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> |
4b4e25f2 | 27 | #include "compat.h" |
74493f7a | 28 | #include "hash.h" |
fec577fb CM |
29 | #include "ctree.h" |
30 | #include "disk-io.h" | |
31 | #include "print-tree.h" | |
e089f05c | 32 | #include "transaction.h" |
0b86a832 | 33 | #include "volumes.h" |
53b381b3 | 34 | #include "raid56.h" |
925baedd | 35 | #include "locking.h" |
fa9c0d79 | 36 | #include "free-space-cache.h" |
3fed40cc | 37 | #include "math.h" |
fec577fb | 38 | |
709c0486 AJ |
39 | #undef SCRAMBLE_DELAYED_REFS |
40 | ||
9e622d6b MX |
41 | /* |
42 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
43 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
44 | * if we really need one. | |
45 | * | |
0e4f8f88 CM |
46 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
47 | * if we have very few chunks already allocated. This is | |
48 | * used as part of the clustering code to help make sure | |
49 | * we have a good pool of storage to cluster in, without | |
50 | * filling the FS with empty chunks | |
51 | * | |
9e622d6b MX |
52 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
53 | * | |
0e4f8f88 CM |
54 | */ |
55 | enum { | |
56 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
57 | CHUNK_ALLOC_LIMITED = 1, |
58 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
59 | }; |
60 | ||
fb25e914 JB |
61 | /* |
62 | * Control how reservations are dealt with. | |
63 | * | |
64 | * RESERVE_FREE - freeing a reservation. | |
65 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
66 | * ENOSPC accounting | |
67 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
68 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
69 | */ | |
70 | enum { | |
71 | RESERVE_FREE = 0, | |
72 | RESERVE_ALLOC = 1, | |
73 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
74 | }; | |
75 | ||
c53d613e | 76 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 77 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
78 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
79 | struct btrfs_root *root, | |
80 | u64 bytenr, u64 num_bytes, u64 parent, | |
81 | u64 root_objectid, u64 owner_objectid, | |
82 | u64 owner_offset, int refs_to_drop, | |
83 | struct btrfs_delayed_extent_op *extra_op); | |
84 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
85 | struct extent_buffer *leaf, | |
86 | struct btrfs_extent_item *ei); | |
87 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
88 | struct btrfs_root *root, | |
89 | u64 parent, u64 root_objectid, | |
90 | u64 flags, u64 owner, u64 offset, | |
91 | struct btrfs_key *ins, int ref_mod); | |
92 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
93 | struct btrfs_root *root, | |
94 | u64 parent, u64 root_objectid, | |
95 | u64 flags, struct btrfs_disk_key *key, | |
96 | int level, struct btrfs_key *ins); | |
6a63209f | 97 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
98 | struct btrfs_root *extent_root, u64 flags, |
99 | int force); | |
11833d66 YZ |
100 | static int find_next_key(struct btrfs_path *path, int level, |
101 | struct btrfs_key *key); | |
9ed74f2d JB |
102 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
103 | int dump_block_groups); | |
fb25e914 JB |
104 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
105 | u64 num_bytes, int reserve); | |
5d80366e JB |
106 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
107 | u64 num_bytes); | |
6a63209f | 108 | |
817d52f8 JB |
109 | static noinline int |
110 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
111 | { | |
112 | smp_mb(); | |
113 | return cache->cached == BTRFS_CACHE_FINISHED; | |
114 | } | |
115 | ||
0f9dd46c JB |
116 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
117 | { | |
118 | return (cache->flags & bits) == bits; | |
119 | } | |
120 | ||
62a45b60 | 121 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
122 | { |
123 | atomic_inc(&cache->count); | |
124 | } | |
125 | ||
126 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
127 | { | |
f0486c68 YZ |
128 | if (atomic_dec_and_test(&cache->count)) { |
129 | WARN_ON(cache->pinned > 0); | |
130 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 131 | kfree(cache->free_space_ctl); |
11dfe35a | 132 | kfree(cache); |
f0486c68 | 133 | } |
11dfe35a JB |
134 | } |
135 | ||
0f9dd46c JB |
136 | /* |
137 | * this adds the block group to the fs_info rb tree for the block group | |
138 | * cache | |
139 | */ | |
b2950863 | 140 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
141 | struct btrfs_block_group_cache *block_group) |
142 | { | |
143 | struct rb_node **p; | |
144 | struct rb_node *parent = NULL; | |
145 | struct btrfs_block_group_cache *cache; | |
146 | ||
147 | spin_lock(&info->block_group_cache_lock); | |
148 | p = &info->block_group_cache_tree.rb_node; | |
149 | ||
150 | while (*p) { | |
151 | parent = *p; | |
152 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
153 | cache_node); | |
154 | if (block_group->key.objectid < cache->key.objectid) { | |
155 | p = &(*p)->rb_left; | |
156 | } else if (block_group->key.objectid > cache->key.objectid) { | |
157 | p = &(*p)->rb_right; | |
158 | } else { | |
159 | spin_unlock(&info->block_group_cache_lock); | |
160 | return -EEXIST; | |
161 | } | |
162 | } | |
163 | ||
164 | rb_link_node(&block_group->cache_node, parent, p); | |
165 | rb_insert_color(&block_group->cache_node, | |
166 | &info->block_group_cache_tree); | |
a1897fdd LB |
167 | |
168 | if (info->first_logical_byte > block_group->key.objectid) | |
169 | info->first_logical_byte = block_group->key.objectid; | |
170 | ||
0f9dd46c JB |
171 | spin_unlock(&info->block_group_cache_lock); |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | /* | |
177 | * This will return the block group at or after bytenr if contains is 0, else | |
178 | * it will return the block group that contains the bytenr | |
179 | */ | |
180 | static struct btrfs_block_group_cache * | |
181 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
182 | int contains) | |
183 | { | |
184 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
185 | struct rb_node *n; | |
186 | u64 end, start; | |
187 | ||
188 | spin_lock(&info->block_group_cache_lock); | |
189 | n = info->block_group_cache_tree.rb_node; | |
190 | ||
191 | while (n) { | |
192 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
193 | cache_node); | |
194 | end = cache->key.objectid + cache->key.offset - 1; | |
195 | start = cache->key.objectid; | |
196 | ||
197 | if (bytenr < start) { | |
198 | if (!contains && (!ret || start < ret->key.objectid)) | |
199 | ret = cache; | |
200 | n = n->rb_left; | |
201 | } else if (bytenr > start) { | |
202 | if (contains && bytenr <= end) { | |
203 | ret = cache; | |
204 | break; | |
205 | } | |
206 | n = n->rb_right; | |
207 | } else { | |
208 | ret = cache; | |
209 | break; | |
210 | } | |
211 | } | |
a1897fdd | 212 | if (ret) { |
11dfe35a | 213 | btrfs_get_block_group(ret); |
a1897fdd LB |
214 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
215 | info->first_logical_byte = ret->key.objectid; | |
216 | } | |
0f9dd46c JB |
217 | spin_unlock(&info->block_group_cache_lock); |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
11833d66 YZ |
222 | static int add_excluded_extent(struct btrfs_root *root, |
223 | u64 start, u64 num_bytes) | |
817d52f8 | 224 | { |
11833d66 YZ |
225 | u64 end = start + num_bytes - 1; |
226 | set_extent_bits(&root->fs_info->freed_extents[0], | |
227 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
228 | set_extent_bits(&root->fs_info->freed_extents[1], | |
229 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
230 | return 0; | |
231 | } | |
817d52f8 | 232 | |
11833d66 YZ |
233 | static void free_excluded_extents(struct btrfs_root *root, |
234 | struct btrfs_block_group_cache *cache) | |
235 | { | |
236 | u64 start, end; | |
817d52f8 | 237 | |
11833d66 YZ |
238 | start = cache->key.objectid; |
239 | end = start + cache->key.offset - 1; | |
240 | ||
241 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
242 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
243 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
244 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
245 | } |
246 | ||
11833d66 YZ |
247 | static int exclude_super_stripes(struct btrfs_root *root, |
248 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 249 | { |
817d52f8 JB |
250 | u64 bytenr; |
251 | u64 *logical; | |
252 | int stripe_len; | |
253 | int i, nr, ret; | |
254 | ||
06b2331f YZ |
255 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
256 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
257 | cache->bytes_super += stripe_len; | |
258 | ret = add_excluded_extent(root, cache->key.objectid, | |
259 | stripe_len); | |
835d974f JB |
260 | if (ret) |
261 | return ret; | |
06b2331f YZ |
262 | } |
263 | ||
817d52f8 JB |
264 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
265 | bytenr = btrfs_sb_offset(i); | |
266 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
267 | cache->key.objectid, bytenr, | |
268 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
269 | if (ret) |
270 | return ret; | |
11833d66 | 271 | |
817d52f8 | 272 | while (nr--) { |
51bf5f0b JB |
273 | u64 start, len; |
274 | ||
275 | if (logical[nr] > cache->key.objectid + | |
276 | cache->key.offset) | |
277 | continue; | |
278 | ||
279 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
280 | continue; | |
281 | ||
282 | start = logical[nr]; | |
283 | if (start < cache->key.objectid) { | |
284 | start = cache->key.objectid; | |
285 | len = (logical[nr] + stripe_len) - start; | |
286 | } else { | |
287 | len = min_t(u64, stripe_len, | |
288 | cache->key.objectid + | |
289 | cache->key.offset - start); | |
290 | } | |
291 | ||
292 | cache->bytes_super += len; | |
293 | ret = add_excluded_extent(root, start, len); | |
835d974f JB |
294 | if (ret) { |
295 | kfree(logical); | |
296 | return ret; | |
297 | } | |
817d52f8 | 298 | } |
11833d66 | 299 | |
817d52f8 JB |
300 | kfree(logical); |
301 | } | |
817d52f8 JB |
302 | return 0; |
303 | } | |
304 | ||
11833d66 YZ |
305 | static struct btrfs_caching_control * |
306 | get_caching_control(struct btrfs_block_group_cache *cache) | |
307 | { | |
308 | struct btrfs_caching_control *ctl; | |
309 | ||
310 | spin_lock(&cache->lock); | |
311 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
312 | spin_unlock(&cache->lock); | |
313 | return NULL; | |
314 | } | |
315 | ||
dde5abee JB |
316 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
317 | if (!cache->caching_ctl) { | |
318 | spin_unlock(&cache->lock); | |
11833d66 YZ |
319 | return NULL; |
320 | } | |
321 | ||
322 | ctl = cache->caching_ctl; | |
323 | atomic_inc(&ctl->count); | |
324 | spin_unlock(&cache->lock); | |
325 | return ctl; | |
326 | } | |
327 | ||
328 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
329 | { | |
330 | if (atomic_dec_and_test(&ctl->count)) | |
331 | kfree(ctl); | |
332 | } | |
333 | ||
0f9dd46c JB |
334 | /* |
335 | * this is only called by cache_block_group, since we could have freed extents | |
336 | * we need to check the pinned_extents for any extents that can't be used yet | |
337 | * since their free space will be released as soon as the transaction commits. | |
338 | */ | |
817d52f8 | 339 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
340 | struct btrfs_fs_info *info, u64 start, u64 end) |
341 | { | |
817d52f8 | 342 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
343 | int ret; |
344 | ||
345 | while (start < end) { | |
11833d66 | 346 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 347 | &extent_start, &extent_end, |
e6138876 JB |
348 | EXTENT_DIRTY | EXTENT_UPTODATE, |
349 | NULL); | |
0f9dd46c JB |
350 | if (ret) |
351 | break; | |
352 | ||
06b2331f | 353 | if (extent_start <= start) { |
0f9dd46c JB |
354 | start = extent_end + 1; |
355 | } else if (extent_start > start && extent_start < end) { | |
356 | size = extent_start - start; | |
817d52f8 | 357 | total_added += size; |
ea6a478e JB |
358 | ret = btrfs_add_free_space(block_group, start, |
359 | size); | |
79787eaa | 360 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
361 | start = extent_end + 1; |
362 | } else { | |
363 | break; | |
364 | } | |
365 | } | |
366 | ||
367 | if (start < end) { | |
368 | size = end - start; | |
817d52f8 | 369 | total_added += size; |
ea6a478e | 370 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 371 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
372 | } |
373 | ||
817d52f8 | 374 | return total_added; |
0f9dd46c JB |
375 | } |
376 | ||
bab39bf9 | 377 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 378 | { |
bab39bf9 JB |
379 | struct btrfs_block_group_cache *block_group; |
380 | struct btrfs_fs_info *fs_info; | |
381 | struct btrfs_caching_control *caching_ctl; | |
382 | struct btrfs_root *extent_root; | |
e37c9e69 | 383 | struct btrfs_path *path; |
5f39d397 | 384 | struct extent_buffer *leaf; |
11833d66 | 385 | struct btrfs_key key; |
817d52f8 | 386 | u64 total_found = 0; |
11833d66 YZ |
387 | u64 last = 0; |
388 | u32 nritems; | |
389 | int ret = 0; | |
f510cfec | 390 | |
bab39bf9 JB |
391 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
392 | block_group = caching_ctl->block_group; | |
393 | fs_info = block_group->fs_info; | |
394 | extent_root = fs_info->extent_root; | |
395 | ||
e37c9e69 CM |
396 | path = btrfs_alloc_path(); |
397 | if (!path) | |
bab39bf9 | 398 | goto out; |
7d7d6068 | 399 | |
817d52f8 | 400 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 401 | |
5cd57b2c | 402 | /* |
817d52f8 JB |
403 | * We don't want to deadlock with somebody trying to allocate a new |
404 | * extent for the extent root while also trying to search the extent | |
405 | * root to add free space. So we skip locking and search the commit | |
406 | * root, since its read-only | |
5cd57b2c CM |
407 | */ |
408 | path->skip_locking = 1; | |
817d52f8 | 409 | path->search_commit_root = 1; |
026fd317 | 410 | path->reada = 1; |
817d52f8 | 411 | |
e4404d6e | 412 | key.objectid = last; |
e37c9e69 | 413 | key.offset = 0; |
11833d66 | 414 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 415 | again: |
11833d66 | 416 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
417 | /* need to make sure the commit_root doesn't disappear */ |
418 | down_read(&fs_info->extent_commit_sem); | |
419 | ||
11833d66 | 420 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 421 | if (ret < 0) |
ef8bbdfe | 422 | goto err; |
a512bbf8 | 423 | |
11833d66 YZ |
424 | leaf = path->nodes[0]; |
425 | nritems = btrfs_header_nritems(leaf); | |
426 | ||
d397712b | 427 | while (1) { |
7841cb28 | 428 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 429 | last = (u64)-1; |
817d52f8 | 430 | break; |
f25784b3 | 431 | } |
817d52f8 | 432 | |
11833d66 YZ |
433 | if (path->slots[0] < nritems) { |
434 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
435 | } else { | |
436 | ret = find_next_key(path, 0, &key); | |
437 | if (ret) | |
e37c9e69 | 438 | break; |
817d52f8 | 439 | |
0a3896d0 | 440 | if (need_resched()) { |
589d8ade | 441 | caching_ctl->progress = last; |
ff5714cc | 442 | btrfs_release_path(path); |
589d8ade JB |
443 | up_read(&fs_info->extent_commit_sem); |
444 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 445 | cond_resched(); |
589d8ade JB |
446 | goto again; |
447 | } | |
0a3896d0 JB |
448 | |
449 | ret = btrfs_next_leaf(extent_root, path); | |
450 | if (ret < 0) | |
451 | goto err; | |
452 | if (ret) | |
453 | break; | |
589d8ade JB |
454 | leaf = path->nodes[0]; |
455 | nritems = btrfs_header_nritems(leaf); | |
456 | continue; | |
11833d66 | 457 | } |
817d52f8 | 458 | |
11833d66 YZ |
459 | if (key.objectid < block_group->key.objectid) { |
460 | path->slots[0]++; | |
817d52f8 | 461 | continue; |
e37c9e69 | 462 | } |
0f9dd46c | 463 | |
e37c9e69 | 464 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 465 | block_group->key.offset) |
e37c9e69 | 466 | break; |
7d7d6068 | 467 | |
3173a18f JB |
468 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
469 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
470 | total_found += add_new_free_space(block_group, |
471 | fs_info, last, | |
472 | key.objectid); | |
3173a18f JB |
473 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
474 | last = key.objectid + | |
475 | fs_info->tree_root->leafsize; | |
476 | else | |
477 | last = key.objectid + key.offset; | |
817d52f8 | 478 | |
11833d66 YZ |
479 | if (total_found > (1024 * 1024 * 2)) { |
480 | total_found = 0; | |
481 | wake_up(&caching_ctl->wait); | |
482 | } | |
817d52f8 | 483 | } |
e37c9e69 CM |
484 | path->slots[0]++; |
485 | } | |
817d52f8 | 486 | ret = 0; |
e37c9e69 | 487 | |
817d52f8 JB |
488 | total_found += add_new_free_space(block_group, fs_info, last, |
489 | block_group->key.objectid + | |
490 | block_group->key.offset); | |
11833d66 | 491 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
492 | |
493 | spin_lock(&block_group->lock); | |
11833d66 | 494 | block_group->caching_ctl = NULL; |
817d52f8 JB |
495 | block_group->cached = BTRFS_CACHE_FINISHED; |
496 | spin_unlock(&block_group->lock); | |
0f9dd46c | 497 | |
54aa1f4d | 498 | err: |
e37c9e69 | 499 | btrfs_free_path(path); |
276e680d | 500 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 501 | |
11833d66 YZ |
502 | free_excluded_extents(extent_root, block_group); |
503 | ||
504 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 505 | out: |
11833d66 YZ |
506 | wake_up(&caching_ctl->wait); |
507 | ||
508 | put_caching_control(caching_ctl); | |
11dfe35a | 509 | btrfs_put_block_group(block_group); |
817d52f8 JB |
510 | } |
511 | ||
9d66e233 | 512 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 513 | int load_cache_only) |
817d52f8 | 514 | { |
291c7d2f | 515 | DEFINE_WAIT(wait); |
11833d66 YZ |
516 | struct btrfs_fs_info *fs_info = cache->fs_info; |
517 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
518 | int ret = 0; |
519 | ||
291c7d2f | 520 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
521 | if (!caching_ctl) |
522 | return -ENOMEM; | |
291c7d2f JB |
523 | |
524 | INIT_LIST_HEAD(&caching_ctl->list); | |
525 | mutex_init(&caching_ctl->mutex); | |
526 | init_waitqueue_head(&caching_ctl->wait); | |
527 | caching_ctl->block_group = cache; | |
528 | caching_ctl->progress = cache->key.objectid; | |
529 | atomic_set(&caching_ctl->count, 1); | |
530 | caching_ctl->work.func = caching_thread; | |
531 | ||
532 | spin_lock(&cache->lock); | |
533 | /* | |
534 | * This should be a rare occasion, but this could happen I think in the | |
535 | * case where one thread starts to load the space cache info, and then | |
536 | * some other thread starts a transaction commit which tries to do an | |
537 | * allocation while the other thread is still loading the space cache | |
538 | * info. The previous loop should have kept us from choosing this block | |
539 | * group, but if we've moved to the state where we will wait on caching | |
540 | * block groups we need to first check if we're doing a fast load here, | |
541 | * so we can wait for it to finish, otherwise we could end up allocating | |
542 | * from a block group who's cache gets evicted for one reason or | |
543 | * another. | |
544 | */ | |
545 | while (cache->cached == BTRFS_CACHE_FAST) { | |
546 | struct btrfs_caching_control *ctl; | |
547 | ||
548 | ctl = cache->caching_ctl; | |
549 | atomic_inc(&ctl->count); | |
550 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
551 | spin_unlock(&cache->lock); | |
552 | ||
553 | schedule(); | |
554 | ||
555 | finish_wait(&ctl->wait, &wait); | |
556 | put_caching_control(ctl); | |
557 | spin_lock(&cache->lock); | |
558 | } | |
559 | ||
560 | if (cache->cached != BTRFS_CACHE_NO) { | |
561 | spin_unlock(&cache->lock); | |
562 | kfree(caching_ctl); | |
11833d66 | 563 | return 0; |
291c7d2f JB |
564 | } |
565 | WARN_ON(cache->caching_ctl); | |
566 | cache->caching_ctl = caching_ctl; | |
567 | cache->cached = BTRFS_CACHE_FAST; | |
568 | spin_unlock(&cache->lock); | |
11833d66 | 569 | |
d53ba474 | 570 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
571 | ret = load_free_space_cache(fs_info, cache); |
572 | ||
573 | spin_lock(&cache->lock); | |
574 | if (ret == 1) { | |
291c7d2f | 575 | cache->caching_ctl = NULL; |
9d66e233 JB |
576 | cache->cached = BTRFS_CACHE_FINISHED; |
577 | cache->last_byte_to_unpin = (u64)-1; | |
578 | } else { | |
291c7d2f JB |
579 | if (load_cache_only) { |
580 | cache->caching_ctl = NULL; | |
581 | cache->cached = BTRFS_CACHE_NO; | |
582 | } else { | |
583 | cache->cached = BTRFS_CACHE_STARTED; | |
584 | } | |
9d66e233 JB |
585 | } |
586 | spin_unlock(&cache->lock); | |
291c7d2f | 587 | wake_up(&caching_ctl->wait); |
3c14874a | 588 | if (ret == 1) { |
291c7d2f | 589 | put_caching_control(caching_ctl); |
3c14874a | 590 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 591 | return 0; |
3c14874a | 592 | } |
291c7d2f JB |
593 | } else { |
594 | /* | |
595 | * We are not going to do the fast caching, set cached to the | |
596 | * appropriate value and wakeup any waiters. | |
597 | */ | |
598 | spin_lock(&cache->lock); | |
599 | if (load_cache_only) { | |
600 | cache->caching_ctl = NULL; | |
601 | cache->cached = BTRFS_CACHE_NO; | |
602 | } else { | |
603 | cache->cached = BTRFS_CACHE_STARTED; | |
604 | } | |
605 | spin_unlock(&cache->lock); | |
606 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
607 | } |
608 | ||
291c7d2f JB |
609 | if (load_cache_only) { |
610 | put_caching_control(caching_ctl); | |
11833d66 | 611 | return 0; |
817d52f8 | 612 | } |
817d52f8 | 613 | |
11833d66 | 614 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 615 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
616 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
617 | up_write(&fs_info->extent_commit_sem); | |
618 | ||
11dfe35a | 619 | btrfs_get_block_group(cache); |
11833d66 | 620 | |
bab39bf9 | 621 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 622 | |
ef8bbdfe | 623 | return ret; |
e37c9e69 CM |
624 | } |
625 | ||
0f9dd46c JB |
626 | /* |
627 | * return the block group that starts at or after bytenr | |
628 | */ | |
d397712b CM |
629 | static struct btrfs_block_group_cache * |
630 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 631 | { |
0f9dd46c | 632 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 633 | |
0f9dd46c | 634 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 635 | |
0f9dd46c | 636 | return cache; |
0ef3e66b CM |
637 | } |
638 | ||
0f9dd46c | 639 | /* |
9f55684c | 640 | * return the block group that contains the given bytenr |
0f9dd46c | 641 | */ |
d397712b CM |
642 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
643 | struct btrfs_fs_info *info, | |
644 | u64 bytenr) | |
be744175 | 645 | { |
0f9dd46c | 646 | struct btrfs_block_group_cache *cache; |
be744175 | 647 | |
0f9dd46c | 648 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 649 | |
0f9dd46c | 650 | return cache; |
be744175 | 651 | } |
0b86a832 | 652 | |
0f9dd46c JB |
653 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
654 | u64 flags) | |
6324fbf3 | 655 | { |
0f9dd46c | 656 | struct list_head *head = &info->space_info; |
0f9dd46c | 657 | struct btrfs_space_info *found; |
4184ea7f | 658 | |
52ba6929 | 659 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 660 | |
4184ea7f CM |
661 | rcu_read_lock(); |
662 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 663 | if (found->flags & flags) { |
4184ea7f | 664 | rcu_read_unlock(); |
0f9dd46c | 665 | return found; |
4184ea7f | 666 | } |
0f9dd46c | 667 | } |
4184ea7f | 668 | rcu_read_unlock(); |
0f9dd46c | 669 | return NULL; |
6324fbf3 CM |
670 | } |
671 | ||
4184ea7f CM |
672 | /* |
673 | * after adding space to the filesystem, we need to clear the full flags | |
674 | * on all the space infos. | |
675 | */ | |
676 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
677 | { | |
678 | struct list_head *head = &info->space_info; | |
679 | struct btrfs_space_info *found; | |
680 | ||
681 | rcu_read_lock(); | |
682 | list_for_each_entry_rcu(found, head, list) | |
683 | found->full = 0; | |
684 | rcu_read_unlock(); | |
685 | } | |
686 | ||
d2fb3437 YZ |
687 | u64 btrfs_find_block_group(struct btrfs_root *root, |
688 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 689 | { |
96b5179d | 690 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 691 | u64 used; |
d2fb3437 YZ |
692 | u64 last = max(search_hint, search_start); |
693 | u64 group_start = 0; | |
31f3c99b | 694 | int full_search = 0; |
d2fb3437 | 695 | int factor = 9; |
0ef3e66b | 696 | int wrapped = 0; |
31f3c99b | 697 | again: |
e8569813 ZY |
698 | while (1) { |
699 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
700 | if (!cache) |
701 | break; | |
96b5179d | 702 | |
c286ac48 | 703 | spin_lock(&cache->lock); |
96b5179d CM |
704 | last = cache->key.objectid + cache->key.offset; |
705 | used = btrfs_block_group_used(&cache->item); | |
706 | ||
d2fb3437 YZ |
707 | if ((full_search || !cache->ro) && |
708 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 709 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
710 | div_factor(cache->key.offset, factor)) { |
711 | group_start = cache->key.objectid; | |
c286ac48 | 712 | spin_unlock(&cache->lock); |
fa9c0d79 | 713 | btrfs_put_block_group(cache); |
8790d502 CM |
714 | goto found; |
715 | } | |
6324fbf3 | 716 | } |
c286ac48 | 717 | spin_unlock(&cache->lock); |
fa9c0d79 | 718 | btrfs_put_block_group(cache); |
de428b63 | 719 | cond_resched(); |
cd1bc465 | 720 | } |
0ef3e66b CM |
721 | if (!wrapped) { |
722 | last = search_start; | |
723 | wrapped = 1; | |
724 | goto again; | |
725 | } | |
726 | if (!full_search && factor < 10) { | |
be744175 | 727 | last = search_start; |
31f3c99b | 728 | full_search = 1; |
0ef3e66b | 729 | factor = 10; |
31f3c99b CM |
730 | goto again; |
731 | } | |
be744175 | 732 | found: |
d2fb3437 | 733 | return group_start; |
925baedd | 734 | } |
0f9dd46c | 735 | |
e02119d5 | 736 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 737 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
738 | { |
739 | int ret; | |
740 | struct btrfs_key key; | |
31840ae1 | 741 | struct btrfs_path *path; |
e02119d5 | 742 | |
31840ae1 | 743 | path = btrfs_alloc_path(); |
d8926bb3 MF |
744 | if (!path) |
745 | return -ENOMEM; | |
746 | ||
e02119d5 CM |
747 | key.objectid = start; |
748 | key.offset = len; | |
3173a18f | 749 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
750 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
751 | 0, 0); | |
3173a18f JB |
752 | if (ret > 0) { |
753 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
754 | if (key.objectid == start && | |
755 | key.type == BTRFS_METADATA_ITEM_KEY) | |
756 | ret = 0; | |
757 | } | |
31840ae1 | 758 | btrfs_free_path(path); |
7bb86316 CM |
759 | return ret; |
760 | } | |
761 | ||
a22285a6 | 762 | /* |
3173a18f | 763 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
764 | * |
765 | * the head node for delayed ref is used to store the sum of all the | |
766 | * reference count modifications queued up in the rbtree. the head | |
767 | * node may also store the extent flags to set. This way you can check | |
768 | * to see what the reference count and extent flags would be if all of | |
769 | * the delayed refs are not processed. | |
770 | */ | |
771 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
772 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 773 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
774 | { |
775 | struct btrfs_delayed_ref_head *head; | |
776 | struct btrfs_delayed_ref_root *delayed_refs; | |
777 | struct btrfs_path *path; | |
778 | struct btrfs_extent_item *ei; | |
779 | struct extent_buffer *leaf; | |
780 | struct btrfs_key key; | |
781 | u32 item_size; | |
782 | u64 num_refs; | |
783 | u64 extent_flags; | |
784 | int ret; | |
785 | ||
3173a18f JB |
786 | /* |
787 | * If we don't have skinny metadata, don't bother doing anything | |
788 | * different | |
789 | */ | |
790 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
791 | offset = root->leafsize; | |
792 | metadata = 0; | |
793 | } | |
794 | ||
a22285a6 YZ |
795 | path = btrfs_alloc_path(); |
796 | if (!path) | |
797 | return -ENOMEM; | |
798 | ||
3173a18f JB |
799 | if (metadata) { |
800 | key.objectid = bytenr; | |
801 | key.type = BTRFS_METADATA_ITEM_KEY; | |
802 | key.offset = offset; | |
803 | } else { | |
804 | key.objectid = bytenr; | |
805 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
806 | key.offset = offset; | |
807 | } | |
808 | ||
a22285a6 YZ |
809 | if (!trans) { |
810 | path->skip_locking = 1; | |
811 | path->search_commit_root = 1; | |
812 | } | |
813 | again: | |
814 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
815 | &key, path, 0, 0); | |
816 | if (ret < 0) | |
817 | goto out_free; | |
818 | ||
3173a18f JB |
819 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
820 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
821 | key.offset = root->leafsize; | |
822 | btrfs_release_path(path); | |
823 | goto again; | |
824 | } | |
825 | ||
a22285a6 YZ |
826 | if (ret == 0) { |
827 | leaf = path->nodes[0]; | |
828 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
829 | if (item_size >= sizeof(*ei)) { | |
830 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
831 | struct btrfs_extent_item); | |
832 | num_refs = btrfs_extent_refs(leaf, ei); | |
833 | extent_flags = btrfs_extent_flags(leaf, ei); | |
834 | } else { | |
835 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
836 | struct btrfs_extent_item_v0 *ei0; | |
837 | BUG_ON(item_size != sizeof(*ei0)); | |
838 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
839 | struct btrfs_extent_item_v0); | |
840 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
841 | /* FIXME: this isn't correct for data */ | |
842 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
843 | #else | |
844 | BUG(); | |
845 | #endif | |
846 | } | |
847 | BUG_ON(num_refs == 0); | |
848 | } else { | |
849 | num_refs = 0; | |
850 | extent_flags = 0; | |
851 | ret = 0; | |
852 | } | |
853 | ||
854 | if (!trans) | |
855 | goto out; | |
856 | ||
857 | delayed_refs = &trans->transaction->delayed_refs; | |
858 | spin_lock(&delayed_refs->lock); | |
859 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
860 | if (head) { | |
861 | if (!mutex_trylock(&head->mutex)) { | |
862 | atomic_inc(&head->node.refs); | |
863 | spin_unlock(&delayed_refs->lock); | |
864 | ||
b3b4aa74 | 865 | btrfs_release_path(path); |
a22285a6 | 866 | |
8cc33e5c DS |
867 | /* |
868 | * Mutex was contended, block until it's released and try | |
869 | * again | |
870 | */ | |
a22285a6 YZ |
871 | mutex_lock(&head->mutex); |
872 | mutex_unlock(&head->mutex); | |
873 | btrfs_put_delayed_ref(&head->node); | |
874 | goto again; | |
875 | } | |
876 | if (head->extent_op && head->extent_op->update_flags) | |
877 | extent_flags |= head->extent_op->flags_to_set; | |
878 | else | |
879 | BUG_ON(num_refs == 0); | |
880 | ||
881 | num_refs += head->node.ref_mod; | |
882 | mutex_unlock(&head->mutex); | |
883 | } | |
884 | spin_unlock(&delayed_refs->lock); | |
885 | out: | |
886 | WARN_ON(num_refs == 0); | |
887 | if (refs) | |
888 | *refs = num_refs; | |
889 | if (flags) | |
890 | *flags = extent_flags; | |
891 | out_free: | |
892 | btrfs_free_path(path); | |
893 | return ret; | |
894 | } | |
895 | ||
d8d5f3e1 CM |
896 | /* |
897 | * Back reference rules. Back refs have three main goals: | |
898 | * | |
899 | * 1) differentiate between all holders of references to an extent so that | |
900 | * when a reference is dropped we can make sure it was a valid reference | |
901 | * before freeing the extent. | |
902 | * | |
903 | * 2) Provide enough information to quickly find the holders of an extent | |
904 | * if we notice a given block is corrupted or bad. | |
905 | * | |
906 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
907 | * maintenance. This is actually the same as #2, but with a slightly | |
908 | * different use case. | |
909 | * | |
5d4f98a2 YZ |
910 | * There are two kinds of back refs. The implicit back refs is optimized |
911 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
912 | * back refs of this kind provide information about the block's owner tree | |
913 | * and the pointer's key. These information allow us to find the block by | |
914 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
915 | * referenced by their owner trees. The location of tree block is recorded | |
916 | * in the back refs. Actually the full back refs is generic, and can be | |
917 | * used in all cases the implicit back refs is used. The major shortcoming | |
918 | * of the full back refs is its overhead. Every time a tree block gets | |
919 | * COWed, we have to update back refs entry for all pointers in it. | |
920 | * | |
921 | * For a newly allocated tree block, we use implicit back refs for | |
922 | * pointers in it. This means most tree related operations only involve | |
923 | * implicit back refs. For a tree block created in old transaction, the | |
924 | * only way to drop a reference to it is COW it. So we can detect the | |
925 | * event that tree block loses its owner tree's reference and do the | |
926 | * back refs conversion. | |
927 | * | |
928 | * When a tree block is COW'd through a tree, there are four cases: | |
929 | * | |
930 | * The reference count of the block is one and the tree is the block's | |
931 | * owner tree. Nothing to do in this case. | |
932 | * | |
933 | * The reference count of the block is one and the tree is not the | |
934 | * block's owner tree. In this case, full back refs is used for pointers | |
935 | * in the block. Remove these full back refs, add implicit back refs for | |
936 | * every pointers in the new block. | |
937 | * | |
938 | * The reference count of the block is greater than one and the tree is | |
939 | * the block's owner tree. In this case, implicit back refs is used for | |
940 | * pointers in the block. Add full back refs for every pointers in the | |
941 | * block, increase lower level extents' reference counts. The original | |
942 | * implicit back refs are entailed to the new block. | |
943 | * | |
944 | * The reference count of the block is greater than one and the tree is | |
945 | * not the block's owner tree. Add implicit back refs for every pointer in | |
946 | * the new block, increase lower level extents' reference count. | |
947 | * | |
948 | * Back Reference Key composing: | |
949 | * | |
950 | * The key objectid corresponds to the first byte in the extent, | |
951 | * The key type is used to differentiate between types of back refs. | |
952 | * There are different meanings of the key offset for different types | |
953 | * of back refs. | |
954 | * | |
d8d5f3e1 CM |
955 | * File extents can be referenced by: |
956 | * | |
957 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 958 | * - different files inside a single subvolume |
d8d5f3e1 CM |
959 | * - different offsets inside a file (bookend extents in file.c) |
960 | * | |
5d4f98a2 | 961 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
962 | * |
963 | * - Objectid of the subvolume root | |
d8d5f3e1 | 964 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
965 | * - original offset in the file |
966 | * - how many bookend extents | |
d8d5f3e1 | 967 | * |
5d4f98a2 YZ |
968 | * The key offset for the implicit back refs is hash of the first |
969 | * three fields. | |
d8d5f3e1 | 970 | * |
5d4f98a2 | 971 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 972 | * |
5d4f98a2 | 973 | * - number of pointers in the tree leaf |
d8d5f3e1 | 974 | * |
5d4f98a2 YZ |
975 | * The key offset for the implicit back refs is the first byte of |
976 | * the tree leaf | |
d8d5f3e1 | 977 | * |
5d4f98a2 YZ |
978 | * When a file extent is allocated, The implicit back refs is used. |
979 | * the fields are filled in: | |
d8d5f3e1 | 980 | * |
5d4f98a2 | 981 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 982 | * |
5d4f98a2 YZ |
983 | * When a file extent is removed file truncation, we find the |
984 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 985 | * |
5d4f98a2 | 986 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 987 | * |
5d4f98a2 | 988 | * Btree extents can be referenced by: |
d8d5f3e1 | 989 | * |
5d4f98a2 | 990 | * - Different subvolumes |
d8d5f3e1 | 991 | * |
5d4f98a2 YZ |
992 | * Both the implicit back refs and the full back refs for tree blocks |
993 | * only consist of key. The key offset for the implicit back refs is | |
994 | * objectid of block's owner tree. The key offset for the full back refs | |
995 | * is the first byte of parent block. | |
d8d5f3e1 | 996 | * |
5d4f98a2 YZ |
997 | * When implicit back refs is used, information about the lowest key and |
998 | * level of the tree block are required. These information are stored in | |
999 | * tree block info structure. | |
d8d5f3e1 | 1000 | */ |
31840ae1 | 1001 | |
5d4f98a2 YZ |
1002 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
1003 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
1004 | struct btrfs_root *root, | |
1005 | struct btrfs_path *path, | |
1006 | u64 owner, u32 extra_size) | |
7bb86316 | 1007 | { |
5d4f98a2 YZ |
1008 | struct btrfs_extent_item *item; |
1009 | struct btrfs_extent_item_v0 *ei0; | |
1010 | struct btrfs_extent_ref_v0 *ref0; | |
1011 | struct btrfs_tree_block_info *bi; | |
1012 | struct extent_buffer *leaf; | |
7bb86316 | 1013 | struct btrfs_key key; |
5d4f98a2 YZ |
1014 | struct btrfs_key found_key; |
1015 | u32 new_size = sizeof(*item); | |
1016 | u64 refs; | |
1017 | int ret; | |
1018 | ||
1019 | leaf = path->nodes[0]; | |
1020 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
1021 | ||
1022 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1023 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1024 | struct btrfs_extent_item_v0); | |
1025 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1026 | ||
1027 | if (owner == (u64)-1) { | |
1028 | while (1) { | |
1029 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1030 | ret = btrfs_next_leaf(root, path); | |
1031 | if (ret < 0) | |
1032 | return ret; | |
79787eaa | 1033 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1034 | leaf = path->nodes[0]; |
1035 | } | |
1036 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1037 | path->slots[0]); | |
1038 | BUG_ON(key.objectid != found_key.objectid); | |
1039 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1040 | path->slots[0]++; | |
1041 | continue; | |
1042 | } | |
1043 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1044 | struct btrfs_extent_ref_v0); | |
1045 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1046 | break; | |
1047 | } | |
1048 | } | |
b3b4aa74 | 1049 | btrfs_release_path(path); |
5d4f98a2 YZ |
1050 | |
1051 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1052 | new_size += sizeof(*bi); | |
1053 | ||
1054 | new_size -= sizeof(*ei0); | |
1055 | ret = btrfs_search_slot(trans, root, &key, path, | |
1056 | new_size + extra_size, 1); | |
1057 | if (ret < 0) | |
1058 | return ret; | |
79787eaa | 1059 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1060 | |
4b90c680 | 1061 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1062 | |
1063 | leaf = path->nodes[0]; | |
1064 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1065 | btrfs_set_extent_refs(leaf, item, refs); | |
1066 | /* FIXME: get real generation */ | |
1067 | btrfs_set_extent_generation(leaf, item, 0); | |
1068 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1069 | btrfs_set_extent_flags(leaf, item, | |
1070 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1071 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1072 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1073 | /* FIXME: get first key of the block */ | |
1074 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1075 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1076 | } else { | |
1077 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1078 | } | |
1079 | btrfs_mark_buffer_dirty(leaf); | |
1080 | return 0; | |
1081 | } | |
1082 | #endif | |
1083 | ||
1084 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1085 | { | |
1086 | u32 high_crc = ~(u32)0; | |
1087 | u32 low_crc = ~(u32)0; | |
1088 | __le64 lenum; | |
1089 | ||
1090 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1091 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1092 | lenum = cpu_to_le64(owner); |
163e783e | 1093 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1094 | lenum = cpu_to_le64(offset); |
163e783e | 1095 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1096 | |
1097 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1098 | } | |
1099 | ||
1100 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1101 | struct btrfs_extent_data_ref *ref) | |
1102 | { | |
1103 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1104 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1105 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1106 | } | |
1107 | ||
1108 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1109 | struct btrfs_extent_data_ref *ref, | |
1110 | u64 root_objectid, u64 owner, u64 offset) | |
1111 | { | |
1112 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1113 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1114 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1115 | return 0; | |
1116 | return 1; | |
1117 | } | |
1118 | ||
1119 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1120 | struct btrfs_root *root, | |
1121 | struct btrfs_path *path, | |
1122 | u64 bytenr, u64 parent, | |
1123 | u64 root_objectid, | |
1124 | u64 owner, u64 offset) | |
1125 | { | |
1126 | struct btrfs_key key; | |
1127 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1128 | struct extent_buffer *leaf; |
5d4f98a2 | 1129 | u32 nritems; |
74493f7a | 1130 | int ret; |
5d4f98a2 YZ |
1131 | int recow; |
1132 | int err = -ENOENT; | |
74493f7a | 1133 | |
31840ae1 | 1134 | key.objectid = bytenr; |
5d4f98a2 YZ |
1135 | if (parent) { |
1136 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1137 | key.offset = parent; | |
1138 | } else { | |
1139 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1140 | key.offset = hash_extent_data_ref(root_objectid, | |
1141 | owner, offset); | |
1142 | } | |
1143 | again: | |
1144 | recow = 0; | |
1145 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1146 | if (ret < 0) { | |
1147 | err = ret; | |
1148 | goto fail; | |
1149 | } | |
31840ae1 | 1150 | |
5d4f98a2 YZ |
1151 | if (parent) { |
1152 | if (!ret) | |
1153 | return 0; | |
1154 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1155 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1156 | btrfs_release_path(path); |
5d4f98a2 YZ |
1157 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1158 | if (ret < 0) { | |
1159 | err = ret; | |
1160 | goto fail; | |
1161 | } | |
1162 | if (!ret) | |
1163 | return 0; | |
1164 | #endif | |
1165 | goto fail; | |
31840ae1 ZY |
1166 | } |
1167 | ||
1168 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1169 | nritems = btrfs_header_nritems(leaf); |
1170 | while (1) { | |
1171 | if (path->slots[0] >= nritems) { | |
1172 | ret = btrfs_next_leaf(root, path); | |
1173 | if (ret < 0) | |
1174 | err = ret; | |
1175 | if (ret) | |
1176 | goto fail; | |
1177 | ||
1178 | leaf = path->nodes[0]; | |
1179 | nritems = btrfs_header_nritems(leaf); | |
1180 | recow = 1; | |
1181 | } | |
1182 | ||
1183 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1184 | if (key.objectid != bytenr || | |
1185 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1186 | goto fail; | |
1187 | ||
1188 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1189 | struct btrfs_extent_data_ref); | |
1190 | ||
1191 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1192 | owner, offset)) { | |
1193 | if (recow) { | |
b3b4aa74 | 1194 | btrfs_release_path(path); |
5d4f98a2 YZ |
1195 | goto again; |
1196 | } | |
1197 | err = 0; | |
1198 | break; | |
1199 | } | |
1200 | path->slots[0]++; | |
31840ae1 | 1201 | } |
5d4f98a2 YZ |
1202 | fail: |
1203 | return err; | |
31840ae1 ZY |
1204 | } |
1205 | ||
5d4f98a2 YZ |
1206 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1207 | struct btrfs_root *root, | |
1208 | struct btrfs_path *path, | |
1209 | u64 bytenr, u64 parent, | |
1210 | u64 root_objectid, u64 owner, | |
1211 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1212 | { |
1213 | struct btrfs_key key; | |
1214 | struct extent_buffer *leaf; | |
5d4f98a2 | 1215 | u32 size; |
31840ae1 ZY |
1216 | u32 num_refs; |
1217 | int ret; | |
74493f7a | 1218 | |
74493f7a | 1219 | key.objectid = bytenr; |
5d4f98a2 YZ |
1220 | if (parent) { |
1221 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1222 | key.offset = parent; | |
1223 | size = sizeof(struct btrfs_shared_data_ref); | |
1224 | } else { | |
1225 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1226 | key.offset = hash_extent_data_ref(root_objectid, | |
1227 | owner, offset); | |
1228 | size = sizeof(struct btrfs_extent_data_ref); | |
1229 | } | |
74493f7a | 1230 | |
5d4f98a2 YZ |
1231 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1232 | if (ret && ret != -EEXIST) | |
1233 | goto fail; | |
1234 | ||
1235 | leaf = path->nodes[0]; | |
1236 | if (parent) { | |
1237 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1238 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1239 | struct btrfs_shared_data_ref); |
1240 | if (ret == 0) { | |
1241 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1242 | } else { | |
1243 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1244 | num_refs += refs_to_add; | |
1245 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1246 | } |
5d4f98a2 YZ |
1247 | } else { |
1248 | struct btrfs_extent_data_ref *ref; | |
1249 | while (ret == -EEXIST) { | |
1250 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1251 | struct btrfs_extent_data_ref); | |
1252 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1253 | owner, offset)) | |
1254 | break; | |
b3b4aa74 | 1255 | btrfs_release_path(path); |
5d4f98a2 YZ |
1256 | key.offset++; |
1257 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1258 | size); | |
1259 | if (ret && ret != -EEXIST) | |
1260 | goto fail; | |
31840ae1 | 1261 | |
5d4f98a2 YZ |
1262 | leaf = path->nodes[0]; |
1263 | } | |
1264 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1265 | struct btrfs_extent_data_ref); | |
1266 | if (ret == 0) { | |
1267 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1268 | root_objectid); | |
1269 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1270 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1271 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1272 | } else { | |
1273 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1274 | num_refs += refs_to_add; | |
1275 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1276 | } |
31840ae1 | 1277 | } |
5d4f98a2 YZ |
1278 | btrfs_mark_buffer_dirty(leaf); |
1279 | ret = 0; | |
1280 | fail: | |
b3b4aa74 | 1281 | btrfs_release_path(path); |
7bb86316 | 1282 | return ret; |
74493f7a CM |
1283 | } |
1284 | ||
5d4f98a2 YZ |
1285 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1286 | struct btrfs_root *root, | |
1287 | struct btrfs_path *path, | |
1288 | int refs_to_drop) | |
31840ae1 | 1289 | { |
5d4f98a2 YZ |
1290 | struct btrfs_key key; |
1291 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1292 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1293 | struct extent_buffer *leaf; |
5d4f98a2 | 1294 | u32 num_refs = 0; |
31840ae1 ZY |
1295 | int ret = 0; |
1296 | ||
1297 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1298 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1299 | ||
1300 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1301 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1302 | struct btrfs_extent_data_ref); | |
1303 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1304 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1305 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1306 | struct btrfs_shared_data_ref); | |
1307 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1308 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1309 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1310 | struct btrfs_extent_ref_v0 *ref0; | |
1311 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1312 | struct btrfs_extent_ref_v0); | |
1313 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1314 | #endif | |
1315 | } else { | |
1316 | BUG(); | |
1317 | } | |
1318 | ||
56bec294 CM |
1319 | BUG_ON(num_refs < refs_to_drop); |
1320 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1321 | |
31840ae1 ZY |
1322 | if (num_refs == 0) { |
1323 | ret = btrfs_del_item(trans, root, path); | |
1324 | } else { | |
5d4f98a2 YZ |
1325 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1326 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1327 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1328 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1329 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1330 | else { | |
1331 | struct btrfs_extent_ref_v0 *ref0; | |
1332 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1333 | struct btrfs_extent_ref_v0); | |
1334 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1335 | } | |
1336 | #endif | |
31840ae1 ZY |
1337 | btrfs_mark_buffer_dirty(leaf); |
1338 | } | |
31840ae1 ZY |
1339 | return ret; |
1340 | } | |
1341 | ||
5d4f98a2 YZ |
1342 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1343 | struct btrfs_path *path, | |
1344 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1345 | { |
5d4f98a2 YZ |
1346 | struct btrfs_key key; |
1347 | struct extent_buffer *leaf; | |
1348 | struct btrfs_extent_data_ref *ref1; | |
1349 | struct btrfs_shared_data_ref *ref2; | |
1350 | u32 num_refs = 0; | |
1351 | ||
1352 | leaf = path->nodes[0]; | |
1353 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1354 | if (iref) { | |
1355 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1356 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1357 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1358 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1359 | } else { | |
1360 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1361 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1362 | } | |
1363 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1364 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1365 | struct btrfs_extent_data_ref); | |
1366 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1367 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1368 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1369 | struct btrfs_shared_data_ref); | |
1370 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1371 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1372 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1373 | struct btrfs_extent_ref_v0 *ref0; | |
1374 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1375 | struct btrfs_extent_ref_v0); | |
1376 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1377 | #endif |
5d4f98a2 YZ |
1378 | } else { |
1379 | WARN_ON(1); | |
1380 | } | |
1381 | return num_refs; | |
1382 | } | |
15916de8 | 1383 | |
5d4f98a2 YZ |
1384 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1385 | struct btrfs_root *root, | |
1386 | struct btrfs_path *path, | |
1387 | u64 bytenr, u64 parent, | |
1388 | u64 root_objectid) | |
1f3c79a2 | 1389 | { |
5d4f98a2 | 1390 | struct btrfs_key key; |
1f3c79a2 | 1391 | int ret; |
1f3c79a2 | 1392 | |
5d4f98a2 YZ |
1393 | key.objectid = bytenr; |
1394 | if (parent) { | |
1395 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1396 | key.offset = parent; | |
1397 | } else { | |
1398 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1399 | key.offset = root_objectid; | |
1f3c79a2 LH |
1400 | } |
1401 | ||
5d4f98a2 YZ |
1402 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1403 | if (ret > 0) | |
1404 | ret = -ENOENT; | |
1405 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1406 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1407 | btrfs_release_path(path); |
5d4f98a2 YZ |
1408 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1409 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1410 | if (ret > 0) | |
1411 | ret = -ENOENT; | |
1412 | } | |
1f3c79a2 | 1413 | #endif |
5d4f98a2 | 1414 | return ret; |
1f3c79a2 LH |
1415 | } |
1416 | ||
5d4f98a2 YZ |
1417 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1418 | struct btrfs_root *root, | |
1419 | struct btrfs_path *path, | |
1420 | u64 bytenr, u64 parent, | |
1421 | u64 root_objectid) | |
31840ae1 | 1422 | { |
5d4f98a2 | 1423 | struct btrfs_key key; |
31840ae1 | 1424 | int ret; |
31840ae1 | 1425 | |
5d4f98a2 YZ |
1426 | key.objectid = bytenr; |
1427 | if (parent) { | |
1428 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1429 | key.offset = parent; | |
1430 | } else { | |
1431 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1432 | key.offset = root_objectid; | |
1433 | } | |
1434 | ||
1435 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1436 | btrfs_release_path(path); |
31840ae1 ZY |
1437 | return ret; |
1438 | } | |
1439 | ||
5d4f98a2 | 1440 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1441 | { |
5d4f98a2 YZ |
1442 | int type; |
1443 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1444 | if (parent > 0) | |
1445 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1446 | else | |
1447 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1448 | } else { | |
1449 | if (parent > 0) | |
1450 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1451 | else | |
1452 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1453 | } | |
1454 | return type; | |
31840ae1 | 1455 | } |
56bec294 | 1456 | |
2c47e605 YZ |
1457 | static int find_next_key(struct btrfs_path *path, int level, |
1458 | struct btrfs_key *key) | |
56bec294 | 1459 | |
02217ed2 | 1460 | { |
2c47e605 | 1461 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1462 | if (!path->nodes[level]) |
1463 | break; | |
5d4f98a2 YZ |
1464 | if (path->slots[level] + 1 >= |
1465 | btrfs_header_nritems(path->nodes[level])) | |
1466 | continue; | |
1467 | if (level == 0) | |
1468 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1469 | path->slots[level] + 1); | |
1470 | else | |
1471 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1472 | path->slots[level] + 1); | |
1473 | return 0; | |
1474 | } | |
1475 | return 1; | |
1476 | } | |
037e6390 | 1477 | |
5d4f98a2 YZ |
1478 | /* |
1479 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1480 | * to the address of inline back ref, and 0 is returned. | |
1481 | * | |
1482 | * if back ref isn't found, *ref_ret is set to the address where it | |
1483 | * should be inserted, and -ENOENT is returned. | |
1484 | * | |
1485 | * if insert is true and there are too many inline back refs, the path | |
1486 | * points to the extent item, and -EAGAIN is returned. | |
1487 | * | |
1488 | * NOTE: inline back refs are ordered in the same way that back ref | |
1489 | * items in the tree are ordered. | |
1490 | */ | |
1491 | static noinline_for_stack | |
1492 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1493 | struct btrfs_root *root, | |
1494 | struct btrfs_path *path, | |
1495 | struct btrfs_extent_inline_ref **ref_ret, | |
1496 | u64 bytenr, u64 num_bytes, | |
1497 | u64 parent, u64 root_objectid, | |
1498 | u64 owner, u64 offset, int insert) | |
1499 | { | |
1500 | struct btrfs_key key; | |
1501 | struct extent_buffer *leaf; | |
1502 | struct btrfs_extent_item *ei; | |
1503 | struct btrfs_extent_inline_ref *iref; | |
1504 | u64 flags; | |
1505 | u64 item_size; | |
1506 | unsigned long ptr; | |
1507 | unsigned long end; | |
1508 | int extra_size; | |
1509 | int type; | |
1510 | int want; | |
1511 | int ret; | |
1512 | int err = 0; | |
3173a18f JB |
1513 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1514 | SKINNY_METADATA); | |
26b8003f | 1515 | |
db94535d | 1516 | key.objectid = bytenr; |
31840ae1 | 1517 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1518 | key.offset = num_bytes; |
31840ae1 | 1519 | |
5d4f98a2 YZ |
1520 | want = extent_ref_type(parent, owner); |
1521 | if (insert) { | |
1522 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1523 | path->keep_locks = 1; |
5d4f98a2 YZ |
1524 | } else |
1525 | extra_size = -1; | |
3173a18f JB |
1526 | |
1527 | /* | |
1528 | * Owner is our parent level, so we can just add one to get the level | |
1529 | * for the block we are interested in. | |
1530 | */ | |
1531 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1532 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1533 | key.offset = owner; | |
1534 | } | |
1535 | ||
1536 | again: | |
5d4f98a2 | 1537 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1538 | if (ret < 0) { |
5d4f98a2 YZ |
1539 | err = ret; |
1540 | goto out; | |
1541 | } | |
3173a18f JB |
1542 | |
1543 | /* | |
1544 | * We may be a newly converted file system which still has the old fat | |
1545 | * extent entries for metadata, so try and see if we have one of those. | |
1546 | */ | |
1547 | if (ret > 0 && skinny_metadata) { | |
1548 | skinny_metadata = false; | |
1549 | if (path->slots[0]) { | |
1550 | path->slots[0]--; | |
1551 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1552 | path->slots[0]); | |
1553 | if (key.objectid == bytenr && | |
1554 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1555 | key.offset == num_bytes) | |
1556 | ret = 0; | |
1557 | } | |
1558 | if (ret) { | |
1559 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1560 | key.offset = num_bytes; | |
1561 | btrfs_release_path(path); | |
1562 | goto again; | |
1563 | } | |
1564 | } | |
1565 | ||
79787eaa JM |
1566 | if (ret && !insert) { |
1567 | err = -ENOENT; | |
1568 | goto out; | |
492104c8 JB |
1569 | } else if (ret) { |
1570 | err = -EIO; | |
1571 | WARN_ON(1); | |
1572 | goto out; | |
79787eaa | 1573 | } |
5d4f98a2 YZ |
1574 | |
1575 | leaf = path->nodes[0]; | |
1576 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1577 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1578 | if (item_size < sizeof(*ei)) { | |
1579 | if (!insert) { | |
1580 | err = -ENOENT; | |
1581 | goto out; | |
1582 | } | |
1583 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1584 | extra_size); | |
1585 | if (ret < 0) { | |
1586 | err = ret; | |
1587 | goto out; | |
1588 | } | |
1589 | leaf = path->nodes[0]; | |
1590 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1591 | } | |
1592 | #endif | |
1593 | BUG_ON(item_size < sizeof(*ei)); | |
1594 | ||
5d4f98a2 YZ |
1595 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1596 | flags = btrfs_extent_flags(leaf, ei); | |
1597 | ||
1598 | ptr = (unsigned long)(ei + 1); | |
1599 | end = (unsigned long)ei + item_size; | |
1600 | ||
3173a18f | 1601 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1602 | ptr += sizeof(struct btrfs_tree_block_info); |
1603 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1604 | } |
1605 | ||
1606 | err = -ENOENT; | |
1607 | while (1) { | |
1608 | if (ptr >= end) { | |
1609 | WARN_ON(ptr > end); | |
1610 | break; | |
1611 | } | |
1612 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1613 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1614 | if (want < type) | |
1615 | break; | |
1616 | if (want > type) { | |
1617 | ptr += btrfs_extent_inline_ref_size(type); | |
1618 | continue; | |
1619 | } | |
1620 | ||
1621 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1622 | struct btrfs_extent_data_ref *dref; | |
1623 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1624 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1625 | owner, offset)) { | |
1626 | err = 0; | |
1627 | break; | |
1628 | } | |
1629 | if (hash_extent_data_ref_item(leaf, dref) < | |
1630 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1631 | break; | |
1632 | } else { | |
1633 | u64 ref_offset; | |
1634 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1635 | if (parent > 0) { | |
1636 | if (parent == ref_offset) { | |
1637 | err = 0; | |
1638 | break; | |
1639 | } | |
1640 | if (ref_offset < parent) | |
1641 | break; | |
1642 | } else { | |
1643 | if (root_objectid == ref_offset) { | |
1644 | err = 0; | |
1645 | break; | |
1646 | } | |
1647 | if (ref_offset < root_objectid) | |
1648 | break; | |
1649 | } | |
1650 | } | |
1651 | ptr += btrfs_extent_inline_ref_size(type); | |
1652 | } | |
1653 | if (err == -ENOENT && insert) { | |
1654 | if (item_size + extra_size >= | |
1655 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1656 | err = -EAGAIN; | |
1657 | goto out; | |
1658 | } | |
1659 | /* | |
1660 | * To add new inline back ref, we have to make sure | |
1661 | * there is no corresponding back ref item. | |
1662 | * For simplicity, we just do not add new inline back | |
1663 | * ref if there is any kind of item for this block | |
1664 | */ | |
2c47e605 YZ |
1665 | if (find_next_key(path, 0, &key) == 0 && |
1666 | key.objectid == bytenr && | |
85d4198e | 1667 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1668 | err = -EAGAIN; |
1669 | goto out; | |
1670 | } | |
1671 | } | |
1672 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1673 | out: | |
85d4198e | 1674 | if (insert) { |
5d4f98a2 YZ |
1675 | path->keep_locks = 0; |
1676 | btrfs_unlock_up_safe(path, 1); | |
1677 | } | |
1678 | return err; | |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * helper to add new inline back ref | |
1683 | */ | |
1684 | static noinline_for_stack | |
fd279fae | 1685 | void setup_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1686 | struct btrfs_path *path, |
1687 | struct btrfs_extent_inline_ref *iref, | |
1688 | u64 parent, u64 root_objectid, | |
1689 | u64 owner, u64 offset, int refs_to_add, | |
1690 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1691 | { |
1692 | struct extent_buffer *leaf; | |
1693 | struct btrfs_extent_item *ei; | |
1694 | unsigned long ptr; | |
1695 | unsigned long end; | |
1696 | unsigned long item_offset; | |
1697 | u64 refs; | |
1698 | int size; | |
1699 | int type; | |
5d4f98a2 YZ |
1700 | |
1701 | leaf = path->nodes[0]; | |
1702 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1703 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1704 | ||
1705 | type = extent_ref_type(parent, owner); | |
1706 | size = btrfs_extent_inline_ref_size(type); | |
1707 | ||
4b90c680 | 1708 | btrfs_extend_item(root, path, size); |
5d4f98a2 YZ |
1709 | |
1710 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1711 | refs = btrfs_extent_refs(leaf, ei); | |
1712 | refs += refs_to_add; | |
1713 | btrfs_set_extent_refs(leaf, ei, refs); | |
1714 | if (extent_op) | |
1715 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1716 | ||
1717 | ptr = (unsigned long)ei + item_offset; | |
1718 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1719 | if (ptr < end - size) | |
1720 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1721 | end - size - ptr); | |
1722 | ||
1723 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1724 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1725 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1726 | struct btrfs_extent_data_ref *dref; | |
1727 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1728 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1729 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1730 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1731 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1732 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1733 | struct btrfs_shared_data_ref *sref; | |
1734 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1735 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1736 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1737 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1738 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1739 | } else { | |
1740 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1741 | } | |
1742 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1743 | } |
1744 | ||
1745 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1746 | struct btrfs_root *root, | |
1747 | struct btrfs_path *path, | |
1748 | struct btrfs_extent_inline_ref **ref_ret, | |
1749 | u64 bytenr, u64 num_bytes, u64 parent, | |
1750 | u64 root_objectid, u64 owner, u64 offset) | |
1751 | { | |
1752 | int ret; | |
1753 | ||
1754 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1755 | bytenr, num_bytes, parent, | |
1756 | root_objectid, owner, offset, 0); | |
1757 | if (ret != -ENOENT) | |
54aa1f4d | 1758 | return ret; |
5d4f98a2 | 1759 | |
b3b4aa74 | 1760 | btrfs_release_path(path); |
5d4f98a2 YZ |
1761 | *ref_ret = NULL; |
1762 | ||
1763 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1764 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1765 | root_objectid); | |
1766 | } else { | |
1767 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1768 | root_objectid, owner, offset); | |
b9473439 | 1769 | } |
5d4f98a2 YZ |
1770 | return ret; |
1771 | } | |
31840ae1 | 1772 | |
5d4f98a2 YZ |
1773 | /* |
1774 | * helper to update/remove inline back ref | |
1775 | */ | |
1776 | static noinline_for_stack | |
afe5fea7 | 1777 | void update_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1778 | struct btrfs_path *path, |
1779 | struct btrfs_extent_inline_ref *iref, | |
1780 | int refs_to_mod, | |
1781 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1782 | { |
1783 | struct extent_buffer *leaf; | |
1784 | struct btrfs_extent_item *ei; | |
1785 | struct btrfs_extent_data_ref *dref = NULL; | |
1786 | struct btrfs_shared_data_ref *sref = NULL; | |
1787 | unsigned long ptr; | |
1788 | unsigned long end; | |
1789 | u32 item_size; | |
1790 | int size; | |
1791 | int type; | |
5d4f98a2 YZ |
1792 | u64 refs; |
1793 | ||
1794 | leaf = path->nodes[0]; | |
1795 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1796 | refs = btrfs_extent_refs(leaf, ei); | |
1797 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1798 | refs += refs_to_mod; | |
1799 | btrfs_set_extent_refs(leaf, ei, refs); | |
1800 | if (extent_op) | |
1801 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1802 | ||
1803 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1804 | ||
1805 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1806 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1807 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1808 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1809 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1810 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1811 | } else { | |
1812 | refs = 1; | |
1813 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1814 | } |
31840ae1 | 1815 | |
5d4f98a2 YZ |
1816 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1817 | refs += refs_to_mod; | |
1818 | ||
1819 | if (refs > 0) { | |
1820 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1821 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1822 | else | |
1823 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1824 | } else { | |
1825 | size = btrfs_extent_inline_ref_size(type); | |
1826 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1827 | ptr = (unsigned long)iref; | |
1828 | end = (unsigned long)ei + item_size; | |
1829 | if (ptr + size < end) | |
1830 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1831 | end - ptr - size); | |
1832 | item_size -= size; | |
afe5fea7 | 1833 | btrfs_truncate_item(root, path, item_size, 1); |
5d4f98a2 YZ |
1834 | } |
1835 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1836 | } |
1837 | ||
1838 | static noinline_for_stack | |
1839 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1840 | struct btrfs_root *root, | |
1841 | struct btrfs_path *path, | |
1842 | u64 bytenr, u64 num_bytes, u64 parent, | |
1843 | u64 root_objectid, u64 owner, | |
1844 | u64 offset, int refs_to_add, | |
1845 | struct btrfs_delayed_extent_op *extent_op) | |
1846 | { | |
1847 | struct btrfs_extent_inline_ref *iref; | |
1848 | int ret; | |
1849 | ||
1850 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1851 | bytenr, num_bytes, parent, | |
1852 | root_objectid, owner, offset, 1); | |
1853 | if (ret == 0) { | |
1854 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
afe5fea7 | 1855 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1856 | refs_to_add, extent_op); |
5d4f98a2 | 1857 | } else if (ret == -ENOENT) { |
fd279fae | 1858 | setup_inline_extent_backref(root, path, iref, parent, |
143bede5 JM |
1859 | root_objectid, owner, offset, |
1860 | refs_to_add, extent_op); | |
1861 | ret = 0; | |
771ed689 | 1862 | } |
5d4f98a2 YZ |
1863 | return ret; |
1864 | } | |
31840ae1 | 1865 | |
5d4f98a2 YZ |
1866 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1867 | struct btrfs_root *root, | |
1868 | struct btrfs_path *path, | |
1869 | u64 bytenr, u64 parent, u64 root_objectid, | |
1870 | u64 owner, u64 offset, int refs_to_add) | |
1871 | { | |
1872 | int ret; | |
1873 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1874 | BUG_ON(refs_to_add != 1); | |
1875 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1876 | parent, root_objectid); | |
1877 | } else { | |
1878 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1879 | parent, root_objectid, | |
1880 | owner, offset, refs_to_add); | |
1881 | } | |
1882 | return ret; | |
1883 | } | |
56bec294 | 1884 | |
5d4f98a2 YZ |
1885 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1886 | struct btrfs_root *root, | |
1887 | struct btrfs_path *path, | |
1888 | struct btrfs_extent_inline_ref *iref, | |
1889 | int refs_to_drop, int is_data) | |
1890 | { | |
143bede5 | 1891 | int ret = 0; |
b9473439 | 1892 | |
5d4f98a2 YZ |
1893 | BUG_ON(!is_data && refs_to_drop != 1); |
1894 | if (iref) { | |
afe5fea7 | 1895 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1896 | -refs_to_drop, NULL); |
5d4f98a2 YZ |
1897 | } else if (is_data) { |
1898 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1899 | } else { | |
1900 | ret = btrfs_del_item(trans, root, path); | |
1901 | } | |
1902 | return ret; | |
1903 | } | |
1904 | ||
5378e607 | 1905 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1906 | u64 start, u64 len) |
1907 | { | |
5378e607 | 1908 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1909 | } |
5d4f98a2 YZ |
1910 | |
1911 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1912 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1913 | { |
5d4f98a2 | 1914 | int ret; |
5378e607 | 1915 | u64 discarded_bytes = 0; |
a1d3c478 | 1916 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1917 | |
e244a0ae | 1918 | |
5d4f98a2 | 1919 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1920 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1921 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1922 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1923 | if (!ret) { |
a1d3c478 | 1924 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1925 | int i; |
1926 | ||
5d4f98a2 | 1927 | |
a1d3c478 | 1928 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1929 | if (!stripe->dev->can_discard) |
1930 | continue; | |
1931 | ||
5378e607 LD |
1932 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1933 | stripe->physical, | |
1934 | stripe->length); | |
1935 | if (!ret) | |
1936 | discarded_bytes += stripe->length; | |
1937 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1938 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1939 | |
1940 | /* | |
1941 | * Just in case we get back EOPNOTSUPP for some reason, | |
1942 | * just ignore the return value so we don't screw up | |
1943 | * people calling discard_extent. | |
1944 | */ | |
1945 | ret = 0; | |
5d4f98a2 | 1946 | } |
a1d3c478 | 1947 | kfree(bbio); |
5d4f98a2 | 1948 | } |
5378e607 LD |
1949 | |
1950 | if (actual_bytes) | |
1951 | *actual_bytes = discarded_bytes; | |
1952 | ||
5d4f98a2 | 1953 | |
53b381b3 DW |
1954 | if (ret == -EOPNOTSUPP) |
1955 | ret = 0; | |
5d4f98a2 | 1956 | return ret; |
5d4f98a2 YZ |
1957 | } |
1958 | ||
79787eaa | 1959 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1960 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1961 | struct btrfs_root *root, | |
1962 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1963 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1964 | { |
1965 | int ret; | |
66d7e7f0 AJ |
1966 | struct btrfs_fs_info *fs_info = root->fs_info; |
1967 | ||
5d4f98a2 YZ |
1968 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1969 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1970 | ||
1971 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1972 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1973 | num_bytes, | |
5d4f98a2 | 1974 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1975 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1976 | } else { |
66d7e7f0 AJ |
1977 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1978 | num_bytes, | |
5d4f98a2 | 1979 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1980 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1981 | } |
1982 | return ret; | |
1983 | } | |
1984 | ||
1985 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1986 | struct btrfs_root *root, | |
1987 | u64 bytenr, u64 num_bytes, | |
1988 | u64 parent, u64 root_objectid, | |
1989 | u64 owner, u64 offset, int refs_to_add, | |
1990 | struct btrfs_delayed_extent_op *extent_op) | |
1991 | { | |
1992 | struct btrfs_path *path; | |
1993 | struct extent_buffer *leaf; | |
1994 | struct btrfs_extent_item *item; | |
1995 | u64 refs; | |
1996 | int ret; | |
1997 | int err = 0; | |
1998 | ||
1999 | path = btrfs_alloc_path(); | |
2000 | if (!path) | |
2001 | return -ENOMEM; | |
2002 | ||
2003 | path->reada = 1; | |
2004 | path->leave_spinning = 1; | |
2005 | /* this will setup the path even if it fails to insert the back ref */ | |
2006 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
2007 | path, bytenr, num_bytes, parent, | |
2008 | root_objectid, owner, offset, | |
2009 | refs_to_add, extent_op); | |
2010 | if (ret == 0) | |
2011 | goto out; | |
2012 | ||
2013 | if (ret != -EAGAIN) { | |
2014 | err = ret; | |
2015 | goto out; | |
2016 | } | |
2017 | ||
2018 | leaf = path->nodes[0]; | |
2019 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2020 | refs = btrfs_extent_refs(leaf, item); | |
2021 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2022 | if (extent_op) | |
2023 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2024 | |
5d4f98a2 | 2025 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2026 | btrfs_release_path(path); |
56bec294 CM |
2027 | |
2028 | path->reada = 1; | |
b9473439 CM |
2029 | path->leave_spinning = 1; |
2030 | ||
56bec294 CM |
2031 | /* now insert the actual backref */ |
2032 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
2033 | path, bytenr, parent, root_objectid, |
2034 | owner, offset, refs_to_add); | |
79787eaa JM |
2035 | if (ret) |
2036 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 2037 | out: |
56bec294 | 2038 | btrfs_free_path(path); |
5d4f98a2 | 2039 | return err; |
56bec294 CM |
2040 | } |
2041 | ||
5d4f98a2 YZ |
2042 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2043 | struct btrfs_root *root, | |
2044 | struct btrfs_delayed_ref_node *node, | |
2045 | struct btrfs_delayed_extent_op *extent_op, | |
2046 | int insert_reserved) | |
56bec294 | 2047 | { |
5d4f98a2 YZ |
2048 | int ret = 0; |
2049 | struct btrfs_delayed_data_ref *ref; | |
2050 | struct btrfs_key ins; | |
2051 | u64 parent = 0; | |
2052 | u64 ref_root = 0; | |
2053 | u64 flags = 0; | |
2054 | ||
2055 | ins.objectid = node->bytenr; | |
2056 | ins.offset = node->num_bytes; | |
2057 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2058 | ||
2059 | ref = btrfs_delayed_node_to_data_ref(node); | |
2060 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2061 | parent = ref->parent; | |
2062 | else | |
2063 | ref_root = ref->root; | |
2064 | ||
2065 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2066 | if (extent_op) |
5d4f98a2 | 2067 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2068 | ret = alloc_reserved_file_extent(trans, root, |
2069 | parent, ref_root, flags, | |
2070 | ref->objectid, ref->offset, | |
2071 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
2072 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2073 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2074 | node->num_bytes, parent, | |
2075 | ref_root, ref->objectid, | |
2076 | ref->offset, node->ref_mod, | |
2077 | extent_op); | |
2078 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2079 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2080 | node->num_bytes, parent, | |
2081 | ref_root, ref->objectid, | |
2082 | ref->offset, node->ref_mod, | |
2083 | extent_op); | |
2084 | } else { | |
2085 | BUG(); | |
2086 | } | |
2087 | return ret; | |
2088 | } | |
2089 | ||
2090 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2091 | struct extent_buffer *leaf, | |
2092 | struct btrfs_extent_item *ei) | |
2093 | { | |
2094 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2095 | if (extent_op->update_flags) { | |
2096 | flags |= extent_op->flags_to_set; | |
2097 | btrfs_set_extent_flags(leaf, ei, flags); | |
2098 | } | |
2099 | ||
2100 | if (extent_op->update_key) { | |
2101 | struct btrfs_tree_block_info *bi; | |
2102 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2103 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2104 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2109 | struct btrfs_root *root, | |
2110 | struct btrfs_delayed_ref_node *node, | |
2111 | struct btrfs_delayed_extent_op *extent_op) | |
2112 | { | |
2113 | struct btrfs_key key; | |
2114 | struct btrfs_path *path; | |
2115 | struct btrfs_extent_item *ei; | |
2116 | struct extent_buffer *leaf; | |
2117 | u32 item_size; | |
56bec294 | 2118 | int ret; |
5d4f98a2 | 2119 | int err = 0; |
3173a18f JB |
2120 | int metadata = (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2121 | node->type == BTRFS_SHARED_BLOCK_REF_KEY); | |
5d4f98a2 | 2122 | |
79787eaa JM |
2123 | if (trans->aborted) |
2124 | return 0; | |
2125 | ||
3173a18f JB |
2126 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2127 | metadata = 0; | |
2128 | ||
5d4f98a2 YZ |
2129 | path = btrfs_alloc_path(); |
2130 | if (!path) | |
2131 | return -ENOMEM; | |
2132 | ||
2133 | key.objectid = node->bytenr; | |
5d4f98a2 | 2134 | |
3173a18f JB |
2135 | if (metadata) { |
2136 | struct btrfs_delayed_tree_ref *tree_ref; | |
2137 | ||
2138 | tree_ref = btrfs_delayed_node_to_tree_ref(node); | |
2139 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2140 | key.offset = tree_ref->level; | |
2141 | } else { | |
2142 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2143 | key.offset = node->num_bytes; | |
2144 | } | |
2145 | ||
2146 | again: | |
5d4f98a2 YZ |
2147 | path->reada = 1; |
2148 | path->leave_spinning = 1; | |
2149 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2150 | path, 0, 1); | |
2151 | if (ret < 0) { | |
2152 | err = ret; | |
2153 | goto out; | |
2154 | } | |
2155 | if (ret > 0) { | |
3173a18f JB |
2156 | if (metadata) { |
2157 | btrfs_release_path(path); | |
2158 | metadata = 0; | |
2159 | ||
2160 | key.offset = node->num_bytes; | |
2161 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2162 | goto again; | |
2163 | } | |
5d4f98a2 YZ |
2164 | err = -EIO; |
2165 | goto out; | |
2166 | } | |
2167 | ||
2168 | leaf = path->nodes[0]; | |
2169 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2170 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2171 | if (item_size < sizeof(*ei)) { | |
2172 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2173 | path, (u64)-1, 0); | |
2174 | if (ret < 0) { | |
2175 | err = ret; | |
2176 | goto out; | |
2177 | } | |
2178 | leaf = path->nodes[0]; | |
2179 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2180 | } | |
2181 | #endif | |
2182 | BUG_ON(item_size < sizeof(*ei)); | |
2183 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2184 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2185 | |
5d4f98a2 YZ |
2186 | btrfs_mark_buffer_dirty(leaf); |
2187 | out: | |
2188 | btrfs_free_path(path); | |
2189 | return err; | |
56bec294 CM |
2190 | } |
2191 | ||
5d4f98a2 YZ |
2192 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2193 | struct btrfs_root *root, | |
2194 | struct btrfs_delayed_ref_node *node, | |
2195 | struct btrfs_delayed_extent_op *extent_op, | |
2196 | int insert_reserved) | |
56bec294 CM |
2197 | { |
2198 | int ret = 0; | |
5d4f98a2 YZ |
2199 | struct btrfs_delayed_tree_ref *ref; |
2200 | struct btrfs_key ins; | |
2201 | u64 parent = 0; | |
2202 | u64 ref_root = 0; | |
3173a18f JB |
2203 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2204 | SKINNY_METADATA); | |
56bec294 | 2205 | |
5d4f98a2 YZ |
2206 | ref = btrfs_delayed_node_to_tree_ref(node); |
2207 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2208 | parent = ref->parent; | |
2209 | else | |
2210 | ref_root = ref->root; | |
2211 | ||
3173a18f JB |
2212 | ins.objectid = node->bytenr; |
2213 | if (skinny_metadata) { | |
2214 | ins.offset = ref->level; | |
2215 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2216 | } else { | |
2217 | ins.offset = node->num_bytes; | |
2218 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2219 | } | |
2220 | ||
5d4f98a2 YZ |
2221 | BUG_ON(node->ref_mod != 1); |
2222 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2223 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2224 | ret = alloc_reserved_tree_block(trans, root, |
2225 | parent, ref_root, | |
2226 | extent_op->flags_to_set, | |
2227 | &extent_op->key, | |
2228 | ref->level, &ins); | |
5d4f98a2 YZ |
2229 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2230 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2231 | node->num_bytes, parent, ref_root, | |
2232 | ref->level, 0, 1, extent_op); | |
2233 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2234 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2235 | node->num_bytes, parent, ref_root, | |
2236 | ref->level, 0, 1, extent_op); | |
2237 | } else { | |
2238 | BUG(); | |
2239 | } | |
56bec294 CM |
2240 | return ret; |
2241 | } | |
2242 | ||
2243 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2244 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2245 | struct btrfs_root *root, | |
2246 | struct btrfs_delayed_ref_node *node, | |
2247 | struct btrfs_delayed_extent_op *extent_op, | |
2248 | int insert_reserved) | |
56bec294 | 2249 | { |
79787eaa JM |
2250 | int ret = 0; |
2251 | ||
2252 | if (trans->aborted) | |
2253 | return 0; | |
2254 | ||
5d4f98a2 | 2255 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2256 | struct btrfs_delayed_ref_head *head; |
2257 | /* | |
2258 | * we've hit the end of the chain and we were supposed | |
2259 | * to insert this extent into the tree. But, it got | |
2260 | * deleted before we ever needed to insert it, so all | |
2261 | * we have to do is clean up the accounting | |
2262 | */ | |
5d4f98a2 YZ |
2263 | BUG_ON(extent_op); |
2264 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2265 | if (insert_reserved) { |
f0486c68 YZ |
2266 | btrfs_pin_extent(root, node->bytenr, |
2267 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2268 | if (head->is_data) { |
2269 | ret = btrfs_del_csums(trans, root, | |
2270 | node->bytenr, | |
2271 | node->num_bytes); | |
5d4f98a2 | 2272 | } |
56bec294 | 2273 | } |
79787eaa | 2274 | return ret; |
56bec294 CM |
2275 | } |
2276 | ||
5d4f98a2 YZ |
2277 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2278 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2279 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2280 | insert_reserved); | |
2281 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2282 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2283 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2284 | insert_reserved); | |
2285 | else | |
2286 | BUG(); | |
2287 | return ret; | |
56bec294 CM |
2288 | } |
2289 | ||
2290 | static noinline struct btrfs_delayed_ref_node * | |
2291 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2292 | { | |
2293 | struct rb_node *node; | |
2294 | struct btrfs_delayed_ref_node *ref; | |
2295 | int action = BTRFS_ADD_DELAYED_REF; | |
2296 | again: | |
2297 | /* | |
2298 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2299 | * this prevents ref count from going down to zero when | |
2300 | * there still are pending delayed ref. | |
2301 | */ | |
2302 | node = rb_prev(&head->node.rb_node); | |
2303 | while (1) { | |
2304 | if (!node) | |
2305 | break; | |
2306 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2307 | rb_node); | |
2308 | if (ref->bytenr != head->node.bytenr) | |
2309 | break; | |
5d4f98a2 | 2310 | if (ref->action == action) |
56bec294 CM |
2311 | return ref; |
2312 | node = rb_prev(node); | |
2313 | } | |
2314 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2315 | action = BTRFS_DROP_DELAYED_REF; | |
2316 | goto again; | |
2317 | } | |
2318 | return NULL; | |
2319 | } | |
2320 | ||
79787eaa JM |
2321 | /* |
2322 | * Returns 0 on success or if called with an already aborted transaction. | |
2323 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2324 | */ | |
c3e69d58 CM |
2325 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2326 | struct btrfs_root *root, | |
2327 | struct list_head *cluster) | |
56bec294 | 2328 | { |
56bec294 CM |
2329 | struct btrfs_delayed_ref_root *delayed_refs; |
2330 | struct btrfs_delayed_ref_node *ref; | |
2331 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2332 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2333 | struct btrfs_fs_info *fs_info = root->fs_info; |
56bec294 | 2334 | int ret; |
c3e69d58 | 2335 | int count = 0; |
56bec294 | 2336 | int must_insert_reserved = 0; |
56bec294 CM |
2337 | |
2338 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2339 | while (1) { |
2340 | if (!locked_ref) { | |
c3e69d58 CM |
2341 | /* pick a new head ref from the cluster list */ |
2342 | if (list_empty(cluster)) | |
56bec294 | 2343 | break; |
56bec294 | 2344 | |
c3e69d58 CM |
2345 | locked_ref = list_entry(cluster->next, |
2346 | struct btrfs_delayed_ref_head, cluster); | |
2347 | ||
2348 | /* grab the lock that says we are going to process | |
2349 | * all the refs for this head */ | |
2350 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2351 | ||
2352 | /* | |
2353 | * we may have dropped the spin lock to get the head | |
2354 | * mutex lock, and that might have given someone else | |
2355 | * time to free the head. If that's true, it has been | |
2356 | * removed from our list and we can move on. | |
2357 | */ | |
2358 | if (ret == -EAGAIN) { | |
2359 | locked_ref = NULL; | |
2360 | count++; | |
2361 | continue; | |
56bec294 CM |
2362 | } |
2363 | } | |
a28ec197 | 2364 | |
ae1e206b JB |
2365 | /* |
2366 | * We need to try and merge add/drops of the same ref since we | |
2367 | * can run into issues with relocate dropping the implicit ref | |
2368 | * and then it being added back again before the drop can | |
2369 | * finish. If we merged anything we need to re-loop so we can | |
2370 | * get a good ref. | |
2371 | */ | |
2372 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, | |
2373 | locked_ref); | |
2374 | ||
d1270cd9 AJ |
2375 | /* |
2376 | * locked_ref is the head node, so we have to go one | |
2377 | * node back for any delayed ref updates | |
2378 | */ | |
2379 | ref = select_delayed_ref(locked_ref); | |
2380 | ||
2381 | if (ref && ref->seq && | |
097b8a7c | 2382 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d1270cd9 AJ |
2383 | /* |
2384 | * there are still refs with lower seq numbers in the | |
2385 | * process of being added. Don't run this ref yet. | |
2386 | */ | |
2387 | list_del_init(&locked_ref->cluster); | |
093486c4 | 2388 | btrfs_delayed_ref_unlock(locked_ref); |
d1270cd9 AJ |
2389 | locked_ref = NULL; |
2390 | delayed_refs->num_heads_ready++; | |
2391 | spin_unlock(&delayed_refs->lock); | |
2392 | cond_resched(); | |
2393 | spin_lock(&delayed_refs->lock); | |
2394 | continue; | |
2395 | } | |
2396 | ||
56bec294 CM |
2397 | /* |
2398 | * record the must insert reserved flag before we | |
2399 | * drop the spin lock. | |
2400 | */ | |
2401 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2402 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2403 | |
5d4f98a2 YZ |
2404 | extent_op = locked_ref->extent_op; |
2405 | locked_ref->extent_op = NULL; | |
2406 | ||
56bec294 CM |
2407 | if (!ref) { |
2408 | /* All delayed refs have been processed, Go ahead | |
2409 | * and send the head node to run_one_delayed_ref, | |
2410 | * so that any accounting fixes can happen | |
2411 | */ | |
2412 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2413 | |
2414 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2415 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2416 | extent_op = NULL; |
2417 | } | |
2418 | ||
2419 | if (extent_op) { | |
2420 | spin_unlock(&delayed_refs->lock); | |
2421 | ||
2422 | ret = run_delayed_extent_op(trans, root, | |
2423 | ref, extent_op); | |
78a6184a | 2424 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2425 | |
79787eaa | 2426 | if (ret) { |
c2cf52eb | 2427 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
253beebd | 2428 | spin_lock(&delayed_refs->lock); |
093486c4 | 2429 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2430 | return ret; |
2431 | } | |
2432 | ||
203bf287 | 2433 | goto next; |
5d4f98a2 | 2434 | } |
56bec294 | 2435 | } |
02217ed2 | 2436 | |
56bec294 CM |
2437 | ref->in_tree = 0; |
2438 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2439 | delayed_refs->num_entries--; | |
093486c4 | 2440 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2441 | /* |
2442 | * when we play the delayed ref, also correct the | |
2443 | * ref_mod on head | |
2444 | */ | |
2445 | switch (ref->action) { | |
2446 | case BTRFS_ADD_DELAYED_REF: | |
2447 | case BTRFS_ADD_DELAYED_EXTENT: | |
2448 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2449 | break; | |
2450 | case BTRFS_DROP_DELAYED_REF: | |
2451 | locked_ref->node.ref_mod += ref->ref_mod; | |
2452 | break; | |
2453 | default: | |
2454 | WARN_ON(1); | |
2455 | } | |
2456 | } | |
56bec294 | 2457 | spin_unlock(&delayed_refs->lock); |
925baedd | 2458 | |
5d4f98a2 | 2459 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2460 | must_insert_reserved); |
eb099670 | 2461 | |
78a6184a | 2462 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2463 | if (ret) { |
093486c4 MX |
2464 | btrfs_delayed_ref_unlock(locked_ref); |
2465 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2466 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
253beebd | 2467 | spin_lock(&delayed_refs->lock); |
79787eaa JM |
2468 | return ret; |
2469 | } | |
2470 | ||
093486c4 MX |
2471 | /* |
2472 | * If this node is a head, that means all the refs in this head | |
2473 | * have been dealt with, and we will pick the next head to deal | |
2474 | * with, so we must unlock the head and drop it from the cluster | |
2475 | * list before we release it. | |
2476 | */ | |
2477 | if (btrfs_delayed_ref_is_head(ref)) { | |
2478 | list_del_init(&locked_ref->cluster); | |
2479 | btrfs_delayed_ref_unlock(locked_ref); | |
2480 | locked_ref = NULL; | |
2481 | } | |
2482 | btrfs_put_delayed_ref(ref); | |
2483 | count++; | |
203bf287 | 2484 | next: |
c3e69d58 CM |
2485 | cond_resched(); |
2486 | spin_lock(&delayed_refs->lock); | |
2487 | } | |
2488 | return count; | |
2489 | } | |
2490 | ||
709c0486 AJ |
2491 | #ifdef SCRAMBLE_DELAYED_REFS |
2492 | /* | |
2493 | * Normally delayed refs get processed in ascending bytenr order. This | |
2494 | * correlates in most cases to the order added. To expose dependencies on this | |
2495 | * order, we start to process the tree in the middle instead of the beginning | |
2496 | */ | |
2497 | static u64 find_middle(struct rb_root *root) | |
2498 | { | |
2499 | struct rb_node *n = root->rb_node; | |
2500 | struct btrfs_delayed_ref_node *entry; | |
2501 | int alt = 1; | |
2502 | u64 middle; | |
2503 | u64 first = 0, last = 0; | |
2504 | ||
2505 | n = rb_first(root); | |
2506 | if (n) { | |
2507 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2508 | first = entry->bytenr; | |
2509 | } | |
2510 | n = rb_last(root); | |
2511 | if (n) { | |
2512 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2513 | last = entry->bytenr; | |
2514 | } | |
2515 | n = root->rb_node; | |
2516 | ||
2517 | while (n) { | |
2518 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2519 | WARN_ON(!entry->in_tree); | |
2520 | ||
2521 | middle = entry->bytenr; | |
2522 | ||
2523 | if (alt) | |
2524 | n = n->rb_left; | |
2525 | else | |
2526 | n = n->rb_right; | |
2527 | ||
2528 | alt = 1 - alt; | |
2529 | } | |
2530 | return middle; | |
2531 | } | |
2532 | #endif | |
2533 | ||
bed92eae AJ |
2534 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2535 | struct btrfs_fs_info *fs_info) | |
2536 | { | |
2537 | struct qgroup_update *qgroup_update; | |
2538 | int ret = 0; | |
2539 | ||
2540 | if (list_empty(&trans->qgroup_ref_list) != | |
2541 | !trans->delayed_ref_elem.seq) { | |
2542 | /* list without seq or seq without list */ | |
c2cf52eb | 2543 | btrfs_err(fs_info, |
fc36ed7e | 2544 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
bed92eae | 2545 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2546 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2547 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2548 | BUG(); |
2549 | } | |
2550 | ||
2551 | if (!trans->delayed_ref_elem.seq) | |
2552 | return 0; | |
2553 | ||
2554 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2555 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2556 | struct qgroup_update, list); | |
2557 | list_del(&qgroup_update->list); | |
2558 | if (!ret) | |
2559 | ret = btrfs_qgroup_account_ref( | |
2560 | trans, fs_info, qgroup_update->node, | |
2561 | qgroup_update->extent_op); | |
2562 | kfree(qgroup_update); | |
2563 | } | |
2564 | ||
2565 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2566 | ||
2567 | return ret; | |
2568 | } | |
2569 | ||
bb721703 CM |
2570 | static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq, |
2571 | int count) | |
2572 | { | |
2573 | int val = atomic_read(&delayed_refs->ref_seq); | |
2574 | ||
2575 | if (val < seq || val >= seq + count) | |
2576 | return 1; | |
2577 | return 0; | |
2578 | } | |
2579 | ||
c3e69d58 CM |
2580 | /* |
2581 | * this starts processing the delayed reference count updates and | |
2582 | * extent insertions we have queued up so far. count can be | |
2583 | * 0, which means to process everything in the tree at the start | |
2584 | * of the run (but not newly added entries), or it can be some target | |
2585 | * number you'd like to process. | |
79787eaa JM |
2586 | * |
2587 | * Returns 0 on success or if called with an aborted transaction | |
2588 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2589 | */ |
2590 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2591 | struct btrfs_root *root, unsigned long count) | |
2592 | { | |
2593 | struct rb_node *node; | |
2594 | struct btrfs_delayed_ref_root *delayed_refs; | |
2595 | struct btrfs_delayed_ref_node *ref; | |
2596 | struct list_head cluster; | |
2597 | int ret; | |
a168650c | 2598 | u64 delayed_start; |
c3e69d58 CM |
2599 | int run_all = count == (unsigned long)-1; |
2600 | int run_most = 0; | |
1fa11e26 | 2601 | int loops; |
c3e69d58 | 2602 | |
79787eaa JM |
2603 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2604 | if (trans->aborted) | |
2605 | return 0; | |
2606 | ||
c3e69d58 CM |
2607 | if (root == root->fs_info->extent_root) |
2608 | root = root->fs_info->tree_root; | |
2609 | ||
edf39272 JS |
2610 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2611 | ||
c3e69d58 CM |
2612 | delayed_refs = &trans->transaction->delayed_refs; |
2613 | INIT_LIST_HEAD(&cluster); | |
bb721703 CM |
2614 | if (count == 0) { |
2615 | count = delayed_refs->num_entries * 2; | |
2616 | run_most = 1; | |
2617 | } | |
2618 | ||
2619 | if (!run_all && !run_most) { | |
2620 | int old; | |
2621 | int seq = atomic_read(&delayed_refs->ref_seq); | |
2622 | ||
2623 | progress: | |
2624 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2625 | if (old) { | |
2626 | DEFINE_WAIT(__wait); | |
2627 | if (delayed_refs->num_entries < 16348) | |
2628 | return 0; | |
2629 | ||
2630 | prepare_to_wait(&delayed_refs->wait, &__wait, | |
2631 | TASK_UNINTERRUPTIBLE); | |
2632 | ||
2633 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2634 | if (old) { | |
2635 | schedule(); | |
2636 | finish_wait(&delayed_refs->wait, &__wait); | |
2637 | ||
2638 | if (!refs_newer(delayed_refs, seq, 256)) | |
2639 | goto progress; | |
2640 | else | |
2641 | return 0; | |
2642 | } else { | |
2643 | finish_wait(&delayed_refs->wait, &__wait); | |
2644 | goto again; | |
2645 | } | |
2646 | } | |
2647 | ||
2648 | } else { | |
2649 | atomic_inc(&delayed_refs->procs_running_refs); | |
2650 | } | |
2651 | ||
c3e69d58 | 2652 | again: |
1fa11e26 | 2653 | loops = 0; |
c3e69d58 | 2654 | spin_lock(&delayed_refs->lock); |
097b8a7c | 2655 | |
709c0486 AJ |
2656 | #ifdef SCRAMBLE_DELAYED_REFS |
2657 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2658 | #endif | |
2659 | ||
c3e69d58 CM |
2660 | while (1) { |
2661 | if (!(run_all || run_most) && | |
2662 | delayed_refs->num_heads_ready < 64) | |
2663 | break; | |
eb099670 | 2664 | |
56bec294 | 2665 | /* |
c3e69d58 CM |
2666 | * go find something we can process in the rbtree. We start at |
2667 | * the beginning of the tree, and then build a cluster | |
2668 | * of refs to process starting at the first one we are able to | |
2669 | * lock | |
56bec294 | 2670 | */ |
a168650c | 2671 | delayed_start = delayed_refs->run_delayed_start; |
c3e69d58 CM |
2672 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2673 | delayed_refs->run_delayed_start); | |
2674 | if (ret) | |
56bec294 CM |
2675 | break; |
2676 | ||
c3e69d58 | 2677 | ret = run_clustered_refs(trans, root, &cluster); |
79787eaa | 2678 | if (ret < 0) { |
093486c4 | 2679 | btrfs_release_ref_cluster(&cluster); |
79787eaa JM |
2680 | spin_unlock(&delayed_refs->lock); |
2681 | btrfs_abort_transaction(trans, root, ret); | |
bb721703 | 2682 | atomic_dec(&delayed_refs->procs_running_refs); |
79787eaa JM |
2683 | return ret; |
2684 | } | |
c3e69d58 | 2685 | |
bb721703 CM |
2686 | atomic_add(ret, &delayed_refs->ref_seq); |
2687 | ||
c3e69d58 CM |
2688 | count -= min_t(unsigned long, ret, count); |
2689 | ||
2690 | if (count == 0) | |
2691 | break; | |
a168650c | 2692 | |
1fa11e26 AJ |
2693 | if (delayed_start >= delayed_refs->run_delayed_start) { |
2694 | if (loops == 0) { | |
2695 | /* | |
2696 | * btrfs_find_ref_cluster looped. let's do one | |
2697 | * more cycle. if we don't run any delayed ref | |
2698 | * during that cycle (because we can't because | |
2699 | * all of them are blocked), bail out. | |
2700 | */ | |
2701 | loops = 1; | |
2702 | } else { | |
2703 | /* | |
2704 | * no runnable refs left, stop trying | |
2705 | */ | |
2706 | BUG_ON(run_all); | |
2707 | break; | |
2708 | } | |
2709 | } | |
2710 | if (ret) { | |
a168650c | 2711 | /* refs were run, let's reset staleness detection */ |
1fa11e26 | 2712 | loops = 0; |
a168650c | 2713 | } |
eb099670 | 2714 | } |
c3e69d58 | 2715 | |
56bec294 | 2716 | if (run_all) { |
ea658bad JB |
2717 | if (!list_empty(&trans->new_bgs)) { |
2718 | spin_unlock(&delayed_refs->lock); | |
2719 | btrfs_create_pending_block_groups(trans, root); | |
2720 | spin_lock(&delayed_refs->lock); | |
2721 | } | |
2722 | ||
56bec294 | 2723 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2724 | if (!node) |
56bec294 | 2725 | goto out; |
c3e69d58 | 2726 | count = (unsigned long)-1; |
e9d0b13b | 2727 | |
56bec294 CM |
2728 | while (node) { |
2729 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2730 | rb_node); | |
2731 | if (btrfs_delayed_ref_is_head(ref)) { | |
2732 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2733 | |
56bec294 CM |
2734 | head = btrfs_delayed_node_to_head(ref); |
2735 | atomic_inc(&ref->refs); | |
2736 | ||
2737 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2738 | /* |
2739 | * Mutex was contended, block until it's | |
2740 | * released and try again | |
2741 | */ | |
56bec294 CM |
2742 | mutex_lock(&head->mutex); |
2743 | mutex_unlock(&head->mutex); | |
2744 | ||
2745 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2746 | cond_resched(); |
56bec294 CM |
2747 | goto again; |
2748 | } | |
2749 | node = rb_next(node); | |
2750 | } | |
2751 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2752 | schedule_timeout(1); |
2753 | goto again; | |
5f39d397 | 2754 | } |
54aa1f4d | 2755 | out: |
bb721703 CM |
2756 | atomic_dec(&delayed_refs->procs_running_refs); |
2757 | smp_mb(); | |
2758 | if (waitqueue_active(&delayed_refs->wait)) | |
2759 | wake_up(&delayed_refs->wait); | |
2760 | ||
c3e69d58 | 2761 | spin_unlock(&delayed_refs->lock); |
edf39272 | 2762 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2763 | return 0; |
2764 | } | |
2765 | ||
5d4f98a2 YZ |
2766 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2767 | struct btrfs_root *root, | |
2768 | u64 bytenr, u64 num_bytes, u64 flags, | |
2769 | int is_data) | |
2770 | { | |
2771 | struct btrfs_delayed_extent_op *extent_op; | |
2772 | int ret; | |
2773 | ||
78a6184a | 2774 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2775 | if (!extent_op) |
2776 | return -ENOMEM; | |
2777 | ||
2778 | extent_op->flags_to_set = flags; | |
2779 | extent_op->update_flags = 1; | |
2780 | extent_op->update_key = 0; | |
2781 | extent_op->is_data = is_data ? 1 : 0; | |
2782 | ||
66d7e7f0 AJ |
2783 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2784 | num_bytes, extent_op); | |
5d4f98a2 | 2785 | if (ret) |
78a6184a | 2786 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2787 | return ret; |
2788 | } | |
2789 | ||
2790 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2791 | struct btrfs_root *root, | |
2792 | struct btrfs_path *path, | |
2793 | u64 objectid, u64 offset, u64 bytenr) | |
2794 | { | |
2795 | struct btrfs_delayed_ref_head *head; | |
2796 | struct btrfs_delayed_ref_node *ref; | |
2797 | struct btrfs_delayed_data_ref *data_ref; | |
2798 | struct btrfs_delayed_ref_root *delayed_refs; | |
2799 | struct rb_node *node; | |
2800 | int ret = 0; | |
2801 | ||
2802 | ret = -ENOENT; | |
2803 | delayed_refs = &trans->transaction->delayed_refs; | |
2804 | spin_lock(&delayed_refs->lock); | |
2805 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2806 | if (!head) | |
2807 | goto out; | |
2808 | ||
2809 | if (!mutex_trylock(&head->mutex)) { | |
2810 | atomic_inc(&head->node.refs); | |
2811 | spin_unlock(&delayed_refs->lock); | |
2812 | ||
b3b4aa74 | 2813 | btrfs_release_path(path); |
5d4f98a2 | 2814 | |
8cc33e5c DS |
2815 | /* |
2816 | * Mutex was contended, block until it's released and let | |
2817 | * caller try again | |
2818 | */ | |
5d4f98a2 YZ |
2819 | mutex_lock(&head->mutex); |
2820 | mutex_unlock(&head->mutex); | |
2821 | btrfs_put_delayed_ref(&head->node); | |
2822 | return -EAGAIN; | |
2823 | } | |
2824 | ||
2825 | node = rb_prev(&head->node.rb_node); | |
2826 | if (!node) | |
2827 | goto out_unlock; | |
2828 | ||
2829 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2830 | ||
2831 | if (ref->bytenr != bytenr) | |
2832 | goto out_unlock; | |
2833 | ||
2834 | ret = 1; | |
2835 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2836 | goto out_unlock; | |
2837 | ||
2838 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2839 | ||
2840 | node = rb_prev(node); | |
2841 | if (node) { | |
df57dbe6 LB |
2842 | int seq = ref->seq; |
2843 | ||
5d4f98a2 | 2844 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
df57dbe6 | 2845 | if (ref->bytenr == bytenr && ref->seq == seq) |
5d4f98a2 YZ |
2846 | goto out_unlock; |
2847 | } | |
2848 | ||
2849 | if (data_ref->root != root->root_key.objectid || | |
2850 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2851 | goto out_unlock; | |
2852 | ||
2853 | ret = 0; | |
2854 | out_unlock: | |
2855 | mutex_unlock(&head->mutex); | |
2856 | out: | |
2857 | spin_unlock(&delayed_refs->lock); | |
2858 | return ret; | |
2859 | } | |
2860 | ||
2861 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2862 | struct btrfs_root *root, | |
2863 | struct btrfs_path *path, | |
2864 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2865 | { |
2866 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2867 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2868 | struct btrfs_extent_data_ref *ref; |
2869 | struct btrfs_extent_inline_ref *iref; | |
2870 | struct btrfs_extent_item *ei; | |
f321e491 | 2871 | struct btrfs_key key; |
5d4f98a2 | 2872 | u32 item_size; |
be20aa9d | 2873 | int ret; |
925baedd | 2874 | |
be20aa9d | 2875 | key.objectid = bytenr; |
31840ae1 | 2876 | key.offset = (u64)-1; |
f321e491 | 2877 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2878 | |
be20aa9d CM |
2879 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2880 | if (ret < 0) | |
2881 | goto out; | |
79787eaa | 2882 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2883 | |
2884 | ret = -ENOENT; | |
2885 | if (path->slots[0] == 0) | |
31840ae1 | 2886 | goto out; |
be20aa9d | 2887 | |
31840ae1 | 2888 | path->slots[0]--; |
f321e491 | 2889 | leaf = path->nodes[0]; |
5d4f98a2 | 2890 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2891 | |
5d4f98a2 | 2892 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2893 | goto out; |
f321e491 | 2894 | |
5d4f98a2 YZ |
2895 | ret = 1; |
2896 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2897 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2898 | if (item_size < sizeof(*ei)) { | |
2899 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2900 | goto out; | |
2901 | } | |
2902 | #endif | |
2903 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2904 | |
5d4f98a2 YZ |
2905 | if (item_size != sizeof(*ei) + |
2906 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2907 | goto out; | |
be20aa9d | 2908 | |
5d4f98a2 YZ |
2909 | if (btrfs_extent_generation(leaf, ei) <= |
2910 | btrfs_root_last_snapshot(&root->root_item)) | |
2911 | goto out; | |
2912 | ||
2913 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2914 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2915 | BTRFS_EXTENT_DATA_REF_KEY) | |
2916 | goto out; | |
2917 | ||
2918 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2919 | if (btrfs_extent_refs(leaf, ei) != | |
2920 | btrfs_extent_data_ref_count(leaf, ref) || | |
2921 | btrfs_extent_data_ref_root(leaf, ref) != | |
2922 | root->root_key.objectid || | |
2923 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2924 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2925 | goto out; | |
2926 | ||
2927 | ret = 0; | |
2928 | out: | |
2929 | return ret; | |
2930 | } | |
2931 | ||
2932 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2933 | struct btrfs_root *root, | |
2934 | u64 objectid, u64 offset, u64 bytenr) | |
2935 | { | |
2936 | struct btrfs_path *path; | |
2937 | int ret; | |
2938 | int ret2; | |
2939 | ||
2940 | path = btrfs_alloc_path(); | |
2941 | if (!path) | |
2942 | return -ENOENT; | |
2943 | ||
2944 | do { | |
2945 | ret = check_committed_ref(trans, root, path, objectid, | |
2946 | offset, bytenr); | |
2947 | if (ret && ret != -ENOENT) | |
f321e491 | 2948 | goto out; |
80ff3856 | 2949 | |
5d4f98a2 YZ |
2950 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2951 | offset, bytenr); | |
2952 | } while (ret2 == -EAGAIN); | |
2953 | ||
2954 | if (ret2 && ret2 != -ENOENT) { | |
2955 | ret = ret2; | |
2956 | goto out; | |
f321e491 | 2957 | } |
5d4f98a2 YZ |
2958 | |
2959 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2960 | ret = 0; | |
be20aa9d | 2961 | out: |
80ff3856 | 2962 | btrfs_free_path(path); |
f0486c68 YZ |
2963 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2964 | WARN_ON(ret > 0); | |
f321e491 | 2965 | return ret; |
be20aa9d | 2966 | } |
c5739bba | 2967 | |
5d4f98a2 | 2968 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2969 | struct btrfs_root *root, |
5d4f98a2 | 2970 | struct extent_buffer *buf, |
66d7e7f0 | 2971 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2972 | { |
2973 | u64 bytenr; | |
5d4f98a2 YZ |
2974 | u64 num_bytes; |
2975 | u64 parent; | |
31840ae1 | 2976 | u64 ref_root; |
31840ae1 | 2977 | u32 nritems; |
31840ae1 ZY |
2978 | struct btrfs_key key; |
2979 | struct btrfs_file_extent_item *fi; | |
2980 | int i; | |
2981 | int level; | |
2982 | int ret = 0; | |
31840ae1 | 2983 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2984 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2985 | |
2986 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2987 | nritems = btrfs_header_nritems(buf); |
2988 | level = btrfs_header_level(buf); | |
2989 | ||
5d4f98a2 YZ |
2990 | if (!root->ref_cows && level == 0) |
2991 | return 0; | |
31840ae1 | 2992 | |
5d4f98a2 YZ |
2993 | if (inc) |
2994 | process_func = btrfs_inc_extent_ref; | |
2995 | else | |
2996 | process_func = btrfs_free_extent; | |
31840ae1 | 2997 | |
5d4f98a2 YZ |
2998 | if (full_backref) |
2999 | parent = buf->start; | |
3000 | else | |
3001 | parent = 0; | |
3002 | ||
3003 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3004 | if (level == 0) { |
5d4f98a2 | 3005 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
3006 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
3007 | continue; | |
5d4f98a2 | 3008 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3009 | struct btrfs_file_extent_item); |
3010 | if (btrfs_file_extent_type(buf, fi) == | |
3011 | BTRFS_FILE_EXTENT_INLINE) | |
3012 | continue; | |
3013 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3014 | if (bytenr == 0) | |
3015 | continue; | |
5d4f98a2 YZ |
3016 | |
3017 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3018 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3019 | ret = process_func(trans, root, bytenr, num_bytes, | |
3020 | parent, ref_root, key.objectid, | |
66d7e7f0 | 3021 | key.offset, for_cow); |
31840ae1 ZY |
3022 | if (ret) |
3023 | goto fail; | |
3024 | } else { | |
5d4f98a2 YZ |
3025 | bytenr = btrfs_node_blockptr(buf, i); |
3026 | num_bytes = btrfs_level_size(root, level - 1); | |
3027 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
3028 | parent, ref_root, level - 1, 0, |
3029 | for_cow); | |
31840ae1 ZY |
3030 | if (ret) |
3031 | goto fail; | |
3032 | } | |
3033 | } | |
3034 | return 0; | |
3035 | fail: | |
5d4f98a2 YZ |
3036 | return ret; |
3037 | } | |
3038 | ||
3039 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3040 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3041 | { |
66d7e7f0 | 3042 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
3043 | } |
3044 | ||
3045 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3046 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3047 | { |
66d7e7f0 | 3048 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
3049 | } |
3050 | ||
9078a3e1 CM |
3051 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3052 | struct btrfs_root *root, | |
3053 | struct btrfs_path *path, | |
3054 | struct btrfs_block_group_cache *cache) | |
3055 | { | |
3056 | int ret; | |
9078a3e1 | 3057 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3058 | unsigned long bi; |
3059 | struct extent_buffer *leaf; | |
9078a3e1 | 3060 | |
9078a3e1 | 3061 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
3062 | if (ret < 0) |
3063 | goto fail; | |
79787eaa | 3064 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
3065 | |
3066 | leaf = path->nodes[0]; | |
3067 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3068 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3069 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3070 | btrfs_release_path(path); |
54aa1f4d | 3071 | fail: |
79787eaa JM |
3072 | if (ret) { |
3073 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 3074 | return ret; |
79787eaa | 3075 | } |
9078a3e1 CM |
3076 | return 0; |
3077 | ||
3078 | } | |
3079 | ||
4a8c9a62 YZ |
3080 | static struct btrfs_block_group_cache * |
3081 | next_block_group(struct btrfs_root *root, | |
3082 | struct btrfs_block_group_cache *cache) | |
3083 | { | |
3084 | struct rb_node *node; | |
3085 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3086 | node = rb_next(&cache->cache_node); | |
3087 | btrfs_put_block_group(cache); | |
3088 | if (node) { | |
3089 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3090 | cache_node); | |
11dfe35a | 3091 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3092 | } else |
3093 | cache = NULL; | |
3094 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3095 | return cache; | |
3096 | } | |
3097 | ||
0af3d00b JB |
3098 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3099 | struct btrfs_trans_handle *trans, | |
3100 | struct btrfs_path *path) | |
3101 | { | |
3102 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3103 | struct inode *inode = NULL; | |
3104 | u64 alloc_hint = 0; | |
2b20982e | 3105 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
3106 | int num_pages = 0; |
3107 | int retries = 0; | |
3108 | int ret = 0; | |
3109 | ||
3110 | /* | |
3111 | * If this block group is smaller than 100 megs don't bother caching the | |
3112 | * block group. | |
3113 | */ | |
3114 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3115 | spin_lock(&block_group->lock); | |
3116 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3117 | spin_unlock(&block_group->lock); | |
3118 | return 0; | |
3119 | } | |
3120 | ||
3121 | again: | |
3122 | inode = lookup_free_space_inode(root, block_group, path); | |
3123 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3124 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3125 | btrfs_release_path(path); |
0af3d00b JB |
3126 | goto out; |
3127 | } | |
3128 | ||
3129 | if (IS_ERR(inode)) { | |
3130 | BUG_ON(retries); | |
3131 | retries++; | |
3132 | ||
3133 | if (block_group->ro) | |
3134 | goto out_free; | |
3135 | ||
3136 | ret = create_free_space_inode(root, trans, block_group, path); | |
3137 | if (ret) | |
3138 | goto out_free; | |
3139 | goto again; | |
3140 | } | |
3141 | ||
5b0e95bf JB |
3142 | /* We've already setup this transaction, go ahead and exit */ |
3143 | if (block_group->cache_generation == trans->transid && | |
3144 | i_size_read(inode)) { | |
3145 | dcs = BTRFS_DC_SETUP; | |
3146 | goto out_put; | |
3147 | } | |
3148 | ||
0af3d00b JB |
3149 | /* |
3150 | * We want to set the generation to 0, that way if anything goes wrong | |
3151 | * from here on out we know not to trust this cache when we load up next | |
3152 | * time. | |
3153 | */ | |
3154 | BTRFS_I(inode)->generation = 0; | |
3155 | ret = btrfs_update_inode(trans, root, inode); | |
3156 | WARN_ON(ret); | |
3157 | ||
3158 | if (i_size_read(inode) > 0) { | |
3159 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
3160 | inode); | |
3161 | if (ret) | |
3162 | goto out_put; | |
3163 | } | |
3164 | ||
3165 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3166 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3167 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3168 | /* | |
3169 | * don't bother trying to write stuff out _if_ | |
3170 | * a) we're not cached, | |
3171 | * b) we're with nospace_cache mount option. | |
3172 | */ | |
2b20982e | 3173 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3174 | spin_unlock(&block_group->lock); |
3175 | goto out_put; | |
3176 | } | |
3177 | spin_unlock(&block_group->lock); | |
3178 | ||
6fc823b1 JB |
3179 | /* |
3180 | * Try to preallocate enough space based on how big the block group is. | |
3181 | * Keep in mind this has to include any pinned space which could end up | |
3182 | * taking up quite a bit since it's not folded into the other space | |
3183 | * cache. | |
3184 | */ | |
3185 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3186 | if (!num_pages) |
3187 | num_pages = 1; | |
3188 | ||
0af3d00b JB |
3189 | num_pages *= 16; |
3190 | num_pages *= PAGE_CACHE_SIZE; | |
3191 | ||
3192 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3193 | if (ret) | |
3194 | goto out_put; | |
3195 | ||
3196 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3197 | num_pages, num_pages, | |
3198 | &alloc_hint); | |
2b20982e JB |
3199 | if (!ret) |
3200 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3201 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3202 | |
0af3d00b JB |
3203 | out_put: |
3204 | iput(inode); | |
3205 | out_free: | |
b3b4aa74 | 3206 | btrfs_release_path(path); |
0af3d00b JB |
3207 | out: |
3208 | spin_lock(&block_group->lock); | |
e65cbb94 | 3209 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3210 | block_group->cache_generation = trans->transid; |
2b20982e | 3211 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3212 | spin_unlock(&block_group->lock); |
3213 | ||
3214 | return ret; | |
3215 | } | |
3216 | ||
96b5179d CM |
3217 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3218 | struct btrfs_root *root) | |
9078a3e1 | 3219 | { |
4a8c9a62 | 3220 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3221 | int err = 0; |
9078a3e1 | 3222 | struct btrfs_path *path; |
96b5179d | 3223 | u64 last = 0; |
9078a3e1 CM |
3224 | |
3225 | path = btrfs_alloc_path(); | |
3226 | if (!path) | |
3227 | return -ENOMEM; | |
3228 | ||
0af3d00b JB |
3229 | again: |
3230 | while (1) { | |
3231 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3232 | while (cache) { | |
3233 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3234 | break; | |
3235 | cache = next_block_group(root, cache); | |
3236 | } | |
3237 | if (!cache) { | |
3238 | if (last == 0) | |
3239 | break; | |
3240 | last = 0; | |
3241 | continue; | |
3242 | } | |
3243 | err = cache_save_setup(cache, trans, path); | |
3244 | last = cache->key.objectid + cache->key.offset; | |
3245 | btrfs_put_block_group(cache); | |
3246 | } | |
3247 | ||
d397712b | 3248 | while (1) { |
4a8c9a62 YZ |
3249 | if (last == 0) { |
3250 | err = btrfs_run_delayed_refs(trans, root, | |
3251 | (unsigned long)-1); | |
79787eaa JM |
3252 | if (err) /* File system offline */ |
3253 | goto out; | |
0f9dd46c | 3254 | } |
54aa1f4d | 3255 | |
4a8c9a62 YZ |
3256 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3257 | while (cache) { | |
0af3d00b JB |
3258 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3259 | btrfs_put_block_group(cache); | |
3260 | goto again; | |
3261 | } | |
3262 | ||
4a8c9a62 YZ |
3263 | if (cache->dirty) |
3264 | break; | |
3265 | cache = next_block_group(root, cache); | |
3266 | } | |
3267 | if (!cache) { | |
3268 | if (last == 0) | |
3269 | break; | |
3270 | last = 0; | |
3271 | continue; | |
3272 | } | |
0f9dd46c | 3273 | |
0cb59c99 JB |
3274 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3275 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3276 | cache->dirty = 0; |
4a8c9a62 | 3277 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3278 | |
4a8c9a62 | 3279 | err = write_one_cache_group(trans, root, path, cache); |
79787eaa JM |
3280 | if (err) /* File system offline */ |
3281 | goto out; | |
3282 | ||
4a8c9a62 | 3283 | btrfs_put_block_group(cache); |
9078a3e1 | 3284 | } |
4a8c9a62 | 3285 | |
0cb59c99 JB |
3286 | while (1) { |
3287 | /* | |
3288 | * I don't think this is needed since we're just marking our | |
3289 | * preallocated extent as written, but just in case it can't | |
3290 | * hurt. | |
3291 | */ | |
3292 | if (last == 0) { | |
3293 | err = btrfs_run_delayed_refs(trans, root, | |
3294 | (unsigned long)-1); | |
79787eaa JM |
3295 | if (err) /* File system offline */ |
3296 | goto out; | |
0cb59c99 JB |
3297 | } |
3298 | ||
3299 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3300 | while (cache) { | |
3301 | /* | |
3302 | * Really this shouldn't happen, but it could if we | |
3303 | * couldn't write the entire preallocated extent and | |
3304 | * splitting the extent resulted in a new block. | |
3305 | */ | |
3306 | if (cache->dirty) { | |
3307 | btrfs_put_block_group(cache); | |
3308 | goto again; | |
3309 | } | |
3310 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3311 | break; | |
3312 | cache = next_block_group(root, cache); | |
3313 | } | |
3314 | if (!cache) { | |
3315 | if (last == 0) | |
3316 | break; | |
3317 | last = 0; | |
3318 | continue; | |
3319 | } | |
3320 | ||
79787eaa | 3321 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3322 | |
3323 | /* | |
3324 | * If we didn't have an error then the cache state is still | |
3325 | * NEED_WRITE, so we can set it to WRITTEN. | |
3326 | */ | |
79787eaa | 3327 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3328 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3329 | last = cache->key.objectid + cache->key.offset; | |
3330 | btrfs_put_block_group(cache); | |
3331 | } | |
79787eaa | 3332 | out: |
0cb59c99 | 3333 | |
9078a3e1 | 3334 | btrfs_free_path(path); |
79787eaa | 3335 | return err; |
9078a3e1 CM |
3336 | } |
3337 | ||
d2fb3437 YZ |
3338 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3339 | { | |
3340 | struct btrfs_block_group_cache *block_group; | |
3341 | int readonly = 0; | |
3342 | ||
3343 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3344 | if (!block_group || block_group->ro) | |
3345 | readonly = 1; | |
3346 | if (block_group) | |
fa9c0d79 | 3347 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3348 | return readonly; |
3349 | } | |
3350 | ||
593060d7 CM |
3351 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3352 | u64 total_bytes, u64 bytes_used, | |
3353 | struct btrfs_space_info **space_info) | |
3354 | { | |
3355 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3356 | int i; |
3357 | int factor; | |
3358 | ||
3359 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3360 | BTRFS_BLOCK_GROUP_RAID10)) | |
3361 | factor = 2; | |
3362 | else | |
3363 | factor = 1; | |
593060d7 CM |
3364 | |
3365 | found = __find_space_info(info, flags); | |
3366 | if (found) { | |
25179201 | 3367 | spin_lock(&found->lock); |
593060d7 | 3368 | found->total_bytes += total_bytes; |
89a55897 | 3369 | found->disk_total += total_bytes * factor; |
593060d7 | 3370 | found->bytes_used += bytes_used; |
b742bb82 | 3371 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3372 | found->full = 0; |
25179201 | 3373 | spin_unlock(&found->lock); |
593060d7 CM |
3374 | *space_info = found; |
3375 | return 0; | |
3376 | } | |
c146afad | 3377 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3378 | if (!found) |
3379 | return -ENOMEM; | |
3380 | ||
b742bb82 YZ |
3381 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3382 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3383 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3384 | spin_lock_init(&found->lock); |
52ba6929 | 3385 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3386 | found->total_bytes = total_bytes; |
89a55897 | 3387 | found->disk_total = total_bytes * factor; |
593060d7 | 3388 | found->bytes_used = bytes_used; |
b742bb82 | 3389 | found->disk_used = bytes_used * factor; |
593060d7 | 3390 | found->bytes_pinned = 0; |
e8569813 | 3391 | found->bytes_reserved = 0; |
c146afad | 3392 | found->bytes_readonly = 0; |
f0486c68 | 3393 | found->bytes_may_use = 0; |
593060d7 | 3394 | found->full = 0; |
0e4f8f88 | 3395 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3396 | found->chunk_alloc = 0; |
fdb5effd JB |
3397 | found->flush = 0; |
3398 | init_waitqueue_head(&found->wait); | |
593060d7 | 3399 | *space_info = found; |
4184ea7f | 3400 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3401 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3402 | info->data_sinfo = found; | |
593060d7 CM |
3403 | return 0; |
3404 | } | |
3405 | ||
8790d502 CM |
3406 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3407 | { | |
899c81ea ID |
3408 | u64 extra_flags = chunk_to_extended(flags) & |
3409 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3410 | |
de98ced9 | 3411 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3412 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3413 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3414 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3415 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3416 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3417 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3418 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3419 | } |
593060d7 | 3420 | |
fc67c450 ID |
3421 | /* |
3422 | * returns target flags in extended format or 0 if restripe for this | |
3423 | * chunk_type is not in progress | |
c6664b42 ID |
3424 | * |
3425 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3426 | */ |
3427 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3428 | { | |
3429 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3430 | u64 target = 0; | |
3431 | ||
fc67c450 ID |
3432 | if (!bctl) |
3433 | return 0; | |
3434 | ||
3435 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3436 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3437 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3438 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3439 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3440 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3441 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3442 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3443 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3444 | } | |
3445 | ||
3446 | return target; | |
3447 | } | |
3448 | ||
a46d11a8 ID |
3449 | /* |
3450 | * @flags: available profiles in extended format (see ctree.h) | |
3451 | * | |
e4d8ec0f ID |
3452 | * Returns reduced profile in chunk format. If profile changing is in |
3453 | * progress (either running or paused) picks the target profile (if it's | |
3454 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3455 | */ |
2b82032c | 3456 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3457 | { |
cd02dca5 CM |
3458 | /* |
3459 | * we add in the count of missing devices because we want | |
3460 | * to make sure that any RAID levels on a degraded FS | |
3461 | * continue to be honored. | |
3462 | */ | |
3463 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3464 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3465 | u64 target; |
53b381b3 | 3466 | u64 tmp; |
a061fc8d | 3467 | |
fc67c450 ID |
3468 | /* |
3469 | * see if restripe for this chunk_type is in progress, if so | |
3470 | * try to reduce to the target profile | |
3471 | */ | |
e4d8ec0f | 3472 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3473 | target = get_restripe_target(root->fs_info, flags); |
3474 | if (target) { | |
3475 | /* pick target profile only if it's already available */ | |
3476 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3477 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3478 | return extended_to_chunk(target); |
e4d8ec0f ID |
3479 | } |
3480 | } | |
3481 | spin_unlock(&root->fs_info->balance_lock); | |
3482 | ||
53b381b3 | 3483 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3484 | if (num_devices == 1) |
53b381b3 DW |
3485 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3486 | BTRFS_BLOCK_GROUP_RAID5); | |
3487 | if (num_devices < 3) | |
3488 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3489 | if (num_devices < 4) |
3490 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3491 | ||
53b381b3 DW |
3492 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3493 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3494 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3495 | flags &= ~tmp; | |
ec44a35c | 3496 | |
53b381b3 DW |
3497 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3498 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3499 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3500 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3501 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3502 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3503 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3504 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3505 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3506 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3507 | |
53b381b3 | 3508 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3509 | } |
3510 | ||
b742bb82 | 3511 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3512 | { |
de98ced9 MX |
3513 | unsigned seq; |
3514 | ||
3515 | do { | |
3516 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3517 | ||
3518 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3519 | flags |= root->fs_info->avail_data_alloc_bits; | |
3520 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3521 | flags |= root->fs_info->avail_system_alloc_bits; | |
3522 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3523 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3524 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3525 | |
b742bb82 | 3526 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3527 | } |
3528 | ||
6d07bcec | 3529 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3530 | { |
b742bb82 | 3531 | u64 flags; |
53b381b3 | 3532 | u64 ret; |
9ed74f2d | 3533 | |
b742bb82 YZ |
3534 | if (data) |
3535 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3536 | else if (root == root->fs_info->chunk_root) | |
3537 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3538 | else |
b742bb82 | 3539 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3540 | |
53b381b3 DW |
3541 | ret = get_alloc_profile(root, flags); |
3542 | return ret; | |
6a63209f | 3543 | } |
9ed74f2d | 3544 | |
6a63209f | 3545 | /* |
6a63209f JB |
3546 | * This will check the space that the inode allocates from to make sure we have |
3547 | * enough space for bytes. | |
6a63209f | 3548 | */ |
0ca1f7ce | 3549 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3550 | { |
6a63209f | 3551 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3552 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3553 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3554 | u64 used; |
0af3d00b | 3555 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3556 | |
6a63209f | 3557 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3558 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3559 | |
82d5902d LZ |
3560 | if (root == root->fs_info->tree_root || |
3561 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3562 | alloc_chunk = 0; |
3563 | committed = 1; | |
3564 | } | |
3565 | ||
b4d7c3c9 | 3566 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3567 | if (!data_sinfo) |
3568 | goto alloc; | |
9ed74f2d | 3569 | |
6a63209f JB |
3570 | again: |
3571 | /* make sure we have enough space to handle the data first */ | |
3572 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3573 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3574 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3575 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3576 | |
3577 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3578 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3579 | |
6a63209f JB |
3580 | /* |
3581 | * if we don't have enough free bytes in this space then we need | |
3582 | * to alloc a new chunk. | |
3583 | */ | |
0af3d00b | 3584 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3585 | u64 alloc_target; |
9ed74f2d | 3586 | |
0e4f8f88 | 3587 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3588 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3589 | alloc: |
6a63209f | 3590 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3591 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3592 | if (IS_ERR(trans)) |
3593 | return PTR_ERR(trans); | |
9ed74f2d | 3594 | |
6a63209f | 3595 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3596 | alloc_target, |
3597 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3598 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3599 | if (ret < 0) { |
3600 | if (ret != -ENOSPC) | |
3601 | return ret; | |
3602 | else | |
3603 | goto commit_trans; | |
3604 | } | |
9ed74f2d | 3605 | |
b4d7c3c9 LZ |
3606 | if (!data_sinfo) |
3607 | data_sinfo = fs_info->data_sinfo; | |
3608 | ||
6a63209f JB |
3609 | goto again; |
3610 | } | |
f2bb8f5c JB |
3611 | |
3612 | /* | |
3613 | * If we have less pinned bytes than we want to allocate then | |
3614 | * don't bother committing the transaction, it won't help us. | |
3615 | */ | |
3616 | if (data_sinfo->bytes_pinned < bytes) | |
3617 | committed = 1; | |
6a63209f | 3618 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3619 | |
4e06bdd6 | 3620 | /* commit the current transaction and try again */ |
d52a5b5f | 3621 | commit_trans: |
a4abeea4 JB |
3622 | if (!committed && |
3623 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3624 | committed = 1; |
7a7eaa40 | 3625 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3626 | if (IS_ERR(trans)) |
3627 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3628 | ret = btrfs_commit_transaction(trans, root); |
3629 | if (ret) | |
3630 | return ret; | |
3631 | goto again; | |
3632 | } | |
9ed74f2d | 3633 | |
6a63209f JB |
3634 | return -ENOSPC; |
3635 | } | |
3636 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3637 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3638 | data_sinfo->flags, bytes, 1); |
6a63209f | 3639 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3640 | |
9ed74f2d | 3641 | return 0; |
9ed74f2d | 3642 | } |
6a63209f | 3643 | |
6a63209f | 3644 | /* |
fb25e914 | 3645 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3646 | */ |
0ca1f7ce | 3647 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3648 | { |
0ca1f7ce | 3649 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3650 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3651 | |
6a63209f | 3652 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3653 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3654 | |
b4d7c3c9 | 3655 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f JB |
3656 | spin_lock(&data_sinfo->lock); |
3657 | data_sinfo->bytes_may_use -= bytes; | |
8c2a3ca2 | 3658 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3659 | data_sinfo->flags, bytes, 0); |
6a63209f | 3660 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3661 | } |
3662 | ||
97e728d4 | 3663 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3664 | { |
97e728d4 JB |
3665 | struct list_head *head = &info->space_info; |
3666 | struct btrfs_space_info *found; | |
e3ccfa98 | 3667 | |
97e728d4 JB |
3668 | rcu_read_lock(); |
3669 | list_for_each_entry_rcu(found, head, list) { | |
3670 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3671 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3672 | } |
97e728d4 | 3673 | rcu_read_unlock(); |
e3ccfa98 JB |
3674 | } |
3675 | ||
3c76cd84 MX |
3676 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
3677 | { | |
3678 | return (global->size << 1); | |
3679 | } | |
3680 | ||
e5bc2458 | 3681 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3682 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3683 | { |
fb25e914 | 3684 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3685 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3686 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3687 | u64 thresh; |
e3ccfa98 | 3688 | |
0e4f8f88 CM |
3689 | if (force == CHUNK_ALLOC_FORCE) |
3690 | return 1; | |
3691 | ||
fb25e914 JB |
3692 | /* |
3693 | * We need to take into account the global rsv because for all intents | |
3694 | * and purposes it's used space. Don't worry about locking the | |
3695 | * global_rsv, it doesn't change except when the transaction commits. | |
3696 | */ | |
54338b5c | 3697 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 3698 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 3699 | |
0e4f8f88 CM |
3700 | /* |
3701 | * in limited mode, we want to have some free space up to | |
3702 | * about 1% of the FS size. | |
3703 | */ | |
3704 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3705 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3706 | thresh = max_t(u64, 64 * 1024 * 1024, |
3707 | div_factor_fine(thresh, 1)); | |
3708 | ||
3709 | if (num_bytes - num_allocated < thresh) | |
3710 | return 1; | |
3711 | } | |
0e4f8f88 | 3712 | |
698d0082 | 3713 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3714 | return 0; |
424499db | 3715 | return 1; |
32c00aff JB |
3716 | } |
3717 | ||
15d1ff81 LB |
3718 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3719 | { | |
3720 | u64 num_dev; | |
3721 | ||
53b381b3 DW |
3722 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3723 | BTRFS_BLOCK_GROUP_RAID0 | | |
3724 | BTRFS_BLOCK_GROUP_RAID5 | | |
3725 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3726 | num_dev = root->fs_info->fs_devices->rw_devices; |
3727 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3728 | num_dev = 2; | |
3729 | else | |
3730 | num_dev = 1; /* DUP or single */ | |
3731 | ||
3732 | /* metadata for updaing devices and chunk tree */ | |
3733 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3734 | } | |
3735 | ||
3736 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3737 | struct btrfs_root *root, u64 type) | |
3738 | { | |
3739 | struct btrfs_space_info *info; | |
3740 | u64 left; | |
3741 | u64 thresh; | |
3742 | ||
3743 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3744 | spin_lock(&info->lock); | |
3745 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3746 | info->bytes_reserved - info->bytes_readonly; | |
3747 | spin_unlock(&info->lock); | |
3748 | ||
3749 | thresh = get_system_chunk_thresh(root, type); | |
3750 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
c2cf52eb SK |
3751 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
3752 | left, thresh, type); | |
15d1ff81 LB |
3753 | dump_space_info(info, 0, 0); |
3754 | } | |
3755 | ||
3756 | if (left < thresh) { | |
3757 | u64 flags; | |
3758 | ||
3759 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3760 | btrfs_alloc_chunk(trans, root, flags); | |
3761 | } | |
3762 | } | |
3763 | ||
6324fbf3 | 3764 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3765 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3766 | { |
6324fbf3 | 3767 | struct btrfs_space_info *space_info; |
97e728d4 | 3768 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3769 | int wait_for_alloc = 0; |
9ed74f2d | 3770 | int ret = 0; |
9ed74f2d | 3771 | |
c6b305a8 JB |
3772 | /* Don't re-enter if we're already allocating a chunk */ |
3773 | if (trans->allocating_chunk) | |
3774 | return -ENOSPC; | |
3775 | ||
6324fbf3 | 3776 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3777 | if (!space_info) { |
3778 | ret = update_space_info(extent_root->fs_info, flags, | |
3779 | 0, 0, &space_info); | |
79787eaa | 3780 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3781 | } |
79787eaa | 3782 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3783 | |
6d74119f | 3784 | again: |
25179201 | 3785 | spin_lock(&space_info->lock); |
9e622d6b | 3786 | if (force < space_info->force_alloc) |
0e4f8f88 | 3787 | force = space_info->force_alloc; |
25179201 JB |
3788 | if (space_info->full) { |
3789 | spin_unlock(&space_info->lock); | |
6d74119f | 3790 | return 0; |
9ed74f2d JB |
3791 | } |
3792 | ||
698d0082 | 3793 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3794 | spin_unlock(&space_info->lock); |
6d74119f JB |
3795 | return 0; |
3796 | } else if (space_info->chunk_alloc) { | |
3797 | wait_for_alloc = 1; | |
3798 | } else { | |
3799 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3800 | } |
0e4f8f88 | 3801 | |
25179201 | 3802 | spin_unlock(&space_info->lock); |
9ed74f2d | 3803 | |
6d74119f JB |
3804 | mutex_lock(&fs_info->chunk_mutex); |
3805 | ||
3806 | /* | |
3807 | * The chunk_mutex is held throughout the entirety of a chunk | |
3808 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3809 | * other guy is done and we need to recheck and see if we should | |
3810 | * allocate. | |
3811 | */ | |
3812 | if (wait_for_alloc) { | |
3813 | mutex_unlock(&fs_info->chunk_mutex); | |
3814 | wait_for_alloc = 0; | |
3815 | goto again; | |
3816 | } | |
3817 | ||
c6b305a8 JB |
3818 | trans->allocating_chunk = true; |
3819 | ||
67377734 JB |
3820 | /* |
3821 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3822 | * allocating mixed chunks instead of individual chunks. | |
3823 | */ | |
3824 | if (btrfs_mixed_space_info(space_info)) | |
3825 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3826 | ||
97e728d4 JB |
3827 | /* |
3828 | * if we're doing a data chunk, go ahead and make sure that | |
3829 | * we keep a reasonable number of metadata chunks allocated in the | |
3830 | * FS as well. | |
3831 | */ | |
9ed74f2d | 3832 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3833 | fs_info->data_chunk_allocations++; |
3834 | if (!(fs_info->data_chunk_allocations % | |
3835 | fs_info->metadata_ratio)) | |
3836 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3837 | } |
3838 | ||
15d1ff81 LB |
3839 | /* |
3840 | * Check if we have enough space in SYSTEM chunk because we may need | |
3841 | * to update devices. | |
3842 | */ | |
3843 | check_system_chunk(trans, extent_root, flags); | |
3844 | ||
2b82032c | 3845 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3846 | trans->allocating_chunk = false; |
92b8e897 | 3847 | |
9ed74f2d | 3848 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3849 | if (ret < 0 && ret != -ENOSPC) |
3850 | goto out; | |
9ed74f2d | 3851 | if (ret) |
6324fbf3 | 3852 | space_info->full = 1; |
424499db YZ |
3853 | else |
3854 | ret = 1; | |
6d74119f | 3855 | |
0e4f8f88 | 3856 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3857 | out: |
6d74119f | 3858 | space_info->chunk_alloc = 0; |
9ed74f2d | 3859 | spin_unlock(&space_info->lock); |
a25c75d5 | 3860 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3861 | return ret; |
6324fbf3 | 3862 | } |
9ed74f2d | 3863 | |
a80c8dcf JB |
3864 | static int can_overcommit(struct btrfs_root *root, |
3865 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3866 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3867 | { |
96f1bb57 | 3868 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3869 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 3870 | u64 space_size; |
a80c8dcf JB |
3871 | u64 avail; |
3872 | u64 used; | |
70afa399 | 3873 | u64 to_add; |
a80c8dcf JB |
3874 | |
3875 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3876 | space_info->bytes_pinned + space_info->bytes_readonly; |
3877 | ||
96f1bb57 JB |
3878 | /* |
3879 | * We only want to allow over committing if we have lots of actual space | |
3880 | * free, but if we don't have enough space to handle the global reserve | |
3881 | * space then we could end up having a real enospc problem when trying | |
3882 | * to allocate a chunk or some other such important allocation. | |
3883 | */ | |
3c76cd84 MX |
3884 | spin_lock(&global_rsv->lock); |
3885 | space_size = calc_global_rsv_need_space(global_rsv); | |
3886 | spin_unlock(&global_rsv->lock); | |
3887 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
3888 | return 0; |
3889 | ||
3890 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3891 | |
3892 | spin_lock(&root->fs_info->free_chunk_lock); | |
3893 | avail = root->fs_info->free_chunk_space; | |
3894 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3895 | ||
3896 | /* | |
3897 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
3898 | * space is actually useable. For raid56, the space info used |
3899 | * doesn't include the parity drive, so we don't have to | |
3900 | * change the math | |
a80c8dcf JB |
3901 | */ |
3902 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3903 | BTRFS_BLOCK_GROUP_RAID1 | | |
3904 | BTRFS_BLOCK_GROUP_RAID10)) | |
3905 | avail >>= 1; | |
3906 | ||
70afa399 JB |
3907 | to_add = space_info->total_bytes; |
3908 | ||
a80c8dcf | 3909 | /* |
561c294d MX |
3910 | * If we aren't flushing all things, let us overcommit up to |
3911 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3912 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3913 | */ |
08e007d2 | 3914 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
70afa399 | 3915 | to_add >>= 3; |
a80c8dcf | 3916 | else |
70afa399 | 3917 | to_add >>= 1; |
a80c8dcf | 3918 | |
70afa399 JB |
3919 | /* |
3920 | * Limit the overcommit to the amount of free space we could possibly | |
3921 | * allocate for chunks. | |
3922 | */ | |
3923 | to_add = min(avail, to_add); | |
a80c8dcf | 3924 | |
70afa399 | 3925 | if (used + bytes < space_info->total_bytes + to_add) |
a80c8dcf JB |
3926 | return 1; |
3927 | return 0; | |
3928 | } | |
3929 | ||
da633a42 MX |
3930 | void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3931 | unsigned long nr_pages) | |
3932 | { | |
3933 | struct super_block *sb = root->fs_info->sb; | |
3934 | int started; | |
3935 | ||
3936 | /* If we can not start writeback, just sync all the delalloc file. */ | |
b695188d | 3937 | started = try_to_writeback_inodes_sb_nr(sb, nr_pages, |
da633a42 MX |
3938 | WB_REASON_FS_FREE_SPACE); |
3939 | if (!started) { | |
3940 | /* | |
3941 | * We needn't worry the filesystem going from r/w to r/o though | |
3942 | * we don't acquire ->s_umount mutex, because the filesystem | |
3943 | * should guarantee the delalloc inodes list be empty after | |
3944 | * the filesystem is readonly(all dirty pages are written to | |
3945 | * the disk). | |
3946 | */ | |
3947 | btrfs_start_delalloc_inodes(root, 0); | |
98ad69cf JB |
3948 | if (!current->journal_info) |
3949 | btrfs_wait_ordered_extents(root, 0); | |
da633a42 MX |
3950 | } |
3951 | } | |
3952 | ||
9ed74f2d | 3953 | /* |
5da9d01b | 3954 | * shrink metadata reservation for delalloc |
9ed74f2d | 3955 | */ |
f4c738c2 JB |
3956 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
3957 | bool wait_ordered) | |
5da9d01b | 3958 | { |
0ca1f7ce | 3959 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3960 | struct btrfs_space_info *space_info; |
663350ac | 3961 | struct btrfs_trans_handle *trans; |
f4c738c2 | 3962 | u64 delalloc_bytes; |
5da9d01b | 3963 | u64 max_reclaim; |
b1953bce | 3964 | long time_left; |
877da174 | 3965 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3966 | int loops = 0; |
08e007d2 | 3967 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 3968 | |
663350ac | 3969 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 3970 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3971 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3972 | |
3973 | smp_mb(); | |
963d678b MX |
3974 | delalloc_bytes = percpu_counter_sum_positive( |
3975 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 3976 | if (delalloc_bytes == 0) { |
fdb5effd | 3977 | if (trans) |
f4c738c2 | 3978 | return; |
6bbe3a9c | 3979 | btrfs_wait_ordered_extents(root, 0); |
f4c738c2 | 3980 | return; |
fdb5effd JB |
3981 | } |
3982 | ||
f4c738c2 JB |
3983 | while (delalloc_bytes && loops < 3) { |
3984 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
3985 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 3986 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
3987 | /* |
3988 | * We need to wait for the async pages to actually start before | |
3989 | * we do anything. | |
3990 | */ | |
3991 | wait_event(root->fs_info->async_submit_wait, | |
3992 | !atomic_read(&root->fs_info->async_delalloc_pages)); | |
3993 | ||
08e007d2 MX |
3994 | if (!trans) |
3995 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
3996 | else | |
3997 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 3998 | spin_lock(&space_info->lock); |
08e007d2 | 3999 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4000 | spin_unlock(&space_info->lock); |
4001 | break; | |
4002 | } | |
0019f10d | 4003 | spin_unlock(&space_info->lock); |
5da9d01b | 4004 | |
36e39c40 | 4005 | loops++; |
f104d044 | 4006 | if (wait_ordered && !trans) { |
6bbe3a9c | 4007 | btrfs_wait_ordered_extents(root, 0); |
f104d044 | 4008 | } else { |
f4c738c2 | 4009 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4010 | if (time_left) |
4011 | break; | |
4012 | } | |
f4c738c2 | 4013 | smp_mb(); |
963d678b MX |
4014 | delalloc_bytes = percpu_counter_sum_positive( |
4015 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4016 | } |
5da9d01b YZ |
4017 | } |
4018 | ||
663350ac JB |
4019 | /** |
4020 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4021 | * @root - the root we're allocating for | |
4022 | * @bytes - the number of bytes we want to reserve | |
4023 | * @force - force the commit | |
8bb8ab2e | 4024 | * |
663350ac JB |
4025 | * This will check to make sure that committing the transaction will actually |
4026 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4027 | * will return -ENOSPC. | |
8bb8ab2e | 4028 | */ |
663350ac JB |
4029 | static int may_commit_transaction(struct btrfs_root *root, |
4030 | struct btrfs_space_info *space_info, | |
4031 | u64 bytes, int force) | |
4032 | { | |
4033 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4034 | struct btrfs_trans_handle *trans; | |
4035 | ||
4036 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4037 | if (trans) | |
4038 | return -EAGAIN; | |
4039 | ||
4040 | if (force) | |
4041 | goto commit; | |
4042 | ||
4043 | /* See if there is enough pinned space to make this reservation */ | |
4044 | spin_lock(&space_info->lock); | |
4045 | if (space_info->bytes_pinned >= bytes) { | |
4046 | spin_unlock(&space_info->lock); | |
4047 | goto commit; | |
4048 | } | |
4049 | spin_unlock(&space_info->lock); | |
4050 | ||
4051 | /* | |
4052 | * See if there is some space in the delayed insertion reservation for | |
4053 | * this reservation. | |
4054 | */ | |
4055 | if (space_info != delayed_rsv->space_info) | |
4056 | return -ENOSPC; | |
4057 | ||
d9b0218f | 4058 | spin_lock(&space_info->lock); |
663350ac | 4059 | spin_lock(&delayed_rsv->lock); |
d9b0218f | 4060 | if (space_info->bytes_pinned + delayed_rsv->size < bytes) { |
663350ac | 4061 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 4062 | spin_unlock(&space_info->lock); |
663350ac JB |
4063 | return -ENOSPC; |
4064 | } | |
4065 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 4066 | spin_unlock(&space_info->lock); |
663350ac JB |
4067 | |
4068 | commit: | |
4069 | trans = btrfs_join_transaction(root); | |
4070 | if (IS_ERR(trans)) | |
4071 | return -ENOSPC; | |
4072 | ||
4073 | return btrfs_commit_transaction(trans, root); | |
4074 | } | |
4075 | ||
96c3f433 | 4076 | enum flush_state { |
67b0fd63 JB |
4077 | FLUSH_DELAYED_ITEMS_NR = 1, |
4078 | FLUSH_DELAYED_ITEMS = 2, | |
4079 | FLUSH_DELALLOC = 3, | |
4080 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4081 | ALLOC_CHUNK = 5, |
4082 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4083 | }; |
4084 | ||
4085 | static int flush_space(struct btrfs_root *root, | |
4086 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4087 | u64 orig_bytes, int state) | |
4088 | { | |
4089 | struct btrfs_trans_handle *trans; | |
4090 | int nr; | |
f4c738c2 | 4091 | int ret = 0; |
96c3f433 JB |
4092 | |
4093 | switch (state) { | |
96c3f433 JB |
4094 | case FLUSH_DELAYED_ITEMS_NR: |
4095 | case FLUSH_DELAYED_ITEMS: | |
4096 | if (state == FLUSH_DELAYED_ITEMS_NR) { | |
4097 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4098 | ||
4099 | nr = (int)div64_u64(num_bytes, bytes); | |
4100 | if (!nr) | |
4101 | nr = 1; | |
4102 | nr *= 2; | |
4103 | } else { | |
4104 | nr = -1; | |
4105 | } | |
4106 | trans = btrfs_join_transaction(root); | |
4107 | if (IS_ERR(trans)) { | |
4108 | ret = PTR_ERR(trans); | |
4109 | break; | |
4110 | } | |
4111 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4112 | btrfs_end_transaction(trans, root); | |
4113 | break; | |
67b0fd63 JB |
4114 | case FLUSH_DELALLOC: |
4115 | case FLUSH_DELALLOC_WAIT: | |
4116 | shrink_delalloc(root, num_bytes, orig_bytes, | |
4117 | state == FLUSH_DELALLOC_WAIT); | |
4118 | break; | |
ea658bad JB |
4119 | case ALLOC_CHUNK: |
4120 | trans = btrfs_join_transaction(root); | |
4121 | if (IS_ERR(trans)) { | |
4122 | ret = PTR_ERR(trans); | |
4123 | break; | |
4124 | } | |
4125 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4126 | btrfs_get_alloc_profile(root, 0), |
4127 | CHUNK_ALLOC_NO_FORCE); | |
4128 | btrfs_end_transaction(trans, root); | |
4129 | if (ret == -ENOSPC) | |
4130 | ret = 0; | |
4131 | break; | |
96c3f433 JB |
4132 | case COMMIT_TRANS: |
4133 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4134 | break; | |
4135 | default: | |
4136 | ret = -ENOSPC; | |
4137 | break; | |
4138 | } | |
4139 | ||
4140 | return ret; | |
4141 | } | |
4a92b1b8 JB |
4142 | /** |
4143 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4144 | * @root - the root we're allocating for | |
4145 | * @block_rsv - the block_rsv we're allocating for | |
4146 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4147 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4148 | * |
4a92b1b8 JB |
4149 | * This will reserve orgi_bytes number of bytes from the space info associated |
4150 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4151 | * flush out space to make room. It will do this by flushing delalloc if | |
4152 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4153 | * regain reservations will be made and this will fail if there is not enough | |
4154 | * space already. | |
8bb8ab2e | 4155 | */ |
4a92b1b8 | 4156 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4157 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4158 | u64 orig_bytes, |
4159 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4160 | { |
f0486c68 | 4161 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4162 | u64 used; |
8bb8ab2e | 4163 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4164 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4165 | int ret = 0; |
fdb5effd | 4166 | bool flushing = false; |
9ed74f2d | 4167 | |
8bb8ab2e | 4168 | again: |
fdb5effd | 4169 | ret = 0; |
8bb8ab2e | 4170 | spin_lock(&space_info->lock); |
fdb5effd | 4171 | /* |
08e007d2 MX |
4172 | * We only want to wait if somebody other than us is flushing and we |
4173 | * are actually allowed to flush all things. | |
fdb5effd | 4174 | */ |
08e007d2 MX |
4175 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4176 | space_info->flush) { | |
fdb5effd JB |
4177 | spin_unlock(&space_info->lock); |
4178 | /* | |
4179 | * If we have a trans handle we can't wait because the flusher | |
4180 | * may have to commit the transaction, which would mean we would | |
4181 | * deadlock since we are waiting for the flusher to finish, but | |
4182 | * hold the current transaction open. | |
4183 | */ | |
663350ac | 4184 | if (current->journal_info) |
fdb5effd | 4185 | return -EAGAIN; |
b9688bb8 AJ |
4186 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4187 | /* Must have been killed, return */ | |
4188 | if (ret) | |
fdb5effd JB |
4189 | return -EINTR; |
4190 | ||
4191 | spin_lock(&space_info->lock); | |
4192 | } | |
4193 | ||
4194 | ret = -ENOSPC; | |
2bf64758 JB |
4195 | used = space_info->bytes_used + space_info->bytes_reserved + |
4196 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4197 | space_info->bytes_may_use; | |
9ed74f2d | 4198 | |
8bb8ab2e JB |
4199 | /* |
4200 | * The idea here is that we've not already over-reserved the block group | |
4201 | * then we can go ahead and save our reservation first and then start | |
4202 | * flushing if we need to. Otherwise if we've already overcommitted | |
4203 | * lets start flushing stuff first and then come back and try to make | |
4204 | * our reservation. | |
4205 | */ | |
2bf64758 JB |
4206 | if (used <= space_info->total_bytes) { |
4207 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4208 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4209 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4210 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4211 | ret = 0; |
4212 | } else { | |
4213 | /* | |
4214 | * Ok set num_bytes to orig_bytes since we aren't | |
4215 | * overocmmitted, this way we only try and reclaim what | |
4216 | * we need. | |
4217 | */ | |
4218 | num_bytes = orig_bytes; | |
4219 | } | |
4220 | } else { | |
4221 | /* | |
4222 | * Ok we're over committed, set num_bytes to the overcommitted | |
4223 | * amount plus the amount of bytes that we need for this | |
4224 | * reservation. | |
4225 | */ | |
2bf64758 | 4226 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4227 | (orig_bytes * 2); |
8bb8ab2e | 4228 | } |
9ed74f2d | 4229 | |
44734ed1 JB |
4230 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4231 | space_info->bytes_may_use += orig_bytes; | |
4232 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4233 | space_info->flags, orig_bytes, | |
4234 | 1); | |
4235 | ret = 0; | |
2bf64758 JB |
4236 | } |
4237 | ||
8bb8ab2e JB |
4238 | /* |
4239 | * Couldn't make our reservation, save our place so while we're trying | |
4240 | * to reclaim space we can actually use it instead of somebody else | |
4241 | * stealing it from us. | |
08e007d2 MX |
4242 | * |
4243 | * We make the other tasks wait for the flush only when we can flush | |
4244 | * all things. | |
8bb8ab2e | 4245 | */ |
72bcd99d | 4246 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4247 | flushing = true; |
4248 | space_info->flush = 1; | |
8bb8ab2e | 4249 | } |
9ed74f2d | 4250 | |
f0486c68 | 4251 | spin_unlock(&space_info->lock); |
9ed74f2d | 4252 | |
08e007d2 | 4253 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4254 | goto out; |
f0486c68 | 4255 | |
96c3f433 JB |
4256 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4257 | flush_state); | |
4258 | flush_state++; | |
08e007d2 MX |
4259 | |
4260 | /* | |
4261 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4262 | * would happen. So skip delalloc flush. | |
4263 | */ | |
4264 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4265 | (flush_state == FLUSH_DELALLOC || | |
4266 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4267 | flush_state = ALLOC_CHUNK; | |
4268 | ||
96c3f433 | 4269 | if (!ret) |
8bb8ab2e | 4270 | goto again; |
08e007d2 MX |
4271 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4272 | flush_state < COMMIT_TRANS) | |
4273 | goto again; | |
4274 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4275 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4276 | goto again; |
4277 | ||
4278 | out: | |
5d80366e JB |
4279 | if (ret == -ENOSPC && |
4280 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4281 | struct btrfs_block_rsv *global_rsv = | |
4282 | &root->fs_info->global_block_rsv; | |
4283 | ||
4284 | if (block_rsv != global_rsv && | |
4285 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4286 | ret = 0; | |
4287 | } | |
fdb5effd | 4288 | if (flushing) { |
8bb8ab2e | 4289 | spin_lock(&space_info->lock); |
fdb5effd JB |
4290 | space_info->flush = 0; |
4291 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4292 | spin_unlock(&space_info->lock); |
f0486c68 | 4293 | } |
f0486c68 YZ |
4294 | return ret; |
4295 | } | |
4296 | ||
79787eaa JM |
4297 | static struct btrfs_block_rsv *get_block_rsv( |
4298 | const struct btrfs_trans_handle *trans, | |
4299 | const struct btrfs_root *root) | |
f0486c68 | 4300 | { |
4c13d758 JB |
4301 | struct btrfs_block_rsv *block_rsv = NULL; |
4302 | ||
0e721106 JB |
4303 | if (root->ref_cows) |
4304 | block_rsv = trans->block_rsv; | |
4305 | ||
4306 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4307 | block_rsv = trans->block_rsv; |
4c13d758 JB |
4308 | |
4309 | if (!block_rsv) | |
f0486c68 YZ |
4310 | block_rsv = root->block_rsv; |
4311 | ||
4312 | if (!block_rsv) | |
4313 | block_rsv = &root->fs_info->empty_block_rsv; | |
4314 | ||
4315 | return block_rsv; | |
4316 | } | |
4317 | ||
4318 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4319 | u64 num_bytes) | |
4320 | { | |
4321 | int ret = -ENOSPC; | |
4322 | spin_lock(&block_rsv->lock); | |
4323 | if (block_rsv->reserved >= num_bytes) { | |
4324 | block_rsv->reserved -= num_bytes; | |
4325 | if (block_rsv->reserved < block_rsv->size) | |
4326 | block_rsv->full = 0; | |
4327 | ret = 0; | |
4328 | } | |
4329 | spin_unlock(&block_rsv->lock); | |
4330 | return ret; | |
4331 | } | |
4332 | ||
4333 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4334 | u64 num_bytes, int update_size) | |
4335 | { | |
4336 | spin_lock(&block_rsv->lock); | |
4337 | block_rsv->reserved += num_bytes; | |
4338 | if (update_size) | |
4339 | block_rsv->size += num_bytes; | |
4340 | else if (block_rsv->reserved >= block_rsv->size) | |
4341 | block_rsv->full = 1; | |
4342 | spin_unlock(&block_rsv->lock); | |
4343 | } | |
4344 | ||
8c2a3ca2 JB |
4345 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4346 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4347 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4348 | { |
4349 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4350 | ||
4351 | spin_lock(&block_rsv->lock); | |
4352 | if (num_bytes == (u64)-1) | |
4353 | num_bytes = block_rsv->size; | |
4354 | block_rsv->size -= num_bytes; | |
4355 | if (block_rsv->reserved >= block_rsv->size) { | |
4356 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4357 | block_rsv->reserved = block_rsv->size; | |
4358 | block_rsv->full = 1; | |
4359 | } else { | |
4360 | num_bytes = 0; | |
4361 | } | |
4362 | spin_unlock(&block_rsv->lock); | |
4363 | ||
4364 | if (num_bytes > 0) { | |
4365 | if (dest) { | |
e9e22899 JB |
4366 | spin_lock(&dest->lock); |
4367 | if (!dest->full) { | |
4368 | u64 bytes_to_add; | |
4369 | ||
4370 | bytes_to_add = dest->size - dest->reserved; | |
4371 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4372 | dest->reserved += bytes_to_add; | |
4373 | if (dest->reserved >= dest->size) | |
4374 | dest->full = 1; | |
4375 | num_bytes -= bytes_to_add; | |
4376 | } | |
4377 | spin_unlock(&dest->lock); | |
4378 | } | |
4379 | if (num_bytes) { | |
f0486c68 | 4380 | spin_lock(&space_info->lock); |
fb25e914 | 4381 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4382 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4383 | space_info->flags, num_bytes, 0); |
36e39c40 | 4384 | space_info->reservation_progress++; |
f0486c68 | 4385 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4386 | } |
9ed74f2d | 4387 | } |
f0486c68 | 4388 | } |
4e06bdd6 | 4389 | |
f0486c68 YZ |
4390 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4391 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4392 | { | |
4393 | int ret; | |
9ed74f2d | 4394 | |
f0486c68 YZ |
4395 | ret = block_rsv_use_bytes(src, num_bytes); |
4396 | if (ret) | |
4397 | return ret; | |
9ed74f2d | 4398 | |
f0486c68 | 4399 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4400 | return 0; |
4401 | } | |
4402 | ||
66d8f3dd | 4403 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4404 | { |
f0486c68 YZ |
4405 | memset(rsv, 0, sizeof(*rsv)); |
4406 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4407 | rsv->type = type; |
f0486c68 YZ |
4408 | } |
4409 | ||
66d8f3dd MX |
4410 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4411 | unsigned short type) | |
f0486c68 YZ |
4412 | { |
4413 | struct btrfs_block_rsv *block_rsv; | |
4414 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4415 | |
f0486c68 YZ |
4416 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4417 | if (!block_rsv) | |
4418 | return NULL; | |
9ed74f2d | 4419 | |
66d8f3dd | 4420 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4421 | block_rsv->space_info = __find_space_info(fs_info, |
4422 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4423 | return block_rsv; |
4424 | } | |
9ed74f2d | 4425 | |
f0486c68 YZ |
4426 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4427 | struct btrfs_block_rsv *rsv) | |
4428 | { | |
2aaa6655 JB |
4429 | if (!rsv) |
4430 | return; | |
dabdb640 JB |
4431 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4432 | kfree(rsv); | |
9ed74f2d JB |
4433 | } |
4434 | ||
08e007d2 MX |
4435 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4436 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4437 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4438 | { |
f0486c68 | 4439 | int ret; |
9ed74f2d | 4440 | |
f0486c68 YZ |
4441 | if (num_bytes == 0) |
4442 | return 0; | |
8bb8ab2e | 4443 | |
61b520a9 | 4444 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4445 | if (!ret) { |
4446 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4447 | return 0; | |
4448 | } | |
9ed74f2d | 4449 | |
f0486c68 | 4450 | return ret; |
f0486c68 | 4451 | } |
9ed74f2d | 4452 | |
4a92b1b8 | 4453 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4454 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4455 | { |
4456 | u64 num_bytes = 0; | |
f0486c68 | 4457 | int ret = -ENOSPC; |
9ed74f2d | 4458 | |
f0486c68 YZ |
4459 | if (!block_rsv) |
4460 | return 0; | |
9ed74f2d | 4461 | |
f0486c68 | 4462 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4463 | num_bytes = div_factor(block_rsv->size, min_factor); |
4464 | if (block_rsv->reserved >= num_bytes) | |
4465 | ret = 0; | |
4466 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4467 | |
36ba022a JB |
4468 | return ret; |
4469 | } | |
4470 | ||
08e007d2 MX |
4471 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4472 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4473 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4474 | { |
4475 | u64 num_bytes = 0; | |
4476 | int ret = -ENOSPC; | |
4477 | ||
4478 | if (!block_rsv) | |
4479 | return 0; | |
4480 | ||
4481 | spin_lock(&block_rsv->lock); | |
4482 | num_bytes = min_reserved; | |
13553e52 | 4483 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4484 | ret = 0; |
13553e52 | 4485 | else |
f0486c68 | 4486 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4487 | spin_unlock(&block_rsv->lock); |
13553e52 | 4488 | |
f0486c68 YZ |
4489 | if (!ret) |
4490 | return 0; | |
4491 | ||
aa38a711 | 4492 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4493 | if (!ret) { |
4494 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4495 | return 0; |
6a63209f | 4496 | } |
9ed74f2d | 4497 | |
13553e52 | 4498 | return ret; |
f0486c68 YZ |
4499 | } |
4500 | ||
4501 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4502 | struct btrfs_block_rsv *dst_rsv, | |
4503 | u64 num_bytes) | |
4504 | { | |
4505 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4506 | } | |
4507 | ||
4508 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4509 | struct btrfs_block_rsv *block_rsv, | |
4510 | u64 num_bytes) | |
4511 | { | |
4512 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4513 | if (global_rsv->full || global_rsv == block_rsv || | |
4514 | block_rsv->space_info != global_rsv->space_info) | |
4515 | global_rsv = NULL; | |
8c2a3ca2 JB |
4516 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4517 | num_bytes); | |
6a63209f JB |
4518 | } |
4519 | ||
4520 | /* | |
8929ecfa YZ |
4521 | * helper to calculate size of global block reservation. |
4522 | * the desired value is sum of space used by extent tree, | |
4523 | * checksum tree and root tree | |
6a63209f | 4524 | */ |
8929ecfa | 4525 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4526 | { |
8929ecfa YZ |
4527 | struct btrfs_space_info *sinfo; |
4528 | u64 num_bytes; | |
4529 | u64 meta_used; | |
4530 | u64 data_used; | |
6c41761f | 4531 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4532 | |
8929ecfa YZ |
4533 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4534 | spin_lock(&sinfo->lock); | |
4535 | data_used = sinfo->bytes_used; | |
4536 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4537 | |
8929ecfa YZ |
4538 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4539 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4540 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4541 | data_used = 0; | |
8929ecfa YZ |
4542 | meta_used = sinfo->bytes_used; |
4543 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4544 | |
8929ecfa YZ |
4545 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4546 | csum_size * 2; | |
4547 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4548 | |
8929ecfa | 4549 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4550 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4551 | |
8929ecfa YZ |
4552 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4553 | } | |
6a63209f | 4554 | |
8929ecfa YZ |
4555 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4556 | { | |
4557 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4558 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4559 | u64 num_bytes; | |
6a63209f | 4560 | |
8929ecfa | 4561 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4562 | |
8929ecfa | 4563 | spin_lock(&sinfo->lock); |
1f699d38 | 4564 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4565 | |
fdf30d1c | 4566 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4567 | |
8929ecfa | 4568 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4569 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4570 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4571 | |
4572 | if (sinfo->total_bytes > num_bytes) { | |
4573 | num_bytes = sinfo->total_bytes - num_bytes; | |
4574 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4575 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4576 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4577 | sinfo->flags, num_bytes, 1); |
6a63209f | 4578 | } |
6a63209f | 4579 | |
8929ecfa YZ |
4580 | if (block_rsv->reserved >= block_rsv->size) { |
4581 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4582 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4583 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4584 | sinfo->flags, num_bytes, 0); |
36e39c40 | 4585 | sinfo->reservation_progress++; |
8929ecfa YZ |
4586 | block_rsv->reserved = block_rsv->size; |
4587 | block_rsv->full = 1; | |
4588 | } | |
182608c8 | 4589 | |
8929ecfa | 4590 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4591 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4592 | } |
4593 | ||
f0486c68 | 4594 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4595 | { |
f0486c68 | 4596 | struct btrfs_space_info *space_info; |
6a63209f | 4597 | |
f0486c68 YZ |
4598 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4599 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4600 | |
f0486c68 | 4601 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4602 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4603 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4604 | fs_info->trans_block_rsv.space_info = space_info; |
4605 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4606 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4607 | |
8929ecfa YZ |
4608 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4609 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4610 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4611 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4612 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4613 | |
8929ecfa | 4614 | update_global_block_rsv(fs_info); |
6a63209f JB |
4615 | } |
4616 | ||
8929ecfa | 4617 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4618 | { |
8c2a3ca2 JB |
4619 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4620 | (u64)-1); | |
8929ecfa YZ |
4621 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4622 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4623 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4624 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4625 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4626 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4627 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4628 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4629 | } |
4630 | ||
a22285a6 YZ |
4631 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4632 | struct btrfs_root *root) | |
6a63209f | 4633 | { |
0e721106 JB |
4634 | if (!trans->block_rsv) |
4635 | return; | |
4636 | ||
a22285a6 YZ |
4637 | if (!trans->bytes_reserved) |
4638 | return; | |
6a63209f | 4639 | |
e77266e4 | 4640 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4641 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4642 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4643 | trans->bytes_reserved = 0; |
4644 | } | |
6a63209f | 4645 | |
79787eaa | 4646 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4647 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4648 | struct inode *inode) | |
4649 | { | |
4650 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4651 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4652 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4653 | ||
4654 | /* | |
fcb80c2a JB |
4655 | * We need to hold space in order to delete our orphan item once we've |
4656 | * added it, so this takes the reservation so we can release it later | |
4657 | * when we are truly done with the orphan item. | |
d68fc57b | 4658 | */ |
ff5714cc | 4659 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4660 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4661 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4662 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4663 | } |
4664 | ||
d68fc57b | 4665 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4666 | { |
d68fc57b | 4667 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4668 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4669 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4670 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4671 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4672 | } | |
97e728d4 | 4673 | |
d5c12070 MX |
4674 | /* |
4675 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4676 | * root: the root of the parent directory | |
4677 | * rsv: block reservation | |
4678 | * items: the number of items that we need do reservation | |
4679 | * qgroup_reserved: used to return the reserved size in qgroup | |
4680 | * | |
4681 | * This function is used to reserve the space for snapshot/subvolume | |
4682 | * creation and deletion. Those operations are different with the | |
4683 | * common file/directory operations, they change two fs/file trees | |
4684 | * and root tree, the number of items that the qgroup reserves is | |
4685 | * different with the free space reservation. So we can not use | |
4686 | * the space reseravtion mechanism in start_transaction(). | |
4687 | */ | |
4688 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4689 | struct btrfs_block_rsv *rsv, | |
4690 | int items, | |
4691 | u64 *qgroup_reserved) | |
a22285a6 | 4692 | { |
d5c12070 MX |
4693 | u64 num_bytes; |
4694 | int ret; | |
4695 | ||
4696 | if (root->fs_info->quota_enabled) { | |
4697 | /* One for parent inode, two for dir entries */ | |
4698 | num_bytes = 3 * root->leafsize; | |
4699 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4700 | if (ret) | |
4701 | return ret; | |
4702 | } else { | |
4703 | num_bytes = 0; | |
4704 | } | |
4705 | ||
4706 | *qgroup_reserved = num_bytes; | |
4707 | ||
4708 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4709 | rsv->space_info = __find_space_info(root->fs_info, | |
4710 | BTRFS_BLOCK_GROUP_METADATA); | |
4711 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4712 | BTRFS_RESERVE_FLUSH_ALL); | |
4713 | if (ret) { | |
4714 | if (*qgroup_reserved) | |
4715 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4716 | } | |
4717 | ||
4718 | return ret; | |
4719 | } | |
4720 | ||
4721 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4722 | struct btrfs_block_rsv *rsv, | |
4723 | u64 qgroup_reserved) | |
4724 | { | |
4725 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4726 | if (qgroup_reserved) | |
4727 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4728 | } |
4729 | ||
7709cde3 JB |
4730 | /** |
4731 | * drop_outstanding_extent - drop an outstanding extent | |
4732 | * @inode: the inode we're dropping the extent for | |
4733 | * | |
4734 | * This is called when we are freeing up an outstanding extent, either called | |
4735 | * after an error or after an extent is written. This will return the number of | |
4736 | * reserved extents that need to be freed. This must be called with | |
4737 | * BTRFS_I(inode)->lock held. | |
4738 | */ | |
9e0baf60 JB |
4739 | static unsigned drop_outstanding_extent(struct inode *inode) |
4740 | { | |
7fd2ae21 | 4741 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4742 | unsigned dropped_extents = 0; |
4743 | ||
9e0baf60 JB |
4744 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4745 | BTRFS_I(inode)->outstanding_extents--; | |
4746 | ||
7fd2ae21 | 4747 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4748 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4749 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4750 | drop_inode_space = 1; |
7fd2ae21 | 4751 | |
9e0baf60 JB |
4752 | /* |
4753 | * If we have more or the same amount of outsanding extents than we have | |
4754 | * reserved then we need to leave the reserved extents count alone. | |
4755 | */ | |
4756 | if (BTRFS_I(inode)->outstanding_extents >= | |
4757 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4758 | return drop_inode_space; |
9e0baf60 JB |
4759 | |
4760 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4761 | BTRFS_I(inode)->outstanding_extents; | |
4762 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4763 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4764 | } |
4765 | ||
7709cde3 JB |
4766 | /** |
4767 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4768 | * reserved/free'd for the given bytes. | |
4769 | * @inode: the inode we're manipulating | |
4770 | * @num_bytes: the number of bytes in question | |
4771 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4772 | * | |
4773 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4774 | * correct amount of metadata that must either be reserved or freed. We | |
4775 | * calculate how many checksums we can fit into one leaf and then divide the | |
4776 | * number of bytes that will need to be checksumed by this value to figure out | |
4777 | * how many checksums will be required. If we are adding bytes then the number | |
4778 | * may go up and we will return the number of additional bytes that must be | |
4779 | * reserved. If it is going down we will return the number of bytes that must | |
4780 | * be freed. | |
4781 | * | |
4782 | * This must be called with BTRFS_I(inode)->lock held. | |
4783 | */ | |
4784 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4785 | int reserve) | |
6324fbf3 | 4786 | { |
7709cde3 JB |
4787 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4788 | u64 csum_size; | |
4789 | int num_csums_per_leaf; | |
4790 | int num_csums; | |
4791 | int old_csums; | |
4792 | ||
4793 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4794 | BTRFS_I(inode)->csum_bytes == 0) | |
4795 | return 0; | |
4796 | ||
4797 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4798 | if (reserve) | |
4799 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4800 | else | |
4801 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4802 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4803 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4804 | sizeof(struct btrfs_csum_item) + | |
4805 | sizeof(struct btrfs_disk_key)); | |
4806 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4807 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4808 | num_csums = num_csums / num_csums_per_leaf; | |
4809 | ||
4810 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4811 | old_csums = old_csums / num_csums_per_leaf; | |
4812 | ||
4813 | /* No change, no need to reserve more */ | |
4814 | if (old_csums == num_csums) | |
4815 | return 0; | |
4816 | ||
4817 | if (reserve) | |
4818 | return btrfs_calc_trans_metadata_size(root, | |
4819 | num_csums - old_csums); | |
4820 | ||
4821 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4822 | } |
c146afad | 4823 | |
0ca1f7ce YZ |
4824 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4825 | { | |
4826 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4827 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4828 | u64 to_reserve = 0; |
660d3f6c | 4829 | u64 csum_bytes; |
9e0baf60 | 4830 | unsigned nr_extents = 0; |
660d3f6c | 4831 | int extra_reserve = 0; |
08e007d2 | 4832 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4833 | int ret = 0; |
c64c2bd8 | 4834 | bool delalloc_lock = true; |
88e081bf WS |
4835 | u64 to_free = 0; |
4836 | unsigned dropped; | |
6324fbf3 | 4837 | |
c64c2bd8 JB |
4838 | /* If we are a free space inode we need to not flush since we will be in |
4839 | * the middle of a transaction commit. We also don't need the delalloc | |
4840 | * mutex since we won't race with anybody. We need this mostly to make | |
4841 | * lockdep shut its filthy mouth. | |
4842 | */ | |
4843 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4844 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4845 | delalloc_lock = false; |
4846 | } | |
c09544e0 | 4847 | |
08e007d2 MX |
4848 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4849 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4850 | schedule_timeout(1); |
ec44a35c | 4851 | |
c64c2bd8 JB |
4852 | if (delalloc_lock) |
4853 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4854 | ||
0ca1f7ce | 4855 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4856 | |
9e0baf60 JB |
4857 | spin_lock(&BTRFS_I(inode)->lock); |
4858 | BTRFS_I(inode)->outstanding_extents++; | |
4859 | ||
4860 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4861 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4862 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4863 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4864 | |
7fd2ae21 JB |
4865 | /* |
4866 | * Add an item to reserve for updating the inode when we complete the | |
4867 | * delalloc io. | |
4868 | */ | |
72ac3c0d JB |
4869 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4870 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4871 | nr_extents++; |
660d3f6c | 4872 | extra_reserve = 1; |
593060d7 | 4873 | } |
7fd2ae21 JB |
4874 | |
4875 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4876 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4877 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4878 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4879 | |
88e081bf | 4880 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4881 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4882 | nr_extents * root->leafsize); | |
88e081bf WS |
4883 | if (ret) |
4884 | goto out_fail; | |
4885 | } | |
c5567237 | 4886 | |
88e081bf WS |
4887 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4888 | if (unlikely(ret)) { | |
4889 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4890 | btrfs_qgroup_free(root, num_bytes + |
4891 | nr_extents * root->leafsize); | |
88e081bf | 4892 | goto out_fail; |
9e0baf60 | 4893 | } |
25179201 | 4894 | |
660d3f6c JB |
4895 | spin_lock(&BTRFS_I(inode)->lock); |
4896 | if (extra_reserve) { | |
72ac3c0d JB |
4897 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4898 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
4899 | nr_extents--; |
4900 | } | |
4901 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4902 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
4903 | |
4904 | if (delalloc_lock) | |
4905 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 4906 | |
8c2a3ca2 JB |
4907 | if (to_reserve) |
4908 | trace_btrfs_space_reservation(root->fs_info,"delalloc", | |
4909 | btrfs_ino(inode), to_reserve, 1); | |
0ca1f7ce YZ |
4910 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4911 | ||
0ca1f7ce | 4912 | return 0; |
88e081bf WS |
4913 | |
4914 | out_fail: | |
4915 | spin_lock(&BTRFS_I(inode)->lock); | |
4916 | dropped = drop_outstanding_extent(inode); | |
4917 | /* | |
4918 | * If the inodes csum_bytes is the same as the original | |
4919 | * csum_bytes then we know we haven't raced with any free()ers | |
4920 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 4921 | */ |
f4881bc7 | 4922 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 4923 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
4924 | } else { |
4925 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
4926 | u64 bytes; | |
4927 | ||
4928 | /* | |
4929 | * This is tricky, but first we need to figure out how much we | |
4930 | * free'd from any free-ers that occured during this | |
4931 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
4932 | * before we dropped our lock, and then call the free for the | |
4933 | * number of bytes that were freed while we were trying our | |
4934 | * reservation. | |
4935 | */ | |
4936 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
4937 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
4938 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
4939 | ||
4940 | ||
4941 | /* | |
4942 | * Now we need to see how much we would have freed had we not | |
4943 | * been making this reservation and our ->csum_bytes were not | |
4944 | * artificially inflated. | |
4945 | */ | |
4946 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
4947 | bytes = csum_bytes - orig_csum_bytes; | |
4948 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
4949 | ||
4950 | /* | |
4951 | * Now reset ->csum_bytes to what it should be. If bytes is | |
4952 | * more than to_free then we would have free'd more space had we | |
4953 | * not had an artificially high ->csum_bytes, so we need to free | |
4954 | * the remainder. If bytes is the same or less then we don't | |
4955 | * need to do anything, the other free-ers did the correct | |
4956 | * thing. | |
4957 | */ | |
4958 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
4959 | if (bytes > to_free) | |
4960 | to_free = bytes - to_free; | |
4961 | else | |
4962 | to_free = 0; | |
4963 | } | |
88e081bf WS |
4964 | spin_unlock(&BTRFS_I(inode)->lock); |
4965 | if (dropped) | |
4966 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
4967 | ||
4968 | if (to_free) { | |
4969 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
4970 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
4971 | btrfs_ino(inode), to_free, 0); | |
4972 | } | |
4973 | if (delalloc_lock) | |
4974 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
4975 | return ret; | |
0ca1f7ce YZ |
4976 | } |
4977 | ||
7709cde3 JB |
4978 | /** |
4979 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
4980 | * @inode: the inode to release the reservation for | |
4981 | * @num_bytes: the number of bytes we're releasing | |
4982 | * | |
4983 | * This will release the metadata reservation for an inode. This can be called | |
4984 | * once we complete IO for a given set of bytes to release their metadata | |
4985 | * reservations. | |
4986 | */ | |
0ca1f7ce YZ |
4987 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
4988 | { | |
4989 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
4990 | u64 to_free = 0; |
4991 | unsigned dropped; | |
0ca1f7ce YZ |
4992 | |
4993 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 4994 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4995 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 4996 | |
0934856d MX |
4997 | if (num_bytes) |
4998 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 4999 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5000 | if (dropped > 0) |
5001 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5002 | |
8c2a3ca2 JB |
5003 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5004 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
5005 | if (root->fs_info->quota_enabled) { |
5006 | btrfs_qgroup_free(root, num_bytes + | |
5007 | dropped * root->leafsize); | |
5008 | } | |
5009 | ||
0ca1f7ce YZ |
5010 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5011 | to_free); | |
5012 | } | |
5013 | ||
7709cde3 JB |
5014 | /** |
5015 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5016 | * @inode: inode we're writing to | |
5017 | * @num_bytes: the number of bytes we want to allocate | |
5018 | * | |
5019 | * This will do the following things | |
5020 | * | |
5021 | * o reserve space in the data space info for num_bytes | |
5022 | * o reserve space in the metadata space info based on number of outstanding | |
5023 | * extents and how much csums will be needed | |
5024 | * o add to the inodes ->delalloc_bytes | |
5025 | * o add it to the fs_info's delalloc inodes list. | |
5026 | * | |
5027 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5028 | */ | |
0ca1f7ce YZ |
5029 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5030 | { | |
5031 | int ret; | |
5032 | ||
5033 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 5034 | if (ret) |
0ca1f7ce YZ |
5035 | return ret; |
5036 | ||
5037 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5038 | if (ret) { | |
5039 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5040 | return ret; | |
5041 | } | |
5042 | ||
5043 | return 0; | |
5044 | } | |
5045 | ||
7709cde3 JB |
5046 | /** |
5047 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5048 | * @inode: inode we're releasing space for | |
5049 | * @num_bytes: the number of bytes we want to free up | |
5050 | * | |
5051 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5052 | * called in the case that we don't need the metadata AND data reservations | |
5053 | * anymore. So if there is an error or we insert an inline extent. | |
5054 | * | |
5055 | * This function will release the metadata space that was not used and will | |
5056 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5057 | * list if there are no delalloc bytes left. | |
5058 | */ | |
0ca1f7ce YZ |
5059 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5060 | { | |
5061 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5062 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5063 | } |
5064 | ||
c53d613e | 5065 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 5066 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 5067 | { |
0af3d00b | 5068 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5069 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5070 | u64 total = num_bytes; |
9078a3e1 | 5071 | u64 old_val; |
db94535d | 5072 | u64 byte_in_group; |
0af3d00b | 5073 | int factor; |
3e1ad54f | 5074 | |
5d4f98a2 YZ |
5075 | /* block accounting for super block */ |
5076 | spin_lock(&info->delalloc_lock); | |
6c41761f | 5077 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5078 | if (alloc) |
5079 | old_val += num_bytes; | |
5080 | else | |
5081 | old_val -= num_bytes; | |
6c41761f | 5082 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
5d4f98a2 YZ |
5083 | spin_unlock(&info->delalloc_lock); |
5084 | ||
d397712b | 5085 | while (total) { |
db94535d | 5086 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5087 | if (!cache) |
79787eaa | 5088 | return -ENOENT; |
b742bb82 YZ |
5089 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5090 | BTRFS_BLOCK_GROUP_RAID1 | | |
5091 | BTRFS_BLOCK_GROUP_RAID10)) | |
5092 | factor = 2; | |
5093 | else | |
5094 | factor = 1; | |
9d66e233 JB |
5095 | /* |
5096 | * If this block group has free space cache written out, we | |
5097 | * need to make sure to load it if we are removing space. This | |
5098 | * is because we need the unpinning stage to actually add the | |
5099 | * space back to the block group, otherwise we will leak space. | |
5100 | */ | |
5101 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5102 | cache_block_group(cache, 1); |
0af3d00b | 5103 | |
db94535d CM |
5104 | byte_in_group = bytenr - cache->key.objectid; |
5105 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5106 | |
25179201 | 5107 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5108 | spin_lock(&cache->lock); |
0af3d00b | 5109 | |
73bc1876 | 5110 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5111 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5112 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5113 | ||
0f9dd46c | 5114 | cache->dirty = 1; |
9078a3e1 | 5115 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5116 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5117 | if (alloc) { |
db94535d | 5118 | old_val += num_bytes; |
11833d66 YZ |
5119 | btrfs_set_block_group_used(&cache->item, old_val); |
5120 | cache->reserved -= num_bytes; | |
11833d66 | 5121 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5122 | cache->space_info->bytes_used += num_bytes; |
5123 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5124 | spin_unlock(&cache->lock); |
25179201 | 5125 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5126 | } else { |
db94535d | 5127 | old_val -= num_bytes; |
c286ac48 | 5128 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5129 | cache->pinned += num_bytes; |
5130 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5131 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5132 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5133 | spin_unlock(&cache->lock); |
25179201 | 5134 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5135 | |
f0486c68 YZ |
5136 | set_extent_dirty(info->pinned_extents, |
5137 | bytenr, bytenr + num_bytes - 1, | |
5138 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5139 | } |
fa9c0d79 | 5140 | btrfs_put_block_group(cache); |
db94535d CM |
5141 | total -= num_bytes; |
5142 | bytenr += num_bytes; | |
9078a3e1 CM |
5143 | } |
5144 | return 0; | |
5145 | } | |
6324fbf3 | 5146 | |
a061fc8d CM |
5147 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5148 | { | |
0f9dd46c | 5149 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5150 | u64 bytenr; |
0f9dd46c | 5151 | |
a1897fdd LB |
5152 | spin_lock(&root->fs_info->block_group_cache_lock); |
5153 | bytenr = root->fs_info->first_logical_byte; | |
5154 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5155 | ||
5156 | if (bytenr < (u64)-1) | |
5157 | return bytenr; | |
5158 | ||
0f9dd46c JB |
5159 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5160 | if (!cache) | |
a061fc8d | 5161 | return 0; |
0f9dd46c | 5162 | |
d2fb3437 | 5163 | bytenr = cache->key.objectid; |
fa9c0d79 | 5164 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5165 | |
5166 | return bytenr; | |
a061fc8d CM |
5167 | } |
5168 | ||
f0486c68 YZ |
5169 | static int pin_down_extent(struct btrfs_root *root, |
5170 | struct btrfs_block_group_cache *cache, | |
5171 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5172 | { |
11833d66 YZ |
5173 | spin_lock(&cache->space_info->lock); |
5174 | spin_lock(&cache->lock); | |
5175 | cache->pinned += num_bytes; | |
5176 | cache->space_info->bytes_pinned += num_bytes; | |
5177 | if (reserved) { | |
5178 | cache->reserved -= num_bytes; | |
5179 | cache->space_info->bytes_reserved -= num_bytes; | |
5180 | } | |
5181 | spin_unlock(&cache->lock); | |
5182 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5183 | |
f0486c68 YZ |
5184 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5185 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
5186 | return 0; | |
5187 | } | |
68b38550 | 5188 | |
f0486c68 YZ |
5189 | /* |
5190 | * this function must be called within transaction | |
5191 | */ | |
5192 | int btrfs_pin_extent(struct btrfs_root *root, | |
5193 | u64 bytenr, u64 num_bytes, int reserved) | |
5194 | { | |
5195 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5196 | |
f0486c68 | 5197 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5198 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5199 | |
5200 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5201 | ||
5202 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5203 | return 0; |
5204 | } | |
5205 | ||
f0486c68 | 5206 | /* |
e688b725 CM |
5207 | * this function must be called within transaction |
5208 | */ | |
dcfac415 | 5209 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5210 | u64 bytenr, u64 num_bytes) |
5211 | { | |
5212 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5213 | int ret; |
e688b725 CM |
5214 | |
5215 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5216 | if (!cache) |
5217 | return -EINVAL; | |
e688b725 CM |
5218 | |
5219 | /* | |
5220 | * pull in the free space cache (if any) so that our pin | |
5221 | * removes the free space from the cache. We have load_only set | |
5222 | * to one because the slow code to read in the free extents does check | |
5223 | * the pinned extents. | |
5224 | */ | |
f6373bf3 | 5225 | cache_block_group(cache, 1); |
e688b725 CM |
5226 | |
5227 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5228 | ||
5229 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5230 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5231 | btrfs_put_block_group(cache); |
b50c6e25 | 5232 | return ret; |
e688b725 CM |
5233 | } |
5234 | ||
fb25e914 JB |
5235 | /** |
5236 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5237 | * @cache: The cache we are manipulating | |
5238 | * @num_bytes: The number of bytes in question | |
5239 | * @reserve: One of the reservation enums | |
5240 | * | |
5241 | * This is called by the allocator when it reserves space, or by somebody who is | |
5242 | * freeing space that was never actually used on disk. For example if you | |
5243 | * reserve some space for a new leaf in transaction A and before transaction A | |
5244 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5245 | * clear the reservation. | |
5246 | * | |
5247 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5248 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5249 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5250 | * allocating less disk space for the amount of data we have reserved in the | |
5251 | * case of compression. | |
5252 | * | |
5253 | * If this is a reservation and the block group has become read only we cannot | |
5254 | * make the reservation and return -EAGAIN, otherwise this function always | |
5255 | * succeeds. | |
f0486c68 | 5256 | */ |
fb25e914 JB |
5257 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5258 | u64 num_bytes, int reserve) | |
11833d66 | 5259 | { |
fb25e914 | 5260 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5261 | int ret = 0; |
79787eaa | 5262 | |
fb25e914 JB |
5263 | spin_lock(&space_info->lock); |
5264 | spin_lock(&cache->lock); | |
5265 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5266 | if (cache->ro) { |
5267 | ret = -EAGAIN; | |
5268 | } else { | |
fb25e914 JB |
5269 | cache->reserved += num_bytes; |
5270 | space_info->bytes_reserved += num_bytes; | |
5271 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5272 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5273 | "space_info", space_info->flags, |
5274 | num_bytes, 0); | |
fb25e914 JB |
5275 | space_info->bytes_may_use -= num_bytes; |
5276 | } | |
f0486c68 | 5277 | } |
fb25e914 JB |
5278 | } else { |
5279 | if (cache->ro) | |
5280 | space_info->bytes_readonly += num_bytes; | |
5281 | cache->reserved -= num_bytes; | |
5282 | space_info->bytes_reserved -= num_bytes; | |
5283 | space_info->reservation_progress++; | |
324ae4df | 5284 | } |
fb25e914 JB |
5285 | spin_unlock(&cache->lock); |
5286 | spin_unlock(&space_info->lock); | |
f0486c68 | 5287 | return ret; |
324ae4df | 5288 | } |
9078a3e1 | 5289 | |
143bede5 | 5290 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5291 | struct btrfs_root *root) |
e8569813 | 5292 | { |
e8569813 | 5293 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5294 | struct btrfs_caching_control *next; |
5295 | struct btrfs_caching_control *caching_ctl; | |
5296 | struct btrfs_block_group_cache *cache; | |
e8569813 | 5297 | |
11833d66 | 5298 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5299 | |
11833d66 YZ |
5300 | list_for_each_entry_safe(caching_ctl, next, |
5301 | &fs_info->caching_block_groups, list) { | |
5302 | cache = caching_ctl->block_group; | |
5303 | if (block_group_cache_done(cache)) { | |
5304 | cache->last_byte_to_unpin = (u64)-1; | |
5305 | list_del_init(&caching_ctl->list); | |
5306 | put_caching_control(caching_ctl); | |
e8569813 | 5307 | } else { |
11833d66 | 5308 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5309 | } |
e8569813 | 5310 | } |
11833d66 YZ |
5311 | |
5312 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5313 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5314 | else | |
5315 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5316 | ||
5317 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
5318 | |
5319 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
5320 | } |
5321 | ||
11833d66 | 5322 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5323 | { |
11833d66 YZ |
5324 | struct btrfs_fs_info *fs_info = root->fs_info; |
5325 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5326 | struct btrfs_space_info *space_info; |
5327 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5328 | u64 len; |
7b398f8e | 5329 | bool readonly; |
ccd467d6 | 5330 | |
11833d66 | 5331 | while (start <= end) { |
7b398f8e | 5332 | readonly = false; |
11833d66 YZ |
5333 | if (!cache || |
5334 | start >= cache->key.objectid + cache->key.offset) { | |
5335 | if (cache) | |
5336 | btrfs_put_block_group(cache); | |
5337 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5338 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5339 | } |
5340 | ||
5341 | len = cache->key.objectid + cache->key.offset - start; | |
5342 | len = min(len, end + 1 - start); | |
5343 | ||
5344 | if (start < cache->last_byte_to_unpin) { | |
5345 | len = min(len, cache->last_byte_to_unpin - start); | |
5346 | btrfs_add_free_space(cache, start, len); | |
5347 | } | |
5348 | ||
f0486c68 | 5349 | start += len; |
7b398f8e | 5350 | space_info = cache->space_info; |
f0486c68 | 5351 | |
7b398f8e | 5352 | spin_lock(&space_info->lock); |
11833d66 YZ |
5353 | spin_lock(&cache->lock); |
5354 | cache->pinned -= len; | |
7b398f8e JB |
5355 | space_info->bytes_pinned -= len; |
5356 | if (cache->ro) { | |
5357 | space_info->bytes_readonly += len; | |
5358 | readonly = true; | |
5359 | } | |
11833d66 | 5360 | spin_unlock(&cache->lock); |
7b398f8e JB |
5361 | if (!readonly && global_rsv->space_info == space_info) { |
5362 | spin_lock(&global_rsv->lock); | |
5363 | if (!global_rsv->full) { | |
5364 | len = min(len, global_rsv->size - | |
5365 | global_rsv->reserved); | |
5366 | global_rsv->reserved += len; | |
5367 | space_info->bytes_may_use += len; | |
5368 | if (global_rsv->reserved >= global_rsv->size) | |
5369 | global_rsv->full = 1; | |
5370 | } | |
5371 | spin_unlock(&global_rsv->lock); | |
5372 | } | |
5373 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5374 | } |
11833d66 YZ |
5375 | |
5376 | if (cache) | |
5377 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5378 | return 0; |
5379 | } | |
5380 | ||
5381 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5382 | struct btrfs_root *root) |
a28ec197 | 5383 | { |
11833d66 YZ |
5384 | struct btrfs_fs_info *fs_info = root->fs_info; |
5385 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5386 | u64 start; |
5387 | u64 end; | |
a28ec197 | 5388 | int ret; |
a28ec197 | 5389 | |
79787eaa JM |
5390 | if (trans->aborted) |
5391 | return 0; | |
5392 | ||
11833d66 YZ |
5393 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5394 | unpin = &fs_info->freed_extents[1]; | |
5395 | else | |
5396 | unpin = &fs_info->freed_extents[0]; | |
5397 | ||
d397712b | 5398 | while (1) { |
1a5bc167 | 5399 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5400 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5401 | if (ret) |
a28ec197 | 5402 | break; |
1f3c79a2 | 5403 | |
5378e607 LD |
5404 | if (btrfs_test_opt(root, DISCARD)) |
5405 | ret = btrfs_discard_extent(root, start, | |
5406 | end + 1 - start, NULL); | |
1f3c79a2 | 5407 | |
1a5bc167 | 5408 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5409 | unpin_extent_range(root, start, end); |
b9473439 | 5410 | cond_resched(); |
a28ec197 | 5411 | } |
817d52f8 | 5412 | |
e20d96d6 CM |
5413 | return 0; |
5414 | } | |
5415 | ||
5d4f98a2 YZ |
5416 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5417 | struct btrfs_root *root, | |
5418 | u64 bytenr, u64 num_bytes, u64 parent, | |
5419 | u64 root_objectid, u64 owner_objectid, | |
5420 | u64 owner_offset, int refs_to_drop, | |
5421 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5422 | { |
e2fa7227 | 5423 | struct btrfs_key key; |
5d4f98a2 | 5424 | struct btrfs_path *path; |
1261ec42 CM |
5425 | struct btrfs_fs_info *info = root->fs_info; |
5426 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5427 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5428 | struct btrfs_extent_item *ei; |
5429 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5430 | int ret; |
5d4f98a2 | 5431 | int is_data; |
952fccac CM |
5432 | int extent_slot = 0; |
5433 | int found_extent = 0; | |
5434 | int num_to_del = 1; | |
5d4f98a2 YZ |
5435 | u32 item_size; |
5436 | u64 refs; | |
3173a18f JB |
5437 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
5438 | SKINNY_METADATA); | |
037e6390 | 5439 | |
5caf2a00 | 5440 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5441 | if (!path) |
5442 | return -ENOMEM; | |
5f26f772 | 5443 | |
3c12ac72 | 5444 | path->reada = 1; |
b9473439 | 5445 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5446 | |
5447 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5448 | BUG_ON(!is_data && refs_to_drop != 1); | |
5449 | ||
3173a18f JB |
5450 | if (is_data) |
5451 | skinny_metadata = 0; | |
5452 | ||
5d4f98a2 YZ |
5453 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
5454 | bytenr, num_bytes, parent, | |
5455 | root_objectid, owner_objectid, | |
5456 | owner_offset); | |
7bb86316 | 5457 | if (ret == 0) { |
952fccac | 5458 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5459 | while (extent_slot >= 0) { |
5460 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5461 | extent_slot); |
5d4f98a2 | 5462 | if (key.objectid != bytenr) |
952fccac | 5463 | break; |
5d4f98a2 YZ |
5464 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5465 | key.offset == num_bytes) { | |
952fccac CM |
5466 | found_extent = 1; |
5467 | break; | |
5468 | } | |
3173a18f JB |
5469 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
5470 | key.offset == owner_objectid) { | |
5471 | found_extent = 1; | |
5472 | break; | |
5473 | } | |
952fccac CM |
5474 | if (path->slots[0] - extent_slot > 5) |
5475 | break; | |
5d4f98a2 | 5476 | extent_slot--; |
952fccac | 5477 | } |
5d4f98a2 YZ |
5478 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5479 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5480 | if (found_extent && item_size < sizeof(*ei)) | |
5481 | found_extent = 0; | |
5482 | #endif | |
31840ae1 | 5483 | if (!found_extent) { |
5d4f98a2 | 5484 | BUG_ON(iref); |
56bec294 | 5485 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5486 | NULL, refs_to_drop, |
5487 | is_data); | |
005d6427 DS |
5488 | if (ret) { |
5489 | btrfs_abort_transaction(trans, extent_root, ret); | |
5490 | goto out; | |
5491 | } | |
b3b4aa74 | 5492 | btrfs_release_path(path); |
b9473439 | 5493 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5494 | |
5495 | key.objectid = bytenr; | |
5496 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5497 | key.offset = num_bytes; | |
5498 | ||
3173a18f JB |
5499 | if (!is_data && skinny_metadata) { |
5500 | key.type = BTRFS_METADATA_ITEM_KEY; | |
5501 | key.offset = owner_objectid; | |
5502 | } | |
5503 | ||
31840ae1 ZY |
5504 | ret = btrfs_search_slot(trans, extent_root, |
5505 | &key, path, -1, 1); | |
3173a18f JB |
5506 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
5507 | /* | |
5508 | * Couldn't find our skinny metadata item, | |
5509 | * see if we have ye olde extent item. | |
5510 | */ | |
5511 | path->slots[0]--; | |
5512 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
5513 | path->slots[0]); | |
5514 | if (key.objectid == bytenr && | |
5515 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
5516 | key.offset == num_bytes) | |
5517 | ret = 0; | |
5518 | } | |
5519 | ||
5520 | if (ret > 0 && skinny_metadata) { | |
5521 | skinny_metadata = false; | |
5522 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5523 | key.offset = num_bytes; | |
5524 | btrfs_release_path(path); | |
5525 | ret = btrfs_search_slot(trans, extent_root, | |
5526 | &key, path, -1, 1); | |
5527 | } | |
5528 | ||
f3465ca4 | 5529 | if (ret) { |
c2cf52eb SK |
5530 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5531 | ret, (unsigned long long)bytenr); | |
b783e62d JB |
5532 | if (ret > 0) |
5533 | btrfs_print_leaf(extent_root, | |
5534 | path->nodes[0]); | |
f3465ca4 | 5535 | } |
005d6427 DS |
5536 | if (ret < 0) { |
5537 | btrfs_abort_transaction(trans, extent_root, ret); | |
5538 | goto out; | |
5539 | } | |
31840ae1 ZY |
5540 | extent_slot = path->slots[0]; |
5541 | } | |
79787eaa | 5542 | } else if (ret == -ENOENT) { |
7bb86316 CM |
5543 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5544 | WARN_ON(1); | |
c2cf52eb SK |
5545 | btrfs_err(info, |
5546 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
5547 | (unsigned long long)bytenr, | |
5548 | (unsigned long long)parent, | |
5549 | (unsigned long long)root_objectid, | |
5550 | (unsigned long long)owner_objectid, | |
5551 | (unsigned long long)owner_offset); | |
79787eaa | 5552 | } else { |
005d6427 DS |
5553 | btrfs_abort_transaction(trans, extent_root, ret); |
5554 | goto out; | |
7bb86316 | 5555 | } |
5f39d397 CM |
5556 | |
5557 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5558 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5559 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5560 | if (item_size < sizeof(*ei)) { | |
5561 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5562 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5563 | owner_objectid, 0); | |
005d6427 DS |
5564 | if (ret < 0) { |
5565 | btrfs_abort_transaction(trans, extent_root, ret); | |
5566 | goto out; | |
5567 | } | |
5d4f98a2 | 5568 | |
b3b4aa74 | 5569 | btrfs_release_path(path); |
5d4f98a2 YZ |
5570 | path->leave_spinning = 1; |
5571 | ||
5572 | key.objectid = bytenr; | |
5573 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5574 | key.offset = num_bytes; | |
5575 | ||
5576 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5577 | -1, 1); | |
5578 | if (ret) { | |
c2cf52eb SK |
5579 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5580 | ret, (unsigned long long)bytenr); | |
5d4f98a2 YZ |
5581 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5582 | } | |
005d6427 DS |
5583 | if (ret < 0) { |
5584 | btrfs_abort_transaction(trans, extent_root, ret); | |
5585 | goto out; | |
5586 | } | |
5587 | ||
5d4f98a2 YZ |
5588 | extent_slot = path->slots[0]; |
5589 | leaf = path->nodes[0]; | |
5590 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5591 | } | |
5592 | #endif | |
5593 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5594 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5595 | struct btrfs_extent_item); |
3173a18f JB |
5596 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
5597 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
5598 | struct btrfs_tree_block_info *bi; |
5599 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5600 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5601 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5602 | } | |
56bec294 | 5603 | |
5d4f98a2 | 5604 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
5605 | if (refs < refs_to_drop) { |
5606 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
5607 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); | |
5608 | ret = -EINVAL; | |
5609 | btrfs_abort_transaction(trans, extent_root, ret); | |
5610 | goto out; | |
5611 | } | |
56bec294 | 5612 | refs -= refs_to_drop; |
5f39d397 | 5613 | |
5d4f98a2 YZ |
5614 | if (refs > 0) { |
5615 | if (extent_op) | |
5616 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5617 | /* | |
5618 | * In the case of inline back ref, reference count will | |
5619 | * be updated by remove_extent_backref | |
952fccac | 5620 | */ |
5d4f98a2 YZ |
5621 | if (iref) { |
5622 | BUG_ON(!found_extent); | |
5623 | } else { | |
5624 | btrfs_set_extent_refs(leaf, ei, refs); | |
5625 | btrfs_mark_buffer_dirty(leaf); | |
5626 | } | |
5627 | if (found_extent) { | |
5628 | ret = remove_extent_backref(trans, extent_root, path, | |
5629 | iref, refs_to_drop, | |
5630 | is_data); | |
005d6427 DS |
5631 | if (ret) { |
5632 | btrfs_abort_transaction(trans, extent_root, ret); | |
5633 | goto out; | |
5634 | } | |
952fccac | 5635 | } |
5d4f98a2 | 5636 | } else { |
5d4f98a2 YZ |
5637 | if (found_extent) { |
5638 | BUG_ON(is_data && refs_to_drop != | |
5639 | extent_data_ref_count(root, path, iref)); | |
5640 | if (iref) { | |
5641 | BUG_ON(path->slots[0] != extent_slot); | |
5642 | } else { | |
5643 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5644 | path->slots[0] = extent_slot; | |
5645 | num_to_del = 2; | |
5646 | } | |
78fae27e | 5647 | } |
b9473439 | 5648 | |
952fccac CM |
5649 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5650 | num_to_del); | |
005d6427 DS |
5651 | if (ret) { |
5652 | btrfs_abort_transaction(trans, extent_root, ret); | |
5653 | goto out; | |
5654 | } | |
b3b4aa74 | 5655 | btrfs_release_path(path); |
21af804c | 5656 | |
5d4f98a2 | 5657 | if (is_data) { |
459931ec | 5658 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5659 | if (ret) { |
5660 | btrfs_abort_transaction(trans, extent_root, ret); | |
5661 | goto out; | |
5662 | } | |
459931ec CM |
5663 | } |
5664 | ||
c53d613e | 5665 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5666 | if (ret) { |
5667 | btrfs_abort_transaction(trans, extent_root, ret); | |
5668 | goto out; | |
5669 | } | |
a28ec197 | 5670 | } |
79787eaa | 5671 | out: |
5caf2a00 | 5672 | btrfs_free_path(path); |
a28ec197 CM |
5673 | return ret; |
5674 | } | |
5675 | ||
1887be66 | 5676 | /* |
f0486c68 | 5677 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5678 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5679 | * a given extent, and if there are no other delayed refs to be processed, it | |
5680 | * removes it from the tree. | |
5681 | */ | |
5682 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5683 | struct btrfs_root *root, u64 bytenr) | |
5684 | { | |
5685 | struct btrfs_delayed_ref_head *head; | |
5686 | struct btrfs_delayed_ref_root *delayed_refs; | |
5687 | struct btrfs_delayed_ref_node *ref; | |
5688 | struct rb_node *node; | |
f0486c68 | 5689 | int ret = 0; |
1887be66 CM |
5690 | |
5691 | delayed_refs = &trans->transaction->delayed_refs; | |
5692 | spin_lock(&delayed_refs->lock); | |
5693 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5694 | if (!head) | |
5695 | goto out; | |
5696 | ||
5697 | node = rb_prev(&head->node.rb_node); | |
5698 | if (!node) | |
5699 | goto out; | |
5700 | ||
5701 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
5702 | ||
5703 | /* there are still entries for this ref, we can't drop it */ | |
5704 | if (ref->bytenr == bytenr) | |
5705 | goto out; | |
5706 | ||
5d4f98a2 YZ |
5707 | if (head->extent_op) { |
5708 | if (!head->must_insert_reserved) | |
5709 | goto out; | |
78a6184a | 5710 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5711 | head->extent_op = NULL; |
5712 | } | |
5713 | ||
1887be66 CM |
5714 | /* |
5715 | * waiting for the lock here would deadlock. If someone else has it | |
5716 | * locked they are already in the process of dropping it anyway | |
5717 | */ | |
5718 | if (!mutex_trylock(&head->mutex)) | |
5719 | goto out; | |
5720 | ||
5721 | /* | |
5722 | * at this point we have a head with no other entries. Go | |
5723 | * ahead and process it. | |
5724 | */ | |
5725 | head->node.in_tree = 0; | |
5726 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 5727 | |
1887be66 CM |
5728 | delayed_refs->num_entries--; |
5729 | ||
5730 | /* | |
5731 | * we don't take a ref on the node because we're removing it from the | |
5732 | * tree, so we just steal the ref the tree was holding. | |
5733 | */ | |
c3e69d58 CM |
5734 | delayed_refs->num_heads--; |
5735 | if (list_empty(&head->cluster)) | |
5736 | delayed_refs->num_heads_ready--; | |
5737 | ||
5738 | list_del_init(&head->cluster); | |
1887be66 CM |
5739 | spin_unlock(&delayed_refs->lock); |
5740 | ||
f0486c68 YZ |
5741 | BUG_ON(head->extent_op); |
5742 | if (head->must_insert_reserved) | |
5743 | ret = 1; | |
5744 | ||
5745 | mutex_unlock(&head->mutex); | |
1887be66 | 5746 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5747 | return ret; |
1887be66 CM |
5748 | out: |
5749 | spin_unlock(&delayed_refs->lock); | |
5750 | return 0; | |
5751 | } | |
5752 | ||
f0486c68 YZ |
5753 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5754 | struct btrfs_root *root, | |
5755 | struct extent_buffer *buf, | |
5581a51a | 5756 | u64 parent, int last_ref) |
f0486c68 | 5757 | { |
f0486c68 YZ |
5758 | struct btrfs_block_group_cache *cache = NULL; |
5759 | int ret; | |
5760 | ||
5761 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5762 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5763 | buf->start, buf->len, | |
5764 | parent, root->root_key.objectid, | |
5765 | btrfs_header_level(buf), | |
5581a51a | 5766 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5767 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5768 | } |
5769 | ||
5770 | if (!last_ref) | |
5771 | return; | |
5772 | ||
f0486c68 | 5773 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5774 | |
5775 | if (btrfs_header_generation(buf) == trans->transid) { | |
5776 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5777 | ret = check_ref_cleanup(trans, root, buf->start); | |
5778 | if (!ret) | |
37be25bc | 5779 | goto out; |
f0486c68 YZ |
5780 | } |
5781 | ||
5782 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5783 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5784 | goto out; |
f0486c68 YZ |
5785 | } |
5786 | ||
5787 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5788 | ||
5789 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5790 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
f0486c68 YZ |
5791 | } |
5792 | out: | |
a826d6dc JB |
5793 | /* |
5794 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5795 | * anymore. | |
5796 | */ | |
5797 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
5798 | btrfs_put_block_group(cache); |
5799 | } | |
5800 | ||
79787eaa | 5801 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
5802 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5803 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
5804 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
5805 | { |
5806 | int ret; | |
66d7e7f0 | 5807 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 5808 | |
56bec294 CM |
5809 | /* |
5810 | * tree log blocks never actually go into the extent allocation | |
5811 | * tree, just update pinning info and exit early. | |
56bec294 | 5812 | */ |
5d4f98a2 YZ |
5813 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
5814 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 5815 | /* unlocks the pinned mutex */ |
11833d66 | 5816 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 5817 | ret = 0; |
5d4f98a2 | 5818 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
5819 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
5820 | num_bytes, | |
5d4f98a2 | 5821 | parent, root_objectid, (int)owner, |
66d7e7f0 | 5822 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 5823 | } else { |
66d7e7f0 AJ |
5824 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
5825 | num_bytes, | |
5826 | parent, root_objectid, owner, | |
5827 | offset, BTRFS_DROP_DELAYED_REF, | |
5828 | NULL, for_cow); | |
56bec294 | 5829 | } |
925baedd CM |
5830 | return ret; |
5831 | } | |
5832 | ||
53b381b3 DW |
5833 | static u64 stripe_align(struct btrfs_root *root, |
5834 | struct btrfs_block_group_cache *cache, | |
5835 | u64 val, u64 num_bytes) | |
87ee04eb | 5836 | { |
fda2832f | 5837 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
5838 | return ret; |
5839 | } | |
5840 | ||
817d52f8 JB |
5841 | /* |
5842 | * when we wait for progress in the block group caching, its because | |
5843 | * our allocation attempt failed at least once. So, we must sleep | |
5844 | * and let some progress happen before we try again. | |
5845 | * | |
5846 | * This function will sleep at least once waiting for new free space to | |
5847 | * show up, and then it will check the block group free space numbers | |
5848 | * for our min num_bytes. Another option is to have it go ahead | |
5849 | * and look in the rbtree for a free extent of a given size, but this | |
5850 | * is a good start. | |
5851 | */ | |
5852 | static noinline int | |
5853 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
5854 | u64 num_bytes) | |
5855 | { | |
11833d66 | 5856 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 5857 | |
11833d66 YZ |
5858 | caching_ctl = get_caching_control(cache); |
5859 | if (!caching_ctl) | |
817d52f8 | 5860 | return 0; |
817d52f8 | 5861 | |
11833d66 | 5862 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 5863 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
5864 | |
5865 | put_caching_control(caching_ctl); | |
5866 | return 0; | |
5867 | } | |
5868 | ||
5869 | static noinline int | |
5870 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
5871 | { | |
5872 | struct btrfs_caching_control *caching_ctl; | |
11833d66 YZ |
5873 | |
5874 | caching_ctl = get_caching_control(cache); | |
5875 | if (!caching_ctl) | |
5876 | return 0; | |
5877 | ||
5878 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
5879 | ||
5880 | put_caching_control(caching_ctl); | |
817d52f8 JB |
5881 | return 0; |
5882 | } | |
5883 | ||
31e50229 | 5884 | int __get_raid_index(u64 flags) |
b742bb82 | 5885 | { |
7738a53a | 5886 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 5887 | return BTRFS_RAID_RAID10; |
7738a53a | 5888 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 5889 | return BTRFS_RAID_RAID1; |
7738a53a | 5890 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 5891 | return BTRFS_RAID_DUP; |
7738a53a | 5892 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 5893 | return BTRFS_RAID_RAID0; |
53b381b3 | 5894 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 5895 | return BTRFS_RAID_RAID5; |
53b381b3 | 5896 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 5897 | return BTRFS_RAID_RAID6; |
7738a53a | 5898 | |
e942f883 | 5899 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
5900 | } |
5901 | ||
7738a53a ID |
5902 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
5903 | { | |
31e50229 | 5904 | return __get_raid_index(cache->flags); |
7738a53a ID |
5905 | } |
5906 | ||
817d52f8 | 5907 | enum btrfs_loop_type { |
285ff5af JB |
5908 | LOOP_CACHING_NOWAIT = 0, |
5909 | LOOP_CACHING_WAIT = 1, | |
5910 | LOOP_ALLOC_CHUNK = 2, | |
5911 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
5912 | }; |
5913 | ||
fec577fb CM |
5914 | /* |
5915 | * walks the btree of allocated extents and find a hole of a given size. | |
5916 | * The key ins is changed to record the hole: | |
5917 | * ins->objectid == block start | |
62e2749e | 5918 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
5919 | * ins->offset == number of blocks |
5920 | * Any available blocks before search_start are skipped. | |
5921 | */ | |
d397712b | 5922 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
5923 | struct btrfs_root *orig_root, |
5924 | u64 num_bytes, u64 empty_size, | |
98ed5174 | 5925 | u64 hint_byte, struct btrfs_key *ins, |
e0f54067 | 5926 | u64 data) |
fec577fb | 5927 | { |
80eb234a | 5928 | int ret = 0; |
d397712b | 5929 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 5930 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 5931 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 5932 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 5933 | u64 search_start = 0; |
239b14b3 | 5934 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 5935 | struct btrfs_space_info *space_info; |
fa9c0d79 | 5936 | int loop = 0; |
ac5c9300 | 5937 | int index = __get_raid_index(data); |
fb25e914 JB |
5938 | int alloc_type = (data & BTRFS_BLOCK_GROUP_DATA) ? |
5939 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
817d52f8 | 5940 | bool found_uncached_bg = false; |
0a24325e | 5941 | bool failed_cluster_refill = false; |
1cdda9b8 | 5942 | bool failed_alloc = false; |
67377734 | 5943 | bool use_cluster = true; |
60d2adbb | 5944 | bool have_caching_bg = false; |
fec577fb | 5945 | |
db94535d | 5946 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 5947 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
5948 | ins->objectid = 0; |
5949 | ins->offset = 0; | |
b1a4d965 | 5950 | |
3f7de037 JB |
5951 | trace_find_free_extent(orig_root, num_bytes, empty_size, data); |
5952 | ||
2552d17e | 5953 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 | 5954 | if (!space_info) { |
c2cf52eb | 5955 | btrfs_err(root->fs_info, "No space info for %llu", data); |
1b1d1f66 JB |
5956 | return -ENOSPC; |
5957 | } | |
2552d17e | 5958 | |
67377734 JB |
5959 | /* |
5960 | * If the space info is for both data and metadata it means we have a | |
5961 | * small filesystem and we can't use the clustering stuff. | |
5962 | */ | |
5963 | if (btrfs_mixed_space_info(space_info)) | |
5964 | use_cluster = false; | |
5965 | ||
67377734 | 5966 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 5967 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
5968 | if (!btrfs_test_opt(root, SSD)) |
5969 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
5970 | } |
5971 | ||
67377734 JB |
5972 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
5973 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
5974 | last_ptr = &root->fs_info->data_alloc_cluster; |
5975 | } | |
0f9dd46c | 5976 | |
239b14b3 | 5977 | if (last_ptr) { |
fa9c0d79 CM |
5978 | spin_lock(&last_ptr->lock); |
5979 | if (last_ptr->block_group) | |
5980 | hint_byte = last_ptr->window_start; | |
5981 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 5982 | } |
fa9c0d79 | 5983 | |
a061fc8d | 5984 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 5985 | search_start = max(search_start, hint_byte); |
0b86a832 | 5986 | |
817d52f8 | 5987 | if (!last_ptr) |
fa9c0d79 | 5988 | empty_cluster = 0; |
fa9c0d79 | 5989 | |
2552d17e | 5990 | if (search_start == hint_byte) { |
2552d17e JB |
5991 | block_group = btrfs_lookup_block_group(root->fs_info, |
5992 | search_start); | |
274bd4fb | 5993 | used_block_group = block_group; |
817d52f8 JB |
5994 | /* |
5995 | * we don't want to use the block group if it doesn't match our | |
5996 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
5997 | * |
5998 | * However if we are re-searching with an ideal block group | |
5999 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
6000 | */ |
6001 | if (block_group && block_group_bits(block_group, data) && | |
285ff5af | 6002 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6003 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6004 | if (list_empty(&block_group->list) || |
6005 | block_group->ro) { | |
6006 | /* | |
6007 | * someone is removing this block group, | |
6008 | * we can't jump into the have_block_group | |
6009 | * target because our list pointers are not | |
6010 | * valid | |
6011 | */ | |
6012 | btrfs_put_block_group(block_group); | |
6013 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6014 | } else { |
b742bb82 | 6015 | index = get_block_group_index(block_group); |
44fb5511 | 6016 | goto have_block_group; |
ccf0e725 | 6017 | } |
2552d17e | 6018 | } else if (block_group) { |
fa9c0d79 | 6019 | btrfs_put_block_group(block_group); |
2552d17e | 6020 | } |
42e70e7a | 6021 | } |
2552d17e | 6022 | search: |
60d2adbb | 6023 | have_caching_bg = false; |
80eb234a | 6024 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6025 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6026 | list) { | |
6226cb0a | 6027 | u64 offset; |
817d52f8 | 6028 | int cached; |
8a1413a2 | 6029 | |
274bd4fb | 6030 | used_block_group = block_group; |
11dfe35a | 6031 | btrfs_get_block_group(block_group); |
2552d17e | 6032 | search_start = block_group->key.objectid; |
42e70e7a | 6033 | |
83a50de9 CM |
6034 | /* |
6035 | * this can happen if we end up cycling through all the | |
6036 | * raid types, but we want to make sure we only allocate | |
6037 | * for the proper type. | |
6038 | */ | |
6039 | if (!block_group_bits(block_group, data)) { | |
6040 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
6041 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6042 | BTRFS_BLOCK_GROUP_RAID5 | |
6043 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6044 | BTRFS_BLOCK_GROUP_RAID10; |
6045 | ||
6046 | /* | |
6047 | * if they asked for extra copies and this block group | |
6048 | * doesn't provide them, bail. This does allow us to | |
6049 | * fill raid0 from raid1. | |
6050 | */ | |
6051 | if ((data & extra) && !(block_group->flags & extra)) | |
6052 | goto loop; | |
6053 | } | |
6054 | ||
2552d17e | 6055 | have_block_group: |
291c7d2f JB |
6056 | cached = block_group_cache_done(block_group); |
6057 | if (unlikely(!cached)) { | |
291c7d2f | 6058 | found_uncached_bg = true; |
f6373bf3 | 6059 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6060 | BUG_ON(ret < 0); |
6061 | ret = 0; | |
817d52f8 JB |
6062 | } |
6063 | ||
ea6a478e | 6064 | if (unlikely(block_group->ro)) |
2552d17e | 6065 | goto loop; |
0f9dd46c | 6066 | |
0a24325e | 6067 | /* |
062c05c4 AO |
6068 | * Ok we want to try and use the cluster allocator, so |
6069 | * lets look there | |
0a24325e | 6070 | */ |
062c05c4 | 6071 | if (last_ptr) { |
8de972b4 | 6072 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6073 | /* |
6074 | * the refill lock keeps out other | |
6075 | * people trying to start a new cluster | |
6076 | */ | |
6077 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
6078 | used_block_group = last_ptr->block_group; |
6079 | if (used_block_group != block_group && | |
6080 | (!used_block_group || | |
6081 | used_block_group->ro || | |
6082 | !block_group_bits(used_block_group, data))) { | |
6083 | used_block_group = block_group; | |
44fb5511 | 6084 | goto refill_cluster; |
274bd4fb AO |
6085 | } |
6086 | ||
6087 | if (used_block_group != block_group) | |
6088 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 6089 | |
274bd4fb AO |
6090 | offset = btrfs_alloc_from_cluster(used_block_group, |
6091 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
6092 | if (offset) { |
6093 | /* we have a block, we're done */ | |
6094 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6095 | trace_btrfs_reserve_extent_cluster(root, |
6096 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
6097 | goto checks; |
6098 | } | |
6099 | ||
274bd4fb AO |
6100 | WARN_ON(last_ptr->block_group != used_block_group); |
6101 | if (used_block_group != block_group) { | |
6102 | btrfs_put_block_group(used_block_group); | |
6103 | used_block_group = block_group; | |
fa9c0d79 | 6104 | } |
44fb5511 | 6105 | refill_cluster: |
274bd4fb | 6106 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
6107 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
6108 | * set up a new clusters, so lets just skip it | |
6109 | * and let the allocator find whatever block | |
6110 | * it can find. If we reach this point, we | |
6111 | * will have tried the cluster allocator | |
6112 | * plenty of times and not have found | |
6113 | * anything, so we are likely way too | |
6114 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
6115 | * anything. |
6116 | * | |
6117 | * However, if the cluster is taken from the | |
6118 | * current block group, release the cluster | |
6119 | * first, so that we stand a better chance of | |
6120 | * succeeding in the unclustered | |
6121 | * allocation. */ | |
6122 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6123 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
6124 | spin_unlock(&last_ptr->refill_lock); |
6125 | goto unclustered_alloc; | |
6126 | } | |
6127 | ||
fa9c0d79 CM |
6128 | /* |
6129 | * this cluster didn't work out, free it and | |
6130 | * start over | |
6131 | */ | |
6132 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6133 | ||
a5f6f719 AO |
6134 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
6135 | spin_unlock(&last_ptr->refill_lock); | |
6136 | goto unclustered_alloc; | |
6137 | } | |
6138 | ||
8de972b4 CM |
6139 | aligned_cluster = max_t(unsigned long, |
6140 | empty_cluster + empty_size, | |
6141 | block_group->full_stripe_len); | |
6142 | ||
fa9c0d79 | 6143 | /* allocate a cluster in this block group */ |
451d7585 | 6144 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 6145 | block_group, last_ptr, |
1b22bad7 | 6146 | search_start, num_bytes, |
8de972b4 | 6147 | aligned_cluster); |
fa9c0d79 CM |
6148 | if (ret == 0) { |
6149 | /* | |
6150 | * now pull our allocation out of this | |
6151 | * cluster | |
6152 | */ | |
6153 | offset = btrfs_alloc_from_cluster(block_group, | |
6154 | last_ptr, num_bytes, | |
6155 | search_start); | |
6156 | if (offset) { | |
6157 | /* we found one, proceed */ | |
6158 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6159 | trace_btrfs_reserve_extent_cluster(root, |
6160 | block_group, search_start, | |
6161 | num_bytes); | |
fa9c0d79 CM |
6162 | goto checks; |
6163 | } | |
0a24325e JB |
6164 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6165 | && !failed_cluster_refill) { | |
817d52f8 JB |
6166 | spin_unlock(&last_ptr->refill_lock); |
6167 | ||
0a24325e | 6168 | failed_cluster_refill = true; |
817d52f8 JB |
6169 | wait_block_group_cache_progress(block_group, |
6170 | num_bytes + empty_cluster + empty_size); | |
6171 | goto have_block_group; | |
fa9c0d79 | 6172 | } |
817d52f8 | 6173 | |
fa9c0d79 CM |
6174 | /* |
6175 | * at this point we either didn't find a cluster | |
6176 | * or we weren't able to allocate a block from our | |
6177 | * cluster. Free the cluster we've been trying | |
6178 | * to use, and go to the next block group | |
6179 | */ | |
0a24325e | 6180 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6181 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6182 | goto loop; |
fa9c0d79 CM |
6183 | } |
6184 | ||
062c05c4 | 6185 | unclustered_alloc: |
a5f6f719 AO |
6186 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6187 | if (cached && | |
6188 | block_group->free_space_ctl->free_space < | |
6189 | num_bytes + empty_cluster + empty_size) { | |
6190 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6191 | goto loop; | |
6192 | } | |
6193 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6194 | ||
6226cb0a JB |
6195 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
6196 | num_bytes, empty_size); | |
1cdda9b8 JB |
6197 | /* |
6198 | * If we didn't find a chunk, and we haven't failed on this | |
6199 | * block group before, and this block group is in the middle of | |
6200 | * caching and we are ok with waiting, then go ahead and wait | |
6201 | * for progress to be made, and set failed_alloc to true. | |
6202 | * | |
6203 | * If failed_alloc is true then we've already waited on this | |
6204 | * block group once and should move on to the next block group. | |
6205 | */ | |
6206 | if (!offset && !failed_alloc && !cached && | |
6207 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6208 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6209 | num_bytes + empty_size); |
6210 | failed_alloc = true; | |
817d52f8 | 6211 | goto have_block_group; |
1cdda9b8 | 6212 | } else if (!offset) { |
60d2adbb MX |
6213 | if (!cached) |
6214 | have_caching_bg = true; | |
1cdda9b8 | 6215 | goto loop; |
817d52f8 | 6216 | } |
fa9c0d79 | 6217 | checks: |
53b381b3 DW |
6218 | search_start = stripe_align(root, used_block_group, |
6219 | offset, num_bytes); | |
25179201 | 6220 | |
2552d17e JB |
6221 | /* move on to the next group */ |
6222 | if (search_start + num_bytes > | |
274bd4fb AO |
6223 | used_block_group->key.objectid + used_block_group->key.offset) { |
6224 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 6225 | goto loop; |
6226cb0a | 6226 | } |
f5a31e16 | 6227 | |
f0486c68 | 6228 | if (offset < search_start) |
274bd4fb | 6229 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
6230 | search_start - offset); |
6231 | BUG_ON(offset > search_start); | |
2552d17e | 6232 | |
274bd4fb | 6233 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 6234 | alloc_type); |
f0486c68 | 6235 | if (ret == -EAGAIN) { |
274bd4fb | 6236 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 6237 | goto loop; |
0f9dd46c | 6238 | } |
0b86a832 | 6239 | |
f0486c68 | 6240 | /* we are all good, lets return */ |
2552d17e JB |
6241 | ins->objectid = search_start; |
6242 | ins->offset = num_bytes; | |
d2fb3437 | 6243 | |
3f7de037 JB |
6244 | trace_btrfs_reserve_extent(orig_root, block_group, |
6245 | search_start, num_bytes); | |
274bd4fb AO |
6246 | if (used_block_group != block_group) |
6247 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 6248 | btrfs_put_block_group(block_group); |
2552d17e JB |
6249 | break; |
6250 | loop: | |
0a24325e | 6251 | failed_cluster_refill = false; |
1cdda9b8 | 6252 | failed_alloc = false; |
b742bb82 | 6253 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
6254 | if (used_block_group != block_group) |
6255 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 6256 | btrfs_put_block_group(block_group); |
2552d17e JB |
6257 | } |
6258 | up_read(&space_info->groups_sem); | |
6259 | ||
60d2adbb MX |
6260 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6261 | goto search; | |
6262 | ||
b742bb82 YZ |
6263 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6264 | goto search; | |
6265 | ||
285ff5af | 6266 | /* |
ccf0e725 JB |
6267 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6268 | * caching kthreads as we move along | |
817d52f8 JB |
6269 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6270 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6271 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6272 | * again | |
fa9c0d79 | 6273 | */ |
723bda20 | 6274 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6275 | index = 0; |
723bda20 | 6276 | loop++; |
817d52f8 | 6277 | if (loop == LOOP_ALLOC_CHUNK) { |
698d0082 | 6278 | ret = do_chunk_alloc(trans, root, data, |
ea658bad JB |
6279 | CHUNK_ALLOC_FORCE); |
6280 | /* | |
6281 | * Do not bail out on ENOSPC since we | |
6282 | * can do more things. | |
6283 | */ | |
6284 | if (ret < 0 && ret != -ENOSPC) { | |
6285 | btrfs_abort_transaction(trans, | |
6286 | root, ret); | |
6287 | goto out; | |
723bda20 | 6288 | } |
2552d17e JB |
6289 | } |
6290 | ||
723bda20 JB |
6291 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6292 | empty_size = 0; | |
6293 | empty_cluster = 0; | |
fa9c0d79 | 6294 | } |
723bda20 JB |
6295 | |
6296 | goto search; | |
2552d17e JB |
6297 | } else if (!ins->objectid) { |
6298 | ret = -ENOSPC; | |
d82a6f1d | 6299 | } else if (ins->objectid) { |
80eb234a | 6300 | ret = 0; |
be744175 | 6301 | } |
79787eaa | 6302 | out: |
be744175 | 6303 | |
0f70abe2 | 6304 | return ret; |
fec577fb | 6305 | } |
ec44a35c | 6306 | |
9ed74f2d JB |
6307 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6308 | int dump_block_groups) | |
0f9dd46c JB |
6309 | { |
6310 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6311 | int index = 0; |
0f9dd46c | 6312 | |
9ed74f2d | 6313 | spin_lock(&info->lock); |
fb25e914 JB |
6314 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
6315 | (unsigned long long)info->flags, | |
d397712b | 6316 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 6317 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 6318 | info->bytes_readonly), |
d397712b | 6319 | (info->full) ? "" : "not "); |
8929ecfa YZ |
6320 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
6321 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 6322 | (unsigned long long)info->total_bytes, |
8929ecfa | 6323 | (unsigned long long)info->bytes_used, |
21380931 | 6324 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 6325 | (unsigned long long)info->bytes_reserved, |
21380931 | 6326 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 6327 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
6328 | spin_unlock(&info->lock); |
6329 | ||
6330 | if (!dump_block_groups) | |
6331 | return; | |
0f9dd46c | 6332 | |
80eb234a | 6333 | down_read(&info->groups_sem); |
b742bb82 YZ |
6334 | again: |
6335 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6336 | spin_lock(&cache->lock); |
799ffc3c | 6337 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
d397712b CM |
6338 | (unsigned long long)cache->key.objectid, |
6339 | (unsigned long long)cache->key.offset, | |
6340 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
6341 | (unsigned long long)cache->pinned, | |
799ffc3c LB |
6342 | (unsigned long long)cache->reserved, |
6343 | cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6344 | btrfs_dump_free_space(cache, bytes); |
6345 | spin_unlock(&cache->lock); | |
6346 | } | |
b742bb82 YZ |
6347 | if (++index < BTRFS_NR_RAID_TYPES) |
6348 | goto again; | |
80eb234a | 6349 | up_read(&info->groups_sem); |
0f9dd46c | 6350 | } |
e8569813 | 6351 | |
11833d66 YZ |
6352 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
6353 | struct btrfs_root *root, | |
6354 | u64 num_bytes, u64 min_alloc_size, | |
6355 | u64 empty_size, u64 hint_byte, | |
81c9ad23 | 6356 | struct btrfs_key *ins, u64 data) |
fec577fb | 6357 | { |
9e622d6b | 6358 | bool final_tried = false; |
fec577fb | 6359 | int ret; |
925baedd | 6360 | |
6a63209f | 6361 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 6362 | again: |
db94535d CM |
6363 | WARN_ON(num_bytes < root->sectorsize); |
6364 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
81c9ad23 | 6365 | hint_byte, ins, data); |
3b951516 | 6366 | |
9e622d6b MX |
6367 | if (ret == -ENOSPC) { |
6368 | if (!final_tried) { | |
6369 | num_bytes = num_bytes >> 1; | |
24542bf7 | 6370 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6371 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6372 | if (num_bytes == min_alloc_size) |
6373 | final_tried = true; | |
6374 | goto again; | |
6375 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6376 | struct btrfs_space_info *sinfo; | |
6377 | ||
6378 | sinfo = __find_space_info(root->fs_info, data); | |
c2cf52eb SK |
6379 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
6380 | (unsigned long long)data, | |
6381 | (unsigned long long)num_bytes); | |
53804280 JM |
6382 | if (sinfo) |
6383 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6384 | } |
925baedd | 6385 | } |
0f9dd46c | 6386 | |
1abe9b8a | 6387 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
6388 | ||
0f9dd46c | 6389 | return ret; |
e6dcd2dc CM |
6390 | } |
6391 | ||
e688b725 CM |
6392 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6393 | u64 start, u64 len, int pin) | |
65b51a00 | 6394 | { |
0f9dd46c | 6395 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6396 | int ret = 0; |
0f9dd46c | 6397 | |
0f9dd46c JB |
6398 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6399 | if (!cache) { | |
c2cf52eb SK |
6400 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
6401 | (unsigned long long)start); | |
0f9dd46c JB |
6402 | return -ENOSPC; |
6403 | } | |
1f3c79a2 | 6404 | |
5378e607 LD |
6405 | if (btrfs_test_opt(root, DISCARD)) |
6406 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6407 | |
e688b725 CM |
6408 | if (pin) |
6409 | pin_down_extent(root, cache, start, len, 1); | |
6410 | else { | |
6411 | btrfs_add_free_space(cache, start, len); | |
6412 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6413 | } | |
fa9c0d79 | 6414 | btrfs_put_block_group(cache); |
817d52f8 | 6415 | |
1abe9b8a | 6416 | trace_btrfs_reserved_extent_free(root, start, len); |
6417 | ||
e6dcd2dc CM |
6418 | return ret; |
6419 | } | |
6420 | ||
e688b725 CM |
6421 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6422 | u64 start, u64 len) | |
6423 | { | |
6424 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6425 | } | |
6426 | ||
6427 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6428 | u64 start, u64 len) | |
6429 | { | |
6430 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6431 | } | |
6432 | ||
5d4f98a2 YZ |
6433 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6434 | struct btrfs_root *root, | |
6435 | u64 parent, u64 root_objectid, | |
6436 | u64 flags, u64 owner, u64 offset, | |
6437 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6438 | { |
6439 | int ret; | |
5d4f98a2 | 6440 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6441 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6442 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6443 | struct btrfs_path *path; |
5d4f98a2 YZ |
6444 | struct extent_buffer *leaf; |
6445 | int type; | |
6446 | u32 size; | |
26b8003f | 6447 | |
5d4f98a2 YZ |
6448 | if (parent > 0) |
6449 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6450 | else | |
6451 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6452 | |
5d4f98a2 | 6453 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6454 | |
6455 | path = btrfs_alloc_path(); | |
db5b493a TI |
6456 | if (!path) |
6457 | return -ENOMEM; | |
47e4bb98 | 6458 | |
b9473439 | 6459 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6460 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6461 | ins, size); | |
79787eaa JM |
6462 | if (ret) { |
6463 | btrfs_free_path(path); | |
6464 | return ret; | |
6465 | } | |
0f9dd46c | 6466 | |
5d4f98a2 YZ |
6467 | leaf = path->nodes[0]; |
6468 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6469 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6470 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6471 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6472 | btrfs_set_extent_flags(leaf, extent_item, | |
6473 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6474 | ||
6475 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6476 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6477 | if (parent > 0) { | |
6478 | struct btrfs_shared_data_ref *ref; | |
6479 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6480 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6481 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6482 | } else { | |
6483 | struct btrfs_extent_data_ref *ref; | |
6484 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6485 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6486 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6487 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6488 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6489 | } | |
47e4bb98 CM |
6490 | |
6491 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6492 | btrfs_free_path(path); |
f510cfec | 6493 | |
c53d613e | 6494 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6495 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6496 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6497 | (unsigned long long)ins->objectid, | |
6498 | (unsigned long long)ins->offset); | |
f5947066 CM |
6499 | BUG(); |
6500 | } | |
e6dcd2dc CM |
6501 | return ret; |
6502 | } | |
6503 | ||
5d4f98a2 YZ |
6504 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6505 | struct btrfs_root *root, | |
6506 | u64 parent, u64 root_objectid, | |
6507 | u64 flags, struct btrfs_disk_key *key, | |
6508 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6509 | { |
6510 | int ret; | |
5d4f98a2 YZ |
6511 | struct btrfs_fs_info *fs_info = root->fs_info; |
6512 | struct btrfs_extent_item *extent_item; | |
6513 | struct btrfs_tree_block_info *block_info; | |
6514 | struct btrfs_extent_inline_ref *iref; | |
6515 | struct btrfs_path *path; | |
6516 | struct extent_buffer *leaf; | |
3173a18f JB |
6517 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
6518 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6519 | SKINNY_METADATA); | |
6520 | ||
6521 | if (!skinny_metadata) | |
6522 | size += sizeof(*block_info); | |
1c2308f8 | 6523 | |
5d4f98a2 | 6524 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6525 | if (!path) |
6526 | return -ENOMEM; | |
56bec294 | 6527 | |
5d4f98a2 YZ |
6528 | path->leave_spinning = 1; |
6529 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6530 | ins, size); | |
79787eaa JM |
6531 | if (ret) { |
6532 | btrfs_free_path(path); | |
6533 | return ret; | |
6534 | } | |
5d4f98a2 YZ |
6535 | |
6536 | leaf = path->nodes[0]; | |
6537 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6538 | struct btrfs_extent_item); | |
6539 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6540 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6541 | btrfs_set_extent_flags(leaf, extent_item, | |
6542 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 6543 | |
3173a18f JB |
6544 | if (skinny_metadata) { |
6545 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6546 | } else { | |
6547 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6548 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6549 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6550 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6551 | } | |
5d4f98a2 | 6552 | |
5d4f98a2 YZ |
6553 | if (parent > 0) { |
6554 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6555 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6556 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6557 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6558 | } else { | |
6559 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6560 | BTRFS_TREE_BLOCK_REF_KEY); | |
6561 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6562 | } | |
6563 | ||
6564 | btrfs_mark_buffer_dirty(leaf); | |
6565 | btrfs_free_path(path); | |
6566 | ||
3173a18f | 6567 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
79787eaa | 6568 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6569 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6570 | (unsigned long long)ins->objectid, | |
6571 | (unsigned long long)ins->offset); | |
5d4f98a2 YZ |
6572 | BUG(); |
6573 | } | |
6574 | return ret; | |
6575 | } | |
6576 | ||
6577 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6578 | struct btrfs_root *root, | |
6579 | u64 root_objectid, u64 owner, | |
6580 | u64 offset, struct btrfs_key *ins) | |
6581 | { | |
6582 | int ret; | |
6583 | ||
6584 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6585 | ||
66d7e7f0 AJ |
6586 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6587 | ins->offset, 0, | |
6588 | root_objectid, owner, offset, | |
6589 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6590 | return ret; |
6591 | } | |
e02119d5 CM |
6592 | |
6593 | /* | |
6594 | * this is used by the tree logging recovery code. It records that | |
6595 | * an extent has been allocated and makes sure to clear the free | |
6596 | * space cache bits as well | |
6597 | */ | |
5d4f98a2 YZ |
6598 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6599 | struct btrfs_root *root, | |
6600 | u64 root_objectid, u64 owner, u64 offset, | |
6601 | struct btrfs_key *ins) | |
e02119d5 CM |
6602 | { |
6603 | int ret; | |
6604 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
6605 | struct btrfs_caching_control *caching_ctl; |
6606 | u64 start = ins->objectid; | |
6607 | u64 num_bytes = ins->offset; | |
e02119d5 | 6608 | |
e02119d5 | 6609 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
f6373bf3 | 6610 | cache_block_group(block_group, 0); |
11833d66 | 6611 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 6612 | |
11833d66 YZ |
6613 | if (!caching_ctl) { |
6614 | BUG_ON(!block_group_cache_done(block_group)); | |
6615 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
b50c6e25 JB |
6616 | if (ret) |
6617 | goto out; | |
11833d66 YZ |
6618 | } else { |
6619 | mutex_lock(&caching_ctl->mutex); | |
6620 | ||
6621 | if (start >= caching_ctl->progress) { | |
6622 | ret = add_excluded_extent(root, start, num_bytes); | |
11833d66 YZ |
6623 | } else if (start + num_bytes <= caching_ctl->progress) { |
6624 | ret = btrfs_remove_free_space(block_group, | |
6625 | start, num_bytes); | |
11833d66 YZ |
6626 | } else { |
6627 | num_bytes = caching_ctl->progress - start; | |
6628 | ret = btrfs_remove_free_space(block_group, | |
6629 | start, num_bytes); | |
b50c6e25 JB |
6630 | if (ret) |
6631 | goto out_lock; | |
11833d66 YZ |
6632 | |
6633 | start = caching_ctl->progress; | |
6634 | num_bytes = ins->objectid + ins->offset - | |
6635 | caching_ctl->progress; | |
6636 | ret = add_excluded_extent(root, start, num_bytes); | |
11833d66 | 6637 | } |
b50c6e25 | 6638 | out_lock: |
11833d66 YZ |
6639 | mutex_unlock(&caching_ctl->mutex); |
6640 | put_caching_control(caching_ctl); | |
b50c6e25 JB |
6641 | if (ret) |
6642 | goto out; | |
11833d66 YZ |
6643 | } |
6644 | ||
fb25e914 JB |
6645 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6646 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6647 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
6648 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6649 | 0, owner, offset, ins, 1); | |
b50c6e25 JB |
6650 | out: |
6651 | btrfs_put_block_group(block_group); | |
e02119d5 CM |
6652 | return ret; |
6653 | } | |
6654 | ||
65b51a00 CM |
6655 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
6656 | struct btrfs_root *root, | |
4008c04a CM |
6657 | u64 bytenr, u32 blocksize, |
6658 | int level) | |
65b51a00 CM |
6659 | { |
6660 | struct extent_buffer *buf; | |
6661 | ||
6662 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6663 | if (!buf) | |
6664 | return ERR_PTR(-ENOMEM); | |
6665 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6666 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6667 | btrfs_tree_lock(buf); |
6668 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6669 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6670 | |
6671 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6672 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6673 | |
d0c803c4 | 6674 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6675 | /* |
6676 | * we allow two log transactions at a time, use different | |
6677 | * EXENT bit to differentiate dirty pages. | |
6678 | */ | |
6679 | if (root->log_transid % 2 == 0) | |
6680 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6681 | buf->start + buf->len - 1, GFP_NOFS); | |
6682 | else | |
6683 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6684 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6685 | } else { |
6686 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6687 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6688 | } |
65b51a00 | 6689 | trans->blocks_used++; |
b4ce94de | 6690 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6691 | return buf; |
6692 | } | |
6693 | ||
f0486c68 YZ |
6694 | static struct btrfs_block_rsv * |
6695 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6696 | struct btrfs_root *root, u32 blocksize) | |
6697 | { | |
6698 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6699 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
6700 | int ret; |
6701 | ||
6702 | block_rsv = get_block_rsv(trans, root); | |
6703 | ||
6704 | if (block_rsv->size == 0) { | |
08e007d2 MX |
6705 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6706 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 JB |
6707 | /* |
6708 | * If we couldn't reserve metadata bytes try and use some from | |
6709 | * the global reserve. | |
6710 | */ | |
6711 | if (ret && block_rsv != global_rsv) { | |
6712 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6713 | if (!ret) | |
6714 | return global_rsv; | |
f0486c68 | 6715 | return ERR_PTR(ret); |
68a82277 | 6716 | } else if (ret) { |
f0486c68 | 6717 | return ERR_PTR(ret); |
68a82277 | 6718 | } |
f0486c68 YZ |
6719 | return block_rsv; |
6720 | } | |
6721 | ||
6722 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
6723 | if (!ret) | |
6724 | return block_rsv; | |
ca7e70f5 | 6725 | if (ret && !block_rsv->failfast) { |
b069e0c3 DS |
6726 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6727 | static DEFINE_RATELIMIT_STATE(_rs, | |
6728 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6729 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6730 | if (__ratelimit(&_rs)) | |
6731 | WARN(1, KERN_DEBUG | |
6732 | "btrfs: block rsv returned %d\n", ret); | |
6733 | } | |
08e007d2 MX |
6734 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6735 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 | 6736 | if (!ret) { |
68a82277 JB |
6737 | return block_rsv; |
6738 | } else if (ret && block_rsv != global_rsv) { | |
6739 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6740 | if (!ret) | |
6741 | return global_rsv; | |
6742 | } | |
6743 | } | |
f0486c68 | 6744 | |
f0486c68 YZ |
6745 | return ERR_PTR(-ENOSPC); |
6746 | } | |
6747 | ||
8c2a3ca2 JB |
6748 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6749 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6750 | { |
6751 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6752 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6753 | } |
6754 | ||
fec577fb | 6755 | /* |
f0486c68 YZ |
6756 | * finds a free extent and does all the dirty work required for allocation |
6757 | * returns the key for the extent through ins, and a tree buffer for | |
6758 | * the first block of the extent through buf. | |
6759 | * | |
fec577fb CM |
6760 | * returns the tree buffer or NULL. |
6761 | */ | |
5f39d397 | 6762 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6763 | struct btrfs_root *root, u32 blocksize, |
6764 | u64 parent, u64 root_objectid, | |
6765 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6766 | u64 hint, u64 empty_size) |
fec577fb | 6767 | { |
e2fa7227 | 6768 | struct btrfs_key ins; |
f0486c68 | 6769 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6770 | struct extent_buffer *buf; |
f0486c68 YZ |
6771 | u64 flags = 0; |
6772 | int ret; | |
3173a18f JB |
6773 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6774 | SKINNY_METADATA); | |
fec577fb | 6775 | |
f0486c68 YZ |
6776 | block_rsv = use_block_rsv(trans, root, blocksize); |
6777 | if (IS_ERR(block_rsv)) | |
6778 | return ERR_CAST(block_rsv); | |
6779 | ||
6780 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
81c9ad23 | 6781 | empty_size, hint, &ins, 0); |
fec577fb | 6782 | if (ret) { |
8c2a3ca2 | 6783 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 6784 | return ERR_PTR(ret); |
fec577fb | 6785 | } |
55c69072 | 6786 | |
4008c04a CM |
6787 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6788 | blocksize, level); | |
79787eaa | 6789 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
6790 | |
6791 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6792 | if (parent == 0) | |
6793 | parent = ins.objectid; | |
6794 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6795 | } else | |
6796 | BUG_ON(parent > 0); | |
6797 | ||
6798 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6799 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 6800 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 6801 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
6802 | if (key) |
6803 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6804 | else | |
6805 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6806 | extent_op->flags_to_set = flags; | |
3173a18f JB |
6807 | if (skinny_metadata) |
6808 | extent_op->update_key = 0; | |
6809 | else | |
6810 | extent_op->update_key = 1; | |
f0486c68 YZ |
6811 | extent_op->update_flags = 1; |
6812 | extent_op->is_data = 0; | |
6813 | ||
66d7e7f0 AJ |
6814 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6815 | ins.objectid, | |
f0486c68 YZ |
6816 | ins.offset, parent, root_objectid, |
6817 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 6818 | extent_op, 0); |
79787eaa | 6819 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 6820 | } |
fec577fb CM |
6821 | return buf; |
6822 | } | |
a28ec197 | 6823 | |
2c47e605 YZ |
6824 | struct walk_control { |
6825 | u64 refs[BTRFS_MAX_LEVEL]; | |
6826 | u64 flags[BTRFS_MAX_LEVEL]; | |
6827 | struct btrfs_key update_progress; | |
6828 | int stage; | |
6829 | int level; | |
6830 | int shared_level; | |
6831 | int update_ref; | |
6832 | int keep_locks; | |
1c4850e2 YZ |
6833 | int reada_slot; |
6834 | int reada_count; | |
66d7e7f0 | 6835 | int for_reloc; |
2c47e605 YZ |
6836 | }; |
6837 | ||
6838 | #define DROP_REFERENCE 1 | |
6839 | #define UPDATE_BACKREF 2 | |
6840 | ||
1c4850e2 YZ |
6841 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
6842 | struct btrfs_root *root, | |
6843 | struct walk_control *wc, | |
6844 | struct btrfs_path *path) | |
6407bf6d | 6845 | { |
1c4850e2 YZ |
6846 | u64 bytenr; |
6847 | u64 generation; | |
6848 | u64 refs; | |
94fcca9f | 6849 | u64 flags; |
5d4f98a2 | 6850 | u32 nritems; |
1c4850e2 YZ |
6851 | u32 blocksize; |
6852 | struct btrfs_key key; | |
6853 | struct extent_buffer *eb; | |
6407bf6d | 6854 | int ret; |
1c4850e2 YZ |
6855 | int slot; |
6856 | int nread = 0; | |
6407bf6d | 6857 | |
1c4850e2 YZ |
6858 | if (path->slots[wc->level] < wc->reada_slot) { |
6859 | wc->reada_count = wc->reada_count * 2 / 3; | |
6860 | wc->reada_count = max(wc->reada_count, 2); | |
6861 | } else { | |
6862 | wc->reada_count = wc->reada_count * 3 / 2; | |
6863 | wc->reada_count = min_t(int, wc->reada_count, | |
6864 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
6865 | } | |
7bb86316 | 6866 | |
1c4850e2 YZ |
6867 | eb = path->nodes[wc->level]; |
6868 | nritems = btrfs_header_nritems(eb); | |
6869 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 6870 | |
1c4850e2 YZ |
6871 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
6872 | if (nread >= wc->reada_count) | |
6873 | break; | |
bd56b302 | 6874 | |
2dd3e67b | 6875 | cond_resched(); |
1c4850e2 YZ |
6876 | bytenr = btrfs_node_blockptr(eb, slot); |
6877 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 6878 | |
1c4850e2 YZ |
6879 | if (slot == path->slots[wc->level]) |
6880 | goto reada; | |
5d4f98a2 | 6881 | |
1c4850e2 YZ |
6882 | if (wc->stage == UPDATE_BACKREF && |
6883 | generation <= root->root_key.offset) | |
bd56b302 CM |
6884 | continue; |
6885 | ||
94fcca9f | 6886 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
6887 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
6888 | wc->level - 1, 1, &refs, | |
6889 | &flags); | |
79787eaa JM |
6890 | /* We don't care about errors in readahead. */ |
6891 | if (ret < 0) | |
6892 | continue; | |
94fcca9f YZ |
6893 | BUG_ON(refs == 0); |
6894 | ||
1c4850e2 | 6895 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
6896 | if (refs == 1) |
6897 | goto reada; | |
bd56b302 | 6898 | |
94fcca9f YZ |
6899 | if (wc->level == 1 && |
6900 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6901 | continue; | |
1c4850e2 YZ |
6902 | if (!wc->update_ref || |
6903 | generation <= root->root_key.offset) | |
6904 | continue; | |
6905 | btrfs_node_key_to_cpu(eb, &key, slot); | |
6906 | ret = btrfs_comp_cpu_keys(&key, | |
6907 | &wc->update_progress); | |
6908 | if (ret < 0) | |
6909 | continue; | |
94fcca9f YZ |
6910 | } else { |
6911 | if (wc->level == 1 && | |
6912 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6913 | continue; | |
6407bf6d | 6914 | } |
1c4850e2 YZ |
6915 | reada: |
6916 | ret = readahead_tree_block(root, bytenr, blocksize, | |
6917 | generation); | |
6918 | if (ret) | |
bd56b302 | 6919 | break; |
1c4850e2 | 6920 | nread++; |
20524f02 | 6921 | } |
1c4850e2 | 6922 | wc->reada_slot = slot; |
20524f02 | 6923 | } |
2c47e605 | 6924 | |
f82d02d9 | 6925 | /* |
2c016dc2 | 6926 | * helper to process tree block while walking down the tree. |
2c47e605 | 6927 | * |
2c47e605 YZ |
6928 | * when wc->stage == UPDATE_BACKREF, this function updates |
6929 | * back refs for pointers in the block. | |
6930 | * | |
6931 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 6932 | */ |
2c47e605 | 6933 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 6934 | struct btrfs_root *root, |
2c47e605 | 6935 | struct btrfs_path *path, |
94fcca9f | 6936 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 6937 | { |
2c47e605 YZ |
6938 | int level = wc->level; |
6939 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 6940 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
6941 | int ret; |
6942 | ||
2c47e605 YZ |
6943 | if (wc->stage == UPDATE_BACKREF && |
6944 | btrfs_header_owner(eb) != root->root_key.objectid) | |
6945 | return 1; | |
f82d02d9 | 6946 | |
2c47e605 YZ |
6947 | /* |
6948 | * when reference count of tree block is 1, it won't increase | |
6949 | * again. once full backref flag is set, we never clear it. | |
6950 | */ | |
94fcca9f YZ |
6951 | if (lookup_info && |
6952 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
6953 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
6954 | BUG_ON(!path->locks[level]); |
6955 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 6956 | eb->start, level, 1, |
2c47e605 YZ |
6957 | &wc->refs[level], |
6958 | &wc->flags[level]); | |
79787eaa JM |
6959 | BUG_ON(ret == -ENOMEM); |
6960 | if (ret) | |
6961 | return ret; | |
2c47e605 YZ |
6962 | BUG_ON(wc->refs[level] == 0); |
6963 | } | |
5d4f98a2 | 6964 | |
2c47e605 YZ |
6965 | if (wc->stage == DROP_REFERENCE) { |
6966 | if (wc->refs[level] > 1) | |
6967 | return 1; | |
f82d02d9 | 6968 | |
2c47e605 | 6969 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 6970 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6971 | path->locks[level] = 0; |
6972 | } | |
6973 | return 0; | |
6974 | } | |
f82d02d9 | 6975 | |
2c47e605 YZ |
6976 | /* wc->stage == UPDATE_BACKREF */ |
6977 | if (!(wc->flags[level] & flag)) { | |
6978 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 6979 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 6980 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 6981 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 6982 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6983 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
6984 | eb->len, flag, 0); | |
79787eaa | 6985 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6986 | wc->flags[level] |= flag; |
6987 | } | |
6988 | ||
6989 | /* | |
6990 | * the block is shared by multiple trees, so it's not good to | |
6991 | * keep the tree lock | |
6992 | */ | |
6993 | if (path->locks[level] && level > 0) { | |
bd681513 | 6994 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6995 | path->locks[level] = 0; |
6996 | } | |
6997 | return 0; | |
6998 | } | |
6999 | ||
1c4850e2 | 7000 | /* |
2c016dc2 | 7001 | * helper to process tree block pointer. |
1c4850e2 YZ |
7002 | * |
7003 | * when wc->stage == DROP_REFERENCE, this function checks | |
7004 | * reference count of the block pointed to. if the block | |
7005 | * is shared and we need update back refs for the subtree | |
7006 | * rooted at the block, this function changes wc->stage to | |
7007 | * UPDATE_BACKREF. if the block is shared and there is no | |
7008 | * need to update back, this function drops the reference | |
7009 | * to the block. | |
7010 | * | |
7011 | * NOTE: return value 1 means we should stop walking down. | |
7012 | */ | |
7013 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
7014 | struct btrfs_root *root, | |
7015 | struct btrfs_path *path, | |
94fcca9f | 7016 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
7017 | { |
7018 | u64 bytenr; | |
7019 | u64 generation; | |
7020 | u64 parent; | |
7021 | u32 blocksize; | |
7022 | struct btrfs_key key; | |
7023 | struct extent_buffer *next; | |
7024 | int level = wc->level; | |
7025 | int reada = 0; | |
7026 | int ret = 0; | |
7027 | ||
7028 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
7029 | path->slots[level]); | |
7030 | /* | |
7031 | * if the lower level block was created before the snapshot | |
7032 | * was created, we know there is no need to update back refs | |
7033 | * for the subtree | |
7034 | */ | |
7035 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
7036 | generation <= root->root_key.offset) { |
7037 | *lookup_info = 1; | |
1c4850e2 | 7038 | return 1; |
94fcca9f | 7039 | } |
1c4850e2 YZ |
7040 | |
7041 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
7042 | blocksize = btrfs_level_size(root, level - 1); | |
7043 | ||
7044 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
7045 | if (!next) { | |
7046 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
7047 | if (!next) |
7048 | return -ENOMEM; | |
1c4850e2 YZ |
7049 | reada = 1; |
7050 | } | |
7051 | btrfs_tree_lock(next); | |
7052 | btrfs_set_lock_blocking(next); | |
7053 | ||
3173a18f | 7054 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
7055 | &wc->refs[level - 1], |
7056 | &wc->flags[level - 1]); | |
79787eaa JM |
7057 | if (ret < 0) { |
7058 | btrfs_tree_unlock(next); | |
7059 | return ret; | |
7060 | } | |
7061 | ||
c2cf52eb SK |
7062 | if (unlikely(wc->refs[level - 1] == 0)) { |
7063 | btrfs_err(root->fs_info, "Missing references."); | |
7064 | BUG(); | |
7065 | } | |
94fcca9f | 7066 | *lookup_info = 0; |
1c4850e2 | 7067 | |
94fcca9f | 7068 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 7069 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
7070 | if (level == 1 && |
7071 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7072 | goto skip; | |
7073 | ||
1c4850e2 YZ |
7074 | if (!wc->update_ref || |
7075 | generation <= root->root_key.offset) | |
7076 | goto skip; | |
7077 | ||
7078 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
7079 | path->slots[level]); | |
7080 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
7081 | if (ret < 0) | |
7082 | goto skip; | |
7083 | ||
7084 | wc->stage = UPDATE_BACKREF; | |
7085 | wc->shared_level = level - 1; | |
7086 | } | |
94fcca9f YZ |
7087 | } else { |
7088 | if (level == 1 && | |
7089 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7090 | goto skip; | |
1c4850e2 YZ |
7091 | } |
7092 | ||
b9fab919 | 7093 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
7094 | btrfs_tree_unlock(next); |
7095 | free_extent_buffer(next); | |
7096 | next = NULL; | |
94fcca9f | 7097 | *lookup_info = 1; |
1c4850e2 YZ |
7098 | } |
7099 | ||
7100 | if (!next) { | |
7101 | if (reada && level == 1) | |
7102 | reada_walk_down(trans, root, wc, path); | |
7103 | next = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
7104 | if (!next || !extent_buffer_uptodate(next)) { |
7105 | free_extent_buffer(next); | |
97d9a8a4 | 7106 | return -EIO; |
416bc658 | 7107 | } |
1c4850e2 YZ |
7108 | btrfs_tree_lock(next); |
7109 | btrfs_set_lock_blocking(next); | |
7110 | } | |
7111 | ||
7112 | level--; | |
7113 | BUG_ON(level != btrfs_header_level(next)); | |
7114 | path->nodes[level] = next; | |
7115 | path->slots[level] = 0; | |
bd681513 | 7116 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
7117 | wc->level = level; |
7118 | if (wc->level == 1) | |
7119 | wc->reada_slot = 0; | |
7120 | return 0; | |
7121 | skip: | |
7122 | wc->refs[level - 1] = 0; | |
7123 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
7124 | if (wc->stage == DROP_REFERENCE) { |
7125 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
7126 | parent = path->nodes[level]->start; | |
7127 | } else { | |
7128 | BUG_ON(root->root_key.objectid != | |
7129 | btrfs_header_owner(path->nodes[level])); | |
7130 | parent = 0; | |
7131 | } | |
1c4850e2 | 7132 | |
94fcca9f | 7133 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 7134 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 7135 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 7136 | } |
1c4850e2 YZ |
7137 | btrfs_tree_unlock(next); |
7138 | free_extent_buffer(next); | |
94fcca9f | 7139 | *lookup_info = 1; |
1c4850e2 YZ |
7140 | return 1; |
7141 | } | |
7142 | ||
2c47e605 | 7143 | /* |
2c016dc2 | 7144 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
7145 | * |
7146 | * when wc->stage == DROP_REFERENCE, this function drops | |
7147 | * reference count on the block. | |
7148 | * | |
7149 | * when wc->stage == UPDATE_BACKREF, this function changes | |
7150 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
7151 | * to UPDATE_BACKREF previously while processing the block. | |
7152 | * | |
7153 | * NOTE: return value 1 means we should stop walking up. | |
7154 | */ | |
7155 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
7156 | struct btrfs_root *root, | |
7157 | struct btrfs_path *path, | |
7158 | struct walk_control *wc) | |
7159 | { | |
f0486c68 | 7160 | int ret; |
2c47e605 YZ |
7161 | int level = wc->level; |
7162 | struct extent_buffer *eb = path->nodes[level]; | |
7163 | u64 parent = 0; | |
7164 | ||
7165 | if (wc->stage == UPDATE_BACKREF) { | |
7166 | BUG_ON(wc->shared_level < level); | |
7167 | if (level < wc->shared_level) | |
7168 | goto out; | |
7169 | ||
2c47e605 YZ |
7170 | ret = find_next_key(path, level + 1, &wc->update_progress); |
7171 | if (ret > 0) | |
7172 | wc->update_ref = 0; | |
7173 | ||
7174 | wc->stage = DROP_REFERENCE; | |
7175 | wc->shared_level = -1; | |
7176 | path->slots[level] = 0; | |
7177 | ||
7178 | /* | |
7179 | * check reference count again if the block isn't locked. | |
7180 | * we should start walking down the tree again if reference | |
7181 | * count is one. | |
7182 | */ | |
7183 | if (!path->locks[level]) { | |
7184 | BUG_ON(level == 0); | |
7185 | btrfs_tree_lock(eb); | |
7186 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7187 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7188 | |
7189 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7190 | eb->start, level, 1, |
2c47e605 YZ |
7191 | &wc->refs[level], |
7192 | &wc->flags[level]); | |
79787eaa JM |
7193 | if (ret < 0) { |
7194 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7195 | path->locks[level] = 0; |
79787eaa JM |
7196 | return ret; |
7197 | } | |
2c47e605 YZ |
7198 | BUG_ON(wc->refs[level] == 0); |
7199 | if (wc->refs[level] == 1) { | |
bd681513 | 7200 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7201 | path->locks[level] = 0; |
2c47e605 YZ |
7202 | return 1; |
7203 | } | |
f82d02d9 | 7204 | } |
2c47e605 | 7205 | } |
f82d02d9 | 7206 | |
2c47e605 YZ |
7207 | /* wc->stage == DROP_REFERENCE */ |
7208 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7209 | |
2c47e605 YZ |
7210 | if (wc->refs[level] == 1) { |
7211 | if (level == 0) { | |
7212 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7213 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7214 | wc->for_reloc); | |
2c47e605 | 7215 | else |
66d7e7f0 AJ |
7216 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7217 | wc->for_reloc); | |
79787eaa | 7218 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7219 | } |
7220 | /* make block locked assertion in clean_tree_block happy */ | |
7221 | if (!path->locks[level] && | |
7222 | btrfs_header_generation(eb) == trans->transid) { | |
7223 | btrfs_tree_lock(eb); | |
7224 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7225 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7226 | } |
7227 | clean_tree_block(trans, root, eb); | |
7228 | } | |
7229 | ||
7230 | if (eb == root->node) { | |
7231 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7232 | parent = eb->start; | |
7233 | else | |
7234 | BUG_ON(root->root_key.objectid != | |
7235 | btrfs_header_owner(eb)); | |
7236 | } else { | |
7237 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7238 | parent = path->nodes[level + 1]->start; | |
7239 | else | |
7240 | BUG_ON(root->root_key.objectid != | |
7241 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7242 | } |
f82d02d9 | 7243 | |
5581a51a | 7244 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7245 | out: |
7246 | wc->refs[level] = 0; | |
7247 | wc->flags[level] = 0; | |
f0486c68 | 7248 | return 0; |
2c47e605 YZ |
7249 | } |
7250 | ||
7251 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7252 | struct btrfs_root *root, | |
7253 | struct btrfs_path *path, | |
7254 | struct walk_control *wc) | |
7255 | { | |
2c47e605 | 7256 | int level = wc->level; |
94fcca9f | 7257 | int lookup_info = 1; |
2c47e605 YZ |
7258 | int ret; |
7259 | ||
7260 | while (level >= 0) { | |
94fcca9f | 7261 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7262 | if (ret > 0) |
7263 | break; | |
7264 | ||
7265 | if (level == 0) | |
7266 | break; | |
7267 | ||
7a7965f8 YZ |
7268 | if (path->slots[level] >= |
7269 | btrfs_header_nritems(path->nodes[level])) | |
7270 | break; | |
7271 | ||
94fcca9f | 7272 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7273 | if (ret > 0) { |
7274 | path->slots[level]++; | |
7275 | continue; | |
90d2c51d MX |
7276 | } else if (ret < 0) |
7277 | return ret; | |
1c4850e2 | 7278 | level = wc->level; |
f82d02d9 | 7279 | } |
f82d02d9 YZ |
7280 | return 0; |
7281 | } | |
7282 | ||
d397712b | 7283 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7284 | struct btrfs_root *root, |
f82d02d9 | 7285 | struct btrfs_path *path, |
2c47e605 | 7286 | struct walk_control *wc, int max_level) |
20524f02 | 7287 | { |
2c47e605 | 7288 | int level = wc->level; |
20524f02 | 7289 | int ret; |
9f3a7427 | 7290 | |
2c47e605 YZ |
7291 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7292 | while (level < max_level && path->nodes[level]) { | |
7293 | wc->level = level; | |
7294 | if (path->slots[level] + 1 < | |
7295 | btrfs_header_nritems(path->nodes[level])) { | |
7296 | path->slots[level]++; | |
20524f02 CM |
7297 | return 0; |
7298 | } else { | |
2c47e605 YZ |
7299 | ret = walk_up_proc(trans, root, path, wc); |
7300 | if (ret > 0) | |
7301 | return 0; | |
bd56b302 | 7302 | |
2c47e605 | 7303 | if (path->locks[level]) { |
bd681513 CM |
7304 | btrfs_tree_unlock_rw(path->nodes[level], |
7305 | path->locks[level]); | |
2c47e605 | 7306 | path->locks[level] = 0; |
f82d02d9 | 7307 | } |
2c47e605 YZ |
7308 | free_extent_buffer(path->nodes[level]); |
7309 | path->nodes[level] = NULL; | |
7310 | level++; | |
20524f02 CM |
7311 | } |
7312 | } | |
7313 | return 1; | |
7314 | } | |
7315 | ||
9aca1d51 | 7316 | /* |
2c47e605 YZ |
7317 | * drop a subvolume tree. |
7318 | * | |
7319 | * this function traverses the tree freeing any blocks that only | |
7320 | * referenced by the tree. | |
7321 | * | |
7322 | * when a shared tree block is found. this function decreases its | |
7323 | * reference count by one. if update_ref is true, this function | |
7324 | * also make sure backrefs for the shared block and all lower level | |
7325 | * blocks are properly updated. | |
9d1a2a3a DS |
7326 | * |
7327 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 7328 | */ |
2c536799 | 7329 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7330 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7331 | int for_reloc) | |
20524f02 | 7332 | { |
5caf2a00 | 7333 | struct btrfs_path *path; |
2c47e605 YZ |
7334 | struct btrfs_trans_handle *trans; |
7335 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7336 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7337 | struct walk_control *wc; |
7338 | struct btrfs_key key; | |
7339 | int err = 0; | |
7340 | int ret; | |
7341 | int level; | |
20524f02 | 7342 | |
5caf2a00 | 7343 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7344 | if (!path) { |
7345 | err = -ENOMEM; | |
7346 | goto out; | |
7347 | } | |
20524f02 | 7348 | |
2c47e605 | 7349 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7350 | if (!wc) { |
7351 | btrfs_free_path(path); | |
cb1b69f4 TI |
7352 | err = -ENOMEM; |
7353 | goto out; | |
38a1a919 | 7354 | } |
2c47e605 | 7355 | |
a22285a6 | 7356 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7357 | if (IS_ERR(trans)) { |
7358 | err = PTR_ERR(trans); | |
7359 | goto out_free; | |
7360 | } | |
98d5dc13 | 7361 | |
3fd0a558 YZ |
7362 | if (block_rsv) |
7363 | trans->block_rsv = block_rsv; | |
2c47e605 | 7364 | |
9f3a7427 | 7365 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7366 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7367 | path->nodes[level] = btrfs_lock_root_node(root); |
7368 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7369 | path->slots[level] = 0; |
bd681513 | 7370 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7371 | memset(&wc->update_progress, 0, |
7372 | sizeof(wc->update_progress)); | |
9f3a7427 | 7373 | } else { |
9f3a7427 | 7374 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7375 | memcpy(&wc->update_progress, &key, |
7376 | sizeof(wc->update_progress)); | |
7377 | ||
6702ed49 | 7378 | level = root_item->drop_level; |
2c47e605 | 7379 | BUG_ON(level == 0); |
6702ed49 | 7380 | path->lowest_level = level; |
2c47e605 YZ |
7381 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7382 | path->lowest_level = 0; | |
7383 | if (ret < 0) { | |
7384 | err = ret; | |
79787eaa | 7385 | goto out_end_trans; |
9f3a7427 | 7386 | } |
1c4850e2 | 7387 | WARN_ON(ret > 0); |
2c47e605 | 7388 | |
7d9eb12c CM |
7389 | /* |
7390 | * unlock our path, this is safe because only this | |
7391 | * function is allowed to delete this snapshot | |
7392 | */ | |
5d4f98a2 | 7393 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7394 | |
7395 | level = btrfs_header_level(root->node); | |
7396 | while (1) { | |
7397 | btrfs_tree_lock(path->nodes[level]); | |
7398 | btrfs_set_lock_blocking(path->nodes[level]); | |
7399 | ||
7400 | ret = btrfs_lookup_extent_info(trans, root, | |
7401 | path->nodes[level]->start, | |
3173a18f | 7402 | level, 1, &wc->refs[level], |
2c47e605 | 7403 | &wc->flags[level]); |
79787eaa JM |
7404 | if (ret < 0) { |
7405 | err = ret; | |
7406 | goto out_end_trans; | |
7407 | } | |
2c47e605 YZ |
7408 | BUG_ON(wc->refs[level] == 0); |
7409 | ||
7410 | if (level == root_item->drop_level) | |
7411 | break; | |
7412 | ||
7413 | btrfs_tree_unlock(path->nodes[level]); | |
7414 | WARN_ON(wc->refs[level] != 1); | |
7415 | level--; | |
7416 | } | |
9f3a7427 | 7417 | } |
2c47e605 YZ |
7418 | |
7419 | wc->level = level; | |
7420 | wc->shared_level = -1; | |
7421 | wc->stage = DROP_REFERENCE; | |
7422 | wc->update_ref = update_ref; | |
7423 | wc->keep_locks = 0; | |
66d7e7f0 | 7424 | wc->for_reloc = for_reloc; |
1c4850e2 | 7425 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7426 | |
d397712b | 7427 | while (1) { |
9d1a2a3a DS |
7428 | if (!for_reloc && btrfs_fs_closing(root->fs_info)) { |
7429 | pr_debug("btrfs: drop snapshot early exit\n"); | |
7430 | err = -EAGAIN; | |
7431 | goto out_end_trans; | |
7432 | } | |
7433 | ||
2c47e605 YZ |
7434 | ret = walk_down_tree(trans, root, path, wc); |
7435 | if (ret < 0) { | |
7436 | err = ret; | |
20524f02 | 7437 | break; |
2c47e605 | 7438 | } |
9aca1d51 | 7439 | |
2c47e605 YZ |
7440 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7441 | if (ret < 0) { | |
7442 | err = ret; | |
20524f02 | 7443 | break; |
2c47e605 YZ |
7444 | } |
7445 | ||
7446 | if (ret > 0) { | |
7447 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7448 | break; |
7449 | } | |
2c47e605 YZ |
7450 | |
7451 | if (wc->stage == DROP_REFERENCE) { | |
7452 | level = wc->level; | |
7453 | btrfs_node_key(path->nodes[level], | |
7454 | &root_item->drop_progress, | |
7455 | path->slots[level]); | |
7456 | root_item->drop_level = level; | |
7457 | } | |
7458 | ||
7459 | BUG_ON(wc->level == 0); | |
3fd0a558 | 7460 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
7461 | ret = btrfs_update_root(trans, tree_root, |
7462 | &root->root_key, | |
7463 | root_item); | |
79787eaa JM |
7464 | if (ret) { |
7465 | btrfs_abort_transaction(trans, tree_root, ret); | |
7466 | err = ret; | |
7467 | goto out_end_trans; | |
7468 | } | |
2c47e605 | 7469 | |
3fd0a558 | 7470 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 7471 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7472 | if (IS_ERR(trans)) { |
7473 | err = PTR_ERR(trans); | |
7474 | goto out_free; | |
7475 | } | |
3fd0a558 YZ |
7476 | if (block_rsv) |
7477 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7478 | } |
20524f02 | 7479 | } |
b3b4aa74 | 7480 | btrfs_release_path(path); |
79787eaa JM |
7481 | if (err) |
7482 | goto out_end_trans; | |
2c47e605 YZ |
7483 | |
7484 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7485 | if (ret) { |
7486 | btrfs_abort_transaction(trans, tree_root, ret); | |
7487 | goto out_end_trans; | |
7488 | } | |
2c47e605 | 7489 | |
76dda93c YZ |
7490 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
7491 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
7492 | NULL, NULL); | |
79787eaa JM |
7493 | if (ret < 0) { |
7494 | btrfs_abort_transaction(trans, tree_root, ret); | |
7495 | err = ret; | |
7496 | goto out_end_trans; | |
7497 | } else if (ret > 0) { | |
84cd948c JB |
7498 | /* if we fail to delete the orphan item this time |
7499 | * around, it'll get picked up the next time. | |
7500 | * | |
7501 | * The most common failure here is just -ENOENT. | |
7502 | */ | |
7503 | btrfs_del_orphan_item(trans, tree_root, | |
7504 | root->root_key.objectid); | |
76dda93c YZ |
7505 | } |
7506 | } | |
7507 | ||
7508 | if (root->in_radix) { | |
7509 | btrfs_free_fs_root(tree_root->fs_info, root); | |
7510 | } else { | |
7511 | free_extent_buffer(root->node); | |
7512 | free_extent_buffer(root->commit_root); | |
7513 | kfree(root); | |
7514 | } | |
79787eaa | 7515 | out_end_trans: |
3fd0a558 | 7516 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7517 | out_free: |
2c47e605 | 7518 | kfree(wc); |
5caf2a00 | 7519 | btrfs_free_path(path); |
cb1b69f4 TI |
7520 | out: |
7521 | if (err) | |
7522 | btrfs_std_error(root->fs_info, err); | |
2c536799 | 7523 | return err; |
20524f02 | 7524 | } |
9078a3e1 | 7525 | |
2c47e605 YZ |
7526 | /* |
7527 | * drop subtree rooted at tree block 'node'. | |
7528 | * | |
7529 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7530 | * only used by relocation code |
2c47e605 | 7531 | */ |
f82d02d9 YZ |
7532 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7533 | struct btrfs_root *root, | |
7534 | struct extent_buffer *node, | |
7535 | struct extent_buffer *parent) | |
7536 | { | |
7537 | struct btrfs_path *path; | |
2c47e605 | 7538 | struct walk_control *wc; |
f82d02d9 YZ |
7539 | int level; |
7540 | int parent_level; | |
7541 | int ret = 0; | |
7542 | int wret; | |
7543 | ||
2c47e605 YZ |
7544 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7545 | ||
f82d02d9 | 7546 | path = btrfs_alloc_path(); |
db5b493a TI |
7547 | if (!path) |
7548 | return -ENOMEM; | |
f82d02d9 | 7549 | |
2c47e605 | 7550 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7551 | if (!wc) { |
7552 | btrfs_free_path(path); | |
7553 | return -ENOMEM; | |
7554 | } | |
2c47e605 | 7555 | |
b9447ef8 | 7556 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7557 | parent_level = btrfs_header_level(parent); |
7558 | extent_buffer_get(parent); | |
7559 | path->nodes[parent_level] = parent; | |
7560 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7561 | ||
b9447ef8 | 7562 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7563 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7564 | path->nodes[level] = node; |
7565 | path->slots[level] = 0; | |
bd681513 | 7566 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7567 | |
7568 | wc->refs[parent_level] = 1; | |
7569 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7570 | wc->level = level; | |
7571 | wc->shared_level = -1; | |
7572 | wc->stage = DROP_REFERENCE; | |
7573 | wc->update_ref = 0; | |
7574 | wc->keep_locks = 1; | |
66d7e7f0 | 7575 | wc->for_reloc = 1; |
1c4850e2 | 7576 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7577 | |
7578 | while (1) { | |
2c47e605 YZ |
7579 | wret = walk_down_tree(trans, root, path, wc); |
7580 | if (wret < 0) { | |
f82d02d9 | 7581 | ret = wret; |
f82d02d9 | 7582 | break; |
2c47e605 | 7583 | } |
f82d02d9 | 7584 | |
2c47e605 | 7585 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7586 | if (wret < 0) |
7587 | ret = wret; | |
7588 | if (wret != 0) | |
7589 | break; | |
7590 | } | |
7591 | ||
2c47e605 | 7592 | kfree(wc); |
f82d02d9 YZ |
7593 | btrfs_free_path(path); |
7594 | return ret; | |
7595 | } | |
7596 | ||
ec44a35c CM |
7597 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7598 | { | |
7599 | u64 num_devices; | |
fc67c450 | 7600 | u64 stripped; |
e4d8ec0f | 7601 | |
fc67c450 ID |
7602 | /* |
7603 | * if restripe for this chunk_type is on pick target profile and | |
7604 | * return, otherwise do the usual balance | |
7605 | */ | |
7606 | stripped = get_restripe_target(root->fs_info, flags); | |
7607 | if (stripped) | |
7608 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7609 | |
cd02dca5 CM |
7610 | /* |
7611 | * we add in the count of missing devices because we want | |
7612 | * to make sure that any RAID levels on a degraded FS | |
7613 | * continue to be honored. | |
7614 | */ | |
7615 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7616 | root->fs_info->fs_devices->missing_devices; | |
7617 | ||
fc67c450 | 7618 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7619 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7620 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7621 | ||
ec44a35c CM |
7622 | if (num_devices == 1) { |
7623 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7624 | stripped = flags & ~stripped; | |
7625 | ||
7626 | /* turn raid0 into single device chunks */ | |
7627 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7628 | return stripped; | |
7629 | ||
7630 | /* turn mirroring into duplication */ | |
7631 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7632 | BTRFS_BLOCK_GROUP_RAID10)) | |
7633 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7634 | } else { |
7635 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7636 | if (flags & stripped) |
7637 | return flags; | |
7638 | ||
7639 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7640 | stripped = flags & ~stripped; | |
7641 | ||
7642 | /* switch duplicated blocks with raid1 */ | |
7643 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7644 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7645 | ||
e3176ca2 | 7646 | /* this is drive concat, leave it alone */ |
ec44a35c | 7647 | } |
e3176ca2 | 7648 | |
ec44a35c CM |
7649 | return flags; |
7650 | } | |
7651 | ||
199c36ea | 7652 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7653 | { |
f0486c68 YZ |
7654 | struct btrfs_space_info *sinfo = cache->space_info; |
7655 | u64 num_bytes; | |
199c36ea | 7656 | u64 min_allocable_bytes; |
f0486c68 | 7657 | int ret = -ENOSPC; |
0ef3e66b | 7658 | |
c286ac48 | 7659 | |
199c36ea MX |
7660 | /* |
7661 | * We need some metadata space and system metadata space for | |
7662 | * allocating chunks in some corner cases until we force to set | |
7663 | * it to be readonly. | |
7664 | */ | |
7665 | if ((sinfo->flags & | |
7666 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7667 | !force) | |
7668 | min_allocable_bytes = 1 * 1024 * 1024; | |
7669 | else | |
7670 | min_allocable_bytes = 0; | |
7671 | ||
f0486c68 YZ |
7672 | spin_lock(&sinfo->lock); |
7673 | spin_lock(&cache->lock); | |
61cfea9b W |
7674 | |
7675 | if (cache->ro) { | |
7676 | ret = 0; | |
7677 | goto out; | |
7678 | } | |
7679 | ||
f0486c68 YZ |
7680 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7681 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7682 | ||
7683 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7684 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7685 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7686 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7687 | cache->ro = 1; |
7688 | ret = 0; | |
7689 | } | |
61cfea9b | 7690 | out: |
f0486c68 YZ |
7691 | spin_unlock(&cache->lock); |
7692 | spin_unlock(&sinfo->lock); | |
7693 | return ret; | |
7694 | } | |
7d9eb12c | 7695 | |
f0486c68 YZ |
7696 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7697 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7698 | |
f0486c68 YZ |
7699 | { |
7700 | struct btrfs_trans_handle *trans; | |
7701 | u64 alloc_flags; | |
7702 | int ret; | |
7d9eb12c | 7703 | |
f0486c68 | 7704 | BUG_ON(cache->ro); |
0ef3e66b | 7705 | |
ff5714cc | 7706 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7707 | if (IS_ERR(trans)) |
7708 | return PTR_ERR(trans); | |
5d4f98a2 | 7709 | |
f0486c68 | 7710 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7711 | if (alloc_flags != cache->flags) { |
698d0082 | 7712 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7713 | CHUNK_ALLOC_FORCE); |
7714 | if (ret < 0) | |
7715 | goto out; | |
7716 | } | |
5d4f98a2 | 7717 | |
199c36ea | 7718 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7719 | if (!ret) |
7720 | goto out; | |
7721 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7722 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7723 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7724 | if (ret < 0) |
7725 | goto out; | |
199c36ea | 7726 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7727 | out: |
7728 | btrfs_end_transaction(trans, root); | |
7729 | return ret; | |
7730 | } | |
5d4f98a2 | 7731 | |
c87f08ca CM |
7732 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7733 | struct btrfs_root *root, u64 type) | |
7734 | { | |
7735 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7736 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7737 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7738 | } |
7739 | ||
6d07bcec MX |
7740 | /* |
7741 | * helper to account the unused space of all the readonly block group in the | |
7742 | * list. takes mirrors into account. | |
7743 | */ | |
7744 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7745 | { | |
7746 | struct btrfs_block_group_cache *block_group; | |
7747 | u64 free_bytes = 0; | |
7748 | int factor; | |
7749 | ||
7750 | list_for_each_entry(block_group, groups_list, list) { | |
7751 | spin_lock(&block_group->lock); | |
7752 | ||
7753 | if (!block_group->ro) { | |
7754 | spin_unlock(&block_group->lock); | |
7755 | continue; | |
7756 | } | |
7757 | ||
7758 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7759 | BTRFS_BLOCK_GROUP_RAID10 | | |
7760 | BTRFS_BLOCK_GROUP_DUP)) | |
7761 | factor = 2; | |
7762 | else | |
7763 | factor = 1; | |
7764 | ||
7765 | free_bytes += (block_group->key.offset - | |
7766 | btrfs_block_group_used(&block_group->item)) * | |
7767 | factor; | |
7768 | ||
7769 | spin_unlock(&block_group->lock); | |
7770 | } | |
7771 | ||
7772 | return free_bytes; | |
7773 | } | |
7774 | ||
7775 | /* | |
7776 | * helper to account the unused space of all the readonly block group in the | |
7777 | * space_info. takes mirrors into account. | |
7778 | */ | |
7779 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
7780 | { | |
7781 | int i; | |
7782 | u64 free_bytes = 0; | |
7783 | ||
7784 | spin_lock(&sinfo->lock); | |
7785 | ||
7786 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
7787 | if (!list_empty(&sinfo->block_groups[i])) | |
7788 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
7789 | &sinfo->block_groups[i]); | |
7790 | ||
7791 | spin_unlock(&sinfo->lock); | |
7792 | ||
7793 | return free_bytes; | |
7794 | } | |
7795 | ||
143bede5 | 7796 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 7797 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 7798 | { |
f0486c68 YZ |
7799 | struct btrfs_space_info *sinfo = cache->space_info; |
7800 | u64 num_bytes; | |
7801 | ||
7802 | BUG_ON(!cache->ro); | |
7803 | ||
7804 | spin_lock(&sinfo->lock); | |
7805 | spin_lock(&cache->lock); | |
7806 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7807 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7808 | sinfo->bytes_readonly -= num_bytes; | |
7809 | cache->ro = 0; | |
7810 | spin_unlock(&cache->lock); | |
7811 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7812 | } |
7813 | ||
ba1bf481 JB |
7814 | /* |
7815 | * checks to see if its even possible to relocate this block group. | |
7816 | * | |
7817 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7818 | * ok to go ahead and try. | |
7819 | */ | |
7820 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7821 | { |
ba1bf481 JB |
7822 | struct btrfs_block_group_cache *block_group; |
7823 | struct btrfs_space_info *space_info; | |
7824 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7825 | struct btrfs_device *device; | |
cdcb725c | 7826 | u64 min_free; |
6719db6a JB |
7827 | u64 dev_min = 1; |
7828 | u64 dev_nr = 0; | |
4a5e98f5 | 7829 | u64 target; |
cdcb725c | 7830 | int index; |
ba1bf481 JB |
7831 | int full = 0; |
7832 | int ret = 0; | |
1a40e23b | 7833 | |
ba1bf481 | 7834 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7835 | |
ba1bf481 JB |
7836 | /* odd, couldn't find the block group, leave it alone */ |
7837 | if (!block_group) | |
7838 | return -1; | |
1a40e23b | 7839 | |
cdcb725c | 7840 | min_free = btrfs_block_group_used(&block_group->item); |
7841 | ||
ba1bf481 | 7842 | /* no bytes used, we're good */ |
cdcb725c | 7843 | if (!min_free) |
1a40e23b ZY |
7844 | goto out; |
7845 | ||
ba1bf481 JB |
7846 | space_info = block_group->space_info; |
7847 | spin_lock(&space_info->lock); | |
17d217fe | 7848 | |
ba1bf481 | 7849 | full = space_info->full; |
17d217fe | 7850 | |
ba1bf481 JB |
7851 | /* |
7852 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7853 | * relocate it unless we're able to allocate a new chunk below. |
7854 | * | |
7855 | * Otherwise, we need to make sure we have room in the space to handle | |
7856 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7857 | */ |
7ce618db | 7858 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 7859 | (space_info->bytes_used + space_info->bytes_reserved + |
7860 | space_info->bytes_pinned + space_info->bytes_readonly + | |
7861 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
7862 | spin_unlock(&space_info->lock); |
7863 | goto out; | |
17d217fe | 7864 | } |
ba1bf481 | 7865 | spin_unlock(&space_info->lock); |
ea8c2819 | 7866 | |
ba1bf481 JB |
7867 | /* |
7868 | * ok we don't have enough space, but maybe we have free space on our | |
7869 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
7870 | * alloc devices and guess if we have enough space. if this block |
7871 | * group is going to be restriped, run checks against the target | |
7872 | * profile instead of the current one. | |
ba1bf481 JB |
7873 | */ |
7874 | ret = -1; | |
ea8c2819 | 7875 | |
cdcb725c | 7876 | /* |
7877 | * index: | |
7878 | * 0: raid10 | |
7879 | * 1: raid1 | |
7880 | * 2: dup | |
7881 | * 3: raid0 | |
7882 | * 4: single | |
7883 | */ | |
4a5e98f5 ID |
7884 | target = get_restripe_target(root->fs_info, block_group->flags); |
7885 | if (target) { | |
31e50229 | 7886 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
7887 | } else { |
7888 | /* | |
7889 | * this is just a balance, so if we were marked as full | |
7890 | * we know there is no space for a new chunk | |
7891 | */ | |
7892 | if (full) | |
7893 | goto out; | |
7894 | ||
7895 | index = get_block_group_index(block_group); | |
7896 | } | |
7897 | ||
e6ec716f | 7898 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 7899 | dev_min = 4; |
6719db6a JB |
7900 | /* Divide by 2 */ |
7901 | min_free >>= 1; | |
e6ec716f | 7902 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 7903 | dev_min = 2; |
e6ec716f | 7904 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
7905 | /* Multiply by 2 */ |
7906 | min_free <<= 1; | |
e6ec716f | 7907 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 7908 | dev_min = fs_devices->rw_devices; |
6719db6a | 7909 | do_div(min_free, dev_min); |
cdcb725c | 7910 | } |
7911 | ||
ba1bf481 JB |
7912 | mutex_lock(&root->fs_info->chunk_mutex); |
7913 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 7914 | u64 dev_offset; |
56bec294 | 7915 | |
ba1bf481 JB |
7916 | /* |
7917 | * check to make sure we can actually find a chunk with enough | |
7918 | * space to fit our block group in. | |
7919 | */ | |
63a212ab SB |
7920 | if (device->total_bytes > device->bytes_used + min_free && |
7921 | !device->is_tgtdev_for_dev_replace) { | |
125ccb0a | 7922 | ret = find_free_dev_extent(device, min_free, |
7bfc837d | 7923 | &dev_offset, NULL); |
ba1bf481 | 7924 | if (!ret) |
cdcb725c | 7925 | dev_nr++; |
7926 | ||
7927 | if (dev_nr >= dev_min) | |
73e48b27 | 7928 | break; |
cdcb725c | 7929 | |
ba1bf481 | 7930 | ret = -1; |
725c8463 | 7931 | } |
edbd8d4e | 7932 | } |
ba1bf481 | 7933 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 7934 | out: |
ba1bf481 | 7935 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
7936 | return ret; |
7937 | } | |
7938 | ||
b2950863 CH |
7939 | static int find_first_block_group(struct btrfs_root *root, |
7940 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7941 | { |
925baedd | 7942 | int ret = 0; |
0b86a832 CM |
7943 | struct btrfs_key found_key; |
7944 | struct extent_buffer *leaf; | |
7945 | int slot; | |
edbd8d4e | 7946 | |
0b86a832 CM |
7947 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7948 | if (ret < 0) | |
925baedd CM |
7949 | goto out; |
7950 | ||
d397712b | 7951 | while (1) { |
0b86a832 | 7952 | slot = path->slots[0]; |
edbd8d4e | 7953 | leaf = path->nodes[0]; |
0b86a832 CM |
7954 | if (slot >= btrfs_header_nritems(leaf)) { |
7955 | ret = btrfs_next_leaf(root, path); | |
7956 | if (ret == 0) | |
7957 | continue; | |
7958 | if (ret < 0) | |
925baedd | 7959 | goto out; |
0b86a832 | 7960 | break; |
edbd8d4e | 7961 | } |
0b86a832 | 7962 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7963 | |
0b86a832 | 7964 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7965 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7966 | ret = 0; | |
7967 | goto out; | |
7968 | } | |
0b86a832 | 7969 | path->slots[0]++; |
edbd8d4e | 7970 | } |
925baedd | 7971 | out: |
0b86a832 | 7972 | return ret; |
edbd8d4e CM |
7973 | } |
7974 | ||
0af3d00b JB |
7975 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
7976 | { | |
7977 | struct btrfs_block_group_cache *block_group; | |
7978 | u64 last = 0; | |
7979 | ||
7980 | while (1) { | |
7981 | struct inode *inode; | |
7982 | ||
7983 | block_group = btrfs_lookup_first_block_group(info, last); | |
7984 | while (block_group) { | |
7985 | spin_lock(&block_group->lock); | |
7986 | if (block_group->iref) | |
7987 | break; | |
7988 | spin_unlock(&block_group->lock); | |
7989 | block_group = next_block_group(info->tree_root, | |
7990 | block_group); | |
7991 | } | |
7992 | if (!block_group) { | |
7993 | if (last == 0) | |
7994 | break; | |
7995 | last = 0; | |
7996 | continue; | |
7997 | } | |
7998 | ||
7999 | inode = block_group->inode; | |
8000 | block_group->iref = 0; | |
8001 | block_group->inode = NULL; | |
8002 | spin_unlock(&block_group->lock); | |
8003 | iput(inode); | |
8004 | last = block_group->key.objectid + block_group->key.offset; | |
8005 | btrfs_put_block_group(block_group); | |
8006 | } | |
8007 | } | |
8008 | ||
1a40e23b ZY |
8009 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8010 | { | |
8011 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8012 | struct btrfs_space_info *space_info; |
11833d66 | 8013 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8014 | struct rb_node *n; |
8015 | ||
11833d66 YZ |
8016 | down_write(&info->extent_commit_sem); |
8017 | while (!list_empty(&info->caching_block_groups)) { | |
8018 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8019 | struct btrfs_caching_control, list); | |
8020 | list_del(&caching_ctl->list); | |
8021 | put_caching_control(caching_ctl); | |
8022 | } | |
8023 | up_write(&info->extent_commit_sem); | |
8024 | ||
1a40e23b ZY |
8025 | spin_lock(&info->block_group_cache_lock); |
8026 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8027 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8028 | cache_node); | |
1a40e23b ZY |
8029 | rb_erase(&block_group->cache_node, |
8030 | &info->block_group_cache_tree); | |
d899e052 YZ |
8031 | spin_unlock(&info->block_group_cache_lock); |
8032 | ||
80eb234a | 8033 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8034 | list_del(&block_group->list); |
80eb234a | 8035 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8036 | |
817d52f8 | 8037 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8038 | wait_block_group_cache_done(block_group); |
817d52f8 | 8039 | |
3c14874a JB |
8040 | /* |
8041 | * We haven't cached this block group, which means we could | |
8042 | * possibly have excluded extents on this block group. | |
8043 | */ | |
8044 | if (block_group->cached == BTRFS_CACHE_NO) | |
8045 | free_excluded_extents(info->extent_root, block_group); | |
8046 | ||
817d52f8 | 8047 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 8048 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8049 | |
8050 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8051 | } |
8052 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8053 | |
8054 | /* now that all the block groups are freed, go through and | |
8055 | * free all the space_info structs. This is only called during | |
8056 | * the final stages of unmount, and so we know nobody is | |
8057 | * using them. We call synchronize_rcu() once before we start, | |
8058 | * just to be on the safe side. | |
8059 | */ | |
8060 | synchronize_rcu(); | |
8061 | ||
8929ecfa YZ |
8062 | release_global_block_rsv(info); |
8063 | ||
4184ea7f CM |
8064 | while(!list_empty(&info->space_info)) { |
8065 | space_info = list_entry(info->space_info.next, | |
8066 | struct btrfs_space_info, | |
8067 | list); | |
b069e0c3 DS |
8068 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
8069 | if (space_info->bytes_pinned > 0 || | |
8070 | space_info->bytes_reserved > 0 || | |
8071 | space_info->bytes_may_use > 0) { | |
8072 | WARN_ON(1); | |
8073 | dump_space_info(space_info, 0, 0); | |
8074 | } | |
f0486c68 | 8075 | } |
4184ea7f CM |
8076 | list_del(&space_info->list); |
8077 | kfree(space_info); | |
8078 | } | |
1a40e23b ZY |
8079 | return 0; |
8080 | } | |
8081 | ||
b742bb82 YZ |
8082 | static void __link_block_group(struct btrfs_space_info *space_info, |
8083 | struct btrfs_block_group_cache *cache) | |
8084 | { | |
8085 | int index = get_block_group_index(cache); | |
8086 | ||
8087 | down_write(&space_info->groups_sem); | |
8088 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8089 | up_write(&space_info->groups_sem); | |
8090 | } | |
8091 | ||
9078a3e1 CM |
8092 | int btrfs_read_block_groups(struct btrfs_root *root) |
8093 | { | |
8094 | struct btrfs_path *path; | |
8095 | int ret; | |
9078a3e1 | 8096 | struct btrfs_block_group_cache *cache; |
be744175 | 8097 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8098 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8099 | struct btrfs_key key; |
8100 | struct btrfs_key found_key; | |
5f39d397 | 8101 | struct extent_buffer *leaf; |
0af3d00b JB |
8102 | int need_clear = 0; |
8103 | u64 cache_gen; | |
96b5179d | 8104 | |
be744175 | 8105 | root = info->extent_root; |
9078a3e1 | 8106 | key.objectid = 0; |
0b86a832 | 8107 | key.offset = 0; |
9078a3e1 | 8108 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8109 | path = btrfs_alloc_path(); |
8110 | if (!path) | |
8111 | return -ENOMEM; | |
026fd317 | 8112 | path->reada = 1; |
9078a3e1 | 8113 | |
6c41761f | 8114 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 8115 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 8116 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 8117 | need_clear = 1; |
88c2ba3b JB |
8118 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8119 | need_clear = 1; | |
0af3d00b | 8120 | |
d397712b | 8121 | while (1) { |
0b86a832 | 8122 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8123 | if (ret > 0) |
8124 | break; | |
0b86a832 CM |
8125 | if (ret != 0) |
8126 | goto error; | |
5f39d397 CM |
8127 | leaf = path->nodes[0]; |
8128 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8129 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8130 | if (!cache) { |
0b86a832 | 8131 | ret = -ENOMEM; |
f0486c68 | 8132 | goto error; |
9078a3e1 | 8133 | } |
34d52cb6 LZ |
8134 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8135 | GFP_NOFS); | |
8136 | if (!cache->free_space_ctl) { | |
8137 | kfree(cache); | |
8138 | ret = -ENOMEM; | |
8139 | goto error; | |
8140 | } | |
3e1ad54f | 8141 | |
d2fb3437 | 8142 | atomic_set(&cache->count, 1); |
c286ac48 | 8143 | spin_lock_init(&cache->lock); |
817d52f8 | 8144 | cache->fs_info = info; |
0f9dd46c | 8145 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8146 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8147 | |
cf7c1ef6 LB |
8148 | if (need_clear) { |
8149 | /* | |
8150 | * When we mount with old space cache, we need to | |
8151 | * set BTRFS_DC_CLEAR and set dirty flag. | |
8152 | * | |
8153 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
8154 | * truncate the old free space cache inode and | |
8155 | * setup a new one. | |
8156 | * b) Setting 'dirty flag' makes sure that we flush | |
8157 | * the new space cache info onto disk. | |
8158 | */ | |
0af3d00b | 8159 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
8160 | if (btrfs_test_opt(root, SPACE_CACHE)) |
8161 | cache->dirty = 1; | |
8162 | } | |
0af3d00b | 8163 | |
5f39d397 CM |
8164 | read_extent_buffer(leaf, &cache->item, |
8165 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8166 | sizeof(cache->item)); | |
9078a3e1 | 8167 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8168 | |
9078a3e1 | 8169 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 8170 | btrfs_release_path(path); |
0b86a832 | 8171 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 | 8172 | cache->sectorsize = root->sectorsize; |
53b381b3 DW |
8173 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8174 | &root->fs_info->mapping_tree, | |
8175 | found_key.objectid); | |
34d52cb6 LZ |
8176 | btrfs_init_free_space_ctl(cache); |
8177 | ||
3c14874a JB |
8178 | /* |
8179 | * We need to exclude the super stripes now so that the space | |
8180 | * info has super bytes accounted for, otherwise we'll think | |
8181 | * we have more space than we actually do. | |
8182 | */ | |
835d974f JB |
8183 | ret = exclude_super_stripes(root, cache); |
8184 | if (ret) { | |
8185 | /* | |
8186 | * We may have excluded something, so call this just in | |
8187 | * case. | |
8188 | */ | |
8189 | free_excluded_extents(root, cache); | |
8190 | kfree(cache->free_space_ctl); | |
8191 | kfree(cache); | |
8192 | goto error; | |
8193 | } | |
3c14874a | 8194 | |
817d52f8 JB |
8195 | /* |
8196 | * check for two cases, either we are full, and therefore | |
8197 | * don't need to bother with the caching work since we won't | |
8198 | * find any space, or we are empty, and we can just add all | |
8199 | * the space in and be done with it. This saves us _alot_ of | |
8200 | * time, particularly in the full case. | |
8201 | */ | |
8202 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8203 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8204 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8205 | free_excluded_extents(root, cache); |
817d52f8 | 8206 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8207 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8208 | cache->cached = BTRFS_CACHE_FINISHED; |
8209 | add_new_free_space(cache, root->fs_info, | |
8210 | found_key.objectid, | |
8211 | found_key.objectid + | |
8212 | found_key.offset); | |
11833d66 | 8213 | free_excluded_extents(root, cache); |
817d52f8 | 8214 | } |
96b5179d | 8215 | |
8c579fe7 JB |
8216 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8217 | if (ret) { | |
8218 | btrfs_remove_free_space_cache(cache); | |
8219 | btrfs_put_block_group(cache); | |
8220 | goto error; | |
8221 | } | |
8222 | ||
6324fbf3 CM |
8223 | ret = update_space_info(info, cache->flags, found_key.offset, |
8224 | btrfs_block_group_used(&cache->item), | |
8225 | &space_info); | |
8c579fe7 JB |
8226 | if (ret) { |
8227 | btrfs_remove_free_space_cache(cache); | |
8228 | spin_lock(&info->block_group_cache_lock); | |
8229 | rb_erase(&cache->cache_node, | |
8230 | &info->block_group_cache_tree); | |
8231 | spin_unlock(&info->block_group_cache_lock); | |
8232 | btrfs_put_block_group(cache); | |
8233 | goto error; | |
8234 | } | |
8235 | ||
6324fbf3 | 8236 | cache->space_info = space_info; |
1b2da372 | 8237 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8238 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8239 | spin_unlock(&cache->space_info->lock); |
8240 | ||
b742bb82 | 8241 | __link_block_group(space_info, cache); |
0f9dd46c | 8242 | |
75ccf47d | 8243 | set_avail_alloc_bits(root->fs_info, cache->flags); |
2b82032c | 8244 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8245 | set_block_group_ro(cache, 1); |
9078a3e1 | 8246 | } |
b742bb82 YZ |
8247 | |
8248 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8249 | if (!(get_alloc_profile(root, space_info->flags) & | |
8250 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8251 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8252 | BTRFS_BLOCK_GROUP_RAID5 | |
8253 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8254 | BTRFS_BLOCK_GROUP_DUP))) |
8255 | continue; | |
8256 | /* | |
8257 | * avoid allocating from un-mirrored block group if there are | |
8258 | * mirrored block groups. | |
8259 | */ | |
8260 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 8261 | set_block_group_ro(cache, 1); |
b742bb82 | 8262 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 8263 | set_block_group_ro(cache, 1); |
9078a3e1 | 8264 | } |
f0486c68 YZ |
8265 | |
8266 | init_global_block_rsv(info); | |
0b86a832 CM |
8267 | ret = 0; |
8268 | error: | |
9078a3e1 | 8269 | btrfs_free_path(path); |
0b86a832 | 8270 | return ret; |
9078a3e1 | 8271 | } |
6324fbf3 | 8272 | |
ea658bad JB |
8273 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8274 | struct btrfs_root *root) | |
8275 | { | |
8276 | struct btrfs_block_group_cache *block_group, *tmp; | |
8277 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8278 | struct btrfs_block_group_item item; | |
8279 | struct btrfs_key key; | |
8280 | int ret = 0; | |
8281 | ||
8282 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8283 | new_bg_list) { | |
8284 | list_del_init(&block_group->new_bg_list); | |
8285 | ||
8286 | if (ret) | |
8287 | continue; | |
8288 | ||
8289 | spin_lock(&block_group->lock); | |
8290 | memcpy(&item, &block_group->item, sizeof(item)); | |
8291 | memcpy(&key, &block_group->key, sizeof(key)); | |
8292 | spin_unlock(&block_group->lock); | |
8293 | ||
8294 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8295 | sizeof(item)); | |
8296 | if (ret) | |
8297 | btrfs_abort_transaction(trans, extent_root, ret); | |
8298 | } | |
8299 | } | |
8300 | ||
6324fbf3 CM |
8301 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8302 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8303 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8304 | u64 size) |
8305 | { | |
8306 | int ret; | |
6324fbf3 CM |
8307 | struct btrfs_root *extent_root; |
8308 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8309 | |
8310 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8311 | |
12fcfd22 | 8312 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8313 | |
8f18cf13 | 8314 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8315 | if (!cache) |
8316 | return -ENOMEM; | |
34d52cb6 LZ |
8317 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8318 | GFP_NOFS); | |
8319 | if (!cache->free_space_ctl) { | |
8320 | kfree(cache); | |
8321 | return -ENOMEM; | |
8322 | } | |
0f9dd46c | 8323 | |
e17cade2 | 8324 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8325 | cache->key.offset = size; |
d2fb3437 | 8326 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8327 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8328 | cache->fs_info = root->fs_info; |
53b381b3 DW |
8329 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8330 | &root->fs_info->mapping_tree, | |
8331 | chunk_offset); | |
96303081 | 8332 | |
d2fb3437 | 8333 | atomic_set(&cache->count, 1); |
c286ac48 | 8334 | spin_lock_init(&cache->lock); |
0f9dd46c | 8335 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8336 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 8337 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 8338 | |
34d52cb6 LZ |
8339 | btrfs_init_free_space_ctl(cache); |
8340 | ||
6324fbf3 | 8341 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8342 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8343 | cache->flags = type; | |
8344 | btrfs_set_block_group_flags(&cache->item, type); | |
8345 | ||
11833d66 | 8346 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8347 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8348 | ret = exclude_super_stripes(root, cache); |
8349 | if (ret) { | |
8350 | /* | |
8351 | * We may have excluded something, so call this just in | |
8352 | * case. | |
8353 | */ | |
8354 | free_excluded_extents(root, cache); | |
8355 | kfree(cache->free_space_ctl); | |
8356 | kfree(cache); | |
8357 | return ret; | |
8358 | } | |
96303081 | 8359 | |
817d52f8 JB |
8360 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8361 | chunk_offset + size); | |
8362 | ||
11833d66 YZ |
8363 | free_excluded_extents(root, cache); |
8364 | ||
8c579fe7 JB |
8365 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8366 | if (ret) { | |
8367 | btrfs_remove_free_space_cache(cache); | |
8368 | btrfs_put_block_group(cache); | |
8369 | return ret; | |
8370 | } | |
8371 | ||
6324fbf3 CM |
8372 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8373 | &cache->space_info); | |
8c579fe7 JB |
8374 | if (ret) { |
8375 | btrfs_remove_free_space_cache(cache); | |
8376 | spin_lock(&root->fs_info->block_group_cache_lock); | |
8377 | rb_erase(&cache->cache_node, | |
8378 | &root->fs_info->block_group_cache_tree); | |
8379 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
8380 | btrfs_put_block_group(cache); | |
8381 | return ret; | |
8382 | } | |
c7c144db | 8383 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8384 | |
8385 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8386 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8387 | spin_unlock(&cache->space_info->lock); |
8388 | ||
b742bb82 | 8389 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8390 | |
ea658bad | 8391 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8392 | |
d18a2c44 | 8393 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8394 | |
6324fbf3 CM |
8395 | return 0; |
8396 | } | |
1a40e23b | 8397 | |
10ea00f5 ID |
8398 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8399 | { | |
899c81ea ID |
8400 | u64 extra_flags = chunk_to_extended(flags) & |
8401 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8402 | |
de98ced9 | 8403 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8404 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8405 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8406 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8407 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8408 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8409 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8410 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8411 | } |
8412 | ||
1a40e23b ZY |
8413 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8414 | struct btrfs_root *root, u64 group_start) | |
8415 | { | |
8416 | struct btrfs_path *path; | |
8417 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8418 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8419 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8420 | struct btrfs_key key; |
0af3d00b | 8421 | struct inode *inode; |
1a40e23b | 8422 | int ret; |
10ea00f5 | 8423 | int index; |
89a55897 | 8424 | int factor; |
1a40e23b | 8425 | |
1a40e23b ZY |
8426 | root = root->fs_info->extent_root; |
8427 | ||
8428 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8429 | BUG_ON(!block_group); | |
c146afad | 8430 | BUG_ON(!block_group->ro); |
1a40e23b | 8431 | |
9f7c43c9 | 8432 | /* |
8433 | * Free the reserved super bytes from this block group before | |
8434 | * remove it. | |
8435 | */ | |
8436 | free_excluded_extents(root, block_group); | |
8437 | ||
1a40e23b | 8438 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8439 | index = get_block_group_index(block_group); |
89a55897 JB |
8440 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8441 | BTRFS_BLOCK_GROUP_RAID1 | | |
8442 | BTRFS_BLOCK_GROUP_RAID10)) | |
8443 | factor = 2; | |
8444 | else | |
8445 | factor = 1; | |
1a40e23b | 8446 | |
44fb5511 CM |
8447 | /* make sure this block group isn't part of an allocation cluster */ |
8448 | cluster = &root->fs_info->data_alloc_cluster; | |
8449 | spin_lock(&cluster->refill_lock); | |
8450 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8451 | spin_unlock(&cluster->refill_lock); | |
8452 | ||
8453 | /* | |
8454 | * make sure this block group isn't part of a metadata | |
8455 | * allocation cluster | |
8456 | */ | |
8457 | cluster = &root->fs_info->meta_alloc_cluster; | |
8458 | spin_lock(&cluster->refill_lock); | |
8459 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8460 | spin_unlock(&cluster->refill_lock); | |
8461 | ||
1a40e23b | 8462 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8463 | if (!path) { |
8464 | ret = -ENOMEM; | |
8465 | goto out; | |
8466 | } | |
1a40e23b | 8467 | |
10b2f34d | 8468 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8469 | if (!IS_ERR(inode)) { |
b532402e | 8470 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8471 | if (ret) { |
8472 | btrfs_add_delayed_iput(inode); | |
8473 | goto out; | |
8474 | } | |
0af3d00b JB |
8475 | clear_nlink(inode); |
8476 | /* One for the block groups ref */ | |
8477 | spin_lock(&block_group->lock); | |
8478 | if (block_group->iref) { | |
8479 | block_group->iref = 0; | |
8480 | block_group->inode = NULL; | |
8481 | spin_unlock(&block_group->lock); | |
8482 | iput(inode); | |
8483 | } else { | |
8484 | spin_unlock(&block_group->lock); | |
8485 | } | |
8486 | /* One for our lookup ref */ | |
455757c3 | 8487 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8488 | } |
8489 | ||
8490 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8491 | key.offset = block_group->key.objectid; | |
8492 | key.type = 0; | |
8493 | ||
8494 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8495 | if (ret < 0) | |
8496 | goto out; | |
8497 | if (ret > 0) | |
b3b4aa74 | 8498 | btrfs_release_path(path); |
0af3d00b JB |
8499 | if (ret == 0) { |
8500 | ret = btrfs_del_item(trans, tree_root, path); | |
8501 | if (ret) | |
8502 | goto out; | |
b3b4aa74 | 8503 | btrfs_release_path(path); |
0af3d00b JB |
8504 | } |
8505 | ||
3dfdb934 | 8506 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8507 | rb_erase(&block_group->cache_node, |
8508 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8509 | |
8510 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8511 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8512 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8513 | |
80eb234a | 8514 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8515 | /* |
8516 | * we must use list_del_init so people can check to see if they | |
8517 | * are still on the list after taking the semaphore | |
8518 | */ | |
8519 | list_del_init(&block_group->list); | |
10ea00f5 ID |
8520 | if (list_empty(&block_group->space_info->block_groups[index])) |
8521 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
80eb234a | 8522 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8523 | |
817d52f8 | 8524 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8525 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8526 | |
8527 | btrfs_remove_free_space_cache(block_group); | |
8528 | ||
c146afad YZ |
8529 | spin_lock(&block_group->space_info->lock); |
8530 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8531 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8532 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8533 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8534 | |
0af3d00b JB |
8535 | memcpy(&key, &block_group->key, sizeof(key)); |
8536 | ||
283bb197 | 8537 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8538 | |
fa9c0d79 CM |
8539 | btrfs_put_block_group(block_group); |
8540 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8541 | |
8542 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8543 | if (ret > 0) | |
8544 | ret = -EIO; | |
8545 | if (ret < 0) | |
8546 | goto out; | |
8547 | ||
8548 | ret = btrfs_del_item(trans, root, path); | |
8549 | out: | |
8550 | btrfs_free_path(path); | |
8551 | return ret; | |
8552 | } | |
acce952b | 8553 | |
c59021f8 | 8554 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8555 | { | |
8556 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8557 | struct btrfs_super_block *disk_super; |
8558 | u64 features; | |
8559 | u64 flags; | |
8560 | int mixed = 0; | |
c59021f8 | 8561 | int ret; |
8562 | ||
6c41761f | 8563 | disk_super = fs_info->super_copy; |
1aba86d6 | 8564 | if (!btrfs_super_root(disk_super)) |
8565 | return 1; | |
c59021f8 | 8566 | |
1aba86d6 | 8567 | features = btrfs_super_incompat_flags(disk_super); |
8568 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8569 | mixed = 1; | |
c59021f8 | 8570 | |
1aba86d6 | 8571 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8572 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8573 | if (ret) |
1aba86d6 | 8574 | goto out; |
c59021f8 | 8575 | |
1aba86d6 | 8576 | if (mixed) { |
8577 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8578 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8579 | } else { | |
8580 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8581 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8582 | if (ret) | |
8583 | goto out; | |
8584 | ||
8585 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8586 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8587 | } | |
8588 | out: | |
c59021f8 | 8589 | return ret; |
8590 | } | |
8591 | ||
acce952b | 8592 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8593 | { | |
8594 | return unpin_extent_range(root, start, end); | |
8595 | } | |
8596 | ||
8597 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8598 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8599 | { |
5378e607 | 8600 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8601 | } |
f7039b1d LD |
8602 | |
8603 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8604 | { | |
8605 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8606 | struct btrfs_block_group_cache *cache = NULL; | |
8607 | u64 group_trimmed; | |
8608 | u64 start; | |
8609 | u64 end; | |
8610 | u64 trimmed = 0; | |
2cac13e4 | 8611 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8612 | int ret = 0; |
8613 | ||
2cac13e4 LB |
8614 | /* |
8615 | * try to trim all FS space, our block group may start from non-zero. | |
8616 | */ | |
8617 | if (range->len == total_bytes) | |
8618 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8619 | else | |
8620 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8621 | |
8622 | while (cache) { | |
8623 | if (cache->key.objectid >= (range->start + range->len)) { | |
8624 | btrfs_put_block_group(cache); | |
8625 | break; | |
8626 | } | |
8627 | ||
8628 | start = max(range->start, cache->key.objectid); | |
8629 | end = min(range->start + range->len, | |
8630 | cache->key.objectid + cache->key.offset); | |
8631 | ||
8632 | if (end - start >= range->minlen) { | |
8633 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8634 | ret = cache_block_group(cache, 0); |
f7039b1d LD |
8635 | if (!ret) |
8636 | wait_block_group_cache_done(cache); | |
8637 | } | |
8638 | ret = btrfs_trim_block_group(cache, | |
8639 | &group_trimmed, | |
8640 | start, | |
8641 | end, | |
8642 | range->minlen); | |
8643 | ||
8644 | trimmed += group_trimmed; | |
8645 | if (ret) { | |
8646 | btrfs_put_block_group(cache); | |
8647 | break; | |
8648 | } | |
8649 | } | |
8650 | ||
8651 | cache = next_block_group(fs_info->tree_root, cache); | |
8652 | } | |
8653 | ||
8654 | range->len = trimmed; | |
8655 | return ret; | |
8656 | } |