Commit | Line | Data |
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6cbd5570 CM |
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 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
4b4e25f2 | 26 | #include "compat.h" |
74493f7a | 27 | #include "hash.h" |
fec577fb CM |
28 | #include "ctree.h" |
29 | #include "disk-io.h" | |
30 | #include "print-tree.h" | |
e089f05c | 31 | #include "transaction.h" |
0b86a832 | 32 | #include "volumes.h" |
925baedd | 33 | #include "locking.h" |
fa9c0d79 | 34 | #include "free-space-cache.h" |
fec577fb | 35 | |
0e4f8f88 CM |
36 | /* control flags for do_chunk_alloc's force field |
37 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk | |
38 | * if we really need one. | |
39 | * | |
40 | * CHUNK_ALLOC_FORCE means it must try to allocate one | |
41 | * | |
42 | * CHUNK_ALLOC_LIMITED means to only try and allocate one | |
43 | * if we have very few chunks already allocated. This is | |
44 | * used as part of the clustering code to help make sure | |
45 | * we have a good pool of storage to cluster in, without | |
46 | * filling the FS with empty chunks | |
47 | * | |
48 | */ | |
49 | enum { | |
50 | CHUNK_ALLOC_NO_FORCE = 0, | |
51 | CHUNK_ALLOC_FORCE = 1, | |
52 | CHUNK_ALLOC_LIMITED = 2, | |
53 | }; | |
54 | ||
f3465ca4 JB |
55 | static int update_block_group(struct btrfs_trans_handle *trans, |
56 | struct btrfs_root *root, | |
f0486c68 | 57 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
58 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
59 | struct btrfs_root *root, | |
60 | u64 bytenr, u64 num_bytes, u64 parent, | |
61 | u64 root_objectid, u64 owner_objectid, | |
62 | u64 owner_offset, int refs_to_drop, | |
63 | struct btrfs_delayed_extent_op *extra_op); | |
64 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
65 | struct extent_buffer *leaf, | |
66 | struct btrfs_extent_item *ei); | |
67 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
68 | struct btrfs_root *root, | |
69 | u64 parent, u64 root_objectid, | |
70 | u64 flags, u64 owner, u64 offset, | |
71 | struct btrfs_key *ins, int ref_mod); | |
72 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
73 | struct btrfs_root *root, | |
74 | u64 parent, u64 root_objectid, | |
75 | u64 flags, struct btrfs_disk_key *key, | |
76 | int level, struct btrfs_key *ins); | |
6a63209f JB |
77 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
78 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
79 | u64 flags, int force); | |
11833d66 YZ |
80 | static int find_next_key(struct btrfs_path *path, int level, |
81 | struct btrfs_key *key); | |
9ed74f2d JB |
82 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
83 | int dump_block_groups); | |
6a63209f | 84 | |
817d52f8 JB |
85 | static noinline int |
86 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
87 | { | |
88 | smp_mb(); | |
89 | return cache->cached == BTRFS_CACHE_FINISHED; | |
90 | } | |
91 | ||
0f9dd46c JB |
92 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
93 | { | |
94 | return (cache->flags & bits) == bits; | |
95 | } | |
96 | ||
62a45b60 | 97 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
98 | { |
99 | atomic_inc(&cache->count); | |
100 | } | |
101 | ||
102 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
103 | { | |
f0486c68 YZ |
104 | if (atomic_dec_and_test(&cache->count)) { |
105 | WARN_ON(cache->pinned > 0); | |
106 | WARN_ON(cache->reserved > 0); | |
107 | WARN_ON(cache->reserved_pinned > 0); | |
34d52cb6 | 108 | kfree(cache->free_space_ctl); |
11dfe35a | 109 | kfree(cache); |
f0486c68 | 110 | } |
11dfe35a JB |
111 | } |
112 | ||
0f9dd46c JB |
113 | /* |
114 | * this adds the block group to the fs_info rb tree for the block group | |
115 | * cache | |
116 | */ | |
b2950863 | 117 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
118 | struct btrfs_block_group_cache *block_group) |
119 | { | |
120 | struct rb_node **p; | |
121 | struct rb_node *parent = NULL; | |
122 | struct btrfs_block_group_cache *cache; | |
123 | ||
124 | spin_lock(&info->block_group_cache_lock); | |
125 | p = &info->block_group_cache_tree.rb_node; | |
126 | ||
127 | while (*p) { | |
128 | parent = *p; | |
129 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
130 | cache_node); | |
131 | if (block_group->key.objectid < cache->key.objectid) { | |
132 | p = &(*p)->rb_left; | |
133 | } else if (block_group->key.objectid > cache->key.objectid) { | |
134 | p = &(*p)->rb_right; | |
135 | } else { | |
136 | spin_unlock(&info->block_group_cache_lock); | |
137 | return -EEXIST; | |
138 | } | |
139 | } | |
140 | ||
141 | rb_link_node(&block_group->cache_node, parent, p); | |
142 | rb_insert_color(&block_group->cache_node, | |
143 | &info->block_group_cache_tree); | |
144 | spin_unlock(&info->block_group_cache_lock); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | /* | |
150 | * This will return the block group at or after bytenr if contains is 0, else | |
151 | * it will return the block group that contains the bytenr | |
152 | */ | |
153 | static struct btrfs_block_group_cache * | |
154 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
155 | int contains) | |
156 | { | |
157 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
158 | struct rb_node *n; | |
159 | u64 end, start; | |
160 | ||
161 | spin_lock(&info->block_group_cache_lock); | |
162 | n = info->block_group_cache_tree.rb_node; | |
163 | ||
164 | while (n) { | |
165 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
166 | cache_node); | |
167 | end = cache->key.objectid + cache->key.offset - 1; | |
168 | start = cache->key.objectid; | |
169 | ||
170 | if (bytenr < start) { | |
171 | if (!contains && (!ret || start < ret->key.objectid)) | |
172 | ret = cache; | |
173 | n = n->rb_left; | |
174 | } else if (bytenr > start) { | |
175 | if (contains && bytenr <= end) { | |
176 | ret = cache; | |
177 | break; | |
178 | } | |
179 | n = n->rb_right; | |
180 | } else { | |
181 | ret = cache; | |
182 | break; | |
183 | } | |
184 | } | |
d2fb3437 | 185 | if (ret) |
11dfe35a | 186 | btrfs_get_block_group(ret); |
0f9dd46c JB |
187 | spin_unlock(&info->block_group_cache_lock); |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
11833d66 YZ |
192 | static int add_excluded_extent(struct btrfs_root *root, |
193 | u64 start, u64 num_bytes) | |
817d52f8 | 194 | { |
11833d66 YZ |
195 | u64 end = start + num_bytes - 1; |
196 | set_extent_bits(&root->fs_info->freed_extents[0], | |
197 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
198 | set_extent_bits(&root->fs_info->freed_extents[1], | |
199 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
200 | return 0; | |
201 | } | |
817d52f8 | 202 | |
11833d66 YZ |
203 | static void free_excluded_extents(struct btrfs_root *root, |
204 | struct btrfs_block_group_cache *cache) | |
205 | { | |
206 | u64 start, end; | |
817d52f8 | 207 | |
11833d66 YZ |
208 | start = cache->key.objectid; |
209 | end = start + cache->key.offset - 1; | |
210 | ||
211 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
212 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
213 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
214 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
215 | } |
216 | ||
11833d66 YZ |
217 | static int exclude_super_stripes(struct btrfs_root *root, |
218 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 219 | { |
817d52f8 JB |
220 | u64 bytenr; |
221 | u64 *logical; | |
222 | int stripe_len; | |
223 | int i, nr, ret; | |
224 | ||
06b2331f YZ |
225 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
226 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
227 | cache->bytes_super += stripe_len; | |
228 | ret = add_excluded_extent(root, cache->key.objectid, | |
229 | stripe_len); | |
230 | BUG_ON(ret); | |
231 | } | |
232 | ||
817d52f8 JB |
233 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
234 | bytenr = btrfs_sb_offset(i); | |
235 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
236 | cache->key.objectid, bytenr, | |
237 | 0, &logical, &nr, &stripe_len); | |
238 | BUG_ON(ret); | |
11833d66 | 239 | |
817d52f8 | 240 | while (nr--) { |
1b2da372 | 241 | cache->bytes_super += stripe_len; |
11833d66 YZ |
242 | ret = add_excluded_extent(root, logical[nr], |
243 | stripe_len); | |
244 | BUG_ON(ret); | |
817d52f8 | 245 | } |
11833d66 | 246 | |
817d52f8 JB |
247 | kfree(logical); |
248 | } | |
817d52f8 JB |
249 | return 0; |
250 | } | |
251 | ||
11833d66 YZ |
252 | static struct btrfs_caching_control * |
253 | get_caching_control(struct btrfs_block_group_cache *cache) | |
254 | { | |
255 | struct btrfs_caching_control *ctl; | |
256 | ||
257 | spin_lock(&cache->lock); | |
258 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
259 | spin_unlock(&cache->lock); | |
260 | return NULL; | |
261 | } | |
262 | ||
dde5abee JB |
263 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
264 | if (!cache->caching_ctl) { | |
265 | spin_unlock(&cache->lock); | |
11833d66 YZ |
266 | return NULL; |
267 | } | |
268 | ||
269 | ctl = cache->caching_ctl; | |
270 | atomic_inc(&ctl->count); | |
271 | spin_unlock(&cache->lock); | |
272 | return ctl; | |
273 | } | |
274 | ||
275 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
276 | { | |
277 | if (atomic_dec_and_test(&ctl->count)) | |
278 | kfree(ctl); | |
279 | } | |
280 | ||
0f9dd46c JB |
281 | /* |
282 | * this is only called by cache_block_group, since we could have freed extents | |
283 | * we need to check the pinned_extents for any extents that can't be used yet | |
284 | * since their free space will be released as soon as the transaction commits. | |
285 | */ | |
817d52f8 | 286 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
287 | struct btrfs_fs_info *info, u64 start, u64 end) |
288 | { | |
817d52f8 | 289 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
290 | int ret; |
291 | ||
292 | while (start < end) { | |
11833d66 | 293 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 294 | &extent_start, &extent_end, |
11833d66 | 295 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
296 | if (ret) |
297 | break; | |
298 | ||
06b2331f | 299 | if (extent_start <= start) { |
0f9dd46c JB |
300 | start = extent_end + 1; |
301 | } else if (extent_start > start && extent_start < end) { | |
302 | size = extent_start - start; | |
817d52f8 | 303 | total_added += size; |
ea6a478e JB |
304 | ret = btrfs_add_free_space(block_group, start, |
305 | size); | |
0f9dd46c JB |
306 | BUG_ON(ret); |
307 | start = extent_end + 1; | |
308 | } else { | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | if (start < end) { | |
314 | size = end - start; | |
817d52f8 | 315 | total_added += size; |
ea6a478e | 316 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
317 | BUG_ON(ret); |
318 | } | |
319 | ||
817d52f8 | 320 | return total_added; |
0f9dd46c JB |
321 | } |
322 | ||
817d52f8 | 323 | static int caching_kthread(void *data) |
e37c9e69 | 324 | { |
817d52f8 JB |
325 | struct btrfs_block_group_cache *block_group = data; |
326 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
11833d66 YZ |
327 | struct btrfs_caching_control *caching_ctl = block_group->caching_ctl; |
328 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 329 | struct btrfs_path *path; |
5f39d397 | 330 | struct extent_buffer *leaf; |
11833d66 | 331 | struct btrfs_key key; |
817d52f8 | 332 | u64 total_found = 0; |
11833d66 YZ |
333 | u64 last = 0; |
334 | u32 nritems; | |
335 | int ret = 0; | |
f510cfec | 336 | |
e37c9e69 CM |
337 | path = btrfs_alloc_path(); |
338 | if (!path) | |
339 | return -ENOMEM; | |
7d7d6068 | 340 | |
817d52f8 | 341 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 342 | |
5cd57b2c | 343 | /* |
817d52f8 JB |
344 | * We don't want to deadlock with somebody trying to allocate a new |
345 | * extent for the extent root while also trying to search the extent | |
346 | * root to add free space. So we skip locking and search the commit | |
347 | * root, since its read-only | |
5cd57b2c CM |
348 | */ |
349 | path->skip_locking = 1; | |
817d52f8 | 350 | path->search_commit_root = 1; |
026fd317 | 351 | path->reada = 1; |
817d52f8 | 352 | |
e4404d6e | 353 | key.objectid = last; |
e37c9e69 | 354 | key.offset = 0; |
11833d66 | 355 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 356 | again: |
11833d66 | 357 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
358 | /* need to make sure the commit_root doesn't disappear */ |
359 | down_read(&fs_info->extent_commit_sem); | |
360 | ||
11833d66 | 361 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 362 | if (ret < 0) |
ef8bbdfe | 363 | goto err; |
a512bbf8 | 364 | |
11833d66 YZ |
365 | leaf = path->nodes[0]; |
366 | nritems = btrfs_header_nritems(leaf); | |
367 | ||
d397712b | 368 | while (1) { |
817d52f8 | 369 | smp_mb(); |
11833d66 | 370 | if (fs_info->closing > 1) { |
f25784b3 | 371 | last = (u64)-1; |
817d52f8 | 372 | break; |
f25784b3 | 373 | } |
817d52f8 | 374 | |
11833d66 YZ |
375 | if (path->slots[0] < nritems) { |
376 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
377 | } else { | |
378 | ret = find_next_key(path, 0, &key); | |
379 | if (ret) | |
e37c9e69 | 380 | break; |
817d52f8 | 381 | |
589d8ade JB |
382 | if (need_resched() || |
383 | btrfs_next_leaf(extent_root, path)) { | |
384 | caching_ctl->progress = last; | |
ff5714cc | 385 | btrfs_release_path(path); |
589d8ade JB |
386 | up_read(&fs_info->extent_commit_sem); |
387 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 388 | cond_resched(); |
589d8ade JB |
389 | goto again; |
390 | } | |
391 | leaf = path->nodes[0]; | |
392 | nritems = btrfs_header_nritems(leaf); | |
393 | continue; | |
11833d66 | 394 | } |
817d52f8 | 395 | |
11833d66 YZ |
396 | if (key.objectid < block_group->key.objectid) { |
397 | path->slots[0]++; | |
817d52f8 | 398 | continue; |
e37c9e69 | 399 | } |
0f9dd46c | 400 | |
e37c9e69 | 401 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 402 | block_group->key.offset) |
e37c9e69 | 403 | break; |
7d7d6068 | 404 | |
11833d66 | 405 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
406 | total_found += add_new_free_space(block_group, |
407 | fs_info, last, | |
408 | key.objectid); | |
7d7d6068 | 409 | last = key.objectid + key.offset; |
817d52f8 | 410 | |
11833d66 YZ |
411 | if (total_found > (1024 * 1024 * 2)) { |
412 | total_found = 0; | |
413 | wake_up(&caching_ctl->wait); | |
414 | } | |
817d52f8 | 415 | } |
e37c9e69 CM |
416 | path->slots[0]++; |
417 | } | |
817d52f8 | 418 | ret = 0; |
e37c9e69 | 419 | |
817d52f8 JB |
420 | total_found += add_new_free_space(block_group, fs_info, last, |
421 | block_group->key.objectid + | |
422 | block_group->key.offset); | |
11833d66 | 423 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
424 | |
425 | spin_lock(&block_group->lock); | |
11833d66 | 426 | block_group->caching_ctl = NULL; |
817d52f8 JB |
427 | block_group->cached = BTRFS_CACHE_FINISHED; |
428 | spin_unlock(&block_group->lock); | |
0f9dd46c | 429 | |
54aa1f4d | 430 | err: |
e37c9e69 | 431 | btrfs_free_path(path); |
276e680d | 432 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 433 | |
11833d66 YZ |
434 | free_excluded_extents(extent_root, block_group); |
435 | ||
436 | mutex_unlock(&caching_ctl->mutex); | |
437 | wake_up(&caching_ctl->wait); | |
438 | ||
439 | put_caching_control(caching_ctl); | |
440 | atomic_dec(&block_group->space_info->caching_threads); | |
11dfe35a JB |
441 | btrfs_put_block_group(block_group); |
442 | ||
817d52f8 JB |
443 | return 0; |
444 | } | |
445 | ||
9d66e233 JB |
446 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
447 | struct btrfs_trans_handle *trans, | |
b8399dee | 448 | struct btrfs_root *root, |
9d66e233 | 449 | int load_cache_only) |
817d52f8 | 450 | { |
11833d66 YZ |
451 | struct btrfs_fs_info *fs_info = cache->fs_info; |
452 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
453 | struct task_struct *tsk; |
454 | int ret = 0; | |
455 | ||
11833d66 YZ |
456 | smp_mb(); |
457 | if (cache->cached != BTRFS_CACHE_NO) | |
458 | return 0; | |
459 | ||
9d66e233 JB |
460 | /* |
461 | * We can't do the read from on-disk cache during a commit since we need | |
b8399dee JB |
462 | * to have the normal tree locking. Also if we are currently trying to |
463 | * allocate blocks for the tree root we can't do the fast caching since | |
464 | * we likely hold important locks. | |
9d66e233 | 465 | */ |
f7039b1d | 466 | if (trans && (!trans->transaction->in_commit) && |
b8399dee | 467 | (root && root != root->fs_info->tree_root)) { |
9d66e233 JB |
468 | spin_lock(&cache->lock); |
469 | if (cache->cached != BTRFS_CACHE_NO) { | |
470 | spin_unlock(&cache->lock); | |
471 | return 0; | |
472 | } | |
473 | cache->cached = BTRFS_CACHE_STARTED; | |
474 | spin_unlock(&cache->lock); | |
475 | ||
476 | ret = load_free_space_cache(fs_info, cache); | |
477 | ||
478 | spin_lock(&cache->lock); | |
479 | if (ret == 1) { | |
480 | cache->cached = BTRFS_CACHE_FINISHED; | |
481 | cache->last_byte_to_unpin = (u64)-1; | |
482 | } else { | |
483 | cache->cached = BTRFS_CACHE_NO; | |
484 | } | |
485 | spin_unlock(&cache->lock); | |
3c14874a JB |
486 | if (ret == 1) { |
487 | free_excluded_extents(fs_info->extent_root, cache); | |
9d66e233 | 488 | return 0; |
3c14874a | 489 | } |
9d66e233 JB |
490 | } |
491 | ||
492 | if (load_cache_only) | |
493 | return 0; | |
494 | ||
fc0e4a31 | 495 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
11833d66 YZ |
496 | BUG_ON(!caching_ctl); |
497 | ||
498 | INIT_LIST_HEAD(&caching_ctl->list); | |
499 | mutex_init(&caching_ctl->mutex); | |
500 | init_waitqueue_head(&caching_ctl->wait); | |
501 | caching_ctl->block_group = cache; | |
502 | caching_ctl->progress = cache->key.objectid; | |
503 | /* one for caching kthread, one for caching block group list */ | |
504 | atomic_set(&caching_ctl->count, 2); | |
505 | ||
817d52f8 JB |
506 | spin_lock(&cache->lock); |
507 | if (cache->cached != BTRFS_CACHE_NO) { | |
508 | spin_unlock(&cache->lock); | |
11833d66 YZ |
509 | kfree(caching_ctl); |
510 | return 0; | |
817d52f8 | 511 | } |
11833d66 | 512 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
513 | cache->cached = BTRFS_CACHE_STARTED; |
514 | spin_unlock(&cache->lock); | |
515 | ||
11833d66 YZ |
516 | down_write(&fs_info->extent_commit_sem); |
517 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
518 | up_write(&fs_info->extent_commit_sem); | |
519 | ||
520 | atomic_inc(&cache->space_info->caching_threads); | |
11dfe35a | 521 | btrfs_get_block_group(cache); |
11833d66 | 522 | |
817d52f8 JB |
523 | tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n", |
524 | cache->key.objectid); | |
525 | if (IS_ERR(tsk)) { | |
526 | ret = PTR_ERR(tsk); | |
527 | printk(KERN_ERR "error running thread %d\n", ret); | |
528 | BUG(); | |
529 | } | |
530 | ||
ef8bbdfe | 531 | return ret; |
e37c9e69 CM |
532 | } |
533 | ||
0f9dd46c JB |
534 | /* |
535 | * return the block group that starts at or after bytenr | |
536 | */ | |
d397712b CM |
537 | static struct btrfs_block_group_cache * |
538 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 539 | { |
0f9dd46c | 540 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 541 | |
0f9dd46c | 542 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 543 | |
0f9dd46c | 544 | return cache; |
0ef3e66b CM |
545 | } |
546 | ||
0f9dd46c | 547 | /* |
9f55684c | 548 | * return the block group that contains the given bytenr |
0f9dd46c | 549 | */ |
d397712b CM |
550 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
551 | struct btrfs_fs_info *info, | |
552 | u64 bytenr) | |
be744175 | 553 | { |
0f9dd46c | 554 | struct btrfs_block_group_cache *cache; |
be744175 | 555 | |
0f9dd46c | 556 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 557 | |
0f9dd46c | 558 | return cache; |
be744175 | 559 | } |
0b86a832 | 560 | |
0f9dd46c JB |
561 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
562 | u64 flags) | |
6324fbf3 | 563 | { |
0f9dd46c | 564 | struct list_head *head = &info->space_info; |
0f9dd46c | 565 | struct btrfs_space_info *found; |
4184ea7f | 566 | |
b742bb82 YZ |
567 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
568 | BTRFS_BLOCK_GROUP_METADATA; | |
569 | ||
4184ea7f CM |
570 | rcu_read_lock(); |
571 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 572 | if (found->flags & flags) { |
4184ea7f | 573 | rcu_read_unlock(); |
0f9dd46c | 574 | return found; |
4184ea7f | 575 | } |
0f9dd46c | 576 | } |
4184ea7f | 577 | rcu_read_unlock(); |
0f9dd46c | 578 | return NULL; |
6324fbf3 CM |
579 | } |
580 | ||
4184ea7f CM |
581 | /* |
582 | * after adding space to the filesystem, we need to clear the full flags | |
583 | * on all the space infos. | |
584 | */ | |
585 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
586 | { | |
587 | struct list_head *head = &info->space_info; | |
588 | struct btrfs_space_info *found; | |
589 | ||
590 | rcu_read_lock(); | |
591 | list_for_each_entry_rcu(found, head, list) | |
592 | found->full = 0; | |
593 | rcu_read_unlock(); | |
594 | } | |
595 | ||
80eb234a JB |
596 | static u64 div_factor(u64 num, int factor) |
597 | { | |
598 | if (factor == 10) | |
599 | return num; | |
600 | num *= factor; | |
601 | do_div(num, 10); | |
602 | return num; | |
603 | } | |
604 | ||
e5bc2458 CM |
605 | static u64 div_factor_fine(u64 num, int factor) |
606 | { | |
607 | if (factor == 100) | |
608 | return num; | |
609 | num *= factor; | |
610 | do_div(num, 100); | |
611 | return num; | |
612 | } | |
613 | ||
d2fb3437 YZ |
614 | u64 btrfs_find_block_group(struct btrfs_root *root, |
615 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 616 | { |
96b5179d | 617 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 618 | u64 used; |
d2fb3437 YZ |
619 | u64 last = max(search_hint, search_start); |
620 | u64 group_start = 0; | |
31f3c99b | 621 | int full_search = 0; |
d2fb3437 | 622 | int factor = 9; |
0ef3e66b | 623 | int wrapped = 0; |
31f3c99b | 624 | again: |
e8569813 ZY |
625 | while (1) { |
626 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
627 | if (!cache) |
628 | break; | |
96b5179d | 629 | |
c286ac48 | 630 | spin_lock(&cache->lock); |
96b5179d CM |
631 | last = cache->key.objectid + cache->key.offset; |
632 | used = btrfs_block_group_used(&cache->item); | |
633 | ||
d2fb3437 YZ |
634 | if ((full_search || !cache->ro) && |
635 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 636 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
637 | div_factor(cache->key.offset, factor)) { |
638 | group_start = cache->key.objectid; | |
c286ac48 | 639 | spin_unlock(&cache->lock); |
fa9c0d79 | 640 | btrfs_put_block_group(cache); |
8790d502 CM |
641 | goto found; |
642 | } | |
6324fbf3 | 643 | } |
c286ac48 | 644 | spin_unlock(&cache->lock); |
fa9c0d79 | 645 | btrfs_put_block_group(cache); |
de428b63 | 646 | cond_resched(); |
cd1bc465 | 647 | } |
0ef3e66b CM |
648 | if (!wrapped) { |
649 | last = search_start; | |
650 | wrapped = 1; | |
651 | goto again; | |
652 | } | |
653 | if (!full_search && factor < 10) { | |
be744175 | 654 | last = search_start; |
31f3c99b | 655 | full_search = 1; |
0ef3e66b | 656 | factor = 10; |
31f3c99b CM |
657 | goto again; |
658 | } | |
be744175 | 659 | found: |
d2fb3437 | 660 | return group_start; |
925baedd | 661 | } |
0f9dd46c | 662 | |
e02119d5 | 663 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 664 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
665 | { |
666 | int ret; | |
667 | struct btrfs_key key; | |
31840ae1 | 668 | struct btrfs_path *path; |
e02119d5 | 669 | |
31840ae1 ZY |
670 | path = btrfs_alloc_path(); |
671 | BUG_ON(!path); | |
e02119d5 CM |
672 | key.objectid = start; |
673 | key.offset = len; | |
674 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
675 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
676 | 0, 0); | |
31840ae1 | 677 | btrfs_free_path(path); |
7bb86316 CM |
678 | return ret; |
679 | } | |
680 | ||
a22285a6 YZ |
681 | /* |
682 | * helper function to lookup reference count and flags of extent. | |
683 | * | |
684 | * the head node for delayed ref is used to store the sum of all the | |
685 | * reference count modifications queued up in the rbtree. the head | |
686 | * node may also store the extent flags to set. This way you can check | |
687 | * to see what the reference count and extent flags would be if all of | |
688 | * the delayed refs are not processed. | |
689 | */ | |
690 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
691 | struct btrfs_root *root, u64 bytenr, | |
692 | u64 num_bytes, u64 *refs, u64 *flags) | |
693 | { | |
694 | struct btrfs_delayed_ref_head *head; | |
695 | struct btrfs_delayed_ref_root *delayed_refs; | |
696 | struct btrfs_path *path; | |
697 | struct btrfs_extent_item *ei; | |
698 | struct extent_buffer *leaf; | |
699 | struct btrfs_key key; | |
700 | u32 item_size; | |
701 | u64 num_refs; | |
702 | u64 extent_flags; | |
703 | int ret; | |
704 | ||
705 | path = btrfs_alloc_path(); | |
706 | if (!path) | |
707 | return -ENOMEM; | |
708 | ||
709 | key.objectid = bytenr; | |
710 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
711 | key.offset = num_bytes; | |
712 | if (!trans) { | |
713 | path->skip_locking = 1; | |
714 | path->search_commit_root = 1; | |
715 | } | |
716 | again: | |
717 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
718 | &key, path, 0, 0); | |
719 | if (ret < 0) | |
720 | goto out_free; | |
721 | ||
722 | if (ret == 0) { | |
723 | leaf = path->nodes[0]; | |
724 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
725 | if (item_size >= sizeof(*ei)) { | |
726 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
727 | struct btrfs_extent_item); | |
728 | num_refs = btrfs_extent_refs(leaf, ei); | |
729 | extent_flags = btrfs_extent_flags(leaf, ei); | |
730 | } else { | |
731 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
732 | struct btrfs_extent_item_v0 *ei0; | |
733 | BUG_ON(item_size != sizeof(*ei0)); | |
734 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
735 | struct btrfs_extent_item_v0); | |
736 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
737 | /* FIXME: this isn't correct for data */ | |
738 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
739 | #else | |
740 | BUG(); | |
741 | #endif | |
742 | } | |
743 | BUG_ON(num_refs == 0); | |
744 | } else { | |
745 | num_refs = 0; | |
746 | extent_flags = 0; | |
747 | ret = 0; | |
748 | } | |
749 | ||
750 | if (!trans) | |
751 | goto out; | |
752 | ||
753 | delayed_refs = &trans->transaction->delayed_refs; | |
754 | spin_lock(&delayed_refs->lock); | |
755 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
756 | if (head) { | |
757 | if (!mutex_trylock(&head->mutex)) { | |
758 | atomic_inc(&head->node.refs); | |
759 | spin_unlock(&delayed_refs->lock); | |
760 | ||
b3b4aa74 | 761 | btrfs_release_path(path); |
a22285a6 | 762 | |
8cc33e5c DS |
763 | /* |
764 | * Mutex was contended, block until it's released and try | |
765 | * again | |
766 | */ | |
a22285a6 YZ |
767 | mutex_lock(&head->mutex); |
768 | mutex_unlock(&head->mutex); | |
769 | btrfs_put_delayed_ref(&head->node); | |
770 | goto again; | |
771 | } | |
772 | if (head->extent_op && head->extent_op->update_flags) | |
773 | extent_flags |= head->extent_op->flags_to_set; | |
774 | else | |
775 | BUG_ON(num_refs == 0); | |
776 | ||
777 | num_refs += head->node.ref_mod; | |
778 | mutex_unlock(&head->mutex); | |
779 | } | |
780 | spin_unlock(&delayed_refs->lock); | |
781 | out: | |
782 | WARN_ON(num_refs == 0); | |
783 | if (refs) | |
784 | *refs = num_refs; | |
785 | if (flags) | |
786 | *flags = extent_flags; | |
787 | out_free: | |
788 | btrfs_free_path(path); | |
789 | return ret; | |
790 | } | |
791 | ||
d8d5f3e1 CM |
792 | /* |
793 | * Back reference rules. Back refs have three main goals: | |
794 | * | |
795 | * 1) differentiate between all holders of references to an extent so that | |
796 | * when a reference is dropped we can make sure it was a valid reference | |
797 | * before freeing the extent. | |
798 | * | |
799 | * 2) Provide enough information to quickly find the holders of an extent | |
800 | * if we notice a given block is corrupted or bad. | |
801 | * | |
802 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
803 | * maintenance. This is actually the same as #2, but with a slightly | |
804 | * different use case. | |
805 | * | |
5d4f98a2 YZ |
806 | * There are two kinds of back refs. The implicit back refs is optimized |
807 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
808 | * back refs of this kind provide information about the block's owner tree | |
809 | * and the pointer's key. These information allow us to find the block by | |
810 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
811 | * referenced by their owner trees. The location of tree block is recorded | |
812 | * in the back refs. Actually the full back refs is generic, and can be | |
813 | * used in all cases the implicit back refs is used. The major shortcoming | |
814 | * of the full back refs is its overhead. Every time a tree block gets | |
815 | * COWed, we have to update back refs entry for all pointers in it. | |
816 | * | |
817 | * For a newly allocated tree block, we use implicit back refs for | |
818 | * pointers in it. This means most tree related operations only involve | |
819 | * implicit back refs. For a tree block created in old transaction, the | |
820 | * only way to drop a reference to it is COW it. So we can detect the | |
821 | * event that tree block loses its owner tree's reference and do the | |
822 | * back refs conversion. | |
823 | * | |
824 | * When a tree block is COW'd through a tree, there are four cases: | |
825 | * | |
826 | * The reference count of the block is one and the tree is the block's | |
827 | * owner tree. Nothing to do in this case. | |
828 | * | |
829 | * The reference count of the block is one and the tree is not the | |
830 | * block's owner tree. In this case, full back refs is used for pointers | |
831 | * in the block. Remove these full back refs, add implicit back refs for | |
832 | * every pointers in the new block. | |
833 | * | |
834 | * The reference count of the block is greater than one and the tree is | |
835 | * the block's owner tree. In this case, implicit back refs is used for | |
836 | * pointers in the block. Add full back refs for every pointers in the | |
837 | * block, increase lower level extents' reference counts. The original | |
838 | * implicit back refs are entailed to the new block. | |
839 | * | |
840 | * The reference count of the block is greater than one and the tree is | |
841 | * not the block's owner tree. Add implicit back refs for every pointer in | |
842 | * the new block, increase lower level extents' reference count. | |
843 | * | |
844 | * Back Reference Key composing: | |
845 | * | |
846 | * The key objectid corresponds to the first byte in the extent, | |
847 | * The key type is used to differentiate between types of back refs. | |
848 | * There are different meanings of the key offset for different types | |
849 | * of back refs. | |
850 | * | |
d8d5f3e1 CM |
851 | * File extents can be referenced by: |
852 | * | |
853 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 854 | * - different files inside a single subvolume |
d8d5f3e1 CM |
855 | * - different offsets inside a file (bookend extents in file.c) |
856 | * | |
5d4f98a2 | 857 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
858 | * |
859 | * - Objectid of the subvolume root | |
d8d5f3e1 | 860 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
861 | * - original offset in the file |
862 | * - how many bookend extents | |
d8d5f3e1 | 863 | * |
5d4f98a2 YZ |
864 | * The key offset for the implicit back refs is hash of the first |
865 | * three fields. | |
d8d5f3e1 | 866 | * |
5d4f98a2 | 867 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 868 | * |
5d4f98a2 | 869 | * - number of pointers in the tree leaf |
d8d5f3e1 | 870 | * |
5d4f98a2 YZ |
871 | * The key offset for the implicit back refs is the first byte of |
872 | * the tree leaf | |
d8d5f3e1 | 873 | * |
5d4f98a2 YZ |
874 | * When a file extent is allocated, The implicit back refs is used. |
875 | * the fields are filled in: | |
d8d5f3e1 | 876 | * |
5d4f98a2 | 877 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 878 | * |
5d4f98a2 YZ |
879 | * When a file extent is removed file truncation, we find the |
880 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 881 | * |
5d4f98a2 | 882 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 883 | * |
5d4f98a2 | 884 | * Btree extents can be referenced by: |
d8d5f3e1 | 885 | * |
5d4f98a2 | 886 | * - Different subvolumes |
d8d5f3e1 | 887 | * |
5d4f98a2 YZ |
888 | * Both the implicit back refs and the full back refs for tree blocks |
889 | * only consist of key. The key offset for the implicit back refs is | |
890 | * objectid of block's owner tree. The key offset for the full back refs | |
891 | * is the first byte of parent block. | |
d8d5f3e1 | 892 | * |
5d4f98a2 YZ |
893 | * When implicit back refs is used, information about the lowest key and |
894 | * level of the tree block are required. These information are stored in | |
895 | * tree block info structure. | |
d8d5f3e1 | 896 | */ |
31840ae1 | 897 | |
5d4f98a2 YZ |
898 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
899 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
900 | struct btrfs_root *root, | |
901 | struct btrfs_path *path, | |
902 | u64 owner, u32 extra_size) | |
7bb86316 | 903 | { |
5d4f98a2 YZ |
904 | struct btrfs_extent_item *item; |
905 | struct btrfs_extent_item_v0 *ei0; | |
906 | struct btrfs_extent_ref_v0 *ref0; | |
907 | struct btrfs_tree_block_info *bi; | |
908 | struct extent_buffer *leaf; | |
7bb86316 | 909 | struct btrfs_key key; |
5d4f98a2 YZ |
910 | struct btrfs_key found_key; |
911 | u32 new_size = sizeof(*item); | |
912 | u64 refs; | |
913 | int ret; | |
914 | ||
915 | leaf = path->nodes[0]; | |
916 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
917 | ||
918 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
919 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
920 | struct btrfs_extent_item_v0); | |
921 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
922 | ||
923 | if (owner == (u64)-1) { | |
924 | while (1) { | |
925 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
926 | ret = btrfs_next_leaf(root, path); | |
927 | if (ret < 0) | |
928 | return ret; | |
929 | BUG_ON(ret > 0); | |
930 | leaf = path->nodes[0]; | |
931 | } | |
932 | btrfs_item_key_to_cpu(leaf, &found_key, | |
933 | path->slots[0]); | |
934 | BUG_ON(key.objectid != found_key.objectid); | |
935 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
936 | path->slots[0]++; | |
937 | continue; | |
938 | } | |
939 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
940 | struct btrfs_extent_ref_v0); | |
941 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
942 | break; | |
943 | } | |
944 | } | |
b3b4aa74 | 945 | btrfs_release_path(path); |
5d4f98a2 YZ |
946 | |
947 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
948 | new_size += sizeof(*bi); | |
949 | ||
950 | new_size -= sizeof(*ei0); | |
951 | ret = btrfs_search_slot(trans, root, &key, path, | |
952 | new_size + extra_size, 1); | |
953 | if (ret < 0) | |
954 | return ret; | |
955 | BUG_ON(ret); | |
956 | ||
957 | ret = btrfs_extend_item(trans, root, path, new_size); | |
5d4f98a2 YZ |
958 | |
959 | leaf = path->nodes[0]; | |
960 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
961 | btrfs_set_extent_refs(leaf, item, refs); | |
962 | /* FIXME: get real generation */ | |
963 | btrfs_set_extent_generation(leaf, item, 0); | |
964 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
965 | btrfs_set_extent_flags(leaf, item, | |
966 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
967 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
968 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
969 | /* FIXME: get first key of the block */ | |
970 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
971 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
972 | } else { | |
973 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
974 | } | |
975 | btrfs_mark_buffer_dirty(leaf); | |
976 | return 0; | |
977 | } | |
978 | #endif | |
979 | ||
980 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
981 | { | |
982 | u32 high_crc = ~(u32)0; | |
983 | u32 low_crc = ~(u32)0; | |
984 | __le64 lenum; | |
985 | ||
986 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 987 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 988 | lenum = cpu_to_le64(owner); |
163e783e | 989 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 990 | lenum = cpu_to_le64(offset); |
163e783e | 991 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
992 | |
993 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
994 | } | |
995 | ||
996 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
997 | struct btrfs_extent_data_ref *ref) | |
998 | { | |
999 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1000 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1001 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1002 | } | |
1003 | ||
1004 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1005 | struct btrfs_extent_data_ref *ref, | |
1006 | u64 root_objectid, u64 owner, u64 offset) | |
1007 | { | |
1008 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1009 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1010 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1011 | return 0; | |
1012 | return 1; | |
1013 | } | |
1014 | ||
1015 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1016 | struct btrfs_root *root, | |
1017 | struct btrfs_path *path, | |
1018 | u64 bytenr, u64 parent, | |
1019 | u64 root_objectid, | |
1020 | u64 owner, u64 offset) | |
1021 | { | |
1022 | struct btrfs_key key; | |
1023 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1024 | struct extent_buffer *leaf; |
5d4f98a2 | 1025 | u32 nritems; |
74493f7a | 1026 | int ret; |
5d4f98a2 YZ |
1027 | int recow; |
1028 | int err = -ENOENT; | |
74493f7a | 1029 | |
31840ae1 | 1030 | key.objectid = bytenr; |
5d4f98a2 YZ |
1031 | if (parent) { |
1032 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1033 | key.offset = parent; | |
1034 | } else { | |
1035 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1036 | key.offset = hash_extent_data_ref(root_objectid, | |
1037 | owner, offset); | |
1038 | } | |
1039 | again: | |
1040 | recow = 0; | |
1041 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1042 | if (ret < 0) { | |
1043 | err = ret; | |
1044 | goto fail; | |
1045 | } | |
31840ae1 | 1046 | |
5d4f98a2 YZ |
1047 | if (parent) { |
1048 | if (!ret) | |
1049 | return 0; | |
1050 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1051 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1052 | btrfs_release_path(path); |
5d4f98a2 YZ |
1053 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1054 | if (ret < 0) { | |
1055 | err = ret; | |
1056 | goto fail; | |
1057 | } | |
1058 | if (!ret) | |
1059 | return 0; | |
1060 | #endif | |
1061 | goto fail; | |
31840ae1 ZY |
1062 | } |
1063 | ||
1064 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1065 | nritems = btrfs_header_nritems(leaf); |
1066 | while (1) { | |
1067 | if (path->slots[0] >= nritems) { | |
1068 | ret = btrfs_next_leaf(root, path); | |
1069 | if (ret < 0) | |
1070 | err = ret; | |
1071 | if (ret) | |
1072 | goto fail; | |
1073 | ||
1074 | leaf = path->nodes[0]; | |
1075 | nritems = btrfs_header_nritems(leaf); | |
1076 | recow = 1; | |
1077 | } | |
1078 | ||
1079 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1080 | if (key.objectid != bytenr || | |
1081 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1082 | goto fail; | |
1083 | ||
1084 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1085 | struct btrfs_extent_data_ref); | |
1086 | ||
1087 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1088 | owner, offset)) { | |
1089 | if (recow) { | |
b3b4aa74 | 1090 | btrfs_release_path(path); |
5d4f98a2 YZ |
1091 | goto again; |
1092 | } | |
1093 | err = 0; | |
1094 | break; | |
1095 | } | |
1096 | path->slots[0]++; | |
31840ae1 | 1097 | } |
5d4f98a2 YZ |
1098 | fail: |
1099 | return err; | |
31840ae1 ZY |
1100 | } |
1101 | ||
5d4f98a2 YZ |
1102 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1103 | struct btrfs_root *root, | |
1104 | struct btrfs_path *path, | |
1105 | u64 bytenr, u64 parent, | |
1106 | u64 root_objectid, u64 owner, | |
1107 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1108 | { |
1109 | struct btrfs_key key; | |
1110 | struct extent_buffer *leaf; | |
5d4f98a2 | 1111 | u32 size; |
31840ae1 ZY |
1112 | u32 num_refs; |
1113 | int ret; | |
74493f7a | 1114 | |
74493f7a | 1115 | key.objectid = bytenr; |
5d4f98a2 YZ |
1116 | if (parent) { |
1117 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1118 | key.offset = parent; | |
1119 | size = sizeof(struct btrfs_shared_data_ref); | |
1120 | } else { | |
1121 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1122 | key.offset = hash_extent_data_ref(root_objectid, | |
1123 | owner, offset); | |
1124 | size = sizeof(struct btrfs_extent_data_ref); | |
1125 | } | |
74493f7a | 1126 | |
5d4f98a2 YZ |
1127 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1128 | if (ret && ret != -EEXIST) | |
1129 | goto fail; | |
1130 | ||
1131 | leaf = path->nodes[0]; | |
1132 | if (parent) { | |
1133 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1134 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1135 | struct btrfs_shared_data_ref); |
1136 | if (ret == 0) { | |
1137 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1138 | } else { | |
1139 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1140 | num_refs += refs_to_add; | |
1141 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1142 | } |
5d4f98a2 YZ |
1143 | } else { |
1144 | struct btrfs_extent_data_ref *ref; | |
1145 | while (ret == -EEXIST) { | |
1146 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1147 | struct btrfs_extent_data_ref); | |
1148 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1149 | owner, offset)) | |
1150 | break; | |
b3b4aa74 | 1151 | btrfs_release_path(path); |
5d4f98a2 YZ |
1152 | key.offset++; |
1153 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1154 | size); | |
1155 | if (ret && ret != -EEXIST) | |
1156 | goto fail; | |
31840ae1 | 1157 | |
5d4f98a2 YZ |
1158 | leaf = path->nodes[0]; |
1159 | } | |
1160 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1161 | struct btrfs_extent_data_ref); | |
1162 | if (ret == 0) { | |
1163 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1164 | root_objectid); | |
1165 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1166 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1167 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1168 | } else { | |
1169 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1170 | num_refs += refs_to_add; | |
1171 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1172 | } |
31840ae1 | 1173 | } |
5d4f98a2 YZ |
1174 | btrfs_mark_buffer_dirty(leaf); |
1175 | ret = 0; | |
1176 | fail: | |
b3b4aa74 | 1177 | btrfs_release_path(path); |
7bb86316 | 1178 | return ret; |
74493f7a CM |
1179 | } |
1180 | ||
5d4f98a2 YZ |
1181 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1182 | struct btrfs_root *root, | |
1183 | struct btrfs_path *path, | |
1184 | int refs_to_drop) | |
31840ae1 | 1185 | { |
5d4f98a2 YZ |
1186 | struct btrfs_key key; |
1187 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1188 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1189 | struct extent_buffer *leaf; |
5d4f98a2 | 1190 | u32 num_refs = 0; |
31840ae1 ZY |
1191 | int ret = 0; |
1192 | ||
1193 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1194 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1195 | ||
1196 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1197 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1198 | struct btrfs_extent_data_ref); | |
1199 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1200 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1201 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1202 | struct btrfs_shared_data_ref); | |
1203 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1204 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1205 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1206 | struct btrfs_extent_ref_v0 *ref0; | |
1207 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1208 | struct btrfs_extent_ref_v0); | |
1209 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1210 | #endif | |
1211 | } else { | |
1212 | BUG(); | |
1213 | } | |
1214 | ||
56bec294 CM |
1215 | BUG_ON(num_refs < refs_to_drop); |
1216 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1217 | |
31840ae1 ZY |
1218 | if (num_refs == 0) { |
1219 | ret = btrfs_del_item(trans, root, path); | |
1220 | } else { | |
5d4f98a2 YZ |
1221 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1222 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1223 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1224 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1225 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1226 | else { | |
1227 | struct btrfs_extent_ref_v0 *ref0; | |
1228 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1229 | struct btrfs_extent_ref_v0); | |
1230 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1231 | } | |
1232 | #endif | |
31840ae1 ZY |
1233 | btrfs_mark_buffer_dirty(leaf); |
1234 | } | |
31840ae1 ZY |
1235 | return ret; |
1236 | } | |
1237 | ||
5d4f98a2 YZ |
1238 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1239 | struct btrfs_path *path, | |
1240 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1241 | { |
5d4f98a2 YZ |
1242 | struct btrfs_key key; |
1243 | struct extent_buffer *leaf; | |
1244 | struct btrfs_extent_data_ref *ref1; | |
1245 | struct btrfs_shared_data_ref *ref2; | |
1246 | u32 num_refs = 0; | |
1247 | ||
1248 | leaf = path->nodes[0]; | |
1249 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1250 | if (iref) { | |
1251 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1252 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1253 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1254 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1255 | } else { | |
1256 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1257 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1258 | } | |
1259 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1260 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1261 | struct btrfs_extent_data_ref); | |
1262 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1263 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1264 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1265 | struct btrfs_shared_data_ref); | |
1266 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1267 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1268 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1269 | struct btrfs_extent_ref_v0 *ref0; | |
1270 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1271 | struct btrfs_extent_ref_v0); | |
1272 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1273 | #endif |
5d4f98a2 YZ |
1274 | } else { |
1275 | WARN_ON(1); | |
1276 | } | |
1277 | return num_refs; | |
1278 | } | |
15916de8 | 1279 | |
5d4f98a2 YZ |
1280 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1281 | struct btrfs_root *root, | |
1282 | struct btrfs_path *path, | |
1283 | u64 bytenr, u64 parent, | |
1284 | u64 root_objectid) | |
1f3c79a2 | 1285 | { |
5d4f98a2 | 1286 | struct btrfs_key key; |
1f3c79a2 | 1287 | int ret; |
1f3c79a2 | 1288 | |
5d4f98a2 YZ |
1289 | key.objectid = bytenr; |
1290 | if (parent) { | |
1291 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1292 | key.offset = parent; | |
1293 | } else { | |
1294 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1295 | key.offset = root_objectid; | |
1f3c79a2 LH |
1296 | } |
1297 | ||
5d4f98a2 YZ |
1298 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1299 | if (ret > 0) | |
1300 | ret = -ENOENT; | |
1301 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1302 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1303 | btrfs_release_path(path); |
5d4f98a2 YZ |
1304 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1305 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1306 | if (ret > 0) | |
1307 | ret = -ENOENT; | |
1308 | } | |
1f3c79a2 | 1309 | #endif |
5d4f98a2 | 1310 | return ret; |
1f3c79a2 LH |
1311 | } |
1312 | ||
5d4f98a2 YZ |
1313 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1314 | struct btrfs_root *root, | |
1315 | struct btrfs_path *path, | |
1316 | u64 bytenr, u64 parent, | |
1317 | u64 root_objectid) | |
31840ae1 | 1318 | { |
5d4f98a2 | 1319 | struct btrfs_key key; |
31840ae1 | 1320 | int ret; |
31840ae1 | 1321 | |
5d4f98a2 YZ |
1322 | key.objectid = bytenr; |
1323 | if (parent) { | |
1324 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1325 | key.offset = parent; | |
1326 | } else { | |
1327 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1328 | key.offset = root_objectid; | |
1329 | } | |
1330 | ||
1331 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1332 | btrfs_release_path(path); |
31840ae1 ZY |
1333 | return ret; |
1334 | } | |
1335 | ||
5d4f98a2 | 1336 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1337 | { |
5d4f98a2 YZ |
1338 | int type; |
1339 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1340 | if (parent > 0) | |
1341 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1342 | else | |
1343 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1344 | } else { | |
1345 | if (parent > 0) | |
1346 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1347 | else | |
1348 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1349 | } | |
1350 | return type; | |
31840ae1 | 1351 | } |
56bec294 | 1352 | |
2c47e605 YZ |
1353 | static int find_next_key(struct btrfs_path *path, int level, |
1354 | struct btrfs_key *key) | |
56bec294 | 1355 | |
02217ed2 | 1356 | { |
2c47e605 | 1357 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1358 | if (!path->nodes[level]) |
1359 | break; | |
5d4f98a2 YZ |
1360 | if (path->slots[level] + 1 >= |
1361 | btrfs_header_nritems(path->nodes[level])) | |
1362 | continue; | |
1363 | if (level == 0) | |
1364 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1365 | path->slots[level] + 1); | |
1366 | else | |
1367 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1368 | path->slots[level] + 1); | |
1369 | return 0; | |
1370 | } | |
1371 | return 1; | |
1372 | } | |
037e6390 | 1373 | |
5d4f98a2 YZ |
1374 | /* |
1375 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1376 | * to the address of inline back ref, and 0 is returned. | |
1377 | * | |
1378 | * if back ref isn't found, *ref_ret is set to the address where it | |
1379 | * should be inserted, and -ENOENT is returned. | |
1380 | * | |
1381 | * if insert is true and there are too many inline back refs, the path | |
1382 | * points to the extent item, and -EAGAIN is returned. | |
1383 | * | |
1384 | * NOTE: inline back refs are ordered in the same way that back ref | |
1385 | * items in the tree are ordered. | |
1386 | */ | |
1387 | static noinline_for_stack | |
1388 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1389 | struct btrfs_root *root, | |
1390 | struct btrfs_path *path, | |
1391 | struct btrfs_extent_inline_ref **ref_ret, | |
1392 | u64 bytenr, u64 num_bytes, | |
1393 | u64 parent, u64 root_objectid, | |
1394 | u64 owner, u64 offset, int insert) | |
1395 | { | |
1396 | struct btrfs_key key; | |
1397 | struct extent_buffer *leaf; | |
1398 | struct btrfs_extent_item *ei; | |
1399 | struct btrfs_extent_inline_ref *iref; | |
1400 | u64 flags; | |
1401 | u64 item_size; | |
1402 | unsigned long ptr; | |
1403 | unsigned long end; | |
1404 | int extra_size; | |
1405 | int type; | |
1406 | int want; | |
1407 | int ret; | |
1408 | int err = 0; | |
26b8003f | 1409 | |
db94535d | 1410 | key.objectid = bytenr; |
31840ae1 | 1411 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1412 | key.offset = num_bytes; |
31840ae1 | 1413 | |
5d4f98a2 YZ |
1414 | want = extent_ref_type(parent, owner); |
1415 | if (insert) { | |
1416 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1417 | path->keep_locks = 1; |
5d4f98a2 YZ |
1418 | } else |
1419 | extra_size = -1; | |
1420 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1421 | if (ret < 0) { |
5d4f98a2 YZ |
1422 | err = ret; |
1423 | goto out; | |
1424 | } | |
1425 | BUG_ON(ret); | |
1426 | ||
1427 | leaf = path->nodes[0]; | |
1428 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1429 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1430 | if (item_size < sizeof(*ei)) { | |
1431 | if (!insert) { | |
1432 | err = -ENOENT; | |
1433 | goto out; | |
1434 | } | |
1435 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1436 | extra_size); | |
1437 | if (ret < 0) { | |
1438 | err = ret; | |
1439 | goto out; | |
1440 | } | |
1441 | leaf = path->nodes[0]; | |
1442 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1443 | } | |
1444 | #endif | |
1445 | BUG_ON(item_size < sizeof(*ei)); | |
1446 | ||
5d4f98a2 YZ |
1447 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1448 | flags = btrfs_extent_flags(leaf, ei); | |
1449 | ||
1450 | ptr = (unsigned long)(ei + 1); | |
1451 | end = (unsigned long)ei + item_size; | |
1452 | ||
1453 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1454 | ptr += sizeof(struct btrfs_tree_block_info); | |
1455 | BUG_ON(ptr > end); | |
1456 | } else { | |
1457 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1458 | } | |
1459 | ||
1460 | err = -ENOENT; | |
1461 | while (1) { | |
1462 | if (ptr >= end) { | |
1463 | WARN_ON(ptr > end); | |
1464 | break; | |
1465 | } | |
1466 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1467 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1468 | if (want < type) | |
1469 | break; | |
1470 | if (want > type) { | |
1471 | ptr += btrfs_extent_inline_ref_size(type); | |
1472 | continue; | |
1473 | } | |
1474 | ||
1475 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1476 | struct btrfs_extent_data_ref *dref; | |
1477 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1478 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1479 | owner, offset)) { | |
1480 | err = 0; | |
1481 | break; | |
1482 | } | |
1483 | if (hash_extent_data_ref_item(leaf, dref) < | |
1484 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1485 | break; | |
1486 | } else { | |
1487 | u64 ref_offset; | |
1488 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1489 | if (parent > 0) { | |
1490 | if (parent == ref_offset) { | |
1491 | err = 0; | |
1492 | break; | |
1493 | } | |
1494 | if (ref_offset < parent) | |
1495 | break; | |
1496 | } else { | |
1497 | if (root_objectid == ref_offset) { | |
1498 | err = 0; | |
1499 | break; | |
1500 | } | |
1501 | if (ref_offset < root_objectid) | |
1502 | break; | |
1503 | } | |
1504 | } | |
1505 | ptr += btrfs_extent_inline_ref_size(type); | |
1506 | } | |
1507 | if (err == -ENOENT && insert) { | |
1508 | if (item_size + extra_size >= | |
1509 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1510 | err = -EAGAIN; | |
1511 | goto out; | |
1512 | } | |
1513 | /* | |
1514 | * To add new inline back ref, we have to make sure | |
1515 | * there is no corresponding back ref item. | |
1516 | * For simplicity, we just do not add new inline back | |
1517 | * ref if there is any kind of item for this block | |
1518 | */ | |
2c47e605 YZ |
1519 | if (find_next_key(path, 0, &key) == 0 && |
1520 | key.objectid == bytenr && | |
85d4198e | 1521 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1522 | err = -EAGAIN; |
1523 | goto out; | |
1524 | } | |
1525 | } | |
1526 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1527 | out: | |
85d4198e | 1528 | if (insert) { |
5d4f98a2 YZ |
1529 | path->keep_locks = 0; |
1530 | btrfs_unlock_up_safe(path, 1); | |
1531 | } | |
1532 | return err; | |
1533 | } | |
1534 | ||
1535 | /* | |
1536 | * helper to add new inline back ref | |
1537 | */ | |
1538 | static noinline_for_stack | |
1539 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1540 | struct btrfs_root *root, | |
1541 | struct btrfs_path *path, | |
1542 | struct btrfs_extent_inline_ref *iref, | |
1543 | u64 parent, u64 root_objectid, | |
1544 | u64 owner, u64 offset, int refs_to_add, | |
1545 | struct btrfs_delayed_extent_op *extent_op) | |
1546 | { | |
1547 | struct extent_buffer *leaf; | |
1548 | struct btrfs_extent_item *ei; | |
1549 | unsigned long ptr; | |
1550 | unsigned long end; | |
1551 | unsigned long item_offset; | |
1552 | u64 refs; | |
1553 | int size; | |
1554 | int type; | |
1555 | int ret; | |
1556 | ||
1557 | leaf = path->nodes[0]; | |
1558 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1559 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1560 | ||
1561 | type = extent_ref_type(parent, owner); | |
1562 | size = btrfs_extent_inline_ref_size(type); | |
1563 | ||
1564 | ret = btrfs_extend_item(trans, root, path, size); | |
5d4f98a2 YZ |
1565 | |
1566 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1567 | refs = btrfs_extent_refs(leaf, ei); | |
1568 | refs += refs_to_add; | |
1569 | btrfs_set_extent_refs(leaf, ei, refs); | |
1570 | if (extent_op) | |
1571 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1572 | ||
1573 | ptr = (unsigned long)ei + item_offset; | |
1574 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1575 | if (ptr < end - size) | |
1576 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1577 | end - size - ptr); | |
1578 | ||
1579 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1580 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1581 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1582 | struct btrfs_extent_data_ref *dref; | |
1583 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1584 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1585 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1586 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1587 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1588 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1589 | struct btrfs_shared_data_ref *sref; | |
1590 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1591 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1592 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1593 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1594 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1595 | } else { | |
1596 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1597 | } | |
1598 | btrfs_mark_buffer_dirty(leaf); | |
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1603 | struct btrfs_root *root, | |
1604 | struct btrfs_path *path, | |
1605 | struct btrfs_extent_inline_ref **ref_ret, | |
1606 | u64 bytenr, u64 num_bytes, u64 parent, | |
1607 | u64 root_objectid, u64 owner, u64 offset) | |
1608 | { | |
1609 | int ret; | |
1610 | ||
1611 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1612 | bytenr, num_bytes, parent, | |
1613 | root_objectid, owner, offset, 0); | |
1614 | if (ret != -ENOENT) | |
54aa1f4d | 1615 | return ret; |
5d4f98a2 | 1616 | |
b3b4aa74 | 1617 | btrfs_release_path(path); |
5d4f98a2 YZ |
1618 | *ref_ret = NULL; |
1619 | ||
1620 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1621 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1622 | root_objectid); | |
1623 | } else { | |
1624 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1625 | root_objectid, owner, offset); | |
b9473439 | 1626 | } |
5d4f98a2 YZ |
1627 | return ret; |
1628 | } | |
31840ae1 | 1629 | |
5d4f98a2 YZ |
1630 | /* |
1631 | * helper to update/remove inline back ref | |
1632 | */ | |
1633 | static noinline_for_stack | |
1634 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1635 | struct btrfs_root *root, | |
1636 | struct btrfs_path *path, | |
1637 | struct btrfs_extent_inline_ref *iref, | |
1638 | int refs_to_mod, | |
1639 | struct btrfs_delayed_extent_op *extent_op) | |
1640 | { | |
1641 | struct extent_buffer *leaf; | |
1642 | struct btrfs_extent_item *ei; | |
1643 | struct btrfs_extent_data_ref *dref = NULL; | |
1644 | struct btrfs_shared_data_ref *sref = NULL; | |
1645 | unsigned long ptr; | |
1646 | unsigned long end; | |
1647 | u32 item_size; | |
1648 | int size; | |
1649 | int type; | |
1650 | int ret; | |
1651 | u64 refs; | |
1652 | ||
1653 | leaf = path->nodes[0]; | |
1654 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1655 | refs = btrfs_extent_refs(leaf, ei); | |
1656 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1657 | refs += refs_to_mod; | |
1658 | btrfs_set_extent_refs(leaf, ei, refs); | |
1659 | if (extent_op) | |
1660 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1661 | ||
1662 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1663 | ||
1664 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1665 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1666 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1667 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1668 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1669 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1670 | } else { | |
1671 | refs = 1; | |
1672 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1673 | } |
31840ae1 | 1674 | |
5d4f98a2 YZ |
1675 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1676 | refs += refs_to_mod; | |
1677 | ||
1678 | if (refs > 0) { | |
1679 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1680 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1681 | else | |
1682 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1683 | } else { | |
1684 | size = btrfs_extent_inline_ref_size(type); | |
1685 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1686 | ptr = (unsigned long)iref; | |
1687 | end = (unsigned long)ei + item_size; | |
1688 | if (ptr + size < end) | |
1689 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1690 | end - ptr - size); | |
1691 | item_size -= size; | |
1692 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
5d4f98a2 YZ |
1693 | } |
1694 | btrfs_mark_buffer_dirty(leaf); | |
1695 | return 0; | |
1696 | } | |
1697 | ||
1698 | static noinline_for_stack | |
1699 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1700 | struct btrfs_root *root, | |
1701 | struct btrfs_path *path, | |
1702 | u64 bytenr, u64 num_bytes, u64 parent, | |
1703 | u64 root_objectid, u64 owner, | |
1704 | u64 offset, int refs_to_add, | |
1705 | struct btrfs_delayed_extent_op *extent_op) | |
1706 | { | |
1707 | struct btrfs_extent_inline_ref *iref; | |
1708 | int ret; | |
1709 | ||
1710 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1711 | bytenr, num_bytes, parent, | |
1712 | root_objectid, owner, offset, 1); | |
1713 | if (ret == 0) { | |
1714 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1715 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1716 | refs_to_add, extent_op); | |
1717 | } else if (ret == -ENOENT) { | |
1718 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1719 | parent, root_objectid, | |
1720 | owner, offset, refs_to_add, | |
1721 | extent_op); | |
771ed689 | 1722 | } |
5d4f98a2 YZ |
1723 | return ret; |
1724 | } | |
31840ae1 | 1725 | |
5d4f98a2 YZ |
1726 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1727 | struct btrfs_root *root, | |
1728 | struct btrfs_path *path, | |
1729 | u64 bytenr, u64 parent, u64 root_objectid, | |
1730 | u64 owner, u64 offset, int refs_to_add) | |
1731 | { | |
1732 | int ret; | |
1733 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1734 | BUG_ON(refs_to_add != 1); | |
1735 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1736 | parent, root_objectid); | |
1737 | } else { | |
1738 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1739 | parent, root_objectid, | |
1740 | owner, offset, refs_to_add); | |
1741 | } | |
1742 | return ret; | |
1743 | } | |
56bec294 | 1744 | |
5d4f98a2 YZ |
1745 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1746 | struct btrfs_root *root, | |
1747 | struct btrfs_path *path, | |
1748 | struct btrfs_extent_inline_ref *iref, | |
1749 | int refs_to_drop, int is_data) | |
1750 | { | |
1751 | int ret; | |
b9473439 | 1752 | |
5d4f98a2 YZ |
1753 | BUG_ON(!is_data && refs_to_drop != 1); |
1754 | if (iref) { | |
1755 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1756 | -refs_to_drop, NULL); | |
1757 | } else if (is_data) { | |
1758 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1759 | } else { | |
1760 | ret = btrfs_del_item(trans, root, path); | |
1761 | } | |
1762 | return ret; | |
1763 | } | |
1764 | ||
5378e607 | 1765 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1766 | u64 start, u64 len) |
1767 | { | |
5378e607 | 1768 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1769 | } |
5d4f98a2 YZ |
1770 | |
1771 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1772 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1773 | { |
5d4f98a2 | 1774 | int ret; |
5378e607 | 1775 | u64 discarded_bytes = 0; |
5d4f98a2 YZ |
1776 | struct btrfs_multi_bio *multi = NULL; |
1777 | ||
e244a0ae | 1778 | |
5d4f98a2 | 1779 | /* Tell the block device(s) that the sectors can be discarded */ |
5378e607 LD |
1780 | ret = btrfs_map_block(&root->fs_info->mapping_tree, REQ_DISCARD, |
1781 | bytenr, &num_bytes, &multi, 0); | |
5d4f98a2 YZ |
1782 | if (!ret) { |
1783 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1784 | int i; | |
1785 | ||
5d4f98a2 YZ |
1786 | |
1787 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
5378e607 LD |
1788 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1789 | stripe->physical, | |
1790 | stripe->length); | |
1791 | if (!ret) | |
1792 | discarded_bytes += stripe->length; | |
1793 | else if (ret != -EOPNOTSUPP) | |
1794 | break; | |
5d4f98a2 YZ |
1795 | } |
1796 | kfree(multi); | |
1797 | } | |
5378e607 LD |
1798 | if (discarded_bytes && ret == -EOPNOTSUPP) |
1799 | ret = 0; | |
1800 | ||
1801 | if (actual_bytes) | |
1802 | *actual_bytes = discarded_bytes; | |
1803 | ||
5d4f98a2 YZ |
1804 | |
1805 | return ret; | |
5d4f98a2 YZ |
1806 | } |
1807 | ||
1808 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1809 | struct btrfs_root *root, | |
1810 | u64 bytenr, u64 num_bytes, u64 parent, | |
1811 | u64 root_objectid, u64 owner, u64 offset) | |
1812 | { | |
1813 | int ret; | |
1814 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1815 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1816 | ||
1817 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1818 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1819 | parent, root_objectid, (int)owner, | |
1820 | BTRFS_ADD_DELAYED_REF, NULL); | |
1821 | } else { | |
1822 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1823 | parent, root_objectid, owner, offset, | |
1824 | BTRFS_ADD_DELAYED_REF, NULL); | |
1825 | } | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1829 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1830 | struct btrfs_root *root, | |
1831 | u64 bytenr, u64 num_bytes, | |
1832 | u64 parent, u64 root_objectid, | |
1833 | u64 owner, u64 offset, int refs_to_add, | |
1834 | struct btrfs_delayed_extent_op *extent_op) | |
1835 | { | |
1836 | struct btrfs_path *path; | |
1837 | struct extent_buffer *leaf; | |
1838 | struct btrfs_extent_item *item; | |
1839 | u64 refs; | |
1840 | int ret; | |
1841 | int err = 0; | |
1842 | ||
1843 | path = btrfs_alloc_path(); | |
1844 | if (!path) | |
1845 | return -ENOMEM; | |
1846 | ||
1847 | path->reada = 1; | |
1848 | path->leave_spinning = 1; | |
1849 | /* this will setup the path even if it fails to insert the back ref */ | |
1850 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1851 | path, bytenr, num_bytes, parent, | |
1852 | root_objectid, owner, offset, | |
1853 | refs_to_add, extent_op); | |
1854 | if (ret == 0) | |
1855 | goto out; | |
1856 | ||
1857 | if (ret != -EAGAIN) { | |
1858 | err = ret; | |
1859 | goto out; | |
1860 | } | |
1861 | ||
1862 | leaf = path->nodes[0]; | |
1863 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1864 | refs = btrfs_extent_refs(leaf, item); | |
1865 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1866 | if (extent_op) | |
1867 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1868 | |
5d4f98a2 | 1869 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1870 | btrfs_release_path(path); |
56bec294 CM |
1871 | |
1872 | path->reada = 1; | |
b9473439 CM |
1873 | path->leave_spinning = 1; |
1874 | ||
56bec294 CM |
1875 | /* now insert the actual backref */ |
1876 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1877 | path, bytenr, parent, root_objectid, |
1878 | owner, offset, refs_to_add); | |
56bec294 | 1879 | BUG_ON(ret); |
5d4f98a2 | 1880 | out: |
56bec294 | 1881 | btrfs_free_path(path); |
5d4f98a2 | 1882 | return err; |
56bec294 CM |
1883 | } |
1884 | ||
5d4f98a2 YZ |
1885 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1886 | struct btrfs_root *root, | |
1887 | struct btrfs_delayed_ref_node *node, | |
1888 | struct btrfs_delayed_extent_op *extent_op, | |
1889 | int insert_reserved) | |
56bec294 | 1890 | { |
5d4f98a2 YZ |
1891 | int ret = 0; |
1892 | struct btrfs_delayed_data_ref *ref; | |
1893 | struct btrfs_key ins; | |
1894 | u64 parent = 0; | |
1895 | u64 ref_root = 0; | |
1896 | u64 flags = 0; | |
1897 | ||
1898 | ins.objectid = node->bytenr; | |
1899 | ins.offset = node->num_bytes; | |
1900 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1901 | ||
1902 | ref = btrfs_delayed_node_to_data_ref(node); | |
1903 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1904 | parent = ref->parent; | |
1905 | else | |
1906 | ref_root = ref->root; | |
1907 | ||
1908 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1909 | if (extent_op) { | |
1910 | BUG_ON(extent_op->update_key); | |
1911 | flags |= extent_op->flags_to_set; | |
1912 | } | |
1913 | ret = alloc_reserved_file_extent(trans, root, | |
1914 | parent, ref_root, flags, | |
1915 | ref->objectid, ref->offset, | |
1916 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1917 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1918 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1919 | node->num_bytes, parent, | |
1920 | ref_root, ref->objectid, | |
1921 | ref->offset, node->ref_mod, | |
1922 | extent_op); | |
1923 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1924 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1925 | node->num_bytes, parent, | |
1926 | ref_root, ref->objectid, | |
1927 | ref->offset, node->ref_mod, | |
1928 | extent_op); | |
1929 | } else { | |
1930 | BUG(); | |
1931 | } | |
1932 | return ret; | |
1933 | } | |
1934 | ||
1935 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1936 | struct extent_buffer *leaf, | |
1937 | struct btrfs_extent_item *ei) | |
1938 | { | |
1939 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1940 | if (extent_op->update_flags) { | |
1941 | flags |= extent_op->flags_to_set; | |
1942 | btrfs_set_extent_flags(leaf, ei, flags); | |
1943 | } | |
1944 | ||
1945 | if (extent_op->update_key) { | |
1946 | struct btrfs_tree_block_info *bi; | |
1947 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1948 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1949 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1950 | } | |
1951 | } | |
1952 | ||
1953 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1954 | struct btrfs_root *root, | |
1955 | struct btrfs_delayed_ref_node *node, | |
1956 | struct btrfs_delayed_extent_op *extent_op) | |
1957 | { | |
1958 | struct btrfs_key key; | |
1959 | struct btrfs_path *path; | |
1960 | struct btrfs_extent_item *ei; | |
1961 | struct extent_buffer *leaf; | |
1962 | u32 item_size; | |
56bec294 | 1963 | int ret; |
5d4f98a2 YZ |
1964 | int err = 0; |
1965 | ||
1966 | path = btrfs_alloc_path(); | |
1967 | if (!path) | |
1968 | return -ENOMEM; | |
1969 | ||
1970 | key.objectid = node->bytenr; | |
1971 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1972 | key.offset = node->num_bytes; | |
1973 | ||
1974 | path->reada = 1; | |
1975 | path->leave_spinning = 1; | |
1976 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1977 | path, 0, 1); | |
1978 | if (ret < 0) { | |
1979 | err = ret; | |
1980 | goto out; | |
1981 | } | |
1982 | if (ret > 0) { | |
1983 | err = -EIO; | |
1984 | goto out; | |
1985 | } | |
1986 | ||
1987 | leaf = path->nodes[0]; | |
1988 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1989 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1990 | if (item_size < sizeof(*ei)) { | |
1991 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
1992 | path, (u64)-1, 0); | |
1993 | if (ret < 0) { | |
1994 | err = ret; | |
1995 | goto out; | |
1996 | } | |
1997 | leaf = path->nodes[0]; | |
1998 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1999 | } | |
2000 | #endif | |
2001 | BUG_ON(item_size < sizeof(*ei)); | |
2002 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2003 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2004 | |
5d4f98a2 YZ |
2005 | btrfs_mark_buffer_dirty(leaf); |
2006 | out: | |
2007 | btrfs_free_path(path); | |
2008 | return err; | |
56bec294 CM |
2009 | } |
2010 | ||
5d4f98a2 YZ |
2011 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2012 | struct btrfs_root *root, | |
2013 | struct btrfs_delayed_ref_node *node, | |
2014 | struct btrfs_delayed_extent_op *extent_op, | |
2015 | int insert_reserved) | |
56bec294 CM |
2016 | { |
2017 | int ret = 0; | |
5d4f98a2 YZ |
2018 | struct btrfs_delayed_tree_ref *ref; |
2019 | struct btrfs_key ins; | |
2020 | u64 parent = 0; | |
2021 | u64 ref_root = 0; | |
56bec294 | 2022 | |
5d4f98a2 YZ |
2023 | ins.objectid = node->bytenr; |
2024 | ins.offset = node->num_bytes; | |
2025 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2026 | |
5d4f98a2 YZ |
2027 | ref = btrfs_delayed_node_to_tree_ref(node); |
2028 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2029 | parent = ref->parent; | |
2030 | else | |
2031 | ref_root = ref->root; | |
2032 | ||
2033 | BUG_ON(node->ref_mod != 1); | |
2034 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2035 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2036 | !extent_op->update_key); | |
2037 | ret = alloc_reserved_tree_block(trans, root, | |
2038 | parent, ref_root, | |
2039 | extent_op->flags_to_set, | |
2040 | &extent_op->key, | |
2041 | ref->level, &ins); | |
5d4f98a2 YZ |
2042 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2043 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2044 | node->num_bytes, parent, ref_root, | |
2045 | ref->level, 0, 1, extent_op); | |
2046 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2047 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2048 | node->num_bytes, parent, ref_root, | |
2049 | ref->level, 0, 1, extent_op); | |
2050 | } else { | |
2051 | BUG(); | |
2052 | } | |
56bec294 CM |
2053 | return ret; |
2054 | } | |
2055 | ||
2056 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2057 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2058 | struct btrfs_root *root, | |
2059 | struct btrfs_delayed_ref_node *node, | |
2060 | struct btrfs_delayed_extent_op *extent_op, | |
2061 | int insert_reserved) | |
56bec294 CM |
2062 | { |
2063 | int ret; | |
5d4f98a2 | 2064 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2065 | struct btrfs_delayed_ref_head *head; |
2066 | /* | |
2067 | * we've hit the end of the chain and we were supposed | |
2068 | * to insert this extent into the tree. But, it got | |
2069 | * deleted before we ever needed to insert it, so all | |
2070 | * we have to do is clean up the accounting | |
2071 | */ | |
5d4f98a2 YZ |
2072 | BUG_ON(extent_op); |
2073 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2074 | if (insert_reserved) { |
f0486c68 YZ |
2075 | btrfs_pin_extent(root, node->bytenr, |
2076 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2077 | if (head->is_data) { |
2078 | ret = btrfs_del_csums(trans, root, | |
2079 | node->bytenr, | |
2080 | node->num_bytes); | |
2081 | BUG_ON(ret); | |
2082 | } | |
56bec294 | 2083 | } |
56bec294 CM |
2084 | mutex_unlock(&head->mutex); |
2085 | return 0; | |
2086 | } | |
2087 | ||
5d4f98a2 YZ |
2088 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2089 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2090 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2091 | insert_reserved); | |
2092 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2093 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2094 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2095 | insert_reserved); | |
2096 | else | |
2097 | BUG(); | |
2098 | return ret; | |
56bec294 CM |
2099 | } |
2100 | ||
2101 | static noinline struct btrfs_delayed_ref_node * | |
2102 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2103 | { | |
2104 | struct rb_node *node; | |
2105 | struct btrfs_delayed_ref_node *ref; | |
2106 | int action = BTRFS_ADD_DELAYED_REF; | |
2107 | again: | |
2108 | /* | |
2109 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2110 | * this prevents ref count from going down to zero when | |
2111 | * there still are pending delayed ref. | |
2112 | */ | |
2113 | node = rb_prev(&head->node.rb_node); | |
2114 | while (1) { | |
2115 | if (!node) | |
2116 | break; | |
2117 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2118 | rb_node); | |
2119 | if (ref->bytenr != head->node.bytenr) | |
2120 | break; | |
5d4f98a2 | 2121 | if (ref->action == action) |
56bec294 CM |
2122 | return ref; |
2123 | node = rb_prev(node); | |
2124 | } | |
2125 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2126 | action = BTRFS_DROP_DELAYED_REF; | |
2127 | goto again; | |
2128 | } | |
2129 | return NULL; | |
2130 | } | |
2131 | ||
c3e69d58 CM |
2132 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2133 | struct btrfs_root *root, | |
2134 | struct list_head *cluster) | |
56bec294 | 2135 | { |
56bec294 CM |
2136 | struct btrfs_delayed_ref_root *delayed_refs; |
2137 | struct btrfs_delayed_ref_node *ref; | |
2138 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2139 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2140 | int ret; |
c3e69d58 | 2141 | int count = 0; |
56bec294 | 2142 | int must_insert_reserved = 0; |
56bec294 CM |
2143 | |
2144 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2145 | while (1) { |
2146 | if (!locked_ref) { | |
c3e69d58 CM |
2147 | /* pick a new head ref from the cluster list */ |
2148 | if (list_empty(cluster)) | |
56bec294 | 2149 | break; |
56bec294 | 2150 | |
c3e69d58 CM |
2151 | locked_ref = list_entry(cluster->next, |
2152 | struct btrfs_delayed_ref_head, cluster); | |
2153 | ||
2154 | /* grab the lock that says we are going to process | |
2155 | * all the refs for this head */ | |
2156 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2157 | ||
2158 | /* | |
2159 | * we may have dropped the spin lock to get the head | |
2160 | * mutex lock, and that might have given someone else | |
2161 | * time to free the head. If that's true, it has been | |
2162 | * removed from our list and we can move on. | |
2163 | */ | |
2164 | if (ret == -EAGAIN) { | |
2165 | locked_ref = NULL; | |
2166 | count++; | |
2167 | continue; | |
56bec294 CM |
2168 | } |
2169 | } | |
a28ec197 | 2170 | |
56bec294 CM |
2171 | /* |
2172 | * record the must insert reserved flag before we | |
2173 | * drop the spin lock. | |
2174 | */ | |
2175 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2176 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2177 | |
5d4f98a2 YZ |
2178 | extent_op = locked_ref->extent_op; |
2179 | locked_ref->extent_op = NULL; | |
2180 | ||
56bec294 CM |
2181 | /* |
2182 | * locked_ref is the head node, so we have to go one | |
2183 | * node back for any delayed ref updates | |
2184 | */ | |
56bec294 CM |
2185 | ref = select_delayed_ref(locked_ref); |
2186 | if (!ref) { | |
2187 | /* All delayed refs have been processed, Go ahead | |
2188 | * and send the head node to run_one_delayed_ref, | |
2189 | * so that any accounting fixes can happen | |
2190 | */ | |
2191 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2192 | |
2193 | if (extent_op && must_insert_reserved) { | |
2194 | kfree(extent_op); | |
2195 | extent_op = NULL; | |
2196 | } | |
2197 | ||
2198 | if (extent_op) { | |
2199 | spin_unlock(&delayed_refs->lock); | |
2200 | ||
2201 | ret = run_delayed_extent_op(trans, root, | |
2202 | ref, extent_op); | |
2203 | BUG_ON(ret); | |
2204 | kfree(extent_op); | |
2205 | ||
2206 | cond_resched(); | |
2207 | spin_lock(&delayed_refs->lock); | |
2208 | continue; | |
2209 | } | |
2210 | ||
c3e69d58 | 2211 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2212 | locked_ref = NULL; |
2213 | } | |
02217ed2 | 2214 | |
56bec294 CM |
2215 | ref->in_tree = 0; |
2216 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2217 | delayed_refs->num_entries--; | |
5d4f98a2 | 2218 | |
56bec294 | 2219 | spin_unlock(&delayed_refs->lock); |
925baedd | 2220 | |
5d4f98a2 | 2221 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2222 | must_insert_reserved); |
2223 | BUG_ON(ret); | |
eb099670 | 2224 | |
5d4f98a2 YZ |
2225 | btrfs_put_delayed_ref(ref); |
2226 | kfree(extent_op); | |
c3e69d58 | 2227 | count++; |
5d4f98a2 | 2228 | |
c3e69d58 CM |
2229 | cond_resched(); |
2230 | spin_lock(&delayed_refs->lock); | |
2231 | } | |
2232 | return count; | |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * this starts processing the delayed reference count updates and | |
2237 | * extent insertions we have queued up so far. count can be | |
2238 | * 0, which means to process everything in the tree at the start | |
2239 | * of the run (but not newly added entries), or it can be some target | |
2240 | * number you'd like to process. | |
2241 | */ | |
2242 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2243 | struct btrfs_root *root, unsigned long count) | |
2244 | { | |
2245 | struct rb_node *node; | |
2246 | struct btrfs_delayed_ref_root *delayed_refs; | |
2247 | struct btrfs_delayed_ref_node *ref; | |
2248 | struct list_head cluster; | |
2249 | int ret; | |
2250 | int run_all = count == (unsigned long)-1; | |
2251 | int run_most = 0; | |
2252 | ||
2253 | if (root == root->fs_info->extent_root) | |
2254 | root = root->fs_info->tree_root; | |
2255 | ||
2256 | delayed_refs = &trans->transaction->delayed_refs; | |
2257 | INIT_LIST_HEAD(&cluster); | |
2258 | again: | |
2259 | spin_lock(&delayed_refs->lock); | |
2260 | if (count == 0) { | |
2261 | count = delayed_refs->num_entries * 2; | |
2262 | run_most = 1; | |
2263 | } | |
2264 | while (1) { | |
2265 | if (!(run_all || run_most) && | |
2266 | delayed_refs->num_heads_ready < 64) | |
2267 | break; | |
eb099670 | 2268 | |
56bec294 | 2269 | /* |
c3e69d58 CM |
2270 | * go find something we can process in the rbtree. We start at |
2271 | * the beginning of the tree, and then build a cluster | |
2272 | * of refs to process starting at the first one we are able to | |
2273 | * lock | |
56bec294 | 2274 | */ |
c3e69d58 CM |
2275 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2276 | delayed_refs->run_delayed_start); | |
2277 | if (ret) | |
56bec294 CM |
2278 | break; |
2279 | ||
c3e69d58 CM |
2280 | ret = run_clustered_refs(trans, root, &cluster); |
2281 | BUG_ON(ret < 0); | |
2282 | ||
2283 | count -= min_t(unsigned long, ret, count); | |
2284 | ||
2285 | if (count == 0) | |
2286 | break; | |
eb099670 | 2287 | } |
c3e69d58 | 2288 | |
56bec294 | 2289 | if (run_all) { |
56bec294 | 2290 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2291 | if (!node) |
56bec294 | 2292 | goto out; |
c3e69d58 | 2293 | count = (unsigned long)-1; |
e9d0b13b | 2294 | |
56bec294 CM |
2295 | while (node) { |
2296 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2297 | rb_node); | |
2298 | if (btrfs_delayed_ref_is_head(ref)) { | |
2299 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2300 | |
56bec294 CM |
2301 | head = btrfs_delayed_node_to_head(ref); |
2302 | atomic_inc(&ref->refs); | |
2303 | ||
2304 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2305 | /* |
2306 | * Mutex was contended, block until it's | |
2307 | * released and try again | |
2308 | */ | |
56bec294 CM |
2309 | mutex_lock(&head->mutex); |
2310 | mutex_unlock(&head->mutex); | |
2311 | ||
2312 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2313 | cond_resched(); |
56bec294 CM |
2314 | goto again; |
2315 | } | |
2316 | node = rb_next(node); | |
2317 | } | |
2318 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2319 | schedule_timeout(1); |
2320 | goto again; | |
5f39d397 | 2321 | } |
54aa1f4d | 2322 | out: |
c3e69d58 | 2323 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2324 | return 0; |
2325 | } | |
2326 | ||
5d4f98a2 YZ |
2327 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2328 | struct btrfs_root *root, | |
2329 | u64 bytenr, u64 num_bytes, u64 flags, | |
2330 | int is_data) | |
2331 | { | |
2332 | struct btrfs_delayed_extent_op *extent_op; | |
2333 | int ret; | |
2334 | ||
2335 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2336 | if (!extent_op) | |
2337 | return -ENOMEM; | |
2338 | ||
2339 | extent_op->flags_to_set = flags; | |
2340 | extent_op->update_flags = 1; | |
2341 | extent_op->update_key = 0; | |
2342 | extent_op->is_data = is_data ? 1 : 0; | |
2343 | ||
2344 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2345 | if (ret) | |
2346 | kfree(extent_op); | |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2351 | struct btrfs_root *root, | |
2352 | struct btrfs_path *path, | |
2353 | u64 objectid, u64 offset, u64 bytenr) | |
2354 | { | |
2355 | struct btrfs_delayed_ref_head *head; | |
2356 | struct btrfs_delayed_ref_node *ref; | |
2357 | struct btrfs_delayed_data_ref *data_ref; | |
2358 | struct btrfs_delayed_ref_root *delayed_refs; | |
2359 | struct rb_node *node; | |
2360 | int ret = 0; | |
2361 | ||
2362 | ret = -ENOENT; | |
2363 | delayed_refs = &trans->transaction->delayed_refs; | |
2364 | spin_lock(&delayed_refs->lock); | |
2365 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2366 | if (!head) | |
2367 | goto out; | |
2368 | ||
2369 | if (!mutex_trylock(&head->mutex)) { | |
2370 | atomic_inc(&head->node.refs); | |
2371 | spin_unlock(&delayed_refs->lock); | |
2372 | ||
b3b4aa74 | 2373 | btrfs_release_path(path); |
5d4f98a2 | 2374 | |
8cc33e5c DS |
2375 | /* |
2376 | * Mutex was contended, block until it's released and let | |
2377 | * caller try again | |
2378 | */ | |
5d4f98a2 YZ |
2379 | mutex_lock(&head->mutex); |
2380 | mutex_unlock(&head->mutex); | |
2381 | btrfs_put_delayed_ref(&head->node); | |
2382 | return -EAGAIN; | |
2383 | } | |
2384 | ||
2385 | node = rb_prev(&head->node.rb_node); | |
2386 | if (!node) | |
2387 | goto out_unlock; | |
2388 | ||
2389 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2390 | ||
2391 | if (ref->bytenr != bytenr) | |
2392 | goto out_unlock; | |
2393 | ||
2394 | ret = 1; | |
2395 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2396 | goto out_unlock; | |
2397 | ||
2398 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2399 | ||
2400 | node = rb_prev(node); | |
2401 | if (node) { | |
2402 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2403 | if (ref->bytenr == bytenr) | |
2404 | goto out_unlock; | |
2405 | } | |
2406 | ||
2407 | if (data_ref->root != root->root_key.objectid || | |
2408 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2409 | goto out_unlock; | |
2410 | ||
2411 | ret = 0; | |
2412 | out_unlock: | |
2413 | mutex_unlock(&head->mutex); | |
2414 | out: | |
2415 | spin_unlock(&delayed_refs->lock); | |
2416 | return ret; | |
2417 | } | |
2418 | ||
2419 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2420 | struct btrfs_root *root, | |
2421 | struct btrfs_path *path, | |
2422 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2423 | { |
2424 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2425 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2426 | struct btrfs_extent_data_ref *ref; |
2427 | struct btrfs_extent_inline_ref *iref; | |
2428 | struct btrfs_extent_item *ei; | |
f321e491 | 2429 | struct btrfs_key key; |
5d4f98a2 | 2430 | u32 item_size; |
be20aa9d | 2431 | int ret; |
925baedd | 2432 | |
be20aa9d | 2433 | key.objectid = bytenr; |
31840ae1 | 2434 | key.offset = (u64)-1; |
f321e491 | 2435 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2436 | |
be20aa9d CM |
2437 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2438 | if (ret < 0) | |
2439 | goto out; | |
2440 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2441 | |
2442 | ret = -ENOENT; | |
2443 | if (path->slots[0] == 0) | |
31840ae1 | 2444 | goto out; |
be20aa9d | 2445 | |
31840ae1 | 2446 | path->slots[0]--; |
f321e491 | 2447 | leaf = path->nodes[0]; |
5d4f98a2 | 2448 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2449 | |
5d4f98a2 | 2450 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2451 | goto out; |
f321e491 | 2452 | |
5d4f98a2 YZ |
2453 | ret = 1; |
2454 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2455 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2456 | if (item_size < sizeof(*ei)) { | |
2457 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2458 | goto out; | |
2459 | } | |
2460 | #endif | |
2461 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2462 | |
5d4f98a2 YZ |
2463 | if (item_size != sizeof(*ei) + |
2464 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2465 | goto out; | |
be20aa9d | 2466 | |
5d4f98a2 YZ |
2467 | if (btrfs_extent_generation(leaf, ei) <= |
2468 | btrfs_root_last_snapshot(&root->root_item)) | |
2469 | goto out; | |
2470 | ||
2471 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2472 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2473 | BTRFS_EXTENT_DATA_REF_KEY) | |
2474 | goto out; | |
2475 | ||
2476 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2477 | if (btrfs_extent_refs(leaf, ei) != | |
2478 | btrfs_extent_data_ref_count(leaf, ref) || | |
2479 | btrfs_extent_data_ref_root(leaf, ref) != | |
2480 | root->root_key.objectid || | |
2481 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2482 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2483 | goto out; | |
2484 | ||
2485 | ret = 0; | |
2486 | out: | |
2487 | return ret; | |
2488 | } | |
2489 | ||
2490 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2491 | struct btrfs_root *root, | |
2492 | u64 objectid, u64 offset, u64 bytenr) | |
2493 | { | |
2494 | struct btrfs_path *path; | |
2495 | int ret; | |
2496 | int ret2; | |
2497 | ||
2498 | path = btrfs_alloc_path(); | |
2499 | if (!path) | |
2500 | return -ENOENT; | |
2501 | ||
2502 | do { | |
2503 | ret = check_committed_ref(trans, root, path, objectid, | |
2504 | offset, bytenr); | |
2505 | if (ret && ret != -ENOENT) | |
f321e491 | 2506 | goto out; |
80ff3856 | 2507 | |
5d4f98a2 YZ |
2508 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2509 | offset, bytenr); | |
2510 | } while (ret2 == -EAGAIN); | |
2511 | ||
2512 | if (ret2 && ret2 != -ENOENT) { | |
2513 | ret = ret2; | |
2514 | goto out; | |
f321e491 | 2515 | } |
5d4f98a2 YZ |
2516 | |
2517 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2518 | ret = 0; | |
be20aa9d | 2519 | out: |
80ff3856 | 2520 | btrfs_free_path(path); |
f0486c68 YZ |
2521 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2522 | WARN_ON(ret > 0); | |
f321e491 | 2523 | return ret; |
be20aa9d | 2524 | } |
c5739bba | 2525 | |
5d4f98a2 | 2526 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2527 | struct btrfs_root *root, |
5d4f98a2 YZ |
2528 | struct extent_buffer *buf, |
2529 | int full_backref, int inc) | |
31840ae1 ZY |
2530 | { |
2531 | u64 bytenr; | |
5d4f98a2 YZ |
2532 | u64 num_bytes; |
2533 | u64 parent; | |
31840ae1 | 2534 | u64 ref_root; |
31840ae1 | 2535 | u32 nritems; |
31840ae1 ZY |
2536 | struct btrfs_key key; |
2537 | struct btrfs_file_extent_item *fi; | |
2538 | int i; | |
2539 | int level; | |
2540 | int ret = 0; | |
31840ae1 | 2541 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2542 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2543 | |
2544 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2545 | nritems = btrfs_header_nritems(buf); |
2546 | level = btrfs_header_level(buf); | |
2547 | ||
5d4f98a2 YZ |
2548 | if (!root->ref_cows && level == 0) |
2549 | return 0; | |
31840ae1 | 2550 | |
5d4f98a2 YZ |
2551 | if (inc) |
2552 | process_func = btrfs_inc_extent_ref; | |
2553 | else | |
2554 | process_func = btrfs_free_extent; | |
31840ae1 | 2555 | |
5d4f98a2 YZ |
2556 | if (full_backref) |
2557 | parent = buf->start; | |
2558 | else | |
2559 | parent = 0; | |
2560 | ||
2561 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2562 | if (level == 0) { |
5d4f98a2 | 2563 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2564 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2565 | continue; | |
5d4f98a2 | 2566 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2567 | struct btrfs_file_extent_item); |
2568 | if (btrfs_file_extent_type(buf, fi) == | |
2569 | BTRFS_FILE_EXTENT_INLINE) | |
2570 | continue; | |
2571 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2572 | if (bytenr == 0) | |
2573 | continue; | |
5d4f98a2 YZ |
2574 | |
2575 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2576 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2577 | ret = process_func(trans, root, bytenr, num_bytes, | |
2578 | parent, ref_root, key.objectid, | |
2579 | key.offset); | |
31840ae1 ZY |
2580 | if (ret) |
2581 | goto fail; | |
2582 | } else { | |
5d4f98a2 YZ |
2583 | bytenr = btrfs_node_blockptr(buf, i); |
2584 | num_bytes = btrfs_level_size(root, level - 1); | |
2585 | ret = process_func(trans, root, bytenr, num_bytes, | |
2586 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2587 | if (ret) |
2588 | goto fail; | |
2589 | } | |
2590 | } | |
2591 | return 0; | |
2592 | fail: | |
5d4f98a2 YZ |
2593 | BUG(); |
2594 | return ret; | |
2595 | } | |
2596 | ||
2597 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2598 | struct extent_buffer *buf, int full_backref) | |
2599 | { | |
2600 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2601 | } | |
2602 | ||
2603 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2604 | struct extent_buffer *buf, int full_backref) | |
2605 | { | |
2606 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2607 | } |
2608 | ||
9078a3e1 CM |
2609 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2610 | struct btrfs_root *root, | |
2611 | struct btrfs_path *path, | |
2612 | struct btrfs_block_group_cache *cache) | |
2613 | { | |
2614 | int ret; | |
9078a3e1 | 2615 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2616 | unsigned long bi; |
2617 | struct extent_buffer *leaf; | |
9078a3e1 | 2618 | |
9078a3e1 | 2619 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2620 | if (ret < 0) |
2621 | goto fail; | |
9078a3e1 | 2622 | BUG_ON(ret); |
5f39d397 CM |
2623 | |
2624 | leaf = path->nodes[0]; | |
2625 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2626 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2627 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2628 | btrfs_release_path(path); |
54aa1f4d | 2629 | fail: |
9078a3e1 CM |
2630 | if (ret) |
2631 | return ret; | |
9078a3e1 CM |
2632 | return 0; |
2633 | ||
2634 | } | |
2635 | ||
4a8c9a62 YZ |
2636 | static struct btrfs_block_group_cache * |
2637 | next_block_group(struct btrfs_root *root, | |
2638 | struct btrfs_block_group_cache *cache) | |
2639 | { | |
2640 | struct rb_node *node; | |
2641 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2642 | node = rb_next(&cache->cache_node); | |
2643 | btrfs_put_block_group(cache); | |
2644 | if (node) { | |
2645 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2646 | cache_node); | |
11dfe35a | 2647 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2648 | } else |
2649 | cache = NULL; | |
2650 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2651 | return cache; | |
2652 | } | |
2653 | ||
0af3d00b JB |
2654 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2655 | struct btrfs_trans_handle *trans, | |
2656 | struct btrfs_path *path) | |
2657 | { | |
2658 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2659 | struct inode *inode = NULL; | |
2660 | u64 alloc_hint = 0; | |
2b20982e | 2661 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2662 | int num_pages = 0; |
2663 | int retries = 0; | |
2664 | int ret = 0; | |
2665 | ||
2666 | /* | |
2667 | * If this block group is smaller than 100 megs don't bother caching the | |
2668 | * block group. | |
2669 | */ | |
2670 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2671 | spin_lock(&block_group->lock); | |
2672 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2673 | spin_unlock(&block_group->lock); | |
2674 | return 0; | |
2675 | } | |
2676 | ||
2677 | again: | |
2678 | inode = lookup_free_space_inode(root, block_group, path); | |
2679 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2680 | ret = PTR_ERR(inode); | |
b3b4aa74 | 2681 | btrfs_release_path(path); |
0af3d00b JB |
2682 | goto out; |
2683 | } | |
2684 | ||
2685 | if (IS_ERR(inode)) { | |
2686 | BUG_ON(retries); | |
2687 | retries++; | |
2688 | ||
2689 | if (block_group->ro) | |
2690 | goto out_free; | |
2691 | ||
2692 | ret = create_free_space_inode(root, trans, block_group, path); | |
2693 | if (ret) | |
2694 | goto out_free; | |
2695 | goto again; | |
2696 | } | |
2697 | ||
2698 | /* | |
2699 | * We want to set the generation to 0, that way if anything goes wrong | |
2700 | * from here on out we know not to trust this cache when we load up next | |
2701 | * time. | |
2702 | */ | |
2703 | BTRFS_I(inode)->generation = 0; | |
2704 | ret = btrfs_update_inode(trans, root, inode); | |
2705 | WARN_ON(ret); | |
2706 | ||
2707 | if (i_size_read(inode) > 0) { | |
2708 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2709 | inode); | |
2710 | if (ret) | |
2711 | goto out_put; | |
2712 | } | |
2713 | ||
2714 | spin_lock(&block_group->lock); | |
2715 | if (block_group->cached != BTRFS_CACHE_FINISHED) { | |
2b20982e JB |
2716 | /* We're not cached, don't bother trying to write stuff out */ |
2717 | dcs = BTRFS_DC_WRITTEN; | |
0af3d00b JB |
2718 | spin_unlock(&block_group->lock); |
2719 | goto out_put; | |
2720 | } | |
2721 | spin_unlock(&block_group->lock); | |
2722 | ||
2723 | num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024); | |
2724 | if (!num_pages) | |
2725 | num_pages = 1; | |
2726 | ||
2727 | /* | |
2728 | * Just to make absolutely sure we have enough space, we're going to | |
2729 | * preallocate 12 pages worth of space for each block group. In | |
2730 | * practice we ought to use at most 8, but we need extra space so we can | |
2731 | * add our header and have a terminator between the extents and the | |
2732 | * bitmaps. | |
2733 | */ | |
2734 | num_pages *= 16; | |
2735 | num_pages *= PAGE_CACHE_SIZE; | |
2736 | ||
2737 | ret = btrfs_check_data_free_space(inode, num_pages); | |
2738 | if (ret) | |
2739 | goto out_put; | |
2740 | ||
2741 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
2742 | num_pages, num_pages, | |
2743 | &alloc_hint); | |
2b20982e JB |
2744 | if (!ret) |
2745 | dcs = BTRFS_DC_SETUP; | |
0af3d00b JB |
2746 | btrfs_free_reserved_data_space(inode, num_pages); |
2747 | out_put: | |
2748 | iput(inode); | |
2749 | out_free: | |
b3b4aa74 | 2750 | btrfs_release_path(path); |
0af3d00b JB |
2751 | out: |
2752 | spin_lock(&block_group->lock); | |
2b20982e | 2753 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
2754 | spin_unlock(&block_group->lock); |
2755 | ||
2756 | return ret; | |
2757 | } | |
2758 | ||
96b5179d CM |
2759 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2760 | struct btrfs_root *root) | |
9078a3e1 | 2761 | { |
4a8c9a62 | 2762 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2763 | int err = 0; |
9078a3e1 | 2764 | struct btrfs_path *path; |
96b5179d | 2765 | u64 last = 0; |
9078a3e1 CM |
2766 | |
2767 | path = btrfs_alloc_path(); | |
2768 | if (!path) | |
2769 | return -ENOMEM; | |
2770 | ||
0af3d00b JB |
2771 | again: |
2772 | while (1) { | |
2773 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2774 | while (cache) { | |
2775 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
2776 | break; | |
2777 | cache = next_block_group(root, cache); | |
2778 | } | |
2779 | if (!cache) { | |
2780 | if (last == 0) | |
2781 | break; | |
2782 | last = 0; | |
2783 | continue; | |
2784 | } | |
2785 | err = cache_save_setup(cache, trans, path); | |
2786 | last = cache->key.objectid + cache->key.offset; | |
2787 | btrfs_put_block_group(cache); | |
2788 | } | |
2789 | ||
d397712b | 2790 | while (1) { |
4a8c9a62 YZ |
2791 | if (last == 0) { |
2792 | err = btrfs_run_delayed_refs(trans, root, | |
2793 | (unsigned long)-1); | |
2794 | BUG_ON(err); | |
0f9dd46c | 2795 | } |
54aa1f4d | 2796 | |
4a8c9a62 YZ |
2797 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2798 | while (cache) { | |
0af3d00b JB |
2799 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
2800 | btrfs_put_block_group(cache); | |
2801 | goto again; | |
2802 | } | |
2803 | ||
4a8c9a62 YZ |
2804 | if (cache->dirty) |
2805 | break; | |
2806 | cache = next_block_group(root, cache); | |
2807 | } | |
2808 | if (!cache) { | |
2809 | if (last == 0) | |
2810 | break; | |
2811 | last = 0; | |
2812 | continue; | |
2813 | } | |
0f9dd46c | 2814 | |
0cb59c99 JB |
2815 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
2816 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 2817 | cache->dirty = 0; |
4a8c9a62 | 2818 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2819 | |
4a8c9a62 YZ |
2820 | err = write_one_cache_group(trans, root, path, cache); |
2821 | BUG_ON(err); | |
2822 | btrfs_put_block_group(cache); | |
9078a3e1 | 2823 | } |
4a8c9a62 | 2824 | |
0cb59c99 JB |
2825 | while (1) { |
2826 | /* | |
2827 | * I don't think this is needed since we're just marking our | |
2828 | * preallocated extent as written, but just in case it can't | |
2829 | * hurt. | |
2830 | */ | |
2831 | if (last == 0) { | |
2832 | err = btrfs_run_delayed_refs(trans, root, | |
2833 | (unsigned long)-1); | |
2834 | BUG_ON(err); | |
2835 | } | |
2836 | ||
2837 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2838 | while (cache) { | |
2839 | /* | |
2840 | * Really this shouldn't happen, but it could if we | |
2841 | * couldn't write the entire preallocated extent and | |
2842 | * splitting the extent resulted in a new block. | |
2843 | */ | |
2844 | if (cache->dirty) { | |
2845 | btrfs_put_block_group(cache); | |
2846 | goto again; | |
2847 | } | |
2848 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2849 | break; | |
2850 | cache = next_block_group(root, cache); | |
2851 | } | |
2852 | if (!cache) { | |
2853 | if (last == 0) | |
2854 | break; | |
2855 | last = 0; | |
2856 | continue; | |
2857 | } | |
2858 | ||
2859 | btrfs_write_out_cache(root, trans, cache, path); | |
2860 | ||
2861 | /* | |
2862 | * If we didn't have an error then the cache state is still | |
2863 | * NEED_WRITE, so we can set it to WRITTEN. | |
2864 | */ | |
2865 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2866 | cache->disk_cache_state = BTRFS_DC_WRITTEN; | |
2867 | last = cache->key.objectid + cache->key.offset; | |
2868 | btrfs_put_block_group(cache); | |
2869 | } | |
2870 | ||
9078a3e1 | 2871 | btrfs_free_path(path); |
4a8c9a62 | 2872 | return 0; |
9078a3e1 CM |
2873 | } |
2874 | ||
d2fb3437 YZ |
2875 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2876 | { | |
2877 | struct btrfs_block_group_cache *block_group; | |
2878 | int readonly = 0; | |
2879 | ||
2880 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2881 | if (!block_group || block_group->ro) | |
2882 | readonly = 1; | |
2883 | if (block_group) | |
fa9c0d79 | 2884 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2885 | return readonly; |
2886 | } | |
2887 | ||
593060d7 CM |
2888 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2889 | u64 total_bytes, u64 bytes_used, | |
2890 | struct btrfs_space_info **space_info) | |
2891 | { | |
2892 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2893 | int i; |
2894 | int factor; | |
2895 | ||
2896 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2897 | BTRFS_BLOCK_GROUP_RAID10)) | |
2898 | factor = 2; | |
2899 | else | |
2900 | factor = 1; | |
593060d7 CM |
2901 | |
2902 | found = __find_space_info(info, flags); | |
2903 | if (found) { | |
25179201 | 2904 | spin_lock(&found->lock); |
593060d7 | 2905 | found->total_bytes += total_bytes; |
89a55897 | 2906 | found->disk_total += total_bytes * factor; |
593060d7 | 2907 | found->bytes_used += bytes_used; |
b742bb82 | 2908 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2909 | found->full = 0; |
25179201 | 2910 | spin_unlock(&found->lock); |
593060d7 CM |
2911 | *space_info = found; |
2912 | return 0; | |
2913 | } | |
c146afad | 2914 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2915 | if (!found) |
2916 | return -ENOMEM; | |
2917 | ||
b742bb82 YZ |
2918 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
2919 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 2920 | init_rwsem(&found->groups_sem); |
0f9dd46c | 2921 | spin_lock_init(&found->lock); |
b742bb82 YZ |
2922 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
2923 | BTRFS_BLOCK_GROUP_SYSTEM | | |
2924 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 | 2925 | found->total_bytes = total_bytes; |
89a55897 | 2926 | found->disk_total = total_bytes * factor; |
593060d7 | 2927 | found->bytes_used = bytes_used; |
b742bb82 | 2928 | found->disk_used = bytes_used * factor; |
593060d7 | 2929 | found->bytes_pinned = 0; |
e8569813 | 2930 | found->bytes_reserved = 0; |
c146afad | 2931 | found->bytes_readonly = 0; |
f0486c68 | 2932 | found->bytes_may_use = 0; |
593060d7 | 2933 | found->full = 0; |
0e4f8f88 | 2934 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 2935 | found->chunk_alloc = 0; |
593060d7 | 2936 | *space_info = found; |
4184ea7f | 2937 | list_add_rcu(&found->list, &info->space_info); |
817d52f8 | 2938 | atomic_set(&found->caching_threads, 0); |
593060d7 CM |
2939 | return 0; |
2940 | } | |
2941 | ||
8790d502 CM |
2942 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
2943 | { | |
2944 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 2945 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 2946 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 2947 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
2948 | if (extra_flags) { |
2949 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
2950 | fs_info->avail_data_alloc_bits |= extra_flags; | |
2951 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
2952 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
2953 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2954 | fs_info->avail_system_alloc_bits |= extra_flags; | |
2955 | } | |
2956 | } | |
593060d7 | 2957 | |
2b82032c | 2958 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 2959 | { |
cd02dca5 CM |
2960 | /* |
2961 | * we add in the count of missing devices because we want | |
2962 | * to make sure that any RAID levels on a degraded FS | |
2963 | * continue to be honored. | |
2964 | */ | |
2965 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
2966 | root->fs_info->fs_devices->missing_devices; | |
a061fc8d CM |
2967 | |
2968 | if (num_devices == 1) | |
2969 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
2970 | if (num_devices < 4) | |
2971 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
2972 | ||
ec44a35c CM |
2973 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
2974 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 2975 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 2976 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 2977 | } |
ec44a35c CM |
2978 | |
2979 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 2980 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 2981 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 2982 | } |
ec44a35c CM |
2983 | |
2984 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
2985 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
2986 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
2987 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
2988 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
2989 | return flags; | |
2990 | } | |
2991 | ||
b742bb82 | 2992 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 2993 | { |
b742bb82 YZ |
2994 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
2995 | flags |= root->fs_info->avail_data_alloc_bits & | |
2996 | root->fs_info->data_alloc_profile; | |
2997 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2998 | flags |= root->fs_info->avail_system_alloc_bits & | |
2999 | root->fs_info->system_alloc_profile; | |
3000 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3001 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
3002 | root->fs_info->metadata_alloc_profile; | |
3003 | return btrfs_reduce_alloc_profile(root, flags); | |
6a63209f JB |
3004 | } |
3005 | ||
6d07bcec | 3006 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3007 | { |
b742bb82 | 3008 | u64 flags; |
9ed74f2d | 3009 | |
b742bb82 YZ |
3010 | if (data) |
3011 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3012 | else if (root == root->fs_info->chunk_root) | |
3013 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3014 | else |
b742bb82 | 3015 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3016 | |
b742bb82 | 3017 | return get_alloc_profile(root, flags); |
6a63209f | 3018 | } |
9ed74f2d | 3019 | |
6a63209f JB |
3020 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
3021 | { | |
6a63209f | 3022 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 3023 | BTRFS_BLOCK_GROUP_DATA); |
9ed74f2d JB |
3024 | } |
3025 | ||
6a63209f | 3026 | /* |
6a63209f JB |
3027 | * This will check the space that the inode allocates from to make sure we have |
3028 | * enough space for bytes. | |
6a63209f | 3029 | */ |
0ca1f7ce | 3030 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3031 | { |
6a63209f | 3032 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3033 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 3034 | u64 used; |
0af3d00b | 3035 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3036 | |
6a63209f JB |
3037 | /* make sure bytes are sectorsize aligned */ |
3038 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3039 | |
82d5902d LZ |
3040 | if (root == root->fs_info->tree_root || |
3041 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3042 | alloc_chunk = 0; |
3043 | committed = 1; | |
3044 | } | |
3045 | ||
6a63209f | 3046 | data_sinfo = BTRFS_I(inode)->space_info; |
33b4d47f CM |
3047 | if (!data_sinfo) |
3048 | goto alloc; | |
9ed74f2d | 3049 | |
6a63209f JB |
3050 | again: |
3051 | /* make sure we have enough space to handle the data first */ | |
3052 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3053 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3054 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3055 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3056 | |
3057 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3058 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3059 | |
6a63209f JB |
3060 | /* |
3061 | * if we don't have enough free bytes in this space then we need | |
3062 | * to alloc a new chunk. | |
3063 | */ | |
0af3d00b | 3064 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3065 | u64 alloc_target; |
9ed74f2d | 3066 | |
0e4f8f88 | 3067 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3068 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3069 | alloc: |
6a63209f | 3070 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3071 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3072 | if (IS_ERR(trans)) |
3073 | return PTR_ERR(trans); | |
9ed74f2d | 3074 | |
6a63209f JB |
3075 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
3076 | bytes + 2 * 1024 * 1024, | |
0e4f8f88 CM |
3077 | alloc_target, |
3078 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3079 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3080 | if (ret < 0) { |
3081 | if (ret != -ENOSPC) | |
3082 | return ret; | |
3083 | else | |
3084 | goto commit_trans; | |
3085 | } | |
9ed74f2d | 3086 | |
33b4d47f CM |
3087 | if (!data_sinfo) { |
3088 | btrfs_set_inode_space_info(root, inode); | |
3089 | data_sinfo = BTRFS_I(inode)->space_info; | |
3090 | } | |
6a63209f JB |
3091 | goto again; |
3092 | } | |
3093 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3094 | |
4e06bdd6 | 3095 | /* commit the current transaction and try again */ |
d52a5b5f | 3096 | commit_trans: |
a4abeea4 JB |
3097 | if (!committed && |
3098 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3099 | committed = 1; |
7a7eaa40 | 3100 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3101 | if (IS_ERR(trans)) |
3102 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3103 | ret = btrfs_commit_transaction(trans, root); |
3104 | if (ret) | |
3105 | return ret; | |
3106 | goto again; | |
3107 | } | |
9ed74f2d | 3108 | |
6a63209f JB |
3109 | return -ENOSPC; |
3110 | } | |
3111 | data_sinfo->bytes_may_use += bytes; | |
3112 | BTRFS_I(inode)->reserved_bytes += bytes; | |
3113 | spin_unlock(&data_sinfo->lock); | |
6a63209f | 3114 | |
9ed74f2d | 3115 | return 0; |
9ed74f2d | 3116 | } |
6a63209f | 3117 | |
6a63209f | 3118 | /* |
0ca1f7ce YZ |
3119 | * called when we are clearing an delalloc extent from the |
3120 | * inode's io_tree or there was an error for whatever reason | |
3121 | * after calling btrfs_check_data_free_space | |
6a63209f | 3122 | */ |
0ca1f7ce | 3123 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3124 | { |
0ca1f7ce | 3125 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3126 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3127 | |
6a63209f JB |
3128 | /* make sure bytes are sectorsize aligned */ |
3129 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3130 | |
6a63209f JB |
3131 | data_sinfo = BTRFS_I(inode)->space_info; |
3132 | spin_lock(&data_sinfo->lock); | |
3133 | data_sinfo->bytes_may_use -= bytes; | |
3134 | BTRFS_I(inode)->reserved_bytes -= bytes; | |
3135 | spin_unlock(&data_sinfo->lock); | |
e3ccfa98 JB |
3136 | } |
3137 | ||
97e728d4 | 3138 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3139 | { |
97e728d4 JB |
3140 | struct list_head *head = &info->space_info; |
3141 | struct btrfs_space_info *found; | |
e3ccfa98 | 3142 | |
97e728d4 JB |
3143 | rcu_read_lock(); |
3144 | list_for_each_entry_rcu(found, head, list) { | |
3145 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3146 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3147 | } |
97e728d4 | 3148 | rcu_read_unlock(); |
e3ccfa98 JB |
3149 | } |
3150 | ||
e5bc2458 | 3151 | static int should_alloc_chunk(struct btrfs_root *root, |
0e4f8f88 CM |
3152 | struct btrfs_space_info *sinfo, u64 alloc_bytes, |
3153 | int force) | |
32c00aff | 3154 | { |
424499db | 3155 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3156 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3157 | u64 thresh; |
e3ccfa98 | 3158 | |
0e4f8f88 CM |
3159 | if (force == CHUNK_ALLOC_FORCE) |
3160 | return 1; | |
3161 | ||
3162 | /* | |
3163 | * in limited mode, we want to have some free space up to | |
3164 | * about 1% of the FS size. | |
3165 | */ | |
3166 | if (force == CHUNK_ALLOC_LIMITED) { | |
3167 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
3168 | thresh = max_t(u64, 64 * 1024 * 1024, | |
3169 | div_factor_fine(thresh, 1)); | |
3170 | ||
3171 | if (num_bytes - num_allocated < thresh) | |
3172 | return 1; | |
3173 | } | |
3174 | ||
3175 | /* | |
3176 | * we have two similar checks here, one based on percentage | |
3177 | * and once based on a hard number of 256MB. The idea | |
3178 | * is that if we have a good amount of free | |
3179 | * room, don't allocate a chunk. A good mount is | |
3180 | * less than 80% utilized of the chunks we have allocated, | |
3181 | * or more than 256MB free | |
3182 | */ | |
3183 | if (num_allocated + alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
424499db | 3184 | return 0; |
e3ccfa98 | 3185 | |
0e4f8f88 | 3186 | if (num_allocated + alloc_bytes < div_factor(num_bytes, 8)) |
424499db | 3187 | return 0; |
32c00aff | 3188 | |
e5bc2458 | 3189 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); |
0e4f8f88 CM |
3190 | |
3191 | /* 256MB or 5% of the FS */ | |
e5bc2458 CM |
3192 | thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5)); |
3193 | ||
3194 | if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3)) | |
14ed0ca6 | 3195 | return 0; |
424499db | 3196 | return 1; |
32c00aff JB |
3197 | } |
3198 | ||
6324fbf3 CM |
3199 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3200 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3201 | u64 flags, int force) |
9ed74f2d | 3202 | { |
6324fbf3 | 3203 | struct btrfs_space_info *space_info; |
97e728d4 | 3204 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3205 | int wait_for_alloc = 0; |
9ed74f2d | 3206 | int ret = 0; |
9ed74f2d | 3207 | |
2b82032c | 3208 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3209 | |
6324fbf3 | 3210 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3211 | if (!space_info) { |
3212 | ret = update_space_info(extent_root->fs_info, flags, | |
3213 | 0, 0, &space_info); | |
3214 | BUG_ON(ret); | |
9ed74f2d | 3215 | } |
6324fbf3 | 3216 | BUG_ON(!space_info); |
9ed74f2d | 3217 | |
6d74119f | 3218 | again: |
25179201 | 3219 | spin_lock(&space_info->lock); |
9ed74f2d | 3220 | if (space_info->force_alloc) |
0e4f8f88 | 3221 | force = space_info->force_alloc; |
25179201 JB |
3222 | if (space_info->full) { |
3223 | spin_unlock(&space_info->lock); | |
6d74119f | 3224 | return 0; |
9ed74f2d JB |
3225 | } |
3226 | ||
0e4f8f88 | 3227 | if (!should_alloc_chunk(extent_root, space_info, alloc_bytes, force)) { |
25179201 | 3228 | spin_unlock(&space_info->lock); |
6d74119f JB |
3229 | return 0; |
3230 | } else if (space_info->chunk_alloc) { | |
3231 | wait_for_alloc = 1; | |
3232 | } else { | |
3233 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3234 | } |
0e4f8f88 | 3235 | |
25179201 | 3236 | spin_unlock(&space_info->lock); |
9ed74f2d | 3237 | |
6d74119f JB |
3238 | mutex_lock(&fs_info->chunk_mutex); |
3239 | ||
3240 | /* | |
3241 | * The chunk_mutex is held throughout the entirety of a chunk | |
3242 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3243 | * other guy is done and we need to recheck and see if we should | |
3244 | * allocate. | |
3245 | */ | |
3246 | if (wait_for_alloc) { | |
3247 | mutex_unlock(&fs_info->chunk_mutex); | |
3248 | wait_for_alloc = 0; | |
3249 | goto again; | |
3250 | } | |
3251 | ||
67377734 JB |
3252 | /* |
3253 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3254 | * allocating mixed chunks instead of individual chunks. | |
3255 | */ | |
3256 | if (btrfs_mixed_space_info(space_info)) | |
3257 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3258 | ||
97e728d4 JB |
3259 | /* |
3260 | * if we're doing a data chunk, go ahead and make sure that | |
3261 | * we keep a reasonable number of metadata chunks allocated in the | |
3262 | * FS as well. | |
3263 | */ | |
9ed74f2d | 3264 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3265 | fs_info->data_chunk_allocations++; |
3266 | if (!(fs_info->data_chunk_allocations % | |
3267 | fs_info->metadata_ratio)) | |
3268 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3269 | } |
3270 | ||
2b82032c | 3271 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
9ed74f2d | 3272 | spin_lock(&space_info->lock); |
9ed74f2d | 3273 | if (ret) |
6324fbf3 | 3274 | space_info->full = 1; |
424499db YZ |
3275 | else |
3276 | ret = 1; | |
6d74119f | 3277 | |
0e4f8f88 | 3278 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3279 | space_info->chunk_alloc = 0; |
9ed74f2d | 3280 | spin_unlock(&space_info->lock); |
c146afad | 3281 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3282 | return ret; |
6324fbf3 | 3283 | } |
9ed74f2d | 3284 | |
9ed74f2d | 3285 | /* |
5da9d01b | 3286 | * shrink metadata reservation for delalloc |
9ed74f2d | 3287 | */ |
5da9d01b | 3288 | static int shrink_delalloc(struct btrfs_trans_handle *trans, |
0019f10d | 3289 | struct btrfs_root *root, u64 to_reclaim, int sync) |
5da9d01b | 3290 | { |
0ca1f7ce | 3291 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3292 | struct btrfs_space_info *space_info; |
5da9d01b YZ |
3293 | u64 reserved; |
3294 | u64 max_reclaim; | |
3295 | u64 reclaimed = 0; | |
b1953bce | 3296 | long time_left; |
bf9022e0 | 3297 | int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3298 | int loops = 0; |
36e39c40 | 3299 | unsigned long progress; |
5da9d01b | 3300 | |
0ca1f7ce | 3301 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3302 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3303 | |
3304 | smp_mb(); | |
0019f10d | 3305 | reserved = space_info->bytes_reserved; |
36e39c40 | 3306 | progress = space_info->reservation_progress; |
5da9d01b YZ |
3307 | |
3308 | if (reserved == 0) | |
3309 | return 0; | |
3310 | ||
c4f675cd ST |
3311 | /* nothing to shrink - nothing to reclaim */ |
3312 | if (root->fs_info->delalloc_bytes == 0) | |
3313 | return 0; | |
3314 | ||
5da9d01b YZ |
3315 | max_reclaim = min(reserved, to_reclaim); |
3316 | ||
b1953bce | 3317 | while (loops < 1024) { |
bf9022e0 CM |
3318 | /* have the flusher threads jump in and do some IO */ |
3319 | smp_mb(); | |
3320 | nr_pages = min_t(unsigned long, nr_pages, | |
3321 | root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT); | |
3322 | writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); | |
5da9d01b | 3323 | |
0019f10d | 3324 | spin_lock(&space_info->lock); |
36e39c40 | 3325 | if (reserved > space_info->bytes_reserved) |
0019f10d JB |
3326 | reclaimed += reserved - space_info->bytes_reserved; |
3327 | reserved = space_info->bytes_reserved; | |
3328 | spin_unlock(&space_info->lock); | |
5da9d01b | 3329 | |
36e39c40 CM |
3330 | loops++; |
3331 | ||
5da9d01b YZ |
3332 | if (reserved == 0 || reclaimed >= max_reclaim) |
3333 | break; | |
3334 | ||
3335 | if (trans && trans->transaction->blocked) | |
3336 | return -EAGAIN; | |
bf9022e0 | 3337 | |
36e39c40 | 3338 | time_left = schedule_timeout_interruptible(1); |
b1953bce JB |
3339 | |
3340 | /* We were interrupted, exit */ | |
3341 | if (time_left) | |
3342 | break; | |
3343 | ||
36e39c40 CM |
3344 | /* we've kicked the IO a few times, if anything has been freed, |
3345 | * exit. There is no sense in looping here for a long time | |
3346 | * when we really need to commit the transaction, or there are | |
3347 | * just too many writers without enough free space | |
3348 | */ | |
3349 | ||
3350 | if (loops > 3) { | |
3351 | smp_mb(); | |
3352 | if (progress != space_info->reservation_progress) | |
3353 | break; | |
3354 | } | |
bf9022e0 | 3355 | |
5da9d01b YZ |
3356 | } |
3357 | return reclaimed >= to_reclaim; | |
3358 | } | |
3359 | ||
8bb8ab2e JB |
3360 | /* |
3361 | * Retries tells us how many times we've called reserve_metadata_bytes. The | |
3362 | * idea is if this is the first call (retries == 0) then we will add to our | |
3363 | * reserved count if we can't make the allocation in order to hold our place | |
3364 | * while we go and try and free up space. That way for retries > 1 we don't try | |
3365 | * and add space, we just check to see if the amount of unused space is >= the | |
3366 | * total space, meaning that our reservation is valid. | |
3367 | * | |
3368 | * However if we don't intend to retry this reservation, pass -1 as retries so | |
3369 | * that it short circuits this logic. | |
3370 | */ | |
3371 | static int reserve_metadata_bytes(struct btrfs_trans_handle *trans, | |
3372 | struct btrfs_root *root, | |
3373 | struct btrfs_block_rsv *block_rsv, | |
3374 | u64 orig_bytes, int flush) | |
9ed74f2d | 3375 | { |
f0486c68 | 3376 | struct btrfs_space_info *space_info = block_rsv->space_info; |
8bb8ab2e JB |
3377 | u64 unused; |
3378 | u64 num_bytes = orig_bytes; | |
3379 | int retries = 0; | |
3380 | int ret = 0; | |
3381 | bool reserved = false; | |
38227933 | 3382 | bool committed = false; |
9ed74f2d | 3383 | |
8bb8ab2e JB |
3384 | again: |
3385 | ret = -ENOSPC; | |
3386 | if (reserved) | |
3387 | num_bytes = 0; | |
9ed74f2d | 3388 | |
8bb8ab2e JB |
3389 | spin_lock(&space_info->lock); |
3390 | unused = space_info->bytes_used + space_info->bytes_reserved + | |
3391 | space_info->bytes_pinned + space_info->bytes_readonly + | |
3392 | space_info->bytes_may_use; | |
9ed74f2d | 3393 | |
8bb8ab2e JB |
3394 | /* |
3395 | * The idea here is that we've not already over-reserved the block group | |
3396 | * then we can go ahead and save our reservation first and then start | |
3397 | * flushing if we need to. Otherwise if we've already overcommitted | |
3398 | * lets start flushing stuff first and then come back and try to make | |
3399 | * our reservation. | |
3400 | */ | |
3401 | if (unused <= space_info->total_bytes) { | |
6f334348 | 3402 | unused = space_info->total_bytes - unused; |
8bb8ab2e JB |
3403 | if (unused >= num_bytes) { |
3404 | if (!reserved) | |
3405 | space_info->bytes_reserved += orig_bytes; | |
3406 | ret = 0; | |
3407 | } else { | |
3408 | /* | |
3409 | * Ok set num_bytes to orig_bytes since we aren't | |
3410 | * overocmmitted, this way we only try and reclaim what | |
3411 | * we need. | |
3412 | */ | |
3413 | num_bytes = orig_bytes; | |
3414 | } | |
3415 | } else { | |
3416 | /* | |
3417 | * Ok we're over committed, set num_bytes to the overcommitted | |
3418 | * amount plus the amount of bytes that we need for this | |
3419 | * reservation. | |
3420 | */ | |
3421 | num_bytes = unused - space_info->total_bytes + | |
3422 | (orig_bytes * (retries + 1)); | |
3423 | } | |
9ed74f2d | 3424 | |
8bb8ab2e JB |
3425 | /* |
3426 | * Couldn't make our reservation, save our place so while we're trying | |
3427 | * to reclaim space we can actually use it instead of somebody else | |
3428 | * stealing it from us. | |
3429 | */ | |
3430 | if (ret && !reserved) { | |
3431 | space_info->bytes_reserved += orig_bytes; | |
3432 | reserved = true; | |
3433 | } | |
9ed74f2d | 3434 | |
f0486c68 | 3435 | spin_unlock(&space_info->lock); |
9ed74f2d | 3436 | |
8bb8ab2e JB |
3437 | if (!ret) |
3438 | return 0; | |
9ed74f2d | 3439 | |
8bb8ab2e JB |
3440 | if (!flush) |
3441 | goto out; | |
f0486c68 | 3442 | |
8bb8ab2e JB |
3443 | /* |
3444 | * We do synchronous shrinking since we don't actually unreserve | |
3445 | * metadata until after the IO is completed. | |
3446 | */ | |
3447 | ret = shrink_delalloc(trans, root, num_bytes, 1); | |
3448 | if (ret > 0) | |
3449 | return 0; | |
3450 | else if (ret < 0) | |
3451 | goto out; | |
f0486c68 | 3452 | |
8bb8ab2e JB |
3453 | /* |
3454 | * So if we were overcommitted it's possible that somebody else flushed | |
3455 | * out enough space and we simply didn't have enough space to reclaim, | |
3456 | * so go back around and try again. | |
3457 | */ | |
3458 | if (retries < 2) { | |
3459 | retries++; | |
3460 | goto again; | |
3461 | } | |
f0486c68 YZ |
3462 | |
3463 | spin_lock(&space_info->lock); | |
8bb8ab2e JB |
3464 | /* |
3465 | * Not enough space to be reclaimed, don't bother committing the | |
3466 | * transaction. | |
3467 | */ | |
3468 | if (space_info->bytes_pinned < orig_bytes) | |
3469 | ret = -ENOSPC; | |
3470 | spin_unlock(&space_info->lock); | |
3471 | if (ret) | |
3472 | goto out; | |
f0486c68 | 3473 | |
8bb8ab2e | 3474 | ret = -EAGAIN; |
38227933 | 3475 | if (trans || committed) |
8bb8ab2e | 3476 | goto out; |
f0486c68 | 3477 | |
8bb8ab2e | 3478 | ret = -ENOSPC; |
7a7eaa40 | 3479 | trans = btrfs_join_transaction(root); |
8bb8ab2e JB |
3480 | if (IS_ERR(trans)) |
3481 | goto out; | |
3482 | ret = btrfs_commit_transaction(trans, root); | |
38227933 JB |
3483 | if (!ret) { |
3484 | trans = NULL; | |
3485 | committed = true; | |
8bb8ab2e | 3486 | goto again; |
38227933 | 3487 | } |
8bb8ab2e JB |
3488 | |
3489 | out: | |
3490 | if (reserved) { | |
3491 | spin_lock(&space_info->lock); | |
3492 | space_info->bytes_reserved -= orig_bytes; | |
3493 | spin_unlock(&space_info->lock); | |
f0486c68 | 3494 | } |
4e06bdd6 | 3495 | |
f0486c68 YZ |
3496 | return ret; |
3497 | } | |
3498 | ||
3499 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3500 | struct btrfs_root *root) | |
3501 | { | |
3502 | struct btrfs_block_rsv *block_rsv; | |
3503 | if (root->ref_cows) | |
3504 | block_rsv = trans->block_rsv; | |
3505 | else | |
3506 | block_rsv = root->block_rsv; | |
3507 | ||
3508 | if (!block_rsv) | |
3509 | block_rsv = &root->fs_info->empty_block_rsv; | |
3510 | ||
3511 | return block_rsv; | |
3512 | } | |
3513 | ||
3514 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3515 | u64 num_bytes) | |
3516 | { | |
3517 | int ret = -ENOSPC; | |
3518 | spin_lock(&block_rsv->lock); | |
3519 | if (block_rsv->reserved >= num_bytes) { | |
3520 | block_rsv->reserved -= num_bytes; | |
3521 | if (block_rsv->reserved < block_rsv->size) | |
3522 | block_rsv->full = 0; | |
3523 | ret = 0; | |
3524 | } | |
3525 | spin_unlock(&block_rsv->lock); | |
3526 | return ret; | |
3527 | } | |
3528 | ||
3529 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3530 | u64 num_bytes, int update_size) | |
3531 | { | |
3532 | spin_lock(&block_rsv->lock); | |
3533 | block_rsv->reserved += num_bytes; | |
3534 | if (update_size) | |
3535 | block_rsv->size += num_bytes; | |
3536 | else if (block_rsv->reserved >= block_rsv->size) | |
3537 | block_rsv->full = 1; | |
3538 | spin_unlock(&block_rsv->lock); | |
3539 | } | |
3540 | ||
62a45b60 DS |
3541 | static void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, |
3542 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
f0486c68 YZ |
3543 | { |
3544 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3545 | ||
3546 | spin_lock(&block_rsv->lock); | |
3547 | if (num_bytes == (u64)-1) | |
3548 | num_bytes = block_rsv->size; | |
3549 | block_rsv->size -= num_bytes; | |
3550 | if (block_rsv->reserved >= block_rsv->size) { | |
3551 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3552 | block_rsv->reserved = block_rsv->size; | |
3553 | block_rsv->full = 1; | |
3554 | } else { | |
3555 | num_bytes = 0; | |
3556 | } | |
3557 | spin_unlock(&block_rsv->lock); | |
3558 | ||
3559 | if (num_bytes > 0) { | |
3560 | if (dest) { | |
e9e22899 JB |
3561 | spin_lock(&dest->lock); |
3562 | if (!dest->full) { | |
3563 | u64 bytes_to_add; | |
3564 | ||
3565 | bytes_to_add = dest->size - dest->reserved; | |
3566 | bytes_to_add = min(num_bytes, bytes_to_add); | |
3567 | dest->reserved += bytes_to_add; | |
3568 | if (dest->reserved >= dest->size) | |
3569 | dest->full = 1; | |
3570 | num_bytes -= bytes_to_add; | |
3571 | } | |
3572 | spin_unlock(&dest->lock); | |
3573 | } | |
3574 | if (num_bytes) { | |
f0486c68 YZ |
3575 | spin_lock(&space_info->lock); |
3576 | space_info->bytes_reserved -= num_bytes; | |
36e39c40 | 3577 | space_info->reservation_progress++; |
f0486c68 | 3578 | spin_unlock(&space_info->lock); |
4e06bdd6 | 3579 | } |
9ed74f2d | 3580 | } |
f0486c68 | 3581 | } |
4e06bdd6 | 3582 | |
f0486c68 YZ |
3583 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
3584 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3585 | { | |
3586 | int ret; | |
9ed74f2d | 3587 | |
f0486c68 YZ |
3588 | ret = block_rsv_use_bytes(src, num_bytes); |
3589 | if (ret) | |
3590 | return ret; | |
9ed74f2d | 3591 | |
f0486c68 | 3592 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
3593 | return 0; |
3594 | } | |
3595 | ||
f0486c68 | 3596 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) |
9ed74f2d | 3597 | { |
f0486c68 YZ |
3598 | memset(rsv, 0, sizeof(*rsv)); |
3599 | spin_lock_init(&rsv->lock); | |
3600 | atomic_set(&rsv->usage, 1); | |
3601 | rsv->priority = 6; | |
3602 | INIT_LIST_HEAD(&rsv->list); | |
3603 | } | |
3604 | ||
3605 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3606 | { | |
3607 | struct btrfs_block_rsv *block_rsv; | |
3608 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 3609 | |
f0486c68 YZ |
3610 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
3611 | if (!block_rsv) | |
3612 | return NULL; | |
9ed74f2d | 3613 | |
f0486c68 | 3614 | btrfs_init_block_rsv(block_rsv); |
f0486c68 YZ |
3615 | block_rsv->space_info = __find_space_info(fs_info, |
3616 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
3617 | return block_rsv; |
3618 | } | |
9ed74f2d | 3619 | |
f0486c68 YZ |
3620 | void btrfs_free_block_rsv(struct btrfs_root *root, |
3621 | struct btrfs_block_rsv *rsv) | |
3622 | { | |
3623 | if (rsv && atomic_dec_and_test(&rsv->usage)) { | |
3624 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
3625 | if (!rsv->durable) | |
3626 | kfree(rsv); | |
3627 | } | |
9ed74f2d JB |
3628 | } |
3629 | ||
3630 | /* | |
f0486c68 YZ |
3631 | * make the block_rsv struct be able to capture freed space. |
3632 | * the captured space will re-add to the the block_rsv struct | |
3633 | * after transaction commit | |
9ed74f2d | 3634 | */ |
f0486c68 YZ |
3635 | void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, |
3636 | struct btrfs_block_rsv *block_rsv) | |
9ed74f2d | 3637 | { |
f0486c68 YZ |
3638 | block_rsv->durable = 1; |
3639 | mutex_lock(&fs_info->durable_block_rsv_mutex); | |
3640 | list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list); | |
3641 | mutex_unlock(&fs_info->durable_block_rsv_mutex); | |
3642 | } | |
9ed74f2d | 3643 | |
f0486c68 YZ |
3644 | int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, |
3645 | struct btrfs_root *root, | |
3646 | struct btrfs_block_rsv *block_rsv, | |
8bb8ab2e | 3647 | u64 num_bytes) |
f0486c68 YZ |
3648 | { |
3649 | int ret; | |
9ed74f2d | 3650 | |
f0486c68 YZ |
3651 | if (num_bytes == 0) |
3652 | return 0; | |
8bb8ab2e JB |
3653 | |
3654 | ret = reserve_metadata_bytes(trans, root, block_rsv, num_bytes, 1); | |
f0486c68 YZ |
3655 | if (!ret) { |
3656 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3657 | return 0; | |
3658 | } | |
9ed74f2d | 3659 | |
f0486c68 YZ |
3660 | return ret; |
3661 | } | |
9ed74f2d | 3662 | |
f0486c68 YZ |
3663 | int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, |
3664 | struct btrfs_root *root, | |
3665 | struct btrfs_block_rsv *block_rsv, | |
3666 | u64 min_reserved, int min_factor) | |
3667 | { | |
3668 | u64 num_bytes = 0; | |
3669 | int commit_trans = 0; | |
3670 | int ret = -ENOSPC; | |
9ed74f2d | 3671 | |
f0486c68 YZ |
3672 | if (!block_rsv) |
3673 | return 0; | |
9ed74f2d | 3674 | |
f0486c68 YZ |
3675 | spin_lock(&block_rsv->lock); |
3676 | if (min_factor > 0) | |
3677 | num_bytes = div_factor(block_rsv->size, min_factor); | |
3678 | if (min_reserved > num_bytes) | |
3679 | num_bytes = min_reserved; | |
9ed74f2d | 3680 | |
f0486c68 YZ |
3681 | if (block_rsv->reserved >= num_bytes) { |
3682 | ret = 0; | |
3683 | } else { | |
3684 | num_bytes -= block_rsv->reserved; | |
3685 | if (block_rsv->durable && | |
3686 | block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes) | |
3687 | commit_trans = 1; | |
3688 | } | |
3689 | spin_unlock(&block_rsv->lock); | |
3690 | if (!ret) | |
3691 | return 0; | |
3692 | ||
3693 | if (block_rsv->refill_used) { | |
8bb8ab2e JB |
3694 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
3695 | num_bytes, 0); | |
f0486c68 YZ |
3696 | if (!ret) { |
3697 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
3698 | return 0; | |
4e06bdd6 | 3699 | } |
f0486c68 | 3700 | } |
9ed74f2d | 3701 | |
f0486c68 YZ |
3702 | if (commit_trans) { |
3703 | if (trans) | |
3704 | return -EAGAIN; | |
3705 | ||
7a7eaa40 | 3706 | trans = btrfs_join_transaction(root); |
f0486c68 YZ |
3707 | BUG_ON(IS_ERR(trans)); |
3708 | ret = btrfs_commit_transaction(trans, root); | |
3709 | return 0; | |
6a63209f | 3710 | } |
9ed74f2d | 3711 | |
f0486c68 YZ |
3712 | return -ENOSPC; |
3713 | } | |
3714 | ||
3715 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
3716 | struct btrfs_block_rsv *dst_rsv, | |
3717 | u64 num_bytes) | |
3718 | { | |
3719 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3720 | } | |
3721 | ||
3722 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3723 | struct btrfs_block_rsv *block_rsv, | |
3724 | u64 num_bytes) | |
3725 | { | |
3726 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3727 | if (global_rsv->full || global_rsv == block_rsv || | |
3728 | block_rsv->space_info != global_rsv->space_info) | |
3729 | global_rsv = NULL; | |
3730 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
6a63209f JB |
3731 | } |
3732 | ||
3733 | /* | |
8929ecfa YZ |
3734 | * helper to calculate size of global block reservation. |
3735 | * the desired value is sum of space used by extent tree, | |
3736 | * checksum tree and root tree | |
6a63209f | 3737 | */ |
8929ecfa | 3738 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 3739 | { |
8929ecfa YZ |
3740 | struct btrfs_space_info *sinfo; |
3741 | u64 num_bytes; | |
3742 | u64 meta_used; | |
3743 | u64 data_used; | |
3744 | int csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
6a63209f | 3745 | |
8929ecfa YZ |
3746 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
3747 | spin_lock(&sinfo->lock); | |
3748 | data_used = sinfo->bytes_used; | |
3749 | spin_unlock(&sinfo->lock); | |
33b4d47f | 3750 | |
8929ecfa YZ |
3751 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
3752 | spin_lock(&sinfo->lock); | |
6d48755d JB |
3753 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
3754 | data_used = 0; | |
8929ecfa YZ |
3755 | meta_used = sinfo->bytes_used; |
3756 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 3757 | |
8929ecfa YZ |
3758 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
3759 | csum_size * 2; | |
3760 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 3761 | |
8929ecfa YZ |
3762 | if (num_bytes * 3 > meta_used) |
3763 | num_bytes = div64_u64(meta_used, 3); | |
ab6e2410 | 3764 | |
8929ecfa YZ |
3765 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
3766 | } | |
6a63209f | 3767 | |
8929ecfa YZ |
3768 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
3769 | { | |
3770 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3771 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3772 | u64 num_bytes; | |
6a63209f | 3773 | |
8929ecfa | 3774 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 3775 | |
8929ecfa YZ |
3776 | spin_lock(&block_rsv->lock); |
3777 | spin_lock(&sinfo->lock); | |
4e06bdd6 | 3778 | |
8929ecfa | 3779 | block_rsv->size = num_bytes; |
4e06bdd6 | 3780 | |
8929ecfa | 3781 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
3782 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
3783 | sinfo->bytes_may_use; | |
8929ecfa YZ |
3784 | |
3785 | if (sinfo->total_bytes > num_bytes) { | |
3786 | num_bytes = sinfo->total_bytes - num_bytes; | |
3787 | block_rsv->reserved += num_bytes; | |
3788 | sinfo->bytes_reserved += num_bytes; | |
6a63209f | 3789 | } |
6a63209f | 3790 | |
8929ecfa YZ |
3791 | if (block_rsv->reserved >= block_rsv->size) { |
3792 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3793 | sinfo->bytes_reserved -= num_bytes; | |
36e39c40 | 3794 | sinfo->reservation_progress++; |
8929ecfa YZ |
3795 | block_rsv->reserved = block_rsv->size; |
3796 | block_rsv->full = 1; | |
3797 | } | |
182608c8 | 3798 | |
8929ecfa YZ |
3799 | spin_unlock(&sinfo->lock); |
3800 | spin_unlock(&block_rsv->lock); | |
6a63209f JB |
3801 | } |
3802 | ||
f0486c68 | 3803 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3804 | { |
f0486c68 | 3805 | struct btrfs_space_info *space_info; |
6a63209f | 3806 | |
f0486c68 YZ |
3807 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
3808 | fs_info->chunk_block_rsv.space_info = space_info; | |
3809 | fs_info->chunk_block_rsv.priority = 10; | |
6a63209f | 3810 | |
f0486c68 | 3811 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa YZ |
3812 | fs_info->global_block_rsv.space_info = space_info; |
3813 | fs_info->global_block_rsv.priority = 10; | |
3814 | fs_info->global_block_rsv.refill_used = 1; | |
3815 | fs_info->delalloc_block_rsv.space_info = space_info; | |
f0486c68 YZ |
3816 | fs_info->trans_block_rsv.space_info = space_info; |
3817 | fs_info->empty_block_rsv.space_info = space_info; | |
3818 | fs_info->empty_block_rsv.priority = 10; | |
3819 | ||
8929ecfa YZ |
3820 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
3821 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
3822 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
3823 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 3824 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa YZ |
3825 | |
3826 | btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv); | |
3827 | ||
3828 | btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv); | |
3829 | ||
3830 | update_global_block_rsv(fs_info); | |
6a63209f JB |
3831 | } |
3832 | ||
8929ecfa | 3833 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3834 | { |
8929ecfa YZ |
3835 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); |
3836 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
3837 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
3838 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
3839 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
3840 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
3841 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
f0486c68 | 3842 | } |
6a63209f | 3843 | |
fcb80c2a JB |
3844 | int btrfs_truncate_reserve_metadata(struct btrfs_trans_handle *trans, |
3845 | struct btrfs_root *root, | |
3846 | struct btrfs_block_rsv *rsv) | |
3847 | { | |
3848 | struct btrfs_block_rsv *trans_rsv = &root->fs_info->trans_block_rsv; | |
3849 | u64 num_bytes; | |
3850 | int ret; | |
3851 | ||
3852 | /* | |
3853 | * Truncate should be freeing data, but give us 2 items just in case it | |
3854 | * needs to use some space. We may want to be smarter about this in the | |
3855 | * future. | |
3856 | */ | |
ff5714cc | 3857 | num_bytes = btrfs_calc_trans_metadata_size(root, 2); |
fcb80c2a JB |
3858 | |
3859 | /* We already have enough bytes, just return */ | |
3860 | if (rsv->reserved >= num_bytes) | |
3861 | return 0; | |
3862 | ||
3863 | num_bytes -= rsv->reserved; | |
3864 | ||
3865 | /* | |
3866 | * You should have reserved enough space before hand to do this, so this | |
3867 | * should not fail. | |
3868 | */ | |
3869 | ret = block_rsv_migrate_bytes(trans_rsv, rsv, num_bytes); | |
3870 | BUG_ON(ret); | |
3871 | ||
3872 | return 0; | |
3873 | } | |
3874 | ||
a22285a6 YZ |
3875 | int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans, |
3876 | struct btrfs_root *root, | |
8bb8ab2e | 3877 | int num_items) |
a22285a6 YZ |
3878 | { |
3879 | u64 num_bytes; | |
3880 | int ret; | |
6a63209f | 3881 | |
a22285a6 YZ |
3882 | if (num_items == 0 || root->fs_info->chunk_root == root) |
3883 | return 0; | |
6a63209f | 3884 | |
16cdcec7 | 3885 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
a22285a6 | 3886 | ret = btrfs_block_rsv_add(trans, root, &root->fs_info->trans_block_rsv, |
8bb8ab2e | 3887 | num_bytes); |
a22285a6 YZ |
3888 | if (!ret) { |
3889 | trans->bytes_reserved += num_bytes; | |
3890 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
3891 | } | |
3892 | return ret; | |
6a63209f JB |
3893 | } |
3894 | ||
a22285a6 YZ |
3895 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
3896 | struct btrfs_root *root) | |
6a63209f | 3897 | { |
a22285a6 YZ |
3898 | if (!trans->bytes_reserved) |
3899 | return; | |
6a63209f | 3900 | |
a22285a6 YZ |
3901 | BUG_ON(trans->block_rsv != &root->fs_info->trans_block_rsv); |
3902 | btrfs_block_rsv_release(root, trans->block_rsv, | |
3903 | trans->bytes_reserved); | |
3904 | trans->bytes_reserved = 0; | |
3905 | } | |
6a63209f | 3906 | |
d68fc57b YZ |
3907 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
3908 | struct inode *inode) | |
3909 | { | |
3910 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3911 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3912 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
3913 | ||
3914 | /* | |
fcb80c2a JB |
3915 | * We need to hold space in order to delete our orphan item once we've |
3916 | * added it, so this takes the reservation so we can release it later | |
3917 | * when we are truly done with the orphan item. | |
d68fc57b | 3918 | */ |
ff5714cc | 3919 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b | 3920 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
3921 | } |
3922 | ||
d68fc57b | 3923 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 3924 | { |
d68fc57b | 3925 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 3926 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b YZ |
3927 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
3928 | } | |
97e728d4 | 3929 | |
a22285a6 YZ |
3930 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
3931 | struct btrfs_pending_snapshot *pending) | |
3932 | { | |
3933 | struct btrfs_root *root = pending->root; | |
3934 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3935 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
3936 | /* | |
3937 | * two for root back/forward refs, two for directory entries | |
3938 | * and one for root of the snapshot. | |
3939 | */ | |
16cdcec7 | 3940 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5); |
a22285a6 YZ |
3941 | dst_rsv->space_info = src_rsv->space_info; |
3942 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
3943 | } |
3944 | ||
0ca1f7ce | 3945 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes) |
6324fbf3 | 3946 | { |
0ca1f7ce YZ |
3947 | return num_bytes >>= 3; |
3948 | } | |
c146afad | 3949 | |
0ca1f7ce YZ |
3950 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
3951 | { | |
3952 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3953 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
3954 | u64 to_reserve; | |
3955 | int nr_extents; | |
57a45ced | 3956 | int reserved_extents; |
0ca1f7ce | 3957 | int ret; |
6324fbf3 | 3958 | |
0ca1f7ce YZ |
3959 | if (btrfs_transaction_in_commit(root->fs_info)) |
3960 | schedule_timeout(1); | |
ec44a35c | 3961 | |
0ca1f7ce | 3962 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 3963 | |
0ca1f7ce | 3964 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents) + 1; |
57a45ced JB |
3965 | reserved_extents = atomic_read(&BTRFS_I(inode)->reserved_extents); |
3966 | ||
3967 | if (nr_extents > reserved_extents) { | |
3968 | nr_extents -= reserved_extents; | |
16cdcec7 | 3969 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); |
0ca1f7ce YZ |
3970 | } else { |
3971 | nr_extents = 0; | |
3972 | to_reserve = 0; | |
593060d7 | 3973 | } |
57a45ced | 3974 | |
0ca1f7ce | 3975 | to_reserve += calc_csum_metadata_size(inode, num_bytes); |
8bb8ab2e JB |
3976 | ret = reserve_metadata_bytes(NULL, root, block_rsv, to_reserve, 1); |
3977 | if (ret) | |
0ca1f7ce | 3978 | return ret; |
6324fbf3 | 3979 | |
57a45ced | 3980 | atomic_add(nr_extents, &BTRFS_I(inode)->reserved_extents); |
0ca1f7ce | 3981 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); |
25179201 | 3982 | |
0ca1f7ce YZ |
3983 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
3984 | ||
3985 | if (block_rsv->size > 512 * 1024 * 1024) | |
0019f10d | 3986 | shrink_delalloc(NULL, root, to_reserve, 0); |
0ca1f7ce YZ |
3987 | |
3988 | return 0; | |
3989 | } | |
3990 | ||
3991 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) | |
3992 | { | |
3993 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3994 | u64 to_free; | |
3995 | int nr_extents; | |
57a45ced | 3996 | int reserved_extents; |
0ca1f7ce YZ |
3997 | |
3998 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
3999 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); | |
3c14874a | 4000 | WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents) < 0); |
0ca1f7ce | 4001 | |
57a45ced JB |
4002 | reserved_extents = atomic_read(&BTRFS_I(inode)->reserved_extents); |
4003 | do { | |
4004 | int old, new; | |
4005 | ||
4006 | nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents); | |
4007 | if (nr_extents >= reserved_extents) { | |
4008 | nr_extents = 0; | |
4009 | break; | |
4010 | } | |
4011 | old = reserved_extents; | |
4012 | nr_extents = reserved_extents - nr_extents; | |
4013 | new = reserved_extents - nr_extents; | |
4014 | old = atomic_cmpxchg(&BTRFS_I(inode)->reserved_extents, | |
4015 | reserved_extents, new); | |
4016 | if (likely(old == reserved_extents)) | |
4017 | break; | |
4018 | reserved_extents = old; | |
4019 | } while (1); | |
97e728d4 | 4020 | |
0ca1f7ce YZ |
4021 | to_free = calc_csum_metadata_size(inode, num_bytes); |
4022 | if (nr_extents > 0) | |
16cdcec7 | 4023 | to_free += btrfs_calc_trans_metadata_size(root, nr_extents); |
0ca1f7ce YZ |
4024 | |
4025 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
4026 | to_free); | |
4027 | } | |
4028 | ||
4029 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) | |
4030 | { | |
4031 | int ret; | |
4032 | ||
4033 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4034 | if (ret) |
0ca1f7ce YZ |
4035 | return ret; |
4036 | ||
4037 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4038 | if (ret) { | |
4039 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4040 | return ret; | |
4041 | } | |
4042 | ||
4043 | return 0; | |
4044 | } | |
4045 | ||
4046 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) | |
4047 | { | |
4048 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4049 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4050 | } |
4051 | ||
9078a3e1 CM |
4052 | static int update_block_group(struct btrfs_trans_handle *trans, |
4053 | struct btrfs_root *root, | |
f0486c68 | 4054 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4055 | { |
0af3d00b | 4056 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4057 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4058 | u64 total = num_bytes; |
9078a3e1 | 4059 | u64 old_val; |
db94535d | 4060 | u64 byte_in_group; |
0af3d00b | 4061 | int factor; |
3e1ad54f | 4062 | |
5d4f98a2 YZ |
4063 | /* block accounting for super block */ |
4064 | spin_lock(&info->delalloc_lock); | |
4065 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
4066 | if (alloc) | |
4067 | old_val += num_bytes; | |
4068 | else | |
4069 | old_val -= num_bytes; | |
4070 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
5d4f98a2 YZ |
4071 | spin_unlock(&info->delalloc_lock); |
4072 | ||
d397712b | 4073 | while (total) { |
db94535d | 4074 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4075 | if (!cache) |
9078a3e1 | 4076 | return -1; |
b742bb82 YZ |
4077 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4078 | BTRFS_BLOCK_GROUP_RAID1 | | |
4079 | BTRFS_BLOCK_GROUP_RAID10)) | |
4080 | factor = 2; | |
4081 | else | |
4082 | factor = 1; | |
9d66e233 JB |
4083 | /* |
4084 | * If this block group has free space cache written out, we | |
4085 | * need to make sure to load it if we are removing space. This | |
4086 | * is because we need the unpinning stage to actually add the | |
4087 | * space back to the block group, otherwise we will leak space. | |
4088 | */ | |
4089 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
b8399dee | 4090 | cache_block_group(cache, trans, NULL, 1); |
0af3d00b | 4091 | |
db94535d CM |
4092 | byte_in_group = bytenr - cache->key.objectid; |
4093 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4094 | |
25179201 | 4095 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4096 | spin_lock(&cache->lock); |
0af3d00b JB |
4097 | |
4098 | if (btrfs_super_cache_generation(&info->super_copy) != 0 && | |
4099 | cache->disk_cache_state < BTRFS_DC_CLEAR) | |
4100 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4101 | ||
0f9dd46c | 4102 | cache->dirty = 1; |
9078a3e1 | 4103 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4104 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4105 | if (alloc) { |
db94535d | 4106 | old_val += num_bytes; |
11833d66 YZ |
4107 | btrfs_set_block_group_used(&cache->item, old_val); |
4108 | cache->reserved -= num_bytes; | |
11833d66 | 4109 | cache->space_info->bytes_reserved -= num_bytes; |
36e39c40 | 4110 | cache->space_info->reservation_progress++; |
b742bb82 YZ |
4111 | cache->space_info->bytes_used += num_bytes; |
4112 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4113 | spin_unlock(&cache->lock); |
25179201 | 4114 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4115 | } else { |
db94535d | 4116 | old_val -= num_bytes; |
c286ac48 | 4117 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4118 | cache->pinned += num_bytes; |
4119 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4120 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4121 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4122 | spin_unlock(&cache->lock); |
25179201 | 4123 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4124 | |
f0486c68 YZ |
4125 | set_extent_dirty(info->pinned_extents, |
4126 | bytenr, bytenr + num_bytes - 1, | |
4127 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4128 | } |
fa9c0d79 | 4129 | btrfs_put_block_group(cache); |
db94535d CM |
4130 | total -= num_bytes; |
4131 | bytenr += num_bytes; | |
9078a3e1 CM |
4132 | } |
4133 | return 0; | |
4134 | } | |
6324fbf3 | 4135 | |
a061fc8d CM |
4136 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4137 | { | |
0f9dd46c | 4138 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4139 | u64 bytenr; |
0f9dd46c JB |
4140 | |
4141 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
4142 | if (!cache) | |
a061fc8d | 4143 | return 0; |
0f9dd46c | 4144 | |
d2fb3437 | 4145 | bytenr = cache->key.objectid; |
fa9c0d79 | 4146 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4147 | |
4148 | return bytenr; | |
a061fc8d CM |
4149 | } |
4150 | ||
f0486c68 YZ |
4151 | static int pin_down_extent(struct btrfs_root *root, |
4152 | struct btrfs_block_group_cache *cache, | |
4153 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4154 | { |
11833d66 YZ |
4155 | spin_lock(&cache->space_info->lock); |
4156 | spin_lock(&cache->lock); | |
4157 | cache->pinned += num_bytes; | |
4158 | cache->space_info->bytes_pinned += num_bytes; | |
4159 | if (reserved) { | |
4160 | cache->reserved -= num_bytes; | |
4161 | cache->space_info->bytes_reserved -= num_bytes; | |
36e39c40 | 4162 | cache->space_info->reservation_progress++; |
11833d66 YZ |
4163 | } |
4164 | spin_unlock(&cache->lock); | |
4165 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4166 | |
f0486c68 YZ |
4167 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4168 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4169 | return 0; | |
4170 | } | |
68b38550 | 4171 | |
f0486c68 YZ |
4172 | /* |
4173 | * this function must be called within transaction | |
4174 | */ | |
4175 | int btrfs_pin_extent(struct btrfs_root *root, | |
4176 | u64 bytenr, u64 num_bytes, int reserved) | |
4177 | { | |
4178 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4179 | |
f0486c68 YZ |
4180 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
4181 | BUG_ON(!cache); | |
4182 | ||
4183 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4184 | ||
4185 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4186 | return 0; |
4187 | } | |
4188 | ||
f0486c68 YZ |
4189 | /* |
4190 | * update size of reserved extents. this function may return -EAGAIN | |
4191 | * if 'reserve' is true or 'sinfo' is false. | |
4192 | */ | |
b4d00d56 LD |
4193 | int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
4194 | u64 num_bytes, int reserve, int sinfo) | |
11833d66 | 4195 | { |
f0486c68 YZ |
4196 | int ret = 0; |
4197 | if (sinfo) { | |
4198 | struct btrfs_space_info *space_info = cache->space_info; | |
4199 | spin_lock(&space_info->lock); | |
4200 | spin_lock(&cache->lock); | |
4201 | if (reserve) { | |
4202 | if (cache->ro) { | |
4203 | ret = -EAGAIN; | |
4204 | } else { | |
4205 | cache->reserved += num_bytes; | |
4206 | space_info->bytes_reserved += num_bytes; | |
4207 | } | |
4208 | } else { | |
4209 | if (cache->ro) | |
4210 | space_info->bytes_readonly += num_bytes; | |
4211 | cache->reserved -= num_bytes; | |
4212 | space_info->bytes_reserved -= num_bytes; | |
36e39c40 | 4213 | space_info->reservation_progress++; |
f0486c68 YZ |
4214 | } |
4215 | spin_unlock(&cache->lock); | |
4216 | spin_unlock(&space_info->lock); | |
11833d66 | 4217 | } else { |
f0486c68 YZ |
4218 | spin_lock(&cache->lock); |
4219 | if (cache->ro) { | |
4220 | ret = -EAGAIN; | |
4221 | } else { | |
4222 | if (reserve) | |
4223 | cache->reserved += num_bytes; | |
4224 | else | |
4225 | cache->reserved -= num_bytes; | |
4226 | } | |
4227 | spin_unlock(&cache->lock); | |
324ae4df | 4228 | } |
f0486c68 | 4229 | return ret; |
324ae4df | 4230 | } |
9078a3e1 | 4231 | |
11833d66 YZ |
4232 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
4233 | struct btrfs_root *root) | |
e8569813 | 4234 | { |
e8569813 | 4235 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
4236 | struct btrfs_caching_control *next; |
4237 | struct btrfs_caching_control *caching_ctl; | |
4238 | struct btrfs_block_group_cache *cache; | |
e8569813 | 4239 | |
11833d66 | 4240 | down_write(&fs_info->extent_commit_sem); |
25179201 | 4241 | |
11833d66 YZ |
4242 | list_for_each_entry_safe(caching_ctl, next, |
4243 | &fs_info->caching_block_groups, list) { | |
4244 | cache = caching_ctl->block_group; | |
4245 | if (block_group_cache_done(cache)) { | |
4246 | cache->last_byte_to_unpin = (u64)-1; | |
4247 | list_del_init(&caching_ctl->list); | |
4248 | put_caching_control(caching_ctl); | |
e8569813 | 4249 | } else { |
11833d66 | 4250 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 4251 | } |
e8569813 | 4252 | } |
11833d66 YZ |
4253 | |
4254 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
4255 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
4256 | else | |
4257 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
4258 | ||
4259 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
4260 | |
4261 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
4262 | return 0; |
4263 | } | |
4264 | ||
11833d66 | 4265 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 4266 | { |
11833d66 YZ |
4267 | struct btrfs_fs_info *fs_info = root->fs_info; |
4268 | struct btrfs_block_group_cache *cache = NULL; | |
4269 | u64 len; | |
ccd467d6 | 4270 | |
11833d66 YZ |
4271 | while (start <= end) { |
4272 | if (!cache || | |
4273 | start >= cache->key.objectid + cache->key.offset) { | |
4274 | if (cache) | |
4275 | btrfs_put_block_group(cache); | |
4276 | cache = btrfs_lookup_block_group(fs_info, start); | |
4277 | BUG_ON(!cache); | |
4278 | } | |
4279 | ||
4280 | len = cache->key.objectid + cache->key.offset - start; | |
4281 | len = min(len, end + 1 - start); | |
4282 | ||
4283 | if (start < cache->last_byte_to_unpin) { | |
4284 | len = min(len, cache->last_byte_to_unpin - start); | |
4285 | btrfs_add_free_space(cache, start, len); | |
4286 | } | |
4287 | ||
f0486c68 YZ |
4288 | start += len; |
4289 | ||
11833d66 YZ |
4290 | spin_lock(&cache->space_info->lock); |
4291 | spin_lock(&cache->lock); | |
4292 | cache->pinned -= len; | |
4293 | cache->space_info->bytes_pinned -= len; | |
f0486c68 YZ |
4294 | if (cache->ro) { |
4295 | cache->space_info->bytes_readonly += len; | |
4296 | } else if (cache->reserved_pinned > 0) { | |
4297 | len = min(len, cache->reserved_pinned); | |
4298 | cache->reserved_pinned -= len; | |
4299 | cache->space_info->bytes_reserved += len; | |
4300 | } | |
11833d66 YZ |
4301 | spin_unlock(&cache->lock); |
4302 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 4303 | } |
11833d66 YZ |
4304 | |
4305 | if (cache) | |
4306 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
4307 | return 0; |
4308 | } | |
4309 | ||
4310 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 4311 | struct btrfs_root *root) |
a28ec197 | 4312 | { |
11833d66 YZ |
4313 | struct btrfs_fs_info *fs_info = root->fs_info; |
4314 | struct extent_io_tree *unpin; | |
f0486c68 YZ |
4315 | struct btrfs_block_rsv *block_rsv; |
4316 | struct btrfs_block_rsv *next_rsv; | |
1a5bc167 CM |
4317 | u64 start; |
4318 | u64 end; | |
f0486c68 | 4319 | int idx; |
a28ec197 | 4320 | int ret; |
a28ec197 | 4321 | |
11833d66 YZ |
4322 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4323 | unpin = &fs_info->freed_extents[1]; | |
4324 | else | |
4325 | unpin = &fs_info->freed_extents[0]; | |
4326 | ||
d397712b | 4327 | while (1) { |
1a5bc167 CM |
4328 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4329 | EXTENT_DIRTY); | |
4330 | if (ret) | |
a28ec197 | 4331 | break; |
1f3c79a2 | 4332 | |
5378e607 LD |
4333 | if (btrfs_test_opt(root, DISCARD)) |
4334 | ret = btrfs_discard_extent(root, start, | |
4335 | end + 1 - start, NULL); | |
1f3c79a2 | 4336 | |
1a5bc167 | 4337 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4338 | unpin_extent_range(root, start, end); |
b9473439 | 4339 | cond_resched(); |
a28ec197 | 4340 | } |
817d52f8 | 4341 | |
f0486c68 YZ |
4342 | mutex_lock(&fs_info->durable_block_rsv_mutex); |
4343 | list_for_each_entry_safe(block_rsv, next_rsv, | |
4344 | &fs_info->durable_block_rsv_list, list) { | |
444528b3 | 4345 | |
f0486c68 YZ |
4346 | idx = trans->transid & 0x1; |
4347 | if (block_rsv->freed[idx] > 0) { | |
4348 | block_rsv_add_bytes(block_rsv, | |
4349 | block_rsv->freed[idx], 0); | |
4350 | block_rsv->freed[idx] = 0; | |
4351 | } | |
4352 | if (atomic_read(&block_rsv->usage) == 0) { | |
4353 | btrfs_block_rsv_release(root, block_rsv, (u64)-1); | |
31840ae1 | 4354 | |
f0486c68 YZ |
4355 | if (block_rsv->freed[0] == 0 && |
4356 | block_rsv->freed[1] == 0) { | |
4357 | list_del_init(&block_rsv->list); | |
4358 | kfree(block_rsv); | |
4359 | } | |
4360 | } else { | |
4361 | btrfs_block_rsv_release(root, block_rsv, 0); | |
8ef97622 | 4362 | } |
f4b9aa8d | 4363 | } |
f0486c68 | 4364 | mutex_unlock(&fs_info->durable_block_rsv_mutex); |
31840ae1 | 4365 | |
e20d96d6 CM |
4366 | return 0; |
4367 | } | |
4368 | ||
5d4f98a2 YZ |
4369 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4370 | struct btrfs_root *root, | |
4371 | u64 bytenr, u64 num_bytes, u64 parent, | |
4372 | u64 root_objectid, u64 owner_objectid, | |
4373 | u64 owner_offset, int refs_to_drop, | |
4374 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4375 | { |
e2fa7227 | 4376 | struct btrfs_key key; |
5d4f98a2 | 4377 | struct btrfs_path *path; |
1261ec42 CM |
4378 | struct btrfs_fs_info *info = root->fs_info; |
4379 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4380 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4381 | struct btrfs_extent_item *ei; |
4382 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4383 | int ret; |
5d4f98a2 | 4384 | int is_data; |
952fccac CM |
4385 | int extent_slot = 0; |
4386 | int found_extent = 0; | |
4387 | int num_to_del = 1; | |
5d4f98a2 YZ |
4388 | u32 item_size; |
4389 | u64 refs; | |
037e6390 | 4390 | |
5caf2a00 | 4391 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4392 | if (!path) |
4393 | return -ENOMEM; | |
5f26f772 | 4394 | |
3c12ac72 | 4395 | path->reada = 1; |
b9473439 | 4396 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4397 | |
4398 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4399 | BUG_ON(!is_data && refs_to_drop != 1); | |
4400 | ||
4401 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4402 | bytenr, num_bytes, parent, | |
4403 | root_objectid, owner_objectid, | |
4404 | owner_offset); | |
7bb86316 | 4405 | if (ret == 0) { |
952fccac | 4406 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4407 | while (extent_slot >= 0) { |
4408 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4409 | extent_slot); |
5d4f98a2 | 4410 | if (key.objectid != bytenr) |
952fccac | 4411 | break; |
5d4f98a2 YZ |
4412 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4413 | key.offset == num_bytes) { | |
952fccac CM |
4414 | found_extent = 1; |
4415 | break; | |
4416 | } | |
4417 | if (path->slots[0] - extent_slot > 5) | |
4418 | break; | |
5d4f98a2 | 4419 | extent_slot--; |
952fccac | 4420 | } |
5d4f98a2 YZ |
4421 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4422 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4423 | if (found_extent && item_size < sizeof(*ei)) | |
4424 | found_extent = 0; | |
4425 | #endif | |
31840ae1 | 4426 | if (!found_extent) { |
5d4f98a2 | 4427 | BUG_ON(iref); |
56bec294 | 4428 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4429 | NULL, refs_to_drop, |
4430 | is_data); | |
31840ae1 | 4431 | BUG_ON(ret); |
b3b4aa74 | 4432 | btrfs_release_path(path); |
b9473439 | 4433 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4434 | |
4435 | key.objectid = bytenr; | |
4436 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4437 | key.offset = num_bytes; | |
4438 | ||
31840ae1 ZY |
4439 | ret = btrfs_search_slot(trans, extent_root, |
4440 | &key, path, -1, 1); | |
f3465ca4 JB |
4441 | if (ret) { |
4442 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4443 | ", was looking for %llu\n", ret, |
4444 | (unsigned long long)bytenr); | |
f3465ca4 JB |
4445 | btrfs_print_leaf(extent_root, path->nodes[0]); |
4446 | } | |
31840ae1 ZY |
4447 | BUG_ON(ret); |
4448 | extent_slot = path->slots[0]; | |
4449 | } | |
7bb86316 CM |
4450 | } else { |
4451 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4452 | WARN_ON(1); | |
d397712b | 4453 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4454 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4455 | (unsigned long long)bytenr, |
56bec294 | 4456 | (unsigned long long)parent, |
d397712b | 4457 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4458 | (unsigned long long)owner_objectid, |
4459 | (unsigned long long)owner_offset); | |
7bb86316 | 4460 | } |
5f39d397 CM |
4461 | |
4462 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4463 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4464 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4465 | if (item_size < sizeof(*ei)) { | |
4466 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4467 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4468 | owner_objectid, 0); | |
4469 | BUG_ON(ret < 0); | |
4470 | ||
b3b4aa74 | 4471 | btrfs_release_path(path); |
5d4f98a2 YZ |
4472 | path->leave_spinning = 1; |
4473 | ||
4474 | key.objectid = bytenr; | |
4475 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4476 | key.offset = num_bytes; | |
4477 | ||
4478 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4479 | -1, 1); | |
4480 | if (ret) { | |
4481 | printk(KERN_ERR "umm, got %d back from search" | |
4482 | ", was looking for %llu\n", ret, | |
4483 | (unsigned long long)bytenr); | |
4484 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4485 | } | |
4486 | BUG_ON(ret); | |
4487 | extent_slot = path->slots[0]; | |
4488 | leaf = path->nodes[0]; | |
4489 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4490 | } | |
4491 | #endif | |
4492 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4493 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4494 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4495 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4496 | struct btrfs_tree_block_info *bi; | |
4497 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4498 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4499 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4500 | } | |
56bec294 | 4501 | |
5d4f98a2 | 4502 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4503 | BUG_ON(refs < refs_to_drop); |
4504 | refs -= refs_to_drop; | |
5f39d397 | 4505 | |
5d4f98a2 YZ |
4506 | if (refs > 0) { |
4507 | if (extent_op) | |
4508 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4509 | /* | |
4510 | * In the case of inline back ref, reference count will | |
4511 | * be updated by remove_extent_backref | |
952fccac | 4512 | */ |
5d4f98a2 YZ |
4513 | if (iref) { |
4514 | BUG_ON(!found_extent); | |
4515 | } else { | |
4516 | btrfs_set_extent_refs(leaf, ei, refs); | |
4517 | btrfs_mark_buffer_dirty(leaf); | |
4518 | } | |
4519 | if (found_extent) { | |
4520 | ret = remove_extent_backref(trans, extent_root, path, | |
4521 | iref, refs_to_drop, | |
4522 | is_data); | |
952fccac CM |
4523 | BUG_ON(ret); |
4524 | } | |
5d4f98a2 | 4525 | } else { |
5d4f98a2 YZ |
4526 | if (found_extent) { |
4527 | BUG_ON(is_data && refs_to_drop != | |
4528 | extent_data_ref_count(root, path, iref)); | |
4529 | if (iref) { | |
4530 | BUG_ON(path->slots[0] != extent_slot); | |
4531 | } else { | |
4532 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4533 | path->slots[0] = extent_slot; | |
4534 | num_to_del = 2; | |
4535 | } | |
78fae27e | 4536 | } |
b9473439 | 4537 | |
952fccac CM |
4538 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4539 | num_to_del); | |
31840ae1 | 4540 | BUG_ON(ret); |
b3b4aa74 | 4541 | btrfs_release_path(path); |
21af804c | 4542 | |
5d4f98a2 | 4543 | if (is_data) { |
459931ec CM |
4544 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4545 | BUG_ON(ret); | |
d57e62b8 CM |
4546 | } else { |
4547 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4548 | bytenr >> PAGE_CACHE_SHIFT, | |
4549 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4550 | } |
4551 | ||
f0486c68 | 4552 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4553 | BUG_ON(ret); |
a28ec197 | 4554 | } |
5caf2a00 | 4555 | btrfs_free_path(path); |
a28ec197 CM |
4556 | return ret; |
4557 | } | |
4558 | ||
1887be66 | 4559 | /* |
f0486c68 | 4560 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4561 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4562 | * a given extent, and if there are no other delayed refs to be processed, it | |
4563 | * removes it from the tree. | |
4564 | */ | |
4565 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4566 | struct btrfs_root *root, u64 bytenr) | |
4567 | { | |
4568 | struct btrfs_delayed_ref_head *head; | |
4569 | struct btrfs_delayed_ref_root *delayed_refs; | |
4570 | struct btrfs_delayed_ref_node *ref; | |
4571 | struct rb_node *node; | |
f0486c68 | 4572 | int ret = 0; |
1887be66 CM |
4573 | |
4574 | delayed_refs = &trans->transaction->delayed_refs; | |
4575 | spin_lock(&delayed_refs->lock); | |
4576 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4577 | if (!head) | |
4578 | goto out; | |
4579 | ||
4580 | node = rb_prev(&head->node.rb_node); | |
4581 | if (!node) | |
4582 | goto out; | |
4583 | ||
4584 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4585 | ||
4586 | /* there are still entries for this ref, we can't drop it */ | |
4587 | if (ref->bytenr == bytenr) | |
4588 | goto out; | |
4589 | ||
5d4f98a2 YZ |
4590 | if (head->extent_op) { |
4591 | if (!head->must_insert_reserved) | |
4592 | goto out; | |
4593 | kfree(head->extent_op); | |
4594 | head->extent_op = NULL; | |
4595 | } | |
4596 | ||
1887be66 CM |
4597 | /* |
4598 | * waiting for the lock here would deadlock. If someone else has it | |
4599 | * locked they are already in the process of dropping it anyway | |
4600 | */ | |
4601 | if (!mutex_trylock(&head->mutex)) | |
4602 | goto out; | |
4603 | ||
4604 | /* | |
4605 | * at this point we have a head with no other entries. Go | |
4606 | * ahead and process it. | |
4607 | */ | |
4608 | head->node.in_tree = 0; | |
4609 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4610 | |
1887be66 CM |
4611 | delayed_refs->num_entries--; |
4612 | ||
4613 | /* | |
4614 | * we don't take a ref on the node because we're removing it from the | |
4615 | * tree, so we just steal the ref the tree was holding. | |
4616 | */ | |
c3e69d58 CM |
4617 | delayed_refs->num_heads--; |
4618 | if (list_empty(&head->cluster)) | |
4619 | delayed_refs->num_heads_ready--; | |
4620 | ||
4621 | list_del_init(&head->cluster); | |
1887be66 CM |
4622 | spin_unlock(&delayed_refs->lock); |
4623 | ||
f0486c68 YZ |
4624 | BUG_ON(head->extent_op); |
4625 | if (head->must_insert_reserved) | |
4626 | ret = 1; | |
4627 | ||
4628 | mutex_unlock(&head->mutex); | |
1887be66 | 4629 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4630 | return ret; |
1887be66 CM |
4631 | out: |
4632 | spin_unlock(&delayed_refs->lock); | |
4633 | return 0; | |
4634 | } | |
4635 | ||
f0486c68 YZ |
4636 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4637 | struct btrfs_root *root, | |
4638 | struct extent_buffer *buf, | |
4639 | u64 parent, int last_ref) | |
4640 | { | |
4641 | struct btrfs_block_rsv *block_rsv; | |
4642 | struct btrfs_block_group_cache *cache = NULL; | |
4643 | int ret; | |
4644 | ||
4645 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4646 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4647 | parent, root->root_key.objectid, | |
4648 | btrfs_header_level(buf), | |
4649 | BTRFS_DROP_DELAYED_REF, NULL); | |
4650 | BUG_ON(ret); | |
4651 | } | |
4652 | ||
4653 | if (!last_ref) | |
4654 | return; | |
4655 | ||
4656 | block_rsv = get_block_rsv(trans, root); | |
4657 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); | |
3bf84a5a YZ |
4658 | if (block_rsv->space_info != cache->space_info) |
4659 | goto out; | |
f0486c68 YZ |
4660 | |
4661 | if (btrfs_header_generation(buf) == trans->transid) { | |
4662 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4663 | ret = check_ref_cleanup(trans, root, buf->start); | |
4664 | if (!ret) | |
4665 | goto pin; | |
4666 | } | |
4667 | ||
4668 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4669 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
4670 | goto pin; | |
4671 | } | |
4672 | ||
4673 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4674 | ||
4675 | btrfs_add_free_space(cache, buf->start, buf->len); | |
b4d00d56 | 4676 | ret = btrfs_update_reserved_bytes(cache, buf->len, 0, 0); |
f0486c68 YZ |
4677 | if (ret == -EAGAIN) { |
4678 | /* block group became read-only */ | |
b4d00d56 | 4679 | btrfs_update_reserved_bytes(cache, buf->len, 0, 1); |
f0486c68 YZ |
4680 | goto out; |
4681 | } | |
4682 | ||
4683 | ret = 1; | |
4684 | spin_lock(&block_rsv->lock); | |
4685 | if (block_rsv->reserved < block_rsv->size) { | |
4686 | block_rsv->reserved += buf->len; | |
4687 | ret = 0; | |
4688 | } | |
4689 | spin_unlock(&block_rsv->lock); | |
4690 | ||
4691 | if (ret) { | |
4692 | spin_lock(&cache->space_info->lock); | |
4693 | cache->space_info->bytes_reserved -= buf->len; | |
36e39c40 | 4694 | cache->space_info->reservation_progress++; |
f0486c68 YZ |
4695 | spin_unlock(&cache->space_info->lock); |
4696 | } | |
4697 | goto out; | |
4698 | } | |
4699 | pin: | |
4700 | if (block_rsv->durable && !cache->ro) { | |
4701 | ret = 0; | |
4702 | spin_lock(&cache->lock); | |
4703 | if (!cache->ro) { | |
4704 | cache->reserved_pinned += buf->len; | |
4705 | ret = 1; | |
4706 | } | |
4707 | spin_unlock(&cache->lock); | |
4708 | ||
4709 | if (ret) { | |
4710 | spin_lock(&block_rsv->lock); | |
4711 | block_rsv->freed[trans->transid & 0x1] += buf->len; | |
4712 | spin_unlock(&block_rsv->lock); | |
4713 | } | |
4714 | } | |
4715 | out: | |
a826d6dc JB |
4716 | /* |
4717 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
4718 | * anymore. | |
4719 | */ | |
4720 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
4721 | btrfs_put_block_group(cache); |
4722 | } | |
4723 | ||
925baedd | 4724 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4725 | struct btrfs_root *root, |
4726 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4727 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4728 | { |
4729 | int ret; | |
4730 | ||
56bec294 CM |
4731 | /* |
4732 | * tree log blocks never actually go into the extent allocation | |
4733 | * tree, just update pinning info and exit early. | |
56bec294 | 4734 | */ |
5d4f98a2 YZ |
4735 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4736 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4737 | /* unlocks the pinned mutex */ |
11833d66 | 4738 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4739 | ret = 0; |
5d4f98a2 YZ |
4740 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4741 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4742 | parent, root_objectid, (int)owner, | |
4743 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 4744 | BUG_ON(ret); |
5d4f98a2 YZ |
4745 | } else { |
4746 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4747 | parent, root_objectid, owner, | |
4748 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4749 | BUG_ON(ret); | |
56bec294 | 4750 | } |
925baedd CM |
4751 | return ret; |
4752 | } | |
4753 | ||
87ee04eb CM |
4754 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4755 | { | |
4756 | u64 mask = ((u64)root->stripesize - 1); | |
4757 | u64 ret = (val + mask) & ~mask; | |
4758 | return ret; | |
4759 | } | |
4760 | ||
817d52f8 JB |
4761 | /* |
4762 | * when we wait for progress in the block group caching, its because | |
4763 | * our allocation attempt failed at least once. So, we must sleep | |
4764 | * and let some progress happen before we try again. | |
4765 | * | |
4766 | * This function will sleep at least once waiting for new free space to | |
4767 | * show up, and then it will check the block group free space numbers | |
4768 | * for our min num_bytes. Another option is to have it go ahead | |
4769 | * and look in the rbtree for a free extent of a given size, but this | |
4770 | * is a good start. | |
4771 | */ | |
4772 | static noinline int | |
4773 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4774 | u64 num_bytes) | |
4775 | { | |
11833d66 | 4776 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4777 | DEFINE_WAIT(wait); |
4778 | ||
11833d66 YZ |
4779 | caching_ctl = get_caching_control(cache); |
4780 | if (!caching_ctl) | |
817d52f8 | 4781 | return 0; |
817d52f8 | 4782 | |
11833d66 | 4783 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 4784 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
4785 | |
4786 | put_caching_control(caching_ctl); | |
4787 | return 0; | |
4788 | } | |
4789 | ||
4790 | static noinline int | |
4791 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4792 | { | |
4793 | struct btrfs_caching_control *caching_ctl; | |
4794 | DEFINE_WAIT(wait); | |
4795 | ||
4796 | caching_ctl = get_caching_control(cache); | |
4797 | if (!caching_ctl) | |
4798 | return 0; | |
4799 | ||
4800 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4801 | ||
4802 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4803 | return 0; |
4804 | } | |
4805 | ||
b742bb82 YZ |
4806 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
4807 | { | |
4808 | int index; | |
4809 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
4810 | index = 0; | |
4811 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
4812 | index = 1; | |
4813 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
4814 | index = 2; | |
4815 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
4816 | index = 3; | |
4817 | else | |
4818 | index = 4; | |
4819 | return index; | |
4820 | } | |
4821 | ||
817d52f8 | 4822 | enum btrfs_loop_type { |
ccf0e725 | 4823 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
4824 | LOOP_CACHING_NOWAIT = 1, |
4825 | LOOP_CACHING_WAIT = 2, | |
4826 | LOOP_ALLOC_CHUNK = 3, | |
4827 | LOOP_NO_EMPTY_SIZE = 4, | |
4828 | }; | |
4829 | ||
fec577fb CM |
4830 | /* |
4831 | * walks the btree of allocated extents and find a hole of a given size. | |
4832 | * The key ins is changed to record the hole: | |
4833 | * ins->objectid == block start | |
62e2749e | 4834 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4835 | * ins->offset == number of blocks |
4836 | * Any available blocks before search_start are skipped. | |
4837 | */ | |
d397712b | 4838 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4839 | struct btrfs_root *orig_root, |
4840 | u64 num_bytes, u64 empty_size, | |
4841 | u64 search_start, u64 search_end, | |
4842 | u64 hint_byte, struct btrfs_key *ins, | |
98ed5174 | 4843 | int data) |
fec577fb | 4844 | { |
80eb234a | 4845 | int ret = 0; |
d397712b | 4846 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4847 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4848 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4849 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4850 | int allowed_chunk_alloc = 0; |
ccf0e725 | 4851 | int done_chunk_alloc = 0; |
80eb234a | 4852 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4853 | int last_ptr_loop = 0; |
4854 | int loop = 0; | |
f0486c68 | 4855 | int index = 0; |
817d52f8 | 4856 | bool found_uncached_bg = false; |
0a24325e | 4857 | bool failed_cluster_refill = false; |
1cdda9b8 | 4858 | bool failed_alloc = false; |
67377734 | 4859 | bool use_cluster = true; |
ccf0e725 JB |
4860 | u64 ideal_cache_percent = 0; |
4861 | u64 ideal_cache_offset = 0; | |
fec577fb | 4862 | |
db94535d | 4863 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4864 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4865 | ins->objectid = 0; |
4866 | ins->offset = 0; | |
b1a4d965 | 4867 | |
2552d17e | 4868 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 JB |
4869 | if (!space_info) { |
4870 | printk(KERN_ERR "No space info for %d\n", data); | |
4871 | return -ENOSPC; | |
4872 | } | |
2552d17e | 4873 | |
67377734 JB |
4874 | /* |
4875 | * If the space info is for both data and metadata it means we have a | |
4876 | * small filesystem and we can't use the clustering stuff. | |
4877 | */ | |
4878 | if (btrfs_mixed_space_info(space_info)) | |
4879 | use_cluster = false; | |
4880 | ||
0ef3e66b CM |
4881 | if (orig_root->ref_cows || empty_size) |
4882 | allowed_chunk_alloc = 1; | |
4883 | ||
67377734 | 4884 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 4885 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4886 | if (!btrfs_test_opt(root, SSD)) |
4887 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4888 | } |
4889 | ||
67377734 JB |
4890 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
4891 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
4892 | last_ptr = &root->fs_info->data_alloc_cluster; |
4893 | } | |
0f9dd46c | 4894 | |
239b14b3 | 4895 | if (last_ptr) { |
fa9c0d79 CM |
4896 | spin_lock(&last_ptr->lock); |
4897 | if (last_ptr->block_group) | |
4898 | hint_byte = last_ptr->window_start; | |
4899 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4900 | } |
fa9c0d79 | 4901 | |
a061fc8d | 4902 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4903 | search_start = max(search_start, hint_byte); |
0b86a832 | 4904 | |
817d52f8 | 4905 | if (!last_ptr) |
fa9c0d79 | 4906 | empty_cluster = 0; |
fa9c0d79 | 4907 | |
2552d17e | 4908 | if (search_start == hint_byte) { |
ccf0e725 | 4909 | ideal_cache: |
2552d17e JB |
4910 | block_group = btrfs_lookup_block_group(root->fs_info, |
4911 | search_start); | |
817d52f8 JB |
4912 | /* |
4913 | * we don't want to use the block group if it doesn't match our | |
4914 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
4915 | * |
4916 | * However if we are re-searching with an ideal block group | |
4917 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
4918 | */ |
4919 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
4920 | (block_group->cached != BTRFS_CACHE_NO || |
4921 | search_start == ideal_cache_offset)) { | |
2552d17e | 4922 | down_read(&space_info->groups_sem); |
44fb5511 CM |
4923 | if (list_empty(&block_group->list) || |
4924 | block_group->ro) { | |
4925 | /* | |
4926 | * someone is removing this block group, | |
4927 | * we can't jump into the have_block_group | |
4928 | * target because our list pointers are not | |
4929 | * valid | |
4930 | */ | |
4931 | btrfs_put_block_group(block_group); | |
4932 | up_read(&space_info->groups_sem); | |
ccf0e725 | 4933 | } else { |
b742bb82 | 4934 | index = get_block_group_index(block_group); |
44fb5511 | 4935 | goto have_block_group; |
ccf0e725 | 4936 | } |
2552d17e | 4937 | } else if (block_group) { |
fa9c0d79 | 4938 | btrfs_put_block_group(block_group); |
2552d17e | 4939 | } |
42e70e7a | 4940 | } |
2552d17e | 4941 | search: |
80eb234a | 4942 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
4943 | list_for_each_entry(block_group, &space_info->block_groups[index], |
4944 | list) { | |
6226cb0a | 4945 | u64 offset; |
817d52f8 | 4946 | int cached; |
8a1413a2 | 4947 | |
11dfe35a | 4948 | btrfs_get_block_group(block_group); |
2552d17e | 4949 | search_start = block_group->key.objectid; |
42e70e7a | 4950 | |
83a50de9 CM |
4951 | /* |
4952 | * this can happen if we end up cycling through all the | |
4953 | * raid types, but we want to make sure we only allocate | |
4954 | * for the proper type. | |
4955 | */ | |
4956 | if (!block_group_bits(block_group, data)) { | |
4957 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
4958 | BTRFS_BLOCK_GROUP_RAID1 | | |
4959 | BTRFS_BLOCK_GROUP_RAID10; | |
4960 | ||
4961 | /* | |
4962 | * if they asked for extra copies and this block group | |
4963 | * doesn't provide them, bail. This does allow us to | |
4964 | * fill raid0 from raid1. | |
4965 | */ | |
4966 | if ((data & extra) && !(block_group->flags & extra)) | |
4967 | goto loop; | |
4968 | } | |
4969 | ||
2552d17e | 4970 | have_block_group: |
817d52f8 | 4971 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
ccf0e725 JB |
4972 | u64 free_percent; |
4973 | ||
b8399dee JB |
4974 | ret = cache_block_group(block_group, trans, |
4975 | orig_root, 1); | |
9d66e233 JB |
4976 | if (block_group->cached == BTRFS_CACHE_FINISHED) |
4977 | goto have_block_group; | |
4978 | ||
ccf0e725 JB |
4979 | free_percent = btrfs_block_group_used(&block_group->item); |
4980 | free_percent *= 100; | |
4981 | free_percent = div64_u64(free_percent, | |
4982 | block_group->key.offset); | |
4983 | free_percent = 100 - free_percent; | |
4984 | if (free_percent > ideal_cache_percent && | |
4985 | likely(!block_group->ro)) { | |
4986 | ideal_cache_offset = block_group->key.objectid; | |
4987 | ideal_cache_percent = free_percent; | |
4988 | } | |
4989 | ||
817d52f8 | 4990 | /* |
ccf0e725 JB |
4991 | * We only want to start kthread caching if we are at |
4992 | * the point where we will wait for caching to make | |
4993 | * progress, or if our ideal search is over and we've | |
4994 | * found somebody to start caching. | |
817d52f8 JB |
4995 | */ |
4996 | if (loop > LOOP_CACHING_NOWAIT || | |
ccf0e725 JB |
4997 | (loop > LOOP_FIND_IDEAL && |
4998 | atomic_read(&space_info->caching_threads) < 2)) { | |
b8399dee JB |
4999 | ret = cache_block_group(block_group, trans, |
5000 | orig_root, 0); | |
817d52f8 | 5001 | BUG_ON(ret); |
2552d17e | 5002 | } |
817d52f8 JB |
5003 | found_uncached_bg = true; |
5004 | ||
ccf0e725 JB |
5005 | /* |
5006 | * If loop is set for cached only, try the next block | |
5007 | * group. | |
5008 | */ | |
5009 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
5010 | goto loop; |
5011 | } | |
5012 | ||
ccf0e725 JB |
5013 | cached = block_group_cache_done(block_group); |
5014 | if (unlikely(!cached)) | |
5015 | found_uncached_bg = true; | |
5016 | ||
ea6a478e | 5017 | if (unlikely(block_group->ro)) |
2552d17e | 5018 | goto loop; |
0f9dd46c | 5019 | |
ff5714cc | 5020 | spin_lock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5021 | if (cached && |
ff5714cc CM |
5022 | block_group->free_space_ctl->free_space < |
5023 | num_bytes + empty_size) { | |
5024 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
cca1c81f JB |
5025 | goto loop; |
5026 | } | |
ff5714cc | 5027 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5028 | |
0a24325e JB |
5029 | /* |
5030 | * Ok we want to try and use the cluster allocator, so lets look | |
5031 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
5032 | * have tried the cluster allocator plenty of times at this | |
5033 | * point and not have found anything, so we are likely way too | |
5034 | * fragmented for the clustering stuff to find anything, so lets | |
5035 | * just skip it and let the allocator find whatever block it can | |
5036 | * find | |
5037 | */ | |
5038 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
5039 | /* |
5040 | * the refill lock keeps out other | |
5041 | * people trying to start a new cluster | |
5042 | */ | |
5043 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
5044 | if (last_ptr->block_group && |
5045 | (last_ptr->block_group->ro || | |
5046 | !block_group_bits(last_ptr->block_group, data))) { | |
5047 | offset = 0; | |
5048 | goto refill_cluster; | |
5049 | } | |
5050 | ||
fa9c0d79 CM |
5051 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
5052 | num_bytes, search_start); | |
5053 | if (offset) { | |
5054 | /* we have a block, we're done */ | |
5055 | spin_unlock(&last_ptr->refill_lock); | |
5056 | goto checks; | |
5057 | } | |
5058 | ||
5059 | spin_lock(&last_ptr->lock); | |
5060 | /* | |
5061 | * whoops, this cluster doesn't actually point to | |
5062 | * this block group. Get a ref on the block | |
5063 | * group is does point to and try again | |
5064 | */ | |
5065 | if (!last_ptr_loop && last_ptr->block_group && | |
5066 | last_ptr->block_group != block_group) { | |
5067 | ||
5068 | btrfs_put_block_group(block_group); | |
5069 | block_group = last_ptr->block_group; | |
11dfe35a | 5070 | btrfs_get_block_group(block_group); |
fa9c0d79 CM |
5071 | spin_unlock(&last_ptr->lock); |
5072 | spin_unlock(&last_ptr->refill_lock); | |
5073 | ||
5074 | last_ptr_loop = 1; | |
5075 | search_start = block_group->key.objectid; | |
44fb5511 CM |
5076 | /* |
5077 | * we know this block group is properly | |
5078 | * in the list because | |
5079 | * btrfs_remove_block_group, drops the | |
5080 | * cluster before it removes the block | |
5081 | * group from the list | |
5082 | */ | |
fa9c0d79 CM |
5083 | goto have_block_group; |
5084 | } | |
5085 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 5086 | refill_cluster: |
fa9c0d79 CM |
5087 | /* |
5088 | * this cluster didn't work out, free it and | |
5089 | * start over | |
5090 | */ | |
5091 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5092 | ||
5093 | last_ptr_loop = 0; | |
5094 | ||
5095 | /* allocate a cluster in this block group */ | |
451d7585 | 5096 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
5097 | block_group, last_ptr, |
5098 | offset, num_bytes, | |
5099 | empty_cluster + empty_size); | |
5100 | if (ret == 0) { | |
5101 | /* | |
5102 | * now pull our allocation out of this | |
5103 | * cluster | |
5104 | */ | |
5105 | offset = btrfs_alloc_from_cluster(block_group, | |
5106 | last_ptr, num_bytes, | |
5107 | search_start); | |
5108 | if (offset) { | |
5109 | /* we found one, proceed */ | |
5110 | spin_unlock(&last_ptr->refill_lock); | |
5111 | goto checks; | |
5112 | } | |
0a24325e JB |
5113 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5114 | && !failed_cluster_refill) { | |
817d52f8 JB |
5115 | spin_unlock(&last_ptr->refill_lock); |
5116 | ||
0a24325e | 5117 | failed_cluster_refill = true; |
817d52f8 JB |
5118 | wait_block_group_cache_progress(block_group, |
5119 | num_bytes + empty_cluster + empty_size); | |
5120 | goto have_block_group; | |
fa9c0d79 | 5121 | } |
817d52f8 | 5122 | |
fa9c0d79 CM |
5123 | /* |
5124 | * at this point we either didn't find a cluster | |
5125 | * or we weren't able to allocate a block from our | |
5126 | * cluster. Free the cluster we've been trying | |
5127 | * to use, and go to the next block group | |
5128 | */ | |
0a24325e | 5129 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5130 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5131 | goto loop; |
fa9c0d79 CM |
5132 | } |
5133 | ||
6226cb0a JB |
5134 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5135 | num_bytes, empty_size); | |
1cdda9b8 JB |
5136 | /* |
5137 | * If we didn't find a chunk, and we haven't failed on this | |
5138 | * block group before, and this block group is in the middle of | |
5139 | * caching and we are ok with waiting, then go ahead and wait | |
5140 | * for progress to be made, and set failed_alloc to true. | |
5141 | * | |
5142 | * If failed_alloc is true then we've already waited on this | |
5143 | * block group once and should move on to the next block group. | |
5144 | */ | |
5145 | if (!offset && !failed_alloc && !cached && | |
5146 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5147 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5148 | num_bytes + empty_size); |
5149 | failed_alloc = true; | |
817d52f8 | 5150 | goto have_block_group; |
1cdda9b8 JB |
5151 | } else if (!offset) { |
5152 | goto loop; | |
817d52f8 | 5153 | } |
fa9c0d79 | 5154 | checks: |
6226cb0a | 5155 | search_start = stripe_align(root, offset); |
2552d17e | 5156 | /* move on to the next group */ |
6226cb0a JB |
5157 | if (search_start + num_bytes >= search_end) { |
5158 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5159 | goto loop; |
6226cb0a | 5160 | } |
25179201 | 5161 | |
2552d17e JB |
5162 | /* move on to the next group */ |
5163 | if (search_start + num_bytes > | |
6226cb0a JB |
5164 | block_group->key.objectid + block_group->key.offset) { |
5165 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5166 | goto loop; |
6226cb0a | 5167 | } |
f5a31e16 | 5168 | |
f0486c68 YZ |
5169 | ins->objectid = search_start; |
5170 | ins->offset = num_bytes; | |
2552d17e | 5171 | |
f0486c68 YZ |
5172 | if (offset < search_start) |
5173 | btrfs_add_free_space(block_group, offset, | |
5174 | search_start - offset); | |
5175 | BUG_ON(offset > search_start); | |
2552d17e | 5176 | |
b4d00d56 | 5177 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, 1, |
f0486c68 YZ |
5178 | (data & BTRFS_BLOCK_GROUP_DATA)); |
5179 | if (ret == -EAGAIN) { | |
6226cb0a | 5180 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 5181 | goto loop; |
0f9dd46c | 5182 | } |
0b86a832 | 5183 | |
f0486c68 | 5184 | /* we are all good, lets return */ |
2552d17e JB |
5185 | ins->objectid = search_start; |
5186 | ins->offset = num_bytes; | |
d2fb3437 | 5187 | |
6226cb0a JB |
5188 | if (offset < search_start) |
5189 | btrfs_add_free_space(block_group, offset, | |
5190 | search_start - offset); | |
5191 | BUG_ON(offset > search_start); | |
d82a6f1d | 5192 | btrfs_put_block_group(block_group); |
2552d17e JB |
5193 | break; |
5194 | loop: | |
0a24325e | 5195 | failed_cluster_refill = false; |
1cdda9b8 | 5196 | failed_alloc = false; |
b742bb82 | 5197 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 5198 | btrfs_put_block_group(block_group); |
2552d17e JB |
5199 | } |
5200 | up_read(&space_info->groups_sem); | |
5201 | ||
b742bb82 YZ |
5202 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5203 | goto search; | |
5204 | ||
ccf0e725 JB |
5205 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
5206 | * for them to make caching progress. Also | |
5207 | * determine the best possible bg to cache | |
5208 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
5209 | * caching kthreads as we move along | |
817d52f8 JB |
5210 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5211 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5212 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5213 | * again | |
fa9c0d79 | 5214 | */ |
817d52f8 JB |
5215 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE && |
5216 | (found_uncached_bg || empty_size || empty_cluster || | |
5217 | allowed_chunk_alloc)) { | |
b742bb82 | 5218 | index = 0; |
ccf0e725 | 5219 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 5220 | found_uncached_bg = false; |
ccf0e725 JB |
5221 | loop++; |
5222 | if (!ideal_cache_percent && | |
5223 | atomic_read(&space_info->caching_threads)) | |
817d52f8 | 5224 | goto search; |
ccf0e725 JB |
5225 | |
5226 | /* | |
5227 | * 1 of the following 2 things have happened so far | |
5228 | * | |
5229 | * 1) We found an ideal block group for caching that | |
5230 | * is mostly full and will cache quickly, so we might | |
5231 | * as well wait for it. | |
5232 | * | |
5233 | * 2) We searched for cached only and we didn't find | |
5234 | * anything, and we didn't start any caching kthreads | |
5235 | * either, so chances are we will loop through and | |
5236 | * start a couple caching kthreads, and then come back | |
5237 | * around and just wait for them. This will be slower | |
5238 | * because we will have 2 caching kthreads reading at | |
5239 | * the same time when we could have just started one | |
5240 | * and waited for it to get far enough to give us an | |
5241 | * allocation, so go ahead and go to the wait caching | |
5242 | * loop. | |
5243 | */ | |
5244 | loop = LOOP_CACHING_WAIT; | |
5245 | search_start = ideal_cache_offset; | |
5246 | ideal_cache_percent = 0; | |
5247 | goto ideal_cache; | |
5248 | } else if (loop == LOOP_FIND_IDEAL) { | |
5249 | /* | |
5250 | * Didn't find a uncached bg, wait on anything we find | |
5251 | * next. | |
5252 | */ | |
5253 | loop = LOOP_CACHING_WAIT; | |
5254 | goto search; | |
5255 | } | |
5256 | ||
5257 | if (loop < LOOP_CACHING_WAIT) { | |
5258 | loop++; | |
5259 | goto search; | |
817d52f8 JB |
5260 | } |
5261 | ||
5262 | if (loop == LOOP_ALLOC_CHUNK) { | |
fa9c0d79 CM |
5263 | empty_size = 0; |
5264 | empty_cluster = 0; | |
5265 | } | |
2552d17e JB |
5266 | |
5267 | if (allowed_chunk_alloc) { | |
5268 | ret = do_chunk_alloc(trans, root, num_bytes + | |
0e4f8f88 CM |
5269 | 2 * 1024 * 1024, data, |
5270 | CHUNK_ALLOC_LIMITED); | |
2552d17e | 5271 | allowed_chunk_alloc = 0; |
ccf0e725 | 5272 | done_chunk_alloc = 1; |
0e4f8f88 CM |
5273 | } else if (!done_chunk_alloc && |
5274 | space_info->force_alloc == CHUNK_ALLOC_NO_FORCE) { | |
5275 | space_info->force_alloc = CHUNK_ALLOC_LIMITED; | |
2552d17e JB |
5276 | } |
5277 | ||
817d52f8 | 5278 | if (loop < LOOP_NO_EMPTY_SIZE) { |
fa9c0d79 | 5279 | loop++; |
2552d17e | 5280 | goto search; |
fa9c0d79 | 5281 | } |
2552d17e JB |
5282 | ret = -ENOSPC; |
5283 | } else if (!ins->objectid) { | |
5284 | ret = -ENOSPC; | |
d82a6f1d | 5285 | } else if (ins->objectid) { |
80eb234a | 5286 | ret = 0; |
be744175 | 5287 | } |
be744175 | 5288 | |
0f70abe2 | 5289 | return ret; |
fec577fb | 5290 | } |
ec44a35c | 5291 | |
9ed74f2d JB |
5292 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
5293 | int dump_block_groups) | |
0f9dd46c JB |
5294 | { |
5295 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 5296 | int index = 0; |
0f9dd46c | 5297 | |
9ed74f2d | 5298 | spin_lock(&info->lock); |
d397712b CM |
5299 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
5300 | (unsigned long long)(info->total_bytes - info->bytes_used - | |
9ed74f2d | 5301 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 5302 | info->bytes_readonly), |
d397712b | 5303 | (info->full) ? "" : "not "); |
8929ecfa YZ |
5304 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
5305 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 5306 | (unsigned long long)info->total_bytes, |
8929ecfa | 5307 | (unsigned long long)info->bytes_used, |
21380931 | 5308 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 5309 | (unsigned long long)info->bytes_reserved, |
21380931 | 5310 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 5311 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
5312 | spin_unlock(&info->lock); |
5313 | ||
5314 | if (!dump_block_groups) | |
5315 | return; | |
0f9dd46c | 5316 | |
80eb234a | 5317 | down_read(&info->groups_sem); |
b742bb82 YZ |
5318 | again: |
5319 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 5320 | spin_lock(&cache->lock); |
d397712b CM |
5321 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
5322 | "%llu pinned %llu reserved\n", | |
5323 | (unsigned long long)cache->key.objectid, | |
5324 | (unsigned long long)cache->key.offset, | |
5325 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
5326 | (unsigned long long)cache->pinned, | |
5327 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
5328 | btrfs_dump_free_space(cache, bytes); |
5329 | spin_unlock(&cache->lock); | |
5330 | } | |
b742bb82 YZ |
5331 | if (++index < BTRFS_NR_RAID_TYPES) |
5332 | goto again; | |
80eb234a | 5333 | up_read(&info->groups_sem); |
0f9dd46c | 5334 | } |
e8569813 | 5335 | |
11833d66 YZ |
5336 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
5337 | struct btrfs_root *root, | |
5338 | u64 num_bytes, u64 min_alloc_size, | |
5339 | u64 empty_size, u64 hint_byte, | |
5340 | u64 search_end, struct btrfs_key *ins, | |
5341 | u64 data) | |
fec577fb CM |
5342 | { |
5343 | int ret; | |
fbdc762b | 5344 | u64 search_start = 0; |
925baedd | 5345 | |
6a63209f | 5346 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 5347 | again: |
0ef3e66b CM |
5348 | /* |
5349 | * the only place that sets empty_size is btrfs_realloc_node, which | |
5350 | * is not called recursively on allocations | |
5351 | */ | |
83d3c969 | 5352 | if (empty_size || root->ref_cows) |
6324fbf3 | 5353 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
5354 | num_bytes + 2 * 1024 * 1024, data, |
5355 | CHUNK_ALLOC_NO_FORCE); | |
0b86a832 | 5356 | |
db94535d CM |
5357 | WARN_ON(num_bytes < root->sectorsize); |
5358 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
5359 | search_start, search_end, hint_byte, |
5360 | ins, data); | |
3b951516 | 5361 | |
98d20f67 CM |
5362 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
5363 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 5364 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 5365 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b | 5366 | do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 | 5367 | num_bytes, data, CHUNK_ALLOC_FORCE); |
98d20f67 CM |
5368 | goto again; |
5369 | } | |
91435650 | 5370 | if (ret == -ENOSPC && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
0f9dd46c JB |
5371 | struct btrfs_space_info *sinfo; |
5372 | ||
5373 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5374 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5375 | "wanted %llu\n", (unsigned long long)data, | |
5376 | (unsigned long long)num_bytes); | |
9ed74f2d | 5377 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5378 | } |
0f9dd46c | 5379 | |
1abe9b8a | 5380 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
5381 | ||
0f9dd46c | 5382 | return ret; |
e6dcd2dc CM |
5383 | } |
5384 | ||
65b51a00 CM |
5385 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
5386 | { | |
0f9dd46c | 5387 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5388 | int ret = 0; |
0f9dd46c | 5389 | |
0f9dd46c JB |
5390 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5391 | if (!cache) { | |
d397712b CM |
5392 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5393 | (unsigned long long)start); | |
0f9dd46c JB |
5394 | return -ENOSPC; |
5395 | } | |
1f3c79a2 | 5396 | |
5378e607 LD |
5397 | if (btrfs_test_opt(root, DISCARD)) |
5398 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 5399 | |
0f9dd46c | 5400 | btrfs_add_free_space(cache, start, len); |
b4d00d56 | 5401 | btrfs_update_reserved_bytes(cache, len, 0, 1); |
fa9c0d79 | 5402 | btrfs_put_block_group(cache); |
817d52f8 | 5403 | |
1abe9b8a | 5404 | trace_btrfs_reserved_extent_free(root, start, len); |
5405 | ||
e6dcd2dc CM |
5406 | return ret; |
5407 | } | |
5408 | ||
5d4f98a2 YZ |
5409 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5410 | struct btrfs_root *root, | |
5411 | u64 parent, u64 root_objectid, | |
5412 | u64 flags, u64 owner, u64 offset, | |
5413 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5414 | { |
5415 | int ret; | |
5d4f98a2 | 5416 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5417 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5418 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5419 | struct btrfs_path *path; |
5d4f98a2 YZ |
5420 | struct extent_buffer *leaf; |
5421 | int type; | |
5422 | u32 size; | |
26b8003f | 5423 | |
5d4f98a2 YZ |
5424 | if (parent > 0) |
5425 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5426 | else | |
5427 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5428 | |
5d4f98a2 | 5429 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5430 | |
5431 | path = btrfs_alloc_path(); | |
db5b493a TI |
5432 | if (!path) |
5433 | return -ENOMEM; | |
47e4bb98 | 5434 | |
b9473439 | 5435 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5436 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5437 | ins, size); | |
ccd467d6 | 5438 | BUG_ON(ret); |
0f9dd46c | 5439 | |
5d4f98a2 YZ |
5440 | leaf = path->nodes[0]; |
5441 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5442 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5443 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5444 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5445 | btrfs_set_extent_flags(leaf, extent_item, | |
5446 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5447 | ||
5448 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5449 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5450 | if (parent > 0) { | |
5451 | struct btrfs_shared_data_ref *ref; | |
5452 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5453 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5454 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5455 | } else { | |
5456 | struct btrfs_extent_data_ref *ref; | |
5457 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5458 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5459 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5460 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5461 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5462 | } | |
47e4bb98 CM |
5463 | |
5464 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5465 | btrfs_free_path(path); |
f510cfec | 5466 | |
f0486c68 | 5467 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5468 | if (ret) { |
d397712b CM |
5469 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5470 | "%llu\n", (unsigned long long)ins->objectid, | |
5471 | (unsigned long long)ins->offset); | |
f5947066 CM |
5472 | BUG(); |
5473 | } | |
e6dcd2dc CM |
5474 | return ret; |
5475 | } | |
5476 | ||
5d4f98a2 YZ |
5477 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5478 | struct btrfs_root *root, | |
5479 | u64 parent, u64 root_objectid, | |
5480 | u64 flags, struct btrfs_disk_key *key, | |
5481 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5482 | { |
5483 | int ret; | |
5d4f98a2 YZ |
5484 | struct btrfs_fs_info *fs_info = root->fs_info; |
5485 | struct btrfs_extent_item *extent_item; | |
5486 | struct btrfs_tree_block_info *block_info; | |
5487 | struct btrfs_extent_inline_ref *iref; | |
5488 | struct btrfs_path *path; | |
5489 | struct extent_buffer *leaf; | |
5490 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5491 | |
5d4f98a2 YZ |
5492 | path = btrfs_alloc_path(); |
5493 | BUG_ON(!path); | |
56bec294 | 5494 | |
5d4f98a2 YZ |
5495 | path->leave_spinning = 1; |
5496 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5497 | ins, size); | |
56bec294 | 5498 | BUG_ON(ret); |
5d4f98a2 YZ |
5499 | |
5500 | leaf = path->nodes[0]; | |
5501 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5502 | struct btrfs_extent_item); | |
5503 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5504 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5505 | btrfs_set_extent_flags(leaf, extent_item, | |
5506 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5507 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5508 | ||
5509 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5510 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5511 | ||
5512 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5513 | if (parent > 0) { | |
5514 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5515 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5516 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5517 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5518 | } else { | |
5519 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5520 | BTRFS_TREE_BLOCK_REF_KEY); | |
5521 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5522 | } | |
5523 | ||
5524 | btrfs_mark_buffer_dirty(leaf); | |
5525 | btrfs_free_path(path); | |
5526 | ||
f0486c68 | 5527 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5528 | if (ret) { |
5529 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5530 | "%llu\n", (unsigned long long)ins->objectid, | |
5531 | (unsigned long long)ins->offset); | |
5532 | BUG(); | |
5533 | } | |
5534 | return ret; | |
5535 | } | |
5536 | ||
5537 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5538 | struct btrfs_root *root, | |
5539 | u64 root_objectid, u64 owner, | |
5540 | u64 offset, struct btrfs_key *ins) | |
5541 | { | |
5542 | int ret; | |
5543 | ||
5544 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5545 | ||
5546 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5547 | 0, root_objectid, owner, offset, | |
5548 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5549 | return ret; |
5550 | } | |
e02119d5 CM |
5551 | |
5552 | /* | |
5553 | * this is used by the tree logging recovery code. It records that | |
5554 | * an extent has been allocated and makes sure to clear the free | |
5555 | * space cache bits as well | |
5556 | */ | |
5d4f98a2 YZ |
5557 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5558 | struct btrfs_root *root, | |
5559 | u64 root_objectid, u64 owner, u64 offset, | |
5560 | struct btrfs_key *ins) | |
e02119d5 CM |
5561 | { |
5562 | int ret; | |
5563 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5564 | struct btrfs_caching_control *caching_ctl; |
5565 | u64 start = ins->objectid; | |
5566 | u64 num_bytes = ins->offset; | |
e02119d5 | 5567 | |
e02119d5 | 5568 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
b8399dee | 5569 | cache_block_group(block_group, trans, NULL, 0); |
11833d66 | 5570 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5571 | |
11833d66 YZ |
5572 | if (!caching_ctl) { |
5573 | BUG_ON(!block_group_cache_done(block_group)); | |
5574 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5575 | BUG_ON(ret); | |
5576 | } else { | |
5577 | mutex_lock(&caching_ctl->mutex); | |
5578 | ||
5579 | if (start >= caching_ctl->progress) { | |
5580 | ret = add_excluded_extent(root, start, num_bytes); | |
5581 | BUG_ON(ret); | |
5582 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5583 | ret = btrfs_remove_free_space(block_group, | |
5584 | start, num_bytes); | |
5585 | BUG_ON(ret); | |
5586 | } else { | |
5587 | num_bytes = caching_ctl->progress - start; | |
5588 | ret = btrfs_remove_free_space(block_group, | |
5589 | start, num_bytes); | |
5590 | BUG_ON(ret); | |
5591 | ||
5592 | start = caching_ctl->progress; | |
5593 | num_bytes = ins->objectid + ins->offset - | |
5594 | caching_ctl->progress; | |
5595 | ret = add_excluded_extent(root, start, num_bytes); | |
5596 | BUG_ON(ret); | |
5597 | } | |
5598 | ||
5599 | mutex_unlock(&caching_ctl->mutex); | |
5600 | put_caching_control(caching_ctl); | |
5601 | } | |
5602 | ||
b4d00d56 | 5603 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, 1, 1); |
f0486c68 | 5604 | BUG_ON(ret); |
fa9c0d79 | 5605 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5606 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5607 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5608 | return ret; |
5609 | } | |
5610 | ||
65b51a00 CM |
5611 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5612 | struct btrfs_root *root, | |
4008c04a CM |
5613 | u64 bytenr, u32 blocksize, |
5614 | int level) | |
65b51a00 CM |
5615 | { |
5616 | struct extent_buffer *buf; | |
5617 | ||
5618 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5619 | if (!buf) | |
5620 | return ERR_PTR(-ENOMEM); | |
5621 | btrfs_set_header_generation(buf, trans->transid); | |
4008c04a | 5622 | btrfs_set_buffer_lockdep_class(buf, level); |
65b51a00 CM |
5623 | btrfs_tree_lock(buf); |
5624 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5625 | |
5626 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5627 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5628 | |
d0c803c4 | 5629 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5630 | /* |
5631 | * we allow two log transactions at a time, use different | |
5632 | * EXENT bit to differentiate dirty pages. | |
5633 | */ | |
5634 | if (root->log_transid % 2 == 0) | |
5635 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5636 | buf->start + buf->len - 1, GFP_NOFS); | |
5637 | else | |
5638 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5639 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5640 | } else { |
5641 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5642 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5643 | } |
65b51a00 | 5644 | trans->blocks_used++; |
b4ce94de | 5645 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5646 | return buf; |
5647 | } | |
5648 | ||
f0486c68 YZ |
5649 | static struct btrfs_block_rsv * |
5650 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5651 | struct btrfs_root *root, u32 blocksize) | |
5652 | { | |
5653 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 5654 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
5655 | int ret; |
5656 | ||
5657 | block_rsv = get_block_rsv(trans, root); | |
5658 | ||
5659 | if (block_rsv->size == 0) { | |
8bb8ab2e JB |
5660 | ret = reserve_metadata_bytes(trans, root, block_rsv, |
5661 | blocksize, 0); | |
68a82277 JB |
5662 | /* |
5663 | * If we couldn't reserve metadata bytes try and use some from | |
5664 | * the global reserve. | |
5665 | */ | |
5666 | if (ret && block_rsv != global_rsv) { | |
5667 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5668 | if (!ret) | |
5669 | return global_rsv; | |
f0486c68 | 5670 | return ERR_PTR(ret); |
68a82277 | 5671 | } else if (ret) { |
f0486c68 | 5672 | return ERR_PTR(ret); |
68a82277 | 5673 | } |
f0486c68 YZ |
5674 | return block_rsv; |
5675 | } | |
5676 | ||
5677 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5678 | if (!ret) | |
5679 | return block_rsv; | |
68a82277 JB |
5680 | if (ret) { |
5681 | WARN_ON(1); | |
5682 | ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize, | |
5683 | 0); | |
5684 | if (!ret) { | |
5685 | spin_lock(&block_rsv->lock); | |
5686 | block_rsv->size += blocksize; | |
5687 | spin_unlock(&block_rsv->lock); | |
5688 | return block_rsv; | |
5689 | } else if (ret && block_rsv != global_rsv) { | |
5690 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5691 | if (!ret) | |
5692 | return global_rsv; | |
5693 | } | |
5694 | } | |
f0486c68 | 5695 | |
f0486c68 YZ |
5696 | return ERR_PTR(-ENOSPC); |
5697 | } | |
5698 | ||
5699 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
5700 | { | |
5701 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
5702 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
5703 | } | |
5704 | ||
fec577fb | 5705 | /* |
f0486c68 YZ |
5706 | * finds a free extent and does all the dirty work required for allocation |
5707 | * returns the key for the extent through ins, and a tree buffer for | |
5708 | * the first block of the extent through buf. | |
5709 | * | |
fec577fb CM |
5710 | * returns the tree buffer or NULL. |
5711 | */ | |
5f39d397 | 5712 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
5713 | struct btrfs_root *root, u32 blocksize, |
5714 | u64 parent, u64 root_objectid, | |
5715 | struct btrfs_disk_key *key, int level, | |
5716 | u64 hint, u64 empty_size) | |
fec577fb | 5717 | { |
e2fa7227 | 5718 | struct btrfs_key ins; |
f0486c68 | 5719 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 5720 | struct extent_buffer *buf; |
f0486c68 YZ |
5721 | u64 flags = 0; |
5722 | int ret; | |
5723 | ||
fec577fb | 5724 | |
f0486c68 YZ |
5725 | block_rsv = use_block_rsv(trans, root, blocksize); |
5726 | if (IS_ERR(block_rsv)) | |
5727 | return ERR_CAST(block_rsv); | |
5728 | ||
5729 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
5730 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 5731 | if (ret) { |
f0486c68 | 5732 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 5733 | return ERR_PTR(ret); |
fec577fb | 5734 | } |
55c69072 | 5735 | |
4008c04a CM |
5736 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
5737 | blocksize, level); | |
f0486c68 YZ |
5738 | BUG_ON(IS_ERR(buf)); |
5739 | ||
5740 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
5741 | if (parent == 0) | |
5742 | parent = ins.objectid; | |
5743 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5744 | } else | |
5745 | BUG_ON(parent > 0); | |
5746 | ||
5747 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5748 | struct btrfs_delayed_extent_op *extent_op; | |
5749 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
5750 | BUG_ON(!extent_op); | |
5751 | if (key) | |
5752 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
5753 | else | |
5754 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
5755 | extent_op->flags_to_set = flags; | |
5756 | extent_op->update_key = 1; | |
5757 | extent_op->update_flags = 1; | |
5758 | extent_op->is_data = 0; | |
5759 | ||
5760 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
5761 | ins.offset, parent, root_objectid, | |
5762 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5763 | extent_op); | |
5764 | BUG_ON(ret); | |
5765 | } | |
fec577fb CM |
5766 | return buf; |
5767 | } | |
a28ec197 | 5768 | |
2c47e605 YZ |
5769 | struct walk_control { |
5770 | u64 refs[BTRFS_MAX_LEVEL]; | |
5771 | u64 flags[BTRFS_MAX_LEVEL]; | |
5772 | struct btrfs_key update_progress; | |
5773 | int stage; | |
5774 | int level; | |
5775 | int shared_level; | |
5776 | int update_ref; | |
5777 | int keep_locks; | |
1c4850e2 YZ |
5778 | int reada_slot; |
5779 | int reada_count; | |
2c47e605 YZ |
5780 | }; |
5781 | ||
5782 | #define DROP_REFERENCE 1 | |
5783 | #define UPDATE_BACKREF 2 | |
5784 | ||
1c4850e2 YZ |
5785 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
5786 | struct btrfs_root *root, | |
5787 | struct walk_control *wc, | |
5788 | struct btrfs_path *path) | |
6407bf6d | 5789 | { |
1c4850e2 YZ |
5790 | u64 bytenr; |
5791 | u64 generation; | |
5792 | u64 refs; | |
94fcca9f | 5793 | u64 flags; |
5d4f98a2 | 5794 | u32 nritems; |
1c4850e2 YZ |
5795 | u32 blocksize; |
5796 | struct btrfs_key key; | |
5797 | struct extent_buffer *eb; | |
6407bf6d | 5798 | int ret; |
1c4850e2 YZ |
5799 | int slot; |
5800 | int nread = 0; | |
6407bf6d | 5801 | |
1c4850e2 YZ |
5802 | if (path->slots[wc->level] < wc->reada_slot) { |
5803 | wc->reada_count = wc->reada_count * 2 / 3; | |
5804 | wc->reada_count = max(wc->reada_count, 2); | |
5805 | } else { | |
5806 | wc->reada_count = wc->reada_count * 3 / 2; | |
5807 | wc->reada_count = min_t(int, wc->reada_count, | |
5808 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
5809 | } | |
7bb86316 | 5810 | |
1c4850e2 YZ |
5811 | eb = path->nodes[wc->level]; |
5812 | nritems = btrfs_header_nritems(eb); | |
5813 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 5814 | |
1c4850e2 YZ |
5815 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
5816 | if (nread >= wc->reada_count) | |
5817 | break; | |
bd56b302 | 5818 | |
2dd3e67b | 5819 | cond_resched(); |
1c4850e2 YZ |
5820 | bytenr = btrfs_node_blockptr(eb, slot); |
5821 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 5822 | |
1c4850e2 YZ |
5823 | if (slot == path->slots[wc->level]) |
5824 | goto reada; | |
5d4f98a2 | 5825 | |
1c4850e2 YZ |
5826 | if (wc->stage == UPDATE_BACKREF && |
5827 | generation <= root->root_key.offset) | |
bd56b302 CM |
5828 | continue; |
5829 | ||
94fcca9f YZ |
5830 | /* We don't lock the tree block, it's OK to be racy here */ |
5831 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
5832 | &refs, &flags); | |
5833 | BUG_ON(ret); | |
5834 | BUG_ON(refs == 0); | |
5835 | ||
1c4850e2 | 5836 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
5837 | if (refs == 1) |
5838 | goto reada; | |
bd56b302 | 5839 | |
94fcca9f YZ |
5840 | if (wc->level == 1 && |
5841 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5842 | continue; | |
1c4850e2 YZ |
5843 | if (!wc->update_ref || |
5844 | generation <= root->root_key.offset) | |
5845 | continue; | |
5846 | btrfs_node_key_to_cpu(eb, &key, slot); | |
5847 | ret = btrfs_comp_cpu_keys(&key, | |
5848 | &wc->update_progress); | |
5849 | if (ret < 0) | |
5850 | continue; | |
94fcca9f YZ |
5851 | } else { |
5852 | if (wc->level == 1 && | |
5853 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5854 | continue; | |
6407bf6d | 5855 | } |
1c4850e2 YZ |
5856 | reada: |
5857 | ret = readahead_tree_block(root, bytenr, blocksize, | |
5858 | generation); | |
5859 | if (ret) | |
bd56b302 | 5860 | break; |
1c4850e2 | 5861 | nread++; |
20524f02 | 5862 | } |
1c4850e2 | 5863 | wc->reada_slot = slot; |
20524f02 | 5864 | } |
2c47e605 | 5865 | |
f82d02d9 | 5866 | /* |
2c47e605 YZ |
5867 | * hepler to process tree block while walking down the tree. |
5868 | * | |
2c47e605 YZ |
5869 | * when wc->stage == UPDATE_BACKREF, this function updates |
5870 | * back refs for pointers in the block. | |
5871 | * | |
5872 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5873 | */ |
2c47e605 | 5874 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5875 | struct btrfs_root *root, |
2c47e605 | 5876 | struct btrfs_path *path, |
94fcca9f | 5877 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5878 | { |
2c47e605 YZ |
5879 | int level = wc->level; |
5880 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5881 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5882 | int ret; |
5883 | ||
2c47e605 YZ |
5884 | if (wc->stage == UPDATE_BACKREF && |
5885 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5886 | return 1; | |
f82d02d9 | 5887 | |
2c47e605 YZ |
5888 | /* |
5889 | * when reference count of tree block is 1, it won't increase | |
5890 | * again. once full backref flag is set, we never clear it. | |
5891 | */ | |
94fcca9f YZ |
5892 | if (lookup_info && |
5893 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5894 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5895 | BUG_ON(!path->locks[level]); |
5896 | ret = btrfs_lookup_extent_info(trans, root, | |
5897 | eb->start, eb->len, | |
5898 | &wc->refs[level], | |
5899 | &wc->flags[level]); | |
5900 | BUG_ON(ret); | |
5901 | BUG_ON(wc->refs[level] == 0); | |
5902 | } | |
5d4f98a2 | 5903 | |
2c47e605 YZ |
5904 | if (wc->stage == DROP_REFERENCE) { |
5905 | if (wc->refs[level] > 1) | |
5906 | return 1; | |
f82d02d9 | 5907 | |
2c47e605 YZ |
5908 | if (path->locks[level] && !wc->keep_locks) { |
5909 | btrfs_tree_unlock(eb); | |
5910 | path->locks[level] = 0; | |
5911 | } | |
5912 | return 0; | |
5913 | } | |
f82d02d9 | 5914 | |
2c47e605 YZ |
5915 | /* wc->stage == UPDATE_BACKREF */ |
5916 | if (!(wc->flags[level] & flag)) { | |
5917 | BUG_ON(!path->locks[level]); | |
5918 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5919 | BUG_ON(ret); |
2c47e605 YZ |
5920 | ret = btrfs_dec_ref(trans, root, eb, 0); |
5921 | BUG_ON(ret); | |
5922 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
5923 | eb->len, flag, 0); | |
5924 | BUG_ON(ret); | |
5925 | wc->flags[level] |= flag; | |
5926 | } | |
5927 | ||
5928 | /* | |
5929 | * the block is shared by multiple trees, so it's not good to | |
5930 | * keep the tree lock | |
5931 | */ | |
5932 | if (path->locks[level] && level > 0) { | |
5933 | btrfs_tree_unlock(eb); | |
5934 | path->locks[level] = 0; | |
5935 | } | |
5936 | return 0; | |
5937 | } | |
5938 | ||
1c4850e2 YZ |
5939 | /* |
5940 | * hepler to process tree block pointer. | |
5941 | * | |
5942 | * when wc->stage == DROP_REFERENCE, this function checks | |
5943 | * reference count of the block pointed to. if the block | |
5944 | * is shared and we need update back refs for the subtree | |
5945 | * rooted at the block, this function changes wc->stage to | |
5946 | * UPDATE_BACKREF. if the block is shared and there is no | |
5947 | * need to update back, this function drops the reference | |
5948 | * to the block. | |
5949 | * | |
5950 | * NOTE: return value 1 means we should stop walking down. | |
5951 | */ | |
5952 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
5953 | struct btrfs_root *root, | |
5954 | struct btrfs_path *path, | |
94fcca9f | 5955 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
5956 | { |
5957 | u64 bytenr; | |
5958 | u64 generation; | |
5959 | u64 parent; | |
5960 | u32 blocksize; | |
5961 | struct btrfs_key key; | |
5962 | struct extent_buffer *next; | |
5963 | int level = wc->level; | |
5964 | int reada = 0; | |
5965 | int ret = 0; | |
5966 | ||
5967 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
5968 | path->slots[level]); | |
5969 | /* | |
5970 | * if the lower level block was created before the snapshot | |
5971 | * was created, we know there is no need to update back refs | |
5972 | * for the subtree | |
5973 | */ | |
5974 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
5975 | generation <= root->root_key.offset) { |
5976 | *lookup_info = 1; | |
1c4850e2 | 5977 | return 1; |
94fcca9f | 5978 | } |
1c4850e2 YZ |
5979 | |
5980 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
5981 | blocksize = btrfs_level_size(root, level - 1); | |
5982 | ||
5983 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
5984 | if (!next) { | |
5985 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
5986 | if (!next) |
5987 | return -ENOMEM; | |
1c4850e2 YZ |
5988 | reada = 1; |
5989 | } | |
5990 | btrfs_tree_lock(next); | |
5991 | btrfs_set_lock_blocking(next); | |
5992 | ||
94fcca9f YZ |
5993 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
5994 | &wc->refs[level - 1], | |
5995 | &wc->flags[level - 1]); | |
5996 | BUG_ON(ret); | |
5997 | BUG_ON(wc->refs[level - 1] == 0); | |
5998 | *lookup_info = 0; | |
1c4850e2 | 5999 | |
94fcca9f | 6000 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 6001 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
6002 | if (level == 1 && |
6003 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6004 | goto skip; | |
6005 | ||
1c4850e2 YZ |
6006 | if (!wc->update_ref || |
6007 | generation <= root->root_key.offset) | |
6008 | goto skip; | |
6009 | ||
6010 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
6011 | path->slots[level]); | |
6012 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
6013 | if (ret < 0) | |
6014 | goto skip; | |
6015 | ||
6016 | wc->stage = UPDATE_BACKREF; | |
6017 | wc->shared_level = level - 1; | |
6018 | } | |
94fcca9f YZ |
6019 | } else { |
6020 | if (level == 1 && | |
6021 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6022 | goto skip; | |
1c4850e2 YZ |
6023 | } |
6024 | ||
6025 | if (!btrfs_buffer_uptodate(next, generation)) { | |
6026 | btrfs_tree_unlock(next); | |
6027 | free_extent_buffer(next); | |
6028 | next = NULL; | |
94fcca9f | 6029 | *lookup_info = 1; |
1c4850e2 YZ |
6030 | } |
6031 | ||
6032 | if (!next) { | |
6033 | if (reada && level == 1) | |
6034 | reada_walk_down(trans, root, wc, path); | |
6035 | next = read_tree_block(root, bytenr, blocksize, generation); | |
97d9a8a4 TI |
6036 | if (!next) |
6037 | return -EIO; | |
1c4850e2 YZ |
6038 | btrfs_tree_lock(next); |
6039 | btrfs_set_lock_blocking(next); | |
6040 | } | |
6041 | ||
6042 | level--; | |
6043 | BUG_ON(level != btrfs_header_level(next)); | |
6044 | path->nodes[level] = next; | |
6045 | path->slots[level] = 0; | |
6046 | path->locks[level] = 1; | |
6047 | wc->level = level; | |
6048 | if (wc->level == 1) | |
6049 | wc->reada_slot = 0; | |
6050 | return 0; | |
6051 | skip: | |
6052 | wc->refs[level - 1] = 0; | |
6053 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6054 | if (wc->stage == DROP_REFERENCE) { |
6055 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6056 | parent = path->nodes[level]->start; | |
6057 | } else { | |
6058 | BUG_ON(root->root_key.objectid != | |
6059 | btrfs_header_owner(path->nodes[level])); | |
6060 | parent = 0; | |
6061 | } | |
1c4850e2 | 6062 | |
94fcca9f YZ |
6063 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
6064 | root->root_key.objectid, level - 1, 0); | |
6065 | BUG_ON(ret); | |
1c4850e2 | 6066 | } |
1c4850e2 YZ |
6067 | btrfs_tree_unlock(next); |
6068 | free_extent_buffer(next); | |
94fcca9f | 6069 | *lookup_info = 1; |
1c4850e2 YZ |
6070 | return 1; |
6071 | } | |
6072 | ||
2c47e605 YZ |
6073 | /* |
6074 | * hepler to process tree block while walking up the tree. | |
6075 | * | |
6076 | * when wc->stage == DROP_REFERENCE, this function drops | |
6077 | * reference count on the block. | |
6078 | * | |
6079 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6080 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6081 | * to UPDATE_BACKREF previously while processing the block. | |
6082 | * | |
6083 | * NOTE: return value 1 means we should stop walking up. | |
6084 | */ | |
6085 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6086 | struct btrfs_root *root, | |
6087 | struct btrfs_path *path, | |
6088 | struct walk_control *wc) | |
6089 | { | |
f0486c68 | 6090 | int ret; |
2c47e605 YZ |
6091 | int level = wc->level; |
6092 | struct extent_buffer *eb = path->nodes[level]; | |
6093 | u64 parent = 0; | |
6094 | ||
6095 | if (wc->stage == UPDATE_BACKREF) { | |
6096 | BUG_ON(wc->shared_level < level); | |
6097 | if (level < wc->shared_level) | |
6098 | goto out; | |
6099 | ||
2c47e605 YZ |
6100 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6101 | if (ret > 0) | |
6102 | wc->update_ref = 0; | |
6103 | ||
6104 | wc->stage = DROP_REFERENCE; | |
6105 | wc->shared_level = -1; | |
6106 | path->slots[level] = 0; | |
6107 | ||
6108 | /* | |
6109 | * check reference count again if the block isn't locked. | |
6110 | * we should start walking down the tree again if reference | |
6111 | * count is one. | |
6112 | */ | |
6113 | if (!path->locks[level]) { | |
6114 | BUG_ON(level == 0); | |
6115 | btrfs_tree_lock(eb); | |
6116 | btrfs_set_lock_blocking(eb); | |
6117 | path->locks[level] = 1; | |
6118 | ||
6119 | ret = btrfs_lookup_extent_info(trans, root, | |
6120 | eb->start, eb->len, | |
6121 | &wc->refs[level], | |
6122 | &wc->flags[level]); | |
f82d02d9 | 6123 | BUG_ON(ret); |
2c47e605 YZ |
6124 | BUG_ON(wc->refs[level] == 0); |
6125 | if (wc->refs[level] == 1) { | |
6126 | btrfs_tree_unlock(eb); | |
6127 | path->locks[level] = 0; | |
6128 | return 1; | |
6129 | } | |
f82d02d9 | 6130 | } |
2c47e605 | 6131 | } |
f82d02d9 | 6132 | |
2c47e605 YZ |
6133 | /* wc->stage == DROP_REFERENCE */ |
6134 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6135 | |
2c47e605 YZ |
6136 | if (wc->refs[level] == 1) { |
6137 | if (level == 0) { | |
6138 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6139 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
6140 | else | |
6141 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
6142 | BUG_ON(ret); | |
6143 | } | |
6144 | /* make block locked assertion in clean_tree_block happy */ | |
6145 | if (!path->locks[level] && | |
6146 | btrfs_header_generation(eb) == trans->transid) { | |
6147 | btrfs_tree_lock(eb); | |
6148 | btrfs_set_lock_blocking(eb); | |
6149 | path->locks[level] = 1; | |
6150 | } | |
6151 | clean_tree_block(trans, root, eb); | |
6152 | } | |
6153 | ||
6154 | if (eb == root->node) { | |
6155 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6156 | parent = eb->start; | |
6157 | else | |
6158 | BUG_ON(root->root_key.objectid != | |
6159 | btrfs_header_owner(eb)); | |
6160 | } else { | |
6161 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6162 | parent = path->nodes[level + 1]->start; | |
6163 | else | |
6164 | BUG_ON(root->root_key.objectid != | |
6165 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6166 | } |
f82d02d9 | 6167 | |
f0486c68 | 6168 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6169 | out: |
6170 | wc->refs[level] = 0; | |
6171 | wc->flags[level] = 0; | |
f0486c68 | 6172 | return 0; |
2c47e605 YZ |
6173 | } |
6174 | ||
6175 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6176 | struct btrfs_root *root, | |
6177 | struct btrfs_path *path, | |
6178 | struct walk_control *wc) | |
6179 | { | |
2c47e605 | 6180 | int level = wc->level; |
94fcca9f | 6181 | int lookup_info = 1; |
2c47e605 YZ |
6182 | int ret; |
6183 | ||
6184 | while (level >= 0) { | |
94fcca9f | 6185 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6186 | if (ret > 0) |
6187 | break; | |
6188 | ||
6189 | if (level == 0) | |
6190 | break; | |
6191 | ||
7a7965f8 YZ |
6192 | if (path->slots[level] >= |
6193 | btrfs_header_nritems(path->nodes[level])) | |
6194 | break; | |
6195 | ||
94fcca9f | 6196 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6197 | if (ret > 0) { |
6198 | path->slots[level]++; | |
6199 | continue; | |
90d2c51d MX |
6200 | } else if (ret < 0) |
6201 | return ret; | |
1c4850e2 | 6202 | level = wc->level; |
f82d02d9 | 6203 | } |
f82d02d9 YZ |
6204 | return 0; |
6205 | } | |
6206 | ||
d397712b | 6207 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6208 | struct btrfs_root *root, |
f82d02d9 | 6209 | struct btrfs_path *path, |
2c47e605 | 6210 | struct walk_control *wc, int max_level) |
20524f02 | 6211 | { |
2c47e605 | 6212 | int level = wc->level; |
20524f02 | 6213 | int ret; |
9f3a7427 | 6214 | |
2c47e605 YZ |
6215 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6216 | while (level < max_level && path->nodes[level]) { | |
6217 | wc->level = level; | |
6218 | if (path->slots[level] + 1 < | |
6219 | btrfs_header_nritems(path->nodes[level])) { | |
6220 | path->slots[level]++; | |
20524f02 CM |
6221 | return 0; |
6222 | } else { | |
2c47e605 YZ |
6223 | ret = walk_up_proc(trans, root, path, wc); |
6224 | if (ret > 0) | |
6225 | return 0; | |
bd56b302 | 6226 | |
2c47e605 YZ |
6227 | if (path->locks[level]) { |
6228 | btrfs_tree_unlock(path->nodes[level]); | |
6229 | path->locks[level] = 0; | |
f82d02d9 | 6230 | } |
2c47e605 YZ |
6231 | free_extent_buffer(path->nodes[level]); |
6232 | path->nodes[level] = NULL; | |
6233 | level++; | |
20524f02 CM |
6234 | } |
6235 | } | |
6236 | return 1; | |
6237 | } | |
6238 | ||
9aca1d51 | 6239 | /* |
2c47e605 YZ |
6240 | * drop a subvolume tree. |
6241 | * | |
6242 | * this function traverses the tree freeing any blocks that only | |
6243 | * referenced by the tree. | |
6244 | * | |
6245 | * when a shared tree block is found. this function decreases its | |
6246 | * reference count by one. if update_ref is true, this function | |
6247 | * also make sure backrefs for the shared block and all lower level | |
6248 | * blocks are properly updated. | |
9aca1d51 | 6249 | */ |
3fd0a558 YZ |
6250 | int btrfs_drop_snapshot(struct btrfs_root *root, |
6251 | struct btrfs_block_rsv *block_rsv, int update_ref) | |
20524f02 | 6252 | { |
5caf2a00 | 6253 | struct btrfs_path *path; |
2c47e605 YZ |
6254 | struct btrfs_trans_handle *trans; |
6255 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 6256 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
6257 | struct walk_control *wc; |
6258 | struct btrfs_key key; | |
6259 | int err = 0; | |
6260 | int ret; | |
6261 | int level; | |
20524f02 | 6262 | |
5caf2a00 CM |
6263 | path = btrfs_alloc_path(); |
6264 | BUG_ON(!path); | |
20524f02 | 6265 | |
2c47e605 YZ |
6266 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
6267 | BUG_ON(!wc); | |
6268 | ||
a22285a6 | 6269 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 TI |
6270 | BUG_ON(IS_ERR(trans)); |
6271 | ||
3fd0a558 YZ |
6272 | if (block_rsv) |
6273 | trans->block_rsv = block_rsv; | |
2c47e605 | 6274 | |
9f3a7427 | 6275 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 6276 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
6277 | path->nodes[level] = btrfs_lock_root_node(root); |
6278 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 6279 | path->slots[level] = 0; |
5d4f98a2 | 6280 | path->locks[level] = 1; |
2c47e605 YZ |
6281 | memset(&wc->update_progress, 0, |
6282 | sizeof(wc->update_progress)); | |
9f3a7427 | 6283 | } else { |
9f3a7427 | 6284 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
6285 | memcpy(&wc->update_progress, &key, |
6286 | sizeof(wc->update_progress)); | |
6287 | ||
6702ed49 | 6288 | level = root_item->drop_level; |
2c47e605 | 6289 | BUG_ON(level == 0); |
6702ed49 | 6290 | path->lowest_level = level; |
2c47e605 YZ |
6291 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6292 | path->lowest_level = 0; | |
6293 | if (ret < 0) { | |
6294 | err = ret; | |
9f3a7427 CM |
6295 | goto out; |
6296 | } | |
1c4850e2 | 6297 | WARN_ON(ret > 0); |
2c47e605 | 6298 | |
7d9eb12c CM |
6299 | /* |
6300 | * unlock our path, this is safe because only this | |
6301 | * function is allowed to delete this snapshot | |
6302 | */ | |
5d4f98a2 | 6303 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
6304 | |
6305 | level = btrfs_header_level(root->node); | |
6306 | while (1) { | |
6307 | btrfs_tree_lock(path->nodes[level]); | |
6308 | btrfs_set_lock_blocking(path->nodes[level]); | |
6309 | ||
6310 | ret = btrfs_lookup_extent_info(trans, root, | |
6311 | path->nodes[level]->start, | |
6312 | path->nodes[level]->len, | |
6313 | &wc->refs[level], | |
6314 | &wc->flags[level]); | |
6315 | BUG_ON(ret); | |
6316 | BUG_ON(wc->refs[level] == 0); | |
6317 | ||
6318 | if (level == root_item->drop_level) | |
6319 | break; | |
6320 | ||
6321 | btrfs_tree_unlock(path->nodes[level]); | |
6322 | WARN_ON(wc->refs[level] != 1); | |
6323 | level--; | |
6324 | } | |
9f3a7427 | 6325 | } |
2c47e605 YZ |
6326 | |
6327 | wc->level = level; | |
6328 | wc->shared_level = -1; | |
6329 | wc->stage = DROP_REFERENCE; | |
6330 | wc->update_ref = update_ref; | |
6331 | wc->keep_locks = 0; | |
1c4850e2 | 6332 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 6333 | |
d397712b | 6334 | while (1) { |
2c47e605 YZ |
6335 | ret = walk_down_tree(trans, root, path, wc); |
6336 | if (ret < 0) { | |
6337 | err = ret; | |
20524f02 | 6338 | break; |
2c47e605 | 6339 | } |
9aca1d51 | 6340 | |
2c47e605 YZ |
6341 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
6342 | if (ret < 0) { | |
6343 | err = ret; | |
20524f02 | 6344 | break; |
2c47e605 YZ |
6345 | } |
6346 | ||
6347 | if (ret > 0) { | |
6348 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
6349 | break; |
6350 | } | |
2c47e605 YZ |
6351 | |
6352 | if (wc->stage == DROP_REFERENCE) { | |
6353 | level = wc->level; | |
6354 | btrfs_node_key(path->nodes[level], | |
6355 | &root_item->drop_progress, | |
6356 | path->slots[level]); | |
6357 | root_item->drop_level = level; | |
6358 | } | |
6359 | ||
6360 | BUG_ON(wc->level == 0); | |
3fd0a558 | 6361 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
6362 | ret = btrfs_update_root(trans, tree_root, |
6363 | &root->root_key, | |
6364 | root_item); | |
6365 | BUG_ON(ret); | |
6366 | ||
3fd0a558 | 6367 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 6368 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 | 6369 | BUG_ON(IS_ERR(trans)); |
3fd0a558 YZ |
6370 | if (block_rsv) |
6371 | trans->block_rsv = block_rsv; | |
c3e69d58 | 6372 | } |
20524f02 | 6373 | } |
b3b4aa74 | 6374 | btrfs_release_path(path); |
2c47e605 YZ |
6375 | BUG_ON(err); |
6376 | ||
6377 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
6378 | BUG_ON(ret); | |
6379 | ||
76dda93c YZ |
6380 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
6381 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
6382 | NULL, NULL); | |
6383 | BUG_ON(ret < 0); | |
6384 | if (ret > 0) { | |
84cd948c JB |
6385 | /* if we fail to delete the orphan item this time |
6386 | * around, it'll get picked up the next time. | |
6387 | * | |
6388 | * The most common failure here is just -ENOENT. | |
6389 | */ | |
6390 | btrfs_del_orphan_item(trans, tree_root, | |
6391 | root->root_key.objectid); | |
76dda93c YZ |
6392 | } |
6393 | } | |
6394 | ||
6395 | if (root->in_radix) { | |
6396 | btrfs_free_fs_root(tree_root->fs_info, root); | |
6397 | } else { | |
6398 | free_extent_buffer(root->node); | |
6399 | free_extent_buffer(root->commit_root); | |
6400 | kfree(root); | |
6401 | } | |
9f3a7427 | 6402 | out: |
3fd0a558 | 6403 | btrfs_end_transaction_throttle(trans, tree_root); |
2c47e605 | 6404 | kfree(wc); |
5caf2a00 | 6405 | btrfs_free_path(path); |
2c47e605 | 6406 | return err; |
20524f02 | 6407 | } |
9078a3e1 | 6408 | |
2c47e605 YZ |
6409 | /* |
6410 | * drop subtree rooted at tree block 'node'. | |
6411 | * | |
6412 | * NOTE: this function will unlock and release tree block 'node' | |
6413 | */ | |
f82d02d9 YZ |
6414 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6415 | struct btrfs_root *root, | |
6416 | struct extent_buffer *node, | |
6417 | struct extent_buffer *parent) | |
6418 | { | |
6419 | struct btrfs_path *path; | |
2c47e605 | 6420 | struct walk_control *wc; |
f82d02d9 YZ |
6421 | int level; |
6422 | int parent_level; | |
6423 | int ret = 0; | |
6424 | int wret; | |
6425 | ||
2c47e605 YZ |
6426 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6427 | ||
f82d02d9 | 6428 | path = btrfs_alloc_path(); |
db5b493a TI |
6429 | if (!path) |
6430 | return -ENOMEM; | |
f82d02d9 | 6431 | |
2c47e605 | 6432 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
6433 | if (!wc) { |
6434 | btrfs_free_path(path); | |
6435 | return -ENOMEM; | |
6436 | } | |
2c47e605 | 6437 | |
b9447ef8 | 6438 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6439 | parent_level = btrfs_header_level(parent); |
6440 | extent_buffer_get(parent); | |
6441 | path->nodes[parent_level] = parent; | |
6442 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6443 | ||
b9447ef8 | 6444 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6445 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6446 | path->nodes[level] = node; |
6447 | path->slots[level] = 0; | |
2c47e605 YZ |
6448 | path->locks[level] = 1; |
6449 | ||
6450 | wc->refs[parent_level] = 1; | |
6451 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6452 | wc->level = level; | |
6453 | wc->shared_level = -1; | |
6454 | wc->stage = DROP_REFERENCE; | |
6455 | wc->update_ref = 0; | |
6456 | wc->keep_locks = 1; | |
1c4850e2 | 6457 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6458 | |
6459 | while (1) { | |
2c47e605 YZ |
6460 | wret = walk_down_tree(trans, root, path, wc); |
6461 | if (wret < 0) { | |
f82d02d9 | 6462 | ret = wret; |
f82d02d9 | 6463 | break; |
2c47e605 | 6464 | } |
f82d02d9 | 6465 | |
2c47e605 | 6466 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6467 | if (wret < 0) |
6468 | ret = wret; | |
6469 | if (wret != 0) | |
6470 | break; | |
6471 | } | |
6472 | ||
2c47e605 | 6473 | kfree(wc); |
f82d02d9 YZ |
6474 | btrfs_free_path(path); |
6475 | return ret; | |
6476 | } | |
6477 | ||
ec44a35c CM |
6478 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
6479 | { | |
6480 | u64 num_devices; | |
6481 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
6482 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
6483 | ||
cd02dca5 CM |
6484 | /* |
6485 | * we add in the count of missing devices because we want | |
6486 | * to make sure that any RAID levels on a degraded FS | |
6487 | * continue to be honored. | |
6488 | */ | |
6489 | num_devices = root->fs_info->fs_devices->rw_devices + | |
6490 | root->fs_info->fs_devices->missing_devices; | |
6491 | ||
ec44a35c CM |
6492 | if (num_devices == 1) { |
6493 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6494 | stripped = flags & ~stripped; | |
6495 | ||
6496 | /* turn raid0 into single device chunks */ | |
6497 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
6498 | return stripped; | |
6499 | ||
6500 | /* turn mirroring into duplication */ | |
6501 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6502 | BTRFS_BLOCK_GROUP_RAID10)) | |
6503 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
6504 | return flags; | |
6505 | } else { | |
6506 | /* they already had raid on here, just return */ | |
ec44a35c CM |
6507 | if (flags & stripped) |
6508 | return flags; | |
6509 | ||
6510 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6511 | stripped = flags & ~stripped; | |
6512 | ||
6513 | /* switch duplicated blocks with raid1 */ | |
6514 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
6515 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
6516 | ||
6517 | /* turn single device chunks into raid0 */ | |
6518 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
6519 | } | |
6520 | return flags; | |
6521 | } | |
6522 | ||
f0486c68 | 6523 | static int set_block_group_ro(struct btrfs_block_group_cache *cache) |
0ef3e66b | 6524 | { |
f0486c68 YZ |
6525 | struct btrfs_space_info *sinfo = cache->space_info; |
6526 | u64 num_bytes; | |
6527 | int ret = -ENOSPC; | |
0ef3e66b | 6528 | |
f0486c68 YZ |
6529 | if (cache->ro) |
6530 | return 0; | |
c286ac48 | 6531 | |
f0486c68 YZ |
6532 | spin_lock(&sinfo->lock); |
6533 | spin_lock(&cache->lock); | |
6534 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
6535 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6536 | ||
6537 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
6538 | sinfo->bytes_may_use + sinfo->bytes_readonly + | |
65e5341b | 6539 | cache->reserved_pinned + num_bytes <= sinfo->total_bytes) { |
f0486c68 YZ |
6540 | sinfo->bytes_readonly += num_bytes; |
6541 | sinfo->bytes_reserved += cache->reserved_pinned; | |
6542 | cache->reserved_pinned = 0; | |
6543 | cache->ro = 1; | |
6544 | ret = 0; | |
6545 | } | |
65e5341b | 6546 | |
f0486c68 YZ |
6547 | spin_unlock(&cache->lock); |
6548 | spin_unlock(&sinfo->lock); | |
6549 | return ret; | |
6550 | } | |
7d9eb12c | 6551 | |
f0486c68 YZ |
6552 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
6553 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 6554 | |
f0486c68 YZ |
6555 | { |
6556 | struct btrfs_trans_handle *trans; | |
6557 | u64 alloc_flags; | |
6558 | int ret; | |
7d9eb12c | 6559 | |
f0486c68 | 6560 | BUG_ON(cache->ro); |
0ef3e66b | 6561 | |
ff5714cc | 6562 | trans = btrfs_join_transaction(root); |
f0486c68 | 6563 | BUG_ON(IS_ERR(trans)); |
5d4f98a2 | 6564 | |
f0486c68 YZ |
6565 | alloc_flags = update_block_group_flags(root, cache->flags); |
6566 | if (alloc_flags != cache->flags) | |
0e4f8f88 CM |
6567 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6568 | CHUNK_ALLOC_FORCE); | |
5d4f98a2 | 6569 | |
f0486c68 YZ |
6570 | ret = set_block_group_ro(cache); |
6571 | if (!ret) | |
6572 | goto out; | |
6573 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
0e4f8f88 CM |
6574 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6575 | CHUNK_ALLOC_FORCE); | |
f0486c68 YZ |
6576 | if (ret < 0) |
6577 | goto out; | |
6578 | ret = set_block_group_ro(cache); | |
6579 | out: | |
6580 | btrfs_end_transaction(trans, root); | |
6581 | return ret; | |
6582 | } | |
5d4f98a2 | 6583 | |
c87f08ca CM |
6584 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
6585 | struct btrfs_root *root, u64 type) | |
6586 | { | |
6587 | u64 alloc_flags = get_alloc_profile(root, type); | |
0e4f8f88 CM |
6588 | return do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6589 | CHUNK_ALLOC_FORCE); | |
c87f08ca CM |
6590 | } |
6591 | ||
6d07bcec MX |
6592 | /* |
6593 | * helper to account the unused space of all the readonly block group in the | |
6594 | * list. takes mirrors into account. | |
6595 | */ | |
6596 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
6597 | { | |
6598 | struct btrfs_block_group_cache *block_group; | |
6599 | u64 free_bytes = 0; | |
6600 | int factor; | |
6601 | ||
6602 | list_for_each_entry(block_group, groups_list, list) { | |
6603 | spin_lock(&block_group->lock); | |
6604 | ||
6605 | if (!block_group->ro) { | |
6606 | spin_unlock(&block_group->lock); | |
6607 | continue; | |
6608 | } | |
6609 | ||
6610 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6611 | BTRFS_BLOCK_GROUP_RAID10 | | |
6612 | BTRFS_BLOCK_GROUP_DUP)) | |
6613 | factor = 2; | |
6614 | else | |
6615 | factor = 1; | |
6616 | ||
6617 | free_bytes += (block_group->key.offset - | |
6618 | btrfs_block_group_used(&block_group->item)) * | |
6619 | factor; | |
6620 | ||
6621 | spin_unlock(&block_group->lock); | |
6622 | } | |
6623 | ||
6624 | return free_bytes; | |
6625 | } | |
6626 | ||
6627 | /* | |
6628 | * helper to account the unused space of all the readonly block group in the | |
6629 | * space_info. takes mirrors into account. | |
6630 | */ | |
6631 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
6632 | { | |
6633 | int i; | |
6634 | u64 free_bytes = 0; | |
6635 | ||
6636 | spin_lock(&sinfo->lock); | |
6637 | ||
6638 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
6639 | if (!list_empty(&sinfo->block_groups[i])) | |
6640 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
6641 | &sinfo->block_groups[i]); | |
6642 | ||
6643 | spin_unlock(&sinfo->lock); | |
6644 | ||
6645 | return free_bytes; | |
6646 | } | |
6647 | ||
f0486c68 YZ |
6648 | int btrfs_set_block_group_rw(struct btrfs_root *root, |
6649 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 6650 | { |
f0486c68 YZ |
6651 | struct btrfs_space_info *sinfo = cache->space_info; |
6652 | u64 num_bytes; | |
6653 | ||
6654 | BUG_ON(!cache->ro); | |
6655 | ||
6656 | spin_lock(&sinfo->lock); | |
6657 | spin_lock(&cache->lock); | |
6658 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
6659 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6660 | sinfo->bytes_readonly -= num_bytes; | |
6661 | cache->ro = 0; | |
6662 | spin_unlock(&cache->lock); | |
6663 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
6664 | return 0; |
6665 | } | |
6666 | ||
ba1bf481 JB |
6667 | /* |
6668 | * checks to see if its even possible to relocate this block group. | |
6669 | * | |
6670 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
6671 | * ok to go ahead and try. | |
6672 | */ | |
6673 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 6674 | { |
ba1bf481 JB |
6675 | struct btrfs_block_group_cache *block_group; |
6676 | struct btrfs_space_info *space_info; | |
6677 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
6678 | struct btrfs_device *device; | |
6679 | int full = 0; | |
6680 | int ret = 0; | |
1a40e23b | 6681 | |
ba1bf481 | 6682 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 6683 | |
ba1bf481 JB |
6684 | /* odd, couldn't find the block group, leave it alone */ |
6685 | if (!block_group) | |
6686 | return -1; | |
1a40e23b | 6687 | |
ba1bf481 JB |
6688 | /* no bytes used, we're good */ |
6689 | if (!btrfs_block_group_used(&block_group->item)) | |
1a40e23b ZY |
6690 | goto out; |
6691 | ||
ba1bf481 JB |
6692 | space_info = block_group->space_info; |
6693 | spin_lock(&space_info->lock); | |
17d217fe | 6694 | |
ba1bf481 | 6695 | full = space_info->full; |
17d217fe | 6696 | |
ba1bf481 JB |
6697 | /* |
6698 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
6699 | * relocate it unless we're able to allocate a new chunk below. |
6700 | * | |
6701 | * Otherwise, we need to make sure we have room in the space to handle | |
6702 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 6703 | */ |
7ce618db CM |
6704 | if ((space_info->total_bytes != block_group->key.offset) && |
6705 | (space_info->bytes_used + space_info->bytes_reserved + | |
ba1bf481 JB |
6706 | space_info->bytes_pinned + space_info->bytes_readonly + |
6707 | btrfs_block_group_used(&block_group->item) < | |
7ce618db | 6708 | space_info->total_bytes)) { |
ba1bf481 JB |
6709 | spin_unlock(&space_info->lock); |
6710 | goto out; | |
17d217fe | 6711 | } |
ba1bf481 | 6712 | spin_unlock(&space_info->lock); |
ea8c2819 | 6713 | |
ba1bf481 JB |
6714 | /* |
6715 | * ok we don't have enough space, but maybe we have free space on our | |
6716 | * devices to allocate new chunks for relocation, so loop through our | |
6717 | * alloc devices and guess if we have enough space. However, if we | |
6718 | * were marked as full, then we know there aren't enough chunks, and we | |
6719 | * can just return. | |
6720 | */ | |
6721 | ret = -1; | |
6722 | if (full) | |
6723 | goto out; | |
ea8c2819 | 6724 | |
ba1bf481 JB |
6725 | mutex_lock(&root->fs_info->chunk_mutex); |
6726 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
6727 | u64 min_free = btrfs_block_group_used(&block_group->item); | |
7bfc837d | 6728 | u64 dev_offset; |
56bec294 | 6729 | |
ba1bf481 JB |
6730 | /* |
6731 | * check to make sure we can actually find a chunk with enough | |
6732 | * space to fit our block group in. | |
6733 | */ | |
6734 | if (device->total_bytes > device->bytes_used + min_free) { | |
6735 | ret = find_free_dev_extent(NULL, device, min_free, | |
7bfc837d | 6736 | &dev_offset, NULL); |
ba1bf481 | 6737 | if (!ret) |
73e48b27 | 6738 | break; |
ba1bf481 | 6739 | ret = -1; |
725c8463 | 6740 | } |
edbd8d4e | 6741 | } |
ba1bf481 | 6742 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 6743 | out: |
ba1bf481 | 6744 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
6745 | return ret; |
6746 | } | |
6747 | ||
b2950863 CH |
6748 | static int find_first_block_group(struct btrfs_root *root, |
6749 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 6750 | { |
925baedd | 6751 | int ret = 0; |
0b86a832 CM |
6752 | struct btrfs_key found_key; |
6753 | struct extent_buffer *leaf; | |
6754 | int slot; | |
edbd8d4e | 6755 | |
0b86a832 CM |
6756 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
6757 | if (ret < 0) | |
925baedd CM |
6758 | goto out; |
6759 | ||
d397712b | 6760 | while (1) { |
0b86a832 | 6761 | slot = path->slots[0]; |
edbd8d4e | 6762 | leaf = path->nodes[0]; |
0b86a832 CM |
6763 | if (slot >= btrfs_header_nritems(leaf)) { |
6764 | ret = btrfs_next_leaf(root, path); | |
6765 | if (ret == 0) | |
6766 | continue; | |
6767 | if (ret < 0) | |
925baedd | 6768 | goto out; |
0b86a832 | 6769 | break; |
edbd8d4e | 6770 | } |
0b86a832 | 6771 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 6772 | |
0b86a832 | 6773 | if (found_key.objectid >= key->objectid && |
925baedd CM |
6774 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
6775 | ret = 0; | |
6776 | goto out; | |
6777 | } | |
0b86a832 | 6778 | path->slots[0]++; |
edbd8d4e | 6779 | } |
925baedd | 6780 | out: |
0b86a832 | 6781 | return ret; |
edbd8d4e CM |
6782 | } |
6783 | ||
0af3d00b JB |
6784 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
6785 | { | |
6786 | struct btrfs_block_group_cache *block_group; | |
6787 | u64 last = 0; | |
6788 | ||
6789 | while (1) { | |
6790 | struct inode *inode; | |
6791 | ||
6792 | block_group = btrfs_lookup_first_block_group(info, last); | |
6793 | while (block_group) { | |
6794 | spin_lock(&block_group->lock); | |
6795 | if (block_group->iref) | |
6796 | break; | |
6797 | spin_unlock(&block_group->lock); | |
6798 | block_group = next_block_group(info->tree_root, | |
6799 | block_group); | |
6800 | } | |
6801 | if (!block_group) { | |
6802 | if (last == 0) | |
6803 | break; | |
6804 | last = 0; | |
6805 | continue; | |
6806 | } | |
6807 | ||
6808 | inode = block_group->inode; | |
6809 | block_group->iref = 0; | |
6810 | block_group->inode = NULL; | |
6811 | spin_unlock(&block_group->lock); | |
6812 | iput(inode); | |
6813 | last = block_group->key.objectid + block_group->key.offset; | |
6814 | btrfs_put_block_group(block_group); | |
6815 | } | |
6816 | } | |
6817 | ||
1a40e23b ZY |
6818 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
6819 | { | |
6820 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 6821 | struct btrfs_space_info *space_info; |
11833d66 | 6822 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
6823 | struct rb_node *n; |
6824 | ||
11833d66 YZ |
6825 | down_write(&info->extent_commit_sem); |
6826 | while (!list_empty(&info->caching_block_groups)) { | |
6827 | caching_ctl = list_entry(info->caching_block_groups.next, | |
6828 | struct btrfs_caching_control, list); | |
6829 | list_del(&caching_ctl->list); | |
6830 | put_caching_control(caching_ctl); | |
6831 | } | |
6832 | up_write(&info->extent_commit_sem); | |
6833 | ||
1a40e23b ZY |
6834 | spin_lock(&info->block_group_cache_lock); |
6835 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
6836 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
6837 | cache_node); | |
1a40e23b ZY |
6838 | rb_erase(&block_group->cache_node, |
6839 | &info->block_group_cache_tree); | |
d899e052 YZ |
6840 | spin_unlock(&info->block_group_cache_lock); |
6841 | ||
80eb234a | 6842 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 6843 | list_del(&block_group->list); |
80eb234a | 6844 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 6845 | |
817d52f8 | 6846 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 6847 | wait_block_group_cache_done(block_group); |
817d52f8 | 6848 | |
3c14874a JB |
6849 | /* |
6850 | * We haven't cached this block group, which means we could | |
6851 | * possibly have excluded extents on this block group. | |
6852 | */ | |
6853 | if (block_group->cached == BTRFS_CACHE_NO) | |
6854 | free_excluded_extents(info->extent_root, block_group); | |
6855 | ||
817d52f8 | 6856 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 6857 | btrfs_put_block_group(block_group); |
d899e052 YZ |
6858 | |
6859 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
6860 | } |
6861 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
6862 | |
6863 | /* now that all the block groups are freed, go through and | |
6864 | * free all the space_info structs. This is only called during | |
6865 | * the final stages of unmount, and so we know nobody is | |
6866 | * using them. We call synchronize_rcu() once before we start, | |
6867 | * just to be on the safe side. | |
6868 | */ | |
6869 | synchronize_rcu(); | |
6870 | ||
8929ecfa YZ |
6871 | release_global_block_rsv(info); |
6872 | ||
4184ea7f CM |
6873 | while(!list_empty(&info->space_info)) { |
6874 | space_info = list_entry(info->space_info.next, | |
6875 | struct btrfs_space_info, | |
6876 | list); | |
f0486c68 YZ |
6877 | if (space_info->bytes_pinned > 0 || |
6878 | space_info->bytes_reserved > 0) { | |
6879 | WARN_ON(1); | |
6880 | dump_space_info(space_info, 0, 0); | |
6881 | } | |
4184ea7f CM |
6882 | list_del(&space_info->list); |
6883 | kfree(space_info); | |
6884 | } | |
1a40e23b ZY |
6885 | return 0; |
6886 | } | |
6887 | ||
b742bb82 YZ |
6888 | static void __link_block_group(struct btrfs_space_info *space_info, |
6889 | struct btrfs_block_group_cache *cache) | |
6890 | { | |
6891 | int index = get_block_group_index(cache); | |
6892 | ||
6893 | down_write(&space_info->groups_sem); | |
6894 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
6895 | up_write(&space_info->groups_sem); | |
6896 | } | |
6897 | ||
9078a3e1 CM |
6898 | int btrfs_read_block_groups(struct btrfs_root *root) |
6899 | { | |
6900 | struct btrfs_path *path; | |
6901 | int ret; | |
9078a3e1 | 6902 | struct btrfs_block_group_cache *cache; |
be744175 | 6903 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 6904 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
6905 | struct btrfs_key key; |
6906 | struct btrfs_key found_key; | |
5f39d397 | 6907 | struct extent_buffer *leaf; |
0af3d00b JB |
6908 | int need_clear = 0; |
6909 | u64 cache_gen; | |
96b5179d | 6910 | |
be744175 | 6911 | root = info->extent_root; |
9078a3e1 | 6912 | key.objectid = 0; |
0b86a832 | 6913 | key.offset = 0; |
9078a3e1 | 6914 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
6915 | path = btrfs_alloc_path(); |
6916 | if (!path) | |
6917 | return -ENOMEM; | |
026fd317 | 6918 | path->reada = 1; |
9078a3e1 | 6919 | |
0af3d00b JB |
6920 | cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy); |
6921 | if (cache_gen != 0 && | |
6922 | btrfs_super_generation(&root->fs_info->super_copy) != cache_gen) | |
6923 | need_clear = 1; | |
88c2ba3b JB |
6924 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
6925 | need_clear = 1; | |
8216ef86 JB |
6926 | if (!btrfs_test_opt(root, SPACE_CACHE) && cache_gen) |
6927 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
0af3d00b | 6928 | |
d397712b | 6929 | while (1) { |
0b86a832 | 6930 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
6931 | if (ret > 0) |
6932 | break; | |
0b86a832 CM |
6933 | if (ret != 0) |
6934 | goto error; | |
5f39d397 CM |
6935 | leaf = path->nodes[0]; |
6936 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 6937 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 6938 | if (!cache) { |
0b86a832 | 6939 | ret = -ENOMEM; |
f0486c68 | 6940 | goto error; |
9078a3e1 | 6941 | } |
34d52cb6 LZ |
6942 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
6943 | GFP_NOFS); | |
6944 | if (!cache->free_space_ctl) { | |
6945 | kfree(cache); | |
6946 | ret = -ENOMEM; | |
6947 | goto error; | |
6948 | } | |
3e1ad54f | 6949 | |
d2fb3437 | 6950 | atomic_set(&cache->count, 1); |
c286ac48 | 6951 | spin_lock_init(&cache->lock); |
817d52f8 | 6952 | cache->fs_info = info; |
0f9dd46c | 6953 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 6954 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 6955 | |
0af3d00b JB |
6956 | if (need_clear) |
6957 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
6958 | ||
5f39d397 CM |
6959 | read_extent_buffer(leaf, &cache->item, |
6960 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
6961 | sizeof(cache->item)); | |
9078a3e1 | 6962 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 6963 | |
9078a3e1 | 6964 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 6965 | btrfs_release_path(path); |
0b86a832 | 6966 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
6967 | cache->sectorsize = root->sectorsize; |
6968 | ||
34d52cb6 LZ |
6969 | btrfs_init_free_space_ctl(cache); |
6970 | ||
3c14874a JB |
6971 | /* |
6972 | * We need to exclude the super stripes now so that the space | |
6973 | * info has super bytes accounted for, otherwise we'll think | |
6974 | * we have more space than we actually do. | |
6975 | */ | |
6976 | exclude_super_stripes(root, cache); | |
6977 | ||
817d52f8 JB |
6978 | /* |
6979 | * check for two cases, either we are full, and therefore | |
6980 | * don't need to bother with the caching work since we won't | |
6981 | * find any space, or we are empty, and we can just add all | |
6982 | * the space in and be done with it. This saves us _alot_ of | |
6983 | * time, particularly in the full case. | |
6984 | */ | |
6985 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 6986 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 6987 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 6988 | free_excluded_extents(root, cache); |
817d52f8 | 6989 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 6990 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
6991 | cache->cached = BTRFS_CACHE_FINISHED; |
6992 | add_new_free_space(cache, root->fs_info, | |
6993 | found_key.objectid, | |
6994 | found_key.objectid + | |
6995 | found_key.offset); | |
11833d66 | 6996 | free_excluded_extents(root, cache); |
817d52f8 | 6997 | } |
96b5179d | 6998 | |
6324fbf3 CM |
6999 | ret = update_space_info(info, cache->flags, found_key.offset, |
7000 | btrfs_block_group_used(&cache->item), | |
7001 | &space_info); | |
7002 | BUG_ON(ret); | |
7003 | cache->space_info = space_info; | |
1b2da372 | 7004 | spin_lock(&cache->space_info->lock); |
f0486c68 | 7005 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7006 | spin_unlock(&cache->space_info->lock); |
7007 | ||
b742bb82 | 7008 | __link_block_group(space_info, cache); |
0f9dd46c JB |
7009 | |
7010 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
7011 | BUG_ON(ret); | |
75ccf47d CM |
7012 | |
7013 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 7014 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
f0486c68 | 7015 | set_block_group_ro(cache); |
9078a3e1 | 7016 | } |
b742bb82 YZ |
7017 | |
7018 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
7019 | if (!(get_alloc_profile(root, space_info->flags) & | |
7020 | (BTRFS_BLOCK_GROUP_RAID10 | | |
7021 | BTRFS_BLOCK_GROUP_RAID1 | | |
7022 | BTRFS_BLOCK_GROUP_DUP))) | |
7023 | continue; | |
7024 | /* | |
7025 | * avoid allocating from un-mirrored block group if there are | |
7026 | * mirrored block groups. | |
7027 | */ | |
7028 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
f0486c68 | 7029 | set_block_group_ro(cache); |
b742bb82 | 7030 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
f0486c68 | 7031 | set_block_group_ro(cache); |
9078a3e1 | 7032 | } |
f0486c68 YZ |
7033 | |
7034 | init_global_block_rsv(info); | |
0b86a832 CM |
7035 | ret = 0; |
7036 | error: | |
9078a3e1 | 7037 | btrfs_free_path(path); |
0b86a832 | 7038 | return ret; |
9078a3e1 | 7039 | } |
6324fbf3 CM |
7040 | |
7041 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
7042 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7043 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7044 | u64 size) |
7045 | { | |
7046 | int ret; | |
6324fbf3 CM |
7047 | struct btrfs_root *extent_root; |
7048 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7049 | |
7050 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7051 | |
12fcfd22 | 7052 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 7053 | |
8f18cf13 | 7054 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
7055 | if (!cache) |
7056 | return -ENOMEM; | |
34d52cb6 LZ |
7057 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7058 | GFP_NOFS); | |
7059 | if (!cache->free_space_ctl) { | |
7060 | kfree(cache); | |
7061 | return -ENOMEM; | |
7062 | } | |
0f9dd46c | 7063 | |
e17cade2 | 7064 | cache->key.objectid = chunk_offset; |
6324fbf3 | 7065 | cache->key.offset = size; |
d2fb3437 | 7066 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 7067 | cache->sectorsize = root->sectorsize; |
0af3d00b | 7068 | cache->fs_info = root->fs_info; |
96303081 | 7069 | |
d2fb3437 | 7070 | atomic_set(&cache->count, 1); |
c286ac48 | 7071 | spin_lock_init(&cache->lock); |
0f9dd46c | 7072 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7073 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 7074 | |
34d52cb6 LZ |
7075 | btrfs_init_free_space_ctl(cache); |
7076 | ||
6324fbf3 | 7077 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
7078 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
7079 | cache->flags = type; | |
7080 | btrfs_set_block_group_flags(&cache->item, type); | |
7081 | ||
11833d66 | 7082 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7083 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 7084 | exclude_super_stripes(root, cache); |
96303081 | 7085 | |
817d52f8 JB |
7086 | add_new_free_space(cache, root->fs_info, chunk_offset, |
7087 | chunk_offset + size); | |
7088 | ||
11833d66 YZ |
7089 | free_excluded_extents(root, cache); |
7090 | ||
6324fbf3 CM |
7091 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
7092 | &cache->space_info); | |
7093 | BUG_ON(ret); | |
1b2da372 JB |
7094 | |
7095 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 7096 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7097 | spin_unlock(&cache->space_info->lock); |
7098 | ||
b742bb82 | 7099 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 7100 | |
0f9dd46c JB |
7101 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
7102 | BUG_ON(ret); | |
c286ac48 | 7103 | |
6324fbf3 CM |
7104 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
7105 | sizeof(cache->item)); | |
7106 | BUG_ON(ret); | |
7107 | ||
d18a2c44 | 7108 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 7109 | |
6324fbf3 CM |
7110 | return 0; |
7111 | } | |
1a40e23b ZY |
7112 | |
7113 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
7114 | struct btrfs_root *root, u64 group_start) | |
7115 | { | |
7116 | struct btrfs_path *path; | |
7117 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 7118 | struct btrfs_free_cluster *cluster; |
0af3d00b | 7119 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 7120 | struct btrfs_key key; |
0af3d00b | 7121 | struct inode *inode; |
1a40e23b | 7122 | int ret; |
89a55897 | 7123 | int factor; |
1a40e23b | 7124 | |
1a40e23b ZY |
7125 | root = root->fs_info->extent_root; |
7126 | ||
7127 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
7128 | BUG_ON(!block_group); | |
c146afad | 7129 | BUG_ON(!block_group->ro); |
1a40e23b | 7130 | |
9f7c43c9 | 7131 | /* |
7132 | * Free the reserved super bytes from this block group before | |
7133 | * remove it. | |
7134 | */ | |
7135 | free_excluded_extents(root, block_group); | |
7136 | ||
1a40e23b | 7137 | memcpy(&key, &block_group->key, sizeof(key)); |
89a55897 JB |
7138 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
7139 | BTRFS_BLOCK_GROUP_RAID1 | | |
7140 | BTRFS_BLOCK_GROUP_RAID10)) | |
7141 | factor = 2; | |
7142 | else | |
7143 | factor = 1; | |
1a40e23b | 7144 | |
44fb5511 CM |
7145 | /* make sure this block group isn't part of an allocation cluster */ |
7146 | cluster = &root->fs_info->data_alloc_cluster; | |
7147 | spin_lock(&cluster->refill_lock); | |
7148 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7149 | spin_unlock(&cluster->refill_lock); | |
7150 | ||
7151 | /* | |
7152 | * make sure this block group isn't part of a metadata | |
7153 | * allocation cluster | |
7154 | */ | |
7155 | cluster = &root->fs_info->meta_alloc_cluster; | |
7156 | spin_lock(&cluster->refill_lock); | |
7157 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7158 | spin_unlock(&cluster->refill_lock); | |
7159 | ||
1a40e23b ZY |
7160 | path = btrfs_alloc_path(); |
7161 | BUG_ON(!path); | |
7162 | ||
0af3d00b JB |
7163 | inode = lookup_free_space_inode(root, block_group, path); |
7164 | if (!IS_ERR(inode)) { | |
7165 | btrfs_orphan_add(trans, inode); | |
7166 | clear_nlink(inode); | |
7167 | /* One for the block groups ref */ | |
7168 | spin_lock(&block_group->lock); | |
7169 | if (block_group->iref) { | |
7170 | block_group->iref = 0; | |
7171 | block_group->inode = NULL; | |
7172 | spin_unlock(&block_group->lock); | |
7173 | iput(inode); | |
7174 | } else { | |
7175 | spin_unlock(&block_group->lock); | |
7176 | } | |
7177 | /* One for our lookup ref */ | |
7178 | iput(inode); | |
7179 | } | |
7180 | ||
7181 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
7182 | key.offset = block_group->key.objectid; | |
7183 | key.type = 0; | |
7184 | ||
7185 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
7186 | if (ret < 0) | |
7187 | goto out; | |
7188 | if (ret > 0) | |
b3b4aa74 | 7189 | btrfs_release_path(path); |
0af3d00b JB |
7190 | if (ret == 0) { |
7191 | ret = btrfs_del_item(trans, tree_root, path); | |
7192 | if (ret) | |
7193 | goto out; | |
b3b4aa74 | 7194 | btrfs_release_path(path); |
0af3d00b JB |
7195 | } |
7196 | ||
3dfdb934 | 7197 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
7198 | rb_erase(&block_group->cache_node, |
7199 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 7200 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 7201 | |
80eb234a | 7202 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
7203 | /* |
7204 | * we must use list_del_init so people can check to see if they | |
7205 | * are still on the list after taking the semaphore | |
7206 | */ | |
7207 | list_del_init(&block_group->list); | |
80eb234a | 7208 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 7209 | |
817d52f8 | 7210 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7211 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7212 | |
7213 | btrfs_remove_free_space_cache(block_group); | |
7214 | ||
c146afad YZ |
7215 | spin_lock(&block_group->space_info->lock); |
7216 | block_group->space_info->total_bytes -= block_group->key.offset; | |
7217 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 7218 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 7219 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 7220 | |
0af3d00b JB |
7221 | memcpy(&key, &block_group->key, sizeof(key)); |
7222 | ||
283bb197 | 7223 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 7224 | |
fa9c0d79 CM |
7225 | btrfs_put_block_group(block_group); |
7226 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
7227 | |
7228 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
7229 | if (ret > 0) | |
7230 | ret = -EIO; | |
7231 | if (ret < 0) | |
7232 | goto out; | |
7233 | ||
7234 | ret = btrfs_del_item(trans, root, path); | |
7235 | out: | |
7236 | btrfs_free_path(path); | |
7237 | return ret; | |
7238 | } | |
acce952b | 7239 | |
c59021f8 | 7240 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
7241 | { | |
7242 | struct btrfs_space_info *space_info; | |
1aba86d6 | 7243 | struct btrfs_super_block *disk_super; |
7244 | u64 features; | |
7245 | u64 flags; | |
7246 | int mixed = 0; | |
c59021f8 | 7247 | int ret; |
7248 | ||
1aba86d6 | 7249 | disk_super = &fs_info->super_copy; |
7250 | if (!btrfs_super_root(disk_super)) | |
7251 | return 1; | |
c59021f8 | 7252 | |
1aba86d6 | 7253 | features = btrfs_super_incompat_flags(disk_super); |
7254 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
7255 | mixed = 1; | |
c59021f8 | 7256 | |
1aba86d6 | 7257 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
7258 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 7259 | if (ret) |
1aba86d6 | 7260 | goto out; |
c59021f8 | 7261 | |
1aba86d6 | 7262 | if (mixed) { |
7263 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
7264 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7265 | } else { | |
7266 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
7267 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7268 | if (ret) | |
7269 | goto out; | |
7270 | ||
7271 | flags = BTRFS_BLOCK_GROUP_DATA; | |
7272 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7273 | } | |
7274 | out: | |
c59021f8 | 7275 | return ret; |
7276 | } | |
7277 | ||
acce952b | 7278 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
7279 | { | |
7280 | return unpin_extent_range(root, start, end); | |
7281 | } | |
7282 | ||
7283 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 7284 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 7285 | { |
5378e607 | 7286 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 7287 | } |
f7039b1d LD |
7288 | |
7289 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
7290 | { | |
7291 | struct btrfs_fs_info *fs_info = root->fs_info; | |
7292 | struct btrfs_block_group_cache *cache = NULL; | |
7293 | u64 group_trimmed; | |
7294 | u64 start; | |
7295 | u64 end; | |
7296 | u64 trimmed = 0; | |
7297 | int ret = 0; | |
7298 | ||
7299 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
7300 | ||
7301 | while (cache) { | |
7302 | if (cache->key.objectid >= (range->start + range->len)) { | |
7303 | btrfs_put_block_group(cache); | |
7304 | break; | |
7305 | } | |
7306 | ||
7307 | start = max(range->start, cache->key.objectid); | |
7308 | end = min(range->start + range->len, | |
7309 | cache->key.objectid + cache->key.offset); | |
7310 | ||
7311 | if (end - start >= range->minlen) { | |
7312 | if (!block_group_cache_done(cache)) { | |
7313 | ret = cache_block_group(cache, NULL, root, 0); | |
7314 | if (!ret) | |
7315 | wait_block_group_cache_done(cache); | |
7316 | } | |
7317 | ret = btrfs_trim_block_group(cache, | |
7318 | &group_trimmed, | |
7319 | start, | |
7320 | end, | |
7321 | range->minlen); | |
7322 | ||
7323 | trimmed += group_trimmed; | |
7324 | if (ret) { | |
7325 | btrfs_put_block_group(cache); | |
7326 | break; | |
7327 | } | |
7328 | } | |
7329 | ||
7330 | cache = next_block_group(fs_info->tree_root, cache); | |
7331 | } | |
7332 | ||
7333 | range->len = trimmed; | |
7334 | return ret; | |
7335 | } |