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 | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 28 | #include "compat.h" |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 29 | #include "hash.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 30 | #include "ctree.h" |
| 31 | #include "disk-io.h" |
| 32 | #include "print-tree.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 33 | #include "transaction.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 34 | #include "volumes.h" |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 35 | #include "raid56.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 36 | #include "locking.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 37 | #include "free-space-cache.h" |
Miao Xie | 3fed40c | 2012-09-13 04:51:36 -0600 | [diff] [blame] | 38 | #include "math.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, |
| 84 | struct btrfs_delayed_extent_op *extra_op); |
| 85 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 86 | struct extent_buffer *leaf, |
| 87 | struct btrfs_extent_item *ei); |
| 88 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 89 | struct btrfs_root *root, |
| 90 | u64 parent, u64 root_objectid, |
| 91 | u64 flags, u64 owner, u64 offset, |
| 92 | struct btrfs_key *ins, int ref_mod); |
| 93 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 94 | struct btrfs_root *root, |
| 95 | u64 parent, u64 root_objectid, |
| 96 | u64 flags, struct btrfs_disk_key *key, |
| 97 | int level, struct btrfs_key *ins); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 98 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 99 | struct btrfs_root *extent_root, u64 flags, |
| 100 | int force); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 101 | static int find_next_key(struct btrfs_path *path, int level, |
| 102 | struct btrfs_key *key); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 103 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 104 | int dump_block_groups); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 105 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
| 106 | u64 num_bytes, int reserve); |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 107 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 108 | u64 num_bytes); |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 109 | int btrfs_pin_extent(struct btrfs_root *root, |
| 110 | u64 bytenr, u64 num_bytes, int reserved); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 111 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 112 | static noinline int |
| 113 | block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 114 | { |
| 115 | smp_mb(); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 116 | return cache->cached == BTRFS_CACHE_FINISHED || |
| 117 | cache->cached == BTRFS_CACHE_ERROR; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 118 | } |
| 119 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 120 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 121 | { |
| 122 | return (cache->flags & bits) == bits; |
| 123 | } |
| 124 | |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 125 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 126 | { |
| 127 | atomic_inc(&cache->count); |
| 128 | } |
| 129 | |
| 130 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) |
| 131 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 132 | if (atomic_dec_and_test(&cache->count)) { |
| 133 | WARN_ON(cache->pinned > 0); |
| 134 | WARN_ON(cache->reserved > 0); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 135 | kfree(cache->free_space_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 136 | kfree(cache); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 137 | } |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 138 | } |
| 139 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 140 | /* |
| 141 | * this adds the block group to the fs_info rb tree for the block group |
| 142 | * cache |
| 143 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 144 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 145 | struct btrfs_block_group_cache *block_group) |
| 146 | { |
| 147 | struct rb_node **p; |
| 148 | struct rb_node *parent = NULL; |
| 149 | struct btrfs_block_group_cache *cache; |
| 150 | |
| 151 | spin_lock(&info->block_group_cache_lock); |
| 152 | p = &info->block_group_cache_tree.rb_node; |
| 153 | |
| 154 | while (*p) { |
| 155 | parent = *p; |
| 156 | cache = rb_entry(parent, struct btrfs_block_group_cache, |
| 157 | cache_node); |
| 158 | if (block_group->key.objectid < cache->key.objectid) { |
| 159 | p = &(*p)->rb_left; |
| 160 | } else if (block_group->key.objectid > cache->key.objectid) { |
| 161 | p = &(*p)->rb_right; |
| 162 | } else { |
| 163 | spin_unlock(&info->block_group_cache_lock); |
| 164 | return -EEXIST; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | rb_link_node(&block_group->cache_node, parent, p); |
| 169 | rb_insert_color(&block_group->cache_node, |
| 170 | &info->block_group_cache_tree); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 171 | |
| 172 | if (info->first_logical_byte > block_group->key.objectid) |
| 173 | info->first_logical_byte = block_group->key.objectid; |
| 174 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 175 | spin_unlock(&info->block_group_cache_lock); |
| 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * This will return the block group at or after bytenr if contains is 0, else |
| 182 | * it will return the block group that contains the bytenr |
| 183 | */ |
| 184 | static struct btrfs_block_group_cache * |
| 185 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, |
| 186 | int contains) |
| 187 | { |
| 188 | struct btrfs_block_group_cache *cache, *ret = NULL; |
| 189 | struct rb_node *n; |
| 190 | u64 end, start; |
| 191 | |
| 192 | spin_lock(&info->block_group_cache_lock); |
| 193 | n = info->block_group_cache_tree.rb_node; |
| 194 | |
| 195 | while (n) { |
| 196 | cache = rb_entry(n, struct btrfs_block_group_cache, |
| 197 | cache_node); |
| 198 | end = cache->key.objectid + cache->key.offset - 1; |
| 199 | start = cache->key.objectid; |
| 200 | |
| 201 | if (bytenr < start) { |
| 202 | if (!contains && (!ret || start < ret->key.objectid)) |
| 203 | ret = cache; |
| 204 | n = n->rb_left; |
| 205 | } else if (bytenr > start) { |
| 206 | if (contains && bytenr <= end) { |
| 207 | ret = cache; |
| 208 | break; |
| 209 | } |
| 210 | n = n->rb_right; |
| 211 | } else { |
| 212 | ret = cache; |
| 213 | break; |
| 214 | } |
| 215 | } |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 216 | if (ret) { |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 217 | btrfs_get_block_group(ret); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 218 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
| 219 | info->first_logical_byte = ret->key.objectid; |
| 220 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 221 | spin_unlock(&info->block_group_cache_lock); |
| 222 | |
| 223 | return ret; |
| 224 | } |
| 225 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 226 | static int add_excluded_extent(struct btrfs_root *root, |
| 227 | u64 start, u64 num_bytes) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 228 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 229 | u64 end = start + num_bytes - 1; |
| 230 | set_extent_bits(&root->fs_info->freed_extents[0], |
| 231 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 232 | set_extent_bits(&root->fs_info->freed_extents[1], |
| 233 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 234 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 235 | } |
| 236 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 237 | static void free_excluded_extents(struct btrfs_root *root, |
| 238 | struct btrfs_block_group_cache *cache) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 239 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 240 | u64 start, end; |
| 241 | |
| 242 | start = cache->key.objectid; |
| 243 | end = start + cache->key.offset - 1; |
| 244 | |
| 245 | clear_extent_bits(&root->fs_info->freed_extents[0], |
| 246 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 247 | clear_extent_bits(&root->fs_info->freed_extents[1], |
| 248 | start, end, EXTENT_UPTODATE, GFP_NOFS); |
| 249 | } |
| 250 | |
| 251 | static int exclude_super_stripes(struct btrfs_root *root, |
| 252 | struct btrfs_block_group_cache *cache) |
| 253 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 254 | u64 bytenr; |
| 255 | u64 *logical; |
| 256 | int stripe_len; |
| 257 | int i, nr, ret; |
| 258 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 259 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
| 260 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; |
| 261 | cache->bytes_super += stripe_len; |
| 262 | ret = add_excluded_extent(root, cache->key.objectid, |
| 263 | stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 264 | if (ret) |
| 265 | return ret; |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 266 | } |
| 267 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 268 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 269 | bytenr = btrfs_sb_offset(i); |
| 270 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| 271 | cache->key.objectid, bytenr, |
| 272 | 0, &logical, &nr, &stripe_len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 273 | if (ret) |
| 274 | return ret; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 275 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 276 | while (nr--) { |
Josef Bacik | 51bf5f0 | 2013-04-23 12:55:21 -0400 | [diff] [blame] | 277 | u64 start, len; |
| 278 | |
| 279 | if (logical[nr] > cache->key.objectid + |
| 280 | cache->key.offset) |
| 281 | continue; |
| 282 | |
| 283 | if (logical[nr] + stripe_len <= cache->key.objectid) |
| 284 | continue; |
| 285 | |
| 286 | start = logical[nr]; |
| 287 | if (start < cache->key.objectid) { |
| 288 | start = cache->key.objectid; |
| 289 | len = (logical[nr] + stripe_len) - start; |
| 290 | } else { |
| 291 | len = min_t(u64, stripe_len, |
| 292 | cache->key.objectid + |
| 293 | cache->key.offset - start); |
| 294 | } |
| 295 | |
| 296 | cache->bytes_super += len; |
| 297 | ret = add_excluded_extent(root, start, len); |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 298 | if (ret) { |
| 299 | kfree(logical); |
| 300 | return ret; |
| 301 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 302 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 303 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 304 | kfree(logical); |
| 305 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 306 | return 0; |
| 307 | } |
| 308 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 309 | static struct btrfs_caching_control * |
| 310 | get_caching_control(struct btrfs_block_group_cache *cache) |
| 311 | { |
| 312 | struct btrfs_caching_control *ctl; |
| 313 | |
| 314 | spin_lock(&cache->lock); |
| 315 | if (cache->cached != BTRFS_CACHE_STARTED) { |
| 316 | spin_unlock(&cache->lock); |
| 317 | return NULL; |
| 318 | } |
| 319 | |
Josef Bacik | dde5abe | 2010-09-16 16:17:03 -0400 | [diff] [blame] | 320 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
| 321 | if (!cache->caching_ctl) { |
| 322 | spin_unlock(&cache->lock); |
| 323 | return NULL; |
| 324 | } |
| 325 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 326 | ctl = cache->caching_ctl; |
| 327 | atomic_inc(&ctl->count); |
| 328 | spin_unlock(&cache->lock); |
| 329 | return ctl; |
| 330 | } |
| 331 | |
| 332 | static void put_caching_control(struct btrfs_caching_control *ctl) |
| 333 | { |
| 334 | if (atomic_dec_and_test(&ctl->count)) |
| 335 | kfree(ctl); |
| 336 | } |
| 337 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 338 | /* |
| 339 | * this is only called by cache_block_group, since we could have freed extents |
| 340 | * we need to check the pinned_extents for any extents that can't be used yet |
| 341 | * since their free space will be released as soon as the transaction commits. |
| 342 | */ |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 343 | 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] | 344 | struct btrfs_fs_info *info, u64 start, u64 end) |
| 345 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 346 | u64 extent_start, extent_end, size, total_added = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 347 | int ret; |
| 348 | |
| 349 | while (start < end) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 350 | ret = find_first_extent_bit(info->pinned_extents, start, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 351 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 352 | EXTENT_DIRTY | EXTENT_UPTODATE, |
| 353 | NULL); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 354 | if (ret) |
| 355 | break; |
| 356 | |
Yan, Zheng | 06b2331 | 2009-11-26 09:31:11 +0000 | [diff] [blame] | 357 | if (extent_start <= start) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 358 | start = extent_end + 1; |
| 359 | } else if (extent_start > start && extent_start < end) { |
| 360 | size = extent_start - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 361 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 362 | ret = btrfs_add_free_space(block_group, start, |
| 363 | size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 364 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 365 | start = extent_end + 1; |
| 366 | } else { |
| 367 | break; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | if (start < end) { |
| 372 | size = end - start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 373 | total_added += size; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 374 | ret = btrfs_add_free_space(block_group, start, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 375 | BUG_ON(ret); /* -ENOMEM or logic error */ |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 376 | } |
| 377 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 378 | return total_added; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 379 | } |
| 380 | |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 381 | static noinline void caching_thread(struct btrfs_work *work) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 382 | { |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 383 | struct btrfs_block_group_cache *block_group; |
| 384 | struct btrfs_fs_info *fs_info; |
| 385 | struct btrfs_caching_control *caching_ctl; |
| 386 | struct btrfs_root *extent_root; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 387 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 388 | struct extent_buffer *leaf; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 389 | struct btrfs_key key; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 390 | u64 total_found = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 391 | u64 last = 0; |
| 392 | u32 nritems; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 393 | int ret = -ENOMEM; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 394 | |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 395 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
| 396 | block_group = caching_ctl->block_group; |
| 397 | fs_info = block_group->fs_info; |
| 398 | extent_root = fs_info->extent_root; |
| 399 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 400 | path = btrfs_alloc_path(); |
| 401 | if (!path) |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 402 | goto out; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 403 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 404 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 405 | |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 406 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 407 | * We don't want to deadlock with somebody trying to allocate a new |
| 408 | * extent for the extent root while also trying to search the extent |
| 409 | * root to add free space. So we skip locking and search the commit |
| 410 | * root, since its read-only |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 411 | */ |
| 412 | path->skip_locking = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 413 | path->search_commit_root = 1; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 414 | path->reada = 1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 415 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 416 | key.objectid = last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 417 | key.offset = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 418 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 419 | again: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 420 | mutex_lock(&caching_ctl->mutex); |
Chris Mason | 013f1b1 | 2009-07-31 14:57:55 -0400 | [diff] [blame] | 421 | /* need to make sure the commit_root doesn't disappear */ |
| 422 | down_read(&fs_info->extent_commit_sem); |
| 423 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 424 | next: |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 425 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 426 | if (ret < 0) |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 427 | goto err; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 428 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 429 | leaf = path->nodes[0]; |
| 430 | nritems = btrfs_header_nritems(leaf); |
| 431 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 432 | while (1) { |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 433 | if (btrfs_fs_closing(fs_info) > 1) { |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 434 | last = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 435 | break; |
Yan Zheng | f25784b | 2009-07-28 08:41:57 -0400 | [diff] [blame] | 436 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 437 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 438 | if (path->slots[0] < nritems) { |
| 439 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 440 | } else { |
| 441 | ret = find_next_key(path, 0, &key); |
| 442 | if (ret) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 443 | break; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 444 | |
Josef Bacik | 0a3896d | 2013-04-19 14:37:26 -0400 | [diff] [blame] | 445 | if (need_resched()) { |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 446 | caching_ctl->progress = last; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 447 | btrfs_release_path(path); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 448 | up_read(&fs_info->extent_commit_sem); |
| 449 | mutex_unlock(&caching_ctl->mutex); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 450 | cond_resched(); |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 451 | goto again; |
| 452 | } |
Josef Bacik | 0a3896d | 2013-04-19 14:37:26 -0400 | [diff] [blame] | 453 | |
| 454 | ret = btrfs_next_leaf(extent_root, path); |
| 455 | if (ret < 0) |
| 456 | goto err; |
| 457 | if (ret) |
| 458 | break; |
Josef Bacik | 589d8ad | 2011-05-11 17:30:53 -0400 | [diff] [blame] | 459 | leaf = path->nodes[0]; |
| 460 | nritems = btrfs_header_nritems(leaf); |
| 461 | continue; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 462 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 463 | |
Liu Bo | 52ee28d | 2013-07-11 17:51:15 +0800 | [diff] [blame] | 464 | if (key.objectid < last) { |
| 465 | key.objectid = last; |
| 466 | key.offset = 0; |
| 467 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 468 | |
| 469 | caching_ctl->progress = last; |
| 470 | btrfs_release_path(path); |
| 471 | goto next; |
| 472 | } |
| 473 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 474 | if (key.objectid < block_group->key.objectid) { |
| 475 | path->slots[0]++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 476 | continue; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 477 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 478 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 479 | if (key.objectid >= block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 480 | block_group->key.offset) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 481 | break; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 482 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 483 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
| 484 | key.type == BTRFS_METADATA_ITEM_KEY) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 485 | total_found += add_new_free_space(block_group, |
| 486 | fs_info, last, |
| 487 | key.objectid); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 488 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
| 489 | last = key.objectid + |
| 490 | fs_info->tree_root->leafsize; |
| 491 | else |
| 492 | last = key.objectid + key.offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 493 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 494 | if (total_found > (1024 * 1024 * 2)) { |
| 495 | total_found = 0; |
| 496 | wake_up(&caching_ctl->wait); |
| 497 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 498 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 499 | path->slots[0]++; |
| 500 | } |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 501 | ret = 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 502 | |
| 503 | total_found += add_new_free_space(block_group, fs_info, last, |
| 504 | block_group->key.objectid + |
| 505 | block_group->key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 506 | caching_ctl->progress = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 507 | |
| 508 | spin_lock(&block_group->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 509 | block_group->caching_ctl = NULL; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 510 | block_group->cached = BTRFS_CACHE_FINISHED; |
| 511 | spin_unlock(&block_group->lock); |
| 512 | |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 513 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 514 | btrfs_free_path(path); |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 515 | up_read(&fs_info->extent_commit_sem); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 516 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 517 | free_excluded_extents(extent_root, block_group); |
| 518 | |
| 519 | mutex_unlock(&caching_ctl->mutex); |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 520 | out: |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 521 | if (ret) { |
| 522 | spin_lock(&block_group->lock); |
| 523 | block_group->caching_ctl = NULL; |
| 524 | block_group->cached = BTRFS_CACHE_ERROR; |
| 525 | spin_unlock(&block_group->lock); |
| 526 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 527 | wake_up(&caching_ctl->wait); |
| 528 | |
| 529 | put_caching_control(caching_ctl); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 530 | btrfs_put_block_group(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 531 | } |
| 532 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 533 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 534 | int load_cache_only) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 535 | { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 536 | DEFINE_WAIT(wait); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 537 | struct btrfs_fs_info *fs_info = cache->fs_info; |
| 538 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 539 | int ret = 0; |
| 540 | |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 541 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 542 | if (!caching_ctl) |
| 543 | return -ENOMEM; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 544 | |
| 545 | INIT_LIST_HEAD(&caching_ctl->list); |
| 546 | mutex_init(&caching_ctl->mutex); |
| 547 | init_waitqueue_head(&caching_ctl->wait); |
| 548 | caching_ctl->block_group = cache; |
| 549 | caching_ctl->progress = cache->key.objectid; |
| 550 | atomic_set(&caching_ctl->count, 1); |
| 551 | caching_ctl->work.func = caching_thread; |
| 552 | |
| 553 | spin_lock(&cache->lock); |
| 554 | /* |
| 555 | * This should be a rare occasion, but this could happen I think in the |
| 556 | * case where one thread starts to load the space cache info, and then |
| 557 | * some other thread starts a transaction commit which tries to do an |
| 558 | * allocation while the other thread is still loading the space cache |
| 559 | * info. The previous loop should have kept us from choosing this block |
| 560 | * group, but if we've moved to the state where we will wait on caching |
| 561 | * block groups we need to first check if we're doing a fast load here, |
| 562 | * so we can wait for it to finish, otherwise we could end up allocating |
| 563 | * from a block group who's cache gets evicted for one reason or |
| 564 | * another. |
| 565 | */ |
| 566 | while (cache->cached == BTRFS_CACHE_FAST) { |
| 567 | struct btrfs_caching_control *ctl; |
| 568 | |
| 569 | ctl = cache->caching_ctl; |
| 570 | atomic_inc(&ctl->count); |
| 571 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); |
| 572 | spin_unlock(&cache->lock); |
| 573 | |
| 574 | schedule(); |
| 575 | |
| 576 | finish_wait(&ctl->wait, &wait); |
| 577 | put_caching_control(ctl); |
| 578 | spin_lock(&cache->lock); |
| 579 | } |
| 580 | |
| 581 | if (cache->cached != BTRFS_CACHE_NO) { |
| 582 | spin_unlock(&cache->lock); |
| 583 | kfree(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 584 | return 0; |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 585 | } |
| 586 | WARN_ON(cache->caching_ctl); |
| 587 | cache->caching_ctl = caching_ctl; |
| 588 | cache->cached = BTRFS_CACHE_FAST; |
| 589 | spin_unlock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 590 | |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 591 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 592 | ret = load_free_space_cache(fs_info, cache); |
| 593 | |
| 594 | spin_lock(&cache->lock); |
| 595 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 596 | cache->caching_ctl = NULL; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 597 | cache->cached = BTRFS_CACHE_FINISHED; |
| 598 | cache->last_byte_to_unpin = (u64)-1; |
| 599 | } else { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 600 | if (load_cache_only) { |
| 601 | cache->caching_ctl = NULL; |
| 602 | cache->cached = BTRFS_CACHE_NO; |
| 603 | } else { |
| 604 | cache->cached = BTRFS_CACHE_STARTED; |
| 605 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 606 | } |
| 607 | spin_unlock(&cache->lock); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 608 | wake_up(&caching_ctl->wait); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 609 | if (ret == 1) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 610 | put_caching_control(caching_ctl); |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 611 | free_excluded_extents(fs_info->extent_root, cache); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 612 | return 0; |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 613 | } |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 614 | } else { |
| 615 | /* |
| 616 | * We are not going to do the fast caching, set cached to the |
| 617 | * appropriate value and wakeup any waiters. |
| 618 | */ |
| 619 | spin_lock(&cache->lock); |
| 620 | if (load_cache_only) { |
| 621 | cache->caching_ctl = NULL; |
| 622 | cache->cached = BTRFS_CACHE_NO; |
| 623 | } else { |
| 624 | cache->cached = BTRFS_CACHE_STARTED; |
| 625 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 626 | spin_unlock(&cache->lock); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 627 | wake_up(&caching_ctl->wait); |
| 628 | } |
| 629 | |
| 630 | if (load_cache_only) { |
| 631 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 632 | return 0; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 633 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 634 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 635 | down_write(&fs_info->extent_commit_sem); |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 636 | atomic_inc(&caching_ctl->count); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 637 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
| 638 | up_write(&fs_info->extent_commit_sem); |
| 639 | |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 640 | btrfs_get_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 641 | |
Josef Bacik | bab39bf | 2011-06-30 14:42:28 -0400 | [diff] [blame] | 642 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 643 | |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 644 | return ret; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 645 | } |
| 646 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 647 | /* |
| 648 | * return the block group that starts at or after bytenr |
| 649 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 650 | static struct btrfs_block_group_cache * |
| 651 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 652 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 653 | struct btrfs_block_group_cache *cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 654 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 655 | cache = block_group_cache_tree_search(info, bytenr, 0); |
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 | return cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 658 | } |
| 659 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 660 | /* |
Sankar P | 9f55684 | 2009-05-14 13:52:22 -0400 | [diff] [blame] | 661 | * return the block group that contains the given bytenr |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 662 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 663 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| 664 | struct btrfs_fs_info *info, |
| 665 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 666 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 667 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 668 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 669 | cache = block_group_cache_tree_search(info, bytenr, 1); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 670 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 671 | return cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 672 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 673 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 674 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 675 | u64 flags) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 676 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 677 | struct list_head *head = &info->space_info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 678 | struct btrfs_space_info *found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 679 | |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 680 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 681 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 682 | rcu_read_lock(); |
| 683 | list_for_each_entry_rcu(found, head, list) { |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 684 | if (found->flags & flags) { |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 685 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 686 | return found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 687 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 688 | } |
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 NULL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 691 | } |
| 692 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 693 | /* |
| 694 | * after adding space to the filesystem, we need to clear the full flags |
| 695 | * on all the space infos. |
| 696 | */ |
| 697 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) |
| 698 | { |
| 699 | struct list_head *head = &info->space_info; |
| 700 | struct btrfs_space_info *found; |
| 701 | |
| 702 | rcu_read_lock(); |
| 703 | list_for_each_entry_rcu(found, head, list) |
| 704 | found->full = 0; |
| 705 | rcu_read_unlock(); |
| 706 | } |
| 707 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 708 | /* simple helper to search for an existing extent at a given offset */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 709 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 710 | { |
| 711 | int ret; |
| 712 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 713 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 714 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 715 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 716 | if (!path) |
| 717 | return -ENOMEM; |
| 718 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 719 | key.objectid = start; |
| 720 | key.offset = len; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 721 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 722 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
| 723 | 0, 0); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 724 | if (ret > 0) { |
| 725 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 726 | if (key.objectid == start && |
| 727 | key.type == BTRFS_METADATA_ITEM_KEY) |
| 728 | ret = 0; |
| 729 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 730 | btrfs_free_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 731 | return ret; |
| 732 | } |
| 733 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 734 | /* |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 735 | * helper function to lookup reference count and flags of a tree block. |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 736 | * |
| 737 | * the head node for delayed ref is used to store the sum of all the |
| 738 | * reference count modifications queued up in the rbtree. the head |
| 739 | * node may also store the extent flags to set. This way you can check |
| 740 | * to see what the reference count and extent flags would be if all of |
| 741 | * the delayed refs are not processed. |
| 742 | */ |
| 743 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, |
| 744 | struct btrfs_root *root, u64 bytenr, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 745 | u64 offset, int metadata, u64 *refs, u64 *flags) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 746 | { |
| 747 | struct btrfs_delayed_ref_head *head; |
| 748 | struct btrfs_delayed_ref_root *delayed_refs; |
| 749 | struct btrfs_path *path; |
| 750 | struct btrfs_extent_item *ei; |
| 751 | struct extent_buffer *leaf; |
| 752 | struct btrfs_key key; |
| 753 | u32 item_size; |
| 754 | u64 num_refs; |
| 755 | u64 extent_flags; |
| 756 | int ret; |
| 757 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 758 | /* |
| 759 | * If we don't have skinny metadata, don't bother doing anything |
| 760 | * different |
| 761 | */ |
| 762 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { |
| 763 | offset = root->leafsize; |
| 764 | metadata = 0; |
| 765 | } |
| 766 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 767 | path = btrfs_alloc_path(); |
| 768 | if (!path) |
| 769 | return -ENOMEM; |
| 770 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 771 | if (metadata) { |
| 772 | key.objectid = bytenr; |
| 773 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 774 | key.offset = offset; |
| 775 | } else { |
| 776 | key.objectid = bytenr; |
| 777 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 778 | key.offset = offset; |
| 779 | } |
| 780 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 781 | if (!trans) { |
| 782 | path->skip_locking = 1; |
| 783 | path->search_commit_root = 1; |
| 784 | } |
| 785 | again: |
| 786 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, |
| 787 | &key, path, 0, 0); |
| 788 | if (ret < 0) |
| 789 | goto out_free; |
| 790 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 791 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
Filipe David Borba Manana | 74be951 | 2013-07-05 23:12:06 +0100 | [diff] [blame] | 792 | metadata = 0; |
| 793 | if (path->slots[0]) { |
| 794 | path->slots[0]--; |
| 795 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 796 | path->slots[0]); |
| 797 | if (key.objectid == bytenr && |
| 798 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 799 | key.offset == root->leafsize) |
| 800 | ret = 0; |
| 801 | } |
| 802 | if (ret) { |
| 803 | key.objectid = bytenr; |
| 804 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 805 | key.offset = root->leafsize; |
| 806 | btrfs_release_path(path); |
| 807 | goto again; |
| 808 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 809 | } |
| 810 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 811 | if (ret == 0) { |
| 812 | leaf = path->nodes[0]; |
| 813 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 814 | if (item_size >= sizeof(*ei)) { |
| 815 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 816 | struct btrfs_extent_item); |
| 817 | num_refs = btrfs_extent_refs(leaf, ei); |
| 818 | extent_flags = btrfs_extent_flags(leaf, ei); |
| 819 | } else { |
| 820 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 821 | struct btrfs_extent_item_v0 *ei0; |
| 822 | BUG_ON(item_size != sizeof(*ei0)); |
| 823 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 824 | struct btrfs_extent_item_v0); |
| 825 | num_refs = btrfs_extent_refs_v0(leaf, ei0); |
| 826 | /* FIXME: this isn't correct for data */ |
| 827 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 828 | #else |
| 829 | BUG(); |
| 830 | #endif |
| 831 | } |
| 832 | BUG_ON(num_refs == 0); |
| 833 | } else { |
| 834 | num_refs = 0; |
| 835 | extent_flags = 0; |
| 836 | ret = 0; |
| 837 | } |
| 838 | |
| 839 | if (!trans) |
| 840 | goto out; |
| 841 | |
| 842 | delayed_refs = &trans->transaction->delayed_refs; |
| 843 | spin_lock(&delayed_refs->lock); |
| 844 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 845 | if (head) { |
| 846 | if (!mutex_trylock(&head->mutex)) { |
| 847 | atomic_inc(&head->node.refs); |
| 848 | spin_unlock(&delayed_refs->lock); |
| 849 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 850 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 851 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 852 | /* |
| 853 | * Mutex was contended, block until it's released and try |
| 854 | * again |
| 855 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 856 | mutex_lock(&head->mutex); |
| 857 | mutex_unlock(&head->mutex); |
| 858 | btrfs_put_delayed_ref(&head->node); |
| 859 | goto again; |
| 860 | } |
| 861 | if (head->extent_op && head->extent_op->update_flags) |
| 862 | extent_flags |= head->extent_op->flags_to_set; |
| 863 | else |
| 864 | BUG_ON(num_refs == 0); |
| 865 | |
| 866 | num_refs += head->node.ref_mod; |
| 867 | mutex_unlock(&head->mutex); |
| 868 | } |
| 869 | spin_unlock(&delayed_refs->lock); |
| 870 | out: |
| 871 | WARN_ON(num_refs == 0); |
| 872 | if (refs) |
| 873 | *refs = num_refs; |
| 874 | if (flags) |
| 875 | *flags = extent_flags; |
| 876 | out_free: |
| 877 | btrfs_free_path(path); |
| 878 | return ret; |
| 879 | } |
| 880 | |
| 881 | /* |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 882 | * Back reference rules. Back refs have three main goals: |
| 883 | * |
| 884 | * 1) differentiate between all holders of references to an extent so that |
| 885 | * when a reference is dropped we can make sure it was a valid reference |
| 886 | * before freeing the extent. |
| 887 | * |
| 888 | * 2) Provide enough information to quickly find the holders of an extent |
| 889 | * if we notice a given block is corrupted or bad. |
| 890 | * |
| 891 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 892 | * maintenance. This is actually the same as #2, but with a slightly |
| 893 | * different use case. |
| 894 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 895 | * There are two kinds of back refs. The implicit back refs is optimized |
| 896 | * for pointers in non-shared tree blocks. For a given pointer in a block, |
| 897 | * back refs of this kind provide information about the block's owner tree |
| 898 | * and the pointer's key. These information allow us to find the block by |
| 899 | * b-tree searching. The full back refs is for pointers in tree blocks not |
| 900 | * referenced by their owner trees. The location of tree block is recorded |
| 901 | * in the back refs. Actually the full back refs is generic, and can be |
| 902 | * used in all cases the implicit back refs is used. The major shortcoming |
| 903 | * of the full back refs is its overhead. Every time a tree block gets |
| 904 | * COWed, we have to update back refs entry for all pointers in it. |
| 905 | * |
| 906 | * For a newly allocated tree block, we use implicit back refs for |
| 907 | * pointers in it. This means most tree related operations only involve |
| 908 | * implicit back refs. For a tree block created in old transaction, the |
| 909 | * only way to drop a reference to it is COW it. So we can detect the |
| 910 | * event that tree block loses its owner tree's reference and do the |
| 911 | * back refs conversion. |
| 912 | * |
| 913 | * When a tree block is COW'd through a tree, there are four cases: |
| 914 | * |
| 915 | * The reference count of the block is one and the tree is the block's |
| 916 | * owner tree. Nothing to do in this case. |
| 917 | * |
| 918 | * The reference count of the block is one and the tree is not the |
| 919 | * block's owner tree. In this case, full back refs is used for pointers |
| 920 | * in the block. Remove these full back refs, add implicit back refs for |
| 921 | * every pointers in the new block. |
| 922 | * |
| 923 | * The reference count of the block is greater than one and the tree is |
| 924 | * the block's owner tree. In this case, implicit back refs is used for |
| 925 | * pointers in the block. Add full back refs for every pointers in the |
| 926 | * block, increase lower level extents' reference counts. The original |
| 927 | * implicit back refs are entailed to the new block. |
| 928 | * |
| 929 | * The reference count of the block is greater than one and the tree is |
| 930 | * not the block's owner tree. Add implicit back refs for every pointer in |
| 931 | * the new block, increase lower level extents' reference count. |
| 932 | * |
| 933 | * Back Reference Key composing: |
| 934 | * |
| 935 | * The key objectid corresponds to the first byte in the extent, |
| 936 | * The key type is used to differentiate between types of back refs. |
| 937 | * There are different meanings of the key offset for different types |
| 938 | * of back refs. |
| 939 | * |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 940 | * File extents can be referenced by: |
| 941 | * |
| 942 | * - multiple snapshots, subvolumes, or different generations in one subvol |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 943 | * - different files inside a single subvolume |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 944 | * - different offsets inside a file (bookend extents in file.c) |
| 945 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 946 | * The extent ref structure for the implicit back refs has fields for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 947 | * |
| 948 | * - Objectid of the subvolume root |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 949 | * - objectid of the file holding the reference |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 950 | * - original offset in the file |
| 951 | * - how many bookend extents |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 952 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 953 | * The key offset for the implicit back refs is hash of the first |
| 954 | * three fields. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 955 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 956 | * The extent ref structure for the full back refs has field for: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 957 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 958 | * - number of pointers in the tree leaf |
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 key offset for the implicit back refs is the first byte of |
| 961 | * the tree leaf |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 962 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 963 | * When a file extent is allocated, The implicit back refs is used. |
| 964 | * the fields are filled in: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 965 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 966 | * (root_key.objectid, inode objectid, offset in file, 1) |
| 967 | * |
| 968 | * When a file extent is removed file truncation, we find the |
| 969 | * corresponding implicit back refs and check the following fields: |
| 970 | * |
| 971 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 972 | * |
| 973 | * Btree extents can be referenced by: |
| 974 | * |
| 975 | * - Different subvolumes |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 976 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 977 | * Both the implicit back refs and the full back refs for tree blocks |
| 978 | * only consist of key. The key offset for the implicit back refs is |
| 979 | * objectid of block's owner tree. The key offset for the full back refs |
| 980 | * is the first byte of parent block. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 981 | * |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 982 | * When implicit back refs is used, information about the lowest key and |
| 983 | * level of the tree block are required. These information are stored in |
| 984 | * tree block info structure. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 985 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 986 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 987 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 988 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, |
| 989 | struct btrfs_root *root, |
| 990 | struct btrfs_path *path, |
| 991 | u64 owner, u32 extra_size) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 992 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 993 | struct btrfs_extent_item *item; |
| 994 | struct btrfs_extent_item_v0 *ei0; |
| 995 | struct btrfs_extent_ref_v0 *ref0; |
| 996 | struct btrfs_tree_block_info *bi; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 997 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 998 | struct btrfs_key key; |
| 999 | struct btrfs_key found_key; |
| 1000 | u32 new_size = sizeof(*item); |
| 1001 | u64 refs; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1002 | int ret; |
| 1003 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1004 | leaf = path->nodes[0]; |
| 1005 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1006 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1007 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1008 | ei0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1009 | struct btrfs_extent_item_v0); |
| 1010 | refs = btrfs_extent_refs_v0(leaf, ei0); |
| 1011 | |
| 1012 | if (owner == (u64)-1) { |
| 1013 | while (1) { |
| 1014 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1015 | ret = btrfs_next_leaf(root, path); |
| 1016 | if (ret < 0) |
| 1017 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1018 | BUG_ON(ret > 0); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1019 | leaf = path->nodes[0]; |
| 1020 | } |
| 1021 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 1022 | path->slots[0]); |
| 1023 | BUG_ON(key.objectid != found_key.objectid); |
| 1024 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { |
| 1025 | path->slots[0]++; |
| 1026 | continue; |
| 1027 | } |
| 1028 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1029 | struct btrfs_extent_ref_v0); |
| 1030 | owner = btrfs_ref_objectid_v0(leaf, ref0); |
| 1031 | break; |
| 1032 | } |
| 1033 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1034 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1035 | |
| 1036 | if (owner < BTRFS_FIRST_FREE_OBJECTID) |
| 1037 | new_size += sizeof(*bi); |
| 1038 | |
| 1039 | new_size -= sizeof(*ei0); |
| 1040 | ret = btrfs_search_slot(trans, root, &key, path, |
| 1041 | new_size + extra_size, 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1042 | if (ret < 0) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1043 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1044 | BUG_ON(ret); /* Corruption */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1045 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1046 | btrfs_extend_item(root, path, new_size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1047 | |
| 1048 | leaf = path->nodes[0]; |
| 1049 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1050 | btrfs_set_extent_refs(leaf, item, refs); |
| 1051 | /* FIXME: get real generation */ |
| 1052 | btrfs_set_extent_generation(leaf, item, 0); |
| 1053 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1054 | btrfs_set_extent_flags(leaf, item, |
| 1055 | BTRFS_EXTENT_FLAG_TREE_BLOCK | |
| 1056 | BTRFS_BLOCK_FLAG_FULL_BACKREF); |
| 1057 | bi = (struct btrfs_tree_block_info *)(item + 1); |
| 1058 | /* FIXME: get first key of the block */ |
| 1059 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); |
| 1060 | btrfs_set_tree_block_level(leaf, bi, (int)owner); |
| 1061 | } else { |
| 1062 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); |
| 1063 | } |
| 1064 | btrfs_mark_buffer_dirty(leaf); |
| 1065 | return 0; |
| 1066 | } |
| 1067 | #endif |
| 1068 | |
| 1069 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) |
| 1070 | { |
| 1071 | u32 high_crc = ~(u32)0; |
| 1072 | u32 low_crc = ~(u32)0; |
| 1073 | __le64 lenum; |
| 1074 | |
| 1075 | lenum = cpu_to_le64(root_objectid); |
David Woodhouse | 163e783 | 2009-04-19 13:02:41 +0100 | [diff] [blame] | 1076 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1077 | lenum = cpu_to_le64(owner); |
David Woodhouse | 163e783 | 2009-04-19 13:02:41 +0100 | [diff] [blame] | 1078 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1079 | lenum = cpu_to_le64(offset); |
David Woodhouse | 163e783 | 2009-04-19 13:02:41 +0100 | [diff] [blame] | 1080 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1081 | |
| 1082 | return ((u64)high_crc << 31) ^ (u64)low_crc; |
| 1083 | } |
| 1084 | |
| 1085 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, |
| 1086 | struct btrfs_extent_data_ref *ref) |
| 1087 | { |
| 1088 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), |
| 1089 | btrfs_extent_data_ref_objectid(leaf, ref), |
| 1090 | btrfs_extent_data_ref_offset(leaf, ref)); |
| 1091 | } |
| 1092 | |
| 1093 | static int match_extent_data_ref(struct extent_buffer *leaf, |
| 1094 | struct btrfs_extent_data_ref *ref, |
| 1095 | u64 root_objectid, u64 owner, u64 offset) |
| 1096 | { |
| 1097 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || |
| 1098 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || |
| 1099 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 1100 | return 0; |
| 1101 | return 1; |
| 1102 | } |
| 1103 | |
| 1104 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1105 | struct btrfs_root *root, |
| 1106 | struct btrfs_path *path, |
| 1107 | u64 bytenr, u64 parent, |
| 1108 | u64 root_objectid, |
| 1109 | u64 owner, u64 offset) |
| 1110 | { |
| 1111 | struct btrfs_key key; |
| 1112 | struct btrfs_extent_data_ref *ref; |
| 1113 | struct extent_buffer *leaf; |
| 1114 | u32 nritems; |
| 1115 | int ret; |
| 1116 | int recow; |
| 1117 | int err = -ENOENT; |
| 1118 | |
| 1119 | key.objectid = bytenr; |
| 1120 | if (parent) { |
| 1121 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1122 | key.offset = parent; |
| 1123 | } else { |
| 1124 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1125 | key.offset = hash_extent_data_ref(root_objectid, |
| 1126 | owner, offset); |
| 1127 | } |
| 1128 | again: |
| 1129 | recow = 0; |
| 1130 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1131 | if (ret < 0) { |
| 1132 | err = ret; |
| 1133 | goto fail; |
| 1134 | } |
| 1135 | |
| 1136 | if (parent) { |
| 1137 | if (!ret) |
| 1138 | return 0; |
| 1139 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1140 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1141 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1142 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1143 | if (ret < 0) { |
| 1144 | err = ret; |
| 1145 | goto fail; |
| 1146 | } |
| 1147 | if (!ret) |
| 1148 | return 0; |
| 1149 | #endif |
| 1150 | goto fail; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1154 | nritems = btrfs_header_nritems(leaf); |
| 1155 | while (1) { |
| 1156 | if (path->slots[0] >= nritems) { |
| 1157 | ret = btrfs_next_leaf(root, path); |
| 1158 | if (ret < 0) |
| 1159 | err = ret; |
| 1160 | if (ret) |
| 1161 | goto fail; |
| 1162 | |
| 1163 | leaf = path->nodes[0]; |
| 1164 | nritems = btrfs_header_nritems(leaf); |
| 1165 | recow = 1; |
| 1166 | } |
| 1167 | |
| 1168 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1169 | if (key.objectid != bytenr || |
| 1170 | key.type != BTRFS_EXTENT_DATA_REF_KEY) |
| 1171 | goto fail; |
| 1172 | |
| 1173 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1174 | struct btrfs_extent_data_ref); |
| 1175 | |
| 1176 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1177 | owner, offset)) { |
| 1178 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1179 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1180 | goto again; |
| 1181 | } |
| 1182 | err = 0; |
| 1183 | break; |
| 1184 | } |
| 1185 | path->slots[0]++; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1186 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1187 | fail: |
| 1188 | return err; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1189 | } |
| 1190 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1191 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1192 | struct btrfs_root *root, |
| 1193 | struct btrfs_path *path, |
| 1194 | u64 bytenr, u64 parent, |
| 1195 | u64 root_objectid, u64 owner, |
| 1196 | u64 offset, int refs_to_add) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1197 | { |
| 1198 | struct btrfs_key key; |
| 1199 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1200 | u32 size; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1201 | u32 num_refs; |
| 1202 | int ret; |
| 1203 | |
| 1204 | key.objectid = bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1205 | if (parent) { |
| 1206 | key.type = BTRFS_SHARED_DATA_REF_KEY; |
| 1207 | key.offset = parent; |
| 1208 | size = sizeof(struct btrfs_shared_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1209 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1210 | key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1211 | key.offset = hash_extent_data_ref(root_objectid, |
| 1212 | owner, offset); |
| 1213 | size = sizeof(struct btrfs_extent_data_ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1214 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1215 | |
| 1216 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
| 1217 | if (ret && ret != -EEXIST) |
| 1218 | goto fail; |
| 1219 | |
| 1220 | leaf = path->nodes[0]; |
| 1221 | if (parent) { |
| 1222 | struct btrfs_shared_data_ref *ref; |
| 1223 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1224 | struct btrfs_shared_data_ref); |
| 1225 | if (ret == 0) { |
| 1226 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); |
| 1227 | } else { |
| 1228 | num_refs = btrfs_shared_data_ref_count(leaf, ref); |
| 1229 | num_refs += refs_to_add; |
| 1230 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); |
| 1231 | } |
| 1232 | } else { |
| 1233 | struct btrfs_extent_data_ref *ref; |
| 1234 | while (ret == -EEXIST) { |
| 1235 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1236 | struct btrfs_extent_data_ref); |
| 1237 | if (match_extent_data_ref(leaf, ref, root_objectid, |
| 1238 | owner, offset)) |
| 1239 | break; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1240 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1241 | key.offset++; |
| 1242 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 1243 | size); |
| 1244 | if (ret && ret != -EEXIST) |
| 1245 | goto fail; |
| 1246 | |
| 1247 | leaf = path->nodes[0]; |
| 1248 | } |
| 1249 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 1250 | struct btrfs_extent_data_ref); |
| 1251 | if (ret == 0) { |
| 1252 | btrfs_set_extent_data_ref_root(leaf, ref, |
| 1253 | root_objectid); |
| 1254 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 1255 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 1256 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); |
| 1257 | } else { |
| 1258 | num_refs = btrfs_extent_data_ref_count(leaf, ref); |
| 1259 | num_refs += refs_to_add; |
| 1260 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); |
| 1261 | } |
| 1262 | } |
| 1263 | btrfs_mark_buffer_dirty(leaf); |
| 1264 | ret = 0; |
| 1265 | fail: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1266 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1267 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1268 | } |
| 1269 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1270 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
| 1271 | struct btrfs_root *root, |
| 1272 | struct btrfs_path *path, |
| 1273 | int refs_to_drop) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1274 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1275 | struct btrfs_key key; |
| 1276 | struct btrfs_extent_data_ref *ref1 = NULL; |
| 1277 | struct btrfs_shared_data_ref *ref2 = NULL; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1278 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1279 | u32 num_refs = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1280 | int ret = 0; |
| 1281 | |
| 1282 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1283 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1284 | |
| 1285 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1286 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1287 | struct btrfs_extent_data_ref); |
| 1288 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1289 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1290 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1291 | struct btrfs_shared_data_ref); |
| 1292 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1293 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1294 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1295 | struct btrfs_extent_ref_v0 *ref0; |
| 1296 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1297 | struct btrfs_extent_ref_v0); |
| 1298 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1299 | #endif |
| 1300 | } else { |
| 1301 | BUG(); |
| 1302 | } |
| 1303 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1304 | BUG_ON(num_refs < refs_to_drop); |
| 1305 | num_refs -= refs_to_drop; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1306 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1307 | if (num_refs == 0) { |
| 1308 | ret = btrfs_del_item(trans, root, path); |
| 1309 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1310 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1311 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); |
| 1312 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) |
| 1313 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); |
| 1314 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1315 | else { |
| 1316 | struct btrfs_extent_ref_v0 *ref0; |
| 1317 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1318 | struct btrfs_extent_ref_v0); |
| 1319 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); |
| 1320 | } |
| 1321 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1322 | btrfs_mark_buffer_dirty(leaf); |
| 1323 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1324 | return ret; |
| 1325 | } |
| 1326 | |
| 1327 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
| 1328 | struct btrfs_path *path, |
| 1329 | struct btrfs_extent_inline_ref *iref) |
| 1330 | { |
| 1331 | struct btrfs_key key; |
| 1332 | struct extent_buffer *leaf; |
| 1333 | struct btrfs_extent_data_ref *ref1; |
| 1334 | struct btrfs_shared_data_ref *ref2; |
| 1335 | u32 num_refs = 0; |
| 1336 | |
| 1337 | leaf = path->nodes[0]; |
| 1338 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1339 | if (iref) { |
| 1340 | if (btrfs_extent_inline_ref_type(leaf, iref) == |
| 1341 | BTRFS_EXTENT_DATA_REF_KEY) { |
| 1342 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1343 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1344 | } else { |
| 1345 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1346 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1347 | } |
| 1348 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1349 | ref1 = btrfs_item_ptr(leaf, path->slots[0], |
| 1350 | struct btrfs_extent_data_ref); |
| 1351 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); |
| 1352 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1353 | ref2 = btrfs_item_ptr(leaf, path->slots[0], |
| 1354 | struct btrfs_shared_data_ref); |
| 1355 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); |
| 1356 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1357 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 1358 | struct btrfs_extent_ref_v0 *ref0; |
| 1359 | ref0 = btrfs_item_ptr(leaf, path->slots[0], |
| 1360 | struct btrfs_extent_ref_v0); |
| 1361 | num_refs = btrfs_ref_count_v0(leaf, ref0); |
| 1362 | #endif |
| 1363 | } else { |
| 1364 | WARN_ON(1); |
| 1365 | } |
| 1366 | return num_refs; |
| 1367 | } |
| 1368 | |
| 1369 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1370 | struct btrfs_root *root, |
| 1371 | struct btrfs_path *path, |
| 1372 | u64 bytenr, u64 parent, |
| 1373 | u64 root_objectid) |
| 1374 | { |
| 1375 | struct btrfs_key key; |
| 1376 | int ret; |
| 1377 | |
| 1378 | key.objectid = bytenr; |
| 1379 | if (parent) { |
| 1380 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1381 | key.offset = parent; |
| 1382 | } else { |
| 1383 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1384 | key.offset = root_objectid; |
| 1385 | } |
| 1386 | |
| 1387 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1388 | if (ret > 0) |
| 1389 | ret = -ENOENT; |
| 1390 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1391 | if (ret == -ENOENT && parent) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1392 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1393 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
| 1394 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1395 | if (ret > 0) |
| 1396 | ret = -ENOENT; |
| 1397 | } |
| 1398 | #endif |
| 1399 | return ret; |
| 1400 | } |
| 1401 | |
| 1402 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
| 1403 | struct btrfs_root *root, |
| 1404 | struct btrfs_path *path, |
| 1405 | u64 bytenr, u64 parent, |
| 1406 | u64 root_objectid) |
| 1407 | { |
| 1408 | struct btrfs_key key; |
| 1409 | int ret; |
| 1410 | |
| 1411 | key.objectid = bytenr; |
| 1412 | if (parent) { |
| 1413 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1414 | key.offset = parent; |
| 1415 | } else { |
| 1416 | key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1417 | key.offset = root_objectid; |
| 1418 | } |
| 1419 | |
| 1420 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1421 | btrfs_release_path(path); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1422 | return ret; |
| 1423 | } |
| 1424 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1425 | static inline int extent_ref_type(u64 parent, u64 owner) |
| 1426 | { |
| 1427 | int type; |
| 1428 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1429 | if (parent > 0) |
| 1430 | type = BTRFS_SHARED_BLOCK_REF_KEY; |
| 1431 | else |
| 1432 | type = BTRFS_TREE_BLOCK_REF_KEY; |
| 1433 | } else { |
| 1434 | if (parent > 0) |
| 1435 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 1436 | else |
| 1437 | type = BTRFS_EXTENT_DATA_REF_KEY; |
| 1438 | } |
| 1439 | return type; |
| 1440 | } |
| 1441 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1442 | static int find_next_key(struct btrfs_path *path, int level, |
| 1443 | struct btrfs_key *key) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1444 | |
| 1445 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1446 | for (; level < BTRFS_MAX_LEVEL; level++) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1447 | if (!path->nodes[level]) |
| 1448 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1449 | if (path->slots[level] + 1 >= |
| 1450 | btrfs_header_nritems(path->nodes[level])) |
| 1451 | continue; |
| 1452 | if (level == 0) |
| 1453 | btrfs_item_key_to_cpu(path->nodes[level], key, |
| 1454 | path->slots[level] + 1); |
| 1455 | else |
| 1456 | btrfs_node_key_to_cpu(path->nodes[level], key, |
| 1457 | path->slots[level] + 1); |
| 1458 | return 0; |
| 1459 | } |
| 1460 | return 1; |
| 1461 | } |
| 1462 | |
| 1463 | /* |
| 1464 | * look for inline back ref. if back ref is found, *ref_ret is set |
| 1465 | * to the address of inline back ref, and 0 is returned. |
| 1466 | * |
| 1467 | * if back ref isn't found, *ref_ret is set to the address where it |
| 1468 | * should be inserted, and -ENOENT is returned. |
| 1469 | * |
| 1470 | * if insert is true and there are too many inline back refs, the path |
| 1471 | * points to the extent item, and -EAGAIN is returned. |
| 1472 | * |
| 1473 | * NOTE: inline back refs are ordered in the same way that back ref |
| 1474 | * items in the tree are ordered. |
| 1475 | */ |
| 1476 | static noinline_for_stack |
| 1477 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1478 | struct btrfs_root *root, |
| 1479 | struct btrfs_path *path, |
| 1480 | struct btrfs_extent_inline_ref **ref_ret, |
| 1481 | u64 bytenr, u64 num_bytes, |
| 1482 | u64 parent, u64 root_objectid, |
| 1483 | u64 owner, u64 offset, int insert) |
| 1484 | { |
| 1485 | struct btrfs_key key; |
| 1486 | struct extent_buffer *leaf; |
| 1487 | struct btrfs_extent_item *ei; |
| 1488 | struct btrfs_extent_inline_ref *iref; |
| 1489 | u64 flags; |
| 1490 | u64 item_size; |
| 1491 | unsigned long ptr; |
| 1492 | unsigned long end; |
| 1493 | int extra_size; |
| 1494 | int type; |
| 1495 | int want; |
| 1496 | int ret; |
| 1497 | int err = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1498 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 1499 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1500 | |
| 1501 | key.objectid = bytenr; |
| 1502 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1503 | key.offset = num_bytes; |
| 1504 | |
| 1505 | want = extent_ref_type(parent, owner); |
| 1506 | if (insert) { |
| 1507 | extra_size = btrfs_extent_inline_ref_size(want); |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1508 | path->keep_locks = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1509 | } else |
| 1510 | extra_size = -1; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1511 | |
| 1512 | /* |
| 1513 | * Owner is our parent level, so we can just add one to get the level |
| 1514 | * for the block we are interested in. |
| 1515 | */ |
| 1516 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1517 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 1518 | key.offset = owner; |
| 1519 | } |
| 1520 | |
| 1521 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1522 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
| 1523 | if (ret < 0) { |
| 1524 | err = ret; |
| 1525 | goto out; |
| 1526 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1527 | |
| 1528 | /* |
| 1529 | * We may be a newly converted file system which still has the old fat |
| 1530 | * extent entries for metadata, so try and see if we have one of those. |
| 1531 | */ |
| 1532 | if (ret > 0 && skinny_metadata) { |
| 1533 | skinny_metadata = false; |
| 1534 | if (path->slots[0]) { |
| 1535 | path->slots[0]--; |
| 1536 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 1537 | path->slots[0]); |
| 1538 | if (key.objectid == bytenr && |
| 1539 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 1540 | key.offset == num_bytes) |
| 1541 | ret = 0; |
| 1542 | } |
| 1543 | if (ret) { |
| 1544 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1545 | key.offset = num_bytes; |
| 1546 | btrfs_release_path(path); |
| 1547 | goto again; |
| 1548 | } |
| 1549 | } |
| 1550 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1551 | if (ret && !insert) { |
| 1552 | err = -ENOENT; |
| 1553 | goto out; |
Josef Bacik | 492104c | 2013-03-08 15:41:02 -0500 | [diff] [blame] | 1554 | } else if (ret) { |
| 1555 | err = -EIO; |
| 1556 | WARN_ON(1); |
| 1557 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1558 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1559 | |
| 1560 | leaf = path->nodes[0]; |
| 1561 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1562 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 1563 | if (item_size < sizeof(*ei)) { |
| 1564 | if (!insert) { |
| 1565 | err = -ENOENT; |
| 1566 | goto out; |
| 1567 | } |
| 1568 | ret = convert_extent_item_v0(trans, root, path, owner, |
| 1569 | extra_size); |
| 1570 | if (ret < 0) { |
| 1571 | err = ret; |
| 1572 | goto out; |
| 1573 | } |
| 1574 | leaf = path->nodes[0]; |
| 1575 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1576 | } |
| 1577 | #endif |
| 1578 | BUG_ON(item_size < sizeof(*ei)); |
| 1579 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1580 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1581 | flags = btrfs_extent_flags(leaf, ei); |
| 1582 | |
| 1583 | ptr = (unsigned long)(ei + 1); |
| 1584 | end = (unsigned long)ei + item_size; |
| 1585 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 1586 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1587 | ptr += sizeof(struct btrfs_tree_block_info); |
| 1588 | BUG_ON(ptr > end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1589 | } |
| 1590 | |
| 1591 | err = -ENOENT; |
| 1592 | while (1) { |
| 1593 | if (ptr >= end) { |
| 1594 | WARN_ON(ptr > end); |
| 1595 | break; |
| 1596 | } |
| 1597 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1598 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1599 | if (want < type) |
| 1600 | break; |
| 1601 | if (want > type) { |
| 1602 | ptr += btrfs_extent_inline_ref_size(type); |
| 1603 | continue; |
| 1604 | } |
| 1605 | |
| 1606 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1607 | struct btrfs_extent_data_ref *dref; |
| 1608 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1609 | if (match_extent_data_ref(leaf, dref, root_objectid, |
| 1610 | owner, offset)) { |
| 1611 | err = 0; |
| 1612 | break; |
| 1613 | } |
| 1614 | if (hash_extent_data_ref_item(leaf, dref) < |
| 1615 | hash_extent_data_ref(root_objectid, owner, offset)) |
| 1616 | break; |
| 1617 | } else { |
| 1618 | u64 ref_offset; |
| 1619 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); |
| 1620 | if (parent > 0) { |
| 1621 | if (parent == ref_offset) { |
| 1622 | err = 0; |
| 1623 | break; |
| 1624 | } |
| 1625 | if (ref_offset < parent) |
| 1626 | break; |
| 1627 | } else { |
| 1628 | if (root_objectid == ref_offset) { |
| 1629 | err = 0; |
| 1630 | break; |
| 1631 | } |
| 1632 | if (ref_offset < root_objectid) |
| 1633 | break; |
| 1634 | } |
| 1635 | } |
| 1636 | ptr += btrfs_extent_inline_ref_size(type); |
| 1637 | } |
| 1638 | if (err == -ENOENT && insert) { |
| 1639 | if (item_size + extra_size >= |
| 1640 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { |
| 1641 | err = -EAGAIN; |
| 1642 | goto out; |
| 1643 | } |
| 1644 | /* |
| 1645 | * To add new inline back ref, we have to make sure |
| 1646 | * there is no corresponding back ref item. |
| 1647 | * For simplicity, we just do not add new inline back |
| 1648 | * ref if there is any kind of item for this block |
| 1649 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 1650 | if (find_next_key(path, 0, &key) == 0 && |
| 1651 | key.objectid == bytenr && |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1652 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1653 | err = -EAGAIN; |
| 1654 | goto out; |
| 1655 | } |
| 1656 | } |
| 1657 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; |
| 1658 | out: |
Yan Zheng | 85d4198 | 2009-06-11 08:51:10 -0400 | [diff] [blame] | 1659 | if (insert) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1660 | path->keep_locks = 0; |
| 1661 | btrfs_unlock_up_safe(path, 1); |
| 1662 | } |
| 1663 | return err; |
| 1664 | } |
| 1665 | |
| 1666 | /* |
| 1667 | * helper to add new inline back ref |
| 1668 | */ |
| 1669 | static noinline_for_stack |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1670 | void setup_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1671 | struct btrfs_path *path, |
| 1672 | struct btrfs_extent_inline_ref *iref, |
| 1673 | u64 parent, u64 root_objectid, |
| 1674 | u64 owner, u64 offset, int refs_to_add, |
| 1675 | struct btrfs_delayed_extent_op *extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1676 | { |
| 1677 | struct extent_buffer *leaf; |
| 1678 | struct btrfs_extent_item *ei; |
| 1679 | unsigned long ptr; |
| 1680 | unsigned long end; |
| 1681 | unsigned long item_offset; |
| 1682 | u64 refs; |
| 1683 | int size; |
| 1684 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1685 | |
| 1686 | leaf = path->nodes[0]; |
| 1687 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1688 | item_offset = (unsigned long)iref - (unsigned long)ei; |
| 1689 | |
| 1690 | type = extent_ref_type(parent, owner); |
| 1691 | size = btrfs_extent_inline_ref_size(type); |
| 1692 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 1693 | btrfs_extend_item(root, path, size); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1694 | |
| 1695 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1696 | refs = btrfs_extent_refs(leaf, ei); |
| 1697 | refs += refs_to_add; |
| 1698 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1699 | if (extent_op) |
| 1700 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1701 | |
| 1702 | ptr = (unsigned long)ei + item_offset; |
| 1703 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); |
| 1704 | if (ptr < end - size) |
| 1705 | memmove_extent_buffer(leaf, ptr + size, ptr, |
| 1706 | end - size - ptr); |
| 1707 | |
| 1708 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 1709 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 1710 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1711 | struct btrfs_extent_data_ref *dref; |
| 1712 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1713 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); |
| 1714 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); |
| 1715 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); |
| 1716 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); |
| 1717 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1718 | struct btrfs_shared_data_ref *sref; |
| 1719 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1720 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); |
| 1721 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1722 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| 1723 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 1724 | } else { |
| 1725 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 1726 | } |
| 1727 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1728 | } |
| 1729 | |
| 1730 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, |
| 1731 | struct btrfs_root *root, |
| 1732 | struct btrfs_path *path, |
| 1733 | struct btrfs_extent_inline_ref **ref_ret, |
| 1734 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1735 | u64 root_objectid, u64 owner, u64 offset) |
| 1736 | { |
| 1737 | int ret; |
| 1738 | |
| 1739 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, |
| 1740 | bytenr, num_bytes, parent, |
| 1741 | root_objectid, owner, offset, 0); |
| 1742 | if (ret != -ENOENT) |
| 1743 | return ret; |
| 1744 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1745 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1746 | *ref_ret = NULL; |
| 1747 | |
| 1748 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1749 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, |
| 1750 | root_objectid); |
| 1751 | } else { |
| 1752 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, |
| 1753 | root_objectid, owner, offset); |
| 1754 | } |
| 1755 | return ret; |
| 1756 | } |
| 1757 | |
| 1758 | /* |
| 1759 | * helper to update/remove inline back ref |
| 1760 | */ |
| 1761 | static noinline_for_stack |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1762 | void update_inline_extent_backref(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1763 | struct btrfs_path *path, |
| 1764 | struct btrfs_extent_inline_ref *iref, |
| 1765 | int refs_to_mod, |
| 1766 | struct btrfs_delayed_extent_op *extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1767 | { |
| 1768 | struct extent_buffer *leaf; |
| 1769 | struct btrfs_extent_item *ei; |
| 1770 | struct btrfs_extent_data_ref *dref = NULL; |
| 1771 | struct btrfs_shared_data_ref *sref = NULL; |
| 1772 | unsigned long ptr; |
| 1773 | unsigned long end; |
| 1774 | u32 item_size; |
| 1775 | int size; |
| 1776 | int type; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1777 | u64 refs; |
| 1778 | |
| 1779 | leaf = path->nodes[0]; |
| 1780 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 1781 | refs = btrfs_extent_refs(leaf, ei); |
| 1782 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); |
| 1783 | refs += refs_to_mod; |
| 1784 | btrfs_set_extent_refs(leaf, ei, refs); |
| 1785 | if (extent_op) |
| 1786 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 1787 | |
| 1788 | type = btrfs_extent_inline_ref_type(leaf, iref); |
| 1789 | |
| 1790 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 1791 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 1792 | refs = btrfs_extent_data_ref_count(leaf, dref); |
| 1793 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1794 | sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 1795 | refs = btrfs_shared_data_ref_count(leaf, sref); |
| 1796 | } else { |
| 1797 | refs = 1; |
| 1798 | BUG_ON(refs_to_mod != -1); |
| 1799 | } |
| 1800 | |
| 1801 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
| 1802 | refs += refs_to_mod; |
| 1803 | |
| 1804 | if (refs > 0) { |
| 1805 | if (type == BTRFS_EXTENT_DATA_REF_KEY) |
| 1806 | btrfs_set_extent_data_ref_count(leaf, dref, refs); |
| 1807 | else |
| 1808 | btrfs_set_shared_data_ref_count(leaf, sref, refs); |
| 1809 | } else { |
| 1810 | size = btrfs_extent_inline_ref_size(type); |
| 1811 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1812 | ptr = (unsigned long)iref; |
| 1813 | end = (unsigned long)ei + item_size; |
| 1814 | if (ptr + size < end) |
| 1815 | memmove_extent_buffer(leaf, ptr, ptr + size, |
| 1816 | end - ptr - size); |
| 1817 | item_size -= size; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1818 | btrfs_truncate_item(root, path, item_size, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1819 | } |
| 1820 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1821 | } |
| 1822 | |
| 1823 | static noinline_for_stack |
| 1824 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, |
| 1825 | struct btrfs_root *root, |
| 1826 | struct btrfs_path *path, |
| 1827 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1828 | u64 root_objectid, u64 owner, |
| 1829 | u64 offset, int refs_to_add, |
| 1830 | struct btrfs_delayed_extent_op *extent_op) |
| 1831 | { |
| 1832 | struct btrfs_extent_inline_ref *iref; |
| 1833 | int ret; |
| 1834 | |
| 1835 | ret = lookup_inline_extent_backref(trans, root, path, &iref, |
| 1836 | bytenr, num_bytes, parent, |
| 1837 | root_objectid, owner, offset, 1); |
| 1838 | if (ret == 0) { |
| 1839 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1840 | update_inline_extent_backref(root, path, iref, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1841 | refs_to_add, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1842 | } else if (ret == -ENOENT) { |
Tsutomu Itoh | fd279fa | 2013-04-16 05:19:11 +0000 | [diff] [blame] | 1843 | setup_inline_extent_backref(root, path, iref, parent, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1844 | root_objectid, owner, offset, |
| 1845 | refs_to_add, extent_op); |
| 1846 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1847 | } |
| 1848 | return ret; |
| 1849 | } |
| 1850 | |
| 1851 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
| 1852 | struct btrfs_root *root, |
| 1853 | struct btrfs_path *path, |
| 1854 | u64 bytenr, u64 parent, u64 root_objectid, |
| 1855 | u64 owner, u64 offset, int refs_to_add) |
| 1856 | { |
| 1857 | int ret; |
| 1858 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 1859 | BUG_ON(refs_to_add != 1); |
| 1860 | ret = insert_tree_block_ref(trans, root, path, bytenr, |
| 1861 | parent, root_objectid); |
| 1862 | } else { |
| 1863 | ret = insert_extent_data_ref(trans, root, path, bytenr, |
| 1864 | parent, root_objectid, |
| 1865 | owner, offset, refs_to_add); |
| 1866 | } |
| 1867 | return ret; |
| 1868 | } |
| 1869 | |
| 1870 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
| 1871 | struct btrfs_root *root, |
| 1872 | struct btrfs_path *path, |
| 1873 | struct btrfs_extent_inline_ref *iref, |
| 1874 | int refs_to_drop, int is_data) |
| 1875 | { |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1876 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1877 | |
| 1878 | BUG_ON(!is_data && refs_to_drop != 1); |
| 1879 | if (iref) { |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1880 | update_inline_extent_backref(root, path, iref, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1881 | -refs_to_drop, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1882 | } else if (is_data) { |
| 1883 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); |
| 1884 | } else { |
| 1885 | ret = btrfs_del_item(trans, root, path); |
| 1886 | } |
| 1887 | return ret; |
| 1888 | } |
| 1889 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1890 | static int btrfs_issue_discard(struct block_device *bdev, |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1891 | u64 start, u64 len) |
| 1892 | { |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1893 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1894 | } |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1895 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1896 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1897 | u64 num_bytes, u64 *actual_bytes) |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1898 | { |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1899 | int ret; |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1900 | u64 discarded_bytes = 0; |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1901 | struct btrfs_bio *bbio = NULL; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1902 | |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 1903 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1904 | /* Tell the block device(s) that the sectors can be discarded */ |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 1905 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1906 | bytenr, &num_bytes, &bbio, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1907 | /* Error condition is -ENOMEM */ |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1908 | if (!ret) { |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1909 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1910 | int i; |
| 1911 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1912 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1913 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
Josef Bacik | d5e2003 | 2011-08-04 14:52:27 +0000 | [diff] [blame] | 1914 | if (!stripe->dev->can_discard) |
| 1915 | continue; |
| 1916 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1917 | ret = btrfs_issue_discard(stripe->dev->bdev, |
| 1918 | stripe->physical, |
| 1919 | stripe->length); |
| 1920 | if (!ret) |
| 1921 | discarded_bytes += stripe->length; |
| 1922 | else if (ret != -EOPNOTSUPP) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1923 | 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] | 1924 | |
| 1925 | /* |
| 1926 | * Just in case we get back EOPNOTSUPP for some reason, |
| 1927 | * just ignore the return value so we don't screw up |
| 1928 | * people calling discard_extent. |
| 1929 | */ |
| 1930 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1931 | } |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 1932 | kfree(bbio); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1933 | } |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 1934 | |
| 1935 | if (actual_bytes) |
| 1936 | *actual_bytes = discarded_bytes; |
| 1937 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1938 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1939 | if (ret == -EOPNOTSUPP) |
| 1940 | ret = 0; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1941 | return ret; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 1942 | } |
| 1943 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1944 | /* Can return -ENOMEM */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1945 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
| 1946 | struct btrfs_root *root, |
| 1947 | u64 bytenr, u64 num_bytes, u64 parent, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1948 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1949 | { |
| 1950 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1951 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1952 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1953 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
| 1954 | root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1955 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1956 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1957 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 1958 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1959 | parent, root_objectid, (int)owner, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1960 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1961 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1962 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 1963 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1964 | parent, root_objectid, owner, offset, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1965 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1966 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1967 | return ret; |
| 1968 | } |
| 1969 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1970 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1971 | struct btrfs_root *root, |
| 1972 | u64 bytenr, u64 num_bytes, |
| 1973 | u64 parent, u64 root_objectid, |
| 1974 | u64 owner, u64 offset, int refs_to_add, |
| 1975 | struct btrfs_delayed_extent_op *extent_op) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1976 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1977 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1978 | struct extent_buffer *leaf; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1979 | struct btrfs_extent_item *item; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1980 | u64 refs; |
| 1981 | int ret; |
| 1982 | int err = 0; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1983 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1984 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1985 | if (!path) |
| 1986 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1987 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1988 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1989 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1990 | /* this will setup the path even if it fails to insert the back ref */ |
| 1991 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, |
| 1992 | path, bytenr, num_bytes, parent, |
| 1993 | root_objectid, owner, offset, |
| 1994 | refs_to_add, extent_op); |
| 1995 | if (ret == 0) |
| 1996 | goto out; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1997 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1998 | if (ret != -EAGAIN) { |
| 1999 | err = ret; |
| 2000 | goto out; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2001 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2002 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2003 | leaf = path->nodes[0]; |
| 2004 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2005 | refs = btrfs_extent_refs(leaf, item); |
| 2006 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); |
| 2007 | if (extent_op) |
| 2008 | __run_delayed_extent_op(extent_op, leaf, item); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2009 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2010 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2011 | btrfs_release_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2012 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2013 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2014 | path->leave_spinning = 1; |
| 2015 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2016 | /* now insert the actual backref */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2017 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2018 | path, bytenr, parent, root_objectid, |
| 2019 | owner, offset, refs_to_add); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2020 | if (ret) |
| 2021 | btrfs_abort_transaction(trans, root, ret); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2022 | out: |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2023 | btrfs_free_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2024 | return err; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 2025 | } |
| 2026 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2027 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
| 2028 | struct btrfs_root *root, |
| 2029 | struct btrfs_delayed_ref_node *node, |
| 2030 | struct btrfs_delayed_extent_op *extent_op, |
| 2031 | int insert_reserved) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2032 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2033 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2034 | struct btrfs_delayed_data_ref *ref; |
| 2035 | struct btrfs_key ins; |
| 2036 | u64 parent = 0; |
| 2037 | u64 ref_root = 0; |
| 2038 | u64 flags = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2039 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2040 | ins.objectid = node->bytenr; |
| 2041 | ins.offset = node->num_bytes; |
| 2042 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2043 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2044 | ref = btrfs_delayed_node_to_data_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2045 | trace_run_delayed_data_ref(node, ref, node->action); |
| 2046 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2047 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2048 | parent = ref->parent; |
| 2049 | else |
| 2050 | ref_root = ref->root; |
| 2051 | |
| 2052 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2053 | if (extent_op) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2054 | flags |= extent_op->flags_to_set; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2055 | ret = alloc_reserved_file_extent(trans, root, |
| 2056 | parent, ref_root, flags, |
| 2057 | ref->objectid, ref->offset, |
| 2058 | &ins, node->ref_mod); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2059 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2060 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2061 | node->num_bytes, parent, |
| 2062 | ref_root, ref->objectid, |
| 2063 | ref->offset, node->ref_mod, |
| 2064 | extent_op); |
| 2065 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2066 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2067 | node->num_bytes, parent, |
| 2068 | ref_root, ref->objectid, |
| 2069 | ref->offset, node->ref_mod, |
| 2070 | extent_op); |
| 2071 | } else { |
| 2072 | BUG(); |
| 2073 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2074 | return ret; |
| 2075 | } |
| 2076 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2077 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
| 2078 | struct extent_buffer *leaf, |
| 2079 | struct btrfs_extent_item *ei) |
| 2080 | { |
| 2081 | u64 flags = btrfs_extent_flags(leaf, ei); |
| 2082 | if (extent_op->update_flags) { |
| 2083 | flags |= extent_op->flags_to_set; |
| 2084 | btrfs_set_extent_flags(leaf, ei, flags); |
| 2085 | } |
| 2086 | |
| 2087 | if (extent_op->update_key) { |
| 2088 | struct btrfs_tree_block_info *bi; |
| 2089 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); |
| 2090 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 2091 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); |
| 2092 | } |
| 2093 | } |
| 2094 | |
| 2095 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, |
| 2096 | struct btrfs_root *root, |
| 2097 | struct btrfs_delayed_ref_node *node, |
| 2098 | struct btrfs_delayed_extent_op *extent_op) |
| 2099 | { |
| 2100 | struct btrfs_key key; |
| 2101 | struct btrfs_path *path; |
| 2102 | struct btrfs_extent_item *ei; |
| 2103 | struct extent_buffer *leaf; |
| 2104 | u32 item_size; |
| 2105 | int ret; |
| 2106 | int err = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2107 | int metadata = !extent_op->is_data; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2108 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2109 | if (trans->aborted) |
| 2110 | return 0; |
| 2111 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2112 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2113 | metadata = 0; |
| 2114 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2115 | path = btrfs_alloc_path(); |
| 2116 | if (!path) |
| 2117 | return -ENOMEM; |
| 2118 | |
| 2119 | key.objectid = node->bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2120 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2121 | if (metadata) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2122 | key.type = BTRFS_METADATA_ITEM_KEY; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2123 | key.offset = extent_op->level; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2124 | } else { |
| 2125 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2126 | key.offset = node->num_bytes; |
| 2127 | } |
| 2128 | |
| 2129 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2130 | path->reada = 1; |
| 2131 | path->leave_spinning = 1; |
| 2132 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, |
| 2133 | path, 0, 1); |
| 2134 | if (ret < 0) { |
| 2135 | err = ret; |
| 2136 | goto out; |
| 2137 | } |
| 2138 | if (ret > 0) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2139 | if (metadata) { |
| 2140 | btrfs_release_path(path); |
| 2141 | metadata = 0; |
| 2142 | |
| 2143 | key.offset = node->num_bytes; |
| 2144 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2145 | goto again; |
| 2146 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2147 | err = -EIO; |
| 2148 | goto out; |
| 2149 | } |
| 2150 | |
| 2151 | leaf = path->nodes[0]; |
| 2152 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2153 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 2154 | if (item_size < sizeof(*ei)) { |
| 2155 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, |
| 2156 | path, (u64)-1, 0); |
| 2157 | if (ret < 0) { |
| 2158 | err = ret; |
| 2159 | goto out; |
| 2160 | } |
| 2161 | leaf = path->nodes[0]; |
| 2162 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2163 | } |
| 2164 | #endif |
| 2165 | BUG_ON(item_size < sizeof(*ei)); |
| 2166 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2167 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 2168 | |
| 2169 | btrfs_mark_buffer_dirty(leaf); |
| 2170 | out: |
| 2171 | btrfs_free_path(path); |
| 2172 | return err; |
| 2173 | } |
| 2174 | |
| 2175 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
| 2176 | struct btrfs_root *root, |
| 2177 | struct btrfs_delayed_ref_node *node, |
| 2178 | struct btrfs_delayed_extent_op *extent_op, |
| 2179 | int insert_reserved) |
| 2180 | { |
| 2181 | int ret = 0; |
| 2182 | struct btrfs_delayed_tree_ref *ref; |
| 2183 | struct btrfs_key ins; |
| 2184 | u64 parent = 0; |
| 2185 | u64 ref_root = 0; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2186 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 2187 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2188 | |
| 2189 | ref = btrfs_delayed_node_to_tree_ref(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2190 | trace_run_delayed_tree_ref(node, ref, node->action); |
| 2191 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2192 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2193 | parent = ref->parent; |
| 2194 | else |
| 2195 | ref_root = ref->root; |
| 2196 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2197 | ins.objectid = node->bytenr; |
| 2198 | if (skinny_metadata) { |
| 2199 | ins.offset = ref->level; |
| 2200 | ins.type = BTRFS_METADATA_ITEM_KEY; |
| 2201 | } else { |
| 2202 | ins.offset = node->num_bytes; |
| 2203 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
| 2204 | } |
| 2205 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2206 | BUG_ON(node->ref_mod != 1); |
| 2207 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 2208 | BUG_ON(!extent_op || !extent_op->update_flags); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2209 | ret = alloc_reserved_tree_block(trans, root, |
| 2210 | parent, ref_root, |
| 2211 | extent_op->flags_to_set, |
| 2212 | &extent_op->key, |
| 2213 | ref->level, &ins); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2214 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
| 2215 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, |
| 2216 | node->num_bytes, parent, ref_root, |
| 2217 | ref->level, 0, 1, extent_op); |
| 2218 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
| 2219 | ret = __btrfs_free_extent(trans, root, node->bytenr, |
| 2220 | node->num_bytes, parent, ref_root, |
| 2221 | ref->level, 0, 1, extent_op); |
| 2222 | } else { |
| 2223 | BUG(); |
| 2224 | } |
| 2225 | return ret; |
| 2226 | } |
| 2227 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2228 | /* helper function to actually process a single delayed ref entry */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2229 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
| 2230 | struct btrfs_root *root, |
| 2231 | struct btrfs_delayed_ref_node *node, |
| 2232 | struct btrfs_delayed_extent_op *extent_op, |
| 2233 | int insert_reserved) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2234 | { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2235 | int ret = 0; |
| 2236 | |
| 2237 | if (trans->aborted) |
| 2238 | return 0; |
| 2239 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2240 | if (btrfs_delayed_ref_is_head(node)) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2241 | struct btrfs_delayed_ref_head *head; |
| 2242 | /* |
| 2243 | * we've hit the end of the chain and we were supposed |
| 2244 | * to insert this extent into the tree. But, it got |
| 2245 | * deleted before we ever needed to insert it, so all |
| 2246 | * we have to do is clean up the accounting |
| 2247 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2248 | BUG_ON(extent_op); |
| 2249 | head = btrfs_delayed_node_to_head(node); |
Liu Bo | 599c75e | 2013-07-16 19:03:36 +0800 | [diff] [blame] | 2250 | trace_run_delayed_ref_head(node, head, node->action); |
| 2251 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2252 | if (insert_reserved) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 2253 | btrfs_pin_extent(root, node->bytenr, |
| 2254 | node->num_bytes, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2255 | if (head->is_data) { |
| 2256 | ret = btrfs_del_csums(trans, root, |
| 2257 | node->bytenr, |
| 2258 | node->num_bytes); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2259 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2260 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2261 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2262 | } |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 2263 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2264 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
| 2265 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
| 2266 | ret = run_delayed_tree_ref(trans, root, node, extent_op, |
| 2267 | insert_reserved); |
| 2268 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || |
| 2269 | node->type == BTRFS_SHARED_DATA_REF_KEY) |
| 2270 | ret = run_delayed_data_ref(trans, root, node, extent_op, |
| 2271 | insert_reserved); |
| 2272 | else |
| 2273 | BUG(); |
| 2274 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2275 | } |
| 2276 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2277 | static noinline struct btrfs_delayed_ref_node * |
| 2278 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2279 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2280 | struct rb_node *node; |
| 2281 | struct btrfs_delayed_ref_node *ref; |
| 2282 | int action = BTRFS_ADD_DELAYED_REF; |
| 2283 | again: |
| 2284 | /* |
| 2285 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. |
| 2286 | * this prevents ref count from going down to zero when |
| 2287 | * there still are pending delayed ref. |
| 2288 | */ |
| 2289 | node = rb_prev(&head->node.rb_node); |
| 2290 | while (1) { |
| 2291 | if (!node) |
| 2292 | break; |
| 2293 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 2294 | rb_node); |
| 2295 | if (ref->bytenr != head->node.bytenr) |
| 2296 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2297 | if (ref->action == action) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2298 | return ref; |
| 2299 | node = rb_prev(node); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2300 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2301 | if (action == BTRFS_ADD_DELAYED_REF) { |
| 2302 | action = BTRFS_DROP_DELAYED_REF; |
| 2303 | goto again; |
| 2304 | } |
| 2305 | return NULL; |
| 2306 | } |
| 2307 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2308 | /* |
| 2309 | * Returns 0 on success or if called with an already aborted transaction. |
| 2310 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. |
| 2311 | */ |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2312 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
| 2313 | struct btrfs_root *root, |
| 2314 | struct list_head *cluster) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2315 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2316 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2317 | struct btrfs_delayed_ref_node *ref; |
| 2318 | struct btrfs_delayed_ref_head *locked_ref = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2319 | struct btrfs_delayed_extent_op *extent_op; |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2320 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2321 | int ret; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2322 | int count = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2323 | int must_insert_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2324 | |
| 2325 | delayed_refs = &trans->transaction->delayed_refs; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2326 | while (1) { |
| 2327 | if (!locked_ref) { |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2328 | /* pick a new head ref from the cluster list */ |
| 2329 | if (list_empty(cluster)) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2330 | break; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2331 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2332 | locked_ref = list_entry(cluster->next, |
| 2333 | struct btrfs_delayed_ref_head, cluster); |
| 2334 | |
| 2335 | /* grab the lock that says we are going to process |
| 2336 | * all the refs for this head */ |
| 2337 | ret = btrfs_delayed_ref_lock(trans, locked_ref); |
| 2338 | |
| 2339 | /* |
| 2340 | * we may have dropped the spin lock to get the head |
| 2341 | * mutex lock, and that might have given someone else |
| 2342 | * time to free the head. If that's true, it has been |
| 2343 | * removed from our list and we can move on. |
| 2344 | */ |
| 2345 | if (ret == -EAGAIN) { |
| 2346 | locked_ref = NULL; |
| 2347 | count++; |
| 2348 | continue; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2349 | } |
| 2350 | } |
| 2351 | |
| 2352 | /* |
Josef Bacik | ae1e206 | 2012-08-07 16:00:32 -0400 | [diff] [blame] | 2353 | * We need to try and merge add/drops of the same ref since we |
| 2354 | * can run into issues with relocate dropping the implicit ref |
| 2355 | * and then it being added back again before the drop can |
| 2356 | * finish. If we merged anything we need to re-loop so we can |
| 2357 | * get a good ref. |
| 2358 | */ |
| 2359 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, |
| 2360 | locked_ref); |
| 2361 | |
| 2362 | /* |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2363 | * locked_ref is the head node, so we have to go one |
| 2364 | * node back for any delayed ref updates |
| 2365 | */ |
| 2366 | ref = select_delayed_ref(locked_ref); |
| 2367 | |
| 2368 | if (ref && ref->seq && |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2369 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2370 | /* |
| 2371 | * there are still refs with lower seq numbers in the |
| 2372 | * process of being added. Don't run this ref yet. |
| 2373 | */ |
| 2374 | list_del_init(&locked_ref->cluster); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2375 | btrfs_delayed_ref_unlock(locked_ref); |
Arne Jansen | d1270cd | 2011-09-13 15:16:43 +0200 | [diff] [blame] | 2376 | locked_ref = NULL; |
| 2377 | delayed_refs->num_heads_ready++; |
| 2378 | spin_unlock(&delayed_refs->lock); |
| 2379 | cond_resched(); |
| 2380 | spin_lock(&delayed_refs->lock); |
| 2381 | continue; |
| 2382 | } |
| 2383 | |
| 2384 | /* |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2385 | * record the must insert reserved flag before we |
| 2386 | * drop the spin lock. |
| 2387 | */ |
| 2388 | must_insert_reserved = locked_ref->must_insert_reserved; |
| 2389 | locked_ref->must_insert_reserved = 0; |
| 2390 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2391 | extent_op = locked_ref->extent_op; |
| 2392 | locked_ref->extent_op = NULL; |
| 2393 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2394 | if (!ref) { |
| 2395 | /* All delayed refs have been processed, Go ahead |
| 2396 | * and send the head node to run_one_delayed_ref, |
| 2397 | * so that any accounting fixes can happen |
| 2398 | */ |
| 2399 | ref = &locked_ref->node; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2400 | |
| 2401 | if (extent_op && must_insert_reserved) { |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2402 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2403 | extent_op = NULL; |
| 2404 | } |
| 2405 | |
| 2406 | if (extent_op) { |
| 2407 | spin_unlock(&delayed_refs->lock); |
| 2408 | |
| 2409 | ret = run_delayed_extent_op(trans, root, |
| 2410 | ref, extent_op); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2411 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2412 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2413 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2414 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
Dan Carpenter | 253beeb | 2012-04-18 09:59:03 +0300 | [diff] [blame] | 2415 | spin_lock(&delayed_refs->lock); |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2416 | btrfs_delayed_ref_unlock(locked_ref); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2417 | return ret; |
| 2418 | } |
| 2419 | |
Chris Mason | 203bf28 | 2012-01-06 15:23:57 -0500 | [diff] [blame] | 2420 | goto next; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2421 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2422 | } |
| 2423 | |
| 2424 | ref->in_tree = 0; |
| 2425 | rb_erase(&ref->rb_node, &delayed_refs->root); |
| 2426 | delayed_refs->num_entries--; |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2427 | if (!btrfs_delayed_ref_is_head(ref)) { |
Arne Jansen | 22cd2e7 | 2012-08-09 00:16:53 -0600 | [diff] [blame] | 2428 | /* |
| 2429 | * when we play the delayed ref, also correct the |
| 2430 | * ref_mod on head |
| 2431 | */ |
| 2432 | switch (ref->action) { |
| 2433 | case BTRFS_ADD_DELAYED_REF: |
| 2434 | case BTRFS_ADD_DELAYED_EXTENT: |
| 2435 | locked_ref->node.ref_mod -= ref->ref_mod; |
| 2436 | break; |
| 2437 | case BTRFS_DROP_DELAYED_REF: |
| 2438 | locked_ref->node.ref_mod += ref->ref_mod; |
| 2439 | break; |
| 2440 | default: |
| 2441 | WARN_ON(1); |
| 2442 | } |
Josef Bacik | b8d0c69 | 2013-08-22 17:03:29 -0400 | [diff] [blame] | 2443 | } else { |
| 2444 | list_del_init(&locked_ref->cluster); |
Arne Jansen | 22cd2e7 | 2012-08-09 00:16:53 -0600 | [diff] [blame] | 2445 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2446 | spin_unlock(&delayed_refs->lock); |
| 2447 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2448 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2449 | must_insert_reserved); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2450 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2451 | btrfs_free_delayed_extent_op(extent_op); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2452 | if (ret) { |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2453 | btrfs_delayed_ref_unlock(locked_ref); |
| 2454 | btrfs_put_delayed_ref(ref); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2455 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
Dan Carpenter | 253beeb | 2012-04-18 09:59:03 +0300 | [diff] [blame] | 2456 | spin_lock(&delayed_refs->lock); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2457 | return ret; |
| 2458 | } |
| 2459 | |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2460 | /* |
| 2461 | * If this node is a head, that means all the refs in this head |
| 2462 | * have been dealt with, and we will pick the next head to deal |
| 2463 | * with, so we must unlock the head and drop it from the cluster |
| 2464 | * list before we release it. |
| 2465 | */ |
| 2466 | if (btrfs_delayed_ref_is_head(ref)) { |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2467 | btrfs_delayed_ref_unlock(locked_ref); |
| 2468 | locked_ref = NULL; |
| 2469 | } |
| 2470 | btrfs_put_delayed_ref(ref); |
| 2471 | count++; |
Chris Mason | 203bf28 | 2012-01-06 15:23:57 -0500 | [diff] [blame] | 2472 | next: |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2473 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2474 | spin_lock(&delayed_refs->lock); |
| 2475 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2476 | return count; |
| 2477 | } |
| 2478 | |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2479 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2480 | /* |
| 2481 | * Normally delayed refs get processed in ascending bytenr order. This |
| 2482 | * correlates in most cases to the order added. To expose dependencies on this |
| 2483 | * order, we start to process the tree in the middle instead of the beginning |
| 2484 | */ |
| 2485 | static u64 find_middle(struct rb_root *root) |
| 2486 | { |
| 2487 | struct rb_node *n = root->rb_node; |
| 2488 | struct btrfs_delayed_ref_node *entry; |
| 2489 | int alt = 1; |
| 2490 | u64 middle; |
| 2491 | u64 first = 0, last = 0; |
| 2492 | |
| 2493 | n = rb_first(root); |
| 2494 | if (n) { |
| 2495 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2496 | first = entry->bytenr; |
| 2497 | } |
| 2498 | n = rb_last(root); |
| 2499 | if (n) { |
| 2500 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2501 | last = entry->bytenr; |
| 2502 | } |
| 2503 | n = root->rb_node; |
| 2504 | |
| 2505 | while (n) { |
| 2506 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); |
| 2507 | WARN_ON(!entry->in_tree); |
| 2508 | |
| 2509 | middle = entry->bytenr; |
| 2510 | |
| 2511 | if (alt) |
| 2512 | n = n->rb_left; |
| 2513 | else |
| 2514 | n = n->rb_right; |
| 2515 | |
| 2516 | alt = 1 - alt; |
| 2517 | } |
| 2518 | return middle; |
| 2519 | } |
| 2520 | #endif |
| 2521 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 2522 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
| 2523 | struct btrfs_fs_info *fs_info) |
| 2524 | { |
| 2525 | struct qgroup_update *qgroup_update; |
| 2526 | int ret = 0; |
| 2527 | |
| 2528 | if (list_empty(&trans->qgroup_ref_list) != |
| 2529 | !trans->delayed_ref_elem.seq) { |
| 2530 | /* list without seq or seq without list */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2531 | btrfs_err(fs_info, |
Jan Schmidt | fc36ed7e | 2013-04-24 16:57:33 +0000 | [diff] [blame] | 2532 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 2533 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
Jan Schmidt | fc36ed7e | 2013-04-24 16:57:33 +0000 | [diff] [blame] | 2534 | (u32)(trans->delayed_ref_elem.seq >> 32), |
| 2535 | (u32)trans->delayed_ref_elem.seq); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 2536 | BUG(); |
| 2537 | } |
| 2538 | |
| 2539 | if (!trans->delayed_ref_elem.seq) |
| 2540 | return 0; |
| 2541 | |
| 2542 | while (!list_empty(&trans->qgroup_ref_list)) { |
| 2543 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, |
| 2544 | struct qgroup_update, list); |
| 2545 | list_del(&qgroup_update->list); |
| 2546 | if (!ret) |
| 2547 | ret = btrfs_qgroup_account_ref( |
| 2548 | trans, fs_info, qgroup_update->node, |
| 2549 | qgroup_update->extent_op); |
| 2550 | kfree(qgroup_update); |
| 2551 | } |
| 2552 | |
| 2553 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); |
| 2554 | |
| 2555 | return ret; |
| 2556 | } |
| 2557 | |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2558 | static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq, |
| 2559 | int count) |
| 2560 | { |
| 2561 | int val = atomic_read(&delayed_refs->ref_seq); |
| 2562 | |
| 2563 | if (val < seq || val >= seq + count) |
| 2564 | return 1; |
| 2565 | return 0; |
| 2566 | } |
| 2567 | |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2568 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
| 2569 | { |
| 2570 | u64 num_bytes; |
| 2571 | |
| 2572 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + |
| 2573 | sizeof(struct btrfs_extent_inline_ref)); |
| 2574 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| 2575 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); |
| 2576 | |
| 2577 | /* |
| 2578 | * We don't ever fill up leaves all the way so multiply by 2 just to be |
| 2579 | * closer to what we're really going to want to ouse. |
| 2580 | */ |
| 2581 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); |
| 2582 | } |
| 2583 | |
| 2584 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
| 2585 | struct btrfs_root *root) |
| 2586 | { |
| 2587 | struct btrfs_block_rsv *global_rsv; |
| 2588 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; |
| 2589 | u64 num_bytes; |
| 2590 | int ret = 0; |
| 2591 | |
| 2592 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 2593 | num_heads = heads_to_leaves(root, num_heads); |
| 2594 | if (num_heads > 1) |
| 2595 | num_bytes += (num_heads - 1) * root->leafsize; |
| 2596 | num_bytes <<= 1; |
| 2597 | global_rsv = &root->fs_info->global_block_rsv; |
| 2598 | |
| 2599 | /* |
| 2600 | * If we can't allocate any more chunks lets make sure we have _lots_ of |
| 2601 | * wiggle room since running delayed refs can create more delayed refs. |
| 2602 | */ |
| 2603 | if (global_rsv->space_info->full) |
| 2604 | num_bytes <<= 1; |
| 2605 | |
| 2606 | spin_lock(&global_rsv->lock); |
| 2607 | if (global_rsv->reserved <= num_bytes) |
| 2608 | ret = 1; |
| 2609 | spin_unlock(&global_rsv->lock); |
| 2610 | return ret; |
| 2611 | } |
| 2612 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2613 | /* |
| 2614 | * this starts processing the delayed reference count updates and |
| 2615 | * extent insertions we have queued up so far. count can be |
| 2616 | * 0, which means to process everything in the tree at the start |
| 2617 | * of the run (but not newly added entries), or it can be some target |
| 2618 | * number you'd like to process. |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2619 | * |
| 2620 | * Returns 0 on success or if called with an aborted transaction |
| 2621 | * Returns <0 on error and aborts the transaction |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2622 | */ |
| 2623 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 2624 | struct btrfs_root *root, unsigned long count) |
| 2625 | { |
| 2626 | struct rb_node *node; |
| 2627 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2628 | struct btrfs_delayed_ref_node *ref; |
| 2629 | struct list_head cluster; |
| 2630 | int ret; |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 2631 | u64 delayed_start; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2632 | int run_all = count == (unsigned long)-1; |
| 2633 | int run_most = 0; |
Arne Jansen | 1fa11e2 | 2012-08-06 14:18:51 -0600 | [diff] [blame] | 2634 | int loops; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2635 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2636 | /* We'll clean this up in btrfs_cleanup_transaction */ |
| 2637 | if (trans->aborted) |
| 2638 | return 0; |
| 2639 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2640 | if (root == root->fs_info->extent_root) |
| 2641 | root = root->fs_info->tree_root; |
| 2642 | |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 2643 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
| 2644 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2645 | delayed_refs = &trans->transaction->delayed_refs; |
| 2646 | INIT_LIST_HEAD(&cluster); |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2647 | if (count == 0) { |
| 2648 | count = delayed_refs->num_entries * 2; |
| 2649 | run_most = 1; |
| 2650 | } |
| 2651 | |
| 2652 | if (!run_all && !run_most) { |
| 2653 | int old; |
| 2654 | int seq = atomic_read(&delayed_refs->ref_seq); |
| 2655 | |
| 2656 | progress: |
| 2657 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); |
| 2658 | if (old) { |
| 2659 | DEFINE_WAIT(__wait); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2660 | if (delayed_refs->flushing || |
| 2661 | !btrfs_should_throttle_delayed_refs(trans, root)) |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2662 | return 0; |
| 2663 | |
| 2664 | prepare_to_wait(&delayed_refs->wait, &__wait, |
| 2665 | TASK_UNINTERRUPTIBLE); |
| 2666 | |
| 2667 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); |
| 2668 | if (old) { |
| 2669 | schedule(); |
| 2670 | finish_wait(&delayed_refs->wait, &__wait); |
| 2671 | |
| 2672 | if (!refs_newer(delayed_refs, seq, 256)) |
| 2673 | goto progress; |
| 2674 | else |
| 2675 | return 0; |
| 2676 | } else { |
| 2677 | finish_wait(&delayed_refs->wait, &__wait); |
| 2678 | goto again; |
| 2679 | } |
| 2680 | } |
| 2681 | |
| 2682 | } else { |
| 2683 | atomic_inc(&delayed_refs->procs_running_refs); |
| 2684 | } |
| 2685 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2686 | again: |
Arne Jansen | 1fa11e2 | 2012-08-06 14:18:51 -0600 | [diff] [blame] | 2687 | loops = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2688 | spin_lock(&delayed_refs->lock); |
Jan Schmidt | 097b8a7 | 2012-06-21 11:08:04 +0200 | [diff] [blame] | 2689 | |
Arne Jansen | 709c048 | 2011-09-12 12:22:57 +0200 | [diff] [blame] | 2690 | #ifdef SCRAMBLE_DELAYED_REFS |
| 2691 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); |
| 2692 | #endif |
| 2693 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2694 | while (1) { |
| 2695 | if (!(run_all || run_most) && |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 2696 | !btrfs_should_throttle_delayed_refs(trans, root)) |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2697 | break; |
| 2698 | |
| 2699 | /* |
| 2700 | * go find something we can process in the rbtree. We start at |
| 2701 | * the beginning of the tree, and then build a cluster |
| 2702 | * of refs to process starting at the first one we are able to |
| 2703 | * lock |
| 2704 | */ |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 2705 | delayed_start = delayed_refs->run_delayed_start; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2706 | ret = btrfs_find_ref_cluster(trans, &cluster, |
| 2707 | delayed_refs->run_delayed_start); |
| 2708 | if (ret) |
| 2709 | break; |
| 2710 | |
| 2711 | ret = run_clustered_refs(trans, root, &cluster); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2712 | if (ret < 0) { |
Miao Xie | 093486c | 2012-12-19 08:10:10 +0000 | [diff] [blame] | 2713 | btrfs_release_ref_cluster(&cluster); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2714 | spin_unlock(&delayed_refs->lock); |
| 2715 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2716 | atomic_dec(&delayed_refs->procs_running_refs); |
Josef Bacik | f971fe2 | 2013-06-10 11:52:32 -0400 | [diff] [blame] | 2717 | wake_up(&delayed_refs->wait); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2718 | return ret; |
| 2719 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2720 | |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2721 | atomic_add(ret, &delayed_refs->ref_seq); |
| 2722 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2723 | count -= min_t(unsigned long, ret, count); |
| 2724 | |
| 2725 | if (count == 0) |
| 2726 | break; |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 2727 | |
Arne Jansen | 1fa11e2 | 2012-08-06 14:18:51 -0600 | [diff] [blame] | 2728 | if (delayed_start >= delayed_refs->run_delayed_start) { |
| 2729 | if (loops == 0) { |
| 2730 | /* |
| 2731 | * btrfs_find_ref_cluster looped. let's do one |
| 2732 | * more cycle. if we don't run any delayed ref |
| 2733 | * during that cycle (because we can't because |
| 2734 | * all of them are blocked), bail out. |
| 2735 | */ |
| 2736 | loops = 1; |
| 2737 | } else { |
| 2738 | /* |
| 2739 | * no runnable refs left, stop trying |
| 2740 | */ |
| 2741 | BUG_ON(run_all); |
| 2742 | break; |
| 2743 | } |
| 2744 | } |
| 2745 | if (ret) { |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 2746 | /* refs were run, let's reset staleness detection */ |
Arne Jansen | 1fa11e2 | 2012-08-06 14:18:51 -0600 | [diff] [blame] | 2747 | loops = 0; |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 2748 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2749 | } |
| 2750 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2751 | if (run_all) { |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 2752 | if (!list_empty(&trans->new_bgs)) { |
| 2753 | spin_unlock(&delayed_refs->lock); |
| 2754 | btrfs_create_pending_block_groups(trans, root); |
| 2755 | spin_lock(&delayed_refs->lock); |
| 2756 | } |
| 2757 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2758 | node = rb_first(&delayed_refs->root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2759 | if (!node) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2760 | goto out; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2761 | count = (unsigned long)-1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2762 | |
| 2763 | while (node) { |
| 2764 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 2765 | rb_node); |
| 2766 | if (btrfs_delayed_ref_is_head(ref)) { |
| 2767 | struct btrfs_delayed_ref_head *head; |
| 2768 | |
| 2769 | head = btrfs_delayed_node_to_head(ref); |
| 2770 | atomic_inc(&ref->refs); |
| 2771 | |
| 2772 | spin_unlock(&delayed_refs->lock); |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2773 | /* |
| 2774 | * Mutex was contended, block until it's |
| 2775 | * released and try again |
| 2776 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2777 | mutex_lock(&head->mutex); |
| 2778 | mutex_unlock(&head->mutex); |
| 2779 | |
| 2780 | btrfs_put_delayed_ref(ref); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2781 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2782 | goto again; |
| 2783 | } |
| 2784 | node = rb_next(node); |
| 2785 | } |
| 2786 | spin_unlock(&delayed_refs->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2787 | schedule_timeout(1); |
| 2788 | goto again; |
| 2789 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2790 | out: |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 2791 | atomic_dec(&delayed_refs->procs_running_refs); |
| 2792 | smp_mb(); |
| 2793 | if (waitqueue_active(&delayed_refs->wait)) |
| 2794 | wake_up(&delayed_refs->wait); |
| 2795 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2796 | spin_unlock(&delayed_refs->lock); |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 2797 | assert_qgroups_uptodate(trans); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2798 | return 0; |
| 2799 | } |
| 2800 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2801 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
| 2802 | struct btrfs_root *root, |
| 2803 | u64 bytenr, u64 num_bytes, u64 flags, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2804 | int level, int is_data) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2805 | { |
| 2806 | struct btrfs_delayed_extent_op *extent_op; |
| 2807 | int ret; |
| 2808 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2809 | extent_op = btrfs_alloc_delayed_extent_op(); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2810 | if (!extent_op) |
| 2811 | return -ENOMEM; |
| 2812 | |
| 2813 | extent_op->flags_to_set = flags; |
| 2814 | extent_op->update_flags = 1; |
| 2815 | extent_op->update_key = 0; |
| 2816 | extent_op->is_data = is_data ? 1 : 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 2817 | extent_op->level = level; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2818 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 2819 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
| 2820 | num_bytes, extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2821 | if (ret) |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2822 | btrfs_free_delayed_extent_op(extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2823 | return ret; |
| 2824 | } |
| 2825 | |
| 2826 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, |
| 2827 | struct btrfs_root *root, |
| 2828 | struct btrfs_path *path, |
| 2829 | u64 objectid, u64 offset, u64 bytenr) |
| 2830 | { |
| 2831 | struct btrfs_delayed_ref_head *head; |
| 2832 | struct btrfs_delayed_ref_node *ref; |
| 2833 | struct btrfs_delayed_data_ref *data_ref; |
| 2834 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2835 | struct rb_node *node; |
| 2836 | int ret = 0; |
| 2837 | |
| 2838 | ret = -ENOENT; |
| 2839 | delayed_refs = &trans->transaction->delayed_refs; |
| 2840 | spin_lock(&delayed_refs->lock); |
| 2841 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 2842 | if (!head) |
| 2843 | goto out; |
| 2844 | |
| 2845 | if (!mutex_trylock(&head->mutex)) { |
| 2846 | atomic_inc(&head->node.refs); |
| 2847 | spin_unlock(&delayed_refs->lock); |
| 2848 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2849 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2850 | |
David Sterba | 8cc33e5 | 2011-05-02 15:29:25 +0200 | [diff] [blame] | 2851 | /* |
| 2852 | * Mutex was contended, block until it's released and let |
| 2853 | * caller try again |
| 2854 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2855 | mutex_lock(&head->mutex); |
| 2856 | mutex_unlock(&head->mutex); |
| 2857 | btrfs_put_delayed_ref(&head->node); |
| 2858 | return -EAGAIN; |
| 2859 | } |
| 2860 | |
| 2861 | node = rb_prev(&head->node.rb_node); |
| 2862 | if (!node) |
| 2863 | goto out_unlock; |
| 2864 | |
| 2865 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
| 2866 | |
| 2867 | if (ref->bytenr != bytenr) |
| 2868 | goto out_unlock; |
| 2869 | |
| 2870 | ret = 1; |
| 2871 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) |
| 2872 | goto out_unlock; |
| 2873 | |
| 2874 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
| 2875 | |
| 2876 | node = rb_prev(node); |
| 2877 | if (node) { |
Liu Bo | df57dbe | 2012-07-23 05:50:03 -0600 | [diff] [blame] | 2878 | int seq = ref->seq; |
| 2879 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2880 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
Liu Bo | df57dbe | 2012-07-23 05:50:03 -0600 | [diff] [blame] | 2881 | if (ref->bytenr == bytenr && ref->seq == seq) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2882 | goto out_unlock; |
| 2883 | } |
| 2884 | |
| 2885 | if (data_ref->root != root->root_key.objectid || |
| 2886 | data_ref->objectid != objectid || data_ref->offset != offset) |
| 2887 | goto out_unlock; |
| 2888 | |
| 2889 | ret = 0; |
| 2890 | out_unlock: |
| 2891 | mutex_unlock(&head->mutex); |
| 2892 | out: |
| 2893 | spin_unlock(&delayed_refs->lock); |
| 2894 | return ret; |
| 2895 | } |
| 2896 | |
| 2897 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, |
| 2898 | struct btrfs_root *root, |
| 2899 | struct btrfs_path *path, |
| 2900 | u64 objectid, u64 offset, u64 bytenr) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2901 | { |
| 2902 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2903 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2904 | struct btrfs_extent_data_ref *ref; |
| 2905 | struct btrfs_extent_inline_ref *iref; |
| 2906 | struct btrfs_extent_item *ei; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2907 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2908 | u32 item_size; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2909 | int ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2910 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2911 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2912 | key.offset = (u64)-1; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2913 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2914 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2915 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 2916 | if (ret < 0) |
| 2917 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2918 | BUG_ON(ret == 0); /* Corruption */ |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 2919 | |
| 2920 | ret = -ENOENT; |
| 2921 | if (path->slots[0] == 0) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2922 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2923 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2924 | path->slots[0]--; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2925 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2926 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2927 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2928 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2929 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2930 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2931 | ret = 1; |
| 2932 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2933 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 2934 | if (item_size < sizeof(*ei)) { |
| 2935 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); |
| 2936 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2937 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2938 | #endif |
| 2939 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
| 2940 | |
| 2941 | if (item_size != sizeof(*ei) + |
| 2942 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) |
| 2943 | goto out; |
| 2944 | |
| 2945 | if (btrfs_extent_generation(leaf, ei) <= |
| 2946 | btrfs_root_last_snapshot(&root->root_item)) |
| 2947 | goto out; |
| 2948 | |
| 2949 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| 2950 | if (btrfs_extent_inline_ref_type(leaf, iref) != |
| 2951 | BTRFS_EXTENT_DATA_REF_KEY) |
| 2952 | goto out; |
| 2953 | |
| 2954 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 2955 | if (btrfs_extent_refs(leaf, ei) != |
| 2956 | btrfs_extent_data_ref_count(leaf, ref) || |
| 2957 | btrfs_extent_data_ref_root(leaf, ref) != |
| 2958 | root->root_key.objectid || |
| 2959 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || |
| 2960 | btrfs_extent_data_ref_offset(leaf, ref) != offset) |
| 2961 | goto out; |
| 2962 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2963 | ret = 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 2964 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2965 | return ret; |
| 2966 | } |
| 2967 | |
| 2968 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
| 2969 | struct btrfs_root *root, |
| 2970 | u64 objectid, u64 offset, u64 bytenr) |
| 2971 | { |
| 2972 | struct btrfs_path *path; |
| 2973 | int ret; |
| 2974 | int ret2; |
| 2975 | |
| 2976 | path = btrfs_alloc_path(); |
| 2977 | if (!path) |
| 2978 | return -ENOENT; |
| 2979 | |
| 2980 | do { |
| 2981 | ret = check_committed_ref(trans, root, path, objectid, |
| 2982 | offset, bytenr); |
| 2983 | if (ret && ret != -ENOENT) |
| 2984 | goto out; |
| 2985 | |
| 2986 | ret2 = check_delayed_ref(trans, root, path, objectid, |
| 2987 | offset, bytenr); |
| 2988 | } while (ret2 == -EAGAIN); |
| 2989 | |
| 2990 | if (ret2 && ret2 != -ENOENT) { |
| 2991 | ret = ret2; |
| 2992 | goto out; |
| 2993 | } |
| 2994 | |
| 2995 | if (ret != -ENOENT || ret2 != -ENOENT) |
| 2996 | ret = 0; |
| 2997 | out: |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 2998 | btrfs_free_path(path); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 2999 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 3000 | WARN_ON(ret > 0); |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 3001 | return ret; |
| 3002 | } |
| 3003 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3004 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3005 | struct btrfs_root *root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3006 | struct extent_buffer *buf, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3007 | int full_backref, int inc, int for_cow) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3008 | { |
| 3009 | u64 bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3010 | u64 num_bytes; |
| 3011 | u64 parent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3012 | u64 ref_root; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3013 | u32 nritems; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3014 | struct btrfs_key key; |
| 3015 | struct btrfs_file_extent_item *fi; |
| 3016 | int i; |
| 3017 | int level; |
| 3018 | int ret = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3019 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3020 | u64, u64, u64, u64, u64, u64, int); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3021 | |
| 3022 | ref_root = btrfs_header_owner(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3023 | nritems = btrfs_header_nritems(buf); |
| 3024 | level = btrfs_header_level(buf); |
| 3025 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3026 | if (!root->ref_cows && level == 0) |
| 3027 | return 0; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3028 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3029 | if (inc) |
| 3030 | process_func = btrfs_inc_extent_ref; |
| 3031 | else |
| 3032 | process_func = btrfs_free_extent; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3033 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3034 | if (full_backref) |
| 3035 | parent = buf->start; |
| 3036 | else |
| 3037 | parent = 0; |
| 3038 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3039 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3040 | if (level == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3041 | btrfs_item_key_to_cpu(buf, &key, i); |
| 3042 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3043 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3044 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3045 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3046 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3047 | BTRFS_FILE_EXTENT_INLINE) |
| 3048 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3049 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 3050 | if (bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3051 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3052 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3053 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); |
| 3054 | key.offset -= btrfs_file_extent_offset(buf, fi); |
| 3055 | ret = process_func(trans, root, bytenr, num_bytes, |
| 3056 | parent, ref_root, key.objectid, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3057 | key.offset, for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3058 | if (ret) |
| 3059 | goto fail; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 3060 | } else { |
| 3061 | bytenr = btrfs_node_blockptr(buf, i); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3062 | num_bytes = btrfs_level_size(root, level - 1); |
| 3063 | ret = process_func(trans, root, bytenr, num_bytes, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3064 | parent, ref_root, level - 1, 0, |
| 3065 | for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3066 | if (ret) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3067 | goto fail; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3068 | } |
| 3069 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3070 | return 0; |
| 3071 | fail: |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3072 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 3073 | } |
| 3074 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3075 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3076 | struct extent_buffer *buf, int full_backref, int for_cow) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3077 | { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3078 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3079 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3080 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3081 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3082 | struct extent_buffer *buf, int full_backref, int for_cow) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3083 | { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3084 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3085 | } |
| 3086 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3087 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 3088 | struct btrfs_root *root, |
| 3089 | struct btrfs_path *path, |
| 3090 | struct btrfs_block_group_cache *cache) |
| 3091 | { |
| 3092 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3093 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3094 | unsigned long bi; |
| 3095 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3096 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3097 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3098 | if (ret < 0) |
| 3099 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3100 | BUG_ON(ret); /* Corruption */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3101 | |
| 3102 | leaf = path->nodes[0]; |
| 3103 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 3104 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 3105 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3106 | btrfs_release_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3107 | fail: |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3108 | if (ret) { |
| 3109 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3110 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3111 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3112 | return 0; |
| 3113 | |
| 3114 | } |
| 3115 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3116 | static struct btrfs_block_group_cache * |
| 3117 | next_block_group(struct btrfs_root *root, |
| 3118 | struct btrfs_block_group_cache *cache) |
| 3119 | { |
| 3120 | struct rb_node *node; |
| 3121 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 3122 | node = rb_next(&cache->cache_node); |
| 3123 | btrfs_put_block_group(cache); |
| 3124 | if (node) { |
| 3125 | cache = rb_entry(node, struct btrfs_block_group_cache, |
| 3126 | cache_node); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 3127 | btrfs_get_block_group(cache); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3128 | } else |
| 3129 | cache = NULL; |
| 3130 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 3131 | return cache; |
| 3132 | } |
| 3133 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3134 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
| 3135 | struct btrfs_trans_handle *trans, |
| 3136 | struct btrfs_path *path) |
| 3137 | { |
| 3138 | struct btrfs_root *root = block_group->fs_info->tree_root; |
| 3139 | struct inode *inode = NULL; |
| 3140 | u64 alloc_hint = 0; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3141 | int dcs = BTRFS_DC_ERROR; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3142 | int num_pages = 0; |
| 3143 | int retries = 0; |
| 3144 | int ret = 0; |
| 3145 | |
| 3146 | /* |
| 3147 | * If this block group is smaller than 100 megs don't bother caching the |
| 3148 | * block group. |
| 3149 | */ |
| 3150 | if (block_group->key.offset < (100 * 1024 * 1024)) { |
| 3151 | spin_lock(&block_group->lock); |
| 3152 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 3153 | spin_unlock(&block_group->lock); |
| 3154 | return 0; |
| 3155 | } |
| 3156 | |
| 3157 | again: |
| 3158 | inode = lookup_free_space_inode(root, block_group, path); |
| 3159 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { |
| 3160 | ret = PTR_ERR(inode); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3161 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3162 | goto out; |
| 3163 | } |
| 3164 | |
| 3165 | if (IS_ERR(inode)) { |
| 3166 | BUG_ON(retries); |
| 3167 | retries++; |
| 3168 | |
| 3169 | if (block_group->ro) |
| 3170 | goto out_free; |
| 3171 | |
| 3172 | ret = create_free_space_inode(root, trans, block_group, path); |
| 3173 | if (ret) |
| 3174 | goto out_free; |
| 3175 | goto again; |
| 3176 | } |
| 3177 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3178 | /* We've already setup this transaction, go ahead and exit */ |
| 3179 | if (block_group->cache_generation == trans->transid && |
| 3180 | i_size_read(inode)) { |
| 3181 | dcs = BTRFS_DC_SETUP; |
| 3182 | goto out_put; |
| 3183 | } |
| 3184 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3185 | /* |
| 3186 | * We want to set the generation to 0, that way if anything goes wrong |
| 3187 | * from here on out we know not to trust this cache when we load up next |
| 3188 | * time. |
| 3189 | */ |
| 3190 | BTRFS_I(inode)->generation = 0; |
| 3191 | ret = btrfs_update_inode(trans, root, inode); |
| 3192 | WARN_ON(ret); |
| 3193 | |
| 3194 | if (i_size_read(inode) > 0) { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 3195 | ret = btrfs_check_trunc_cache_free_space(root, |
| 3196 | &root->fs_info->global_block_rsv); |
| 3197 | if (ret) |
| 3198 | goto out_put; |
| 3199 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3200 | ret = btrfs_truncate_free_space_cache(root, trans, path, |
| 3201 | inode); |
| 3202 | if (ret) |
| 3203 | goto out_put; |
| 3204 | } |
| 3205 | |
| 3206 | spin_lock(&block_group->lock); |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 3207 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
| 3208 | !btrfs_test_opt(root, SPACE_CACHE)) { |
| 3209 | /* |
| 3210 | * don't bother trying to write stuff out _if_ |
| 3211 | * a) we're not cached, |
| 3212 | * b) we're with nospace_cache mount option. |
| 3213 | */ |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3214 | dcs = BTRFS_DC_WRITTEN; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3215 | spin_unlock(&block_group->lock); |
| 3216 | goto out_put; |
| 3217 | } |
| 3218 | spin_unlock(&block_group->lock); |
| 3219 | |
Josef Bacik | 6fc823b | 2012-08-06 13:46:38 -0600 | [diff] [blame] | 3220 | /* |
| 3221 | * Try to preallocate enough space based on how big the block group is. |
| 3222 | * Keep in mind this has to include any pinned space which could end up |
| 3223 | * taking up quite a bit since it's not folded into the other space |
| 3224 | * cache. |
| 3225 | */ |
| 3226 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3227 | if (!num_pages) |
| 3228 | num_pages = 1; |
| 3229 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3230 | num_pages *= 16; |
| 3231 | num_pages *= PAGE_CACHE_SIZE; |
| 3232 | |
| 3233 | ret = btrfs_check_data_free_space(inode, num_pages); |
| 3234 | if (ret) |
| 3235 | goto out_put; |
| 3236 | |
| 3237 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, |
| 3238 | num_pages, num_pages, |
| 3239 | &alloc_hint); |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3240 | if (!ret) |
| 3241 | dcs = BTRFS_DC_SETUP; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3242 | btrfs_free_reserved_data_space(inode, num_pages); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3243 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3244 | out_put: |
| 3245 | iput(inode); |
| 3246 | out_free: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3247 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3248 | out: |
| 3249 | spin_lock(&block_group->lock); |
Josef Bacik | e65cbb9 | 2011-12-13 16:04:54 -0500 | [diff] [blame] | 3250 | if (!ret && dcs == BTRFS_DC_SETUP) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 3251 | block_group->cache_generation = trans->transid; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 3252 | block_group->disk_cache_state = dcs; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3253 | spin_unlock(&block_group->lock); |
| 3254 | |
| 3255 | return ret; |
| 3256 | } |
| 3257 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3258 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 3259 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3260 | { |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3261 | struct btrfs_block_group_cache *cache; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3262 | int err = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3263 | struct btrfs_path *path; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3264 | u64 last = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3265 | |
| 3266 | path = btrfs_alloc_path(); |
| 3267 | if (!path) |
| 3268 | return -ENOMEM; |
| 3269 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3270 | again: |
| 3271 | while (1) { |
| 3272 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3273 | while (cache) { |
| 3274 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) |
| 3275 | break; |
| 3276 | cache = next_block_group(root, cache); |
| 3277 | } |
| 3278 | if (!cache) { |
| 3279 | if (last == 0) |
| 3280 | break; |
| 3281 | last = 0; |
| 3282 | continue; |
| 3283 | } |
| 3284 | err = cache_save_setup(cache, trans, path); |
| 3285 | last = cache->key.objectid + cache->key.offset; |
| 3286 | btrfs_put_block_group(cache); |
| 3287 | } |
| 3288 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3289 | while (1) { |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3290 | if (last == 0) { |
| 3291 | err = btrfs_run_delayed_refs(trans, root, |
| 3292 | (unsigned long)-1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3293 | if (err) /* File system offline */ |
| 3294 | goto out; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3295 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3296 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3297 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3298 | while (cache) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3299 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
| 3300 | btrfs_put_block_group(cache); |
| 3301 | goto again; |
| 3302 | } |
| 3303 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3304 | if (cache->dirty) |
| 3305 | break; |
| 3306 | cache = next_block_group(root, cache); |
| 3307 | } |
| 3308 | if (!cache) { |
| 3309 | if (last == 0) |
| 3310 | break; |
| 3311 | last = 0; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3312 | continue; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3313 | } |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3314 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3315 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
| 3316 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3317 | cache->dirty = 0; |
| 3318 | last = cache->key.objectid + cache->key.offset; |
| 3319 | |
| 3320 | err = write_one_cache_group(trans, root, path, cache); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3321 | if (err) /* File system offline */ |
| 3322 | goto out; |
| 3323 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3324 | btrfs_put_block_group(cache); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3325 | } |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 3326 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3327 | while (1) { |
| 3328 | /* |
| 3329 | * I don't think this is needed since we're just marking our |
| 3330 | * preallocated extent as written, but just in case it can't |
| 3331 | * hurt. |
| 3332 | */ |
| 3333 | if (last == 0) { |
| 3334 | err = btrfs_run_delayed_refs(trans, root, |
| 3335 | (unsigned long)-1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3336 | if (err) /* File system offline */ |
| 3337 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3338 | } |
| 3339 | |
| 3340 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
| 3341 | while (cache) { |
| 3342 | /* |
| 3343 | * Really this shouldn't happen, but it could if we |
| 3344 | * couldn't write the entire preallocated extent and |
| 3345 | * splitting the extent resulted in a new block. |
| 3346 | */ |
| 3347 | if (cache->dirty) { |
| 3348 | btrfs_put_block_group(cache); |
| 3349 | goto again; |
| 3350 | } |
| 3351 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
| 3352 | break; |
| 3353 | cache = next_block_group(root, cache); |
| 3354 | } |
| 3355 | if (!cache) { |
| 3356 | if (last == 0) |
| 3357 | break; |
| 3358 | last = 0; |
| 3359 | continue; |
| 3360 | } |
| 3361 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3362 | err = btrfs_write_out_cache(root, trans, cache, path); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3363 | |
| 3364 | /* |
| 3365 | * If we didn't have an error then the cache state is still |
| 3366 | * NEED_WRITE, so we can set it to WRITTEN. |
| 3367 | */ |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3368 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3369 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
| 3370 | last = cache->key.objectid + cache->key.offset; |
| 3371 | btrfs_put_block_group(cache); |
| 3372 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3373 | out: |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 3374 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3375 | btrfs_free_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3376 | return err; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3377 | } |
| 3378 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3379 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
| 3380 | { |
| 3381 | struct btrfs_block_group_cache *block_group; |
| 3382 | int readonly = 0; |
| 3383 | |
| 3384 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
| 3385 | if (!block_group || block_group->ro) |
| 3386 | readonly = 1; |
| 3387 | if (block_group) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3388 | btrfs_put_block_group(block_group); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3389 | return readonly; |
| 3390 | } |
| 3391 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3392 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 3393 | u64 total_bytes, u64 bytes_used, |
| 3394 | struct btrfs_space_info **space_info) |
| 3395 | { |
| 3396 | struct btrfs_space_info *found; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3397 | int i; |
| 3398 | int factor; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3399 | int ret; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3400 | |
| 3401 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | |
| 3402 | BTRFS_BLOCK_GROUP_RAID10)) |
| 3403 | factor = 2; |
| 3404 | else |
| 3405 | factor = 1; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3406 | |
| 3407 | found = __find_space_info(info, flags); |
| 3408 | if (found) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3409 | spin_lock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3410 | found->total_bytes += total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3411 | found->disk_total += total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3412 | found->bytes_used += bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3413 | found->disk_used += bytes_used * factor; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3414 | found->full = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3415 | spin_unlock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3416 | *space_info = found; |
| 3417 | return 0; |
| 3418 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3419 | found = kzalloc(sizeof(*found), GFP_NOFS); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3420 | if (!found) |
| 3421 | return -ENOMEM; |
| 3422 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3423 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
| 3424 | if (ret) { |
| 3425 | kfree(found); |
| 3426 | return ret; |
| 3427 | } |
| 3428 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3429 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
| 3430 | INIT_LIST_HEAD(&found->block_groups[i]); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3431 | init_rwsem(&found->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3432 | spin_lock_init(&found->lock); |
Ilya Dryomov | 52ba692 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3433 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3434 | found->total_bytes = total_bytes; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 3435 | found->disk_total = total_bytes * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3436 | found->bytes_used = bytes_used; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3437 | found->disk_used = bytes_used * factor; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3438 | found->bytes_pinned = 0; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3439 | found->bytes_reserved = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3440 | found->bytes_readonly = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3441 | found->bytes_may_use = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3442 | found->full = 0; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3443 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3444 | found->chunk_alloc = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 3445 | found->flush = 0; |
| 3446 | init_waitqueue_head(&found->wait); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3447 | *space_info = found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 3448 | list_add_rcu(&found->list, &info->space_info); |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3449 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3450 | info->data_sinfo = found; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3451 | return 0; |
| 3452 | } |
| 3453 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3454 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 3455 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 3456 | u64 extra_flags = chunk_to_extended(flags) & |
| 3457 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3458 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3459 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3460 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3461 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 3462 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3463 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 3464 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3465 | fs_info->avail_system_alloc_bits |= extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3466 | write_sequnlock(&fs_info->profiles_lock); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3467 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3468 | |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3469 | /* |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3470 | * returns target flags in extended format or 0 if restripe for this |
| 3471 | * chunk_type is not in progress |
Ilya Dryomov | c6664b4 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 3472 | * |
| 3473 | * should be called with either volume_mutex or balance_lock held |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3474 | */ |
| 3475 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) |
| 3476 | { |
| 3477 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
| 3478 | u64 target = 0; |
| 3479 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3480 | if (!bctl) |
| 3481 | return 0; |
| 3482 | |
| 3483 | if (flags & BTRFS_BLOCK_GROUP_DATA && |
| 3484 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3485 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; |
| 3486 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && |
| 3487 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3488 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; |
| 3489 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && |
| 3490 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
| 3491 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; |
| 3492 | } |
| 3493 | |
| 3494 | return target; |
| 3495 | } |
| 3496 | |
| 3497 | /* |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3498 | * @flags: available profiles in extended format (see ctree.h) |
| 3499 | * |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3500 | * Returns reduced profile in chunk format. If profile changing is in |
| 3501 | * progress (either running or paused) picks the target profile (if it's |
| 3502 | * already available), otherwise falls back to plain reducing. |
Ilya Dryomov | a46d11a | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3503 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 3504 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3505 | { |
Chris Mason | cd02dca | 2010-12-13 14:56:23 -0500 | [diff] [blame] | 3506 | /* |
| 3507 | * we add in the count of missing devices because we want |
| 3508 | * to make sure that any RAID levels on a degraded FS |
| 3509 | * continue to be honored. |
| 3510 | */ |
| 3511 | u64 num_devices = root->fs_info->fs_devices->rw_devices + |
| 3512 | root->fs_info->fs_devices->missing_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3513 | u64 target; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3514 | u64 tmp; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3515 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3516 | /* |
| 3517 | * see if restripe for this chunk_type is in progress, if so |
| 3518 | * try to reduce to the target profile |
| 3519 | */ |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3520 | spin_lock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3521 | target = get_restripe_target(root->fs_info, flags); |
| 3522 | if (target) { |
| 3523 | /* pick target profile only if it's already available */ |
| 3524 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3525 | spin_unlock(&root->fs_info->balance_lock); |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 3526 | return extended_to_chunk(target); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 3527 | } |
| 3528 | } |
| 3529 | spin_unlock(&root->fs_info->balance_lock); |
| 3530 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3531 | /* First, mask out the RAID levels which aren't possible */ |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3532 | if (num_devices == 1) |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3533 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
| 3534 | BTRFS_BLOCK_GROUP_RAID5); |
| 3535 | if (num_devices < 3) |
| 3536 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3537 | if (num_devices < 4) |
| 3538 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 3539 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3540 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
| 3541 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | |
| 3542 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); |
| 3543 | flags &= ~tmp; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3544 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3545 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
| 3546 | tmp = BTRFS_BLOCK_GROUP_RAID6; |
| 3547 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) |
| 3548 | tmp = BTRFS_BLOCK_GROUP_RAID5; |
| 3549 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) |
| 3550 | tmp = BTRFS_BLOCK_GROUP_RAID10; |
| 3551 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) |
| 3552 | tmp = BTRFS_BLOCK_GROUP_RAID1; |
| 3553 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) |
| 3554 | tmp = BTRFS_BLOCK_GROUP_RAID0; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3555 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3556 | return extended_to_chunk(flags | tmp); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3557 | } |
| 3558 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3559 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3560 | { |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 3561 | unsigned seq; |
| 3562 | |
| 3563 | do { |
| 3564 | seq = read_seqbegin(&root->fs_info->profiles_lock); |
| 3565 | |
| 3566 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 3567 | flags |= root->fs_info->avail_data_alloc_bits; |
| 3568 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 3569 | flags |= root->fs_info->avail_system_alloc_bits; |
| 3570 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 3571 | flags |= root->fs_info->avail_metadata_alloc_bits; |
| 3572 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); |
Ilya Dryomov | 6fef8df | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 3573 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3574 | return btrfs_reduce_alloc_profile(root, flags); |
| 3575 | } |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3576 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 3577 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3578 | { |
| 3579 | u64 flags; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3580 | u64 ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3581 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 3582 | if (data) |
| 3583 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 3584 | else if (root == root->fs_info->chunk_root) |
| 3585 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 3586 | else |
| 3587 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 3588 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3589 | ret = get_alloc_profile(root, flags); |
| 3590 | return ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3591 | } |
| 3592 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3593 | /* |
| 3594 | * This will check the space that the inode allocates from to make sure we have |
| 3595 | * enough space for bytes. |
| 3596 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3597 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3598 | { |
| 3599 | struct btrfs_space_info *data_sinfo; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3600 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3601 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3602 | u64 used; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3603 | int ret = 0, committed = 0, alloc_chunk = 1; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3604 | |
| 3605 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3606 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3607 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3608 | if (root == root->fs_info->tree_root || |
| 3609 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3610 | alloc_chunk = 0; |
| 3611 | committed = 1; |
| 3612 | } |
| 3613 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3614 | data_sinfo = fs_info->data_sinfo; |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3615 | if (!data_sinfo) |
| 3616 | goto alloc; |
| 3617 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3618 | again: |
| 3619 | /* make sure we have enough space to handle the data first */ |
| 3620 | spin_lock(&data_sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3621 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
| 3622 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + |
| 3623 | data_sinfo->bytes_may_use; |
Josef Bacik | ab6e2410 | 2010-03-19 14:38:13 +0000 | [diff] [blame] | 3624 | |
| 3625 | if (used + bytes > data_sinfo->total_bytes) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3626 | struct btrfs_trans_handle *trans; |
| 3627 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3628 | /* |
| 3629 | * if we don't have enough free bytes in this space then we need |
| 3630 | * to alloc a new chunk. |
| 3631 | */ |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3632 | if (!data_sinfo->full && alloc_chunk) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3633 | u64 alloc_target; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3634 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3635 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3636 | spin_unlock(&data_sinfo->lock); |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3637 | alloc: |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3638 | alloc_target = btrfs_get_alloc_profile(root, 1); |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3639 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3640 | if (IS_ERR(trans)) |
| 3641 | return PTR_ERR(trans); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3642 | |
| 3643 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3644 | alloc_target, |
| 3645 | CHUNK_ALLOC_NO_FORCE); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3646 | btrfs_end_transaction(trans, root); |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3647 | if (ret < 0) { |
| 3648 | if (ret != -ENOSPC) |
| 3649 | return ret; |
| 3650 | else |
| 3651 | goto commit_trans; |
| 3652 | } |
Chris Mason | 33b4d47 | 2009-09-22 14:45:50 -0400 | [diff] [blame] | 3653 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3654 | if (!data_sinfo) |
| 3655 | data_sinfo = fs_info->data_sinfo; |
| 3656 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3657 | goto again; |
| 3658 | } |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3659 | |
| 3660 | /* |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3661 | * If we don't have enough pinned space to deal with this |
| 3662 | * allocation don't bother committing the transaction. |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3663 | */ |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3664 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
| 3665 | bytes) < 0) |
Josef Bacik | f2bb8f5 | 2011-05-25 13:10:16 -0400 | [diff] [blame] | 3666 | committed = 1; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3667 | spin_unlock(&data_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3668 | |
| 3669 | /* commit the current transaction and try again */ |
Miao Xie | d52a5b5 | 2011-01-05 10:07:18 +0000 | [diff] [blame] | 3670 | commit_trans: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3671 | if (!committed && |
| 3672 | !atomic_read(&root->fs_info->open_ioctl_trans)) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3673 | committed = 1; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 3674 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3675 | trans = btrfs_join_transaction(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3676 | if (IS_ERR(trans)) |
| 3677 | return PTR_ERR(trans); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 3678 | ret = btrfs_commit_transaction(trans, root); |
| 3679 | if (ret) |
| 3680 | return ret; |
| 3681 | goto again; |
| 3682 | } |
| 3683 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3684 | return -ENOSPC; |
| 3685 | } |
| 3686 | data_sinfo->bytes_may_use += bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3687 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3688 | data_sinfo->flags, bytes, 1); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3689 | spin_unlock(&data_sinfo->lock); |
| 3690 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3691 | return 0; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3692 | } |
| 3693 | |
| 3694 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3695 | * Called if we need to clear a data reservation for this inode. |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3696 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3697 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3698 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3699 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3700 | struct btrfs_space_info *data_sinfo; |
| 3701 | |
| 3702 | /* make sure bytes are sectorsize aligned */ |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 3703 | bytes = ALIGN(bytes, root->sectorsize); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3704 | |
Li Zefan | b4d7c3c | 2012-07-09 20:21:07 -0600 | [diff] [blame] | 3705 | data_sinfo = root->fs_info->data_sinfo; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3706 | spin_lock(&data_sinfo->lock); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 3707 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3708 | data_sinfo->bytes_may_use -= bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 3709 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3710 | data_sinfo->flags, bytes, 0); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3711 | spin_unlock(&data_sinfo->lock); |
| 3712 | } |
| 3713 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3714 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
| 3715 | { |
| 3716 | struct list_head *head = &info->space_info; |
| 3717 | struct btrfs_space_info *found; |
| 3718 | |
| 3719 | rcu_read_lock(); |
| 3720 | list_for_each_entry_rcu(found, head, list) { |
| 3721 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3722 | found->force_alloc = CHUNK_ALLOC_FORCE; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3723 | } |
| 3724 | rcu_read_unlock(); |
| 3725 | } |
| 3726 | |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3727 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
| 3728 | { |
| 3729 | return (global->size << 1); |
| 3730 | } |
| 3731 | |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 3732 | static int should_alloc_chunk(struct btrfs_root *root, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3733 | struct btrfs_space_info *sinfo, int force) |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3734 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3735 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3736 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3737 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
Chris Mason | e5bc245 | 2010-10-26 13:37:56 -0400 | [diff] [blame] | 3738 | u64 thresh; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3739 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3740 | if (force == CHUNK_ALLOC_FORCE) |
| 3741 | return 1; |
| 3742 | |
| 3743 | /* |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3744 | * We need to take into account the global rsv because for all intents |
| 3745 | * and purposes it's used space. Don't worry about locking the |
| 3746 | * global_rsv, it doesn't change except when the transaction commits. |
| 3747 | */ |
Josef Bacik | 54338b5 | 2012-08-14 16:20:52 -0400 | [diff] [blame] | 3748 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3749 | num_allocated += calc_global_rsv_need_space(global_rsv); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 3750 | |
| 3751 | /* |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3752 | * in limited mode, we want to have some free space up to |
| 3753 | * about 1% of the FS size. |
| 3754 | */ |
| 3755 | if (force == CHUNK_ALLOC_LIMITED) { |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 3756 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3757 | thresh = max_t(u64, 64 * 1024 * 1024, |
| 3758 | div_factor_fine(thresh, 1)); |
| 3759 | |
| 3760 | if (num_bytes - num_allocated < thresh) |
| 3761 | return 1; |
| 3762 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3763 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3764 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
Josef Bacik | 14ed0ca | 2010-10-15 15:23:48 -0400 | [diff] [blame] | 3765 | return 0; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3766 | return 1; |
| 3767 | } |
| 3768 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3769 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
| 3770 | { |
| 3771 | u64 num_dev; |
| 3772 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3773 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
| 3774 | BTRFS_BLOCK_GROUP_RAID0 | |
| 3775 | BTRFS_BLOCK_GROUP_RAID5 | |
| 3776 | BTRFS_BLOCK_GROUP_RAID6)) |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3777 | num_dev = root->fs_info->fs_devices->rw_devices; |
| 3778 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
| 3779 | num_dev = 2; |
| 3780 | else |
| 3781 | num_dev = 1; /* DUP or single */ |
| 3782 | |
| 3783 | /* metadata for updaing devices and chunk tree */ |
| 3784 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); |
| 3785 | } |
| 3786 | |
| 3787 | static void check_system_chunk(struct btrfs_trans_handle *trans, |
| 3788 | struct btrfs_root *root, u64 type) |
| 3789 | { |
| 3790 | struct btrfs_space_info *info; |
| 3791 | u64 left; |
| 3792 | u64 thresh; |
| 3793 | |
| 3794 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 3795 | spin_lock(&info->lock); |
| 3796 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 3797 | info->bytes_reserved - info->bytes_readonly; |
| 3798 | spin_unlock(&info->lock); |
| 3799 | |
| 3800 | thresh = get_system_chunk_thresh(root, type); |
| 3801 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3802 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
| 3803 | left, thresh, type); |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3804 | dump_space_info(info, 0, 0); |
| 3805 | } |
| 3806 | |
| 3807 | if (left < thresh) { |
| 3808 | u64 flags; |
| 3809 | |
| 3810 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); |
| 3811 | btrfs_alloc_chunk(trans, root, flags); |
| 3812 | } |
| 3813 | } |
| 3814 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3815 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3816 | struct btrfs_root *extent_root, u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3817 | { |
| 3818 | struct btrfs_space_info *space_info; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3819 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3820 | int wait_for_alloc = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3821 | int ret = 0; |
| 3822 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3823 | /* Don't re-enter if we're already allocating a chunk */ |
| 3824 | if (trans->allocating_chunk) |
| 3825 | return -ENOSPC; |
| 3826 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3827 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3828 | if (!space_info) { |
| 3829 | ret = update_space_info(extent_root->fs_info, flags, |
| 3830 | 0, 0, &space_info); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3831 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3832 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3833 | BUG_ON(!space_info); /* Logic error */ |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3834 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3835 | again: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3836 | spin_lock(&space_info->lock); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 3837 | if (force < space_info->force_alloc) |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3838 | force = space_info->force_alloc; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3839 | if (space_info->full) { |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 3840 | if (should_alloc_chunk(extent_root, space_info, force)) |
| 3841 | ret = -ENOSPC; |
| 3842 | else |
| 3843 | ret = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3844 | spin_unlock(&space_info->lock); |
Filipe David Borba Manana | 09fb99a | 2013-08-05 16:25:12 +0100 | [diff] [blame] | 3845 | return ret; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3846 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3847 | |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 3848 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3849 | spin_unlock(&space_info->lock); |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3850 | return 0; |
| 3851 | } else if (space_info->chunk_alloc) { |
| 3852 | wait_for_alloc = 1; |
| 3853 | } else { |
| 3854 | space_info->chunk_alloc = 1; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3855 | } |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3856 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3857 | spin_unlock(&space_info->lock); |
| 3858 | |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3859 | mutex_lock(&fs_info->chunk_mutex); |
| 3860 | |
| 3861 | /* |
| 3862 | * The chunk_mutex is held throughout the entirety of a chunk |
| 3863 | * allocation, so once we've acquired the chunk_mutex we know that the |
| 3864 | * other guy is done and we need to recheck and see if we should |
| 3865 | * allocate. |
| 3866 | */ |
| 3867 | if (wait_for_alloc) { |
| 3868 | mutex_unlock(&fs_info->chunk_mutex); |
| 3869 | wait_for_alloc = 0; |
| 3870 | goto again; |
| 3871 | } |
| 3872 | |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3873 | trans->allocating_chunk = true; |
| 3874 | |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3875 | /* |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 3876 | * If we have mixed data/metadata chunks we want to make sure we keep |
| 3877 | * allocating mixed chunks instead of individual chunks. |
| 3878 | */ |
| 3879 | if (btrfs_mixed_space_info(space_info)) |
| 3880 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); |
| 3881 | |
| 3882 | /* |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3883 | * if we're doing a data chunk, go ahead and make sure that |
| 3884 | * we keep a reasonable number of metadata chunks allocated in the |
| 3885 | * FS as well. |
| 3886 | */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3887 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 3888 | fs_info->data_chunk_allocations++; |
| 3889 | if (!(fs_info->data_chunk_allocations % |
| 3890 | fs_info->metadata_ratio)) |
| 3891 | force_metadata_allocation(fs_info); |
| 3892 | } |
| 3893 | |
Liu Bo | 15d1ff8 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 3894 | /* |
| 3895 | * Check if we have enough space in SYSTEM chunk because we may need |
| 3896 | * to update devices. |
| 3897 | */ |
| 3898 | check_system_chunk(trans, extent_root, flags); |
| 3899 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3900 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
Josef Bacik | c6b305a | 2012-12-18 09:16:16 -0500 | [diff] [blame] | 3901 | trans->allocating_chunk = false; |
Mark Fasheh | 92b8e897 | 2011-07-12 10:57:59 -0700 | [diff] [blame] | 3902 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3903 | spin_lock(&space_info->lock); |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 3904 | if (ret < 0 && ret != -ENOSPC) |
| 3905 | goto out; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3906 | if (ret) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3907 | space_info->full = 1; |
Yan, Zheng | 424499d | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 3908 | else |
| 3909 | ret = 1; |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3910 | |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 3911 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
Alexandre Oliva | a81cb9a | 2013-02-21 21:15:14 +0000 | [diff] [blame] | 3912 | out: |
Josef Bacik | 6d74119 | 2011-04-11 20:20:11 -0400 | [diff] [blame] | 3913 | space_info->chunk_alloc = 0; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3914 | spin_unlock(&space_info->lock); |
Dan Carpenter | a25c75d | 2012-04-18 09:59:29 +0300 | [diff] [blame] | 3915 | mutex_unlock(&fs_info->chunk_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3916 | return ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3917 | } |
| 3918 | |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3919 | static int can_overcommit(struct btrfs_root *root, |
| 3920 | struct btrfs_space_info *space_info, u64 bytes, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 3921 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3922 | { |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 3923 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3924 | u64 profile = btrfs_get_alloc_profile(root, 0); |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3925 | u64 space_size; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3926 | u64 avail; |
| 3927 | u64 used; |
Josef Bacik | 70afa39 | 2013-02-06 13:53:19 -0500 | [diff] [blame] | 3928 | u64 to_add; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3929 | |
| 3930 | used = space_info->bytes_used + space_info->bytes_reserved + |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 3931 | space_info->bytes_pinned + space_info->bytes_readonly; |
| 3932 | |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 3933 | /* |
| 3934 | * We only want to allow over committing if we have lots of actual space |
| 3935 | * free, but if we don't have enough space to handle the global reserve |
| 3936 | * space then we could end up having a real enospc problem when trying |
| 3937 | * to allocate a chunk or some other such important allocation. |
| 3938 | */ |
Miao Xie | 3c76cd8 | 2013-04-25 10:12:38 +0000 | [diff] [blame] | 3939 | spin_lock(&global_rsv->lock); |
| 3940 | space_size = calc_global_rsv_need_space(global_rsv); |
| 3941 | spin_unlock(&global_rsv->lock); |
| 3942 | if (used + space_size >= space_info->total_bytes) |
Josef Bacik | 96f1bb5 | 2013-01-30 17:02:51 -0500 | [diff] [blame] | 3943 | return 0; |
| 3944 | |
| 3945 | used += space_info->bytes_may_use; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3946 | |
| 3947 | spin_lock(&root->fs_info->free_chunk_lock); |
| 3948 | avail = root->fs_info->free_chunk_space; |
| 3949 | spin_unlock(&root->fs_info->free_chunk_lock); |
| 3950 | |
| 3951 | /* |
| 3952 | * 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] | 3953 | * space is actually useable. For raid56, the space info used |
| 3954 | * doesn't include the parity drive, so we don't have to |
| 3955 | * change the math |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3956 | */ |
| 3957 | if (profile & (BTRFS_BLOCK_GROUP_DUP | |
| 3958 | BTRFS_BLOCK_GROUP_RAID1 | |
| 3959 | BTRFS_BLOCK_GROUP_RAID10)) |
| 3960 | avail >>= 1; |
| 3961 | |
Josef Bacik | 70afa39 | 2013-02-06 13:53:19 -0500 | [diff] [blame] | 3962 | to_add = space_info->total_bytes; |
| 3963 | |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3964 | /* |
Miao Xie | 561c294 | 2012-10-16 11:32:18 +0000 | [diff] [blame] | 3965 | * If we aren't flushing all things, let us overcommit up to |
| 3966 | * 1/2th of the space. If we can flush, don't let us overcommit |
| 3967 | * too much, let it overcommit up to 1/8 of the space. |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3968 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 3969 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
Josef Bacik | 70afa39 | 2013-02-06 13:53:19 -0500 | [diff] [blame] | 3970 | to_add >>= 3; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3971 | else |
Josef Bacik | 70afa39 | 2013-02-06 13:53:19 -0500 | [diff] [blame] | 3972 | to_add >>= 1; |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3973 | |
Josef Bacik | 70afa39 | 2013-02-06 13:53:19 -0500 | [diff] [blame] | 3974 | /* |
| 3975 | * Limit the overcommit to the amount of free space we could possibly |
| 3976 | * allocate for chunks. |
| 3977 | */ |
| 3978 | to_add = min(avail, to_add); |
| 3979 | |
| 3980 | if (used + bytes < space_info->total_bytes + to_add) |
Josef Bacik | a80c8dc | 2012-09-06 16:59:33 -0400 | [diff] [blame] | 3981 | return 1; |
| 3982 | return 0; |
| 3983 | } |
| 3984 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 3985 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
| 3986 | unsigned long nr_pages) |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 3987 | { |
| 3988 | struct super_block *sb = root->fs_info->sb; |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 3989 | |
Josef Bacik | 925a6ef | 2013-06-20 12:31:27 -0400 | [diff] [blame] | 3990 | if (down_read_trylock(&sb->s_umount)) { |
| 3991 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); |
| 3992 | up_read(&sb->s_umount); |
| 3993 | } else { |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 3994 | /* |
| 3995 | * We needn't worry the filesystem going from r/w to r/o though |
| 3996 | * we don't acquire ->s_umount mutex, because the filesystem |
| 3997 | * should guarantee the delalloc inodes list be empty after |
| 3998 | * the filesystem is readonly(all dirty pages are written to |
| 3999 | * the disk). |
| 4000 | */ |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 4001 | btrfs_start_all_delalloc_inodes(root->fs_info, 0); |
Josef Bacik | 98ad69c | 2013-04-04 11:55:49 -0400 | [diff] [blame] | 4002 | if (!current->journal_info) |
Miao Xie | 199c2a9 | 2013-05-15 07:48:23 +0000 | [diff] [blame] | 4003 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4004 | } |
| 4005 | } |
| 4006 | |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4007 | /* |
| 4008 | * shrink metadata reservation for delalloc |
| 4009 | */ |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4010 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
| 4011 | bool wait_ordered) |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4012 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4013 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4014 | struct btrfs_space_info *space_info; |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4015 | struct btrfs_trans_handle *trans; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4016 | u64 delalloc_bytes; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4017 | u64 max_reclaim; |
Josef Bacik | b1953bc | 2011-01-21 21:10:01 +0000 | [diff] [blame] | 4018 | long time_left; |
Josef Bacik | 877da17 | 2011-10-14 14:02:10 -0400 | [diff] [blame] | 4019 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
Josef Bacik | b1953bc | 2011-01-21 21:10:01 +0000 | [diff] [blame] | 4020 | int loops = 0; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4021 | enum btrfs_reserve_flush_enum flush; |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4022 | |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4023 | trans = (struct btrfs_trans_handle *)current->journal_info; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4024 | block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4025 | space_info = block_rsv->space_info; |
Chris Mason | bf9022e | 2010-10-26 13:40:45 -0400 | [diff] [blame] | 4026 | |
| 4027 | smp_mb(); |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4028 | delalloc_bytes = percpu_counter_sum_positive( |
| 4029 | &root->fs_info->delalloc_bytes); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4030 | if (delalloc_bytes == 0) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4031 | if (trans) |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4032 | return; |
Miao Xie | 199c2a9 | 2013-05-15 07:48:23 +0000 | [diff] [blame] | 4033 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4034 | return; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4035 | } |
| 4036 | |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4037 | while (delalloc_bytes && loops < 3) { |
| 4038 | max_reclaim = min(delalloc_bytes, to_reclaim); |
| 4039 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; |
Miao Xie | da633a4 | 2012-12-20 11:19:09 +0000 | [diff] [blame] | 4040 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
Josef Bacik | dea31f5 | 2012-09-06 16:47:00 -0400 | [diff] [blame] | 4041 | /* |
| 4042 | * We need to wait for the async pages to actually start before |
| 4043 | * we do anything. |
| 4044 | */ |
| 4045 | wait_event(root->fs_info->async_submit_wait, |
| 4046 | !atomic_read(&root->fs_info->async_delalloc_pages)); |
| 4047 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4048 | if (!trans) |
| 4049 | flush = BTRFS_RESERVE_FLUSH_ALL; |
| 4050 | else |
| 4051 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4052 | spin_lock(&space_info->lock); |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4053 | if (can_overcommit(root, space_info, orig, flush)) { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4054 | spin_unlock(&space_info->lock); |
| 4055 | break; |
| 4056 | } |
Josef Bacik | 0019f10 | 2010-10-15 15:18:40 -0400 | [diff] [blame] | 4057 | spin_unlock(&space_info->lock); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4058 | |
Chris Mason | 36e39c4 | 2011-03-12 07:08:42 -0500 | [diff] [blame] | 4059 | loops++; |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4060 | if (wait_ordered && !trans) { |
Miao Xie | 199c2a9 | 2013-05-15 07:48:23 +0000 | [diff] [blame] | 4061 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4062 | } else { |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4063 | time_left = schedule_timeout_killable(1); |
Josef Bacik | f104d04 | 2011-10-14 13:56:58 -0400 | [diff] [blame] | 4064 | if (time_left) |
| 4065 | break; |
| 4066 | } |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4067 | smp_mb(); |
Miao Xie | 963d678 | 2013-01-29 10:10:51 +0000 | [diff] [blame] | 4068 | delalloc_bytes = percpu_counter_sum_positive( |
| 4069 | &root->fs_info->delalloc_bytes); |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4070 | } |
Yan, Zheng | 5da9d01 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4071 | } |
| 4072 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4073 | /** |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4074 | * maybe_commit_transaction - possibly commit the transaction if its ok to |
| 4075 | * @root - the root we're allocating for |
| 4076 | * @bytes - the number of bytes we want to reserve |
| 4077 | * @force - force the commit |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4078 | * |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4079 | * This will check to make sure that committing the transaction will actually |
| 4080 | * get us somewhere and then commit the transaction if it does. Otherwise it |
| 4081 | * will return -ENOSPC. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4082 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4083 | static int may_commit_transaction(struct btrfs_root *root, |
| 4084 | struct btrfs_space_info *space_info, |
| 4085 | u64 bytes, int force) |
| 4086 | { |
| 4087 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; |
| 4088 | struct btrfs_trans_handle *trans; |
| 4089 | |
| 4090 | trans = (struct btrfs_trans_handle *)current->journal_info; |
| 4091 | if (trans) |
| 4092 | return -EAGAIN; |
| 4093 | |
| 4094 | if (force) |
| 4095 | goto commit; |
| 4096 | |
| 4097 | /* See if there is enough pinned space to make this reservation */ |
| 4098 | spin_lock(&space_info->lock); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4099 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
| 4100 | bytes) >= 0) { |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4101 | spin_unlock(&space_info->lock); |
| 4102 | goto commit; |
| 4103 | } |
| 4104 | spin_unlock(&space_info->lock); |
| 4105 | |
| 4106 | /* |
| 4107 | * See if there is some space in the delayed insertion reservation for |
| 4108 | * this reservation. |
| 4109 | */ |
| 4110 | if (space_info != delayed_rsv->space_info) |
| 4111 | return -ENOSPC; |
| 4112 | |
Liu Bo | d9b0218 | 2012-02-16 18:34:39 +0800 | [diff] [blame] | 4113 | spin_lock(&space_info->lock); |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4114 | spin_lock(&delayed_rsv->lock); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 4115 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
| 4116 | bytes - delayed_rsv->size) >= 0) { |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4117 | spin_unlock(&delayed_rsv->lock); |
Liu Bo | d9b0218 | 2012-02-16 18:34:39 +0800 | [diff] [blame] | 4118 | spin_unlock(&space_info->lock); |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4119 | return -ENOSPC; |
| 4120 | } |
| 4121 | spin_unlock(&delayed_rsv->lock); |
Liu Bo | d9b0218 | 2012-02-16 18:34:39 +0800 | [diff] [blame] | 4122 | spin_unlock(&space_info->lock); |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4123 | |
| 4124 | commit: |
| 4125 | trans = btrfs_join_transaction(root); |
| 4126 | if (IS_ERR(trans)) |
| 4127 | return -ENOSPC; |
| 4128 | |
| 4129 | return btrfs_commit_transaction(trans, root); |
| 4130 | } |
| 4131 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4132 | enum flush_state { |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4133 | FLUSH_DELAYED_ITEMS_NR = 1, |
| 4134 | FLUSH_DELAYED_ITEMS = 2, |
| 4135 | FLUSH_DELALLOC = 3, |
| 4136 | FLUSH_DELALLOC_WAIT = 4, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4137 | ALLOC_CHUNK = 5, |
| 4138 | COMMIT_TRANS = 6, |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4139 | }; |
| 4140 | |
| 4141 | static int flush_space(struct btrfs_root *root, |
| 4142 | struct btrfs_space_info *space_info, u64 num_bytes, |
| 4143 | u64 orig_bytes, int state) |
| 4144 | { |
| 4145 | struct btrfs_trans_handle *trans; |
| 4146 | int nr; |
Josef Bacik | f4c738c | 2012-07-02 17:10:51 -0400 | [diff] [blame] | 4147 | int ret = 0; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4148 | |
| 4149 | switch (state) { |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4150 | case FLUSH_DELAYED_ITEMS_NR: |
| 4151 | case FLUSH_DELAYED_ITEMS: |
| 4152 | if (state == FLUSH_DELAYED_ITEMS_NR) { |
| 4153 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); |
| 4154 | |
| 4155 | nr = (int)div64_u64(num_bytes, bytes); |
| 4156 | if (!nr) |
| 4157 | nr = 1; |
| 4158 | nr *= 2; |
| 4159 | } else { |
| 4160 | nr = -1; |
| 4161 | } |
| 4162 | trans = btrfs_join_transaction(root); |
| 4163 | if (IS_ERR(trans)) { |
| 4164 | ret = PTR_ERR(trans); |
| 4165 | break; |
| 4166 | } |
| 4167 | ret = btrfs_run_delayed_items_nr(trans, root, nr); |
| 4168 | btrfs_end_transaction(trans, root); |
| 4169 | break; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4170 | case FLUSH_DELALLOC: |
| 4171 | case FLUSH_DELALLOC_WAIT: |
| 4172 | shrink_delalloc(root, num_bytes, orig_bytes, |
| 4173 | state == FLUSH_DELALLOC_WAIT); |
| 4174 | break; |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4175 | case ALLOC_CHUNK: |
| 4176 | trans = btrfs_join_transaction(root); |
| 4177 | if (IS_ERR(trans)) { |
| 4178 | ret = PTR_ERR(trans); |
| 4179 | break; |
| 4180 | } |
| 4181 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 4182 | btrfs_get_alloc_profile(root, 0), |
| 4183 | CHUNK_ALLOC_NO_FORCE); |
| 4184 | btrfs_end_transaction(trans, root); |
| 4185 | if (ret == -ENOSPC) |
| 4186 | ret = 0; |
| 4187 | break; |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4188 | case COMMIT_TRANS: |
| 4189 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); |
| 4190 | break; |
| 4191 | default: |
| 4192 | ret = -ENOSPC; |
| 4193 | break; |
| 4194 | } |
| 4195 | |
| 4196 | return ret; |
| 4197 | } |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4198 | /** |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4199 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space |
| 4200 | * @root - the root we're allocating for |
| 4201 | * @block_rsv - the block_rsv we're allocating for |
| 4202 | * @orig_bytes - the number of bytes we want |
Adam Buchbinder | 48fc7f7 | 2012-09-19 21:48:00 -0400 | [diff] [blame] | 4203 | * @flush - whether or not we can flush to make our reservation |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4204 | * |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4205 | * This will reserve orgi_bytes number of bytes from the space info associated |
| 4206 | * with the block_rsv. If there is not enough space it will make an attempt to |
| 4207 | * flush out space to make room. It will do this by flushing delalloc if |
| 4208 | * possible or committing the transaction. If flush is 0 then no attempts to |
| 4209 | * regain reservations will be made and this will fail if there is not enough |
| 4210 | * space already. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4211 | */ |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4212 | static int reserve_metadata_bytes(struct btrfs_root *root, |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4213 | struct btrfs_block_rsv *block_rsv, |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4214 | u64 orig_bytes, |
| 4215 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4216 | { |
| 4217 | struct btrfs_space_info *space_info = block_rsv->space_info; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4218 | u64 used; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4219 | u64 num_bytes = orig_bytes; |
Josef Bacik | 67b0fd6 | 2012-09-24 13:42:00 -0400 | [diff] [blame] | 4220 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4221 | int ret = 0; |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4222 | bool flushing = false; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4223 | |
| 4224 | again: |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4225 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4226 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4227 | /* |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4228 | * We only want to wait if somebody other than us is flushing and we |
| 4229 | * are actually allowed to flush all things. |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4230 | */ |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4231 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
| 4232 | space_info->flush) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4233 | spin_unlock(&space_info->lock); |
| 4234 | /* |
| 4235 | * If we have a trans handle we can't wait because the flusher |
| 4236 | * may have to commit the transaction, which would mean we would |
| 4237 | * deadlock since we are waiting for the flusher to finish, but |
| 4238 | * hold the current transaction open. |
| 4239 | */ |
Josef Bacik | 663350a | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4240 | if (current->journal_info) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4241 | return -EAGAIN; |
Arne Jansen | b9688bb | 2012-04-18 10:27:16 +0200 | [diff] [blame] | 4242 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
| 4243 | /* Must have been killed, return */ |
| 4244 | if (ret) |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4245 | return -EINTR; |
| 4246 | |
| 4247 | spin_lock(&space_info->lock); |
| 4248 | } |
| 4249 | |
| 4250 | ret = -ENOSPC; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4251 | used = space_info->bytes_used + space_info->bytes_reserved + |
| 4252 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 4253 | space_info->bytes_may_use; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4254 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4255 | /* |
| 4256 | * The idea here is that we've not already over-reserved the block group |
| 4257 | * then we can go ahead and save our reservation first and then start |
| 4258 | * flushing if we need to. Otherwise if we've already overcommitted |
| 4259 | * lets start flushing stuff first and then come back and try to make |
| 4260 | * our reservation. |
| 4261 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4262 | if (used <= space_info->total_bytes) { |
| 4263 | if (used + orig_bytes <= space_info->total_bytes) { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4264 | space_info->bytes_may_use += orig_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4265 | trace_btrfs_space_reservation(root->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4266 | "space_info", space_info->flags, orig_bytes, 1); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4267 | ret = 0; |
| 4268 | } else { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4269 | /* |
| 4270 | * Ok set num_bytes to orig_bytes since we aren't |
| 4271 | * overocmmitted, this way we only try and reclaim what |
| 4272 | * we need. |
| 4273 | */ |
| 4274 | num_bytes = orig_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4275 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4276 | } else { |
| 4277 | /* |
| 4278 | * Ok we're over committed, set num_bytes to the overcommitted |
| 4279 | * amount plus the amount of bytes that we need for this |
| 4280 | * reservation. |
| 4281 | */ |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4282 | num_bytes = used - space_info->total_bytes + |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4283 | (orig_bytes * 2); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4284 | } |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4285 | |
Josef Bacik | 44734ed | 2012-09-28 16:04:19 -0400 | [diff] [blame] | 4286 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
| 4287 | space_info->bytes_may_use += orig_bytes; |
| 4288 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
| 4289 | space_info->flags, orig_bytes, |
| 4290 | 1); |
| 4291 | ret = 0; |
Josef Bacik | 2bf6475 | 2011-09-26 17:12:22 -0400 | [diff] [blame] | 4292 | } |
| 4293 | |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4294 | /* |
| 4295 | * Couldn't make our reservation, save our place so while we're trying |
| 4296 | * to reclaim space we can actually use it instead of somebody else |
| 4297 | * stealing it from us. |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4298 | * |
| 4299 | * We make the other tasks wait for the flush only when we can flush |
| 4300 | * all things. |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4301 | */ |
Josef Bacik | 72bcd99 | 2012-12-18 15:16:34 -0500 | [diff] [blame] | 4302 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4303 | flushing = true; |
| 4304 | space_info->flush = 1; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4305 | } |
| 4306 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4307 | spin_unlock(&space_info->lock); |
| 4308 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4309 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4310 | goto out; |
| 4311 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4312 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
| 4313 | flush_state); |
| 4314 | flush_state++; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4315 | |
| 4316 | /* |
| 4317 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock |
| 4318 | * would happen. So skip delalloc flush. |
| 4319 | */ |
| 4320 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4321 | (flush_state == FLUSH_DELALLOC || |
| 4322 | flush_state == FLUSH_DELALLOC_WAIT)) |
| 4323 | flush_state = ALLOC_CHUNK; |
| 4324 | |
Josef Bacik | 96c3f43 | 2012-06-21 14:05:49 -0400 | [diff] [blame] | 4325 | if (!ret) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4326 | goto again; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4327 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
| 4328 | flush_state < COMMIT_TRANS) |
| 4329 | goto again; |
| 4330 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && |
| 4331 | flush_state <= COMMIT_TRANS) |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4332 | goto again; |
| 4333 | |
| 4334 | out: |
Josef Bacik | 5d80366 | 2013-02-07 16:06:02 -0500 | [diff] [blame] | 4335 | if (ret == -ENOSPC && |
| 4336 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { |
| 4337 | struct btrfs_block_rsv *global_rsv = |
| 4338 | &root->fs_info->global_block_rsv; |
| 4339 | |
| 4340 | if (block_rsv != global_rsv && |
| 4341 | !block_rsv_use_bytes(global_rsv, orig_bytes)) |
| 4342 | ret = 0; |
| 4343 | } |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4344 | if (flushing) { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4345 | spin_lock(&space_info->lock); |
Josef Bacik | fdb5eff | 2011-06-07 16:07:44 -0400 | [diff] [blame] | 4346 | space_info->flush = 0; |
| 4347 | wake_up_all(&space_info->wait); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4348 | spin_unlock(&space_info->lock); |
| 4349 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4350 | return ret; |
| 4351 | } |
| 4352 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4353 | static struct btrfs_block_rsv *get_block_rsv( |
| 4354 | const struct btrfs_trans_handle *trans, |
| 4355 | const struct btrfs_root *root) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4356 | { |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4357 | struct btrfs_block_rsv *block_rsv = NULL; |
| 4358 | |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 4359 | if (root->ref_cows) |
| 4360 | block_rsv = trans->block_rsv; |
| 4361 | |
| 4362 | if (root == root->fs_info->csum_root && trans->adding_csums) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4363 | block_rsv = trans->block_rsv; |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4364 | |
Stefan Behrens | f7a81ea | 2013-08-15 17:11:19 +0200 | [diff] [blame] | 4365 | if (root == root->fs_info->uuid_root) |
| 4366 | block_rsv = trans->block_rsv; |
| 4367 | |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 4368 | if (!block_rsv) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4369 | block_rsv = root->block_rsv; |
| 4370 | |
| 4371 | if (!block_rsv) |
| 4372 | block_rsv = &root->fs_info->empty_block_rsv; |
| 4373 | |
| 4374 | return block_rsv; |
| 4375 | } |
| 4376 | |
| 4377 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
| 4378 | u64 num_bytes) |
| 4379 | { |
| 4380 | int ret = -ENOSPC; |
| 4381 | spin_lock(&block_rsv->lock); |
| 4382 | if (block_rsv->reserved >= num_bytes) { |
| 4383 | block_rsv->reserved -= num_bytes; |
| 4384 | if (block_rsv->reserved < block_rsv->size) |
| 4385 | block_rsv->full = 0; |
| 4386 | ret = 0; |
| 4387 | } |
| 4388 | spin_unlock(&block_rsv->lock); |
| 4389 | return ret; |
| 4390 | } |
| 4391 | |
| 4392 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, |
| 4393 | u64 num_bytes, int update_size) |
| 4394 | { |
| 4395 | spin_lock(&block_rsv->lock); |
| 4396 | block_rsv->reserved += num_bytes; |
| 4397 | if (update_size) |
| 4398 | block_rsv->size += num_bytes; |
| 4399 | else if (block_rsv->reserved >= block_rsv->size) |
| 4400 | block_rsv->full = 1; |
| 4401 | spin_unlock(&block_rsv->lock); |
| 4402 | } |
| 4403 | |
Josef Bacik | d52be81 | 2013-05-29 14:54:47 -0400 | [diff] [blame] | 4404 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
| 4405 | struct btrfs_block_rsv *dest, u64 num_bytes, |
| 4406 | int min_factor) |
| 4407 | { |
| 4408 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
| 4409 | u64 min_bytes; |
| 4410 | |
| 4411 | if (global_rsv->space_info != dest->space_info) |
| 4412 | return -ENOSPC; |
| 4413 | |
| 4414 | spin_lock(&global_rsv->lock); |
| 4415 | min_bytes = div_factor(global_rsv->size, min_factor); |
| 4416 | if (global_rsv->reserved < min_bytes + num_bytes) { |
| 4417 | spin_unlock(&global_rsv->lock); |
| 4418 | return -ENOSPC; |
| 4419 | } |
| 4420 | global_rsv->reserved -= num_bytes; |
| 4421 | if (global_rsv->reserved < global_rsv->size) |
| 4422 | global_rsv->full = 0; |
| 4423 | spin_unlock(&global_rsv->lock); |
| 4424 | |
| 4425 | block_rsv_add_bytes(dest, num_bytes, 1); |
| 4426 | return 0; |
| 4427 | } |
| 4428 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4429 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
| 4430 | struct btrfs_block_rsv *block_rsv, |
David Sterba | 62a45b6 | 2011-04-20 15:52:26 +0200 | [diff] [blame] | 4431 | struct btrfs_block_rsv *dest, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4432 | { |
| 4433 | struct btrfs_space_info *space_info = block_rsv->space_info; |
| 4434 | |
| 4435 | spin_lock(&block_rsv->lock); |
| 4436 | if (num_bytes == (u64)-1) |
| 4437 | num_bytes = block_rsv->size; |
| 4438 | block_rsv->size -= num_bytes; |
| 4439 | if (block_rsv->reserved >= block_rsv->size) { |
| 4440 | num_bytes = block_rsv->reserved - block_rsv->size; |
| 4441 | block_rsv->reserved = block_rsv->size; |
| 4442 | block_rsv->full = 1; |
| 4443 | } else { |
| 4444 | num_bytes = 0; |
| 4445 | } |
| 4446 | spin_unlock(&block_rsv->lock); |
| 4447 | |
| 4448 | if (num_bytes > 0) { |
| 4449 | if (dest) { |
Josef Bacik | e9e2289 | 2011-01-24 21:43:19 +0000 | [diff] [blame] | 4450 | spin_lock(&dest->lock); |
| 4451 | if (!dest->full) { |
| 4452 | u64 bytes_to_add; |
| 4453 | |
| 4454 | bytes_to_add = dest->size - dest->reserved; |
| 4455 | bytes_to_add = min(num_bytes, bytes_to_add); |
| 4456 | dest->reserved += bytes_to_add; |
| 4457 | if (dest->reserved >= dest->size) |
| 4458 | dest->full = 1; |
| 4459 | num_bytes -= bytes_to_add; |
| 4460 | } |
| 4461 | spin_unlock(&dest->lock); |
| 4462 | } |
| 4463 | if (num_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4464 | spin_lock(&space_info->lock); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4465 | space_info->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4466 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4467 | space_info->flags, num_bytes, 0); |
Chris Mason | 36e39c4 | 2011-03-12 07:08:42 -0500 | [diff] [blame] | 4468 | space_info->reservation_progress++; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4469 | spin_unlock(&space_info->lock); |
| 4470 | } |
| 4471 | } |
| 4472 | } |
| 4473 | |
| 4474 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
| 4475 | struct btrfs_block_rsv *dst, u64 num_bytes) |
| 4476 | { |
| 4477 | int ret; |
| 4478 | |
| 4479 | ret = block_rsv_use_bytes(src, num_bytes); |
| 4480 | if (ret) |
| 4481 | return ret; |
| 4482 | |
| 4483 | block_rsv_add_bytes(dst, num_bytes, 1); |
| 4484 | return 0; |
| 4485 | } |
| 4486 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4487 | 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] | 4488 | { |
| 4489 | memset(rsv, 0, sizeof(*rsv)); |
| 4490 | spin_lock_init(&rsv->lock); |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4491 | rsv->type = type; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4492 | } |
| 4493 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4494 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
| 4495 | unsigned short type) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4496 | { |
| 4497 | struct btrfs_block_rsv *block_rsv; |
| 4498 | struct btrfs_fs_info *fs_info = root->fs_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4499 | |
| 4500 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
| 4501 | if (!block_rsv) |
| 4502 | return NULL; |
| 4503 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 4504 | btrfs_init_block_rsv(block_rsv, type); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4505 | block_rsv->space_info = __find_space_info(fs_info, |
| 4506 | BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4507 | return block_rsv; |
| 4508 | } |
| 4509 | |
| 4510 | void btrfs_free_block_rsv(struct btrfs_root *root, |
| 4511 | struct btrfs_block_rsv *rsv) |
| 4512 | { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 4513 | if (!rsv) |
| 4514 | return; |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 4515 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
| 4516 | kfree(rsv); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4517 | } |
| 4518 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4519 | int btrfs_block_rsv_add(struct btrfs_root *root, |
| 4520 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, |
| 4521 | enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4522 | { |
| 4523 | int ret; |
| 4524 | |
| 4525 | if (num_bytes == 0) |
| 4526 | return 0; |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4527 | |
Miao Xie | 61b520a | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 4528 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4529 | if (!ret) { |
| 4530 | block_rsv_add_bytes(block_rsv, num_bytes, 1); |
| 4531 | return 0; |
| 4532 | } |
| 4533 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4534 | return ret; |
| 4535 | } |
| 4536 | |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 4537 | int btrfs_block_rsv_check(struct btrfs_root *root, |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4538 | struct btrfs_block_rsv *block_rsv, int min_factor) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4539 | { |
| 4540 | u64 num_bytes = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4541 | int ret = -ENOSPC; |
| 4542 | |
| 4543 | if (!block_rsv) |
| 4544 | return 0; |
| 4545 | |
| 4546 | spin_lock(&block_rsv->lock); |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4547 | num_bytes = div_factor(block_rsv->size, min_factor); |
| 4548 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4549 | ret = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4550 | spin_unlock(&block_rsv->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4551 | |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4552 | return ret; |
| 4553 | } |
| 4554 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4555 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
| 4556 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, |
| 4557 | enum btrfs_reserve_flush_enum flush) |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 4558 | { |
| 4559 | u64 num_bytes = 0; |
| 4560 | int ret = -ENOSPC; |
| 4561 | |
| 4562 | if (!block_rsv) |
| 4563 | return 0; |
| 4564 | |
| 4565 | spin_lock(&block_rsv->lock); |
| 4566 | num_bytes = min_reserved; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4567 | if (block_rsv->reserved >= num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4568 | ret = 0; |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4569 | else |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4570 | num_bytes -= block_rsv->reserved; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4571 | spin_unlock(&block_rsv->lock); |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4572 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4573 | if (!ret) |
| 4574 | return 0; |
| 4575 | |
Miao Xie | aa38a71 | 2011-11-18 17:43:00 +0800 | [diff] [blame] | 4576 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
Josef Bacik | dabdb64 | 2011-08-08 12:50:18 -0400 | [diff] [blame] | 4577 | if (!ret) { |
| 4578 | block_rsv_add_bytes(block_rsv, num_bytes, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4579 | return 0; |
| 4580 | } |
| 4581 | |
Josef Bacik | 13553e5 | 2011-08-08 13:33:21 -0400 | [diff] [blame] | 4582 | return ret; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4583 | } |
| 4584 | |
| 4585 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, |
| 4586 | struct btrfs_block_rsv *dst_rsv, |
| 4587 | u64 num_bytes) |
| 4588 | { |
| 4589 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 4590 | } |
| 4591 | |
| 4592 | void btrfs_block_rsv_release(struct btrfs_root *root, |
| 4593 | struct btrfs_block_rsv *block_rsv, |
| 4594 | u64 num_bytes) |
| 4595 | { |
| 4596 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
| 4597 | if (global_rsv->full || global_rsv == block_rsv || |
| 4598 | block_rsv->space_info != global_rsv->space_info) |
| 4599 | global_rsv = NULL; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4600 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
| 4601 | num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4602 | } |
| 4603 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4604 | /* |
| 4605 | * helper to calculate size of global block reservation. |
| 4606 | * the desired value is sum of space used by extent tree, |
| 4607 | * checksum tree and root tree |
| 4608 | */ |
| 4609 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
| 4610 | { |
| 4611 | struct btrfs_space_info *sinfo; |
| 4612 | u64 num_bytes; |
| 4613 | u64 meta_used; |
| 4614 | u64 data_used; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 4615 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4616 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4617 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
| 4618 | spin_lock(&sinfo->lock); |
| 4619 | data_used = sinfo->bytes_used; |
| 4620 | spin_unlock(&sinfo->lock); |
| 4621 | |
| 4622 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
| 4623 | spin_lock(&sinfo->lock); |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 4624 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
| 4625 | data_used = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4626 | meta_used = sinfo->bytes_used; |
| 4627 | spin_unlock(&sinfo->lock); |
| 4628 | |
| 4629 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
| 4630 | csum_size * 2; |
| 4631 | num_bytes += div64_u64(data_used + meta_used, 50); |
| 4632 | |
| 4633 | if (num_bytes * 3 > meta_used) |
Chris Mason | 8e62c2d | 2012-04-12 13:46:48 -0400 | [diff] [blame] | 4634 | num_bytes = div64_u64(meta_used, 3); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4635 | |
| 4636 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
| 4637 | } |
| 4638 | |
| 4639 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4640 | { |
| 4641 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| 4642 | struct btrfs_space_info *sinfo = block_rsv->space_info; |
| 4643 | u64 num_bytes; |
| 4644 | |
| 4645 | num_bytes = calc_global_metadata_size(fs_info); |
| 4646 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4647 | spin_lock(&sinfo->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 4648 | spin_lock(&block_rsv->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4649 | |
Josef Bacik | fdf30d1 | 2013-03-26 15:31:45 -0400 | [diff] [blame] | 4650 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4651 | |
| 4652 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
Josef Bacik | 6d48755 | 2010-10-15 15:13:32 -0400 | [diff] [blame] | 4653 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
| 4654 | sinfo->bytes_may_use; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4655 | |
| 4656 | if (sinfo->total_bytes > num_bytes) { |
| 4657 | num_bytes = sinfo->total_bytes - num_bytes; |
| 4658 | block_rsv->reserved += num_bytes; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4659 | sinfo->bytes_may_use += num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4660 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4661 | sinfo->flags, num_bytes, 1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4662 | } |
| 4663 | |
| 4664 | if (block_rsv->reserved >= block_rsv->size) { |
| 4665 | num_bytes = block_rsv->reserved - block_rsv->size; |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 4666 | sinfo->bytes_may_use -= num_bytes; |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4667 | trace_btrfs_space_reservation(fs_info, "space_info", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4668 | sinfo->flags, num_bytes, 0); |
Chris Mason | 36e39c4 | 2011-03-12 07:08:42 -0500 | [diff] [blame] | 4669 | sinfo->reservation_progress++; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4670 | block_rsv->reserved = block_rsv->size; |
| 4671 | block_rsv->full = 1; |
| 4672 | } |
David Sterba | 182608c | 2011-05-05 13:13:16 +0200 | [diff] [blame] | 4673 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4674 | spin_unlock(&block_rsv->lock); |
Stefan Behrens | 1f699d3 | 2012-04-27 12:41:46 -0400 | [diff] [blame] | 4675 | spin_unlock(&sinfo->lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4676 | } |
| 4677 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4678 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4679 | { |
| 4680 | struct btrfs_space_info *space_info; |
| 4681 | |
| 4682 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
| 4683 | fs_info->chunk_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4684 | |
| 4685 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4686 | fs_info->global_block_rsv.space_info = space_info; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4687 | fs_info->delalloc_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4688 | fs_info->trans_block_rsv.space_info = space_info; |
| 4689 | fs_info->empty_block_rsv.space_info = space_info; |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4690 | fs_info->delayed_block_rsv.space_info = space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4691 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4692 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
| 4693 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; |
| 4694 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; |
| 4695 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; |
Stefan Behrens | 3a6cad9 | 2013-05-16 14:48:19 +0000 | [diff] [blame] | 4696 | if (fs_info->quota_root) |
| 4697 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4698 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4699 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4700 | update_global_block_rsv(fs_info); |
| 4701 | } |
| 4702 | |
| 4703 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
| 4704 | { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4705 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
| 4706 | (u64)-1); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4707 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
| 4708 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); |
| 4709 | WARN_ON(fs_info->trans_block_rsv.size > 0); |
| 4710 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); |
| 4711 | WARN_ON(fs_info->chunk_block_rsv.size > 0); |
| 4712 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); |
Josef Bacik | 6d668dd | 2011-11-03 22:54:25 -0400 | [diff] [blame] | 4713 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
| 4714 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 4715 | } |
| 4716 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4717 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
| 4718 | struct btrfs_root *root) |
| 4719 | { |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 4720 | if (!trans->block_rsv) |
| 4721 | return; |
| 4722 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4723 | if (!trans->bytes_reserved) |
| 4724 | return; |
| 4725 | |
Chris Mason | e77266e | 2012-02-24 10:39:05 -0500 | [diff] [blame] | 4726 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 4727 | trans->transid, trans->bytes_reserved, 0); |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 4728 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4729 | trans->bytes_reserved = 0; |
| 4730 | } |
| 4731 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4732 | /* Can only return 0 or -ENOSPC */ |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4733 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
| 4734 | struct inode *inode) |
| 4735 | { |
| 4736 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4737 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); |
| 4738 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; |
| 4739 | |
| 4740 | /* |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 4741 | * We need to hold space in order to delete our orphan item once we've |
| 4742 | * added it, so this takes the reservation so we can release it later |
| 4743 | * when we are truly done with the orphan item. |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4744 | */ |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4745 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4746 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 4747 | btrfs_ino(inode), num_bytes, 1); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4748 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
| 4749 | } |
| 4750 | |
| 4751 | void btrfs_orphan_release_metadata(struct inode *inode) |
| 4752 | { |
| 4753 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4754 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4755 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
| 4756 | btrfs_ino(inode), num_bytes, 0); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4757 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
| 4758 | } |
| 4759 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4760 | /* |
| 4761 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation |
| 4762 | * root: the root of the parent directory |
| 4763 | * rsv: block reservation |
| 4764 | * items: the number of items that we need do reservation |
| 4765 | * qgroup_reserved: used to return the reserved size in qgroup |
| 4766 | * |
| 4767 | * This function is used to reserve the space for snapshot/subvolume |
| 4768 | * creation and deletion. Those operations are different with the |
| 4769 | * common file/directory operations, they change two fs/file trees |
| 4770 | * and root tree, the number of items that the qgroup reserves is |
| 4771 | * different with the free space reservation. So we can not use |
| 4772 | * the space reseravtion mechanism in start_transaction(). |
| 4773 | */ |
| 4774 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, |
| 4775 | struct btrfs_block_rsv *rsv, |
| 4776 | int items, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 4777 | u64 *qgroup_reserved, |
| 4778 | bool use_global_rsv) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4779 | { |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4780 | u64 num_bytes; |
| 4781 | int ret; |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 4782 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4783 | |
| 4784 | if (root->fs_info->quota_enabled) { |
| 4785 | /* One for parent inode, two for dir entries */ |
| 4786 | num_bytes = 3 * root->leafsize; |
| 4787 | ret = btrfs_qgroup_reserve(root, num_bytes); |
| 4788 | if (ret) |
| 4789 | return ret; |
| 4790 | } else { |
| 4791 | num_bytes = 0; |
| 4792 | } |
| 4793 | |
| 4794 | *qgroup_reserved = num_bytes; |
| 4795 | |
| 4796 | num_bytes = btrfs_calc_trans_metadata_size(root, items); |
| 4797 | rsv->space_info = __find_space_info(root->fs_info, |
| 4798 | BTRFS_BLOCK_GROUP_METADATA); |
| 4799 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, |
| 4800 | BTRFS_RESERVE_FLUSH_ALL); |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 4801 | |
| 4802 | if (ret == -ENOSPC && use_global_rsv) |
| 4803 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); |
| 4804 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 4805 | if (ret) { |
| 4806 | if (*qgroup_reserved) |
| 4807 | btrfs_qgroup_free(root, *qgroup_reserved); |
| 4808 | } |
| 4809 | |
| 4810 | return ret; |
| 4811 | } |
| 4812 | |
| 4813 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, |
| 4814 | struct btrfs_block_rsv *rsv, |
| 4815 | u64 qgroup_reserved) |
| 4816 | { |
| 4817 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
| 4818 | if (qgroup_reserved) |
| 4819 | btrfs_qgroup_free(root, qgroup_reserved); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4820 | } |
| 4821 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 4822 | /** |
| 4823 | * drop_outstanding_extent - drop an outstanding extent |
| 4824 | * @inode: the inode we're dropping the extent for |
| 4825 | * |
| 4826 | * This is called when we are freeing up an outstanding extent, either called |
| 4827 | * after an error or after an extent is written. This will return the number of |
| 4828 | * reserved extents that need to be freed. This must be called with |
| 4829 | * BTRFS_I(inode)->lock held. |
| 4830 | */ |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4831 | static unsigned drop_outstanding_extent(struct inode *inode) |
| 4832 | { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4833 | unsigned drop_inode_space = 0; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4834 | unsigned dropped_extents = 0; |
| 4835 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4836 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
| 4837 | BTRFS_I(inode)->outstanding_extents--; |
| 4838 | |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4839 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4840 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 4841 | &BTRFS_I(inode)->runtime_flags)) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4842 | drop_inode_space = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4843 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4844 | /* |
| 4845 | * If we have more or the same amount of outsanding extents than we have |
| 4846 | * reserved then we need to leave the reserved extents count alone. |
| 4847 | */ |
| 4848 | if (BTRFS_I(inode)->outstanding_extents >= |
| 4849 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4850 | return drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4851 | |
| 4852 | dropped_extents = BTRFS_I(inode)->reserved_extents - |
| 4853 | BTRFS_I(inode)->outstanding_extents; |
| 4854 | BTRFS_I(inode)->reserved_extents -= dropped_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4855 | return dropped_extents + drop_inode_space; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4856 | } |
| 4857 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 4858 | /** |
| 4859 | * calc_csum_metadata_size - return the amount of metada space that must be |
| 4860 | * reserved/free'd for the given bytes. |
| 4861 | * @inode: the inode we're manipulating |
| 4862 | * @num_bytes: the number of bytes in question |
| 4863 | * @reserve: 1 if we are reserving space, 0 if we are freeing space |
| 4864 | * |
| 4865 | * This adjusts the number of csum_bytes in the inode and then returns the |
| 4866 | * correct amount of metadata that must either be reserved or freed. We |
| 4867 | * calculate how many checksums we can fit into one leaf and then divide the |
| 4868 | * number of bytes that will need to be checksumed by this value to figure out |
| 4869 | * how many checksums will be required. If we are adding bytes then the number |
| 4870 | * may go up and we will return the number of additional bytes that must be |
| 4871 | * reserved. If it is going down we will return the number of bytes that must |
| 4872 | * be freed. |
| 4873 | * |
| 4874 | * This must be called with BTRFS_I(inode)->lock held. |
| 4875 | */ |
| 4876 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, |
| 4877 | int reserve) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4878 | { |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 4879 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4880 | u64 csum_size; |
| 4881 | int num_csums_per_leaf; |
| 4882 | int num_csums; |
| 4883 | int old_csums; |
| 4884 | |
| 4885 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && |
| 4886 | BTRFS_I(inode)->csum_bytes == 0) |
| 4887 | return 0; |
| 4888 | |
| 4889 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); |
| 4890 | if (reserve) |
| 4891 | BTRFS_I(inode)->csum_bytes += num_bytes; |
| 4892 | else |
| 4893 | BTRFS_I(inode)->csum_bytes -= num_bytes; |
| 4894 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); |
| 4895 | num_csums_per_leaf = (int)div64_u64(csum_size, |
| 4896 | sizeof(struct btrfs_csum_item) + |
| 4897 | sizeof(struct btrfs_disk_key)); |
| 4898 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); |
| 4899 | num_csums = num_csums + num_csums_per_leaf - 1; |
| 4900 | num_csums = num_csums / num_csums_per_leaf; |
| 4901 | |
| 4902 | old_csums = old_csums + num_csums_per_leaf - 1; |
| 4903 | old_csums = old_csums / num_csums_per_leaf; |
| 4904 | |
| 4905 | /* No change, no need to reserve more */ |
| 4906 | if (old_csums == num_csums) |
| 4907 | return 0; |
| 4908 | |
| 4909 | if (reserve) |
| 4910 | return btrfs_calc_trans_metadata_size(root, |
| 4911 | num_csums - old_csums); |
| 4912 | |
| 4913 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4914 | } |
| 4915 | |
| 4916 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
| 4917 | { |
| 4918 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4919 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4920 | u64 to_reserve = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4921 | u64 csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4922 | unsigned nr_extents = 0; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4923 | int extra_reserve = 0; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4924 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
Jan Schmidt | eb6b88d | 2013-01-27 23:26:00 -0700 | [diff] [blame] | 4925 | int ret = 0; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 4926 | bool delalloc_lock = true; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 4927 | u64 to_free = 0; |
| 4928 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4929 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 4930 | /* If we are a free space inode we need to not flush since we will be in |
| 4931 | * the middle of a transaction commit. We also don't need the delalloc |
| 4932 | * mutex since we won't race with anybody. We need this mostly to make |
| 4933 | * lockdep shut its filthy mouth. |
| 4934 | */ |
| 4935 | if (btrfs_is_free_space_inode(inode)) { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4936 | flush = BTRFS_RESERVE_NO_FLUSH; |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 4937 | delalloc_lock = false; |
| 4938 | } |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 4939 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 4940 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
| 4941 | btrfs_transaction_in_commit(root->fs_info)) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4942 | schedule_timeout(1); |
| 4943 | |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 4944 | if (delalloc_lock) |
| 4945 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); |
| 4946 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4947 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 4948 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4949 | spin_lock(&BTRFS_I(inode)->lock); |
| 4950 | BTRFS_I(inode)->outstanding_extents++; |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 4951 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4952 | if (BTRFS_I(inode)->outstanding_extents > |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4953 | BTRFS_I(inode)->reserved_extents) |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4954 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
| 4955 | BTRFS_I(inode)->reserved_extents; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4956 | |
| 4957 | /* |
| 4958 | * Add an item to reserve for updating the inode when we complete the |
| 4959 | * delalloc io. |
| 4960 | */ |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4961 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 4962 | &BTRFS_I(inode)->runtime_flags)) { |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4963 | nr_extents++; |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4964 | extra_reserve = 1; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 4965 | } |
| 4966 | |
| 4967 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 4968 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4969 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4970 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 57a45ced | 2011-01-25 16:30:38 -0500 | [diff] [blame] | 4971 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 4972 | if (root->fs_info->quota_enabled) { |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 4973 | ret = btrfs_qgroup_reserve(root, num_bytes + |
| 4974 | nr_extents * root->leafsize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 4975 | if (ret) |
| 4976 | goto out_fail; |
Wang Shilong | a9870c0 | 2013-03-01 11:33:01 +0000 | [diff] [blame] | 4977 | } |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 4978 | |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 4979 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
| 4980 | if (unlikely(ret)) { |
| 4981 | if (root->fs_info->quota_enabled) |
Miao Xie | 4b5829a | 2012-12-05 10:53:25 +0000 | [diff] [blame] | 4982 | btrfs_qgroup_free(root, num_bytes + |
| 4983 | nr_extents * root->leafsize); |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 4984 | goto out_fail; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 4985 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 4986 | |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4987 | spin_lock(&BTRFS_I(inode)->lock); |
| 4988 | if (extra_reserve) { |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4989 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
| 4990 | &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4991 | nr_extents--; |
| 4992 | } |
| 4993 | BTRFS_I(inode)->reserved_extents += nr_extents; |
| 4994 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | c64c2bd | 2012-12-14 13:48:14 -0500 | [diff] [blame] | 4995 | |
| 4996 | if (delalloc_lock) |
| 4997 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
Josef Bacik | 660d3f6 | 2011-12-09 11:18:51 -0500 | [diff] [blame] | 4998 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 4999 | if (to_reserve) |
| 5000 | trace_btrfs_space_reservation(root->fs_info,"delalloc", |
| 5001 | btrfs_ino(inode), to_reserve, 1); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5002 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
| 5003 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5004 | return 0; |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5005 | |
| 5006 | out_fail: |
| 5007 | spin_lock(&BTRFS_I(inode)->lock); |
| 5008 | dropped = drop_outstanding_extent(inode); |
| 5009 | /* |
| 5010 | * If the inodes csum_bytes is the same as the original |
| 5011 | * csum_bytes then we know we haven't raced with any free()ers |
| 5012 | * so we can just reduce our inodes csum bytes and carry on. |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5013 | */ |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5014 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5015 | calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | f4881bc | 2013-03-25 16:03:35 -0400 | [diff] [blame] | 5016 | } else { |
| 5017 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; |
| 5018 | u64 bytes; |
| 5019 | |
| 5020 | /* |
| 5021 | * This is tricky, but first we need to figure out how much we |
| 5022 | * free'd from any free-ers that occured during this |
| 5023 | * reservation, so we reset ->csum_bytes to the csum_bytes |
| 5024 | * before we dropped our lock, and then call the free for the |
| 5025 | * number of bytes that were freed while we were trying our |
| 5026 | * reservation. |
| 5027 | */ |
| 5028 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; |
| 5029 | BTRFS_I(inode)->csum_bytes = csum_bytes; |
| 5030 | to_free = calc_csum_metadata_size(inode, bytes, 0); |
| 5031 | |
| 5032 | |
| 5033 | /* |
| 5034 | * Now we need to see how much we would have freed had we not |
| 5035 | * been making this reservation and our ->csum_bytes were not |
| 5036 | * artificially inflated. |
| 5037 | */ |
| 5038 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; |
| 5039 | bytes = csum_bytes - orig_csum_bytes; |
| 5040 | bytes = calc_csum_metadata_size(inode, bytes, 0); |
| 5041 | |
| 5042 | /* |
| 5043 | * Now reset ->csum_bytes to what it should be. If bytes is |
| 5044 | * more than to_free then we would have free'd more space had we |
| 5045 | * not had an artificially high ->csum_bytes, so we need to free |
| 5046 | * the remainder. If bytes is the same or less then we don't |
| 5047 | * need to do anything, the other free-ers did the correct |
| 5048 | * thing. |
| 5049 | */ |
| 5050 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; |
| 5051 | if (bytes > to_free) |
| 5052 | to_free = bytes - to_free; |
| 5053 | else |
| 5054 | to_free = 0; |
| 5055 | } |
Wang Shilong | 88e081bf | 2013-03-01 11:36:01 +0000 | [diff] [blame] | 5056 | spin_unlock(&BTRFS_I(inode)->lock); |
| 5057 | if (dropped) |
| 5058 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
| 5059 | |
| 5060 | if (to_free) { |
| 5061 | btrfs_block_rsv_release(root, block_rsv, to_free); |
| 5062 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5063 | btrfs_ino(inode), to_free, 0); |
| 5064 | } |
| 5065 | if (delalloc_lock) |
| 5066 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); |
| 5067 | return ret; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5068 | } |
| 5069 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5070 | /** |
| 5071 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode |
| 5072 | * @inode: the inode to release the reservation for |
| 5073 | * @num_bytes: the number of bytes we're releasing |
| 5074 | * |
| 5075 | * This will release the metadata reservation for an inode. This can be called |
| 5076 | * once we complete IO for a given set of bytes to release their metadata |
| 5077 | * reservations. |
| 5078 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5079 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
| 5080 | { |
| 5081 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5082 | u64 to_free = 0; |
| 5083 | unsigned dropped; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5084 | |
| 5085 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5086 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5087 | dropped = drop_outstanding_extent(inode); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5088 | |
Miao Xie | 0934856 | 2013-02-07 10:12:07 +0000 | [diff] [blame] | 5089 | if (num_bytes) |
| 5090 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5091 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 5092 | if (dropped > 0) |
| 5093 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5094 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5095 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
| 5096 | btrfs_ino(inode), to_free, 0); |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 5097 | if (root->fs_info->quota_enabled) { |
| 5098 | btrfs_qgroup_free(root, num_bytes + |
| 5099 | dropped * root->leafsize); |
| 5100 | } |
| 5101 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5102 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
| 5103 | to_free); |
| 5104 | } |
| 5105 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5106 | /** |
| 5107 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc |
| 5108 | * @inode: inode we're writing to |
| 5109 | * @num_bytes: the number of bytes we want to allocate |
| 5110 | * |
| 5111 | * This will do the following things |
| 5112 | * |
| 5113 | * o reserve space in the data space info for num_bytes |
| 5114 | * o reserve space in the metadata space info based on number of outstanding |
| 5115 | * extents and how much csums will be needed |
| 5116 | * o add to the inodes ->delalloc_bytes |
| 5117 | * o add it to the fs_info's delalloc inodes list. |
| 5118 | * |
| 5119 | * This will return 0 for success and -ENOSPC if there is no space left. |
| 5120 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5121 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
| 5122 | { |
| 5123 | int ret; |
| 5124 | |
| 5125 | ret = btrfs_check_data_free_space(inode, num_bytes); |
| 5126 | if (ret) |
| 5127 | return ret; |
| 5128 | |
| 5129 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); |
| 5130 | if (ret) { |
| 5131 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5132 | return ret; |
| 5133 | } |
| 5134 | |
| 5135 | return 0; |
| 5136 | } |
| 5137 | |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 5138 | /** |
| 5139 | * btrfs_delalloc_release_space - release data and metadata space for delalloc |
| 5140 | * @inode: inode we're releasing space for |
| 5141 | * @num_bytes: the number of bytes we want to free up |
| 5142 | * |
| 5143 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is |
| 5144 | * called in the case that we don't need the metadata AND data reservations |
| 5145 | * anymore. So if there is an error or we insert an inline extent. |
| 5146 | * |
| 5147 | * This function will release the metadata space that was not used and will |
| 5148 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes |
| 5149 | * list if there are no delalloc bytes left. |
| 5150 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 5151 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
| 5152 | { |
| 5153 | btrfs_delalloc_release_metadata(inode, num_bytes); |
| 5154 | btrfs_free_reserved_data_space(inode, num_bytes); |
| 5155 | } |
| 5156 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 5157 | static int update_block_group(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5158 | u64 bytenr, u64 num_bytes, int alloc) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5159 | { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5160 | struct btrfs_block_group_cache *cache = NULL; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5161 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5162 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5163 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5164 | u64 byte_in_group; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5165 | int factor; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 5166 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5167 | /* block accounting for super block */ |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5168 | spin_lock(&info->delalloc_root_lock); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5169 | old_val = btrfs_super_bytes_used(info->super_copy); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5170 | if (alloc) |
| 5171 | old_val += num_bytes; |
| 5172 | else |
| 5173 | old_val -= num_bytes; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 5174 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame] | 5175 | spin_unlock(&info->delalloc_root_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5176 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5177 | while (total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5178 | cache = btrfs_lookup_block_group(info, bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5179 | if (!cache) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5180 | return -ENOENT; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5181 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 5182 | BTRFS_BLOCK_GROUP_RAID1 | |
| 5183 | BTRFS_BLOCK_GROUP_RAID10)) |
| 5184 | factor = 2; |
| 5185 | else |
| 5186 | factor = 1; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 5187 | /* |
| 5188 | * If this block group has free space cache written out, we |
| 5189 | * need to make sure to load it if we are removing space. This |
| 5190 | * is because we need the unpinning stage to actually add the |
| 5191 | * space back to the block group, otherwise we will leak space. |
| 5192 | */ |
| 5193 | if (!alloc && cache->cached == BTRFS_CACHE_NO) |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5194 | cache_block_group(cache, 1); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5195 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5196 | byte_in_group = bytenr - cache->key.objectid; |
| 5197 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5198 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5199 | spin_lock(&cache->space_info->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5200 | spin_lock(&cache->lock); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5201 | |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 5202 | if (btrfs_test_opt(root, SPACE_CACHE) && |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 5203 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
| 5204 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
| 5205 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5206 | cache->dirty = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5207 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5208 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5209 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5210 | old_val += num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5211 | btrfs_set_block_group_used(&cache->item, old_val); |
| 5212 | cache->reserved -= num_bytes; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5213 | cache->space_info->bytes_reserved -= num_bytes; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5214 | cache->space_info->bytes_used += num_bytes; |
| 5215 | cache->space_info->disk_used += num_bytes * factor; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5216 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5217 | spin_unlock(&cache->space_info->lock); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5218 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5219 | old_val -= num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5220 | btrfs_set_block_group_used(&cache->item, old_val); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5221 | cache->pinned += num_bytes; |
| 5222 | cache->space_info->bytes_pinned += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5223 | cache->space_info->bytes_used -= num_bytes; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 5224 | cache->space_info->disk_used -= num_bytes * factor; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5225 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5226 | spin_unlock(&cache->space_info->lock); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5227 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5228 | set_extent_dirty(info->pinned_extents, |
| 5229 | bytenr, bytenr + num_bytes - 1, |
| 5230 | GFP_NOFS | __GFP_NOFAIL); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 5231 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5232 | btrfs_put_block_group(cache); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5233 | total -= num_bytes; |
| 5234 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5235 | } |
| 5236 | return 0; |
| 5237 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5238 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5239 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 5240 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5241 | struct btrfs_block_group_cache *cache; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5242 | u64 bytenr; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5243 | |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 5244 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 5245 | bytenr = root->fs_info->first_logical_byte; |
| 5246 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 5247 | |
| 5248 | if (bytenr < (u64)-1) |
| 5249 | return bytenr; |
| 5250 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5251 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
| 5252 | if (!cache) |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5253 | return 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5254 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5255 | bytenr = cache->key.objectid; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5256 | btrfs_put_block_group(cache); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5257 | |
| 5258 | return bytenr; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5259 | } |
| 5260 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5261 | static int pin_down_extent(struct btrfs_root *root, |
| 5262 | struct btrfs_block_group_cache *cache, |
| 5263 | u64 bytenr, u64 num_bytes, int reserved) |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5264 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5265 | spin_lock(&cache->space_info->lock); |
| 5266 | spin_lock(&cache->lock); |
| 5267 | cache->pinned += num_bytes; |
| 5268 | cache->space_info->bytes_pinned += num_bytes; |
| 5269 | if (reserved) { |
| 5270 | cache->reserved -= num_bytes; |
| 5271 | cache->space_info->bytes_reserved -= num_bytes; |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5272 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5273 | spin_unlock(&cache->lock); |
| 5274 | spin_unlock(&cache->space_info->lock); |
| 5275 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5276 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
| 5277 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 5278 | return 0; |
| 5279 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5280 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5281 | /* |
| 5282 | * this function must be called within transaction |
| 5283 | */ |
| 5284 | int btrfs_pin_extent(struct btrfs_root *root, |
| 5285 | u64 bytenr, u64 num_bytes, int reserved) |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5286 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5287 | struct btrfs_block_group_cache *cache; |
| 5288 | |
| 5289 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5290 | BUG_ON(!cache); /* Logic error */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5291 | |
| 5292 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); |
| 5293 | |
| 5294 | btrfs_put_block_group(cache); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5295 | return 0; |
| 5296 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 5297 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5298 | /* |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5299 | * this function must be called within transaction |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5300 | */ |
Liu Bo | dcfac41 | 2012-12-27 09:01:20 +0000 | [diff] [blame] | 5301 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5302 | u64 bytenr, u64 num_bytes) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5303 | { |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5304 | struct btrfs_block_group_cache *cache; |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5305 | int ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5306 | |
| 5307 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5308 | if (!cache) |
| 5309 | return -EINVAL; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5310 | |
| 5311 | /* |
| 5312 | * pull in the free space cache (if any) so that our pin |
| 5313 | * removes the free space from the cache. We have load_only set |
| 5314 | * to one because the slow code to read in the free extents does check |
| 5315 | * the pinned extents. |
| 5316 | */ |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 5317 | cache_block_group(cache, 1); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5318 | |
| 5319 | pin_down_extent(root, cache, bytenr, num_bytes, 0); |
| 5320 | |
| 5321 | /* 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] | 5322 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5323 | btrfs_put_block_group(cache); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5324 | return ret; |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 5325 | } |
| 5326 | |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 5327 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
| 5328 | { |
| 5329 | int ret; |
| 5330 | struct btrfs_block_group_cache *block_group; |
| 5331 | struct btrfs_caching_control *caching_ctl; |
| 5332 | |
| 5333 | block_group = btrfs_lookup_block_group(root->fs_info, start); |
| 5334 | if (!block_group) |
| 5335 | return -EINVAL; |
| 5336 | |
| 5337 | cache_block_group(block_group, 0); |
| 5338 | caching_ctl = get_caching_control(block_group); |
| 5339 | |
| 5340 | if (!caching_ctl) { |
| 5341 | /* Logic error */ |
| 5342 | BUG_ON(!block_group_cache_done(block_group)); |
| 5343 | ret = btrfs_remove_free_space(block_group, start, num_bytes); |
| 5344 | } else { |
| 5345 | mutex_lock(&caching_ctl->mutex); |
| 5346 | |
| 5347 | if (start >= caching_ctl->progress) { |
| 5348 | ret = add_excluded_extent(root, start, num_bytes); |
| 5349 | } else if (start + num_bytes <= caching_ctl->progress) { |
| 5350 | ret = btrfs_remove_free_space(block_group, |
| 5351 | start, num_bytes); |
| 5352 | } else { |
| 5353 | num_bytes = caching_ctl->progress - start; |
| 5354 | ret = btrfs_remove_free_space(block_group, |
| 5355 | start, num_bytes); |
| 5356 | if (ret) |
| 5357 | goto out_lock; |
| 5358 | |
| 5359 | num_bytes = (start + num_bytes) - |
| 5360 | caching_ctl->progress; |
| 5361 | start = caching_ctl->progress; |
| 5362 | ret = add_excluded_extent(root, start, num_bytes); |
| 5363 | } |
| 5364 | out_lock: |
| 5365 | mutex_unlock(&caching_ctl->mutex); |
| 5366 | put_caching_control(caching_ctl); |
| 5367 | } |
| 5368 | btrfs_put_block_group(block_group); |
| 5369 | return ret; |
| 5370 | } |
| 5371 | |
| 5372 | int btrfs_exclude_logged_extents(struct btrfs_root *log, |
| 5373 | struct extent_buffer *eb) |
| 5374 | { |
| 5375 | struct btrfs_file_extent_item *item; |
| 5376 | struct btrfs_key key; |
| 5377 | int found_type; |
| 5378 | int i; |
| 5379 | |
| 5380 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) |
| 5381 | return 0; |
| 5382 | |
| 5383 | for (i = 0; i < btrfs_header_nritems(eb); i++) { |
| 5384 | btrfs_item_key_to_cpu(eb, &key, i); |
| 5385 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 5386 | continue; |
| 5387 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); |
| 5388 | found_type = btrfs_file_extent_type(eb, item); |
| 5389 | if (found_type == BTRFS_FILE_EXTENT_INLINE) |
| 5390 | continue; |
| 5391 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) |
| 5392 | continue; |
| 5393 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); |
| 5394 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); |
| 5395 | __exclude_logged_extent(log, key.objectid, key.offset); |
| 5396 | } |
| 5397 | |
| 5398 | return 0; |
| 5399 | } |
| 5400 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5401 | /** |
| 5402 | * btrfs_update_reserved_bytes - update the block_group and space info counters |
| 5403 | * @cache: The cache we are manipulating |
| 5404 | * @num_bytes: The number of bytes in question |
| 5405 | * @reserve: One of the reservation enums |
| 5406 | * |
| 5407 | * This is called by the allocator when it reserves space, or by somebody who is |
| 5408 | * freeing space that was never actually used on disk. For example if you |
| 5409 | * reserve some space for a new leaf in transaction A and before transaction A |
| 5410 | * commits you free that leaf, you call this with reserve set to 0 in order to |
| 5411 | * clear the reservation. |
| 5412 | * |
| 5413 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper |
| 5414 | * ENOSPC accounting. For data we handle the reservation through clearing the |
| 5415 | * delalloc bits in the io_tree. We have to do this since we could end up |
| 5416 | * allocating less disk space for the amount of data we have reserved in the |
| 5417 | * case of compression. |
| 5418 | * |
| 5419 | * If this is a reservation and the block group has become read only we cannot |
| 5420 | * make the reservation and return -EAGAIN, otherwise this function always |
| 5421 | * succeeds. |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5422 | */ |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5423 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
| 5424 | u64 num_bytes, int reserve) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5425 | { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5426 | struct btrfs_space_info *space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5427 | int ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5428 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5429 | spin_lock(&space_info->lock); |
| 5430 | spin_lock(&cache->lock); |
| 5431 | if (reserve != RESERVE_FREE) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5432 | if (cache->ro) { |
| 5433 | ret = -EAGAIN; |
| 5434 | } else { |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5435 | cache->reserved += num_bytes; |
| 5436 | space_info->bytes_reserved += num_bytes; |
| 5437 | if (reserve == RESERVE_ALLOC) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 5438 | trace_btrfs_space_reservation(cache->fs_info, |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 5439 | "space_info", space_info->flags, |
| 5440 | num_bytes, 0); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5441 | space_info->bytes_may_use -= num_bytes; |
| 5442 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5443 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5444 | } else { |
| 5445 | if (cache->ro) |
| 5446 | space_info->bytes_readonly += num_bytes; |
| 5447 | cache->reserved -= num_bytes; |
| 5448 | space_info->bytes_reserved -= num_bytes; |
| 5449 | space_info->reservation_progress++; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5450 | } |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5451 | spin_unlock(&cache->lock); |
| 5452 | spin_unlock(&space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5453 | return ret; |
| 5454 | } |
| 5455 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 5456 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5457 | struct btrfs_root *root) |
| 5458 | { |
| 5459 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5460 | struct btrfs_caching_control *next; |
| 5461 | struct btrfs_caching_control *caching_ctl; |
| 5462 | struct btrfs_block_group_cache *cache; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5463 | struct btrfs_space_info *space_info; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5464 | |
| 5465 | down_write(&fs_info->extent_commit_sem); |
| 5466 | |
| 5467 | list_for_each_entry_safe(caching_ctl, next, |
| 5468 | &fs_info->caching_block_groups, list) { |
| 5469 | cache = caching_ctl->block_group; |
| 5470 | if (block_group_cache_done(cache)) { |
| 5471 | cache->last_byte_to_unpin = (u64)-1; |
| 5472 | list_del_init(&caching_ctl->list); |
| 5473 | put_caching_control(caching_ctl); |
| 5474 | } else { |
| 5475 | cache->last_byte_to_unpin = caching_ctl->progress; |
| 5476 | } |
| 5477 | } |
| 5478 | |
| 5479 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 5480 | fs_info->pinned_extents = &fs_info->freed_extents[1]; |
| 5481 | else |
| 5482 | fs_info->pinned_extents = &fs_info->freed_extents[0]; |
| 5483 | |
| 5484 | up_write(&fs_info->extent_commit_sem); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5485 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5486 | list_for_each_entry_rcu(space_info, &fs_info->space_info, list) |
| 5487 | percpu_counter_set(&space_info->total_bytes_pinned, 0); |
| 5488 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 5489 | update_global_block_rsv(fs_info); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5490 | } |
| 5491 | |
| 5492 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
| 5493 | { |
| 5494 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5495 | struct btrfs_block_group_cache *cache = NULL; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5496 | struct btrfs_space_info *space_info; |
| 5497 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5498 | u64 len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5499 | bool readonly; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5500 | |
| 5501 | while (start <= end) { |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5502 | readonly = false; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5503 | if (!cache || |
| 5504 | start >= cache->key.objectid + cache->key.offset) { |
| 5505 | if (cache) |
| 5506 | btrfs_put_block_group(cache); |
| 5507 | cache = btrfs_lookup_block_group(fs_info, start); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5508 | BUG_ON(!cache); /* Logic error */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5509 | } |
| 5510 | |
| 5511 | len = cache->key.objectid + cache->key.offset - start; |
| 5512 | len = min(len, end + 1 - start); |
| 5513 | |
| 5514 | if (start < cache->last_byte_to_unpin) { |
| 5515 | len = min(len, cache->last_byte_to_unpin - start); |
| 5516 | btrfs_add_free_space(cache, start, len); |
| 5517 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5518 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5519 | start += len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5520 | space_info = cache->space_info; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5521 | |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5522 | spin_lock(&space_info->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5523 | spin_lock(&cache->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5524 | cache->pinned -= len; |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5525 | space_info->bytes_pinned -= len; |
| 5526 | if (cache->ro) { |
| 5527 | space_info->bytes_readonly += len; |
| 5528 | readonly = true; |
| 5529 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5530 | spin_unlock(&cache->lock); |
Josef Bacik | 7b398f8 | 2012-10-22 15:52:28 -0400 | [diff] [blame] | 5531 | if (!readonly && global_rsv->space_info == space_info) { |
| 5532 | spin_lock(&global_rsv->lock); |
| 5533 | if (!global_rsv->full) { |
| 5534 | len = min(len, global_rsv->size - |
| 5535 | global_rsv->reserved); |
| 5536 | global_rsv->reserved += len; |
| 5537 | space_info->bytes_may_use += len; |
| 5538 | if (global_rsv->reserved >= global_rsv->size) |
| 5539 | global_rsv->full = 1; |
| 5540 | } |
| 5541 | spin_unlock(&global_rsv->lock); |
| 5542 | } |
| 5543 | spin_unlock(&space_info->lock); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5544 | } |
| 5545 | |
| 5546 | if (cache) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 5547 | btrfs_put_block_group(cache); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 5548 | return 0; |
| 5549 | } |
| 5550 | |
| 5551 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5552 | struct btrfs_root *root) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5553 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5554 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 5555 | struct extent_io_tree *unpin; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5556 | u64 start; |
| 5557 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5558 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5559 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5560 | if (trans->aborted) |
| 5561 | return 0; |
| 5562 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5563 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
| 5564 | unpin = &fs_info->freed_extents[1]; |
| 5565 | else |
| 5566 | unpin = &fs_info->freed_extents[0]; |
| 5567 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5568 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5569 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 5570 | EXTENT_DIRTY, NULL); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5571 | if (ret) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5572 | break; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5573 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 5574 | if (btrfs_test_opt(root, DISCARD)) |
| 5575 | ret = btrfs_discard_extent(root, start, |
| 5576 | end + 1 - start, NULL); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 5577 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 5578 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 5579 | unpin_extent_range(root, start, end); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5580 | cond_resched(); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5581 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 5582 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 5583 | return 0; |
| 5584 | } |
| 5585 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5586 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
| 5587 | u64 owner, u64 root_objectid) |
| 5588 | { |
| 5589 | struct btrfs_space_info *space_info; |
| 5590 | u64 flags; |
| 5591 | |
| 5592 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
| 5593 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) |
| 5594 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 5595 | else |
| 5596 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 5597 | } else { |
| 5598 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 5599 | } |
| 5600 | |
| 5601 | space_info = __find_space_info(fs_info, flags); |
| 5602 | BUG_ON(!space_info); /* Logic bug */ |
| 5603 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); |
| 5604 | } |
| 5605 | |
| 5606 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5607 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 5608 | struct btrfs_root *root, |
| 5609 | u64 bytenr, u64 num_bytes, u64 parent, |
| 5610 | u64 root_objectid, u64 owner_objectid, |
| 5611 | u64 owner_offset, int refs_to_drop, |
| 5612 | struct btrfs_delayed_extent_op *extent_op) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5613 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 5614 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5615 | struct btrfs_path *path; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 5616 | struct btrfs_fs_info *info = root->fs_info; |
| 5617 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5618 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5619 | struct btrfs_extent_item *ei; |
| 5620 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5621 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5622 | int is_data; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5623 | int extent_slot = 0; |
| 5624 | int found_extent = 0; |
| 5625 | int num_to_del = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5626 | u32 item_size; |
| 5627 | u64 refs; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5628 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 5629 | SKINNY_METADATA); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 5630 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 5631 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 5632 | if (!path) |
| 5633 | return -ENOMEM; |
| 5634 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 5635 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5636 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5637 | |
| 5638 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; |
| 5639 | BUG_ON(!is_data && refs_to_drop != 1); |
| 5640 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5641 | if (is_data) |
| 5642 | skinny_metadata = 0; |
| 5643 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5644 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
| 5645 | bytenr, num_bytes, parent, |
| 5646 | root_objectid, owner_objectid, |
| 5647 | owner_offset); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5648 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5649 | extent_slot = path->slots[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5650 | while (extent_slot >= 0) { |
| 5651 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5652 | extent_slot); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5653 | if (key.objectid != bytenr) |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5654 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5655 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
| 5656 | key.offset == num_bytes) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5657 | found_extent = 1; |
| 5658 | break; |
| 5659 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5660 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
| 5661 | key.offset == owner_objectid) { |
| 5662 | found_extent = 1; |
| 5663 | break; |
| 5664 | } |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5665 | if (path->slots[0] - extent_slot > 5) |
| 5666 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5667 | extent_slot--; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5668 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5669 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 5670 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); |
| 5671 | if (found_extent && item_size < sizeof(*ei)) |
| 5672 | found_extent = 0; |
| 5673 | #endif |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5674 | if (!found_extent) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5675 | BUG_ON(iref); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 5676 | ret = remove_extent_backref(trans, extent_root, path, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5677 | NULL, refs_to_drop, |
| 5678 | is_data); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5679 | if (ret) { |
| 5680 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5681 | goto out; |
| 5682 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5683 | btrfs_release_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5684 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5685 | |
| 5686 | key.objectid = bytenr; |
| 5687 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5688 | key.offset = num_bytes; |
| 5689 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5690 | if (!is_data && skinny_metadata) { |
| 5691 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 5692 | key.offset = owner_objectid; |
| 5693 | } |
| 5694 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5695 | ret = btrfs_search_slot(trans, extent_root, |
| 5696 | &key, path, -1, 1); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5697 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
| 5698 | /* |
| 5699 | * Couldn't find our skinny metadata item, |
| 5700 | * see if we have ye olde extent item. |
| 5701 | */ |
| 5702 | path->slots[0]--; |
| 5703 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 5704 | path->slots[0]); |
| 5705 | if (key.objectid == bytenr && |
| 5706 | key.type == BTRFS_EXTENT_ITEM_KEY && |
| 5707 | key.offset == num_bytes) |
| 5708 | ret = 0; |
| 5709 | } |
| 5710 | |
| 5711 | if (ret > 0 && skinny_metadata) { |
| 5712 | skinny_metadata = false; |
| 5713 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5714 | key.offset = num_bytes; |
| 5715 | btrfs_release_path(path); |
| 5716 | ret = btrfs_search_slot(trans, extent_root, |
| 5717 | &key, path, -1, 1); |
| 5718 | } |
| 5719 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5720 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5721 | 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] | 5722 | ret, bytenr); |
Josef Bacik | b783e62 | 2011-07-13 15:03:50 +0000 | [diff] [blame] | 5723 | if (ret > 0) |
| 5724 | btrfs_print_leaf(extent_root, |
| 5725 | path->nodes[0]); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 5726 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5727 | if (ret < 0) { |
| 5728 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5729 | goto out; |
| 5730 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 5731 | extent_slot = path->slots[0]; |
| 5732 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5733 | } else if (ret == -ENOENT) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5734 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 5735 | WARN_ON(1); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5736 | btrfs_err(info, |
| 5737 | "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] | 5738 | bytenr, parent, root_objectid, owner_objectid, |
| 5739 | owner_offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5740 | } else { |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5741 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5742 | goto out; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 5743 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5744 | |
| 5745 | leaf = path->nodes[0]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5746 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 5747 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 5748 | if (item_size < sizeof(*ei)) { |
| 5749 | BUG_ON(found_extent || extent_slot != path->slots[0]); |
| 5750 | ret = convert_extent_item_v0(trans, extent_root, path, |
| 5751 | owner_objectid, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5752 | if (ret < 0) { |
| 5753 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5754 | goto out; |
| 5755 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5756 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5757 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5758 | path->leave_spinning = 1; |
| 5759 | |
| 5760 | key.objectid = bytenr; |
| 5761 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5762 | key.offset = num_bytes; |
| 5763 | |
| 5764 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 5765 | -1, 1); |
| 5766 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 5767 | 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] | 5768 | ret, bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5769 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 5770 | } |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5771 | if (ret < 0) { |
| 5772 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5773 | goto out; |
| 5774 | } |
| 5775 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5776 | extent_slot = path->slots[0]; |
| 5777 | leaf = path->nodes[0]; |
| 5778 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
| 5779 | } |
| 5780 | #endif |
| 5781 | BUG_ON(item_size < sizeof(*ei)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5782 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 5783 | struct btrfs_extent_item); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 5784 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
| 5785 | key.type == BTRFS_EXTENT_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5786 | struct btrfs_tree_block_info *bi; |
| 5787 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
| 5788 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 5789 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5790 | } |
| 5791 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5792 | refs = btrfs_extent_refs(leaf, ei); |
Josef Bacik | 32b0253 | 2013-04-24 16:38:50 -0400 | [diff] [blame] | 5793 | if (refs < refs_to_drop) { |
| 5794 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " |
| 5795 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); |
| 5796 | ret = -EINVAL; |
| 5797 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5798 | goto out; |
| 5799 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5800 | refs -= refs_to_drop; |
| 5801 | |
| 5802 | if (refs > 0) { |
| 5803 | if (extent_op) |
| 5804 | __run_delayed_extent_op(extent_op, leaf, ei); |
| 5805 | /* |
| 5806 | * In the case of inline back ref, reference count will |
| 5807 | * be updated by remove_extent_backref |
| 5808 | */ |
| 5809 | if (iref) { |
| 5810 | BUG_ON(!found_extent); |
| 5811 | } else { |
| 5812 | btrfs_set_extent_refs(leaf, ei, refs); |
| 5813 | btrfs_mark_buffer_dirty(leaf); |
| 5814 | } |
| 5815 | if (found_extent) { |
| 5816 | ret = remove_extent_backref(trans, extent_root, path, |
| 5817 | iref, refs_to_drop, |
| 5818 | is_data); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5819 | if (ret) { |
| 5820 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5821 | goto out; |
| 5822 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5823 | } |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5824 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
| 5825 | root_objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5826 | } else { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5827 | if (found_extent) { |
| 5828 | BUG_ON(is_data && refs_to_drop != |
| 5829 | extent_data_ref_count(root, path, iref)); |
| 5830 | if (iref) { |
| 5831 | BUG_ON(path->slots[0] != extent_slot); |
| 5832 | } else { |
| 5833 | BUG_ON(path->slots[0] != extent_slot + 1); |
| 5834 | path->slots[0] = extent_slot; |
| 5835 | num_to_del = 2; |
| 5836 | } |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 5837 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5838 | |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 5839 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 5840 | num_to_del); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5841 | if (ret) { |
| 5842 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5843 | goto out; |
| 5844 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5845 | btrfs_release_path(path); |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 5846 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5847 | if (is_data) { |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 5848 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5849 | if (ret) { |
| 5850 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5851 | goto out; |
| 5852 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 5853 | } |
| 5854 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 5855 | ret = update_block_group(root, bytenr, num_bytes, 0); |
David Sterba | 005d642 | 2012-09-18 07:52:32 -0600 | [diff] [blame] | 5856 | if (ret) { |
| 5857 | btrfs_abort_transaction(trans, extent_root, ret); |
| 5858 | goto out; |
| 5859 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5860 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5861 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 5862 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 5863 | return ret; |
| 5864 | } |
| 5865 | |
| 5866 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5867 | * 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] | 5868 | * delayed ref for that extent as well. This searches the delayed ref tree for |
| 5869 | * a given extent, and if there are no other delayed refs to be processed, it |
| 5870 | * removes it from the tree. |
| 5871 | */ |
| 5872 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, |
| 5873 | struct btrfs_root *root, u64 bytenr) |
| 5874 | { |
| 5875 | struct btrfs_delayed_ref_head *head; |
| 5876 | struct btrfs_delayed_ref_root *delayed_refs; |
| 5877 | struct btrfs_delayed_ref_node *ref; |
| 5878 | struct rb_node *node; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5879 | int ret = 0; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5880 | |
| 5881 | delayed_refs = &trans->transaction->delayed_refs; |
| 5882 | spin_lock(&delayed_refs->lock); |
| 5883 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 5884 | if (!head) |
| 5885 | goto out; |
| 5886 | |
| 5887 | node = rb_prev(&head->node.rb_node); |
| 5888 | if (!node) |
| 5889 | goto out; |
| 5890 | |
| 5891 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
| 5892 | |
| 5893 | /* there are still entries for this ref, we can't drop it */ |
| 5894 | if (ref->bytenr == bytenr) |
| 5895 | goto out; |
| 5896 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5897 | if (head->extent_op) { |
| 5898 | if (!head->must_insert_reserved) |
| 5899 | goto out; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 5900 | btrfs_free_delayed_extent_op(head->extent_op); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5901 | head->extent_op = NULL; |
| 5902 | } |
| 5903 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5904 | /* |
| 5905 | * waiting for the lock here would deadlock. If someone else has it |
| 5906 | * locked they are already in the process of dropping it anyway |
| 5907 | */ |
| 5908 | if (!mutex_trylock(&head->mutex)) |
| 5909 | goto out; |
| 5910 | |
| 5911 | /* |
| 5912 | * at this point we have a head with no other entries. Go |
| 5913 | * ahead and process it. |
| 5914 | */ |
| 5915 | head->node.in_tree = 0; |
| 5916 | rb_erase(&head->node.rb_node, &delayed_refs->root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 5917 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5918 | delayed_refs->num_entries--; |
| 5919 | |
| 5920 | /* |
| 5921 | * we don't take a ref on the node because we're removing it from the |
| 5922 | * tree, so we just steal the ref the tree was holding. |
| 5923 | */ |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 5924 | delayed_refs->num_heads--; |
| 5925 | if (list_empty(&head->cluster)) |
| 5926 | delayed_refs->num_heads_ready--; |
| 5927 | |
| 5928 | list_del_init(&head->cluster); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5929 | spin_unlock(&delayed_refs->lock); |
| 5930 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5931 | BUG_ON(head->extent_op); |
| 5932 | if (head->must_insert_reserved) |
| 5933 | ret = 1; |
| 5934 | |
| 5935 | mutex_unlock(&head->mutex); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5936 | btrfs_put_delayed_ref(&head->node); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5937 | return ret; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 5938 | out: |
| 5939 | spin_unlock(&delayed_refs->lock); |
| 5940 | return 0; |
| 5941 | } |
| 5942 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5943 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
| 5944 | struct btrfs_root *root, |
| 5945 | struct extent_buffer *buf, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 5946 | u64 parent, int last_ref) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5947 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5948 | struct btrfs_block_group_cache *cache = NULL; |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5949 | int pin = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5950 | int ret; |
| 5951 | |
| 5952 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 5953 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 5954 | buf->start, buf->len, |
| 5955 | parent, root->root_key.objectid, |
| 5956 | btrfs_header_level(buf), |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 5957 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5958 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5959 | } |
| 5960 | |
| 5961 | if (!last_ref) |
| 5962 | return; |
| 5963 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5964 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5965 | |
| 5966 | if (btrfs_header_generation(buf) == trans->transid) { |
| 5967 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 5968 | ret = check_ref_cleanup(trans, root, buf->start); |
| 5969 | if (!ret) |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 5970 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5971 | } |
| 5972 | |
| 5973 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
| 5974 | pin_down_extent(root, cache, buf->start, buf->len, 1); |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 5975 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5976 | } |
| 5977 | |
| 5978 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); |
| 5979 | |
| 5980 | btrfs_add_free_space(cache, buf->start, buf->len); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 5981 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5982 | pin = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5983 | } |
| 5984 | out: |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 5985 | if (pin) |
| 5986 | add_pinned_bytes(root->fs_info, buf->len, |
| 5987 | btrfs_header_level(buf), |
| 5988 | root->root_key.objectid); |
| 5989 | |
Josef Bacik | a826d6d | 2011-03-16 13:42:43 -0400 | [diff] [blame] | 5990 | /* |
| 5991 | * Deleting the buffer, clear the corrupt flag since it doesn't matter |
| 5992 | * anymore. |
| 5993 | */ |
| 5994 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 5995 | btrfs_put_block_group(cache); |
| 5996 | } |
| 5997 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5998 | /* Can return -ENOMEM */ |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 5999 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 6000 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, |
| 6001 | u64 owner, u64 offset, int for_cow) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6002 | { |
| 6003 | int ret; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6004 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6005 | |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 6006 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
| 6007 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6008 | /* |
| 6009 | * tree log blocks never actually go into the extent allocation |
| 6010 | * tree, just update pinning info and exit early. |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6011 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6012 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 6013 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6014 | /* unlocks the pinned mutex */ |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6015 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6016 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6017 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6018 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
| 6019 | num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6020 | parent, root_objectid, (int)owner, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6021 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6022 | } else { |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6023 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
| 6024 | num_bytes, |
| 6025 | parent, root_objectid, owner, |
| 6026 | offset, BTRFS_DROP_DELAYED_REF, |
| 6027 | NULL, for_cow); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6028 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6029 | return ret; |
| 6030 | } |
| 6031 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6032 | static u64 stripe_align(struct btrfs_root *root, |
| 6033 | struct btrfs_block_group_cache *cache, |
| 6034 | u64 val, u64 num_bytes) |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 6035 | { |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 6036 | u64 ret = ALIGN(val, root->stripesize); |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 6037 | return ret; |
| 6038 | } |
| 6039 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6040 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6041 | * when we wait for progress in the block group caching, its because |
| 6042 | * our allocation attempt failed at least once. So, we must sleep |
| 6043 | * and let some progress happen before we try again. |
| 6044 | * |
| 6045 | * This function will sleep at least once waiting for new free space to |
| 6046 | * show up, and then it will check the block group free space numbers |
| 6047 | * for our min num_bytes. Another option is to have it go ahead |
| 6048 | * and look in the rbtree for a free extent of a given size, but this |
| 6049 | * is a good start. |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6050 | * |
| 6051 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using |
| 6052 | * any of the information in this block group. |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6053 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6054 | static noinline void |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6055 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
| 6056 | u64 num_bytes) |
| 6057 | { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6058 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6059 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6060 | caching_ctl = get_caching_control(cache); |
| 6061 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6062 | return; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6063 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6064 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 6065 | (cache->free_space_ctl->free_space >= num_bytes)); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6066 | |
| 6067 | put_caching_control(caching_ctl); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6068 | } |
| 6069 | |
| 6070 | static noinline int |
| 6071 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) |
| 6072 | { |
| 6073 | struct btrfs_caching_control *caching_ctl; |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6074 | int ret = 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6075 | |
| 6076 | caching_ctl = get_caching_control(cache); |
| 6077 | if (!caching_ctl) |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6078 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6079 | |
| 6080 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6081 | if (cache->cached == BTRFS_CACHE_ERROR) |
| 6082 | ret = -EIO; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6083 | put_caching_control(caching_ctl); |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6084 | return ret; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6085 | } |
| 6086 | |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6087 | int __get_raid_index(u64 flags) |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6088 | { |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6089 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6090 | return BTRFS_RAID_RAID10; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6091 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6092 | return BTRFS_RAID_RAID1; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6093 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6094 | return BTRFS_RAID_DUP; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6095 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 6096 | return BTRFS_RAID_RAID0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6097 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6098 | return BTRFS_RAID_RAID5; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6099 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6100 | return BTRFS_RAID_RAID6; |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6101 | |
Chris Mason | e942f88 | 2013-02-20 14:06:05 -0500 | [diff] [blame] | 6102 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6103 | } |
| 6104 | |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6105 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
| 6106 | { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 6107 | return __get_raid_index(cache->flags); |
Ilya Dryomov | 7738a53 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 6108 | } |
| 6109 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6110 | enum btrfs_loop_type { |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6111 | LOOP_CACHING_NOWAIT = 0, |
| 6112 | LOOP_CACHING_WAIT = 1, |
| 6113 | LOOP_ALLOC_CHUNK = 2, |
| 6114 | LOOP_NO_EMPTY_SIZE = 3, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6115 | }; |
| 6116 | |
| 6117 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6118 | * walks the btree of allocated extents and find a hole of a given size. |
| 6119 | * The key ins is changed to record the hole: |
| 6120 | * ins->objectid == block start |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 6121 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6122 | * ins->offset == number of blocks |
| 6123 | * Any available blocks before search_start are skipped. |
| 6124 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6125 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6126 | u64 num_bytes, u64 empty_size, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 6127 | u64 hint_byte, struct btrfs_key *ins, |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6128 | u64 flags) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6129 | { |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6130 | int ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6131 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6132 | struct btrfs_free_cluster *last_ptr = NULL; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6133 | struct btrfs_block_group_cache *block_group = NULL; |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6134 | struct btrfs_block_group_cache *used_block_group; |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 6135 | u64 search_start = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6136 | int empty_cluster = 2 * 1024 * 1024; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6137 | struct btrfs_space_info *space_info; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6138 | int loop = 0; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6139 | int index = __get_raid_index(flags); |
| 6140 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6141 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6142 | bool found_uncached_bg = false; |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6143 | bool failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6144 | bool failed_alloc = false; |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6145 | bool use_cluster = true; |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6146 | bool have_caching_bg = false; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6147 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 6148 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 6149 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6150 | ins->objectid = 0; |
| 6151 | ins->offset = 0; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 6152 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6153 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6154 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6155 | space_info = __find_space_info(root->fs_info, flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6156 | if (!space_info) { |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6157 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
Josef Bacik | 1b1d1f6 | 2010-03-19 20:49:55 +0000 | [diff] [blame] | 6158 | return -ENOSPC; |
| 6159 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6160 | |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6161 | /* |
| 6162 | * If the space info is for both data and metadata it means we have a |
| 6163 | * small filesystem and we can't use the clustering stuff. |
| 6164 | */ |
| 6165 | if (btrfs_mixed_space_info(space_info)) |
| 6166 | use_cluster = false; |
| 6167 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6168 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6169 | last_ptr = &root->fs_info->meta_alloc_cluster; |
Chris Mason | 536ac8a | 2009-02-12 09:41:38 -0500 | [diff] [blame] | 6170 | if (!btrfs_test_opt(root, SSD)) |
| 6171 | empty_cluster = 64 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6172 | } |
| 6173 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6174 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
Josef Bacik | 6737773 | 2010-09-16 16:19:09 -0400 | [diff] [blame] | 6175 | btrfs_test_opt(root, SSD)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6176 | last_ptr = &root->fs_info->data_alloc_cluster; |
| 6177 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6178 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6179 | if (last_ptr) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6180 | spin_lock(&last_ptr->lock); |
| 6181 | if (last_ptr->block_group) |
| 6182 | hint_byte = last_ptr->window_start; |
| 6183 | spin_unlock(&last_ptr->lock); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6184 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6185 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 6186 | search_start = max(search_start, first_logical_byte(root, 0)); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 6187 | search_start = max(search_start, hint_byte); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6188 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6189 | if (!last_ptr) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6190 | empty_cluster = 0; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6191 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6192 | if (search_start == hint_byte) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6193 | block_group = btrfs_lookup_block_group(root->fs_info, |
| 6194 | search_start); |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6195 | used_block_group = block_group; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6196 | /* |
| 6197 | * we don't want to use the block group if it doesn't match our |
| 6198 | * allocation bits, or if its not cached. |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6199 | * |
| 6200 | * However if we are re-searching with an ideal block group |
| 6201 | * 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] | 6202 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6203 | if (block_group && block_group_bits(block_group, flags) && |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6204 | block_group->cached != BTRFS_CACHE_NO) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6205 | down_read(&space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6206 | if (list_empty(&block_group->list) || |
| 6207 | block_group->ro) { |
| 6208 | /* |
| 6209 | * someone is removing this block group, |
| 6210 | * we can't jump into the have_block_group |
| 6211 | * target because our list pointers are not |
| 6212 | * valid |
| 6213 | */ |
| 6214 | btrfs_put_block_group(block_group); |
| 6215 | up_read(&space_info->groups_sem); |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6216 | } else { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6217 | index = get_block_group_index(block_group); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6218 | goto have_block_group; |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6219 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6220 | } else if (block_group) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6221 | btrfs_put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6222 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6223 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6224 | search: |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6225 | have_caching_bg = false; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6226 | down_read(&space_info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6227 | list_for_each_entry(block_group, &space_info->block_groups[index], |
| 6228 | list) { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6229 | u64 offset; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6230 | int cached; |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 6231 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6232 | used_block_group = block_group; |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 6233 | btrfs_get_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6234 | search_start = block_group->key.objectid; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6235 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6236 | /* |
| 6237 | * this can happen if we end up cycling through all the |
| 6238 | * raid types, but we want to make sure we only allocate |
| 6239 | * for the proper type. |
| 6240 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6241 | if (!block_group_bits(block_group, flags)) { |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6242 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
| 6243 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6244 | BTRFS_BLOCK_GROUP_RAID5 | |
| 6245 | BTRFS_BLOCK_GROUP_RAID6 | |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6246 | BTRFS_BLOCK_GROUP_RAID10; |
| 6247 | |
| 6248 | /* |
| 6249 | * if they asked for extra copies and this block group |
| 6250 | * doesn't provide them, bail. This does allow us to |
| 6251 | * fill raid0 from raid1. |
| 6252 | */ |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6253 | if ((flags & extra) && !(block_group->flags & extra)) |
Chris Mason | 83a50de | 2010-12-13 15:06:46 -0500 | [diff] [blame] | 6254 | goto loop; |
| 6255 | } |
| 6256 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6257 | have_block_group: |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 6258 | cached = block_group_cache_done(block_group); |
| 6259 | if (unlikely(!cached)) { |
Josef Bacik | 291c7d2 | 2011-11-14 13:52:14 -0500 | [diff] [blame] | 6260 | found_uncached_bg = true; |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 6261 | ret = cache_block_group(block_group, 0); |
Chris Mason | 1d4284b | 2012-03-28 20:31:37 -0400 | [diff] [blame] | 6262 | BUG_ON(ret < 0); |
| 6263 | ret = 0; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6264 | } |
| 6265 | |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 6266 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
| 6267 | goto loop; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6268 | if (unlikely(block_group->ro)) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6269 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6270 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6271 | /* |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6272 | * Ok we want to try and use the cluster allocator, so |
| 6273 | * lets look there |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6274 | */ |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6275 | if (last_ptr) { |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6276 | unsigned long aligned_cluster; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6277 | /* |
| 6278 | * the refill lock keeps out other |
| 6279 | * people trying to start a new cluster |
| 6280 | */ |
| 6281 | spin_lock(&last_ptr->refill_lock); |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6282 | used_block_group = last_ptr->block_group; |
| 6283 | if (used_block_group != block_group && |
| 6284 | (!used_block_group || |
| 6285 | used_block_group->ro || |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6286 | !block_group_bits(used_block_group, flags))) { |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6287 | used_block_group = block_group; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6288 | goto refill_cluster; |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6289 | } |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6290 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6291 | if (used_block_group != block_group) |
| 6292 | btrfs_get_block_group(used_block_group); |
| 6293 | |
| 6294 | offset = btrfs_alloc_from_cluster(used_block_group, |
| 6295 | last_ptr, num_bytes, used_block_group->key.objectid); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6296 | if (offset) { |
| 6297 | /* we have a block, we're done */ |
| 6298 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6299 | trace_btrfs_reserve_extent_cluster(root, |
| 6300 | block_group, search_start, num_bytes); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6301 | goto checks; |
| 6302 | } |
| 6303 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6304 | WARN_ON(last_ptr->block_group != used_block_group); |
| 6305 | if (used_block_group != block_group) { |
| 6306 | btrfs_put_block_group(used_block_group); |
| 6307 | used_block_group = block_group; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6308 | } |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 6309 | refill_cluster: |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6310 | BUG_ON(used_block_group != block_group); |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6311 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
| 6312 | * set up a new clusters, so lets just skip it |
| 6313 | * and let the allocator find whatever block |
| 6314 | * it can find. If we reach this point, we |
| 6315 | * will have tried the cluster allocator |
| 6316 | * plenty of times and not have found |
| 6317 | * anything, so we are likely way too |
| 6318 | * fragmented for the clustering stuff to find |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6319 | * anything. |
| 6320 | * |
| 6321 | * However, if the cluster is taken from the |
| 6322 | * current block group, release the cluster |
| 6323 | * first, so that we stand a better chance of |
| 6324 | * succeeding in the unclustered |
| 6325 | * allocation. */ |
| 6326 | if (loop >= LOOP_NO_EMPTY_SIZE && |
| 6327 | last_ptr->block_group != block_group) { |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6328 | spin_unlock(&last_ptr->refill_lock); |
| 6329 | goto unclustered_alloc; |
| 6330 | } |
| 6331 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6332 | /* |
| 6333 | * this cluster didn't work out, free it and |
| 6334 | * start over |
| 6335 | */ |
| 6336 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
| 6337 | |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6338 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
| 6339 | spin_unlock(&last_ptr->refill_lock); |
| 6340 | goto unclustered_alloc; |
| 6341 | } |
| 6342 | |
Chris Mason | 8de972b | 2013-01-04 15:39:43 -0500 | [diff] [blame] | 6343 | aligned_cluster = max_t(unsigned long, |
| 6344 | empty_cluster + empty_size, |
| 6345 | block_group->full_stripe_len); |
| 6346 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6347 | /* allocate a cluster in this block group */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6348 | ret = btrfs_find_space_cluster(root, block_group, |
| 6349 | last_ptr, search_start, |
| 6350 | num_bytes, |
| 6351 | aligned_cluster); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6352 | if (ret == 0) { |
| 6353 | /* |
| 6354 | * now pull our allocation out of this |
| 6355 | * cluster |
| 6356 | */ |
| 6357 | offset = btrfs_alloc_from_cluster(block_group, |
| 6358 | last_ptr, num_bytes, |
| 6359 | search_start); |
| 6360 | if (offset) { |
| 6361 | /* we found one, proceed */ |
| 6362 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6363 | trace_btrfs_reserve_extent_cluster(root, |
| 6364 | block_group, search_start, |
| 6365 | num_bytes); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6366 | goto checks; |
| 6367 | } |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6368 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
| 6369 | && !failed_cluster_refill) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6370 | spin_unlock(&last_ptr->refill_lock); |
| 6371 | |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6372 | failed_cluster_refill = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6373 | wait_block_group_cache_progress(block_group, |
| 6374 | num_bytes + empty_cluster + empty_size); |
| 6375 | goto have_block_group; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6376 | } |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6377 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6378 | /* |
| 6379 | * at this point we either didn't find a cluster |
| 6380 | * or we weren't able to allocate a block from our |
| 6381 | * cluster. Free the cluster we've been trying |
| 6382 | * to use, and go to the next block group |
| 6383 | */ |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6384 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6385 | spin_unlock(&last_ptr->refill_lock); |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6386 | goto loop; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6387 | } |
| 6388 | |
Alexandre Oliva | 062c05c | 2011-12-07 19:50:42 -0500 | [diff] [blame] | 6389 | unclustered_alloc: |
Alexandre Oliva | a5f6f71 | 2011-12-12 04:48:19 -0200 | [diff] [blame] | 6390 | spin_lock(&block_group->free_space_ctl->tree_lock); |
| 6391 | if (cached && |
| 6392 | block_group->free_space_ctl->free_space < |
| 6393 | num_bytes + empty_cluster + empty_size) { |
| 6394 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6395 | goto loop; |
| 6396 | } |
| 6397 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
| 6398 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6399 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
| 6400 | num_bytes, empty_size); |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6401 | /* |
| 6402 | * If we didn't find a chunk, and we haven't failed on this |
| 6403 | * block group before, and this block group is in the middle of |
| 6404 | * caching and we are ok with waiting, then go ahead and wait |
| 6405 | * for progress to be made, and set failed_alloc to true. |
| 6406 | * |
| 6407 | * If failed_alloc is true then we've already waited on this |
| 6408 | * block group once and should move on to the next block group. |
| 6409 | */ |
| 6410 | if (!offset && !failed_alloc && !cached && |
| 6411 | loop > LOOP_CACHING_NOWAIT) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6412 | wait_block_group_cache_progress(block_group, |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6413 | num_bytes + empty_size); |
| 6414 | failed_alloc = true; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6415 | goto have_block_group; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6416 | } else if (!offset) { |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6417 | if (!cached) |
| 6418 | have_caching_bg = true; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6419 | goto loop; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6420 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6421 | checks: |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 6422 | search_start = stripe_align(root, used_block_group, |
| 6423 | offset, num_bytes); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 6424 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6425 | /* move on to the next group */ |
| 6426 | if (search_start + num_bytes > |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6427 | used_block_group->key.objectid + used_block_group->key.offset) { |
| 6428 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6429 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6430 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6431 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6432 | if (offset < search_start) |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6433 | btrfs_add_free_space(used_block_group, offset, |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 6434 | search_start - offset); |
| 6435 | BUG_ON(offset > search_start); |
| 6436 | |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6437 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6438 | alloc_type); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6439 | if (ret == -EAGAIN) { |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6440 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6441 | goto loop; |
| 6442 | } |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6443 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6444 | /* we are all good, lets return */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6445 | ins->objectid = search_start; |
| 6446 | ins->offset = num_bytes; |
| 6447 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 6448 | trace_btrfs_reserve_extent(orig_root, block_group, |
| 6449 | search_start, num_bytes); |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6450 | if (used_block_group != block_group) |
| 6451 | btrfs_put_block_group(used_block_group); |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 6452 | btrfs_put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6453 | break; |
| 6454 | loop: |
Josef Bacik | 0a24325 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 6455 | failed_cluster_refill = false; |
Josef Bacik | 1cdda9b | 2009-10-06 10:04:28 -0400 | [diff] [blame] | 6456 | failed_alloc = false; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6457 | BUG_ON(index != get_block_group_index(block_group)); |
Alexandre Oliva | 274bd4f | 2011-12-07 20:08:40 -0500 | [diff] [blame] | 6458 | if (used_block_group != block_group) |
| 6459 | btrfs_put_block_group(used_block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6460 | btrfs_put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6461 | } |
| 6462 | up_read(&space_info->groups_sem); |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 6463 | |
Miao Xie | 60d2adb | 2011-09-09 17:34:35 +0800 | [diff] [blame] | 6464 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
| 6465 | goto search; |
| 6466 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6467 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
| 6468 | goto search; |
| 6469 | |
Josef Bacik | 285ff5a | 2012-01-13 15:27:45 -0500 | [diff] [blame] | 6470 | /* |
Josef Bacik | ccf0e72 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 6471 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
| 6472 | * caching kthreads as we move along |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6473 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
| 6474 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again |
| 6475 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try |
| 6476 | * again |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6477 | */ |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6478 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6479 | index = 0; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6480 | loop++; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6481 | if (loop == LOOP_ALLOC_CHUNK) { |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6482 | struct btrfs_trans_handle *trans; |
| 6483 | |
| 6484 | trans = btrfs_join_transaction(root); |
| 6485 | if (IS_ERR(trans)) { |
| 6486 | ret = PTR_ERR(trans); |
| 6487 | goto out; |
| 6488 | } |
| 6489 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6490 | ret = do_chunk_alloc(trans, root, flags, |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6491 | CHUNK_ALLOC_FORCE); |
| 6492 | /* |
| 6493 | * Do not bail out on ENOSPC since we |
| 6494 | * can do more things. |
| 6495 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6496 | if (ret < 0 && ret != -ENOSPC) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6497 | btrfs_abort_transaction(trans, |
| 6498 | root, ret); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6499 | else |
| 6500 | ret = 0; |
| 6501 | btrfs_end_transaction(trans, root); |
| 6502 | if (ret) |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 6503 | goto out; |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6504 | } |
| 6505 | |
| 6506 | if (loop == LOOP_NO_EMPTY_SIZE) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6507 | empty_size = 0; |
| 6508 | empty_cluster = 0; |
| 6509 | } |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 6510 | |
Josef Bacik | 723bda2 | 2011-05-27 16:11:38 -0400 | [diff] [blame] | 6511 | goto search; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6512 | } else if (!ins->objectid) { |
| 6513 | ret = -ENOSPC; |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 6514 | } else if (ins->objectid) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 6515 | ret = 0; |
| 6516 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6517 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6518 | |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 6519 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6520 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 6521 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6522 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
| 6523 | int dump_block_groups) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6524 | { |
| 6525 | struct btrfs_block_group_cache *cache; |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6526 | int index = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6527 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6528 | spin_lock(&info->lock); |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6529 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6530 | info->flags, |
| 6531 | info->total_bytes - info->bytes_used - info->bytes_pinned - |
| 6532 | info->bytes_reserved - info->bytes_readonly, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6533 | (info->full) ? "" : "not "); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6534 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
| 6535 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6536 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
| 6537 | info->bytes_reserved, info->bytes_may_use, |
| 6538 | info->bytes_readonly); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6539 | spin_unlock(&info->lock); |
| 6540 | |
| 6541 | if (!dump_block_groups) |
| 6542 | return; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6543 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6544 | down_read(&info->groups_sem); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6545 | again: |
| 6546 | list_for_each_entry(cache, &info->block_groups[index], list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6547 | spin_lock(&cache->lock); |
Liu Bo | 799ffc3 | 2012-07-06 03:31:35 -0600 | [diff] [blame] | 6548 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6549 | cache->key.objectid, cache->key.offset, |
| 6550 | btrfs_block_group_used(&cache->item), cache->pinned, |
| 6551 | cache->reserved, cache->ro ? "[readonly]" : ""); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6552 | btrfs_dump_free_space(cache, bytes); |
| 6553 | spin_unlock(&cache->lock); |
| 6554 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 6555 | if (++index < BTRFS_NR_RAID_TYPES) |
| 6556 | goto again; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6557 | up_read(&info->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6558 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 6559 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6560 | int btrfs_reserve_extent(struct btrfs_root *root, |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6561 | u64 num_bytes, u64 min_alloc_size, |
| 6562 | u64 empty_size, u64 hint_byte, |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6563 | struct btrfs_key *ins, int is_data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6564 | { |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6565 | bool final_tried = false; |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6566 | u64 flags; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6567 | int ret; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6568 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6569 | flags = btrfs_get_alloc_profile(root, is_data); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 6570 | again: |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 6571 | WARN_ON(num_bytes < root->sectorsize); |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6572 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
| 6573 | flags); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 6574 | |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6575 | if (ret == -ENOSPC) { |
| 6576 | if (!final_tried) { |
| 6577 | num_bytes = num_bytes >> 1; |
Zach Brown | 24542bf | 2012-11-16 00:04:43 +0000 | [diff] [blame] | 6578 | num_bytes = round_down(num_bytes, root->sectorsize); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6579 | num_bytes = max(num_bytes, min_alloc_size); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6580 | if (num_bytes == min_alloc_size) |
| 6581 | final_tried = true; |
| 6582 | goto again; |
| 6583 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 6584 | struct btrfs_space_info *sinfo; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6585 | |
David Sterba | b6919a5 | 2013-04-29 13:39:40 +0000 | [diff] [blame] | 6586 | sinfo = __find_space_info(root->fs_info, flags); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6587 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6588 | flags, num_bytes); |
Jeff Mahoney | 5380428 | 2012-03-01 14:56:28 +0100 | [diff] [blame] | 6589 | if (sinfo) |
| 6590 | dump_space_info(sinfo, num_bytes, 1); |
Miao Xie | 9e622d6 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 6591 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6592 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6593 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 6594 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
| 6595 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6596 | return ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6597 | } |
| 6598 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6599 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
| 6600 | u64 start, u64 len, int pin) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6601 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6602 | struct btrfs_block_group_cache *cache; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6603 | int ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6604 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6605 | cache = btrfs_lookup_block_group(root->fs_info, start); |
| 6606 | if (!cache) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6607 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6608 | start); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6609 | return -ENOSPC; |
| 6610 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6611 | |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 6612 | if (btrfs_test_opt(root, DISCARD)) |
| 6613 | ret = btrfs_discard_extent(root, start, len, NULL); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 6614 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6615 | if (pin) |
| 6616 | pin_down_extent(root, cache, start, len, 1); |
| 6617 | else { |
| 6618 | btrfs_add_free_space(cache, start, len); |
| 6619 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); |
| 6620 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 6621 | btrfs_put_block_group(cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 6622 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 6623 | trace_btrfs_reserved_extent_free(root, start, len); |
| 6624 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6625 | return ret; |
| 6626 | } |
| 6627 | |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 6628 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
| 6629 | u64 start, u64 len) |
| 6630 | { |
| 6631 | return __btrfs_free_reserved_extent(root, start, len, 0); |
| 6632 | } |
| 6633 | |
| 6634 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, |
| 6635 | u64 start, u64 len) |
| 6636 | { |
| 6637 | return __btrfs_free_reserved_extent(root, start, len, 1); |
| 6638 | } |
| 6639 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6640 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 6641 | struct btrfs_root *root, |
| 6642 | u64 parent, u64 root_objectid, |
| 6643 | u64 flags, u64 owner, u64 offset, |
| 6644 | struct btrfs_key *ins, int ref_mod) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6645 | { |
| 6646 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6647 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6648 | struct btrfs_extent_item *extent_item; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6649 | struct btrfs_extent_inline_ref *iref; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6650 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6651 | struct extent_buffer *leaf; |
| 6652 | int type; |
| 6653 | u32 size; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 6654 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6655 | if (parent > 0) |
| 6656 | type = BTRFS_SHARED_DATA_REF_KEY; |
| 6657 | else |
| 6658 | type = BTRFS_EXTENT_DATA_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 6659 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6660 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 6661 | |
| 6662 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 6663 | if (!path) |
| 6664 | return -ENOMEM; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 6665 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 6666 | path->leave_spinning = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6667 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 6668 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6669 | if (ret) { |
| 6670 | btrfs_free_path(path); |
| 6671 | return ret; |
| 6672 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6673 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6674 | leaf = path->nodes[0]; |
| 6675 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 6676 | struct btrfs_extent_item); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6677 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
| 6678 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 6679 | btrfs_set_extent_flags(leaf, extent_item, |
| 6680 | flags | BTRFS_EXTENT_FLAG_DATA); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 6681 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6682 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
| 6683 | btrfs_set_extent_inline_ref_type(leaf, iref, type); |
| 6684 | if (parent > 0) { |
| 6685 | struct btrfs_shared_data_ref *ref; |
| 6686 | ref = (struct btrfs_shared_data_ref *)(iref + 1); |
| 6687 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 6688 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); |
| 6689 | } else { |
| 6690 | struct btrfs_extent_data_ref *ref; |
| 6691 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 6692 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); |
| 6693 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); |
| 6694 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); |
| 6695 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); |
| 6696 | } |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 6697 | |
| 6698 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 6699 | btrfs_free_path(path); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 6700 | |
Liu Bo | c53d613 | 2012-12-27 09:01:19 +0000 | [diff] [blame] | 6701 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6702 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6703 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6704 | ins->objectid, ins->offset); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 6705 | BUG(); |
| 6706 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6707 | return ret; |
| 6708 | } |
| 6709 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6710 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
| 6711 | struct btrfs_root *root, |
| 6712 | u64 parent, u64 root_objectid, |
| 6713 | u64 flags, struct btrfs_disk_key *key, |
| 6714 | int level, struct btrfs_key *ins) |
| 6715 | { |
| 6716 | int ret; |
| 6717 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 6718 | struct btrfs_extent_item *extent_item; |
| 6719 | struct btrfs_tree_block_info *block_info; |
| 6720 | struct btrfs_extent_inline_ref *iref; |
| 6721 | struct btrfs_path *path; |
| 6722 | struct extent_buffer *leaf; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6723 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
| 6724 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 6725 | SKINNY_METADATA); |
| 6726 | |
| 6727 | if (!skinny_metadata) |
| 6728 | size += sizeof(*block_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6729 | |
| 6730 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 6731 | if (!path) |
| 6732 | return -ENOMEM; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6733 | |
| 6734 | path->leave_spinning = 1; |
| 6735 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
| 6736 | ins, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6737 | if (ret) { |
| 6738 | btrfs_free_path(path); |
| 6739 | return ret; |
| 6740 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6741 | |
| 6742 | leaf = path->nodes[0]; |
| 6743 | extent_item = btrfs_item_ptr(leaf, path->slots[0], |
| 6744 | struct btrfs_extent_item); |
| 6745 | btrfs_set_extent_refs(leaf, extent_item, 1); |
| 6746 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); |
| 6747 | btrfs_set_extent_flags(leaf, extent_item, |
| 6748 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6749 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6750 | if (skinny_metadata) { |
| 6751 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); |
| 6752 | } else { |
| 6753 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); |
| 6754 | btrfs_set_tree_block_key(leaf, block_info, key); |
| 6755 | btrfs_set_tree_block_level(leaf, block_info, level); |
| 6756 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); |
| 6757 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6758 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6759 | if (parent > 0) { |
| 6760 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); |
| 6761 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 6762 | BTRFS_SHARED_BLOCK_REF_KEY); |
| 6763 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); |
| 6764 | } else { |
| 6765 | btrfs_set_extent_inline_ref_type(leaf, iref, |
| 6766 | BTRFS_TREE_BLOCK_REF_KEY); |
| 6767 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); |
| 6768 | } |
| 6769 | |
| 6770 | btrfs_mark_buffer_dirty(leaf); |
| 6771 | btrfs_free_path(path); |
| 6772 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6773 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6774 | if (ret) { /* -ENOENT, logic error */ |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 6775 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 6776 | ins->objectid, ins->offset); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6777 | BUG(); |
| 6778 | } |
| 6779 | return ret; |
| 6780 | } |
| 6781 | |
| 6782 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 6783 | struct btrfs_root *root, |
| 6784 | u64 root_objectid, u64 owner, |
| 6785 | u64 offset, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6786 | { |
| 6787 | int ret; |
Chris Mason | 1c2308f | 2008-09-23 13:14:13 -0400 | [diff] [blame] | 6788 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6789 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 6790 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6791 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
| 6792 | ins->offset, 0, |
| 6793 | root_objectid, owner, offset, |
| 6794 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6795 | return ret; |
| 6796 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6797 | |
| 6798 | /* |
| 6799 | * this is used by the tree logging recovery code. It records that |
| 6800 | * an extent has been allocated and makes sure to clear the free |
| 6801 | * space cache bits as well |
| 6802 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6803 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
| 6804 | struct btrfs_root *root, |
| 6805 | u64 root_objectid, u64 owner, u64 offset, |
| 6806 | struct btrfs_key *ins) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6807 | { |
| 6808 | int ret; |
| 6809 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 6810 | |
| 6811 | /* |
| 6812 | * Mixed block groups will exclude before processing the log so we only |
| 6813 | * need to do the exlude dance if this fs isn't mixed. |
| 6814 | */ |
| 6815 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { |
| 6816 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); |
| 6817 | if (ret) |
| 6818 | return ret; |
| 6819 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6820 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6821 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 6822 | if (!block_group) |
| 6823 | return -EINVAL; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 6824 | |
Josef Bacik | fb25e91 | 2011-07-26 17:00:46 -0400 | [diff] [blame] | 6825 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
| 6826 | RESERVE_ALLOC_NO_ACCOUNT); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6827 | BUG_ON(ret); /* logic error */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6828 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
| 6829 | 0, owner, offset, ins, 1); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 6830 | btrfs_put_block_group(block_group); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6831 | return ret; |
| 6832 | } |
| 6833 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 6834 | static struct extent_buffer * |
| 6835 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 6836 | u64 bytenr, u32 blocksize, int level) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6837 | { |
| 6838 | struct extent_buffer *buf; |
| 6839 | |
| 6840 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 6841 | if (!buf) |
| 6842 | return ERR_PTR(-ENOMEM); |
| 6843 | btrfs_set_header_generation(buf, trans->transid); |
Chris Mason | 85d4e46 | 2011-07-26 16:11:19 -0400 | [diff] [blame] | 6844 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6845 | btrfs_tree_lock(buf); |
| 6846 | clean_tree_block(trans, root, buf); |
Josef Bacik | 3083ee2 | 2012-03-09 16:01:49 -0500 | [diff] [blame] | 6847 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 6848 | |
| 6849 | btrfs_set_lock_blocking(buf); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6850 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 6851 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 6852 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 6853 | /* |
| 6854 | * we allow two log transactions at a time, use different |
| 6855 | * EXENT bit to differentiate dirty pages. |
| 6856 | */ |
| 6857 | if (root->log_transid % 2 == 0) |
| 6858 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
| 6859 | buf->start + buf->len - 1, GFP_NOFS); |
| 6860 | else |
| 6861 | set_extent_new(&root->dirty_log_pages, buf->start, |
| 6862 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 6863 | } else { |
| 6864 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 6865 | buf->start + buf->len - 1, GFP_NOFS); |
| 6866 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6867 | trans->blocks_used++; |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 6868 | /* this returns a buffer locked for blocking */ |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 6869 | return buf; |
| 6870 | } |
| 6871 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6872 | static struct btrfs_block_rsv * |
| 6873 | use_block_rsv(struct btrfs_trans_handle *trans, |
| 6874 | struct btrfs_root *root, u32 blocksize) |
| 6875 | { |
| 6876 | struct btrfs_block_rsv *block_rsv; |
Josef Bacik | 68a8227 | 2011-01-24 21:43:20 +0000 | [diff] [blame] | 6877 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6878 | int ret; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 6879 | bool global_updated = false; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6880 | |
| 6881 | block_rsv = get_block_rsv(trans, root); |
| 6882 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 6883 | if (unlikely(block_rsv->size == 0)) |
| 6884 | goto try_reserve; |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 6885 | again: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6886 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
| 6887 | if (!ret) |
| 6888 | return block_rsv; |
| 6889 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 6890 | if (block_rsv->failfast) |
| 6891 | return ERR_PTR(ret); |
| 6892 | |
Miao Xie | d88033d | 2013-05-13 13:55:12 +0000 | [diff] [blame] | 6893 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
| 6894 | global_updated = true; |
| 6895 | update_global_block_rsv(root->fs_info); |
| 6896 | goto again; |
| 6897 | } |
| 6898 | |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 6899 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
| 6900 | static DEFINE_RATELIMIT_STATE(_rs, |
| 6901 | DEFAULT_RATELIMIT_INTERVAL * 10, |
| 6902 | /*DEFAULT_RATELIMIT_BURST*/ 1); |
| 6903 | if (__ratelimit(&_rs)) |
| 6904 | WARN(1, KERN_DEBUG |
| 6905 | "btrfs: block rsv returned %d\n", ret); |
| 6906 | } |
| 6907 | try_reserve: |
| 6908 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
| 6909 | BTRFS_RESERVE_NO_FLUSH); |
| 6910 | if (!ret) |
| 6911 | return block_rsv; |
| 6912 | /* |
| 6913 | * If we couldn't reserve metadata bytes try and use some from |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 6914 | * the global reserve if its space type is the same as the global |
| 6915 | * reservation. |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 6916 | */ |
Miao Xie | 5881cfc | 2013-05-13 13:55:11 +0000 | [diff] [blame] | 6917 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
| 6918 | block_rsv->space_info == global_rsv->space_info) { |
Miao Xie | b586b32 | 2013-05-13 13:55:10 +0000 | [diff] [blame] | 6919 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
| 6920 | if (!ret) |
| 6921 | return global_rsv; |
| 6922 | } |
| 6923 | return ERR_PTR(ret); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6924 | } |
| 6925 | |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 6926 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
| 6927 | struct btrfs_block_rsv *block_rsv, u32 blocksize) |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6928 | { |
| 6929 | block_rsv_add_bytes(block_rsv, blocksize, 0); |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 6930 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6931 | } |
| 6932 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6933 | /* |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6934 | * finds a free extent and does all the dirty work required for allocation |
| 6935 | * returns the key for the extent through ins, and a tree buffer for |
| 6936 | * the first block of the extent through buf. |
| 6937 | * |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6938 | * returns the tree buffer or NULL. |
| 6939 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6940 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6941 | struct btrfs_root *root, u32 blocksize, |
| 6942 | u64 parent, u64 root_objectid, |
| 6943 | struct btrfs_disk_key *key, int level, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6944 | u64 hint, u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6945 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 6946 | struct btrfs_key ins; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6947 | struct btrfs_block_rsv *block_rsv; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6948 | struct extent_buffer *buf; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6949 | u64 flags = 0; |
| 6950 | int ret; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6951 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
| 6952 | SKINNY_METADATA); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6953 | |
| 6954 | block_rsv = use_block_rsv(trans, root, blocksize); |
| 6955 | if (IS_ERR(block_rsv)) |
| 6956 | return ERR_CAST(block_rsv); |
| 6957 | |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 6958 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 6959 | empty_size, hint, &ins, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6960 | if (ret) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 6961 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 6962 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6963 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 6964 | |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 6965 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
| 6966 | blocksize, level); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6967 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6968 | |
| 6969 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| 6970 | if (parent == 0) |
| 6971 | parent = ins.objectid; |
| 6972 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 6973 | } else |
| 6974 | BUG_ON(parent > 0); |
| 6975 | |
| 6976 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
| 6977 | struct btrfs_delayed_extent_op *extent_op; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 6978 | extent_op = btrfs_alloc_delayed_extent_op(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6979 | BUG_ON(!extent_op); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6980 | if (key) |
| 6981 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); |
| 6982 | else |
| 6983 | memset(&extent_op->key, 0, sizeof(extent_op->key)); |
| 6984 | extent_op->flags_to_set = flags; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 6985 | if (skinny_metadata) |
| 6986 | extent_op->update_key = 0; |
| 6987 | else |
| 6988 | extent_op->update_key = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6989 | extent_op->update_flags = 1; |
| 6990 | extent_op->is_data = 0; |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 6991 | extent_op->level = level; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6992 | |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 6993 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
| 6994 | ins.objectid, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6995 | ins.offset, parent, root_objectid, |
| 6996 | level, BTRFS_ADD_DELAYED_EXTENT, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 6997 | extent_op, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6998 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6999 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 7000 | return buf; |
| 7001 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 7002 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7003 | struct walk_control { |
| 7004 | u64 refs[BTRFS_MAX_LEVEL]; |
| 7005 | u64 flags[BTRFS_MAX_LEVEL]; |
| 7006 | struct btrfs_key update_progress; |
| 7007 | int stage; |
| 7008 | int level; |
| 7009 | int shared_level; |
| 7010 | int update_ref; |
| 7011 | int keep_locks; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7012 | int reada_slot; |
| 7013 | int reada_count; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7014 | int for_reloc; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7015 | }; |
| 7016 | |
| 7017 | #define DROP_REFERENCE 1 |
| 7018 | #define UPDATE_BACKREF 2 |
| 7019 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7020 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
| 7021 | struct btrfs_root *root, |
| 7022 | struct walk_control *wc, |
| 7023 | struct btrfs_path *path) |
| 7024 | { |
| 7025 | u64 bytenr; |
| 7026 | u64 generation; |
| 7027 | u64 refs; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7028 | u64 flags; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7029 | u32 nritems; |
| 7030 | u32 blocksize; |
| 7031 | struct btrfs_key key; |
| 7032 | struct extent_buffer *eb; |
| 7033 | int ret; |
| 7034 | int slot; |
| 7035 | int nread = 0; |
| 7036 | |
| 7037 | if (path->slots[wc->level] < wc->reada_slot) { |
| 7038 | wc->reada_count = wc->reada_count * 2 / 3; |
| 7039 | wc->reada_count = max(wc->reada_count, 2); |
| 7040 | } else { |
| 7041 | wc->reada_count = wc->reada_count * 3 / 2; |
| 7042 | wc->reada_count = min_t(int, wc->reada_count, |
| 7043 | BTRFS_NODEPTRS_PER_BLOCK(root)); |
| 7044 | } |
| 7045 | |
| 7046 | eb = path->nodes[wc->level]; |
| 7047 | nritems = btrfs_header_nritems(eb); |
| 7048 | blocksize = btrfs_level_size(root, wc->level - 1); |
| 7049 | |
| 7050 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
| 7051 | if (nread >= wc->reada_count) |
| 7052 | break; |
| 7053 | |
| 7054 | cond_resched(); |
| 7055 | bytenr = btrfs_node_blockptr(eb, slot); |
| 7056 | generation = btrfs_node_ptr_generation(eb, slot); |
| 7057 | |
| 7058 | if (slot == path->slots[wc->level]) |
| 7059 | goto reada; |
| 7060 | |
| 7061 | if (wc->stage == UPDATE_BACKREF && |
| 7062 | generation <= root->root_key.offset) |
| 7063 | continue; |
| 7064 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7065 | /* 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] | 7066 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
| 7067 | wc->level - 1, 1, &refs, |
| 7068 | &flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7069 | /* We don't care about errors in readahead. */ |
| 7070 | if (ret < 0) |
| 7071 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7072 | BUG_ON(refs == 0); |
| 7073 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7074 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7075 | if (refs == 1) |
| 7076 | goto reada; |
| 7077 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7078 | if (wc->level == 1 && |
| 7079 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7080 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7081 | if (!wc->update_ref || |
| 7082 | generation <= root->root_key.offset) |
| 7083 | continue; |
| 7084 | btrfs_node_key_to_cpu(eb, &key, slot); |
| 7085 | ret = btrfs_comp_cpu_keys(&key, |
| 7086 | &wc->update_progress); |
| 7087 | if (ret < 0) |
| 7088 | continue; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7089 | } else { |
| 7090 | if (wc->level == 1 && |
| 7091 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7092 | continue; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7093 | } |
| 7094 | reada: |
| 7095 | ret = readahead_tree_block(root, bytenr, blocksize, |
| 7096 | generation); |
| 7097 | if (ret) |
| 7098 | break; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7099 | nread++; |
| 7100 | } |
| 7101 | wc->reada_slot = slot; |
| 7102 | } |
| 7103 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7104 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7105 | * helper to process tree block while walking down the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7106 | * |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7107 | * when wc->stage == UPDATE_BACKREF, this function updates |
| 7108 | * back refs for pointers in the block. |
| 7109 | * |
| 7110 | * NOTE: return value 1 means we should stop walking down. |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7111 | */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7112 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
| 7113 | struct btrfs_root *root, |
| 7114 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7115 | struct walk_control *wc, int lookup_info) |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7116 | { |
| 7117 | int level = wc->level; |
| 7118 | struct extent_buffer *eb = path->nodes[level]; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7119 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7120 | int ret; |
| 7121 | |
| 7122 | if (wc->stage == UPDATE_BACKREF && |
| 7123 | btrfs_header_owner(eb) != root->root_key.objectid) |
| 7124 | return 1; |
| 7125 | |
| 7126 | /* |
| 7127 | * when reference count of tree block is 1, it won't increase |
| 7128 | * again. once full backref flag is set, we never clear it. |
| 7129 | */ |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7130 | if (lookup_info && |
| 7131 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || |
| 7132 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7133 | BUG_ON(!path->locks[level]); |
| 7134 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7135 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7136 | &wc->refs[level], |
| 7137 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7138 | BUG_ON(ret == -ENOMEM); |
| 7139 | if (ret) |
| 7140 | return ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7141 | BUG_ON(wc->refs[level] == 0); |
| 7142 | } |
| 7143 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7144 | if (wc->stage == DROP_REFERENCE) { |
| 7145 | if (wc->refs[level] > 1) |
| 7146 | return 1; |
| 7147 | |
| 7148 | if (path->locks[level] && !wc->keep_locks) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7149 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7150 | path->locks[level] = 0; |
| 7151 | } |
| 7152 | return 0; |
| 7153 | } |
| 7154 | |
| 7155 | /* wc->stage == UPDATE_BACKREF */ |
| 7156 | if (!(wc->flags[level] & flag)) { |
| 7157 | BUG_ON(!path->locks[level]); |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7158 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7159 | BUG_ON(ret); /* -ENOMEM */ |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7160 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7161 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7162 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
Josef Bacik | b1c79e0 | 2013-05-09 13:49:30 -0400 | [diff] [blame] | 7163 | eb->len, flag, |
| 7164 | btrfs_header_level(eb), 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7165 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7166 | wc->flags[level] |= flag; |
| 7167 | } |
| 7168 | |
| 7169 | /* |
| 7170 | * the block is shared by multiple trees, so it's not good to |
| 7171 | * keep the tree lock |
| 7172 | */ |
| 7173 | if (path->locks[level] && level > 0) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7174 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7175 | path->locks[level] = 0; |
| 7176 | } |
| 7177 | return 0; |
| 7178 | } |
| 7179 | |
| 7180 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7181 | * helper to process tree block pointer. |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7182 | * |
| 7183 | * when wc->stage == DROP_REFERENCE, this function checks |
| 7184 | * reference count of the block pointed to. if the block |
| 7185 | * is shared and we need update back refs for the subtree |
| 7186 | * rooted at the block, this function changes wc->stage to |
| 7187 | * UPDATE_BACKREF. if the block is shared and there is no |
| 7188 | * need to update back, this function drops the reference |
| 7189 | * to the block. |
| 7190 | * |
| 7191 | * NOTE: return value 1 means we should stop walking down. |
| 7192 | */ |
| 7193 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, |
| 7194 | struct btrfs_root *root, |
| 7195 | struct btrfs_path *path, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7196 | struct walk_control *wc, int *lookup_info) |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7197 | { |
| 7198 | u64 bytenr; |
| 7199 | u64 generation; |
| 7200 | u64 parent; |
| 7201 | u32 blocksize; |
| 7202 | struct btrfs_key key; |
| 7203 | struct extent_buffer *next; |
| 7204 | int level = wc->level; |
| 7205 | int reada = 0; |
| 7206 | int ret = 0; |
| 7207 | |
| 7208 | generation = btrfs_node_ptr_generation(path->nodes[level], |
| 7209 | path->slots[level]); |
| 7210 | /* |
| 7211 | * if the lower level block was created before the snapshot |
| 7212 | * was created, we know there is no need to update back refs |
| 7213 | * for the subtree |
| 7214 | */ |
| 7215 | if (wc->stage == UPDATE_BACKREF && |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7216 | generation <= root->root_key.offset) { |
| 7217 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7218 | return 1; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7219 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7220 | |
| 7221 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); |
| 7222 | blocksize = btrfs_level_size(root, level - 1); |
| 7223 | |
| 7224 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
| 7225 | if (!next) { |
| 7226 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 7227 | if (!next) |
| 7228 | return -ENOMEM; |
Josef Bacik | b2aaaa3 | 2013-07-05 17:05:38 -0400 | [diff] [blame] | 7229 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
| 7230 | level - 1); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7231 | reada = 1; |
| 7232 | } |
| 7233 | btrfs_tree_lock(next); |
| 7234 | btrfs_set_lock_blocking(next); |
| 7235 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7236 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7237 | &wc->refs[level - 1], |
| 7238 | &wc->flags[level - 1]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7239 | if (ret < 0) { |
| 7240 | btrfs_tree_unlock(next); |
| 7241 | return ret; |
| 7242 | } |
| 7243 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 7244 | if (unlikely(wc->refs[level - 1] == 0)) { |
| 7245 | btrfs_err(root->fs_info, "Missing references."); |
| 7246 | BUG(); |
| 7247 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7248 | *lookup_info = 0; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7249 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7250 | if (wc->stage == DROP_REFERENCE) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7251 | if (wc->refs[level - 1] > 1) { |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7252 | if (level == 1 && |
| 7253 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7254 | goto skip; |
| 7255 | |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7256 | if (!wc->update_ref || |
| 7257 | generation <= root->root_key.offset) |
| 7258 | goto skip; |
| 7259 | |
| 7260 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
| 7261 | path->slots[level]); |
| 7262 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); |
| 7263 | if (ret < 0) |
| 7264 | goto skip; |
| 7265 | |
| 7266 | wc->stage = UPDATE_BACKREF; |
| 7267 | wc->shared_level = level - 1; |
| 7268 | } |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7269 | } else { |
| 7270 | if (level == 1 && |
| 7271 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 7272 | goto skip; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7273 | } |
| 7274 | |
Chris Mason | b9fab91 | 2012-05-06 07:23:47 -0400 | [diff] [blame] | 7275 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7276 | btrfs_tree_unlock(next); |
| 7277 | free_extent_buffer(next); |
| 7278 | next = NULL; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7279 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7280 | } |
| 7281 | |
| 7282 | if (!next) { |
| 7283 | if (reada && level == 1) |
| 7284 | reada_walk_down(trans, root, wc, path); |
| 7285 | next = read_tree_block(root, bytenr, blocksize, generation); |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 7286 | if (!next || !extent_buffer_uptodate(next)) { |
| 7287 | free_extent_buffer(next); |
Tsutomu Itoh | 97d9a8a | 2011-03-24 06:33:21 +0000 | [diff] [blame] | 7288 | return -EIO; |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 7289 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7290 | btrfs_tree_lock(next); |
| 7291 | btrfs_set_lock_blocking(next); |
| 7292 | } |
| 7293 | |
| 7294 | level--; |
| 7295 | BUG_ON(level != btrfs_header_level(next)); |
| 7296 | path->nodes[level] = next; |
| 7297 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7298 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7299 | wc->level = level; |
| 7300 | if (wc->level == 1) |
| 7301 | wc->reada_slot = 0; |
| 7302 | return 0; |
| 7303 | skip: |
| 7304 | wc->refs[level - 1] = 0; |
| 7305 | wc->flags[level - 1] = 0; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7306 | if (wc->stage == DROP_REFERENCE) { |
| 7307 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| 7308 | parent = path->nodes[level]->start; |
| 7309 | } else { |
| 7310 | BUG_ON(root->root_key.objectid != |
| 7311 | btrfs_header_owner(path->nodes[level])); |
| 7312 | parent = 0; |
| 7313 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7314 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7315 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7316 | root->root_key.objectid, level - 1, 0, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7317 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7318 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7319 | btrfs_tree_unlock(next); |
| 7320 | free_extent_buffer(next); |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7321 | *lookup_info = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7322 | return 1; |
| 7323 | } |
| 7324 | |
| 7325 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 7326 | * helper to process tree block while walking up the tree. |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7327 | * |
| 7328 | * when wc->stage == DROP_REFERENCE, this function drops |
| 7329 | * reference count on the block. |
| 7330 | * |
| 7331 | * when wc->stage == UPDATE_BACKREF, this function changes |
| 7332 | * wc->stage back to DROP_REFERENCE if we changed wc->stage |
| 7333 | * to UPDATE_BACKREF previously while processing the block. |
| 7334 | * |
| 7335 | * NOTE: return value 1 means we should stop walking up. |
| 7336 | */ |
| 7337 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, |
| 7338 | struct btrfs_root *root, |
| 7339 | struct btrfs_path *path, |
| 7340 | struct walk_control *wc) |
| 7341 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7342 | int ret; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7343 | int level = wc->level; |
| 7344 | struct extent_buffer *eb = path->nodes[level]; |
| 7345 | u64 parent = 0; |
| 7346 | |
| 7347 | if (wc->stage == UPDATE_BACKREF) { |
| 7348 | BUG_ON(wc->shared_level < level); |
| 7349 | if (level < wc->shared_level) |
| 7350 | goto out; |
| 7351 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7352 | ret = find_next_key(path, level + 1, &wc->update_progress); |
| 7353 | if (ret > 0) |
| 7354 | wc->update_ref = 0; |
| 7355 | |
| 7356 | wc->stage = DROP_REFERENCE; |
| 7357 | wc->shared_level = -1; |
| 7358 | path->slots[level] = 0; |
| 7359 | |
| 7360 | /* |
| 7361 | * check reference count again if the block isn't locked. |
| 7362 | * we should start walking down the tree again if reference |
| 7363 | * count is one. |
| 7364 | */ |
| 7365 | if (!path->locks[level]) { |
| 7366 | BUG_ON(level == 0); |
| 7367 | btrfs_tree_lock(eb); |
| 7368 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7369 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7370 | |
| 7371 | ret = btrfs_lookup_extent_info(trans, root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7372 | eb->start, level, 1, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7373 | &wc->refs[level], |
| 7374 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7375 | if (ret < 0) { |
| 7376 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 7377 | path->locks[level] = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7378 | return ret; |
| 7379 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7380 | BUG_ON(wc->refs[level] == 0); |
| 7381 | if (wc->refs[level] == 1) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7382 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
Liu Bo | 3268a24 | 2012-12-28 09:33:19 +0000 | [diff] [blame] | 7383 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7384 | return 1; |
| 7385 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7386 | } |
| 7387 | } |
| 7388 | |
| 7389 | /* wc->stage == DROP_REFERENCE */ |
| 7390 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); |
| 7391 | |
| 7392 | if (wc->refs[level] == 1) { |
| 7393 | if (level == 0) { |
| 7394 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7395 | ret = btrfs_dec_ref(trans, root, eb, 1, |
| 7396 | wc->for_reloc); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7397 | else |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7398 | ret = btrfs_dec_ref(trans, root, eb, 0, |
| 7399 | wc->for_reloc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7400 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7401 | } |
| 7402 | /* make block locked assertion in clean_tree_block happy */ |
| 7403 | if (!path->locks[level] && |
| 7404 | btrfs_header_generation(eb) == trans->transid) { |
| 7405 | btrfs_tree_lock(eb); |
| 7406 | btrfs_set_lock_blocking(eb); |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7407 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7408 | } |
| 7409 | clean_tree_block(trans, root, eb); |
| 7410 | } |
| 7411 | |
| 7412 | if (eb == root->node) { |
| 7413 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 7414 | parent = eb->start; |
| 7415 | else |
| 7416 | BUG_ON(root->root_key.objectid != |
| 7417 | btrfs_header_owner(eb)); |
| 7418 | } else { |
| 7419 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 7420 | parent = path->nodes[level + 1]->start; |
| 7421 | else |
| 7422 | BUG_ON(root->root_key.objectid != |
| 7423 | btrfs_header_owner(path->nodes[level + 1])); |
| 7424 | } |
| 7425 | |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 7426 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7427 | out: |
| 7428 | wc->refs[level] = 0; |
| 7429 | wc->flags[level] = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7430 | return 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7431 | } |
| 7432 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7433 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
| 7434 | struct btrfs_root *root, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7435 | struct btrfs_path *path, |
| 7436 | struct walk_control *wc) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7437 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7438 | int level = wc->level; |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7439 | int lookup_info = 1; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7440 | int ret; |
| 7441 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7442 | while (level >= 0) { |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7443 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7444 | if (ret > 0) |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7445 | break; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7446 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7447 | if (level == 0) |
| 7448 | break; |
| 7449 | |
Yan, Zheng | 7a7965f | 2010-02-01 02:41:17 +0000 | [diff] [blame] | 7450 | if (path->slots[level] >= |
| 7451 | btrfs_header_nritems(path->nodes[level])) |
| 7452 | break; |
| 7453 | |
Yan, Zheng | 94fcca9 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 7454 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7455 | if (ret > 0) { |
| 7456 | path->slots[level]++; |
| 7457 | continue; |
Miao Xie | 90d2c51d | 2010-03-25 12:37:12 +0000 | [diff] [blame] | 7458 | } else if (ret < 0) |
| 7459 | return ret; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7460 | level = wc->level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7461 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7462 | return 0; |
| 7463 | } |
| 7464 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7465 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 7466 | struct btrfs_root *root, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7467 | struct btrfs_path *path, |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7468 | struct walk_control *wc, int max_level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7469 | { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7470 | int level = wc->level; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7471 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7472 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7473 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
| 7474 | while (level < max_level && path->nodes[level]) { |
| 7475 | wc->level = level; |
| 7476 | if (path->slots[level] + 1 < |
| 7477 | btrfs_header_nritems(path->nodes[level])) { |
| 7478 | path->slots[level]++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7479 | return 0; |
| 7480 | } else { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7481 | ret = walk_up_proc(trans, root, path, wc); |
| 7482 | if (ret > 0) |
| 7483 | return 0; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 7484 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7485 | if (path->locks[level]) { |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7486 | btrfs_tree_unlock_rw(path->nodes[level], |
| 7487 | path->locks[level]); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7488 | path->locks[level] = 0; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7489 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7490 | free_extent_buffer(path->nodes[level]); |
| 7491 | path->nodes[level] = NULL; |
| 7492 | level++; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7493 | } |
| 7494 | } |
| 7495 | return 1; |
| 7496 | } |
| 7497 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7498 | /* |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7499 | * drop a subvolume tree. |
| 7500 | * |
| 7501 | * this function traverses the tree freeing any blocks that only |
| 7502 | * referenced by the tree. |
| 7503 | * |
| 7504 | * when a shared tree block is found. this function decreases its |
| 7505 | * reference count by one. if update_ref is true, this function |
| 7506 | * also make sure backrefs for the shared block and all lower level |
| 7507 | * blocks are properly updated. |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 7508 | * |
| 7509 | * If called with for_reloc == 0, may exit early with -EAGAIN |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7510 | */ |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 7511 | int btrfs_drop_snapshot(struct btrfs_root *root, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7512 | struct btrfs_block_rsv *block_rsv, int update_ref, |
| 7513 | int for_reloc) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7514 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 7515 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7516 | struct btrfs_trans_handle *trans; |
| 7517 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7518 | struct btrfs_root_item *root_item = &root->root_item; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7519 | struct walk_control *wc; |
| 7520 | struct btrfs_key key; |
| 7521 | int err = 0; |
| 7522 | int ret; |
| 7523 | int level; |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 7524 | bool root_dropped = false; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7525 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 7526 | path = btrfs_alloc_path(); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7527 | if (!path) { |
| 7528 | err = -ENOMEM; |
| 7529 | goto out; |
| 7530 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7531 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7532 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 7533 | if (!wc) { |
| 7534 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7535 | err = -ENOMEM; |
| 7536 | goto out; |
Mark Fasheh | 38a1a91 | 2011-07-13 10:59:59 -0700 | [diff] [blame] | 7537 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7538 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7539 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7540 | if (IS_ERR(trans)) { |
| 7541 | err = PTR_ERR(trans); |
| 7542 | goto out_free; |
| 7543 | } |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 7544 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7545 | if (block_rsv) |
| 7546 | trans->block_rsv = block_rsv; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7547 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7548 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7549 | level = btrfs_header_level(root->node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7550 | path->nodes[level] = btrfs_lock_root_node(root); |
| 7551 | btrfs_set_lock_blocking(path->nodes[level]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7552 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7553 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7554 | memset(&wc->update_progress, 0, |
| 7555 | sizeof(wc->update_progress)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7556 | } else { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7557 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7558 | memcpy(&wc->update_progress, &key, |
| 7559 | sizeof(wc->update_progress)); |
| 7560 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 7561 | level = root_item->drop_level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7562 | BUG_ON(level == 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 7563 | path->lowest_level = level; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7564 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 7565 | path->lowest_level = 0; |
| 7566 | if (ret < 0) { |
| 7567 | err = ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7568 | goto out_end_trans; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 7569 | } |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7570 | WARN_ON(ret > 0); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7571 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 7572 | /* |
| 7573 | * unlock our path, this is safe because only this |
| 7574 | * function is allowed to delete this snapshot |
| 7575 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7576 | btrfs_unlock_up_safe(path, 0); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 7577 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7578 | level = btrfs_header_level(root->node); |
| 7579 | while (1) { |
| 7580 | btrfs_tree_lock(path->nodes[level]); |
| 7581 | btrfs_set_lock_blocking(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 7582 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7583 | |
| 7584 | ret = btrfs_lookup_extent_info(trans, root, |
| 7585 | path->nodes[level]->start, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 7586 | level, 1, &wc->refs[level], |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7587 | &wc->flags[level]); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7588 | if (ret < 0) { |
| 7589 | err = ret; |
| 7590 | goto out_end_trans; |
| 7591 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7592 | BUG_ON(wc->refs[level] == 0); |
| 7593 | |
| 7594 | if (level == root_item->drop_level) |
| 7595 | break; |
| 7596 | |
| 7597 | btrfs_tree_unlock(path->nodes[level]); |
Josef Bacik | fec386a | 2013-07-15 12:41:42 -0400 | [diff] [blame] | 7598 | path->locks[level] = 0; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7599 | WARN_ON(wc->refs[level] != 1); |
| 7600 | level--; |
| 7601 | } |
| 7602 | } |
| 7603 | |
| 7604 | wc->level = level; |
| 7605 | wc->shared_level = -1; |
| 7606 | wc->stage = DROP_REFERENCE; |
| 7607 | wc->update_ref = update_ref; |
| 7608 | wc->keep_locks = 0; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7609 | wc->for_reloc = for_reloc; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7610 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7611 | |
| 7612 | while (1) { |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 7613 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7614 | ret = walk_down_tree(trans, root, path, wc); |
| 7615 | if (ret < 0) { |
| 7616 | err = ret; |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 7617 | break; |
| 7618 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7619 | |
| 7620 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
| 7621 | if (ret < 0) { |
| 7622 | err = ret; |
| 7623 | break; |
| 7624 | } |
| 7625 | |
| 7626 | if (ret > 0) { |
| 7627 | BUG_ON(wc->stage != DROP_REFERENCE); |
| 7628 | break; |
| 7629 | } |
| 7630 | |
| 7631 | if (wc->stage == DROP_REFERENCE) { |
| 7632 | level = wc->level; |
| 7633 | btrfs_node_key(path->nodes[level], |
| 7634 | &root_item->drop_progress, |
| 7635 | path->slots[level]); |
| 7636 | root_item->drop_level = level; |
| 7637 | } |
| 7638 | |
| 7639 | BUG_ON(wc->level == 0); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 7640 | if (btrfs_should_end_transaction(trans, tree_root) || |
| 7641 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7642 | ret = btrfs_update_root(trans, tree_root, |
| 7643 | &root->root_key, |
| 7644 | root_item); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7645 | if (ret) { |
| 7646 | btrfs_abort_transaction(trans, tree_root, ret); |
| 7647 | err = ret; |
| 7648 | goto out_end_trans; |
| 7649 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7650 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7651 | btrfs_end_transaction_throttle(trans, tree_root); |
Josef Bacik | 3c8f242 | 2013-07-15 11:57:06 -0400 | [diff] [blame] | 7652 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
| 7653 | pr_debug("btrfs: drop snapshot early exit\n"); |
| 7654 | err = -EAGAIN; |
| 7655 | goto out_free; |
| 7656 | } |
| 7657 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7658 | trans = btrfs_start_transaction(tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7659 | if (IS_ERR(trans)) { |
| 7660 | err = PTR_ERR(trans); |
| 7661 | goto out_free; |
| 7662 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7663 | if (block_rsv) |
| 7664 | trans->block_rsv = block_rsv; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 7665 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7666 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 7667 | btrfs_release_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7668 | if (err) |
| 7669 | goto out_end_trans; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7670 | |
| 7671 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7672 | if (ret) { |
| 7673 | btrfs_abort_transaction(trans, tree_root, ret); |
| 7674 | goto out_end_trans; |
| 7675 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7676 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7677 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 7678 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
| 7679 | NULL, NULL); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7680 | if (ret < 0) { |
| 7681 | btrfs_abort_transaction(trans, tree_root, ret); |
| 7682 | err = ret; |
| 7683 | goto out_end_trans; |
| 7684 | } else if (ret > 0) { |
Josef Bacik | 84cd948 | 2010-12-08 12:24:01 -0500 | [diff] [blame] | 7685 | /* if we fail to delete the orphan item this time |
| 7686 | * around, it'll get picked up the next time. |
| 7687 | * |
| 7688 | * The most common failure here is just -ENOENT. |
| 7689 | */ |
| 7690 | btrfs_del_orphan_item(trans, tree_root, |
| 7691 | root->root_key.objectid); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7692 | } |
| 7693 | } |
| 7694 | |
| 7695 | if (root->in_radix) { |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 7696 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7697 | } else { |
| 7698 | free_extent_buffer(root->node); |
| 7699 | free_extent_buffer(root->commit_root); |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 7700 | btrfs_put_fs_root(root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7701 | } |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 7702 | root_dropped = true; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7703 | out_end_trans: |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7704 | btrfs_end_transaction_throttle(trans, tree_root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7705 | out_free: |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7706 | kfree(wc); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 7707 | btrfs_free_path(path); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7708 | out: |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 7709 | /* |
| 7710 | * So if we need to stop dropping the snapshot for whatever reason we |
| 7711 | * need to make sure to add it back to the dead root list so that we |
| 7712 | * keep trying to do the work later. This also cleans up roots if we |
| 7713 | * don't have it in the radix (like when we recover after a power fail |
| 7714 | * or unmount) so we don't leak memory. |
| 7715 | */ |
Josef Bacik | b37b39c | 2013-07-23 16:57:15 -0400 | [diff] [blame] | 7716 | if (!for_reloc && root_dropped == false) |
Josef Bacik | d29a9f6 | 2013-07-17 19:30:20 -0400 | [diff] [blame] | 7717 | btrfs_add_dead_root(root); |
Tsutomu Itoh | cb1b69f | 2011-08-09 07:11:13 +0000 | [diff] [blame] | 7718 | if (err) |
| 7719 | btrfs_std_error(root->fs_info, err); |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 7720 | return err; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 7721 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 7722 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7723 | /* |
| 7724 | * drop subtree rooted at tree block 'node'. |
| 7725 | * |
| 7726 | * NOTE: this function will unlock and release tree block 'node' |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7727 | * only used by relocation code |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7728 | */ |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7729 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| 7730 | struct btrfs_root *root, |
| 7731 | struct extent_buffer *node, |
| 7732 | struct extent_buffer *parent) |
| 7733 | { |
| 7734 | struct btrfs_path *path; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7735 | struct walk_control *wc; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7736 | int level; |
| 7737 | int parent_level; |
| 7738 | int ret = 0; |
| 7739 | int wret; |
| 7740 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7741 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 7742 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7743 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 7744 | if (!path) |
| 7745 | return -ENOMEM; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7746 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7747 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 7748 | if (!wc) { |
| 7749 | btrfs_free_path(path); |
| 7750 | return -ENOMEM; |
| 7751 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7752 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 7753 | btrfs_assert_tree_locked(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7754 | parent_level = btrfs_header_level(parent); |
| 7755 | extent_buffer_get(parent); |
| 7756 | path->nodes[parent_level] = parent; |
| 7757 | path->slots[parent_level] = btrfs_header_nritems(parent); |
| 7758 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 7759 | btrfs_assert_tree_locked(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7760 | level = btrfs_header_level(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7761 | path->nodes[level] = node; |
| 7762 | path->slots[level] = 0; |
Chris Mason | bd68151 | 2011-07-16 15:23:14 -0400 | [diff] [blame] | 7763 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7764 | |
| 7765 | wc->refs[parent_level] = 1; |
| 7766 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| 7767 | wc->level = level; |
| 7768 | wc->shared_level = -1; |
| 7769 | wc->stage = DROP_REFERENCE; |
| 7770 | wc->update_ref = 0; |
| 7771 | wc->keep_locks = 1; |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 7772 | wc->for_reloc = 1; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 7773 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7774 | |
| 7775 | while (1) { |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7776 | wret = walk_down_tree(trans, root, path, wc); |
| 7777 | if (wret < 0) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7778 | ret = wret; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7779 | break; |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7780 | } |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7781 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7782 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7783 | if (wret < 0) |
| 7784 | ret = wret; |
| 7785 | if (wret != 0) |
| 7786 | break; |
| 7787 | } |
| 7788 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 7789 | kfree(wc); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 7790 | btrfs_free_path(path); |
| 7791 | return ret; |
| 7792 | } |
| 7793 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7794 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 7795 | { |
| 7796 | u64 num_devices; |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 7797 | u64 stripped; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7798 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 7799 | /* |
| 7800 | * if restripe for this chunk_type is on pick target profile and |
| 7801 | * return, otherwise do the usual balance |
| 7802 | */ |
| 7803 | stripped = get_restripe_target(root->fs_info, flags); |
| 7804 | if (stripped) |
| 7805 | return extended_to_chunk(stripped); |
Ilya Dryomov | e4d8ec0 | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 7806 | |
Chris Mason | cd02dca | 2010-12-13 14:56:23 -0500 | [diff] [blame] | 7807 | /* |
| 7808 | * we add in the count of missing devices because we want |
| 7809 | * to make sure that any RAID levels on a degraded FS |
| 7810 | * continue to be honored. |
| 7811 | */ |
| 7812 | num_devices = root->fs_info->fs_devices->rw_devices + |
| 7813 | root->fs_info->fs_devices->missing_devices; |
| 7814 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 7815 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 7816 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
Ilya Dryomov | fc67c45 | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 7817 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 7818 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7819 | if (num_devices == 1) { |
| 7820 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 7821 | stripped = flags & ~stripped; |
| 7822 | |
| 7823 | /* turn raid0 into single device chunks */ |
| 7824 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 7825 | return stripped; |
| 7826 | |
| 7827 | /* turn mirroring into duplication */ |
| 7828 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 7829 | BTRFS_BLOCK_GROUP_RAID10)) |
| 7830 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7831 | } else { |
| 7832 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7833 | if (flags & stripped) |
| 7834 | return flags; |
| 7835 | |
| 7836 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 7837 | stripped = flags & ~stripped; |
| 7838 | |
| 7839 | /* switch duplicated blocks with raid1 */ |
| 7840 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 7841 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 7842 | |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 7843 | /* this is drive concat, leave it alone */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7844 | } |
Ilya Dryomov | e3176ca | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 7845 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 7846 | return flags; |
| 7847 | } |
| 7848 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 7849 | 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] | 7850 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7851 | struct btrfs_space_info *sinfo = cache->space_info; |
| 7852 | u64 num_bytes; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 7853 | u64 min_allocable_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7854 | int ret = -ENOSPC; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 7855 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 7856 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 7857 | /* |
| 7858 | * We need some metadata space and system metadata space for |
| 7859 | * allocating chunks in some corner cases until we force to set |
| 7860 | * it to be readonly. |
| 7861 | */ |
| 7862 | if ((sinfo->flags & |
| 7863 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && |
| 7864 | !force) |
| 7865 | min_allocable_bytes = 1 * 1024 * 1024; |
| 7866 | else |
| 7867 | min_allocable_bytes = 0; |
| 7868 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7869 | spin_lock(&sinfo->lock); |
| 7870 | spin_lock(&cache->lock); |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 7871 | |
| 7872 | if (cache->ro) { |
| 7873 | ret = 0; |
| 7874 | goto out; |
| 7875 | } |
| 7876 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7877 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 7878 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 7879 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7880 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + |
Josef Bacik | 37be25b | 2011-08-05 10:25:38 -0400 | [diff] [blame] | 7881 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
| 7882 | min_allocable_bytes <= sinfo->total_bytes) { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7883 | sinfo->bytes_readonly += num_bytes; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7884 | cache->ro = 1; |
| 7885 | ret = 0; |
| 7886 | } |
WuBo | 61cfea9 | 2011-07-26 03:30:11 +0000 | [diff] [blame] | 7887 | out: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7888 | spin_unlock(&cache->lock); |
| 7889 | spin_unlock(&sinfo->lock); |
| 7890 | return ret; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 7891 | } |
| 7892 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7893 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
| 7894 | struct btrfs_block_group_cache *cache) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7895 | |
| 7896 | { |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7897 | struct btrfs_trans_handle *trans; |
| 7898 | u64 alloc_flags; |
| 7899 | int ret; |
| 7900 | |
| 7901 | BUG_ON(cache->ro); |
| 7902 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 7903 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7904 | if (IS_ERR(trans)) |
| 7905 | return PTR_ERR(trans); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7906 | |
| 7907 | alloc_flags = update_block_group_flags(root, cache->flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7908 | if (alloc_flags != cache->flags) { |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 7909 | ret = do_chunk_alloc(trans, root, alloc_flags, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7910 | CHUNK_ALLOC_FORCE); |
| 7911 | if (ret < 0) |
| 7912 | goto out; |
| 7913 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7914 | |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 7915 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7916 | if (!ret) |
| 7917 | goto out; |
| 7918 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 7919 | ret = do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 7920 | CHUNK_ALLOC_FORCE); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7921 | if (ret < 0) |
| 7922 | goto out; |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 7923 | ret = set_block_group_ro(cache, 0); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7924 | out: |
| 7925 | btrfs_end_transaction(trans, root); |
| 7926 | return ret; |
| 7927 | } |
| 7928 | |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 7929 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
| 7930 | struct btrfs_root *root, u64 type) |
| 7931 | { |
| 7932 | u64 alloc_flags = get_alloc_profile(root, type); |
Josef Bacik | 698d008 | 2012-09-12 14:08:47 -0400 | [diff] [blame] | 7933 | return do_chunk_alloc(trans, root, alloc_flags, |
Chris Mason | 0e4f8f8 | 2011-04-15 16:05:44 -0400 | [diff] [blame] | 7934 | CHUNK_ALLOC_FORCE); |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 7935 | } |
| 7936 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 7937 | /* |
| 7938 | * helper to account the unused space of all the readonly block group in the |
| 7939 | * list. takes mirrors into account. |
| 7940 | */ |
| 7941 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) |
| 7942 | { |
| 7943 | struct btrfs_block_group_cache *block_group; |
| 7944 | u64 free_bytes = 0; |
| 7945 | int factor; |
| 7946 | |
| 7947 | list_for_each_entry(block_group, groups_list, list) { |
| 7948 | spin_lock(&block_group->lock); |
| 7949 | |
| 7950 | if (!block_group->ro) { |
| 7951 | spin_unlock(&block_group->lock); |
| 7952 | continue; |
| 7953 | } |
| 7954 | |
| 7955 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 7956 | BTRFS_BLOCK_GROUP_RAID10 | |
| 7957 | BTRFS_BLOCK_GROUP_DUP)) |
| 7958 | factor = 2; |
| 7959 | else |
| 7960 | factor = 1; |
| 7961 | |
| 7962 | free_bytes += (block_group->key.offset - |
| 7963 | btrfs_block_group_used(&block_group->item)) * |
| 7964 | factor; |
| 7965 | |
| 7966 | spin_unlock(&block_group->lock); |
| 7967 | } |
| 7968 | |
| 7969 | return free_bytes; |
| 7970 | } |
| 7971 | |
| 7972 | /* |
| 7973 | * helper to account the unused space of all the readonly block group in the |
| 7974 | * space_info. takes mirrors into account. |
| 7975 | */ |
| 7976 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
| 7977 | { |
| 7978 | int i; |
| 7979 | u64 free_bytes = 0; |
| 7980 | |
| 7981 | spin_lock(&sinfo->lock); |
| 7982 | |
| 7983 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
| 7984 | if (!list_empty(&sinfo->block_groups[i])) |
| 7985 | free_bytes += __btrfs_get_ro_block_group_free_space( |
| 7986 | &sinfo->block_groups[i]); |
| 7987 | |
| 7988 | spin_unlock(&sinfo->lock); |
| 7989 | |
| 7990 | return free_bytes; |
| 7991 | } |
| 7992 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 7993 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7994 | struct btrfs_block_group_cache *cache) |
| 7995 | { |
| 7996 | struct btrfs_space_info *sinfo = cache->space_info; |
| 7997 | u64 num_bytes; |
| 7998 | |
| 7999 | BUG_ON(!cache->ro); |
| 8000 | |
| 8001 | spin_lock(&sinfo->lock); |
| 8002 | spin_lock(&cache->lock); |
| 8003 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
| 8004 | cache->bytes_super - btrfs_block_group_used(&cache->item); |
| 8005 | sinfo->bytes_readonly -= num_bytes; |
| 8006 | cache->ro = 0; |
| 8007 | spin_unlock(&cache->lock); |
| 8008 | spin_unlock(&sinfo->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 8009 | } |
| 8010 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8011 | /* |
| 8012 | * checks to see if its even possible to relocate this block group. |
| 8013 | * |
| 8014 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its |
| 8015 | * ok to go ahead and try. |
| 8016 | */ |
| 8017 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8018 | { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8019 | struct btrfs_block_group_cache *block_group; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8020 | struct btrfs_space_info *space_info; |
| 8021 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 8022 | struct btrfs_device *device; |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8023 | struct btrfs_trans_handle *trans; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8024 | u64 min_free; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8025 | u64 dev_min = 1; |
| 8026 | u64 dev_nr = 0; |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8027 | u64 target; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8028 | int index; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8029 | int full = 0; |
| 8030 | int ret = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8031 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8032 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8033 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8034 | /* odd, couldn't find the block group, leave it alone */ |
| 8035 | if (!block_group) |
| 8036 | return -1; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8037 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8038 | min_free = btrfs_block_group_used(&block_group->item); |
| 8039 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8040 | /* no bytes used, we're good */ |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8041 | if (!min_free) |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8042 | goto out; |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8043 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8044 | space_info = block_group->space_info; |
| 8045 | spin_lock(&space_info->lock); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 8046 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8047 | full = space_info->full; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8048 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8049 | /* |
| 8050 | * 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] | 8051 | * relocate it unless we're able to allocate a new chunk below. |
| 8052 | * |
| 8053 | * Otherwise, we need to make sure we have room in the space to handle |
| 8054 | * 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] | 8055 | */ |
Chris Mason | 7ce618d | 2009-09-22 14:48:44 -0400 | [diff] [blame] | 8056 | if ((space_info->total_bytes != block_group->key.offset) && |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8057 | (space_info->bytes_used + space_info->bytes_reserved + |
| 8058 | space_info->bytes_pinned + space_info->bytes_readonly + |
| 8059 | min_free < space_info->total_bytes)) { |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8060 | spin_unlock(&space_info->lock); |
| 8061 | goto out; |
| 8062 | } |
| 8063 | spin_unlock(&space_info->lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8064 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8065 | /* |
| 8066 | * ok we don't have enough space, but maybe we have free space on our |
| 8067 | * devices to allocate new chunks for relocation, so loop through our |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8068 | * alloc devices and guess if we have enough space. if this block |
| 8069 | * group is going to be restriped, run checks against the target |
| 8070 | * profile instead of the current one. |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8071 | */ |
| 8072 | ret = -1; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 8073 | |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8074 | /* |
| 8075 | * index: |
| 8076 | * 0: raid10 |
| 8077 | * 1: raid1 |
| 8078 | * 2: dup |
| 8079 | * 3: raid0 |
| 8080 | * 4: single |
| 8081 | */ |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8082 | target = get_restripe_target(root->fs_info, block_group->flags); |
| 8083 | if (target) { |
Liu Bo | 31e5022 | 2012-11-21 14:18:10 +0000 | [diff] [blame] | 8084 | index = __get_raid_index(extended_to_chunk(target)); |
Ilya Dryomov | 4a5e98f | 2012-03-27 17:09:17 +0300 | [diff] [blame] | 8085 | } else { |
| 8086 | /* |
| 8087 | * this is just a balance, so if we were marked as full |
| 8088 | * we know there is no space for a new chunk |
| 8089 | */ |
| 8090 | if (full) |
| 8091 | goto out; |
| 8092 | |
| 8093 | index = get_block_group_index(block_group); |
| 8094 | } |
| 8095 | |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8096 | if (index == BTRFS_RAID_RAID10) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8097 | dev_min = 4; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8098 | /* Divide by 2 */ |
| 8099 | min_free >>= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8100 | } else if (index == BTRFS_RAID_RAID1) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8101 | dev_min = 2; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8102 | } else if (index == BTRFS_RAID_DUP) { |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8103 | /* Multiply by 2 */ |
| 8104 | min_free <<= 1; |
Miao Xie | e6ec716 | 2013-01-17 05:38:51 +0000 | [diff] [blame] | 8105 | } else if (index == BTRFS_RAID_RAID0) { |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8106 | dev_min = fs_devices->rw_devices; |
Josef Bacik | 6719db6 | 2011-08-20 08:29:51 -0400 | [diff] [blame] | 8107 | do_div(min_free, dev_min); |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8108 | } |
| 8109 | |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8110 | /* We need to do this so that we can look at pending chunks */ |
| 8111 | trans = btrfs_join_transaction(root); |
| 8112 | if (IS_ERR(trans)) { |
| 8113 | ret = PTR_ERR(trans); |
| 8114 | goto out; |
| 8115 | } |
| 8116 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8117 | mutex_lock(&root->fs_info->chunk_mutex); |
| 8118 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8119 | u64 dev_offset; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 8120 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8121 | /* |
| 8122 | * check to make sure we can actually find a chunk with enough |
| 8123 | * space to fit our block group in. |
| 8124 | */ |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 8125 | if (device->total_bytes > device->bytes_used + min_free && |
| 8126 | !device->is_tgtdev_for_dev_replace) { |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8127 | ret = find_free_dev_extent(trans, device, min_free, |
Miao Xie | 7bfc837 | 2011-01-05 10:07:26 +0000 | [diff] [blame] | 8128 | &dev_offset, NULL); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8129 | if (!ret) |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8130 | dev_nr++; |
| 8131 | |
| 8132 | if (dev_nr >= dev_min) |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8133 | break; |
liubo | cdcb725 | 2011-08-03 10:15:25 +0000 | [diff] [blame] | 8134 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8135 | ret = -1; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 8136 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8137 | } |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8138 | mutex_unlock(&root->fs_info->chunk_mutex); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8139 | btrfs_end_transaction(trans, root); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8140 | out: |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8141 | btrfs_put_block_group(block_group); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 8142 | return ret; |
| 8143 | } |
| 8144 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 8145 | static int find_first_block_group(struct btrfs_root *root, |
| 8146 | struct btrfs_path *path, struct btrfs_key *key) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8147 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8148 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8149 | struct btrfs_key found_key; |
| 8150 | struct extent_buffer *leaf; |
| 8151 | int slot; |
| 8152 | |
| 8153 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 8154 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8155 | goto out; |
| 8156 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 8157 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8158 | slot = path->slots[0]; |
| 8159 | leaf = path->nodes[0]; |
| 8160 | if (slot >= btrfs_header_nritems(leaf)) { |
| 8161 | ret = btrfs_next_leaf(root, path); |
| 8162 | if (ret == 0) |
| 8163 | continue; |
| 8164 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8165 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8166 | break; |
| 8167 | } |
| 8168 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 8169 | |
| 8170 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8171 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 8172 | ret = 0; |
| 8173 | goto out; |
| 8174 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8175 | path->slots[0]++; |
| 8176 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8177 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8178 | return ret; |
| 8179 | } |
| 8180 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8181 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
| 8182 | { |
| 8183 | struct btrfs_block_group_cache *block_group; |
| 8184 | u64 last = 0; |
| 8185 | |
| 8186 | while (1) { |
| 8187 | struct inode *inode; |
| 8188 | |
| 8189 | block_group = btrfs_lookup_first_block_group(info, last); |
| 8190 | while (block_group) { |
| 8191 | spin_lock(&block_group->lock); |
| 8192 | if (block_group->iref) |
| 8193 | break; |
| 8194 | spin_unlock(&block_group->lock); |
| 8195 | block_group = next_block_group(info->tree_root, |
| 8196 | block_group); |
| 8197 | } |
| 8198 | if (!block_group) { |
| 8199 | if (last == 0) |
| 8200 | break; |
| 8201 | last = 0; |
| 8202 | continue; |
| 8203 | } |
| 8204 | |
| 8205 | inode = block_group->inode; |
| 8206 | block_group->iref = 0; |
| 8207 | block_group->inode = NULL; |
| 8208 | spin_unlock(&block_group->lock); |
| 8209 | iput(inode); |
| 8210 | last = block_group->key.objectid + block_group->key.offset; |
| 8211 | btrfs_put_block_group(block_group); |
| 8212 | } |
| 8213 | } |
| 8214 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8215 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 8216 | { |
| 8217 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8218 | struct btrfs_space_info *space_info; |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8219 | struct btrfs_caching_control *caching_ctl; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8220 | struct rb_node *n; |
| 8221 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8222 | down_write(&info->extent_commit_sem); |
| 8223 | while (!list_empty(&info->caching_block_groups)) { |
| 8224 | caching_ctl = list_entry(info->caching_block_groups.next, |
| 8225 | struct btrfs_caching_control, list); |
| 8226 | list_del(&caching_ctl->list); |
| 8227 | put_caching_control(caching_ctl); |
| 8228 | } |
| 8229 | up_write(&info->extent_commit_sem); |
| 8230 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8231 | spin_lock(&info->block_group_cache_lock); |
| 8232 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { |
| 8233 | block_group = rb_entry(n, struct btrfs_block_group_cache, |
| 8234 | cache_node); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8235 | rb_erase(&block_group->cache_node, |
| 8236 | &info->block_group_cache_tree); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 8237 | spin_unlock(&info->block_group_cache_lock); |
| 8238 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8239 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8240 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8241 | up_write(&block_group->space_info->groups_sem); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 8242 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8243 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8244 | wait_block_group_cache_done(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8245 | |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8246 | /* |
| 8247 | * We haven't cached this block group, which means we could |
| 8248 | * possibly have excluded extents on this block group. |
| 8249 | */ |
Josef Bacik | 36cce92 | 2013-08-05 11:15:21 -0400 | [diff] [blame] | 8250 | if (block_group->cached == BTRFS_CACHE_NO || |
| 8251 | block_group->cached == BTRFS_CACHE_ERROR) |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8252 | free_excluded_extents(info->extent_root, block_group); |
| 8253 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8254 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 11dfe35 | 2009-11-13 20:12:59 +0000 | [diff] [blame] | 8255 | btrfs_put_block_group(block_group); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 8256 | |
| 8257 | spin_lock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8258 | } |
| 8259 | spin_unlock(&info->block_group_cache_lock); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8260 | |
| 8261 | /* now that all the block groups are freed, go through and |
| 8262 | * free all the space_info structs. This is only called during |
| 8263 | * the final stages of unmount, and so we know nobody is |
| 8264 | * using them. We call synchronize_rcu() once before we start, |
| 8265 | * just to be on the safe side. |
| 8266 | */ |
| 8267 | synchronize_rcu(); |
| 8268 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 8269 | release_global_block_rsv(info); |
| 8270 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8271 | while(!list_empty(&info->space_info)) { |
| 8272 | space_info = list_entry(info->space_info.next, |
| 8273 | struct btrfs_space_info, |
| 8274 | list); |
David Sterba | b069e0c | 2013-02-08 21:28:17 +0000 | [diff] [blame] | 8275 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
| 8276 | if (space_info->bytes_pinned > 0 || |
| 8277 | space_info->bytes_reserved > 0 || |
| 8278 | space_info->bytes_may_use > 0) { |
| 8279 | WARN_ON(1); |
| 8280 | dump_space_info(space_info, 0, 0); |
| 8281 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8282 | } |
Josef Bacik | b150a4f | 2013-06-19 15:00:04 -0400 | [diff] [blame] | 8283 | percpu_counter_destroy(&space_info->total_bytes_pinned); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 8284 | list_del(&space_info->list); |
| 8285 | kfree(space_info); |
| 8286 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8287 | return 0; |
| 8288 | } |
| 8289 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8290 | static void __link_block_group(struct btrfs_space_info *space_info, |
| 8291 | struct btrfs_block_group_cache *cache) |
| 8292 | { |
| 8293 | int index = get_block_group_index(cache); |
| 8294 | |
| 8295 | down_write(&space_info->groups_sem); |
| 8296 | list_add_tail(&cache->list, &space_info->block_groups[index]); |
| 8297 | up_write(&space_info->groups_sem); |
| 8298 | } |
| 8299 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8300 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 8301 | { |
| 8302 | struct btrfs_path *path; |
| 8303 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8304 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 8305 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8306 | struct btrfs_space_info *space_info; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8307 | struct btrfs_key key; |
| 8308 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8309 | struct extent_buffer *leaf; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8310 | int need_clear = 0; |
| 8311 | u64 cache_gen; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 8312 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 8313 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8314 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8315 | key.offset = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8316 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8317 | path = btrfs_alloc_path(); |
| 8318 | if (!path) |
| 8319 | return -ENOMEM; |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 8320 | path->reada = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8321 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 8322 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 8323 | if (btrfs_test_opt(root, SPACE_CACHE) && |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 8324 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8325 | need_clear = 1; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 8326 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 8327 | need_clear = 1; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8328 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 8329 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8330 | ret = find_first_block_group(root, path, &key); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8331 | if (ret > 0) |
| 8332 | break; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8333 | if (ret != 0) |
| 8334 | goto error; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8335 | leaf = path->nodes[0]; |
| 8336 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 8337 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8338 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8339 | ret = -ENOMEM; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8340 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8341 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8342 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
| 8343 | GFP_NOFS); |
| 8344 | if (!cache->free_space_ctl) { |
| 8345 | kfree(cache); |
| 8346 | ret = -ENOMEM; |
| 8347 | goto error; |
| 8348 | } |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 8349 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 8350 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 8351 | spin_lock_init(&cache->lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8352 | cache->fs_info = info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 8353 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 8354 | INIT_LIST_HEAD(&cache->cluster_list); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8355 | |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 8356 | if (need_clear) { |
| 8357 | /* |
| 8358 | * When we mount with old space cache, we need to |
| 8359 | * set BTRFS_DC_CLEAR and set dirty flag. |
| 8360 | * |
| 8361 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we |
| 8362 | * truncate the old free space cache inode and |
| 8363 | * setup a new one. |
| 8364 | * b) Setting 'dirty flag' makes sure that we flush |
| 8365 | * the new space cache info onto disk. |
| 8366 | */ |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8367 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
Liu Bo | cf7c1ef | 2012-07-06 03:31:34 -0600 | [diff] [blame] | 8368 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 8369 | cache->dirty = 1; |
| 8370 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8371 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 8372 | read_extent_buffer(leaf, &cache->item, |
| 8373 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 8374 | sizeof(cache->item)); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8375 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8376 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8377 | key.objectid = found_key.objectid + found_key.offset; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8378 | btrfs_release_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8379 | cache->flags = btrfs_block_group_flags(&cache->item); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8380 | cache->sectorsize = root->sectorsize; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8381 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
| 8382 | &root->fs_info->mapping_tree, |
| 8383 | found_key.objectid); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8384 | btrfs_init_free_space_ctl(cache); |
| 8385 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8386 | /* |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8387 | * We need to exclude the super stripes now so that the space |
| 8388 | * info has super bytes accounted for, otherwise we'll think |
| 8389 | * we have more space than we actually do. |
| 8390 | */ |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8391 | ret = exclude_super_stripes(root, cache); |
| 8392 | if (ret) { |
| 8393 | /* |
| 8394 | * We may have excluded something, so call this just in |
| 8395 | * case. |
| 8396 | */ |
| 8397 | free_excluded_extents(root, cache); |
| 8398 | kfree(cache->free_space_ctl); |
| 8399 | kfree(cache); |
| 8400 | goto error; |
| 8401 | } |
Josef Bacik | 3c14874 | 2011-02-02 15:53:47 +0000 | [diff] [blame] | 8402 | |
| 8403 | /* |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8404 | * check for two cases, either we are full, and therefore |
| 8405 | * don't need to bother with the caching work since we won't |
| 8406 | * find any space, or we are empty, and we can just add all |
| 8407 | * the space in and be done with it. This saves us _alot_ of |
| 8408 | * time, particularly in the full case. |
| 8409 | */ |
| 8410 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8411 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8412 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8413 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8414 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8415 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8416 | cache->cached = BTRFS_CACHE_FINISHED; |
| 8417 | add_new_free_space(cache, root->fs_info, |
| 8418 | found_key.objectid, |
| 8419 | found_key.objectid + |
| 8420 | found_key.offset); |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8421 | free_excluded_extents(root, cache); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8422 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 8423 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8424 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 8425 | if (ret) { |
| 8426 | btrfs_remove_free_space_cache(cache); |
| 8427 | btrfs_put_block_group(cache); |
| 8428 | goto error; |
| 8429 | } |
| 8430 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8431 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 8432 | btrfs_block_group_used(&cache->item), |
| 8433 | &space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8434 | if (ret) { |
| 8435 | btrfs_remove_free_space_cache(cache); |
| 8436 | spin_lock(&info->block_group_cache_lock); |
| 8437 | rb_erase(&cache->cache_node, |
| 8438 | &info->block_group_cache_tree); |
| 8439 | spin_unlock(&info->block_group_cache_lock); |
| 8440 | btrfs_put_block_group(cache); |
| 8441 | goto error; |
| 8442 | } |
| 8443 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8444 | cache->space_info = space_info; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8445 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8446 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8447 | spin_unlock(&cache->space_info->lock); |
| 8448 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8449 | __link_block_group(space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8450 | |
Chris Mason | 75ccf47 | 2008-09-30 19:24:06 -0400 | [diff] [blame] | 8451 | set_avail_alloc_bits(root->fs_info, cache->flags); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 8452 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8453 | set_block_group_ro(cache, 1); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8454 | } |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8455 | |
| 8456 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { |
| 8457 | if (!(get_alloc_profile(root, space_info->flags) & |
| 8458 | (BTRFS_BLOCK_GROUP_RAID10 | |
| 8459 | BTRFS_BLOCK_GROUP_RAID1 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8460 | BTRFS_BLOCK_GROUP_RAID5 | |
| 8461 | BTRFS_BLOCK_GROUP_RAID6 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8462 | BTRFS_BLOCK_GROUP_DUP))) |
| 8463 | continue; |
| 8464 | /* |
| 8465 | * avoid allocating from un-mirrored block group if there are |
| 8466 | * mirrored block groups. |
| 8467 | */ |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 8468 | list_for_each_entry(cache, |
| 8469 | &space_info->block_groups[BTRFS_RAID_RAID0], |
| 8470 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8471 | set_block_group_ro(cache, 1); |
chandan | 1095cc0 | 2013-07-16 12:28:56 +0530 | [diff] [blame] | 8472 | list_for_each_entry(cache, |
| 8473 | &space_info->block_groups[BTRFS_RAID_SINGLE], |
| 8474 | list) |
Miao Xie | 199c36e | 2011-07-15 10:34:36 +0000 | [diff] [blame] | 8475 | set_block_group_ro(cache, 1); |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8476 | } |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8477 | |
| 8478 | init_global_block_rsv(info); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8479 | ret = 0; |
| 8480 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8481 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 8482 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 8483 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8484 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8485 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
| 8486 | struct btrfs_root *root) |
| 8487 | { |
| 8488 | struct btrfs_block_group_cache *block_group, *tmp; |
| 8489 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 8490 | struct btrfs_block_group_item item; |
| 8491 | struct btrfs_key key; |
| 8492 | int ret = 0; |
| 8493 | |
| 8494 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, |
| 8495 | new_bg_list) { |
| 8496 | list_del_init(&block_group->new_bg_list); |
| 8497 | |
| 8498 | if (ret) |
| 8499 | continue; |
| 8500 | |
| 8501 | spin_lock(&block_group->lock); |
| 8502 | memcpy(&item, &block_group->item, sizeof(item)); |
| 8503 | memcpy(&key, &block_group->key, sizeof(key)); |
| 8504 | spin_unlock(&block_group->lock); |
| 8505 | |
| 8506 | ret = btrfs_insert_item(trans, extent_root, &key, &item, |
| 8507 | sizeof(item)); |
| 8508 | if (ret) |
| 8509 | btrfs_abort_transaction(trans, extent_root, ret); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 8510 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
| 8511 | key.objectid, key.offset); |
| 8512 | if (ret) |
| 8513 | btrfs_abort_transaction(trans, extent_root, ret); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8514 | } |
| 8515 | } |
| 8516 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8517 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 8518 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 8519 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8520 | u64 size) |
| 8521 | { |
| 8522 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8523 | struct btrfs_root *extent_root; |
| 8524 | struct btrfs_block_group_cache *cache; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8525 | |
| 8526 | extent_root = root->fs_info->extent_root; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8527 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 8528 | root->fs_info->last_trans_log_full_commit = trans->transid; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 8529 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 8530 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 8531 | if (!cache) |
| 8532 | return -ENOMEM; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8533 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
| 8534 | GFP_NOFS); |
| 8535 | if (!cache->free_space_ctl) { |
| 8536 | kfree(cache); |
| 8537 | return -ENOMEM; |
| 8538 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 8539 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 8540 | cache->key.objectid = chunk_offset; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8541 | cache->key.offset = size; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 8542 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8543 | cache->sectorsize = root->sectorsize; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8544 | cache->fs_info = root->fs_info; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 8545 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
| 8546 | &root->fs_info->mapping_tree, |
| 8547 | chunk_offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8548 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 8549 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 8550 | spin_lock_init(&cache->lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 8551 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 8552 | INIT_LIST_HEAD(&cache->cluster_list); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8553 | INIT_LIST_HEAD(&cache->new_bg_list); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 8554 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 8555 | btrfs_init_free_space_ctl(cache); |
| 8556 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8557 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8558 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
| 8559 | cache->flags = type; |
| 8560 | btrfs_set_block_group_flags(&cache->item, type); |
| 8561 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8562 | cache->last_byte_to_unpin = (u64)-1; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8563 | cache->cached = BTRFS_CACHE_FINISHED; |
Josef Bacik | 835d974 | 2013-03-19 12:13:25 -0400 | [diff] [blame] | 8564 | ret = exclude_super_stripes(root, cache); |
| 8565 | if (ret) { |
| 8566 | /* |
| 8567 | * We may have excluded something, so call this just in |
| 8568 | * case. |
| 8569 | */ |
| 8570 | free_excluded_extents(root, cache); |
| 8571 | kfree(cache->free_space_ctl); |
| 8572 | kfree(cache); |
| 8573 | return ret; |
| 8574 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8575 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8576 | add_new_free_space(cache, root->fs_info, chunk_offset, |
| 8577 | chunk_offset + size); |
| 8578 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8579 | free_excluded_extents(root, cache); |
| 8580 | |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8581 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 8582 | if (ret) { |
| 8583 | btrfs_remove_free_space_cache(cache); |
| 8584 | btrfs_put_block_group(cache); |
| 8585 | return ret; |
| 8586 | } |
| 8587 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8588 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 8589 | &cache->space_info); |
Josef Bacik | 8c579fe | 2013-04-02 12:40:42 -0400 | [diff] [blame] | 8590 | if (ret) { |
| 8591 | btrfs_remove_free_space_cache(cache); |
| 8592 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 8593 | rb_erase(&cache->cache_node, |
| 8594 | &root->fs_info->block_group_cache_tree); |
| 8595 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 8596 | btrfs_put_block_group(cache); |
| 8597 | return ret; |
| 8598 | } |
Li Zefan | c7c144d | 2011-12-07 10:39:22 +0800 | [diff] [blame] | 8599 | update_global_block_rsv(root->fs_info); |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8600 | |
| 8601 | spin_lock(&cache->space_info->lock); |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 8602 | cache->space_info->bytes_readonly += cache->bytes_super; |
Josef Bacik | 1b2da37 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 8603 | spin_unlock(&cache->space_info->lock); |
| 8604 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 8605 | __link_block_group(cache->space_info, cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8606 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 8607 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8608 | |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 8609 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 8610 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 8611 | return 0; |
| 8612 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8613 | |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8614 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 8615 | { |
Ilya Dryomov | 899c81e | 2012-03-27 17:09:16 +0300 | [diff] [blame] | 8616 | u64 extra_flags = chunk_to_extended(flags) & |
| 8617 | BTRFS_EXTENDED_PROFILE_MASK; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8618 | |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 8619 | write_seqlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8620 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 8621 | fs_info->avail_data_alloc_bits &= ~extra_flags; |
| 8622 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 8623 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; |
| 8624 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 8625 | fs_info->avail_system_alloc_bits &= ~extra_flags; |
Miao Xie | de98ced | 2013-01-29 10:13:12 +0000 | [diff] [blame] | 8626 | write_sequnlock(&fs_info->profiles_lock); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8627 | } |
| 8628 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8629 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
| 8630 | struct btrfs_root *root, u64 group_start) |
| 8631 | { |
| 8632 | struct btrfs_path *path; |
| 8633 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 8634 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8635 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8636 | struct btrfs_key key; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8637 | struct inode *inode; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8638 | int ret; |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8639 | int index; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 8640 | int factor; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8641 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8642 | root = root->fs_info->extent_root; |
| 8643 | |
| 8644 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); |
| 8645 | BUG_ON(!block_group); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 8646 | BUG_ON(!block_group->ro); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8647 | |
liubo | 9f7c43c | 2011-03-07 02:13:33 +0000 | [diff] [blame] | 8648 | /* |
| 8649 | * Free the reserved super bytes from this block group before |
| 8650 | * remove it. |
| 8651 | */ |
| 8652 | free_excluded_extents(root, block_group); |
| 8653 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8654 | memcpy(&key, &block_group->key, sizeof(key)); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8655 | index = get_block_group_index(block_group); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 8656 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
| 8657 | BTRFS_BLOCK_GROUP_RAID1 | |
| 8658 | BTRFS_BLOCK_GROUP_RAID10)) |
| 8659 | factor = 2; |
| 8660 | else |
| 8661 | factor = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8662 | |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 8663 | /* make sure this block group isn't part of an allocation cluster */ |
| 8664 | cluster = &root->fs_info->data_alloc_cluster; |
| 8665 | spin_lock(&cluster->refill_lock); |
| 8666 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 8667 | spin_unlock(&cluster->refill_lock); |
| 8668 | |
| 8669 | /* |
| 8670 | * make sure this block group isn't part of a metadata |
| 8671 | * allocation cluster |
| 8672 | */ |
| 8673 | cluster = &root->fs_info->meta_alloc_cluster; |
| 8674 | spin_lock(&cluster->refill_lock); |
| 8675 | btrfs_return_cluster_to_free_space(block_group, cluster); |
| 8676 | spin_unlock(&cluster->refill_lock); |
| 8677 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8678 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 8679 | if (!path) { |
| 8680 | ret = -ENOMEM; |
| 8681 | goto out; |
| 8682 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8683 | |
Ilya Dryomov | 10b2f34 | 2011-10-02 13:56:53 +0300 | [diff] [blame] | 8684 | inode = lookup_free_space_inode(tree_root, block_group, path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8685 | if (!IS_ERR(inode)) { |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 8686 | ret = btrfs_orphan_add(trans, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 8687 | if (ret) { |
| 8688 | btrfs_add_delayed_iput(inode); |
| 8689 | goto out; |
| 8690 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8691 | clear_nlink(inode); |
| 8692 | /* One for the block groups ref */ |
| 8693 | spin_lock(&block_group->lock); |
| 8694 | if (block_group->iref) { |
| 8695 | block_group->iref = 0; |
| 8696 | block_group->inode = NULL; |
| 8697 | spin_unlock(&block_group->lock); |
| 8698 | iput(inode); |
| 8699 | } else { |
| 8700 | spin_unlock(&block_group->lock); |
| 8701 | } |
| 8702 | /* One for our lookup ref */ |
Josef Bacik | 455757c | 2011-09-19 12:26:24 -0400 | [diff] [blame] | 8703 | btrfs_add_delayed_iput(inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8704 | } |
| 8705 | |
| 8706 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 8707 | key.offset = block_group->key.objectid; |
| 8708 | key.type = 0; |
| 8709 | |
| 8710 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); |
| 8711 | if (ret < 0) |
| 8712 | goto out; |
| 8713 | if (ret > 0) |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8714 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8715 | if (ret == 0) { |
| 8716 | ret = btrfs_del_item(trans, tree_root, path); |
| 8717 | if (ret) |
| 8718 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 8719 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8720 | } |
| 8721 | |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 8722 | spin_lock(&root->fs_info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8723 | rb_erase(&block_group->cache_node, |
| 8724 | &root->fs_info->block_group_cache_tree); |
Liu Bo | a1897fd | 2012-12-27 09:01:23 +0000 | [diff] [blame] | 8725 | |
| 8726 | if (root->fs_info->first_logical_byte == block_group->key.objectid) |
| 8727 | root->fs_info->first_logical_byte = (u64)-1; |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 8728 | spin_unlock(&root->fs_info->block_group_cache_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8729 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8730 | down_write(&block_group->space_info->groups_sem); |
Chris Mason | 44fb551 | 2009-06-04 15:34:51 -0400 | [diff] [blame] | 8731 | /* |
| 8732 | * we must use list_del_init so people can check to see if they |
| 8733 | * are still on the list after taking the semaphore |
| 8734 | */ |
| 8735 | list_del_init(&block_group->list); |
Ilya Dryomov | 10ea00f | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 8736 | if (list_empty(&block_group->space_info->block_groups[index])) |
| 8737 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 8738 | up_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8739 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8740 | if (block_group->cached == BTRFS_CACHE_STARTED) |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 8741 | wait_block_group_cache_done(block_group); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 8742 | |
| 8743 | btrfs_remove_free_space_cache(block_group); |
| 8744 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 8745 | spin_lock(&block_group->space_info->lock); |
| 8746 | block_group->space_info->total_bytes -= block_group->key.offset; |
| 8747 | block_group->space_info->bytes_readonly -= block_group->key.offset; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 8748 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 8749 | spin_unlock(&block_group->space_info->lock); |
Chris Mason | 283bb19 | 2009-07-24 16:30:55 -0400 | [diff] [blame] | 8750 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 8751 | memcpy(&key, &block_group->key, sizeof(key)); |
| 8752 | |
Chris Mason | 283bb19 | 2009-07-24 16:30:55 -0400 | [diff] [blame] | 8753 | btrfs_clear_space_info_full(root->fs_info); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 8754 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 8755 | btrfs_put_block_group(block_group); |
| 8756 | btrfs_put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 8757 | |
| 8758 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 8759 | if (ret > 0) |
| 8760 | ret = -EIO; |
| 8761 | if (ret < 0) |
| 8762 | goto out; |
| 8763 | |
| 8764 | ret = btrfs_del_item(trans, root, path); |
| 8765 | out: |
| 8766 | btrfs_free_path(path); |
| 8767 | return ret; |
| 8768 | } |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 8769 | |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8770 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
| 8771 | { |
| 8772 | struct btrfs_space_info *space_info; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8773 | struct btrfs_super_block *disk_super; |
| 8774 | u64 features; |
| 8775 | u64 flags; |
| 8776 | int mixed = 0; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8777 | int ret; |
| 8778 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 8779 | disk_super = fs_info->super_copy; |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8780 | if (!btrfs_super_root(disk_super)) |
| 8781 | return 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8782 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8783 | features = btrfs_super_incompat_flags(disk_super); |
| 8784 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) |
| 8785 | mixed = 1; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8786 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8787 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
| 8788 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8789 | if (ret) |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8790 | goto out; |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8791 | |
liubo | 1aba86d | 2011-04-08 08:44:37 +0000 | [diff] [blame] | 8792 | if (mixed) { |
| 8793 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; |
| 8794 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 8795 | } else { |
| 8796 | flags = BTRFS_BLOCK_GROUP_METADATA; |
| 8797 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 8798 | if (ret) |
| 8799 | goto out; |
| 8800 | |
| 8801 | flags = BTRFS_BLOCK_GROUP_DATA; |
| 8802 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); |
| 8803 | } |
| 8804 | out: |
liubo | c59021f | 2011-03-07 02:13:14 +0000 | [diff] [blame] | 8805 | return ret; |
| 8806 | } |
| 8807 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 8808 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
| 8809 | { |
| 8810 | return unpin_extent_range(root, start, end); |
| 8811 | } |
| 8812 | |
| 8813 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 8814 | u64 num_bytes, u64 *actual_bytes) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 8815 | { |
Li Dongyang | 5378e60 | 2011-03-24 10:24:27 +0000 | [diff] [blame] | 8816 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 8817 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 8818 | |
| 8819 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) |
| 8820 | { |
| 8821 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 8822 | struct btrfs_block_group_cache *cache = NULL; |
| 8823 | u64 group_trimmed; |
| 8824 | u64 start; |
| 8825 | u64 end; |
| 8826 | u64 trimmed = 0; |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 8827 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 8828 | int ret = 0; |
| 8829 | |
Liu Bo | 2cac13e | 2012-02-09 18:17:41 +0800 | [diff] [blame] | 8830 | /* |
| 8831 | * try to trim all FS space, our block group may start from non-zero. |
| 8832 | */ |
| 8833 | if (range->len == total_bytes) |
| 8834 | cache = btrfs_lookup_first_block_group(fs_info, range->start); |
| 8835 | else |
| 8836 | cache = btrfs_lookup_block_group(fs_info, range->start); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 8837 | |
| 8838 | while (cache) { |
| 8839 | if (cache->key.objectid >= (range->start + range->len)) { |
| 8840 | btrfs_put_block_group(cache); |
| 8841 | break; |
| 8842 | } |
| 8843 | |
| 8844 | start = max(range->start, cache->key.objectid); |
| 8845 | end = min(range->start + range->len, |
| 8846 | cache->key.objectid + cache->key.offset); |
| 8847 | |
| 8848 | if (end - start >= range->minlen) { |
| 8849 | if (!block_group_cache_done(cache)) { |
Liu Bo | f6373bf | 2012-12-27 09:01:18 +0000 | [diff] [blame] | 8850 | ret = cache_block_group(cache, 0); |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 8851 | if (ret) { |
| 8852 | btrfs_put_block_group(cache); |
| 8853 | break; |
| 8854 | } |
| 8855 | ret = wait_block_group_cache_done(cache); |
| 8856 | if (ret) { |
| 8857 | btrfs_put_block_group(cache); |
| 8858 | break; |
| 8859 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 8860 | } |
| 8861 | ret = btrfs_trim_block_group(cache, |
| 8862 | &group_trimmed, |
| 8863 | start, |
| 8864 | end, |
| 8865 | range->minlen); |
| 8866 | |
| 8867 | trimmed += group_trimmed; |
| 8868 | if (ret) { |
| 8869 | btrfs_put_block_group(cache); |
| 8870 | break; |
| 8871 | } |
| 8872 | } |
| 8873 | |
| 8874 | cache = next_block_group(fs_info->tree_root, cache); |
| 8875 | } |
| 8876 | |
| 8877 | range->len = trimmed; |
| 8878 | return ret; |
| 8879 | } |