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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> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
b150a4f1 | 27 | #include <linux/percpu_counter.h> |
74493f7a | 28 | #include "hash.h" |
995946dd | 29 | #include "tree-log.h" |
fec577fb CM |
30 | #include "disk-io.h" |
31 | #include "print-tree.h" | |
0b86a832 | 32 | #include "volumes.h" |
53b381b3 | 33 | #include "raid56.h" |
925baedd | 34 | #include "locking.h" |
fa9c0d79 | 35 | #include "free-space-cache.h" |
3fed40cc | 36 | #include "math.h" |
6ab0a202 | 37 | #include "sysfs.h" |
fcebe456 | 38 | #include "qgroup.h" |
fec577fb | 39 | |
709c0486 AJ |
40 | #undef SCRAMBLE_DELAYED_REFS |
41 | ||
9e622d6b MX |
42 | /* |
43 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
45 | * if we really need one. | |
46 | * | |
0e4f8f88 CM |
47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
48 | * if we have very few chunks already allocated. This is | |
49 | * used as part of the clustering code to help make sure | |
50 | * we have a good pool of storage to cluster in, without | |
51 | * filling the FS with empty chunks | |
52 | * | |
9e622d6b MX |
53 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
54 | * | |
0e4f8f88 CM |
55 | */ |
56 | enum { | |
57 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
58 | CHUNK_ALLOC_LIMITED = 1, |
59 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
60 | }; |
61 | ||
fb25e914 JB |
62 | /* |
63 | * Control how reservations are dealt with. | |
64 | * | |
65 | * RESERVE_FREE - freeing a reservation. | |
66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
67 | * ENOSPC accounting | |
68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
69 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
70 | */ | |
71 | enum { | |
72 | RESERVE_FREE = 0, | |
73 | RESERVE_ALLOC = 1, | |
74 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
75 | }; | |
76 | ||
ce93ec54 JB |
77 | static int update_block_group(struct btrfs_trans_handle *trans, |
78 | struct btrfs_root *root, u64 bytenr, | |
79 | u64 num_bytes, int alloc); | |
5d4f98a2 YZ |
80 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
81 | struct btrfs_root *root, | |
c682f9b3 | 82 | struct btrfs_delayed_ref_node *node, u64 parent, |
5d4f98a2 YZ |
83 | u64 root_objectid, u64 owner_objectid, |
84 | u64 owner_offset, int refs_to_drop, | |
c682f9b3 | 85 | struct btrfs_delayed_extent_op *extra_op); |
5d4f98a2 YZ |
86 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
87 | struct extent_buffer *leaf, | |
88 | struct btrfs_extent_item *ei); | |
89 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
90 | struct btrfs_root *root, | |
91 | u64 parent, u64 root_objectid, | |
92 | u64 flags, u64 owner, u64 offset, | |
93 | struct btrfs_key *ins, int ref_mod); | |
94 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
95 | struct btrfs_root *root, | |
96 | u64 parent, u64 root_objectid, | |
97 | u64 flags, struct btrfs_disk_key *key, | |
fcebe456 JB |
98 | int level, struct btrfs_key *ins, |
99 | int no_quota); | |
6a63209f | 100 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
101 | struct btrfs_root *extent_root, u64 flags, |
102 | int force); | |
11833d66 YZ |
103 | static int find_next_key(struct btrfs_path *path, int level, |
104 | struct btrfs_key *key); | |
9ed74f2d JB |
105 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
106 | int dump_block_groups); | |
fb25e914 | 107 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
e570fd27 MX |
108 | u64 num_bytes, int reserve, |
109 | int delalloc); | |
5d80366e JB |
110 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
111 | u64 num_bytes); | |
48a3b636 ES |
112 | int btrfs_pin_extent(struct btrfs_root *root, |
113 | u64 bytenr, u64 num_bytes, int reserved); | |
6a63209f | 114 | |
817d52f8 JB |
115 | static noinline int |
116 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
117 | { | |
118 | smp_mb(); | |
36cce922 JB |
119 | return cache->cached == BTRFS_CACHE_FINISHED || |
120 | cache->cached == BTRFS_CACHE_ERROR; | |
817d52f8 JB |
121 | } |
122 | ||
0f9dd46c JB |
123 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
124 | { | |
125 | return (cache->flags & bits) == bits; | |
126 | } | |
127 | ||
62a45b60 | 128 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
129 | { |
130 | atomic_inc(&cache->count); | |
131 | } | |
132 | ||
133 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
134 | { | |
f0486c68 YZ |
135 | if (atomic_dec_and_test(&cache->count)) { |
136 | WARN_ON(cache->pinned > 0); | |
137 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 138 | kfree(cache->free_space_ctl); |
11dfe35a | 139 | kfree(cache); |
f0486c68 | 140 | } |
11dfe35a JB |
141 | } |
142 | ||
0f9dd46c JB |
143 | /* |
144 | * this adds the block group to the fs_info rb tree for the block group | |
145 | * cache | |
146 | */ | |
b2950863 | 147 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
148 | struct btrfs_block_group_cache *block_group) |
149 | { | |
150 | struct rb_node **p; | |
151 | struct rb_node *parent = NULL; | |
152 | struct btrfs_block_group_cache *cache; | |
153 | ||
154 | spin_lock(&info->block_group_cache_lock); | |
155 | p = &info->block_group_cache_tree.rb_node; | |
156 | ||
157 | while (*p) { | |
158 | parent = *p; | |
159 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
160 | cache_node); | |
161 | if (block_group->key.objectid < cache->key.objectid) { | |
162 | p = &(*p)->rb_left; | |
163 | } else if (block_group->key.objectid > cache->key.objectid) { | |
164 | p = &(*p)->rb_right; | |
165 | } else { | |
166 | spin_unlock(&info->block_group_cache_lock); | |
167 | return -EEXIST; | |
168 | } | |
169 | } | |
170 | ||
171 | rb_link_node(&block_group->cache_node, parent, p); | |
172 | rb_insert_color(&block_group->cache_node, | |
173 | &info->block_group_cache_tree); | |
a1897fdd LB |
174 | |
175 | if (info->first_logical_byte > block_group->key.objectid) | |
176 | info->first_logical_byte = block_group->key.objectid; | |
177 | ||
0f9dd46c JB |
178 | spin_unlock(&info->block_group_cache_lock); |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * This will return the block group at or after bytenr if contains is 0, else | |
185 | * it will return the block group that contains the bytenr | |
186 | */ | |
187 | static struct btrfs_block_group_cache * | |
188 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
189 | int contains) | |
190 | { | |
191 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
192 | struct rb_node *n; | |
193 | u64 end, start; | |
194 | ||
195 | spin_lock(&info->block_group_cache_lock); | |
196 | n = info->block_group_cache_tree.rb_node; | |
197 | ||
198 | while (n) { | |
199 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
200 | cache_node); | |
201 | end = cache->key.objectid + cache->key.offset - 1; | |
202 | start = cache->key.objectid; | |
203 | ||
204 | if (bytenr < start) { | |
205 | if (!contains && (!ret || start < ret->key.objectid)) | |
206 | ret = cache; | |
207 | n = n->rb_left; | |
208 | } else if (bytenr > start) { | |
209 | if (contains && bytenr <= end) { | |
210 | ret = cache; | |
211 | break; | |
212 | } | |
213 | n = n->rb_right; | |
214 | } else { | |
215 | ret = cache; | |
216 | break; | |
217 | } | |
218 | } | |
a1897fdd | 219 | if (ret) { |
11dfe35a | 220 | btrfs_get_block_group(ret); |
a1897fdd LB |
221 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
222 | info->first_logical_byte = ret->key.objectid; | |
223 | } | |
0f9dd46c JB |
224 | spin_unlock(&info->block_group_cache_lock); |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
11833d66 YZ |
229 | static int add_excluded_extent(struct btrfs_root *root, |
230 | u64 start, u64 num_bytes) | |
817d52f8 | 231 | { |
11833d66 YZ |
232 | u64 end = start + num_bytes - 1; |
233 | set_extent_bits(&root->fs_info->freed_extents[0], | |
234 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
235 | set_extent_bits(&root->fs_info->freed_extents[1], | |
236 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
237 | return 0; | |
238 | } | |
817d52f8 | 239 | |
11833d66 YZ |
240 | static void free_excluded_extents(struct btrfs_root *root, |
241 | struct btrfs_block_group_cache *cache) | |
242 | { | |
243 | u64 start, end; | |
817d52f8 | 244 | |
11833d66 YZ |
245 | start = cache->key.objectid; |
246 | end = start + cache->key.offset - 1; | |
247 | ||
248 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
249 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
250 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
251 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
252 | } |
253 | ||
11833d66 YZ |
254 | static int exclude_super_stripes(struct btrfs_root *root, |
255 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 256 | { |
817d52f8 JB |
257 | u64 bytenr; |
258 | u64 *logical; | |
259 | int stripe_len; | |
260 | int i, nr, ret; | |
261 | ||
06b2331f YZ |
262 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
263 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
264 | cache->bytes_super += stripe_len; | |
265 | ret = add_excluded_extent(root, cache->key.objectid, | |
266 | stripe_len); | |
835d974f JB |
267 | if (ret) |
268 | return ret; | |
06b2331f YZ |
269 | } |
270 | ||
817d52f8 JB |
271 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
272 | bytenr = btrfs_sb_offset(i); | |
273 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
274 | cache->key.objectid, bytenr, | |
275 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
276 | if (ret) |
277 | return ret; | |
11833d66 | 278 | |
817d52f8 | 279 | while (nr--) { |
51bf5f0b JB |
280 | u64 start, len; |
281 | ||
282 | if (logical[nr] > cache->key.objectid + | |
283 | cache->key.offset) | |
284 | continue; | |
285 | ||
286 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
287 | continue; | |
288 | ||
289 | start = logical[nr]; | |
290 | if (start < cache->key.objectid) { | |
291 | start = cache->key.objectid; | |
292 | len = (logical[nr] + stripe_len) - start; | |
293 | } else { | |
294 | len = min_t(u64, stripe_len, | |
295 | cache->key.objectid + | |
296 | cache->key.offset - start); | |
297 | } | |
298 | ||
299 | cache->bytes_super += len; | |
300 | ret = add_excluded_extent(root, start, len); | |
835d974f JB |
301 | if (ret) { |
302 | kfree(logical); | |
303 | return ret; | |
304 | } | |
817d52f8 | 305 | } |
11833d66 | 306 | |
817d52f8 JB |
307 | kfree(logical); |
308 | } | |
817d52f8 JB |
309 | return 0; |
310 | } | |
311 | ||
11833d66 YZ |
312 | static struct btrfs_caching_control * |
313 | get_caching_control(struct btrfs_block_group_cache *cache) | |
314 | { | |
315 | struct btrfs_caching_control *ctl; | |
316 | ||
317 | spin_lock(&cache->lock); | |
dde5abee JB |
318 | if (!cache->caching_ctl) { |
319 | spin_unlock(&cache->lock); | |
11833d66 YZ |
320 | return NULL; |
321 | } | |
322 | ||
323 | ctl = cache->caching_ctl; | |
324 | atomic_inc(&ctl->count); | |
325 | spin_unlock(&cache->lock); | |
326 | return ctl; | |
327 | } | |
328 | ||
329 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
330 | { | |
331 | if (atomic_dec_and_test(&ctl->count)) | |
332 | kfree(ctl); | |
333 | } | |
334 | ||
0f9dd46c JB |
335 | /* |
336 | * this is only called by cache_block_group, since we could have freed extents | |
337 | * we need to check the pinned_extents for any extents that can't be used yet | |
338 | * since their free space will be released as soon as the transaction commits. | |
339 | */ | |
817d52f8 | 340 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
341 | struct btrfs_fs_info *info, u64 start, u64 end) |
342 | { | |
817d52f8 | 343 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
344 | int ret; |
345 | ||
346 | while (start < end) { | |
11833d66 | 347 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 348 | &extent_start, &extent_end, |
e6138876 JB |
349 | EXTENT_DIRTY | EXTENT_UPTODATE, |
350 | NULL); | |
0f9dd46c JB |
351 | if (ret) |
352 | break; | |
353 | ||
06b2331f | 354 | if (extent_start <= start) { |
0f9dd46c JB |
355 | start = extent_end + 1; |
356 | } else if (extent_start > start && extent_start < end) { | |
357 | size = extent_start - start; | |
817d52f8 | 358 | total_added += size; |
ea6a478e JB |
359 | ret = btrfs_add_free_space(block_group, start, |
360 | size); | |
79787eaa | 361 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
362 | start = extent_end + 1; |
363 | } else { | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
368 | if (start < end) { | |
369 | size = end - start; | |
817d52f8 | 370 | total_added += size; |
ea6a478e | 371 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 372 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
373 | } |
374 | ||
817d52f8 | 375 | return total_added; |
0f9dd46c JB |
376 | } |
377 | ||
d458b054 | 378 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 379 | { |
bab39bf9 JB |
380 | struct btrfs_block_group_cache *block_group; |
381 | struct btrfs_fs_info *fs_info; | |
382 | struct btrfs_caching_control *caching_ctl; | |
383 | struct btrfs_root *extent_root; | |
e37c9e69 | 384 | struct btrfs_path *path; |
5f39d397 | 385 | struct extent_buffer *leaf; |
11833d66 | 386 | struct btrfs_key key; |
817d52f8 | 387 | u64 total_found = 0; |
11833d66 YZ |
388 | u64 last = 0; |
389 | u32 nritems; | |
36cce922 | 390 | int ret = -ENOMEM; |
f510cfec | 391 | |
bab39bf9 JB |
392 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
393 | block_group = caching_ctl->block_group; | |
394 | fs_info = block_group->fs_info; | |
395 | extent_root = fs_info->extent_root; | |
396 | ||
e37c9e69 CM |
397 | path = btrfs_alloc_path(); |
398 | if (!path) | |
bab39bf9 | 399 | goto out; |
7d7d6068 | 400 | |
817d52f8 | 401 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 402 | |
5cd57b2c | 403 | /* |
817d52f8 JB |
404 | * We don't want to deadlock with somebody trying to allocate a new |
405 | * extent for the extent root while also trying to search the extent | |
406 | * root to add free space. So we skip locking and search the commit | |
407 | * root, since its read-only | |
5cd57b2c CM |
408 | */ |
409 | path->skip_locking = 1; | |
817d52f8 | 410 | path->search_commit_root = 1; |
026fd317 | 411 | path->reada = 1; |
817d52f8 | 412 | |
e4404d6e | 413 | key.objectid = last; |
e37c9e69 | 414 | key.offset = 0; |
11833d66 | 415 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 416 | again: |
11833d66 | 417 | mutex_lock(&caching_ctl->mutex); |
013f1b12 | 418 | /* need to make sure the commit_root doesn't disappear */ |
9e351cc8 | 419 | down_read(&fs_info->commit_root_sem); |
013f1b12 | 420 | |
52ee28d2 | 421 | next: |
11833d66 | 422 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 423 | if (ret < 0) |
ef8bbdfe | 424 | goto err; |
a512bbf8 | 425 | |
11833d66 YZ |
426 | leaf = path->nodes[0]; |
427 | nritems = btrfs_header_nritems(leaf); | |
428 | ||
d397712b | 429 | while (1) { |
7841cb28 | 430 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 431 | last = (u64)-1; |
817d52f8 | 432 | break; |
f25784b3 | 433 | } |
817d52f8 | 434 | |
11833d66 YZ |
435 | if (path->slots[0] < nritems) { |
436 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
437 | } else { | |
438 | ret = find_next_key(path, 0, &key); | |
439 | if (ret) | |
e37c9e69 | 440 | break; |
817d52f8 | 441 | |
c9ea7b24 | 442 | if (need_resched() || |
9e351cc8 | 443 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
589d8ade | 444 | caching_ctl->progress = last; |
ff5714cc | 445 | btrfs_release_path(path); |
9e351cc8 | 446 | up_read(&fs_info->commit_root_sem); |
589d8ade | 447 | mutex_unlock(&caching_ctl->mutex); |
11833d66 | 448 | cond_resched(); |
589d8ade JB |
449 | goto again; |
450 | } | |
0a3896d0 JB |
451 | |
452 | ret = btrfs_next_leaf(extent_root, path); | |
453 | if (ret < 0) | |
454 | goto err; | |
455 | if (ret) | |
456 | break; | |
589d8ade JB |
457 | leaf = path->nodes[0]; |
458 | nritems = btrfs_header_nritems(leaf); | |
459 | continue; | |
11833d66 | 460 | } |
817d52f8 | 461 | |
52ee28d2 LB |
462 | if (key.objectid < last) { |
463 | key.objectid = last; | |
464 | key.offset = 0; | |
465 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
466 | ||
467 | caching_ctl->progress = last; | |
468 | btrfs_release_path(path); | |
469 | goto next; | |
470 | } | |
471 | ||
11833d66 YZ |
472 | if (key.objectid < block_group->key.objectid) { |
473 | path->slots[0]++; | |
817d52f8 | 474 | continue; |
e37c9e69 | 475 | } |
0f9dd46c | 476 | |
e37c9e69 | 477 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 478 | block_group->key.offset) |
e37c9e69 | 479 | break; |
7d7d6068 | 480 | |
3173a18f JB |
481 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
482 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
483 | total_found += add_new_free_space(block_group, |
484 | fs_info, last, | |
485 | key.objectid); | |
3173a18f JB |
486 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
487 | last = key.objectid + | |
707e8a07 | 488 | fs_info->tree_root->nodesize; |
3173a18f JB |
489 | else |
490 | last = key.objectid + key.offset; | |
817d52f8 | 491 | |
11833d66 YZ |
492 | if (total_found > (1024 * 1024 * 2)) { |
493 | total_found = 0; | |
494 | wake_up(&caching_ctl->wait); | |
495 | } | |
817d52f8 | 496 | } |
e37c9e69 CM |
497 | path->slots[0]++; |
498 | } | |
817d52f8 | 499 | ret = 0; |
e37c9e69 | 500 | |
817d52f8 JB |
501 | total_found += add_new_free_space(block_group, fs_info, last, |
502 | block_group->key.objectid + | |
503 | block_group->key.offset); | |
11833d66 | 504 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
505 | |
506 | spin_lock(&block_group->lock); | |
11833d66 | 507 | block_group->caching_ctl = NULL; |
817d52f8 JB |
508 | block_group->cached = BTRFS_CACHE_FINISHED; |
509 | spin_unlock(&block_group->lock); | |
0f9dd46c | 510 | |
54aa1f4d | 511 | err: |
e37c9e69 | 512 | btrfs_free_path(path); |
9e351cc8 | 513 | up_read(&fs_info->commit_root_sem); |
817d52f8 | 514 | |
11833d66 YZ |
515 | free_excluded_extents(extent_root, block_group); |
516 | ||
517 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 518 | out: |
36cce922 JB |
519 | if (ret) { |
520 | spin_lock(&block_group->lock); | |
521 | block_group->caching_ctl = NULL; | |
522 | block_group->cached = BTRFS_CACHE_ERROR; | |
523 | spin_unlock(&block_group->lock); | |
524 | } | |
11833d66 YZ |
525 | wake_up(&caching_ctl->wait); |
526 | ||
527 | put_caching_control(caching_ctl); | |
11dfe35a | 528 | btrfs_put_block_group(block_group); |
817d52f8 JB |
529 | } |
530 | ||
9d66e233 | 531 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 532 | int load_cache_only) |
817d52f8 | 533 | { |
291c7d2f | 534 | DEFINE_WAIT(wait); |
11833d66 YZ |
535 | struct btrfs_fs_info *fs_info = cache->fs_info; |
536 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
537 | int ret = 0; |
538 | ||
291c7d2f | 539 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
540 | if (!caching_ctl) |
541 | return -ENOMEM; | |
291c7d2f JB |
542 | |
543 | INIT_LIST_HEAD(&caching_ctl->list); | |
544 | mutex_init(&caching_ctl->mutex); | |
545 | init_waitqueue_head(&caching_ctl->wait); | |
546 | caching_ctl->block_group = cache; | |
547 | caching_ctl->progress = cache->key.objectid; | |
548 | atomic_set(&caching_ctl->count, 1); | |
9e0af237 LB |
549 | btrfs_init_work(&caching_ctl->work, btrfs_cache_helper, |
550 | caching_thread, NULL, NULL); | |
291c7d2f JB |
551 | |
552 | spin_lock(&cache->lock); | |
553 | /* | |
554 | * This should be a rare occasion, but this could happen I think in the | |
555 | * case where one thread starts to load the space cache info, and then | |
556 | * some other thread starts a transaction commit which tries to do an | |
557 | * allocation while the other thread is still loading the space cache | |
558 | * info. The previous loop should have kept us from choosing this block | |
559 | * group, but if we've moved to the state where we will wait on caching | |
560 | * block groups we need to first check if we're doing a fast load here, | |
561 | * so we can wait for it to finish, otherwise we could end up allocating | |
562 | * from a block group who's cache gets evicted for one reason or | |
563 | * another. | |
564 | */ | |
565 | while (cache->cached == BTRFS_CACHE_FAST) { | |
566 | struct btrfs_caching_control *ctl; | |
567 | ||
568 | ctl = cache->caching_ctl; | |
569 | atomic_inc(&ctl->count); | |
570 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
571 | spin_unlock(&cache->lock); | |
572 | ||
573 | schedule(); | |
574 | ||
575 | finish_wait(&ctl->wait, &wait); | |
576 | put_caching_control(ctl); | |
577 | spin_lock(&cache->lock); | |
578 | } | |
579 | ||
580 | if (cache->cached != BTRFS_CACHE_NO) { | |
581 | spin_unlock(&cache->lock); | |
582 | kfree(caching_ctl); | |
11833d66 | 583 | return 0; |
291c7d2f JB |
584 | } |
585 | WARN_ON(cache->caching_ctl); | |
586 | cache->caching_ctl = caching_ctl; | |
587 | cache->cached = BTRFS_CACHE_FAST; | |
588 | spin_unlock(&cache->lock); | |
11833d66 | 589 | |
d53ba474 | 590 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
cb83b7b8 | 591 | mutex_lock(&caching_ctl->mutex); |
9d66e233 JB |
592 | ret = load_free_space_cache(fs_info, cache); |
593 | ||
594 | spin_lock(&cache->lock); | |
595 | if (ret == 1) { | |
291c7d2f | 596 | cache->caching_ctl = NULL; |
9d66e233 JB |
597 | cache->cached = BTRFS_CACHE_FINISHED; |
598 | cache->last_byte_to_unpin = (u64)-1; | |
cb83b7b8 | 599 | caching_ctl->progress = (u64)-1; |
9d66e233 | 600 | } else { |
291c7d2f JB |
601 | if (load_cache_only) { |
602 | cache->caching_ctl = NULL; | |
603 | cache->cached = BTRFS_CACHE_NO; | |
604 | } else { | |
605 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 606 | cache->has_caching_ctl = 1; |
291c7d2f | 607 | } |
9d66e233 JB |
608 | } |
609 | spin_unlock(&cache->lock); | |
cb83b7b8 JB |
610 | mutex_unlock(&caching_ctl->mutex); |
611 | ||
291c7d2f | 612 | wake_up(&caching_ctl->wait); |
3c14874a | 613 | if (ret == 1) { |
291c7d2f | 614 | put_caching_control(caching_ctl); |
3c14874a | 615 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 616 | return 0; |
3c14874a | 617 | } |
291c7d2f JB |
618 | } else { |
619 | /* | |
620 | * We are not going to do the fast caching, set cached to the | |
621 | * appropriate value and wakeup any waiters. | |
622 | */ | |
623 | spin_lock(&cache->lock); | |
624 | if (load_cache_only) { | |
625 | cache->caching_ctl = NULL; | |
626 | cache->cached = BTRFS_CACHE_NO; | |
627 | } else { | |
628 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 629 | cache->has_caching_ctl = 1; |
291c7d2f JB |
630 | } |
631 | spin_unlock(&cache->lock); | |
632 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
633 | } |
634 | ||
291c7d2f JB |
635 | if (load_cache_only) { |
636 | put_caching_control(caching_ctl); | |
11833d66 | 637 | return 0; |
817d52f8 | 638 | } |
817d52f8 | 639 | |
9e351cc8 | 640 | down_write(&fs_info->commit_root_sem); |
291c7d2f | 641 | atomic_inc(&caching_ctl->count); |
11833d66 | 642 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
9e351cc8 | 643 | up_write(&fs_info->commit_root_sem); |
11833d66 | 644 | |
11dfe35a | 645 | btrfs_get_block_group(cache); |
11833d66 | 646 | |
e66f0bb1 | 647 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 648 | |
ef8bbdfe | 649 | return ret; |
e37c9e69 CM |
650 | } |
651 | ||
0f9dd46c JB |
652 | /* |
653 | * return the block group that starts at or after bytenr | |
654 | */ | |
d397712b CM |
655 | static struct btrfs_block_group_cache * |
656 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 657 | { |
0f9dd46c | 658 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 659 | |
0f9dd46c | 660 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 661 | |
0f9dd46c | 662 | return cache; |
0ef3e66b CM |
663 | } |
664 | ||
0f9dd46c | 665 | /* |
9f55684c | 666 | * return the block group that contains the given bytenr |
0f9dd46c | 667 | */ |
d397712b CM |
668 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
669 | struct btrfs_fs_info *info, | |
670 | u64 bytenr) | |
be744175 | 671 | { |
0f9dd46c | 672 | struct btrfs_block_group_cache *cache; |
be744175 | 673 | |
0f9dd46c | 674 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 675 | |
0f9dd46c | 676 | return cache; |
be744175 | 677 | } |
0b86a832 | 678 | |
0f9dd46c JB |
679 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
680 | u64 flags) | |
6324fbf3 | 681 | { |
0f9dd46c | 682 | struct list_head *head = &info->space_info; |
0f9dd46c | 683 | struct btrfs_space_info *found; |
4184ea7f | 684 | |
52ba6929 | 685 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 686 | |
4184ea7f CM |
687 | rcu_read_lock(); |
688 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 689 | if (found->flags & flags) { |
4184ea7f | 690 | rcu_read_unlock(); |
0f9dd46c | 691 | return found; |
4184ea7f | 692 | } |
0f9dd46c | 693 | } |
4184ea7f | 694 | rcu_read_unlock(); |
0f9dd46c | 695 | return NULL; |
6324fbf3 CM |
696 | } |
697 | ||
4184ea7f CM |
698 | /* |
699 | * after adding space to the filesystem, we need to clear the full flags | |
700 | * on all the space infos. | |
701 | */ | |
702 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
703 | { | |
704 | struct list_head *head = &info->space_info; | |
705 | struct btrfs_space_info *found; | |
706 | ||
707 | rcu_read_lock(); | |
708 | list_for_each_entry_rcu(found, head, list) | |
709 | found->full = 0; | |
710 | rcu_read_unlock(); | |
711 | } | |
712 | ||
1a4ed8fd FM |
713 | /* simple helper to search for an existing data extent at a given offset */ |
714 | int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len) | |
e02119d5 CM |
715 | { |
716 | int ret; | |
717 | struct btrfs_key key; | |
31840ae1 | 718 | struct btrfs_path *path; |
e02119d5 | 719 | |
31840ae1 | 720 | path = btrfs_alloc_path(); |
d8926bb3 MF |
721 | if (!path) |
722 | return -ENOMEM; | |
723 | ||
e02119d5 CM |
724 | key.objectid = start; |
725 | key.offset = len; | |
3173a18f | 726 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
727 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
728 | 0, 0); | |
31840ae1 | 729 | btrfs_free_path(path); |
7bb86316 CM |
730 | return ret; |
731 | } | |
732 | ||
a22285a6 | 733 | /* |
3173a18f | 734 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
735 | * |
736 | * the head node for delayed ref is used to store the sum of all the | |
737 | * reference count modifications queued up in the rbtree. the head | |
738 | * node may also store the extent flags to set. This way you can check | |
739 | * to see what the reference count and extent flags would be if all of | |
740 | * the delayed refs are not processed. | |
741 | */ | |
742 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
743 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 744 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
745 | { |
746 | struct btrfs_delayed_ref_head *head; | |
747 | struct btrfs_delayed_ref_root *delayed_refs; | |
748 | struct btrfs_path *path; | |
749 | struct btrfs_extent_item *ei; | |
750 | struct extent_buffer *leaf; | |
751 | struct btrfs_key key; | |
752 | u32 item_size; | |
753 | u64 num_refs; | |
754 | u64 extent_flags; | |
755 | int ret; | |
756 | ||
3173a18f JB |
757 | /* |
758 | * If we don't have skinny metadata, don't bother doing anything | |
759 | * different | |
760 | */ | |
761 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
707e8a07 | 762 | offset = root->nodesize; |
3173a18f JB |
763 | metadata = 0; |
764 | } | |
765 | ||
a22285a6 YZ |
766 | path = btrfs_alloc_path(); |
767 | if (!path) | |
768 | return -ENOMEM; | |
769 | ||
a22285a6 YZ |
770 | if (!trans) { |
771 | path->skip_locking = 1; | |
772 | path->search_commit_root = 1; | |
773 | } | |
639eefc8 FDBM |
774 | |
775 | search_again: | |
776 | key.objectid = bytenr; | |
777 | key.offset = offset; | |
778 | if (metadata) | |
779 | key.type = BTRFS_METADATA_ITEM_KEY; | |
780 | else | |
781 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
782 | ||
a22285a6 YZ |
783 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, |
784 | &key, path, 0, 0); | |
785 | if (ret < 0) | |
786 | goto out_free; | |
787 | ||
3173a18f | 788 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
789 | if (path->slots[0]) { |
790 | path->slots[0]--; | |
791 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
792 | path->slots[0]); | |
793 | if (key.objectid == bytenr && | |
794 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
707e8a07 | 795 | key.offset == root->nodesize) |
74be9510 FDBM |
796 | ret = 0; |
797 | } | |
3173a18f JB |
798 | } |
799 | ||
a22285a6 YZ |
800 | if (ret == 0) { |
801 | leaf = path->nodes[0]; | |
802 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
803 | if (item_size >= sizeof(*ei)) { | |
804 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
805 | struct btrfs_extent_item); | |
806 | num_refs = btrfs_extent_refs(leaf, ei); | |
807 | extent_flags = btrfs_extent_flags(leaf, ei); | |
808 | } else { | |
809 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
810 | struct btrfs_extent_item_v0 *ei0; | |
811 | BUG_ON(item_size != sizeof(*ei0)); | |
812 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
813 | struct btrfs_extent_item_v0); | |
814 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
815 | /* FIXME: this isn't correct for data */ | |
816 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
817 | #else | |
818 | BUG(); | |
819 | #endif | |
820 | } | |
821 | BUG_ON(num_refs == 0); | |
822 | } else { | |
823 | num_refs = 0; | |
824 | extent_flags = 0; | |
825 | ret = 0; | |
826 | } | |
827 | ||
828 | if (!trans) | |
829 | goto out; | |
830 | ||
831 | delayed_refs = &trans->transaction->delayed_refs; | |
832 | spin_lock(&delayed_refs->lock); | |
833 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
834 | if (head) { | |
835 | if (!mutex_trylock(&head->mutex)) { | |
836 | atomic_inc(&head->node.refs); | |
837 | spin_unlock(&delayed_refs->lock); | |
838 | ||
b3b4aa74 | 839 | btrfs_release_path(path); |
a22285a6 | 840 | |
8cc33e5c DS |
841 | /* |
842 | * Mutex was contended, block until it's released and try | |
843 | * again | |
844 | */ | |
a22285a6 YZ |
845 | mutex_lock(&head->mutex); |
846 | mutex_unlock(&head->mutex); | |
847 | btrfs_put_delayed_ref(&head->node); | |
639eefc8 | 848 | goto search_again; |
a22285a6 | 849 | } |
d7df2c79 | 850 | spin_lock(&head->lock); |
a22285a6 YZ |
851 | if (head->extent_op && head->extent_op->update_flags) |
852 | extent_flags |= head->extent_op->flags_to_set; | |
853 | else | |
854 | BUG_ON(num_refs == 0); | |
855 | ||
856 | num_refs += head->node.ref_mod; | |
d7df2c79 | 857 | spin_unlock(&head->lock); |
a22285a6 YZ |
858 | mutex_unlock(&head->mutex); |
859 | } | |
860 | spin_unlock(&delayed_refs->lock); | |
861 | out: | |
862 | WARN_ON(num_refs == 0); | |
863 | if (refs) | |
864 | *refs = num_refs; | |
865 | if (flags) | |
866 | *flags = extent_flags; | |
867 | out_free: | |
868 | btrfs_free_path(path); | |
869 | return ret; | |
870 | } | |
871 | ||
d8d5f3e1 CM |
872 | /* |
873 | * Back reference rules. Back refs have three main goals: | |
874 | * | |
875 | * 1) differentiate between all holders of references to an extent so that | |
876 | * when a reference is dropped we can make sure it was a valid reference | |
877 | * before freeing the extent. | |
878 | * | |
879 | * 2) Provide enough information to quickly find the holders of an extent | |
880 | * if we notice a given block is corrupted or bad. | |
881 | * | |
882 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
883 | * maintenance. This is actually the same as #2, but with a slightly | |
884 | * different use case. | |
885 | * | |
5d4f98a2 YZ |
886 | * There are two kinds of back refs. The implicit back refs is optimized |
887 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
888 | * back refs of this kind provide information about the block's owner tree | |
889 | * and the pointer's key. These information allow us to find the block by | |
890 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
891 | * referenced by their owner trees. The location of tree block is recorded | |
892 | * in the back refs. Actually the full back refs is generic, and can be | |
893 | * used in all cases the implicit back refs is used. The major shortcoming | |
894 | * of the full back refs is its overhead. Every time a tree block gets | |
895 | * COWed, we have to update back refs entry for all pointers in it. | |
896 | * | |
897 | * For a newly allocated tree block, we use implicit back refs for | |
898 | * pointers in it. This means most tree related operations only involve | |
899 | * implicit back refs. For a tree block created in old transaction, the | |
900 | * only way to drop a reference to it is COW it. So we can detect the | |
901 | * event that tree block loses its owner tree's reference and do the | |
902 | * back refs conversion. | |
903 | * | |
904 | * When a tree block is COW'd through a tree, there are four cases: | |
905 | * | |
906 | * The reference count of the block is one and the tree is the block's | |
907 | * owner tree. Nothing to do in this case. | |
908 | * | |
909 | * The reference count of the block is one and the tree is not the | |
910 | * block's owner tree. In this case, full back refs is used for pointers | |
911 | * in the block. Remove these full back refs, add implicit back refs for | |
912 | * every pointers in the new block. | |
913 | * | |
914 | * The reference count of the block is greater than one and the tree is | |
915 | * the block's owner tree. In this case, implicit back refs is used for | |
916 | * pointers in the block. Add full back refs for every pointers in the | |
917 | * block, increase lower level extents' reference counts. The original | |
918 | * implicit back refs are entailed to the new block. | |
919 | * | |
920 | * The reference count of the block is greater than one and the tree is | |
921 | * not the block's owner tree. Add implicit back refs for every pointer in | |
922 | * the new block, increase lower level extents' reference count. | |
923 | * | |
924 | * Back Reference Key composing: | |
925 | * | |
926 | * The key objectid corresponds to the first byte in the extent, | |
927 | * The key type is used to differentiate between types of back refs. | |
928 | * There are different meanings of the key offset for different types | |
929 | * of back refs. | |
930 | * | |
d8d5f3e1 CM |
931 | * File extents can be referenced by: |
932 | * | |
933 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 934 | * - different files inside a single subvolume |
d8d5f3e1 CM |
935 | * - different offsets inside a file (bookend extents in file.c) |
936 | * | |
5d4f98a2 | 937 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
938 | * |
939 | * - Objectid of the subvolume root | |
d8d5f3e1 | 940 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
941 | * - original offset in the file |
942 | * - how many bookend extents | |
d8d5f3e1 | 943 | * |
5d4f98a2 YZ |
944 | * The key offset for the implicit back refs is hash of the first |
945 | * three fields. | |
d8d5f3e1 | 946 | * |
5d4f98a2 | 947 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 948 | * |
5d4f98a2 | 949 | * - number of pointers in the tree leaf |
d8d5f3e1 | 950 | * |
5d4f98a2 YZ |
951 | * The key offset for the implicit back refs is the first byte of |
952 | * the tree leaf | |
d8d5f3e1 | 953 | * |
5d4f98a2 YZ |
954 | * When a file extent is allocated, The implicit back refs is used. |
955 | * the fields are filled in: | |
d8d5f3e1 | 956 | * |
5d4f98a2 | 957 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 958 | * |
5d4f98a2 YZ |
959 | * When a file extent is removed file truncation, we find the |
960 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 961 | * |
5d4f98a2 | 962 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 963 | * |
5d4f98a2 | 964 | * Btree extents can be referenced by: |
d8d5f3e1 | 965 | * |
5d4f98a2 | 966 | * - Different subvolumes |
d8d5f3e1 | 967 | * |
5d4f98a2 YZ |
968 | * Both the implicit back refs and the full back refs for tree blocks |
969 | * only consist of key. The key offset for the implicit back refs is | |
970 | * objectid of block's owner tree. The key offset for the full back refs | |
971 | * is the first byte of parent block. | |
d8d5f3e1 | 972 | * |
5d4f98a2 YZ |
973 | * When implicit back refs is used, information about the lowest key and |
974 | * level of the tree block are required. These information are stored in | |
975 | * tree block info structure. | |
d8d5f3e1 | 976 | */ |
31840ae1 | 977 | |
5d4f98a2 YZ |
978 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
979 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
980 | struct btrfs_root *root, | |
981 | struct btrfs_path *path, | |
982 | u64 owner, u32 extra_size) | |
7bb86316 | 983 | { |
5d4f98a2 YZ |
984 | struct btrfs_extent_item *item; |
985 | struct btrfs_extent_item_v0 *ei0; | |
986 | struct btrfs_extent_ref_v0 *ref0; | |
987 | struct btrfs_tree_block_info *bi; | |
988 | struct extent_buffer *leaf; | |
7bb86316 | 989 | struct btrfs_key key; |
5d4f98a2 YZ |
990 | struct btrfs_key found_key; |
991 | u32 new_size = sizeof(*item); | |
992 | u64 refs; | |
993 | int ret; | |
994 | ||
995 | leaf = path->nodes[0]; | |
996 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
997 | ||
998 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
999 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1000 | struct btrfs_extent_item_v0); | |
1001 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1002 | ||
1003 | if (owner == (u64)-1) { | |
1004 | while (1) { | |
1005 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1006 | ret = btrfs_next_leaf(root, path); | |
1007 | if (ret < 0) | |
1008 | return ret; | |
79787eaa | 1009 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1010 | leaf = path->nodes[0]; |
1011 | } | |
1012 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1013 | path->slots[0]); | |
1014 | BUG_ON(key.objectid != found_key.objectid); | |
1015 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1016 | path->slots[0]++; | |
1017 | continue; | |
1018 | } | |
1019 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1020 | struct btrfs_extent_ref_v0); | |
1021 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1022 | break; | |
1023 | } | |
1024 | } | |
b3b4aa74 | 1025 | btrfs_release_path(path); |
5d4f98a2 YZ |
1026 | |
1027 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1028 | new_size += sizeof(*bi); | |
1029 | ||
1030 | new_size -= sizeof(*ei0); | |
1031 | ret = btrfs_search_slot(trans, root, &key, path, | |
1032 | new_size + extra_size, 1); | |
1033 | if (ret < 0) | |
1034 | return ret; | |
79787eaa | 1035 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1036 | |
4b90c680 | 1037 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1038 | |
1039 | leaf = path->nodes[0]; | |
1040 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1041 | btrfs_set_extent_refs(leaf, item, refs); | |
1042 | /* FIXME: get real generation */ | |
1043 | btrfs_set_extent_generation(leaf, item, 0); | |
1044 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1045 | btrfs_set_extent_flags(leaf, item, | |
1046 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1047 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1048 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1049 | /* FIXME: get first key of the block */ | |
1050 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1051 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1052 | } else { | |
1053 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1054 | } | |
1055 | btrfs_mark_buffer_dirty(leaf); | |
1056 | return 0; | |
1057 | } | |
1058 | #endif | |
1059 | ||
1060 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1061 | { | |
1062 | u32 high_crc = ~(u32)0; | |
1063 | u32 low_crc = ~(u32)0; | |
1064 | __le64 lenum; | |
1065 | ||
1066 | lenum = cpu_to_le64(root_objectid); | |
14a958e6 | 1067 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1068 | lenum = cpu_to_le64(owner); |
14a958e6 | 1069 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1070 | lenum = cpu_to_le64(offset); |
14a958e6 | 1071 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1072 | |
1073 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1074 | } | |
1075 | ||
1076 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1077 | struct btrfs_extent_data_ref *ref) | |
1078 | { | |
1079 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1080 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1081 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1082 | } | |
1083 | ||
1084 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1085 | struct btrfs_extent_data_ref *ref, | |
1086 | u64 root_objectid, u64 owner, u64 offset) | |
1087 | { | |
1088 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1089 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1090 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1091 | return 0; | |
1092 | return 1; | |
1093 | } | |
1094 | ||
1095 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1096 | struct btrfs_root *root, | |
1097 | struct btrfs_path *path, | |
1098 | u64 bytenr, u64 parent, | |
1099 | u64 root_objectid, | |
1100 | u64 owner, u64 offset) | |
1101 | { | |
1102 | struct btrfs_key key; | |
1103 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1104 | struct extent_buffer *leaf; |
5d4f98a2 | 1105 | u32 nritems; |
74493f7a | 1106 | int ret; |
5d4f98a2 YZ |
1107 | int recow; |
1108 | int err = -ENOENT; | |
74493f7a | 1109 | |
31840ae1 | 1110 | key.objectid = bytenr; |
5d4f98a2 YZ |
1111 | if (parent) { |
1112 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1113 | key.offset = parent; | |
1114 | } else { | |
1115 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1116 | key.offset = hash_extent_data_ref(root_objectid, | |
1117 | owner, offset); | |
1118 | } | |
1119 | again: | |
1120 | recow = 0; | |
1121 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1122 | if (ret < 0) { | |
1123 | err = ret; | |
1124 | goto fail; | |
1125 | } | |
31840ae1 | 1126 | |
5d4f98a2 YZ |
1127 | if (parent) { |
1128 | if (!ret) | |
1129 | return 0; | |
1130 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1131 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1132 | btrfs_release_path(path); |
5d4f98a2 YZ |
1133 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1134 | if (ret < 0) { | |
1135 | err = ret; | |
1136 | goto fail; | |
1137 | } | |
1138 | if (!ret) | |
1139 | return 0; | |
1140 | #endif | |
1141 | goto fail; | |
31840ae1 ZY |
1142 | } |
1143 | ||
1144 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1145 | nritems = btrfs_header_nritems(leaf); |
1146 | while (1) { | |
1147 | if (path->slots[0] >= nritems) { | |
1148 | ret = btrfs_next_leaf(root, path); | |
1149 | if (ret < 0) | |
1150 | err = ret; | |
1151 | if (ret) | |
1152 | goto fail; | |
1153 | ||
1154 | leaf = path->nodes[0]; | |
1155 | nritems = btrfs_header_nritems(leaf); | |
1156 | recow = 1; | |
1157 | } | |
1158 | ||
1159 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1160 | if (key.objectid != bytenr || | |
1161 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1162 | goto fail; | |
1163 | ||
1164 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1165 | struct btrfs_extent_data_ref); | |
1166 | ||
1167 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1168 | owner, offset)) { | |
1169 | if (recow) { | |
b3b4aa74 | 1170 | btrfs_release_path(path); |
5d4f98a2 YZ |
1171 | goto again; |
1172 | } | |
1173 | err = 0; | |
1174 | break; | |
1175 | } | |
1176 | path->slots[0]++; | |
31840ae1 | 1177 | } |
5d4f98a2 YZ |
1178 | fail: |
1179 | return err; | |
31840ae1 ZY |
1180 | } |
1181 | ||
5d4f98a2 YZ |
1182 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1183 | struct btrfs_root *root, | |
1184 | struct btrfs_path *path, | |
1185 | u64 bytenr, u64 parent, | |
1186 | u64 root_objectid, u64 owner, | |
1187 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1188 | { |
1189 | struct btrfs_key key; | |
1190 | struct extent_buffer *leaf; | |
5d4f98a2 | 1191 | u32 size; |
31840ae1 ZY |
1192 | u32 num_refs; |
1193 | int ret; | |
74493f7a | 1194 | |
74493f7a | 1195 | key.objectid = bytenr; |
5d4f98a2 YZ |
1196 | if (parent) { |
1197 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1198 | key.offset = parent; | |
1199 | size = sizeof(struct btrfs_shared_data_ref); | |
1200 | } else { | |
1201 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1202 | key.offset = hash_extent_data_ref(root_objectid, | |
1203 | owner, offset); | |
1204 | size = sizeof(struct btrfs_extent_data_ref); | |
1205 | } | |
74493f7a | 1206 | |
5d4f98a2 YZ |
1207 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1208 | if (ret && ret != -EEXIST) | |
1209 | goto fail; | |
1210 | ||
1211 | leaf = path->nodes[0]; | |
1212 | if (parent) { | |
1213 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1214 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1215 | struct btrfs_shared_data_ref); |
1216 | if (ret == 0) { | |
1217 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1218 | } else { | |
1219 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1220 | num_refs += refs_to_add; | |
1221 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1222 | } |
5d4f98a2 YZ |
1223 | } else { |
1224 | struct btrfs_extent_data_ref *ref; | |
1225 | while (ret == -EEXIST) { | |
1226 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1227 | struct btrfs_extent_data_ref); | |
1228 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1229 | owner, offset)) | |
1230 | break; | |
b3b4aa74 | 1231 | btrfs_release_path(path); |
5d4f98a2 YZ |
1232 | key.offset++; |
1233 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1234 | size); | |
1235 | if (ret && ret != -EEXIST) | |
1236 | goto fail; | |
31840ae1 | 1237 | |
5d4f98a2 YZ |
1238 | leaf = path->nodes[0]; |
1239 | } | |
1240 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1241 | struct btrfs_extent_data_ref); | |
1242 | if (ret == 0) { | |
1243 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1244 | root_objectid); | |
1245 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1246 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1247 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1248 | } else { | |
1249 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1250 | num_refs += refs_to_add; | |
1251 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1252 | } |
31840ae1 | 1253 | } |
5d4f98a2 YZ |
1254 | btrfs_mark_buffer_dirty(leaf); |
1255 | ret = 0; | |
1256 | fail: | |
b3b4aa74 | 1257 | btrfs_release_path(path); |
7bb86316 | 1258 | return ret; |
74493f7a CM |
1259 | } |
1260 | ||
5d4f98a2 YZ |
1261 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1262 | struct btrfs_root *root, | |
1263 | struct btrfs_path *path, | |
fcebe456 | 1264 | int refs_to_drop, int *last_ref) |
31840ae1 | 1265 | { |
5d4f98a2 YZ |
1266 | struct btrfs_key key; |
1267 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1268 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1269 | struct extent_buffer *leaf; |
5d4f98a2 | 1270 | u32 num_refs = 0; |
31840ae1 ZY |
1271 | int ret = 0; |
1272 | ||
1273 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1274 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1275 | ||
1276 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1277 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1278 | struct btrfs_extent_data_ref); | |
1279 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1280 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1281 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1282 | struct btrfs_shared_data_ref); | |
1283 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1284 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1285 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1286 | struct btrfs_extent_ref_v0 *ref0; | |
1287 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1288 | struct btrfs_extent_ref_v0); | |
1289 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1290 | #endif | |
1291 | } else { | |
1292 | BUG(); | |
1293 | } | |
1294 | ||
56bec294 CM |
1295 | BUG_ON(num_refs < refs_to_drop); |
1296 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1297 | |
31840ae1 ZY |
1298 | if (num_refs == 0) { |
1299 | ret = btrfs_del_item(trans, root, path); | |
fcebe456 | 1300 | *last_ref = 1; |
31840ae1 | 1301 | } else { |
5d4f98a2 YZ |
1302 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1303 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1304 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1305 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1306 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1307 | else { | |
1308 | struct btrfs_extent_ref_v0 *ref0; | |
1309 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1310 | struct btrfs_extent_ref_v0); | |
1311 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1312 | } | |
1313 | #endif | |
31840ae1 ZY |
1314 | btrfs_mark_buffer_dirty(leaf); |
1315 | } | |
31840ae1 ZY |
1316 | return ret; |
1317 | } | |
1318 | ||
9ed0dea0 | 1319 | static noinline u32 extent_data_ref_count(struct btrfs_path *path, |
5d4f98a2 | 1320 | struct btrfs_extent_inline_ref *iref) |
15916de8 | 1321 | { |
5d4f98a2 YZ |
1322 | struct btrfs_key key; |
1323 | struct extent_buffer *leaf; | |
1324 | struct btrfs_extent_data_ref *ref1; | |
1325 | struct btrfs_shared_data_ref *ref2; | |
1326 | u32 num_refs = 0; | |
1327 | ||
1328 | leaf = path->nodes[0]; | |
1329 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1330 | if (iref) { | |
1331 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1332 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1333 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1334 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1335 | } else { | |
1336 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1337 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1338 | } | |
1339 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1340 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1341 | struct btrfs_extent_data_ref); | |
1342 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1343 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1344 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1345 | struct btrfs_shared_data_ref); | |
1346 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1347 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1348 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1349 | struct btrfs_extent_ref_v0 *ref0; | |
1350 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1351 | struct btrfs_extent_ref_v0); | |
1352 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1353 | #endif |
5d4f98a2 YZ |
1354 | } else { |
1355 | WARN_ON(1); | |
1356 | } | |
1357 | return num_refs; | |
1358 | } | |
15916de8 | 1359 | |
5d4f98a2 YZ |
1360 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1361 | struct btrfs_root *root, | |
1362 | struct btrfs_path *path, | |
1363 | u64 bytenr, u64 parent, | |
1364 | u64 root_objectid) | |
1f3c79a2 | 1365 | { |
5d4f98a2 | 1366 | struct btrfs_key key; |
1f3c79a2 | 1367 | int ret; |
1f3c79a2 | 1368 | |
5d4f98a2 YZ |
1369 | key.objectid = bytenr; |
1370 | if (parent) { | |
1371 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1372 | key.offset = parent; | |
1373 | } else { | |
1374 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1375 | key.offset = root_objectid; | |
1f3c79a2 LH |
1376 | } |
1377 | ||
5d4f98a2 YZ |
1378 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1379 | if (ret > 0) | |
1380 | ret = -ENOENT; | |
1381 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1382 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1383 | btrfs_release_path(path); |
5d4f98a2 YZ |
1384 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1385 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1386 | if (ret > 0) | |
1387 | ret = -ENOENT; | |
1388 | } | |
1f3c79a2 | 1389 | #endif |
5d4f98a2 | 1390 | return ret; |
1f3c79a2 LH |
1391 | } |
1392 | ||
5d4f98a2 YZ |
1393 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1394 | struct btrfs_root *root, | |
1395 | struct btrfs_path *path, | |
1396 | u64 bytenr, u64 parent, | |
1397 | u64 root_objectid) | |
31840ae1 | 1398 | { |
5d4f98a2 | 1399 | struct btrfs_key key; |
31840ae1 | 1400 | int ret; |
31840ae1 | 1401 | |
5d4f98a2 YZ |
1402 | key.objectid = bytenr; |
1403 | if (parent) { | |
1404 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1405 | key.offset = parent; | |
1406 | } else { | |
1407 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1408 | key.offset = root_objectid; | |
1409 | } | |
1410 | ||
1411 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1412 | btrfs_release_path(path); |
31840ae1 ZY |
1413 | return ret; |
1414 | } | |
1415 | ||
5d4f98a2 | 1416 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1417 | { |
5d4f98a2 YZ |
1418 | int type; |
1419 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1420 | if (parent > 0) | |
1421 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1422 | else | |
1423 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1424 | } else { | |
1425 | if (parent > 0) | |
1426 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1427 | else | |
1428 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1429 | } | |
1430 | return type; | |
31840ae1 | 1431 | } |
56bec294 | 1432 | |
2c47e605 YZ |
1433 | static int find_next_key(struct btrfs_path *path, int level, |
1434 | struct btrfs_key *key) | |
56bec294 | 1435 | |
02217ed2 | 1436 | { |
2c47e605 | 1437 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1438 | if (!path->nodes[level]) |
1439 | break; | |
5d4f98a2 YZ |
1440 | if (path->slots[level] + 1 >= |
1441 | btrfs_header_nritems(path->nodes[level])) | |
1442 | continue; | |
1443 | if (level == 0) | |
1444 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1445 | path->slots[level] + 1); | |
1446 | else | |
1447 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1448 | path->slots[level] + 1); | |
1449 | return 0; | |
1450 | } | |
1451 | return 1; | |
1452 | } | |
037e6390 | 1453 | |
5d4f98a2 YZ |
1454 | /* |
1455 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1456 | * to the address of inline back ref, and 0 is returned. | |
1457 | * | |
1458 | * if back ref isn't found, *ref_ret is set to the address where it | |
1459 | * should be inserted, and -ENOENT is returned. | |
1460 | * | |
1461 | * if insert is true and there are too many inline back refs, the path | |
1462 | * points to the extent item, and -EAGAIN is returned. | |
1463 | * | |
1464 | * NOTE: inline back refs are ordered in the same way that back ref | |
1465 | * items in the tree are ordered. | |
1466 | */ | |
1467 | static noinline_for_stack | |
1468 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1469 | struct btrfs_root *root, | |
1470 | struct btrfs_path *path, | |
1471 | struct btrfs_extent_inline_ref **ref_ret, | |
1472 | u64 bytenr, u64 num_bytes, | |
1473 | u64 parent, u64 root_objectid, | |
1474 | u64 owner, u64 offset, int insert) | |
1475 | { | |
1476 | struct btrfs_key key; | |
1477 | struct extent_buffer *leaf; | |
1478 | struct btrfs_extent_item *ei; | |
1479 | struct btrfs_extent_inline_ref *iref; | |
1480 | u64 flags; | |
1481 | u64 item_size; | |
1482 | unsigned long ptr; | |
1483 | unsigned long end; | |
1484 | int extra_size; | |
1485 | int type; | |
1486 | int want; | |
1487 | int ret; | |
1488 | int err = 0; | |
3173a18f JB |
1489 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1490 | SKINNY_METADATA); | |
26b8003f | 1491 | |
db94535d | 1492 | key.objectid = bytenr; |
31840ae1 | 1493 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1494 | key.offset = num_bytes; |
31840ae1 | 1495 | |
5d4f98a2 YZ |
1496 | want = extent_ref_type(parent, owner); |
1497 | if (insert) { | |
1498 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1499 | path->keep_locks = 1; |
5d4f98a2 YZ |
1500 | } else |
1501 | extra_size = -1; | |
3173a18f JB |
1502 | |
1503 | /* | |
1504 | * Owner is our parent level, so we can just add one to get the level | |
1505 | * for the block we are interested in. | |
1506 | */ | |
1507 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1508 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1509 | key.offset = owner; | |
1510 | } | |
1511 | ||
1512 | again: | |
5d4f98a2 | 1513 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1514 | if (ret < 0) { |
5d4f98a2 YZ |
1515 | err = ret; |
1516 | goto out; | |
1517 | } | |
3173a18f JB |
1518 | |
1519 | /* | |
1520 | * We may be a newly converted file system which still has the old fat | |
1521 | * extent entries for metadata, so try and see if we have one of those. | |
1522 | */ | |
1523 | if (ret > 0 && skinny_metadata) { | |
1524 | skinny_metadata = false; | |
1525 | if (path->slots[0]) { | |
1526 | path->slots[0]--; | |
1527 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1528 | path->slots[0]); | |
1529 | if (key.objectid == bytenr && | |
1530 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1531 | key.offset == num_bytes) | |
1532 | ret = 0; | |
1533 | } | |
1534 | if (ret) { | |
9ce49a0b | 1535 | key.objectid = bytenr; |
3173a18f JB |
1536 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1537 | key.offset = num_bytes; | |
1538 | btrfs_release_path(path); | |
1539 | goto again; | |
1540 | } | |
1541 | } | |
1542 | ||
79787eaa JM |
1543 | if (ret && !insert) { |
1544 | err = -ENOENT; | |
1545 | goto out; | |
fae7f21c | 1546 | } else if (WARN_ON(ret)) { |
492104c8 | 1547 | err = -EIO; |
492104c8 | 1548 | goto out; |
79787eaa | 1549 | } |
5d4f98a2 YZ |
1550 | |
1551 | leaf = path->nodes[0]; | |
1552 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1553 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1554 | if (item_size < sizeof(*ei)) { | |
1555 | if (!insert) { | |
1556 | err = -ENOENT; | |
1557 | goto out; | |
1558 | } | |
1559 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1560 | extra_size); | |
1561 | if (ret < 0) { | |
1562 | err = ret; | |
1563 | goto out; | |
1564 | } | |
1565 | leaf = path->nodes[0]; | |
1566 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1567 | } | |
1568 | #endif | |
1569 | BUG_ON(item_size < sizeof(*ei)); | |
1570 | ||
5d4f98a2 YZ |
1571 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1572 | flags = btrfs_extent_flags(leaf, ei); | |
1573 | ||
1574 | ptr = (unsigned long)(ei + 1); | |
1575 | end = (unsigned long)ei + item_size; | |
1576 | ||
3173a18f | 1577 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1578 | ptr += sizeof(struct btrfs_tree_block_info); |
1579 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1580 | } |
1581 | ||
1582 | err = -ENOENT; | |
1583 | while (1) { | |
1584 | if (ptr >= end) { | |
1585 | WARN_ON(ptr > end); | |
1586 | break; | |
1587 | } | |
1588 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1589 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1590 | if (want < type) | |
1591 | break; | |
1592 | if (want > type) { | |
1593 | ptr += btrfs_extent_inline_ref_size(type); | |
1594 | continue; | |
1595 | } | |
1596 | ||
1597 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1598 | struct btrfs_extent_data_ref *dref; | |
1599 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1600 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1601 | owner, offset)) { | |
1602 | err = 0; | |
1603 | break; | |
1604 | } | |
1605 | if (hash_extent_data_ref_item(leaf, dref) < | |
1606 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1607 | break; | |
1608 | } else { | |
1609 | u64 ref_offset; | |
1610 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1611 | if (parent > 0) { | |
1612 | if (parent == ref_offset) { | |
1613 | err = 0; | |
1614 | break; | |
1615 | } | |
1616 | if (ref_offset < parent) | |
1617 | break; | |
1618 | } else { | |
1619 | if (root_objectid == ref_offset) { | |
1620 | err = 0; | |
1621 | break; | |
1622 | } | |
1623 | if (ref_offset < root_objectid) | |
1624 | break; | |
1625 | } | |
1626 | } | |
1627 | ptr += btrfs_extent_inline_ref_size(type); | |
1628 | } | |
1629 | if (err == -ENOENT && insert) { | |
1630 | if (item_size + extra_size >= | |
1631 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1632 | err = -EAGAIN; | |
1633 | goto out; | |
1634 | } | |
1635 | /* | |
1636 | * To add new inline back ref, we have to make sure | |
1637 | * there is no corresponding back ref item. | |
1638 | * For simplicity, we just do not add new inline back | |
1639 | * ref if there is any kind of item for this block | |
1640 | */ | |
2c47e605 YZ |
1641 | if (find_next_key(path, 0, &key) == 0 && |
1642 | key.objectid == bytenr && | |
85d4198e | 1643 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1644 | err = -EAGAIN; |
1645 | goto out; | |
1646 | } | |
1647 | } | |
1648 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1649 | out: | |
85d4198e | 1650 | if (insert) { |
5d4f98a2 YZ |
1651 | path->keep_locks = 0; |
1652 | btrfs_unlock_up_safe(path, 1); | |
1653 | } | |
1654 | return err; | |
1655 | } | |
1656 | ||
1657 | /* | |
1658 | * helper to add new inline back ref | |
1659 | */ | |
1660 | static noinline_for_stack | |
fd279fae | 1661 | void setup_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1662 | struct btrfs_path *path, |
1663 | struct btrfs_extent_inline_ref *iref, | |
1664 | u64 parent, u64 root_objectid, | |
1665 | u64 owner, u64 offset, int refs_to_add, | |
1666 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1667 | { |
1668 | struct extent_buffer *leaf; | |
1669 | struct btrfs_extent_item *ei; | |
1670 | unsigned long ptr; | |
1671 | unsigned long end; | |
1672 | unsigned long item_offset; | |
1673 | u64 refs; | |
1674 | int size; | |
1675 | int type; | |
5d4f98a2 YZ |
1676 | |
1677 | leaf = path->nodes[0]; | |
1678 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1679 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1680 | ||
1681 | type = extent_ref_type(parent, owner); | |
1682 | size = btrfs_extent_inline_ref_size(type); | |
1683 | ||
4b90c680 | 1684 | btrfs_extend_item(root, path, size); |
5d4f98a2 YZ |
1685 | |
1686 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1687 | refs = btrfs_extent_refs(leaf, ei); | |
1688 | refs += refs_to_add; | |
1689 | btrfs_set_extent_refs(leaf, ei, refs); | |
1690 | if (extent_op) | |
1691 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1692 | ||
1693 | ptr = (unsigned long)ei + item_offset; | |
1694 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1695 | if (ptr < end - size) | |
1696 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1697 | end - size - ptr); | |
1698 | ||
1699 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1700 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1701 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1702 | struct btrfs_extent_data_ref *dref; | |
1703 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1704 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1705 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1706 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1707 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1708 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1709 | struct btrfs_shared_data_ref *sref; | |
1710 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1711 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1712 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1713 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1714 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1715 | } else { | |
1716 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1717 | } | |
1718 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1719 | } |
1720 | ||
1721 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1722 | struct btrfs_root *root, | |
1723 | struct btrfs_path *path, | |
1724 | struct btrfs_extent_inline_ref **ref_ret, | |
1725 | u64 bytenr, u64 num_bytes, u64 parent, | |
1726 | u64 root_objectid, u64 owner, u64 offset) | |
1727 | { | |
1728 | int ret; | |
1729 | ||
1730 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1731 | bytenr, num_bytes, parent, | |
1732 | root_objectid, owner, offset, 0); | |
1733 | if (ret != -ENOENT) | |
54aa1f4d | 1734 | return ret; |
5d4f98a2 | 1735 | |
b3b4aa74 | 1736 | btrfs_release_path(path); |
5d4f98a2 YZ |
1737 | *ref_ret = NULL; |
1738 | ||
1739 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1740 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1741 | root_objectid); | |
1742 | } else { | |
1743 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1744 | root_objectid, owner, offset); | |
b9473439 | 1745 | } |
5d4f98a2 YZ |
1746 | return ret; |
1747 | } | |
31840ae1 | 1748 | |
5d4f98a2 YZ |
1749 | /* |
1750 | * helper to update/remove inline back ref | |
1751 | */ | |
1752 | static noinline_for_stack | |
afe5fea7 | 1753 | void update_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1754 | struct btrfs_path *path, |
1755 | struct btrfs_extent_inline_ref *iref, | |
1756 | int refs_to_mod, | |
fcebe456 JB |
1757 | struct btrfs_delayed_extent_op *extent_op, |
1758 | int *last_ref) | |
5d4f98a2 YZ |
1759 | { |
1760 | struct extent_buffer *leaf; | |
1761 | struct btrfs_extent_item *ei; | |
1762 | struct btrfs_extent_data_ref *dref = NULL; | |
1763 | struct btrfs_shared_data_ref *sref = NULL; | |
1764 | unsigned long ptr; | |
1765 | unsigned long end; | |
1766 | u32 item_size; | |
1767 | int size; | |
1768 | int type; | |
5d4f98a2 YZ |
1769 | u64 refs; |
1770 | ||
1771 | leaf = path->nodes[0]; | |
1772 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1773 | refs = btrfs_extent_refs(leaf, ei); | |
1774 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1775 | refs += refs_to_mod; | |
1776 | btrfs_set_extent_refs(leaf, ei, refs); | |
1777 | if (extent_op) | |
1778 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1779 | ||
1780 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1781 | ||
1782 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1783 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1784 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1785 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1786 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1787 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1788 | } else { | |
1789 | refs = 1; | |
1790 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1791 | } |
31840ae1 | 1792 | |
5d4f98a2 YZ |
1793 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1794 | refs += refs_to_mod; | |
1795 | ||
1796 | if (refs > 0) { | |
1797 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1798 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1799 | else | |
1800 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1801 | } else { | |
fcebe456 | 1802 | *last_ref = 1; |
5d4f98a2 YZ |
1803 | size = btrfs_extent_inline_ref_size(type); |
1804 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1805 | ptr = (unsigned long)iref; | |
1806 | end = (unsigned long)ei + item_size; | |
1807 | if (ptr + size < end) | |
1808 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1809 | end - ptr - size); | |
1810 | item_size -= size; | |
afe5fea7 | 1811 | btrfs_truncate_item(root, path, item_size, 1); |
5d4f98a2 YZ |
1812 | } |
1813 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1814 | } |
1815 | ||
1816 | static noinline_for_stack | |
1817 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1818 | struct btrfs_root *root, | |
1819 | struct btrfs_path *path, | |
1820 | u64 bytenr, u64 num_bytes, u64 parent, | |
1821 | u64 root_objectid, u64 owner, | |
1822 | u64 offset, int refs_to_add, | |
1823 | struct btrfs_delayed_extent_op *extent_op) | |
1824 | { | |
1825 | struct btrfs_extent_inline_ref *iref; | |
1826 | int ret; | |
1827 | ||
1828 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1829 | bytenr, num_bytes, parent, | |
1830 | root_objectid, owner, offset, 1); | |
1831 | if (ret == 0) { | |
1832 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
afe5fea7 | 1833 | update_inline_extent_backref(root, path, iref, |
fcebe456 | 1834 | refs_to_add, extent_op, NULL); |
5d4f98a2 | 1835 | } else if (ret == -ENOENT) { |
fd279fae | 1836 | setup_inline_extent_backref(root, path, iref, parent, |
143bede5 JM |
1837 | root_objectid, owner, offset, |
1838 | refs_to_add, extent_op); | |
1839 | ret = 0; | |
771ed689 | 1840 | } |
5d4f98a2 YZ |
1841 | return ret; |
1842 | } | |
31840ae1 | 1843 | |
5d4f98a2 YZ |
1844 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1845 | struct btrfs_root *root, | |
1846 | struct btrfs_path *path, | |
1847 | u64 bytenr, u64 parent, u64 root_objectid, | |
1848 | u64 owner, u64 offset, int refs_to_add) | |
1849 | { | |
1850 | int ret; | |
1851 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1852 | BUG_ON(refs_to_add != 1); | |
1853 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1854 | parent, root_objectid); | |
1855 | } else { | |
1856 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1857 | parent, root_objectid, | |
1858 | owner, offset, refs_to_add); | |
1859 | } | |
1860 | return ret; | |
1861 | } | |
56bec294 | 1862 | |
5d4f98a2 YZ |
1863 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1864 | struct btrfs_root *root, | |
1865 | struct btrfs_path *path, | |
1866 | struct btrfs_extent_inline_ref *iref, | |
fcebe456 | 1867 | int refs_to_drop, int is_data, int *last_ref) |
5d4f98a2 | 1868 | { |
143bede5 | 1869 | int ret = 0; |
b9473439 | 1870 | |
5d4f98a2 YZ |
1871 | BUG_ON(!is_data && refs_to_drop != 1); |
1872 | if (iref) { | |
afe5fea7 | 1873 | update_inline_extent_backref(root, path, iref, |
fcebe456 | 1874 | -refs_to_drop, NULL, last_ref); |
5d4f98a2 | 1875 | } else if (is_data) { |
fcebe456 JB |
1876 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop, |
1877 | last_ref); | |
5d4f98a2 | 1878 | } else { |
fcebe456 | 1879 | *last_ref = 1; |
5d4f98a2 YZ |
1880 | ret = btrfs_del_item(trans, root, path); |
1881 | } | |
1882 | return ret; | |
1883 | } | |
1884 | ||
86557861 | 1885 | #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) |
d04c6b88 JM |
1886 | static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len, |
1887 | u64 *discarded_bytes) | |
5d4f98a2 | 1888 | { |
86557861 JM |
1889 | int j, ret = 0; |
1890 | u64 bytes_left, end; | |
4d89d377 | 1891 | u64 aligned_start = ALIGN(start, 1 << 9); |
d04c6b88 | 1892 | |
4d89d377 JM |
1893 | if (WARN_ON(start != aligned_start)) { |
1894 | len -= aligned_start - start; | |
1895 | len = round_down(len, 1 << 9); | |
1896 | start = aligned_start; | |
1897 | } | |
d04c6b88 | 1898 | |
4d89d377 | 1899 | *discarded_bytes = 0; |
86557861 JM |
1900 | |
1901 | if (!len) | |
1902 | return 0; | |
1903 | ||
1904 | end = start + len; | |
1905 | bytes_left = len; | |
1906 | ||
1907 | /* Skip any superblocks on this device. */ | |
1908 | for (j = 0; j < BTRFS_SUPER_MIRROR_MAX; j++) { | |
1909 | u64 sb_start = btrfs_sb_offset(j); | |
1910 | u64 sb_end = sb_start + BTRFS_SUPER_INFO_SIZE; | |
1911 | u64 size = sb_start - start; | |
1912 | ||
1913 | if (!in_range(sb_start, start, bytes_left) && | |
1914 | !in_range(sb_end, start, bytes_left) && | |
1915 | !in_range(start, sb_start, BTRFS_SUPER_INFO_SIZE)) | |
1916 | continue; | |
1917 | ||
1918 | /* | |
1919 | * Superblock spans beginning of range. Adjust start and | |
1920 | * try again. | |
1921 | */ | |
1922 | if (sb_start <= start) { | |
1923 | start += sb_end - start; | |
1924 | if (start > end) { | |
1925 | bytes_left = 0; | |
1926 | break; | |
1927 | } | |
1928 | bytes_left = end - start; | |
1929 | continue; | |
1930 | } | |
1931 | ||
1932 | if (size) { | |
1933 | ret = blkdev_issue_discard(bdev, start >> 9, size >> 9, | |
1934 | GFP_NOFS, 0); | |
1935 | if (!ret) | |
1936 | *discarded_bytes += size; | |
1937 | else if (ret != -EOPNOTSUPP) | |
1938 | return ret; | |
1939 | } | |
1940 | ||
1941 | start = sb_end; | |
1942 | if (start > end) { | |
1943 | bytes_left = 0; | |
1944 | break; | |
1945 | } | |
1946 | bytes_left = end - start; | |
1947 | } | |
1948 | ||
1949 | if (bytes_left) { | |
1950 | ret = blkdev_issue_discard(bdev, start >> 9, bytes_left >> 9, | |
4d89d377 JM |
1951 | GFP_NOFS, 0); |
1952 | if (!ret) | |
86557861 | 1953 | *discarded_bytes += bytes_left; |
4d89d377 | 1954 | } |
d04c6b88 | 1955 | return ret; |
5d4f98a2 | 1956 | } |
5d4f98a2 | 1957 | |
1edb647b FM |
1958 | int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
1959 | u64 num_bytes, u64 *actual_bytes) | |
5d4f98a2 | 1960 | { |
5d4f98a2 | 1961 | int ret; |
5378e607 | 1962 | u64 discarded_bytes = 0; |
a1d3c478 | 1963 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1964 | |
e244a0ae | 1965 | |
5d4f98a2 | 1966 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1967 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1968 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1969 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1970 | if (!ret) { |
a1d3c478 | 1971 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1972 | int i; |
1973 | ||
5d4f98a2 | 1974 | |
a1d3c478 | 1975 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d04c6b88 | 1976 | u64 bytes; |
d5e2003c JB |
1977 | if (!stripe->dev->can_discard) |
1978 | continue; | |
1979 | ||
5378e607 LD |
1980 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1981 | stripe->physical, | |
d04c6b88 JM |
1982 | stripe->length, |
1983 | &bytes); | |
5378e607 | 1984 | if (!ret) |
d04c6b88 | 1985 | discarded_bytes += bytes; |
5378e607 | 1986 | else if (ret != -EOPNOTSUPP) |
79787eaa | 1987 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1988 | |
1989 | /* | |
1990 | * Just in case we get back EOPNOTSUPP for some reason, | |
1991 | * just ignore the return value so we don't screw up | |
1992 | * people calling discard_extent. | |
1993 | */ | |
1994 | ret = 0; | |
5d4f98a2 | 1995 | } |
6e9606d2 | 1996 | btrfs_put_bbio(bbio); |
5d4f98a2 | 1997 | } |
5378e607 LD |
1998 | |
1999 | if (actual_bytes) | |
2000 | *actual_bytes = discarded_bytes; | |
2001 | ||
5d4f98a2 | 2002 | |
53b381b3 DW |
2003 | if (ret == -EOPNOTSUPP) |
2004 | ret = 0; | |
5d4f98a2 | 2005 | return ret; |
5d4f98a2 YZ |
2006 | } |
2007 | ||
79787eaa | 2008 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
2009 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
2010 | struct btrfs_root *root, | |
2011 | u64 bytenr, u64 num_bytes, u64 parent, | |
fcebe456 JB |
2012 | u64 root_objectid, u64 owner, u64 offset, |
2013 | int no_quota) | |
5d4f98a2 YZ |
2014 | { |
2015 | int ret; | |
66d7e7f0 AJ |
2016 | struct btrfs_fs_info *fs_info = root->fs_info; |
2017 | ||
5d4f98a2 YZ |
2018 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
2019 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
2020 | ||
2021 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
2022 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
2023 | num_bytes, | |
5d4f98a2 | 2024 | parent, root_objectid, (int)owner, |
fcebe456 | 2025 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
5d4f98a2 | 2026 | } else { |
66d7e7f0 AJ |
2027 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
2028 | num_bytes, | |
5d4f98a2 | 2029 | parent, root_objectid, owner, offset, |
fcebe456 | 2030 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); |
5d4f98a2 YZ |
2031 | } |
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
2036 | struct btrfs_root *root, | |
c682f9b3 | 2037 | struct btrfs_delayed_ref_node *node, |
5d4f98a2 YZ |
2038 | u64 parent, u64 root_objectid, |
2039 | u64 owner, u64 offset, int refs_to_add, | |
2040 | struct btrfs_delayed_extent_op *extent_op) | |
2041 | { | |
fcebe456 | 2042 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
2043 | struct btrfs_path *path; |
2044 | struct extent_buffer *leaf; | |
2045 | struct btrfs_extent_item *item; | |
fcebe456 | 2046 | struct btrfs_key key; |
c682f9b3 QW |
2047 | u64 bytenr = node->bytenr; |
2048 | u64 num_bytes = node->num_bytes; | |
5d4f98a2 YZ |
2049 | u64 refs; |
2050 | int ret; | |
c682f9b3 | 2051 | int no_quota = node->no_quota; |
5d4f98a2 YZ |
2052 | |
2053 | path = btrfs_alloc_path(); | |
2054 | if (!path) | |
2055 | return -ENOMEM; | |
2056 | ||
fcebe456 JB |
2057 | if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled) |
2058 | no_quota = 1; | |
2059 | ||
5d4f98a2 YZ |
2060 | path->reada = 1; |
2061 | path->leave_spinning = 1; | |
2062 | /* this will setup the path even if it fails to insert the back ref */ | |
fcebe456 JB |
2063 | ret = insert_inline_extent_backref(trans, fs_info->extent_root, path, |
2064 | bytenr, num_bytes, parent, | |
5d4f98a2 YZ |
2065 | root_objectid, owner, offset, |
2066 | refs_to_add, extent_op); | |
0ed4792a | 2067 | if ((ret < 0 && ret != -EAGAIN) || !ret) |
5d4f98a2 | 2068 | goto out; |
fcebe456 JB |
2069 | |
2070 | /* | |
2071 | * Ok we had -EAGAIN which means we didn't have space to insert and | |
2072 | * inline extent ref, so just update the reference count and add a | |
2073 | * normal backref. | |
2074 | */ | |
5d4f98a2 | 2075 | leaf = path->nodes[0]; |
fcebe456 | 2076 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
5d4f98a2 YZ |
2077 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
2078 | refs = btrfs_extent_refs(leaf, item); | |
2079 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2080 | if (extent_op) | |
2081 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2082 | |
5d4f98a2 | 2083 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2084 | btrfs_release_path(path); |
56bec294 CM |
2085 | |
2086 | path->reada = 1; | |
b9473439 | 2087 | path->leave_spinning = 1; |
56bec294 CM |
2088 | /* now insert the actual backref */ |
2089 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
2090 | path, bytenr, parent, root_objectid, |
2091 | owner, offset, refs_to_add); | |
79787eaa JM |
2092 | if (ret) |
2093 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 2094 | out: |
56bec294 | 2095 | btrfs_free_path(path); |
30d133fc | 2096 | return ret; |
56bec294 CM |
2097 | } |
2098 | ||
5d4f98a2 YZ |
2099 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2100 | struct btrfs_root *root, | |
2101 | struct btrfs_delayed_ref_node *node, | |
2102 | struct btrfs_delayed_extent_op *extent_op, | |
2103 | int insert_reserved) | |
56bec294 | 2104 | { |
5d4f98a2 YZ |
2105 | int ret = 0; |
2106 | struct btrfs_delayed_data_ref *ref; | |
2107 | struct btrfs_key ins; | |
2108 | u64 parent = 0; | |
2109 | u64 ref_root = 0; | |
2110 | u64 flags = 0; | |
2111 | ||
2112 | ins.objectid = node->bytenr; | |
2113 | ins.offset = node->num_bytes; | |
2114 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2115 | ||
2116 | ref = btrfs_delayed_node_to_data_ref(node); | |
599c75ec LB |
2117 | trace_run_delayed_data_ref(node, ref, node->action); |
2118 | ||
5d4f98a2 YZ |
2119 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2120 | parent = ref->parent; | |
fcebe456 | 2121 | ref_root = ref->root; |
5d4f98a2 YZ |
2122 | |
2123 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2124 | if (extent_op) |
5d4f98a2 | 2125 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2126 | ret = alloc_reserved_file_extent(trans, root, |
2127 | parent, ref_root, flags, | |
2128 | ref->objectid, ref->offset, | |
2129 | &ins, node->ref_mod); | |
5d4f98a2 | 2130 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
c682f9b3 | 2131 | ret = __btrfs_inc_extent_ref(trans, root, node, parent, |
5d4f98a2 YZ |
2132 | ref_root, ref->objectid, |
2133 | ref->offset, node->ref_mod, | |
c682f9b3 | 2134 | extent_op); |
5d4f98a2 | 2135 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
c682f9b3 | 2136 | ret = __btrfs_free_extent(trans, root, node, parent, |
5d4f98a2 YZ |
2137 | ref_root, ref->objectid, |
2138 | ref->offset, node->ref_mod, | |
c682f9b3 | 2139 | extent_op); |
5d4f98a2 YZ |
2140 | } else { |
2141 | BUG(); | |
2142 | } | |
2143 | return ret; | |
2144 | } | |
2145 | ||
2146 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2147 | struct extent_buffer *leaf, | |
2148 | struct btrfs_extent_item *ei) | |
2149 | { | |
2150 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2151 | if (extent_op->update_flags) { | |
2152 | flags |= extent_op->flags_to_set; | |
2153 | btrfs_set_extent_flags(leaf, ei, flags); | |
2154 | } | |
2155 | ||
2156 | if (extent_op->update_key) { | |
2157 | struct btrfs_tree_block_info *bi; | |
2158 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2159 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2160 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2161 | } | |
2162 | } | |
2163 | ||
2164 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2165 | struct btrfs_root *root, | |
2166 | struct btrfs_delayed_ref_node *node, | |
2167 | struct btrfs_delayed_extent_op *extent_op) | |
2168 | { | |
2169 | struct btrfs_key key; | |
2170 | struct btrfs_path *path; | |
2171 | struct btrfs_extent_item *ei; | |
2172 | struct extent_buffer *leaf; | |
2173 | u32 item_size; | |
56bec294 | 2174 | int ret; |
5d4f98a2 | 2175 | int err = 0; |
b1c79e09 | 2176 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2177 | |
79787eaa JM |
2178 | if (trans->aborted) |
2179 | return 0; | |
2180 | ||
3173a18f JB |
2181 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2182 | metadata = 0; | |
2183 | ||
5d4f98a2 YZ |
2184 | path = btrfs_alloc_path(); |
2185 | if (!path) | |
2186 | return -ENOMEM; | |
2187 | ||
2188 | key.objectid = node->bytenr; | |
5d4f98a2 | 2189 | |
3173a18f | 2190 | if (metadata) { |
3173a18f | 2191 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2192 | key.offset = extent_op->level; |
3173a18f JB |
2193 | } else { |
2194 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2195 | key.offset = node->num_bytes; | |
2196 | } | |
2197 | ||
2198 | again: | |
5d4f98a2 YZ |
2199 | path->reada = 1; |
2200 | path->leave_spinning = 1; | |
2201 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2202 | path, 0, 1); | |
2203 | if (ret < 0) { | |
2204 | err = ret; | |
2205 | goto out; | |
2206 | } | |
2207 | if (ret > 0) { | |
3173a18f | 2208 | if (metadata) { |
55994887 FDBM |
2209 | if (path->slots[0] > 0) { |
2210 | path->slots[0]--; | |
2211 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2212 | path->slots[0]); | |
2213 | if (key.objectid == node->bytenr && | |
2214 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
2215 | key.offset == node->num_bytes) | |
2216 | ret = 0; | |
2217 | } | |
2218 | if (ret > 0) { | |
2219 | btrfs_release_path(path); | |
2220 | metadata = 0; | |
3173a18f | 2221 | |
55994887 FDBM |
2222 | key.objectid = node->bytenr; |
2223 | key.offset = node->num_bytes; | |
2224 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2225 | goto again; | |
2226 | } | |
2227 | } else { | |
2228 | err = -EIO; | |
2229 | goto out; | |
3173a18f | 2230 | } |
5d4f98a2 YZ |
2231 | } |
2232 | ||
2233 | leaf = path->nodes[0]; | |
2234 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2235 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2236 | if (item_size < sizeof(*ei)) { | |
2237 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2238 | path, (u64)-1, 0); | |
2239 | if (ret < 0) { | |
2240 | err = ret; | |
2241 | goto out; | |
2242 | } | |
2243 | leaf = path->nodes[0]; | |
2244 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2245 | } | |
2246 | #endif | |
2247 | BUG_ON(item_size < sizeof(*ei)); | |
2248 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2249 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2250 | |
5d4f98a2 YZ |
2251 | btrfs_mark_buffer_dirty(leaf); |
2252 | out: | |
2253 | btrfs_free_path(path); | |
2254 | return err; | |
56bec294 CM |
2255 | } |
2256 | ||
5d4f98a2 YZ |
2257 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2258 | struct btrfs_root *root, | |
2259 | struct btrfs_delayed_ref_node *node, | |
2260 | struct btrfs_delayed_extent_op *extent_op, | |
2261 | int insert_reserved) | |
56bec294 CM |
2262 | { |
2263 | int ret = 0; | |
5d4f98a2 YZ |
2264 | struct btrfs_delayed_tree_ref *ref; |
2265 | struct btrfs_key ins; | |
2266 | u64 parent = 0; | |
2267 | u64 ref_root = 0; | |
3173a18f JB |
2268 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2269 | SKINNY_METADATA); | |
56bec294 | 2270 | |
5d4f98a2 | 2271 | ref = btrfs_delayed_node_to_tree_ref(node); |
599c75ec LB |
2272 | trace_run_delayed_tree_ref(node, ref, node->action); |
2273 | ||
5d4f98a2 YZ |
2274 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2275 | parent = ref->parent; | |
fcebe456 | 2276 | ref_root = ref->root; |
5d4f98a2 | 2277 | |
3173a18f JB |
2278 | ins.objectid = node->bytenr; |
2279 | if (skinny_metadata) { | |
2280 | ins.offset = ref->level; | |
2281 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2282 | } else { | |
2283 | ins.offset = node->num_bytes; | |
2284 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2285 | } | |
2286 | ||
5d4f98a2 YZ |
2287 | BUG_ON(node->ref_mod != 1); |
2288 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2289 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2290 | ret = alloc_reserved_tree_block(trans, root, |
2291 | parent, ref_root, | |
2292 | extent_op->flags_to_set, | |
2293 | &extent_op->key, | |
fcebe456 JB |
2294 | ref->level, &ins, |
2295 | node->no_quota); | |
5d4f98a2 | 2296 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
c682f9b3 QW |
2297 | ret = __btrfs_inc_extent_ref(trans, root, node, |
2298 | parent, ref_root, | |
2299 | ref->level, 0, 1, | |
fcebe456 | 2300 | extent_op); |
5d4f98a2 | 2301 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
c682f9b3 QW |
2302 | ret = __btrfs_free_extent(trans, root, node, |
2303 | parent, ref_root, | |
2304 | ref->level, 0, 1, extent_op); | |
5d4f98a2 YZ |
2305 | } else { |
2306 | BUG(); | |
2307 | } | |
56bec294 CM |
2308 | return ret; |
2309 | } | |
2310 | ||
2311 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2312 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2313 | struct btrfs_root *root, | |
2314 | struct btrfs_delayed_ref_node *node, | |
2315 | struct btrfs_delayed_extent_op *extent_op, | |
2316 | int insert_reserved) | |
56bec294 | 2317 | { |
79787eaa JM |
2318 | int ret = 0; |
2319 | ||
857cc2fc JB |
2320 | if (trans->aborted) { |
2321 | if (insert_reserved) | |
2322 | btrfs_pin_extent(root, node->bytenr, | |
2323 | node->num_bytes, 1); | |
79787eaa | 2324 | return 0; |
857cc2fc | 2325 | } |
79787eaa | 2326 | |
5d4f98a2 | 2327 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2328 | struct btrfs_delayed_ref_head *head; |
2329 | /* | |
2330 | * we've hit the end of the chain and we were supposed | |
2331 | * to insert this extent into the tree. But, it got | |
2332 | * deleted before we ever needed to insert it, so all | |
2333 | * we have to do is clean up the accounting | |
2334 | */ | |
5d4f98a2 YZ |
2335 | BUG_ON(extent_op); |
2336 | head = btrfs_delayed_node_to_head(node); | |
599c75ec LB |
2337 | trace_run_delayed_ref_head(node, head, node->action); |
2338 | ||
56bec294 | 2339 | if (insert_reserved) { |
f0486c68 YZ |
2340 | btrfs_pin_extent(root, node->bytenr, |
2341 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2342 | if (head->is_data) { |
2343 | ret = btrfs_del_csums(trans, root, | |
2344 | node->bytenr, | |
2345 | node->num_bytes); | |
5d4f98a2 | 2346 | } |
56bec294 | 2347 | } |
79787eaa | 2348 | return ret; |
56bec294 CM |
2349 | } |
2350 | ||
5d4f98a2 YZ |
2351 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2352 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2353 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2354 | insert_reserved); | |
2355 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2356 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2357 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2358 | insert_reserved); | |
2359 | else | |
2360 | BUG(); | |
2361 | return ret; | |
56bec294 CM |
2362 | } |
2363 | ||
c6fc2454 | 2364 | static inline struct btrfs_delayed_ref_node * |
56bec294 CM |
2365 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
2366 | { | |
cffc3374 FM |
2367 | struct btrfs_delayed_ref_node *ref; |
2368 | ||
c6fc2454 QW |
2369 | if (list_empty(&head->ref_list)) |
2370 | return NULL; | |
d7df2c79 | 2371 | |
cffc3374 FM |
2372 | /* |
2373 | * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2374 | * This is to prevent a ref count from going down to zero, which deletes | |
2375 | * the extent item from the extent tree, when there still are references | |
2376 | * to add, which would fail because they would not find the extent item. | |
2377 | */ | |
2378 | list_for_each_entry(ref, &head->ref_list, list) { | |
2379 | if (ref->action == BTRFS_ADD_DELAYED_REF) | |
2380 | return ref; | |
2381 | } | |
2382 | ||
c6fc2454 QW |
2383 | return list_entry(head->ref_list.next, struct btrfs_delayed_ref_node, |
2384 | list); | |
56bec294 CM |
2385 | } |
2386 | ||
79787eaa JM |
2387 | /* |
2388 | * Returns 0 on success or if called with an already aborted transaction. | |
2389 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2390 | */ | |
d7df2c79 JB |
2391 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
2392 | struct btrfs_root *root, | |
2393 | unsigned long nr) | |
56bec294 | 2394 | { |
56bec294 CM |
2395 | struct btrfs_delayed_ref_root *delayed_refs; |
2396 | struct btrfs_delayed_ref_node *ref; | |
2397 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2398 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2399 | struct btrfs_fs_info *fs_info = root->fs_info; |
0a2b2a84 | 2400 | ktime_t start = ktime_get(); |
56bec294 | 2401 | int ret; |
d7df2c79 | 2402 | unsigned long count = 0; |
0a2b2a84 | 2403 | unsigned long actual_count = 0; |
56bec294 | 2404 | int must_insert_reserved = 0; |
56bec294 CM |
2405 | |
2406 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2407 | while (1) { |
2408 | if (!locked_ref) { | |
d7df2c79 | 2409 | if (count >= nr) |
56bec294 | 2410 | break; |
56bec294 | 2411 | |
d7df2c79 JB |
2412 | spin_lock(&delayed_refs->lock); |
2413 | locked_ref = btrfs_select_ref_head(trans); | |
2414 | if (!locked_ref) { | |
2415 | spin_unlock(&delayed_refs->lock); | |
2416 | break; | |
2417 | } | |
c3e69d58 CM |
2418 | |
2419 | /* grab the lock that says we are going to process | |
2420 | * all the refs for this head */ | |
2421 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
d7df2c79 | 2422 | spin_unlock(&delayed_refs->lock); |
c3e69d58 CM |
2423 | /* |
2424 | * we may have dropped the spin lock to get the head | |
2425 | * mutex lock, and that might have given someone else | |
2426 | * time to free the head. If that's true, it has been | |
2427 | * removed from our list and we can move on. | |
2428 | */ | |
2429 | if (ret == -EAGAIN) { | |
2430 | locked_ref = NULL; | |
2431 | count++; | |
2432 | continue; | |
56bec294 CM |
2433 | } |
2434 | } | |
a28ec197 | 2435 | |
d7df2c79 | 2436 | spin_lock(&locked_ref->lock); |
ae1e206b | 2437 | |
d1270cd9 AJ |
2438 | /* |
2439 | * locked_ref is the head node, so we have to go one | |
2440 | * node back for any delayed ref updates | |
2441 | */ | |
2442 | ref = select_delayed_ref(locked_ref); | |
2443 | ||
2444 | if (ref && ref->seq && | |
097b8a7c | 2445 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d7df2c79 | 2446 | spin_unlock(&locked_ref->lock); |
093486c4 | 2447 | btrfs_delayed_ref_unlock(locked_ref); |
d7df2c79 JB |
2448 | spin_lock(&delayed_refs->lock); |
2449 | locked_ref->processing = 0; | |
d1270cd9 AJ |
2450 | delayed_refs->num_heads_ready++; |
2451 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2452 | locked_ref = NULL; |
d1270cd9 | 2453 | cond_resched(); |
27a377db | 2454 | count++; |
d1270cd9 AJ |
2455 | continue; |
2456 | } | |
2457 | ||
56bec294 CM |
2458 | /* |
2459 | * record the must insert reserved flag before we | |
2460 | * drop the spin lock. | |
2461 | */ | |
2462 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2463 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2464 | |
5d4f98a2 YZ |
2465 | extent_op = locked_ref->extent_op; |
2466 | locked_ref->extent_op = NULL; | |
2467 | ||
56bec294 | 2468 | if (!ref) { |
d7df2c79 JB |
2469 | |
2470 | ||
56bec294 CM |
2471 | /* All delayed refs have been processed, Go ahead |
2472 | * and send the head node to run_one_delayed_ref, | |
2473 | * so that any accounting fixes can happen | |
2474 | */ | |
2475 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2476 | |
2477 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2478 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2479 | extent_op = NULL; |
2480 | } | |
2481 | ||
2482 | if (extent_op) { | |
d7df2c79 | 2483 | spin_unlock(&locked_ref->lock); |
5d4f98a2 YZ |
2484 | ret = run_delayed_extent_op(trans, root, |
2485 | ref, extent_op); | |
78a6184a | 2486 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2487 | |
79787eaa | 2488 | if (ret) { |
857cc2fc JB |
2489 | /* |
2490 | * Need to reset must_insert_reserved if | |
2491 | * there was an error so the abort stuff | |
2492 | * can cleanup the reserved space | |
2493 | * properly. | |
2494 | */ | |
2495 | if (must_insert_reserved) | |
2496 | locked_ref->must_insert_reserved = 1; | |
d7df2c79 | 2497 | locked_ref->processing = 0; |
c2cf52eb | 2498 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
093486c4 | 2499 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2500 | return ret; |
2501 | } | |
d7df2c79 | 2502 | continue; |
5d4f98a2 | 2503 | } |
02217ed2 | 2504 | |
d7df2c79 JB |
2505 | /* |
2506 | * Need to drop our head ref lock and re-aqcuire the | |
2507 | * delayed ref lock and then re-check to make sure | |
2508 | * nobody got added. | |
2509 | */ | |
2510 | spin_unlock(&locked_ref->lock); | |
2511 | spin_lock(&delayed_refs->lock); | |
2512 | spin_lock(&locked_ref->lock); | |
c6fc2454 | 2513 | if (!list_empty(&locked_ref->ref_list) || |
573a0755 | 2514 | locked_ref->extent_op) { |
d7df2c79 JB |
2515 | spin_unlock(&locked_ref->lock); |
2516 | spin_unlock(&delayed_refs->lock); | |
2517 | continue; | |
2518 | } | |
2519 | ref->in_tree = 0; | |
2520 | delayed_refs->num_heads--; | |
c46effa6 LB |
2521 | rb_erase(&locked_ref->href_node, |
2522 | &delayed_refs->href_root); | |
d7df2c79 JB |
2523 | spin_unlock(&delayed_refs->lock); |
2524 | } else { | |
0a2b2a84 | 2525 | actual_count++; |
d7df2c79 | 2526 | ref->in_tree = 0; |
c6fc2454 | 2527 | list_del(&ref->list); |
c46effa6 | 2528 | } |
d7df2c79 JB |
2529 | atomic_dec(&delayed_refs->num_entries); |
2530 | ||
093486c4 | 2531 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2532 | /* |
2533 | * when we play the delayed ref, also correct the | |
2534 | * ref_mod on head | |
2535 | */ | |
2536 | switch (ref->action) { | |
2537 | case BTRFS_ADD_DELAYED_REF: | |
2538 | case BTRFS_ADD_DELAYED_EXTENT: | |
2539 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2540 | break; | |
2541 | case BTRFS_DROP_DELAYED_REF: | |
2542 | locked_ref->node.ref_mod += ref->ref_mod; | |
2543 | break; | |
2544 | default: | |
2545 | WARN_ON(1); | |
2546 | } | |
2547 | } | |
d7df2c79 | 2548 | spin_unlock(&locked_ref->lock); |
925baedd | 2549 | |
5d4f98a2 | 2550 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2551 | must_insert_reserved); |
eb099670 | 2552 | |
78a6184a | 2553 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2554 | if (ret) { |
d7df2c79 | 2555 | locked_ref->processing = 0; |
093486c4 MX |
2556 | btrfs_delayed_ref_unlock(locked_ref); |
2557 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2558 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
79787eaa JM |
2559 | return ret; |
2560 | } | |
2561 | ||
093486c4 MX |
2562 | /* |
2563 | * If this node is a head, that means all the refs in this head | |
2564 | * have been dealt with, and we will pick the next head to deal | |
2565 | * with, so we must unlock the head and drop it from the cluster | |
2566 | * list before we release it. | |
2567 | */ | |
2568 | if (btrfs_delayed_ref_is_head(ref)) { | |
1262133b JB |
2569 | if (locked_ref->is_data && |
2570 | locked_ref->total_ref_mod < 0) { | |
2571 | spin_lock(&delayed_refs->lock); | |
2572 | delayed_refs->pending_csums -= ref->num_bytes; | |
2573 | spin_unlock(&delayed_refs->lock); | |
2574 | } | |
093486c4 MX |
2575 | btrfs_delayed_ref_unlock(locked_ref); |
2576 | locked_ref = NULL; | |
2577 | } | |
2578 | btrfs_put_delayed_ref(ref); | |
2579 | count++; | |
c3e69d58 | 2580 | cond_resched(); |
c3e69d58 | 2581 | } |
0a2b2a84 JB |
2582 | |
2583 | /* | |
2584 | * We don't want to include ref heads since we can have empty ref heads | |
2585 | * and those will drastically skew our runtime down since we just do | |
2586 | * accounting, no actual extent tree updates. | |
2587 | */ | |
2588 | if (actual_count > 0) { | |
2589 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2590 | u64 avg; | |
2591 | ||
2592 | /* | |
2593 | * We weigh the current average higher than our current runtime | |
2594 | * to avoid large swings in the average. | |
2595 | */ | |
2596 | spin_lock(&delayed_refs->lock); | |
2597 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
f8c269d7 | 2598 | fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */ |
0a2b2a84 JB |
2599 | spin_unlock(&delayed_refs->lock); |
2600 | } | |
d7df2c79 | 2601 | return 0; |
c3e69d58 CM |
2602 | } |
2603 | ||
709c0486 AJ |
2604 | #ifdef SCRAMBLE_DELAYED_REFS |
2605 | /* | |
2606 | * Normally delayed refs get processed in ascending bytenr order. This | |
2607 | * correlates in most cases to the order added. To expose dependencies on this | |
2608 | * order, we start to process the tree in the middle instead of the beginning | |
2609 | */ | |
2610 | static u64 find_middle(struct rb_root *root) | |
2611 | { | |
2612 | struct rb_node *n = root->rb_node; | |
2613 | struct btrfs_delayed_ref_node *entry; | |
2614 | int alt = 1; | |
2615 | u64 middle; | |
2616 | u64 first = 0, last = 0; | |
2617 | ||
2618 | n = rb_first(root); | |
2619 | if (n) { | |
2620 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2621 | first = entry->bytenr; | |
2622 | } | |
2623 | n = rb_last(root); | |
2624 | if (n) { | |
2625 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2626 | last = entry->bytenr; | |
2627 | } | |
2628 | n = root->rb_node; | |
2629 | ||
2630 | while (n) { | |
2631 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2632 | WARN_ON(!entry->in_tree); | |
2633 | ||
2634 | middle = entry->bytenr; | |
2635 | ||
2636 | if (alt) | |
2637 | n = n->rb_left; | |
2638 | else | |
2639 | n = n->rb_right; | |
2640 | ||
2641 | alt = 1 - alt; | |
2642 | } | |
2643 | return middle; | |
2644 | } | |
2645 | #endif | |
2646 | ||
1be41b78 JB |
2647 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
2648 | { | |
2649 | u64 num_bytes; | |
2650 | ||
2651 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2652 | sizeof(struct btrfs_extent_inline_ref)); | |
2653 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2654 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2655 | ||
2656 | /* | |
2657 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2658 | * closer to what we're really going to want to ouse. | |
2659 | */ | |
f8c269d7 | 2660 | return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); |
1be41b78 JB |
2661 | } |
2662 | ||
1262133b JB |
2663 | /* |
2664 | * Takes the number of bytes to be csumm'ed and figures out how many leaves it | |
2665 | * would require to store the csums for that many bytes. | |
2666 | */ | |
28f75a0e | 2667 | u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes) |
1262133b JB |
2668 | { |
2669 | u64 csum_size; | |
2670 | u64 num_csums_per_leaf; | |
2671 | u64 num_csums; | |
2672 | ||
2673 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
2674 | num_csums_per_leaf = div64_u64(csum_size, | |
2675 | (u64)btrfs_super_csum_size(root->fs_info->super_copy)); | |
2676 | num_csums = div64_u64(csum_bytes, root->sectorsize); | |
2677 | num_csums += num_csums_per_leaf - 1; | |
2678 | num_csums = div64_u64(num_csums, num_csums_per_leaf); | |
2679 | return num_csums; | |
2680 | } | |
2681 | ||
0a2b2a84 | 2682 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
1be41b78 JB |
2683 | struct btrfs_root *root) |
2684 | { | |
2685 | struct btrfs_block_rsv *global_rsv; | |
2686 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
1262133b | 2687 | u64 csum_bytes = trans->transaction->delayed_refs.pending_csums; |
cb723e49 JB |
2688 | u64 num_dirty_bgs = trans->transaction->num_dirty_bgs; |
2689 | u64 num_bytes, num_dirty_bgs_bytes; | |
1be41b78 JB |
2690 | int ret = 0; |
2691 | ||
2692 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2693 | num_heads = heads_to_leaves(root, num_heads); | |
2694 | if (num_heads > 1) | |
707e8a07 | 2695 | num_bytes += (num_heads - 1) * root->nodesize; |
1be41b78 | 2696 | num_bytes <<= 1; |
28f75a0e | 2697 | num_bytes += btrfs_csum_bytes_to_leaves(root, csum_bytes) * root->nodesize; |
cb723e49 JB |
2698 | num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(root, |
2699 | num_dirty_bgs); | |
1be41b78 JB |
2700 | global_rsv = &root->fs_info->global_block_rsv; |
2701 | ||
2702 | /* | |
2703 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2704 | * wiggle room since running delayed refs can create more delayed refs. | |
2705 | */ | |
cb723e49 JB |
2706 | if (global_rsv->space_info->full) { |
2707 | num_dirty_bgs_bytes <<= 1; | |
1be41b78 | 2708 | num_bytes <<= 1; |
cb723e49 | 2709 | } |
1be41b78 JB |
2710 | |
2711 | spin_lock(&global_rsv->lock); | |
cb723e49 | 2712 | if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes) |
1be41b78 JB |
2713 | ret = 1; |
2714 | spin_unlock(&global_rsv->lock); | |
2715 | return ret; | |
2716 | } | |
2717 | ||
0a2b2a84 JB |
2718 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
2719 | struct btrfs_root *root) | |
2720 | { | |
2721 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2722 | u64 num_entries = | |
2723 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2724 | u64 avg_runtime; | |
a79b7d4b | 2725 | u64 val; |
0a2b2a84 JB |
2726 | |
2727 | smp_mb(); | |
2728 | avg_runtime = fs_info->avg_delayed_ref_runtime; | |
a79b7d4b | 2729 | val = num_entries * avg_runtime; |
0a2b2a84 JB |
2730 | if (num_entries * avg_runtime >= NSEC_PER_SEC) |
2731 | return 1; | |
a79b7d4b CM |
2732 | if (val >= NSEC_PER_SEC / 2) |
2733 | return 2; | |
0a2b2a84 JB |
2734 | |
2735 | return btrfs_check_space_for_delayed_refs(trans, root); | |
2736 | } | |
2737 | ||
a79b7d4b CM |
2738 | struct async_delayed_refs { |
2739 | struct btrfs_root *root; | |
2740 | int count; | |
2741 | int error; | |
2742 | int sync; | |
2743 | struct completion wait; | |
2744 | struct btrfs_work work; | |
2745 | }; | |
2746 | ||
2747 | static void delayed_ref_async_start(struct btrfs_work *work) | |
2748 | { | |
2749 | struct async_delayed_refs *async; | |
2750 | struct btrfs_trans_handle *trans; | |
2751 | int ret; | |
2752 | ||
2753 | async = container_of(work, struct async_delayed_refs, work); | |
2754 | ||
2755 | trans = btrfs_join_transaction(async->root); | |
2756 | if (IS_ERR(trans)) { | |
2757 | async->error = PTR_ERR(trans); | |
2758 | goto done; | |
2759 | } | |
2760 | ||
2761 | /* | |
2762 | * trans->sync means that when we call end_transaciton, we won't | |
2763 | * wait on delayed refs | |
2764 | */ | |
2765 | trans->sync = true; | |
2766 | ret = btrfs_run_delayed_refs(trans, async->root, async->count); | |
2767 | if (ret) | |
2768 | async->error = ret; | |
2769 | ||
2770 | ret = btrfs_end_transaction(trans, async->root); | |
2771 | if (ret && !async->error) | |
2772 | async->error = ret; | |
2773 | done: | |
2774 | if (async->sync) | |
2775 | complete(&async->wait); | |
2776 | else | |
2777 | kfree(async); | |
2778 | } | |
2779 | ||
2780 | int btrfs_async_run_delayed_refs(struct btrfs_root *root, | |
2781 | unsigned long count, int wait) | |
2782 | { | |
2783 | struct async_delayed_refs *async; | |
2784 | int ret; | |
2785 | ||
2786 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
2787 | if (!async) | |
2788 | return -ENOMEM; | |
2789 | ||
2790 | async->root = root->fs_info->tree_root; | |
2791 | async->count = count; | |
2792 | async->error = 0; | |
2793 | if (wait) | |
2794 | async->sync = 1; | |
2795 | else | |
2796 | async->sync = 0; | |
2797 | init_completion(&async->wait); | |
2798 | ||
9e0af237 LB |
2799 | btrfs_init_work(&async->work, btrfs_extent_refs_helper, |
2800 | delayed_ref_async_start, NULL, NULL); | |
a79b7d4b CM |
2801 | |
2802 | btrfs_queue_work(root->fs_info->extent_workers, &async->work); | |
2803 | ||
2804 | if (wait) { | |
2805 | wait_for_completion(&async->wait); | |
2806 | ret = async->error; | |
2807 | kfree(async); | |
2808 | return ret; | |
2809 | } | |
2810 | return 0; | |
2811 | } | |
2812 | ||
c3e69d58 CM |
2813 | /* |
2814 | * this starts processing the delayed reference count updates and | |
2815 | * extent insertions we have queued up so far. count can be | |
2816 | * 0, which means to process everything in the tree at the start | |
2817 | * of the run (but not newly added entries), or it can be some target | |
2818 | * number you'd like to process. | |
79787eaa JM |
2819 | * |
2820 | * Returns 0 on success or if called with an aborted transaction | |
2821 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2822 | */ |
2823 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2824 | struct btrfs_root *root, unsigned long count) | |
2825 | { | |
2826 | struct rb_node *node; | |
2827 | struct btrfs_delayed_ref_root *delayed_refs; | |
c46effa6 | 2828 | struct btrfs_delayed_ref_head *head; |
c3e69d58 CM |
2829 | int ret; |
2830 | int run_all = count == (unsigned long)-1; | |
d9a0540a | 2831 | bool can_flush_pending_bgs = trans->can_flush_pending_bgs; |
c3e69d58 | 2832 | |
79787eaa JM |
2833 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2834 | if (trans->aborted) | |
2835 | return 0; | |
2836 | ||
c3e69d58 CM |
2837 | if (root == root->fs_info->extent_root) |
2838 | root = root->fs_info->tree_root; | |
2839 | ||
2840 | delayed_refs = &trans->transaction->delayed_refs; | |
26455d33 | 2841 | if (count == 0) |
d7df2c79 | 2842 | count = atomic_read(&delayed_refs->num_entries) * 2; |
bb721703 | 2843 | |
c3e69d58 | 2844 | again: |
709c0486 AJ |
2845 | #ifdef SCRAMBLE_DELAYED_REFS |
2846 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2847 | #endif | |
d9a0540a | 2848 | trans->can_flush_pending_bgs = false; |
d7df2c79 JB |
2849 | ret = __btrfs_run_delayed_refs(trans, root, count); |
2850 | if (ret < 0) { | |
2851 | btrfs_abort_transaction(trans, root, ret); | |
2852 | return ret; | |
eb099670 | 2853 | } |
c3e69d58 | 2854 | |
56bec294 | 2855 | if (run_all) { |
d7df2c79 | 2856 | if (!list_empty(&trans->new_bgs)) |
ea658bad | 2857 | btrfs_create_pending_block_groups(trans, root); |
ea658bad | 2858 | |
d7df2c79 | 2859 | spin_lock(&delayed_refs->lock); |
c46effa6 | 2860 | node = rb_first(&delayed_refs->href_root); |
d7df2c79 JB |
2861 | if (!node) { |
2862 | spin_unlock(&delayed_refs->lock); | |
56bec294 | 2863 | goto out; |
d7df2c79 | 2864 | } |
c3e69d58 | 2865 | count = (unsigned long)-1; |
e9d0b13b | 2866 | |
56bec294 | 2867 | while (node) { |
c46effa6 LB |
2868 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
2869 | href_node); | |
2870 | if (btrfs_delayed_ref_is_head(&head->node)) { | |
2871 | struct btrfs_delayed_ref_node *ref; | |
5caf2a00 | 2872 | |
c46effa6 | 2873 | ref = &head->node; |
56bec294 CM |
2874 | atomic_inc(&ref->refs); |
2875 | ||
2876 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2877 | /* |
2878 | * Mutex was contended, block until it's | |
2879 | * released and try again | |
2880 | */ | |
56bec294 CM |
2881 | mutex_lock(&head->mutex); |
2882 | mutex_unlock(&head->mutex); | |
2883 | ||
2884 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2885 | cond_resched(); |
56bec294 | 2886 | goto again; |
c46effa6 LB |
2887 | } else { |
2888 | WARN_ON(1); | |
56bec294 CM |
2889 | } |
2890 | node = rb_next(node); | |
2891 | } | |
2892 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2893 | cond_resched(); |
56bec294 | 2894 | goto again; |
5f39d397 | 2895 | } |
54aa1f4d | 2896 | out: |
edf39272 | 2897 | assert_qgroups_uptodate(trans); |
d9a0540a | 2898 | trans->can_flush_pending_bgs = can_flush_pending_bgs; |
a28ec197 CM |
2899 | return 0; |
2900 | } | |
2901 | ||
5d4f98a2 YZ |
2902 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2903 | struct btrfs_root *root, | |
2904 | u64 bytenr, u64 num_bytes, u64 flags, | |
b1c79e09 | 2905 | int level, int is_data) |
5d4f98a2 YZ |
2906 | { |
2907 | struct btrfs_delayed_extent_op *extent_op; | |
2908 | int ret; | |
2909 | ||
78a6184a | 2910 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2911 | if (!extent_op) |
2912 | return -ENOMEM; | |
2913 | ||
2914 | extent_op->flags_to_set = flags; | |
2915 | extent_op->update_flags = 1; | |
2916 | extent_op->update_key = 0; | |
2917 | extent_op->is_data = is_data ? 1 : 0; | |
b1c79e09 | 2918 | extent_op->level = level; |
5d4f98a2 | 2919 | |
66d7e7f0 AJ |
2920 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2921 | num_bytes, extent_op); | |
5d4f98a2 | 2922 | if (ret) |
78a6184a | 2923 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2924 | return ret; |
2925 | } | |
2926 | ||
2927 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2928 | struct btrfs_root *root, | |
2929 | struct btrfs_path *path, | |
2930 | u64 objectid, u64 offset, u64 bytenr) | |
2931 | { | |
2932 | struct btrfs_delayed_ref_head *head; | |
2933 | struct btrfs_delayed_ref_node *ref; | |
2934 | struct btrfs_delayed_data_ref *data_ref; | |
2935 | struct btrfs_delayed_ref_root *delayed_refs; | |
5d4f98a2 YZ |
2936 | int ret = 0; |
2937 | ||
5d4f98a2 YZ |
2938 | delayed_refs = &trans->transaction->delayed_refs; |
2939 | spin_lock(&delayed_refs->lock); | |
2940 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
d7df2c79 JB |
2941 | if (!head) { |
2942 | spin_unlock(&delayed_refs->lock); | |
2943 | return 0; | |
2944 | } | |
5d4f98a2 YZ |
2945 | |
2946 | if (!mutex_trylock(&head->mutex)) { | |
2947 | atomic_inc(&head->node.refs); | |
2948 | spin_unlock(&delayed_refs->lock); | |
2949 | ||
b3b4aa74 | 2950 | btrfs_release_path(path); |
5d4f98a2 | 2951 | |
8cc33e5c DS |
2952 | /* |
2953 | * Mutex was contended, block until it's released and let | |
2954 | * caller try again | |
2955 | */ | |
5d4f98a2 YZ |
2956 | mutex_lock(&head->mutex); |
2957 | mutex_unlock(&head->mutex); | |
2958 | btrfs_put_delayed_ref(&head->node); | |
2959 | return -EAGAIN; | |
2960 | } | |
d7df2c79 | 2961 | spin_unlock(&delayed_refs->lock); |
5d4f98a2 | 2962 | |
d7df2c79 | 2963 | spin_lock(&head->lock); |
c6fc2454 | 2964 | list_for_each_entry(ref, &head->ref_list, list) { |
d7df2c79 JB |
2965 | /* If it's a shared ref we know a cross reference exists */ |
2966 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
2967 | ret = 1; | |
2968 | break; | |
2969 | } | |
5d4f98a2 | 2970 | |
d7df2c79 | 2971 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
5d4f98a2 | 2972 | |
d7df2c79 JB |
2973 | /* |
2974 | * If our ref doesn't match the one we're currently looking at | |
2975 | * then we have a cross reference. | |
2976 | */ | |
2977 | if (data_ref->root != root->root_key.objectid || | |
2978 | data_ref->objectid != objectid || | |
2979 | data_ref->offset != offset) { | |
2980 | ret = 1; | |
2981 | break; | |
2982 | } | |
5d4f98a2 | 2983 | } |
d7df2c79 | 2984 | spin_unlock(&head->lock); |
5d4f98a2 | 2985 | mutex_unlock(&head->mutex); |
5d4f98a2 YZ |
2986 | return ret; |
2987 | } | |
2988 | ||
2989 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2990 | struct btrfs_root *root, | |
2991 | struct btrfs_path *path, | |
2992 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2993 | { |
2994 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2995 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2996 | struct btrfs_extent_data_ref *ref; |
2997 | struct btrfs_extent_inline_ref *iref; | |
2998 | struct btrfs_extent_item *ei; | |
f321e491 | 2999 | struct btrfs_key key; |
5d4f98a2 | 3000 | u32 item_size; |
be20aa9d | 3001 | int ret; |
925baedd | 3002 | |
be20aa9d | 3003 | key.objectid = bytenr; |
31840ae1 | 3004 | key.offset = (u64)-1; |
f321e491 | 3005 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 3006 | |
be20aa9d CM |
3007 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
3008 | if (ret < 0) | |
3009 | goto out; | |
79787eaa | 3010 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
3011 | |
3012 | ret = -ENOENT; | |
3013 | if (path->slots[0] == 0) | |
31840ae1 | 3014 | goto out; |
be20aa9d | 3015 | |
31840ae1 | 3016 | path->slots[0]--; |
f321e491 | 3017 | leaf = path->nodes[0]; |
5d4f98a2 | 3018 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 3019 | |
5d4f98a2 | 3020 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 3021 | goto out; |
f321e491 | 3022 | |
5d4f98a2 YZ |
3023 | ret = 1; |
3024 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
3025 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3026 | if (item_size < sizeof(*ei)) { | |
3027 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
3028 | goto out; | |
3029 | } | |
3030 | #endif | |
3031 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 3032 | |
5d4f98a2 YZ |
3033 | if (item_size != sizeof(*ei) + |
3034 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
3035 | goto out; | |
be20aa9d | 3036 | |
5d4f98a2 YZ |
3037 | if (btrfs_extent_generation(leaf, ei) <= |
3038 | btrfs_root_last_snapshot(&root->root_item)) | |
3039 | goto out; | |
3040 | ||
3041 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
3042 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
3043 | BTRFS_EXTENT_DATA_REF_KEY) | |
3044 | goto out; | |
3045 | ||
3046 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
3047 | if (btrfs_extent_refs(leaf, ei) != | |
3048 | btrfs_extent_data_ref_count(leaf, ref) || | |
3049 | btrfs_extent_data_ref_root(leaf, ref) != | |
3050 | root->root_key.objectid || | |
3051 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
3052 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
3053 | goto out; | |
3054 | ||
3055 | ret = 0; | |
3056 | out: | |
3057 | return ret; | |
3058 | } | |
3059 | ||
3060 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
3061 | struct btrfs_root *root, | |
3062 | u64 objectid, u64 offset, u64 bytenr) | |
3063 | { | |
3064 | struct btrfs_path *path; | |
3065 | int ret; | |
3066 | int ret2; | |
3067 | ||
3068 | path = btrfs_alloc_path(); | |
3069 | if (!path) | |
3070 | return -ENOENT; | |
3071 | ||
3072 | do { | |
3073 | ret = check_committed_ref(trans, root, path, objectid, | |
3074 | offset, bytenr); | |
3075 | if (ret && ret != -ENOENT) | |
f321e491 | 3076 | goto out; |
80ff3856 | 3077 | |
5d4f98a2 YZ |
3078 | ret2 = check_delayed_ref(trans, root, path, objectid, |
3079 | offset, bytenr); | |
3080 | } while (ret2 == -EAGAIN); | |
3081 | ||
3082 | if (ret2 && ret2 != -ENOENT) { | |
3083 | ret = ret2; | |
3084 | goto out; | |
f321e491 | 3085 | } |
5d4f98a2 YZ |
3086 | |
3087 | if (ret != -ENOENT || ret2 != -ENOENT) | |
3088 | ret = 0; | |
be20aa9d | 3089 | out: |
80ff3856 | 3090 | btrfs_free_path(path); |
f0486c68 YZ |
3091 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
3092 | WARN_ON(ret > 0); | |
f321e491 | 3093 | return ret; |
be20aa9d | 3094 | } |
c5739bba | 3095 | |
5d4f98a2 | 3096 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 3097 | struct btrfs_root *root, |
5d4f98a2 | 3098 | struct extent_buffer *buf, |
e339a6b0 | 3099 | int full_backref, int inc) |
31840ae1 ZY |
3100 | { |
3101 | u64 bytenr; | |
5d4f98a2 YZ |
3102 | u64 num_bytes; |
3103 | u64 parent; | |
31840ae1 | 3104 | u64 ref_root; |
31840ae1 | 3105 | u32 nritems; |
31840ae1 ZY |
3106 | struct btrfs_key key; |
3107 | struct btrfs_file_extent_item *fi; | |
3108 | int i; | |
3109 | int level; | |
3110 | int ret = 0; | |
31840ae1 | 3111 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 3112 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 | 3113 | |
fccb84c9 DS |
3114 | |
3115 | if (btrfs_test_is_dummy_root(root)) | |
faa2dbf0 | 3116 | return 0; |
fccb84c9 | 3117 | |
31840ae1 | 3118 | ref_root = btrfs_header_owner(buf); |
31840ae1 ZY |
3119 | nritems = btrfs_header_nritems(buf); |
3120 | level = btrfs_header_level(buf); | |
3121 | ||
27cdeb70 | 3122 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) |
5d4f98a2 | 3123 | return 0; |
31840ae1 | 3124 | |
5d4f98a2 YZ |
3125 | if (inc) |
3126 | process_func = btrfs_inc_extent_ref; | |
3127 | else | |
3128 | process_func = btrfs_free_extent; | |
31840ae1 | 3129 | |
5d4f98a2 YZ |
3130 | if (full_backref) |
3131 | parent = buf->start; | |
3132 | else | |
3133 | parent = 0; | |
3134 | ||
3135 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3136 | if (level == 0) { |
5d4f98a2 | 3137 | btrfs_item_key_to_cpu(buf, &key, i); |
962a298f | 3138 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
31840ae1 | 3139 | continue; |
5d4f98a2 | 3140 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3141 | struct btrfs_file_extent_item); |
3142 | if (btrfs_file_extent_type(buf, fi) == | |
3143 | BTRFS_FILE_EXTENT_INLINE) | |
3144 | continue; | |
3145 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3146 | if (bytenr == 0) | |
3147 | continue; | |
5d4f98a2 YZ |
3148 | |
3149 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3150 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3151 | ret = process_func(trans, root, bytenr, num_bytes, | |
3152 | parent, ref_root, key.objectid, | |
e339a6b0 | 3153 | key.offset, 1); |
31840ae1 ZY |
3154 | if (ret) |
3155 | goto fail; | |
3156 | } else { | |
5d4f98a2 | 3157 | bytenr = btrfs_node_blockptr(buf, i); |
707e8a07 | 3158 | num_bytes = root->nodesize; |
5d4f98a2 | 3159 | ret = process_func(trans, root, bytenr, num_bytes, |
66d7e7f0 | 3160 | parent, ref_root, level - 1, 0, |
e339a6b0 | 3161 | 1); |
31840ae1 ZY |
3162 | if (ret) |
3163 | goto fail; | |
3164 | } | |
3165 | } | |
3166 | return 0; | |
3167 | fail: | |
5d4f98a2 YZ |
3168 | return ret; |
3169 | } | |
3170 | ||
3171 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3172 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3173 | { |
e339a6b0 | 3174 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); |
5d4f98a2 YZ |
3175 | } |
3176 | ||
3177 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3178 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3179 | { |
e339a6b0 | 3180 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); |
31840ae1 ZY |
3181 | } |
3182 | ||
9078a3e1 CM |
3183 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3184 | struct btrfs_root *root, | |
3185 | struct btrfs_path *path, | |
3186 | struct btrfs_block_group_cache *cache) | |
3187 | { | |
3188 | int ret; | |
9078a3e1 | 3189 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3190 | unsigned long bi; |
3191 | struct extent_buffer *leaf; | |
9078a3e1 | 3192 | |
9078a3e1 | 3193 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
df95e7f0 JB |
3194 | if (ret) { |
3195 | if (ret > 0) | |
3196 | ret = -ENOENT; | |
54aa1f4d | 3197 | goto fail; |
df95e7f0 | 3198 | } |
5f39d397 CM |
3199 | |
3200 | leaf = path->nodes[0]; | |
3201 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3202 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3203 | btrfs_mark_buffer_dirty(leaf); | |
54aa1f4d | 3204 | fail: |
24b89d08 | 3205 | btrfs_release_path(path); |
df95e7f0 | 3206 | return ret; |
9078a3e1 CM |
3207 | |
3208 | } | |
3209 | ||
4a8c9a62 YZ |
3210 | static struct btrfs_block_group_cache * |
3211 | next_block_group(struct btrfs_root *root, | |
3212 | struct btrfs_block_group_cache *cache) | |
3213 | { | |
3214 | struct rb_node *node; | |
292cbd51 | 3215 | |
4a8c9a62 | 3216 | spin_lock(&root->fs_info->block_group_cache_lock); |
292cbd51 FM |
3217 | |
3218 | /* If our block group was removed, we need a full search. */ | |
3219 | if (RB_EMPTY_NODE(&cache->cache_node)) { | |
3220 | const u64 next_bytenr = cache->key.objectid + cache->key.offset; | |
3221 | ||
3222 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3223 | btrfs_put_block_group(cache); | |
3224 | cache = btrfs_lookup_first_block_group(root->fs_info, | |
3225 | next_bytenr); | |
3226 | return cache; | |
3227 | } | |
4a8c9a62 YZ |
3228 | node = rb_next(&cache->cache_node); |
3229 | btrfs_put_block_group(cache); | |
3230 | if (node) { | |
3231 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3232 | cache_node); | |
11dfe35a | 3233 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3234 | } else |
3235 | cache = NULL; | |
3236 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3237 | return cache; | |
3238 | } | |
3239 | ||
0af3d00b JB |
3240 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3241 | struct btrfs_trans_handle *trans, | |
3242 | struct btrfs_path *path) | |
3243 | { | |
3244 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3245 | struct inode *inode = NULL; | |
3246 | u64 alloc_hint = 0; | |
2b20982e | 3247 | int dcs = BTRFS_DC_ERROR; |
f8c269d7 | 3248 | u64 num_pages = 0; |
0af3d00b JB |
3249 | int retries = 0; |
3250 | int ret = 0; | |
3251 | ||
3252 | /* | |
3253 | * If this block group is smaller than 100 megs don't bother caching the | |
3254 | * block group. | |
3255 | */ | |
3256 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3257 | spin_lock(&block_group->lock); | |
3258 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3259 | spin_unlock(&block_group->lock); | |
3260 | return 0; | |
3261 | } | |
3262 | ||
0c0ef4bc JB |
3263 | if (trans->aborted) |
3264 | return 0; | |
0af3d00b JB |
3265 | again: |
3266 | inode = lookup_free_space_inode(root, block_group, path); | |
3267 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3268 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3269 | btrfs_release_path(path); |
0af3d00b JB |
3270 | goto out; |
3271 | } | |
3272 | ||
3273 | if (IS_ERR(inode)) { | |
3274 | BUG_ON(retries); | |
3275 | retries++; | |
3276 | ||
3277 | if (block_group->ro) | |
3278 | goto out_free; | |
3279 | ||
3280 | ret = create_free_space_inode(root, trans, block_group, path); | |
3281 | if (ret) | |
3282 | goto out_free; | |
3283 | goto again; | |
3284 | } | |
3285 | ||
5b0e95bf JB |
3286 | /* We've already setup this transaction, go ahead and exit */ |
3287 | if (block_group->cache_generation == trans->transid && | |
3288 | i_size_read(inode)) { | |
3289 | dcs = BTRFS_DC_SETUP; | |
3290 | goto out_put; | |
3291 | } | |
3292 | ||
0af3d00b JB |
3293 | /* |
3294 | * We want to set the generation to 0, that way if anything goes wrong | |
3295 | * from here on out we know not to trust this cache when we load up next | |
3296 | * time. | |
3297 | */ | |
3298 | BTRFS_I(inode)->generation = 0; | |
3299 | ret = btrfs_update_inode(trans, root, inode); | |
0c0ef4bc JB |
3300 | if (ret) { |
3301 | /* | |
3302 | * So theoretically we could recover from this, simply set the | |
3303 | * super cache generation to 0 so we know to invalidate the | |
3304 | * cache, but then we'd have to keep track of the block groups | |
3305 | * that fail this way so we know we _have_ to reset this cache | |
3306 | * before the next commit or risk reading stale cache. So to | |
3307 | * limit our exposure to horrible edge cases lets just abort the | |
3308 | * transaction, this only happens in really bad situations | |
3309 | * anyway. | |
3310 | */ | |
3311 | btrfs_abort_transaction(trans, root, ret); | |
3312 | goto out_put; | |
3313 | } | |
0af3d00b JB |
3314 | WARN_ON(ret); |
3315 | ||
3316 | if (i_size_read(inode) > 0) { | |
7b61cd92 MX |
3317 | ret = btrfs_check_trunc_cache_free_space(root, |
3318 | &root->fs_info->global_block_rsv); | |
3319 | if (ret) | |
3320 | goto out_put; | |
3321 | ||
1bbc621e | 3322 | ret = btrfs_truncate_free_space_cache(root, trans, NULL, inode); |
0af3d00b JB |
3323 | if (ret) |
3324 | goto out_put; | |
3325 | } | |
3326 | ||
3327 | spin_lock(&block_group->lock); | |
cf7c1ef6 | 3328 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
e4c88f00 | 3329 | !btrfs_test_opt(root, SPACE_CACHE)) { |
cf7c1ef6 LB |
3330 | /* |
3331 | * don't bother trying to write stuff out _if_ | |
3332 | * a) we're not cached, | |
3333 | * b) we're with nospace_cache mount option. | |
3334 | */ | |
2b20982e | 3335 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3336 | spin_unlock(&block_group->lock); |
3337 | goto out_put; | |
3338 | } | |
3339 | spin_unlock(&block_group->lock); | |
3340 | ||
6fc823b1 JB |
3341 | /* |
3342 | * Try to preallocate enough space based on how big the block group is. | |
3343 | * Keep in mind this has to include any pinned space which could end up | |
3344 | * taking up quite a bit since it's not folded into the other space | |
3345 | * cache. | |
3346 | */ | |
f8c269d7 | 3347 | num_pages = div_u64(block_group->key.offset, 256 * 1024 * 1024); |
0af3d00b JB |
3348 | if (!num_pages) |
3349 | num_pages = 1; | |
3350 | ||
0af3d00b JB |
3351 | num_pages *= 16; |
3352 | num_pages *= PAGE_CACHE_SIZE; | |
3353 | ||
e2d1f923 | 3354 | ret = btrfs_check_data_free_space(inode, num_pages, num_pages); |
0af3d00b JB |
3355 | if (ret) |
3356 | goto out_put; | |
3357 | ||
3358 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3359 | num_pages, num_pages, | |
3360 | &alloc_hint); | |
2b20982e JB |
3361 | if (!ret) |
3362 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3363 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3364 | |
0af3d00b JB |
3365 | out_put: |
3366 | iput(inode); | |
3367 | out_free: | |
b3b4aa74 | 3368 | btrfs_release_path(path); |
0af3d00b JB |
3369 | out: |
3370 | spin_lock(&block_group->lock); | |
e65cbb94 | 3371 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3372 | block_group->cache_generation = trans->transid; |
2b20982e | 3373 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3374 | spin_unlock(&block_group->lock); |
3375 | ||
3376 | return ret; | |
3377 | } | |
3378 | ||
dcdf7f6d JB |
3379 | int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, |
3380 | struct btrfs_root *root) | |
3381 | { | |
3382 | struct btrfs_block_group_cache *cache, *tmp; | |
3383 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3384 | struct btrfs_path *path; | |
3385 | ||
3386 | if (list_empty(&cur_trans->dirty_bgs) || | |
3387 | !btrfs_test_opt(root, SPACE_CACHE)) | |
3388 | return 0; | |
3389 | ||
3390 | path = btrfs_alloc_path(); | |
3391 | if (!path) | |
3392 | return -ENOMEM; | |
3393 | ||
3394 | /* Could add new block groups, use _safe just in case */ | |
3395 | list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, | |
3396 | dirty_list) { | |
3397 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3398 | cache_save_setup(cache, trans, path); | |
3399 | } | |
3400 | ||
3401 | btrfs_free_path(path); | |
3402 | return 0; | |
3403 | } | |
3404 | ||
1bbc621e CM |
3405 | /* |
3406 | * transaction commit does final block group cache writeback during a | |
3407 | * critical section where nothing is allowed to change the FS. This is | |
3408 | * required in order for the cache to actually match the block group, | |
3409 | * but can introduce a lot of latency into the commit. | |
3410 | * | |
3411 | * So, btrfs_start_dirty_block_groups is here to kick off block group | |
3412 | * cache IO. There's a chance we'll have to redo some of it if the | |
3413 | * block group changes again during the commit, but it greatly reduces | |
3414 | * the commit latency by getting rid of the easy block groups while | |
3415 | * we're still allowing others to join the commit. | |
3416 | */ | |
3417 | int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans, | |
96b5179d | 3418 | struct btrfs_root *root) |
9078a3e1 | 3419 | { |
4a8c9a62 | 3420 | struct btrfs_block_group_cache *cache; |
ce93ec54 JB |
3421 | struct btrfs_transaction *cur_trans = trans->transaction; |
3422 | int ret = 0; | |
c9dc4c65 | 3423 | int should_put; |
1bbc621e CM |
3424 | struct btrfs_path *path = NULL; |
3425 | LIST_HEAD(dirty); | |
3426 | struct list_head *io = &cur_trans->io_bgs; | |
c9dc4c65 | 3427 | int num_started = 0; |
1bbc621e CM |
3428 | int loops = 0; |
3429 | ||
3430 | spin_lock(&cur_trans->dirty_bgs_lock); | |
b58d1a9e FM |
3431 | if (list_empty(&cur_trans->dirty_bgs)) { |
3432 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3433 | return 0; | |
1bbc621e | 3434 | } |
b58d1a9e | 3435 | list_splice_init(&cur_trans->dirty_bgs, &dirty); |
1bbc621e | 3436 | spin_unlock(&cur_trans->dirty_bgs_lock); |
ce93ec54 | 3437 | |
1bbc621e | 3438 | again: |
1bbc621e CM |
3439 | /* |
3440 | * make sure all the block groups on our dirty list actually | |
3441 | * exist | |
3442 | */ | |
3443 | btrfs_create_pending_block_groups(trans, root); | |
3444 | ||
3445 | if (!path) { | |
3446 | path = btrfs_alloc_path(); | |
3447 | if (!path) | |
3448 | return -ENOMEM; | |
3449 | } | |
3450 | ||
b58d1a9e FM |
3451 | /* |
3452 | * cache_write_mutex is here only to save us from balance or automatic | |
3453 | * removal of empty block groups deleting this block group while we are | |
3454 | * writing out the cache | |
3455 | */ | |
3456 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e CM |
3457 | while (!list_empty(&dirty)) { |
3458 | cache = list_first_entry(&dirty, | |
3459 | struct btrfs_block_group_cache, | |
3460 | dirty_list); | |
1bbc621e CM |
3461 | /* |
3462 | * this can happen if something re-dirties a block | |
3463 | * group that is already under IO. Just wait for it to | |
3464 | * finish and then do it all again | |
3465 | */ | |
3466 | if (!list_empty(&cache->io_list)) { | |
3467 | list_del_init(&cache->io_list); | |
3468 | btrfs_wait_cache_io(root, trans, cache, | |
3469 | &cache->io_ctl, path, | |
3470 | cache->key.objectid); | |
3471 | btrfs_put_block_group(cache); | |
3472 | } | |
3473 | ||
3474 | ||
3475 | /* | |
3476 | * btrfs_wait_cache_io uses the cache->dirty_list to decide | |
3477 | * if it should update the cache_state. Don't delete | |
3478 | * until after we wait. | |
3479 | * | |
3480 | * Since we're not running in the commit critical section | |
3481 | * we need the dirty_bgs_lock to protect from update_block_group | |
3482 | */ | |
3483 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3484 | list_del_init(&cache->dirty_list); | |
3485 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3486 | ||
3487 | should_put = 1; | |
3488 | ||
3489 | cache_save_setup(cache, trans, path); | |
3490 | ||
3491 | if (cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3492 | cache->io_ctl.inode = NULL; | |
3493 | ret = btrfs_write_out_cache(root, trans, cache, path); | |
3494 | if (ret == 0 && cache->io_ctl.inode) { | |
3495 | num_started++; | |
3496 | should_put = 0; | |
3497 | ||
3498 | /* | |
3499 | * the cache_write_mutex is protecting | |
3500 | * the io_list | |
3501 | */ | |
3502 | list_add_tail(&cache->io_list, io); | |
3503 | } else { | |
3504 | /* | |
3505 | * if we failed to write the cache, the | |
3506 | * generation will be bad and life goes on | |
3507 | */ | |
3508 | ret = 0; | |
3509 | } | |
3510 | } | |
ff1f8250 | 3511 | if (!ret) { |
1bbc621e | 3512 | ret = write_one_cache_group(trans, root, path, cache); |
ff1f8250 FM |
3513 | /* |
3514 | * Our block group might still be attached to the list | |
3515 | * of new block groups in the transaction handle of some | |
3516 | * other task (struct btrfs_trans_handle->new_bgs). This | |
3517 | * means its block group item isn't yet in the extent | |
3518 | * tree. If this happens ignore the error, as we will | |
3519 | * try again later in the critical section of the | |
3520 | * transaction commit. | |
3521 | */ | |
3522 | if (ret == -ENOENT) { | |
3523 | ret = 0; | |
3524 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3525 | if (list_empty(&cache->dirty_list)) { | |
3526 | list_add_tail(&cache->dirty_list, | |
3527 | &cur_trans->dirty_bgs); | |
3528 | btrfs_get_block_group(cache); | |
3529 | } | |
3530 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3531 | } else if (ret) { | |
3532 | btrfs_abort_transaction(trans, root, ret); | |
3533 | } | |
3534 | } | |
1bbc621e CM |
3535 | |
3536 | /* if its not on the io list, we need to put the block group */ | |
3537 | if (should_put) | |
3538 | btrfs_put_block_group(cache); | |
3539 | ||
3540 | if (ret) | |
3541 | break; | |
b58d1a9e FM |
3542 | |
3543 | /* | |
3544 | * Avoid blocking other tasks for too long. It might even save | |
3545 | * us from writing caches for block groups that are going to be | |
3546 | * removed. | |
3547 | */ | |
3548 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
3549 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e | 3550 | } |
b58d1a9e | 3551 | mutex_unlock(&trans->transaction->cache_write_mutex); |
1bbc621e CM |
3552 | |
3553 | /* | |
3554 | * go through delayed refs for all the stuff we've just kicked off | |
3555 | * and then loop back (just once) | |
3556 | */ | |
3557 | ret = btrfs_run_delayed_refs(trans, root, 0); | |
3558 | if (!ret && loops == 0) { | |
3559 | loops++; | |
3560 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3561 | list_splice_init(&cur_trans->dirty_bgs, &dirty); | |
b58d1a9e FM |
3562 | /* |
3563 | * dirty_bgs_lock protects us from concurrent block group | |
3564 | * deletes too (not just cache_write_mutex). | |
3565 | */ | |
3566 | if (!list_empty(&dirty)) { | |
3567 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3568 | goto again; | |
3569 | } | |
1bbc621e | 3570 | spin_unlock(&cur_trans->dirty_bgs_lock); |
1bbc621e CM |
3571 | } |
3572 | ||
3573 | btrfs_free_path(path); | |
3574 | return ret; | |
3575 | } | |
3576 | ||
3577 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, | |
3578 | struct btrfs_root *root) | |
3579 | { | |
3580 | struct btrfs_block_group_cache *cache; | |
3581 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3582 | int ret = 0; | |
3583 | int should_put; | |
3584 | struct btrfs_path *path; | |
3585 | struct list_head *io = &cur_trans->io_bgs; | |
3586 | int num_started = 0; | |
9078a3e1 CM |
3587 | |
3588 | path = btrfs_alloc_path(); | |
3589 | if (!path) | |
3590 | return -ENOMEM; | |
3591 | ||
ce93ec54 JB |
3592 | /* |
3593 | * We don't need the lock here since we are protected by the transaction | |
3594 | * commit. We want to do the cache_save_setup first and then run the | |
3595 | * delayed refs to make sure we have the best chance at doing this all | |
3596 | * in one shot. | |
3597 | */ | |
3598 | while (!list_empty(&cur_trans->dirty_bgs)) { | |
3599 | cache = list_first_entry(&cur_trans->dirty_bgs, | |
3600 | struct btrfs_block_group_cache, | |
3601 | dirty_list); | |
c9dc4c65 CM |
3602 | |
3603 | /* | |
3604 | * this can happen if cache_save_setup re-dirties a block | |
3605 | * group that is already under IO. Just wait for it to | |
3606 | * finish and then do it all again | |
3607 | */ | |
3608 | if (!list_empty(&cache->io_list)) { | |
3609 | list_del_init(&cache->io_list); | |
3610 | btrfs_wait_cache_io(root, trans, cache, | |
3611 | &cache->io_ctl, path, | |
3612 | cache->key.objectid); | |
3613 | btrfs_put_block_group(cache); | |
c9dc4c65 CM |
3614 | } |
3615 | ||
1bbc621e CM |
3616 | /* |
3617 | * don't remove from the dirty list until after we've waited | |
3618 | * on any pending IO | |
3619 | */ | |
ce93ec54 | 3620 | list_del_init(&cache->dirty_list); |
c9dc4c65 CM |
3621 | should_put = 1; |
3622 | ||
1bbc621e | 3623 | cache_save_setup(cache, trans, path); |
c9dc4c65 | 3624 | |
ce93ec54 | 3625 | if (!ret) |
c9dc4c65 CM |
3626 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long) -1); |
3627 | ||
3628 | if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3629 | cache->io_ctl.inode = NULL; | |
3630 | ret = btrfs_write_out_cache(root, trans, cache, path); | |
3631 | if (ret == 0 && cache->io_ctl.inode) { | |
3632 | num_started++; | |
3633 | should_put = 0; | |
1bbc621e | 3634 | list_add_tail(&cache->io_list, io); |
c9dc4c65 CM |
3635 | } else { |
3636 | /* | |
3637 | * if we failed to write the cache, the | |
3638 | * generation will be bad and life goes on | |
3639 | */ | |
3640 | ret = 0; | |
3641 | } | |
3642 | } | |
ff1f8250 | 3643 | if (!ret) { |
ce93ec54 | 3644 | ret = write_one_cache_group(trans, root, path, cache); |
ff1f8250 FM |
3645 | if (ret) |
3646 | btrfs_abort_transaction(trans, root, ret); | |
3647 | } | |
c9dc4c65 CM |
3648 | |
3649 | /* if its not on the io list, we need to put the block group */ | |
3650 | if (should_put) | |
3651 | btrfs_put_block_group(cache); | |
3652 | } | |
3653 | ||
1bbc621e CM |
3654 | while (!list_empty(io)) { |
3655 | cache = list_first_entry(io, struct btrfs_block_group_cache, | |
c9dc4c65 CM |
3656 | io_list); |
3657 | list_del_init(&cache->io_list); | |
c9dc4c65 CM |
3658 | btrfs_wait_cache_io(root, trans, cache, |
3659 | &cache->io_ctl, path, cache->key.objectid); | |
0cb59c99 JB |
3660 | btrfs_put_block_group(cache); |
3661 | } | |
3662 | ||
9078a3e1 | 3663 | btrfs_free_path(path); |
ce93ec54 | 3664 | return ret; |
9078a3e1 CM |
3665 | } |
3666 | ||
d2fb3437 YZ |
3667 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3668 | { | |
3669 | struct btrfs_block_group_cache *block_group; | |
3670 | int readonly = 0; | |
3671 | ||
3672 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3673 | if (!block_group || block_group->ro) | |
3674 | readonly = 1; | |
3675 | if (block_group) | |
fa9c0d79 | 3676 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3677 | return readonly; |
3678 | } | |
3679 | ||
6ab0a202 JM |
3680 | static const char *alloc_name(u64 flags) |
3681 | { | |
3682 | switch (flags) { | |
3683 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
3684 | return "mixed"; | |
3685 | case BTRFS_BLOCK_GROUP_METADATA: | |
3686 | return "metadata"; | |
3687 | case BTRFS_BLOCK_GROUP_DATA: | |
3688 | return "data"; | |
3689 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
3690 | return "system"; | |
3691 | default: | |
3692 | WARN_ON(1); | |
3693 | return "invalid-combination"; | |
3694 | }; | |
3695 | } | |
3696 | ||
593060d7 CM |
3697 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3698 | u64 total_bytes, u64 bytes_used, | |
3699 | struct btrfs_space_info **space_info) | |
3700 | { | |
3701 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3702 | int i; |
3703 | int factor; | |
b150a4f1 | 3704 | int ret; |
b742bb82 YZ |
3705 | |
3706 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3707 | BTRFS_BLOCK_GROUP_RAID10)) | |
3708 | factor = 2; | |
3709 | else | |
3710 | factor = 1; | |
593060d7 CM |
3711 | |
3712 | found = __find_space_info(info, flags); | |
3713 | if (found) { | |
25179201 | 3714 | spin_lock(&found->lock); |
593060d7 | 3715 | found->total_bytes += total_bytes; |
89a55897 | 3716 | found->disk_total += total_bytes * factor; |
593060d7 | 3717 | found->bytes_used += bytes_used; |
b742bb82 | 3718 | found->disk_used += bytes_used * factor; |
2e6e5183 FM |
3719 | if (total_bytes > 0) |
3720 | found->full = 0; | |
25179201 | 3721 | spin_unlock(&found->lock); |
593060d7 CM |
3722 | *space_info = found; |
3723 | return 0; | |
3724 | } | |
c146afad | 3725 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3726 | if (!found) |
3727 | return -ENOMEM; | |
3728 | ||
908c7f19 | 3729 | ret = percpu_counter_init(&found->total_bytes_pinned, 0, GFP_KERNEL); |
b150a4f1 JB |
3730 | if (ret) { |
3731 | kfree(found); | |
3732 | return ret; | |
3733 | } | |
3734 | ||
c1895442 | 3735 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
b742bb82 | 3736 | INIT_LIST_HEAD(&found->block_groups[i]); |
80eb234a | 3737 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3738 | spin_lock_init(&found->lock); |
52ba6929 | 3739 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3740 | found->total_bytes = total_bytes; |
89a55897 | 3741 | found->disk_total = total_bytes * factor; |
593060d7 | 3742 | found->bytes_used = bytes_used; |
b742bb82 | 3743 | found->disk_used = bytes_used * factor; |
593060d7 | 3744 | found->bytes_pinned = 0; |
e8569813 | 3745 | found->bytes_reserved = 0; |
c146afad | 3746 | found->bytes_readonly = 0; |
f0486c68 | 3747 | found->bytes_may_use = 0; |
6af3e3ad | 3748 | found->full = 0; |
0e4f8f88 | 3749 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3750 | found->chunk_alloc = 0; |
fdb5effd JB |
3751 | found->flush = 0; |
3752 | init_waitqueue_head(&found->wait); | |
633c0aad | 3753 | INIT_LIST_HEAD(&found->ro_bgs); |
6ab0a202 JM |
3754 | |
3755 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, | |
3756 | info->space_info_kobj, "%s", | |
3757 | alloc_name(found->flags)); | |
3758 | if (ret) { | |
3759 | kfree(found); | |
3760 | return ret; | |
3761 | } | |
3762 | ||
593060d7 | 3763 | *space_info = found; |
4184ea7f | 3764 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3765 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3766 | info->data_sinfo = found; | |
6ab0a202 JM |
3767 | |
3768 | return ret; | |
593060d7 CM |
3769 | } |
3770 | ||
8790d502 CM |
3771 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3772 | { | |
899c81ea ID |
3773 | u64 extra_flags = chunk_to_extended(flags) & |
3774 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3775 | |
de98ced9 | 3776 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3777 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3778 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3779 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3780 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3781 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3782 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3783 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3784 | } |
593060d7 | 3785 | |
fc67c450 ID |
3786 | /* |
3787 | * returns target flags in extended format or 0 if restripe for this | |
3788 | * chunk_type is not in progress | |
c6664b42 ID |
3789 | * |
3790 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3791 | */ |
3792 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3793 | { | |
3794 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3795 | u64 target = 0; | |
3796 | ||
fc67c450 ID |
3797 | if (!bctl) |
3798 | return 0; | |
3799 | ||
3800 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3801 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3802 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3803 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3804 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3805 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3806 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3807 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3808 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3809 | } | |
3810 | ||
3811 | return target; | |
3812 | } | |
3813 | ||
a46d11a8 ID |
3814 | /* |
3815 | * @flags: available profiles in extended format (see ctree.h) | |
3816 | * | |
e4d8ec0f ID |
3817 | * Returns reduced profile in chunk format. If profile changing is in |
3818 | * progress (either running or paused) picks the target profile (if it's | |
3819 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3820 | */ |
48a3b636 | 3821 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3822 | { |
95669976 | 3823 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
fc67c450 | 3824 | u64 target; |
9c170b26 ZL |
3825 | u64 raid_type; |
3826 | u64 allowed = 0; | |
a061fc8d | 3827 | |
fc67c450 ID |
3828 | /* |
3829 | * see if restripe for this chunk_type is in progress, if so | |
3830 | * try to reduce to the target profile | |
3831 | */ | |
e4d8ec0f | 3832 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3833 | target = get_restripe_target(root->fs_info, flags); |
3834 | if (target) { | |
3835 | /* pick target profile only if it's already available */ | |
3836 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3837 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3838 | return extended_to_chunk(target); |
e4d8ec0f ID |
3839 | } |
3840 | } | |
3841 | spin_unlock(&root->fs_info->balance_lock); | |
3842 | ||
53b381b3 | 3843 | /* First, mask out the RAID levels which aren't possible */ |
9c170b26 ZL |
3844 | for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { |
3845 | if (num_devices >= btrfs_raid_array[raid_type].devs_min) | |
3846 | allowed |= btrfs_raid_group[raid_type]; | |
3847 | } | |
3848 | allowed &= flags; | |
3849 | ||
3850 | if (allowed & BTRFS_BLOCK_GROUP_RAID6) | |
3851 | allowed = BTRFS_BLOCK_GROUP_RAID6; | |
3852 | else if (allowed & BTRFS_BLOCK_GROUP_RAID5) | |
3853 | allowed = BTRFS_BLOCK_GROUP_RAID5; | |
3854 | else if (allowed & BTRFS_BLOCK_GROUP_RAID10) | |
3855 | allowed = BTRFS_BLOCK_GROUP_RAID10; | |
3856 | else if (allowed & BTRFS_BLOCK_GROUP_RAID1) | |
3857 | allowed = BTRFS_BLOCK_GROUP_RAID1; | |
3858 | else if (allowed & BTRFS_BLOCK_GROUP_RAID0) | |
3859 | allowed = BTRFS_BLOCK_GROUP_RAID0; | |
3860 | ||
3861 | flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK; | |
3862 | ||
3863 | return extended_to_chunk(flags | allowed); | |
ec44a35c CM |
3864 | } |
3865 | ||
f8213bdc | 3866 | static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags) |
6a63209f | 3867 | { |
de98ced9 | 3868 | unsigned seq; |
f8213bdc | 3869 | u64 flags; |
de98ced9 MX |
3870 | |
3871 | do { | |
f8213bdc | 3872 | flags = orig_flags; |
de98ced9 MX |
3873 | seq = read_seqbegin(&root->fs_info->profiles_lock); |
3874 | ||
3875 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3876 | flags |= root->fs_info->avail_data_alloc_bits; | |
3877 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3878 | flags |= root->fs_info->avail_system_alloc_bits; | |
3879 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3880 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3881 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3882 | |
b742bb82 | 3883 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3884 | } |
3885 | ||
6d07bcec | 3886 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3887 | { |
b742bb82 | 3888 | u64 flags; |
53b381b3 | 3889 | u64 ret; |
9ed74f2d | 3890 | |
b742bb82 YZ |
3891 | if (data) |
3892 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3893 | else if (root == root->fs_info->chunk_root) | |
3894 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3895 | else |
b742bb82 | 3896 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3897 | |
53b381b3 DW |
3898 | ret = get_alloc_profile(root, flags); |
3899 | return ret; | |
6a63209f | 3900 | } |
9ed74f2d | 3901 | |
6a63209f | 3902 | /* |
6a63209f JB |
3903 | * This will check the space that the inode allocates from to make sure we have |
3904 | * enough space for bytes. | |
6a63209f | 3905 | */ |
e2d1f923 | 3906 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes) |
6a63209f | 3907 | { |
6a63209f | 3908 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3909 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3910 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3911 | u64 used; |
94b947b2 | 3912 | int ret = 0; |
c99f1b0c ZL |
3913 | int need_commit = 2; |
3914 | int have_pinned_space; | |
6a63209f | 3915 | |
6a63209f | 3916 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3917 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3918 | |
9dced186 | 3919 | if (btrfs_is_free_space_inode(inode)) { |
c99f1b0c | 3920 | need_commit = 0; |
9dced186 | 3921 | ASSERT(current->journal_info); |
0af3d00b JB |
3922 | } |
3923 | ||
b4d7c3c9 | 3924 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3925 | if (!data_sinfo) |
3926 | goto alloc; | |
9ed74f2d | 3927 | |
6a63209f JB |
3928 | again: |
3929 | /* make sure we have enough space to handle the data first */ | |
3930 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3931 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3932 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3933 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3934 | |
3935 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3936 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3937 | |
6a63209f JB |
3938 | /* |
3939 | * if we don't have enough free bytes in this space then we need | |
3940 | * to alloc a new chunk. | |
3941 | */ | |
b9fd47cd | 3942 | if (!data_sinfo->full) { |
6a63209f | 3943 | u64 alloc_target; |
9ed74f2d | 3944 | |
0e4f8f88 | 3945 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3946 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3947 | alloc: |
6a63209f | 3948 | alloc_target = btrfs_get_alloc_profile(root, 1); |
9dced186 MX |
3949 | /* |
3950 | * It is ugly that we don't call nolock join | |
3951 | * transaction for the free space inode case here. | |
3952 | * But it is safe because we only do the data space | |
3953 | * reservation for the free space cache in the | |
3954 | * transaction context, the common join transaction | |
3955 | * just increase the counter of the current transaction | |
3956 | * handler, doesn't try to acquire the trans_lock of | |
3957 | * the fs. | |
3958 | */ | |
7a7eaa40 | 3959 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3960 | if (IS_ERR(trans)) |
3961 | return PTR_ERR(trans); | |
9ed74f2d | 3962 | |
6a63209f | 3963 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3964 | alloc_target, |
3965 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3966 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3967 | if (ret < 0) { |
3968 | if (ret != -ENOSPC) | |
3969 | return ret; | |
c99f1b0c ZL |
3970 | else { |
3971 | have_pinned_space = 1; | |
d52a5b5f | 3972 | goto commit_trans; |
c99f1b0c | 3973 | } |
d52a5b5f | 3974 | } |
9ed74f2d | 3975 | |
b4d7c3c9 LZ |
3976 | if (!data_sinfo) |
3977 | data_sinfo = fs_info->data_sinfo; | |
3978 | ||
6a63209f JB |
3979 | goto again; |
3980 | } | |
f2bb8f5c JB |
3981 | |
3982 | /* | |
b150a4f1 | 3983 | * If we don't have enough pinned space to deal with this |
94b947b2 ZL |
3984 | * allocation, and no removed chunk in current transaction, |
3985 | * don't bother committing the transaction. | |
f2bb8f5c | 3986 | */ |
c99f1b0c ZL |
3987 | have_pinned_space = percpu_counter_compare( |
3988 | &data_sinfo->total_bytes_pinned, | |
3989 | used + bytes - data_sinfo->total_bytes); | |
6a63209f | 3990 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3991 | |
4e06bdd6 | 3992 | /* commit the current transaction and try again */ |
d52a5b5f | 3993 | commit_trans: |
c99f1b0c | 3994 | if (need_commit && |
a4abeea4 | 3995 | !atomic_read(&root->fs_info->open_ioctl_trans)) { |
c99f1b0c | 3996 | need_commit--; |
b150a4f1 | 3997 | |
9a4e7276 ZL |
3998 | if (need_commit > 0) |
3999 | btrfs_wait_ordered_roots(fs_info, -1); | |
4000 | ||
7a7eaa40 | 4001 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
4002 | if (IS_ERR(trans)) |
4003 | return PTR_ERR(trans); | |
c99f1b0c ZL |
4004 | if (have_pinned_space >= 0 || |
4005 | trans->transaction->have_free_bgs || | |
4006 | need_commit > 0) { | |
94b947b2 ZL |
4007 | ret = btrfs_commit_transaction(trans, root); |
4008 | if (ret) | |
4009 | return ret; | |
d7c15171 ZL |
4010 | /* |
4011 | * make sure that all running delayed iput are | |
4012 | * done | |
4013 | */ | |
4014 | down_write(&root->fs_info->delayed_iput_sem); | |
4015 | up_write(&root->fs_info->delayed_iput_sem); | |
94b947b2 ZL |
4016 | goto again; |
4017 | } else { | |
4018 | btrfs_end_transaction(trans, root); | |
4019 | } | |
4e06bdd6 | 4020 | } |
9ed74f2d | 4021 | |
cab45e22 JM |
4022 | trace_btrfs_space_reservation(root->fs_info, |
4023 | "space_info:enospc", | |
4024 | data_sinfo->flags, bytes, 1); | |
6a63209f JB |
4025 | return -ENOSPC; |
4026 | } | |
e2d1f923 | 4027 | ret = btrfs_qgroup_reserve(root, write_bytes); |
237c0e9f DY |
4028 | if (ret) |
4029 | goto out; | |
6a63209f | 4030 | data_sinfo->bytes_may_use += bytes; |
8c2a3ca2 | 4031 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 4032 | data_sinfo->flags, bytes, 1); |
237c0e9f | 4033 | out: |
6a63209f | 4034 | spin_unlock(&data_sinfo->lock); |
6a63209f | 4035 | |
237c0e9f | 4036 | return ret; |
9ed74f2d | 4037 | } |
6a63209f | 4038 | |
6a63209f | 4039 | /* |
fb25e914 | 4040 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 4041 | */ |
0ca1f7ce | 4042 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 4043 | { |
0ca1f7ce | 4044 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 4045 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 4046 | |
6a63209f | 4047 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 4048 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 4049 | |
b4d7c3c9 | 4050 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f | 4051 | spin_lock(&data_sinfo->lock); |
7ee9e440 | 4052 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
6a63209f | 4053 | data_sinfo->bytes_may_use -= bytes; |
8c2a3ca2 | 4054 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 4055 | data_sinfo->flags, bytes, 0); |
6a63209f | 4056 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
4057 | } |
4058 | ||
97e728d4 | 4059 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 4060 | { |
97e728d4 JB |
4061 | struct list_head *head = &info->space_info; |
4062 | struct btrfs_space_info *found; | |
e3ccfa98 | 4063 | |
97e728d4 JB |
4064 | rcu_read_lock(); |
4065 | list_for_each_entry_rcu(found, head, list) { | |
4066 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 4067 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 4068 | } |
97e728d4 | 4069 | rcu_read_unlock(); |
e3ccfa98 JB |
4070 | } |
4071 | ||
3c76cd84 MX |
4072 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
4073 | { | |
4074 | return (global->size << 1); | |
4075 | } | |
4076 | ||
e5bc2458 | 4077 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 4078 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 4079 | { |
fb25e914 | 4080 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 4081 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 4082 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 4083 | u64 thresh; |
e3ccfa98 | 4084 | |
0e4f8f88 CM |
4085 | if (force == CHUNK_ALLOC_FORCE) |
4086 | return 1; | |
4087 | ||
fb25e914 JB |
4088 | /* |
4089 | * We need to take into account the global rsv because for all intents | |
4090 | * and purposes it's used space. Don't worry about locking the | |
4091 | * global_rsv, it doesn't change except when the transaction commits. | |
4092 | */ | |
54338b5c | 4093 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 4094 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 4095 | |
0e4f8f88 CM |
4096 | /* |
4097 | * in limited mode, we want to have some free space up to | |
4098 | * about 1% of the FS size. | |
4099 | */ | |
4100 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 4101 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
4102 | thresh = max_t(u64, 64 * 1024 * 1024, |
4103 | div_factor_fine(thresh, 1)); | |
4104 | ||
4105 | if (num_bytes - num_allocated < thresh) | |
4106 | return 1; | |
4107 | } | |
0e4f8f88 | 4108 | |
698d0082 | 4109 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 4110 | return 0; |
424499db | 4111 | return 1; |
32c00aff JB |
4112 | } |
4113 | ||
39c2d7fa | 4114 | static u64 get_profile_num_devs(struct btrfs_root *root, u64 type) |
15d1ff81 LB |
4115 | { |
4116 | u64 num_dev; | |
4117 | ||
53b381b3 DW |
4118 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
4119 | BTRFS_BLOCK_GROUP_RAID0 | | |
4120 | BTRFS_BLOCK_GROUP_RAID5 | | |
4121 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
4122 | num_dev = root->fs_info->fs_devices->rw_devices; |
4123 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
4124 | num_dev = 2; | |
4125 | else | |
4126 | num_dev = 1; /* DUP or single */ | |
4127 | ||
39c2d7fa | 4128 | return num_dev; |
15d1ff81 LB |
4129 | } |
4130 | ||
39c2d7fa FM |
4131 | /* |
4132 | * If @is_allocation is true, reserve space in the system space info necessary | |
4133 | * for allocating a chunk, otherwise if it's false, reserve space necessary for | |
4134 | * removing a chunk. | |
4135 | */ | |
4136 | void check_system_chunk(struct btrfs_trans_handle *trans, | |
4137 | struct btrfs_root *root, | |
4617ea3a | 4138 | u64 type) |
15d1ff81 LB |
4139 | { |
4140 | struct btrfs_space_info *info; | |
4141 | u64 left; | |
4142 | u64 thresh; | |
4fbcdf66 | 4143 | int ret = 0; |
39c2d7fa | 4144 | u64 num_devs; |
4fbcdf66 FM |
4145 | |
4146 | /* | |
4147 | * Needed because we can end up allocating a system chunk and for an | |
4148 | * atomic and race free space reservation in the chunk block reserve. | |
4149 | */ | |
4150 | ASSERT(mutex_is_locked(&root->fs_info->chunk_mutex)); | |
15d1ff81 LB |
4151 | |
4152 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
4153 | spin_lock(&info->lock); | |
4154 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
4fbcdf66 FM |
4155 | info->bytes_reserved - info->bytes_readonly - |
4156 | info->bytes_may_use; | |
15d1ff81 LB |
4157 | spin_unlock(&info->lock); |
4158 | ||
39c2d7fa FM |
4159 | num_devs = get_profile_num_devs(root, type); |
4160 | ||
4161 | /* num_devs device items to update and 1 chunk item to add or remove */ | |
4617ea3a FM |
4162 | thresh = btrfs_calc_trunc_metadata_size(root, num_devs) + |
4163 | btrfs_calc_trans_metadata_size(root, 1); | |
39c2d7fa | 4164 | |
15d1ff81 | 4165 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
c2cf52eb SK |
4166 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
4167 | left, thresh, type); | |
15d1ff81 LB |
4168 | dump_space_info(info, 0, 0); |
4169 | } | |
4170 | ||
4171 | if (left < thresh) { | |
4172 | u64 flags; | |
4173 | ||
4174 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
4fbcdf66 FM |
4175 | /* |
4176 | * Ignore failure to create system chunk. We might end up not | |
4177 | * needing it, as we might not need to COW all nodes/leafs from | |
4178 | * the paths we visit in the chunk tree (they were already COWed | |
4179 | * or created in the current transaction for example). | |
4180 | */ | |
4181 | ret = btrfs_alloc_chunk(trans, root, flags); | |
4182 | } | |
4183 | ||
4184 | if (!ret) { | |
4185 | ret = btrfs_block_rsv_add(root->fs_info->chunk_root, | |
4186 | &root->fs_info->chunk_block_rsv, | |
4187 | thresh, BTRFS_RESERVE_NO_FLUSH); | |
4188 | if (!ret) | |
4189 | trans->chunk_bytes_reserved += thresh; | |
15d1ff81 LB |
4190 | } |
4191 | } | |
4192 | ||
6324fbf3 | 4193 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 4194 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 4195 | { |
6324fbf3 | 4196 | struct btrfs_space_info *space_info; |
97e728d4 | 4197 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 4198 | int wait_for_alloc = 0; |
9ed74f2d | 4199 | int ret = 0; |
9ed74f2d | 4200 | |
c6b305a8 JB |
4201 | /* Don't re-enter if we're already allocating a chunk */ |
4202 | if (trans->allocating_chunk) | |
4203 | return -ENOSPC; | |
4204 | ||
6324fbf3 | 4205 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
4206 | if (!space_info) { |
4207 | ret = update_space_info(extent_root->fs_info, flags, | |
4208 | 0, 0, &space_info); | |
79787eaa | 4209 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 4210 | } |
79787eaa | 4211 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 4212 | |
6d74119f | 4213 | again: |
25179201 | 4214 | spin_lock(&space_info->lock); |
9e622d6b | 4215 | if (force < space_info->force_alloc) |
0e4f8f88 | 4216 | force = space_info->force_alloc; |
25179201 | 4217 | if (space_info->full) { |
09fb99a6 FDBM |
4218 | if (should_alloc_chunk(extent_root, space_info, force)) |
4219 | ret = -ENOSPC; | |
4220 | else | |
4221 | ret = 0; | |
25179201 | 4222 | spin_unlock(&space_info->lock); |
09fb99a6 | 4223 | return ret; |
9ed74f2d JB |
4224 | } |
4225 | ||
698d0082 | 4226 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 4227 | spin_unlock(&space_info->lock); |
6d74119f JB |
4228 | return 0; |
4229 | } else if (space_info->chunk_alloc) { | |
4230 | wait_for_alloc = 1; | |
4231 | } else { | |
4232 | space_info->chunk_alloc = 1; | |
9ed74f2d | 4233 | } |
0e4f8f88 | 4234 | |
25179201 | 4235 | spin_unlock(&space_info->lock); |
9ed74f2d | 4236 | |
6d74119f JB |
4237 | mutex_lock(&fs_info->chunk_mutex); |
4238 | ||
4239 | /* | |
4240 | * The chunk_mutex is held throughout the entirety of a chunk | |
4241 | * allocation, so once we've acquired the chunk_mutex we know that the | |
4242 | * other guy is done and we need to recheck and see if we should | |
4243 | * allocate. | |
4244 | */ | |
4245 | if (wait_for_alloc) { | |
4246 | mutex_unlock(&fs_info->chunk_mutex); | |
4247 | wait_for_alloc = 0; | |
4248 | goto again; | |
4249 | } | |
4250 | ||
c6b305a8 JB |
4251 | trans->allocating_chunk = true; |
4252 | ||
67377734 JB |
4253 | /* |
4254 | * If we have mixed data/metadata chunks we want to make sure we keep | |
4255 | * allocating mixed chunks instead of individual chunks. | |
4256 | */ | |
4257 | if (btrfs_mixed_space_info(space_info)) | |
4258 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
4259 | ||
97e728d4 JB |
4260 | /* |
4261 | * if we're doing a data chunk, go ahead and make sure that | |
4262 | * we keep a reasonable number of metadata chunks allocated in the | |
4263 | * FS as well. | |
4264 | */ | |
9ed74f2d | 4265 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
4266 | fs_info->data_chunk_allocations++; |
4267 | if (!(fs_info->data_chunk_allocations % | |
4268 | fs_info->metadata_ratio)) | |
4269 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
4270 | } |
4271 | ||
15d1ff81 LB |
4272 | /* |
4273 | * Check if we have enough space in SYSTEM chunk because we may need | |
4274 | * to update devices. | |
4275 | */ | |
4617ea3a | 4276 | check_system_chunk(trans, extent_root, flags); |
15d1ff81 | 4277 | |
2b82032c | 4278 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 4279 | trans->allocating_chunk = false; |
92b8e897 | 4280 | |
9ed74f2d | 4281 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
4282 | if (ret < 0 && ret != -ENOSPC) |
4283 | goto out; | |
9ed74f2d | 4284 | if (ret) |
6324fbf3 | 4285 | space_info->full = 1; |
424499db YZ |
4286 | else |
4287 | ret = 1; | |
6d74119f | 4288 | |
0e4f8f88 | 4289 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 4290 | out: |
6d74119f | 4291 | space_info->chunk_alloc = 0; |
9ed74f2d | 4292 | spin_unlock(&space_info->lock); |
a25c75d5 | 4293 | mutex_unlock(&fs_info->chunk_mutex); |
00d80e34 FM |
4294 | /* |
4295 | * When we allocate a new chunk we reserve space in the chunk block | |
4296 | * reserve to make sure we can COW nodes/leafs in the chunk tree or | |
4297 | * add new nodes/leafs to it if we end up needing to do it when | |
4298 | * inserting the chunk item and updating device items as part of the | |
4299 | * second phase of chunk allocation, performed by | |
4300 | * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a | |
4301 | * large number of new block groups to create in our transaction | |
4302 | * handle's new_bgs list to avoid exhausting the chunk block reserve | |
4303 | * in extreme cases - like having a single transaction create many new | |
4304 | * block groups when starting to write out the free space caches of all | |
4305 | * the block groups that were made dirty during the lifetime of the | |
4306 | * transaction. | |
4307 | */ | |
d9a0540a FM |
4308 | if (trans->can_flush_pending_bgs && |
4309 | trans->chunk_bytes_reserved >= (2 * 1024 * 1024ull)) { | |
00d80e34 FM |
4310 | btrfs_create_pending_block_groups(trans, trans->root); |
4311 | btrfs_trans_release_chunk_metadata(trans); | |
4312 | } | |
0f9dd46c | 4313 | return ret; |
6324fbf3 | 4314 | } |
9ed74f2d | 4315 | |
a80c8dcf JB |
4316 | static int can_overcommit(struct btrfs_root *root, |
4317 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 4318 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 4319 | { |
96f1bb57 | 4320 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 4321 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 4322 | u64 space_size; |
a80c8dcf JB |
4323 | u64 avail; |
4324 | u64 used; | |
4325 | ||
4326 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
4327 | space_info->bytes_pinned + space_info->bytes_readonly; |
4328 | ||
96f1bb57 JB |
4329 | /* |
4330 | * We only want to allow over committing if we have lots of actual space | |
4331 | * free, but if we don't have enough space to handle the global reserve | |
4332 | * space then we could end up having a real enospc problem when trying | |
4333 | * to allocate a chunk or some other such important allocation. | |
4334 | */ | |
3c76cd84 MX |
4335 | spin_lock(&global_rsv->lock); |
4336 | space_size = calc_global_rsv_need_space(global_rsv); | |
4337 | spin_unlock(&global_rsv->lock); | |
4338 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
4339 | return 0; |
4340 | ||
4341 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
4342 | |
4343 | spin_lock(&root->fs_info->free_chunk_lock); | |
4344 | avail = root->fs_info->free_chunk_space; | |
4345 | spin_unlock(&root->fs_info->free_chunk_lock); | |
4346 | ||
4347 | /* | |
4348 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
4349 | * space is actually useable. For raid56, the space info used |
4350 | * doesn't include the parity drive, so we don't have to | |
4351 | * change the math | |
a80c8dcf JB |
4352 | */ |
4353 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
4354 | BTRFS_BLOCK_GROUP_RAID1 | | |
4355 | BTRFS_BLOCK_GROUP_RAID10)) | |
4356 | avail >>= 1; | |
4357 | ||
4358 | /* | |
561c294d MX |
4359 | * If we aren't flushing all things, let us overcommit up to |
4360 | * 1/2th of the space. If we can flush, don't let us overcommit | |
4361 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 4362 | */ |
08e007d2 | 4363 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
14575aef | 4364 | avail >>= 3; |
a80c8dcf | 4365 | else |
14575aef | 4366 | avail >>= 1; |
a80c8dcf | 4367 | |
14575aef | 4368 | if (used + bytes < space_info->total_bytes + avail) |
a80c8dcf JB |
4369 | return 1; |
4370 | return 0; | |
4371 | } | |
4372 | ||
48a3b636 | 4373 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
6c255e67 | 4374 | unsigned long nr_pages, int nr_items) |
da633a42 MX |
4375 | { |
4376 | struct super_block *sb = root->fs_info->sb; | |
da633a42 | 4377 | |
925a6efb JB |
4378 | if (down_read_trylock(&sb->s_umount)) { |
4379 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
4380 | up_read(&sb->s_umount); | |
4381 | } else { | |
da633a42 MX |
4382 | /* |
4383 | * We needn't worry the filesystem going from r/w to r/o though | |
4384 | * we don't acquire ->s_umount mutex, because the filesystem | |
4385 | * should guarantee the delalloc inodes list be empty after | |
4386 | * the filesystem is readonly(all dirty pages are written to | |
4387 | * the disk). | |
4388 | */ | |
6c255e67 | 4389 | btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); |
98ad69cf | 4390 | if (!current->journal_info) |
6c255e67 | 4391 | btrfs_wait_ordered_roots(root->fs_info, nr_items); |
da633a42 MX |
4392 | } |
4393 | } | |
4394 | ||
18cd8ea6 MX |
4395 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) |
4396 | { | |
4397 | u64 bytes; | |
4398 | int nr; | |
4399 | ||
4400 | bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4401 | nr = (int)div64_u64(to_reclaim, bytes); | |
4402 | if (!nr) | |
4403 | nr = 1; | |
4404 | return nr; | |
4405 | } | |
4406 | ||
c61a16a7 MX |
4407 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) |
4408 | ||
9ed74f2d | 4409 | /* |
5da9d01b | 4410 | * shrink metadata reservation for delalloc |
9ed74f2d | 4411 | */ |
f4c738c2 JB |
4412 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
4413 | bool wait_ordered) | |
5da9d01b | 4414 | { |
0ca1f7ce | 4415 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 4416 | struct btrfs_space_info *space_info; |
663350ac | 4417 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4418 | u64 delalloc_bytes; |
5da9d01b | 4419 | u64 max_reclaim; |
b1953bce | 4420 | long time_left; |
d3ee29e3 MX |
4421 | unsigned long nr_pages; |
4422 | int loops; | |
b0244199 | 4423 | int items; |
08e007d2 | 4424 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 4425 | |
c61a16a7 | 4426 | /* Calc the number of the pages we need flush for space reservation */ |
b0244199 MX |
4427 | items = calc_reclaim_items_nr(root, to_reclaim); |
4428 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; | |
c61a16a7 | 4429 | |
663350ac | 4430 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 4431 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 4432 | space_info = block_rsv->space_info; |
bf9022e0 | 4433 | |
963d678b MX |
4434 | delalloc_bytes = percpu_counter_sum_positive( |
4435 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 4436 | if (delalloc_bytes == 0) { |
fdb5effd | 4437 | if (trans) |
f4c738c2 | 4438 | return; |
38c135af | 4439 | if (wait_ordered) |
b0244199 | 4440 | btrfs_wait_ordered_roots(root->fs_info, items); |
f4c738c2 | 4441 | return; |
fdb5effd JB |
4442 | } |
4443 | ||
d3ee29e3 | 4444 | loops = 0; |
f4c738c2 JB |
4445 | while (delalloc_bytes && loops < 3) { |
4446 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
4447 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
6c255e67 | 4448 | btrfs_writeback_inodes_sb_nr(root, nr_pages, items); |
dea31f52 JB |
4449 | /* |
4450 | * We need to wait for the async pages to actually start before | |
4451 | * we do anything. | |
4452 | */ | |
9f3a074d MX |
4453 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); |
4454 | if (!max_reclaim) | |
4455 | goto skip_async; | |
4456 | ||
4457 | if (max_reclaim <= nr_pages) | |
4458 | max_reclaim = 0; | |
4459 | else | |
4460 | max_reclaim -= nr_pages; | |
dea31f52 | 4461 | |
9f3a074d MX |
4462 | wait_event(root->fs_info->async_submit_wait, |
4463 | atomic_read(&root->fs_info->async_delalloc_pages) <= | |
4464 | (int)max_reclaim); | |
4465 | skip_async: | |
08e007d2 MX |
4466 | if (!trans) |
4467 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4468 | else | |
4469 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 4470 | spin_lock(&space_info->lock); |
08e007d2 | 4471 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4472 | spin_unlock(&space_info->lock); |
4473 | break; | |
4474 | } | |
0019f10d | 4475 | spin_unlock(&space_info->lock); |
5da9d01b | 4476 | |
36e39c40 | 4477 | loops++; |
f104d044 | 4478 | if (wait_ordered && !trans) { |
b0244199 | 4479 | btrfs_wait_ordered_roots(root->fs_info, items); |
f104d044 | 4480 | } else { |
f4c738c2 | 4481 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4482 | if (time_left) |
4483 | break; | |
4484 | } | |
963d678b MX |
4485 | delalloc_bytes = percpu_counter_sum_positive( |
4486 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4487 | } |
5da9d01b YZ |
4488 | } |
4489 | ||
663350ac JB |
4490 | /** |
4491 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4492 | * @root - the root we're allocating for | |
4493 | * @bytes - the number of bytes we want to reserve | |
4494 | * @force - force the commit | |
8bb8ab2e | 4495 | * |
663350ac JB |
4496 | * This will check to make sure that committing the transaction will actually |
4497 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4498 | * will return -ENOSPC. | |
8bb8ab2e | 4499 | */ |
663350ac JB |
4500 | static int may_commit_transaction(struct btrfs_root *root, |
4501 | struct btrfs_space_info *space_info, | |
4502 | u64 bytes, int force) | |
4503 | { | |
4504 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4505 | struct btrfs_trans_handle *trans; | |
4506 | ||
4507 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4508 | if (trans) | |
4509 | return -EAGAIN; | |
4510 | ||
4511 | if (force) | |
4512 | goto commit; | |
4513 | ||
4514 | /* See if there is enough pinned space to make this reservation */ | |
b150a4f1 | 4515 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
0424c548 | 4516 | bytes) >= 0) |
663350ac | 4517 | goto commit; |
663350ac JB |
4518 | |
4519 | /* | |
4520 | * See if there is some space in the delayed insertion reservation for | |
4521 | * this reservation. | |
4522 | */ | |
4523 | if (space_info != delayed_rsv->space_info) | |
4524 | return -ENOSPC; | |
4525 | ||
4526 | spin_lock(&delayed_rsv->lock); | |
b150a4f1 JB |
4527 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4528 | bytes - delayed_rsv->size) >= 0) { | |
663350ac JB |
4529 | spin_unlock(&delayed_rsv->lock); |
4530 | return -ENOSPC; | |
4531 | } | |
4532 | spin_unlock(&delayed_rsv->lock); | |
4533 | ||
4534 | commit: | |
4535 | trans = btrfs_join_transaction(root); | |
4536 | if (IS_ERR(trans)) | |
4537 | return -ENOSPC; | |
4538 | ||
4539 | return btrfs_commit_transaction(trans, root); | |
4540 | } | |
4541 | ||
96c3f433 | 4542 | enum flush_state { |
67b0fd63 JB |
4543 | FLUSH_DELAYED_ITEMS_NR = 1, |
4544 | FLUSH_DELAYED_ITEMS = 2, | |
4545 | FLUSH_DELALLOC = 3, | |
4546 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4547 | ALLOC_CHUNK = 5, |
4548 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4549 | }; |
4550 | ||
4551 | static int flush_space(struct btrfs_root *root, | |
4552 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4553 | u64 orig_bytes, int state) | |
4554 | { | |
4555 | struct btrfs_trans_handle *trans; | |
4556 | int nr; | |
f4c738c2 | 4557 | int ret = 0; |
96c3f433 JB |
4558 | |
4559 | switch (state) { | |
96c3f433 JB |
4560 | case FLUSH_DELAYED_ITEMS_NR: |
4561 | case FLUSH_DELAYED_ITEMS: | |
18cd8ea6 MX |
4562 | if (state == FLUSH_DELAYED_ITEMS_NR) |
4563 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; | |
4564 | else | |
96c3f433 | 4565 | nr = -1; |
18cd8ea6 | 4566 | |
96c3f433 JB |
4567 | trans = btrfs_join_transaction(root); |
4568 | if (IS_ERR(trans)) { | |
4569 | ret = PTR_ERR(trans); | |
4570 | break; | |
4571 | } | |
4572 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4573 | btrfs_end_transaction(trans, root); | |
4574 | break; | |
67b0fd63 JB |
4575 | case FLUSH_DELALLOC: |
4576 | case FLUSH_DELALLOC_WAIT: | |
24af7dd1 | 4577 | shrink_delalloc(root, num_bytes * 2, orig_bytes, |
67b0fd63 JB |
4578 | state == FLUSH_DELALLOC_WAIT); |
4579 | break; | |
ea658bad JB |
4580 | case ALLOC_CHUNK: |
4581 | trans = btrfs_join_transaction(root); | |
4582 | if (IS_ERR(trans)) { | |
4583 | ret = PTR_ERR(trans); | |
4584 | break; | |
4585 | } | |
4586 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4587 | btrfs_get_alloc_profile(root, 0), |
4588 | CHUNK_ALLOC_NO_FORCE); | |
4589 | btrfs_end_transaction(trans, root); | |
4590 | if (ret == -ENOSPC) | |
4591 | ret = 0; | |
4592 | break; | |
96c3f433 JB |
4593 | case COMMIT_TRANS: |
4594 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4595 | break; | |
4596 | default: | |
4597 | ret = -ENOSPC; | |
4598 | break; | |
4599 | } | |
4600 | ||
4601 | return ret; | |
4602 | } | |
21c7e756 MX |
4603 | |
4604 | static inline u64 | |
4605 | btrfs_calc_reclaim_metadata_size(struct btrfs_root *root, | |
4606 | struct btrfs_space_info *space_info) | |
4607 | { | |
4608 | u64 used; | |
4609 | u64 expected; | |
4610 | u64 to_reclaim; | |
4611 | ||
4612 | to_reclaim = min_t(u64, num_online_cpus() * 1024 * 1024, | |
4613 | 16 * 1024 * 1024); | |
4614 | spin_lock(&space_info->lock); | |
4615 | if (can_overcommit(root, space_info, to_reclaim, | |
4616 | BTRFS_RESERVE_FLUSH_ALL)) { | |
4617 | to_reclaim = 0; | |
4618 | goto out; | |
4619 | } | |
4620 | ||
4621 | used = space_info->bytes_used + space_info->bytes_reserved + | |
4622 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4623 | space_info->bytes_may_use; | |
4624 | if (can_overcommit(root, space_info, 1024 * 1024, | |
4625 | BTRFS_RESERVE_FLUSH_ALL)) | |
4626 | expected = div_factor_fine(space_info->total_bytes, 95); | |
4627 | else | |
4628 | expected = div_factor_fine(space_info->total_bytes, 90); | |
4629 | ||
4630 | if (used > expected) | |
4631 | to_reclaim = used - expected; | |
4632 | else | |
4633 | to_reclaim = 0; | |
4634 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + | |
4635 | space_info->bytes_reserved); | |
4636 | out: | |
4637 | spin_unlock(&space_info->lock); | |
4638 | ||
4639 | return to_reclaim; | |
4640 | } | |
4641 | ||
4642 | static inline int need_do_async_reclaim(struct btrfs_space_info *space_info, | |
4643 | struct btrfs_fs_info *fs_info, u64 used) | |
4644 | { | |
365c5313 JB |
4645 | u64 thresh = div_factor_fine(space_info->total_bytes, 98); |
4646 | ||
4647 | /* If we're just plain full then async reclaim just slows us down. */ | |
4648 | if (space_info->bytes_used >= thresh) | |
4649 | return 0; | |
4650 | ||
4651 | return (used >= thresh && !btrfs_fs_closing(fs_info) && | |
21c7e756 MX |
4652 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); |
4653 | } | |
4654 | ||
4655 | static int btrfs_need_do_async_reclaim(struct btrfs_space_info *space_info, | |
25ce459c LB |
4656 | struct btrfs_fs_info *fs_info, |
4657 | int flush_state) | |
21c7e756 MX |
4658 | { |
4659 | u64 used; | |
4660 | ||
4661 | spin_lock(&space_info->lock); | |
25ce459c LB |
4662 | /* |
4663 | * We run out of space and have not got any free space via flush_space, | |
4664 | * so don't bother doing async reclaim. | |
4665 | */ | |
4666 | if (flush_state > COMMIT_TRANS && space_info->full) { | |
4667 | spin_unlock(&space_info->lock); | |
4668 | return 0; | |
4669 | } | |
4670 | ||
21c7e756 MX |
4671 | used = space_info->bytes_used + space_info->bytes_reserved + |
4672 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4673 | space_info->bytes_may_use; | |
4674 | if (need_do_async_reclaim(space_info, fs_info, used)) { | |
4675 | spin_unlock(&space_info->lock); | |
4676 | return 1; | |
4677 | } | |
4678 | spin_unlock(&space_info->lock); | |
4679 | ||
4680 | return 0; | |
4681 | } | |
4682 | ||
4683 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) | |
4684 | { | |
4685 | struct btrfs_fs_info *fs_info; | |
4686 | struct btrfs_space_info *space_info; | |
4687 | u64 to_reclaim; | |
4688 | int flush_state; | |
4689 | ||
4690 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); | |
4691 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
4692 | ||
4693 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root, | |
4694 | space_info); | |
4695 | if (!to_reclaim) | |
4696 | return; | |
4697 | ||
4698 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
4699 | do { | |
4700 | flush_space(fs_info->fs_root, space_info, to_reclaim, | |
4701 | to_reclaim, flush_state); | |
4702 | flush_state++; | |
25ce459c LB |
4703 | if (!btrfs_need_do_async_reclaim(space_info, fs_info, |
4704 | flush_state)) | |
21c7e756 | 4705 | return; |
365c5313 | 4706 | } while (flush_state < COMMIT_TRANS); |
21c7e756 MX |
4707 | } |
4708 | ||
4709 | void btrfs_init_async_reclaim_work(struct work_struct *work) | |
4710 | { | |
4711 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); | |
4712 | } | |
4713 | ||
4a92b1b8 JB |
4714 | /** |
4715 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4716 | * @root - the root we're allocating for | |
4717 | * @block_rsv - the block_rsv we're allocating for | |
4718 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4719 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4720 | * |
4a92b1b8 JB |
4721 | * This will reserve orgi_bytes number of bytes from the space info associated |
4722 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4723 | * flush out space to make room. It will do this by flushing delalloc if | |
4724 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4725 | * regain reservations will be made and this will fail if there is not enough | |
4726 | * space already. | |
8bb8ab2e | 4727 | */ |
4a92b1b8 | 4728 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4729 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4730 | u64 orig_bytes, |
4731 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4732 | { |
f0486c68 | 4733 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4734 | u64 used; |
8bb8ab2e | 4735 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4736 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4737 | int ret = 0; |
fdb5effd | 4738 | bool flushing = false; |
9ed74f2d | 4739 | |
8bb8ab2e | 4740 | again: |
fdb5effd | 4741 | ret = 0; |
8bb8ab2e | 4742 | spin_lock(&space_info->lock); |
fdb5effd | 4743 | /* |
08e007d2 MX |
4744 | * We only want to wait if somebody other than us is flushing and we |
4745 | * are actually allowed to flush all things. | |
fdb5effd | 4746 | */ |
08e007d2 MX |
4747 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4748 | space_info->flush) { | |
fdb5effd JB |
4749 | spin_unlock(&space_info->lock); |
4750 | /* | |
4751 | * If we have a trans handle we can't wait because the flusher | |
4752 | * may have to commit the transaction, which would mean we would | |
4753 | * deadlock since we are waiting for the flusher to finish, but | |
4754 | * hold the current transaction open. | |
4755 | */ | |
663350ac | 4756 | if (current->journal_info) |
fdb5effd | 4757 | return -EAGAIN; |
b9688bb8 AJ |
4758 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4759 | /* Must have been killed, return */ | |
4760 | if (ret) | |
fdb5effd JB |
4761 | return -EINTR; |
4762 | ||
4763 | spin_lock(&space_info->lock); | |
4764 | } | |
4765 | ||
4766 | ret = -ENOSPC; | |
2bf64758 JB |
4767 | used = space_info->bytes_used + space_info->bytes_reserved + |
4768 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4769 | space_info->bytes_may_use; | |
9ed74f2d | 4770 | |
8bb8ab2e JB |
4771 | /* |
4772 | * The idea here is that we've not already over-reserved the block group | |
4773 | * then we can go ahead and save our reservation first and then start | |
4774 | * flushing if we need to. Otherwise if we've already overcommitted | |
4775 | * lets start flushing stuff first and then come back and try to make | |
4776 | * our reservation. | |
4777 | */ | |
2bf64758 JB |
4778 | if (used <= space_info->total_bytes) { |
4779 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4780 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4781 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4782 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4783 | ret = 0; |
4784 | } else { | |
4785 | /* | |
4786 | * Ok set num_bytes to orig_bytes since we aren't | |
4787 | * overocmmitted, this way we only try and reclaim what | |
4788 | * we need. | |
4789 | */ | |
4790 | num_bytes = orig_bytes; | |
4791 | } | |
4792 | } else { | |
4793 | /* | |
4794 | * Ok we're over committed, set num_bytes to the overcommitted | |
4795 | * amount plus the amount of bytes that we need for this | |
4796 | * reservation. | |
4797 | */ | |
2bf64758 | 4798 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4799 | (orig_bytes * 2); |
8bb8ab2e | 4800 | } |
9ed74f2d | 4801 | |
44734ed1 JB |
4802 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4803 | space_info->bytes_may_use += orig_bytes; | |
4804 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4805 | space_info->flags, orig_bytes, | |
4806 | 1); | |
4807 | ret = 0; | |
2bf64758 JB |
4808 | } |
4809 | ||
8bb8ab2e JB |
4810 | /* |
4811 | * Couldn't make our reservation, save our place so while we're trying | |
4812 | * to reclaim space we can actually use it instead of somebody else | |
4813 | * stealing it from us. | |
08e007d2 MX |
4814 | * |
4815 | * We make the other tasks wait for the flush only when we can flush | |
4816 | * all things. | |
8bb8ab2e | 4817 | */ |
72bcd99d | 4818 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4819 | flushing = true; |
4820 | space_info->flush = 1; | |
21c7e756 MX |
4821 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
4822 | used += orig_bytes; | |
f6acfd50 JB |
4823 | /* |
4824 | * We will do the space reservation dance during log replay, | |
4825 | * which means we won't have fs_info->fs_root set, so don't do | |
4826 | * the async reclaim as we will panic. | |
4827 | */ | |
4828 | if (!root->fs_info->log_root_recovering && | |
4829 | need_do_async_reclaim(space_info, root->fs_info, used) && | |
21c7e756 MX |
4830 | !work_busy(&root->fs_info->async_reclaim_work)) |
4831 | queue_work(system_unbound_wq, | |
4832 | &root->fs_info->async_reclaim_work); | |
8bb8ab2e | 4833 | } |
f0486c68 | 4834 | spin_unlock(&space_info->lock); |
9ed74f2d | 4835 | |
08e007d2 | 4836 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4837 | goto out; |
f0486c68 | 4838 | |
96c3f433 JB |
4839 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4840 | flush_state); | |
4841 | flush_state++; | |
08e007d2 MX |
4842 | |
4843 | /* | |
4844 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4845 | * would happen. So skip delalloc flush. | |
4846 | */ | |
4847 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4848 | (flush_state == FLUSH_DELALLOC || | |
4849 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4850 | flush_state = ALLOC_CHUNK; | |
4851 | ||
96c3f433 | 4852 | if (!ret) |
8bb8ab2e | 4853 | goto again; |
08e007d2 MX |
4854 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4855 | flush_state < COMMIT_TRANS) | |
4856 | goto again; | |
4857 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4858 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4859 | goto again; |
4860 | ||
4861 | out: | |
5d80366e JB |
4862 | if (ret == -ENOSPC && |
4863 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4864 | struct btrfs_block_rsv *global_rsv = | |
4865 | &root->fs_info->global_block_rsv; | |
4866 | ||
4867 | if (block_rsv != global_rsv && | |
4868 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4869 | ret = 0; | |
4870 | } | |
cab45e22 JM |
4871 | if (ret == -ENOSPC) |
4872 | trace_btrfs_space_reservation(root->fs_info, | |
4873 | "space_info:enospc", | |
4874 | space_info->flags, orig_bytes, 1); | |
fdb5effd | 4875 | if (flushing) { |
8bb8ab2e | 4876 | spin_lock(&space_info->lock); |
fdb5effd JB |
4877 | space_info->flush = 0; |
4878 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4879 | spin_unlock(&space_info->lock); |
f0486c68 | 4880 | } |
f0486c68 YZ |
4881 | return ret; |
4882 | } | |
4883 | ||
79787eaa JM |
4884 | static struct btrfs_block_rsv *get_block_rsv( |
4885 | const struct btrfs_trans_handle *trans, | |
4886 | const struct btrfs_root *root) | |
f0486c68 | 4887 | { |
4c13d758 JB |
4888 | struct btrfs_block_rsv *block_rsv = NULL; |
4889 | ||
e9cf439f AM |
4890 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
4891 | (root == root->fs_info->csum_root && trans->adding_csums) || | |
4892 | (root == root->fs_info->uuid_root)) | |
f7a81ea4 SB |
4893 | block_rsv = trans->block_rsv; |
4894 | ||
4c13d758 | 4895 | if (!block_rsv) |
f0486c68 YZ |
4896 | block_rsv = root->block_rsv; |
4897 | ||
4898 | if (!block_rsv) | |
4899 | block_rsv = &root->fs_info->empty_block_rsv; | |
4900 | ||
4901 | return block_rsv; | |
4902 | } | |
4903 | ||
4904 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4905 | u64 num_bytes) | |
4906 | { | |
4907 | int ret = -ENOSPC; | |
4908 | spin_lock(&block_rsv->lock); | |
4909 | if (block_rsv->reserved >= num_bytes) { | |
4910 | block_rsv->reserved -= num_bytes; | |
4911 | if (block_rsv->reserved < block_rsv->size) | |
4912 | block_rsv->full = 0; | |
4913 | ret = 0; | |
4914 | } | |
4915 | spin_unlock(&block_rsv->lock); | |
4916 | return ret; | |
4917 | } | |
4918 | ||
4919 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4920 | u64 num_bytes, int update_size) | |
4921 | { | |
4922 | spin_lock(&block_rsv->lock); | |
4923 | block_rsv->reserved += num_bytes; | |
4924 | if (update_size) | |
4925 | block_rsv->size += num_bytes; | |
4926 | else if (block_rsv->reserved >= block_rsv->size) | |
4927 | block_rsv->full = 1; | |
4928 | spin_unlock(&block_rsv->lock); | |
4929 | } | |
4930 | ||
d52be818 JB |
4931 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
4932 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4933 | int min_factor) | |
4934 | { | |
4935 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4936 | u64 min_bytes; | |
4937 | ||
4938 | if (global_rsv->space_info != dest->space_info) | |
4939 | return -ENOSPC; | |
4940 | ||
4941 | spin_lock(&global_rsv->lock); | |
4942 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4943 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4944 | spin_unlock(&global_rsv->lock); | |
4945 | return -ENOSPC; | |
4946 | } | |
4947 | global_rsv->reserved -= num_bytes; | |
4948 | if (global_rsv->reserved < global_rsv->size) | |
4949 | global_rsv->full = 0; | |
4950 | spin_unlock(&global_rsv->lock); | |
4951 | ||
4952 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4953 | return 0; | |
4954 | } | |
4955 | ||
8c2a3ca2 JB |
4956 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4957 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4958 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4959 | { |
4960 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4961 | ||
4962 | spin_lock(&block_rsv->lock); | |
4963 | if (num_bytes == (u64)-1) | |
4964 | num_bytes = block_rsv->size; | |
4965 | block_rsv->size -= num_bytes; | |
4966 | if (block_rsv->reserved >= block_rsv->size) { | |
4967 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4968 | block_rsv->reserved = block_rsv->size; | |
4969 | block_rsv->full = 1; | |
4970 | } else { | |
4971 | num_bytes = 0; | |
4972 | } | |
4973 | spin_unlock(&block_rsv->lock); | |
4974 | ||
4975 | if (num_bytes > 0) { | |
4976 | if (dest) { | |
e9e22899 JB |
4977 | spin_lock(&dest->lock); |
4978 | if (!dest->full) { | |
4979 | u64 bytes_to_add; | |
4980 | ||
4981 | bytes_to_add = dest->size - dest->reserved; | |
4982 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4983 | dest->reserved += bytes_to_add; | |
4984 | if (dest->reserved >= dest->size) | |
4985 | dest->full = 1; | |
4986 | num_bytes -= bytes_to_add; | |
4987 | } | |
4988 | spin_unlock(&dest->lock); | |
4989 | } | |
4990 | if (num_bytes) { | |
f0486c68 | 4991 | spin_lock(&space_info->lock); |
fb25e914 | 4992 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4993 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4994 | space_info->flags, num_bytes, 0); |
f0486c68 | 4995 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4996 | } |
9ed74f2d | 4997 | } |
f0486c68 | 4998 | } |
4e06bdd6 | 4999 | |
f0486c68 YZ |
5000 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
5001 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
5002 | { | |
5003 | int ret; | |
9ed74f2d | 5004 | |
f0486c68 YZ |
5005 | ret = block_rsv_use_bytes(src, num_bytes); |
5006 | if (ret) | |
5007 | return ret; | |
9ed74f2d | 5008 | |
f0486c68 | 5009 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
5010 | return 0; |
5011 | } | |
5012 | ||
66d8f3dd | 5013 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 5014 | { |
f0486c68 YZ |
5015 | memset(rsv, 0, sizeof(*rsv)); |
5016 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 5017 | rsv->type = type; |
f0486c68 YZ |
5018 | } |
5019 | ||
66d8f3dd MX |
5020 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
5021 | unsigned short type) | |
f0486c68 YZ |
5022 | { |
5023 | struct btrfs_block_rsv *block_rsv; | |
5024 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 5025 | |
f0486c68 YZ |
5026 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
5027 | if (!block_rsv) | |
5028 | return NULL; | |
9ed74f2d | 5029 | |
66d8f3dd | 5030 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
5031 | block_rsv->space_info = __find_space_info(fs_info, |
5032 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
5033 | return block_rsv; |
5034 | } | |
9ed74f2d | 5035 | |
f0486c68 YZ |
5036 | void btrfs_free_block_rsv(struct btrfs_root *root, |
5037 | struct btrfs_block_rsv *rsv) | |
5038 | { | |
2aaa6655 JB |
5039 | if (!rsv) |
5040 | return; | |
dabdb640 JB |
5041 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
5042 | kfree(rsv); | |
9ed74f2d JB |
5043 | } |
5044 | ||
cdfb080e CM |
5045 | void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv) |
5046 | { | |
5047 | kfree(rsv); | |
5048 | } | |
5049 | ||
08e007d2 MX |
5050 | int btrfs_block_rsv_add(struct btrfs_root *root, |
5051 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
5052 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 5053 | { |
f0486c68 | 5054 | int ret; |
9ed74f2d | 5055 | |
f0486c68 YZ |
5056 | if (num_bytes == 0) |
5057 | return 0; | |
8bb8ab2e | 5058 | |
61b520a9 | 5059 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
5060 | if (!ret) { |
5061 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
5062 | return 0; | |
5063 | } | |
9ed74f2d | 5064 | |
f0486c68 | 5065 | return ret; |
f0486c68 | 5066 | } |
9ed74f2d | 5067 | |
4a92b1b8 | 5068 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 5069 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
5070 | { |
5071 | u64 num_bytes = 0; | |
f0486c68 | 5072 | int ret = -ENOSPC; |
9ed74f2d | 5073 | |
f0486c68 YZ |
5074 | if (!block_rsv) |
5075 | return 0; | |
9ed74f2d | 5076 | |
f0486c68 | 5077 | spin_lock(&block_rsv->lock); |
36ba022a JB |
5078 | num_bytes = div_factor(block_rsv->size, min_factor); |
5079 | if (block_rsv->reserved >= num_bytes) | |
5080 | ret = 0; | |
5081 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 5082 | |
36ba022a JB |
5083 | return ret; |
5084 | } | |
5085 | ||
08e007d2 MX |
5086 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
5087 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
5088 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
5089 | { |
5090 | u64 num_bytes = 0; | |
5091 | int ret = -ENOSPC; | |
5092 | ||
5093 | if (!block_rsv) | |
5094 | return 0; | |
5095 | ||
5096 | spin_lock(&block_rsv->lock); | |
5097 | num_bytes = min_reserved; | |
13553e52 | 5098 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 5099 | ret = 0; |
13553e52 | 5100 | else |
f0486c68 | 5101 | num_bytes -= block_rsv->reserved; |
f0486c68 | 5102 | spin_unlock(&block_rsv->lock); |
13553e52 | 5103 | |
f0486c68 YZ |
5104 | if (!ret) |
5105 | return 0; | |
5106 | ||
aa38a711 | 5107 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
5108 | if (!ret) { |
5109 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 5110 | return 0; |
6a63209f | 5111 | } |
9ed74f2d | 5112 | |
13553e52 | 5113 | return ret; |
f0486c68 YZ |
5114 | } |
5115 | ||
5116 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
5117 | struct btrfs_block_rsv *dst_rsv, | |
5118 | u64 num_bytes) | |
5119 | { | |
5120 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
5121 | } | |
5122 | ||
5123 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
5124 | struct btrfs_block_rsv *block_rsv, | |
5125 | u64 num_bytes) | |
5126 | { | |
5127 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
17504584 | 5128 | if (global_rsv == block_rsv || |
f0486c68 YZ |
5129 | block_rsv->space_info != global_rsv->space_info) |
5130 | global_rsv = NULL; | |
8c2a3ca2 JB |
5131 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
5132 | num_bytes); | |
6a63209f JB |
5133 | } |
5134 | ||
5135 | /* | |
8929ecfa YZ |
5136 | * helper to calculate size of global block reservation. |
5137 | * the desired value is sum of space used by extent tree, | |
5138 | * checksum tree and root tree | |
6a63209f | 5139 | */ |
8929ecfa | 5140 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 5141 | { |
8929ecfa YZ |
5142 | struct btrfs_space_info *sinfo; |
5143 | u64 num_bytes; | |
5144 | u64 meta_used; | |
5145 | u64 data_used; | |
6c41761f | 5146 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 5147 | |
8929ecfa YZ |
5148 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
5149 | spin_lock(&sinfo->lock); | |
5150 | data_used = sinfo->bytes_used; | |
5151 | spin_unlock(&sinfo->lock); | |
33b4d47f | 5152 | |
8929ecfa YZ |
5153 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
5154 | spin_lock(&sinfo->lock); | |
6d48755d JB |
5155 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
5156 | data_used = 0; | |
8929ecfa YZ |
5157 | meta_used = sinfo->bytes_used; |
5158 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 5159 | |
8929ecfa YZ |
5160 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
5161 | csum_size * 2; | |
f8c269d7 | 5162 | num_bytes += div_u64(data_used + meta_used, 50); |
4e06bdd6 | 5163 | |
8929ecfa | 5164 | if (num_bytes * 3 > meta_used) |
f8c269d7 | 5165 | num_bytes = div_u64(meta_used, 3); |
ab6e2410 | 5166 | |
707e8a07 | 5167 | return ALIGN(num_bytes, fs_info->extent_root->nodesize << 10); |
8929ecfa | 5168 | } |
6a63209f | 5169 | |
8929ecfa YZ |
5170 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
5171 | { | |
5172 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
5173 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
5174 | u64 num_bytes; | |
6a63209f | 5175 | |
8929ecfa | 5176 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 5177 | |
8929ecfa | 5178 | spin_lock(&sinfo->lock); |
1f699d38 | 5179 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 5180 | |
fdf30d1c | 5181 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 5182 | |
8929ecfa | 5183 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
5184 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
5185 | sinfo->bytes_may_use; | |
8929ecfa YZ |
5186 | |
5187 | if (sinfo->total_bytes > num_bytes) { | |
5188 | num_bytes = sinfo->total_bytes - num_bytes; | |
5189 | block_rsv->reserved += num_bytes; | |
fb25e914 | 5190 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 5191 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 5192 | sinfo->flags, num_bytes, 1); |
6a63209f | 5193 | } |
6a63209f | 5194 | |
8929ecfa YZ |
5195 | if (block_rsv->reserved >= block_rsv->size) { |
5196 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 5197 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 5198 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 5199 | sinfo->flags, num_bytes, 0); |
8929ecfa YZ |
5200 | block_rsv->reserved = block_rsv->size; |
5201 | block_rsv->full = 1; | |
5202 | } | |
182608c8 | 5203 | |
8929ecfa | 5204 | spin_unlock(&block_rsv->lock); |
1f699d38 | 5205 | spin_unlock(&sinfo->lock); |
6a63209f JB |
5206 | } |
5207 | ||
f0486c68 | 5208 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5209 | { |
f0486c68 | 5210 | struct btrfs_space_info *space_info; |
6a63209f | 5211 | |
f0486c68 YZ |
5212 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
5213 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 5214 | |
f0486c68 | 5215 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 5216 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 5217 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
5218 | fs_info->trans_block_rsv.space_info = space_info; |
5219 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 5220 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 5221 | |
8929ecfa YZ |
5222 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
5223 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
5224 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
5225 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
5226 | if (fs_info->quota_root) |
5227 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 5228 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 5229 | |
8929ecfa | 5230 | update_global_block_rsv(fs_info); |
6a63209f JB |
5231 | } |
5232 | ||
8929ecfa | 5233 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5234 | { |
8c2a3ca2 JB |
5235 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
5236 | (u64)-1); | |
8929ecfa YZ |
5237 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
5238 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
5239 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
5240 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
5241 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
5242 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
5243 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
5244 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
5245 | } |
5246 | ||
a22285a6 YZ |
5247 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
5248 | struct btrfs_root *root) | |
6a63209f | 5249 | { |
0e721106 JB |
5250 | if (!trans->block_rsv) |
5251 | return; | |
5252 | ||
a22285a6 YZ |
5253 | if (!trans->bytes_reserved) |
5254 | return; | |
6a63209f | 5255 | |
e77266e4 | 5256 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 5257 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 5258 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
5259 | trans->bytes_reserved = 0; |
5260 | } | |
6a63209f | 5261 | |
4fbcdf66 FM |
5262 | /* |
5263 | * To be called after all the new block groups attached to the transaction | |
5264 | * handle have been created (btrfs_create_pending_block_groups()). | |
5265 | */ | |
5266 | void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans) | |
5267 | { | |
5268 | struct btrfs_fs_info *fs_info = trans->root->fs_info; | |
5269 | ||
5270 | if (!trans->chunk_bytes_reserved) | |
5271 | return; | |
5272 | ||
5273 | WARN_ON_ONCE(!list_empty(&trans->new_bgs)); | |
5274 | ||
5275 | block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL, | |
5276 | trans->chunk_bytes_reserved); | |
5277 | trans->chunk_bytes_reserved = 0; | |
5278 | } | |
5279 | ||
79787eaa | 5280 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
5281 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
5282 | struct inode *inode) | |
5283 | { | |
5284 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5285 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
5286 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
5287 | ||
5288 | /* | |
fcb80c2a JB |
5289 | * We need to hold space in order to delete our orphan item once we've |
5290 | * added it, so this takes the reservation so we can release it later | |
5291 | * when we are truly done with the orphan item. | |
d68fc57b | 5292 | */ |
ff5714cc | 5293 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
5294 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
5295 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 5296 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
5297 | } |
5298 | ||
d68fc57b | 5299 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 5300 | { |
d68fc57b | 5301 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 5302 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
5303 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
5304 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
5305 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
5306 | } | |
97e728d4 | 5307 | |
d5c12070 MX |
5308 | /* |
5309 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
5310 | * root: the root of the parent directory | |
5311 | * rsv: block reservation | |
5312 | * items: the number of items that we need do reservation | |
5313 | * qgroup_reserved: used to return the reserved size in qgroup | |
5314 | * | |
5315 | * This function is used to reserve the space for snapshot/subvolume | |
5316 | * creation and deletion. Those operations are different with the | |
5317 | * common file/directory operations, they change two fs/file trees | |
5318 | * and root tree, the number of items that the qgroup reserves is | |
5319 | * different with the free space reservation. So we can not use | |
5320 | * the space reseravtion mechanism in start_transaction(). | |
5321 | */ | |
5322 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
5323 | struct btrfs_block_rsv *rsv, | |
5324 | int items, | |
ee3441b4 JM |
5325 | u64 *qgroup_reserved, |
5326 | bool use_global_rsv) | |
a22285a6 | 5327 | { |
d5c12070 MX |
5328 | u64 num_bytes; |
5329 | int ret; | |
ee3441b4 | 5330 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
d5c12070 MX |
5331 | |
5332 | if (root->fs_info->quota_enabled) { | |
5333 | /* One for parent inode, two for dir entries */ | |
707e8a07 | 5334 | num_bytes = 3 * root->nodesize; |
d5c12070 MX |
5335 | ret = btrfs_qgroup_reserve(root, num_bytes); |
5336 | if (ret) | |
5337 | return ret; | |
5338 | } else { | |
5339 | num_bytes = 0; | |
5340 | } | |
5341 | ||
5342 | *qgroup_reserved = num_bytes; | |
5343 | ||
5344 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
5345 | rsv->space_info = __find_space_info(root->fs_info, | |
5346 | BTRFS_BLOCK_GROUP_METADATA); | |
5347 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
5348 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
5349 | |
5350 | if (ret == -ENOSPC && use_global_rsv) | |
5351 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); | |
5352 | ||
d5c12070 MX |
5353 | if (ret) { |
5354 | if (*qgroup_reserved) | |
5355 | btrfs_qgroup_free(root, *qgroup_reserved); | |
5356 | } | |
5357 | ||
5358 | return ret; | |
5359 | } | |
5360 | ||
5361 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
5362 | struct btrfs_block_rsv *rsv, | |
5363 | u64 qgroup_reserved) | |
5364 | { | |
5365 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
97e728d4 JB |
5366 | } |
5367 | ||
7709cde3 JB |
5368 | /** |
5369 | * drop_outstanding_extent - drop an outstanding extent | |
5370 | * @inode: the inode we're dropping the extent for | |
dcab6a3b | 5371 | * @num_bytes: the number of bytes we're relaseing. |
7709cde3 JB |
5372 | * |
5373 | * This is called when we are freeing up an outstanding extent, either called | |
5374 | * after an error or after an extent is written. This will return the number of | |
5375 | * reserved extents that need to be freed. This must be called with | |
5376 | * BTRFS_I(inode)->lock held. | |
5377 | */ | |
dcab6a3b | 5378 | static unsigned drop_outstanding_extent(struct inode *inode, u64 num_bytes) |
9e0baf60 | 5379 | { |
7fd2ae21 | 5380 | unsigned drop_inode_space = 0; |
9e0baf60 | 5381 | unsigned dropped_extents = 0; |
dcab6a3b | 5382 | unsigned num_extents = 0; |
9e0baf60 | 5383 | |
dcab6a3b JB |
5384 | num_extents = (unsigned)div64_u64(num_bytes + |
5385 | BTRFS_MAX_EXTENT_SIZE - 1, | |
5386 | BTRFS_MAX_EXTENT_SIZE); | |
5387 | ASSERT(num_extents); | |
5388 | ASSERT(BTRFS_I(inode)->outstanding_extents >= num_extents); | |
5389 | BTRFS_I(inode)->outstanding_extents -= num_extents; | |
9e0baf60 | 5390 | |
7fd2ae21 | 5391 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
5392 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
5393 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 5394 | drop_inode_space = 1; |
7fd2ae21 | 5395 | |
9e0baf60 JB |
5396 | /* |
5397 | * If we have more or the same amount of outsanding extents than we have | |
5398 | * reserved then we need to leave the reserved extents count alone. | |
5399 | */ | |
5400 | if (BTRFS_I(inode)->outstanding_extents >= | |
5401 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 5402 | return drop_inode_space; |
9e0baf60 JB |
5403 | |
5404 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
5405 | BTRFS_I(inode)->outstanding_extents; | |
5406 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 5407 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
5408 | } |
5409 | ||
7709cde3 JB |
5410 | /** |
5411 | * calc_csum_metadata_size - return the amount of metada space that must be | |
5412 | * reserved/free'd for the given bytes. | |
5413 | * @inode: the inode we're manipulating | |
5414 | * @num_bytes: the number of bytes in question | |
5415 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
5416 | * | |
5417 | * This adjusts the number of csum_bytes in the inode and then returns the | |
5418 | * correct amount of metadata that must either be reserved or freed. We | |
5419 | * calculate how many checksums we can fit into one leaf and then divide the | |
5420 | * number of bytes that will need to be checksumed by this value to figure out | |
5421 | * how many checksums will be required. If we are adding bytes then the number | |
5422 | * may go up and we will return the number of additional bytes that must be | |
5423 | * reserved. If it is going down we will return the number of bytes that must | |
5424 | * be freed. | |
5425 | * | |
5426 | * This must be called with BTRFS_I(inode)->lock held. | |
5427 | */ | |
5428 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
5429 | int reserve) | |
6324fbf3 | 5430 | { |
7709cde3 | 5431 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1262133b | 5432 | u64 old_csums, num_csums; |
7709cde3 JB |
5433 | |
5434 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
5435 | BTRFS_I(inode)->csum_bytes == 0) | |
5436 | return 0; | |
5437 | ||
28f75a0e | 5438 | old_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); |
7709cde3 JB |
5439 | if (reserve) |
5440 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
5441 | else | |
5442 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
28f75a0e | 5443 | num_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); |
7709cde3 JB |
5444 | |
5445 | /* No change, no need to reserve more */ | |
5446 | if (old_csums == num_csums) | |
5447 | return 0; | |
5448 | ||
5449 | if (reserve) | |
5450 | return btrfs_calc_trans_metadata_size(root, | |
5451 | num_csums - old_csums); | |
5452 | ||
5453 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 5454 | } |
c146afad | 5455 | |
0ca1f7ce YZ |
5456 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
5457 | { | |
5458 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5459 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 5460 | u64 to_reserve = 0; |
660d3f6c | 5461 | u64 csum_bytes; |
9e0baf60 | 5462 | unsigned nr_extents = 0; |
660d3f6c | 5463 | int extra_reserve = 0; |
08e007d2 | 5464 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 5465 | int ret = 0; |
c64c2bd8 | 5466 | bool delalloc_lock = true; |
88e081bf WS |
5467 | u64 to_free = 0; |
5468 | unsigned dropped; | |
6324fbf3 | 5469 | |
c64c2bd8 JB |
5470 | /* If we are a free space inode we need to not flush since we will be in |
5471 | * the middle of a transaction commit. We also don't need the delalloc | |
5472 | * mutex since we won't race with anybody. We need this mostly to make | |
5473 | * lockdep shut its filthy mouth. | |
5474 | */ | |
5475 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 5476 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
5477 | delalloc_lock = false; |
5478 | } | |
c09544e0 | 5479 | |
08e007d2 MX |
5480 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
5481 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 5482 | schedule_timeout(1); |
ec44a35c | 5483 | |
c64c2bd8 JB |
5484 | if (delalloc_lock) |
5485 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
5486 | ||
0ca1f7ce | 5487 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 5488 | |
9e0baf60 | 5489 | spin_lock(&BTRFS_I(inode)->lock); |
6a41dd09 JB |
5490 | nr_extents = (unsigned)div64_u64(num_bytes + |
5491 | BTRFS_MAX_EXTENT_SIZE - 1, | |
5492 | BTRFS_MAX_EXTENT_SIZE); | |
5493 | BTRFS_I(inode)->outstanding_extents += nr_extents; | |
5494 | nr_extents = 0; | |
9e0baf60 JB |
5495 | |
5496 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 5497 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
5498 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
5499 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 5500 | |
7fd2ae21 JB |
5501 | /* |
5502 | * Add an item to reserve for updating the inode when we complete the | |
5503 | * delalloc io. | |
5504 | */ | |
72ac3c0d JB |
5505 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
5506 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 5507 | nr_extents++; |
660d3f6c | 5508 | extra_reserve = 1; |
593060d7 | 5509 | } |
7fd2ae21 JB |
5510 | |
5511 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 5512 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 5513 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 5514 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 5515 | |
88e081bf | 5516 | if (root->fs_info->quota_enabled) { |
237c0e9f | 5517 | ret = btrfs_qgroup_reserve(root, nr_extents * root->nodesize); |
88e081bf WS |
5518 | if (ret) |
5519 | goto out_fail; | |
5520 | } | |
c5567237 | 5521 | |
88e081bf WS |
5522 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
5523 | if (unlikely(ret)) { | |
5524 | if (root->fs_info->quota_enabled) | |
237c0e9f | 5525 | btrfs_qgroup_free(root, nr_extents * root->nodesize); |
88e081bf | 5526 | goto out_fail; |
9e0baf60 | 5527 | } |
25179201 | 5528 | |
660d3f6c JB |
5529 | spin_lock(&BTRFS_I(inode)->lock); |
5530 | if (extra_reserve) { | |
72ac3c0d JB |
5531 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
5532 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
5533 | nr_extents--; |
5534 | } | |
5535 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
5536 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
5537 | |
5538 | if (delalloc_lock) | |
5539 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 5540 | |
8c2a3ca2 | 5541 | if (to_reserve) |
67871254 | 5542 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
8c2a3ca2 | 5543 | btrfs_ino(inode), to_reserve, 1); |
0ca1f7ce YZ |
5544 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
5545 | ||
0ca1f7ce | 5546 | return 0; |
88e081bf WS |
5547 | |
5548 | out_fail: | |
5549 | spin_lock(&BTRFS_I(inode)->lock); | |
dcab6a3b | 5550 | dropped = drop_outstanding_extent(inode, num_bytes); |
88e081bf WS |
5551 | /* |
5552 | * If the inodes csum_bytes is the same as the original | |
5553 | * csum_bytes then we know we haven't raced with any free()ers | |
5554 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 5555 | */ |
f4881bc7 | 5556 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 5557 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
5558 | } else { |
5559 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5560 | u64 bytes; | |
5561 | ||
5562 | /* | |
5563 | * This is tricky, but first we need to figure out how much we | |
5564 | * free'd from any free-ers that occured during this | |
5565 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
5566 | * before we dropped our lock, and then call the free for the | |
5567 | * number of bytes that were freed while we were trying our | |
5568 | * reservation. | |
5569 | */ | |
5570 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
5571 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
5572 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
5573 | ||
5574 | ||
5575 | /* | |
5576 | * Now we need to see how much we would have freed had we not | |
5577 | * been making this reservation and our ->csum_bytes were not | |
5578 | * artificially inflated. | |
5579 | */ | |
5580 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
5581 | bytes = csum_bytes - orig_csum_bytes; | |
5582 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
5583 | ||
5584 | /* | |
5585 | * Now reset ->csum_bytes to what it should be. If bytes is | |
5586 | * more than to_free then we would have free'd more space had we | |
5587 | * not had an artificially high ->csum_bytes, so we need to free | |
5588 | * the remainder. If bytes is the same or less then we don't | |
5589 | * need to do anything, the other free-ers did the correct | |
5590 | * thing. | |
5591 | */ | |
5592 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5593 | if (bytes > to_free) | |
5594 | to_free = bytes - to_free; | |
5595 | else | |
5596 | to_free = 0; | |
5597 | } | |
88e081bf | 5598 | spin_unlock(&BTRFS_I(inode)->lock); |
e2d1f923 | 5599 | if (dropped) |
88e081bf WS |
5600 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
5601 | ||
5602 | if (to_free) { | |
5603 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5604 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5605 | btrfs_ino(inode), to_free, 0); | |
5606 | } | |
5607 | if (delalloc_lock) | |
5608 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5609 | return ret; | |
0ca1f7ce YZ |
5610 | } |
5611 | ||
7709cde3 JB |
5612 | /** |
5613 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5614 | * @inode: the inode to release the reservation for | |
5615 | * @num_bytes: the number of bytes we're releasing | |
5616 | * | |
5617 | * This will release the metadata reservation for an inode. This can be called | |
5618 | * once we complete IO for a given set of bytes to release their metadata | |
5619 | * reservations. | |
5620 | */ | |
0ca1f7ce YZ |
5621 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
5622 | { | |
5623 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
5624 | u64 to_free = 0; |
5625 | unsigned dropped; | |
0ca1f7ce YZ |
5626 | |
5627 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 5628 | spin_lock(&BTRFS_I(inode)->lock); |
dcab6a3b | 5629 | dropped = drop_outstanding_extent(inode, num_bytes); |
97e728d4 | 5630 | |
0934856d MX |
5631 | if (num_bytes) |
5632 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 5633 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5634 | if (dropped > 0) |
5635 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5636 | |
6a3891c5 JB |
5637 | if (btrfs_test_is_dummy_root(root)) |
5638 | return; | |
5639 | ||
8c2a3ca2 JB |
5640 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5641 | btrfs_ino(inode), to_free, 0); | |
c5567237 | 5642 | |
0ca1f7ce YZ |
5643 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5644 | to_free); | |
5645 | } | |
5646 | ||
7709cde3 JB |
5647 | /** |
5648 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5649 | * @inode: inode we're writing to | |
5650 | * @num_bytes: the number of bytes we want to allocate | |
5651 | * | |
5652 | * This will do the following things | |
5653 | * | |
5654 | * o reserve space in the data space info for num_bytes | |
5655 | * o reserve space in the metadata space info based on number of outstanding | |
5656 | * extents and how much csums will be needed | |
5657 | * o add to the inodes ->delalloc_bytes | |
5658 | * o add it to the fs_info's delalloc inodes list. | |
5659 | * | |
5660 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5661 | */ | |
0ca1f7ce YZ |
5662 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5663 | { | |
5664 | int ret; | |
5665 | ||
e2d1f923 | 5666 | ret = btrfs_check_data_free_space(inode, num_bytes, num_bytes); |
d397712b | 5667 | if (ret) |
0ca1f7ce YZ |
5668 | return ret; |
5669 | ||
5670 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5671 | if (ret) { | |
5672 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5673 | return ret; | |
5674 | } | |
5675 | ||
5676 | return 0; | |
5677 | } | |
5678 | ||
7709cde3 JB |
5679 | /** |
5680 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5681 | * @inode: inode we're releasing space for | |
5682 | * @num_bytes: the number of bytes we want to free up | |
5683 | * | |
5684 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5685 | * called in the case that we don't need the metadata AND data reservations | |
5686 | * anymore. So if there is an error or we insert an inline extent. | |
5687 | * | |
5688 | * This function will release the metadata space that was not used and will | |
5689 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5690 | * list if there are no delalloc bytes left. | |
5691 | */ | |
0ca1f7ce YZ |
5692 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5693 | { | |
5694 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5695 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5696 | } |
5697 | ||
ce93ec54 JB |
5698 | static int update_block_group(struct btrfs_trans_handle *trans, |
5699 | struct btrfs_root *root, u64 bytenr, | |
5700 | u64 num_bytes, int alloc) | |
9078a3e1 | 5701 | { |
0af3d00b | 5702 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5703 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5704 | u64 total = num_bytes; |
9078a3e1 | 5705 | u64 old_val; |
db94535d | 5706 | u64 byte_in_group; |
0af3d00b | 5707 | int factor; |
3e1ad54f | 5708 | |
5d4f98a2 | 5709 | /* block accounting for super block */ |
eb73c1b7 | 5710 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 5711 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5712 | if (alloc) |
5713 | old_val += num_bytes; | |
5714 | else | |
5715 | old_val -= num_bytes; | |
6c41761f | 5716 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 5717 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 5718 | |
d397712b | 5719 | while (total) { |
db94535d | 5720 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5721 | if (!cache) |
79787eaa | 5722 | return -ENOENT; |
b742bb82 YZ |
5723 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5724 | BTRFS_BLOCK_GROUP_RAID1 | | |
5725 | BTRFS_BLOCK_GROUP_RAID10)) | |
5726 | factor = 2; | |
5727 | else | |
5728 | factor = 1; | |
9d66e233 JB |
5729 | /* |
5730 | * If this block group has free space cache written out, we | |
5731 | * need to make sure to load it if we are removing space. This | |
5732 | * is because we need the unpinning stage to actually add the | |
5733 | * space back to the block group, otherwise we will leak space. | |
5734 | */ | |
5735 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5736 | cache_block_group(cache, 1); |
0af3d00b | 5737 | |
db94535d CM |
5738 | byte_in_group = bytenr - cache->key.objectid; |
5739 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5740 | |
25179201 | 5741 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5742 | spin_lock(&cache->lock); |
0af3d00b | 5743 | |
73bc1876 | 5744 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5745 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5746 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5747 | ||
9078a3e1 | 5748 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5749 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5750 | if (alloc) { |
db94535d | 5751 | old_val += num_bytes; |
11833d66 YZ |
5752 | btrfs_set_block_group_used(&cache->item, old_val); |
5753 | cache->reserved -= num_bytes; | |
11833d66 | 5754 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5755 | cache->space_info->bytes_used += num_bytes; |
5756 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5757 | spin_unlock(&cache->lock); |
25179201 | 5758 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5759 | } else { |
db94535d | 5760 | old_val -= num_bytes; |
ae0ab003 FM |
5761 | btrfs_set_block_group_used(&cache->item, old_val); |
5762 | cache->pinned += num_bytes; | |
5763 | cache->space_info->bytes_pinned += num_bytes; | |
5764 | cache->space_info->bytes_used -= num_bytes; | |
5765 | cache->space_info->disk_used -= num_bytes * factor; | |
5766 | spin_unlock(&cache->lock); | |
5767 | spin_unlock(&cache->space_info->lock); | |
47ab2a6c | 5768 | |
ae0ab003 FM |
5769 | set_extent_dirty(info->pinned_extents, |
5770 | bytenr, bytenr + num_bytes - 1, | |
5771 | GFP_NOFS | __GFP_NOFAIL); | |
47ab2a6c JB |
5772 | /* |
5773 | * No longer have used bytes in this block group, queue | |
5774 | * it for deletion. | |
5775 | */ | |
5776 | if (old_val == 0) { | |
5777 | spin_lock(&info->unused_bgs_lock); | |
5778 | if (list_empty(&cache->bg_list)) { | |
5779 | btrfs_get_block_group(cache); | |
5780 | list_add_tail(&cache->bg_list, | |
5781 | &info->unused_bgs); | |
5782 | } | |
5783 | spin_unlock(&info->unused_bgs_lock); | |
5784 | } | |
cd1bc465 | 5785 | } |
1bbc621e CM |
5786 | |
5787 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
5788 | if (list_empty(&cache->dirty_list)) { | |
5789 | list_add_tail(&cache->dirty_list, | |
5790 | &trans->transaction->dirty_bgs); | |
5791 | trans->transaction->num_dirty_bgs++; | |
5792 | btrfs_get_block_group(cache); | |
5793 | } | |
5794 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
5795 | ||
fa9c0d79 | 5796 | btrfs_put_block_group(cache); |
db94535d CM |
5797 | total -= num_bytes; |
5798 | bytenr += num_bytes; | |
9078a3e1 CM |
5799 | } |
5800 | return 0; | |
5801 | } | |
6324fbf3 | 5802 | |
a061fc8d CM |
5803 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5804 | { | |
0f9dd46c | 5805 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5806 | u64 bytenr; |
0f9dd46c | 5807 | |
a1897fdd LB |
5808 | spin_lock(&root->fs_info->block_group_cache_lock); |
5809 | bytenr = root->fs_info->first_logical_byte; | |
5810 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5811 | ||
5812 | if (bytenr < (u64)-1) | |
5813 | return bytenr; | |
5814 | ||
0f9dd46c JB |
5815 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5816 | if (!cache) | |
a061fc8d | 5817 | return 0; |
0f9dd46c | 5818 | |
d2fb3437 | 5819 | bytenr = cache->key.objectid; |
fa9c0d79 | 5820 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5821 | |
5822 | return bytenr; | |
a061fc8d CM |
5823 | } |
5824 | ||
f0486c68 YZ |
5825 | static int pin_down_extent(struct btrfs_root *root, |
5826 | struct btrfs_block_group_cache *cache, | |
5827 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5828 | { |
11833d66 YZ |
5829 | spin_lock(&cache->space_info->lock); |
5830 | spin_lock(&cache->lock); | |
5831 | cache->pinned += num_bytes; | |
5832 | cache->space_info->bytes_pinned += num_bytes; | |
5833 | if (reserved) { | |
5834 | cache->reserved -= num_bytes; | |
5835 | cache->space_info->bytes_reserved -= num_bytes; | |
5836 | } | |
5837 | spin_unlock(&cache->lock); | |
5838 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5839 | |
f0486c68 YZ |
5840 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5841 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
e2d1f923 | 5842 | if (reserved) |
0be5dc67 | 5843 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); |
f0486c68 YZ |
5844 | return 0; |
5845 | } | |
68b38550 | 5846 | |
f0486c68 YZ |
5847 | /* |
5848 | * this function must be called within transaction | |
5849 | */ | |
5850 | int btrfs_pin_extent(struct btrfs_root *root, | |
5851 | u64 bytenr, u64 num_bytes, int reserved) | |
5852 | { | |
5853 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5854 | |
f0486c68 | 5855 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5856 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5857 | |
5858 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5859 | ||
5860 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5861 | return 0; |
5862 | } | |
5863 | ||
f0486c68 | 5864 | /* |
e688b725 CM |
5865 | * this function must be called within transaction |
5866 | */ | |
dcfac415 | 5867 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5868 | u64 bytenr, u64 num_bytes) |
5869 | { | |
5870 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5871 | int ret; |
e688b725 CM |
5872 | |
5873 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5874 | if (!cache) |
5875 | return -EINVAL; | |
e688b725 CM |
5876 | |
5877 | /* | |
5878 | * pull in the free space cache (if any) so that our pin | |
5879 | * removes the free space from the cache. We have load_only set | |
5880 | * to one because the slow code to read in the free extents does check | |
5881 | * the pinned extents. | |
5882 | */ | |
f6373bf3 | 5883 | cache_block_group(cache, 1); |
e688b725 CM |
5884 | |
5885 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5886 | ||
5887 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5888 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5889 | btrfs_put_block_group(cache); |
b50c6e25 | 5890 | return ret; |
e688b725 CM |
5891 | } |
5892 | ||
8c2a1a30 JB |
5893 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
5894 | { | |
5895 | int ret; | |
5896 | struct btrfs_block_group_cache *block_group; | |
5897 | struct btrfs_caching_control *caching_ctl; | |
5898 | ||
5899 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5900 | if (!block_group) | |
5901 | return -EINVAL; | |
5902 | ||
5903 | cache_block_group(block_group, 0); | |
5904 | caching_ctl = get_caching_control(block_group); | |
5905 | ||
5906 | if (!caching_ctl) { | |
5907 | /* Logic error */ | |
5908 | BUG_ON(!block_group_cache_done(block_group)); | |
5909 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5910 | } else { | |
5911 | mutex_lock(&caching_ctl->mutex); | |
5912 | ||
5913 | if (start >= caching_ctl->progress) { | |
5914 | ret = add_excluded_extent(root, start, num_bytes); | |
5915 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5916 | ret = btrfs_remove_free_space(block_group, | |
5917 | start, num_bytes); | |
5918 | } else { | |
5919 | num_bytes = caching_ctl->progress - start; | |
5920 | ret = btrfs_remove_free_space(block_group, | |
5921 | start, num_bytes); | |
5922 | if (ret) | |
5923 | goto out_lock; | |
5924 | ||
5925 | num_bytes = (start + num_bytes) - | |
5926 | caching_ctl->progress; | |
5927 | start = caching_ctl->progress; | |
5928 | ret = add_excluded_extent(root, start, num_bytes); | |
5929 | } | |
5930 | out_lock: | |
5931 | mutex_unlock(&caching_ctl->mutex); | |
5932 | put_caching_control(caching_ctl); | |
5933 | } | |
5934 | btrfs_put_block_group(block_group); | |
5935 | return ret; | |
5936 | } | |
5937 | ||
5938 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5939 | struct extent_buffer *eb) | |
5940 | { | |
5941 | struct btrfs_file_extent_item *item; | |
5942 | struct btrfs_key key; | |
5943 | int found_type; | |
5944 | int i; | |
5945 | ||
5946 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5947 | return 0; | |
5948 | ||
5949 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5950 | btrfs_item_key_to_cpu(eb, &key, i); | |
5951 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5952 | continue; | |
5953 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5954 | found_type = btrfs_file_extent_type(eb, item); | |
5955 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5956 | continue; | |
5957 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5958 | continue; | |
5959 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5960 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5961 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5962 | } | |
5963 | ||
5964 | return 0; | |
5965 | } | |
5966 | ||
fb25e914 JB |
5967 | /** |
5968 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5969 | * @cache: The cache we are manipulating | |
5970 | * @num_bytes: The number of bytes in question | |
5971 | * @reserve: One of the reservation enums | |
e570fd27 | 5972 | * @delalloc: The blocks are allocated for the delalloc write |
fb25e914 JB |
5973 | * |
5974 | * This is called by the allocator when it reserves space, or by somebody who is | |
5975 | * freeing space that was never actually used on disk. For example if you | |
5976 | * reserve some space for a new leaf in transaction A and before transaction A | |
5977 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5978 | * clear the reservation. | |
5979 | * | |
5980 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5981 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5982 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5983 | * allocating less disk space for the amount of data we have reserved in the | |
5984 | * case of compression. | |
5985 | * | |
5986 | * If this is a reservation and the block group has become read only we cannot | |
5987 | * make the reservation and return -EAGAIN, otherwise this function always | |
5988 | * succeeds. | |
f0486c68 | 5989 | */ |
fb25e914 | 5990 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
e570fd27 | 5991 | u64 num_bytes, int reserve, int delalloc) |
11833d66 | 5992 | { |
fb25e914 | 5993 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5994 | int ret = 0; |
79787eaa | 5995 | |
fb25e914 JB |
5996 | spin_lock(&space_info->lock); |
5997 | spin_lock(&cache->lock); | |
5998 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5999 | if (cache->ro) { |
6000 | ret = -EAGAIN; | |
6001 | } else { | |
fb25e914 JB |
6002 | cache->reserved += num_bytes; |
6003 | space_info->bytes_reserved += num_bytes; | |
6004 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 6005 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
6006 | "space_info", space_info->flags, |
6007 | num_bytes, 0); | |
fb25e914 JB |
6008 | space_info->bytes_may_use -= num_bytes; |
6009 | } | |
e570fd27 MX |
6010 | |
6011 | if (delalloc) | |
6012 | cache->delalloc_bytes += num_bytes; | |
f0486c68 | 6013 | } |
fb25e914 JB |
6014 | } else { |
6015 | if (cache->ro) | |
6016 | space_info->bytes_readonly += num_bytes; | |
6017 | cache->reserved -= num_bytes; | |
6018 | space_info->bytes_reserved -= num_bytes; | |
e570fd27 MX |
6019 | |
6020 | if (delalloc) | |
6021 | cache->delalloc_bytes -= num_bytes; | |
324ae4df | 6022 | } |
fb25e914 JB |
6023 | spin_unlock(&cache->lock); |
6024 | spin_unlock(&space_info->lock); | |
f0486c68 | 6025 | return ret; |
324ae4df | 6026 | } |
9078a3e1 | 6027 | |
143bede5 | 6028 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 6029 | struct btrfs_root *root) |
e8569813 | 6030 | { |
e8569813 | 6031 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
6032 | struct btrfs_caching_control *next; |
6033 | struct btrfs_caching_control *caching_ctl; | |
6034 | struct btrfs_block_group_cache *cache; | |
e8569813 | 6035 | |
9e351cc8 | 6036 | down_write(&fs_info->commit_root_sem); |
25179201 | 6037 | |
11833d66 YZ |
6038 | list_for_each_entry_safe(caching_ctl, next, |
6039 | &fs_info->caching_block_groups, list) { | |
6040 | cache = caching_ctl->block_group; | |
6041 | if (block_group_cache_done(cache)) { | |
6042 | cache->last_byte_to_unpin = (u64)-1; | |
6043 | list_del_init(&caching_ctl->list); | |
6044 | put_caching_control(caching_ctl); | |
e8569813 | 6045 | } else { |
11833d66 | 6046 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 6047 | } |
e8569813 | 6048 | } |
11833d66 YZ |
6049 | |
6050 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
6051 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
6052 | else | |
6053 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
6054 | ||
9e351cc8 | 6055 | up_write(&fs_info->commit_root_sem); |
8929ecfa YZ |
6056 | |
6057 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
6058 | } |
6059 | ||
678886bd FM |
6060 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end, |
6061 | const bool return_free_space) | |
ccd467d6 | 6062 | { |
11833d66 YZ |
6063 | struct btrfs_fs_info *fs_info = root->fs_info; |
6064 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
6065 | struct btrfs_space_info *space_info; |
6066 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 6067 | u64 len; |
7b398f8e | 6068 | bool readonly; |
ccd467d6 | 6069 | |
11833d66 | 6070 | while (start <= end) { |
7b398f8e | 6071 | readonly = false; |
11833d66 YZ |
6072 | if (!cache || |
6073 | start >= cache->key.objectid + cache->key.offset) { | |
6074 | if (cache) | |
6075 | btrfs_put_block_group(cache); | |
6076 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 6077 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
6078 | } |
6079 | ||
6080 | len = cache->key.objectid + cache->key.offset - start; | |
6081 | len = min(len, end + 1 - start); | |
6082 | ||
6083 | if (start < cache->last_byte_to_unpin) { | |
6084 | len = min(len, cache->last_byte_to_unpin - start); | |
678886bd FM |
6085 | if (return_free_space) |
6086 | btrfs_add_free_space(cache, start, len); | |
11833d66 YZ |
6087 | } |
6088 | ||
f0486c68 | 6089 | start += len; |
7b398f8e | 6090 | space_info = cache->space_info; |
f0486c68 | 6091 | |
7b398f8e | 6092 | spin_lock(&space_info->lock); |
11833d66 YZ |
6093 | spin_lock(&cache->lock); |
6094 | cache->pinned -= len; | |
7b398f8e | 6095 | space_info->bytes_pinned -= len; |
d288db5d | 6096 | percpu_counter_add(&space_info->total_bytes_pinned, -len); |
7b398f8e JB |
6097 | if (cache->ro) { |
6098 | space_info->bytes_readonly += len; | |
6099 | readonly = true; | |
6100 | } | |
11833d66 | 6101 | spin_unlock(&cache->lock); |
7b398f8e JB |
6102 | if (!readonly && global_rsv->space_info == space_info) { |
6103 | spin_lock(&global_rsv->lock); | |
6104 | if (!global_rsv->full) { | |
6105 | len = min(len, global_rsv->size - | |
6106 | global_rsv->reserved); | |
6107 | global_rsv->reserved += len; | |
6108 | space_info->bytes_may_use += len; | |
6109 | if (global_rsv->reserved >= global_rsv->size) | |
6110 | global_rsv->full = 1; | |
6111 | } | |
6112 | spin_unlock(&global_rsv->lock); | |
6113 | } | |
6114 | spin_unlock(&space_info->lock); | |
ccd467d6 | 6115 | } |
11833d66 YZ |
6116 | |
6117 | if (cache) | |
6118 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
6119 | return 0; |
6120 | } | |
6121 | ||
6122 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 6123 | struct btrfs_root *root) |
a28ec197 | 6124 | { |
11833d66 | 6125 | struct btrfs_fs_info *fs_info = root->fs_info; |
e33e17ee JM |
6126 | struct btrfs_block_group_cache *block_group, *tmp; |
6127 | struct list_head *deleted_bgs; | |
11833d66 | 6128 | struct extent_io_tree *unpin; |
1a5bc167 CM |
6129 | u64 start; |
6130 | u64 end; | |
a28ec197 | 6131 | int ret; |
a28ec197 | 6132 | |
11833d66 YZ |
6133 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
6134 | unpin = &fs_info->freed_extents[1]; | |
6135 | else | |
6136 | unpin = &fs_info->freed_extents[0]; | |
6137 | ||
e33e17ee | 6138 | while (!trans->aborted) { |
d4b450cd | 6139 | mutex_lock(&fs_info->unused_bg_unpin_mutex); |
1a5bc167 | 6140 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 6141 | EXTENT_DIRTY, NULL); |
d4b450cd FM |
6142 | if (ret) { |
6143 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
a28ec197 | 6144 | break; |
d4b450cd | 6145 | } |
1f3c79a2 | 6146 | |
5378e607 LD |
6147 | if (btrfs_test_opt(root, DISCARD)) |
6148 | ret = btrfs_discard_extent(root, start, | |
6149 | end + 1 - start, NULL); | |
1f3c79a2 | 6150 | |
1a5bc167 | 6151 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
678886bd | 6152 | unpin_extent_range(root, start, end, true); |
d4b450cd | 6153 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
b9473439 | 6154 | cond_resched(); |
a28ec197 | 6155 | } |
817d52f8 | 6156 | |
e33e17ee JM |
6157 | /* |
6158 | * Transaction is finished. We don't need the lock anymore. We | |
6159 | * do need to clean up the block groups in case of a transaction | |
6160 | * abort. | |
6161 | */ | |
6162 | deleted_bgs = &trans->transaction->deleted_bgs; | |
6163 | list_for_each_entry_safe(block_group, tmp, deleted_bgs, bg_list) { | |
6164 | u64 trimmed = 0; | |
6165 | ||
6166 | ret = -EROFS; | |
6167 | if (!trans->aborted) | |
6168 | ret = btrfs_discard_extent(root, | |
6169 | block_group->key.objectid, | |
6170 | block_group->key.offset, | |
6171 | &trimmed); | |
6172 | ||
6173 | list_del_init(&block_group->bg_list); | |
6174 | btrfs_put_block_group_trimming(block_group); | |
6175 | btrfs_put_block_group(block_group); | |
6176 | ||
6177 | if (ret) { | |
6178 | const char *errstr = btrfs_decode_error(ret); | |
6179 | btrfs_warn(fs_info, | |
6180 | "Discard failed while removing blockgroup: errno=%d %s\n", | |
6181 | ret, errstr); | |
6182 | } | |
6183 | } | |
6184 | ||
e20d96d6 CM |
6185 | return 0; |
6186 | } | |
6187 | ||
b150a4f1 JB |
6188 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
6189 | u64 owner, u64 root_objectid) | |
6190 | { | |
6191 | struct btrfs_space_info *space_info; | |
6192 | u64 flags; | |
6193 | ||
6194 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
6195 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
6196 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
6197 | else | |
6198 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
6199 | } else { | |
6200 | flags = BTRFS_BLOCK_GROUP_DATA; | |
6201 | } | |
6202 | ||
6203 | space_info = __find_space_info(fs_info, flags); | |
6204 | BUG_ON(!space_info); /* Logic bug */ | |
6205 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
6206 | } | |
6207 | ||
6208 | ||
5d4f98a2 YZ |
6209 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
6210 | struct btrfs_root *root, | |
c682f9b3 | 6211 | struct btrfs_delayed_ref_node *node, u64 parent, |
5d4f98a2 YZ |
6212 | u64 root_objectid, u64 owner_objectid, |
6213 | u64 owner_offset, int refs_to_drop, | |
c682f9b3 | 6214 | struct btrfs_delayed_extent_op *extent_op) |
a28ec197 | 6215 | { |
e2fa7227 | 6216 | struct btrfs_key key; |
5d4f98a2 | 6217 | struct btrfs_path *path; |
1261ec42 CM |
6218 | struct btrfs_fs_info *info = root->fs_info; |
6219 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 6220 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
6221 | struct btrfs_extent_item *ei; |
6222 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 6223 | int ret; |
5d4f98a2 | 6224 | int is_data; |
952fccac CM |
6225 | int extent_slot = 0; |
6226 | int found_extent = 0; | |
6227 | int num_to_del = 1; | |
c682f9b3 | 6228 | int no_quota = node->no_quota; |
5d4f98a2 YZ |
6229 | u32 item_size; |
6230 | u64 refs; | |
c682f9b3 QW |
6231 | u64 bytenr = node->bytenr; |
6232 | u64 num_bytes = node->num_bytes; | |
fcebe456 | 6233 | int last_ref = 0; |
3173a18f JB |
6234 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6235 | SKINNY_METADATA); | |
037e6390 | 6236 | |
fcebe456 JB |
6237 | if (!info->quota_enabled || !is_fstree(root_objectid)) |
6238 | no_quota = 1; | |
6239 | ||
5caf2a00 | 6240 | path = btrfs_alloc_path(); |
54aa1f4d CM |
6241 | if (!path) |
6242 | return -ENOMEM; | |
5f26f772 | 6243 | |
3c12ac72 | 6244 | path->reada = 1; |
b9473439 | 6245 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6246 | |
6247 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
6248 | BUG_ON(!is_data && refs_to_drop != 1); | |
6249 | ||
3173a18f JB |
6250 | if (is_data) |
6251 | skinny_metadata = 0; | |
6252 | ||
5d4f98a2 YZ |
6253 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
6254 | bytenr, num_bytes, parent, | |
6255 | root_objectid, owner_objectid, | |
6256 | owner_offset); | |
7bb86316 | 6257 | if (ret == 0) { |
952fccac | 6258 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
6259 | while (extent_slot >= 0) { |
6260 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 6261 | extent_slot); |
5d4f98a2 | 6262 | if (key.objectid != bytenr) |
952fccac | 6263 | break; |
5d4f98a2 YZ |
6264 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
6265 | key.offset == num_bytes) { | |
952fccac CM |
6266 | found_extent = 1; |
6267 | break; | |
6268 | } | |
3173a18f JB |
6269 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
6270 | key.offset == owner_objectid) { | |
6271 | found_extent = 1; | |
6272 | break; | |
6273 | } | |
952fccac CM |
6274 | if (path->slots[0] - extent_slot > 5) |
6275 | break; | |
5d4f98a2 | 6276 | extent_slot--; |
952fccac | 6277 | } |
5d4f98a2 YZ |
6278 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
6279 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
6280 | if (found_extent && item_size < sizeof(*ei)) | |
6281 | found_extent = 0; | |
6282 | #endif | |
31840ae1 | 6283 | if (!found_extent) { |
5d4f98a2 | 6284 | BUG_ON(iref); |
56bec294 | 6285 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 | 6286 | NULL, refs_to_drop, |
fcebe456 | 6287 | is_data, &last_ref); |
005d6427 DS |
6288 | if (ret) { |
6289 | btrfs_abort_transaction(trans, extent_root, ret); | |
6290 | goto out; | |
6291 | } | |
b3b4aa74 | 6292 | btrfs_release_path(path); |
b9473439 | 6293 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6294 | |
6295 | key.objectid = bytenr; | |
6296 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6297 | key.offset = num_bytes; | |
6298 | ||
3173a18f JB |
6299 | if (!is_data && skinny_metadata) { |
6300 | key.type = BTRFS_METADATA_ITEM_KEY; | |
6301 | key.offset = owner_objectid; | |
6302 | } | |
6303 | ||
31840ae1 ZY |
6304 | ret = btrfs_search_slot(trans, extent_root, |
6305 | &key, path, -1, 1); | |
3173a18f JB |
6306 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
6307 | /* | |
6308 | * Couldn't find our skinny metadata item, | |
6309 | * see if we have ye olde extent item. | |
6310 | */ | |
6311 | path->slots[0]--; | |
6312 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
6313 | path->slots[0]); | |
6314 | if (key.objectid == bytenr && | |
6315 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
6316 | key.offset == num_bytes) | |
6317 | ret = 0; | |
6318 | } | |
6319 | ||
6320 | if (ret > 0 && skinny_metadata) { | |
6321 | skinny_metadata = false; | |
9ce49a0b | 6322 | key.objectid = bytenr; |
3173a18f JB |
6323 | key.type = BTRFS_EXTENT_ITEM_KEY; |
6324 | key.offset = num_bytes; | |
6325 | btrfs_release_path(path); | |
6326 | ret = btrfs_search_slot(trans, extent_root, | |
6327 | &key, path, -1, 1); | |
6328 | } | |
6329 | ||
f3465ca4 | 6330 | if (ret) { |
c2cf52eb | 6331 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 6332 | ret, bytenr); |
b783e62d JB |
6333 | if (ret > 0) |
6334 | btrfs_print_leaf(extent_root, | |
6335 | path->nodes[0]); | |
f3465ca4 | 6336 | } |
005d6427 DS |
6337 | if (ret < 0) { |
6338 | btrfs_abort_transaction(trans, extent_root, ret); | |
6339 | goto out; | |
6340 | } | |
31840ae1 ZY |
6341 | extent_slot = path->slots[0]; |
6342 | } | |
fae7f21c | 6343 | } else if (WARN_ON(ret == -ENOENT)) { |
7bb86316 | 6344 | btrfs_print_leaf(extent_root, path->nodes[0]); |
c2cf52eb SK |
6345 | btrfs_err(info, |
6346 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
c1c9ff7c GU |
6347 | bytenr, parent, root_objectid, owner_objectid, |
6348 | owner_offset); | |
c4a050bb JB |
6349 | btrfs_abort_transaction(trans, extent_root, ret); |
6350 | goto out; | |
79787eaa | 6351 | } else { |
005d6427 DS |
6352 | btrfs_abort_transaction(trans, extent_root, ret); |
6353 | goto out; | |
7bb86316 | 6354 | } |
5f39d397 CM |
6355 | |
6356 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
6357 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
6358 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
6359 | if (item_size < sizeof(*ei)) { | |
6360 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
6361 | ret = convert_extent_item_v0(trans, extent_root, path, | |
6362 | owner_objectid, 0); | |
005d6427 DS |
6363 | if (ret < 0) { |
6364 | btrfs_abort_transaction(trans, extent_root, ret); | |
6365 | goto out; | |
6366 | } | |
5d4f98a2 | 6367 | |
b3b4aa74 | 6368 | btrfs_release_path(path); |
5d4f98a2 YZ |
6369 | path->leave_spinning = 1; |
6370 | ||
6371 | key.objectid = bytenr; | |
6372 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6373 | key.offset = num_bytes; | |
6374 | ||
6375 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
6376 | -1, 1); | |
6377 | if (ret) { | |
c2cf52eb | 6378 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 6379 | ret, bytenr); |
5d4f98a2 YZ |
6380 | btrfs_print_leaf(extent_root, path->nodes[0]); |
6381 | } | |
005d6427 DS |
6382 | if (ret < 0) { |
6383 | btrfs_abort_transaction(trans, extent_root, ret); | |
6384 | goto out; | |
6385 | } | |
6386 | ||
5d4f98a2 YZ |
6387 | extent_slot = path->slots[0]; |
6388 | leaf = path->nodes[0]; | |
6389 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
6390 | } | |
6391 | #endif | |
6392 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 6393 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 6394 | struct btrfs_extent_item); |
3173a18f JB |
6395 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
6396 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
6397 | struct btrfs_tree_block_info *bi; |
6398 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
6399 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
6400 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
6401 | } | |
56bec294 | 6402 | |
5d4f98a2 | 6403 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
6404 | if (refs < refs_to_drop) { |
6405 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
351fd353 | 6406 | "for bytenr %Lu", refs_to_drop, refs, bytenr); |
32b02538 JB |
6407 | ret = -EINVAL; |
6408 | btrfs_abort_transaction(trans, extent_root, ret); | |
6409 | goto out; | |
6410 | } | |
56bec294 | 6411 | refs -= refs_to_drop; |
5f39d397 | 6412 | |
5d4f98a2 YZ |
6413 | if (refs > 0) { |
6414 | if (extent_op) | |
6415 | __run_delayed_extent_op(extent_op, leaf, ei); | |
6416 | /* | |
6417 | * In the case of inline back ref, reference count will | |
6418 | * be updated by remove_extent_backref | |
952fccac | 6419 | */ |
5d4f98a2 YZ |
6420 | if (iref) { |
6421 | BUG_ON(!found_extent); | |
6422 | } else { | |
6423 | btrfs_set_extent_refs(leaf, ei, refs); | |
6424 | btrfs_mark_buffer_dirty(leaf); | |
6425 | } | |
6426 | if (found_extent) { | |
6427 | ret = remove_extent_backref(trans, extent_root, path, | |
6428 | iref, refs_to_drop, | |
fcebe456 | 6429 | is_data, &last_ref); |
005d6427 DS |
6430 | if (ret) { |
6431 | btrfs_abort_transaction(trans, extent_root, ret); | |
6432 | goto out; | |
6433 | } | |
952fccac | 6434 | } |
b150a4f1 JB |
6435 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
6436 | root_objectid); | |
5d4f98a2 | 6437 | } else { |
5d4f98a2 YZ |
6438 | if (found_extent) { |
6439 | BUG_ON(is_data && refs_to_drop != | |
9ed0dea0 | 6440 | extent_data_ref_count(path, iref)); |
5d4f98a2 YZ |
6441 | if (iref) { |
6442 | BUG_ON(path->slots[0] != extent_slot); | |
6443 | } else { | |
6444 | BUG_ON(path->slots[0] != extent_slot + 1); | |
6445 | path->slots[0] = extent_slot; | |
6446 | num_to_del = 2; | |
6447 | } | |
78fae27e | 6448 | } |
b9473439 | 6449 | |
fcebe456 | 6450 | last_ref = 1; |
952fccac CM |
6451 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
6452 | num_to_del); | |
005d6427 DS |
6453 | if (ret) { |
6454 | btrfs_abort_transaction(trans, extent_root, ret); | |
6455 | goto out; | |
6456 | } | |
b3b4aa74 | 6457 | btrfs_release_path(path); |
21af804c | 6458 | |
5d4f98a2 | 6459 | if (is_data) { |
459931ec | 6460 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
6461 | if (ret) { |
6462 | btrfs_abort_transaction(trans, extent_root, ret); | |
6463 | goto out; | |
6464 | } | |
459931ec CM |
6465 | } |
6466 | ||
ce93ec54 | 6467 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
005d6427 DS |
6468 | if (ret) { |
6469 | btrfs_abort_transaction(trans, extent_root, ret); | |
6470 | goto out; | |
6471 | } | |
a28ec197 | 6472 | } |
fcebe456 JB |
6473 | btrfs_release_path(path); |
6474 | ||
79787eaa | 6475 | out: |
5caf2a00 | 6476 | btrfs_free_path(path); |
a28ec197 CM |
6477 | return ret; |
6478 | } | |
6479 | ||
1887be66 | 6480 | /* |
f0486c68 | 6481 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
6482 | * delayed ref for that extent as well. This searches the delayed ref tree for |
6483 | * a given extent, and if there are no other delayed refs to be processed, it | |
6484 | * removes it from the tree. | |
6485 | */ | |
6486 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
6487 | struct btrfs_root *root, u64 bytenr) | |
6488 | { | |
6489 | struct btrfs_delayed_ref_head *head; | |
6490 | struct btrfs_delayed_ref_root *delayed_refs; | |
f0486c68 | 6491 | int ret = 0; |
1887be66 CM |
6492 | |
6493 | delayed_refs = &trans->transaction->delayed_refs; | |
6494 | spin_lock(&delayed_refs->lock); | |
6495 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
6496 | if (!head) | |
cf93da7b | 6497 | goto out_delayed_unlock; |
1887be66 | 6498 | |
d7df2c79 | 6499 | spin_lock(&head->lock); |
c6fc2454 | 6500 | if (!list_empty(&head->ref_list)) |
1887be66 CM |
6501 | goto out; |
6502 | ||
5d4f98a2 YZ |
6503 | if (head->extent_op) { |
6504 | if (!head->must_insert_reserved) | |
6505 | goto out; | |
78a6184a | 6506 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
6507 | head->extent_op = NULL; |
6508 | } | |
6509 | ||
1887be66 CM |
6510 | /* |
6511 | * waiting for the lock here would deadlock. If someone else has it | |
6512 | * locked they are already in the process of dropping it anyway | |
6513 | */ | |
6514 | if (!mutex_trylock(&head->mutex)) | |
6515 | goto out; | |
6516 | ||
6517 | /* | |
6518 | * at this point we have a head with no other entries. Go | |
6519 | * ahead and process it. | |
6520 | */ | |
6521 | head->node.in_tree = 0; | |
c46effa6 | 6522 | rb_erase(&head->href_node, &delayed_refs->href_root); |
c3e69d58 | 6523 | |
d7df2c79 | 6524 | atomic_dec(&delayed_refs->num_entries); |
1887be66 CM |
6525 | |
6526 | /* | |
6527 | * we don't take a ref on the node because we're removing it from the | |
6528 | * tree, so we just steal the ref the tree was holding. | |
6529 | */ | |
c3e69d58 | 6530 | delayed_refs->num_heads--; |
d7df2c79 | 6531 | if (head->processing == 0) |
c3e69d58 | 6532 | delayed_refs->num_heads_ready--; |
d7df2c79 JB |
6533 | head->processing = 0; |
6534 | spin_unlock(&head->lock); | |
1887be66 CM |
6535 | spin_unlock(&delayed_refs->lock); |
6536 | ||
f0486c68 YZ |
6537 | BUG_ON(head->extent_op); |
6538 | if (head->must_insert_reserved) | |
6539 | ret = 1; | |
6540 | ||
6541 | mutex_unlock(&head->mutex); | |
1887be66 | 6542 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 6543 | return ret; |
1887be66 | 6544 | out: |
d7df2c79 | 6545 | spin_unlock(&head->lock); |
cf93da7b CM |
6546 | |
6547 | out_delayed_unlock: | |
1887be66 CM |
6548 | spin_unlock(&delayed_refs->lock); |
6549 | return 0; | |
6550 | } | |
6551 | ||
f0486c68 YZ |
6552 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
6553 | struct btrfs_root *root, | |
6554 | struct extent_buffer *buf, | |
5581a51a | 6555 | u64 parent, int last_ref) |
f0486c68 | 6556 | { |
b150a4f1 | 6557 | int pin = 1; |
f0486c68 YZ |
6558 | int ret; |
6559 | ||
6560 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
6561 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6562 | buf->start, buf->len, | |
6563 | parent, root->root_key.objectid, | |
6564 | btrfs_header_level(buf), | |
5581a51a | 6565 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 6566 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
6567 | } |
6568 | ||
6569 | if (!last_ref) | |
6570 | return; | |
6571 | ||
f0486c68 | 6572 | if (btrfs_header_generation(buf) == trans->transid) { |
6219872d FM |
6573 | struct btrfs_block_group_cache *cache; |
6574 | ||
f0486c68 YZ |
6575 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
6576 | ret = check_ref_cleanup(trans, root, buf->start); | |
6577 | if (!ret) | |
37be25bc | 6578 | goto out; |
f0486c68 YZ |
6579 | } |
6580 | ||
6219872d FM |
6581 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
6582 | ||
f0486c68 YZ |
6583 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
6584 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
6219872d | 6585 | btrfs_put_block_group(cache); |
37be25bc | 6586 | goto out; |
f0486c68 YZ |
6587 | } |
6588 | ||
6589 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
6590 | ||
6591 | btrfs_add_free_space(cache, buf->start, buf->len); | |
e570fd27 | 6592 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE, 0); |
6219872d | 6593 | btrfs_put_block_group(cache); |
0be5dc67 | 6594 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); |
b150a4f1 | 6595 | pin = 0; |
f0486c68 YZ |
6596 | } |
6597 | out: | |
b150a4f1 JB |
6598 | if (pin) |
6599 | add_pinned_bytes(root->fs_info, buf->len, | |
6600 | btrfs_header_level(buf), | |
6601 | root->root_key.objectid); | |
6602 | ||
a826d6dc JB |
6603 | /* |
6604 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
6605 | * anymore. | |
6606 | */ | |
6607 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
6608 | } |
6609 | ||
79787eaa | 6610 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
6611 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
6612 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
fcebe456 | 6613 | u64 owner, u64 offset, int no_quota) |
925baedd CM |
6614 | { |
6615 | int ret; | |
66d7e7f0 | 6616 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 6617 | |
fccb84c9 | 6618 | if (btrfs_test_is_dummy_root(root)) |
faa2dbf0 | 6619 | return 0; |
fccb84c9 | 6620 | |
b150a4f1 JB |
6621 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
6622 | ||
56bec294 CM |
6623 | /* |
6624 | * tree log blocks never actually go into the extent allocation | |
6625 | * tree, just update pinning info and exit early. | |
56bec294 | 6626 | */ |
5d4f98a2 YZ |
6627 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
6628 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 6629 | /* unlocks the pinned mutex */ |
11833d66 | 6630 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 6631 | ret = 0; |
5d4f98a2 | 6632 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
6633 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
6634 | num_bytes, | |
5d4f98a2 | 6635 | parent, root_objectid, (int)owner, |
fcebe456 | 6636 | BTRFS_DROP_DELAYED_REF, NULL, no_quota); |
5d4f98a2 | 6637 | } else { |
66d7e7f0 AJ |
6638 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
6639 | num_bytes, | |
6640 | parent, root_objectid, owner, | |
6641 | offset, BTRFS_DROP_DELAYED_REF, | |
fcebe456 | 6642 | NULL, no_quota); |
56bec294 | 6643 | } |
925baedd CM |
6644 | return ret; |
6645 | } | |
6646 | ||
817d52f8 JB |
6647 | /* |
6648 | * when we wait for progress in the block group caching, its because | |
6649 | * our allocation attempt failed at least once. So, we must sleep | |
6650 | * and let some progress happen before we try again. | |
6651 | * | |
6652 | * This function will sleep at least once waiting for new free space to | |
6653 | * show up, and then it will check the block group free space numbers | |
6654 | * for our min num_bytes. Another option is to have it go ahead | |
6655 | * and look in the rbtree for a free extent of a given size, but this | |
6656 | * is a good start. | |
36cce922 JB |
6657 | * |
6658 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
6659 | * any of the information in this block group. | |
817d52f8 | 6660 | */ |
36cce922 | 6661 | static noinline void |
817d52f8 JB |
6662 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
6663 | u64 num_bytes) | |
6664 | { | |
11833d66 | 6665 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 6666 | |
11833d66 YZ |
6667 | caching_ctl = get_caching_control(cache); |
6668 | if (!caching_ctl) | |
36cce922 | 6669 | return; |
817d52f8 | 6670 | |
11833d66 | 6671 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 6672 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
6673 | |
6674 | put_caching_control(caching_ctl); | |
11833d66 YZ |
6675 | } |
6676 | ||
6677 | static noinline int | |
6678 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6679 | { | |
6680 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 6681 | int ret = 0; |
11833d66 YZ |
6682 | |
6683 | caching_ctl = get_caching_control(cache); | |
6684 | if (!caching_ctl) | |
36cce922 | 6685 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
6686 | |
6687 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
6688 | if (cache->cached == BTRFS_CACHE_ERROR) |
6689 | ret = -EIO; | |
11833d66 | 6690 | put_caching_control(caching_ctl); |
36cce922 | 6691 | return ret; |
817d52f8 JB |
6692 | } |
6693 | ||
31e50229 | 6694 | int __get_raid_index(u64 flags) |
b742bb82 | 6695 | { |
7738a53a | 6696 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 6697 | return BTRFS_RAID_RAID10; |
7738a53a | 6698 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 6699 | return BTRFS_RAID_RAID1; |
7738a53a | 6700 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 6701 | return BTRFS_RAID_DUP; |
7738a53a | 6702 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 6703 | return BTRFS_RAID_RAID0; |
53b381b3 | 6704 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 6705 | return BTRFS_RAID_RAID5; |
53b381b3 | 6706 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 6707 | return BTRFS_RAID_RAID6; |
7738a53a | 6708 | |
e942f883 | 6709 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
6710 | } |
6711 | ||
6ab0a202 | 6712 | int get_block_group_index(struct btrfs_block_group_cache *cache) |
7738a53a | 6713 | { |
31e50229 | 6714 | return __get_raid_index(cache->flags); |
7738a53a ID |
6715 | } |
6716 | ||
6ab0a202 JM |
6717 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { |
6718 | [BTRFS_RAID_RAID10] = "raid10", | |
6719 | [BTRFS_RAID_RAID1] = "raid1", | |
6720 | [BTRFS_RAID_DUP] = "dup", | |
6721 | [BTRFS_RAID_RAID0] = "raid0", | |
6722 | [BTRFS_RAID_SINGLE] = "single", | |
6723 | [BTRFS_RAID_RAID5] = "raid5", | |
6724 | [BTRFS_RAID_RAID6] = "raid6", | |
6725 | }; | |
6726 | ||
1b8e5df6 | 6727 | static const char *get_raid_name(enum btrfs_raid_types type) |
6ab0a202 JM |
6728 | { |
6729 | if (type >= BTRFS_NR_RAID_TYPES) | |
6730 | return NULL; | |
6731 | ||
6732 | return btrfs_raid_type_names[type]; | |
6733 | } | |
6734 | ||
817d52f8 | 6735 | enum btrfs_loop_type { |
285ff5af JB |
6736 | LOOP_CACHING_NOWAIT = 0, |
6737 | LOOP_CACHING_WAIT = 1, | |
6738 | LOOP_ALLOC_CHUNK = 2, | |
6739 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
6740 | }; |
6741 | ||
e570fd27 MX |
6742 | static inline void |
6743 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, | |
6744 | int delalloc) | |
6745 | { | |
6746 | if (delalloc) | |
6747 | down_read(&cache->data_rwsem); | |
6748 | } | |
6749 | ||
6750 | static inline void | |
6751 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, | |
6752 | int delalloc) | |
6753 | { | |
6754 | btrfs_get_block_group(cache); | |
6755 | if (delalloc) | |
6756 | down_read(&cache->data_rwsem); | |
6757 | } | |
6758 | ||
6759 | static struct btrfs_block_group_cache * | |
6760 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, | |
6761 | struct btrfs_free_cluster *cluster, | |
6762 | int delalloc) | |
6763 | { | |
6764 | struct btrfs_block_group_cache *used_bg; | |
6765 | bool locked = false; | |
6766 | again: | |
6767 | spin_lock(&cluster->refill_lock); | |
6768 | if (locked) { | |
6769 | if (used_bg == cluster->block_group) | |
6770 | return used_bg; | |
6771 | ||
6772 | up_read(&used_bg->data_rwsem); | |
6773 | btrfs_put_block_group(used_bg); | |
6774 | } | |
6775 | ||
6776 | used_bg = cluster->block_group; | |
6777 | if (!used_bg) | |
6778 | return NULL; | |
6779 | ||
6780 | if (used_bg == block_group) | |
6781 | return used_bg; | |
6782 | ||
6783 | btrfs_get_block_group(used_bg); | |
6784 | ||
6785 | if (!delalloc) | |
6786 | return used_bg; | |
6787 | ||
6788 | if (down_read_trylock(&used_bg->data_rwsem)) | |
6789 | return used_bg; | |
6790 | ||
6791 | spin_unlock(&cluster->refill_lock); | |
6792 | down_read(&used_bg->data_rwsem); | |
6793 | locked = true; | |
6794 | goto again; | |
6795 | } | |
6796 | ||
6797 | static inline void | |
6798 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, | |
6799 | int delalloc) | |
6800 | { | |
6801 | if (delalloc) | |
6802 | up_read(&cache->data_rwsem); | |
6803 | btrfs_put_block_group(cache); | |
6804 | } | |
6805 | ||
fec577fb CM |
6806 | /* |
6807 | * walks the btree of allocated extents and find a hole of a given size. | |
6808 | * The key ins is changed to record the hole: | |
a4820398 | 6809 | * ins->objectid == start position |
62e2749e | 6810 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
a4820398 | 6811 | * ins->offset == the size of the hole. |
fec577fb | 6812 | * Any available blocks before search_start are skipped. |
a4820398 MX |
6813 | * |
6814 | * If there is no suitable free space, we will record the max size of | |
6815 | * the free space extent currently. | |
fec577fb | 6816 | */ |
00361589 | 6817 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
98ed5174 | 6818 | u64 num_bytes, u64 empty_size, |
98ed5174 | 6819 | u64 hint_byte, struct btrfs_key *ins, |
e570fd27 | 6820 | u64 flags, int delalloc) |
fec577fb | 6821 | { |
80eb234a | 6822 | int ret = 0; |
d397712b | 6823 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 6824 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 6825 | struct btrfs_block_group_cache *block_group = NULL; |
81c9ad23 | 6826 | u64 search_start = 0; |
a4820398 | 6827 | u64 max_extent_size = 0; |
239b14b3 | 6828 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 6829 | struct btrfs_space_info *space_info; |
fa9c0d79 | 6830 | int loop = 0; |
b6919a58 DS |
6831 | int index = __get_raid_index(flags); |
6832 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
fb25e914 | 6833 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
0a24325e | 6834 | bool failed_cluster_refill = false; |
1cdda9b8 | 6835 | bool failed_alloc = false; |
67377734 | 6836 | bool use_cluster = true; |
60d2adbb | 6837 | bool have_caching_bg = false; |
fec577fb | 6838 | |
db94535d | 6839 | WARN_ON(num_bytes < root->sectorsize); |
962a298f | 6840 | ins->type = BTRFS_EXTENT_ITEM_KEY; |
80eb234a JB |
6841 | ins->objectid = 0; |
6842 | ins->offset = 0; | |
b1a4d965 | 6843 | |
b6919a58 | 6844 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
3f7de037 | 6845 | |
b6919a58 | 6846 | space_info = __find_space_info(root->fs_info, flags); |
1b1d1f66 | 6847 | if (!space_info) { |
b6919a58 | 6848 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
6849 | return -ENOSPC; |
6850 | } | |
2552d17e | 6851 | |
67377734 JB |
6852 | /* |
6853 | * If the space info is for both data and metadata it means we have a | |
6854 | * small filesystem and we can't use the clustering stuff. | |
6855 | */ | |
6856 | if (btrfs_mixed_space_info(space_info)) | |
6857 | use_cluster = false; | |
6858 | ||
b6919a58 | 6859 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 6860 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
6861 | if (!btrfs_test_opt(root, SSD)) |
6862 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
6863 | } |
6864 | ||
b6919a58 | 6865 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
67377734 | 6866 | btrfs_test_opt(root, SSD)) { |
fa9c0d79 CM |
6867 | last_ptr = &root->fs_info->data_alloc_cluster; |
6868 | } | |
0f9dd46c | 6869 | |
239b14b3 | 6870 | if (last_ptr) { |
fa9c0d79 CM |
6871 | spin_lock(&last_ptr->lock); |
6872 | if (last_ptr->block_group) | |
6873 | hint_byte = last_ptr->window_start; | |
6874 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 6875 | } |
fa9c0d79 | 6876 | |
a061fc8d | 6877 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 6878 | search_start = max(search_start, hint_byte); |
0b86a832 | 6879 | |
817d52f8 | 6880 | if (!last_ptr) |
fa9c0d79 | 6881 | empty_cluster = 0; |
fa9c0d79 | 6882 | |
2552d17e | 6883 | if (search_start == hint_byte) { |
2552d17e JB |
6884 | block_group = btrfs_lookup_block_group(root->fs_info, |
6885 | search_start); | |
817d52f8 JB |
6886 | /* |
6887 | * we don't want to use the block group if it doesn't match our | |
6888 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
6889 | * |
6890 | * However if we are re-searching with an ideal block group | |
6891 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 6892 | */ |
b6919a58 | 6893 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 6894 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6895 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6896 | if (list_empty(&block_group->list) || |
6897 | block_group->ro) { | |
6898 | /* | |
6899 | * someone is removing this block group, | |
6900 | * we can't jump into the have_block_group | |
6901 | * target because our list pointers are not | |
6902 | * valid | |
6903 | */ | |
6904 | btrfs_put_block_group(block_group); | |
6905 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6906 | } else { |
b742bb82 | 6907 | index = get_block_group_index(block_group); |
e570fd27 | 6908 | btrfs_lock_block_group(block_group, delalloc); |
44fb5511 | 6909 | goto have_block_group; |
ccf0e725 | 6910 | } |
2552d17e | 6911 | } else if (block_group) { |
fa9c0d79 | 6912 | btrfs_put_block_group(block_group); |
2552d17e | 6913 | } |
42e70e7a | 6914 | } |
2552d17e | 6915 | search: |
60d2adbb | 6916 | have_caching_bg = false; |
80eb234a | 6917 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6918 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6919 | list) { | |
6226cb0a | 6920 | u64 offset; |
817d52f8 | 6921 | int cached; |
8a1413a2 | 6922 | |
e570fd27 | 6923 | btrfs_grab_block_group(block_group, delalloc); |
2552d17e | 6924 | search_start = block_group->key.objectid; |
42e70e7a | 6925 | |
83a50de9 CM |
6926 | /* |
6927 | * this can happen if we end up cycling through all the | |
6928 | * raid types, but we want to make sure we only allocate | |
6929 | * for the proper type. | |
6930 | */ | |
b6919a58 | 6931 | if (!block_group_bits(block_group, flags)) { |
83a50de9 CM |
6932 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
6933 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6934 | BTRFS_BLOCK_GROUP_RAID5 | |
6935 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6936 | BTRFS_BLOCK_GROUP_RAID10; |
6937 | ||
6938 | /* | |
6939 | * if they asked for extra copies and this block group | |
6940 | * doesn't provide them, bail. This does allow us to | |
6941 | * fill raid0 from raid1. | |
6942 | */ | |
b6919a58 | 6943 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
6944 | goto loop; |
6945 | } | |
6946 | ||
2552d17e | 6947 | have_block_group: |
291c7d2f JB |
6948 | cached = block_group_cache_done(block_group); |
6949 | if (unlikely(!cached)) { | |
f6373bf3 | 6950 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6951 | BUG_ON(ret < 0); |
6952 | ret = 0; | |
817d52f8 JB |
6953 | } |
6954 | ||
36cce922 JB |
6955 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
6956 | goto loop; | |
ea6a478e | 6957 | if (unlikely(block_group->ro)) |
2552d17e | 6958 | goto loop; |
0f9dd46c | 6959 | |
0a24325e | 6960 | /* |
062c05c4 AO |
6961 | * Ok we want to try and use the cluster allocator, so |
6962 | * lets look there | |
0a24325e | 6963 | */ |
062c05c4 | 6964 | if (last_ptr) { |
215a63d1 | 6965 | struct btrfs_block_group_cache *used_block_group; |
8de972b4 | 6966 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6967 | /* |
6968 | * the refill lock keeps out other | |
6969 | * people trying to start a new cluster | |
6970 | */ | |
e570fd27 MX |
6971 | used_block_group = btrfs_lock_cluster(block_group, |
6972 | last_ptr, | |
6973 | delalloc); | |
6974 | if (!used_block_group) | |
44fb5511 | 6975 | goto refill_cluster; |
274bd4fb | 6976 | |
e570fd27 MX |
6977 | if (used_block_group != block_group && |
6978 | (used_block_group->ro || | |
6979 | !block_group_bits(used_block_group, flags))) | |
6980 | goto release_cluster; | |
44fb5511 | 6981 | |
274bd4fb | 6982 | offset = btrfs_alloc_from_cluster(used_block_group, |
a4820398 MX |
6983 | last_ptr, |
6984 | num_bytes, | |
6985 | used_block_group->key.objectid, | |
6986 | &max_extent_size); | |
fa9c0d79 CM |
6987 | if (offset) { |
6988 | /* we have a block, we're done */ | |
6989 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 | 6990 | trace_btrfs_reserve_extent_cluster(root, |
89d4346a MX |
6991 | used_block_group, |
6992 | search_start, num_bytes); | |
215a63d1 | 6993 | if (used_block_group != block_group) { |
e570fd27 MX |
6994 | btrfs_release_block_group(block_group, |
6995 | delalloc); | |
215a63d1 MX |
6996 | block_group = used_block_group; |
6997 | } | |
fa9c0d79 CM |
6998 | goto checks; |
6999 | } | |
7000 | ||
274bd4fb | 7001 | WARN_ON(last_ptr->block_group != used_block_group); |
e570fd27 | 7002 | release_cluster: |
062c05c4 AO |
7003 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
7004 | * set up a new clusters, so lets just skip it | |
7005 | * and let the allocator find whatever block | |
7006 | * it can find. If we reach this point, we | |
7007 | * will have tried the cluster allocator | |
7008 | * plenty of times and not have found | |
7009 | * anything, so we are likely way too | |
7010 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
7011 | * anything. |
7012 | * | |
7013 | * However, if the cluster is taken from the | |
7014 | * current block group, release the cluster | |
7015 | * first, so that we stand a better chance of | |
7016 | * succeeding in the unclustered | |
7017 | * allocation. */ | |
7018 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
e570fd27 | 7019 | used_block_group != block_group) { |
062c05c4 | 7020 | spin_unlock(&last_ptr->refill_lock); |
e570fd27 MX |
7021 | btrfs_release_block_group(used_block_group, |
7022 | delalloc); | |
062c05c4 AO |
7023 | goto unclustered_alloc; |
7024 | } | |
7025 | ||
fa9c0d79 CM |
7026 | /* |
7027 | * this cluster didn't work out, free it and | |
7028 | * start over | |
7029 | */ | |
7030 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
7031 | ||
e570fd27 MX |
7032 | if (used_block_group != block_group) |
7033 | btrfs_release_block_group(used_block_group, | |
7034 | delalloc); | |
7035 | refill_cluster: | |
a5f6f719 AO |
7036 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
7037 | spin_unlock(&last_ptr->refill_lock); | |
7038 | goto unclustered_alloc; | |
7039 | } | |
7040 | ||
8de972b4 CM |
7041 | aligned_cluster = max_t(unsigned long, |
7042 | empty_cluster + empty_size, | |
7043 | block_group->full_stripe_len); | |
7044 | ||
fa9c0d79 | 7045 | /* allocate a cluster in this block group */ |
00361589 JB |
7046 | ret = btrfs_find_space_cluster(root, block_group, |
7047 | last_ptr, search_start, | |
7048 | num_bytes, | |
7049 | aligned_cluster); | |
fa9c0d79 CM |
7050 | if (ret == 0) { |
7051 | /* | |
7052 | * now pull our allocation out of this | |
7053 | * cluster | |
7054 | */ | |
7055 | offset = btrfs_alloc_from_cluster(block_group, | |
a4820398 MX |
7056 | last_ptr, |
7057 | num_bytes, | |
7058 | search_start, | |
7059 | &max_extent_size); | |
fa9c0d79 CM |
7060 | if (offset) { |
7061 | /* we found one, proceed */ | |
7062 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
7063 | trace_btrfs_reserve_extent_cluster(root, |
7064 | block_group, search_start, | |
7065 | num_bytes); | |
fa9c0d79 CM |
7066 | goto checks; |
7067 | } | |
0a24325e JB |
7068 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
7069 | && !failed_cluster_refill) { | |
817d52f8 JB |
7070 | spin_unlock(&last_ptr->refill_lock); |
7071 | ||
0a24325e | 7072 | failed_cluster_refill = true; |
817d52f8 JB |
7073 | wait_block_group_cache_progress(block_group, |
7074 | num_bytes + empty_cluster + empty_size); | |
7075 | goto have_block_group; | |
fa9c0d79 | 7076 | } |
817d52f8 | 7077 | |
fa9c0d79 CM |
7078 | /* |
7079 | * at this point we either didn't find a cluster | |
7080 | * or we weren't able to allocate a block from our | |
7081 | * cluster. Free the cluster we've been trying | |
7082 | * to use, and go to the next block group | |
7083 | */ | |
0a24325e | 7084 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 7085 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 7086 | goto loop; |
fa9c0d79 CM |
7087 | } |
7088 | ||
062c05c4 | 7089 | unclustered_alloc: |
a5f6f719 AO |
7090 | spin_lock(&block_group->free_space_ctl->tree_lock); |
7091 | if (cached && | |
7092 | block_group->free_space_ctl->free_space < | |
7093 | num_bytes + empty_cluster + empty_size) { | |
a4820398 MX |
7094 | if (block_group->free_space_ctl->free_space > |
7095 | max_extent_size) | |
7096 | max_extent_size = | |
7097 | block_group->free_space_ctl->free_space; | |
a5f6f719 AO |
7098 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
7099 | goto loop; | |
7100 | } | |
7101 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
7102 | ||
6226cb0a | 7103 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
a4820398 MX |
7104 | num_bytes, empty_size, |
7105 | &max_extent_size); | |
1cdda9b8 JB |
7106 | /* |
7107 | * If we didn't find a chunk, and we haven't failed on this | |
7108 | * block group before, and this block group is in the middle of | |
7109 | * caching and we are ok with waiting, then go ahead and wait | |
7110 | * for progress to be made, and set failed_alloc to true. | |
7111 | * | |
7112 | * If failed_alloc is true then we've already waited on this | |
7113 | * block group once and should move on to the next block group. | |
7114 | */ | |
7115 | if (!offset && !failed_alloc && !cached && | |
7116 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 7117 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
7118 | num_bytes + empty_size); |
7119 | failed_alloc = true; | |
817d52f8 | 7120 | goto have_block_group; |
1cdda9b8 | 7121 | } else if (!offset) { |
60d2adbb MX |
7122 | if (!cached) |
7123 | have_caching_bg = true; | |
1cdda9b8 | 7124 | goto loop; |
817d52f8 | 7125 | } |
fa9c0d79 | 7126 | checks: |
4e54b17a | 7127 | search_start = ALIGN(offset, root->stripesize); |
25179201 | 7128 | |
2552d17e JB |
7129 | /* move on to the next group */ |
7130 | if (search_start + num_bytes > | |
215a63d1 MX |
7131 | block_group->key.objectid + block_group->key.offset) { |
7132 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 7133 | goto loop; |
6226cb0a | 7134 | } |
f5a31e16 | 7135 | |
f0486c68 | 7136 | if (offset < search_start) |
215a63d1 | 7137 | btrfs_add_free_space(block_group, offset, |
f0486c68 YZ |
7138 | search_start - offset); |
7139 | BUG_ON(offset > search_start); | |
2552d17e | 7140 | |
215a63d1 | 7141 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, |
e570fd27 | 7142 | alloc_type, delalloc); |
f0486c68 | 7143 | if (ret == -EAGAIN) { |
215a63d1 | 7144 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 7145 | goto loop; |
0f9dd46c | 7146 | } |
0b86a832 | 7147 | |
f0486c68 | 7148 | /* we are all good, lets return */ |
2552d17e JB |
7149 | ins->objectid = search_start; |
7150 | ins->offset = num_bytes; | |
d2fb3437 | 7151 | |
3f7de037 JB |
7152 | trace_btrfs_reserve_extent(orig_root, block_group, |
7153 | search_start, num_bytes); | |
e570fd27 | 7154 | btrfs_release_block_group(block_group, delalloc); |
2552d17e JB |
7155 | break; |
7156 | loop: | |
0a24325e | 7157 | failed_cluster_refill = false; |
1cdda9b8 | 7158 | failed_alloc = false; |
b742bb82 | 7159 | BUG_ON(index != get_block_group_index(block_group)); |
e570fd27 | 7160 | btrfs_release_block_group(block_group, delalloc); |
2552d17e JB |
7161 | } |
7162 | up_read(&space_info->groups_sem); | |
7163 | ||
60d2adbb MX |
7164 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
7165 | goto search; | |
7166 | ||
b742bb82 YZ |
7167 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
7168 | goto search; | |
7169 | ||
285ff5af | 7170 | /* |
ccf0e725 JB |
7171 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
7172 | * caching kthreads as we move along | |
817d52f8 JB |
7173 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
7174 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
7175 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
7176 | * again | |
fa9c0d79 | 7177 | */ |
723bda20 | 7178 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 7179 | index = 0; |
723bda20 | 7180 | loop++; |
817d52f8 | 7181 | if (loop == LOOP_ALLOC_CHUNK) { |
00361589 | 7182 | struct btrfs_trans_handle *trans; |
f017f15f WS |
7183 | int exist = 0; |
7184 | ||
7185 | trans = current->journal_info; | |
7186 | if (trans) | |
7187 | exist = 1; | |
7188 | else | |
7189 | trans = btrfs_join_transaction(root); | |
00361589 | 7190 | |
00361589 JB |
7191 | if (IS_ERR(trans)) { |
7192 | ret = PTR_ERR(trans); | |
7193 | goto out; | |
7194 | } | |
7195 | ||
b6919a58 | 7196 | ret = do_chunk_alloc(trans, root, flags, |
ea658bad JB |
7197 | CHUNK_ALLOC_FORCE); |
7198 | /* | |
7199 | * Do not bail out on ENOSPC since we | |
7200 | * can do more things. | |
7201 | */ | |
00361589 | 7202 | if (ret < 0 && ret != -ENOSPC) |
ea658bad JB |
7203 | btrfs_abort_transaction(trans, |
7204 | root, ret); | |
00361589 JB |
7205 | else |
7206 | ret = 0; | |
f017f15f WS |
7207 | if (!exist) |
7208 | btrfs_end_transaction(trans, root); | |
00361589 | 7209 | if (ret) |
ea658bad | 7210 | goto out; |
2552d17e JB |
7211 | } |
7212 | ||
723bda20 JB |
7213 | if (loop == LOOP_NO_EMPTY_SIZE) { |
7214 | empty_size = 0; | |
7215 | empty_cluster = 0; | |
fa9c0d79 | 7216 | } |
723bda20 JB |
7217 | |
7218 | goto search; | |
2552d17e JB |
7219 | } else if (!ins->objectid) { |
7220 | ret = -ENOSPC; | |
d82a6f1d | 7221 | } else if (ins->objectid) { |
80eb234a | 7222 | ret = 0; |
be744175 | 7223 | } |
79787eaa | 7224 | out: |
a4820398 MX |
7225 | if (ret == -ENOSPC) |
7226 | ins->offset = max_extent_size; | |
0f70abe2 | 7227 | return ret; |
fec577fb | 7228 | } |
ec44a35c | 7229 | |
9ed74f2d JB |
7230 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
7231 | int dump_block_groups) | |
0f9dd46c JB |
7232 | { |
7233 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 7234 | int index = 0; |
0f9dd46c | 7235 | |
9ed74f2d | 7236 | spin_lock(&info->lock); |
efe120a0 | 7237 | printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n", |
c1c9ff7c GU |
7238 | info->flags, |
7239 | info->total_bytes - info->bytes_used - info->bytes_pinned - | |
7240 | info->bytes_reserved - info->bytes_readonly, | |
d397712b | 7241 | (info->full) ? "" : "not "); |
efe120a0 | 7242 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " |
8929ecfa | 7243 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
c1c9ff7c GU |
7244 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
7245 | info->bytes_reserved, info->bytes_may_use, | |
7246 | info->bytes_readonly); | |
9ed74f2d JB |
7247 | spin_unlock(&info->lock); |
7248 | ||
7249 | if (!dump_block_groups) | |
7250 | return; | |
0f9dd46c | 7251 | |
80eb234a | 7252 | down_read(&info->groups_sem); |
b742bb82 YZ |
7253 | again: |
7254 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 7255 | spin_lock(&cache->lock); |
efe120a0 FH |
7256 | printk(KERN_INFO "BTRFS: " |
7257 | "block group %llu has %llu bytes, " | |
7258 | "%llu used %llu pinned %llu reserved %s\n", | |
c1c9ff7c GU |
7259 | cache->key.objectid, cache->key.offset, |
7260 | btrfs_block_group_used(&cache->item), cache->pinned, | |
7261 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
7262 | btrfs_dump_free_space(cache, bytes); |
7263 | spin_unlock(&cache->lock); | |
7264 | } | |
b742bb82 YZ |
7265 | if (++index < BTRFS_NR_RAID_TYPES) |
7266 | goto again; | |
80eb234a | 7267 | up_read(&info->groups_sem); |
0f9dd46c | 7268 | } |
e8569813 | 7269 | |
00361589 | 7270 | int btrfs_reserve_extent(struct btrfs_root *root, |
11833d66 YZ |
7271 | u64 num_bytes, u64 min_alloc_size, |
7272 | u64 empty_size, u64 hint_byte, | |
e570fd27 | 7273 | struct btrfs_key *ins, int is_data, int delalloc) |
fec577fb | 7274 | { |
9e622d6b | 7275 | bool final_tried = false; |
b6919a58 | 7276 | u64 flags; |
fec577fb | 7277 | int ret; |
925baedd | 7278 | |
b6919a58 | 7279 | flags = btrfs_get_alloc_profile(root, is_data); |
98d20f67 | 7280 | again: |
db94535d | 7281 | WARN_ON(num_bytes < root->sectorsize); |
00361589 | 7282 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
e570fd27 | 7283 | flags, delalloc); |
3b951516 | 7284 | |
9e622d6b | 7285 | if (ret == -ENOSPC) { |
a4820398 MX |
7286 | if (!final_tried && ins->offset) { |
7287 | num_bytes = min(num_bytes >> 1, ins->offset); | |
24542bf7 | 7288 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 7289 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
7290 | if (num_bytes == min_alloc_size) |
7291 | final_tried = true; | |
7292 | goto again; | |
7293 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
7294 | struct btrfs_space_info *sinfo; | |
7295 | ||
b6919a58 | 7296 | sinfo = __find_space_info(root->fs_info, flags); |
c2cf52eb | 7297 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
c1c9ff7c | 7298 | flags, num_bytes); |
53804280 JM |
7299 | if (sinfo) |
7300 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 7301 | } |
925baedd | 7302 | } |
0f9dd46c JB |
7303 | |
7304 | return ret; | |
e6dcd2dc CM |
7305 | } |
7306 | ||
e688b725 | 7307 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
e570fd27 MX |
7308 | u64 start, u64 len, |
7309 | int pin, int delalloc) | |
65b51a00 | 7310 | { |
0f9dd46c | 7311 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 7312 | int ret = 0; |
0f9dd46c | 7313 | |
0f9dd46c JB |
7314 | cache = btrfs_lookup_block_group(root->fs_info, start); |
7315 | if (!cache) { | |
c2cf52eb | 7316 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
c1c9ff7c | 7317 | start); |
0f9dd46c JB |
7318 | return -ENOSPC; |
7319 | } | |
1f3c79a2 | 7320 | |
e688b725 CM |
7321 | if (pin) |
7322 | pin_down_extent(root, cache, start, len, 1); | |
7323 | else { | |
dcc82f47 FM |
7324 | if (btrfs_test_opt(root, DISCARD)) |
7325 | ret = btrfs_discard_extent(root, start, len, NULL); | |
e688b725 | 7326 | btrfs_add_free_space(cache, start, len); |
e570fd27 | 7327 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc); |
e688b725 | 7328 | } |
31193213 | 7329 | |
fa9c0d79 | 7330 | btrfs_put_block_group(cache); |
817d52f8 | 7331 | |
1abe9b8a | 7332 | trace_btrfs_reserved_extent_free(root, start, len); |
7333 | ||
e6dcd2dc CM |
7334 | return ret; |
7335 | } | |
7336 | ||
e688b725 | 7337 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
e570fd27 | 7338 | u64 start, u64 len, int delalloc) |
e688b725 | 7339 | { |
e570fd27 | 7340 | return __btrfs_free_reserved_extent(root, start, len, 0, delalloc); |
e688b725 CM |
7341 | } |
7342 | ||
7343 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
7344 | u64 start, u64 len) | |
7345 | { | |
e570fd27 | 7346 | return __btrfs_free_reserved_extent(root, start, len, 1, 0); |
e688b725 CM |
7347 | } |
7348 | ||
5d4f98a2 YZ |
7349 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
7350 | struct btrfs_root *root, | |
7351 | u64 parent, u64 root_objectid, | |
7352 | u64 flags, u64 owner, u64 offset, | |
7353 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
7354 | { |
7355 | int ret; | |
5d4f98a2 | 7356 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 7357 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 7358 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 7359 | struct btrfs_path *path; |
5d4f98a2 YZ |
7360 | struct extent_buffer *leaf; |
7361 | int type; | |
7362 | u32 size; | |
26b8003f | 7363 | |
5d4f98a2 YZ |
7364 | if (parent > 0) |
7365 | type = BTRFS_SHARED_DATA_REF_KEY; | |
7366 | else | |
7367 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 7368 | |
5d4f98a2 | 7369 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
7370 | |
7371 | path = btrfs_alloc_path(); | |
db5b493a TI |
7372 | if (!path) |
7373 | return -ENOMEM; | |
47e4bb98 | 7374 | |
b9473439 | 7375 | path->leave_spinning = 1; |
5d4f98a2 YZ |
7376 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
7377 | ins, size); | |
79787eaa JM |
7378 | if (ret) { |
7379 | btrfs_free_path(path); | |
7380 | return ret; | |
7381 | } | |
0f9dd46c | 7382 | |
5d4f98a2 YZ |
7383 | leaf = path->nodes[0]; |
7384 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 7385 | struct btrfs_extent_item); |
5d4f98a2 YZ |
7386 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
7387 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
7388 | btrfs_set_extent_flags(leaf, extent_item, | |
7389 | flags | BTRFS_EXTENT_FLAG_DATA); | |
7390 | ||
7391 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
7392 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
7393 | if (parent > 0) { | |
7394 | struct btrfs_shared_data_ref *ref; | |
7395 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
7396 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
7397 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
7398 | } else { | |
7399 | struct btrfs_extent_data_ref *ref; | |
7400 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
7401 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
7402 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
7403 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
7404 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
7405 | } | |
47e4bb98 CM |
7406 | |
7407 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 7408 | btrfs_free_path(path); |
f510cfec | 7409 | |
ce93ec54 | 7410 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
79787eaa | 7411 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 7412 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 7413 | ins->objectid, ins->offset); |
f5947066 CM |
7414 | BUG(); |
7415 | } | |
0be5dc67 | 7416 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
e6dcd2dc CM |
7417 | return ret; |
7418 | } | |
7419 | ||
5d4f98a2 YZ |
7420 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
7421 | struct btrfs_root *root, | |
7422 | u64 parent, u64 root_objectid, | |
7423 | u64 flags, struct btrfs_disk_key *key, | |
fcebe456 JB |
7424 | int level, struct btrfs_key *ins, |
7425 | int no_quota) | |
e6dcd2dc CM |
7426 | { |
7427 | int ret; | |
5d4f98a2 YZ |
7428 | struct btrfs_fs_info *fs_info = root->fs_info; |
7429 | struct btrfs_extent_item *extent_item; | |
7430 | struct btrfs_tree_block_info *block_info; | |
7431 | struct btrfs_extent_inline_ref *iref; | |
7432 | struct btrfs_path *path; | |
7433 | struct extent_buffer *leaf; | |
3173a18f | 7434 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
fcebe456 | 7435 | u64 num_bytes = ins->offset; |
3173a18f JB |
7436 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
7437 | SKINNY_METADATA); | |
7438 | ||
7439 | if (!skinny_metadata) | |
7440 | size += sizeof(*block_info); | |
1c2308f8 | 7441 | |
5d4f98a2 | 7442 | path = btrfs_alloc_path(); |
857cc2fc JB |
7443 | if (!path) { |
7444 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, | |
707e8a07 | 7445 | root->nodesize); |
d8926bb3 | 7446 | return -ENOMEM; |
857cc2fc | 7447 | } |
56bec294 | 7448 | |
5d4f98a2 YZ |
7449 | path->leave_spinning = 1; |
7450 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
7451 | ins, size); | |
79787eaa | 7452 | if (ret) { |
dd825259 | 7453 | btrfs_free_path(path); |
857cc2fc | 7454 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
707e8a07 | 7455 | root->nodesize); |
79787eaa JM |
7456 | return ret; |
7457 | } | |
5d4f98a2 YZ |
7458 | |
7459 | leaf = path->nodes[0]; | |
7460 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
7461 | struct btrfs_extent_item); | |
7462 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
7463 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
7464 | btrfs_set_extent_flags(leaf, extent_item, | |
7465 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 7466 | |
3173a18f JB |
7467 | if (skinny_metadata) { |
7468 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
707e8a07 | 7469 | num_bytes = root->nodesize; |
3173a18f JB |
7470 | } else { |
7471 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
7472 | btrfs_set_tree_block_key(leaf, block_info, key); | |
7473 | btrfs_set_tree_block_level(leaf, block_info, level); | |
7474 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
7475 | } | |
5d4f98a2 | 7476 | |
5d4f98a2 YZ |
7477 | if (parent > 0) { |
7478 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
7479 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
7480 | BTRFS_SHARED_BLOCK_REF_KEY); | |
7481 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
7482 | } else { | |
7483 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
7484 | BTRFS_TREE_BLOCK_REF_KEY); | |
7485 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
7486 | } | |
7487 | ||
7488 | btrfs_mark_buffer_dirty(leaf); | |
7489 | btrfs_free_path(path); | |
7490 | ||
ce93ec54 JB |
7491 | ret = update_block_group(trans, root, ins->objectid, root->nodesize, |
7492 | 1); | |
79787eaa | 7493 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 7494 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 7495 | ins->objectid, ins->offset); |
5d4f98a2 YZ |
7496 | BUG(); |
7497 | } | |
0be5dc67 | 7498 | |
707e8a07 | 7499 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->nodesize); |
5d4f98a2 YZ |
7500 | return ret; |
7501 | } | |
7502 | ||
7503 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
7504 | struct btrfs_root *root, | |
7505 | u64 root_objectid, u64 owner, | |
7506 | u64 offset, struct btrfs_key *ins) | |
7507 | { | |
7508 | int ret; | |
7509 | ||
7510 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
7511 | ||
66d7e7f0 AJ |
7512 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
7513 | ins->offset, 0, | |
7514 | root_objectid, owner, offset, | |
7515 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
7516 | return ret; |
7517 | } | |
e02119d5 CM |
7518 | |
7519 | /* | |
7520 | * this is used by the tree logging recovery code. It records that | |
7521 | * an extent has been allocated and makes sure to clear the free | |
7522 | * space cache bits as well | |
7523 | */ | |
5d4f98a2 YZ |
7524 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
7525 | struct btrfs_root *root, | |
7526 | u64 root_objectid, u64 owner, u64 offset, | |
7527 | struct btrfs_key *ins) | |
e02119d5 CM |
7528 | { |
7529 | int ret; | |
7530 | struct btrfs_block_group_cache *block_group; | |
11833d66 | 7531 | |
8c2a1a30 JB |
7532 | /* |
7533 | * Mixed block groups will exclude before processing the log so we only | |
7534 | * need to do the exlude dance if this fs isn't mixed. | |
7535 | */ | |
7536 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
7537 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
b50c6e25 | 7538 | if (ret) |
8c2a1a30 | 7539 | return ret; |
11833d66 YZ |
7540 | } |
7541 | ||
8c2a1a30 JB |
7542 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
7543 | if (!block_group) | |
7544 | return -EINVAL; | |
7545 | ||
fb25e914 | 7546 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
e570fd27 | 7547 | RESERVE_ALLOC_NO_ACCOUNT, 0); |
79787eaa | 7548 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
7549 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
7550 | 0, owner, offset, ins, 1); | |
b50c6e25 | 7551 | btrfs_put_block_group(block_group); |
e02119d5 CM |
7552 | return ret; |
7553 | } | |
7554 | ||
48a3b636 ES |
7555 | static struct extent_buffer * |
7556 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
fe864576 | 7557 | u64 bytenr, int level) |
65b51a00 CM |
7558 | { |
7559 | struct extent_buffer *buf; | |
7560 | ||
a83fffb7 | 7561 | buf = btrfs_find_create_tree_block(root, bytenr); |
65b51a00 CM |
7562 | if (!buf) |
7563 | return ERR_PTR(-ENOMEM); | |
7564 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 7565 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 | 7566 | btrfs_tree_lock(buf); |
01d58472 | 7567 | clean_tree_block(trans, root->fs_info, buf); |
3083ee2e | 7568 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
7569 | |
7570 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 7571 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 7572 | |
d0c803c4 | 7573 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
656f30db | 7574 | buf->log_index = root->log_transid % 2; |
8cef4e16 YZ |
7575 | /* |
7576 | * we allow two log transactions at a time, use different | |
7577 | * EXENT bit to differentiate dirty pages. | |
7578 | */ | |
656f30db | 7579 | if (buf->log_index == 0) |
8cef4e16 YZ |
7580 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
7581 | buf->start + buf->len - 1, GFP_NOFS); | |
7582 | else | |
7583 | set_extent_new(&root->dirty_log_pages, buf->start, | |
7584 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 | 7585 | } else { |
656f30db | 7586 | buf->log_index = -1; |
d0c803c4 | 7587 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
65b51a00 | 7588 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 7589 | } |
65b51a00 | 7590 | trans->blocks_used++; |
b4ce94de | 7591 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
7592 | return buf; |
7593 | } | |
7594 | ||
f0486c68 YZ |
7595 | static struct btrfs_block_rsv * |
7596 | use_block_rsv(struct btrfs_trans_handle *trans, | |
7597 | struct btrfs_root *root, u32 blocksize) | |
7598 | { | |
7599 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 7600 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 | 7601 | int ret; |
d88033db | 7602 | bool global_updated = false; |
f0486c68 YZ |
7603 | |
7604 | block_rsv = get_block_rsv(trans, root); | |
7605 | ||
b586b323 MX |
7606 | if (unlikely(block_rsv->size == 0)) |
7607 | goto try_reserve; | |
d88033db | 7608 | again: |
f0486c68 YZ |
7609 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
7610 | if (!ret) | |
7611 | return block_rsv; | |
7612 | ||
b586b323 MX |
7613 | if (block_rsv->failfast) |
7614 | return ERR_PTR(ret); | |
7615 | ||
d88033db MX |
7616 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
7617 | global_updated = true; | |
7618 | update_global_block_rsv(root->fs_info); | |
7619 | goto again; | |
7620 | } | |
7621 | ||
b586b323 MX |
7622 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
7623 | static DEFINE_RATELIMIT_STATE(_rs, | |
7624 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
7625 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
7626 | if (__ratelimit(&_rs)) | |
7627 | WARN(1, KERN_DEBUG | |
efe120a0 | 7628 | "BTRFS: block rsv returned %d\n", ret); |
b586b323 MX |
7629 | } |
7630 | try_reserve: | |
7631 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
7632 | BTRFS_RESERVE_NO_FLUSH); | |
7633 | if (!ret) | |
7634 | return block_rsv; | |
7635 | /* | |
7636 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
7637 | * the global reserve if its space type is the same as the global |
7638 | * reservation. | |
b586b323 | 7639 | */ |
5881cfc9 MX |
7640 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
7641 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
7642 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
7643 | if (!ret) | |
7644 | return global_rsv; | |
7645 | } | |
7646 | return ERR_PTR(ret); | |
f0486c68 YZ |
7647 | } |
7648 | ||
8c2a3ca2 JB |
7649 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
7650 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
7651 | { |
7652 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 7653 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
7654 | } |
7655 | ||
fec577fb | 7656 | /* |
f0486c68 | 7657 | * finds a free extent and does all the dirty work required for allocation |
67b7859e | 7658 | * returns the tree buffer or an ERR_PTR on error. |
fec577fb | 7659 | */ |
4d75f8a9 DS |
7660 | struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, |
7661 | struct btrfs_root *root, | |
5d4f98a2 YZ |
7662 | u64 parent, u64 root_objectid, |
7663 | struct btrfs_disk_key *key, int level, | |
5581a51a | 7664 | u64 hint, u64 empty_size) |
fec577fb | 7665 | { |
e2fa7227 | 7666 | struct btrfs_key ins; |
f0486c68 | 7667 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 7668 | struct extent_buffer *buf; |
67b7859e | 7669 | struct btrfs_delayed_extent_op *extent_op; |
f0486c68 YZ |
7670 | u64 flags = 0; |
7671 | int ret; | |
4d75f8a9 | 7672 | u32 blocksize = root->nodesize; |
3173a18f JB |
7673 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
7674 | SKINNY_METADATA); | |
fec577fb | 7675 | |
fccb84c9 | 7676 | if (btrfs_test_is_dummy_root(root)) { |
faa2dbf0 | 7677 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, |
fe864576 | 7678 | level); |
faa2dbf0 JB |
7679 | if (!IS_ERR(buf)) |
7680 | root->alloc_bytenr += blocksize; | |
7681 | return buf; | |
7682 | } | |
fccb84c9 | 7683 | |
f0486c68 YZ |
7684 | block_rsv = use_block_rsv(trans, root, blocksize); |
7685 | if (IS_ERR(block_rsv)) | |
7686 | return ERR_CAST(block_rsv); | |
7687 | ||
00361589 | 7688 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
e570fd27 | 7689 | empty_size, hint, &ins, 0, 0); |
67b7859e OS |
7690 | if (ret) |
7691 | goto out_unuse; | |
55c69072 | 7692 | |
fe864576 | 7693 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, level); |
67b7859e OS |
7694 | if (IS_ERR(buf)) { |
7695 | ret = PTR_ERR(buf); | |
7696 | goto out_free_reserved; | |
7697 | } | |
f0486c68 YZ |
7698 | |
7699 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
7700 | if (parent == 0) | |
7701 | parent = ins.objectid; | |
7702 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7703 | } else | |
7704 | BUG_ON(parent > 0); | |
7705 | ||
7706 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
78a6184a | 7707 | extent_op = btrfs_alloc_delayed_extent_op(); |
67b7859e OS |
7708 | if (!extent_op) { |
7709 | ret = -ENOMEM; | |
7710 | goto out_free_buf; | |
7711 | } | |
f0486c68 YZ |
7712 | if (key) |
7713 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
7714 | else | |
7715 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
7716 | extent_op->flags_to_set = flags; | |
3173a18f JB |
7717 | if (skinny_metadata) |
7718 | extent_op->update_key = 0; | |
7719 | else | |
7720 | extent_op->update_key = 1; | |
f0486c68 YZ |
7721 | extent_op->update_flags = 1; |
7722 | extent_op->is_data = 0; | |
b1c79e09 | 7723 | extent_op->level = level; |
f0486c68 | 7724 | |
66d7e7f0 | 7725 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
67b7859e OS |
7726 | ins.objectid, ins.offset, |
7727 | parent, root_objectid, level, | |
7728 | BTRFS_ADD_DELAYED_EXTENT, | |
7729 | extent_op, 0); | |
7730 | if (ret) | |
7731 | goto out_free_delayed; | |
f0486c68 | 7732 | } |
fec577fb | 7733 | return buf; |
67b7859e OS |
7734 | |
7735 | out_free_delayed: | |
7736 | btrfs_free_delayed_extent_op(extent_op); | |
7737 | out_free_buf: | |
7738 | free_extent_buffer(buf); | |
7739 | out_free_reserved: | |
7740 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 0); | |
7741 | out_unuse: | |
7742 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); | |
7743 | return ERR_PTR(ret); | |
fec577fb | 7744 | } |
a28ec197 | 7745 | |
2c47e605 YZ |
7746 | struct walk_control { |
7747 | u64 refs[BTRFS_MAX_LEVEL]; | |
7748 | u64 flags[BTRFS_MAX_LEVEL]; | |
7749 | struct btrfs_key update_progress; | |
7750 | int stage; | |
7751 | int level; | |
7752 | int shared_level; | |
7753 | int update_ref; | |
7754 | int keep_locks; | |
1c4850e2 YZ |
7755 | int reada_slot; |
7756 | int reada_count; | |
66d7e7f0 | 7757 | int for_reloc; |
2c47e605 YZ |
7758 | }; |
7759 | ||
7760 | #define DROP_REFERENCE 1 | |
7761 | #define UPDATE_BACKREF 2 | |
7762 | ||
1c4850e2 YZ |
7763 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
7764 | struct btrfs_root *root, | |
7765 | struct walk_control *wc, | |
7766 | struct btrfs_path *path) | |
6407bf6d | 7767 | { |
1c4850e2 YZ |
7768 | u64 bytenr; |
7769 | u64 generation; | |
7770 | u64 refs; | |
94fcca9f | 7771 | u64 flags; |
5d4f98a2 | 7772 | u32 nritems; |
1c4850e2 YZ |
7773 | u32 blocksize; |
7774 | struct btrfs_key key; | |
7775 | struct extent_buffer *eb; | |
6407bf6d | 7776 | int ret; |
1c4850e2 YZ |
7777 | int slot; |
7778 | int nread = 0; | |
6407bf6d | 7779 | |
1c4850e2 YZ |
7780 | if (path->slots[wc->level] < wc->reada_slot) { |
7781 | wc->reada_count = wc->reada_count * 2 / 3; | |
7782 | wc->reada_count = max(wc->reada_count, 2); | |
7783 | } else { | |
7784 | wc->reada_count = wc->reada_count * 3 / 2; | |
7785 | wc->reada_count = min_t(int, wc->reada_count, | |
7786 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
7787 | } | |
7bb86316 | 7788 | |
1c4850e2 YZ |
7789 | eb = path->nodes[wc->level]; |
7790 | nritems = btrfs_header_nritems(eb); | |
707e8a07 | 7791 | blocksize = root->nodesize; |
bd56b302 | 7792 | |
1c4850e2 YZ |
7793 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
7794 | if (nread >= wc->reada_count) | |
7795 | break; | |
bd56b302 | 7796 | |
2dd3e67b | 7797 | cond_resched(); |
1c4850e2 YZ |
7798 | bytenr = btrfs_node_blockptr(eb, slot); |
7799 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 7800 | |
1c4850e2 YZ |
7801 | if (slot == path->slots[wc->level]) |
7802 | goto reada; | |
5d4f98a2 | 7803 | |
1c4850e2 YZ |
7804 | if (wc->stage == UPDATE_BACKREF && |
7805 | generation <= root->root_key.offset) | |
bd56b302 CM |
7806 | continue; |
7807 | ||
94fcca9f | 7808 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
7809 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
7810 | wc->level - 1, 1, &refs, | |
7811 | &flags); | |
79787eaa JM |
7812 | /* We don't care about errors in readahead. */ |
7813 | if (ret < 0) | |
7814 | continue; | |
94fcca9f YZ |
7815 | BUG_ON(refs == 0); |
7816 | ||
1c4850e2 | 7817 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
7818 | if (refs == 1) |
7819 | goto reada; | |
bd56b302 | 7820 | |
94fcca9f YZ |
7821 | if (wc->level == 1 && |
7822 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7823 | continue; | |
1c4850e2 YZ |
7824 | if (!wc->update_ref || |
7825 | generation <= root->root_key.offset) | |
7826 | continue; | |
7827 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7828 | ret = btrfs_comp_cpu_keys(&key, | |
7829 | &wc->update_progress); | |
7830 | if (ret < 0) | |
7831 | continue; | |
94fcca9f YZ |
7832 | } else { |
7833 | if (wc->level == 1 && | |
7834 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7835 | continue; | |
6407bf6d | 7836 | } |
1c4850e2 | 7837 | reada: |
d3e46fea | 7838 | readahead_tree_block(root, bytenr); |
1c4850e2 | 7839 | nread++; |
20524f02 | 7840 | } |
1c4850e2 | 7841 | wc->reada_slot = slot; |
20524f02 | 7842 | } |
2c47e605 | 7843 | |
0ed4792a QW |
7844 | /* |
7845 | * TODO: Modify related function to add related node/leaf to dirty_extent_root, | |
7846 | * for later qgroup accounting. | |
7847 | * | |
7848 | * Current, this function does nothing. | |
7849 | */ | |
1152651a MF |
7850 | static int account_leaf_items(struct btrfs_trans_handle *trans, |
7851 | struct btrfs_root *root, | |
7852 | struct extent_buffer *eb) | |
7853 | { | |
7854 | int nr = btrfs_header_nritems(eb); | |
0ed4792a | 7855 | int i, extent_type; |
1152651a MF |
7856 | struct btrfs_key key; |
7857 | struct btrfs_file_extent_item *fi; | |
7858 | u64 bytenr, num_bytes; | |
7859 | ||
7860 | for (i = 0; i < nr; i++) { | |
7861 | btrfs_item_key_to_cpu(eb, &key, i); | |
7862 | ||
7863 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
7864 | continue; | |
7865 | ||
7866 | fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
7867 | /* filter out non qgroup-accountable extents */ | |
7868 | extent_type = btrfs_file_extent_type(eb, fi); | |
7869 | ||
7870 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) | |
7871 | continue; | |
7872 | ||
7873 | bytenr = btrfs_file_extent_disk_bytenr(eb, fi); | |
7874 | if (!bytenr) | |
7875 | continue; | |
7876 | ||
7877 | num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); | |
1152651a MF |
7878 | } |
7879 | return 0; | |
7880 | } | |
7881 | ||
7882 | /* | |
7883 | * Walk up the tree from the bottom, freeing leaves and any interior | |
7884 | * nodes which have had all slots visited. If a node (leaf or | |
7885 | * interior) is freed, the node above it will have it's slot | |
7886 | * incremented. The root node will never be freed. | |
7887 | * | |
7888 | * At the end of this function, we should have a path which has all | |
7889 | * slots incremented to the next position for a search. If we need to | |
7890 | * read a new node it will be NULL and the node above it will have the | |
7891 | * correct slot selected for a later read. | |
7892 | * | |
7893 | * If we increment the root nodes slot counter past the number of | |
7894 | * elements, 1 is returned to signal completion of the search. | |
7895 | */ | |
7896 | static int adjust_slots_upwards(struct btrfs_root *root, | |
7897 | struct btrfs_path *path, int root_level) | |
7898 | { | |
7899 | int level = 0; | |
7900 | int nr, slot; | |
7901 | struct extent_buffer *eb; | |
7902 | ||
7903 | if (root_level == 0) | |
7904 | return 1; | |
7905 | ||
7906 | while (level <= root_level) { | |
7907 | eb = path->nodes[level]; | |
7908 | nr = btrfs_header_nritems(eb); | |
7909 | path->slots[level]++; | |
7910 | slot = path->slots[level]; | |
7911 | if (slot >= nr || level == 0) { | |
7912 | /* | |
7913 | * Don't free the root - we will detect this | |
7914 | * condition after our loop and return a | |
7915 | * positive value for caller to stop walking the tree. | |
7916 | */ | |
7917 | if (level != root_level) { | |
7918 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
7919 | path->locks[level] = 0; | |
7920 | ||
7921 | free_extent_buffer(eb); | |
7922 | path->nodes[level] = NULL; | |
7923 | path->slots[level] = 0; | |
7924 | } | |
7925 | } else { | |
7926 | /* | |
7927 | * We have a valid slot to walk back down | |
7928 | * from. Stop here so caller can process these | |
7929 | * new nodes. | |
7930 | */ | |
7931 | break; | |
7932 | } | |
7933 | ||
7934 | level++; | |
7935 | } | |
7936 | ||
7937 | eb = path->nodes[root_level]; | |
7938 | if (path->slots[root_level] >= btrfs_header_nritems(eb)) | |
7939 | return 1; | |
7940 | ||
7941 | return 0; | |
7942 | } | |
7943 | ||
7944 | /* | |
7945 | * root_eb is the subtree root and is locked before this function is called. | |
0ed4792a QW |
7946 | * TODO: Modify this function to mark all (including complete shared node) |
7947 | * to dirty_extent_root to allow it get accounted in qgroup. | |
1152651a MF |
7948 | */ |
7949 | static int account_shared_subtree(struct btrfs_trans_handle *trans, | |
7950 | struct btrfs_root *root, | |
7951 | struct extent_buffer *root_eb, | |
7952 | u64 root_gen, | |
7953 | int root_level) | |
7954 | { | |
7955 | int ret = 0; | |
7956 | int level; | |
7957 | struct extent_buffer *eb = root_eb; | |
7958 | struct btrfs_path *path = NULL; | |
7959 | ||
7960 | BUG_ON(root_level < 0 || root_level > BTRFS_MAX_LEVEL); | |
7961 | BUG_ON(root_eb == NULL); | |
7962 | ||
7963 | if (!root->fs_info->quota_enabled) | |
7964 | return 0; | |
7965 | ||
7966 | if (!extent_buffer_uptodate(root_eb)) { | |
7967 | ret = btrfs_read_buffer(root_eb, root_gen); | |
7968 | if (ret) | |
7969 | goto out; | |
7970 | } | |
7971 | ||
7972 | if (root_level == 0) { | |
7973 | ret = account_leaf_items(trans, root, root_eb); | |
7974 | goto out; | |
7975 | } | |
7976 | ||
7977 | path = btrfs_alloc_path(); | |
7978 | if (!path) | |
7979 | return -ENOMEM; | |
7980 | ||
7981 | /* | |
7982 | * Walk down the tree. Missing extent blocks are filled in as | |
7983 | * we go. Metadata is accounted every time we read a new | |
7984 | * extent block. | |
7985 | * | |
7986 | * When we reach a leaf, we account for file extent items in it, | |
7987 | * walk back up the tree (adjusting slot pointers as we go) | |
7988 | * and restart the search process. | |
7989 | */ | |
7990 | extent_buffer_get(root_eb); /* For path */ | |
7991 | path->nodes[root_level] = root_eb; | |
7992 | path->slots[root_level] = 0; | |
7993 | path->locks[root_level] = 0; /* so release_path doesn't try to unlock */ | |
7994 | walk_down: | |
7995 | level = root_level; | |
7996 | while (level >= 0) { | |
7997 | if (path->nodes[level] == NULL) { | |
1152651a MF |
7998 | int parent_slot; |
7999 | u64 child_gen; | |
8000 | u64 child_bytenr; | |
8001 | ||
8002 | /* We need to get child blockptr/gen from | |
8003 | * parent before we can read it. */ | |
8004 | eb = path->nodes[level + 1]; | |
8005 | parent_slot = path->slots[level + 1]; | |
8006 | child_bytenr = btrfs_node_blockptr(eb, parent_slot); | |
8007 | child_gen = btrfs_node_ptr_generation(eb, parent_slot); | |
8008 | ||
ce86cd59 | 8009 | eb = read_tree_block(root, child_bytenr, child_gen); |
64c043de LB |
8010 | if (IS_ERR(eb)) { |
8011 | ret = PTR_ERR(eb); | |
8012 | goto out; | |
8013 | } else if (!extent_buffer_uptodate(eb)) { | |
8635eda9 | 8014 | free_extent_buffer(eb); |
64c043de | 8015 | ret = -EIO; |
1152651a MF |
8016 | goto out; |
8017 | } | |
8018 | ||
8019 | path->nodes[level] = eb; | |
8020 | path->slots[level] = 0; | |
8021 | ||
8022 | btrfs_tree_read_lock(eb); | |
8023 | btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); | |
8024 | path->locks[level] = BTRFS_READ_LOCK_BLOCKING; | |
1152651a MF |
8025 | } |
8026 | ||
8027 | if (level == 0) { | |
8028 | ret = account_leaf_items(trans, root, path->nodes[level]); | |
8029 | if (ret) | |
8030 | goto out; | |
8031 | ||
8032 | /* Nonzero return here means we completed our search */ | |
8033 | ret = adjust_slots_upwards(root, path, root_level); | |
8034 | if (ret) | |
8035 | break; | |
8036 | ||
8037 | /* Restart search with new slots */ | |
8038 | goto walk_down; | |
8039 | } | |
8040 | ||
8041 | level--; | |
8042 | } | |
8043 | ||
8044 | ret = 0; | |
8045 | out: | |
8046 | btrfs_free_path(path); | |
8047 | ||
8048 | return ret; | |
8049 | } | |
8050 | ||
f82d02d9 | 8051 | /* |
2c016dc2 | 8052 | * helper to process tree block while walking down the tree. |
2c47e605 | 8053 | * |
2c47e605 YZ |
8054 | * when wc->stage == UPDATE_BACKREF, this function updates |
8055 | * back refs for pointers in the block. | |
8056 | * | |
8057 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 8058 | */ |
2c47e605 | 8059 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 8060 | struct btrfs_root *root, |
2c47e605 | 8061 | struct btrfs_path *path, |
94fcca9f | 8062 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 8063 | { |
2c47e605 YZ |
8064 | int level = wc->level; |
8065 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 8066 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
8067 | int ret; |
8068 | ||
2c47e605 YZ |
8069 | if (wc->stage == UPDATE_BACKREF && |
8070 | btrfs_header_owner(eb) != root->root_key.objectid) | |
8071 | return 1; | |
f82d02d9 | 8072 | |
2c47e605 YZ |
8073 | /* |
8074 | * when reference count of tree block is 1, it won't increase | |
8075 | * again. once full backref flag is set, we never clear it. | |
8076 | */ | |
94fcca9f YZ |
8077 | if (lookup_info && |
8078 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
8079 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
8080 | BUG_ON(!path->locks[level]); |
8081 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 8082 | eb->start, level, 1, |
2c47e605 YZ |
8083 | &wc->refs[level], |
8084 | &wc->flags[level]); | |
79787eaa JM |
8085 | BUG_ON(ret == -ENOMEM); |
8086 | if (ret) | |
8087 | return ret; | |
2c47e605 YZ |
8088 | BUG_ON(wc->refs[level] == 0); |
8089 | } | |
5d4f98a2 | 8090 | |
2c47e605 YZ |
8091 | if (wc->stage == DROP_REFERENCE) { |
8092 | if (wc->refs[level] > 1) | |
8093 | return 1; | |
f82d02d9 | 8094 | |
2c47e605 | 8095 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 8096 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8097 | path->locks[level] = 0; |
8098 | } | |
8099 | return 0; | |
8100 | } | |
f82d02d9 | 8101 | |
2c47e605 YZ |
8102 | /* wc->stage == UPDATE_BACKREF */ |
8103 | if (!(wc->flags[level] & flag)) { | |
8104 | BUG_ON(!path->locks[level]); | |
e339a6b0 | 8105 | ret = btrfs_inc_ref(trans, root, eb, 1); |
79787eaa | 8106 | BUG_ON(ret); /* -ENOMEM */ |
e339a6b0 | 8107 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8108 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 | 8109 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
b1c79e09 JB |
8110 | eb->len, flag, |
8111 | btrfs_header_level(eb), 0); | |
79787eaa | 8112 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
8113 | wc->flags[level] |= flag; |
8114 | } | |
8115 | ||
8116 | /* | |
8117 | * the block is shared by multiple trees, so it's not good to | |
8118 | * keep the tree lock | |
8119 | */ | |
8120 | if (path->locks[level] && level > 0) { | |
bd681513 | 8121 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8122 | path->locks[level] = 0; |
8123 | } | |
8124 | return 0; | |
8125 | } | |
8126 | ||
1c4850e2 | 8127 | /* |
2c016dc2 | 8128 | * helper to process tree block pointer. |
1c4850e2 YZ |
8129 | * |
8130 | * when wc->stage == DROP_REFERENCE, this function checks | |
8131 | * reference count of the block pointed to. if the block | |
8132 | * is shared and we need update back refs for the subtree | |
8133 | * rooted at the block, this function changes wc->stage to | |
8134 | * UPDATE_BACKREF. if the block is shared and there is no | |
8135 | * need to update back, this function drops the reference | |
8136 | * to the block. | |
8137 | * | |
8138 | * NOTE: return value 1 means we should stop walking down. | |
8139 | */ | |
8140 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
8141 | struct btrfs_root *root, | |
8142 | struct btrfs_path *path, | |
94fcca9f | 8143 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
8144 | { |
8145 | u64 bytenr; | |
8146 | u64 generation; | |
8147 | u64 parent; | |
8148 | u32 blocksize; | |
8149 | struct btrfs_key key; | |
8150 | struct extent_buffer *next; | |
8151 | int level = wc->level; | |
8152 | int reada = 0; | |
8153 | int ret = 0; | |
1152651a | 8154 | bool need_account = false; |
1c4850e2 YZ |
8155 | |
8156 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
8157 | path->slots[level]); | |
8158 | /* | |
8159 | * if the lower level block was created before the snapshot | |
8160 | * was created, we know there is no need to update back refs | |
8161 | * for the subtree | |
8162 | */ | |
8163 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
8164 | generation <= root->root_key.offset) { |
8165 | *lookup_info = 1; | |
1c4850e2 | 8166 | return 1; |
94fcca9f | 8167 | } |
1c4850e2 YZ |
8168 | |
8169 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
707e8a07 | 8170 | blocksize = root->nodesize; |
1c4850e2 | 8171 | |
01d58472 | 8172 | next = btrfs_find_tree_block(root->fs_info, bytenr); |
1c4850e2 | 8173 | if (!next) { |
a83fffb7 | 8174 | next = btrfs_find_create_tree_block(root, bytenr); |
90d2c51d MX |
8175 | if (!next) |
8176 | return -ENOMEM; | |
b2aaaa3b JB |
8177 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
8178 | level - 1); | |
1c4850e2 YZ |
8179 | reada = 1; |
8180 | } | |
8181 | btrfs_tree_lock(next); | |
8182 | btrfs_set_lock_blocking(next); | |
8183 | ||
3173a18f | 8184 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
8185 | &wc->refs[level - 1], |
8186 | &wc->flags[level - 1]); | |
79787eaa JM |
8187 | if (ret < 0) { |
8188 | btrfs_tree_unlock(next); | |
8189 | return ret; | |
8190 | } | |
8191 | ||
c2cf52eb SK |
8192 | if (unlikely(wc->refs[level - 1] == 0)) { |
8193 | btrfs_err(root->fs_info, "Missing references."); | |
8194 | BUG(); | |
8195 | } | |
94fcca9f | 8196 | *lookup_info = 0; |
1c4850e2 | 8197 | |
94fcca9f | 8198 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 8199 | if (wc->refs[level - 1] > 1) { |
1152651a | 8200 | need_account = true; |
94fcca9f YZ |
8201 | if (level == 1 && |
8202 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8203 | goto skip; | |
8204 | ||
1c4850e2 YZ |
8205 | if (!wc->update_ref || |
8206 | generation <= root->root_key.offset) | |
8207 | goto skip; | |
8208 | ||
8209 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
8210 | path->slots[level]); | |
8211 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
8212 | if (ret < 0) | |
8213 | goto skip; | |
8214 | ||
8215 | wc->stage = UPDATE_BACKREF; | |
8216 | wc->shared_level = level - 1; | |
8217 | } | |
94fcca9f YZ |
8218 | } else { |
8219 | if (level == 1 && | |
8220 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8221 | goto skip; | |
1c4850e2 YZ |
8222 | } |
8223 | ||
b9fab919 | 8224 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
8225 | btrfs_tree_unlock(next); |
8226 | free_extent_buffer(next); | |
8227 | next = NULL; | |
94fcca9f | 8228 | *lookup_info = 1; |
1c4850e2 YZ |
8229 | } |
8230 | ||
8231 | if (!next) { | |
8232 | if (reada && level == 1) | |
8233 | reada_walk_down(trans, root, wc, path); | |
ce86cd59 | 8234 | next = read_tree_block(root, bytenr, generation); |
64c043de LB |
8235 | if (IS_ERR(next)) { |
8236 | return PTR_ERR(next); | |
8237 | } else if (!extent_buffer_uptodate(next)) { | |
416bc658 | 8238 | free_extent_buffer(next); |
97d9a8a4 | 8239 | return -EIO; |
416bc658 | 8240 | } |
1c4850e2 YZ |
8241 | btrfs_tree_lock(next); |
8242 | btrfs_set_lock_blocking(next); | |
8243 | } | |
8244 | ||
8245 | level--; | |
8246 | BUG_ON(level != btrfs_header_level(next)); | |
8247 | path->nodes[level] = next; | |
8248 | path->slots[level] = 0; | |
bd681513 | 8249 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
8250 | wc->level = level; |
8251 | if (wc->level == 1) | |
8252 | wc->reada_slot = 0; | |
8253 | return 0; | |
8254 | skip: | |
8255 | wc->refs[level - 1] = 0; | |
8256 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
8257 | if (wc->stage == DROP_REFERENCE) { |
8258 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
8259 | parent = path->nodes[level]->start; | |
8260 | } else { | |
8261 | BUG_ON(root->root_key.objectid != | |
8262 | btrfs_header_owner(path->nodes[level])); | |
8263 | parent = 0; | |
8264 | } | |
1c4850e2 | 8265 | |
1152651a MF |
8266 | if (need_account) { |
8267 | ret = account_shared_subtree(trans, root, next, | |
8268 | generation, level - 1); | |
8269 | if (ret) { | |
94647322 DS |
8270 | btrfs_err_rl(root->fs_info, |
8271 | "Error " | |
1152651a | 8272 | "%d accounting shared subtree. Quota " |
94647322 DS |
8273 | "is out of sync, rescan required.", |
8274 | ret); | |
1152651a MF |
8275 | } |
8276 | } | |
94fcca9f | 8277 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 8278 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 8279 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 8280 | } |
1c4850e2 YZ |
8281 | btrfs_tree_unlock(next); |
8282 | free_extent_buffer(next); | |
94fcca9f | 8283 | *lookup_info = 1; |
1c4850e2 YZ |
8284 | return 1; |
8285 | } | |
8286 | ||
2c47e605 | 8287 | /* |
2c016dc2 | 8288 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
8289 | * |
8290 | * when wc->stage == DROP_REFERENCE, this function drops | |
8291 | * reference count on the block. | |
8292 | * | |
8293 | * when wc->stage == UPDATE_BACKREF, this function changes | |
8294 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
8295 | * to UPDATE_BACKREF previously while processing the block. | |
8296 | * | |
8297 | * NOTE: return value 1 means we should stop walking up. | |
8298 | */ | |
8299 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
8300 | struct btrfs_root *root, | |
8301 | struct btrfs_path *path, | |
8302 | struct walk_control *wc) | |
8303 | { | |
f0486c68 | 8304 | int ret; |
2c47e605 YZ |
8305 | int level = wc->level; |
8306 | struct extent_buffer *eb = path->nodes[level]; | |
8307 | u64 parent = 0; | |
8308 | ||
8309 | if (wc->stage == UPDATE_BACKREF) { | |
8310 | BUG_ON(wc->shared_level < level); | |
8311 | if (level < wc->shared_level) | |
8312 | goto out; | |
8313 | ||
2c47e605 YZ |
8314 | ret = find_next_key(path, level + 1, &wc->update_progress); |
8315 | if (ret > 0) | |
8316 | wc->update_ref = 0; | |
8317 | ||
8318 | wc->stage = DROP_REFERENCE; | |
8319 | wc->shared_level = -1; | |
8320 | path->slots[level] = 0; | |
8321 | ||
8322 | /* | |
8323 | * check reference count again if the block isn't locked. | |
8324 | * we should start walking down the tree again if reference | |
8325 | * count is one. | |
8326 | */ | |
8327 | if (!path->locks[level]) { | |
8328 | BUG_ON(level == 0); | |
8329 | btrfs_tree_lock(eb); | |
8330 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8331 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
8332 | |
8333 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 8334 | eb->start, level, 1, |
2c47e605 YZ |
8335 | &wc->refs[level], |
8336 | &wc->flags[level]); | |
79787eaa JM |
8337 | if (ret < 0) { |
8338 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 8339 | path->locks[level] = 0; |
79787eaa JM |
8340 | return ret; |
8341 | } | |
2c47e605 YZ |
8342 | BUG_ON(wc->refs[level] == 0); |
8343 | if (wc->refs[level] == 1) { | |
bd681513 | 8344 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 8345 | path->locks[level] = 0; |
2c47e605 YZ |
8346 | return 1; |
8347 | } | |
f82d02d9 | 8348 | } |
2c47e605 | 8349 | } |
f82d02d9 | 8350 | |
2c47e605 YZ |
8351 | /* wc->stage == DROP_REFERENCE */ |
8352 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 8353 | |
2c47e605 YZ |
8354 | if (wc->refs[level] == 1) { |
8355 | if (level == 0) { | |
8356 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
e339a6b0 | 8357 | ret = btrfs_dec_ref(trans, root, eb, 1); |
2c47e605 | 8358 | else |
e339a6b0 | 8359 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8360 | BUG_ON(ret); /* -ENOMEM */ |
1152651a MF |
8361 | ret = account_leaf_items(trans, root, eb); |
8362 | if (ret) { | |
94647322 DS |
8363 | btrfs_err_rl(root->fs_info, |
8364 | "error " | |
1152651a | 8365 | "%d accounting leaf items. Quota " |
94647322 DS |
8366 | "is out of sync, rescan required.", |
8367 | ret); | |
1152651a | 8368 | } |
2c47e605 YZ |
8369 | } |
8370 | /* make block locked assertion in clean_tree_block happy */ | |
8371 | if (!path->locks[level] && | |
8372 | btrfs_header_generation(eb) == trans->transid) { | |
8373 | btrfs_tree_lock(eb); | |
8374 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8375 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 8376 | } |
01d58472 | 8377 | clean_tree_block(trans, root->fs_info, eb); |
2c47e605 YZ |
8378 | } |
8379 | ||
8380 | if (eb == root->node) { | |
8381 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8382 | parent = eb->start; | |
8383 | else | |
8384 | BUG_ON(root->root_key.objectid != | |
8385 | btrfs_header_owner(eb)); | |
8386 | } else { | |
8387 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8388 | parent = path->nodes[level + 1]->start; | |
8389 | else | |
8390 | BUG_ON(root->root_key.objectid != | |
8391 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 8392 | } |
f82d02d9 | 8393 | |
5581a51a | 8394 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
8395 | out: |
8396 | wc->refs[level] = 0; | |
8397 | wc->flags[level] = 0; | |
f0486c68 | 8398 | return 0; |
2c47e605 YZ |
8399 | } |
8400 | ||
8401 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
8402 | struct btrfs_root *root, | |
8403 | struct btrfs_path *path, | |
8404 | struct walk_control *wc) | |
8405 | { | |
2c47e605 | 8406 | int level = wc->level; |
94fcca9f | 8407 | int lookup_info = 1; |
2c47e605 YZ |
8408 | int ret; |
8409 | ||
8410 | while (level >= 0) { | |
94fcca9f | 8411 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
8412 | if (ret > 0) |
8413 | break; | |
8414 | ||
8415 | if (level == 0) | |
8416 | break; | |
8417 | ||
7a7965f8 YZ |
8418 | if (path->slots[level] >= |
8419 | btrfs_header_nritems(path->nodes[level])) | |
8420 | break; | |
8421 | ||
94fcca9f | 8422 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
8423 | if (ret > 0) { |
8424 | path->slots[level]++; | |
8425 | continue; | |
90d2c51d MX |
8426 | } else if (ret < 0) |
8427 | return ret; | |
1c4850e2 | 8428 | level = wc->level; |
f82d02d9 | 8429 | } |
f82d02d9 YZ |
8430 | return 0; |
8431 | } | |
8432 | ||
d397712b | 8433 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 8434 | struct btrfs_root *root, |
f82d02d9 | 8435 | struct btrfs_path *path, |
2c47e605 | 8436 | struct walk_control *wc, int max_level) |
20524f02 | 8437 | { |
2c47e605 | 8438 | int level = wc->level; |
20524f02 | 8439 | int ret; |
9f3a7427 | 8440 | |
2c47e605 YZ |
8441 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
8442 | while (level < max_level && path->nodes[level]) { | |
8443 | wc->level = level; | |
8444 | if (path->slots[level] + 1 < | |
8445 | btrfs_header_nritems(path->nodes[level])) { | |
8446 | path->slots[level]++; | |
20524f02 CM |
8447 | return 0; |
8448 | } else { | |
2c47e605 YZ |
8449 | ret = walk_up_proc(trans, root, path, wc); |
8450 | if (ret > 0) | |
8451 | return 0; | |
bd56b302 | 8452 | |
2c47e605 | 8453 | if (path->locks[level]) { |
bd681513 CM |
8454 | btrfs_tree_unlock_rw(path->nodes[level], |
8455 | path->locks[level]); | |
2c47e605 | 8456 | path->locks[level] = 0; |
f82d02d9 | 8457 | } |
2c47e605 YZ |
8458 | free_extent_buffer(path->nodes[level]); |
8459 | path->nodes[level] = NULL; | |
8460 | level++; | |
20524f02 CM |
8461 | } |
8462 | } | |
8463 | return 1; | |
8464 | } | |
8465 | ||
9aca1d51 | 8466 | /* |
2c47e605 YZ |
8467 | * drop a subvolume tree. |
8468 | * | |
8469 | * this function traverses the tree freeing any blocks that only | |
8470 | * referenced by the tree. | |
8471 | * | |
8472 | * when a shared tree block is found. this function decreases its | |
8473 | * reference count by one. if update_ref is true, this function | |
8474 | * also make sure backrefs for the shared block and all lower level | |
8475 | * blocks are properly updated. | |
9d1a2a3a DS |
8476 | * |
8477 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 8478 | */ |
2c536799 | 8479 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
8480 | struct btrfs_block_rsv *block_rsv, int update_ref, |
8481 | int for_reloc) | |
20524f02 | 8482 | { |
5caf2a00 | 8483 | struct btrfs_path *path; |
2c47e605 YZ |
8484 | struct btrfs_trans_handle *trans; |
8485 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 8486 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
8487 | struct walk_control *wc; |
8488 | struct btrfs_key key; | |
8489 | int err = 0; | |
8490 | int ret; | |
8491 | int level; | |
d29a9f62 | 8492 | bool root_dropped = false; |
20524f02 | 8493 | |
1152651a MF |
8494 | btrfs_debug(root->fs_info, "Drop subvolume %llu", root->objectid); |
8495 | ||
5caf2a00 | 8496 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
8497 | if (!path) { |
8498 | err = -ENOMEM; | |
8499 | goto out; | |
8500 | } | |
20524f02 | 8501 | |
2c47e605 | 8502 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
8503 | if (!wc) { |
8504 | btrfs_free_path(path); | |
cb1b69f4 TI |
8505 | err = -ENOMEM; |
8506 | goto out; | |
38a1a919 | 8507 | } |
2c47e605 | 8508 | |
a22285a6 | 8509 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
8510 | if (IS_ERR(trans)) { |
8511 | err = PTR_ERR(trans); | |
8512 | goto out_free; | |
8513 | } | |
98d5dc13 | 8514 | |
3fd0a558 YZ |
8515 | if (block_rsv) |
8516 | trans->block_rsv = block_rsv; | |
2c47e605 | 8517 | |
9f3a7427 | 8518 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 8519 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
8520 | path->nodes[level] = btrfs_lock_root_node(root); |
8521 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 8522 | path->slots[level] = 0; |
bd681513 | 8523 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
8524 | memset(&wc->update_progress, 0, |
8525 | sizeof(wc->update_progress)); | |
9f3a7427 | 8526 | } else { |
9f3a7427 | 8527 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
8528 | memcpy(&wc->update_progress, &key, |
8529 | sizeof(wc->update_progress)); | |
8530 | ||
6702ed49 | 8531 | level = root_item->drop_level; |
2c47e605 | 8532 | BUG_ON(level == 0); |
6702ed49 | 8533 | path->lowest_level = level; |
2c47e605 YZ |
8534 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
8535 | path->lowest_level = 0; | |
8536 | if (ret < 0) { | |
8537 | err = ret; | |
79787eaa | 8538 | goto out_end_trans; |
9f3a7427 | 8539 | } |
1c4850e2 | 8540 | WARN_ON(ret > 0); |
2c47e605 | 8541 | |
7d9eb12c CM |
8542 | /* |
8543 | * unlock our path, this is safe because only this | |
8544 | * function is allowed to delete this snapshot | |
8545 | */ | |
5d4f98a2 | 8546 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
8547 | |
8548 | level = btrfs_header_level(root->node); | |
8549 | while (1) { | |
8550 | btrfs_tree_lock(path->nodes[level]); | |
8551 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 8552 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
8553 | |
8554 | ret = btrfs_lookup_extent_info(trans, root, | |
8555 | path->nodes[level]->start, | |
3173a18f | 8556 | level, 1, &wc->refs[level], |
2c47e605 | 8557 | &wc->flags[level]); |
79787eaa JM |
8558 | if (ret < 0) { |
8559 | err = ret; | |
8560 | goto out_end_trans; | |
8561 | } | |
2c47e605 YZ |
8562 | BUG_ON(wc->refs[level] == 0); |
8563 | ||
8564 | if (level == root_item->drop_level) | |
8565 | break; | |
8566 | ||
8567 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 8568 | path->locks[level] = 0; |
2c47e605 YZ |
8569 | WARN_ON(wc->refs[level] != 1); |
8570 | level--; | |
8571 | } | |
9f3a7427 | 8572 | } |
2c47e605 YZ |
8573 | |
8574 | wc->level = level; | |
8575 | wc->shared_level = -1; | |
8576 | wc->stage = DROP_REFERENCE; | |
8577 | wc->update_ref = update_ref; | |
8578 | wc->keep_locks = 0; | |
66d7e7f0 | 8579 | wc->for_reloc = for_reloc; |
1c4850e2 | 8580 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 8581 | |
d397712b | 8582 | while (1) { |
9d1a2a3a | 8583 | |
2c47e605 YZ |
8584 | ret = walk_down_tree(trans, root, path, wc); |
8585 | if (ret < 0) { | |
8586 | err = ret; | |
20524f02 | 8587 | break; |
2c47e605 | 8588 | } |
9aca1d51 | 8589 | |
2c47e605 YZ |
8590 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
8591 | if (ret < 0) { | |
8592 | err = ret; | |
20524f02 | 8593 | break; |
2c47e605 YZ |
8594 | } |
8595 | ||
8596 | if (ret > 0) { | |
8597 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
8598 | break; |
8599 | } | |
2c47e605 YZ |
8600 | |
8601 | if (wc->stage == DROP_REFERENCE) { | |
8602 | level = wc->level; | |
8603 | btrfs_node_key(path->nodes[level], | |
8604 | &root_item->drop_progress, | |
8605 | path->slots[level]); | |
8606 | root_item->drop_level = level; | |
8607 | } | |
8608 | ||
8609 | BUG_ON(wc->level == 0); | |
3c8f2422 JB |
8610 | if (btrfs_should_end_transaction(trans, tree_root) || |
8611 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
2c47e605 YZ |
8612 | ret = btrfs_update_root(trans, tree_root, |
8613 | &root->root_key, | |
8614 | root_item); | |
79787eaa JM |
8615 | if (ret) { |
8616 | btrfs_abort_transaction(trans, tree_root, ret); | |
8617 | err = ret; | |
8618 | goto out_end_trans; | |
8619 | } | |
2c47e605 | 8620 | |
3fd0a558 | 8621 | btrfs_end_transaction_throttle(trans, tree_root); |
3c8f2422 | 8622 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
efe120a0 | 8623 | pr_debug("BTRFS: drop snapshot early exit\n"); |
3c8f2422 JB |
8624 | err = -EAGAIN; |
8625 | goto out_free; | |
8626 | } | |
8627 | ||
a22285a6 | 8628 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
8629 | if (IS_ERR(trans)) { |
8630 | err = PTR_ERR(trans); | |
8631 | goto out_free; | |
8632 | } | |
3fd0a558 YZ |
8633 | if (block_rsv) |
8634 | trans->block_rsv = block_rsv; | |
c3e69d58 | 8635 | } |
20524f02 | 8636 | } |
b3b4aa74 | 8637 | btrfs_release_path(path); |
79787eaa JM |
8638 | if (err) |
8639 | goto out_end_trans; | |
2c47e605 YZ |
8640 | |
8641 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
8642 | if (ret) { |
8643 | btrfs_abort_transaction(trans, tree_root, ret); | |
8644 | goto out_end_trans; | |
8645 | } | |
2c47e605 | 8646 | |
76dda93c | 8647 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
8648 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
8649 | NULL, NULL); | |
79787eaa JM |
8650 | if (ret < 0) { |
8651 | btrfs_abort_transaction(trans, tree_root, ret); | |
8652 | err = ret; | |
8653 | goto out_end_trans; | |
8654 | } else if (ret > 0) { | |
84cd948c JB |
8655 | /* if we fail to delete the orphan item this time |
8656 | * around, it'll get picked up the next time. | |
8657 | * | |
8658 | * The most common failure here is just -ENOENT. | |
8659 | */ | |
8660 | btrfs_del_orphan_item(trans, tree_root, | |
8661 | root->root_key.objectid); | |
76dda93c YZ |
8662 | } |
8663 | } | |
8664 | ||
27cdeb70 | 8665 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { |
2b9dbef2 | 8666 | btrfs_add_dropped_root(trans, root); |
76dda93c YZ |
8667 | } else { |
8668 | free_extent_buffer(root->node); | |
8669 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 8670 | btrfs_put_fs_root(root); |
76dda93c | 8671 | } |
d29a9f62 | 8672 | root_dropped = true; |
79787eaa | 8673 | out_end_trans: |
3fd0a558 | 8674 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 8675 | out_free: |
2c47e605 | 8676 | kfree(wc); |
5caf2a00 | 8677 | btrfs_free_path(path); |
cb1b69f4 | 8678 | out: |
d29a9f62 JB |
8679 | /* |
8680 | * So if we need to stop dropping the snapshot for whatever reason we | |
8681 | * need to make sure to add it back to the dead root list so that we | |
8682 | * keep trying to do the work later. This also cleans up roots if we | |
8683 | * don't have it in the radix (like when we recover after a power fail | |
8684 | * or unmount) so we don't leak memory. | |
8685 | */ | |
b37b39cd | 8686 | if (!for_reloc && root_dropped == false) |
d29a9f62 | 8687 | btrfs_add_dead_root(root); |
90515e7f | 8688 | if (err && err != -EAGAIN) |
a4553fef | 8689 | btrfs_std_error(root->fs_info, err, NULL); |
2c536799 | 8690 | return err; |
20524f02 | 8691 | } |
9078a3e1 | 8692 | |
2c47e605 YZ |
8693 | /* |
8694 | * drop subtree rooted at tree block 'node'. | |
8695 | * | |
8696 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 8697 | * only used by relocation code |
2c47e605 | 8698 | */ |
f82d02d9 YZ |
8699 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
8700 | struct btrfs_root *root, | |
8701 | struct extent_buffer *node, | |
8702 | struct extent_buffer *parent) | |
8703 | { | |
8704 | struct btrfs_path *path; | |
2c47e605 | 8705 | struct walk_control *wc; |
f82d02d9 YZ |
8706 | int level; |
8707 | int parent_level; | |
8708 | int ret = 0; | |
8709 | int wret; | |
8710 | ||
2c47e605 YZ |
8711 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
8712 | ||
f82d02d9 | 8713 | path = btrfs_alloc_path(); |
db5b493a TI |
8714 | if (!path) |
8715 | return -ENOMEM; | |
f82d02d9 | 8716 | |
2c47e605 | 8717 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
8718 | if (!wc) { |
8719 | btrfs_free_path(path); | |
8720 | return -ENOMEM; | |
8721 | } | |
2c47e605 | 8722 | |
b9447ef8 | 8723 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
8724 | parent_level = btrfs_header_level(parent); |
8725 | extent_buffer_get(parent); | |
8726 | path->nodes[parent_level] = parent; | |
8727 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
8728 | ||
b9447ef8 | 8729 | btrfs_assert_tree_locked(node); |
f82d02d9 | 8730 | level = btrfs_header_level(node); |
f82d02d9 YZ |
8731 | path->nodes[level] = node; |
8732 | path->slots[level] = 0; | |
bd681513 | 8733 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
8734 | |
8735 | wc->refs[parent_level] = 1; | |
8736 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
8737 | wc->level = level; | |
8738 | wc->shared_level = -1; | |
8739 | wc->stage = DROP_REFERENCE; | |
8740 | wc->update_ref = 0; | |
8741 | wc->keep_locks = 1; | |
66d7e7f0 | 8742 | wc->for_reloc = 1; |
1c4850e2 | 8743 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
8744 | |
8745 | while (1) { | |
2c47e605 YZ |
8746 | wret = walk_down_tree(trans, root, path, wc); |
8747 | if (wret < 0) { | |
f82d02d9 | 8748 | ret = wret; |
f82d02d9 | 8749 | break; |
2c47e605 | 8750 | } |
f82d02d9 | 8751 | |
2c47e605 | 8752 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
8753 | if (wret < 0) |
8754 | ret = wret; | |
8755 | if (wret != 0) | |
8756 | break; | |
8757 | } | |
8758 | ||
2c47e605 | 8759 | kfree(wc); |
f82d02d9 YZ |
8760 | btrfs_free_path(path); |
8761 | return ret; | |
8762 | } | |
8763 | ||
ec44a35c CM |
8764 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
8765 | { | |
8766 | u64 num_devices; | |
fc67c450 | 8767 | u64 stripped; |
e4d8ec0f | 8768 | |
fc67c450 ID |
8769 | /* |
8770 | * if restripe for this chunk_type is on pick target profile and | |
8771 | * return, otherwise do the usual balance | |
8772 | */ | |
8773 | stripped = get_restripe_target(root->fs_info, flags); | |
8774 | if (stripped) | |
8775 | return extended_to_chunk(stripped); | |
e4d8ec0f | 8776 | |
95669976 | 8777 | num_devices = root->fs_info->fs_devices->rw_devices; |
cd02dca5 | 8778 | |
fc67c450 | 8779 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 8780 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
8781 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
8782 | ||
ec44a35c CM |
8783 | if (num_devices == 1) { |
8784 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
8785 | stripped = flags & ~stripped; | |
8786 | ||
8787 | /* turn raid0 into single device chunks */ | |
8788 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
8789 | return stripped; | |
8790 | ||
8791 | /* turn mirroring into duplication */ | |
8792 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
8793 | BTRFS_BLOCK_GROUP_RAID10)) | |
8794 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
8795 | } else { |
8796 | /* they already had raid on here, just return */ | |
ec44a35c CM |
8797 | if (flags & stripped) |
8798 | return flags; | |
8799 | ||
8800 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
8801 | stripped = flags & ~stripped; | |
8802 | ||
8803 | /* switch duplicated blocks with raid1 */ | |
8804 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
8805 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
8806 | ||
e3176ca2 | 8807 | /* this is drive concat, leave it alone */ |
ec44a35c | 8808 | } |
e3176ca2 | 8809 | |
ec44a35c CM |
8810 | return flags; |
8811 | } | |
8812 | ||
868f401a | 8813 | static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 8814 | { |
f0486c68 YZ |
8815 | struct btrfs_space_info *sinfo = cache->space_info; |
8816 | u64 num_bytes; | |
199c36ea | 8817 | u64 min_allocable_bytes; |
f0486c68 | 8818 | int ret = -ENOSPC; |
0ef3e66b | 8819 | |
199c36ea MX |
8820 | /* |
8821 | * We need some metadata space and system metadata space for | |
8822 | * allocating chunks in some corner cases until we force to set | |
8823 | * it to be readonly. | |
8824 | */ | |
8825 | if ((sinfo->flags & | |
8826 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
8827 | !force) | |
8828 | min_allocable_bytes = 1 * 1024 * 1024; | |
8829 | else | |
8830 | min_allocable_bytes = 0; | |
8831 | ||
f0486c68 YZ |
8832 | spin_lock(&sinfo->lock); |
8833 | spin_lock(&cache->lock); | |
61cfea9b W |
8834 | |
8835 | if (cache->ro) { | |
868f401a | 8836 | cache->ro++; |
61cfea9b W |
8837 | ret = 0; |
8838 | goto out; | |
8839 | } | |
8840 | ||
f0486c68 YZ |
8841 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
8842 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8843 | ||
8844 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
8845 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
8846 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 8847 | sinfo->bytes_readonly += num_bytes; |
868f401a | 8848 | cache->ro++; |
633c0aad | 8849 | list_add_tail(&cache->ro_list, &sinfo->ro_bgs); |
f0486c68 YZ |
8850 | ret = 0; |
8851 | } | |
61cfea9b | 8852 | out: |
f0486c68 YZ |
8853 | spin_unlock(&cache->lock); |
8854 | spin_unlock(&sinfo->lock); | |
8855 | return ret; | |
8856 | } | |
7d9eb12c | 8857 | |
868f401a | 8858 | int btrfs_inc_block_group_ro(struct btrfs_root *root, |
f0486c68 | 8859 | struct btrfs_block_group_cache *cache) |
c286ac48 | 8860 | |
f0486c68 YZ |
8861 | { |
8862 | struct btrfs_trans_handle *trans; | |
8863 | u64 alloc_flags; | |
8864 | int ret; | |
7d9eb12c | 8865 | |
1bbc621e | 8866 | again: |
ff5714cc | 8867 | trans = btrfs_join_transaction(root); |
79787eaa JM |
8868 | if (IS_ERR(trans)) |
8869 | return PTR_ERR(trans); | |
5d4f98a2 | 8870 | |
1bbc621e CM |
8871 | /* |
8872 | * we're not allowed to set block groups readonly after the dirty | |
8873 | * block groups cache has started writing. If it already started, | |
8874 | * back off and let this transaction commit | |
8875 | */ | |
8876 | mutex_lock(&root->fs_info->ro_block_group_mutex); | |
8877 | if (trans->transaction->dirty_bg_run) { | |
8878 | u64 transid = trans->transid; | |
8879 | ||
8880 | mutex_unlock(&root->fs_info->ro_block_group_mutex); | |
8881 | btrfs_end_transaction(trans, root); | |
8882 | ||
8883 | ret = btrfs_wait_for_commit(root, transid); | |
8884 | if (ret) | |
8885 | return ret; | |
8886 | goto again; | |
8887 | } | |
8888 | ||
153c35b6 CM |
8889 | /* |
8890 | * if we are changing raid levels, try to allocate a corresponding | |
8891 | * block group with the new raid level. | |
8892 | */ | |
8893 | alloc_flags = update_block_group_flags(root, cache->flags); | |
8894 | if (alloc_flags != cache->flags) { | |
8895 | ret = do_chunk_alloc(trans, root, alloc_flags, | |
8896 | CHUNK_ALLOC_FORCE); | |
8897 | /* | |
8898 | * ENOSPC is allowed here, we may have enough space | |
8899 | * already allocated at the new raid level to | |
8900 | * carry on | |
8901 | */ | |
8902 | if (ret == -ENOSPC) | |
8903 | ret = 0; | |
8904 | if (ret < 0) | |
8905 | goto out; | |
8906 | } | |
1bbc621e | 8907 | |
868f401a | 8908 | ret = inc_block_group_ro(cache, 0); |
f0486c68 YZ |
8909 | if (!ret) |
8910 | goto out; | |
8911 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 8912 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 8913 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
8914 | if (ret < 0) |
8915 | goto out; | |
868f401a | 8916 | ret = inc_block_group_ro(cache, 0); |
f0486c68 | 8917 | out: |
2f081088 SL |
8918 | if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
8919 | alloc_flags = update_block_group_flags(root, cache->flags); | |
a9629596 | 8920 | lock_chunks(root->fs_info->chunk_root); |
4617ea3a | 8921 | check_system_chunk(trans, root, alloc_flags); |
a9629596 | 8922 | unlock_chunks(root->fs_info->chunk_root); |
2f081088 | 8923 | } |
1bbc621e | 8924 | mutex_unlock(&root->fs_info->ro_block_group_mutex); |
2f081088 | 8925 | |
f0486c68 YZ |
8926 | btrfs_end_transaction(trans, root); |
8927 | return ret; | |
8928 | } | |
5d4f98a2 | 8929 | |
c87f08ca CM |
8930 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
8931 | struct btrfs_root *root, u64 type) | |
8932 | { | |
8933 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 8934 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 8935 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
8936 | } |
8937 | ||
6d07bcec MX |
8938 | /* |
8939 | * helper to account the unused space of all the readonly block group in the | |
633c0aad | 8940 | * space_info. takes mirrors into account. |
6d07bcec | 8941 | */ |
633c0aad | 8942 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
6d07bcec MX |
8943 | { |
8944 | struct btrfs_block_group_cache *block_group; | |
8945 | u64 free_bytes = 0; | |
8946 | int factor; | |
8947 | ||
633c0aad JB |
8948 | /* It's df, we don't care if it's racey */ |
8949 | if (list_empty(&sinfo->ro_bgs)) | |
8950 | return 0; | |
8951 | ||
8952 | spin_lock(&sinfo->lock); | |
8953 | list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { | |
6d07bcec MX |
8954 | spin_lock(&block_group->lock); |
8955 | ||
8956 | if (!block_group->ro) { | |
8957 | spin_unlock(&block_group->lock); | |
8958 | continue; | |
8959 | } | |
8960 | ||
8961 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
8962 | BTRFS_BLOCK_GROUP_RAID10 | | |
8963 | BTRFS_BLOCK_GROUP_DUP)) | |
8964 | factor = 2; | |
8965 | else | |
8966 | factor = 1; | |
8967 | ||
8968 | free_bytes += (block_group->key.offset - | |
8969 | btrfs_block_group_used(&block_group->item)) * | |
8970 | factor; | |
8971 | ||
8972 | spin_unlock(&block_group->lock); | |
8973 | } | |
6d07bcec MX |
8974 | spin_unlock(&sinfo->lock); |
8975 | ||
8976 | return free_bytes; | |
8977 | } | |
8978 | ||
868f401a | 8979 | void btrfs_dec_block_group_ro(struct btrfs_root *root, |
f0486c68 | 8980 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 8981 | { |
f0486c68 YZ |
8982 | struct btrfs_space_info *sinfo = cache->space_info; |
8983 | u64 num_bytes; | |
8984 | ||
8985 | BUG_ON(!cache->ro); | |
8986 | ||
8987 | spin_lock(&sinfo->lock); | |
8988 | spin_lock(&cache->lock); | |
868f401a Z |
8989 | if (!--cache->ro) { |
8990 | num_bytes = cache->key.offset - cache->reserved - | |
8991 | cache->pinned - cache->bytes_super - | |
8992 | btrfs_block_group_used(&cache->item); | |
8993 | sinfo->bytes_readonly -= num_bytes; | |
8994 | list_del_init(&cache->ro_list); | |
8995 | } | |
f0486c68 YZ |
8996 | spin_unlock(&cache->lock); |
8997 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
8998 | } |
8999 | ||
ba1bf481 JB |
9000 | /* |
9001 | * checks to see if its even possible to relocate this block group. | |
9002 | * | |
9003 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
9004 | * ok to go ahead and try. | |
9005 | */ | |
9006 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 9007 | { |
ba1bf481 JB |
9008 | struct btrfs_block_group_cache *block_group; |
9009 | struct btrfs_space_info *space_info; | |
9010 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
9011 | struct btrfs_device *device; | |
6df9a95e | 9012 | struct btrfs_trans_handle *trans; |
cdcb725c | 9013 | u64 min_free; |
6719db6a JB |
9014 | u64 dev_min = 1; |
9015 | u64 dev_nr = 0; | |
4a5e98f5 | 9016 | u64 target; |
cdcb725c | 9017 | int index; |
ba1bf481 JB |
9018 | int full = 0; |
9019 | int ret = 0; | |
1a40e23b | 9020 | |
ba1bf481 | 9021 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 9022 | |
ba1bf481 JB |
9023 | /* odd, couldn't find the block group, leave it alone */ |
9024 | if (!block_group) | |
9025 | return -1; | |
1a40e23b | 9026 | |
cdcb725c | 9027 | min_free = btrfs_block_group_used(&block_group->item); |
9028 | ||
ba1bf481 | 9029 | /* no bytes used, we're good */ |
cdcb725c | 9030 | if (!min_free) |
1a40e23b ZY |
9031 | goto out; |
9032 | ||
ba1bf481 JB |
9033 | space_info = block_group->space_info; |
9034 | spin_lock(&space_info->lock); | |
17d217fe | 9035 | |
ba1bf481 | 9036 | full = space_info->full; |
17d217fe | 9037 | |
ba1bf481 JB |
9038 | /* |
9039 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
9040 | * relocate it unless we're able to allocate a new chunk below. |
9041 | * | |
9042 | * Otherwise, we need to make sure we have room in the space to handle | |
9043 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 9044 | */ |
7ce618db | 9045 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 9046 | (space_info->bytes_used + space_info->bytes_reserved + |
9047 | space_info->bytes_pinned + space_info->bytes_readonly + | |
9048 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
9049 | spin_unlock(&space_info->lock); |
9050 | goto out; | |
17d217fe | 9051 | } |
ba1bf481 | 9052 | spin_unlock(&space_info->lock); |
ea8c2819 | 9053 | |
ba1bf481 JB |
9054 | /* |
9055 | * ok we don't have enough space, but maybe we have free space on our | |
9056 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
9057 | * alloc devices and guess if we have enough space. if this block |
9058 | * group is going to be restriped, run checks against the target | |
9059 | * profile instead of the current one. | |
ba1bf481 JB |
9060 | */ |
9061 | ret = -1; | |
ea8c2819 | 9062 | |
cdcb725c | 9063 | /* |
9064 | * index: | |
9065 | * 0: raid10 | |
9066 | * 1: raid1 | |
9067 | * 2: dup | |
9068 | * 3: raid0 | |
9069 | * 4: single | |
9070 | */ | |
4a5e98f5 ID |
9071 | target = get_restripe_target(root->fs_info, block_group->flags); |
9072 | if (target) { | |
31e50229 | 9073 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
9074 | } else { |
9075 | /* | |
9076 | * this is just a balance, so if we were marked as full | |
9077 | * we know there is no space for a new chunk | |
9078 | */ | |
9079 | if (full) | |
9080 | goto out; | |
9081 | ||
9082 | index = get_block_group_index(block_group); | |
9083 | } | |
9084 | ||
e6ec716f | 9085 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 9086 | dev_min = 4; |
6719db6a JB |
9087 | /* Divide by 2 */ |
9088 | min_free >>= 1; | |
e6ec716f | 9089 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 9090 | dev_min = 2; |
e6ec716f | 9091 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
9092 | /* Multiply by 2 */ |
9093 | min_free <<= 1; | |
e6ec716f | 9094 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 9095 | dev_min = fs_devices->rw_devices; |
47c5713f | 9096 | min_free = div64_u64(min_free, dev_min); |
cdcb725c | 9097 | } |
9098 | ||
6df9a95e JB |
9099 | /* We need to do this so that we can look at pending chunks */ |
9100 | trans = btrfs_join_transaction(root); | |
9101 | if (IS_ERR(trans)) { | |
9102 | ret = PTR_ERR(trans); | |
9103 | goto out; | |
9104 | } | |
9105 | ||
ba1bf481 JB |
9106 | mutex_lock(&root->fs_info->chunk_mutex); |
9107 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 9108 | u64 dev_offset; |
56bec294 | 9109 | |
ba1bf481 JB |
9110 | /* |
9111 | * check to make sure we can actually find a chunk with enough | |
9112 | * space to fit our block group in. | |
9113 | */ | |
63a212ab SB |
9114 | if (device->total_bytes > device->bytes_used + min_free && |
9115 | !device->is_tgtdev_for_dev_replace) { | |
6df9a95e | 9116 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 9117 | &dev_offset, NULL); |
ba1bf481 | 9118 | if (!ret) |
cdcb725c | 9119 | dev_nr++; |
9120 | ||
9121 | if (dev_nr >= dev_min) | |
73e48b27 | 9122 | break; |
cdcb725c | 9123 | |
ba1bf481 | 9124 | ret = -1; |
725c8463 | 9125 | } |
edbd8d4e | 9126 | } |
ba1bf481 | 9127 | mutex_unlock(&root->fs_info->chunk_mutex); |
6df9a95e | 9128 | btrfs_end_transaction(trans, root); |
edbd8d4e | 9129 | out: |
ba1bf481 | 9130 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
9131 | return ret; |
9132 | } | |
9133 | ||
b2950863 CH |
9134 | static int find_first_block_group(struct btrfs_root *root, |
9135 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 9136 | { |
925baedd | 9137 | int ret = 0; |
0b86a832 CM |
9138 | struct btrfs_key found_key; |
9139 | struct extent_buffer *leaf; | |
9140 | int slot; | |
edbd8d4e | 9141 | |
0b86a832 CM |
9142 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
9143 | if (ret < 0) | |
925baedd CM |
9144 | goto out; |
9145 | ||
d397712b | 9146 | while (1) { |
0b86a832 | 9147 | slot = path->slots[0]; |
edbd8d4e | 9148 | leaf = path->nodes[0]; |
0b86a832 CM |
9149 | if (slot >= btrfs_header_nritems(leaf)) { |
9150 | ret = btrfs_next_leaf(root, path); | |
9151 | if (ret == 0) | |
9152 | continue; | |
9153 | if (ret < 0) | |
925baedd | 9154 | goto out; |
0b86a832 | 9155 | break; |
edbd8d4e | 9156 | } |
0b86a832 | 9157 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 9158 | |
0b86a832 | 9159 | if (found_key.objectid >= key->objectid && |
925baedd CM |
9160 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
9161 | ret = 0; | |
9162 | goto out; | |
9163 | } | |
0b86a832 | 9164 | path->slots[0]++; |
edbd8d4e | 9165 | } |
925baedd | 9166 | out: |
0b86a832 | 9167 | return ret; |
edbd8d4e CM |
9168 | } |
9169 | ||
0af3d00b JB |
9170 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
9171 | { | |
9172 | struct btrfs_block_group_cache *block_group; | |
9173 | u64 last = 0; | |
9174 | ||
9175 | while (1) { | |
9176 | struct inode *inode; | |
9177 | ||
9178 | block_group = btrfs_lookup_first_block_group(info, last); | |
9179 | while (block_group) { | |
9180 | spin_lock(&block_group->lock); | |
9181 | if (block_group->iref) | |
9182 | break; | |
9183 | spin_unlock(&block_group->lock); | |
9184 | block_group = next_block_group(info->tree_root, | |
9185 | block_group); | |
9186 | } | |
9187 | if (!block_group) { | |
9188 | if (last == 0) | |
9189 | break; | |
9190 | last = 0; | |
9191 | continue; | |
9192 | } | |
9193 | ||
9194 | inode = block_group->inode; | |
9195 | block_group->iref = 0; | |
9196 | block_group->inode = NULL; | |
9197 | spin_unlock(&block_group->lock); | |
9198 | iput(inode); | |
9199 | last = block_group->key.objectid + block_group->key.offset; | |
9200 | btrfs_put_block_group(block_group); | |
9201 | } | |
9202 | } | |
9203 | ||
1a40e23b ZY |
9204 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9205 | { | |
9206 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 9207 | struct btrfs_space_info *space_info; |
11833d66 | 9208 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
9209 | struct rb_node *n; |
9210 | ||
9e351cc8 | 9211 | down_write(&info->commit_root_sem); |
11833d66 YZ |
9212 | while (!list_empty(&info->caching_block_groups)) { |
9213 | caching_ctl = list_entry(info->caching_block_groups.next, | |
9214 | struct btrfs_caching_control, list); | |
9215 | list_del(&caching_ctl->list); | |
9216 | put_caching_control(caching_ctl); | |
9217 | } | |
9e351cc8 | 9218 | up_write(&info->commit_root_sem); |
11833d66 | 9219 | |
47ab2a6c JB |
9220 | spin_lock(&info->unused_bgs_lock); |
9221 | while (!list_empty(&info->unused_bgs)) { | |
9222 | block_group = list_first_entry(&info->unused_bgs, | |
9223 | struct btrfs_block_group_cache, | |
9224 | bg_list); | |
9225 | list_del_init(&block_group->bg_list); | |
9226 | btrfs_put_block_group(block_group); | |
9227 | } | |
9228 | spin_unlock(&info->unused_bgs_lock); | |
9229 | ||
1a40e23b ZY |
9230 | spin_lock(&info->block_group_cache_lock); |
9231 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
9232 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
9233 | cache_node); | |
1a40e23b ZY |
9234 | rb_erase(&block_group->cache_node, |
9235 | &info->block_group_cache_tree); | |
01eacb27 | 9236 | RB_CLEAR_NODE(&block_group->cache_node); |
d899e052 YZ |
9237 | spin_unlock(&info->block_group_cache_lock); |
9238 | ||
80eb234a | 9239 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 9240 | list_del(&block_group->list); |
80eb234a | 9241 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 9242 | |
817d52f8 | 9243 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 9244 | wait_block_group_cache_done(block_group); |
817d52f8 | 9245 | |
3c14874a JB |
9246 | /* |
9247 | * We haven't cached this block group, which means we could | |
9248 | * possibly have excluded extents on this block group. | |
9249 | */ | |
36cce922 JB |
9250 | if (block_group->cached == BTRFS_CACHE_NO || |
9251 | block_group->cached == BTRFS_CACHE_ERROR) | |
3c14874a JB |
9252 | free_excluded_extents(info->extent_root, block_group); |
9253 | ||
817d52f8 | 9254 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 9255 | btrfs_put_block_group(block_group); |
d899e052 YZ |
9256 | |
9257 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
9258 | } |
9259 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
9260 | |
9261 | /* now that all the block groups are freed, go through and | |
9262 | * free all the space_info structs. This is only called during | |
9263 | * the final stages of unmount, and so we know nobody is | |
9264 | * using them. We call synchronize_rcu() once before we start, | |
9265 | * just to be on the safe side. | |
9266 | */ | |
9267 | synchronize_rcu(); | |
9268 | ||
8929ecfa YZ |
9269 | release_global_block_rsv(info); |
9270 | ||
67871254 | 9271 | while (!list_empty(&info->space_info)) { |
6ab0a202 JM |
9272 | int i; |
9273 | ||
4184ea7f CM |
9274 | space_info = list_entry(info->space_info.next, |
9275 | struct btrfs_space_info, | |
9276 | list); | |
b069e0c3 | 9277 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
fae7f21c | 9278 | if (WARN_ON(space_info->bytes_pinned > 0 || |
b069e0c3 | 9279 | space_info->bytes_reserved > 0 || |
fae7f21c | 9280 | space_info->bytes_may_use > 0)) { |
b069e0c3 DS |
9281 | dump_space_info(space_info, 0, 0); |
9282 | } | |
f0486c68 | 9283 | } |
4184ea7f | 9284 | list_del(&space_info->list); |
6ab0a202 JM |
9285 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
9286 | struct kobject *kobj; | |
c1895442 JM |
9287 | kobj = space_info->block_group_kobjs[i]; |
9288 | space_info->block_group_kobjs[i] = NULL; | |
9289 | if (kobj) { | |
6ab0a202 JM |
9290 | kobject_del(kobj); |
9291 | kobject_put(kobj); | |
9292 | } | |
9293 | } | |
9294 | kobject_del(&space_info->kobj); | |
9295 | kobject_put(&space_info->kobj); | |
4184ea7f | 9296 | } |
1a40e23b ZY |
9297 | return 0; |
9298 | } | |
9299 | ||
b742bb82 YZ |
9300 | static void __link_block_group(struct btrfs_space_info *space_info, |
9301 | struct btrfs_block_group_cache *cache) | |
9302 | { | |
9303 | int index = get_block_group_index(cache); | |
ed55b6ac | 9304 | bool first = false; |
b742bb82 YZ |
9305 | |
9306 | down_write(&space_info->groups_sem); | |
ed55b6ac JM |
9307 | if (list_empty(&space_info->block_groups[index])) |
9308 | first = true; | |
9309 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
9310 | up_write(&space_info->groups_sem); | |
9311 | ||
9312 | if (first) { | |
c1895442 | 9313 | struct raid_kobject *rkobj; |
6ab0a202 JM |
9314 | int ret; |
9315 | ||
c1895442 JM |
9316 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); |
9317 | if (!rkobj) | |
9318 | goto out_err; | |
9319 | rkobj->raid_type = index; | |
9320 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
9321 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, | |
9322 | "%s", get_raid_name(index)); | |
6ab0a202 | 9323 | if (ret) { |
c1895442 JM |
9324 | kobject_put(&rkobj->kobj); |
9325 | goto out_err; | |
6ab0a202 | 9326 | } |
c1895442 | 9327 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
6ab0a202 | 9328 | } |
c1895442 JM |
9329 | |
9330 | return; | |
9331 | out_err: | |
9332 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); | |
b742bb82 YZ |
9333 | } |
9334 | ||
920e4a58 MX |
9335 | static struct btrfs_block_group_cache * |
9336 | btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) | |
9337 | { | |
9338 | struct btrfs_block_group_cache *cache; | |
9339 | ||
9340 | cache = kzalloc(sizeof(*cache), GFP_NOFS); | |
9341 | if (!cache) | |
9342 | return NULL; | |
9343 | ||
9344 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), | |
9345 | GFP_NOFS); | |
9346 | if (!cache->free_space_ctl) { | |
9347 | kfree(cache); | |
9348 | return NULL; | |
9349 | } | |
9350 | ||
9351 | cache->key.objectid = start; | |
9352 | cache->key.offset = size; | |
9353 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
9354 | ||
9355 | cache->sectorsize = root->sectorsize; | |
9356 | cache->fs_info = root->fs_info; | |
9357 | cache->full_stripe_len = btrfs_full_stripe_len(root, | |
9358 | &root->fs_info->mapping_tree, | |
9359 | start); | |
9360 | atomic_set(&cache->count, 1); | |
9361 | spin_lock_init(&cache->lock); | |
e570fd27 | 9362 | init_rwsem(&cache->data_rwsem); |
920e4a58 MX |
9363 | INIT_LIST_HEAD(&cache->list); |
9364 | INIT_LIST_HEAD(&cache->cluster_list); | |
47ab2a6c | 9365 | INIT_LIST_HEAD(&cache->bg_list); |
633c0aad | 9366 | INIT_LIST_HEAD(&cache->ro_list); |
ce93ec54 | 9367 | INIT_LIST_HEAD(&cache->dirty_list); |
c9dc4c65 | 9368 | INIT_LIST_HEAD(&cache->io_list); |
920e4a58 | 9369 | btrfs_init_free_space_ctl(cache); |
04216820 | 9370 | atomic_set(&cache->trimming, 0); |
920e4a58 MX |
9371 | |
9372 | return cache; | |
9373 | } | |
9374 | ||
9078a3e1 CM |
9375 | int btrfs_read_block_groups(struct btrfs_root *root) |
9376 | { | |
9377 | struct btrfs_path *path; | |
9378 | int ret; | |
9078a3e1 | 9379 | struct btrfs_block_group_cache *cache; |
be744175 | 9380 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 9381 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
9382 | struct btrfs_key key; |
9383 | struct btrfs_key found_key; | |
5f39d397 | 9384 | struct extent_buffer *leaf; |
0af3d00b JB |
9385 | int need_clear = 0; |
9386 | u64 cache_gen; | |
96b5179d | 9387 | |
be744175 | 9388 | root = info->extent_root; |
9078a3e1 | 9389 | key.objectid = 0; |
0b86a832 | 9390 | key.offset = 0; |
962a298f | 9391 | key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
9078a3e1 CM |
9392 | path = btrfs_alloc_path(); |
9393 | if (!path) | |
9394 | return -ENOMEM; | |
026fd317 | 9395 | path->reada = 1; |
9078a3e1 | 9396 | |
6c41761f | 9397 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 9398 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 9399 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 9400 | need_clear = 1; |
88c2ba3b JB |
9401 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
9402 | need_clear = 1; | |
0af3d00b | 9403 | |
d397712b | 9404 | while (1) { |
0b86a832 | 9405 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
9406 | if (ret > 0) |
9407 | break; | |
0b86a832 CM |
9408 | if (ret != 0) |
9409 | goto error; | |
920e4a58 | 9410 | |
5f39d397 CM |
9411 | leaf = path->nodes[0]; |
9412 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
920e4a58 MX |
9413 | |
9414 | cache = btrfs_create_block_group_cache(root, found_key.objectid, | |
9415 | found_key.offset); | |
9078a3e1 | 9416 | if (!cache) { |
0b86a832 | 9417 | ret = -ENOMEM; |
f0486c68 | 9418 | goto error; |
9078a3e1 | 9419 | } |
96303081 | 9420 | |
cf7c1ef6 LB |
9421 | if (need_clear) { |
9422 | /* | |
9423 | * When we mount with old space cache, we need to | |
9424 | * set BTRFS_DC_CLEAR and set dirty flag. | |
9425 | * | |
9426 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
9427 | * truncate the old free space cache inode and | |
9428 | * setup a new one. | |
9429 | * b) Setting 'dirty flag' makes sure that we flush | |
9430 | * the new space cache info onto disk. | |
9431 | */ | |
cf7c1ef6 | 9432 | if (btrfs_test_opt(root, SPACE_CACHE)) |
ce93ec54 | 9433 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 | 9434 | } |
0af3d00b | 9435 | |
5f39d397 CM |
9436 | read_extent_buffer(leaf, &cache->item, |
9437 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
9438 | sizeof(cache->item)); | |
920e4a58 | 9439 | cache->flags = btrfs_block_group_flags(&cache->item); |
0b86a832 | 9440 | |
9078a3e1 | 9441 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 9442 | btrfs_release_path(path); |
34d52cb6 | 9443 | |
3c14874a JB |
9444 | /* |
9445 | * We need to exclude the super stripes now so that the space | |
9446 | * info has super bytes accounted for, otherwise we'll think | |
9447 | * we have more space than we actually do. | |
9448 | */ | |
835d974f JB |
9449 | ret = exclude_super_stripes(root, cache); |
9450 | if (ret) { | |
9451 | /* | |
9452 | * We may have excluded something, so call this just in | |
9453 | * case. | |
9454 | */ | |
9455 | free_excluded_extents(root, cache); | |
920e4a58 | 9456 | btrfs_put_block_group(cache); |
835d974f JB |
9457 | goto error; |
9458 | } | |
3c14874a | 9459 | |
817d52f8 JB |
9460 | /* |
9461 | * check for two cases, either we are full, and therefore | |
9462 | * don't need to bother with the caching work since we won't | |
9463 | * find any space, or we are empty, and we can just add all | |
9464 | * the space in and be done with it. This saves us _alot_ of | |
9465 | * time, particularly in the full case. | |
9466 | */ | |
9467 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 9468 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 9469 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 9470 | free_excluded_extents(root, cache); |
817d52f8 | 9471 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 9472 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
9473 | cache->cached = BTRFS_CACHE_FINISHED; |
9474 | add_new_free_space(cache, root->fs_info, | |
9475 | found_key.objectid, | |
9476 | found_key.objectid + | |
9477 | found_key.offset); | |
11833d66 | 9478 | free_excluded_extents(root, cache); |
817d52f8 | 9479 | } |
96b5179d | 9480 | |
8c579fe7 JB |
9481 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
9482 | if (ret) { | |
9483 | btrfs_remove_free_space_cache(cache); | |
9484 | btrfs_put_block_group(cache); | |
9485 | goto error; | |
9486 | } | |
9487 | ||
6324fbf3 CM |
9488 | ret = update_space_info(info, cache->flags, found_key.offset, |
9489 | btrfs_block_group_used(&cache->item), | |
9490 | &space_info); | |
8c579fe7 JB |
9491 | if (ret) { |
9492 | btrfs_remove_free_space_cache(cache); | |
9493 | spin_lock(&info->block_group_cache_lock); | |
9494 | rb_erase(&cache->cache_node, | |
9495 | &info->block_group_cache_tree); | |
01eacb27 | 9496 | RB_CLEAR_NODE(&cache->cache_node); |
8c579fe7 JB |
9497 | spin_unlock(&info->block_group_cache_lock); |
9498 | btrfs_put_block_group(cache); | |
9499 | goto error; | |
9500 | } | |
9501 | ||
6324fbf3 | 9502 | cache->space_info = space_info; |
1b2da372 | 9503 | spin_lock(&cache->space_info->lock); |
f0486c68 | 9504 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
9505 | spin_unlock(&cache->space_info->lock); |
9506 | ||
b742bb82 | 9507 | __link_block_group(space_info, cache); |
0f9dd46c | 9508 | |
75ccf47d | 9509 | set_avail_alloc_bits(root->fs_info, cache->flags); |
47ab2a6c | 9510 | if (btrfs_chunk_readonly(root, cache->key.objectid)) { |
868f401a | 9511 | inc_block_group_ro(cache, 1); |
47ab2a6c JB |
9512 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
9513 | spin_lock(&info->unused_bgs_lock); | |
9514 | /* Should always be true but just in case. */ | |
9515 | if (list_empty(&cache->bg_list)) { | |
9516 | btrfs_get_block_group(cache); | |
9517 | list_add_tail(&cache->bg_list, | |
9518 | &info->unused_bgs); | |
9519 | } | |
9520 | spin_unlock(&info->unused_bgs_lock); | |
9521 | } | |
9078a3e1 | 9522 | } |
b742bb82 YZ |
9523 | |
9524 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
9525 | if (!(get_alloc_profile(root, space_info->flags) & | |
9526 | (BTRFS_BLOCK_GROUP_RAID10 | | |
9527 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
9528 | BTRFS_BLOCK_GROUP_RAID5 | |
9529 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
9530 | BTRFS_BLOCK_GROUP_DUP))) |
9531 | continue; | |
9532 | /* | |
9533 | * avoid allocating from un-mirrored block group if there are | |
9534 | * mirrored block groups. | |
9535 | */ | |
1095cc0d | 9536 | list_for_each_entry(cache, |
9537 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
9538 | list) | |
868f401a | 9539 | inc_block_group_ro(cache, 1); |
1095cc0d | 9540 | list_for_each_entry(cache, |
9541 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
9542 | list) | |
868f401a | 9543 | inc_block_group_ro(cache, 1); |
9078a3e1 | 9544 | } |
f0486c68 YZ |
9545 | |
9546 | init_global_block_rsv(info); | |
0b86a832 CM |
9547 | ret = 0; |
9548 | error: | |
9078a3e1 | 9549 | btrfs_free_path(path); |
0b86a832 | 9550 | return ret; |
9078a3e1 | 9551 | } |
6324fbf3 | 9552 | |
ea658bad JB |
9553 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
9554 | struct btrfs_root *root) | |
9555 | { | |
9556 | struct btrfs_block_group_cache *block_group, *tmp; | |
9557 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
9558 | struct btrfs_block_group_item item; | |
9559 | struct btrfs_key key; | |
9560 | int ret = 0; | |
d9a0540a | 9561 | bool can_flush_pending_bgs = trans->can_flush_pending_bgs; |
ea658bad | 9562 | |
d9a0540a | 9563 | trans->can_flush_pending_bgs = false; |
47ab2a6c | 9564 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) { |
ea658bad | 9565 | if (ret) |
c92f6be3 | 9566 | goto next; |
ea658bad JB |
9567 | |
9568 | spin_lock(&block_group->lock); | |
9569 | memcpy(&item, &block_group->item, sizeof(item)); | |
9570 | memcpy(&key, &block_group->key, sizeof(key)); | |
9571 | spin_unlock(&block_group->lock); | |
9572 | ||
9573 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
9574 | sizeof(item)); | |
9575 | if (ret) | |
9576 | btrfs_abort_transaction(trans, extent_root, ret); | |
6df9a95e JB |
9577 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
9578 | key.objectid, key.offset); | |
9579 | if (ret) | |
9580 | btrfs_abort_transaction(trans, extent_root, ret); | |
c92f6be3 FM |
9581 | next: |
9582 | list_del_init(&block_group->bg_list); | |
ea658bad | 9583 | } |
d9a0540a | 9584 | trans->can_flush_pending_bgs = can_flush_pending_bgs; |
ea658bad JB |
9585 | } |
9586 | ||
6324fbf3 CM |
9587 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
9588 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 9589 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
9590 | u64 size) |
9591 | { | |
9592 | int ret; | |
6324fbf3 CM |
9593 | struct btrfs_root *extent_root; |
9594 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
9595 | |
9596 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 9597 | |
995946dd | 9598 | btrfs_set_log_full_commit(root->fs_info, trans); |
e02119d5 | 9599 | |
920e4a58 | 9600 | cache = btrfs_create_block_group_cache(root, chunk_offset, size); |
0f9dd46c JB |
9601 | if (!cache) |
9602 | return -ENOMEM; | |
34d52cb6 | 9603 | |
6324fbf3 | 9604 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 | 9605 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
6324fbf3 CM |
9606 | btrfs_set_block_group_flags(&cache->item, type); |
9607 | ||
920e4a58 | 9608 | cache->flags = type; |
11833d66 | 9609 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 9610 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
9611 | ret = exclude_super_stripes(root, cache); |
9612 | if (ret) { | |
9613 | /* | |
9614 | * We may have excluded something, so call this just in | |
9615 | * case. | |
9616 | */ | |
9617 | free_excluded_extents(root, cache); | |
920e4a58 | 9618 | btrfs_put_block_group(cache); |
835d974f JB |
9619 | return ret; |
9620 | } | |
96303081 | 9621 | |
817d52f8 JB |
9622 | add_new_free_space(cache, root->fs_info, chunk_offset, |
9623 | chunk_offset + size); | |
9624 | ||
11833d66 YZ |
9625 | free_excluded_extents(root, cache); |
9626 | ||
2e6e5183 FM |
9627 | /* |
9628 | * Call to ensure the corresponding space_info object is created and | |
9629 | * assigned to our block group, but don't update its counters just yet. | |
9630 | * We want our bg to be added to the rbtree with its ->space_info set. | |
9631 | */ | |
9632 | ret = update_space_info(root->fs_info, cache->flags, 0, 0, | |
9633 | &cache->space_info); | |
9634 | if (ret) { | |
9635 | btrfs_remove_free_space_cache(cache); | |
9636 | btrfs_put_block_group(cache); | |
9637 | return ret; | |
9638 | } | |
9639 | ||
8c579fe7 JB |
9640 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
9641 | if (ret) { | |
9642 | btrfs_remove_free_space_cache(cache); | |
9643 | btrfs_put_block_group(cache); | |
9644 | return ret; | |
9645 | } | |
9646 | ||
2e6e5183 FM |
9647 | /* |
9648 | * Now that our block group has its ->space_info set and is inserted in | |
9649 | * the rbtree, update the space info's counters. | |
9650 | */ | |
6324fbf3 CM |
9651 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
9652 | &cache->space_info); | |
8c579fe7 JB |
9653 | if (ret) { |
9654 | btrfs_remove_free_space_cache(cache); | |
9655 | spin_lock(&root->fs_info->block_group_cache_lock); | |
9656 | rb_erase(&cache->cache_node, | |
9657 | &root->fs_info->block_group_cache_tree); | |
01eacb27 | 9658 | RB_CLEAR_NODE(&cache->cache_node); |
8c579fe7 JB |
9659 | spin_unlock(&root->fs_info->block_group_cache_lock); |
9660 | btrfs_put_block_group(cache); | |
9661 | return ret; | |
9662 | } | |
c7c144db | 9663 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
9664 | |
9665 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 9666 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
9667 | spin_unlock(&cache->space_info->lock); |
9668 | ||
b742bb82 | 9669 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 9670 | |
47ab2a6c | 9671 | list_add_tail(&cache->bg_list, &trans->new_bgs); |
6324fbf3 | 9672 | |
d18a2c44 | 9673 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 9674 | |
6324fbf3 CM |
9675 | return 0; |
9676 | } | |
1a40e23b | 9677 | |
10ea00f5 ID |
9678 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
9679 | { | |
899c81ea ID |
9680 | u64 extra_flags = chunk_to_extended(flags) & |
9681 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 9682 | |
de98ced9 | 9683 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
9684 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
9685 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
9686 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
9687 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
9688 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
9689 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 9690 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
9691 | } |
9692 | ||
1a40e23b | 9693 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
04216820 FM |
9694 | struct btrfs_root *root, u64 group_start, |
9695 | struct extent_map *em) | |
1a40e23b ZY |
9696 | { |
9697 | struct btrfs_path *path; | |
9698 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 9699 | struct btrfs_free_cluster *cluster; |
0af3d00b | 9700 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 9701 | struct btrfs_key key; |
0af3d00b | 9702 | struct inode *inode; |
c1895442 | 9703 | struct kobject *kobj = NULL; |
1a40e23b | 9704 | int ret; |
10ea00f5 | 9705 | int index; |
89a55897 | 9706 | int factor; |
4f69cb98 | 9707 | struct btrfs_caching_control *caching_ctl = NULL; |
04216820 | 9708 | bool remove_em; |
1a40e23b | 9709 | |
1a40e23b ZY |
9710 | root = root->fs_info->extent_root; |
9711 | ||
9712 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
9713 | BUG_ON(!block_group); | |
c146afad | 9714 | BUG_ON(!block_group->ro); |
1a40e23b | 9715 | |
9f7c43c9 | 9716 | /* |
9717 | * Free the reserved super bytes from this block group before | |
9718 | * remove it. | |
9719 | */ | |
9720 | free_excluded_extents(root, block_group); | |
9721 | ||
1a40e23b | 9722 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 9723 | index = get_block_group_index(block_group); |
89a55897 JB |
9724 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
9725 | BTRFS_BLOCK_GROUP_RAID1 | | |
9726 | BTRFS_BLOCK_GROUP_RAID10)) | |
9727 | factor = 2; | |
9728 | else | |
9729 | factor = 1; | |
1a40e23b | 9730 | |
44fb5511 CM |
9731 | /* make sure this block group isn't part of an allocation cluster */ |
9732 | cluster = &root->fs_info->data_alloc_cluster; | |
9733 | spin_lock(&cluster->refill_lock); | |
9734 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
9735 | spin_unlock(&cluster->refill_lock); | |
9736 | ||
9737 | /* | |
9738 | * make sure this block group isn't part of a metadata | |
9739 | * allocation cluster | |
9740 | */ | |
9741 | cluster = &root->fs_info->meta_alloc_cluster; | |
9742 | spin_lock(&cluster->refill_lock); | |
9743 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
9744 | spin_unlock(&cluster->refill_lock); | |
9745 | ||
1a40e23b | 9746 | path = btrfs_alloc_path(); |
d8926bb3 MF |
9747 | if (!path) { |
9748 | ret = -ENOMEM; | |
9749 | goto out; | |
9750 | } | |
1a40e23b | 9751 | |
1bbc621e CM |
9752 | /* |
9753 | * get the inode first so any iput calls done for the io_list | |
9754 | * aren't the final iput (no unlinks allowed now) | |
9755 | */ | |
10b2f34d | 9756 | inode = lookup_free_space_inode(tree_root, block_group, path); |
1bbc621e CM |
9757 | |
9758 | mutex_lock(&trans->transaction->cache_write_mutex); | |
9759 | /* | |
9760 | * make sure our free spache cache IO is done before remove the | |
9761 | * free space inode | |
9762 | */ | |
9763 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
9764 | if (!list_empty(&block_group->io_list)) { | |
9765 | list_del_init(&block_group->io_list); | |
9766 | ||
9767 | WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); | |
9768 | ||
9769 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
9770 | btrfs_wait_cache_io(root, trans, block_group, | |
9771 | &block_group->io_ctl, path, | |
9772 | block_group->key.objectid); | |
9773 | btrfs_put_block_group(block_group); | |
9774 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
9775 | } | |
9776 | ||
9777 | if (!list_empty(&block_group->dirty_list)) { | |
9778 | list_del_init(&block_group->dirty_list); | |
9779 | btrfs_put_block_group(block_group); | |
9780 | } | |
9781 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
9782 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
9783 | ||
0af3d00b | 9784 | if (!IS_ERR(inode)) { |
b532402e | 9785 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
9786 | if (ret) { |
9787 | btrfs_add_delayed_iput(inode); | |
9788 | goto out; | |
9789 | } | |
0af3d00b JB |
9790 | clear_nlink(inode); |
9791 | /* One for the block groups ref */ | |
9792 | spin_lock(&block_group->lock); | |
9793 | if (block_group->iref) { | |
9794 | block_group->iref = 0; | |
9795 | block_group->inode = NULL; | |
9796 | spin_unlock(&block_group->lock); | |
9797 | iput(inode); | |
9798 | } else { | |
9799 | spin_unlock(&block_group->lock); | |
9800 | } | |
9801 | /* One for our lookup ref */ | |
455757c3 | 9802 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
9803 | } |
9804 | ||
9805 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
9806 | key.offset = block_group->key.objectid; | |
9807 | key.type = 0; | |
9808 | ||
9809 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
9810 | if (ret < 0) | |
9811 | goto out; | |
9812 | if (ret > 0) | |
b3b4aa74 | 9813 | btrfs_release_path(path); |
0af3d00b JB |
9814 | if (ret == 0) { |
9815 | ret = btrfs_del_item(trans, tree_root, path); | |
9816 | if (ret) | |
9817 | goto out; | |
b3b4aa74 | 9818 | btrfs_release_path(path); |
0af3d00b JB |
9819 | } |
9820 | ||
3dfdb934 | 9821 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
9822 | rb_erase(&block_group->cache_node, |
9823 | &root->fs_info->block_group_cache_tree); | |
292cbd51 | 9824 | RB_CLEAR_NODE(&block_group->cache_node); |
a1897fdd LB |
9825 | |
9826 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
9827 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 9828 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 9829 | |
80eb234a | 9830 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
9831 | /* |
9832 | * we must use list_del_init so people can check to see if they | |
9833 | * are still on the list after taking the semaphore | |
9834 | */ | |
9835 | list_del_init(&block_group->list); | |
6ab0a202 | 9836 | if (list_empty(&block_group->space_info->block_groups[index])) { |
c1895442 JM |
9837 | kobj = block_group->space_info->block_group_kobjs[index]; |
9838 | block_group->space_info->block_group_kobjs[index] = NULL; | |
10ea00f5 | 9839 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
6ab0a202 | 9840 | } |
80eb234a | 9841 | up_write(&block_group->space_info->groups_sem); |
c1895442 JM |
9842 | if (kobj) { |
9843 | kobject_del(kobj); | |
9844 | kobject_put(kobj); | |
9845 | } | |
1a40e23b | 9846 | |
4f69cb98 FM |
9847 | if (block_group->has_caching_ctl) |
9848 | caching_ctl = get_caching_control(block_group); | |
817d52f8 | 9849 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 9850 | wait_block_group_cache_done(block_group); |
4f69cb98 FM |
9851 | if (block_group->has_caching_ctl) { |
9852 | down_write(&root->fs_info->commit_root_sem); | |
9853 | if (!caching_ctl) { | |
9854 | struct btrfs_caching_control *ctl; | |
9855 | ||
9856 | list_for_each_entry(ctl, | |
9857 | &root->fs_info->caching_block_groups, list) | |
9858 | if (ctl->block_group == block_group) { | |
9859 | caching_ctl = ctl; | |
9860 | atomic_inc(&caching_ctl->count); | |
9861 | break; | |
9862 | } | |
9863 | } | |
9864 | if (caching_ctl) | |
9865 | list_del_init(&caching_ctl->list); | |
9866 | up_write(&root->fs_info->commit_root_sem); | |
9867 | if (caching_ctl) { | |
9868 | /* Once for the caching bgs list and once for us. */ | |
9869 | put_caching_control(caching_ctl); | |
9870 | put_caching_control(caching_ctl); | |
9871 | } | |
9872 | } | |
817d52f8 | 9873 | |
ce93ec54 JB |
9874 | spin_lock(&trans->transaction->dirty_bgs_lock); |
9875 | if (!list_empty(&block_group->dirty_list)) { | |
1bbc621e CM |
9876 | WARN_ON(1); |
9877 | } | |
9878 | if (!list_empty(&block_group->io_list)) { | |
9879 | WARN_ON(1); | |
ce93ec54 JB |
9880 | } |
9881 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
817d52f8 JB |
9882 | btrfs_remove_free_space_cache(block_group); |
9883 | ||
c146afad | 9884 | spin_lock(&block_group->space_info->lock); |
75c68e9f | 9885 | list_del_init(&block_group->ro_list); |
18d018ad ZL |
9886 | |
9887 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
9888 | WARN_ON(block_group->space_info->total_bytes | |
9889 | < block_group->key.offset); | |
9890 | WARN_ON(block_group->space_info->bytes_readonly | |
9891 | < block_group->key.offset); | |
9892 | WARN_ON(block_group->space_info->disk_total | |
9893 | < block_group->key.offset * factor); | |
9894 | } | |
c146afad YZ |
9895 | block_group->space_info->total_bytes -= block_group->key.offset; |
9896 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 9897 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
18d018ad | 9898 | |
c146afad | 9899 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 9900 | |
0af3d00b JB |
9901 | memcpy(&key, &block_group->key, sizeof(key)); |
9902 | ||
04216820 | 9903 | lock_chunks(root); |
495e64f4 FM |
9904 | if (!list_empty(&em->list)) { |
9905 | /* We're in the transaction->pending_chunks list. */ | |
9906 | free_extent_map(em); | |
9907 | } | |
04216820 FM |
9908 | spin_lock(&block_group->lock); |
9909 | block_group->removed = 1; | |
9910 | /* | |
9911 | * At this point trimming can't start on this block group, because we | |
9912 | * removed the block group from the tree fs_info->block_group_cache_tree | |
9913 | * so no one can't find it anymore and even if someone already got this | |
9914 | * block group before we removed it from the rbtree, they have already | |
9915 | * incremented block_group->trimming - if they didn't, they won't find | |
9916 | * any free space entries because we already removed them all when we | |
9917 | * called btrfs_remove_free_space_cache(). | |
9918 | * | |
9919 | * And we must not remove the extent map from the fs_info->mapping_tree | |
9920 | * to prevent the same logical address range and physical device space | |
9921 | * ranges from being reused for a new block group. This is because our | |
9922 | * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is | |
9923 | * completely transactionless, so while it is trimming a range the | |
9924 | * currently running transaction might finish and a new one start, | |
9925 | * allowing for new block groups to be created that can reuse the same | |
9926 | * physical device locations unless we take this special care. | |
e33e17ee JM |
9927 | * |
9928 | * There may also be an implicit trim operation if the file system | |
9929 | * is mounted with -odiscard. The same protections must remain | |
9930 | * in place until the extents have been discarded completely when | |
9931 | * the transaction commit has completed. | |
04216820 FM |
9932 | */ |
9933 | remove_em = (atomic_read(&block_group->trimming) == 0); | |
9934 | /* | |
9935 | * Make sure a trimmer task always sees the em in the pinned_chunks list | |
9936 | * if it sees block_group->removed == 1 (needs to lock block_group->lock | |
9937 | * before checking block_group->removed). | |
9938 | */ | |
9939 | if (!remove_em) { | |
9940 | /* | |
9941 | * Our em might be in trans->transaction->pending_chunks which | |
9942 | * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks), | |
9943 | * and so is the fs_info->pinned_chunks list. | |
9944 | * | |
9945 | * So at this point we must be holding the chunk_mutex to avoid | |
9946 | * any races with chunk allocation (more specifically at | |
9947 | * volumes.c:contains_pending_extent()), to ensure it always | |
9948 | * sees the em, either in the pending_chunks list or in the | |
9949 | * pinned_chunks list. | |
9950 | */ | |
9951 | list_move_tail(&em->list, &root->fs_info->pinned_chunks); | |
9952 | } | |
9953 | spin_unlock(&block_group->lock); | |
04216820 FM |
9954 | |
9955 | if (remove_em) { | |
9956 | struct extent_map_tree *em_tree; | |
9957 | ||
9958 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
9959 | write_lock(&em_tree->lock); | |
8dbcd10f FM |
9960 | /* |
9961 | * The em might be in the pending_chunks list, so make sure the | |
9962 | * chunk mutex is locked, since remove_extent_mapping() will | |
9963 | * delete us from that list. | |
9964 | */ | |
04216820 FM |
9965 | remove_extent_mapping(em_tree, em); |
9966 | write_unlock(&em_tree->lock); | |
9967 | /* once for the tree */ | |
9968 | free_extent_map(em); | |
9969 | } | |
9970 | ||
8dbcd10f FM |
9971 | unlock_chunks(root); |
9972 | ||
fa9c0d79 CM |
9973 | btrfs_put_block_group(block_group); |
9974 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
9975 | |
9976 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
9977 | if (ret > 0) | |
9978 | ret = -EIO; | |
9979 | if (ret < 0) | |
9980 | goto out; | |
9981 | ||
9982 | ret = btrfs_del_item(trans, root, path); | |
9983 | out: | |
9984 | btrfs_free_path(path); | |
9985 | return ret; | |
9986 | } | |
acce952b | 9987 | |
47ab2a6c JB |
9988 | /* |
9989 | * Process the unused_bgs list and remove any that don't have any allocated | |
9990 | * space inside of them. | |
9991 | */ | |
9992 | void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) | |
9993 | { | |
9994 | struct btrfs_block_group_cache *block_group; | |
9995 | struct btrfs_space_info *space_info; | |
9996 | struct btrfs_root *root = fs_info->extent_root; | |
9997 | struct btrfs_trans_handle *trans; | |
9998 | int ret = 0; | |
9999 | ||
10000 | if (!fs_info->open) | |
10001 | return; | |
10002 | ||
10003 | spin_lock(&fs_info->unused_bgs_lock); | |
10004 | while (!list_empty(&fs_info->unused_bgs)) { | |
10005 | u64 start, end; | |
e33e17ee | 10006 | int trimming; |
47ab2a6c JB |
10007 | |
10008 | block_group = list_first_entry(&fs_info->unused_bgs, | |
10009 | struct btrfs_block_group_cache, | |
10010 | bg_list); | |
10011 | space_info = block_group->space_info; | |
10012 | list_del_init(&block_group->bg_list); | |
10013 | if (ret || btrfs_mixed_space_info(space_info)) { | |
10014 | btrfs_put_block_group(block_group); | |
10015 | continue; | |
10016 | } | |
10017 | spin_unlock(&fs_info->unused_bgs_lock); | |
10018 | ||
67c5e7d4 FM |
10019 | mutex_lock(&root->fs_info->delete_unused_bgs_mutex); |
10020 | ||
47ab2a6c JB |
10021 | /* Don't want to race with allocators so take the groups_sem */ |
10022 | down_write(&space_info->groups_sem); | |
10023 | spin_lock(&block_group->lock); | |
10024 | if (block_group->reserved || | |
10025 | btrfs_block_group_used(&block_group->item) || | |
10026 | block_group->ro) { | |
10027 | /* | |
10028 | * We want to bail if we made new allocations or have | |
10029 | * outstanding allocations in this block group. We do | |
10030 | * the ro check in case balance is currently acting on | |
10031 | * this block group. | |
10032 | */ | |
10033 | spin_unlock(&block_group->lock); | |
10034 | up_write(&space_info->groups_sem); | |
10035 | goto next; | |
10036 | } | |
10037 | spin_unlock(&block_group->lock); | |
10038 | ||
10039 | /* We don't want to force the issue, only flip if it's ok. */ | |
868f401a | 10040 | ret = inc_block_group_ro(block_group, 0); |
47ab2a6c JB |
10041 | up_write(&space_info->groups_sem); |
10042 | if (ret < 0) { | |
10043 | ret = 0; | |
10044 | goto next; | |
10045 | } | |
10046 | ||
10047 | /* | |
10048 | * Want to do this before we do anything else so we can recover | |
10049 | * properly if we fail to join the transaction. | |
10050 | */ | |
3d84be79 FL |
10051 | /* 1 for btrfs_orphan_reserve_metadata() */ |
10052 | trans = btrfs_start_transaction(root, 1); | |
47ab2a6c | 10053 | if (IS_ERR(trans)) { |
868f401a | 10054 | btrfs_dec_block_group_ro(root, block_group); |
47ab2a6c JB |
10055 | ret = PTR_ERR(trans); |
10056 | goto next; | |
10057 | } | |
10058 | ||
10059 | /* | |
10060 | * We could have pending pinned extents for this block group, | |
10061 | * just delete them, we don't care about them anymore. | |
10062 | */ | |
10063 | start = block_group->key.objectid; | |
10064 | end = start + block_group->key.offset - 1; | |
d4b450cd FM |
10065 | /* |
10066 | * Hold the unused_bg_unpin_mutex lock to avoid racing with | |
10067 | * btrfs_finish_extent_commit(). If we are at transaction N, | |
10068 | * another task might be running finish_extent_commit() for the | |
10069 | * previous transaction N - 1, and have seen a range belonging | |
10070 | * to the block group in freed_extents[] before we were able to | |
10071 | * clear the whole block group range from freed_extents[]. This | |
10072 | * means that task can lookup for the block group after we | |
10073 | * unpinned it from freed_extents[] and removed it, leading to | |
10074 | * a BUG_ON() at btrfs_unpin_extent_range(). | |
10075 | */ | |
10076 | mutex_lock(&fs_info->unused_bg_unpin_mutex); | |
758eb51e | 10077 | ret = clear_extent_bits(&fs_info->freed_extents[0], start, end, |
47ab2a6c | 10078 | EXTENT_DIRTY, GFP_NOFS); |
758eb51e | 10079 | if (ret) { |
d4b450cd | 10080 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
868f401a | 10081 | btrfs_dec_block_group_ro(root, block_group); |
758eb51e FM |
10082 | goto end_trans; |
10083 | } | |
10084 | ret = clear_extent_bits(&fs_info->freed_extents[1], start, end, | |
47ab2a6c | 10085 | EXTENT_DIRTY, GFP_NOFS); |
758eb51e | 10086 | if (ret) { |
d4b450cd | 10087 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
868f401a | 10088 | btrfs_dec_block_group_ro(root, block_group); |
758eb51e FM |
10089 | goto end_trans; |
10090 | } | |
d4b450cd | 10091 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
47ab2a6c JB |
10092 | |
10093 | /* Reset pinned so btrfs_put_block_group doesn't complain */ | |
c30666d4 ZL |
10094 | spin_lock(&space_info->lock); |
10095 | spin_lock(&block_group->lock); | |
10096 | ||
10097 | space_info->bytes_pinned -= block_group->pinned; | |
10098 | space_info->bytes_readonly += block_group->pinned; | |
10099 | percpu_counter_add(&space_info->total_bytes_pinned, | |
10100 | -block_group->pinned); | |
47ab2a6c JB |
10101 | block_group->pinned = 0; |
10102 | ||
c30666d4 ZL |
10103 | spin_unlock(&block_group->lock); |
10104 | spin_unlock(&space_info->lock); | |
10105 | ||
e33e17ee JM |
10106 | /* DISCARD can flip during remount */ |
10107 | trimming = btrfs_test_opt(root, DISCARD); | |
10108 | ||
10109 | /* Implicit trim during transaction commit. */ | |
10110 | if (trimming) | |
10111 | btrfs_get_block_group_trimming(block_group); | |
10112 | ||
47ab2a6c JB |
10113 | /* |
10114 | * Btrfs_remove_chunk will abort the transaction if things go | |
10115 | * horribly wrong. | |
10116 | */ | |
10117 | ret = btrfs_remove_chunk(trans, root, | |
10118 | block_group->key.objectid); | |
e33e17ee JM |
10119 | |
10120 | if (ret) { | |
10121 | if (trimming) | |
10122 | btrfs_put_block_group_trimming(block_group); | |
10123 | goto end_trans; | |
10124 | } | |
10125 | ||
10126 | /* | |
10127 | * If we're not mounted with -odiscard, we can just forget | |
10128 | * about this block group. Otherwise we'll need to wait | |
10129 | * until transaction commit to do the actual discard. | |
10130 | */ | |
10131 | if (trimming) { | |
10132 | WARN_ON(!list_empty(&block_group->bg_list)); | |
10133 | spin_lock(&trans->transaction->deleted_bgs_lock); | |
10134 | list_move(&block_group->bg_list, | |
10135 | &trans->transaction->deleted_bgs); | |
10136 | spin_unlock(&trans->transaction->deleted_bgs_lock); | |
10137 | btrfs_get_block_group(block_group); | |
10138 | } | |
758eb51e | 10139 | end_trans: |
47ab2a6c JB |
10140 | btrfs_end_transaction(trans, root); |
10141 | next: | |
67c5e7d4 | 10142 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); |
47ab2a6c JB |
10143 | btrfs_put_block_group(block_group); |
10144 | spin_lock(&fs_info->unused_bgs_lock); | |
10145 | } | |
10146 | spin_unlock(&fs_info->unused_bgs_lock); | |
10147 | } | |
10148 | ||
c59021f8 | 10149 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
10150 | { | |
10151 | struct btrfs_space_info *space_info; | |
1aba86d6 | 10152 | struct btrfs_super_block *disk_super; |
10153 | u64 features; | |
10154 | u64 flags; | |
10155 | int mixed = 0; | |
c59021f8 | 10156 | int ret; |
10157 | ||
6c41761f | 10158 | disk_super = fs_info->super_copy; |
1aba86d6 | 10159 | if (!btrfs_super_root(disk_super)) |
10160 | return 1; | |
c59021f8 | 10161 | |
1aba86d6 | 10162 | features = btrfs_super_incompat_flags(disk_super); |
10163 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
10164 | mixed = 1; | |
c59021f8 | 10165 | |
1aba86d6 | 10166 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
10167 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 10168 | if (ret) |
1aba86d6 | 10169 | goto out; |
c59021f8 | 10170 | |
1aba86d6 | 10171 | if (mixed) { |
10172 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
10173 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10174 | } else { | |
10175 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
10176 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10177 | if (ret) | |
10178 | goto out; | |
10179 | ||
10180 | flags = BTRFS_BLOCK_GROUP_DATA; | |
10181 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10182 | } | |
10183 | out: | |
c59021f8 | 10184 | return ret; |
10185 | } | |
10186 | ||
acce952b | 10187 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
10188 | { | |
678886bd | 10189 | return unpin_extent_range(root, start, end, false); |
acce952b | 10190 | } |
10191 | ||
499f377f JM |
10192 | /* |
10193 | * It used to be that old block groups would be left around forever. | |
10194 | * Iterating over them would be enough to trim unused space. Since we | |
10195 | * now automatically remove them, we also need to iterate over unallocated | |
10196 | * space. | |
10197 | * | |
10198 | * We don't want a transaction for this since the discard may take a | |
10199 | * substantial amount of time. We don't require that a transaction be | |
10200 | * running, but we do need to take a running transaction into account | |
10201 | * to ensure that we're not discarding chunks that were released in | |
10202 | * the current transaction. | |
10203 | * | |
10204 | * Holding the chunks lock will prevent other threads from allocating | |
10205 | * or releasing chunks, but it won't prevent a running transaction | |
10206 | * from committing and releasing the memory that the pending chunks | |
10207 | * list head uses. For that, we need to take a reference to the | |
10208 | * transaction. | |
10209 | */ | |
10210 | static int btrfs_trim_free_extents(struct btrfs_device *device, | |
10211 | u64 minlen, u64 *trimmed) | |
10212 | { | |
10213 | u64 start = 0, len = 0; | |
10214 | int ret; | |
10215 | ||
10216 | *trimmed = 0; | |
10217 | ||
10218 | /* Not writeable = nothing to do. */ | |
10219 | if (!device->writeable) | |
10220 | return 0; | |
10221 | ||
10222 | /* No free space = nothing to do. */ | |
10223 | if (device->total_bytes <= device->bytes_used) | |
10224 | return 0; | |
10225 | ||
10226 | ret = 0; | |
10227 | ||
10228 | while (1) { | |
10229 | struct btrfs_fs_info *fs_info = device->dev_root->fs_info; | |
10230 | struct btrfs_transaction *trans; | |
10231 | u64 bytes; | |
10232 | ||
10233 | ret = mutex_lock_interruptible(&fs_info->chunk_mutex); | |
10234 | if (ret) | |
10235 | return ret; | |
10236 | ||
10237 | down_read(&fs_info->commit_root_sem); | |
10238 | ||
10239 | spin_lock(&fs_info->trans_lock); | |
10240 | trans = fs_info->running_transaction; | |
10241 | if (trans) | |
10242 | atomic_inc(&trans->use_count); | |
10243 | spin_unlock(&fs_info->trans_lock); | |
10244 | ||
10245 | ret = find_free_dev_extent_start(trans, device, minlen, start, | |
10246 | &start, &len); | |
10247 | if (trans) | |
10248 | btrfs_put_transaction(trans); | |
10249 | ||
10250 | if (ret) { | |
10251 | up_read(&fs_info->commit_root_sem); | |
10252 | mutex_unlock(&fs_info->chunk_mutex); | |
10253 | if (ret == -ENOSPC) | |
10254 | ret = 0; | |
10255 | break; | |
10256 | } | |
10257 | ||
10258 | ret = btrfs_issue_discard(device->bdev, start, len, &bytes); | |
10259 | up_read(&fs_info->commit_root_sem); | |
10260 | mutex_unlock(&fs_info->chunk_mutex); | |
10261 | ||
10262 | if (ret) | |
10263 | break; | |
10264 | ||
10265 | start += len; | |
10266 | *trimmed += bytes; | |
10267 | ||
10268 | if (fatal_signal_pending(current)) { | |
10269 | ret = -ERESTARTSYS; | |
10270 | break; | |
10271 | } | |
10272 | ||
10273 | cond_resched(); | |
10274 | } | |
10275 | ||
10276 | return ret; | |
10277 | } | |
10278 | ||
f7039b1d LD |
10279 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) |
10280 | { | |
10281 | struct btrfs_fs_info *fs_info = root->fs_info; | |
10282 | struct btrfs_block_group_cache *cache = NULL; | |
499f377f JM |
10283 | struct btrfs_device *device; |
10284 | struct list_head *devices; | |
f7039b1d LD |
10285 | u64 group_trimmed; |
10286 | u64 start; | |
10287 | u64 end; | |
10288 | u64 trimmed = 0; | |
2cac13e4 | 10289 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
10290 | int ret = 0; |
10291 | ||
2cac13e4 LB |
10292 | /* |
10293 | * try to trim all FS space, our block group may start from non-zero. | |
10294 | */ | |
10295 | if (range->len == total_bytes) | |
10296 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
10297 | else | |
10298 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
10299 | |
10300 | while (cache) { | |
10301 | if (cache->key.objectid >= (range->start + range->len)) { | |
10302 | btrfs_put_block_group(cache); | |
10303 | break; | |
10304 | } | |
10305 | ||
10306 | start = max(range->start, cache->key.objectid); | |
10307 | end = min(range->start + range->len, | |
10308 | cache->key.objectid + cache->key.offset); | |
10309 | ||
10310 | if (end - start >= range->minlen) { | |
10311 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 10312 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
10313 | if (ret) { |
10314 | btrfs_put_block_group(cache); | |
10315 | break; | |
10316 | } | |
10317 | ret = wait_block_group_cache_done(cache); | |
10318 | if (ret) { | |
10319 | btrfs_put_block_group(cache); | |
10320 | break; | |
10321 | } | |
f7039b1d LD |
10322 | } |
10323 | ret = btrfs_trim_block_group(cache, | |
10324 | &group_trimmed, | |
10325 | start, | |
10326 | end, | |
10327 | range->minlen); | |
10328 | ||
10329 | trimmed += group_trimmed; | |
10330 | if (ret) { | |
10331 | btrfs_put_block_group(cache); | |
10332 | break; | |
10333 | } | |
10334 | } | |
10335 | ||
10336 | cache = next_block_group(fs_info->tree_root, cache); | |
10337 | } | |
10338 | ||
499f377f JM |
10339 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
10340 | devices = &root->fs_info->fs_devices->alloc_list; | |
10341 | list_for_each_entry(device, devices, dev_alloc_list) { | |
10342 | ret = btrfs_trim_free_extents(device, range->minlen, | |
10343 | &group_trimmed); | |
10344 | if (ret) | |
10345 | break; | |
10346 | ||
10347 | trimmed += group_trimmed; | |
10348 | } | |
10349 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
10350 | ||
f7039b1d LD |
10351 | range->len = trimmed; |
10352 | return ret; | |
10353 | } | |
8257b2dc MX |
10354 | |
10355 | /* | |
9ea24bbe FM |
10356 | * btrfs_{start,end}_write_no_snapshoting() are similar to |
10357 | * mnt_{want,drop}_write(), they are used to prevent some tasks from writing | |
10358 | * data into the page cache through nocow before the subvolume is snapshoted, | |
10359 | * but flush the data into disk after the snapshot creation, or to prevent | |
10360 | * operations while snapshoting is ongoing and that cause the snapshot to be | |
10361 | * inconsistent (writes followed by expanding truncates for example). | |
8257b2dc | 10362 | */ |
9ea24bbe | 10363 | void btrfs_end_write_no_snapshoting(struct btrfs_root *root) |
8257b2dc MX |
10364 | { |
10365 | percpu_counter_dec(&root->subv_writers->counter); | |
10366 | /* | |
a83342aa | 10367 | * Make sure counter is updated before we wake up waiters. |
8257b2dc MX |
10368 | */ |
10369 | smp_mb(); | |
10370 | if (waitqueue_active(&root->subv_writers->wait)) | |
10371 | wake_up(&root->subv_writers->wait); | |
10372 | } | |
10373 | ||
9ea24bbe | 10374 | int btrfs_start_write_no_snapshoting(struct btrfs_root *root) |
8257b2dc | 10375 | { |
ee39b432 | 10376 | if (atomic_read(&root->will_be_snapshoted)) |
8257b2dc MX |
10377 | return 0; |
10378 | ||
10379 | percpu_counter_inc(&root->subv_writers->counter); | |
10380 | /* | |
10381 | * Make sure counter is updated before we check for snapshot creation. | |
10382 | */ | |
10383 | smp_mb(); | |
ee39b432 | 10384 | if (atomic_read(&root->will_be_snapshoted)) { |
9ea24bbe | 10385 | btrfs_end_write_no_snapshoting(root); |
8257b2dc MX |
10386 | return 0; |
10387 | } | |
10388 | return 1; | |
10389 | } |