64 features; |
| 9190 | u64 flags; |
| 9191 | int mixed = 0; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9192 | int ret; |
| 9193 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 9194 | disk_super = fs_info->super_copy; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9195 | if (!btrfs_super_root(disk_super)) |
| 9196 | return 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9197 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9198 | features = btrfs_super_incompat_flags(disk_super); |
| 9199 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) |
| 9200 | mixed = 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9201 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9202 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 9203 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9204 | if (ret) |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9205 | goto out; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9206 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 9207 | if (mixed) { |
| 9208 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; |
| 9209 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 9210 | } else { |
| 9211 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 9212 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 9213 | if (ret) |
| 9214 | goto out; |
| 9215 | |
| 9216 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 9217 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 9218 | } |
| 9219 | out: |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 9220 | return ret; |
| 9221 | } |
| 9222 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 9223 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
| 9224 | { |
| 9225 | return unpin_extent_range(root, start, end); |
| 9226 | } |
| 9227 | |
| 9228 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 9229 | u64 num_bytes, u64 *actual_bytes) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 9230 | { |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 9231 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 9232 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 9233 | |
| 9234 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) |
| 9235 | { |
| 9236 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 9237 | struct btrfs_block_group_cache *cache = NULL; |
| 9238 | u64 group_trimmed; |
| 9239 | u64 start; |
| 9240 | u64 end; |
| 9241 | u64 trimmed = 0; |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 9242 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 9243 | int ret = 0; |
| 9244 | |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 9245 | /* |
| 9246 | * try to trim all FS space, our block group may start from non-zero. |
| 9247 | */ |
| 9248 | if (range->len == total_bytes) |
| 9249 | cache = btrfs_lookup_first_block_group(fs_info, range->start); |
| 9250 | else |
| 9251 | cache = btrfs_lookup_block_group(fs_info, range->start); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 9252 | |
| 9253 | while (cache) { |
| 9254 | if (cache->key.objectid >= (range->start + range->len)) { |
| 9255 | btrfs_put_block_group(cache); |
| 9256 | break; |
| 9257 | } |
| 9258 | |
| 9259 | start = max(range->start, cache->key.objectid); |
| 9260 | end = min(range->start + range->len, |
| 9261 | cache->key.objectid + cache->key.offset); |
| 9262 | |
| 9263 | if (end - start >= range->minlen) { |
| 9264 | if (!block_group_cache_done(cache)) { |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 9265 | ret = cache_block_group(cache, 0); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 9266 | if (ret) { |
| 9267 | btrfs_put_block_group(cache); |
| 9268 | break; |
| 9269 | } |
| 9270 | ret = wait_block_group_cache_done(cache); |
| 9271 | if (ret) { |
| 9272 | btrfs_put_block_group(cache); |
| 9273 | break; |
| 9274 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 9275 | } |
| 9276 | ret = btrfs_trim_block_group(cache, |
| 9277 | &group_trimmed, |
| 9278 | start, |
| 9279 | end, |
| 9280 | range->minlen); |
| 9281 | |
| 9282 | trimmed += group_trimmed; |
| 9283 | if (ret) { |
| 9284 | btrfs_put_block_group(cache); |
| 9285 | break; |
| 9286 | } |
| 9287 | } |
| 9288 | |
| 9289 | cache = next_block_group(fs_info->tree_root, cache); |
| 9290 | } |
| 9291 | |
| 9292 | range->len = trimmed; |
| 9293 | return ret; |
| 9294 | } |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 9295 | |
| 9296 | /* |
| 9297 | * btrfs_{start,end}_write() is similar to mnt_{want, drop}_write(), |
| 9298 | * they are used to prevent the some tasks writing data into the page cache |
| 9299 | * by nocow before the subvolume is snapshoted, but flush the data into |
| 9300 | * the disk after the snapshot creation. |
| 9301 | */ |
| 9302 | void btrfs_end_nocow_write(struct btrfs_root *root) |
| 9303 | { |
| 9304 | percpu_counter_dec(&root->subv_writers->counter); |
| 9305 | /* |
| 9306 | * Make sure counter is updated before we wake up |
| 9307 | * waiters. |
| 9308 | */ |
| 9309 | smp_mb(); |
| 9310 | if (waitqueue_active(&root->subv_writers->wait)) |
| 9311 | wake_up(&root->subv_writers->wait); |
| 9312 | } |
| 9313 | |
| 9314 | int btrfs_start_nocow_write(struct btrfs_root *root) |
| 9315 | { |
| 9316 | if (unlikely(atomic_read(&root->will_be_snapshoted))) |
| 9317 | return 0; |
| 9318 | |
| 9319 | percpu_counter_inc(&root->subv_writers->counter); |
| 9320 | /* |
| 9321 | * Make sure counter is updated before we check for snapshot creation. |
| 9322 | */ |
| 9323 | smp_mb(); |
| 9324 | if (unlikely(atomic_read(&root->will_be_snapshoted))) { |
| 9325 | btrfs_end_nocow_write(root); |
| 9326 | return 0; |
| 9327 | } |
| 9328 | return 1; |
| 9329 | } |