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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
b150a4f1 | 27 | #include <linux/percpu_counter.h> |
74493f7a | 28 | #include "hash.h" |
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" |
6ab0a202 | 38 | #include "sysfs.h" |
fec577fb | 39 | |
709c0486 AJ |
40 | #undef SCRAMBLE_DELAYED_REFS |
41 | ||
9e622d6b MX |
42 | /* |
43 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
45 | * if we really need one. | |
46 | * | |
0e4f8f88 CM |
47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
48 | * if we have very few chunks already allocated. This is | |
49 | * used as part of the clustering code to help make sure | |
50 | * we have a good pool of storage to cluster in, without | |
51 | * filling the FS with empty chunks | |
52 | * | |
9e622d6b MX |
53 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
54 | * | |
0e4f8f88 CM |
55 | */ |
56 | enum { | |
57 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
58 | CHUNK_ALLOC_LIMITED = 1, |
59 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
60 | }; |
61 | ||
fb25e914 JB |
62 | /* |
63 | * Control how reservations are dealt with. | |
64 | * | |
65 | * RESERVE_FREE - freeing a reservation. | |
66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
67 | * ENOSPC accounting | |
68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
69 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
70 | */ | |
71 | enum { | |
72 | RESERVE_FREE = 0, | |
73 | RESERVE_ALLOC = 1, | |
74 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
75 | }; | |
76 | ||
c53d613e | 77 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 78 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
79 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
80 | struct btrfs_root *root, | |
81 | u64 bytenr, u64 num_bytes, u64 parent, | |
82 | u64 root_objectid, u64 owner_objectid, | |
83 | u64 owner_offset, int refs_to_drop, | |
84 | struct btrfs_delayed_extent_op *extra_op); | |
85 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
86 | struct extent_buffer *leaf, | |
87 | struct btrfs_extent_item *ei); | |
88 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
89 | struct btrfs_root *root, | |
90 | u64 parent, u64 root_objectid, | |
91 | u64 flags, u64 owner, u64 offset, | |
92 | struct btrfs_key *ins, int ref_mod); | |
93 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
94 | struct btrfs_root *root, | |
95 | u64 parent, u64 root_objectid, | |
96 | u64 flags, struct btrfs_disk_key *key, | |
97 | int level, struct btrfs_key *ins); | |
6a63209f | 98 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
99 | struct btrfs_root *extent_root, u64 flags, |
100 | int force); | |
11833d66 YZ |
101 | static int find_next_key(struct btrfs_path *path, int level, |
102 | struct btrfs_key *key); | |
9ed74f2d JB |
103 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
104 | int dump_block_groups); | |
fb25e914 JB |
105 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
106 | u64 num_bytes, int reserve); | |
5d80366e JB |
107 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
108 | u64 num_bytes); | |
48a3b636 ES |
109 | int btrfs_pin_extent(struct btrfs_root *root, |
110 | u64 bytenr, u64 num_bytes, int reserved); | |
6a63209f | 111 | |
817d52f8 JB |
112 | static noinline int |
113 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
114 | { | |
115 | smp_mb(); | |
36cce922 JB |
116 | return cache->cached == BTRFS_CACHE_FINISHED || |
117 | cache->cached == BTRFS_CACHE_ERROR; | |
817d52f8 JB |
118 | } |
119 | ||
0f9dd46c JB |
120 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
121 | { | |
122 | return (cache->flags & bits) == bits; | |
123 | } | |
124 | ||
62a45b60 | 125 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
126 | { |
127 | atomic_inc(&cache->count); | |
128 | } | |
129 | ||
130 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
131 | { | |
f0486c68 YZ |
132 | if (atomic_dec_and_test(&cache->count)) { |
133 | WARN_ON(cache->pinned > 0); | |
134 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 135 | kfree(cache->free_space_ctl); |
11dfe35a | 136 | kfree(cache); |
f0486c68 | 137 | } |
11dfe35a JB |
138 | } |
139 | ||
0f9dd46c JB |
140 | /* |
141 | * this adds the block group to the fs_info rb tree for the block group | |
142 | * cache | |
143 | */ | |
b2950863 | 144 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
145 | struct btrfs_block_group_cache *block_group) |
146 | { | |
147 | struct rb_node **p; | |
148 | struct rb_node *parent = NULL; | |
149 | struct btrfs_block_group_cache *cache; | |
150 | ||
151 | spin_lock(&info->block_group_cache_lock); | |
152 | p = &info->block_group_cache_tree.rb_node; | |
153 | ||
154 | while (*p) { | |
155 | parent = *p; | |
156 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
157 | cache_node); | |
158 | if (block_group->key.objectid < cache->key.objectid) { | |
159 | p = &(*p)->rb_left; | |
160 | } else if (block_group->key.objectid > cache->key.objectid) { | |
161 | p = &(*p)->rb_right; | |
162 | } else { | |
163 | spin_unlock(&info->block_group_cache_lock); | |
164 | return -EEXIST; | |
165 | } | |
166 | } | |
167 | ||
168 | rb_link_node(&block_group->cache_node, parent, p); | |
169 | rb_insert_color(&block_group->cache_node, | |
170 | &info->block_group_cache_tree); | |
a1897fdd LB |
171 | |
172 | if (info->first_logical_byte > block_group->key.objectid) | |
173 | info->first_logical_byte = block_group->key.objectid; | |
174 | ||
0f9dd46c JB |
175 | spin_unlock(&info->block_group_cache_lock); |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * This will return the block group at or after bytenr if contains is 0, else | |
182 | * it will return the block group that contains the bytenr | |
183 | */ | |
184 | static struct btrfs_block_group_cache * | |
185 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
186 | int contains) | |
187 | { | |
188 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
189 | struct rb_node *n; | |
190 | u64 end, start; | |
191 | ||
192 | spin_lock(&info->block_group_cache_lock); | |
193 | n = info->block_group_cache_tree.rb_node; | |
194 | ||
195 | while (n) { | |
196 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
197 | cache_node); | |
198 | end = cache->key.objectid + cache->key.offset - 1; | |
199 | start = cache->key.objectid; | |
200 | ||
201 | if (bytenr < start) { | |
202 | if (!contains && (!ret || start < ret->key.objectid)) | |
203 | ret = cache; | |
204 | n = n->rb_left; | |
205 | } else if (bytenr > start) { | |
206 | if (contains && bytenr <= end) { | |
207 | ret = cache; | |
208 | break; | |
209 | } | |
210 | n = n->rb_right; | |
211 | } else { | |
212 | ret = cache; | |
213 | break; | |
214 | } | |
215 | } | |
a1897fdd | 216 | if (ret) { |
11dfe35a | 217 | btrfs_get_block_group(ret); |
a1897fdd LB |
218 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
219 | info->first_logical_byte = ret->key.objectid; | |
220 | } | |
0f9dd46c JB |
221 | spin_unlock(&info->block_group_cache_lock); |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
11833d66 YZ |
226 | static int add_excluded_extent(struct btrfs_root *root, |
227 | u64 start, u64 num_bytes) | |
817d52f8 | 228 | { |
11833d66 YZ |
229 | u64 end = start + num_bytes - 1; |
230 | set_extent_bits(&root->fs_info->freed_extents[0], | |
231 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
232 | set_extent_bits(&root->fs_info->freed_extents[1], | |
233 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
234 | return 0; | |
235 | } | |
817d52f8 | 236 | |
11833d66 YZ |
237 | static void free_excluded_extents(struct btrfs_root *root, |
238 | struct btrfs_block_group_cache *cache) | |
239 | { | |
240 | u64 start, end; | |
817d52f8 | 241 | |
11833d66 YZ |
242 | start = cache->key.objectid; |
243 | end = start + cache->key.offset - 1; | |
244 | ||
245 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
246 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
247 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
248 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
249 | } |
250 | ||
11833d66 YZ |
251 | static int exclude_super_stripes(struct btrfs_root *root, |
252 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 253 | { |
817d52f8 JB |
254 | u64 bytenr; |
255 | u64 *logical; | |
256 | int stripe_len; | |
257 | int i, nr, ret; | |
258 | ||
06b2331f YZ |
259 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
260 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
261 | cache->bytes_super += stripe_len; | |
262 | ret = add_excluded_extent(root, cache->key.objectid, | |
263 | stripe_len); | |
835d974f JB |
264 | if (ret) |
265 | return ret; | |
06b2331f YZ |
266 | } |
267 | ||
817d52f8 JB |
268 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
269 | bytenr = btrfs_sb_offset(i); | |
270 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
271 | cache->key.objectid, bytenr, | |
272 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
273 | if (ret) |
274 | return ret; | |
11833d66 | 275 | |
817d52f8 | 276 | while (nr--) { |
51bf5f0b JB |
277 | u64 start, len; |
278 | ||
279 | if (logical[nr] > cache->key.objectid + | |
280 | cache->key.offset) | |
281 | continue; | |
282 | ||
283 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
284 | continue; | |
285 | ||
286 | start = logical[nr]; | |
287 | if (start < cache->key.objectid) { | |
288 | start = cache->key.objectid; | |
289 | len = (logical[nr] + stripe_len) - start; | |
290 | } else { | |
291 | len = min_t(u64, stripe_len, | |
292 | cache->key.objectid + | |
293 | cache->key.offset - start); | |
294 | } | |
295 | ||
296 | cache->bytes_super += len; | |
297 | ret = add_excluded_extent(root, start, len); | |
835d974f JB |
298 | if (ret) { |
299 | kfree(logical); | |
300 | return ret; | |
301 | } | |
817d52f8 | 302 | } |
11833d66 | 303 | |
817d52f8 JB |
304 | kfree(logical); |
305 | } | |
817d52f8 JB |
306 | return 0; |
307 | } | |
308 | ||
11833d66 YZ |
309 | static struct btrfs_caching_control * |
310 | get_caching_control(struct btrfs_block_group_cache *cache) | |
311 | { | |
312 | struct btrfs_caching_control *ctl; | |
313 | ||
314 | spin_lock(&cache->lock); | |
315 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
316 | spin_unlock(&cache->lock); | |
317 | return NULL; | |
318 | } | |
319 | ||
dde5abee JB |
320 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
321 | if (!cache->caching_ctl) { | |
322 | spin_unlock(&cache->lock); | |
11833d66 YZ |
323 | return NULL; |
324 | } | |
325 | ||
326 | ctl = cache->caching_ctl; | |
327 | atomic_inc(&ctl->count); | |
328 | spin_unlock(&cache->lock); | |
329 | return ctl; | |
330 | } | |
331 | ||
332 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
333 | { | |
334 | if (atomic_dec_and_test(&ctl->count)) | |
335 | kfree(ctl); | |
336 | } | |
337 | ||
0f9dd46c JB |
338 | /* |
339 | * this is only called by cache_block_group, since we could have freed extents | |
340 | * we need to check the pinned_extents for any extents that can't be used yet | |
341 | * since their free space will be released as soon as the transaction commits. | |
342 | */ | |
817d52f8 | 343 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
344 | struct btrfs_fs_info *info, u64 start, u64 end) |
345 | { | |
817d52f8 | 346 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
347 | int ret; |
348 | ||
349 | while (start < end) { | |
11833d66 | 350 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 351 | &extent_start, &extent_end, |
e6138876 JB |
352 | EXTENT_DIRTY | EXTENT_UPTODATE, |
353 | NULL); | |
0f9dd46c JB |
354 | if (ret) |
355 | break; | |
356 | ||
06b2331f | 357 | if (extent_start <= start) { |
0f9dd46c JB |
358 | start = extent_end + 1; |
359 | } else if (extent_start > start && extent_start < end) { | |
360 | size = extent_start - start; | |
817d52f8 | 361 | total_added += size; |
ea6a478e JB |
362 | ret = btrfs_add_free_space(block_group, start, |
363 | size); | |
79787eaa | 364 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
365 | start = extent_end + 1; |
366 | } else { | |
367 | break; | |
368 | } | |
369 | } | |
370 | ||
371 | if (start < end) { | |
372 | size = end - start; | |
817d52f8 | 373 | total_added += size; |
ea6a478e | 374 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 375 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
376 | } |
377 | ||
817d52f8 | 378 | return total_added; |
0f9dd46c JB |
379 | } |
380 | ||
bab39bf9 | 381 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 382 | { |
bab39bf9 JB |
383 | struct btrfs_block_group_cache *block_group; |
384 | struct btrfs_fs_info *fs_info; | |
385 | struct btrfs_caching_control *caching_ctl; | |
386 | struct btrfs_root *extent_root; | |
e37c9e69 | 387 | struct btrfs_path *path; |
5f39d397 | 388 | struct extent_buffer *leaf; |
11833d66 | 389 | struct btrfs_key key; |
817d52f8 | 390 | u64 total_found = 0; |
11833d66 YZ |
391 | u64 last = 0; |
392 | u32 nritems; | |
36cce922 | 393 | int ret = -ENOMEM; |
f510cfec | 394 | |
bab39bf9 JB |
395 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
396 | block_group = caching_ctl->block_group; | |
397 | fs_info = block_group->fs_info; | |
398 | extent_root = fs_info->extent_root; | |
399 | ||
e37c9e69 CM |
400 | path = btrfs_alloc_path(); |
401 | if (!path) | |
bab39bf9 | 402 | goto out; |
7d7d6068 | 403 | |
817d52f8 | 404 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 405 | |
5cd57b2c | 406 | /* |
817d52f8 JB |
407 | * We don't want to deadlock with somebody trying to allocate a new |
408 | * extent for the extent root while also trying to search the extent | |
409 | * root to add free space. So we skip locking and search the commit | |
410 | * root, since its read-only | |
5cd57b2c CM |
411 | */ |
412 | path->skip_locking = 1; | |
817d52f8 | 413 | path->search_commit_root = 1; |
026fd317 | 414 | path->reada = 1; |
817d52f8 | 415 | |
e4404d6e | 416 | key.objectid = last; |
e37c9e69 | 417 | key.offset = 0; |
11833d66 | 418 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 419 | again: |
11833d66 | 420 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
421 | /* need to make sure the commit_root doesn't disappear */ |
422 | down_read(&fs_info->extent_commit_sem); | |
423 | ||
52ee28d2 | 424 | next: |
11833d66 | 425 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 426 | if (ret < 0) |
ef8bbdfe | 427 | goto err; |
a512bbf8 | 428 | |
11833d66 YZ |
429 | leaf = path->nodes[0]; |
430 | nritems = btrfs_header_nritems(leaf); | |
431 | ||
d397712b | 432 | while (1) { |
7841cb28 | 433 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 434 | last = (u64)-1; |
817d52f8 | 435 | break; |
f25784b3 | 436 | } |
817d52f8 | 437 | |
11833d66 YZ |
438 | if (path->slots[0] < nritems) { |
439 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
440 | } else { | |
441 | ret = find_next_key(path, 0, &key); | |
442 | if (ret) | |
e37c9e69 | 443 | break; |
817d52f8 | 444 | |
c9ea7b24 JB |
445 | if (need_resched() || |
446 | rwsem_is_contended(&fs_info->extent_commit_sem)) { | |
589d8ade | 447 | caching_ctl->progress = last; |
ff5714cc | 448 | btrfs_release_path(path); |
589d8ade JB |
449 | up_read(&fs_info->extent_commit_sem); |
450 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 451 | cond_resched(); |
589d8ade JB |
452 | goto again; |
453 | } | |
0a3896d0 JB |
454 | |
455 | ret = btrfs_next_leaf(extent_root, path); | |
456 | if (ret < 0) | |
457 | goto err; | |
458 | if (ret) | |
459 | break; | |
589d8ade JB |
460 | leaf = path->nodes[0]; |
461 | nritems = btrfs_header_nritems(leaf); | |
462 | continue; | |
11833d66 | 463 | } |
817d52f8 | 464 | |
52ee28d2 LB |
465 | if (key.objectid < last) { |
466 | key.objectid = last; | |
467 | key.offset = 0; | |
468 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
469 | ||
470 | caching_ctl->progress = last; | |
471 | btrfs_release_path(path); | |
472 | goto next; | |
473 | } | |
474 | ||
11833d66 YZ |
475 | if (key.objectid < block_group->key.objectid) { |
476 | path->slots[0]++; | |
817d52f8 | 477 | continue; |
e37c9e69 | 478 | } |
0f9dd46c | 479 | |
e37c9e69 | 480 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 481 | block_group->key.offset) |
e37c9e69 | 482 | break; |
7d7d6068 | 483 | |
3173a18f JB |
484 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
485 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
486 | total_found += add_new_free_space(block_group, |
487 | fs_info, last, | |
488 | key.objectid); | |
3173a18f JB |
489 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
490 | last = key.objectid + | |
491 | fs_info->tree_root->leafsize; | |
492 | else | |
493 | last = key.objectid + key.offset; | |
817d52f8 | 494 | |
11833d66 YZ |
495 | if (total_found > (1024 * 1024 * 2)) { |
496 | total_found = 0; | |
497 | wake_up(&caching_ctl->wait); | |
498 | } | |
817d52f8 | 499 | } |
e37c9e69 CM |
500 | path->slots[0]++; |
501 | } | |
817d52f8 | 502 | ret = 0; |
e37c9e69 | 503 | |
817d52f8 JB |
504 | total_found += add_new_free_space(block_group, fs_info, last, |
505 | block_group->key.objectid + | |
506 | block_group->key.offset); | |
11833d66 | 507 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
508 | |
509 | spin_lock(&block_group->lock); | |
11833d66 | 510 | block_group->caching_ctl = NULL; |
817d52f8 JB |
511 | block_group->cached = BTRFS_CACHE_FINISHED; |
512 | spin_unlock(&block_group->lock); | |
0f9dd46c | 513 | |
54aa1f4d | 514 | err: |
e37c9e69 | 515 | btrfs_free_path(path); |
276e680d | 516 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 517 | |
11833d66 YZ |
518 | free_excluded_extents(extent_root, block_group); |
519 | ||
520 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 521 | out: |
36cce922 JB |
522 | if (ret) { |
523 | spin_lock(&block_group->lock); | |
524 | block_group->caching_ctl = NULL; | |
525 | block_group->cached = BTRFS_CACHE_ERROR; | |
526 | spin_unlock(&block_group->lock); | |
527 | } | |
11833d66 YZ |
528 | wake_up(&caching_ctl->wait); |
529 | ||
530 | put_caching_control(caching_ctl); | |
11dfe35a | 531 | btrfs_put_block_group(block_group); |
817d52f8 JB |
532 | } |
533 | ||
9d66e233 | 534 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 535 | int load_cache_only) |
817d52f8 | 536 | { |
291c7d2f | 537 | DEFINE_WAIT(wait); |
11833d66 YZ |
538 | struct btrfs_fs_info *fs_info = cache->fs_info; |
539 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
540 | int ret = 0; |
541 | ||
291c7d2f | 542 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
543 | if (!caching_ctl) |
544 | return -ENOMEM; | |
291c7d2f JB |
545 | |
546 | INIT_LIST_HEAD(&caching_ctl->list); | |
547 | mutex_init(&caching_ctl->mutex); | |
548 | init_waitqueue_head(&caching_ctl->wait); | |
549 | caching_ctl->block_group = cache; | |
550 | caching_ctl->progress = cache->key.objectid; | |
551 | atomic_set(&caching_ctl->count, 1); | |
552 | caching_ctl->work.func = caching_thread; | |
553 | ||
554 | spin_lock(&cache->lock); | |
555 | /* | |
556 | * This should be a rare occasion, but this could happen I think in the | |
557 | * case where one thread starts to load the space cache info, and then | |
558 | * some other thread starts a transaction commit which tries to do an | |
559 | * allocation while the other thread is still loading the space cache | |
560 | * info. The previous loop should have kept us from choosing this block | |
561 | * group, but if we've moved to the state where we will wait on caching | |
562 | * block groups we need to first check if we're doing a fast load here, | |
563 | * so we can wait for it to finish, otherwise we could end up allocating | |
564 | * from a block group who's cache gets evicted for one reason or | |
565 | * another. | |
566 | */ | |
567 | while (cache->cached == BTRFS_CACHE_FAST) { | |
568 | struct btrfs_caching_control *ctl; | |
569 | ||
570 | ctl = cache->caching_ctl; | |
571 | atomic_inc(&ctl->count); | |
572 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
573 | spin_unlock(&cache->lock); | |
574 | ||
575 | schedule(); | |
576 | ||
577 | finish_wait(&ctl->wait, &wait); | |
578 | put_caching_control(ctl); | |
579 | spin_lock(&cache->lock); | |
580 | } | |
581 | ||
582 | if (cache->cached != BTRFS_CACHE_NO) { | |
583 | spin_unlock(&cache->lock); | |
584 | kfree(caching_ctl); | |
11833d66 | 585 | return 0; |
291c7d2f JB |
586 | } |
587 | WARN_ON(cache->caching_ctl); | |
588 | cache->caching_ctl = caching_ctl; | |
589 | cache->cached = BTRFS_CACHE_FAST; | |
590 | spin_unlock(&cache->lock); | |
11833d66 | 591 | |
d53ba474 | 592 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
593 | ret = load_free_space_cache(fs_info, cache); |
594 | ||
595 | spin_lock(&cache->lock); | |
596 | if (ret == 1) { | |
291c7d2f | 597 | cache->caching_ctl = NULL; |
9d66e233 JB |
598 | cache->cached = BTRFS_CACHE_FINISHED; |
599 | cache->last_byte_to_unpin = (u64)-1; | |
600 | } else { | |
291c7d2f JB |
601 | if (load_cache_only) { |
602 | cache->caching_ctl = NULL; | |
603 | cache->cached = BTRFS_CACHE_NO; | |
604 | } else { | |
605 | cache->cached = BTRFS_CACHE_STARTED; | |
606 | } | |
9d66e233 JB |
607 | } |
608 | spin_unlock(&cache->lock); | |
291c7d2f | 609 | wake_up(&caching_ctl->wait); |
3c14874a | 610 | if (ret == 1) { |
291c7d2f | 611 | put_caching_control(caching_ctl); |
3c14874a | 612 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 613 | return 0; |
3c14874a | 614 | } |
291c7d2f JB |
615 | } else { |
616 | /* | |
617 | * We are not going to do the fast caching, set cached to the | |
618 | * appropriate value and wakeup any waiters. | |
619 | */ | |
620 | spin_lock(&cache->lock); | |
621 | if (load_cache_only) { | |
622 | cache->caching_ctl = NULL; | |
623 | cache->cached = BTRFS_CACHE_NO; | |
624 | } else { | |
625 | cache->cached = BTRFS_CACHE_STARTED; | |
626 | } | |
627 | spin_unlock(&cache->lock); | |
628 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
629 | } |
630 | ||
291c7d2f JB |
631 | if (load_cache_only) { |
632 | put_caching_control(caching_ctl); | |
11833d66 | 633 | return 0; |
817d52f8 | 634 | } |
817d52f8 | 635 | |
11833d66 | 636 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 637 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
638 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
639 | up_write(&fs_info->extent_commit_sem); | |
640 | ||
11dfe35a | 641 | btrfs_get_block_group(cache); |
11833d66 | 642 | |
bab39bf9 | 643 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 644 | |
ef8bbdfe | 645 | return ret; |
e37c9e69 CM |
646 | } |
647 | ||
0f9dd46c JB |
648 | /* |
649 | * return the block group that starts at or after bytenr | |
650 | */ | |
d397712b CM |
651 | static struct btrfs_block_group_cache * |
652 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 653 | { |
0f9dd46c | 654 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 655 | |
0f9dd46c | 656 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 657 | |
0f9dd46c | 658 | return cache; |
0ef3e66b CM |
659 | } |
660 | ||
0f9dd46c | 661 | /* |
9f55684c | 662 | * return the block group that contains the given bytenr |
0f9dd46c | 663 | */ |
d397712b CM |
664 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
665 | struct btrfs_fs_info *info, | |
666 | u64 bytenr) | |
be744175 | 667 | { |
0f9dd46c | 668 | struct btrfs_block_group_cache *cache; |
be744175 | 669 | |
0f9dd46c | 670 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 671 | |
0f9dd46c | 672 | return cache; |
be744175 | 673 | } |
0b86a832 | 674 | |
0f9dd46c JB |
675 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
676 | u64 flags) | |
6324fbf3 | 677 | { |
0f9dd46c | 678 | struct list_head *head = &info->space_info; |
0f9dd46c | 679 | struct btrfs_space_info *found; |
4184ea7f | 680 | |
52ba6929 | 681 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 682 | |
4184ea7f CM |
683 | rcu_read_lock(); |
684 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 685 | if (found->flags & flags) { |
4184ea7f | 686 | rcu_read_unlock(); |
0f9dd46c | 687 | return found; |
4184ea7f | 688 | } |
0f9dd46c | 689 | } |
4184ea7f | 690 | rcu_read_unlock(); |
0f9dd46c | 691 | return NULL; |
6324fbf3 CM |
692 | } |
693 | ||
4184ea7f CM |
694 | /* |
695 | * after adding space to the filesystem, we need to clear the full flags | |
696 | * on all the space infos. | |
697 | */ | |
698 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
699 | { | |
700 | struct list_head *head = &info->space_info; | |
701 | struct btrfs_space_info *found; | |
702 | ||
703 | rcu_read_lock(); | |
704 | list_for_each_entry_rcu(found, head, list) | |
705 | found->full = 0; | |
706 | rcu_read_unlock(); | |
707 | } | |
708 | ||
e02119d5 | 709 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 710 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
711 | { |
712 | int ret; | |
713 | struct btrfs_key key; | |
31840ae1 | 714 | struct btrfs_path *path; |
e02119d5 | 715 | |
31840ae1 | 716 | path = btrfs_alloc_path(); |
d8926bb3 MF |
717 | if (!path) |
718 | return -ENOMEM; | |
719 | ||
e02119d5 CM |
720 | key.objectid = start; |
721 | key.offset = len; | |
3173a18f | 722 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
723 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
724 | 0, 0); | |
3173a18f JB |
725 | if (ret > 0) { |
726 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
727 | if (key.objectid == start && | |
728 | key.type == BTRFS_METADATA_ITEM_KEY) | |
729 | ret = 0; | |
730 | } | |
31840ae1 | 731 | btrfs_free_path(path); |
7bb86316 CM |
732 | return ret; |
733 | } | |
734 | ||
a22285a6 | 735 | /* |
3173a18f | 736 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
737 | * |
738 | * the head node for delayed ref is used to store the sum of all the | |
739 | * reference count modifications queued up in the rbtree. the head | |
740 | * node may also store the extent flags to set. This way you can check | |
741 | * to see what the reference count and extent flags would be if all of | |
742 | * the delayed refs are not processed. | |
743 | */ | |
744 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
745 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 746 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
747 | { |
748 | struct btrfs_delayed_ref_head *head; | |
749 | struct btrfs_delayed_ref_root *delayed_refs; | |
750 | struct btrfs_path *path; | |
751 | struct btrfs_extent_item *ei; | |
752 | struct extent_buffer *leaf; | |
753 | struct btrfs_key key; | |
754 | u32 item_size; | |
755 | u64 num_refs; | |
756 | u64 extent_flags; | |
757 | int ret; | |
758 | ||
3173a18f JB |
759 | /* |
760 | * If we don't have skinny metadata, don't bother doing anything | |
761 | * different | |
762 | */ | |
763 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
764 | offset = root->leafsize; | |
765 | metadata = 0; | |
766 | } | |
767 | ||
a22285a6 YZ |
768 | path = btrfs_alloc_path(); |
769 | if (!path) | |
770 | return -ENOMEM; | |
771 | ||
a22285a6 YZ |
772 | if (!trans) { |
773 | path->skip_locking = 1; | |
774 | path->search_commit_root = 1; | |
775 | } | |
639eefc8 FDBM |
776 | |
777 | search_again: | |
778 | key.objectid = bytenr; | |
779 | key.offset = offset; | |
780 | if (metadata) | |
781 | key.type = BTRFS_METADATA_ITEM_KEY; | |
782 | else | |
783 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
784 | ||
a22285a6 YZ |
785 | again: |
786 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
787 | &key, path, 0, 0); | |
788 | if (ret < 0) | |
789 | goto out_free; | |
790 | ||
3173a18f | 791 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
792 | if (path->slots[0]) { |
793 | path->slots[0]--; | |
794 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
795 | path->slots[0]); | |
796 | if (key.objectid == bytenr && | |
797 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
798 | key.offset == root->leafsize) | |
799 | ret = 0; | |
800 | } | |
801 | if (ret) { | |
802 | key.objectid = bytenr; | |
803 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
804 | key.offset = root->leafsize; | |
805 | btrfs_release_path(path); | |
806 | goto again; | |
807 | } | |
3173a18f JB |
808 | } |
809 | ||
a22285a6 YZ |
810 | if (ret == 0) { |
811 | leaf = path->nodes[0]; | |
812 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
813 | if (item_size >= sizeof(*ei)) { | |
814 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
815 | struct btrfs_extent_item); | |
816 | num_refs = btrfs_extent_refs(leaf, ei); | |
817 | extent_flags = btrfs_extent_flags(leaf, ei); | |
818 | } else { | |
819 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
820 | struct btrfs_extent_item_v0 *ei0; | |
821 | BUG_ON(item_size != sizeof(*ei0)); | |
822 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
823 | struct btrfs_extent_item_v0); | |
824 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
825 | /* FIXME: this isn't correct for data */ | |
826 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
827 | #else | |
828 | BUG(); | |
829 | #endif | |
830 | } | |
831 | BUG_ON(num_refs == 0); | |
832 | } else { | |
833 | num_refs = 0; | |
834 | extent_flags = 0; | |
835 | ret = 0; | |
836 | } | |
837 | ||
838 | if (!trans) | |
839 | goto out; | |
840 | ||
841 | delayed_refs = &trans->transaction->delayed_refs; | |
842 | spin_lock(&delayed_refs->lock); | |
843 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
844 | if (head) { | |
845 | if (!mutex_trylock(&head->mutex)) { | |
846 | atomic_inc(&head->node.refs); | |
847 | spin_unlock(&delayed_refs->lock); | |
848 | ||
b3b4aa74 | 849 | btrfs_release_path(path); |
a22285a6 | 850 | |
8cc33e5c DS |
851 | /* |
852 | * Mutex was contended, block until it's released and try | |
853 | * again | |
854 | */ | |
a22285a6 YZ |
855 | mutex_lock(&head->mutex); |
856 | mutex_unlock(&head->mutex); | |
857 | btrfs_put_delayed_ref(&head->node); | |
639eefc8 | 858 | goto search_again; |
a22285a6 | 859 | } |
d7df2c79 | 860 | spin_lock(&head->lock); |
a22285a6 YZ |
861 | if (head->extent_op && head->extent_op->update_flags) |
862 | extent_flags |= head->extent_op->flags_to_set; | |
863 | else | |
864 | BUG_ON(num_refs == 0); | |
865 | ||
866 | num_refs += head->node.ref_mod; | |
d7df2c79 | 867 | spin_unlock(&head->lock); |
a22285a6 YZ |
868 | mutex_unlock(&head->mutex); |
869 | } | |
870 | spin_unlock(&delayed_refs->lock); | |
871 | out: | |
872 | WARN_ON(num_refs == 0); | |
873 | if (refs) | |
874 | *refs = num_refs; | |
875 | if (flags) | |
876 | *flags = extent_flags; | |
877 | out_free: | |
878 | btrfs_free_path(path); | |
879 | return ret; | |
880 | } | |
881 | ||
d8d5f3e1 CM |
882 | /* |
883 | * Back reference rules. Back refs have three main goals: | |
884 | * | |
885 | * 1) differentiate between all holders of references to an extent so that | |
886 | * when a reference is dropped we can make sure it was a valid reference | |
887 | * before freeing the extent. | |
888 | * | |
889 | * 2) Provide enough information to quickly find the holders of an extent | |
890 | * if we notice a given block is corrupted or bad. | |
891 | * | |
892 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
893 | * maintenance. This is actually the same as #2, but with a slightly | |
894 | * different use case. | |
895 | * | |
5d4f98a2 YZ |
896 | * There are two kinds of back refs. The implicit back refs is optimized |
897 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
898 | * back refs of this kind provide information about the block's owner tree | |
899 | * and the pointer's key. These information allow us to find the block by | |
900 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
901 | * referenced by their owner trees. The location of tree block is recorded | |
902 | * in the back refs. Actually the full back refs is generic, and can be | |
903 | * used in all cases the implicit back refs is used. The major shortcoming | |
904 | * of the full back refs is its overhead. Every time a tree block gets | |
905 | * COWed, we have to update back refs entry for all pointers in it. | |
906 | * | |
907 | * For a newly allocated tree block, we use implicit back refs for | |
908 | * pointers in it. This means most tree related operations only involve | |
909 | * implicit back refs. For a tree block created in old transaction, the | |
910 | * only way to drop a reference to it is COW it. So we can detect the | |
911 | * event that tree block loses its owner tree's reference and do the | |
912 | * back refs conversion. | |
913 | * | |
914 | * When a tree block is COW'd through a tree, there are four cases: | |
915 | * | |
916 | * The reference count of the block is one and the tree is the block's | |
917 | * owner tree. Nothing to do in this case. | |
918 | * | |
919 | * The reference count of the block is one and the tree is not the | |
920 | * block's owner tree. In this case, full back refs is used for pointers | |
921 | * in the block. Remove these full back refs, add implicit back refs for | |
922 | * every pointers in the new block. | |
923 | * | |
924 | * The reference count of the block is greater than one and the tree is | |
925 | * the block's owner tree. In this case, implicit back refs is used for | |
926 | * pointers in the block. Add full back refs for every pointers in the | |
927 | * block, increase lower level extents' reference counts. The original | |
928 | * implicit back refs are entailed to the new block. | |
929 | * | |
930 | * The reference count of the block is greater than one and the tree is | |
931 | * not the block's owner tree. Add implicit back refs for every pointer in | |
932 | * the new block, increase lower level extents' reference count. | |
933 | * | |
934 | * Back Reference Key composing: | |
935 | * | |
936 | * The key objectid corresponds to the first byte in the extent, | |
937 | * The key type is used to differentiate between types of back refs. | |
938 | * There are different meanings of the key offset for different types | |
939 | * of back refs. | |
940 | * | |
d8d5f3e1 CM |
941 | * File extents can be referenced by: |
942 | * | |
943 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 944 | * - different files inside a single subvolume |
d8d5f3e1 CM |
945 | * - different offsets inside a file (bookend extents in file.c) |
946 | * | |
5d4f98a2 | 947 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
948 | * |
949 | * - Objectid of the subvolume root | |
d8d5f3e1 | 950 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
951 | * - original offset in the file |
952 | * - how many bookend extents | |
d8d5f3e1 | 953 | * |
5d4f98a2 YZ |
954 | * The key offset for the implicit back refs is hash of the first |
955 | * three fields. | |
d8d5f3e1 | 956 | * |
5d4f98a2 | 957 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 958 | * |
5d4f98a2 | 959 | * - number of pointers in the tree leaf |
d8d5f3e1 | 960 | * |
5d4f98a2 YZ |
961 | * The key offset for the implicit back refs is the first byte of |
962 | * the tree leaf | |
d8d5f3e1 | 963 | * |
5d4f98a2 YZ |
964 | * When a file extent is allocated, The implicit back refs is used. |
965 | * the fields are filled in: | |
d8d5f3e1 | 966 | * |
5d4f98a2 | 967 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 968 | * |
5d4f98a2 YZ |
969 | * When a file extent is removed file truncation, we find the |
970 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 971 | * |
5d4f98a2 | 972 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 973 | * |
5d4f98a2 | 974 | * Btree extents can be referenced by: |
d8d5f3e1 | 975 | * |
5d4f98a2 | 976 | * - Different subvolumes |
d8d5f3e1 | 977 | * |
5d4f98a2 YZ |
978 | * Both the implicit back refs and the full back refs for tree blocks |
979 | * only consist of key. The key offset for the implicit back refs is | |
980 | * objectid of block's owner tree. The key offset for the full back refs | |
981 | * is the first byte of parent block. | |
d8d5f3e1 | 982 | * |
5d4f98a2 YZ |
983 | * When implicit back refs is used, information about the lowest key and |
984 | * level of the tree block are required. These information are stored in | |
985 | * tree block info structure. | |
d8d5f3e1 | 986 | */ |
31840ae1 | 987 | |
5d4f98a2 YZ |
988 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
989 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
990 | struct btrfs_root *root, | |
991 | struct btrfs_path *path, | |
992 | u64 owner, u32 extra_size) | |
7bb86316 | 993 | { |
5d4f98a2 YZ |
994 | struct btrfs_extent_item *item; |
995 | struct btrfs_extent_item_v0 *ei0; | |
996 | struct btrfs_extent_ref_v0 *ref0; | |
997 | struct btrfs_tree_block_info *bi; | |
998 | struct extent_buffer *leaf; | |
7bb86316 | 999 | struct btrfs_key key; |
5d4f98a2 YZ |
1000 | struct btrfs_key found_key; |
1001 | u32 new_size = sizeof(*item); | |
1002 | u64 refs; | |
1003 | int ret; | |
1004 | ||
1005 | leaf = path->nodes[0]; | |
1006 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
1007 | ||
1008 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1009 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1010 | struct btrfs_extent_item_v0); | |
1011 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1012 | ||
1013 | if (owner == (u64)-1) { | |
1014 | while (1) { | |
1015 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1016 | ret = btrfs_next_leaf(root, path); | |
1017 | if (ret < 0) | |
1018 | return ret; | |
79787eaa | 1019 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1020 | leaf = path->nodes[0]; |
1021 | } | |
1022 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1023 | path->slots[0]); | |
1024 | BUG_ON(key.objectid != found_key.objectid); | |
1025 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1026 | path->slots[0]++; | |
1027 | continue; | |
1028 | } | |
1029 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1030 | struct btrfs_extent_ref_v0); | |
1031 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1032 | break; | |
1033 | } | |
1034 | } | |
b3b4aa74 | 1035 | btrfs_release_path(path); |
5d4f98a2 YZ |
1036 | |
1037 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1038 | new_size += sizeof(*bi); | |
1039 | ||
1040 | new_size -= sizeof(*ei0); | |
1041 | ret = btrfs_search_slot(trans, root, &key, path, | |
1042 | new_size + extra_size, 1); | |
1043 | if (ret < 0) | |
1044 | return ret; | |
79787eaa | 1045 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1046 | |
4b90c680 | 1047 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1048 | |
1049 | leaf = path->nodes[0]; | |
1050 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1051 | btrfs_set_extent_refs(leaf, item, refs); | |
1052 | /* FIXME: get real generation */ | |
1053 | btrfs_set_extent_generation(leaf, item, 0); | |
1054 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1055 | btrfs_set_extent_flags(leaf, item, | |
1056 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1057 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1058 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1059 | /* FIXME: get first key of the block */ | |
1060 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1061 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1062 | } else { | |
1063 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1064 | } | |
1065 | btrfs_mark_buffer_dirty(leaf); | |
1066 | return 0; | |
1067 | } | |
1068 | #endif | |
1069 | ||
1070 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1071 | { | |
1072 | u32 high_crc = ~(u32)0; | |
1073 | u32 low_crc = ~(u32)0; | |
1074 | __le64 lenum; | |
1075 | ||
1076 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1077 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1078 | lenum = cpu_to_le64(owner); |
163e783e | 1079 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1080 | lenum = cpu_to_le64(offset); |
163e783e | 1081 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1082 | |
1083 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1084 | } | |
1085 | ||
1086 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1087 | struct btrfs_extent_data_ref *ref) | |
1088 | { | |
1089 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1090 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1091 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1092 | } | |
1093 | ||
1094 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1095 | struct btrfs_extent_data_ref *ref, | |
1096 | u64 root_objectid, u64 owner, u64 offset) | |
1097 | { | |
1098 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1099 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1100 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1101 | return 0; | |
1102 | return 1; | |
1103 | } | |
1104 | ||
1105 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1106 | struct btrfs_root *root, | |
1107 | struct btrfs_path *path, | |
1108 | u64 bytenr, u64 parent, | |
1109 | u64 root_objectid, | |
1110 | u64 owner, u64 offset) | |
1111 | { | |
1112 | struct btrfs_key key; | |
1113 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1114 | struct extent_buffer *leaf; |
5d4f98a2 | 1115 | u32 nritems; |
74493f7a | 1116 | int ret; |
5d4f98a2 YZ |
1117 | int recow; |
1118 | int err = -ENOENT; | |
74493f7a | 1119 | |
31840ae1 | 1120 | key.objectid = bytenr; |
5d4f98a2 YZ |
1121 | if (parent) { |
1122 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1123 | key.offset = parent; | |
1124 | } else { | |
1125 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1126 | key.offset = hash_extent_data_ref(root_objectid, | |
1127 | owner, offset); | |
1128 | } | |
1129 | again: | |
1130 | recow = 0; | |
1131 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1132 | if (ret < 0) { | |
1133 | err = ret; | |
1134 | goto fail; | |
1135 | } | |
31840ae1 | 1136 | |
5d4f98a2 YZ |
1137 | if (parent) { |
1138 | if (!ret) | |
1139 | return 0; | |
1140 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1141 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1142 | btrfs_release_path(path); |
5d4f98a2 YZ |
1143 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1144 | if (ret < 0) { | |
1145 | err = ret; | |
1146 | goto fail; | |
1147 | } | |
1148 | if (!ret) | |
1149 | return 0; | |
1150 | #endif | |
1151 | goto fail; | |
31840ae1 ZY |
1152 | } |
1153 | ||
1154 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1155 | nritems = btrfs_header_nritems(leaf); |
1156 | while (1) { | |
1157 | if (path->slots[0] >= nritems) { | |
1158 | ret = btrfs_next_leaf(root, path); | |
1159 | if (ret < 0) | |
1160 | err = ret; | |
1161 | if (ret) | |
1162 | goto fail; | |
1163 | ||
1164 | leaf = path->nodes[0]; | |
1165 | nritems = btrfs_header_nritems(leaf); | |
1166 | recow = 1; | |
1167 | } | |
1168 | ||
1169 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1170 | if (key.objectid != bytenr || | |
1171 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1172 | goto fail; | |
1173 | ||
1174 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1175 | struct btrfs_extent_data_ref); | |
1176 | ||
1177 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1178 | owner, offset)) { | |
1179 | if (recow) { | |
b3b4aa74 | 1180 | btrfs_release_path(path); |
5d4f98a2 YZ |
1181 | goto again; |
1182 | } | |
1183 | err = 0; | |
1184 | break; | |
1185 | } | |
1186 | path->slots[0]++; | |
31840ae1 | 1187 | } |
5d4f98a2 YZ |
1188 | fail: |
1189 | return err; | |
31840ae1 ZY |
1190 | } |
1191 | ||
5d4f98a2 YZ |
1192 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1193 | struct btrfs_root *root, | |
1194 | struct btrfs_path *path, | |
1195 | u64 bytenr, u64 parent, | |
1196 | u64 root_objectid, u64 owner, | |
1197 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1198 | { |
1199 | struct btrfs_key key; | |
1200 | struct extent_buffer *leaf; | |
5d4f98a2 | 1201 | u32 size; |
31840ae1 ZY |
1202 | u32 num_refs; |
1203 | int ret; | |
74493f7a | 1204 | |
74493f7a | 1205 | key.objectid = bytenr; |
5d4f98a2 YZ |
1206 | if (parent) { |
1207 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1208 | key.offset = parent; | |
1209 | size = sizeof(struct btrfs_shared_data_ref); | |
1210 | } else { | |
1211 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1212 | key.offset = hash_extent_data_ref(root_objectid, | |
1213 | owner, offset); | |
1214 | size = sizeof(struct btrfs_extent_data_ref); | |
1215 | } | |
74493f7a | 1216 | |
5d4f98a2 YZ |
1217 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1218 | if (ret && ret != -EEXIST) | |
1219 | goto fail; | |
1220 | ||
1221 | leaf = path->nodes[0]; | |
1222 | if (parent) { | |
1223 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1224 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1225 | struct btrfs_shared_data_ref); |
1226 | if (ret == 0) { | |
1227 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1228 | } else { | |
1229 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1230 | num_refs += refs_to_add; | |
1231 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1232 | } |
5d4f98a2 YZ |
1233 | } else { |
1234 | struct btrfs_extent_data_ref *ref; | |
1235 | while (ret == -EEXIST) { | |
1236 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1237 | struct btrfs_extent_data_ref); | |
1238 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1239 | owner, offset)) | |
1240 | break; | |
b3b4aa74 | 1241 | btrfs_release_path(path); |
5d4f98a2 YZ |
1242 | key.offset++; |
1243 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1244 | size); | |
1245 | if (ret && ret != -EEXIST) | |
1246 | goto fail; | |
31840ae1 | 1247 | |
5d4f98a2 YZ |
1248 | leaf = path->nodes[0]; |
1249 | } | |
1250 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1251 | struct btrfs_extent_data_ref); | |
1252 | if (ret == 0) { | |
1253 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1254 | root_objectid); | |
1255 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1256 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1257 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1258 | } else { | |
1259 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1260 | num_refs += refs_to_add; | |
1261 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1262 | } |
31840ae1 | 1263 | } |
5d4f98a2 YZ |
1264 | btrfs_mark_buffer_dirty(leaf); |
1265 | ret = 0; | |
1266 | fail: | |
b3b4aa74 | 1267 | btrfs_release_path(path); |
7bb86316 | 1268 | return ret; |
74493f7a CM |
1269 | } |
1270 | ||
5d4f98a2 YZ |
1271 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1272 | struct btrfs_root *root, | |
1273 | struct btrfs_path *path, | |
1274 | int refs_to_drop) | |
31840ae1 | 1275 | { |
5d4f98a2 YZ |
1276 | struct btrfs_key key; |
1277 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1278 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1279 | struct extent_buffer *leaf; |
5d4f98a2 | 1280 | u32 num_refs = 0; |
31840ae1 ZY |
1281 | int ret = 0; |
1282 | ||
1283 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1284 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1285 | ||
1286 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1287 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1288 | struct btrfs_extent_data_ref); | |
1289 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1290 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1291 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1292 | struct btrfs_shared_data_ref); | |
1293 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1294 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1295 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1296 | struct btrfs_extent_ref_v0 *ref0; | |
1297 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1298 | struct btrfs_extent_ref_v0); | |
1299 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1300 | #endif | |
1301 | } else { | |
1302 | BUG(); | |
1303 | } | |
1304 | ||
56bec294 CM |
1305 | BUG_ON(num_refs < refs_to_drop); |
1306 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1307 | |
31840ae1 ZY |
1308 | if (num_refs == 0) { |
1309 | ret = btrfs_del_item(trans, root, path); | |
1310 | } else { | |
5d4f98a2 YZ |
1311 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1312 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1313 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1314 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1315 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1316 | else { | |
1317 | struct btrfs_extent_ref_v0 *ref0; | |
1318 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1319 | struct btrfs_extent_ref_v0); | |
1320 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1321 | } | |
1322 | #endif | |
31840ae1 ZY |
1323 | btrfs_mark_buffer_dirty(leaf); |
1324 | } | |
31840ae1 ZY |
1325 | return ret; |
1326 | } | |
1327 | ||
5d4f98a2 YZ |
1328 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1329 | struct btrfs_path *path, | |
1330 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1331 | { |
5d4f98a2 YZ |
1332 | struct btrfs_key key; |
1333 | struct extent_buffer *leaf; | |
1334 | struct btrfs_extent_data_ref *ref1; | |
1335 | struct btrfs_shared_data_ref *ref2; | |
1336 | u32 num_refs = 0; | |
1337 | ||
1338 | leaf = path->nodes[0]; | |
1339 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1340 | if (iref) { | |
1341 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1342 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1343 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1344 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1345 | } else { | |
1346 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1347 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1348 | } | |
1349 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1350 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1351 | struct btrfs_extent_data_ref); | |
1352 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1353 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1354 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1355 | struct btrfs_shared_data_ref); | |
1356 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1357 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1358 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1359 | struct btrfs_extent_ref_v0 *ref0; | |
1360 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1361 | struct btrfs_extent_ref_v0); | |
1362 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1363 | #endif |
5d4f98a2 YZ |
1364 | } else { |
1365 | WARN_ON(1); | |
1366 | } | |
1367 | return num_refs; | |
1368 | } | |
15916de8 | 1369 | |
5d4f98a2 YZ |
1370 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1371 | struct btrfs_root *root, | |
1372 | struct btrfs_path *path, | |
1373 | u64 bytenr, u64 parent, | |
1374 | u64 root_objectid) | |
1f3c79a2 | 1375 | { |
5d4f98a2 | 1376 | struct btrfs_key key; |
1f3c79a2 | 1377 | int ret; |
1f3c79a2 | 1378 | |
5d4f98a2 YZ |
1379 | key.objectid = bytenr; |
1380 | if (parent) { | |
1381 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1382 | key.offset = parent; | |
1383 | } else { | |
1384 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1385 | key.offset = root_objectid; | |
1f3c79a2 LH |
1386 | } |
1387 | ||
5d4f98a2 YZ |
1388 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1389 | if (ret > 0) | |
1390 | ret = -ENOENT; | |
1391 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1392 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1393 | btrfs_release_path(path); |
5d4f98a2 YZ |
1394 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1395 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1396 | if (ret > 0) | |
1397 | ret = -ENOENT; | |
1398 | } | |
1f3c79a2 | 1399 | #endif |
5d4f98a2 | 1400 | return ret; |
1f3c79a2 LH |
1401 | } |
1402 | ||
5d4f98a2 YZ |
1403 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1404 | struct btrfs_root *root, | |
1405 | struct btrfs_path *path, | |
1406 | u64 bytenr, u64 parent, | |
1407 | u64 root_objectid) | |
31840ae1 | 1408 | { |
5d4f98a2 | 1409 | struct btrfs_key key; |
31840ae1 | 1410 | int ret; |
31840ae1 | 1411 | |
5d4f98a2 YZ |
1412 | key.objectid = bytenr; |
1413 | if (parent) { | |
1414 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1415 | key.offset = parent; | |
1416 | } else { | |
1417 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1418 | key.offset = root_objectid; | |
1419 | } | |
1420 | ||
1421 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1422 | btrfs_release_path(path); |
31840ae1 ZY |
1423 | return ret; |
1424 | } | |
1425 | ||
5d4f98a2 | 1426 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1427 | { |
5d4f98a2 YZ |
1428 | int type; |
1429 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1430 | if (parent > 0) | |
1431 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1432 | else | |
1433 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1434 | } else { | |
1435 | if (parent > 0) | |
1436 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1437 | else | |
1438 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1439 | } | |
1440 | return type; | |
31840ae1 | 1441 | } |
56bec294 | 1442 | |
2c47e605 YZ |
1443 | static int find_next_key(struct btrfs_path *path, int level, |
1444 | struct btrfs_key *key) | |
56bec294 | 1445 | |
02217ed2 | 1446 | { |
2c47e605 | 1447 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1448 | if (!path->nodes[level]) |
1449 | break; | |
5d4f98a2 YZ |
1450 | if (path->slots[level] + 1 >= |
1451 | btrfs_header_nritems(path->nodes[level])) | |
1452 | continue; | |
1453 | if (level == 0) | |
1454 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1455 | path->slots[level] + 1); | |
1456 | else | |
1457 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1458 | path->slots[level] + 1); | |
1459 | return 0; | |
1460 | } | |
1461 | return 1; | |
1462 | } | |
037e6390 | 1463 | |
5d4f98a2 YZ |
1464 | /* |
1465 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1466 | * to the address of inline back ref, and 0 is returned. | |
1467 | * | |
1468 | * if back ref isn't found, *ref_ret is set to the address where it | |
1469 | * should be inserted, and -ENOENT is returned. | |
1470 | * | |
1471 | * if insert is true and there are too many inline back refs, the path | |
1472 | * points to the extent item, and -EAGAIN is returned. | |
1473 | * | |
1474 | * NOTE: inline back refs are ordered in the same way that back ref | |
1475 | * items in the tree are ordered. | |
1476 | */ | |
1477 | static noinline_for_stack | |
1478 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1479 | struct btrfs_root *root, | |
1480 | struct btrfs_path *path, | |
1481 | struct btrfs_extent_inline_ref **ref_ret, | |
1482 | u64 bytenr, u64 num_bytes, | |
1483 | u64 parent, u64 root_objectid, | |
1484 | u64 owner, u64 offset, int insert) | |
1485 | { | |
1486 | struct btrfs_key key; | |
1487 | struct extent_buffer *leaf; | |
1488 | struct btrfs_extent_item *ei; | |
1489 | struct btrfs_extent_inline_ref *iref; | |
1490 | u64 flags; | |
1491 | u64 item_size; | |
1492 | unsigned long ptr; | |
1493 | unsigned long end; | |
1494 | int extra_size; | |
1495 | int type; | |
1496 | int want; | |
1497 | int ret; | |
1498 | int err = 0; | |
3173a18f JB |
1499 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1500 | SKINNY_METADATA); | |
26b8003f | 1501 | |
db94535d | 1502 | key.objectid = bytenr; |
31840ae1 | 1503 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1504 | key.offset = num_bytes; |
31840ae1 | 1505 | |
5d4f98a2 YZ |
1506 | want = extent_ref_type(parent, owner); |
1507 | if (insert) { | |
1508 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1509 | path->keep_locks = 1; |
5d4f98a2 YZ |
1510 | } else |
1511 | extra_size = -1; | |
3173a18f JB |
1512 | |
1513 | /* | |
1514 | * Owner is our parent level, so we can just add one to get the level | |
1515 | * for the block we are interested in. | |
1516 | */ | |
1517 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1518 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1519 | key.offset = owner; | |
1520 | } | |
1521 | ||
1522 | again: | |
5d4f98a2 | 1523 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1524 | if (ret < 0) { |
5d4f98a2 YZ |
1525 | err = ret; |
1526 | goto out; | |
1527 | } | |
3173a18f JB |
1528 | |
1529 | /* | |
1530 | * We may be a newly converted file system which still has the old fat | |
1531 | * extent entries for metadata, so try and see if we have one of those. | |
1532 | */ | |
1533 | if (ret > 0 && skinny_metadata) { | |
1534 | skinny_metadata = false; | |
1535 | if (path->slots[0]) { | |
1536 | path->slots[0]--; | |
1537 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1538 | path->slots[0]); | |
1539 | if (key.objectid == bytenr && | |
1540 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1541 | key.offset == num_bytes) | |
1542 | ret = 0; | |
1543 | } | |
1544 | if (ret) { | |
1545 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1546 | key.offset = num_bytes; | |
1547 | btrfs_release_path(path); | |
1548 | goto again; | |
1549 | } | |
1550 | } | |
1551 | ||
79787eaa JM |
1552 | if (ret && !insert) { |
1553 | err = -ENOENT; | |
1554 | goto out; | |
fae7f21c | 1555 | } else if (WARN_ON(ret)) { |
492104c8 | 1556 | err = -EIO; |
492104c8 | 1557 | goto out; |
79787eaa | 1558 | } |
5d4f98a2 YZ |
1559 | |
1560 | leaf = path->nodes[0]; | |
1561 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1562 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1563 | if (item_size < sizeof(*ei)) { | |
1564 | if (!insert) { | |
1565 | err = -ENOENT; | |
1566 | goto out; | |
1567 | } | |
1568 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1569 | extra_size); | |
1570 | if (ret < 0) { | |
1571 | err = ret; | |
1572 | goto out; | |
1573 | } | |
1574 | leaf = path->nodes[0]; | |
1575 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1576 | } | |
1577 | #endif | |
1578 | BUG_ON(item_size < sizeof(*ei)); | |
1579 | ||
5d4f98a2 YZ |
1580 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1581 | flags = btrfs_extent_flags(leaf, ei); | |
1582 | ||
1583 | ptr = (unsigned long)(ei + 1); | |
1584 | end = (unsigned long)ei + item_size; | |
1585 | ||
3173a18f | 1586 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1587 | ptr += sizeof(struct btrfs_tree_block_info); |
1588 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1589 | } |
1590 | ||
1591 | err = -ENOENT; | |
1592 | while (1) { | |
1593 | if (ptr >= end) { | |
1594 | WARN_ON(ptr > end); | |
1595 | break; | |
1596 | } | |
1597 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1598 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1599 | if (want < type) | |
1600 | break; | |
1601 | if (want > type) { | |
1602 | ptr += btrfs_extent_inline_ref_size(type); | |
1603 | continue; | |
1604 | } | |
1605 | ||
1606 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1607 | struct btrfs_extent_data_ref *dref; | |
1608 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1609 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1610 | owner, offset)) { | |
1611 | err = 0; | |
1612 | break; | |
1613 | } | |
1614 | if (hash_extent_data_ref_item(leaf, dref) < | |
1615 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1616 | break; | |
1617 | } else { | |
1618 | u64 ref_offset; | |
1619 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1620 | if (parent > 0) { | |
1621 | if (parent == ref_offset) { | |
1622 | err = 0; | |
1623 | break; | |
1624 | } | |
1625 | if (ref_offset < parent) | |
1626 | break; | |
1627 | } else { | |
1628 | if (root_objectid == ref_offset) { | |
1629 | err = 0; | |
1630 | break; | |
1631 | } | |
1632 | if (ref_offset < root_objectid) | |
1633 | break; | |
1634 | } | |
1635 | } | |
1636 | ptr += btrfs_extent_inline_ref_size(type); | |
1637 | } | |
1638 | if (err == -ENOENT && insert) { | |
1639 | if (item_size + extra_size >= | |
1640 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1641 | err = -EAGAIN; | |
1642 | goto out; | |
1643 | } | |
1644 | /* | |
1645 | * To add new inline back ref, we have to make sure | |
1646 | * there is no corresponding back ref item. | |
1647 | * For simplicity, we just do not add new inline back | |
1648 | * ref if there is any kind of item for this block | |
1649 | */ | |
2c47e605 YZ |
1650 | if (find_next_key(path, 0, &key) == 0 && |
1651 | key.objectid == bytenr && | |
85d4198e | 1652 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1653 | err = -EAGAIN; |
1654 | goto out; | |
1655 | } | |
1656 | } | |
1657 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1658 | out: | |
85d4198e | 1659 | if (insert) { |
5d4f98a2 YZ |
1660 | path->keep_locks = 0; |
1661 | btrfs_unlock_up_safe(path, 1); | |
1662 | } | |
1663 | return err; | |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * helper to add new inline back ref | |
1668 | */ | |
1669 | static noinline_for_stack | |
fd279fae | 1670 | void setup_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1671 | struct btrfs_path *path, |
1672 | struct btrfs_extent_inline_ref *iref, | |
1673 | u64 parent, u64 root_objectid, | |
1674 | u64 owner, u64 offset, int refs_to_add, | |
1675 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1676 | { |
1677 | struct extent_buffer *leaf; | |
1678 | struct btrfs_extent_item *ei; | |
1679 | unsigned long ptr; | |
1680 | unsigned long end; | |
1681 | unsigned long item_offset; | |
1682 | u64 refs; | |
1683 | int size; | |
1684 | int type; | |
5d4f98a2 YZ |
1685 | |
1686 | leaf = path->nodes[0]; | |
1687 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1688 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1689 | ||
1690 | type = extent_ref_type(parent, owner); | |
1691 | size = btrfs_extent_inline_ref_size(type); | |
1692 | ||
4b90c680 | 1693 | btrfs_extend_item(root, path, size); |
5d4f98a2 YZ |
1694 | |
1695 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1696 | refs = btrfs_extent_refs(leaf, ei); | |
1697 | refs += refs_to_add; | |
1698 | btrfs_set_extent_refs(leaf, ei, refs); | |
1699 | if (extent_op) | |
1700 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1701 | ||
1702 | ptr = (unsigned long)ei + item_offset; | |
1703 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1704 | if (ptr < end - size) | |
1705 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1706 | end - size - ptr); | |
1707 | ||
1708 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1709 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1710 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1711 | struct btrfs_extent_data_ref *dref; | |
1712 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1713 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1714 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1715 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1716 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1717 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1718 | struct btrfs_shared_data_ref *sref; | |
1719 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1720 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1721 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1722 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1723 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1724 | } else { | |
1725 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1726 | } | |
1727 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1728 | } |
1729 | ||
1730 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1731 | struct btrfs_root *root, | |
1732 | struct btrfs_path *path, | |
1733 | struct btrfs_extent_inline_ref **ref_ret, | |
1734 | u64 bytenr, u64 num_bytes, u64 parent, | |
1735 | u64 root_objectid, u64 owner, u64 offset) | |
1736 | { | |
1737 | int ret; | |
1738 | ||
1739 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1740 | bytenr, num_bytes, parent, | |
1741 | root_objectid, owner, offset, 0); | |
1742 | if (ret != -ENOENT) | |
54aa1f4d | 1743 | return ret; |
5d4f98a2 | 1744 | |
b3b4aa74 | 1745 | btrfs_release_path(path); |
5d4f98a2 YZ |
1746 | *ref_ret = NULL; |
1747 | ||
1748 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1749 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1750 | root_objectid); | |
1751 | } else { | |
1752 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1753 | root_objectid, owner, offset); | |
b9473439 | 1754 | } |
5d4f98a2 YZ |
1755 | return ret; |
1756 | } | |
31840ae1 | 1757 | |
5d4f98a2 YZ |
1758 | /* |
1759 | * helper to update/remove inline back ref | |
1760 | */ | |
1761 | static noinline_for_stack | |
afe5fea7 | 1762 | void update_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1763 | struct btrfs_path *path, |
1764 | struct btrfs_extent_inline_ref *iref, | |
1765 | int refs_to_mod, | |
1766 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1767 | { |
1768 | struct extent_buffer *leaf; | |
1769 | struct btrfs_extent_item *ei; | |
1770 | struct btrfs_extent_data_ref *dref = NULL; | |
1771 | struct btrfs_shared_data_ref *sref = NULL; | |
1772 | unsigned long ptr; | |
1773 | unsigned long end; | |
1774 | u32 item_size; | |
1775 | int size; | |
1776 | int type; | |
5d4f98a2 YZ |
1777 | u64 refs; |
1778 | ||
1779 | leaf = path->nodes[0]; | |
1780 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1781 | refs = btrfs_extent_refs(leaf, ei); | |
1782 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1783 | refs += refs_to_mod; | |
1784 | btrfs_set_extent_refs(leaf, ei, refs); | |
1785 | if (extent_op) | |
1786 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1787 | ||
1788 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1789 | ||
1790 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1791 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1792 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1793 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1794 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1795 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1796 | } else { | |
1797 | refs = 1; | |
1798 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1799 | } |
31840ae1 | 1800 | |
5d4f98a2 YZ |
1801 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1802 | refs += refs_to_mod; | |
1803 | ||
1804 | if (refs > 0) { | |
1805 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1806 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1807 | else | |
1808 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1809 | } else { | |
1810 | size = btrfs_extent_inline_ref_size(type); | |
1811 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1812 | ptr = (unsigned long)iref; | |
1813 | end = (unsigned long)ei + item_size; | |
1814 | if (ptr + size < end) | |
1815 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1816 | end - ptr - size); | |
1817 | item_size -= size; | |
afe5fea7 | 1818 | btrfs_truncate_item(root, path, item_size, 1); |
5d4f98a2 YZ |
1819 | } |
1820 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1821 | } |
1822 | ||
1823 | static noinline_for_stack | |
1824 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1825 | struct btrfs_root *root, | |
1826 | struct btrfs_path *path, | |
1827 | u64 bytenr, u64 num_bytes, u64 parent, | |
1828 | u64 root_objectid, u64 owner, | |
1829 | u64 offset, int refs_to_add, | |
1830 | struct btrfs_delayed_extent_op *extent_op) | |
1831 | { | |
1832 | struct btrfs_extent_inline_ref *iref; | |
1833 | int ret; | |
1834 | ||
1835 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1836 | bytenr, num_bytes, parent, | |
1837 | root_objectid, owner, offset, 1); | |
1838 | if (ret == 0) { | |
1839 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
afe5fea7 | 1840 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1841 | refs_to_add, extent_op); |
5d4f98a2 | 1842 | } else if (ret == -ENOENT) { |
fd279fae | 1843 | setup_inline_extent_backref(root, path, iref, parent, |
143bede5 JM |
1844 | root_objectid, owner, offset, |
1845 | refs_to_add, extent_op); | |
1846 | ret = 0; | |
771ed689 | 1847 | } |
5d4f98a2 YZ |
1848 | return ret; |
1849 | } | |
31840ae1 | 1850 | |
5d4f98a2 YZ |
1851 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1852 | struct btrfs_root *root, | |
1853 | struct btrfs_path *path, | |
1854 | u64 bytenr, u64 parent, u64 root_objectid, | |
1855 | u64 owner, u64 offset, int refs_to_add) | |
1856 | { | |
1857 | int ret; | |
1858 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1859 | BUG_ON(refs_to_add != 1); | |
1860 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1861 | parent, root_objectid); | |
1862 | } else { | |
1863 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1864 | parent, root_objectid, | |
1865 | owner, offset, refs_to_add); | |
1866 | } | |
1867 | return ret; | |
1868 | } | |
56bec294 | 1869 | |
5d4f98a2 YZ |
1870 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1871 | struct btrfs_root *root, | |
1872 | struct btrfs_path *path, | |
1873 | struct btrfs_extent_inline_ref *iref, | |
1874 | int refs_to_drop, int is_data) | |
1875 | { | |
143bede5 | 1876 | int ret = 0; |
b9473439 | 1877 | |
5d4f98a2 YZ |
1878 | BUG_ON(!is_data && refs_to_drop != 1); |
1879 | if (iref) { | |
afe5fea7 | 1880 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1881 | -refs_to_drop, NULL); |
5d4f98a2 YZ |
1882 | } else if (is_data) { |
1883 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1884 | } else { | |
1885 | ret = btrfs_del_item(trans, root, path); | |
1886 | } | |
1887 | return ret; | |
1888 | } | |
1889 | ||
5378e607 | 1890 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1891 | u64 start, u64 len) |
1892 | { | |
5378e607 | 1893 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1894 | } |
5d4f98a2 YZ |
1895 | |
1896 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1897 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1898 | { |
5d4f98a2 | 1899 | int ret; |
5378e607 | 1900 | u64 discarded_bytes = 0; |
a1d3c478 | 1901 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1902 | |
e244a0ae | 1903 | |
5d4f98a2 | 1904 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1905 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1906 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1907 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1908 | if (!ret) { |
a1d3c478 | 1909 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1910 | int i; |
1911 | ||
5d4f98a2 | 1912 | |
a1d3c478 | 1913 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1914 | if (!stripe->dev->can_discard) |
1915 | continue; | |
1916 | ||
5378e607 LD |
1917 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1918 | stripe->physical, | |
1919 | stripe->length); | |
1920 | if (!ret) | |
1921 | discarded_bytes += stripe->length; | |
1922 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1923 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1924 | |
1925 | /* | |
1926 | * Just in case we get back EOPNOTSUPP for some reason, | |
1927 | * just ignore the return value so we don't screw up | |
1928 | * people calling discard_extent. | |
1929 | */ | |
1930 | ret = 0; | |
5d4f98a2 | 1931 | } |
a1d3c478 | 1932 | kfree(bbio); |
5d4f98a2 | 1933 | } |
5378e607 LD |
1934 | |
1935 | if (actual_bytes) | |
1936 | *actual_bytes = discarded_bytes; | |
1937 | ||
5d4f98a2 | 1938 | |
53b381b3 DW |
1939 | if (ret == -EOPNOTSUPP) |
1940 | ret = 0; | |
5d4f98a2 | 1941 | return ret; |
5d4f98a2 YZ |
1942 | } |
1943 | ||
79787eaa | 1944 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1945 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1946 | struct btrfs_root *root, | |
1947 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1948 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1949 | { |
1950 | int ret; | |
66d7e7f0 AJ |
1951 | struct btrfs_fs_info *fs_info = root->fs_info; |
1952 | ||
5d4f98a2 YZ |
1953 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1954 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1955 | ||
1956 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1957 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1958 | num_bytes, | |
5d4f98a2 | 1959 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1960 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1961 | } else { |
66d7e7f0 AJ |
1962 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1963 | num_bytes, | |
5d4f98a2 | 1964 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1965 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1966 | } |
1967 | return ret; | |
1968 | } | |
1969 | ||
1970 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1971 | struct btrfs_root *root, | |
1972 | u64 bytenr, u64 num_bytes, | |
1973 | u64 parent, u64 root_objectid, | |
1974 | u64 owner, u64 offset, int refs_to_add, | |
1975 | struct btrfs_delayed_extent_op *extent_op) | |
1976 | { | |
1977 | struct btrfs_path *path; | |
1978 | struct extent_buffer *leaf; | |
1979 | struct btrfs_extent_item *item; | |
1980 | u64 refs; | |
1981 | int ret; | |
5d4f98a2 YZ |
1982 | |
1983 | path = btrfs_alloc_path(); | |
1984 | if (!path) | |
1985 | return -ENOMEM; | |
1986 | ||
1987 | path->reada = 1; | |
1988 | path->leave_spinning = 1; | |
1989 | /* this will setup the path even if it fails to insert the back ref */ | |
1990 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1991 | path, bytenr, num_bytes, parent, | |
1992 | root_objectid, owner, offset, | |
1993 | refs_to_add, extent_op); | |
30d133fc | 1994 | if (ret != -EAGAIN) |
5d4f98a2 YZ |
1995 | goto out; |
1996 | ||
5d4f98a2 YZ |
1997 | leaf = path->nodes[0]; |
1998 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1999 | refs = btrfs_extent_refs(leaf, item); | |
2000 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2001 | if (extent_op) | |
2002 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2003 | |
5d4f98a2 | 2004 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2005 | btrfs_release_path(path); |
56bec294 CM |
2006 | |
2007 | path->reada = 1; | |
b9473439 CM |
2008 | path->leave_spinning = 1; |
2009 | ||
56bec294 CM |
2010 | /* now insert the actual backref */ |
2011 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
2012 | path, bytenr, parent, root_objectid, |
2013 | owner, offset, refs_to_add); | |
79787eaa JM |
2014 | if (ret) |
2015 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 2016 | out: |
56bec294 | 2017 | btrfs_free_path(path); |
30d133fc | 2018 | return ret; |
56bec294 CM |
2019 | } |
2020 | ||
5d4f98a2 YZ |
2021 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2022 | struct btrfs_root *root, | |
2023 | struct btrfs_delayed_ref_node *node, | |
2024 | struct btrfs_delayed_extent_op *extent_op, | |
2025 | int insert_reserved) | |
56bec294 | 2026 | { |
5d4f98a2 YZ |
2027 | int ret = 0; |
2028 | struct btrfs_delayed_data_ref *ref; | |
2029 | struct btrfs_key ins; | |
2030 | u64 parent = 0; | |
2031 | u64 ref_root = 0; | |
2032 | u64 flags = 0; | |
2033 | ||
2034 | ins.objectid = node->bytenr; | |
2035 | ins.offset = node->num_bytes; | |
2036 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2037 | ||
2038 | ref = btrfs_delayed_node_to_data_ref(node); | |
599c75ec LB |
2039 | trace_run_delayed_data_ref(node, ref, node->action); |
2040 | ||
5d4f98a2 YZ |
2041 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2042 | parent = ref->parent; | |
2043 | else | |
2044 | ref_root = ref->root; | |
2045 | ||
2046 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2047 | if (extent_op) |
5d4f98a2 | 2048 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2049 | ret = alloc_reserved_file_extent(trans, root, |
2050 | parent, ref_root, flags, | |
2051 | ref->objectid, ref->offset, | |
2052 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
2053 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2054 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2055 | node->num_bytes, parent, | |
2056 | ref_root, ref->objectid, | |
2057 | ref->offset, node->ref_mod, | |
2058 | extent_op); | |
2059 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2060 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2061 | node->num_bytes, parent, | |
2062 | ref_root, ref->objectid, | |
2063 | ref->offset, node->ref_mod, | |
2064 | extent_op); | |
2065 | } else { | |
2066 | BUG(); | |
2067 | } | |
2068 | return ret; | |
2069 | } | |
2070 | ||
2071 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2072 | struct extent_buffer *leaf, | |
2073 | struct btrfs_extent_item *ei) | |
2074 | { | |
2075 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2076 | if (extent_op->update_flags) { | |
2077 | flags |= extent_op->flags_to_set; | |
2078 | btrfs_set_extent_flags(leaf, ei, flags); | |
2079 | } | |
2080 | ||
2081 | if (extent_op->update_key) { | |
2082 | struct btrfs_tree_block_info *bi; | |
2083 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2084 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2085 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2090 | struct btrfs_root *root, | |
2091 | struct btrfs_delayed_ref_node *node, | |
2092 | struct btrfs_delayed_extent_op *extent_op) | |
2093 | { | |
2094 | struct btrfs_key key; | |
2095 | struct btrfs_path *path; | |
2096 | struct btrfs_extent_item *ei; | |
2097 | struct extent_buffer *leaf; | |
2098 | u32 item_size; | |
56bec294 | 2099 | int ret; |
5d4f98a2 | 2100 | int err = 0; |
b1c79e09 | 2101 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2102 | |
79787eaa JM |
2103 | if (trans->aborted) |
2104 | return 0; | |
2105 | ||
3173a18f JB |
2106 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2107 | metadata = 0; | |
2108 | ||
5d4f98a2 YZ |
2109 | path = btrfs_alloc_path(); |
2110 | if (!path) | |
2111 | return -ENOMEM; | |
2112 | ||
2113 | key.objectid = node->bytenr; | |
5d4f98a2 | 2114 | |
3173a18f | 2115 | if (metadata) { |
3173a18f | 2116 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2117 | key.offset = extent_op->level; |
3173a18f JB |
2118 | } else { |
2119 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2120 | key.offset = node->num_bytes; | |
2121 | } | |
2122 | ||
2123 | again: | |
5d4f98a2 YZ |
2124 | path->reada = 1; |
2125 | path->leave_spinning = 1; | |
2126 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2127 | path, 0, 1); | |
2128 | if (ret < 0) { | |
2129 | err = ret; | |
2130 | goto out; | |
2131 | } | |
2132 | if (ret > 0) { | |
3173a18f | 2133 | if (metadata) { |
55994887 FDBM |
2134 | if (path->slots[0] > 0) { |
2135 | path->slots[0]--; | |
2136 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2137 | path->slots[0]); | |
2138 | if (key.objectid == node->bytenr && | |
2139 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
2140 | key.offset == node->num_bytes) | |
2141 | ret = 0; | |
2142 | } | |
2143 | if (ret > 0) { | |
2144 | btrfs_release_path(path); | |
2145 | metadata = 0; | |
3173a18f | 2146 | |
55994887 FDBM |
2147 | key.objectid = node->bytenr; |
2148 | key.offset = node->num_bytes; | |
2149 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2150 | goto again; | |
2151 | } | |
2152 | } else { | |
2153 | err = -EIO; | |
2154 | goto out; | |
3173a18f | 2155 | } |
5d4f98a2 YZ |
2156 | } |
2157 | ||
2158 | leaf = path->nodes[0]; | |
2159 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2160 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2161 | if (item_size < sizeof(*ei)) { | |
2162 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2163 | path, (u64)-1, 0); | |
2164 | if (ret < 0) { | |
2165 | err = ret; | |
2166 | goto out; | |
2167 | } | |
2168 | leaf = path->nodes[0]; | |
2169 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2170 | } | |
2171 | #endif | |
2172 | BUG_ON(item_size < sizeof(*ei)); | |
2173 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2174 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2175 | |
5d4f98a2 YZ |
2176 | btrfs_mark_buffer_dirty(leaf); |
2177 | out: | |
2178 | btrfs_free_path(path); | |
2179 | return err; | |
56bec294 CM |
2180 | } |
2181 | ||
5d4f98a2 YZ |
2182 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2183 | struct btrfs_root *root, | |
2184 | struct btrfs_delayed_ref_node *node, | |
2185 | struct btrfs_delayed_extent_op *extent_op, | |
2186 | int insert_reserved) | |
56bec294 CM |
2187 | { |
2188 | int ret = 0; | |
5d4f98a2 YZ |
2189 | struct btrfs_delayed_tree_ref *ref; |
2190 | struct btrfs_key ins; | |
2191 | u64 parent = 0; | |
2192 | u64 ref_root = 0; | |
3173a18f JB |
2193 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2194 | SKINNY_METADATA); | |
56bec294 | 2195 | |
5d4f98a2 | 2196 | ref = btrfs_delayed_node_to_tree_ref(node); |
599c75ec LB |
2197 | trace_run_delayed_tree_ref(node, ref, node->action); |
2198 | ||
5d4f98a2 YZ |
2199 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2200 | parent = ref->parent; | |
2201 | else | |
2202 | ref_root = ref->root; | |
2203 | ||
3173a18f JB |
2204 | ins.objectid = node->bytenr; |
2205 | if (skinny_metadata) { | |
2206 | ins.offset = ref->level; | |
2207 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2208 | } else { | |
2209 | ins.offset = node->num_bytes; | |
2210 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2211 | } | |
2212 | ||
5d4f98a2 YZ |
2213 | BUG_ON(node->ref_mod != 1); |
2214 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2215 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2216 | ret = alloc_reserved_tree_block(trans, root, |
2217 | parent, ref_root, | |
2218 | extent_op->flags_to_set, | |
2219 | &extent_op->key, | |
2220 | ref->level, &ins); | |
5d4f98a2 YZ |
2221 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2222 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2223 | node->num_bytes, parent, ref_root, | |
2224 | ref->level, 0, 1, extent_op); | |
2225 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2226 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2227 | node->num_bytes, parent, ref_root, | |
2228 | ref->level, 0, 1, extent_op); | |
2229 | } else { | |
2230 | BUG(); | |
2231 | } | |
56bec294 CM |
2232 | return ret; |
2233 | } | |
2234 | ||
2235 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2236 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2237 | struct btrfs_root *root, | |
2238 | struct btrfs_delayed_ref_node *node, | |
2239 | struct btrfs_delayed_extent_op *extent_op, | |
2240 | int insert_reserved) | |
56bec294 | 2241 | { |
79787eaa JM |
2242 | int ret = 0; |
2243 | ||
857cc2fc JB |
2244 | if (trans->aborted) { |
2245 | if (insert_reserved) | |
2246 | btrfs_pin_extent(root, node->bytenr, | |
2247 | node->num_bytes, 1); | |
79787eaa | 2248 | return 0; |
857cc2fc | 2249 | } |
79787eaa | 2250 | |
5d4f98a2 | 2251 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2252 | struct btrfs_delayed_ref_head *head; |
2253 | /* | |
2254 | * we've hit the end of the chain and we were supposed | |
2255 | * to insert this extent into the tree. But, it got | |
2256 | * deleted before we ever needed to insert it, so all | |
2257 | * we have to do is clean up the accounting | |
2258 | */ | |
5d4f98a2 YZ |
2259 | BUG_ON(extent_op); |
2260 | head = btrfs_delayed_node_to_head(node); | |
599c75ec LB |
2261 | trace_run_delayed_ref_head(node, head, node->action); |
2262 | ||
56bec294 | 2263 | if (insert_reserved) { |
f0486c68 YZ |
2264 | btrfs_pin_extent(root, node->bytenr, |
2265 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2266 | if (head->is_data) { |
2267 | ret = btrfs_del_csums(trans, root, | |
2268 | node->bytenr, | |
2269 | node->num_bytes); | |
5d4f98a2 | 2270 | } |
56bec294 | 2271 | } |
79787eaa | 2272 | return ret; |
56bec294 CM |
2273 | } |
2274 | ||
5d4f98a2 YZ |
2275 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2276 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2277 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2278 | insert_reserved); | |
2279 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2280 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2281 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2282 | insert_reserved); | |
2283 | else | |
2284 | BUG(); | |
2285 | return ret; | |
56bec294 CM |
2286 | } |
2287 | ||
2288 | static noinline struct btrfs_delayed_ref_node * | |
2289 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2290 | { | |
2291 | struct rb_node *node; | |
d7df2c79 JB |
2292 | struct btrfs_delayed_ref_node *ref, *last = NULL;; |
2293 | ||
56bec294 CM |
2294 | /* |
2295 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2296 | * this prevents ref count from going down to zero when | |
2297 | * there still are pending delayed ref. | |
2298 | */ | |
d7df2c79 JB |
2299 | node = rb_first(&head->ref_root); |
2300 | while (node) { | |
56bec294 CM |
2301 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
2302 | rb_node); | |
d7df2c79 | 2303 | if (ref->action == BTRFS_ADD_DELAYED_REF) |
56bec294 | 2304 | return ref; |
d7df2c79 JB |
2305 | else if (last == NULL) |
2306 | last = ref; | |
2307 | node = rb_next(node); | |
56bec294 | 2308 | } |
d7df2c79 | 2309 | return last; |
56bec294 CM |
2310 | } |
2311 | ||
79787eaa JM |
2312 | /* |
2313 | * Returns 0 on success or if called with an already aborted transaction. | |
2314 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2315 | */ | |
d7df2c79 JB |
2316 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
2317 | struct btrfs_root *root, | |
2318 | unsigned long nr) | |
56bec294 | 2319 | { |
56bec294 CM |
2320 | struct btrfs_delayed_ref_root *delayed_refs; |
2321 | struct btrfs_delayed_ref_node *ref; | |
2322 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2323 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2324 | struct btrfs_fs_info *fs_info = root->fs_info; |
0a2b2a84 | 2325 | ktime_t start = ktime_get(); |
56bec294 | 2326 | int ret; |
d7df2c79 | 2327 | unsigned long count = 0; |
0a2b2a84 | 2328 | unsigned long actual_count = 0; |
56bec294 | 2329 | int must_insert_reserved = 0; |
56bec294 CM |
2330 | |
2331 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2332 | while (1) { |
2333 | if (!locked_ref) { | |
d7df2c79 | 2334 | if (count >= nr) |
56bec294 | 2335 | break; |
56bec294 | 2336 | |
d7df2c79 JB |
2337 | spin_lock(&delayed_refs->lock); |
2338 | locked_ref = btrfs_select_ref_head(trans); | |
2339 | if (!locked_ref) { | |
2340 | spin_unlock(&delayed_refs->lock); | |
2341 | break; | |
2342 | } | |
c3e69d58 CM |
2343 | |
2344 | /* grab the lock that says we are going to process | |
2345 | * all the refs for this head */ | |
2346 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
d7df2c79 | 2347 | spin_unlock(&delayed_refs->lock); |
c3e69d58 CM |
2348 | /* |
2349 | * we may have dropped the spin lock to get the head | |
2350 | * mutex lock, and that might have given someone else | |
2351 | * time to free the head. If that's true, it has been | |
2352 | * removed from our list and we can move on. | |
2353 | */ | |
2354 | if (ret == -EAGAIN) { | |
2355 | locked_ref = NULL; | |
2356 | count++; | |
2357 | continue; | |
56bec294 CM |
2358 | } |
2359 | } | |
a28ec197 | 2360 | |
ae1e206b JB |
2361 | /* |
2362 | * We need to try and merge add/drops of the same ref since we | |
2363 | * can run into issues with relocate dropping the implicit ref | |
2364 | * and then it being added back again before the drop can | |
2365 | * finish. If we merged anything we need to re-loop so we can | |
2366 | * get a good ref. | |
2367 | */ | |
d7df2c79 | 2368 | spin_lock(&locked_ref->lock); |
ae1e206b JB |
2369 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, |
2370 | locked_ref); | |
2371 | ||
d1270cd9 AJ |
2372 | /* |
2373 | * locked_ref is the head node, so we have to go one | |
2374 | * node back for any delayed ref updates | |
2375 | */ | |
2376 | ref = select_delayed_ref(locked_ref); | |
2377 | ||
2378 | if (ref && ref->seq && | |
097b8a7c | 2379 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d7df2c79 | 2380 | spin_unlock(&locked_ref->lock); |
093486c4 | 2381 | btrfs_delayed_ref_unlock(locked_ref); |
d7df2c79 JB |
2382 | spin_lock(&delayed_refs->lock); |
2383 | locked_ref->processing = 0; | |
d1270cd9 AJ |
2384 | delayed_refs->num_heads_ready++; |
2385 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2386 | locked_ref = NULL; |
d1270cd9 | 2387 | cond_resched(); |
d1270cd9 AJ |
2388 | continue; |
2389 | } | |
2390 | ||
56bec294 CM |
2391 | /* |
2392 | * record the must insert reserved flag before we | |
2393 | * drop the spin lock. | |
2394 | */ | |
2395 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2396 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2397 | |
5d4f98a2 YZ |
2398 | extent_op = locked_ref->extent_op; |
2399 | locked_ref->extent_op = NULL; | |
2400 | ||
56bec294 | 2401 | if (!ref) { |
d7df2c79 JB |
2402 | |
2403 | ||
56bec294 CM |
2404 | /* All delayed refs have been processed, Go ahead |
2405 | * and send the head node to run_one_delayed_ref, | |
2406 | * so that any accounting fixes can happen | |
2407 | */ | |
2408 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2409 | |
2410 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2411 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2412 | extent_op = NULL; |
2413 | } | |
2414 | ||
2415 | if (extent_op) { | |
d7df2c79 | 2416 | spin_unlock(&locked_ref->lock); |
5d4f98a2 YZ |
2417 | ret = run_delayed_extent_op(trans, root, |
2418 | ref, extent_op); | |
78a6184a | 2419 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2420 | |
79787eaa | 2421 | if (ret) { |
857cc2fc JB |
2422 | /* |
2423 | * Need to reset must_insert_reserved if | |
2424 | * there was an error so the abort stuff | |
2425 | * can cleanup the reserved space | |
2426 | * properly. | |
2427 | */ | |
2428 | if (must_insert_reserved) | |
2429 | locked_ref->must_insert_reserved = 1; | |
d7df2c79 | 2430 | locked_ref->processing = 0; |
c2cf52eb | 2431 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
093486c4 | 2432 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2433 | return ret; |
2434 | } | |
d7df2c79 | 2435 | continue; |
5d4f98a2 | 2436 | } |
02217ed2 | 2437 | |
d7df2c79 JB |
2438 | /* |
2439 | * Need to drop our head ref lock and re-aqcuire the | |
2440 | * delayed ref lock and then re-check to make sure | |
2441 | * nobody got added. | |
2442 | */ | |
2443 | spin_unlock(&locked_ref->lock); | |
2444 | spin_lock(&delayed_refs->lock); | |
2445 | spin_lock(&locked_ref->lock); | |
2446 | if (rb_first(&locked_ref->ref_root)) { | |
2447 | spin_unlock(&locked_ref->lock); | |
2448 | spin_unlock(&delayed_refs->lock); | |
2449 | continue; | |
2450 | } | |
2451 | ref->in_tree = 0; | |
2452 | delayed_refs->num_heads--; | |
c46effa6 LB |
2453 | rb_erase(&locked_ref->href_node, |
2454 | &delayed_refs->href_root); | |
d7df2c79 JB |
2455 | spin_unlock(&delayed_refs->lock); |
2456 | } else { | |
0a2b2a84 | 2457 | actual_count++; |
d7df2c79 JB |
2458 | ref->in_tree = 0; |
2459 | rb_erase(&ref->rb_node, &locked_ref->ref_root); | |
c46effa6 | 2460 | } |
d7df2c79 JB |
2461 | atomic_dec(&delayed_refs->num_entries); |
2462 | ||
093486c4 | 2463 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2464 | /* |
2465 | * when we play the delayed ref, also correct the | |
2466 | * ref_mod on head | |
2467 | */ | |
2468 | switch (ref->action) { | |
2469 | case BTRFS_ADD_DELAYED_REF: | |
2470 | case BTRFS_ADD_DELAYED_EXTENT: | |
2471 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2472 | break; | |
2473 | case BTRFS_DROP_DELAYED_REF: | |
2474 | locked_ref->node.ref_mod += ref->ref_mod; | |
2475 | break; | |
2476 | default: | |
2477 | WARN_ON(1); | |
2478 | } | |
2479 | } | |
d7df2c79 | 2480 | spin_unlock(&locked_ref->lock); |
925baedd | 2481 | |
5d4f98a2 | 2482 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2483 | must_insert_reserved); |
eb099670 | 2484 | |
78a6184a | 2485 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2486 | if (ret) { |
d7df2c79 | 2487 | locked_ref->processing = 0; |
093486c4 MX |
2488 | btrfs_delayed_ref_unlock(locked_ref); |
2489 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2490 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
79787eaa JM |
2491 | return ret; |
2492 | } | |
2493 | ||
093486c4 MX |
2494 | /* |
2495 | * If this node is a head, that means all the refs in this head | |
2496 | * have been dealt with, and we will pick the next head to deal | |
2497 | * with, so we must unlock the head and drop it from the cluster | |
2498 | * list before we release it. | |
2499 | */ | |
2500 | if (btrfs_delayed_ref_is_head(ref)) { | |
093486c4 MX |
2501 | btrfs_delayed_ref_unlock(locked_ref); |
2502 | locked_ref = NULL; | |
2503 | } | |
2504 | btrfs_put_delayed_ref(ref); | |
2505 | count++; | |
c3e69d58 | 2506 | cond_resched(); |
c3e69d58 | 2507 | } |
0a2b2a84 JB |
2508 | |
2509 | /* | |
2510 | * We don't want to include ref heads since we can have empty ref heads | |
2511 | * and those will drastically skew our runtime down since we just do | |
2512 | * accounting, no actual extent tree updates. | |
2513 | */ | |
2514 | if (actual_count > 0) { | |
2515 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2516 | u64 avg; | |
2517 | ||
2518 | /* | |
2519 | * We weigh the current average higher than our current runtime | |
2520 | * to avoid large swings in the average. | |
2521 | */ | |
2522 | spin_lock(&delayed_refs->lock); | |
2523 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
2524 | avg = div64_u64(avg, 4); | |
2525 | fs_info->avg_delayed_ref_runtime = avg; | |
2526 | spin_unlock(&delayed_refs->lock); | |
2527 | } | |
d7df2c79 | 2528 | return 0; |
c3e69d58 CM |
2529 | } |
2530 | ||
709c0486 AJ |
2531 | #ifdef SCRAMBLE_DELAYED_REFS |
2532 | /* | |
2533 | * Normally delayed refs get processed in ascending bytenr order. This | |
2534 | * correlates in most cases to the order added. To expose dependencies on this | |
2535 | * order, we start to process the tree in the middle instead of the beginning | |
2536 | */ | |
2537 | static u64 find_middle(struct rb_root *root) | |
2538 | { | |
2539 | struct rb_node *n = root->rb_node; | |
2540 | struct btrfs_delayed_ref_node *entry; | |
2541 | int alt = 1; | |
2542 | u64 middle; | |
2543 | u64 first = 0, last = 0; | |
2544 | ||
2545 | n = rb_first(root); | |
2546 | if (n) { | |
2547 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2548 | first = entry->bytenr; | |
2549 | } | |
2550 | n = rb_last(root); | |
2551 | if (n) { | |
2552 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2553 | last = entry->bytenr; | |
2554 | } | |
2555 | n = root->rb_node; | |
2556 | ||
2557 | while (n) { | |
2558 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2559 | WARN_ON(!entry->in_tree); | |
2560 | ||
2561 | middle = entry->bytenr; | |
2562 | ||
2563 | if (alt) | |
2564 | n = n->rb_left; | |
2565 | else | |
2566 | n = n->rb_right; | |
2567 | ||
2568 | alt = 1 - alt; | |
2569 | } | |
2570 | return middle; | |
2571 | } | |
2572 | #endif | |
2573 | ||
bed92eae AJ |
2574 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2575 | struct btrfs_fs_info *fs_info) | |
2576 | { | |
2577 | struct qgroup_update *qgroup_update; | |
2578 | int ret = 0; | |
2579 | ||
2580 | if (list_empty(&trans->qgroup_ref_list) != | |
2581 | !trans->delayed_ref_elem.seq) { | |
2582 | /* list without seq or seq without list */ | |
c2cf52eb | 2583 | btrfs_err(fs_info, |
fc36ed7e | 2584 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
bed92eae | 2585 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2586 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2587 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2588 | BUG(); |
2589 | } | |
2590 | ||
2591 | if (!trans->delayed_ref_elem.seq) | |
2592 | return 0; | |
2593 | ||
2594 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2595 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2596 | struct qgroup_update, list); | |
2597 | list_del(&qgroup_update->list); | |
2598 | if (!ret) | |
2599 | ret = btrfs_qgroup_account_ref( | |
2600 | trans, fs_info, qgroup_update->node, | |
2601 | qgroup_update->extent_op); | |
2602 | kfree(qgroup_update); | |
2603 | } | |
2604 | ||
2605 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2606 | ||
2607 | return ret; | |
2608 | } | |
2609 | ||
1be41b78 JB |
2610 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
2611 | { | |
2612 | u64 num_bytes; | |
2613 | ||
2614 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2615 | sizeof(struct btrfs_extent_inline_ref)); | |
2616 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2617 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2618 | ||
2619 | /* | |
2620 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2621 | * closer to what we're really going to want to ouse. | |
2622 | */ | |
2623 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); | |
2624 | } | |
2625 | ||
0a2b2a84 | 2626 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
1be41b78 JB |
2627 | struct btrfs_root *root) |
2628 | { | |
2629 | struct btrfs_block_rsv *global_rsv; | |
2630 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
2631 | u64 num_bytes; | |
2632 | int ret = 0; | |
2633 | ||
2634 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2635 | num_heads = heads_to_leaves(root, num_heads); | |
2636 | if (num_heads > 1) | |
2637 | num_bytes += (num_heads - 1) * root->leafsize; | |
2638 | num_bytes <<= 1; | |
2639 | global_rsv = &root->fs_info->global_block_rsv; | |
2640 | ||
2641 | /* | |
2642 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2643 | * wiggle room since running delayed refs can create more delayed refs. | |
2644 | */ | |
2645 | if (global_rsv->space_info->full) | |
2646 | num_bytes <<= 1; | |
2647 | ||
2648 | spin_lock(&global_rsv->lock); | |
2649 | if (global_rsv->reserved <= num_bytes) | |
2650 | ret = 1; | |
2651 | spin_unlock(&global_rsv->lock); | |
2652 | return ret; | |
2653 | } | |
2654 | ||
0a2b2a84 JB |
2655 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
2656 | struct btrfs_root *root) | |
2657 | { | |
2658 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2659 | u64 num_entries = | |
2660 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2661 | u64 avg_runtime; | |
2662 | ||
2663 | smp_mb(); | |
2664 | avg_runtime = fs_info->avg_delayed_ref_runtime; | |
2665 | if (num_entries * avg_runtime >= NSEC_PER_SEC) | |
2666 | return 1; | |
2667 | ||
2668 | return btrfs_check_space_for_delayed_refs(trans, root); | |
2669 | } | |
2670 | ||
c3e69d58 CM |
2671 | /* |
2672 | * this starts processing the delayed reference count updates and | |
2673 | * extent insertions we have queued up so far. count can be | |
2674 | * 0, which means to process everything in the tree at the start | |
2675 | * of the run (but not newly added entries), or it can be some target | |
2676 | * number you'd like to process. | |
79787eaa JM |
2677 | * |
2678 | * Returns 0 on success or if called with an aborted transaction | |
2679 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2680 | */ |
2681 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2682 | struct btrfs_root *root, unsigned long count) | |
2683 | { | |
2684 | struct rb_node *node; | |
2685 | struct btrfs_delayed_ref_root *delayed_refs; | |
c46effa6 | 2686 | struct btrfs_delayed_ref_head *head; |
c3e69d58 CM |
2687 | int ret; |
2688 | int run_all = count == (unsigned long)-1; | |
2689 | int run_most = 0; | |
2690 | ||
79787eaa JM |
2691 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2692 | if (trans->aborted) | |
2693 | return 0; | |
2694 | ||
c3e69d58 CM |
2695 | if (root == root->fs_info->extent_root) |
2696 | root = root->fs_info->tree_root; | |
2697 | ||
edf39272 JS |
2698 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2699 | ||
c3e69d58 | 2700 | delayed_refs = &trans->transaction->delayed_refs; |
bb721703 | 2701 | if (count == 0) { |
d7df2c79 | 2702 | count = atomic_read(&delayed_refs->num_entries) * 2; |
bb721703 CM |
2703 | run_most = 1; |
2704 | } | |
2705 | ||
c3e69d58 | 2706 | again: |
709c0486 AJ |
2707 | #ifdef SCRAMBLE_DELAYED_REFS |
2708 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2709 | #endif | |
d7df2c79 JB |
2710 | ret = __btrfs_run_delayed_refs(trans, root, count); |
2711 | if (ret < 0) { | |
2712 | btrfs_abort_transaction(trans, root, ret); | |
2713 | return ret; | |
eb099670 | 2714 | } |
c3e69d58 | 2715 | |
56bec294 | 2716 | if (run_all) { |
d7df2c79 | 2717 | if (!list_empty(&trans->new_bgs)) |
ea658bad | 2718 | btrfs_create_pending_block_groups(trans, root); |
ea658bad | 2719 | |
d7df2c79 | 2720 | spin_lock(&delayed_refs->lock); |
c46effa6 | 2721 | node = rb_first(&delayed_refs->href_root); |
d7df2c79 JB |
2722 | if (!node) { |
2723 | spin_unlock(&delayed_refs->lock); | |
56bec294 | 2724 | goto out; |
d7df2c79 | 2725 | } |
c3e69d58 | 2726 | count = (unsigned long)-1; |
e9d0b13b | 2727 | |
56bec294 | 2728 | while (node) { |
c46effa6 LB |
2729 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
2730 | href_node); | |
2731 | if (btrfs_delayed_ref_is_head(&head->node)) { | |
2732 | struct btrfs_delayed_ref_node *ref; | |
5caf2a00 | 2733 | |
c46effa6 | 2734 | ref = &head->node; |
56bec294 CM |
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 | 2747 | goto again; |
c46effa6 LB |
2748 | } else { |
2749 | WARN_ON(1); | |
56bec294 CM |
2750 | } |
2751 | node = rb_next(node); | |
2752 | } | |
2753 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2754 | cond_resched(); |
56bec294 | 2755 | goto again; |
5f39d397 | 2756 | } |
54aa1f4d | 2757 | out: |
edf39272 | 2758 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2759 | return 0; |
2760 | } | |
2761 | ||
5d4f98a2 YZ |
2762 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2763 | struct btrfs_root *root, | |
2764 | u64 bytenr, u64 num_bytes, u64 flags, | |
b1c79e09 | 2765 | int level, int is_data) |
5d4f98a2 YZ |
2766 | { |
2767 | struct btrfs_delayed_extent_op *extent_op; | |
2768 | int ret; | |
2769 | ||
78a6184a | 2770 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2771 | if (!extent_op) |
2772 | return -ENOMEM; | |
2773 | ||
2774 | extent_op->flags_to_set = flags; | |
2775 | extent_op->update_flags = 1; | |
2776 | extent_op->update_key = 0; | |
2777 | extent_op->is_data = is_data ? 1 : 0; | |
b1c79e09 | 2778 | extent_op->level = level; |
5d4f98a2 | 2779 | |
66d7e7f0 AJ |
2780 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2781 | num_bytes, extent_op); | |
5d4f98a2 | 2782 | if (ret) |
78a6184a | 2783 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2784 | return ret; |
2785 | } | |
2786 | ||
2787 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2788 | struct btrfs_root *root, | |
2789 | struct btrfs_path *path, | |
2790 | u64 objectid, u64 offset, u64 bytenr) | |
2791 | { | |
2792 | struct btrfs_delayed_ref_head *head; | |
2793 | struct btrfs_delayed_ref_node *ref; | |
2794 | struct btrfs_delayed_data_ref *data_ref; | |
2795 | struct btrfs_delayed_ref_root *delayed_refs; | |
2796 | struct rb_node *node; | |
2797 | int ret = 0; | |
2798 | ||
5d4f98a2 YZ |
2799 | delayed_refs = &trans->transaction->delayed_refs; |
2800 | spin_lock(&delayed_refs->lock); | |
2801 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
d7df2c79 JB |
2802 | if (!head) { |
2803 | spin_unlock(&delayed_refs->lock); | |
2804 | return 0; | |
2805 | } | |
5d4f98a2 YZ |
2806 | |
2807 | if (!mutex_trylock(&head->mutex)) { | |
2808 | atomic_inc(&head->node.refs); | |
2809 | spin_unlock(&delayed_refs->lock); | |
2810 | ||
b3b4aa74 | 2811 | btrfs_release_path(path); |
5d4f98a2 | 2812 | |
8cc33e5c DS |
2813 | /* |
2814 | * Mutex was contended, block until it's released and let | |
2815 | * caller try again | |
2816 | */ | |
5d4f98a2 YZ |
2817 | mutex_lock(&head->mutex); |
2818 | mutex_unlock(&head->mutex); | |
2819 | btrfs_put_delayed_ref(&head->node); | |
2820 | return -EAGAIN; | |
2821 | } | |
d7df2c79 | 2822 | spin_unlock(&delayed_refs->lock); |
5d4f98a2 | 2823 | |
d7df2c79 JB |
2824 | spin_lock(&head->lock); |
2825 | node = rb_first(&head->ref_root); | |
2826 | while (node) { | |
2827 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2828 | node = rb_next(node); | |
5d4f98a2 | 2829 | |
d7df2c79 JB |
2830 | /* If it's a shared ref we know a cross reference exists */ |
2831 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
2832 | ret = 1; | |
2833 | break; | |
2834 | } | |
5d4f98a2 | 2835 | |
d7df2c79 | 2836 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
5d4f98a2 | 2837 | |
d7df2c79 JB |
2838 | /* |
2839 | * If our ref doesn't match the one we're currently looking at | |
2840 | * then we have a cross reference. | |
2841 | */ | |
2842 | if (data_ref->root != root->root_key.objectid || | |
2843 | data_ref->objectid != objectid || | |
2844 | data_ref->offset != offset) { | |
2845 | ret = 1; | |
2846 | break; | |
2847 | } | |
5d4f98a2 | 2848 | } |
d7df2c79 | 2849 | spin_unlock(&head->lock); |
5d4f98a2 | 2850 | mutex_unlock(&head->mutex); |
5d4f98a2 YZ |
2851 | return ret; |
2852 | } | |
2853 | ||
2854 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2855 | struct btrfs_root *root, | |
2856 | struct btrfs_path *path, | |
2857 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2858 | { |
2859 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2860 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2861 | struct btrfs_extent_data_ref *ref; |
2862 | struct btrfs_extent_inline_ref *iref; | |
2863 | struct btrfs_extent_item *ei; | |
f321e491 | 2864 | struct btrfs_key key; |
5d4f98a2 | 2865 | u32 item_size; |
be20aa9d | 2866 | int ret; |
925baedd | 2867 | |
be20aa9d | 2868 | key.objectid = bytenr; |
31840ae1 | 2869 | key.offset = (u64)-1; |
f321e491 | 2870 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2871 | |
be20aa9d CM |
2872 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2873 | if (ret < 0) | |
2874 | goto out; | |
79787eaa | 2875 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2876 | |
2877 | ret = -ENOENT; | |
2878 | if (path->slots[0] == 0) | |
31840ae1 | 2879 | goto out; |
be20aa9d | 2880 | |
31840ae1 | 2881 | path->slots[0]--; |
f321e491 | 2882 | leaf = path->nodes[0]; |
5d4f98a2 | 2883 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2884 | |
5d4f98a2 | 2885 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2886 | goto out; |
f321e491 | 2887 | |
5d4f98a2 YZ |
2888 | ret = 1; |
2889 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2890 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2891 | if (item_size < sizeof(*ei)) { | |
2892 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2893 | goto out; | |
2894 | } | |
2895 | #endif | |
2896 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2897 | |
5d4f98a2 YZ |
2898 | if (item_size != sizeof(*ei) + |
2899 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2900 | goto out; | |
be20aa9d | 2901 | |
5d4f98a2 YZ |
2902 | if (btrfs_extent_generation(leaf, ei) <= |
2903 | btrfs_root_last_snapshot(&root->root_item)) | |
2904 | goto out; | |
2905 | ||
2906 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2907 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2908 | BTRFS_EXTENT_DATA_REF_KEY) | |
2909 | goto out; | |
2910 | ||
2911 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2912 | if (btrfs_extent_refs(leaf, ei) != | |
2913 | btrfs_extent_data_ref_count(leaf, ref) || | |
2914 | btrfs_extent_data_ref_root(leaf, ref) != | |
2915 | root->root_key.objectid || | |
2916 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2917 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2918 | goto out; | |
2919 | ||
2920 | ret = 0; | |
2921 | out: | |
2922 | return ret; | |
2923 | } | |
2924 | ||
2925 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2926 | struct btrfs_root *root, | |
2927 | u64 objectid, u64 offset, u64 bytenr) | |
2928 | { | |
2929 | struct btrfs_path *path; | |
2930 | int ret; | |
2931 | int ret2; | |
2932 | ||
2933 | path = btrfs_alloc_path(); | |
2934 | if (!path) | |
2935 | return -ENOENT; | |
2936 | ||
2937 | do { | |
2938 | ret = check_committed_ref(trans, root, path, objectid, | |
2939 | offset, bytenr); | |
2940 | if (ret && ret != -ENOENT) | |
f321e491 | 2941 | goto out; |
80ff3856 | 2942 | |
5d4f98a2 YZ |
2943 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2944 | offset, bytenr); | |
2945 | } while (ret2 == -EAGAIN); | |
2946 | ||
2947 | if (ret2 && ret2 != -ENOENT) { | |
2948 | ret = ret2; | |
2949 | goto out; | |
f321e491 | 2950 | } |
5d4f98a2 YZ |
2951 | |
2952 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2953 | ret = 0; | |
be20aa9d | 2954 | out: |
80ff3856 | 2955 | btrfs_free_path(path); |
f0486c68 YZ |
2956 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2957 | WARN_ON(ret > 0); | |
f321e491 | 2958 | return ret; |
be20aa9d | 2959 | } |
c5739bba | 2960 | |
5d4f98a2 | 2961 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2962 | struct btrfs_root *root, |
5d4f98a2 | 2963 | struct extent_buffer *buf, |
66d7e7f0 | 2964 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2965 | { |
2966 | u64 bytenr; | |
5d4f98a2 YZ |
2967 | u64 num_bytes; |
2968 | u64 parent; | |
31840ae1 | 2969 | u64 ref_root; |
31840ae1 | 2970 | u32 nritems; |
31840ae1 ZY |
2971 | struct btrfs_key key; |
2972 | struct btrfs_file_extent_item *fi; | |
2973 | int i; | |
2974 | int level; | |
2975 | int ret = 0; | |
31840ae1 | 2976 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2977 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2978 | |
2979 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2980 | nritems = btrfs_header_nritems(buf); |
2981 | level = btrfs_header_level(buf); | |
2982 | ||
5d4f98a2 YZ |
2983 | if (!root->ref_cows && level == 0) |
2984 | return 0; | |
31840ae1 | 2985 | |
5d4f98a2 YZ |
2986 | if (inc) |
2987 | process_func = btrfs_inc_extent_ref; | |
2988 | else | |
2989 | process_func = btrfs_free_extent; | |
31840ae1 | 2990 | |
5d4f98a2 YZ |
2991 | if (full_backref) |
2992 | parent = buf->start; | |
2993 | else | |
2994 | parent = 0; | |
2995 | ||
2996 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2997 | if (level == 0) { |
5d4f98a2 | 2998 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2999 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
3000 | continue; | |
5d4f98a2 | 3001 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3002 | struct btrfs_file_extent_item); |
3003 | if (btrfs_file_extent_type(buf, fi) == | |
3004 | BTRFS_FILE_EXTENT_INLINE) | |
3005 | continue; | |
3006 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3007 | if (bytenr == 0) | |
3008 | continue; | |
5d4f98a2 YZ |
3009 | |
3010 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3011 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3012 | ret = process_func(trans, root, bytenr, num_bytes, | |
3013 | parent, ref_root, key.objectid, | |
66d7e7f0 | 3014 | key.offset, for_cow); |
31840ae1 ZY |
3015 | if (ret) |
3016 | goto fail; | |
3017 | } else { | |
5d4f98a2 YZ |
3018 | bytenr = btrfs_node_blockptr(buf, i); |
3019 | num_bytes = btrfs_level_size(root, level - 1); | |
3020 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
3021 | parent, ref_root, level - 1, 0, |
3022 | for_cow); | |
31840ae1 ZY |
3023 | if (ret) |
3024 | goto fail; | |
3025 | } | |
3026 | } | |
3027 | return 0; | |
3028 | fail: | |
5d4f98a2 YZ |
3029 | return ret; |
3030 | } | |
3031 | ||
3032 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3033 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3034 | { |
66d7e7f0 | 3035 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
3036 | } |
3037 | ||
3038 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3039 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3040 | { |
66d7e7f0 | 3041 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
3042 | } |
3043 | ||
9078a3e1 CM |
3044 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3045 | struct btrfs_root *root, | |
3046 | struct btrfs_path *path, | |
3047 | struct btrfs_block_group_cache *cache) | |
3048 | { | |
3049 | int ret; | |
9078a3e1 | 3050 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3051 | unsigned long bi; |
3052 | struct extent_buffer *leaf; | |
9078a3e1 | 3053 | |
9078a3e1 | 3054 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
3055 | if (ret < 0) |
3056 | goto fail; | |
79787eaa | 3057 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
3058 | |
3059 | leaf = path->nodes[0]; | |
3060 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3061 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3062 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3063 | btrfs_release_path(path); |
54aa1f4d | 3064 | fail: |
79787eaa JM |
3065 | if (ret) { |
3066 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 3067 | return ret; |
79787eaa | 3068 | } |
9078a3e1 CM |
3069 | return 0; |
3070 | ||
3071 | } | |
3072 | ||
4a8c9a62 YZ |
3073 | static struct btrfs_block_group_cache * |
3074 | next_block_group(struct btrfs_root *root, | |
3075 | struct btrfs_block_group_cache *cache) | |
3076 | { | |
3077 | struct rb_node *node; | |
3078 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3079 | node = rb_next(&cache->cache_node); | |
3080 | btrfs_put_block_group(cache); | |
3081 | if (node) { | |
3082 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3083 | cache_node); | |
11dfe35a | 3084 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3085 | } else |
3086 | cache = NULL; | |
3087 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3088 | return cache; | |
3089 | } | |
3090 | ||
0af3d00b JB |
3091 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3092 | struct btrfs_trans_handle *trans, | |
3093 | struct btrfs_path *path) | |
3094 | { | |
3095 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3096 | struct inode *inode = NULL; | |
3097 | u64 alloc_hint = 0; | |
2b20982e | 3098 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
3099 | int num_pages = 0; |
3100 | int retries = 0; | |
3101 | int ret = 0; | |
3102 | ||
3103 | /* | |
3104 | * If this block group is smaller than 100 megs don't bother caching the | |
3105 | * block group. | |
3106 | */ | |
3107 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3108 | spin_lock(&block_group->lock); | |
3109 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3110 | spin_unlock(&block_group->lock); | |
3111 | return 0; | |
3112 | } | |
3113 | ||
3114 | again: | |
3115 | inode = lookup_free_space_inode(root, block_group, path); | |
3116 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3117 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3118 | btrfs_release_path(path); |
0af3d00b JB |
3119 | goto out; |
3120 | } | |
3121 | ||
3122 | if (IS_ERR(inode)) { | |
3123 | BUG_ON(retries); | |
3124 | retries++; | |
3125 | ||
3126 | if (block_group->ro) | |
3127 | goto out_free; | |
3128 | ||
3129 | ret = create_free_space_inode(root, trans, block_group, path); | |
3130 | if (ret) | |
3131 | goto out_free; | |
3132 | goto again; | |
3133 | } | |
3134 | ||
5b0e95bf JB |
3135 | /* We've already setup this transaction, go ahead and exit */ |
3136 | if (block_group->cache_generation == trans->transid && | |
3137 | i_size_read(inode)) { | |
3138 | dcs = BTRFS_DC_SETUP; | |
3139 | goto out_put; | |
3140 | } | |
3141 | ||
0af3d00b JB |
3142 | /* |
3143 | * We want to set the generation to 0, that way if anything goes wrong | |
3144 | * from here on out we know not to trust this cache when we load up next | |
3145 | * time. | |
3146 | */ | |
3147 | BTRFS_I(inode)->generation = 0; | |
3148 | ret = btrfs_update_inode(trans, root, inode); | |
3149 | WARN_ON(ret); | |
3150 | ||
3151 | if (i_size_read(inode) > 0) { | |
7b61cd92 MX |
3152 | ret = btrfs_check_trunc_cache_free_space(root, |
3153 | &root->fs_info->global_block_rsv); | |
3154 | if (ret) | |
3155 | goto out_put; | |
3156 | ||
74514323 | 3157 | ret = btrfs_truncate_free_space_cache(root, trans, inode); |
0af3d00b JB |
3158 | if (ret) |
3159 | goto out_put; | |
3160 | } | |
3161 | ||
3162 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3163 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3164 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3165 | /* | |
3166 | * don't bother trying to write stuff out _if_ | |
3167 | * a) we're not cached, | |
3168 | * b) we're with nospace_cache mount option. | |
3169 | */ | |
2b20982e | 3170 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3171 | spin_unlock(&block_group->lock); |
3172 | goto out_put; | |
3173 | } | |
3174 | spin_unlock(&block_group->lock); | |
3175 | ||
6fc823b1 JB |
3176 | /* |
3177 | * Try to preallocate enough space based on how big the block group is. | |
3178 | * Keep in mind this has to include any pinned space which could end up | |
3179 | * taking up quite a bit since it's not folded into the other space | |
3180 | * cache. | |
3181 | */ | |
3182 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3183 | if (!num_pages) |
3184 | num_pages = 1; | |
3185 | ||
0af3d00b JB |
3186 | num_pages *= 16; |
3187 | num_pages *= PAGE_CACHE_SIZE; | |
3188 | ||
3189 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3190 | if (ret) | |
3191 | goto out_put; | |
3192 | ||
3193 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3194 | num_pages, num_pages, | |
3195 | &alloc_hint); | |
2b20982e JB |
3196 | if (!ret) |
3197 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3198 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3199 | |
0af3d00b JB |
3200 | out_put: |
3201 | iput(inode); | |
3202 | out_free: | |
b3b4aa74 | 3203 | btrfs_release_path(path); |
0af3d00b JB |
3204 | out: |
3205 | spin_lock(&block_group->lock); | |
e65cbb94 | 3206 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3207 | block_group->cache_generation = trans->transid; |
2b20982e | 3208 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3209 | spin_unlock(&block_group->lock); |
3210 | ||
3211 | return ret; | |
3212 | } | |
3213 | ||
96b5179d CM |
3214 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3215 | struct btrfs_root *root) | |
9078a3e1 | 3216 | { |
4a8c9a62 | 3217 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3218 | int err = 0; |
9078a3e1 | 3219 | struct btrfs_path *path; |
96b5179d | 3220 | u64 last = 0; |
9078a3e1 CM |
3221 | |
3222 | path = btrfs_alloc_path(); | |
3223 | if (!path) | |
3224 | return -ENOMEM; | |
3225 | ||
0af3d00b JB |
3226 | again: |
3227 | while (1) { | |
3228 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3229 | while (cache) { | |
3230 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3231 | break; | |
3232 | cache = next_block_group(root, cache); | |
3233 | } | |
3234 | if (!cache) { | |
3235 | if (last == 0) | |
3236 | break; | |
3237 | last = 0; | |
3238 | continue; | |
3239 | } | |
3240 | err = cache_save_setup(cache, trans, path); | |
3241 | last = cache->key.objectid + cache->key.offset; | |
3242 | btrfs_put_block_group(cache); | |
3243 | } | |
3244 | ||
d397712b | 3245 | while (1) { |
4a8c9a62 YZ |
3246 | if (last == 0) { |
3247 | err = btrfs_run_delayed_refs(trans, root, | |
3248 | (unsigned long)-1); | |
79787eaa JM |
3249 | if (err) /* File system offline */ |
3250 | goto out; | |
0f9dd46c | 3251 | } |
54aa1f4d | 3252 | |
4a8c9a62 YZ |
3253 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3254 | while (cache) { | |
0af3d00b JB |
3255 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3256 | btrfs_put_block_group(cache); | |
3257 | goto again; | |
3258 | } | |
3259 | ||
4a8c9a62 YZ |
3260 | if (cache->dirty) |
3261 | break; | |
3262 | cache = next_block_group(root, cache); | |
3263 | } | |
3264 | if (!cache) { | |
3265 | if (last == 0) | |
3266 | break; | |
3267 | last = 0; | |
3268 | continue; | |
3269 | } | |
0f9dd46c | 3270 | |
0cb59c99 JB |
3271 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3272 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3273 | cache->dirty = 0; |
4a8c9a62 | 3274 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3275 | |
4a8c9a62 | 3276 | err = write_one_cache_group(trans, root, path, cache); |
e84cc142 | 3277 | btrfs_put_block_group(cache); |
79787eaa JM |
3278 | if (err) /* File system offline */ |
3279 | goto out; | |
9078a3e1 | 3280 | } |
4a8c9a62 | 3281 | |
0cb59c99 JB |
3282 | while (1) { |
3283 | /* | |
3284 | * I don't think this is needed since we're just marking our | |
3285 | * preallocated extent as written, but just in case it can't | |
3286 | * hurt. | |
3287 | */ | |
3288 | if (last == 0) { | |
3289 | err = btrfs_run_delayed_refs(trans, root, | |
3290 | (unsigned long)-1); | |
79787eaa JM |
3291 | if (err) /* File system offline */ |
3292 | goto out; | |
0cb59c99 JB |
3293 | } |
3294 | ||
3295 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3296 | while (cache) { | |
3297 | /* | |
3298 | * Really this shouldn't happen, but it could if we | |
3299 | * couldn't write the entire preallocated extent and | |
3300 | * splitting the extent resulted in a new block. | |
3301 | */ | |
3302 | if (cache->dirty) { | |
3303 | btrfs_put_block_group(cache); | |
3304 | goto again; | |
3305 | } | |
3306 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3307 | break; | |
3308 | cache = next_block_group(root, cache); | |
3309 | } | |
3310 | if (!cache) { | |
3311 | if (last == 0) | |
3312 | break; | |
3313 | last = 0; | |
3314 | continue; | |
3315 | } | |
3316 | ||
79787eaa | 3317 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3318 | |
3319 | /* | |
3320 | * If we didn't have an error then the cache state is still | |
3321 | * NEED_WRITE, so we can set it to WRITTEN. | |
3322 | */ | |
79787eaa | 3323 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3324 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3325 | last = cache->key.objectid + cache->key.offset; | |
3326 | btrfs_put_block_group(cache); | |
3327 | } | |
79787eaa | 3328 | out: |
0cb59c99 | 3329 | |
9078a3e1 | 3330 | btrfs_free_path(path); |
79787eaa | 3331 | return err; |
9078a3e1 CM |
3332 | } |
3333 | ||
d2fb3437 YZ |
3334 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3335 | { | |
3336 | struct btrfs_block_group_cache *block_group; | |
3337 | int readonly = 0; | |
3338 | ||
3339 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3340 | if (!block_group || block_group->ro) | |
3341 | readonly = 1; | |
3342 | if (block_group) | |
fa9c0d79 | 3343 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3344 | return readonly; |
3345 | } | |
3346 | ||
6ab0a202 JM |
3347 | static const char *alloc_name(u64 flags) |
3348 | { | |
3349 | switch (flags) { | |
3350 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
3351 | return "mixed"; | |
3352 | case BTRFS_BLOCK_GROUP_METADATA: | |
3353 | return "metadata"; | |
3354 | case BTRFS_BLOCK_GROUP_DATA: | |
3355 | return "data"; | |
3356 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
3357 | return "system"; | |
3358 | default: | |
3359 | WARN_ON(1); | |
3360 | return "invalid-combination"; | |
3361 | }; | |
3362 | } | |
3363 | ||
593060d7 CM |
3364 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3365 | u64 total_bytes, u64 bytes_used, | |
3366 | struct btrfs_space_info **space_info) | |
3367 | { | |
3368 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3369 | int i; |
3370 | int factor; | |
b150a4f1 | 3371 | int ret; |
b742bb82 YZ |
3372 | |
3373 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3374 | BTRFS_BLOCK_GROUP_RAID10)) | |
3375 | factor = 2; | |
3376 | else | |
3377 | factor = 1; | |
593060d7 CM |
3378 | |
3379 | found = __find_space_info(info, flags); | |
3380 | if (found) { | |
25179201 | 3381 | spin_lock(&found->lock); |
593060d7 | 3382 | found->total_bytes += total_bytes; |
89a55897 | 3383 | found->disk_total += total_bytes * factor; |
593060d7 | 3384 | found->bytes_used += bytes_used; |
b742bb82 | 3385 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3386 | found->full = 0; |
25179201 | 3387 | spin_unlock(&found->lock); |
593060d7 CM |
3388 | *space_info = found; |
3389 | return 0; | |
3390 | } | |
c146afad | 3391 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3392 | if (!found) |
3393 | return -ENOMEM; | |
3394 | ||
b150a4f1 JB |
3395 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
3396 | if (ret) { | |
3397 | kfree(found); | |
3398 | return ret; | |
3399 | } | |
3400 | ||
536cd964 | 3401 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
b742bb82 | 3402 | INIT_LIST_HEAD(&found->block_groups[i]); |
536cd964 MX |
3403 | kobject_init(&found->block_group_kobjs[i], &btrfs_raid_ktype); |
3404 | } | |
80eb234a | 3405 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3406 | spin_lock_init(&found->lock); |
52ba6929 | 3407 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3408 | found->total_bytes = total_bytes; |
89a55897 | 3409 | found->disk_total = total_bytes * factor; |
593060d7 | 3410 | found->bytes_used = bytes_used; |
b742bb82 | 3411 | found->disk_used = bytes_used * factor; |
593060d7 | 3412 | found->bytes_pinned = 0; |
e8569813 | 3413 | found->bytes_reserved = 0; |
c146afad | 3414 | found->bytes_readonly = 0; |
f0486c68 | 3415 | found->bytes_may_use = 0; |
593060d7 | 3416 | found->full = 0; |
0e4f8f88 | 3417 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3418 | found->chunk_alloc = 0; |
fdb5effd JB |
3419 | found->flush = 0; |
3420 | init_waitqueue_head(&found->wait); | |
6ab0a202 JM |
3421 | |
3422 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, | |
3423 | info->space_info_kobj, "%s", | |
3424 | alloc_name(found->flags)); | |
3425 | if (ret) { | |
3426 | kfree(found); | |
3427 | return ret; | |
3428 | } | |
3429 | ||
593060d7 | 3430 | *space_info = found; |
4184ea7f | 3431 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3432 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3433 | info->data_sinfo = found; | |
6ab0a202 JM |
3434 | |
3435 | return ret; | |
593060d7 CM |
3436 | } |
3437 | ||
8790d502 CM |
3438 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3439 | { | |
899c81ea ID |
3440 | u64 extra_flags = chunk_to_extended(flags) & |
3441 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3442 | |
de98ced9 | 3443 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3444 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3445 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3446 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3447 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3448 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3449 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3450 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3451 | } |
593060d7 | 3452 | |
fc67c450 ID |
3453 | /* |
3454 | * returns target flags in extended format or 0 if restripe for this | |
3455 | * chunk_type is not in progress | |
c6664b42 ID |
3456 | * |
3457 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3458 | */ |
3459 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3460 | { | |
3461 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3462 | u64 target = 0; | |
3463 | ||
fc67c450 ID |
3464 | if (!bctl) |
3465 | return 0; | |
3466 | ||
3467 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3468 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3469 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3470 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3471 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3472 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3473 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3474 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3475 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3476 | } | |
3477 | ||
3478 | return target; | |
3479 | } | |
3480 | ||
a46d11a8 ID |
3481 | /* |
3482 | * @flags: available profiles in extended format (see ctree.h) | |
3483 | * | |
e4d8ec0f ID |
3484 | * Returns reduced profile in chunk format. If profile changing is in |
3485 | * progress (either running or paused) picks the target profile (if it's | |
3486 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3487 | */ |
48a3b636 | 3488 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3489 | { |
cd02dca5 CM |
3490 | /* |
3491 | * we add in the count of missing devices because we want | |
3492 | * to make sure that any RAID levels on a degraded FS | |
3493 | * continue to be honored. | |
3494 | */ | |
3495 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3496 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3497 | u64 target; |
53b381b3 | 3498 | u64 tmp; |
a061fc8d | 3499 | |
fc67c450 ID |
3500 | /* |
3501 | * see if restripe for this chunk_type is in progress, if so | |
3502 | * try to reduce to the target profile | |
3503 | */ | |
e4d8ec0f | 3504 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3505 | target = get_restripe_target(root->fs_info, flags); |
3506 | if (target) { | |
3507 | /* pick target profile only if it's already available */ | |
3508 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3509 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3510 | return extended_to_chunk(target); |
e4d8ec0f ID |
3511 | } |
3512 | } | |
3513 | spin_unlock(&root->fs_info->balance_lock); | |
3514 | ||
53b381b3 | 3515 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3516 | if (num_devices == 1) |
53b381b3 DW |
3517 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3518 | BTRFS_BLOCK_GROUP_RAID5); | |
3519 | if (num_devices < 3) | |
3520 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3521 | if (num_devices < 4) |
3522 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3523 | ||
53b381b3 DW |
3524 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3525 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3526 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3527 | flags &= ~tmp; | |
ec44a35c | 3528 | |
53b381b3 DW |
3529 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3530 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3531 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3532 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3533 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3534 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3535 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3536 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3537 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3538 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3539 | |
53b381b3 | 3540 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3541 | } |
3542 | ||
b742bb82 | 3543 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3544 | { |
de98ced9 MX |
3545 | unsigned seq; |
3546 | ||
3547 | do { | |
3548 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3549 | ||
3550 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3551 | flags |= root->fs_info->avail_data_alloc_bits; | |
3552 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3553 | flags |= root->fs_info->avail_system_alloc_bits; | |
3554 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3555 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3556 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3557 | |
b742bb82 | 3558 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3559 | } |
3560 | ||
6d07bcec | 3561 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3562 | { |
b742bb82 | 3563 | u64 flags; |
53b381b3 | 3564 | u64 ret; |
9ed74f2d | 3565 | |
b742bb82 YZ |
3566 | if (data) |
3567 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3568 | else if (root == root->fs_info->chunk_root) | |
3569 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3570 | else |
b742bb82 | 3571 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3572 | |
53b381b3 DW |
3573 | ret = get_alloc_profile(root, flags); |
3574 | return ret; | |
6a63209f | 3575 | } |
9ed74f2d | 3576 | |
6a63209f | 3577 | /* |
6a63209f JB |
3578 | * This will check the space that the inode allocates from to make sure we have |
3579 | * enough space for bytes. | |
6a63209f | 3580 | */ |
0ca1f7ce | 3581 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3582 | { |
6a63209f | 3583 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3584 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3585 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3586 | u64 used; |
0af3d00b | 3587 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3588 | |
6a63209f | 3589 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3590 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3591 | |
9dced186 | 3592 | if (btrfs_is_free_space_inode(inode)) { |
0af3d00b | 3593 | committed = 1; |
9dced186 | 3594 | ASSERT(current->journal_info); |
0af3d00b JB |
3595 | } |
3596 | ||
b4d7c3c9 | 3597 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3598 | if (!data_sinfo) |
3599 | goto alloc; | |
9ed74f2d | 3600 | |
6a63209f JB |
3601 | again: |
3602 | /* make sure we have enough space to handle the data first */ | |
3603 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3604 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3605 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3606 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3607 | |
3608 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3609 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3610 | |
6a63209f JB |
3611 | /* |
3612 | * if we don't have enough free bytes in this space then we need | |
3613 | * to alloc a new chunk. | |
3614 | */ | |
0af3d00b | 3615 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3616 | u64 alloc_target; |
9ed74f2d | 3617 | |
0e4f8f88 | 3618 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3619 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3620 | alloc: |
6a63209f | 3621 | alloc_target = btrfs_get_alloc_profile(root, 1); |
9dced186 MX |
3622 | /* |
3623 | * It is ugly that we don't call nolock join | |
3624 | * transaction for the free space inode case here. | |
3625 | * But it is safe because we only do the data space | |
3626 | * reservation for the free space cache in the | |
3627 | * transaction context, the common join transaction | |
3628 | * just increase the counter of the current transaction | |
3629 | * handler, doesn't try to acquire the trans_lock of | |
3630 | * the fs. | |
3631 | */ | |
7a7eaa40 | 3632 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3633 | if (IS_ERR(trans)) |
3634 | return PTR_ERR(trans); | |
9ed74f2d | 3635 | |
6a63209f | 3636 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3637 | alloc_target, |
3638 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3639 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3640 | if (ret < 0) { |
3641 | if (ret != -ENOSPC) | |
3642 | return ret; | |
3643 | else | |
3644 | goto commit_trans; | |
3645 | } | |
9ed74f2d | 3646 | |
b4d7c3c9 LZ |
3647 | if (!data_sinfo) |
3648 | data_sinfo = fs_info->data_sinfo; | |
3649 | ||
6a63209f JB |
3650 | goto again; |
3651 | } | |
f2bb8f5c JB |
3652 | |
3653 | /* | |
b150a4f1 JB |
3654 | * If we don't have enough pinned space to deal with this |
3655 | * allocation don't bother committing the transaction. | |
f2bb8f5c | 3656 | */ |
b150a4f1 JB |
3657 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
3658 | bytes) < 0) | |
f2bb8f5c | 3659 | committed = 1; |
6a63209f | 3660 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3661 | |
4e06bdd6 | 3662 | /* commit the current transaction and try again */ |
d52a5b5f | 3663 | commit_trans: |
a4abeea4 JB |
3664 | if (!committed && |
3665 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3666 | committed = 1; |
b150a4f1 | 3667 | |
7a7eaa40 | 3668 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3669 | if (IS_ERR(trans)) |
3670 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3671 | ret = btrfs_commit_transaction(trans, root); |
3672 | if (ret) | |
3673 | return ret; | |
3674 | goto again; | |
3675 | } | |
9ed74f2d | 3676 | |
cab45e22 JM |
3677 | trace_btrfs_space_reservation(root->fs_info, |
3678 | "space_info:enospc", | |
3679 | data_sinfo->flags, bytes, 1); | |
6a63209f JB |
3680 | return -ENOSPC; |
3681 | } | |
3682 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3683 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3684 | data_sinfo->flags, bytes, 1); |
6a63209f | 3685 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3686 | |
9ed74f2d | 3687 | return 0; |
9ed74f2d | 3688 | } |
6a63209f | 3689 | |
6a63209f | 3690 | /* |
fb25e914 | 3691 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3692 | */ |
0ca1f7ce | 3693 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3694 | { |
0ca1f7ce | 3695 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3696 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3697 | |
6a63209f | 3698 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3699 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3700 | |
b4d7c3c9 | 3701 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f | 3702 | spin_lock(&data_sinfo->lock); |
7ee9e440 | 3703 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
6a63209f | 3704 | data_sinfo->bytes_may_use -= bytes; |
8c2a3ca2 | 3705 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3706 | data_sinfo->flags, bytes, 0); |
6a63209f | 3707 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3708 | } |
3709 | ||
97e728d4 | 3710 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3711 | { |
97e728d4 JB |
3712 | struct list_head *head = &info->space_info; |
3713 | struct btrfs_space_info *found; | |
e3ccfa98 | 3714 | |
97e728d4 JB |
3715 | rcu_read_lock(); |
3716 | list_for_each_entry_rcu(found, head, list) { | |
3717 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3718 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3719 | } |
97e728d4 | 3720 | rcu_read_unlock(); |
e3ccfa98 JB |
3721 | } |
3722 | ||
3c76cd84 MX |
3723 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
3724 | { | |
3725 | return (global->size << 1); | |
3726 | } | |
3727 | ||
e5bc2458 | 3728 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3729 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3730 | { |
fb25e914 | 3731 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3732 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3733 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3734 | u64 thresh; |
e3ccfa98 | 3735 | |
0e4f8f88 CM |
3736 | if (force == CHUNK_ALLOC_FORCE) |
3737 | return 1; | |
3738 | ||
fb25e914 JB |
3739 | /* |
3740 | * We need to take into account the global rsv because for all intents | |
3741 | * and purposes it's used space. Don't worry about locking the | |
3742 | * global_rsv, it doesn't change except when the transaction commits. | |
3743 | */ | |
54338b5c | 3744 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 3745 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 3746 | |
0e4f8f88 CM |
3747 | /* |
3748 | * in limited mode, we want to have some free space up to | |
3749 | * about 1% of the FS size. | |
3750 | */ | |
3751 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3752 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3753 | thresh = max_t(u64, 64 * 1024 * 1024, |
3754 | div_factor_fine(thresh, 1)); | |
3755 | ||
3756 | if (num_bytes - num_allocated < thresh) | |
3757 | return 1; | |
3758 | } | |
0e4f8f88 | 3759 | |
698d0082 | 3760 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3761 | return 0; |
424499db | 3762 | return 1; |
32c00aff JB |
3763 | } |
3764 | ||
15d1ff81 LB |
3765 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3766 | { | |
3767 | u64 num_dev; | |
3768 | ||
53b381b3 DW |
3769 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3770 | BTRFS_BLOCK_GROUP_RAID0 | | |
3771 | BTRFS_BLOCK_GROUP_RAID5 | | |
3772 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3773 | num_dev = root->fs_info->fs_devices->rw_devices; |
3774 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3775 | num_dev = 2; | |
3776 | else | |
3777 | num_dev = 1; /* DUP or single */ | |
3778 | ||
3779 | /* metadata for updaing devices and chunk tree */ | |
3780 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3781 | } | |
3782 | ||
3783 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3784 | struct btrfs_root *root, u64 type) | |
3785 | { | |
3786 | struct btrfs_space_info *info; | |
3787 | u64 left; | |
3788 | u64 thresh; | |
3789 | ||
3790 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3791 | spin_lock(&info->lock); | |
3792 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3793 | info->bytes_reserved - info->bytes_readonly; | |
3794 | spin_unlock(&info->lock); | |
3795 | ||
3796 | thresh = get_system_chunk_thresh(root, type); | |
3797 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
c2cf52eb SK |
3798 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
3799 | left, thresh, type); | |
15d1ff81 LB |
3800 | dump_space_info(info, 0, 0); |
3801 | } | |
3802 | ||
3803 | if (left < thresh) { | |
3804 | u64 flags; | |
3805 | ||
3806 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3807 | btrfs_alloc_chunk(trans, root, flags); | |
3808 | } | |
3809 | } | |
3810 | ||
6324fbf3 | 3811 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3812 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3813 | { |
6324fbf3 | 3814 | struct btrfs_space_info *space_info; |
97e728d4 | 3815 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3816 | int wait_for_alloc = 0; |
9ed74f2d | 3817 | int ret = 0; |
9ed74f2d | 3818 | |
c6b305a8 JB |
3819 | /* Don't re-enter if we're already allocating a chunk */ |
3820 | if (trans->allocating_chunk) | |
3821 | return -ENOSPC; | |
3822 | ||
6324fbf3 | 3823 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3824 | if (!space_info) { |
3825 | ret = update_space_info(extent_root->fs_info, flags, | |
3826 | 0, 0, &space_info); | |
79787eaa | 3827 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3828 | } |
79787eaa | 3829 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3830 | |
6d74119f | 3831 | again: |
25179201 | 3832 | spin_lock(&space_info->lock); |
9e622d6b | 3833 | if (force < space_info->force_alloc) |
0e4f8f88 | 3834 | force = space_info->force_alloc; |
25179201 | 3835 | if (space_info->full) { |
09fb99a6 FDBM |
3836 | if (should_alloc_chunk(extent_root, space_info, force)) |
3837 | ret = -ENOSPC; | |
3838 | else | |
3839 | ret = 0; | |
25179201 | 3840 | spin_unlock(&space_info->lock); |
09fb99a6 | 3841 | return ret; |
9ed74f2d JB |
3842 | } |
3843 | ||
698d0082 | 3844 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3845 | spin_unlock(&space_info->lock); |
6d74119f JB |
3846 | return 0; |
3847 | } else if (space_info->chunk_alloc) { | |
3848 | wait_for_alloc = 1; | |
3849 | } else { | |
3850 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3851 | } |
0e4f8f88 | 3852 | |
25179201 | 3853 | spin_unlock(&space_info->lock); |
9ed74f2d | 3854 | |
6d74119f JB |
3855 | mutex_lock(&fs_info->chunk_mutex); |
3856 | ||
3857 | /* | |
3858 | * The chunk_mutex is held throughout the entirety of a chunk | |
3859 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3860 | * other guy is done and we need to recheck and see if we should | |
3861 | * allocate. | |
3862 | */ | |
3863 | if (wait_for_alloc) { | |
3864 | mutex_unlock(&fs_info->chunk_mutex); | |
3865 | wait_for_alloc = 0; | |
3866 | goto again; | |
3867 | } | |
3868 | ||
c6b305a8 JB |
3869 | trans->allocating_chunk = true; |
3870 | ||
67377734 JB |
3871 | /* |
3872 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3873 | * allocating mixed chunks instead of individual chunks. | |
3874 | */ | |
3875 | if (btrfs_mixed_space_info(space_info)) | |
3876 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3877 | ||
97e728d4 JB |
3878 | /* |
3879 | * if we're doing a data chunk, go ahead and make sure that | |
3880 | * we keep a reasonable number of metadata chunks allocated in the | |
3881 | * FS as well. | |
3882 | */ | |
9ed74f2d | 3883 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3884 | fs_info->data_chunk_allocations++; |
3885 | if (!(fs_info->data_chunk_allocations % | |
3886 | fs_info->metadata_ratio)) | |
3887 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3888 | } |
3889 | ||
15d1ff81 LB |
3890 | /* |
3891 | * Check if we have enough space in SYSTEM chunk because we may need | |
3892 | * to update devices. | |
3893 | */ | |
3894 | check_system_chunk(trans, extent_root, flags); | |
3895 | ||
2b82032c | 3896 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3897 | trans->allocating_chunk = false; |
92b8e897 | 3898 | |
9ed74f2d | 3899 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3900 | if (ret < 0 && ret != -ENOSPC) |
3901 | goto out; | |
9ed74f2d | 3902 | if (ret) |
6324fbf3 | 3903 | space_info->full = 1; |
424499db YZ |
3904 | else |
3905 | ret = 1; | |
6d74119f | 3906 | |
0e4f8f88 | 3907 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3908 | out: |
6d74119f | 3909 | space_info->chunk_alloc = 0; |
9ed74f2d | 3910 | spin_unlock(&space_info->lock); |
a25c75d5 | 3911 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3912 | return ret; |
6324fbf3 | 3913 | } |
9ed74f2d | 3914 | |
a80c8dcf JB |
3915 | static int can_overcommit(struct btrfs_root *root, |
3916 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3917 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3918 | { |
96f1bb57 | 3919 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3920 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 3921 | u64 space_size; |
a80c8dcf JB |
3922 | u64 avail; |
3923 | u64 used; | |
3924 | ||
3925 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3926 | space_info->bytes_pinned + space_info->bytes_readonly; |
3927 | ||
96f1bb57 JB |
3928 | /* |
3929 | * We only want to allow over committing if we have lots of actual space | |
3930 | * free, but if we don't have enough space to handle the global reserve | |
3931 | * space then we could end up having a real enospc problem when trying | |
3932 | * to allocate a chunk or some other such important allocation. | |
3933 | */ | |
3c76cd84 MX |
3934 | spin_lock(&global_rsv->lock); |
3935 | space_size = calc_global_rsv_need_space(global_rsv); | |
3936 | spin_unlock(&global_rsv->lock); | |
3937 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
3938 | return 0; |
3939 | ||
3940 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3941 | |
3942 | spin_lock(&root->fs_info->free_chunk_lock); | |
3943 | avail = root->fs_info->free_chunk_space; | |
3944 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3945 | ||
3946 | /* | |
3947 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
3948 | * space is actually useable. For raid56, the space info used |
3949 | * doesn't include the parity drive, so we don't have to | |
3950 | * change the math | |
a80c8dcf JB |
3951 | */ |
3952 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3953 | BTRFS_BLOCK_GROUP_RAID1 | | |
3954 | BTRFS_BLOCK_GROUP_RAID10)) | |
3955 | avail >>= 1; | |
3956 | ||
3957 | /* | |
561c294d MX |
3958 | * If we aren't flushing all things, let us overcommit up to |
3959 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3960 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3961 | */ |
08e007d2 | 3962 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
14575aef | 3963 | avail >>= 3; |
a80c8dcf | 3964 | else |
14575aef | 3965 | avail >>= 1; |
a80c8dcf | 3966 | |
14575aef | 3967 | if (used + bytes < space_info->total_bytes + avail) |
a80c8dcf JB |
3968 | return 1; |
3969 | return 0; | |
3970 | } | |
3971 | ||
48a3b636 ES |
3972 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3973 | unsigned long nr_pages) | |
da633a42 MX |
3974 | { |
3975 | struct super_block *sb = root->fs_info->sb; | |
da633a42 | 3976 | |
925a6efb JB |
3977 | if (down_read_trylock(&sb->s_umount)) { |
3978 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
3979 | up_read(&sb->s_umount); | |
3980 | } else { | |
da633a42 MX |
3981 | /* |
3982 | * We needn't worry the filesystem going from r/w to r/o though | |
3983 | * we don't acquire ->s_umount mutex, because the filesystem | |
3984 | * should guarantee the delalloc inodes list be empty after | |
3985 | * the filesystem is readonly(all dirty pages are written to | |
3986 | * the disk). | |
3987 | */ | |
91aef86f | 3988 | btrfs_start_delalloc_roots(root->fs_info, 0); |
98ad69cf | 3989 | if (!current->journal_info) |
b0244199 | 3990 | btrfs_wait_ordered_roots(root->fs_info, -1); |
da633a42 MX |
3991 | } |
3992 | } | |
3993 | ||
18cd8ea6 MX |
3994 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) |
3995 | { | |
3996 | u64 bytes; | |
3997 | int nr; | |
3998 | ||
3999 | bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4000 | nr = (int)div64_u64(to_reclaim, bytes); | |
4001 | if (!nr) | |
4002 | nr = 1; | |
4003 | return nr; | |
4004 | } | |
4005 | ||
c61a16a7 MX |
4006 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) |
4007 | ||
9ed74f2d | 4008 | /* |
5da9d01b | 4009 | * shrink metadata reservation for delalloc |
9ed74f2d | 4010 | */ |
f4c738c2 JB |
4011 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
4012 | bool wait_ordered) | |
5da9d01b | 4013 | { |
0ca1f7ce | 4014 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 4015 | struct btrfs_space_info *space_info; |
663350ac | 4016 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4017 | u64 delalloc_bytes; |
5da9d01b | 4018 | u64 max_reclaim; |
b1953bce | 4019 | long time_left; |
d3ee29e3 MX |
4020 | unsigned long nr_pages; |
4021 | int loops; | |
b0244199 | 4022 | int items; |
08e007d2 | 4023 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 4024 | |
c61a16a7 | 4025 | /* Calc the number of the pages we need flush for space reservation */ |
b0244199 MX |
4026 | items = calc_reclaim_items_nr(root, to_reclaim); |
4027 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; | |
c61a16a7 | 4028 | |
663350ac | 4029 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 4030 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 4031 | space_info = block_rsv->space_info; |
bf9022e0 | 4032 | |
963d678b MX |
4033 | delalloc_bytes = percpu_counter_sum_positive( |
4034 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 4035 | if (delalloc_bytes == 0) { |
fdb5effd | 4036 | if (trans) |
f4c738c2 | 4037 | return; |
38c135af | 4038 | if (wait_ordered) |
b0244199 | 4039 | btrfs_wait_ordered_roots(root->fs_info, items); |
f4c738c2 | 4040 | return; |
fdb5effd JB |
4041 | } |
4042 | ||
d3ee29e3 | 4043 | loops = 0; |
f4c738c2 JB |
4044 | while (delalloc_bytes && loops < 3) { |
4045 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
4046 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 4047 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
4048 | /* |
4049 | * We need to wait for the async pages to actually start before | |
4050 | * we do anything. | |
4051 | */ | |
9f3a074d MX |
4052 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); |
4053 | if (!max_reclaim) | |
4054 | goto skip_async; | |
4055 | ||
4056 | if (max_reclaim <= nr_pages) | |
4057 | max_reclaim = 0; | |
4058 | else | |
4059 | max_reclaim -= nr_pages; | |
dea31f52 | 4060 | |
9f3a074d MX |
4061 | wait_event(root->fs_info->async_submit_wait, |
4062 | atomic_read(&root->fs_info->async_delalloc_pages) <= | |
4063 | (int)max_reclaim); | |
4064 | skip_async: | |
08e007d2 MX |
4065 | if (!trans) |
4066 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4067 | else | |
4068 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 4069 | spin_lock(&space_info->lock); |
08e007d2 | 4070 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4071 | spin_unlock(&space_info->lock); |
4072 | break; | |
4073 | } | |
0019f10d | 4074 | spin_unlock(&space_info->lock); |
5da9d01b | 4075 | |
36e39c40 | 4076 | loops++; |
f104d044 | 4077 | if (wait_ordered && !trans) { |
b0244199 | 4078 | btrfs_wait_ordered_roots(root->fs_info, items); |
f104d044 | 4079 | } else { |
f4c738c2 | 4080 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4081 | if (time_left) |
4082 | break; | |
4083 | } | |
963d678b MX |
4084 | delalloc_bytes = percpu_counter_sum_positive( |
4085 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4086 | } |
5da9d01b YZ |
4087 | } |
4088 | ||
663350ac JB |
4089 | /** |
4090 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4091 | * @root - the root we're allocating for | |
4092 | * @bytes - the number of bytes we want to reserve | |
4093 | * @force - force the commit | |
8bb8ab2e | 4094 | * |
663350ac JB |
4095 | * This will check to make sure that committing the transaction will actually |
4096 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4097 | * will return -ENOSPC. | |
8bb8ab2e | 4098 | */ |
663350ac JB |
4099 | static int may_commit_transaction(struct btrfs_root *root, |
4100 | struct btrfs_space_info *space_info, | |
4101 | u64 bytes, int force) | |
4102 | { | |
4103 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4104 | struct btrfs_trans_handle *trans; | |
4105 | ||
4106 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4107 | if (trans) | |
4108 | return -EAGAIN; | |
4109 | ||
4110 | if (force) | |
4111 | goto commit; | |
4112 | ||
4113 | /* See if there is enough pinned space to make this reservation */ | |
4114 | spin_lock(&space_info->lock); | |
b150a4f1 JB |
4115 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4116 | bytes) >= 0) { | |
663350ac JB |
4117 | spin_unlock(&space_info->lock); |
4118 | goto commit; | |
4119 | } | |
4120 | spin_unlock(&space_info->lock); | |
4121 | ||
4122 | /* | |
4123 | * See if there is some space in the delayed insertion reservation for | |
4124 | * this reservation. | |
4125 | */ | |
4126 | if (space_info != delayed_rsv->space_info) | |
4127 | return -ENOSPC; | |
4128 | ||
d9b0218f | 4129 | spin_lock(&space_info->lock); |
663350ac | 4130 | spin_lock(&delayed_rsv->lock); |
b150a4f1 JB |
4131 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4132 | bytes - delayed_rsv->size) >= 0) { | |
663350ac | 4133 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 4134 | spin_unlock(&space_info->lock); |
663350ac JB |
4135 | return -ENOSPC; |
4136 | } | |
4137 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 4138 | spin_unlock(&space_info->lock); |
663350ac JB |
4139 | |
4140 | commit: | |
4141 | trans = btrfs_join_transaction(root); | |
4142 | if (IS_ERR(trans)) | |
4143 | return -ENOSPC; | |
4144 | ||
4145 | return btrfs_commit_transaction(trans, root); | |
4146 | } | |
4147 | ||
96c3f433 | 4148 | enum flush_state { |
67b0fd63 JB |
4149 | FLUSH_DELAYED_ITEMS_NR = 1, |
4150 | FLUSH_DELAYED_ITEMS = 2, | |
4151 | FLUSH_DELALLOC = 3, | |
4152 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4153 | ALLOC_CHUNK = 5, |
4154 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4155 | }; |
4156 | ||
4157 | static int flush_space(struct btrfs_root *root, | |
4158 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4159 | u64 orig_bytes, int state) | |
4160 | { | |
4161 | struct btrfs_trans_handle *trans; | |
4162 | int nr; | |
f4c738c2 | 4163 | int ret = 0; |
96c3f433 JB |
4164 | |
4165 | switch (state) { | |
96c3f433 JB |
4166 | case FLUSH_DELAYED_ITEMS_NR: |
4167 | case FLUSH_DELAYED_ITEMS: | |
18cd8ea6 MX |
4168 | if (state == FLUSH_DELAYED_ITEMS_NR) |
4169 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; | |
4170 | else | |
96c3f433 | 4171 | nr = -1; |
18cd8ea6 | 4172 | |
96c3f433 JB |
4173 | trans = btrfs_join_transaction(root); |
4174 | if (IS_ERR(trans)) { | |
4175 | ret = PTR_ERR(trans); | |
4176 | break; | |
4177 | } | |
4178 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4179 | btrfs_end_transaction(trans, root); | |
4180 | break; | |
67b0fd63 JB |
4181 | case FLUSH_DELALLOC: |
4182 | case FLUSH_DELALLOC_WAIT: | |
4183 | shrink_delalloc(root, num_bytes, orig_bytes, | |
4184 | state == FLUSH_DELALLOC_WAIT); | |
4185 | break; | |
ea658bad JB |
4186 | case ALLOC_CHUNK: |
4187 | trans = btrfs_join_transaction(root); | |
4188 | if (IS_ERR(trans)) { | |
4189 | ret = PTR_ERR(trans); | |
4190 | break; | |
4191 | } | |
4192 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4193 | btrfs_get_alloc_profile(root, 0), |
4194 | CHUNK_ALLOC_NO_FORCE); | |
4195 | btrfs_end_transaction(trans, root); | |
4196 | if (ret == -ENOSPC) | |
4197 | ret = 0; | |
4198 | break; | |
96c3f433 JB |
4199 | case COMMIT_TRANS: |
4200 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4201 | break; | |
4202 | default: | |
4203 | ret = -ENOSPC; | |
4204 | break; | |
4205 | } | |
4206 | ||
4207 | return ret; | |
4208 | } | |
4a92b1b8 JB |
4209 | /** |
4210 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4211 | * @root - the root we're allocating for | |
4212 | * @block_rsv - the block_rsv we're allocating for | |
4213 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4214 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4215 | * |
4a92b1b8 JB |
4216 | * This will reserve orgi_bytes number of bytes from the space info associated |
4217 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4218 | * flush out space to make room. It will do this by flushing delalloc if | |
4219 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4220 | * regain reservations will be made and this will fail if there is not enough | |
4221 | * space already. | |
8bb8ab2e | 4222 | */ |
4a92b1b8 | 4223 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4224 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4225 | u64 orig_bytes, |
4226 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4227 | { |
f0486c68 | 4228 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4229 | u64 used; |
8bb8ab2e | 4230 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4231 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4232 | int ret = 0; |
fdb5effd | 4233 | bool flushing = false; |
9ed74f2d | 4234 | |
8bb8ab2e | 4235 | again: |
fdb5effd | 4236 | ret = 0; |
8bb8ab2e | 4237 | spin_lock(&space_info->lock); |
fdb5effd | 4238 | /* |
08e007d2 MX |
4239 | * We only want to wait if somebody other than us is flushing and we |
4240 | * are actually allowed to flush all things. | |
fdb5effd | 4241 | */ |
08e007d2 MX |
4242 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4243 | space_info->flush) { | |
fdb5effd JB |
4244 | spin_unlock(&space_info->lock); |
4245 | /* | |
4246 | * If we have a trans handle we can't wait because the flusher | |
4247 | * may have to commit the transaction, which would mean we would | |
4248 | * deadlock since we are waiting for the flusher to finish, but | |
4249 | * hold the current transaction open. | |
4250 | */ | |
663350ac | 4251 | if (current->journal_info) |
fdb5effd | 4252 | return -EAGAIN; |
b9688bb8 AJ |
4253 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4254 | /* Must have been killed, return */ | |
4255 | if (ret) | |
fdb5effd JB |
4256 | return -EINTR; |
4257 | ||
4258 | spin_lock(&space_info->lock); | |
4259 | } | |
4260 | ||
4261 | ret = -ENOSPC; | |
2bf64758 JB |
4262 | used = space_info->bytes_used + space_info->bytes_reserved + |
4263 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4264 | space_info->bytes_may_use; | |
9ed74f2d | 4265 | |
8bb8ab2e JB |
4266 | /* |
4267 | * The idea here is that we've not already over-reserved the block group | |
4268 | * then we can go ahead and save our reservation first and then start | |
4269 | * flushing if we need to. Otherwise if we've already overcommitted | |
4270 | * lets start flushing stuff first and then come back and try to make | |
4271 | * our reservation. | |
4272 | */ | |
2bf64758 JB |
4273 | if (used <= space_info->total_bytes) { |
4274 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4275 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4276 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4277 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4278 | ret = 0; |
4279 | } else { | |
4280 | /* | |
4281 | * Ok set num_bytes to orig_bytes since we aren't | |
4282 | * overocmmitted, this way we only try and reclaim what | |
4283 | * we need. | |
4284 | */ | |
4285 | num_bytes = orig_bytes; | |
4286 | } | |
4287 | } else { | |
4288 | /* | |
4289 | * Ok we're over committed, set num_bytes to the overcommitted | |
4290 | * amount plus the amount of bytes that we need for this | |
4291 | * reservation. | |
4292 | */ | |
2bf64758 | 4293 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4294 | (orig_bytes * 2); |
8bb8ab2e | 4295 | } |
9ed74f2d | 4296 | |
44734ed1 JB |
4297 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4298 | space_info->bytes_may_use += orig_bytes; | |
4299 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4300 | space_info->flags, orig_bytes, | |
4301 | 1); | |
4302 | ret = 0; | |
2bf64758 JB |
4303 | } |
4304 | ||
8bb8ab2e JB |
4305 | /* |
4306 | * Couldn't make our reservation, save our place so while we're trying | |
4307 | * to reclaim space we can actually use it instead of somebody else | |
4308 | * stealing it from us. | |
08e007d2 MX |
4309 | * |
4310 | * We make the other tasks wait for the flush only when we can flush | |
4311 | * all things. | |
8bb8ab2e | 4312 | */ |
72bcd99d | 4313 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4314 | flushing = true; |
4315 | space_info->flush = 1; | |
8bb8ab2e | 4316 | } |
9ed74f2d | 4317 | |
f0486c68 | 4318 | spin_unlock(&space_info->lock); |
9ed74f2d | 4319 | |
08e007d2 | 4320 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4321 | goto out; |
f0486c68 | 4322 | |
96c3f433 JB |
4323 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4324 | flush_state); | |
4325 | flush_state++; | |
08e007d2 MX |
4326 | |
4327 | /* | |
4328 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4329 | * would happen. So skip delalloc flush. | |
4330 | */ | |
4331 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4332 | (flush_state == FLUSH_DELALLOC || | |
4333 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4334 | flush_state = ALLOC_CHUNK; | |
4335 | ||
96c3f433 | 4336 | if (!ret) |
8bb8ab2e | 4337 | goto again; |
08e007d2 MX |
4338 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4339 | flush_state < COMMIT_TRANS) | |
4340 | goto again; | |
4341 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4342 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4343 | goto again; |
4344 | ||
4345 | out: | |
5d80366e JB |
4346 | if (ret == -ENOSPC && |
4347 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4348 | struct btrfs_block_rsv *global_rsv = | |
4349 | &root->fs_info->global_block_rsv; | |
4350 | ||
4351 | if (block_rsv != global_rsv && | |
4352 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4353 | ret = 0; | |
4354 | } | |
cab45e22 JM |
4355 | if (ret == -ENOSPC) |
4356 | trace_btrfs_space_reservation(root->fs_info, | |
4357 | "space_info:enospc", | |
4358 | space_info->flags, orig_bytes, 1); | |
fdb5effd | 4359 | if (flushing) { |
8bb8ab2e | 4360 | spin_lock(&space_info->lock); |
fdb5effd JB |
4361 | space_info->flush = 0; |
4362 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4363 | spin_unlock(&space_info->lock); |
f0486c68 | 4364 | } |
f0486c68 YZ |
4365 | return ret; |
4366 | } | |
4367 | ||
79787eaa JM |
4368 | static struct btrfs_block_rsv *get_block_rsv( |
4369 | const struct btrfs_trans_handle *trans, | |
4370 | const struct btrfs_root *root) | |
f0486c68 | 4371 | { |
4c13d758 JB |
4372 | struct btrfs_block_rsv *block_rsv = NULL; |
4373 | ||
0e721106 JB |
4374 | if (root->ref_cows) |
4375 | block_rsv = trans->block_rsv; | |
4376 | ||
4377 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4378 | block_rsv = trans->block_rsv; |
4c13d758 | 4379 | |
f7a81ea4 SB |
4380 | if (root == root->fs_info->uuid_root) |
4381 | block_rsv = trans->block_rsv; | |
4382 | ||
4c13d758 | 4383 | if (!block_rsv) |
f0486c68 YZ |
4384 | block_rsv = root->block_rsv; |
4385 | ||
4386 | if (!block_rsv) | |
4387 | block_rsv = &root->fs_info->empty_block_rsv; | |
4388 | ||
4389 | return block_rsv; | |
4390 | } | |
4391 | ||
4392 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4393 | u64 num_bytes) | |
4394 | { | |
4395 | int ret = -ENOSPC; | |
4396 | spin_lock(&block_rsv->lock); | |
4397 | if (block_rsv->reserved >= num_bytes) { | |
4398 | block_rsv->reserved -= num_bytes; | |
4399 | if (block_rsv->reserved < block_rsv->size) | |
4400 | block_rsv->full = 0; | |
4401 | ret = 0; | |
4402 | } | |
4403 | spin_unlock(&block_rsv->lock); | |
4404 | return ret; | |
4405 | } | |
4406 | ||
4407 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4408 | u64 num_bytes, int update_size) | |
4409 | { | |
4410 | spin_lock(&block_rsv->lock); | |
4411 | block_rsv->reserved += num_bytes; | |
4412 | if (update_size) | |
4413 | block_rsv->size += num_bytes; | |
4414 | else if (block_rsv->reserved >= block_rsv->size) | |
4415 | block_rsv->full = 1; | |
4416 | spin_unlock(&block_rsv->lock); | |
4417 | } | |
4418 | ||
d52be818 JB |
4419 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
4420 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4421 | int min_factor) | |
4422 | { | |
4423 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4424 | u64 min_bytes; | |
4425 | ||
4426 | if (global_rsv->space_info != dest->space_info) | |
4427 | return -ENOSPC; | |
4428 | ||
4429 | spin_lock(&global_rsv->lock); | |
4430 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4431 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4432 | spin_unlock(&global_rsv->lock); | |
4433 | return -ENOSPC; | |
4434 | } | |
4435 | global_rsv->reserved -= num_bytes; | |
4436 | if (global_rsv->reserved < global_rsv->size) | |
4437 | global_rsv->full = 0; | |
4438 | spin_unlock(&global_rsv->lock); | |
4439 | ||
4440 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4441 | return 0; | |
4442 | } | |
4443 | ||
8c2a3ca2 JB |
4444 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4445 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4446 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4447 | { |
4448 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4449 | ||
4450 | spin_lock(&block_rsv->lock); | |
4451 | if (num_bytes == (u64)-1) | |
4452 | num_bytes = block_rsv->size; | |
4453 | block_rsv->size -= num_bytes; | |
4454 | if (block_rsv->reserved >= block_rsv->size) { | |
4455 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4456 | block_rsv->reserved = block_rsv->size; | |
4457 | block_rsv->full = 1; | |
4458 | } else { | |
4459 | num_bytes = 0; | |
4460 | } | |
4461 | spin_unlock(&block_rsv->lock); | |
4462 | ||
4463 | if (num_bytes > 0) { | |
4464 | if (dest) { | |
e9e22899 JB |
4465 | spin_lock(&dest->lock); |
4466 | if (!dest->full) { | |
4467 | u64 bytes_to_add; | |
4468 | ||
4469 | bytes_to_add = dest->size - dest->reserved; | |
4470 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4471 | dest->reserved += bytes_to_add; | |
4472 | if (dest->reserved >= dest->size) | |
4473 | dest->full = 1; | |
4474 | num_bytes -= bytes_to_add; | |
4475 | } | |
4476 | spin_unlock(&dest->lock); | |
4477 | } | |
4478 | if (num_bytes) { | |
f0486c68 | 4479 | spin_lock(&space_info->lock); |
fb25e914 | 4480 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4481 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4482 | space_info->flags, num_bytes, 0); |
f0486c68 | 4483 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4484 | } |
9ed74f2d | 4485 | } |
f0486c68 | 4486 | } |
4e06bdd6 | 4487 | |
f0486c68 YZ |
4488 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4489 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4490 | { | |
4491 | int ret; | |
9ed74f2d | 4492 | |
f0486c68 YZ |
4493 | ret = block_rsv_use_bytes(src, num_bytes); |
4494 | if (ret) | |
4495 | return ret; | |
9ed74f2d | 4496 | |
f0486c68 | 4497 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4498 | return 0; |
4499 | } | |
4500 | ||
66d8f3dd | 4501 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4502 | { |
f0486c68 YZ |
4503 | memset(rsv, 0, sizeof(*rsv)); |
4504 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4505 | rsv->type = type; |
f0486c68 YZ |
4506 | } |
4507 | ||
66d8f3dd MX |
4508 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4509 | unsigned short type) | |
f0486c68 YZ |
4510 | { |
4511 | struct btrfs_block_rsv *block_rsv; | |
4512 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4513 | |
f0486c68 YZ |
4514 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4515 | if (!block_rsv) | |
4516 | return NULL; | |
9ed74f2d | 4517 | |
66d8f3dd | 4518 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4519 | block_rsv->space_info = __find_space_info(fs_info, |
4520 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4521 | return block_rsv; |
4522 | } | |
9ed74f2d | 4523 | |
f0486c68 YZ |
4524 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4525 | struct btrfs_block_rsv *rsv) | |
4526 | { | |
2aaa6655 JB |
4527 | if (!rsv) |
4528 | return; | |
dabdb640 JB |
4529 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4530 | kfree(rsv); | |
9ed74f2d JB |
4531 | } |
4532 | ||
08e007d2 MX |
4533 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4534 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4535 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4536 | { |
f0486c68 | 4537 | int ret; |
9ed74f2d | 4538 | |
f0486c68 YZ |
4539 | if (num_bytes == 0) |
4540 | return 0; | |
8bb8ab2e | 4541 | |
61b520a9 | 4542 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4543 | if (!ret) { |
4544 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4545 | return 0; | |
4546 | } | |
9ed74f2d | 4547 | |
f0486c68 | 4548 | return ret; |
f0486c68 | 4549 | } |
9ed74f2d | 4550 | |
4a92b1b8 | 4551 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4552 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4553 | { |
4554 | u64 num_bytes = 0; | |
f0486c68 | 4555 | int ret = -ENOSPC; |
9ed74f2d | 4556 | |
f0486c68 YZ |
4557 | if (!block_rsv) |
4558 | return 0; | |
9ed74f2d | 4559 | |
f0486c68 | 4560 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4561 | num_bytes = div_factor(block_rsv->size, min_factor); |
4562 | if (block_rsv->reserved >= num_bytes) | |
4563 | ret = 0; | |
4564 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4565 | |
36ba022a JB |
4566 | return ret; |
4567 | } | |
4568 | ||
08e007d2 MX |
4569 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4570 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4571 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4572 | { |
4573 | u64 num_bytes = 0; | |
4574 | int ret = -ENOSPC; | |
4575 | ||
4576 | if (!block_rsv) | |
4577 | return 0; | |
4578 | ||
4579 | spin_lock(&block_rsv->lock); | |
4580 | num_bytes = min_reserved; | |
13553e52 | 4581 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4582 | ret = 0; |
13553e52 | 4583 | else |
f0486c68 | 4584 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4585 | spin_unlock(&block_rsv->lock); |
13553e52 | 4586 | |
f0486c68 YZ |
4587 | if (!ret) |
4588 | return 0; | |
4589 | ||
aa38a711 | 4590 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4591 | if (!ret) { |
4592 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4593 | return 0; |
6a63209f | 4594 | } |
9ed74f2d | 4595 | |
13553e52 | 4596 | return ret; |
f0486c68 YZ |
4597 | } |
4598 | ||
4599 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4600 | struct btrfs_block_rsv *dst_rsv, | |
4601 | u64 num_bytes) | |
4602 | { | |
4603 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4604 | } | |
4605 | ||
4606 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4607 | struct btrfs_block_rsv *block_rsv, | |
4608 | u64 num_bytes) | |
4609 | { | |
4610 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
17504584 | 4611 | if (global_rsv == block_rsv || |
f0486c68 YZ |
4612 | block_rsv->space_info != global_rsv->space_info) |
4613 | global_rsv = NULL; | |
8c2a3ca2 JB |
4614 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4615 | num_bytes); | |
6a63209f JB |
4616 | } |
4617 | ||
4618 | /* | |
8929ecfa YZ |
4619 | * helper to calculate size of global block reservation. |
4620 | * the desired value is sum of space used by extent tree, | |
4621 | * checksum tree and root tree | |
6a63209f | 4622 | */ |
8929ecfa | 4623 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4624 | { |
8929ecfa YZ |
4625 | struct btrfs_space_info *sinfo; |
4626 | u64 num_bytes; | |
4627 | u64 meta_used; | |
4628 | u64 data_used; | |
6c41761f | 4629 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4630 | |
8929ecfa YZ |
4631 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4632 | spin_lock(&sinfo->lock); | |
4633 | data_used = sinfo->bytes_used; | |
4634 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4635 | |
8929ecfa YZ |
4636 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4637 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4638 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4639 | data_used = 0; | |
8929ecfa YZ |
4640 | meta_used = sinfo->bytes_used; |
4641 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4642 | |
8929ecfa YZ |
4643 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4644 | csum_size * 2; | |
4645 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4646 | |
8929ecfa | 4647 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4648 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4649 | |
8929ecfa YZ |
4650 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4651 | } | |
6a63209f | 4652 | |
8929ecfa YZ |
4653 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4654 | { | |
4655 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4656 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4657 | u64 num_bytes; | |
6a63209f | 4658 | |
8929ecfa | 4659 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4660 | |
8929ecfa | 4661 | spin_lock(&sinfo->lock); |
1f699d38 | 4662 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4663 | |
fdf30d1c | 4664 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4665 | |
8929ecfa | 4666 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4667 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4668 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4669 | |
4670 | if (sinfo->total_bytes > num_bytes) { | |
4671 | num_bytes = sinfo->total_bytes - num_bytes; | |
4672 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4673 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4674 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4675 | sinfo->flags, num_bytes, 1); |
6a63209f | 4676 | } |
6a63209f | 4677 | |
8929ecfa YZ |
4678 | if (block_rsv->reserved >= block_rsv->size) { |
4679 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4680 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4681 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4682 | sinfo->flags, num_bytes, 0); |
8929ecfa YZ |
4683 | block_rsv->reserved = block_rsv->size; |
4684 | block_rsv->full = 1; | |
4685 | } | |
182608c8 | 4686 | |
8929ecfa | 4687 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4688 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4689 | } |
4690 | ||
f0486c68 | 4691 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4692 | { |
f0486c68 | 4693 | struct btrfs_space_info *space_info; |
6a63209f | 4694 | |
f0486c68 YZ |
4695 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4696 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4697 | |
f0486c68 | 4698 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4699 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4700 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4701 | fs_info->trans_block_rsv.space_info = space_info; |
4702 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4703 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4704 | |
8929ecfa YZ |
4705 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4706 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4707 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4708 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
4709 | if (fs_info->quota_root) |
4710 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4711 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4712 | |
8929ecfa | 4713 | update_global_block_rsv(fs_info); |
6a63209f JB |
4714 | } |
4715 | ||
8929ecfa | 4716 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4717 | { |
8c2a3ca2 JB |
4718 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4719 | (u64)-1); | |
8929ecfa YZ |
4720 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4721 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4722 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4723 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4724 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4725 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4726 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4727 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4728 | } |
4729 | ||
a22285a6 YZ |
4730 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4731 | struct btrfs_root *root) | |
6a63209f | 4732 | { |
0e721106 JB |
4733 | if (!trans->block_rsv) |
4734 | return; | |
4735 | ||
a22285a6 YZ |
4736 | if (!trans->bytes_reserved) |
4737 | return; | |
6a63209f | 4738 | |
e77266e4 | 4739 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4740 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4741 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4742 | trans->bytes_reserved = 0; |
4743 | } | |
6a63209f | 4744 | |
79787eaa | 4745 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4746 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4747 | struct inode *inode) | |
4748 | { | |
4749 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4750 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4751 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4752 | ||
4753 | /* | |
fcb80c2a JB |
4754 | * We need to hold space in order to delete our orphan item once we've |
4755 | * added it, so this takes the reservation so we can release it later | |
4756 | * when we are truly done with the orphan item. | |
d68fc57b | 4757 | */ |
ff5714cc | 4758 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4759 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4760 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4761 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4762 | } |
4763 | ||
d68fc57b | 4764 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4765 | { |
d68fc57b | 4766 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4767 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4768 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4769 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4770 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4771 | } | |
97e728d4 | 4772 | |
d5c12070 MX |
4773 | /* |
4774 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4775 | * root: the root of the parent directory | |
4776 | * rsv: block reservation | |
4777 | * items: the number of items that we need do reservation | |
4778 | * qgroup_reserved: used to return the reserved size in qgroup | |
4779 | * | |
4780 | * This function is used to reserve the space for snapshot/subvolume | |
4781 | * creation and deletion. Those operations are different with the | |
4782 | * common file/directory operations, they change two fs/file trees | |
4783 | * and root tree, the number of items that the qgroup reserves is | |
4784 | * different with the free space reservation. So we can not use | |
4785 | * the space reseravtion mechanism in start_transaction(). | |
4786 | */ | |
4787 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4788 | struct btrfs_block_rsv *rsv, | |
4789 | int items, | |
ee3441b4 JM |
4790 | u64 *qgroup_reserved, |
4791 | bool use_global_rsv) | |
a22285a6 | 4792 | { |
d5c12070 MX |
4793 | u64 num_bytes; |
4794 | int ret; | |
ee3441b4 | 4795 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
d5c12070 MX |
4796 | |
4797 | if (root->fs_info->quota_enabled) { | |
4798 | /* One for parent inode, two for dir entries */ | |
4799 | num_bytes = 3 * root->leafsize; | |
4800 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4801 | if (ret) | |
4802 | return ret; | |
4803 | } else { | |
4804 | num_bytes = 0; | |
4805 | } | |
4806 | ||
4807 | *qgroup_reserved = num_bytes; | |
4808 | ||
4809 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4810 | rsv->space_info = __find_space_info(root->fs_info, | |
4811 | BTRFS_BLOCK_GROUP_METADATA); | |
4812 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4813 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
4814 | |
4815 | if (ret == -ENOSPC && use_global_rsv) | |
4816 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); | |
4817 | ||
d5c12070 MX |
4818 | if (ret) { |
4819 | if (*qgroup_reserved) | |
4820 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4821 | } | |
4822 | ||
4823 | return ret; | |
4824 | } | |
4825 | ||
4826 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4827 | struct btrfs_block_rsv *rsv, | |
4828 | u64 qgroup_reserved) | |
4829 | { | |
4830 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4831 | if (qgroup_reserved) | |
4832 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4833 | } |
4834 | ||
7709cde3 JB |
4835 | /** |
4836 | * drop_outstanding_extent - drop an outstanding extent | |
4837 | * @inode: the inode we're dropping the extent for | |
4838 | * | |
4839 | * This is called when we are freeing up an outstanding extent, either called | |
4840 | * after an error or after an extent is written. This will return the number of | |
4841 | * reserved extents that need to be freed. This must be called with | |
4842 | * BTRFS_I(inode)->lock held. | |
4843 | */ | |
9e0baf60 JB |
4844 | static unsigned drop_outstanding_extent(struct inode *inode) |
4845 | { | |
7fd2ae21 | 4846 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4847 | unsigned dropped_extents = 0; |
4848 | ||
9e0baf60 JB |
4849 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4850 | BTRFS_I(inode)->outstanding_extents--; | |
4851 | ||
7fd2ae21 | 4852 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4853 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4854 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4855 | drop_inode_space = 1; |
7fd2ae21 | 4856 | |
9e0baf60 JB |
4857 | /* |
4858 | * If we have more or the same amount of outsanding extents than we have | |
4859 | * reserved then we need to leave the reserved extents count alone. | |
4860 | */ | |
4861 | if (BTRFS_I(inode)->outstanding_extents >= | |
4862 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4863 | return drop_inode_space; |
9e0baf60 JB |
4864 | |
4865 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4866 | BTRFS_I(inode)->outstanding_extents; | |
4867 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4868 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4869 | } |
4870 | ||
7709cde3 JB |
4871 | /** |
4872 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4873 | * reserved/free'd for the given bytes. | |
4874 | * @inode: the inode we're manipulating | |
4875 | * @num_bytes: the number of bytes in question | |
4876 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4877 | * | |
4878 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4879 | * correct amount of metadata that must either be reserved or freed. We | |
4880 | * calculate how many checksums we can fit into one leaf and then divide the | |
4881 | * number of bytes that will need to be checksumed by this value to figure out | |
4882 | * how many checksums will be required. If we are adding bytes then the number | |
4883 | * may go up and we will return the number of additional bytes that must be | |
4884 | * reserved. If it is going down we will return the number of bytes that must | |
4885 | * be freed. | |
4886 | * | |
4887 | * This must be called with BTRFS_I(inode)->lock held. | |
4888 | */ | |
4889 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4890 | int reserve) | |
6324fbf3 | 4891 | { |
7709cde3 JB |
4892 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4893 | u64 csum_size; | |
4894 | int num_csums_per_leaf; | |
4895 | int num_csums; | |
4896 | int old_csums; | |
4897 | ||
4898 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4899 | BTRFS_I(inode)->csum_bytes == 0) | |
4900 | return 0; | |
4901 | ||
4902 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4903 | if (reserve) | |
4904 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4905 | else | |
4906 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4907 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4908 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4909 | sizeof(struct btrfs_csum_item) + | |
4910 | sizeof(struct btrfs_disk_key)); | |
4911 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4912 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4913 | num_csums = num_csums / num_csums_per_leaf; | |
4914 | ||
4915 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4916 | old_csums = old_csums / num_csums_per_leaf; | |
4917 | ||
4918 | /* No change, no need to reserve more */ | |
4919 | if (old_csums == num_csums) | |
4920 | return 0; | |
4921 | ||
4922 | if (reserve) | |
4923 | return btrfs_calc_trans_metadata_size(root, | |
4924 | num_csums - old_csums); | |
4925 | ||
4926 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4927 | } |
c146afad | 4928 | |
0ca1f7ce YZ |
4929 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4930 | { | |
4931 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4932 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4933 | u64 to_reserve = 0; |
660d3f6c | 4934 | u64 csum_bytes; |
9e0baf60 | 4935 | unsigned nr_extents = 0; |
660d3f6c | 4936 | int extra_reserve = 0; |
08e007d2 | 4937 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4938 | int ret = 0; |
c64c2bd8 | 4939 | bool delalloc_lock = true; |
88e081bf WS |
4940 | u64 to_free = 0; |
4941 | unsigned dropped; | |
6324fbf3 | 4942 | |
c64c2bd8 JB |
4943 | /* If we are a free space inode we need to not flush since we will be in |
4944 | * the middle of a transaction commit. We also don't need the delalloc | |
4945 | * mutex since we won't race with anybody. We need this mostly to make | |
4946 | * lockdep shut its filthy mouth. | |
4947 | */ | |
4948 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4949 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4950 | delalloc_lock = false; |
4951 | } | |
c09544e0 | 4952 | |
08e007d2 MX |
4953 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4954 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4955 | schedule_timeout(1); |
ec44a35c | 4956 | |
c64c2bd8 JB |
4957 | if (delalloc_lock) |
4958 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4959 | ||
0ca1f7ce | 4960 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4961 | |
9e0baf60 JB |
4962 | spin_lock(&BTRFS_I(inode)->lock); |
4963 | BTRFS_I(inode)->outstanding_extents++; | |
4964 | ||
4965 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4966 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4967 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4968 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4969 | |
7fd2ae21 JB |
4970 | /* |
4971 | * Add an item to reserve for updating the inode when we complete the | |
4972 | * delalloc io. | |
4973 | */ | |
72ac3c0d JB |
4974 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4975 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4976 | nr_extents++; |
660d3f6c | 4977 | extra_reserve = 1; |
593060d7 | 4978 | } |
7fd2ae21 JB |
4979 | |
4980 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4981 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4982 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4983 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4984 | |
88e081bf | 4985 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4986 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4987 | nr_extents * root->leafsize); | |
88e081bf WS |
4988 | if (ret) |
4989 | goto out_fail; | |
4990 | } | |
c5567237 | 4991 | |
88e081bf WS |
4992 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4993 | if (unlikely(ret)) { | |
4994 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4995 | btrfs_qgroup_free(root, num_bytes + |
4996 | nr_extents * root->leafsize); | |
88e081bf | 4997 | goto out_fail; |
9e0baf60 | 4998 | } |
25179201 | 4999 | |
660d3f6c JB |
5000 | spin_lock(&BTRFS_I(inode)->lock); |
5001 | if (extra_reserve) { | |
72ac3c0d JB |
5002 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
5003 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
5004 | nr_extents--; |
5005 | } | |
5006 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
5007 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
5008 | |
5009 | if (delalloc_lock) | |
5010 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 5011 | |
8c2a3ca2 | 5012 | if (to_reserve) |
67871254 | 5013 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
8c2a3ca2 | 5014 | btrfs_ino(inode), to_reserve, 1); |
0ca1f7ce YZ |
5015 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
5016 | ||
0ca1f7ce | 5017 | return 0; |
88e081bf WS |
5018 | |
5019 | out_fail: | |
5020 | spin_lock(&BTRFS_I(inode)->lock); | |
5021 | dropped = drop_outstanding_extent(inode); | |
5022 | /* | |
5023 | * If the inodes csum_bytes is the same as the original | |
5024 | * csum_bytes then we know we haven't raced with any free()ers | |
5025 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 5026 | */ |
f4881bc7 | 5027 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 5028 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
5029 | } else { |
5030 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5031 | u64 bytes; | |
5032 | ||
5033 | /* | |
5034 | * This is tricky, but first we need to figure out how much we | |
5035 | * free'd from any free-ers that occured during this | |
5036 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
5037 | * before we dropped our lock, and then call the free for the | |
5038 | * number of bytes that were freed while we were trying our | |
5039 | * reservation. | |
5040 | */ | |
5041 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
5042 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
5043 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
5044 | ||
5045 | ||
5046 | /* | |
5047 | * Now we need to see how much we would have freed had we not | |
5048 | * been making this reservation and our ->csum_bytes were not | |
5049 | * artificially inflated. | |
5050 | */ | |
5051 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
5052 | bytes = csum_bytes - orig_csum_bytes; | |
5053 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
5054 | ||
5055 | /* | |
5056 | * Now reset ->csum_bytes to what it should be. If bytes is | |
5057 | * more than to_free then we would have free'd more space had we | |
5058 | * not had an artificially high ->csum_bytes, so we need to free | |
5059 | * the remainder. If bytes is the same or less then we don't | |
5060 | * need to do anything, the other free-ers did the correct | |
5061 | * thing. | |
5062 | */ | |
5063 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5064 | if (bytes > to_free) | |
5065 | to_free = bytes - to_free; | |
5066 | else | |
5067 | to_free = 0; | |
5068 | } | |
88e081bf WS |
5069 | spin_unlock(&BTRFS_I(inode)->lock); |
5070 | if (dropped) | |
5071 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5072 | ||
5073 | if (to_free) { | |
5074 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5075 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5076 | btrfs_ino(inode), to_free, 0); | |
5077 | } | |
5078 | if (delalloc_lock) | |
5079 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5080 | return ret; | |
0ca1f7ce YZ |
5081 | } |
5082 | ||
7709cde3 JB |
5083 | /** |
5084 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5085 | * @inode: the inode to release the reservation for | |
5086 | * @num_bytes: the number of bytes we're releasing | |
5087 | * | |
5088 | * This will release the metadata reservation for an inode. This can be called | |
5089 | * once we complete IO for a given set of bytes to release their metadata | |
5090 | * reservations. | |
5091 | */ | |
0ca1f7ce YZ |
5092 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
5093 | { | |
5094 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
5095 | u64 to_free = 0; |
5096 | unsigned dropped; | |
0ca1f7ce YZ |
5097 | |
5098 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 5099 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 5100 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 5101 | |
0934856d MX |
5102 | if (num_bytes) |
5103 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 5104 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5105 | if (dropped > 0) |
5106 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5107 | |
8c2a3ca2 JB |
5108 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5109 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
5110 | if (root->fs_info->quota_enabled) { |
5111 | btrfs_qgroup_free(root, num_bytes + | |
5112 | dropped * root->leafsize); | |
5113 | } | |
5114 | ||
0ca1f7ce YZ |
5115 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5116 | to_free); | |
5117 | } | |
5118 | ||
7709cde3 JB |
5119 | /** |
5120 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5121 | * @inode: inode we're writing to | |
5122 | * @num_bytes: the number of bytes we want to allocate | |
5123 | * | |
5124 | * This will do the following things | |
5125 | * | |
5126 | * o reserve space in the data space info for num_bytes | |
5127 | * o reserve space in the metadata space info based on number of outstanding | |
5128 | * extents and how much csums will be needed | |
5129 | * o add to the inodes ->delalloc_bytes | |
5130 | * o add it to the fs_info's delalloc inodes list. | |
5131 | * | |
5132 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5133 | */ | |
0ca1f7ce YZ |
5134 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5135 | { | |
5136 | int ret; | |
5137 | ||
5138 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 5139 | if (ret) |
0ca1f7ce YZ |
5140 | return ret; |
5141 | ||
5142 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5143 | if (ret) { | |
5144 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5145 | return ret; | |
5146 | } | |
5147 | ||
5148 | return 0; | |
5149 | } | |
5150 | ||
7709cde3 JB |
5151 | /** |
5152 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5153 | * @inode: inode we're releasing space for | |
5154 | * @num_bytes: the number of bytes we want to free up | |
5155 | * | |
5156 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5157 | * called in the case that we don't need the metadata AND data reservations | |
5158 | * anymore. So if there is an error or we insert an inline extent. | |
5159 | * | |
5160 | * This function will release the metadata space that was not used and will | |
5161 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5162 | * list if there are no delalloc bytes left. | |
5163 | */ | |
0ca1f7ce YZ |
5164 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5165 | { | |
5166 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5167 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5168 | } |
5169 | ||
c53d613e | 5170 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 5171 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 5172 | { |
0af3d00b | 5173 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5174 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5175 | u64 total = num_bytes; |
9078a3e1 | 5176 | u64 old_val; |
db94535d | 5177 | u64 byte_in_group; |
0af3d00b | 5178 | int factor; |
3e1ad54f | 5179 | |
5d4f98a2 | 5180 | /* block accounting for super block */ |
eb73c1b7 | 5181 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 5182 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5183 | if (alloc) |
5184 | old_val += num_bytes; | |
5185 | else | |
5186 | old_val -= num_bytes; | |
6c41761f | 5187 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 5188 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 5189 | |
d397712b | 5190 | while (total) { |
db94535d | 5191 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5192 | if (!cache) |
79787eaa | 5193 | return -ENOENT; |
b742bb82 YZ |
5194 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5195 | BTRFS_BLOCK_GROUP_RAID1 | | |
5196 | BTRFS_BLOCK_GROUP_RAID10)) | |
5197 | factor = 2; | |
5198 | else | |
5199 | factor = 1; | |
9d66e233 JB |
5200 | /* |
5201 | * If this block group has free space cache written out, we | |
5202 | * need to make sure to load it if we are removing space. This | |
5203 | * is because we need the unpinning stage to actually add the | |
5204 | * space back to the block group, otherwise we will leak space. | |
5205 | */ | |
5206 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5207 | cache_block_group(cache, 1); |
0af3d00b | 5208 | |
db94535d CM |
5209 | byte_in_group = bytenr - cache->key.objectid; |
5210 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5211 | |
25179201 | 5212 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5213 | spin_lock(&cache->lock); |
0af3d00b | 5214 | |
73bc1876 | 5215 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5216 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5217 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5218 | ||
0f9dd46c | 5219 | cache->dirty = 1; |
9078a3e1 | 5220 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5221 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5222 | if (alloc) { |
db94535d | 5223 | old_val += num_bytes; |
11833d66 YZ |
5224 | btrfs_set_block_group_used(&cache->item, old_val); |
5225 | cache->reserved -= num_bytes; | |
11833d66 | 5226 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5227 | cache->space_info->bytes_used += num_bytes; |
5228 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5229 | spin_unlock(&cache->lock); |
25179201 | 5230 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5231 | } else { |
db94535d | 5232 | old_val -= num_bytes; |
c286ac48 | 5233 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5234 | cache->pinned += num_bytes; |
5235 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5236 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5237 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5238 | spin_unlock(&cache->lock); |
25179201 | 5239 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5240 | |
f0486c68 YZ |
5241 | set_extent_dirty(info->pinned_extents, |
5242 | bytenr, bytenr + num_bytes - 1, | |
5243 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5244 | } |
fa9c0d79 | 5245 | btrfs_put_block_group(cache); |
db94535d CM |
5246 | total -= num_bytes; |
5247 | bytenr += num_bytes; | |
9078a3e1 CM |
5248 | } |
5249 | return 0; | |
5250 | } | |
6324fbf3 | 5251 | |
a061fc8d CM |
5252 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5253 | { | |
0f9dd46c | 5254 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5255 | u64 bytenr; |
0f9dd46c | 5256 | |
a1897fdd LB |
5257 | spin_lock(&root->fs_info->block_group_cache_lock); |
5258 | bytenr = root->fs_info->first_logical_byte; | |
5259 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5260 | ||
5261 | if (bytenr < (u64)-1) | |
5262 | return bytenr; | |
5263 | ||
0f9dd46c JB |
5264 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5265 | if (!cache) | |
a061fc8d | 5266 | return 0; |
0f9dd46c | 5267 | |
d2fb3437 | 5268 | bytenr = cache->key.objectid; |
fa9c0d79 | 5269 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5270 | |
5271 | return bytenr; | |
a061fc8d CM |
5272 | } |
5273 | ||
f0486c68 YZ |
5274 | static int pin_down_extent(struct btrfs_root *root, |
5275 | struct btrfs_block_group_cache *cache, | |
5276 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5277 | { |
11833d66 YZ |
5278 | spin_lock(&cache->space_info->lock); |
5279 | spin_lock(&cache->lock); | |
5280 | cache->pinned += num_bytes; | |
5281 | cache->space_info->bytes_pinned += num_bytes; | |
5282 | if (reserved) { | |
5283 | cache->reserved -= num_bytes; | |
5284 | cache->space_info->bytes_reserved -= num_bytes; | |
5285 | } | |
5286 | spin_unlock(&cache->lock); | |
5287 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5288 | |
f0486c68 YZ |
5289 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5290 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
0be5dc67 JB |
5291 | if (reserved) |
5292 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); | |
f0486c68 YZ |
5293 | return 0; |
5294 | } | |
68b38550 | 5295 | |
f0486c68 YZ |
5296 | /* |
5297 | * this function must be called within transaction | |
5298 | */ | |
5299 | int btrfs_pin_extent(struct btrfs_root *root, | |
5300 | u64 bytenr, u64 num_bytes, int reserved) | |
5301 | { | |
5302 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5303 | |
f0486c68 | 5304 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5305 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5306 | |
5307 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5308 | ||
5309 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5310 | return 0; |
5311 | } | |
5312 | ||
f0486c68 | 5313 | /* |
e688b725 CM |
5314 | * this function must be called within transaction |
5315 | */ | |
dcfac415 | 5316 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5317 | u64 bytenr, u64 num_bytes) |
5318 | { | |
5319 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5320 | int ret; |
e688b725 CM |
5321 | |
5322 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5323 | if (!cache) |
5324 | return -EINVAL; | |
e688b725 CM |
5325 | |
5326 | /* | |
5327 | * pull in the free space cache (if any) so that our pin | |
5328 | * removes the free space from the cache. We have load_only set | |
5329 | * to one because the slow code to read in the free extents does check | |
5330 | * the pinned extents. | |
5331 | */ | |
f6373bf3 | 5332 | cache_block_group(cache, 1); |
e688b725 CM |
5333 | |
5334 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5335 | ||
5336 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5337 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5338 | btrfs_put_block_group(cache); |
b50c6e25 | 5339 | return ret; |
e688b725 CM |
5340 | } |
5341 | ||
8c2a1a30 JB |
5342 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
5343 | { | |
5344 | int ret; | |
5345 | struct btrfs_block_group_cache *block_group; | |
5346 | struct btrfs_caching_control *caching_ctl; | |
5347 | ||
5348 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5349 | if (!block_group) | |
5350 | return -EINVAL; | |
5351 | ||
5352 | cache_block_group(block_group, 0); | |
5353 | caching_ctl = get_caching_control(block_group); | |
5354 | ||
5355 | if (!caching_ctl) { | |
5356 | /* Logic error */ | |
5357 | BUG_ON(!block_group_cache_done(block_group)); | |
5358 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5359 | } else { | |
5360 | mutex_lock(&caching_ctl->mutex); | |
5361 | ||
5362 | if (start >= caching_ctl->progress) { | |
5363 | ret = add_excluded_extent(root, start, num_bytes); | |
5364 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5365 | ret = btrfs_remove_free_space(block_group, | |
5366 | start, num_bytes); | |
5367 | } else { | |
5368 | num_bytes = caching_ctl->progress - start; | |
5369 | ret = btrfs_remove_free_space(block_group, | |
5370 | start, num_bytes); | |
5371 | if (ret) | |
5372 | goto out_lock; | |
5373 | ||
5374 | num_bytes = (start + num_bytes) - | |
5375 | caching_ctl->progress; | |
5376 | start = caching_ctl->progress; | |
5377 | ret = add_excluded_extent(root, start, num_bytes); | |
5378 | } | |
5379 | out_lock: | |
5380 | mutex_unlock(&caching_ctl->mutex); | |
5381 | put_caching_control(caching_ctl); | |
5382 | } | |
5383 | btrfs_put_block_group(block_group); | |
5384 | return ret; | |
5385 | } | |
5386 | ||
5387 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5388 | struct extent_buffer *eb) | |
5389 | { | |
5390 | struct btrfs_file_extent_item *item; | |
5391 | struct btrfs_key key; | |
5392 | int found_type; | |
5393 | int i; | |
5394 | ||
5395 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5396 | return 0; | |
5397 | ||
5398 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5399 | btrfs_item_key_to_cpu(eb, &key, i); | |
5400 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5401 | continue; | |
5402 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5403 | found_type = btrfs_file_extent_type(eb, item); | |
5404 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5405 | continue; | |
5406 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5407 | continue; | |
5408 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5409 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5410 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5411 | } | |
5412 | ||
5413 | return 0; | |
5414 | } | |
5415 | ||
fb25e914 JB |
5416 | /** |
5417 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5418 | * @cache: The cache we are manipulating | |
5419 | * @num_bytes: The number of bytes in question | |
5420 | * @reserve: One of the reservation enums | |
5421 | * | |
5422 | * This is called by the allocator when it reserves space, or by somebody who is | |
5423 | * freeing space that was never actually used on disk. For example if you | |
5424 | * reserve some space for a new leaf in transaction A and before transaction A | |
5425 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5426 | * clear the reservation. | |
5427 | * | |
5428 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5429 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5430 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5431 | * allocating less disk space for the amount of data we have reserved in the | |
5432 | * case of compression. | |
5433 | * | |
5434 | * If this is a reservation and the block group has become read only we cannot | |
5435 | * make the reservation and return -EAGAIN, otherwise this function always | |
5436 | * succeeds. | |
f0486c68 | 5437 | */ |
fb25e914 JB |
5438 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5439 | u64 num_bytes, int reserve) | |
11833d66 | 5440 | { |
fb25e914 | 5441 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5442 | int ret = 0; |
79787eaa | 5443 | |
fb25e914 JB |
5444 | spin_lock(&space_info->lock); |
5445 | spin_lock(&cache->lock); | |
5446 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5447 | if (cache->ro) { |
5448 | ret = -EAGAIN; | |
5449 | } else { | |
fb25e914 JB |
5450 | cache->reserved += num_bytes; |
5451 | space_info->bytes_reserved += num_bytes; | |
5452 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5453 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5454 | "space_info", space_info->flags, |
5455 | num_bytes, 0); | |
fb25e914 JB |
5456 | space_info->bytes_may_use -= num_bytes; |
5457 | } | |
f0486c68 | 5458 | } |
fb25e914 JB |
5459 | } else { |
5460 | if (cache->ro) | |
5461 | space_info->bytes_readonly += num_bytes; | |
5462 | cache->reserved -= num_bytes; | |
5463 | space_info->bytes_reserved -= num_bytes; | |
324ae4df | 5464 | } |
fb25e914 JB |
5465 | spin_unlock(&cache->lock); |
5466 | spin_unlock(&space_info->lock); | |
f0486c68 | 5467 | return ret; |
324ae4df | 5468 | } |
9078a3e1 | 5469 | |
143bede5 | 5470 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5471 | struct btrfs_root *root) |
e8569813 | 5472 | { |
e8569813 | 5473 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5474 | struct btrfs_caching_control *next; |
5475 | struct btrfs_caching_control *caching_ctl; | |
5476 | struct btrfs_block_group_cache *cache; | |
b150a4f1 | 5477 | struct btrfs_space_info *space_info; |
e8569813 | 5478 | |
11833d66 | 5479 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5480 | |
11833d66 YZ |
5481 | list_for_each_entry_safe(caching_ctl, next, |
5482 | &fs_info->caching_block_groups, list) { | |
5483 | cache = caching_ctl->block_group; | |
5484 | if (block_group_cache_done(cache)) { | |
5485 | cache->last_byte_to_unpin = (u64)-1; | |
5486 | list_del_init(&caching_ctl->list); | |
5487 | put_caching_control(caching_ctl); | |
e8569813 | 5488 | } else { |
11833d66 | 5489 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5490 | } |
e8569813 | 5491 | } |
11833d66 YZ |
5492 | |
5493 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5494 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5495 | else | |
5496 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5497 | ||
5498 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa | 5499 | |
b150a4f1 JB |
5500 | list_for_each_entry_rcu(space_info, &fs_info->space_info, list) |
5501 | percpu_counter_set(&space_info->total_bytes_pinned, 0); | |
5502 | ||
8929ecfa | 5503 | update_global_block_rsv(fs_info); |
e8569813 ZY |
5504 | } |
5505 | ||
11833d66 | 5506 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5507 | { |
11833d66 YZ |
5508 | struct btrfs_fs_info *fs_info = root->fs_info; |
5509 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5510 | struct btrfs_space_info *space_info; |
5511 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5512 | u64 len; |
7b398f8e | 5513 | bool readonly; |
ccd467d6 | 5514 | |
11833d66 | 5515 | while (start <= end) { |
7b398f8e | 5516 | readonly = false; |
11833d66 YZ |
5517 | if (!cache || |
5518 | start >= cache->key.objectid + cache->key.offset) { | |
5519 | if (cache) | |
5520 | btrfs_put_block_group(cache); | |
5521 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5522 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5523 | } |
5524 | ||
5525 | len = cache->key.objectid + cache->key.offset - start; | |
5526 | len = min(len, end + 1 - start); | |
5527 | ||
5528 | if (start < cache->last_byte_to_unpin) { | |
5529 | len = min(len, cache->last_byte_to_unpin - start); | |
5530 | btrfs_add_free_space(cache, start, len); | |
5531 | } | |
5532 | ||
f0486c68 | 5533 | start += len; |
7b398f8e | 5534 | space_info = cache->space_info; |
f0486c68 | 5535 | |
7b398f8e | 5536 | spin_lock(&space_info->lock); |
11833d66 YZ |
5537 | spin_lock(&cache->lock); |
5538 | cache->pinned -= len; | |
7b398f8e JB |
5539 | space_info->bytes_pinned -= len; |
5540 | if (cache->ro) { | |
5541 | space_info->bytes_readonly += len; | |
5542 | readonly = true; | |
5543 | } | |
11833d66 | 5544 | spin_unlock(&cache->lock); |
7b398f8e JB |
5545 | if (!readonly && global_rsv->space_info == space_info) { |
5546 | spin_lock(&global_rsv->lock); | |
5547 | if (!global_rsv->full) { | |
5548 | len = min(len, global_rsv->size - | |
5549 | global_rsv->reserved); | |
5550 | global_rsv->reserved += len; | |
5551 | space_info->bytes_may_use += len; | |
5552 | if (global_rsv->reserved >= global_rsv->size) | |
5553 | global_rsv->full = 1; | |
5554 | } | |
5555 | spin_unlock(&global_rsv->lock); | |
5556 | } | |
5557 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5558 | } |
11833d66 YZ |
5559 | |
5560 | if (cache) | |
5561 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5562 | return 0; |
5563 | } | |
5564 | ||
5565 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5566 | struct btrfs_root *root) |
a28ec197 | 5567 | { |
11833d66 YZ |
5568 | struct btrfs_fs_info *fs_info = root->fs_info; |
5569 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5570 | u64 start; |
5571 | u64 end; | |
a28ec197 | 5572 | int ret; |
a28ec197 | 5573 | |
79787eaa JM |
5574 | if (trans->aborted) |
5575 | return 0; | |
5576 | ||
11833d66 YZ |
5577 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5578 | unpin = &fs_info->freed_extents[1]; | |
5579 | else | |
5580 | unpin = &fs_info->freed_extents[0]; | |
5581 | ||
d397712b | 5582 | while (1) { |
1a5bc167 | 5583 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5584 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5585 | if (ret) |
a28ec197 | 5586 | break; |
1f3c79a2 | 5587 | |
5378e607 LD |
5588 | if (btrfs_test_opt(root, DISCARD)) |
5589 | ret = btrfs_discard_extent(root, start, | |
5590 | end + 1 - start, NULL); | |
1f3c79a2 | 5591 | |
1a5bc167 | 5592 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5593 | unpin_extent_range(root, start, end); |
b9473439 | 5594 | cond_resched(); |
a28ec197 | 5595 | } |
817d52f8 | 5596 | |
e20d96d6 CM |
5597 | return 0; |
5598 | } | |
5599 | ||
b150a4f1 JB |
5600 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
5601 | u64 owner, u64 root_objectid) | |
5602 | { | |
5603 | struct btrfs_space_info *space_info; | |
5604 | u64 flags; | |
5605 | ||
5606 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
5607 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
5608 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
5609 | else | |
5610 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
5611 | } else { | |
5612 | flags = BTRFS_BLOCK_GROUP_DATA; | |
5613 | } | |
5614 | ||
5615 | space_info = __find_space_info(fs_info, flags); | |
5616 | BUG_ON(!space_info); /* Logic bug */ | |
5617 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
5618 | } | |
5619 | ||
5620 | ||
5d4f98a2 YZ |
5621 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5622 | struct btrfs_root *root, | |
5623 | u64 bytenr, u64 num_bytes, u64 parent, | |
5624 | u64 root_objectid, u64 owner_objectid, | |
5625 | u64 owner_offset, int refs_to_drop, | |
5626 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5627 | { |
e2fa7227 | 5628 | struct btrfs_key key; |
5d4f98a2 | 5629 | struct btrfs_path *path; |
1261ec42 CM |
5630 | struct btrfs_fs_info *info = root->fs_info; |
5631 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5632 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5633 | struct btrfs_extent_item *ei; |
5634 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5635 | int ret; |
5d4f98a2 | 5636 | int is_data; |
952fccac CM |
5637 | int extent_slot = 0; |
5638 | int found_extent = 0; | |
5639 | int num_to_del = 1; | |
5d4f98a2 YZ |
5640 | u32 item_size; |
5641 | u64 refs; | |
3173a18f JB |
5642 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
5643 | SKINNY_METADATA); | |
037e6390 | 5644 | |
5caf2a00 | 5645 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5646 | if (!path) |
5647 | return -ENOMEM; | |
5f26f772 | 5648 | |
3c12ac72 | 5649 | path->reada = 1; |
b9473439 | 5650 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5651 | |
5652 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5653 | BUG_ON(!is_data && refs_to_drop != 1); | |
5654 | ||
3173a18f JB |
5655 | if (is_data) |
5656 | skinny_metadata = 0; | |
5657 | ||
5d4f98a2 YZ |
5658 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
5659 | bytenr, num_bytes, parent, | |
5660 | root_objectid, owner_objectid, | |
5661 | owner_offset); | |
7bb86316 | 5662 | if (ret == 0) { |
952fccac | 5663 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5664 | while (extent_slot >= 0) { |
5665 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5666 | extent_slot); |
5d4f98a2 | 5667 | if (key.objectid != bytenr) |
952fccac | 5668 | break; |
5d4f98a2 YZ |
5669 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5670 | key.offset == num_bytes) { | |
952fccac CM |
5671 | found_extent = 1; |
5672 | break; | |
5673 | } | |
3173a18f JB |
5674 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
5675 | key.offset == owner_objectid) { | |
5676 | found_extent = 1; | |
5677 | break; | |
5678 | } | |
952fccac CM |
5679 | if (path->slots[0] - extent_slot > 5) |
5680 | break; | |
5d4f98a2 | 5681 | extent_slot--; |
952fccac | 5682 | } |
5d4f98a2 YZ |
5683 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5684 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5685 | if (found_extent && item_size < sizeof(*ei)) | |
5686 | found_extent = 0; | |
5687 | #endif | |
31840ae1 | 5688 | if (!found_extent) { |
5d4f98a2 | 5689 | BUG_ON(iref); |
56bec294 | 5690 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5691 | NULL, refs_to_drop, |
5692 | is_data); | |
005d6427 DS |
5693 | if (ret) { |
5694 | btrfs_abort_transaction(trans, extent_root, ret); | |
5695 | goto out; | |
5696 | } | |
b3b4aa74 | 5697 | btrfs_release_path(path); |
b9473439 | 5698 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5699 | |
5700 | key.objectid = bytenr; | |
5701 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5702 | key.offset = num_bytes; | |
5703 | ||
3173a18f JB |
5704 | if (!is_data && skinny_metadata) { |
5705 | key.type = BTRFS_METADATA_ITEM_KEY; | |
5706 | key.offset = owner_objectid; | |
5707 | } | |
5708 | ||
31840ae1 ZY |
5709 | ret = btrfs_search_slot(trans, extent_root, |
5710 | &key, path, -1, 1); | |
3173a18f JB |
5711 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
5712 | /* | |
5713 | * Couldn't find our skinny metadata item, | |
5714 | * see if we have ye olde extent item. | |
5715 | */ | |
5716 | path->slots[0]--; | |
5717 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
5718 | path->slots[0]); | |
5719 | if (key.objectid == bytenr && | |
5720 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
5721 | key.offset == num_bytes) | |
5722 | ret = 0; | |
5723 | } | |
5724 | ||
5725 | if (ret > 0 && skinny_metadata) { | |
5726 | skinny_metadata = false; | |
5727 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5728 | key.offset = num_bytes; | |
5729 | btrfs_release_path(path); | |
5730 | ret = btrfs_search_slot(trans, extent_root, | |
5731 | &key, path, -1, 1); | |
5732 | } | |
5733 | ||
f3465ca4 | 5734 | if (ret) { |
c2cf52eb | 5735 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 5736 | ret, bytenr); |
b783e62d JB |
5737 | if (ret > 0) |
5738 | btrfs_print_leaf(extent_root, | |
5739 | path->nodes[0]); | |
f3465ca4 | 5740 | } |
005d6427 DS |
5741 | if (ret < 0) { |
5742 | btrfs_abort_transaction(trans, extent_root, ret); | |
5743 | goto out; | |
5744 | } | |
31840ae1 ZY |
5745 | extent_slot = path->slots[0]; |
5746 | } | |
fae7f21c | 5747 | } else if (WARN_ON(ret == -ENOENT)) { |
7bb86316 | 5748 | btrfs_print_leaf(extent_root, path->nodes[0]); |
c2cf52eb SK |
5749 | btrfs_err(info, |
5750 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
c1c9ff7c GU |
5751 | bytenr, parent, root_objectid, owner_objectid, |
5752 | owner_offset); | |
79787eaa | 5753 | } else { |
005d6427 DS |
5754 | btrfs_abort_transaction(trans, extent_root, ret); |
5755 | goto out; | |
7bb86316 | 5756 | } |
5f39d397 CM |
5757 | |
5758 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5759 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5760 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5761 | if (item_size < sizeof(*ei)) { | |
5762 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5763 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5764 | owner_objectid, 0); | |
005d6427 DS |
5765 | if (ret < 0) { |
5766 | btrfs_abort_transaction(trans, extent_root, ret); | |
5767 | goto out; | |
5768 | } | |
5d4f98a2 | 5769 | |
b3b4aa74 | 5770 | btrfs_release_path(path); |
5d4f98a2 YZ |
5771 | path->leave_spinning = 1; |
5772 | ||
5773 | key.objectid = bytenr; | |
5774 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5775 | key.offset = num_bytes; | |
5776 | ||
5777 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5778 | -1, 1); | |
5779 | if (ret) { | |
c2cf52eb | 5780 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 5781 | ret, bytenr); |
5d4f98a2 YZ |
5782 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5783 | } | |
005d6427 DS |
5784 | if (ret < 0) { |
5785 | btrfs_abort_transaction(trans, extent_root, ret); | |
5786 | goto out; | |
5787 | } | |
5788 | ||
5d4f98a2 YZ |
5789 | extent_slot = path->slots[0]; |
5790 | leaf = path->nodes[0]; | |
5791 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5792 | } | |
5793 | #endif | |
5794 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5795 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5796 | struct btrfs_extent_item); |
3173a18f JB |
5797 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
5798 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
5799 | struct btrfs_tree_block_info *bi; |
5800 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5801 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5802 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5803 | } | |
56bec294 | 5804 | |
5d4f98a2 | 5805 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
5806 | if (refs < refs_to_drop) { |
5807 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
5808 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); | |
5809 | ret = -EINVAL; | |
5810 | btrfs_abort_transaction(trans, extent_root, ret); | |
5811 | goto out; | |
5812 | } | |
56bec294 | 5813 | refs -= refs_to_drop; |
5f39d397 | 5814 | |
5d4f98a2 YZ |
5815 | if (refs > 0) { |
5816 | if (extent_op) | |
5817 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5818 | /* | |
5819 | * In the case of inline back ref, reference count will | |
5820 | * be updated by remove_extent_backref | |
952fccac | 5821 | */ |
5d4f98a2 YZ |
5822 | if (iref) { |
5823 | BUG_ON(!found_extent); | |
5824 | } else { | |
5825 | btrfs_set_extent_refs(leaf, ei, refs); | |
5826 | btrfs_mark_buffer_dirty(leaf); | |
5827 | } | |
5828 | if (found_extent) { | |
5829 | ret = remove_extent_backref(trans, extent_root, path, | |
5830 | iref, refs_to_drop, | |
5831 | is_data); | |
005d6427 DS |
5832 | if (ret) { |
5833 | btrfs_abort_transaction(trans, extent_root, ret); | |
5834 | goto out; | |
5835 | } | |
952fccac | 5836 | } |
b150a4f1 JB |
5837 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
5838 | root_objectid); | |
5d4f98a2 | 5839 | } else { |
5d4f98a2 YZ |
5840 | if (found_extent) { |
5841 | BUG_ON(is_data && refs_to_drop != | |
5842 | extent_data_ref_count(root, path, iref)); | |
5843 | if (iref) { | |
5844 | BUG_ON(path->slots[0] != extent_slot); | |
5845 | } else { | |
5846 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5847 | path->slots[0] = extent_slot; | |
5848 | num_to_del = 2; | |
5849 | } | |
78fae27e | 5850 | } |
b9473439 | 5851 | |
952fccac CM |
5852 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5853 | num_to_del); | |
005d6427 DS |
5854 | if (ret) { |
5855 | btrfs_abort_transaction(trans, extent_root, ret); | |
5856 | goto out; | |
5857 | } | |
b3b4aa74 | 5858 | btrfs_release_path(path); |
21af804c | 5859 | |
5d4f98a2 | 5860 | if (is_data) { |
459931ec | 5861 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5862 | if (ret) { |
5863 | btrfs_abort_transaction(trans, extent_root, ret); | |
5864 | goto out; | |
5865 | } | |
459931ec CM |
5866 | } |
5867 | ||
c53d613e | 5868 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5869 | if (ret) { |
5870 | btrfs_abort_transaction(trans, extent_root, ret); | |
5871 | goto out; | |
5872 | } | |
a28ec197 | 5873 | } |
79787eaa | 5874 | out: |
5caf2a00 | 5875 | btrfs_free_path(path); |
a28ec197 CM |
5876 | return ret; |
5877 | } | |
5878 | ||
1887be66 | 5879 | /* |
f0486c68 | 5880 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5881 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5882 | * a given extent, and if there are no other delayed refs to be processed, it | |
5883 | * removes it from the tree. | |
5884 | */ | |
5885 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5886 | struct btrfs_root *root, u64 bytenr) | |
5887 | { | |
5888 | struct btrfs_delayed_ref_head *head; | |
5889 | struct btrfs_delayed_ref_root *delayed_refs; | |
f0486c68 | 5890 | int ret = 0; |
1887be66 CM |
5891 | |
5892 | delayed_refs = &trans->transaction->delayed_refs; | |
5893 | spin_lock(&delayed_refs->lock); | |
5894 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5895 | if (!head) | |
5896 | goto out; | |
5897 | ||
d7df2c79 JB |
5898 | spin_lock(&head->lock); |
5899 | if (rb_first(&head->ref_root)) | |
1887be66 CM |
5900 | goto out; |
5901 | ||
5d4f98a2 YZ |
5902 | if (head->extent_op) { |
5903 | if (!head->must_insert_reserved) | |
5904 | goto out; | |
78a6184a | 5905 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5906 | head->extent_op = NULL; |
5907 | } | |
5908 | ||
1887be66 CM |
5909 | /* |
5910 | * waiting for the lock here would deadlock. If someone else has it | |
5911 | * locked they are already in the process of dropping it anyway | |
5912 | */ | |
5913 | if (!mutex_trylock(&head->mutex)) | |
5914 | goto out; | |
5915 | ||
5916 | /* | |
5917 | * at this point we have a head with no other entries. Go | |
5918 | * ahead and process it. | |
5919 | */ | |
5920 | head->node.in_tree = 0; | |
c46effa6 | 5921 | rb_erase(&head->href_node, &delayed_refs->href_root); |
c3e69d58 | 5922 | |
d7df2c79 | 5923 | atomic_dec(&delayed_refs->num_entries); |
1887be66 CM |
5924 | |
5925 | /* | |
5926 | * we don't take a ref on the node because we're removing it from the | |
5927 | * tree, so we just steal the ref the tree was holding. | |
5928 | */ | |
c3e69d58 | 5929 | delayed_refs->num_heads--; |
d7df2c79 | 5930 | if (head->processing == 0) |
c3e69d58 | 5931 | delayed_refs->num_heads_ready--; |
d7df2c79 JB |
5932 | head->processing = 0; |
5933 | spin_unlock(&head->lock); | |
1887be66 CM |
5934 | spin_unlock(&delayed_refs->lock); |
5935 | ||
f0486c68 YZ |
5936 | BUG_ON(head->extent_op); |
5937 | if (head->must_insert_reserved) | |
5938 | ret = 1; | |
5939 | ||
5940 | mutex_unlock(&head->mutex); | |
1887be66 | 5941 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5942 | return ret; |
1887be66 | 5943 | out: |
d7df2c79 | 5944 | spin_unlock(&head->lock); |
1887be66 CM |
5945 | spin_unlock(&delayed_refs->lock); |
5946 | return 0; | |
5947 | } | |
5948 | ||
f0486c68 YZ |
5949 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5950 | struct btrfs_root *root, | |
5951 | struct extent_buffer *buf, | |
5581a51a | 5952 | u64 parent, int last_ref) |
f0486c68 | 5953 | { |
f0486c68 | 5954 | struct btrfs_block_group_cache *cache = NULL; |
b150a4f1 | 5955 | int pin = 1; |
f0486c68 YZ |
5956 | int ret; |
5957 | ||
5958 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5959 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5960 | buf->start, buf->len, | |
5961 | parent, root->root_key.objectid, | |
5962 | btrfs_header_level(buf), | |
5581a51a | 5963 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5964 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5965 | } |
5966 | ||
5967 | if (!last_ref) | |
5968 | return; | |
5969 | ||
f0486c68 | 5970 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5971 | |
5972 | if (btrfs_header_generation(buf) == trans->transid) { | |
5973 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5974 | ret = check_ref_cleanup(trans, root, buf->start); | |
5975 | if (!ret) | |
37be25bc | 5976 | goto out; |
f0486c68 YZ |
5977 | } |
5978 | ||
5979 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5980 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5981 | goto out; |
f0486c68 YZ |
5982 | } |
5983 | ||
5984 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5985 | ||
5986 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5987 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
0be5dc67 | 5988 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); |
b150a4f1 | 5989 | pin = 0; |
f0486c68 YZ |
5990 | } |
5991 | out: | |
b150a4f1 JB |
5992 | if (pin) |
5993 | add_pinned_bytes(root->fs_info, buf->len, | |
5994 | btrfs_header_level(buf), | |
5995 | root->root_key.objectid); | |
5996 | ||
a826d6dc JB |
5997 | /* |
5998 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5999 | * anymore. | |
6000 | */ | |
6001 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
6002 | btrfs_put_block_group(cache); |
6003 | } | |
6004 | ||
79787eaa | 6005 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
6006 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
6007 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
6008 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
6009 | { |
6010 | int ret; | |
66d7e7f0 | 6011 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 6012 | |
b150a4f1 JB |
6013 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
6014 | ||
56bec294 CM |
6015 | /* |
6016 | * tree log blocks never actually go into the extent allocation | |
6017 | * tree, just update pinning info and exit early. | |
56bec294 | 6018 | */ |
5d4f98a2 YZ |
6019 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
6020 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 6021 | /* unlocks the pinned mutex */ |
11833d66 | 6022 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 6023 | ret = 0; |
5d4f98a2 | 6024 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
6025 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
6026 | num_bytes, | |
5d4f98a2 | 6027 | parent, root_objectid, (int)owner, |
66d7e7f0 | 6028 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 6029 | } else { |
66d7e7f0 AJ |
6030 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
6031 | num_bytes, | |
6032 | parent, root_objectid, owner, | |
6033 | offset, BTRFS_DROP_DELAYED_REF, | |
6034 | NULL, for_cow); | |
56bec294 | 6035 | } |
925baedd CM |
6036 | return ret; |
6037 | } | |
6038 | ||
53b381b3 DW |
6039 | static u64 stripe_align(struct btrfs_root *root, |
6040 | struct btrfs_block_group_cache *cache, | |
6041 | u64 val, u64 num_bytes) | |
87ee04eb | 6042 | { |
fda2832f | 6043 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
6044 | return ret; |
6045 | } | |
6046 | ||
817d52f8 JB |
6047 | /* |
6048 | * when we wait for progress in the block group caching, its because | |
6049 | * our allocation attempt failed at least once. So, we must sleep | |
6050 | * and let some progress happen before we try again. | |
6051 | * | |
6052 | * This function will sleep at least once waiting for new free space to | |
6053 | * show up, and then it will check the block group free space numbers | |
6054 | * for our min num_bytes. Another option is to have it go ahead | |
6055 | * and look in the rbtree for a free extent of a given size, but this | |
6056 | * is a good start. | |
36cce922 JB |
6057 | * |
6058 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
6059 | * any of the information in this block group. | |
817d52f8 | 6060 | */ |
36cce922 | 6061 | static noinline void |
817d52f8 JB |
6062 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
6063 | u64 num_bytes) | |
6064 | { | |
11833d66 | 6065 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 6066 | |
11833d66 YZ |
6067 | caching_ctl = get_caching_control(cache); |
6068 | if (!caching_ctl) | |
36cce922 | 6069 | return; |
817d52f8 | 6070 | |
11833d66 | 6071 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 6072 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
6073 | |
6074 | put_caching_control(caching_ctl); | |
11833d66 YZ |
6075 | } |
6076 | ||
6077 | static noinline int | |
6078 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6079 | { | |
6080 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 6081 | int ret = 0; |
11833d66 YZ |
6082 | |
6083 | caching_ctl = get_caching_control(cache); | |
6084 | if (!caching_ctl) | |
36cce922 | 6085 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
6086 | |
6087 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
6088 | if (cache->cached == BTRFS_CACHE_ERROR) |
6089 | ret = -EIO; | |
11833d66 | 6090 | put_caching_control(caching_ctl); |
36cce922 | 6091 | return ret; |
817d52f8 JB |
6092 | } |
6093 | ||
31e50229 | 6094 | int __get_raid_index(u64 flags) |
b742bb82 | 6095 | { |
7738a53a | 6096 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 6097 | return BTRFS_RAID_RAID10; |
7738a53a | 6098 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 6099 | return BTRFS_RAID_RAID1; |
7738a53a | 6100 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 6101 | return BTRFS_RAID_DUP; |
7738a53a | 6102 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 6103 | return BTRFS_RAID_RAID0; |
53b381b3 | 6104 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 6105 | return BTRFS_RAID_RAID5; |
53b381b3 | 6106 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 6107 | return BTRFS_RAID_RAID6; |
7738a53a | 6108 | |
e942f883 | 6109 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
6110 | } |
6111 | ||
6ab0a202 | 6112 | int get_block_group_index(struct btrfs_block_group_cache *cache) |
7738a53a | 6113 | { |
31e50229 | 6114 | return __get_raid_index(cache->flags); |
7738a53a ID |
6115 | } |
6116 | ||
6ab0a202 JM |
6117 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { |
6118 | [BTRFS_RAID_RAID10] = "raid10", | |
6119 | [BTRFS_RAID_RAID1] = "raid1", | |
6120 | [BTRFS_RAID_DUP] = "dup", | |
6121 | [BTRFS_RAID_RAID0] = "raid0", | |
6122 | [BTRFS_RAID_SINGLE] = "single", | |
6123 | [BTRFS_RAID_RAID5] = "raid5", | |
6124 | [BTRFS_RAID_RAID6] = "raid6", | |
6125 | }; | |
6126 | ||
1b8e5df6 | 6127 | static const char *get_raid_name(enum btrfs_raid_types type) |
6ab0a202 JM |
6128 | { |
6129 | if (type >= BTRFS_NR_RAID_TYPES) | |
6130 | return NULL; | |
6131 | ||
6132 | return btrfs_raid_type_names[type]; | |
6133 | } | |
6134 | ||
817d52f8 | 6135 | enum btrfs_loop_type { |
285ff5af JB |
6136 | LOOP_CACHING_NOWAIT = 0, |
6137 | LOOP_CACHING_WAIT = 1, | |
6138 | LOOP_ALLOC_CHUNK = 2, | |
6139 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
6140 | }; |
6141 | ||
fec577fb CM |
6142 | /* |
6143 | * walks the btree of allocated extents and find a hole of a given size. | |
6144 | * The key ins is changed to record the hole: | |
a4820398 | 6145 | * ins->objectid == start position |
62e2749e | 6146 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
a4820398 | 6147 | * ins->offset == the size of the hole. |
fec577fb | 6148 | * Any available blocks before search_start are skipped. |
a4820398 MX |
6149 | * |
6150 | * If there is no suitable free space, we will record the max size of | |
6151 | * the free space extent currently. | |
fec577fb | 6152 | */ |
00361589 | 6153 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
98ed5174 | 6154 | u64 num_bytes, u64 empty_size, |
98ed5174 | 6155 | u64 hint_byte, struct btrfs_key *ins, |
b6919a58 | 6156 | u64 flags) |
fec577fb | 6157 | { |
80eb234a | 6158 | int ret = 0; |
d397712b | 6159 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 6160 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 6161 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 6162 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 6163 | u64 search_start = 0; |
a4820398 | 6164 | u64 max_extent_size = 0; |
239b14b3 | 6165 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 6166 | struct btrfs_space_info *space_info; |
fa9c0d79 | 6167 | int loop = 0; |
b6919a58 DS |
6168 | int index = __get_raid_index(flags); |
6169 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
fb25e914 | 6170 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
0a24325e | 6171 | bool failed_cluster_refill = false; |
1cdda9b8 | 6172 | bool failed_alloc = false; |
67377734 | 6173 | bool use_cluster = true; |
60d2adbb | 6174 | bool have_caching_bg = false; |
fec577fb | 6175 | |
db94535d | 6176 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 6177 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
6178 | ins->objectid = 0; |
6179 | ins->offset = 0; | |
b1a4d965 | 6180 | |
b6919a58 | 6181 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
3f7de037 | 6182 | |
b6919a58 | 6183 | space_info = __find_space_info(root->fs_info, flags); |
1b1d1f66 | 6184 | if (!space_info) { |
b6919a58 | 6185 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
6186 | return -ENOSPC; |
6187 | } | |
2552d17e | 6188 | |
67377734 JB |
6189 | /* |
6190 | * If the space info is for both data and metadata it means we have a | |
6191 | * small filesystem and we can't use the clustering stuff. | |
6192 | */ | |
6193 | if (btrfs_mixed_space_info(space_info)) | |
6194 | use_cluster = false; | |
6195 | ||
b6919a58 | 6196 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 6197 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
6198 | if (!btrfs_test_opt(root, SSD)) |
6199 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
6200 | } |
6201 | ||
b6919a58 | 6202 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
67377734 | 6203 | btrfs_test_opt(root, SSD)) { |
fa9c0d79 CM |
6204 | last_ptr = &root->fs_info->data_alloc_cluster; |
6205 | } | |
0f9dd46c | 6206 | |
239b14b3 | 6207 | if (last_ptr) { |
fa9c0d79 CM |
6208 | spin_lock(&last_ptr->lock); |
6209 | if (last_ptr->block_group) | |
6210 | hint_byte = last_ptr->window_start; | |
6211 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 6212 | } |
fa9c0d79 | 6213 | |
a061fc8d | 6214 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 6215 | search_start = max(search_start, hint_byte); |
0b86a832 | 6216 | |
817d52f8 | 6217 | if (!last_ptr) |
fa9c0d79 | 6218 | empty_cluster = 0; |
fa9c0d79 | 6219 | |
2552d17e | 6220 | if (search_start == hint_byte) { |
2552d17e JB |
6221 | block_group = btrfs_lookup_block_group(root->fs_info, |
6222 | search_start); | |
274bd4fb | 6223 | used_block_group = block_group; |
817d52f8 JB |
6224 | /* |
6225 | * we don't want to use the block group if it doesn't match our | |
6226 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
6227 | * |
6228 | * However if we are re-searching with an ideal block group | |
6229 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 6230 | */ |
b6919a58 | 6231 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 6232 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6233 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6234 | if (list_empty(&block_group->list) || |
6235 | block_group->ro) { | |
6236 | /* | |
6237 | * someone is removing this block group, | |
6238 | * we can't jump into the have_block_group | |
6239 | * target because our list pointers are not | |
6240 | * valid | |
6241 | */ | |
6242 | btrfs_put_block_group(block_group); | |
6243 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6244 | } else { |
b742bb82 | 6245 | index = get_block_group_index(block_group); |
44fb5511 | 6246 | goto have_block_group; |
ccf0e725 | 6247 | } |
2552d17e | 6248 | } else if (block_group) { |
fa9c0d79 | 6249 | btrfs_put_block_group(block_group); |
2552d17e | 6250 | } |
42e70e7a | 6251 | } |
2552d17e | 6252 | search: |
60d2adbb | 6253 | have_caching_bg = false; |
80eb234a | 6254 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6255 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6256 | list) { | |
6226cb0a | 6257 | u64 offset; |
817d52f8 | 6258 | int cached; |
8a1413a2 | 6259 | |
274bd4fb | 6260 | used_block_group = block_group; |
11dfe35a | 6261 | btrfs_get_block_group(block_group); |
2552d17e | 6262 | search_start = block_group->key.objectid; |
42e70e7a | 6263 | |
83a50de9 CM |
6264 | /* |
6265 | * this can happen if we end up cycling through all the | |
6266 | * raid types, but we want to make sure we only allocate | |
6267 | * for the proper type. | |
6268 | */ | |
b6919a58 | 6269 | if (!block_group_bits(block_group, flags)) { |
83a50de9 CM |
6270 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
6271 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6272 | BTRFS_BLOCK_GROUP_RAID5 | |
6273 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6274 | BTRFS_BLOCK_GROUP_RAID10; |
6275 | ||
6276 | /* | |
6277 | * if they asked for extra copies and this block group | |
6278 | * doesn't provide them, bail. This does allow us to | |
6279 | * fill raid0 from raid1. | |
6280 | */ | |
b6919a58 | 6281 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
6282 | goto loop; |
6283 | } | |
6284 | ||
2552d17e | 6285 | have_block_group: |
291c7d2f JB |
6286 | cached = block_group_cache_done(block_group); |
6287 | if (unlikely(!cached)) { | |
f6373bf3 | 6288 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6289 | BUG_ON(ret < 0); |
6290 | ret = 0; | |
817d52f8 JB |
6291 | } |
6292 | ||
36cce922 JB |
6293 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
6294 | goto loop; | |
ea6a478e | 6295 | if (unlikely(block_group->ro)) |
2552d17e | 6296 | goto loop; |
0f9dd46c | 6297 | |
0a24325e | 6298 | /* |
062c05c4 AO |
6299 | * Ok we want to try and use the cluster allocator, so |
6300 | * lets look there | |
0a24325e | 6301 | */ |
062c05c4 | 6302 | if (last_ptr) { |
8de972b4 | 6303 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6304 | /* |
6305 | * the refill lock keeps out other | |
6306 | * people trying to start a new cluster | |
6307 | */ | |
6308 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
6309 | used_block_group = last_ptr->block_group; |
6310 | if (used_block_group != block_group && | |
6311 | (!used_block_group || | |
6312 | used_block_group->ro || | |
b6919a58 | 6313 | !block_group_bits(used_block_group, flags))) { |
274bd4fb | 6314 | used_block_group = block_group; |
44fb5511 | 6315 | goto refill_cluster; |
274bd4fb AO |
6316 | } |
6317 | ||
6318 | if (used_block_group != block_group) | |
6319 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 6320 | |
274bd4fb | 6321 | offset = btrfs_alloc_from_cluster(used_block_group, |
a4820398 MX |
6322 | last_ptr, |
6323 | num_bytes, | |
6324 | used_block_group->key.objectid, | |
6325 | &max_extent_size); | |
fa9c0d79 CM |
6326 | if (offset) { |
6327 | /* we have a block, we're done */ | |
6328 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6329 | trace_btrfs_reserve_extent_cluster(root, |
6330 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
6331 | goto checks; |
6332 | } | |
6333 | ||
274bd4fb AO |
6334 | WARN_ON(last_ptr->block_group != used_block_group); |
6335 | if (used_block_group != block_group) { | |
6336 | btrfs_put_block_group(used_block_group); | |
6337 | used_block_group = block_group; | |
fa9c0d79 | 6338 | } |
44fb5511 | 6339 | refill_cluster: |
274bd4fb | 6340 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
6341 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
6342 | * set up a new clusters, so lets just skip it | |
6343 | * and let the allocator find whatever block | |
6344 | * it can find. If we reach this point, we | |
6345 | * will have tried the cluster allocator | |
6346 | * plenty of times and not have found | |
6347 | * anything, so we are likely way too | |
6348 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
6349 | * anything. |
6350 | * | |
6351 | * However, if the cluster is taken from the | |
6352 | * current block group, release the cluster | |
6353 | * first, so that we stand a better chance of | |
6354 | * succeeding in the unclustered | |
6355 | * allocation. */ | |
6356 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6357 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
6358 | spin_unlock(&last_ptr->refill_lock); |
6359 | goto unclustered_alloc; | |
6360 | } | |
6361 | ||
fa9c0d79 CM |
6362 | /* |
6363 | * this cluster didn't work out, free it and | |
6364 | * start over | |
6365 | */ | |
6366 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6367 | ||
a5f6f719 AO |
6368 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
6369 | spin_unlock(&last_ptr->refill_lock); | |
6370 | goto unclustered_alloc; | |
6371 | } | |
6372 | ||
8de972b4 CM |
6373 | aligned_cluster = max_t(unsigned long, |
6374 | empty_cluster + empty_size, | |
6375 | block_group->full_stripe_len); | |
6376 | ||
fa9c0d79 | 6377 | /* allocate a cluster in this block group */ |
00361589 JB |
6378 | ret = btrfs_find_space_cluster(root, block_group, |
6379 | last_ptr, search_start, | |
6380 | num_bytes, | |
6381 | aligned_cluster); | |
fa9c0d79 CM |
6382 | if (ret == 0) { |
6383 | /* | |
6384 | * now pull our allocation out of this | |
6385 | * cluster | |
6386 | */ | |
6387 | offset = btrfs_alloc_from_cluster(block_group, | |
a4820398 MX |
6388 | last_ptr, |
6389 | num_bytes, | |
6390 | search_start, | |
6391 | &max_extent_size); | |
fa9c0d79 CM |
6392 | if (offset) { |
6393 | /* we found one, proceed */ | |
6394 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6395 | trace_btrfs_reserve_extent_cluster(root, |
6396 | block_group, search_start, | |
6397 | num_bytes); | |
fa9c0d79 CM |
6398 | goto checks; |
6399 | } | |
0a24325e JB |
6400 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6401 | && !failed_cluster_refill) { | |
817d52f8 JB |
6402 | spin_unlock(&last_ptr->refill_lock); |
6403 | ||
0a24325e | 6404 | failed_cluster_refill = true; |
817d52f8 JB |
6405 | wait_block_group_cache_progress(block_group, |
6406 | num_bytes + empty_cluster + empty_size); | |
6407 | goto have_block_group; | |
fa9c0d79 | 6408 | } |
817d52f8 | 6409 | |
fa9c0d79 CM |
6410 | /* |
6411 | * at this point we either didn't find a cluster | |
6412 | * or we weren't able to allocate a block from our | |
6413 | * cluster. Free the cluster we've been trying | |
6414 | * to use, and go to the next block group | |
6415 | */ | |
0a24325e | 6416 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6417 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6418 | goto loop; |
fa9c0d79 CM |
6419 | } |
6420 | ||
062c05c4 | 6421 | unclustered_alloc: |
a5f6f719 AO |
6422 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6423 | if (cached && | |
6424 | block_group->free_space_ctl->free_space < | |
6425 | num_bytes + empty_cluster + empty_size) { | |
a4820398 MX |
6426 | if (block_group->free_space_ctl->free_space > |
6427 | max_extent_size) | |
6428 | max_extent_size = | |
6429 | block_group->free_space_ctl->free_space; | |
a5f6f719 AO |
6430 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
6431 | goto loop; | |
6432 | } | |
6433 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6434 | ||
6226cb0a | 6435 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
a4820398 MX |
6436 | num_bytes, empty_size, |
6437 | &max_extent_size); | |
1cdda9b8 JB |
6438 | /* |
6439 | * If we didn't find a chunk, and we haven't failed on this | |
6440 | * block group before, and this block group is in the middle of | |
6441 | * caching and we are ok with waiting, then go ahead and wait | |
6442 | * for progress to be made, and set failed_alloc to true. | |
6443 | * | |
6444 | * If failed_alloc is true then we've already waited on this | |
6445 | * block group once and should move on to the next block group. | |
6446 | */ | |
6447 | if (!offset && !failed_alloc && !cached && | |
6448 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6449 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6450 | num_bytes + empty_size); |
6451 | failed_alloc = true; | |
817d52f8 | 6452 | goto have_block_group; |
1cdda9b8 | 6453 | } else if (!offset) { |
60d2adbb MX |
6454 | if (!cached) |
6455 | have_caching_bg = true; | |
1cdda9b8 | 6456 | goto loop; |
817d52f8 | 6457 | } |
fa9c0d79 | 6458 | checks: |
53b381b3 DW |
6459 | search_start = stripe_align(root, used_block_group, |
6460 | offset, num_bytes); | |
25179201 | 6461 | |
2552d17e JB |
6462 | /* move on to the next group */ |
6463 | if (search_start + num_bytes > | |
274bd4fb AO |
6464 | used_block_group->key.objectid + used_block_group->key.offset) { |
6465 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 6466 | goto loop; |
6226cb0a | 6467 | } |
f5a31e16 | 6468 | |
f0486c68 | 6469 | if (offset < search_start) |
274bd4fb | 6470 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
6471 | search_start - offset); |
6472 | BUG_ON(offset > search_start); | |
2552d17e | 6473 | |
274bd4fb | 6474 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 6475 | alloc_type); |
f0486c68 | 6476 | if (ret == -EAGAIN) { |
274bd4fb | 6477 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 6478 | goto loop; |
0f9dd46c | 6479 | } |
0b86a832 | 6480 | |
f0486c68 | 6481 | /* we are all good, lets return */ |
2552d17e JB |
6482 | ins->objectid = search_start; |
6483 | ins->offset = num_bytes; | |
d2fb3437 | 6484 | |
3f7de037 JB |
6485 | trace_btrfs_reserve_extent(orig_root, block_group, |
6486 | search_start, num_bytes); | |
274bd4fb AO |
6487 | if (used_block_group != block_group) |
6488 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 6489 | btrfs_put_block_group(block_group); |
2552d17e JB |
6490 | break; |
6491 | loop: | |
0a24325e | 6492 | failed_cluster_refill = false; |
1cdda9b8 | 6493 | failed_alloc = false; |
b742bb82 | 6494 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
6495 | if (used_block_group != block_group) |
6496 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 6497 | btrfs_put_block_group(block_group); |
2552d17e JB |
6498 | } |
6499 | up_read(&space_info->groups_sem); | |
6500 | ||
60d2adbb MX |
6501 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6502 | goto search; | |
6503 | ||
b742bb82 YZ |
6504 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6505 | goto search; | |
6506 | ||
285ff5af | 6507 | /* |
ccf0e725 JB |
6508 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6509 | * caching kthreads as we move along | |
817d52f8 JB |
6510 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6511 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6512 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6513 | * again | |
fa9c0d79 | 6514 | */ |
723bda20 | 6515 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6516 | index = 0; |
723bda20 | 6517 | loop++; |
817d52f8 | 6518 | if (loop == LOOP_ALLOC_CHUNK) { |
00361589 JB |
6519 | struct btrfs_trans_handle *trans; |
6520 | ||
6521 | trans = btrfs_join_transaction(root); | |
6522 | if (IS_ERR(trans)) { | |
6523 | ret = PTR_ERR(trans); | |
6524 | goto out; | |
6525 | } | |
6526 | ||
b6919a58 | 6527 | ret = do_chunk_alloc(trans, root, flags, |
ea658bad JB |
6528 | CHUNK_ALLOC_FORCE); |
6529 | /* | |
6530 | * Do not bail out on ENOSPC since we | |
6531 | * can do more things. | |
6532 | */ | |
00361589 | 6533 | if (ret < 0 && ret != -ENOSPC) |
ea658bad JB |
6534 | btrfs_abort_transaction(trans, |
6535 | root, ret); | |
00361589 JB |
6536 | else |
6537 | ret = 0; | |
6538 | btrfs_end_transaction(trans, root); | |
6539 | if (ret) | |
ea658bad | 6540 | goto out; |
2552d17e JB |
6541 | } |
6542 | ||
723bda20 JB |
6543 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6544 | empty_size = 0; | |
6545 | empty_cluster = 0; | |
fa9c0d79 | 6546 | } |
723bda20 JB |
6547 | |
6548 | goto search; | |
2552d17e JB |
6549 | } else if (!ins->objectid) { |
6550 | ret = -ENOSPC; | |
d82a6f1d | 6551 | } else if (ins->objectid) { |
80eb234a | 6552 | ret = 0; |
be744175 | 6553 | } |
79787eaa | 6554 | out: |
a4820398 MX |
6555 | if (ret == -ENOSPC) |
6556 | ins->offset = max_extent_size; | |
0f70abe2 | 6557 | return ret; |
fec577fb | 6558 | } |
ec44a35c | 6559 | |
9ed74f2d JB |
6560 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6561 | int dump_block_groups) | |
0f9dd46c JB |
6562 | { |
6563 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6564 | int index = 0; |
0f9dd46c | 6565 | |
9ed74f2d | 6566 | spin_lock(&info->lock); |
efe120a0 | 6567 | printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n", |
c1c9ff7c GU |
6568 | info->flags, |
6569 | info->total_bytes - info->bytes_used - info->bytes_pinned - | |
6570 | info->bytes_reserved - info->bytes_readonly, | |
d397712b | 6571 | (info->full) ? "" : "not "); |
efe120a0 | 6572 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " |
8929ecfa | 6573 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
c1c9ff7c GU |
6574 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
6575 | info->bytes_reserved, info->bytes_may_use, | |
6576 | info->bytes_readonly); | |
9ed74f2d JB |
6577 | spin_unlock(&info->lock); |
6578 | ||
6579 | if (!dump_block_groups) | |
6580 | return; | |
0f9dd46c | 6581 | |
80eb234a | 6582 | down_read(&info->groups_sem); |
b742bb82 YZ |
6583 | again: |
6584 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6585 | spin_lock(&cache->lock); |
efe120a0 FH |
6586 | printk(KERN_INFO "BTRFS: " |
6587 | "block group %llu has %llu bytes, " | |
6588 | "%llu used %llu pinned %llu reserved %s\n", | |
c1c9ff7c GU |
6589 | cache->key.objectid, cache->key.offset, |
6590 | btrfs_block_group_used(&cache->item), cache->pinned, | |
6591 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6592 | btrfs_dump_free_space(cache, bytes); |
6593 | spin_unlock(&cache->lock); | |
6594 | } | |
b742bb82 YZ |
6595 | if (++index < BTRFS_NR_RAID_TYPES) |
6596 | goto again; | |
80eb234a | 6597 | up_read(&info->groups_sem); |
0f9dd46c | 6598 | } |
e8569813 | 6599 | |
00361589 | 6600 | int btrfs_reserve_extent(struct btrfs_root *root, |
11833d66 YZ |
6601 | u64 num_bytes, u64 min_alloc_size, |
6602 | u64 empty_size, u64 hint_byte, | |
b6919a58 | 6603 | struct btrfs_key *ins, int is_data) |
fec577fb | 6604 | { |
9e622d6b | 6605 | bool final_tried = false; |
b6919a58 | 6606 | u64 flags; |
fec577fb | 6607 | int ret; |
925baedd | 6608 | |
b6919a58 | 6609 | flags = btrfs_get_alloc_profile(root, is_data); |
98d20f67 | 6610 | again: |
db94535d | 6611 | WARN_ON(num_bytes < root->sectorsize); |
00361589 JB |
6612 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
6613 | flags); | |
3b951516 | 6614 | |
9e622d6b | 6615 | if (ret == -ENOSPC) { |
a4820398 MX |
6616 | if (!final_tried && ins->offset) { |
6617 | num_bytes = min(num_bytes >> 1, ins->offset); | |
24542bf7 | 6618 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6619 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6620 | if (num_bytes == min_alloc_size) |
6621 | final_tried = true; | |
6622 | goto again; | |
6623 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6624 | struct btrfs_space_info *sinfo; | |
6625 | ||
b6919a58 | 6626 | sinfo = __find_space_info(root->fs_info, flags); |
c2cf52eb | 6627 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
c1c9ff7c | 6628 | flags, num_bytes); |
53804280 JM |
6629 | if (sinfo) |
6630 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6631 | } |
925baedd | 6632 | } |
0f9dd46c JB |
6633 | |
6634 | return ret; | |
e6dcd2dc CM |
6635 | } |
6636 | ||
e688b725 CM |
6637 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6638 | u64 start, u64 len, int pin) | |
65b51a00 | 6639 | { |
0f9dd46c | 6640 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6641 | int ret = 0; |
0f9dd46c | 6642 | |
0f9dd46c JB |
6643 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6644 | if (!cache) { | |
c2cf52eb | 6645 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
c1c9ff7c | 6646 | start); |
0f9dd46c JB |
6647 | return -ENOSPC; |
6648 | } | |
1f3c79a2 | 6649 | |
5378e607 LD |
6650 | if (btrfs_test_opt(root, DISCARD)) |
6651 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6652 | |
e688b725 CM |
6653 | if (pin) |
6654 | pin_down_extent(root, cache, start, len, 1); | |
6655 | else { | |
6656 | btrfs_add_free_space(cache, start, len); | |
6657 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6658 | } | |
fa9c0d79 | 6659 | btrfs_put_block_group(cache); |
817d52f8 | 6660 | |
1abe9b8a | 6661 | trace_btrfs_reserved_extent_free(root, start, len); |
6662 | ||
e6dcd2dc CM |
6663 | return ret; |
6664 | } | |
6665 | ||
e688b725 CM |
6666 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6667 | u64 start, u64 len) | |
6668 | { | |
6669 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6670 | } | |
6671 | ||
6672 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6673 | u64 start, u64 len) | |
6674 | { | |
6675 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6676 | } | |
6677 | ||
5d4f98a2 YZ |
6678 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6679 | struct btrfs_root *root, | |
6680 | u64 parent, u64 root_objectid, | |
6681 | u64 flags, u64 owner, u64 offset, | |
6682 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6683 | { |
6684 | int ret; | |
5d4f98a2 | 6685 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6686 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6687 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6688 | struct btrfs_path *path; |
5d4f98a2 YZ |
6689 | struct extent_buffer *leaf; |
6690 | int type; | |
6691 | u32 size; | |
26b8003f | 6692 | |
5d4f98a2 YZ |
6693 | if (parent > 0) |
6694 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6695 | else | |
6696 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6697 | |
5d4f98a2 | 6698 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6699 | |
6700 | path = btrfs_alloc_path(); | |
db5b493a TI |
6701 | if (!path) |
6702 | return -ENOMEM; | |
47e4bb98 | 6703 | |
b9473439 | 6704 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6705 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6706 | ins, size); | |
79787eaa JM |
6707 | if (ret) { |
6708 | btrfs_free_path(path); | |
6709 | return ret; | |
6710 | } | |
0f9dd46c | 6711 | |
5d4f98a2 YZ |
6712 | leaf = path->nodes[0]; |
6713 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6714 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6715 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6716 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6717 | btrfs_set_extent_flags(leaf, extent_item, | |
6718 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6719 | ||
6720 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6721 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6722 | if (parent > 0) { | |
6723 | struct btrfs_shared_data_ref *ref; | |
6724 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6725 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6726 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6727 | } else { | |
6728 | struct btrfs_extent_data_ref *ref; | |
6729 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6730 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6731 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6732 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6733 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6734 | } | |
47e4bb98 CM |
6735 | |
6736 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6737 | btrfs_free_path(path); |
f510cfec | 6738 | |
c53d613e | 6739 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6740 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 6741 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 6742 | ins->objectid, ins->offset); |
f5947066 CM |
6743 | BUG(); |
6744 | } | |
0be5dc67 | 6745 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
e6dcd2dc CM |
6746 | return ret; |
6747 | } | |
6748 | ||
5d4f98a2 YZ |
6749 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6750 | struct btrfs_root *root, | |
6751 | u64 parent, u64 root_objectid, | |
6752 | u64 flags, struct btrfs_disk_key *key, | |
6753 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6754 | { |
6755 | int ret; | |
5d4f98a2 YZ |
6756 | struct btrfs_fs_info *fs_info = root->fs_info; |
6757 | struct btrfs_extent_item *extent_item; | |
6758 | struct btrfs_tree_block_info *block_info; | |
6759 | struct btrfs_extent_inline_ref *iref; | |
6760 | struct btrfs_path *path; | |
6761 | struct extent_buffer *leaf; | |
3173a18f JB |
6762 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
6763 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6764 | SKINNY_METADATA); | |
6765 | ||
6766 | if (!skinny_metadata) | |
6767 | size += sizeof(*block_info); | |
1c2308f8 | 6768 | |
5d4f98a2 | 6769 | path = btrfs_alloc_path(); |
857cc2fc JB |
6770 | if (!path) { |
6771 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, | |
6772 | root->leafsize); | |
d8926bb3 | 6773 | return -ENOMEM; |
857cc2fc | 6774 | } |
56bec294 | 6775 | |
5d4f98a2 YZ |
6776 | path->leave_spinning = 1; |
6777 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6778 | ins, size); | |
79787eaa | 6779 | if (ret) { |
857cc2fc JB |
6780 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
6781 | root->leafsize); | |
79787eaa JM |
6782 | btrfs_free_path(path); |
6783 | return ret; | |
6784 | } | |
5d4f98a2 YZ |
6785 | |
6786 | leaf = path->nodes[0]; | |
6787 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6788 | struct btrfs_extent_item); | |
6789 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6790 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6791 | btrfs_set_extent_flags(leaf, extent_item, | |
6792 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 6793 | |
3173a18f JB |
6794 | if (skinny_metadata) { |
6795 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6796 | } else { | |
6797 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6798 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6799 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6800 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6801 | } | |
5d4f98a2 | 6802 | |
5d4f98a2 YZ |
6803 | if (parent > 0) { |
6804 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6805 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6806 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6807 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6808 | } else { | |
6809 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6810 | BTRFS_TREE_BLOCK_REF_KEY); | |
6811 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6812 | } | |
6813 | ||
6814 | btrfs_mark_buffer_dirty(leaf); | |
6815 | btrfs_free_path(path); | |
6816 | ||
3173a18f | 6817 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
79787eaa | 6818 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 6819 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 6820 | ins->objectid, ins->offset); |
5d4f98a2 YZ |
6821 | BUG(); |
6822 | } | |
0be5dc67 JB |
6823 | |
6824 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->leafsize); | |
5d4f98a2 YZ |
6825 | return ret; |
6826 | } | |
6827 | ||
6828 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6829 | struct btrfs_root *root, | |
6830 | u64 root_objectid, u64 owner, | |
6831 | u64 offset, struct btrfs_key *ins) | |
6832 | { | |
6833 | int ret; | |
6834 | ||
6835 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6836 | ||
66d7e7f0 AJ |
6837 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6838 | ins->offset, 0, | |
6839 | root_objectid, owner, offset, | |
6840 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6841 | return ret; |
6842 | } | |
e02119d5 CM |
6843 | |
6844 | /* | |
6845 | * this is used by the tree logging recovery code. It records that | |
6846 | * an extent has been allocated and makes sure to clear the free | |
6847 | * space cache bits as well | |
6848 | */ | |
5d4f98a2 YZ |
6849 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6850 | struct btrfs_root *root, | |
6851 | u64 root_objectid, u64 owner, u64 offset, | |
6852 | struct btrfs_key *ins) | |
e02119d5 CM |
6853 | { |
6854 | int ret; | |
6855 | struct btrfs_block_group_cache *block_group; | |
11833d66 | 6856 | |
8c2a1a30 JB |
6857 | /* |
6858 | * Mixed block groups will exclude before processing the log so we only | |
6859 | * need to do the exlude dance if this fs isn't mixed. | |
6860 | */ | |
6861 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
6862 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
b50c6e25 | 6863 | if (ret) |
8c2a1a30 | 6864 | return ret; |
11833d66 YZ |
6865 | } |
6866 | ||
8c2a1a30 JB |
6867 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
6868 | if (!block_group) | |
6869 | return -EINVAL; | |
6870 | ||
fb25e914 JB |
6871 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6872 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6873 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
6874 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6875 | 0, owner, offset, ins, 1); | |
b50c6e25 | 6876 | btrfs_put_block_group(block_group); |
e02119d5 CM |
6877 | return ret; |
6878 | } | |
6879 | ||
48a3b636 ES |
6880 | static struct extent_buffer * |
6881 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
6882 | u64 bytenr, u32 blocksize, int level) | |
65b51a00 CM |
6883 | { |
6884 | struct extent_buffer *buf; | |
6885 | ||
6886 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6887 | if (!buf) | |
6888 | return ERR_PTR(-ENOMEM); | |
6889 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6890 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6891 | btrfs_tree_lock(buf); |
6892 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6893 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6894 | |
6895 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6896 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6897 | |
d0c803c4 | 6898 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6899 | /* |
6900 | * we allow two log transactions at a time, use different | |
6901 | * EXENT bit to differentiate dirty pages. | |
6902 | */ | |
6903 | if (root->log_transid % 2 == 0) | |
6904 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6905 | buf->start + buf->len - 1, GFP_NOFS); | |
6906 | else | |
6907 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6908 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6909 | } else { |
6910 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6911 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6912 | } |
65b51a00 | 6913 | trans->blocks_used++; |
b4ce94de | 6914 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6915 | return buf; |
6916 | } | |
6917 | ||
f0486c68 YZ |
6918 | static struct btrfs_block_rsv * |
6919 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6920 | struct btrfs_root *root, u32 blocksize) | |
6921 | { | |
6922 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6923 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 | 6924 | int ret; |
d88033db | 6925 | bool global_updated = false; |
f0486c68 YZ |
6926 | |
6927 | block_rsv = get_block_rsv(trans, root); | |
6928 | ||
b586b323 MX |
6929 | if (unlikely(block_rsv->size == 0)) |
6930 | goto try_reserve; | |
d88033db | 6931 | again: |
f0486c68 YZ |
6932 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
6933 | if (!ret) | |
6934 | return block_rsv; | |
6935 | ||
b586b323 MX |
6936 | if (block_rsv->failfast) |
6937 | return ERR_PTR(ret); | |
6938 | ||
d88033db MX |
6939 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
6940 | global_updated = true; | |
6941 | update_global_block_rsv(root->fs_info); | |
6942 | goto again; | |
6943 | } | |
6944 | ||
b586b323 MX |
6945 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6946 | static DEFINE_RATELIMIT_STATE(_rs, | |
6947 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6948 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6949 | if (__ratelimit(&_rs)) | |
6950 | WARN(1, KERN_DEBUG | |
efe120a0 | 6951 | "BTRFS: block rsv returned %d\n", ret); |
b586b323 MX |
6952 | } |
6953 | try_reserve: | |
6954 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
6955 | BTRFS_RESERVE_NO_FLUSH); | |
6956 | if (!ret) | |
6957 | return block_rsv; | |
6958 | /* | |
6959 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
6960 | * the global reserve if its space type is the same as the global |
6961 | * reservation. | |
b586b323 | 6962 | */ |
5881cfc9 MX |
6963 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
6964 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
6965 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
6966 | if (!ret) | |
6967 | return global_rsv; | |
6968 | } | |
6969 | return ERR_PTR(ret); | |
f0486c68 YZ |
6970 | } |
6971 | ||
8c2a3ca2 JB |
6972 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6973 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6974 | { |
6975 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6976 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6977 | } |
6978 | ||
fec577fb | 6979 | /* |
f0486c68 YZ |
6980 | * finds a free extent and does all the dirty work required for allocation |
6981 | * returns the key for the extent through ins, and a tree buffer for | |
6982 | * the first block of the extent through buf. | |
6983 | * | |
fec577fb CM |
6984 | * returns the tree buffer or NULL. |
6985 | */ | |
5f39d397 | 6986 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6987 | struct btrfs_root *root, u32 blocksize, |
6988 | u64 parent, u64 root_objectid, | |
6989 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6990 | u64 hint, u64 empty_size) |
fec577fb | 6991 | { |
e2fa7227 | 6992 | struct btrfs_key ins; |
f0486c68 | 6993 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6994 | struct extent_buffer *buf; |
f0486c68 YZ |
6995 | u64 flags = 0; |
6996 | int ret; | |
3173a18f JB |
6997 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6998 | SKINNY_METADATA); | |
fec577fb | 6999 | |
f0486c68 YZ |
7000 | block_rsv = use_block_rsv(trans, root, blocksize); |
7001 | if (IS_ERR(block_rsv)) | |
7002 | return ERR_CAST(block_rsv); | |
7003 | ||
00361589 | 7004 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
81c9ad23 | 7005 | empty_size, hint, &ins, 0); |
fec577fb | 7006 | if (ret) { |
8c2a3ca2 | 7007 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 7008 | return ERR_PTR(ret); |
fec577fb | 7009 | } |
55c69072 | 7010 | |
4008c04a CM |
7011 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
7012 | blocksize, level); | |
79787eaa | 7013 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
7014 | |
7015 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
7016 | if (parent == 0) | |
7017 | parent = ins.objectid; | |
7018 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7019 | } else | |
7020 | BUG_ON(parent > 0); | |
7021 | ||
7022 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
7023 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 7024 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 7025 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
7026 | if (key) |
7027 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
7028 | else | |
7029 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
7030 | extent_op->flags_to_set = flags; | |
3173a18f JB |
7031 | if (skinny_metadata) |
7032 | extent_op->update_key = 0; | |
7033 | else | |
7034 | extent_op->update_key = 1; | |
f0486c68 YZ |
7035 | extent_op->update_flags = 1; |
7036 | extent_op->is_data = 0; | |
b1c79e09 | 7037 | extent_op->level = level; |
f0486c68 | 7038 | |
66d7e7f0 AJ |
7039 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
7040 | ins.objectid, | |
f0486c68 YZ |
7041 | ins.offset, parent, root_objectid, |
7042 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 7043 | extent_op, 0); |
79787eaa | 7044 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 7045 | } |
fec577fb CM |
7046 | return buf; |
7047 | } | |
a28ec197 | 7048 | |
2c47e605 YZ |
7049 | struct walk_control { |
7050 | u64 refs[BTRFS_MAX_LEVEL]; | |
7051 | u64 flags[BTRFS_MAX_LEVEL]; | |
7052 | struct btrfs_key update_progress; | |
7053 | int stage; | |
7054 | int level; | |
7055 | int shared_level; | |
7056 | int update_ref; | |
7057 | int keep_locks; | |
1c4850e2 YZ |
7058 | int reada_slot; |
7059 | int reada_count; | |
66d7e7f0 | 7060 | int for_reloc; |
2c47e605 YZ |
7061 | }; |
7062 | ||
7063 | #define DROP_REFERENCE 1 | |
7064 | #define UPDATE_BACKREF 2 | |
7065 | ||
1c4850e2 YZ |
7066 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
7067 | struct btrfs_root *root, | |
7068 | struct walk_control *wc, | |
7069 | struct btrfs_path *path) | |
6407bf6d | 7070 | { |
1c4850e2 YZ |
7071 | u64 bytenr; |
7072 | u64 generation; | |
7073 | u64 refs; | |
94fcca9f | 7074 | u64 flags; |
5d4f98a2 | 7075 | u32 nritems; |
1c4850e2 YZ |
7076 | u32 blocksize; |
7077 | struct btrfs_key key; | |
7078 | struct extent_buffer *eb; | |
6407bf6d | 7079 | int ret; |
1c4850e2 YZ |
7080 | int slot; |
7081 | int nread = 0; | |
6407bf6d | 7082 | |
1c4850e2 YZ |
7083 | if (path->slots[wc->level] < wc->reada_slot) { |
7084 | wc->reada_count = wc->reada_count * 2 / 3; | |
7085 | wc->reada_count = max(wc->reada_count, 2); | |
7086 | } else { | |
7087 | wc->reada_count = wc->reada_count * 3 / 2; | |
7088 | wc->reada_count = min_t(int, wc->reada_count, | |
7089 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
7090 | } | |
7bb86316 | 7091 | |
1c4850e2 YZ |
7092 | eb = path->nodes[wc->level]; |
7093 | nritems = btrfs_header_nritems(eb); | |
7094 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 7095 | |
1c4850e2 YZ |
7096 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
7097 | if (nread >= wc->reada_count) | |
7098 | break; | |
bd56b302 | 7099 | |
2dd3e67b | 7100 | cond_resched(); |
1c4850e2 YZ |
7101 | bytenr = btrfs_node_blockptr(eb, slot); |
7102 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 7103 | |
1c4850e2 YZ |
7104 | if (slot == path->slots[wc->level]) |
7105 | goto reada; | |
5d4f98a2 | 7106 | |
1c4850e2 YZ |
7107 | if (wc->stage == UPDATE_BACKREF && |
7108 | generation <= root->root_key.offset) | |
bd56b302 CM |
7109 | continue; |
7110 | ||
94fcca9f | 7111 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
7112 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
7113 | wc->level - 1, 1, &refs, | |
7114 | &flags); | |
79787eaa JM |
7115 | /* We don't care about errors in readahead. */ |
7116 | if (ret < 0) | |
7117 | continue; | |
94fcca9f YZ |
7118 | BUG_ON(refs == 0); |
7119 | ||
1c4850e2 | 7120 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
7121 | if (refs == 1) |
7122 | goto reada; | |
bd56b302 | 7123 | |
94fcca9f YZ |
7124 | if (wc->level == 1 && |
7125 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7126 | continue; | |
1c4850e2 YZ |
7127 | if (!wc->update_ref || |
7128 | generation <= root->root_key.offset) | |
7129 | continue; | |
7130 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7131 | ret = btrfs_comp_cpu_keys(&key, | |
7132 | &wc->update_progress); | |
7133 | if (ret < 0) | |
7134 | continue; | |
94fcca9f YZ |
7135 | } else { |
7136 | if (wc->level == 1 && | |
7137 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7138 | continue; | |
6407bf6d | 7139 | } |
1c4850e2 YZ |
7140 | reada: |
7141 | ret = readahead_tree_block(root, bytenr, blocksize, | |
7142 | generation); | |
7143 | if (ret) | |
bd56b302 | 7144 | break; |
1c4850e2 | 7145 | nread++; |
20524f02 | 7146 | } |
1c4850e2 | 7147 | wc->reada_slot = slot; |
20524f02 | 7148 | } |
2c47e605 | 7149 | |
f82d02d9 | 7150 | /* |
2c016dc2 | 7151 | * helper to process tree block while walking down the tree. |
2c47e605 | 7152 | * |
2c47e605 YZ |
7153 | * when wc->stage == UPDATE_BACKREF, this function updates |
7154 | * back refs for pointers in the block. | |
7155 | * | |
7156 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 7157 | */ |
2c47e605 | 7158 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 7159 | struct btrfs_root *root, |
2c47e605 | 7160 | struct btrfs_path *path, |
94fcca9f | 7161 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 7162 | { |
2c47e605 YZ |
7163 | int level = wc->level; |
7164 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 7165 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
7166 | int ret; |
7167 | ||
2c47e605 YZ |
7168 | if (wc->stage == UPDATE_BACKREF && |
7169 | btrfs_header_owner(eb) != root->root_key.objectid) | |
7170 | return 1; | |
f82d02d9 | 7171 | |
2c47e605 YZ |
7172 | /* |
7173 | * when reference count of tree block is 1, it won't increase | |
7174 | * again. once full backref flag is set, we never clear it. | |
7175 | */ | |
94fcca9f YZ |
7176 | if (lookup_info && |
7177 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
7178 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
7179 | BUG_ON(!path->locks[level]); |
7180 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7181 | eb->start, level, 1, |
2c47e605 YZ |
7182 | &wc->refs[level], |
7183 | &wc->flags[level]); | |
79787eaa JM |
7184 | BUG_ON(ret == -ENOMEM); |
7185 | if (ret) | |
7186 | return ret; | |
2c47e605 YZ |
7187 | BUG_ON(wc->refs[level] == 0); |
7188 | } | |
5d4f98a2 | 7189 | |
2c47e605 YZ |
7190 | if (wc->stage == DROP_REFERENCE) { |
7191 | if (wc->refs[level] > 1) | |
7192 | return 1; | |
f82d02d9 | 7193 | |
2c47e605 | 7194 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 7195 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7196 | path->locks[level] = 0; |
7197 | } | |
7198 | return 0; | |
7199 | } | |
f82d02d9 | 7200 | |
2c47e605 YZ |
7201 | /* wc->stage == UPDATE_BACKREF */ |
7202 | if (!(wc->flags[level] & flag)) { | |
7203 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 7204 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 7205 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 7206 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 7207 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 | 7208 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
b1c79e09 JB |
7209 | eb->len, flag, |
7210 | btrfs_header_level(eb), 0); | |
79787eaa | 7211 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7212 | wc->flags[level] |= flag; |
7213 | } | |
7214 | ||
7215 | /* | |
7216 | * the block is shared by multiple trees, so it's not good to | |
7217 | * keep the tree lock | |
7218 | */ | |
7219 | if (path->locks[level] && level > 0) { | |
bd681513 | 7220 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7221 | path->locks[level] = 0; |
7222 | } | |
7223 | return 0; | |
7224 | } | |
7225 | ||
1c4850e2 | 7226 | /* |
2c016dc2 | 7227 | * helper to process tree block pointer. |
1c4850e2 YZ |
7228 | * |
7229 | * when wc->stage == DROP_REFERENCE, this function checks | |
7230 | * reference count of the block pointed to. if the block | |
7231 | * is shared and we need update back refs for the subtree | |
7232 | * rooted at the block, this function changes wc->stage to | |
7233 | * UPDATE_BACKREF. if the block is shared and there is no | |
7234 | * need to update back, this function drops the reference | |
7235 | * to the block. | |
7236 | * | |
7237 | * NOTE: return value 1 means we should stop walking down. | |
7238 | */ | |
7239 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
7240 | struct btrfs_root *root, | |
7241 | struct btrfs_path *path, | |
94fcca9f | 7242 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
7243 | { |
7244 | u64 bytenr; | |
7245 | u64 generation; | |
7246 | u64 parent; | |
7247 | u32 blocksize; | |
7248 | struct btrfs_key key; | |
7249 | struct extent_buffer *next; | |
7250 | int level = wc->level; | |
7251 | int reada = 0; | |
7252 | int ret = 0; | |
7253 | ||
7254 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
7255 | path->slots[level]); | |
7256 | /* | |
7257 | * if the lower level block was created before the snapshot | |
7258 | * was created, we know there is no need to update back refs | |
7259 | * for the subtree | |
7260 | */ | |
7261 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
7262 | generation <= root->root_key.offset) { |
7263 | *lookup_info = 1; | |
1c4850e2 | 7264 | return 1; |
94fcca9f | 7265 | } |
1c4850e2 YZ |
7266 | |
7267 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
7268 | blocksize = btrfs_level_size(root, level - 1); | |
7269 | ||
7270 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
7271 | if (!next) { | |
7272 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
7273 | if (!next) |
7274 | return -ENOMEM; | |
b2aaaa3b JB |
7275 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
7276 | level - 1); | |
1c4850e2 YZ |
7277 | reada = 1; |
7278 | } | |
7279 | btrfs_tree_lock(next); | |
7280 | btrfs_set_lock_blocking(next); | |
7281 | ||
3173a18f | 7282 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
7283 | &wc->refs[level - 1], |
7284 | &wc->flags[level - 1]); | |
79787eaa JM |
7285 | if (ret < 0) { |
7286 | btrfs_tree_unlock(next); | |
7287 | return ret; | |
7288 | } | |
7289 | ||
c2cf52eb SK |
7290 | if (unlikely(wc->refs[level - 1] == 0)) { |
7291 | btrfs_err(root->fs_info, "Missing references."); | |
7292 | BUG(); | |
7293 | } | |
94fcca9f | 7294 | *lookup_info = 0; |
1c4850e2 | 7295 | |
94fcca9f | 7296 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 7297 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
7298 | if (level == 1 && |
7299 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7300 | goto skip; | |
7301 | ||
1c4850e2 YZ |
7302 | if (!wc->update_ref || |
7303 | generation <= root->root_key.offset) | |
7304 | goto skip; | |
7305 | ||
7306 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
7307 | path->slots[level]); | |
7308 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
7309 | if (ret < 0) | |
7310 | goto skip; | |
7311 | ||
7312 | wc->stage = UPDATE_BACKREF; | |
7313 | wc->shared_level = level - 1; | |
7314 | } | |
94fcca9f YZ |
7315 | } else { |
7316 | if (level == 1 && | |
7317 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7318 | goto skip; | |
1c4850e2 YZ |
7319 | } |
7320 | ||
b9fab919 | 7321 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
7322 | btrfs_tree_unlock(next); |
7323 | free_extent_buffer(next); | |
7324 | next = NULL; | |
94fcca9f | 7325 | *lookup_info = 1; |
1c4850e2 YZ |
7326 | } |
7327 | ||
7328 | if (!next) { | |
7329 | if (reada && level == 1) | |
7330 | reada_walk_down(trans, root, wc, path); | |
7331 | next = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
7332 | if (!next || !extent_buffer_uptodate(next)) { |
7333 | free_extent_buffer(next); | |
97d9a8a4 | 7334 | return -EIO; |
416bc658 | 7335 | } |
1c4850e2 YZ |
7336 | btrfs_tree_lock(next); |
7337 | btrfs_set_lock_blocking(next); | |
7338 | } | |
7339 | ||
7340 | level--; | |
7341 | BUG_ON(level != btrfs_header_level(next)); | |
7342 | path->nodes[level] = next; | |
7343 | path->slots[level] = 0; | |
bd681513 | 7344 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
7345 | wc->level = level; |
7346 | if (wc->level == 1) | |
7347 | wc->reada_slot = 0; | |
7348 | return 0; | |
7349 | skip: | |
7350 | wc->refs[level - 1] = 0; | |
7351 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
7352 | if (wc->stage == DROP_REFERENCE) { |
7353 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
7354 | parent = path->nodes[level]->start; | |
7355 | } else { | |
7356 | BUG_ON(root->root_key.objectid != | |
7357 | btrfs_header_owner(path->nodes[level])); | |
7358 | parent = 0; | |
7359 | } | |
1c4850e2 | 7360 | |
94fcca9f | 7361 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 7362 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 7363 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 7364 | } |
1c4850e2 YZ |
7365 | btrfs_tree_unlock(next); |
7366 | free_extent_buffer(next); | |
94fcca9f | 7367 | *lookup_info = 1; |
1c4850e2 YZ |
7368 | return 1; |
7369 | } | |
7370 | ||
2c47e605 | 7371 | /* |
2c016dc2 | 7372 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
7373 | * |
7374 | * when wc->stage == DROP_REFERENCE, this function drops | |
7375 | * reference count on the block. | |
7376 | * | |
7377 | * when wc->stage == UPDATE_BACKREF, this function changes | |
7378 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
7379 | * to UPDATE_BACKREF previously while processing the block. | |
7380 | * | |
7381 | * NOTE: return value 1 means we should stop walking up. | |
7382 | */ | |
7383 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
7384 | struct btrfs_root *root, | |
7385 | struct btrfs_path *path, | |
7386 | struct walk_control *wc) | |
7387 | { | |
f0486c68 | 7388 | int ret; |
2c47e605 YZ |
7389 | int level = wc->level; |
7390 | struct extent_buffer *eb = path->nodes[level]; | |
7391 | u64 parent = 0; | |
7392 | ||
7393 | if (wc->stage == UPDATE_BACKREF) { | |
7394 | BUG_ON(wc->shared_level < level); | |
7395 | if (level < wc->shared_level) | |
7396 | goto out; | |
7397 | ||
2c47e605 YZ |
7398 | ret = find_next_key(path, level + 1, &wc->update_progress); |
7399 | if (ret > 0) | |
7400 | wc->update_ref = 0; | |
7401 | ||
7402 | wc->stage = DROP_REFERENCE; | |
7403 | wc->shared_level = -1; | |
7404 | path->slots[level] = 0; | |
7405 | ||
7406 | /* | |
7407 | * check reference count again if the block isn't locked. | |
7408 | * we should start walking down the tree again if reference | |
7409 | * count is one. | |
7410 | */ | |
7411 | if (!path->locks[level]) { | |
7412 | BUG_ON(level == 0); | |
7413 | btrfs_tree_lock(eb); | |
7414 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7415 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7416 | |
7417 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7418 | eb->start, level, 1, |
2c47e605 YZ |
7419 | &wc->refs[level], |
7420 | &wc->flags[level]); | |
79787eaa JM |
7421 | if (ret < 0) { |
7422 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7423 | path->locks[level] = 0; |
79787eaa JM |
7424 | return ret; |
7425 | } | |
2c47e605 YZ |
7426 | BUG_ON(wc->refs[level] == 0); |
7427 | if (wc->refs[level] == 1) { | |
bd681513 | 7428 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7429 | path->locks[level] = 0; |
2c47e605 YZ |
7430 | return 1; |
7431 | } | |
f82d02d9 | 7432 | } |
2c47e605 | 7433 | } |
f82d02d9 | 7434 | |
2c47e605 YZ |
7435 | /* wc->stage == DROP_REFERENCE */ |
7436 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7437 | |
2c47e605 YZ |
7438 | if (wc->refs[level] == 1) { |
7439 | if (level == 0) { | |
7440 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7441 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7442 | wc->for_reloc); | |
2c47e605 | 7443 | else |
66d7e7f0 AJ |
7444 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7445 | wc->for_reloc); | |
79787eaa | 7446 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7447 | } |
7448 | /* make block locked assertion in clean_tree_block happy */ | |
7449 | if (!path->locks[level] && | |
7450 | btrfs_header_generation(eb) == trans->transid) { | |
7451 | btrfs_tree_lock(eb); | |
7452 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7453 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7454 | } |
7455 | clean_tree_block(trans, root, eb); | |
7456 | } | |
7457 | ||
7458 | if (eb == root->node) { | |
7459 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7460 | parent = eb->start; | |
7461 | else | |
7462 | BUG_ON(root->root_key.objectid != | |
7463 | btrfs_header_owner(eb)); | |
7464 | } else { | |
7465 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7466 | parent = path->nodes[level + 1]->start; | |
7467 | else | |
7468 | BUG_ON(root->root_key.objectid != | |
7469 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7470 | } |
f82d02d9 | 7471 | |
5581a51a | 7472 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7473 | out: |
7474 | wc->refs[level] = 0; | |
7475 | wc->flags[level] = 0; | |
f0486c68 | 7476 | return 0; |
2c47e605 YZ |
7477 | } |
7478 | ||
7479 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7480 | struct btrfs_root *root, | |
7481 | struct btrfs_path *path, | |
7482 | struct walk_control *wc) | |
7483 | { | |
2c47e605 | 7484 | int level = wc->level; |
94fcca9f | 7485 | int lookup_info = 1; |
2c47e605 YZ |
7486 | int ret; |
7487 | ||
7488 | while (level >= 0) { | |
94fcca9f | 7489 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7490 | if (ret > 0) |
7491 | break; | |
7492 | ||
7493 | if (level == 0) | |
7494 | break; | |
7495 | ||
7a7965f8 YZ |
7496 | if (path->slots[level] >= |
7497 | btrfs_header_nritems(path->nodes[level])) | |
7498 | break; | |
7499 | ||
94fcca9f | 7500 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7501 | if (ret > 0) { |
7502 | path->slots[level]++; | |
7503 | continue; | |
90d2c51d MX |
7504 | } else if (ret < 0) |
7505 | return ret; | |
1c4850e2 | 7506 | level = wc->level; |
f82d02d9 | 7507 | } |
f82d02d9 YZ |
7508 | return 0; |
7509 | } | |
7510 | ||
d397712b | 7511 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7512 | struct btrfs_root *root, |
f82d02d9 | 7513 | struct btrfs_path *path, |
2c47e605 | 7514 | struct walk_control *wc, int max_level) |
20524f02 | 7515 | { |
2c47e605 | 7516 | int level = wc->level; |
20524f02 | 7517 | int ret; |
9f3a7427 | 7518 | |
2c47e605 YZ |
7519 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7520 | while (level < max_level && path->nodes[level]) { | |
7521 | wc->level = level; | |
7522 | if (path->slots[level] + 1 < | |
7523 | btrfs_header_nritems(path->nodes[level])) { | |
7524 | path->slots[level]++; | |
20524f02 CM |
7525 | return 0; |
7526 | } else { | |
2c47e605 YZ |
7527 | ret = walk_up_proc(trans, root, path, wc); |
7528 | if (ret > 0) | |
7529 | return 0; | |
bd56b302 | 7530 | |
2c47e605 | 7531 | if (path->locks[level]) { |
bd681513 CM |
7532 | btrfs_tree_unlock_rw(path->nodes[level], |
7533 | path->locks[level]); | |
2c47e605 | 7534 | path->locks[level] = 0; |
f82d02d9 | 7535 | } |
2c47e605 YZ |
7536 | free_extent_buffer(path->nodes[level]); |
7537 | path->nodes[level] = NULL; | |
7538 | level++; | |
20524f02 CM |
7539 | } |
7540 | } | |
7541 | return 1; | |
7542 | } | |
7543 | ||
9aca1d51 | 7544 | /* |
2c47e605 YZ |
7545 | * drop a subvolume tree. |
7546 | * | |
7547 | * this function traverses the tree freeing any blocks that only | |
7548 | * referenced by the tree. | |
7549 | * | |
7550 | * when a shared tree block is found. this function decreases its | |
7551 | * reference count by one. if update_ref is true, this function | |
7552 | * also make sure backrefs for the shared block and all lower level | |
7553 | * blocks are properly updated. | |
9d1a2a3a DS |
7554 | * |
7555 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 7556 | */ |
2c536799 | 7557 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7558 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7559 | int for_reloc) | |
20524f02 | 7560 | { |
5caf2a00 | 7561 | struct btrfs_path *path; |
2c47e605 YZ |
7562 | struct btrfs_trans_handle *trans; |
7563 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7564 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7565 | struct walk_control *wc; |
7566 | struct btrfs_key key; | |
7567 | int err = 0; | |
7568 | int ret; | |
7569 | int level; | |
d29a9f62 | 7570 | bool root_dropped = false; |
20524f02 | 7571 | |
5caf2a00 | 7572 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7573 | if (!path) { |
7574 | err = -ENOMEM; | |
7575 | goto out; | |
7576 | } | |
20524f02 | 7577 | |
2c47e605 | 7578 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7579 | if (!wc) { |
7580 | btrfs_free_path(path); | |
cb1b69f4 TI |
7581 | err = -ENOMEM; |
7582 | goto out; | |
38a1a919 | 7583 | } |
2c47e605 | 7584 | |
a22285a6 | 7585 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7586 | if (IS_ERR(trans)) { |
7587 | err = PTR_ERR(trans); | |
7588 | goto out_free; | |
7589 | } | |
98d5dc13 | 7590 | |
3fd0a558 YZ |
7591 | if (block_rsv) |
7592 | trans->block_rsv = block_rsv; | |
2c47e605 | 7593 | |
9f3a7427 | 7594 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7595 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7596 | path->nodes[level] = btrfs_lock_root_node(root); |
7597 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7598 | path->slots[level] = 0; |
bd681513 | 7599 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7600 | memset(&wc->update_progress, 0, |
7601 | sizeof(wc->update_progress)); | |
9f3a7427 | 7602 | } else { |
9f3a7427 | 7603 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7604 | memcpy(&wc->update_progress, &key, |
7605 | sizeof(wc->update_progress)); | |
7606 | ||
6702ed49 | 7607 | level = root_item->drop_level; |
2c47e605 | 7608 | BUG_ON(level == 0); |
6702ed49 | 7609 | path->lowest_level = level; |
2c47e605 YZ |
7610 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7611 | path->lowest_level = 0; | |
7612 | if (ret < 0) { | |
7613 | err = ret; | |
79787eaa | 7614 | goto out_end_trans; |
9f3a7427 | 7615 | } |
1c4850e2 | 7616 | WARN_ON(ret > 0); |
2c47e605 | 7617 | |
7d9eb12c CM |
7618 | /* |
7619 | * unlock our path, this is safe because only this | |
7620 | * function is allowed to delete this snapshot | |
7621 | */ | |
5d4f98a2 | 7622 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7623 | |
7624 | level = btrfs_header_level(root->node); | |
7625 | while (1) { | |
7626 | btrfs_tree_lock(path->nodes[level]); | |
7627 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 7628 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7629 | |
7630 | ret = btrfs_lookup_extent_info(trans, root, | |
7631 | path->nodes[level]->start, | |
3173a18f | 7632 | level, 1, &wc->refs[level], |
2c47e605 | 7633 | &wc->flags[level]); |
79787eaa JM |
7634 | if (ret < 0) { |
7635 | err = ret; | |
7636 | goto out_end_trans; | |
7637 | } | |
2c47e605 YZ |
7638 | BUG_ON(wc->refs[level] == 0); |
7639 | ||
7640 | if (level == root_item->drop_level) | |
7641 | break; | |
7642 | ||
7643 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 7644 | path->locks[level] = 0; |
2c47e605 YZ |
7645 | WARN_ON(wc->refs[level] != 1); |
7646 | level--; | |
7647 | } | |
9f3a7427 | 7648 | } |
2c47e605 YZ |
7649 | |
7650 | wc->level = level; | |
7651 | wc->shared_level = -1; | |
7652 | wc->stage = DROP_REFERENCE; | |
7653 | wc->update_ref = update_ref; | |
7654 | wc->keep_locks = 0; | |
66d7e7f0 | 7655 | wc->for_reloc = for_reloc; |
1c4850e2 | 7656 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7657 | |
d397712b | 7658 | while (1) { |
9d1a2a3a | 7659 | |
2c47e605 YZ |
7660 | ret = walk_down_tree(trans, root, path, wc); |
7661 | if (ret < 0) { | |
7662 | err = ret; | |
20524f02 | 7663 | break; |
2c47e605 | 7664 | } |
9aca1d51 | 7665 | |
2c47e605 YZ |
7666 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7667 | if (ret < 0) { | |
7668 | err = ret; | |
20524f02 | 7669 | break; |
2c47e605 YZ |
7670 | } |
7671 | ||
7672 | if (ret > 0) { | |
7673 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7674 | break; |
7675 | } | |
2c47e605 YZ |
7676 | |
7677 | if (wc->stage == DROP_REFERENCE) { | |
7678 | level = wc->level; | |
7679 | btrfs_node_key(path->nodes[level], | |
7680 | &root_item->drop_progress, | |
7681 | path->slots[level]); | |
7682 | root_item->drop_level = level; | |
7683 | } | |
7684 | ||
7685 | BUG_ON(wc->level == 0); | |
3c8f2422 JB |
7686 | if (btrfs_should_end_transaction(trans, tree_root) || |
7687 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
2c47e605 YZ |
7688 | ret = btrfs_update_root(trans, tree_root, |
7689 | &root->root_key, | |
7690 | root_item); | |
79787eaa JM |
7691 | if (ret) { |
7692 | btrfs_abort_transaction(trans, tree_root, ret); | |
7693 | err = ret; | |
7694 | goto out_end_trans; | |
7695 | } | |
2c47e605 | 7696 | |
3fd0a558 | 7697 | btrfs_end_transaction_throttle(trans, tree_root); |
3c8f2422 | 7698 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
efe120a0 | 7699 | pr_debug("BTRFS: drop snapshot early exit\n"); |
3c8f2422 JB |
7700 | err = -EAGAIN; |
7701 | goto out_free; | |
7702 | } | |
7703 | ||
a22285a6 | 7704 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7705 | if (IS_ERR(trans)) { |
7706 | err = PTR_ERR(trans); | |
7707 | goto out_free; | |
7708 | } | |
3fd0a558 YZ |
7709 | if (block_rsv) |
7710 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7711 | } |
20524f02 | 7712 | } |
b3b4aa74 | 7713 | btrfs_release_path(path); |
79787eaa JM |
7714 | if (err) |
7715 | goto out_end_trans; | |
2c47e605 YZ |
7716 | |
7717 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7718 | if (ret) { |
7719 | btrfs_abort_transaction(trans, tree_root, ret); | |
7720 | goto out_end_trans; | |
7721 | } | |
2c47e605 | 7722 | |
76dda93c | 7723 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
7724 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
7725 | NULL, NULL); | |
79787eaa JM |
7726 | if (ret < 0) { |
7727 | btrfs_abort_transaction(trans, tree_root, ret); | |
7728 | err = ret; | |
7729 | goto out_end_trans; | |
7730 | } else if (ret > 0) { | |
84cd948c JB |
7731 | /* if we fail to delete the orphan item this time |
7732 | * around, it'll get picked up the next time. | |
7733 | * | |
7734 | * The most common failure here is just -ENOENT. | |
7735 | */ | |
7736 | btrfs_del_orphan_item(trans, tree_root, | |
7737 | root->root_key.objectid); | |
76dda93c YZ |
7738 | } |
7739 | } | |
7740 | ||
7741 | if (root->in_radix) { | |
cb517eab | 7742 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
76dda93c YZ |
7743 | } else { |
7744 | free_extent_buffer(root->node); | |
7745 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 7746 | btrfs_put_fs_root(root); |
76dda93c | 7747 | } |
d29a9f62 | 7748 | root_dropped = true; |
79787eaa | 7749 | out_end_trans: |
3fd0a558 | 7750 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7751 | out_free: |
2c47e605 | 7752 | kfree(wc); |
5caf2a00 | 7753 | btrfs_free_path(path); |
cb1b69f4 | 7754 | out: |
d29a9f62 JB |
7755 | /* |
7756 | * So if we need to stop dropping the snapshot for whatever reason we | |
7757 | * need to make sure to add it back to the dead root list so that we | |
7758 | * keep trying to do the work later. This also cleans up roots if we | |
7759 | * don't have it in the radix (like when we recover after a power fail | |
7760 | * or unmount) so we don't leak memory. | |
7761 | */ | |
b37b39cd | 7762 | if (!for_reloc && root_dropped == false) |
d29a9f62 | 7763 | btrfs_add_dead_root(root); |
90515e7f | 7764 | if (err && err != -EAGAIN) |
cb1b69f4 | 7765 | btrfs_std_error(root->fs_info, err); |
2c536799 | 7766 | return err; |
20524f02 | 7767 | } |
9078a3e1 | 7768 | |
2c47e605 YZ |
7769 | /* |
7770 | * drop subtree rooted at tree block 'node'. | |
7771 | * | |
7772 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7773 | * only used by relocation code |
2c47e605 | 7774 | */ |
f82d02d9 YZ |
7775 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7776 | struct btrfs_root *root, | |
7777 | struct extent_buffer *node, | |
7778 | struct extent_buffer *parent) | |
7779 | { | |
7780 | struct btrfs_path *path; | |
2c47e605 | 7781 | struct walk_control *wc; |
f82d02d9 YZ |
7782 | int level; |
7783 | int parent_level; | |
7784 | int ret = 0; | |
7785 | int wret; | |
7786 | ||
2c47e605 YZ |
7787 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7788 | ||
f82d02d9 | 7789 | path = btrfs_alloc_path(); |
db5b493a TI |
7790 | if (!path) |
7791 | return -ENOMEM; | |
f82d02d9 | 7792 | |
2c47e605 | 7793 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7794 | if (!wc) { |
7795 | btrfs_free_path(path); | |
7796 | return -ENOMEM; | |
7797 | } | |
2c47e605 | 7798 | |
b9447ef8 | 7799 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7800 | parent_level = btrfs_header_level(parent); |
7801 | extent_buffer_get(parent); | |
7802 | path->nodes[parent_level] = parent; | |
7803 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7804 | ||
b9447ef8 | 7805 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7806 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7807 | path->nodes[level] = node; |
7808 | path->slots[level] = 0; | |
bd681513 | 7809 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7810 | |
7811 | wc->refs[parent_level] = 1; | |
7812 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7813 | wc->level = level; | |
7814 | wc->shared_level = -1; | |
7815 | wc->stage = DROP_REFERENCE; | |
7816 | wc->update_ref = 0; | |
7817 | wc->keep_locks = 1; | |
66d7e7f0 | 7818 | wc->for_reloc = 1; |
1c4850e2 | 7819 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7820 | |
7821 | while (1) { | |
2c47e605 YZ |
7822 | wret = walk_down_tree(trans, root, path, wc); |
7823 | if (wret < 0) { | |
f82d02d9 | 7824 | ret = wret; |
f82d02d9 | 7825 | break; |
2c47e605 | 7826 | } |
f82d02d9 | 7827 | |
2c47e605 | 7828 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7829 | if (wret < 0) |
7830 | ret = wret; | |
7831 | if (wret != 0) | |
7832 | break; | |
7833 | } | |
7834 | ||
2c47e605 | 7835 | kfree(wc); |
f82d02d9 YZ |
7836 | btrfs_free_path(path); |
7837 | return ret; | |
7838 | } | |
7839 | ||
ec44a35c CM |
7840 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7841 | { | |
7842 | u64 num_devices; | |
fc67c450 | 7843 | u64 stripped; |
e4d8ec0f | 7844 | |
fc67c450 ID |
7845 | /* |
7846 | * if restripe for this chunk_type is on pick target profile and | |
7847 | * return, otherwise do the usual balance | |
7848 | */ | |
7849 | stripped = get_restripe_target(root->fs_info, flags); | |
7850 | if (stripped) | |
7851 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7852 | |
cd02dca5 CM |
7853 | /* |
7854 | * we add in the count of missing devices because we want | |
7855 | * to make sure that any RAID levels on a degraded FS | |
7856 | * continue to be honored. | |
7857 | */ | |
7858 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7859 | root->fs_info->fs_devices->missing_devices; | |
7860 | ||
fc67c450 | 7861 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7862 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7863 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7864 | ||
ec44a35c CM |
7865 | if (num_devices == 1) { |
7866 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7867 | stripped = flags & ~stripped; | |
7868 | ||
7869 | /* turn raid0 into single device chunks */ | |
7870 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7871 | return stripped; | |
7872 | ||
7873 | /* turn mirroring into duplication */ | |
7874 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7875 | BTRFS_BLOCK_GROUP_RAID10)) | |
7876 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7877 | } else { |
7878 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7879 | if (flags & stripped) |
7880 | return flags; | |
7881 | ||
7882 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7883 | stripped = flags & ~stripped; | |
7884 | ||
7885 | /* switch duplicated blocks with raid1 */ | |
7886 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7887 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7888 | ||
e3176ca2 | 7889 | /* this is drive concat, leave it alone */ |
ec44a35c | 7890 | } |
e3176ca2 | 7891 | |
ec44a35c CM |
7892 | return flags; |
7893 | } | |
7894 | ||
199c36ea | 7895 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7896 | { |
f0486c68 YZ |
7897 | struct btrfs_space_info *sinfo = cache->space_info; |
7898 | u64 num_bytes; | |
199c36ea | 7899 | u64 min_allocable_bytes; |
f0486c68 | 7900 | int ret = -ENOSPC; |
0ef3e66b | 7901 | |
c286ac48 | 7902 | |
199c36ea MX |
7903 | /* |
7904 | * We need some metadata space and system metadata space for | |
7905 | * allocating chunks in some corner cases until we force to set | |
7906 | * it to be readonly. | |
7907 | */ | |
7908 | if ((sinfo->flags & | |
7909 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7910 | !force) | |
7911 | min_allocable_bytes = 1 * 1024 * 1024; | |
7912 | else | |
7913 | min_allocable_bytes = 0; | |
7914 | ||
f0486c68 YZ |
7915 | spin_lock(&sinfo->lock); |
7916 | spin_lock(&cache->lock); | |
61cfea9b W |
7917 | |
7918 | if (cache->ro) { | |
7919 | ret = 0; | |
7920 | goto out; | |
7921 | } | |
7922 | ||
f0486c68 YZ |
7923 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7924 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7925 | ||
7926 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7927 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7928 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7929 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7930 | cache->ro = 1; |
7931 | ret = 0; | |
7932 | } | |
61cfea9b | 7933 | out: |
f0486c68 YZ |
7934 | spin_unlock(&cache->lock); |
7935 | spin_unlock(&sinfo->lock); | |
7936 | return ret; | |
7937 | } | |
7d9eb12c | 7938 | |
f0486c68 YZ |
7939 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7940 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7941 | |
f0486c68 YZ |
7942 | { |
7943 | struct btrfs_trans_handle *trans; | |
7944 | u64 alloc_flags; | |
7945 | int ret; | |
7d9eb12c | 7946 | |
f0486c68 | 7947 | BUG_ON(cache->ro); |
0ef3e66b | 7948 | |
ff5714cc | 7949 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7950 | if (IS_ERR(trans)) |
7951 | return PTR_ERR(trans); | |
5d4f98a2 | 7952 | |
f0486c68 | 7953 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7954 | if (alloc_flags != cache->flags) { |
698d0082 | 7955 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7956 | CHUNK_ALLOC_FORCE); |
7957 | if (ret < 0) | |
7958 | goto out; | |
7959 | } | |
5d4f98a2 | 7960 | |
199c36ea | 7961 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7962 | if (!ret) |
7963 | goto out; | |
7964 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7965 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7966 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7967 | if (ret < 0) |
7968 | goto out; | |
199c36ea | 7969 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7970 | out: |
7971 | btrfs_end_transaction(trans, root); | |
7972 | return ret; | |
7973 | } | |
5d4f98a2 | 7974 | |
c87f08ca CM |
7975 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7976 | struct btrfs_root *root, u64 type) | |
7977 | { | |
7978 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7979 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7980 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7981 | } |
7982 | ||
6d07bcec MX |
7983 | /* |
7984 | * helper to account the unused space of all the readonly block group in the | |
7985 | * list. takes mirrors into account. | |
7986 | */ | |
7987 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7988 | { | |
7989 | struct btrfs_block_group_cache *block_group; | |
7990 | u64 free_bytes = 0; | |
7991 | int factor; | |
7992 | ||
7993 | list_for_each_entry(block_group, groups_list, list) { | |
7994 | spin_lock(&block_group->lock); | |
7995 | ||
7996 | if (!block_group->ro) { | |
7997 | spin_unlock(&block_group->lock); | |
7998 | continue; | |
7999 | } | |
8000 | ||
8001 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
8002 | BTRFS_BLOCK_GROUP_RAID10 | | |
8003 | BTRFS_BLOCK_GROUP_DUP)) | |
8004 | factor = 2; | |
8005 | else | |
8006 | factor = 1; | |
8007 | ||
8008 | free_bytes += (block_group->key.offset - | |
8009 | btrfs_block_group_used(&block_group->item)) * | |
8010 | factor; | |
8011 | ||
8012 | spin_unlock(&block_group->lock); | |
8013 | } | |
8014 | ||
8015 | return free_bytes; | |
8016 | } | |
8017 | ||
8018 | /* | |
8019 | * helper to account the unused space of all the readonly block group in the | |
8020 | * space_info. takes mirrors into account. | |
8021 | */ | |
8022 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
8023 | { | |
8024 | int i; | |
8025 | u64 free_bytes = 0; | |
8026 | ||
8027 | spin_lock(&sinfo->lock); | |
8028 | ||
67871254 | 8029 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
6d07bcec MX |
8030 | if (!list_empty(&sinfo->block_groups[i])) |
8031 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
8032 | &sinfo->block_groups[i]); | |
8033 | ||
8034 | spin_unlock(&sinfo->lock); | |
8035 | ||
8036 | return free_bytes; | |
8037 | } | |
8038 | ||
143bede5 | 8039 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 8040 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 8041 | { |
f0486c68 YZ |
8042 | struct btrfs_space_info *sinfo = cache->space_info; |
8043 | u64 num_bytes; | |
8044 | ||
8045 | BUG_ON(!cache->ro); | |
8046 | ||
8047 | spin_lock(&sinfo->lock); | |
8048 | spin_lock(&cache->lock); | |
8049 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8050 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8051 | sinfo->bytes_readonly -= num_bytes; | |
8052 | cache->ro = 0; | |
8053 | spin_unlock(&cache->lock); | |
8054 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
8055 | } |
8056 | ||
ba1bf481 JB |
8057 | /* |
8058 | * checks to see if its even possible to relocate this block group. | |
8059 | * | |
8060 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
8061 | * ok to go ahead and try. | |
8062 | */ | |
8063 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 8064 | { |
ba1bf481 JB |
8065 | struct btrfs_block_group_cache *block_group; |
8066 | struct btrfs_space_info *space_info; | |
8067 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8068 | struct btrfs_device *device; | |
6df9a95e | 8069 | struct btrfs_trans_handle *trans; |
cdcb725c | 8070 | u64 min_free; |
6719db6a JB |
8071 | u64 dev_min = 1; |
8072 | u64 dev_nr = 0; | |
4a5e98f5 | 8073 | u64 target; |
cdcb725c | 8074 | int index; |
ba1bf481 JB |
8075 | int full = 0; |
8076 | int ret = 0; | |
1a40e23b | 8077 | |
ba1bf481 | 8078 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 8079 | |
ba1bf481 JB |
8080 | /* odd, couldn't find the block group, leave it alone */ |
8081 | if (!block_group) | |
8082 | return -1; | |
1a40e23b | 8083 | |
cdcb725c | 8084 | min_free = btrfs_block_group_used(&block_group->item); |
8085 | ||
ba1bf481 | 8086 | /* no bytes used, we're good */ |
cdcb725c | 8087 | if (!min_free) |
1a40e23b ZY |
8088 | goto out; |
8089 | ||
ba1bf481 JB |
8090 | space_info = block_group->space_info; |
8091 | spin_lock(&space_info->lock); | |
17d217fe | 8092 | |
ba1bf481 | 8093 | full = space_info->full; |
17d217fe | 8094 | |
ba1bf481 JB |
8095 | /* |
8096 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
8097 | * relocate it unless we're able to allocate a new chunk below. |
8098 | * | |
8099 | * Otherwise, we need to make sure we have room in the space to handle | |
8100 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8101 | */ |
7ce618db | 8102 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 8103 | (space_info->bytes_used + space_info->bytes_reserved + |
8104 | space_info->bytes_pinned + space_info->bytes_readonly + | |
8105 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
8106 | spin_unlock(&space_info->lock); |
8107 | goto out; | |
17d217fe | 8108 | } |
ba1bf481 | 8109 | spin_unlock(&space_info->lock); |
ea8c2819 | 8110 | |
ba1bf481 JB |
8111 | /* |
8112 | * ok we don't have enough space, but maybe we have free space on our | |
8113 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
8114 | * alloc devices and guess if we have enough space. if this block |
8115 | * group is going to be restriped, run checks against the target | |
8116 | * profile instead of the current one. | |
ba1bf481 JB |
8117 | */ |
8118 | ret = -1; | |
ea8c2819 | 8119 | |
cdcb725c | 8120 | /* |
8121 | * index: | |
8122 | * 0: raid10 | |
8123 | * 1: raid1 | |
8124 | * 2: dup | |
8125 | * 3: raid0 | |
8126 | * 4: single | |
8127 | */ | |
4a5e98f5 ID |
8128 | target = get_restripe_target(root->fs_info, block_group->flags); |
8129 | if (target) { | |
31e50229 | 8130 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
8131 | } else { |
8132 | /* | |
8133 | * this is just a balance, so if we were marked as full | |
8134 | * we know there is no space for a new chunk | |
8135 | */ | |
8136 | if (full) | |
8137 | goto out; | |
8138 | ||
8139 | index = get_block_group_index(block_group); | |
8140 | } | |
8141 | ||
e6ec716f | 8142 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 8143 | dev_min = 4; |
6719db6a JB |
8144 | /* Divide by 2 */ |
8145 | min_free >>= 1; | |
e6ec716f | 8146 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 8147 | dev_min = 2; |
e6ec716f | 8148 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
8149 | /* Multiply by 2 */ |
8150 | min_free <<= 1; | |
e6ec716f | 8151 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 8152 | dev_min = fs_devices->rw_devices; |
6719db6a | 8153 | do_div(min_free, dev_min); |
cdcb725c | 8154 | } |
8155 | ||
6df9a95e JB |
8156 | /* We need to do this so that we can look at pending chunks */ |
8157 | trans = btrfs_join_transaction(root); | |
8158 | if (IS_ERR(trans)) { | |
8159 | ret = PTR_ERR(trans); | |
8160 | goto out; | |
8161 | } | |
8162 | ||
ba1bf481 JB |
8163 | mutex_lock(&root->fs_info->chunk_mutex); |
8164 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 8165 | u64 dev_offset; |
56bec294 | 8166 | |
ba1bf481 JB |
8167 | /* |
8168 | * check to make sure we can actually find a chunk with enough | |
8169 | * space to fit our block group in. | |
8170 | */ | |
63a212ab SB |
8171 | if (device->total_bytes > device->bytes_used + min_free && |
8172 | !device->is_tgtdev_for_dev_replace) { | |
6df9a95e | 8173 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 8174 | &dev_offset, NULL); |
ba1bf481 | 8175 | if (!ret) |
cdcb725c | 8176 | dev_nr++; |
8177 | ||
8178 | if (dev_nr >= dev_min) | |
73e48b27 | 8179 | break; |
cdcb725c | 8180 | |
ba1bf481 | 8181 | ret = -1; |
725c8463 | 8182 | } |
edbd8d4e | 8183 | } |
ba1bf481 | 8184 | mutex_unlock(&root->fs_info->chunk_mutex); |
6df9a95e | 8185 | btrfs_end_transaction(trans, root); |
edbd8d4e | 8186 | out: |
ba1bf481 | 8187 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8188 | return ret; |
8189 | } | |
8190 | ||
b2950863 CH |
8191 | static int find_first_block_group(struct btrfs_root *root, |
8192 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8193 | { |
925baedd | 8194 | int ret = 0; |
0b86a832 CM |
8195 | struct btrfs_key found_key; |
8196 | struct extent_buffer *leaf; | |
8197 | int slot; | |
edbd8d4e | 8198 | |
0b86a832 CM |
8199 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8200 | if (ret < 0) | |
925baedd CM |
8201 | goto out; |
8202 | ||
d397712b | 8203 | while (1) { |
0b86a832 | 8204 | slot = path->slots[0]; |
edbd8d4e | 8205 | leaf = path->nodes[0]; |
0b86a832 CM |
8206 | if (slot >= btrfs_header_nritems(leaf)) { |
8207 | ret = btrfs_next_leaf(root, path); | |
8208 | if (ret == 0) | |
8209 | continue; | |
8210 | if (ret < 0) | |
925baedd | 8211 | goto out; |
0b86a832 | 8212 | break; |
edbd8d4e | 8213 | } |
0b86a832 | 8214 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8215 | |
0b86a832 | 8216 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8217 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8218 | ret = 0; | |
8219 | goto out; | |
8220 | } | |
0b86a832 | 8221 | path->slots[0]++; |
edbd8d4e | 8222 | } |
925baedd | 8223 | out: |
0b86a832 | 8224 | return ret; |
edbd8d4e CM |
8225 | } |
8226 | ||
0af3d00b JB |
8227 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8228 | { | |
8229 | struct btrfs_block_group_cache *block_group; | |
8230 | u64 last = 0; | |
8231 | ||
8232 | while (1) { | |
8233 | struct inode *inode; | |
8234 | ||
8235 | block_group = btrfs_lookup_first_block_group(info, last); | |
8236 | while (block_group) { | |
8237 | spin_lock(&block_group->lock); | |
8238 | if (block_group->iref) | |
8239 | break; | |
8240 | spin_unlock(&block_group->lock); | |
8241 | block_group = next_block_group(info->tree_root, | |
8242 | block_group); | |
8243 | } | |
8244 | if (!block_group) { | |
8245 | if (last == 0) | |
8246 | break; | |
8247 | last = 0; | |
8248 | continue; | |
8249 | } | |
8250 | ||
8251 | inode = block_group->inode; | |
8252 | block_group->iref = 0; | |
8253 | block_group->inode = NULL; | |
8254 | spin_unlock(&block_group->lock); | |
8255 | iput(inode); | |
8256 | last = block_group->key.objectid + block_group->key.offset; | |
8257 | btrfs_put_block_group(block_group); | |
8258 | } | |
8259 | } | |
8260 | ||
1a40e23b ZY |
8261 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8262 | { | |
8263 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8264 | struct btrfs_space_info *space_info; |
11833d66 | 8265 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8266 | struct rb_node *n; |
8267 | ||
11833d66 YZ |
8268 | down_write(&info->extent_commit_sem); |
8269 | while (!list_empty(&info->caching_block_groups)) { | |
8270 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8271 | struct btrfs_caching_control, list); | |
8272 | list_del(&caching_ctl->list); | |
8273 | put_caching_control(caching_ctl); | |
8274 | } | |
8275 | up_write(&info->extent_commit_sem); | |
8276 | ||
1a40e23b ZY |
8277 | spin_lock(&info->block_group_cache_lock); |
8278 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8279 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8280 | cache_node); | |
1a40e23b ZY |
8281 | rb_erase(&block_group->cache_node, |
8282 | &info->block_group_cache_tree); | |
d899e052 YZ |
8283 | spin_unlock(&info->block_group_cache_lock); |
8284 | ||
80eb234a | 8285 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8286 | list_del(&block_group->list); |
80eb234a | 8287 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8288 | |
817d52f8 | 8289 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8290 | wait_block_group_cache_done(block_group); |
817d52f8 | 8291 | |
3c14874a JB |
8292 | /* |
8293 | * We haven't cached this block group, which means we could | |
8294 | * possibly have excluded extents on this block group. | |
8295 | */ | |
36cce922 JB |
8296 | if (block_group->cached == BTRFS_CACHE_NO || |
8297 | block_group->cached == BTRFS_CACHE_ERROR) | |
3c14874a JB |
8298 | free_excluded_extents(info->extent_root, block_group); |
8299 | ||
817d52f8 | 8300 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 8301 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8302 | |
8303 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8304 | } |
8305 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8306 | |
8307 | /* now that all the block groups are freed, go through and | |
8308 | * free all the space_info structs. This is only called during | |
8309 | * the final stages of unmount, and so we know nobody is | |
8310 | * using them. We call synchronize_rcu() once before we start, | |
8311 | * just to be on the safe side. | |
8312 | */ | |
8313 | synchronize_rcu(); | |
8314 | ||
8929ecfa YZ |
8315 | release_global_block_rsv(info); |
8316 | ||
67871254 | 8317 | while (!list_empty(&info->space_info)) { |
6ab0a202 JM |
8318 | int i; |
8319 | ||
4184ea7f CM |
8320 | space_info = list_entry(info->space_info.next, |
8321 | struct btrfs_space_info, | |
8322 | list); | |
b069e0c3 | 8323 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
fae7f21c | 8324 | if (WARN_ON(space_info->bytes_pinned > 0 || |
b069e0c3 | 8325 | space_info->bytes_reserved > 0 || |
fae7f21c | 8326 | space_info->bytes_may_use > 0)) { |
b069e0c3 DS |
8327 | dump_space_info(space_info, 0, 0); |
8328 | } | |
f0486c68 | 8329 | } |
4184ea7f | 8330 | list_del(&space_info->list); |
6ab0a202 JM |
8331 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
8332 | struct kobject *kobj; | |
8333 | kobj = &space_info->block_group_kobjs[i]; | |
8334 | if (kobj->parent) { | |
8335 | kobject_del(kobj); | |
8336 | kobject_put(kobj); | |
8337 | } | |
8338 | } | |
8339 | kobject_del(&space_info->kobj); | |
8340 | kobject_put(&space_info->kobj); | |
4184ea7f | 8341 | } |
1a40e23b ZY |
8342 | return 0; |
8343 | } | |
8344 | ||
b742bb82 YZ |
8345 | static void __link_block_group(struct btrfs_space_info *space_info, |
8346 | struct btrfs_block_group_cache *cache) | |
8347 | { | |
8348 | int index = get_block_group_index(cache); | |
8349 | ||
8350 | down_write(&space_info->groups_sem); | |
6ab0a202 JM |
8351 | if (list_empty(&space_info->block_groups[index])) { |
8352 | struct kobject *kobj = &space_info->block_group_kobjs[index]; | |
8353 | int ret; | |
8354 | ||
8355 | kobject_get(&space_info->kobj); /* put in release */ | |
536cd964 MX |
8356 | ret = kobject_add(kobj, &space_info->kobj, "%s", |
8357 | get_raid_name(index)); | |
6ab0a202 | 8358 | if (ret) { |
efe120a0 | 8359 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); |
6ab0a202 JM |
8360 | kobject_put(&space_info->kobj); |
8361 | } | |
8362 | } | |
b742bb82 YZ |
8363 | list_add_tail(&cache->list, &space_info->block_groups[index]); |
8364 | up_write(&space_info->groups_sem); | |
8365 | } | |
8366 | ||
9078a3e1 CM |
8367 | int btrfs_read_block_groups(struct btrfs_root *root) |
8368 | { | |
8369 | struct btrfs_path *path; | |
8370 | int ret; | |
9078a3e1 | 8371 | struct btrfs_block_group_cache *cache; |
be744175 | 8372 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8373 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8374 | struct btrfs_key key; |
8375 | struct btrfs_key found_key; | |
5f39d397 | 8376 | struct extent_buffer *leaf; |
0af3d00b JB |
8377 | int need_clear = 0; |
8378 | u64 cache_gen; | |
96b5179d | 8379 | |
be744175 | 8380 | root = info->extent_root; |
9078a3e1 | 8381 | key.objectid = 0; |
0b86a832 | 8382 | key.offset = 0; |
9078a3e1 | 8383 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8384 | path = btrfs_alloc_path(); |
8385 | if (!path) | |
8386 | return -ENOMEM; | |
026fd317 | 8387 | path->reada = 1; |
9078a3e1 | 8388 | |
6c41761f | 8389 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 8390 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 8391 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 8392 | need_clear = 1; |
88c2ba3b JB |
8393 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8394 | need_clear = 1; | |
0af3d00b | 8395 | |
d397712b | 8396 | while (1) { |
0b86a832 | 8397 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8398 | if (ret > 0) |
8399 | break; | |
0b86a832 CM |
8400 | if (ret != 0) |
8401 | goto error; | |
5f39d397 CM |
8402 | leaf = path->nodes[0]; |
8403 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8404 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8405 | if (!cache) { |
0b86a832 | 8406 | ret = -ENOMEM; |
f0486c68 | 8407 | goto error; |
9078a3e1 | 8408 | } |
34d52cb6 LZ |
8409 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8410 | GFP_NOFS); | |
8411 | if (!cache->free_space_ctl) { | |
8412 | kfree(cache); | |
8413 | ret = -ENOMEM; | |
8414 | goto error; | |
8415 | } | |
3e1ad54f | 8416 | |
d2fb3437 | 8417 | atomic_set(&cache->count, 1); |
c286ac48 | 8418 | spin_lock_init(&cache->lock); |
817d52f8 | 8419 | cache->fs_info = info; |
0f9dd46c | 8420 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8421 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8422 | |
cf7c1ef6 LB |
8423 | if (need_clear) { |
8424 | /* | |
8425 | * When we mount with old space cache, we need to | |
8426 | * set BTRFS_DC_CLEAR and set dirty flag. | |
8427 | * | |
8428 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
8429 | * truncate the old free space cache inode and | |
8430 | * setup a new one. | |
8431 | * b) Setting 'dirty flag' makes sure that we flush | |
8432 | * the new space cache info onto disk. | |
8433 | */ | |
0af3d00b | 8434 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
8435 | if (btrfs_test_opt(root, SPACE_CACHE)) |
8436 | cache->dirty = 1; | |
8437 | } | |
0af3d00b | 8438 | |
5f39d397 CM |
8439 | read_extent_buffer(leaf, &cache->item, |
8440 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8441 | sizeof(cache->item)); | |
9078a3e1 | 8442 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8443 | |
9078a3e1 | 8444 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 8445 | btrfs_release_path(path); |
0b86a832 | 8446 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 | 8447 | cache->sectorsize = root->sectorsize; |
53b381b3 DW |
8448 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8449 | &root->fs_info->mapping_tree, | |
8450 | found_key.objectid); | |
34d52cb6 LZ |
8451 | btrfs_init_free_space_ctl(cache); |
8452 | ||
3c14874a JB |
8453 | /* |
8454 | * We need to exclude the super stripes now so that the space | |
8455 | * info has super bytes accounted for, otherwise we'll think | |
8456 | * we have more space than we actually do. | |
8457 | */ | |
835d974f JB |
8458 | ret = exclude_super_stripes(root, cache); |
8459 | if (ret) { | |
8460 | /* | |
8461 | * We may have excluded something, so call this just in | |
8462 | * case. | |
8463 | */ | |
8464 | free_excluded_extents(root, cache); | |
8465 | kfree(cache->free_space_ctl); | |
8466 | kfree(cache); | |
8467 | goto error; | |
8468 | } | |
3c14874a | 8469 | |
817d52f8 JB |
8470 | /* |
8471 | * check for two cases, either we are full, and therefore | |
8472 | * don't need to bother with the caching work since we won't | |
8473 | * find any space, or we are empty, and we can just add all | |
8474 | * the space in and be done with it. This saves us _alot_ of | |
8475 | * time, particularly in the full case. | |
8476 | */ | |
8477 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8478 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8479 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8480 | free_excluded_extents(root, cache); |
817d52f8 | 8481 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8482 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8483 | cache->cached = BTRFS_CACHE_FINISHED; |
8484 | add_new_free_space(cache, root->fs_info, | |
8485 | found_key.objectid, | |
8486 | found_key.objectid + | |
8487 | found_key.offset); | |
11833d66 | 8488 | free_excluded_extents(root, cache); |
817d52f8 | 8489 | } |
96b5179d | 8490 | |
8c579fe7 JB |
8491 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8492 | if (ret) { | |
8493 | btrfs_remove_free_space_cache(cache); | |
8494 | btrfs_put_block_group(cache); | |
8495 | goto error; | |
8496 | } | |
8497 | ||
6324fbf3 CM |
8498 | ret = update_space_info(info, cache->flags, found_key.offset, |
8499 | btrfs_block_group_used(&cache->item), | |
8500 | &space_info); | |
8c579fe7 JB |
8501 | if (ret) { |
8502 | btrfs_remove_free_space_cache(cache); | |
8503 | spin_lock(&info->block_group_cache_lock); | |
8504 | rb_erase(&cache->cache_node, | |
8505 | &info->block_group_cache_tree); | |
8506 | spin_unlock(&info->block_group_cache_lock); | |
8507 | btrfs_put_block_group(cache); | |
8508 | goto error; | |
8509 | } | |
8510 | ||
6324fbf3 | 8511 | cache->space_info = space_info; |
1b2da372 | 8512 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8513 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8514 | spin_unlock(&cache->space_info->lock); |
8515 | ||
b742bb82 | 8516 | __link_block_group(space_info, cache); |
0f9dd46c | 8517 | |
75ccf47d | 8518 | set_avail_alloc_bits(root->fs_info, cache->flags); |
2b82032c | 8519 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8520 | set_block_group_ro(cache, 1); |
9078a3e1 | 8521 | } |
b742bb82 YZ |
8522 | |
8523 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8524 | if (!(get_alloc_profile(root, space_info->flags) & | |
8525 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8526 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8527 | BTRFS_BLOCK_GROUP_RAID5 | |
8528 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8529 | BTRFS_BLOCK_GROUP_DUP))) |
8530 | continue; | |
8531 | /* | |
8532 | * avoid allocating from un-mirrored block group if there are | |
8533 | * mirrored block groups. | |
8534 | */ | |
1095cc0d | 8535 | list_for_each_entry(cache, |
8536 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
8537 | list) | |
199c36ea | 8538 | set_block_group_ro(cache, 1); |
1095cc0d | 8539 | list_for_each_entry(cache, |
8540 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
8541 | list) | |
199c36ea | 8542 | set_block_group_ro(cache, 1); |
9078a3e1 | 8543 | } |
f0486c68 YZ |
8544 | |
8545 | init_global_block_rsv(info); | |
0b86a832 CM |
8546 | ret = 0; |
8547 | error: | |
9078a3e1 | 8548 | btrfs_free_path(path); |
0b86a832 | 8549 | return ret; |
9078a3e1 | 8550 | } |
6324fbf3 | 8551 | |
ea658bad JB |
8552 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8553 | struct btrfs_root *root) | |
8554 | { | |
8555 | struct btrfs_block_group_cache *block_group, *tmp; | |
8556 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8557 | struct btrfs_block_group_item item; | |
8558 | struct btrfs_key key; | |
8559 | int ret = 0; | |
8560 | ||
8561 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8562 | new_bg_list) { | |
8563 | list_del_init(&block_group->new_bg_list); | |
8564 | ||
8565 | if (ret) | |
8566 | continue; | |
8567 | ||
8568 | spin_lock(&block_group->lock); | |
8569 | memcpy(&item, &block_group->item, sizeof(item)); | |
8570 | memcpy(&key, &block_group->key, sizeof(key)); | |
8571 | spin_unlock(&block_group->lock); | |
8572 | ||
8573 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8574 | sizeof(item)); | |
8575 | if (ret) | |
8576 | btrfs_abort_transaction(trans, extent_root, ret); | |
6df9a95e JB |
8577 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
8578 | key.objectid, key.offset); | |
8579 | if (ret) | |
8580 | btrfs_abort_transaction(trans, extent_root, ret); | |
ea658bad JB |
8581 | } |
8582 | } | |
8583 | ||
6324fbf3 CM |
8584 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8585 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8586 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8587 | u64 size) |
8588 | { | |
8589 | int ret; | |
6324fbf3 CM |
8590 | struct btrfs_root *extent_root; |
8591 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8592 | |
8593 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8594 | |
12fcfd22 | 8595 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8596 | |
8f18cf13 | 8597 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8598 | if (!cache) |
8599 | return -ENOMEM; | |
34d52cb6 LZ |
8600 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8601 | GFP_NOFS); | |
8602 | if (!cache->free_space_ctl) { | |
8603 | kfree(cache); | |
8604 | return -ENOMEM; | |
8605 | } | |
0f9dd46c | 8606 | |
e17cade2 | 8607 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8608 | cache->key.offset = size; |
d2fb3437 | 8609 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8610 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8611 | cache->fs_info = root->fs_info; |
53b381b3 DW |
8612 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8613 | &root->fs_info->mapping_tree, | |
8614 | chunk_offset); | |
96303081 | 8615 | |
d2fb3437 | 8616 | atomic_set(&cache->count, 1); |
c286ac48 | 8617 | spin_lock_init(&cache->lock); |
0f9dd46c | 8618 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8619 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 8620 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 8621 | |
34d52cb6 LZ |
8622 | btrfs_init_free_space_ctl(cache); |
8623 | ||
6324fbf3 | 8624 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8625 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8626 | cache->flags = type; | |
8627 | btrfs_set_block_group_flags(&cache->item, type); | |
8628 | ||
11833d66 | 8629 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8630 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8631 | ret = exclude_super_stripes(root, cache); |
8632 | if (ret) { | |
8633 | /* | |
8634 | * We may have excluded something, so call this just in | |
8635 | * case. | |
8636 | */ | |
8637 | free_excluded_extents(root, cache); | |
8638 | kfree(cache->free_space_ctl); | |
8639 | kfree(cache); | |
8640 | return ret; | |
8641 | } | |
96303081 | 8642 | |
817d52f8 JB |
8643 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8644 | chunk_offset + size); | |
8645 | ||
11833d66 YZ |
8646 | free_excluded_extents(root, cache); |
8647 | ||
8c579fe7 JB |
8648 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8649 | if (ret) { | |
8650 | btrfs_remove_free_space_cache(cache); | |
8651 | btrfs_put_block_group(cache); | |
8652 | return ret; | |
8653 | } | |
8654 | ||
6324fbf3 CM |
8655 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8656 | &cache->space_info); | |
8c579fe7 JB |
8657 | if (ret) { |
8658 | btrfs_remove_free_space_cache(cache); | |
8659 | spin_lock(&root->fs_info->block_group_cache_lock); | |
8660 | rb_erase(&cache->cache_node, | |
8661 | &root->fs_info->block_group_cache_tree); | |
8662 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
8663 | btrfs_put_block_group(cache); | |
8664 | return ret; | |
8665 | } | |
c7c144db | 8666 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8667 | |
8668 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8669 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8670 | spin_unlock(&cache->space_info->lock); |
8671 | ||
b742bb82 | 8672 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8673 | |
ea658bad | 8674 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8675 | |
d18a2c44 | 8676 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8677 | |
6324fbf3 CM |
8678 | return 0; |
8679 | } | |
1a40e23b | 8680 | |
10ea00f5 ID |
8681 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8682 | { | |
899c81ea ID |
8683 | u64 extra_flags = chunk_to_extended(flags) & |
8684 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8685 | |
de98ced9 | 8686 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8687 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8688 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8689 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8690 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8691 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8692 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8693 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8694 | } |
8695 | ||
1a40e23b ZY |
8696 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8697 | struct btrfs_root *root, u64 group_start) | |
8698 | { | |
8699 | struct btrfs_path *path; | |
8700 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8701 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8702 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8703 | struct btrfs_key key; |
0af3d00b | 8704 | struct inode *inode; |
1a40e23b | 8705 | int ret; |
10ea00f5 | 8706 | int index; |
89a55897 | 8707 | int factor; |
1a40e23b | 8708 | |
1a40e23b ZY |
8709 | root = root->fs_info->extent_root; |
8710 | ||
8711 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8712 | BUG_ON(!block_group); | |
c146afad | 8713 | BUG_ON(!block_group->ro); |
1a40e23b | 8714 | |
9f7c43c9 | 8715 | /* |
8716 | * Free the reserved super bytes from this block group before | |
8717 | * remove it. | |
8718 | */ | |
8719 | free_excluded_extents(root, block_group); | |
8720 | ||
1a40e23b | 8721 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8722 | index = get_block_group_index(block_group); |
89a55897 JB |
8723 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8724 | BTRFS_BLOCK_GROUP_RAID1 | | |
8725 | BTRFS_BLOCK_GROUP_RAID10)) | |
8726 | factor = 2; | |
8727 | else | |
8728 | factor = 1; | |
1a40e23b | 8729 | |
44fb5511 CM |
8730 | /* make sure this block group isn't part of an allocation cluster */ |
8731 | cluster = &root->fs_info->data_alloc_cluster; | |
8732 | spin_lock(&cluster->refill_lock); | |
8733 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8734 | spin_unlock(&cluster->refill_lock); | |
8735 | ||
8736 | /* | |
8737 | * make sure this block group isn't part of a metadata | |
8738 | * allocation cluster | |
8739 | */ | |
8740 | cluster = &root->fs_info->meta_alloc_cluster; | |
8741 | spin_lock(&cluster->refill_lock); | |
8742 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8743 | spin_unlock(&cluster->refill_lock); | |
8744 | ||
1a40e23b | 8745 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8746 | if (!path) { |
8747 | ret = -ENOMEM; | |
8748 | goto out; | |
8749 | } | |
1a40e23b | 8750 | |
10b2f34d | 8751 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8752 | if (!IS_ERR(inode)) { |
b532402e | 8753 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8754 | if (ret) { |
8755 | btrfs_add_delayed_iput(inode); | |
8756 | goto out; | |
8757 | } | |
0af3d00b JB |
8758 | clear_nlink(inode); |
8759 | /* One for the block groups ref */ | |
8760 | spin_lock(&block_group->lock); | |
8761 | if (block_group->iref) { | |
8762 | block_group->iref = 0; | |
8763 | block_group->inode = NULL; | |
8764 | spin_unlock(&block_group->lock); | |
8765 | iput(inode); | |
8766 | } else { | |
8767 | spin_unlock(&block_group->lock); | |
8768 | } | |
8769 | /* One for our lookup ref */ | |
455757c3 | 8770 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8771 | } |
8772 | ||
8773 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8774 | key.offset = block_group->key.objectid; | |
8775 | key.type = 0; | |
8776 | ||
8777 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8778 | if (ret < 0) | |
8779 | goto out; | |
8780 | if (ret > 0) | |
b3b4aa74 | 8781 | btrfs_release_path(path); |
0af3d00b JB |
8782 | if (ret == 0) { |
8783 | ret = btrfs_del_item(trans, tree_root, path); | |
8784 | if (ret) | |
8785 | goto out; | |
b3b4aa74 | 8786 | btrfs_release_path(path); |
0af3d00b JB |
8787 | } |
8788 | ||
3dfdb934 | 8789 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8790 | rb_erase(&block_group->cache_node, |
8791 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8792 | |
8793 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8794 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8795 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8796 | |
80eb234a | 8797 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8798 | /* |
8799 | * we must use list_del_init so people can check to see if they | |
8800 | * are still on the list after taking the semaphore | |
8801 | */ | |
8802 | list_del_init(&block_group->list); | |
6ab0a202 JM |
8803 | if (list_empty(&block_group->space_info->block_groups[index])) { |
8804 | kobject_del(&block_group->space_info->block_group_kobjs[index]); | |
8805 | kobject_put(&block_group->space_info->block_group_kobjs[index]); | |
10ea00f5 | 8806 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
6ab0a202 | 8807 | } |
80eb234a | 8808 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8809 | |
817d52f8 | 8810 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8811 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8812 | |
8813 | btrfs_remove_free_space_cache(block_group); | |
8814 | ||
c146afad YZ |
8815 | spin_lock(&block_group->space_info->lock); |
8816 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8817 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8818 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8819 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8820 | |
0af3d00b JB |
8821 | memcpy(&key, &block_group->key, sizeof(key)); |
8822 | ||
283bb197 | 8823 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8824 | |
fa9c0d79 CM |
8825 | btrfs_put_block_group(block_group); |
8826 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8827 | |
8828 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8829 | if (ret > 0) | |
8830 | ret = -EIO; | |
8831 | if (ret < 0) | |
8832 | goto out; | |
8833 | ||
8834 | ret = btrfs_del_item(trans, root, path); | |
8835 | out: | |
8836 | btrfs_free_path(path); | |
8837 | return ret; | |
8838 | } | |
acce952b | 8839 | |
c59021f8 | 8840 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8841 | { | |
8842 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8843 | struct btrfs_super_block *disk_super; |
8844 | u64 features; | |
8845 | u64 flags; | |
8846 | int mixed = 0; | |
c59021f8 | 8847 | int ret; |
8848 | ||
6c41761f | 8849 | disk_super = fs_info->super_copy; |
1aba86d6 | 8850 | if (!btrfs_super_root(disk_super)) |
8851 | return 1; | |
c59021f8 | 8852 | |
1aba86d6 | 8853 | features = btrfs_super_incompat_flags(disk_super); |
8854 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8855 | mixed = 1; | |
c59021f8 | 8856 | |
1aba86d6 | 8857 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8858 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8859 | if (ret) |
1aba86d6 | 8860 | goto out; |
c59021f8 | 8861 | |
1aba86d6 | 8862 | if (mixed) { |
8863 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8864 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8865 | } else { | |
8866 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8867 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8868 | if (ret) | |
8869 | goto out; | |
8870 | ||
8871 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8872 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8873 | } | |
8874 | out: | |
c59021f8 | 8875 | return ret; |
8876 | } | |
8877 | ||
acce952b | 8878 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8879 | { | |
8880 | return unpin_extent_range(root, start, end); | |
8881 | } | |
8882 | ||
8883 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8884 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8885 | { |
5378e607 | 8886 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8887 | } |
f7039b1d LD |
8888 | |
8889 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8890 | { | |
8891 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8892 | struct btrfs_block_group_cache *cache = NULL; | |
8893 | u64 group_trimmed; | |
8894 | u64 start; | |
8895 | u64 end; | |
8896 | u64 trimmed = 0; | |
2cac13e4 | 8897 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8898 | int ret = 0; |
8899 | ||
2cac13e4 LB |
8900 | /* |
8901 | * try to trim all FS space, our block group may start from non-zero. | |
8902 | */ | |
8903 | if (range->len == total_bytes) | |
8904 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8905 | else | |
8906 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8907 | |
8908 | while (cache) { | |
8909 | if (cache->key.objectid >= (range->start + range->len)) { | |
8910 | btrfs_put_block_group(cache); | |
8911 | break; | |
8912 | } | |
8913 | ||
8914 | start = max(range->start, cache->key.objectid); | |
8915 | end = min(range->start + range->len, | |
8916 | cache->key.objectid + cache->key.offset); | |
8917 | ||
8918 | if (end - start >= range->minlen) { | |
8919 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8920 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
8921 | if (ret) { |
8922 | btrfs_put_block_group(cache); | |
8923 | break; | |
8924 | } | |
8925 | ret = wait_block_group_cache_done(cache); | |
8926 | if (ret) { | |
8927 | btrfs_put_block_group(cache); | |
8928 | break; | |
8929 | } | |
f7039b1d LD |
8930 | } |
8931 | ret = btrfs_trim_block_group(cache, | |
8932 | &group_trimmed, | |
8933 | start, | |
8934 | end, | |
8935 | range->minlen); | |
8936 | ||
8937 | trimmed += group_trimmed; | |
8938 | if (ret) { | |
8939 | btrfs_put_block_group(cache); | |
8940 | break; | |
8941 | } | |
8942 | } | |
8943 | ||
8944 | cache = next_block_group(fs_info->tree_root, cache); | |
8945 | } | |
8946 | ||
8947 | range->len = trimmed; | |
8948 | return ret; | |
8949 | } |