Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
b150a4f1 | 27 | #include <linux/percpu_counter.h> |
4b4e25f2 | 28 | #include "compat.h" |
74493f7a | 29 | #include "hash.h" |
fec577fb CM |
30 | #include "ctree.h" |
31 | #include "disk-io.h" | |
32 | #include "print-tree.h" | |
e089f05c | 33 | #include "transaction.h" |
0b86a832 | 34 | #include "volumes.h" |
53b381b3 | 35 | #include "raid56.h" |
925baedd | 36 | #include "locking.h" |
fa9c0d79 | 37 | #include "free-space-cache.h" |
3fed40cc | 38 | #include "math.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 | |
0a3896d0 | 445 | if (need_resched()) { |
589d8ade | 446 | caching_ctl->progress = last; |
ff5714cc | 447 | btrfs_release_path(path); |
589d8ade JB |
448 | up_read(&fs_info->extent_commit_sem); |
449 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 450 | cond_resched(); |
589d8ade JB |
451 | goto again; |
452 | } | |
0a3896d0 JB |
453 | |
454 | ret = btrfs_next_leaf(extent_root, path); | |
455 | if (ret < 0) | |
456 | goto err; | |
457 | if (ret) | |
458 | break; | |
589d8ade JB |
459 | leaf = path->nodes[0]; |
460 | nritems = btrfs_header_nritems(leaf); | |
461 | continue; | |
11833d66 | 462 | } |
817d52f8 | 463 | |
52ee28d2 LB |
464 | if (key.objectid < last) { |
465 | key.objectid = last; | |
466 | key.offset = 0; | |
467 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
468 | ||
469 | caching_ctl->progress = last; | |
470 | btrfs_release_path(path); | |
471 | goto next; | |
472 | } | |
473 | ||
11833d66 YZ |
474 | if (key.objectid < block_group->key.objectid) { |
475 | path->slots[0]++; | |
817d52f8 | 476 | continue; |
e37c9e69 | 477 | } |
0f9dd46c | 478 | |
e37c9e69 | 479 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 480 | block_group->key.offset) |
e37c9e69 | 481 | break; |
7d7d6068 | 482 | |
3173a18f JB |
483 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
484 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
485 | total_found += add_new_free_space(block_group, |
486 | fs_info, last, | |
487 | key.objectid); | |
3173a18f JB |
488 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
489 | last = key.objectid + | |
490 | fs_info->tree_root->leafsize; | |
491 | else | |
492 | last = key.objectid + key.offset; | |
817d52f8 | 493 | |
11833d66 YZ |
494 | if (total_found > (1024 * 1024 * 2)) { |
495 | total_found = 0; | |
496 | wake_up(&caching_ctl->wait); | |
497 | } | |
817d52f8 | 498 | } |
e37c9e69 CM |
499 | path->slots[0]++; |
500 | } | |
817d52f8 | 501 | ret = 0; |
e37c9e69 | 502 | |
817d52f8 JB |
503 | total_found += add_new_free_space(block_group, fs_info, last, |
504 | block_group->key.objectid + | |
505 | block_group->key.offset); | |
11833d66 | 506 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
507 | |
508 | spin_lock(&block_group->lock); | |
11833d66 | 509 | block_group->caching_ctl = NULL; |
817d52f8 JB |
510 | block_group->cached = BTRFS_CACHE_FINISHED; |
511 | spin_unlock(&block_group->lock); | |
0f9dd46c | 512 | |
54aa1f4d | 513 | err: |
e37c9e69 | 514 | btrfs_free_path(path); |
276e680d | 515 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 516 | |
11833d66 YZ |
517 | free_excluded_extents(extent_root, block_group); |
518 | ||
519 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 520 | out: |
36cce922 JB |
521 | if (ret) { |
522 | spin_lock(&block_group->lock); | |
523 | block_group->caching_ctl = NULL; | |
524 | block_group->cached = BTRFS_CACHE_ERROR; | |
525 | spin_unlock(&block_group->lock); | |
526 | } | |
11833d66 YZ |
527 | wake_up(&caching_ctl->wait); |
528 | ||
529 | put_caching_control(caching_ctl); | |
11dfe35a | 530 | btrfs_put_block_group(block_group); |
817d52f8 JB |
531 | } |
532 | ||
9d66e233 | 533 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 534 | int load_cache_only) |
817d52f8 | 535 | { |
291c7d2f | 536 | DEFINE_WAIT(wait); |
11833d66 YZ |
537 | struct btrfs_fs_info *fs_info = cache->fs_info; |
538 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
539 | int ret = 0; |
540 | ||
291c7d2f | 541 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
542 | if (!caching_ctl) |
543 | return -ENOMEM; | |
291c7d2f JB |
544 | |
545 | INIT_LIST_HEAD(&caching_ctl->list); | |
546 | mutex_init(&caching_ctl->mutex); | |
547 | init_waitqueue_head(&caching_ctl->wait); | |
548 | caching_ctl->block_group = cache; | |
549 | caching_ctl->progress = cache->key.objectid; | |
550 | atomic_set(&caching_ctl->count, 1); | |
551 | caching_ctl->work.func = caching_thread; | |
552 | ||
553 | spin_lock(&cache->lock); | |
554 | /* | |
555 | * This should be a rare occasion, but this could happen I think in the | |
556 | * case where one thread starts to load the space cache info, and then | |
557 | * some other thread starts a transaction commit which tries to do an | |
558 | * allocation while the other thread is still loading the space cache | |
559 | * info. The previous loop should have kept us from choosing this block | |
560 | * group, but if we've moved to the state where we will wait on caching | |
561 | * block groups we need to first check if we're doing a fast load here, | |
562 | * so we can wait for it to finish, otherwise we could end up allocating | |
563 | * from a block group who's cache gets evicted for one reason or | |
564 | * another. | |
565 | */ | |
566 | while (cache->cached == BTRFS_CACHE_FAST) { | |
567 | struct btrfs_caching_control *ctl; | |
568 | ||
569 | ctl = cache->caching_ctl; | |
570 | atomic_inc(&ctl->count); | |
571 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
572 | spin_unlock(&cache->lock); | |
573 | ||
574 | schedule(); | |
575 | ||
576 | finish_wait(&ctl->wait, &wait); | |
577 | put_caching_control(ctl); | |
578 | spin_lock(&cache->lock); | |
579 | } | |
580 | ||
581 | if (cache->cached != BTRFS_CACHE_NO) { | |
582 | spin_unlock(&cache->lock); | |
583 | kfree(caching_ctl); | |
11833d66 | 584 | return 0; |
291c7d2f JB |
585 | } |
586 | WARN_ON(cache->caching_ctl); | |
587 | cache->caching_ctl = caching_ctl; | |
588 | cache->cached = BTRFS_CACHE_FAST; | |
589 | spin_unlock(&cache->lock); | |
11833d66 | 590 | |
d53ba474 | 591 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
592 | ret = load_free_space_cache(fs_info, cache); |
593 | ||
594 | spin_lock(&cache->lock); | |
595 | if (ret == 1) { | |
291c7d2f | 596 | cache->caching_ctl = NULL; |
9d66e233 JB |
597 | cache->cached = BTRFS_CACHE_FINISHED; |
598 | cache->last_byte_to_unpin = (u64)-1; | |
599 | } else { | |
291c7d2f JB |
600 | if (load_cache_only) { |
601 | cache->caching_ctl = NULL; | |
602 | cache->cached = BTRFS_CACHE_NO; | |
603 | } else { | |
604 | cache->cached = BTRFS_CACHE_STARTED; | |
605 | } | |
9d66e233 JB |
606 | } |
607 | spin_unlock(&cache->lock); | |
291c7d2f | 608 | wake_up(&caching_ctl->wait); |
3c14874a | 609 | if (ret == 1) { |
291c7d2f | 610 | put_caching_control(caching_ctl); |
3c14874a | 611 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 612 | return 0; |
3c14874a | 613 | } |
291c7d2f JB |
614 | } else { |
615 | /* | |
616 | * We are not going to do the fast caching, set cached to the | |
617 | * appropriate value and wakeup any waiters. | |
618 | */ | |
619 | spin_lock(&cache->lock); | |
620 | if (load_cache_only) { | |
621 | cache->caching_ctl = NULL; | |
622 | cache->cached = BTRFS_CACHE_NO; | |
623 | } else { | |
624 | cache->cached = BTRFS_CACHE_STARTED; | |
625 | } | |
626 | spin_unlock(&cache->lock); | |
627 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
628 | } |
629 | ||
291c7d2f JB |
630 | if (load_cache_only) { |
631 | put_caching_control(caching_ctl); | |
11833d66 | 632 | return 0; |
817d52f8 | 633 | } |
817d52f8 | 634 | |
11833d66 | 635 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 636 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
637 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
638 | up_write(&fs_info->extent_commit_sem); | |
639 | ||
11dfe35a | 640 | btrfs_get_block_group(cache); |
11833d66 | 641 | |
bab39bf9 | 642 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 643 | |
ef8bbdfe | 644 | return ret; |
e37c9e69 CM |
645 | } |
646 | ||
0f9dd46c JB |
647 | /* |
648 | * return the block group that starts at or after bytenr | |
649 | */ | |
d397712b CM |
650 | static struct btrfs_block_group_cache * |
651 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 652 | { |
0f9dd46c | 653 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 654 | |
0f9dd46c | 655 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 656 | |
0f9dd46c | 657 | return cache; |
0ef3e66b CM |
658 | } |
659 | ||
0f9dd46c | 660 | /* |
9f55684c | 661 | * return the block group that contains the given bytenr |
0f9dd46c | 662 | */ |
d397712b CM |
663 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
664 | struct btrfs_fs_info *info, | |
665 | u64 bytenr) | |
be744175 | 666 | { |
0f9dd46c | 667 | struct btrfs_block_group_cache *cache; |
be744175 | 668 | |
0f9dd46c | 669 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 670 | |
0f9dd46c | 671 | return cache; |
be744175 | 672 | } |
0b86a832 | 673 | |
0f9dd46c JB |
674 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
675 | u64 flags) | |
6324fbf3 | 676 | { |
0f9dd46c | 677 | struct list_head *head = &info->space_info; |
0f9dd46c | 678 | struct btrfs_space_info *found; |
4184ea7f | 679 | |
52ba6929 | 680 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 681 | |
4184ea7f CM |
682 | rcu_read_lock(); |
683 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 684 | if (found->flags & flags) { |
4184ea7f | 685 | rcu_read_unlock(); |
0f9dd46c | 686 | return found; |
4184ea7f | 687 | } |
0f9dd46c | 688 | } |
4184ea7f | 689 | rcu_read_unlock(); |
0f9dd46c | 690 | return NULL; |
6324fbf3 CM |
691 | } |
692 | ||
4184ea7f CM |
693 | /* |
694 | * after adding space to the filesystem, we need to clear the full flags | |
695 | * on all the space infos. | |
696 | */ | |
697 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
698 | { | |
699 | struct list_head *head = &info->space_info; | |
700 | struct btrfs_space_info *found; | |
701 | ||
702 | rcu_read_lock(); | |
703 | list_for_each_entry_rcu(found, head, list) | |
704 | found->full = 0; | |
705 | rcu_read_unlock(); | |
706 | } | |
707 | ||
e02119d5 | 708 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 709 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
710 | { |
711 | int ret; | |
712 | struct btrfs_key key; | |
31840ae1 | 713 | struct btrfs_path *path; |
e02119d5 | 714 | |
31840ae1 | 715 | path = btrfs_alloc_path(); |
d8926bb3 MF |
716 | if (!path) |
717 | return -ENOMEM; | |
718 | ||
e02119d5 CM |
719 | key.objectid = start; |
720 | key.offset = len; | |
3173a18f | 721 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
722 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
723 | 0, 0); | |
3173a18f JB |
724 | if (ret > 0) { |
725 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
726 | if (key.objectid == start && | |
727 | key.type == BTRFS_METADATA_ITEM_KEY) | |
728 | ret = 0; | |
729 | } | |
31840ae1 | 730 | btrfs_free_path(path); |
7bb86316 CM |
731 | return ret; |
732 | } | |
733 | ||
a22285a6 | 734 | /* |
3173a18f | 735 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
736 | * |
737 | * the head node for delayed ref is used to store the sum of all the | |
738 | * reference count modifications queued up in the rbtree. the head | |
739 | * node may also store the extent flags to set. This way you can check | |
740 | * to see what the reference count and extent flags would be if all of | |
741 | * the delayed refs are not processed. | |
742 | */ | |
743 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
744 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 745 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
746 | { |
747 | struct btrfs_delayed_ref_head *head; | |
748 | struct btrfs_delayed_ref_root *delayed_refs; | |
749 | struct btrfs_path *path; | |
750 | struct btrfs_extent_item *ei; | |
751 | struct extent_buffer *leaf; | |
752 | struct btrfs_key key; | |
753 | u32 item_size; | |
754 | u64 num_refs; | |
755 | u64 extent_flags; | |
756 | int ret; | |
757 | ||
3173a18f JB |
758 | /* |
759 | * If we don't have skinny metadata, don't bother doing anything | |
760 | * different | |
761 | */ | |
762 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
763 | offset = root->leafsize; | |
764 | metadata = 0; | |
765 | } | |
766 | ||
a22285a6 YZ |
767 | path = btrfs_alloc_path(); |
768 | if (!path) | |
769 | return -ENOMEM; | |
770 | ||
3173a18f JB |
771 | if (metadata) { |
772 | key.objectid = bytenr; | |
773 | key.type = BTRFS_METADATA_ITEM_KEY; | |
774 | key.offset = offset; | |
775 | } else { | |
776 | key.objectid = bytenr; | |
777 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
778 | key.offset = offset; | |
779 | } | |
780 | ||
a22285a6 YZ |
781 | if (!trans) { |
782 | path->skip_locking = 1; | |
783 | path->search_commit_root = 1; | |
784 | } | |
785 | again: | |
786 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
787 | &key, path, 0, 0); | |
788 | if (ret < 0) | |
789 | goto out_free; | |
790 | ||
3173a18f | 791 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
792 | metadata = 0; |
793 | if (path->slots[0]) { | |
794 | path->slots[0]--; | |
795 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
796 | path->slots[0]); | |
797 | if (key.objectid == bytenr && | |
798 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
799 | key.offset == root->leafsize) | |
800 | ret = 0; | |
801 | } | |
802 | if (ret) { | |
803 | key.objectid = bytenr; | |
804 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
805 | key.offset = root->leafsize; | |
806 | btrfs_release_path(path); | |
807 | goto again; | |
808 | } | |
3173a18f JB |
809 | } |
810 | ||
a22285a6 YZ |
811 | if (ret == 0) { |
812 | leaf = path->nodes[0]; | |
813 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
814 | if (item_size >= sizeof(*ei)) { | |
815 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
816 | struct btrfs_extent_item); | |
817 | num_refs = btrfs_extent_refs(leaf, ei); | |
818 | extent_flags = btrfs_extent_flags(leaf, ei); | |
819 | } else { | |
820 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
821 | struct btrfs_extent_item_v0 *ei0; | |
822 | BUG_ON(item_size != sizeof(*ei0)); | |
823 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
824 | struct btrfs_extent_item_v0); | |
825 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
826 | /* FIXME: this isn't correct for data */ | |
827 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
828 | #else | |
829 | BUG(); | |
830 | #endif | |
831 | } | |
832 | BUG_ON(num_refs == 0); | |
833 | } else { | |
834 | num_refs = 0; | |
835 | extent_flags = 0; | |
836 | ret = 0; | |
837 | } | |
838 | ||
839 | if (!trans) | |
840 | goto out; | |
841 | ||
842 | delayed_refs = &trans->transaction->delayed_refs; | |
843 | spin_lock(&delayed_refs->lock); | |
844 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
845 | if (head) { | |
846 | if (!mutex_trylock(&head->mutex)) { | |
847 | atomic_inc(&head->node.refs); | |
848 | spin_unlock(&delayed_refs->lock); | |
849 | ||
b3b4aa74 | 850 | btrfs_release_path(path); |
a22285a6 | 851 | |
8cc33e5c DS |
852 | /* |
853 | * Mutex was contended, block until it's released and try | |
854 | * again | |
855 | */ | |
a22285a6 YZ |
856 | mutex_lock(&head->mutex); |
857 | mutex_unlock(&head->mutex); | |
858 | btrfs_put_delayed_ref(&head->node); | |
859 | goto again; | |
860 | } | |
861 | if (head->extent_op && head->extent_op->update_flags) | |
862 | extent_flags |= head->extent_op->flags_to_set; | |
863 | else | |
864 | BUG_ON(num_refs == 0); | |
865 | ||
866 | num_refs += head->node.ref_mod; | |
867 | mutex_unlock(&head->mutex); | |
868 | } | |
869 | spin_unlock(&delayed_refs->lock); | |
870 | out: | |
871 | WARN_ON(num_refs == 0); | |
872 | if (refs) | |
873 | *refs = num_refs; | |
874 | if (flags) | |
875 | *flags = extent_flags; | |
876 | out_free: | |
877 | btrfs_free_path(path); | |
878 | return ret; | |
879 | } | |
880 | ||
d8d5f3e1 CM |
881 | /* |
882 | * Back reference rules. Back refs have three main goals: | |
883 | * | |
884 | * 1) differentiate between all holders of references to an extent so that | |
885 | * when a reference is dropped we can make sure it was a valid reference | |
886 | * before freeing the extent. | |
887 | * | |
888 | * 2) Provide enough information to quickly find the holders of an extent | |
889 | * if we notice a given block is corrupted or bad. | |
890 | * | |
891 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
892 | * maintenance. This is actually the same as #2, but with a slightly | |
893 | * different use case. | |
894 | * | |
5d4f98a2 YZ |
895 | * There are two kinds of back refs. The implicit back refs is optimized |
896 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
897 | * back refs of this kind provide information about the block's owner tree | |
898 | * and the pointer's key. These information allow us to find the block by | |
899 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
900 | * referenced by their owner trees. The location of tree block is recorded | |
901 | * in the back refs. Actually the full back refs is generic, and can be | |
902 | * used in all cases the implicit back refs is used. The major shortcoming | |
903 | * of the full back refs is its overhead. Every time a tree block gets | |
904 | * COWed, we have to update back refs entry for all pointers in it. | |
905 | * | |
906 | * For a newly allocated tree block, we use implicit back refs for | |
907 | * pointers in it. This means most tree related operations only involve | |
908 | * implicit back refs. For a tree block created in old transaction, the | |
909 | * only way to drop a reference to it is COW it. So we can detect the | |
910 | * event that tree block loses its owner tree's reference and do the | |
911 | * back refs conversion. | |
912 | * | |
913 | * When a tree block is COW'd through a tree, there are four cases: | |
914 | * | |
915 | * The reference count of the block is one and the tree is the block's | |
916 | * owner tree. Nothing to do in this case. | |
917 | * | |
918 | * The reference count of the block is one and the tree is not the | |
919 | * block's owner tree. In this case, full back refs is used for pointers | |
920 | * in the block. Remove these full back refs, add implicit back refs for | |
921 | * every pointers in the new block. | |
922 | * | |
923 | * The reference count of the block is greater than one and the tree is | |
924 | * the block's owner tree. In this case, implicit back refs is used for | |
925 | * pointers in the block. Add full back refs for every pointers in the | |
926 | * block, increase lower level extents' reference counts. The original | |
927 | * implicit back refs are entailed to the new block. | |
928 | * | |
929 | * The reference count of the block is greater than one and the tree is | |
930 | * not the block's owner tree. Add implicit back refs for every pointer in | |
931 | * the new block, increase lower level extents' reference count. | |
932 | * | |
933 | * Back Reference Key composing: | |
934 | * | |
935 | * The key objectid corresponds to the first byte in the extent, | |
936 | * The key type is used to differentiate between types of back refs. | |
937 | * There are different meanings of the key offset for different types | |
938 | * of back refs. | |
939 | * | |
d8d5f3e1 CM |
940 | * File extents can be referenced by: |
941 | * | |
942 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 943 | * - different files inside a single subvolume |
d8d5f3e1 CM |
944 | * - different offsets inside a file (bookend extents in file.c) |
945 | * | |
5d4f98a2 | 946 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
947 | * |
948 | * - Objectid of the subvolume root | |
d8d5f3e1 | 949 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
950 | * - original offset in the file |
951 | * - how many bookend extents | |
d8d5f3e1 | 952 | * |
5d4f98a2 YZ |
953 | * The key offset for the implicit back refs is hash of the first |
954 | * three fields. | |
d8d5f3e1 | 955 | * |
5d4f98a2 | 956 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 957 | * |
5d4f98a2 | 958 | * - number of pointers in the tree leaf |
d8d5f3e1 | 959 | * |
5d4f98a2 YZ |
960 | * The key offset for the implicit back refs is the first byte of |
961 | * the tree leaf | |
d8d5f3e1 | 962 | * |
5d4f98a2 YZ |
963 | * When a file extent is allocated, The implicit back refs is used. |
964 | * the fields are filled in: | |
d8d5f3e1 | 965 | * |
5d4f98a2 | 966 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 967 | * |
5d4f98a2 YZ |
968 | * When a file extent is removed file truncation, we find the |
969 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 970 | * |
5d4f98a2 | 971 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 972 | * |
5d4f98a2 | 973 | * Btree extents can be referenced by: |
d8d5f3e1 | 974 | * |
5d4f98a2 | 975 | * - Different subvolumes |
d8d5f3e1 | 976 | * |
5d4f98a2 YZ |
977 | * Both the implicit back refs and the full back refs for tree blocks |
978 | * only consist of key. The key offset for the implicit back refs is | |
979 | * objectid of block's owner tree. The key offset for the full back refs | |
980 | * is the first byte of parent block. | |
d8d5f3e1 | 981 | * |
5d4f98a2 YZ |
982 | * When implicit back refs is used, information about the lowest key and |
983 | * level of the tree block are required. These information are stored in | |
984 | * tree block info structure. | |
d8d5f3e1 | 985 | */ |
31840ae1 | 986 | |
5d4f98a2 YZ |
987 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
988 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
989 | struct btrfs_root *root, | |
990 | struct btrfs_path *path, | |
991 | u64 owner, u32 extra_size) | |
7bb86316 | 992 | { |
5d4f98a2 YZ |
993 | struct btrfs_extent_item *item; |
994 | struct btrfs_extent_item_v0 *ei0; | |
995 | struct btrfs_extent_ref_v0 *ref0; | |
996 | struct btrfs_tree_block_info *bi; | |
997 | struct extent_buffer *leaf; | |
7bb86316 | 998 | struct btrfs_key key; |
5d4f98a2 YZ |
999 | struct btrfs_key found_key; |
1000 | u32 new_size = sizeof(*item); | |
1001 | u64 refs; | |
1002 | int ret; | |
1003 | ||
1004 | leaf = path->nodes[0]; | |
1005 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
1006 | ||
1007 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1008 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1009 | struct btrfs_extent_item_v0); | |
1010 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1011 | ||
1012 | if (owner == (u64)-1) { | |
1013 | while (1) { | |
1014 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1015 | ret = btrfs_next_leaf(root, path); | |
1016 | if (ret < 0) | |
1017 | return ret; | |
79787eaa | 1018 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1019 | leaf = path->nodes[0]; |
1020 | } | |
1021 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1022 | path->slots[0]); | |
1023 | BUG_ON(key.objectid != found_key.objectid); | |
1024 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1025 | path->slots[0]++; | |
1026 | continue; | |
1027 | } | |
1028 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1029 | struct btrfs_extent_ref_v0); | |
1030 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1031 | break; | |
1032 | } | |
1033 | } | |
b3b4aa74 | 1034 | btrfs_release_path(path); |
5d4f98a2 YZ |
1035 | |
1036 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1037 | new_size += sizeof(*bi); | |
1038 | ||
1039 | new_size -= sizeof(*ei0); | |
1040 | ret = btrfs_search_slot(trans, root, &key, path, | |
1041 | new_size + extra_size, 1); | |
1042 | if (ret < 0) | |
1043 | return ret; | |
79787eaa | 1044 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1045 | |
4b90c680 | 1046 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1047 | |
1048 | leaf = path->nodes[0]; | |
1049 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1050 | btrfs_set_extent_refs(leaf, item, refs); | |
1051 | /* FIXME: get real generation */ | |
1052 | btrfs_set_extent_generation(leaf, item, 0); | |
1053 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1054 | btrfs_set_extent_flags(leaf, item, | |
1055 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1056 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1057 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1058 | /* FIXME: get first key of the block */ | |
1059 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1060 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1061 | } else { | |
1062 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1063 | } | |
1064 | btrfs_mark_buffer_dirty(leaf); | |
1065 | return 0; | |
1066 | } | |
1067 | #endif | |
1068 | ||
1069 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1070 | { | |
1071 | u32 high_crc = ~(u32)0; | |
1072 | u32 low_crc = ~(u32)0; | |
1073 | __le64 lenum; | |
1074 | ||
1075 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1076 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1077 | lenum = cpu_to_le64(owner); |
163e783e | 1078 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1079 | lenum = cpu_to_le64(offset); |
163e783e | 1080 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1081 | |
1082 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1083 | } | |
1084 | ||
1085 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1086 | struct btrfs_extent_data_ref *ref) | |
1087 | { | |
1088 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1089 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1090 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1091 | } | |
1092 | ||
1093 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1094 | struct btrfs_extent_data_ref *ref, | |
1095 | u64 root_objectid, u64 owner, u64 offset) | |
1096 | { | |
1097 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1098 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1099 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1100 | return 0; | |
1101 | return 1; | |
1102 | } | |
1103 | ||
1104 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1105 | struct btrfs_root *root, | |
1106 | struct btrfs_path *path, | |
1107 | u64 bytenr, u64 parent, | |
1108 | u64 root_objectid, | |
1109 | u64 owner, u64 offset) | |
1110 | { | |
1111 | struct btrfs_key key; | |
1112 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1113 | struct extent_buffer *leaf; |
5d4f98a2 | 1114 | u32 nritems; |
74493f7a | 1115 | int ret; |
5d4f98a2 YZ |
1116 | int recow; |
1117 | int err = -ENOENT; | |
74493f7a | 1118 | |
31840ae1 | 1119 | key.objectid = bytenr; |
5d4f98a2 YZ |
1120 | if (parent) { |
1121 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1122 | key.offset = parent; | |
1123 | } else { | |
1124 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1125 | key.offset = hash_extent_data_ref(root_objectid, | |
1126 | owner, offset); | |
1127 | } | |
1128 | again: | |
1129 | recow = 0; | |
1130 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1131 | if (ret < 0) { | |
1132 | err = ret; | |
1133 | goto fail; | |
1134 | } | |
31840ae1 | 1135 | |
5d4f98a2 YZ |
1136 | if (parent) { |
1137 | if (!ret) | |
1138 | return 0; | |
1139 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1140 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1141 | btrfs_release_path(path); |
5d4f98a2 YZ |
1142 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1143 | if (ret < 0) { | |
1144 | err = ret; | |
1145 | goto fail; | |
1146 | } | |
1147 | if (!ret) | |
1148 | return 0; | |
1149 | #endif | |
1150 | goto fail; | |
31840ae1 ZY |
1151 | } |
1152 | ||
1153 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1154 | nritems = btrfs_header_nritems(leaf); |
1155 | while (1) { | |
1156 | if (path->slots[0] >= nritems) { | |
1157 | ret = btrfs_next_leaf(root, path); | |
1158 | if (ret < 0) | |
1159 | err = ret; | |
1160 | if (ret) | |
1161 | goto fail; | |
1162 | ||
1163 | leaf = path->nodes[0]; | |
1164 | nritems = btrfs_header_nritems(leaf); | |
1165 | recow = 1; | |
1166 | } | |
1167 | ||
1168 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1169 | if (key.objectid != bytenr || | |
1170 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1171 | goto fail; | |
1172 | ||
1173 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1174 | struct btrfs_extent_data_ref); | |
1175 | ||
1176 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1177 | owner, offset)) { | |
1178 | if (recow) { | |
b3b4aa74 | 1179 | btrfs_release_path(path); |
5d4f98a2 YZ |
1180 | goto again; |
1181 | } | |
1182 | err = 0; | |
1183 | break; | |
1184 | } | |
1185 | path->slots[0]++; | |
31840ae1 | 1186 | } |
5d4f98a2 YZ |
1187 | fail: |
1188 | return err; | |
31840ae1 ZY |
1189 | } |
1190 | ||
5d4f98a2 YZ |
1191 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1192 | struct btrfs_root *root, | |
1193 | struct btrfs_path *path, | |
1194 | u64 bytenr, u64 parent, | |
1195 | u64 root_objectid, u64 owner, | |
1196 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1197 | { |
1198 | struct btrfs_key key; | |
1199 | struct extent_buffer *leaf; | |
5d4f98a2 | 1200 | u32 size; |
31840ae1 ZY |
1201 | u32 num_refs; |
1202 | int ret; | |
74493f7a | 1203 | |
74493f7a | 1204 | key.objectid = bytenr; |
5d4f98a2 YZ |
1205 | if (parent) { |
1206 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1207 | key.offset = parent; | |
1208 | size = sizeof(struct btrfs_shared_data_ref); | |
1209 | } else { | |
1210 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1211 | key.offset = hash_extent_data_ref(root_objectid, | |
1212 | owner, offset); | |
1213 | size = sizeof(struct btrfs_extent_data_ref); | |
1214 | } | |
74493f7a | 1215 | |
5d4f98a2 YZ |
1216 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1217 | if (ret && ret != -EEXIST) | |
1218 | goto fail; | |
1219 | ||
1220 | leaf = path->nodes[0]; | |
1221 | if (parent) { | |
1222 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1223 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1224 | struct btrfs_shared_data_ref); |
1225 | if (ret == 0) { | |
1226 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1227 | } else { | |
1228 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1229 | num_refs += refs_to_add; | |
1230 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1231 | } |
5d4f98a2 YZ |
1232 | } else { |
1233 | struct btrfs_extent_data_ref *ref; | |
1234 | while (ret == -EEXIST) { | |
1235 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1236 | struct btrfs_extent_data_ref); | |
1237 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1238 | owner, offset)) | |
1239 | break; | |
b3b4aa74 | 1240 | btrfs_release_path(path); |
5d4f98a2 YZ |
1241 | key.offset++; |
1242 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1243 | size); | |
1244 | if (ret && ret != -EEXIST) | |
1245 | goto fail; | |
31840ae1 | 1246 | |
5d4f98a2 YZ |
1247 | leaf = path->nodes[0]; |
1248 | } | |
1249 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1250 | struct btrfs_extent_data_ref); | |
1251 | if (ret == 0) { | |
1252 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1253 | root_objectid); | |
1254 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1255 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1256 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1257 | } else { | |
1258 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1259 | num_refs += refs_to_add; | |
1260 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1261 | } |
31840ae1 | 1262 | } |
5d4f98a2 YZ |
1263 | btrfs_mark_buffer_dirty(leaf); |
1264 | ret = 0; | |
1265 | fail: | |
b3b4aa74 | 1266 | btrfs_release_path(path); |
7bb86316 | 1267 | return ret; |
74493f7a CM |
1268 | } |
1269 | ||
5d4f98a2 YZ |
1270 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1271 | struct btrfs_root *root, | |
1272 | struct btrfs_path *path, | |
1273 | int refs_to_drop) | |
31840ae1 | 1274 | { |
5d4f98a2 YZ |
1275 | struct btrfs_key key; |
1276 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1277 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1278 | struct extent_buffer *leaf; |
5d4f98a2 | 1279 | u32 num_refs = 0; |
31840ae1 ZY |
1280 | int ret = 0; |
1281 | ||
1282 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1283 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1284 | ||
1285 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1286 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1287 | struct btrfs_extent_data_ref); | |
1288 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1289 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1290 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1291 | struct btrfs_shared_data_ref); | |
1292 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1293 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1294 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1295 | struct btrfs_extent_ref_v0 *ref0; | |
1296 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1297 | struct btrfs_extent_ref_v0); | |
1298 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1299 | #endif | |
1300 | } else { | |
1301 | BUG(); | |
1302 | } | |
1303 | ||
56bec294 CM |
1304 | BUG_ON(num_refs < refs_to_drop); |
1305 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1306 | |
31840ae1 ZY |
1307 | if (num_refs == 0) { |
1308 | ret = btrfs_del_item(trans, root, path); | |
1309 | } else { | |
5d4f98a2 YZ |
1310 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1311 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1312 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1313 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1314 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1315 | else { | |
1316 | struct btrfs_extent_ref_v0 *ref0; | |
1317 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1318 | struct btrfs_extent_ref_v0); | |
1319 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1320 | } | |
1321 | #endif | |
31840ae1 ZY |
1322 | btrfs_mark_buffer_dirty(leaf); |
1323 | } | |
31840ae1 ZY |
1324 | return ret; |
1325 | } | |
1326 | ||
5d4f98a2 YZ |
1327 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1328 | struct btrfs_path *path, | |
1329 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1330 | { |
5d4f98a2 YZ |
1331 | struct btrfs_key key; |
1332 | struct extent_buffer *leaf; | |
1333 | struct btrfs_extent_data_ref *ref1; | |
1334 | struct btrfs_shared_data_ref *ref2; | |
1335 | u32 num_refs = 0; | |
1336 | ||
1337 | leaf = path->nodes[0]; | |
1338 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1339 | if (iref) { | |
1340 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1341 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1342 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1343 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1344 | } else { | |
1345 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1346 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1347 | } | |
1348 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1349 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1350 | struct btrfs_extent_data_ref); | |
1351 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1352 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1353 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1354 | struct btrfs_shared_data_ref); | |
1355 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1356 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1357 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1358 | struct btrfs_extent_ref_v0 *ref0; | |
1359 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1360 | struct btrfs_extent_ref_v0); | |
1361 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1362 | #endif |
5d4f98a2 YZ |
1363 | } else { |
1364 | WARN_ON(1); | |
1365 | } | |
1366 | return num_refs; | |
1367 | } | |
15916de8 | 1368 | |
5d4f98a2 YZ |
1369 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1370 | struct btrfs_root *root, | |
1371 | struct btrfs_path *path, | |
1372 | u64 bytenr, u64 parent, | |
1373 | u64 root_objectid) | |
1f3c79a2 | 1374 | { |
5d4f98a2 | 1375 | struct btrfs_key key; |
1f3c79a2 | 1376 | int ret; |
1f3c79a2 | 1377 | |
5d4f98a2 YZ |
1378 | key.objectid = bytenr; |
1379 | if (parent) { | |
1380 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1381 | key.offset = parent; | |
1382 | } else { | |
1383 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1384 | key.offset = root_objectid; | |
1f3c79a2 LH |
1385 | } |
1386 | ||
5d4f98a2 YZ |
1387 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1388 | if (ret > 0) | |
1389 | ret = -ENOENT; | |
1390 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1391 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1392 | btrfs_release_path(path); |
5d4f98a2 YZ |
1393 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1394 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1395 | if (ret > 0) | |
1396 | ret = -ENOENT; | |
1397 | } | |
1f3c79a2 | 1398 | #endif |
5d4f98a2 | 1399 | return ret; |
1f3c79a2 LH |
1400 | } |
1401 | ||
5d4f98a2 YZ |
1402 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1403 | struct btrfs_root *root, | |
1404 | struct btrfs_path *path, | |
1405 | u64 bytenr, u64 parent, | |
1406 | u64 root_objectid) | |
31840ae1 | 1407 | { |
5d4f98a2 | 1408 | struct btrfs_key key; |
31840ae1 | 1409 | int ret; |
31840ae1 | 1410 | |
5d4f98a2 YZ |
1411 | key.objectid = bytenr; |
1412 | if (parent) { | |
1413 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1414 | key.offset = parent; | |
1415 | } else { | |
1416 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1417 | key.offset = root_objectid; | |
1418 | } | |
1419 | ||
1420 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1421 | btrfs_release_path(path); |
31840ae1 ZY |
1422 | return ret; |
1423 | } | |
1424 | ||
5d4f98a2 | 1425 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1426 | { |
5d4f98a2 YZ |
1427 | int type; |
1428 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1429 | if (parent > 0) | |
1430 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1431 | else | |
1432 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1433 | } else { | |
1434 | if (parent > 0) | |
1435 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1436 | else | |
1437 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1438 | } | |
1439 | return type; | |
31840ae1 | 1440 | } |
56bec294 | 1441 | |
2c47e605 YZ |
1442 | static int find_next_key(struct btrfs_path *path, int level, |
1443 | struct btrfs_key *key) | |
56bec294 | 1444 | |
02217ed2 | 1445 | { |
2c47e605 | 1446 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1447 | if (!path->nodes[level]) |
1448 | break; | |
5d4f98a2 YZ |
1449 | if (path->slots[level] + 1 >= |
1450 | btrfs_header_nritems(path->nodes[level])) | |
1451 | continue; | |
1452 | if (level == 0) | |
1453 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1454 | path->slots[level] + 1); | |
1455 | else | |
1456 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1457 | path->slots[level] + 1); | |
1458 | return 0; | |
1459 | } | |
1460 | return 1; | |
1461 | } | |
037e6390 | 1462 | |
5d4f98a2 YZ |
1463 | /* |
1464 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1465 | * to the address of inline back ref, and 0 is returned. | |
1466 | * | |
1467 | * if back ref isn't found, *ref_ret is set to the address where it | |
1468 | * should be inserted, and -ENOENT is returned. | |
1469 | * | |
1470 | * if insert is true and there are too many inline back refs, the path | |
1471 | * points to the extent item, and -EAGAIN is returned. | |
1472 | * | |
1473 | * NOTE: inline back refs are ordered in the same way that back ref | |
1474 | * items in the tree are ordered. | |
1475 | */ | |
1476 | static noinline_for_stack | |
1477 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1478 | struct btrfs_root *root, | |
1479 | struct btrfs_path *path, | |
1480 | struct btrfs_extent_inline_ref **ref_ret, | |
1481 | u64 bytenr, u64 num_bytes, | |
1482 | u64 parent, u64 root_objectid, | |
1483 | u64 owner, u64 offset, int insert) | |
1484 | { | |
1485 | struct btrfs_key key; | |
1486 | struct extent_buffer *leaf; | |
1487 | struct btrfs_extent_item *ei; | |
1488 | struct btrfs_extent_inline_ref *iref; | |
1489 | u64 flags; | |
1490 | u64 item_size; | |
1491 | unsigned long ptr; | |
1492 | unsigned long end; | |
1493 | int extra_size; | |
1494 | int type; | |
1495 | int want; | |
1496 | int ret; | |
1497 | int err = 0; | |
3173a18f JB |
1498 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1499 | SKINNY_METADATA); | |
26b8003f | 1500 | |
db94535d | 1501 | key.objectid = bytenr; |
31840ae1 | 1502 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1503 | key.offset = num_bytes; |
31840ae1 | 1504 | |
5d4f98a2 YZ |
1505 | want = extent_ref_type(parent, owner); |
1506 | if (insert) { | |
1507 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1508 | path->keep_locks = 1; |
5d4f98a2 YZ |
1509 | } else |
1510 | extra_size = -1; | |
3173a18f JB |
1511 | |
1512 | /* | |
1513 | * Owner is our parent level, so we can just add one to get the level | |
1514 | * for the block we are interested in. | |
1515 | */ | |
1516 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1517 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1518 | key.offset = owner; | |
1519 | } | |
1520 | ||
1521 | again: | |
5d4f98a2 | 1522 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1523 | if (ret < 0) { |
5d4f98a2 YZ |
1524 | err = ret; |
1525 | goto out; | |
1526 | } | |
3173a18f JB |
1527 | |
1528 | /* | |
1529 | * We may be a newly converted file system which still has the old fat | |
1530 | * extent entries for metadata, so try and see if we have one of those. | |
1531 | */ | |
1532 | if (ret > 0 && skinny_metadata) { | |
1533 | skinny_metadata = false; | |
1534 | if (path->slots[0]) { | |
1535 | path->slots[0]--; | |
1536 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1537 | path->slots[0]); | |
1538 | if (key.objectid == bytenr && | |
1539 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1540 | key.offset == num_bytes) | |
1541 | ret = 0; | |
1542 | } | |
1543 | if (ret) { | |
1544 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1545 | key.offset = num_bytes; | |
1546 | btrfs_release_path(path); | |
1547 | goto again; | |
1548 | } | |
1549 | } | |
1550 | ||
79787eaa JM |
1551 | if (ret && !insert) { |
1552 | err = -ENOENT; | |
1553 | goto out; | |
492104c8 JB |
1554 | } else if (ret) { |
1555 | err = -EIO; | |
1556 | WARN_ON(1); | |
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; | |
1982 | int err = 0; | |
1983 | ||
1984 | path = btrfs_alloc_path(); | |
1985 | if (!path) | |
1986 | return -ENOMEM; | |
1987 | ||
1988 | path->reada = 1; | |
1989 | path->leave_spinning = 1; | |
1990 | /* this will setup the path even if it fails to insert the back ref */ | |
1991 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1992 | path, bytenr, num_bytes, parent, | |
1993 | root_objectid, owner, offset, | |
1994 | refs_to_add, extent_op); | |
1995 | if (ret == 0) | |
1996 | goto out; | |
1997 | ||
1998 | if (ret != -EAGAIN) { | |
1999 | err = ret; | |
2000 | goto out; | |
2001 | } | |
2002 | ||
2003 | leaf = path->nodes[0]; | |
2004 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2005 | refs = btrfs_extent_refs(leaf, item); | |
2006 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2007 | if (extent_op) | |
2008 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2009 | |
5d4f98a2 | 2010 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2011 | btrfs_release_path(path); |
56bec294 CM |
2012 | |
2013 | path->reada = 1; | |
b9473439 CM |
2014 | path->leave_spinning = 1; |
2015 | ||
56bec294 CM |
2016 | /* now insert the actual backref */ |
2017 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
2018 | path, bytenr, parent, root_objectid, |
2019 | owner, offset, refs_to_add); | |
79787eaa JM |
2020 | if (ret) |
2021 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 2022 | out: |
56bec294 | 2023 | btrfs_free_path(path); |
5d4f98a2 | 2024 | return err; |
56bec294 CM |
2025 | } |
2026 | ||
5d4f98a2 YZ |
2027 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2028 | struct btrfs_root *root, | |
2029 | struct btrfs_delayed_ref_node *node, | |
2030 | struct btrfs_delayed_extent_op *extent_op, | |
2031 | int insert_reserved) | |
56bec294 | 2032 | { |
5d4f98a2 YZ |
2033 | int ret = 0; |
2034 | struct btrfs_delayed_data_ref *ref; | |
2035 | struct btrfs_key ins; | |
2036 | u64 parent = 0; | |
2037 | u64 ref_root = 0; | |
2038 | u64 flags = 0; | |
2039 | ||
2040 | ins.objectid = node->bytenr; | |
2041 | ins.offset = node->num_bytes; | |
2042 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2043 | ||
2044 | ref = btrfs_delayed_node_to_data_ref(node); | |
599c75ec LB |
2045 | trace_run_delayed_data_ref(node, ref, node->action); |
2046 | ||
5d4f98a2 YZ |
2047 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2048 | parent = ref->parent; | |
2049 | else | |
2050 | ref_root = ref->root; | |
2051 | ||
2052 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2053 | if (extent_op) |
5d4f98a2 | 2054 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2055 | ret = alloc_reserved_file_extent(trans, root, |
2056 | parent, ref_root, flags, | |
2057 | ref->objectid, ref->offset, | |
2058 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
2059 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2060 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2061 | node->num_bytes, parent, | |
2062 | ref_root, ref->objectid, | |
2063 | ref->offset, node->ref_mod, | |
2064 | extent_op); | |
2065 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2066 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2067 | node->num_bytes, parent, | |
2068 | ref_root, ref->objectid, | |
2069 | ref->offset, node->ref_mod, | |
2070 | extent_op); | |
2071 | } else { | |
2072 | BUG(); | |
2073 | } | |
2074 | return ret; | |
2075 | } | |
2076 | ||
2077 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2078 | struct extent_buffer *leaf, | |
2079 | struct btrfs_extent_item *ei) | |
2080 | { | |
2081 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2082 | if (extent_op->update_flags) { | |
2083 | flags |= extent_op->flags_to_set; | |
2084 | btrfs_set_extent_flags(leaf, ei, flags); | |
2085 | } | |
2086 | ||
2087 | if (extent_op->update_key) { | |
2088 | struct btrfs_tree_block_info *bi; | |
2089 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2090 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2091 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2092 | } | |
2093 | } | |
2094 | ||
2095 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2096 | struct btrfs_root *root, | |
2097 | struct btrfs_delayed_ref_node *node, | |
2098 | struct btrfs_delayed_extent_op *extent_op) | |
2099 | { | |
2100 | struct btrfs_key key; | |
2101 | struct btrfs_path *path; | |
2102 | struct btrfs_extent_item *ei; | |
2103 | struct extent_buffer *leaf; | |
2104 | u32 item_size; | |
56bec294 | 2105 | int ret; |
5d4f98a2 | 2106 | int err = 0; |
b1c79e09 | 2107 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2108 | |
79787eaa JM |
2109 | if (trans->aborted) |
2110 | return 0; | |
2111 | ||
3173a18f JB |
2112 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2113 | metadata = 0; | |
2114 | ||
5d4f98a2 YZ |
2115 | path = btrfs_alloc_path(); |
2116 | if (!path) | |
2117 | return -ENOMEM; | |
2118 | ||
2119 | key.objectid = node->bytenr; | |
5d4f98a2 | 2120 | |
3173a18f | 2121 | if (metadata) { |
3173a18f | 2122 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2123 | key.offset = extent_op->level; |
3173a18f JB |
2124 | } else { |
2125 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2126 | key.offset = node->num_bytes; | |
2127 | } | |
2128 | ||
2129 | again: | |
5d4f98a2 YZ |
2130 | path->reada = 1; |
2131 | path->leave_spinning = 1; | |
2132 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2133 | path, 0, 1); | |
2134 | if (ret < 0) { | |
2135 | err = ret; | |
2136 | goto out; | |
2137 | } | |
2138 | if (ret > 0) { | |
3173a18f JB |
2139 | if (metadata) { |
2140 | btrfs_release_path(path); | |
2141 | metadata = 0; | |
2142 | ||
2143 | key.offset = node->num_bytes; | |
2144 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2145 | goto again; | |
2146 | } | |
5d4f98a2 YZ |
2147 | err = -EIO; |
2148 | goto out; | |
2149 | } | |
2150 | ||
2151 | leaf = path->nodes[0]; | |
2152 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2153 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2154 | if (item_size < sizeof(*ei)) { | |
2155 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2156 | path, (u64)-1, 0); | |
2157 | if (ret < 0) { | |
2158 | err = ret; | |
2159 | goto out; | |
2160 | } | |
2161 | leaf = path->nodes[0]; | |
2162 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2163 | } | |
2164 | #endif | |
2165 | BUG_ON(item_size < sizeof(*ei)); | |
2166 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2167 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2168 | |
5d4f98a2 YZ |
2169 | btrfs_mark_buffer_dirty(leaf); |
2170 | out: | |
2171 | btrfs_free_path(path); | |
2172 | return err; | |
56bec294 CM |
2173 | } |
2174 | ||
5d4f98a2 YZ |
2175 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2176 | struct btrfs_root *root, | |
2177 | struct btrfs_delayed_ref_node *node, | |
2178 | struct btrfs_delayed_extent_op *extent_op, | |
2179 | int insert_reserved) | |
56bec294 CM |
2180 | { |
2181 | int ret = 0; | |
5d4f98a2 YZ |
2182 | struct btrfs_delayed_tree_ref *ref; |
2183 | struct btrfs_key ins; | |
2184 | u64 parent = 0; | |
2185 | u64 ref_root = 0; | |
3173a18f JB |
2186 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2187 | SKINNY_METADATA); | |
56bec294 | 2188 | |
5d4f98a2 | 2189 | ref = btrfs_delayed_node_to_tree_ref(node); |
599c75ec LB |
2190 | trace_run_delayed_tree_ref(node, ref, node->action); |
2191 | ||
5d4f98a2 YZ |
2192 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2193 | parent = ref->parent; | |
2194 | else | |
2195 | ref_root = ref->root; | |
2196 | ||
3173a18f JB |
2197 | ins.objectid = node->bytenr; |
2198 | if (skinny_metadata) { | |
2199 | ins.offset = ref->level; | |
2200 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2201 | } else { | |
2202 | ins.offset = node->num_bytes; | |
2203 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2204 | } | |
2205 | ||
5d4f98a2 YZ |
2206 | BUG_ON(node->ref_mod != 1); |
2207 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2208 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2209 | ret = alloc_reserved_tree_block(trans, root, |
2210 | parent, ref_root, | |
2211 | extent_op->flags_to_set, | |
2212 | &extent_op->key, | |
2213 | ref->level, &ins); | |
5d4f98a2 YZ |
2214 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2215 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2216 | node->num_bytes, parent, ref_root, | |
2217 | ref->level, 0, 1, extent_op); | |
2218 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2219 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2220 | node->num_bytes, parent, ref_root, | |
2221 | ref->level, 0, 1, extent_op); | |
2222 | } else { | |
2223 | BUG(); | |
2224 | } | |
56bec294 CM |
2225 | return ret; |
2226 | } | |
2227 | ||
2228 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2229 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2230 | struct btrfs_root *root, | |
2231 | struct btrfs_delayed_ref_node *node, | |
2232 | struct btrfs_delayed_extent_op *extent_op, | |
2233 | int insert_reserved) | |
56bec294 | 2234 | { |
79787eaa JM |
2235 | int ret = 0; |
2236 | ||
2237 | if (trans->aborted) | |
2238 | return 0; | |
2239 | ||
5d4f98a2 | 2240 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2241 | struct btrfs_delayed_ref_head *head; |
2242 | /* | |
2243 | * we've hit the end of the chain and we were supposed | |
2244 | * to insert this extent into the tree. But, it got | |
2245 | * deleted before we ever needed to insert it, so all | |
2246 | * we have to do is clean up the accounting | |
2247 | */ | |
5d4f98a2 YZ |
2248 | BUG_ON(extent_op); |
2249 | head = btrfs_delayed_node_to_head(node); | |
599c75ec LB |
2250 | trace_run_delayed_ref_head(node, head, node->action); |
2251 | ||
56bec294 | 2252 | if (insert_reserved) { |
f0486c68 YZ |
2253 | btrfs_pin_extent(root, node->bytenr, |
2254 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2255 | if (head->is_data) { |
2256 | ret = btrfs_del_csums(trans, root, | |
2257 | node->bytenr, | |
2258 | node->num_bytes); | |
5d4f98a2 | 2259 | } |
56bec294 | 2260 | } |
79787eaa | 2261 | return ret; |
56bec294 CM |
2262 | } |
2263 | ||
5d4f98a2 YZ |
2264 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2265 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2266 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2267 | insert_reserved); | |
2268 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2269 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2270 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2271 | insert_reserved); | |
2272 | else | |
2273 | BUG(); | |
2274 | return ret; | |
56bec294 CM |
2275 | } |
2276 | ||
2277 | static noinline struct btrfs_delayed_ref_node * | |
2278 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2279 | { | |
2280 | struct rb_node *node; | |
2281 | struct btrfs_delayed_ref_node *ref; | |
2282 | int action = BTRFS_ADD_DELAYED_REF; | |
2283 | again: | |
2284 | /* | |
2285 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2286 | * this prevents ref count from going down to zero when | |
2287 | * there still are pending delayed ref. | |
2288 | */ | |
2289 | node = rb_prev(&head->node.rb_node); | |
2290 | while (1) { | |
2291 | if (!node) | |
2292 | break; | |
2293 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2294 | rb_node); | |
2295 | if (ref->bytenr != head->node.bytenr) | |
2296 | break; | |
5d4f98a2 | 2297 | if (ref->action == action) |
56bec294 CM |
2298 | return ref; |
2299 | node = rb_prev(node); | |
2300 | } | |
2301 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2302 | action = BTRFS_DROP_DELAYED_REF; | |
2303 | goto again; | |
2304 | } | |
2305 | return NULL; | |
2306 | } | |
2307 | ||
79787eaa JM |
2308 | /* |
2309 | * Returns 0 on success or if called with an already aborted transaction. | |
2310 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2311 | */ | |
c3e69d58 CM |
2312 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2313 | struct btrfs_root *root, | |
2314 | struct list_head *cluster) | |
56bec294 | 2315 | { |
56bec294 CM |
2316 | struct btrfs_delayed_ref_root *delayed_refs; |
2317 | struct btrfs_delayed_ref_node *ref; | |
2318 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2319 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2320 | struct btrfs_fs_info *fs_info = root->fs_info; |
56bec294 | 2321 | int ret; |
c3e69d58 | 2322 | int count = 0; |
56bec294 | 2323 | int must_insert_reserved = 0; |
56bec294 CM |
2324 | |
2325 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2326 | while (1) { |
2327 | if (!locked_ref) { | |
c3e69d58 CM |
2328 | /* pick a new head ref from the cluster list */ |
2329 | if (list_empty(cluster)) | |
56bec294 | 2330 | break; |
56bec294 | 2331 | |
c3e69d58 CM |
2332 | locked_ref = list_entry(cluster->next, |
2333 | struct btrfs_delayed_ref_head, cluster); | |
2334 | ||
2335 | /* grab the lock that says we are going to process | |
2336 | * all the refs for this head */ | |
2337 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2338 | ||
2339 | /* | |
2340 | * we may have dropped the spin lock to get the head | |
2341 | * mutex lock, and that might have given someone else | |
2342 | * time to free the head. If that's true, it has been | |
2343 | * removed from our list and we can move on. | |
2344 | */ | |
2345 | if (ret == -EAGAIN) { | |
2346 | locked_ref = NULL; | |
2347 | count++; | |
2348 | continue; | |
56bec294 CM |
2349 | } |
2350 | } | |
a28ec197 | 2351 | |
ae1e206b JB |
2352 | /* |
2353 | * We need to try and merge add/drops of the same ref since we | |
2354 | * can run into issues with relocate dropping the implicit ref | |
2355 | * and then it being added back again before the drop can | |
2356 | * finish. If we merged anything we need to re-loop so we can | |
2357 | * get a good ref. | |
2358 | */ | |
2359 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, | |
2360 | locked_ref); | |
2361 | ||
d1270cd9 AJ |
2362 | /* |
2363 | * locked_ref is the head node, so we have to go one | |
2364 | * node back for any delayed ref updates | |
2365 | */ | |
2366 | ref = select_delayed_ref(locked_ref); | |
2367 | ||
2368 | if (ref && ref->seq && | |
097b8a7c | 2369 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d1270cd9 AJ |
2370 | /* |
2371 | * there are still refs with lower seq numbers in the | |
2372 | * process of being added. Don't run this ref yet. | |
2373 | */ | |
2374 | list_del_init(&locked_ref->cluster); | |
093486c4 | 2375 | btrfs_delayed_ref_unlock(locked_ref); |
d1270cd9 AJ |
2376 | locked_ref = NULL; |
2377 | delayed_refs->num_heads_ready++; | |
2378 | spin_unlock(&delayed_refs->lock); | |
2379 | cond_resched(); | |
2380 | spin_lock(&delayed_refs->lock); | |
2381 | continue; | |
2382 | } | |
2383 | ||
56bec294 CM |
2384 | /* |
2385 | * record the must insert reserved flag before we | |
2386 | * drop the spin lock. | |
2387 | */ | |
2388 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2389 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2390 | |
5d4f98a2 YZ |
2391 | extent_op = locked_ref->extent_op; |
2392 | locked_ref->extent_op = NULL; | |
2393 | ||
56bec294 CM |
2394 | if (!ref) { |
2395 | /* All delayed refs have been processed, Go ahead | |
2396 | * and send the head node to run_one_delayed_ref, | |
2397 | * so that any accounting fixes can happen | |
2398 | */ | |
2399 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2400 | |
2401 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2402 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2403 | extent_op = NULL; |
2404 | } | |
2405 | ||
2406 | if (extent_op) { | |
2407 | spin_unlock(&delayed_refs->lock); | |
2408 | ||
2409 | ret = run_delayed_extent_op(trans, root, | |
2410 | ref, extent_op); | |
78a6184a | 2411 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2412 | |
79787eaa | 2413 | if (ret) { |
c2cf52eb | 2414 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
253beebd | 2415 | spin_lock(&delayed_refs->lock); |
093486c4 | 2416 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2417 | return ret; |
2418 | } | |
2419 | ||
203bf287 | 2420 | goto next; |
5d4f98a2 | 2421 | } |
56bec294 | 2422 | } |
02217ed2 | 2423 | |
56bec294 CM |
2424 | ref->in_tree = 0; |
2425 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2426 | delayed_refs->num_entries--; | |
093486c4 | 2427 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2428 | /* |
2429 | * when we play the delayed ref, also correct the | |
2430 | * ref_mod on head | |
2431 | */ | |
2432 | switch (ref->action) { | |
2433 | case BTRFS_ADD_DELAYED_REF: | |
2434 | case BTRFS_ADD_DELAYED_EXTENT: | |
2435 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2436 | break; | |
2437 | case BTRFS_DROP_DELAYED_REF: | |
2438 | locked_ref->node.ref_mod += ref->ref_mod; | |
2439 | break; | |
2440 | default: | |
2441 | WARN_ON(1); | |
2442 | } | |
2443 | } | |
56bec294 | 2444 | spin_unlock(&delayed_refs->lock); |
925baedd | 2445 | |
5d4f98a2 | 2446 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2447 | must_insert_reserved); |
eb099670 | 2448 | |
78a6184a | 2449 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2450 | if (ret) { |
093486c4 MX |
2451 | btrfs_delayed_ref_unlock(locked_ref); |
2452 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2453 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
253beebd | 2454 | spin_lock(&delayed_refs->lock); |
79787eaa JM |
2455 | return ret; |
2456 | } | |
2457 | ||
093486c4 MX |
2458 | /* |
2459 | * If this node is a head, that means all the refs in this head | |
2460 | * have been dealt with, and we will pick the next head to deal | |
2461 | * with, so we must unlock the head and drop it from the cluster | |
2462 | * list before we release it. | |
2463 | */ | |
2464 | if (btrfs_delayed_ref_is_head(ref)) { | |
2465 | list_del_init(&locked_ref->cluster); | |
2466 | btrfs_delayed_ref_unlock(locked_ref); | |
2467 | locked_ref = NULL; | |
2468 | } | |
2469 | btrfs_put_delayed_ref(ref); | |
2470 | count++; | |
203bf287 | 2471 | next: |
c3e69d58 CM |
2472 | cond_resched(); |
2473 | spin_lock(&delayed_refs->lock); | |
2474 | } | |
2475 | return count; | |
2476 | } | |
2477 | ||
709c0486 AJ |
2478 | #ifdef SCRAMBLE_DELAYED_REFS |
2479 | /* | |
2480 | * Normally delayed refs get processed in ascending bytenr order. This | |
2481 | * correlates in most cases to the order added. To expose dependencies on this | |
2482 | * order, we start to process the tree in the middle instead of the beginning | |
2483 | */ | |
2484 | static u64 find_middle(struct rb_root *root) | |
2485 | { | |
2486 | struct rb_node *n = root->rb_node; | |
2487 | struct btrfs_delayed_ref_node *entry; | |
2488 | int alt = 1; | |
2489 | u64 middle; | |
2490 | u64 first = 0, last = 0; | |
2491 | ||
2492 | n = rb_first(root); | |
2493 | if (n) { | |
2494 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2495 | first = entry->bytenr; | |
2496 | } | |
2497 | n = rb_last(root); | |
2498 | if (n) { | |
2499 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2500 | last = entry->bytenr; | |
2501 | } | |
2502 | n = root->rb_node; | |
2503 | ||
2504 | while (n) { | |
2505 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2506 | WARN_ON(!entry->in_tree); | |
2507 | ||
2508 | middle = entry->bytenr; | |
2509 | ||
2510 | if (alt) | |
2511 | n = n->rb_left; | |
2512 | else | |
2513 | n = n->rb_right; | |
2514 | ||
2515 | alt = 1 - alt; | |
2516 | } | |
2517 | return middle; | |
2518 | } | |
2519 | #endif | |
2520 | ||
bed92eae AJ |
2521 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2522 | struct btrfs_fs_info *fs_info) | |
2523 | { | |
2524 | struct qgroup_update *qgroup_update; | |
2525 | int ret = 0; | |
2526 | ||
2527 | if (list_empty(&trans->qgroup_ref_list) != | |
2528 | !trans->delayed_ref_elem.seq) { | |
2529 | /* list without seq or seq without list */ | |
c2cf52eb | 2530 | btrfs_err(fs_info, |
fc36ed7e | 2531 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
bed92eae | 2532 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2533 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2534 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2535 | BUG(); |
2536 | } | |
2537 | ||
2538 | if (!trans->delayed_ref_elem.seq) | |
2539 | return 0; | |
2540 | ||
2541 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2542 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2543 | struct qgroup_update, list); | |
2544 | list_del(&qgroup_update->list); | |
2545 | if (!ret) | |
2546 | ret = btrfs_qgroup_account_ref( | |
2547 | trans, fs_info, qgroup_update->node, | |
2548 | qgroup_update->extent_op); | |
2549 | kfree(qgroup_update); | |
2550 | } | |
2551 | ||
2552 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2553 | ||
2554 | return ret; | |
2555 | } | |
2556 | ||
bb721703 CM |
2557 | static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq, |
2558 | int count) | |
2559 | { | |
2560 | int val = atomic_read(&delayed_refs->ref_seq); | |
2561 | ||
2562 | if (val < seq || val >= seq + count) | |
2563 | return 1; | |
2564 | return 0; | |
2565 | } | |
2566 | ||
1be41b78 JB |
2567 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
2568 | { | |
2569 | u64 num_bytes; | |
2570 | ||
2571 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2572 | sizeof(struct btrfs_extent_inline_ref)); | |
2573 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2574 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2575 | ||
2576 | /* | |
2577 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2578 | * closer to what we're really going to want to ouse. | |
2579 | */ | |
2580 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); | |
2581 | } | |
2582 | ||
2583 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, | |
2584 | struct btrfs_root *root) | |
2585 | { | |
2586 | struct btrfs_block_rsv *global_rsv; | |
2587 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
2588 | u64 num_bytes; | |
2589 | int ret = 0; | |
2590 | ||
2591 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2592 | num_heads = heads_to_leaves(root, num_heads); | |
2593 | if (num_heads > 1) | |
2594 | num_bytes += (num_heads - 1) * root->leafsize; | |
2595 | num_bytes <<= 1; | |
2596 | global_rsv = &root->fs_info->global_block_rsv; | |
2597 | ||
2598 | /* | |
2599 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2600 | * wiggle room since running delayed refs can create more delayed refs. | |
2601 | */ | |
2602 | if (global_rsv->space_info->full) | |
2603 | num_bytes <<= 1; | |
2604 | ||
2605 | spin_lock(&global_rsv->lock); | |
2606 | if (global_rsv->reserved <= num_bytes) | |
2607 | ret = 1; | |
2608 | spin_unlock(&global_rsv->lock); | |
2609 | return ret; | |
2610 | } | |
2611 | ||
c3e69d58 CM |
2612 | /* |
2613 | * this starts processing the delayed reference count updates and | |
2614 | * extent insertions we have queued up so far. count can be | |
2615 | * 0, which means to process everything in the tree at the start | |
2616 | * of the run (but not newly added entries), or it can be some target | |
2617 | * number you'd like to process. | |
79787eaa JM |
2618 | * |
2619 | * Returns 0 on success or if called with an aborted transaction | |
2620 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2621 | */ |
2622 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2623 | struct btrfs_root *root, unsigned long count) | |
2624 | { | |
2625 | struct rb_node *node; | |
2626 | struct btrfs_delayed_ref_root *delayed_refs; | |
2627 | struct btrfs_delayed_ref_node *ref; | |
2628 | struct list_head cluster; | |
2629 | int ret; | |
a168650c | 2630 | u64 delayed_start; |
c3e69d58 CM |
2631 | int run_all = count == (unsigned long)-1; |
2632 | int run_most = 0; | |
1fa11e26 | 2633 | int loops; |
c3e69d58 | 2634 | |
79787eaa JM |
2635 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2636 | if (trans->aborted) | |
2637 | return 0; | |
2638 | ||
c3e69d58 CM |
2639 | if (root == root->fs_info->extent_root) |
2640 | root = root->fs_info->tree_root; | |
2641 | ||
edf39272 JS |
2642 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2643 | ||
c3e69d58 CM |
2644 | delayed_refs = &trans->transaction->delayed_refs; |
2645 | INIT_LIST_HEAD(&cluster); | |
bb721703 CM |
2646 | if (count == 0) { |
2647 | count = delayed_refs->num_entries * 2; | |
2648 | run_most = 1; | |
2649 | } | |
2650 | ||
2651 | if (!run_all && !run_most) { | |
2652 | int old; | |
2653 | int seq = atomic_read(&delayed_refs->ref_seq); | |
2654 | ||
2655 | progress: | |
2656 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2657 | if (old) { | |
2658 | DEFINE_WAIT(__wait); | |
1be41b78 JB |
2659 | if (delayed_refs->flushing || |
2660 | !btrfs_should_throttle_delayed_refs(trans, root)) | |
bb721703 CM |
2661 | return 0; |
2662 | ||
2663 | prepare_to_wait(&delayed_refs->wait, &__wait, | |
2664 | TASK_UNINTERRUPTIBLE); | |
2665 | ||
2666 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2667 | if (old) { | |
2668 | schedule(); | |
2669 | finish_wait(&delayed_refs->wait, &__wait); | |
2670 | ||
2671 | if (!refs_newer(delayed_refs, seq, 256)) | |
2672 | goto progress; | |
2673 | else | |
2674 | return 0; | |
2675 | } else { | |
2676 | finish_wait(&delayed_refs->wait, &__wait); | |
2677 | goto again; | |
2678 | } | |
2679 | } | |
2680 | ||
2681 | } else { | |
2682 | atomic_inc(&delayed_refs->procs_running_refs); | |
2683 | } | |
2684 | ||
c3e69d58 | 2685 | again: |
1fa11e26 | 2686 | loops = 0; |
c3e69d58 | 2687 | spin_lock(&delayed_refs->lock); |
097b8a7c | 2688 | |
709c0486 AJ |
2689 | #ifdef SCRAMBLE_DELAYED_REFS |
2690 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2691 | #endif | |
2692 | ||
c3e69d58 CM |
2693 | while (1) { |
2694 | if (!(run_all || run_most) && | |
1be41b78 | 2695 | !btrfs_should_throttle_delayed_refs(trans, root)) |
c3e69d58 | 2696 | break; |
eb099670 | 2697 | |
56bec294 | 2698 | /* |
c3e69d58 CM |
2699 | * go find something we can process in the rbtree. We start at |
2700 | * the beginning of the tree, and then build a cluster | |
2701 | * of refs to process starting at the first one we are able to | |
2702 | * lock | |
56bec294 | 2703 | */ |
a168650c | 2704 | delayed_start = delayed_refs->run_delayed_start; |
c3e69d58 CM |
2705 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2706 | delayed_refs->run_delayed_start); | |
2707 | if (ret) | |
56bec294 CM |
2708 | break; |
2709 | ||
c3e69d58 | 2710 | ret = run_clustered_refs(trans, root, &cluster); |
79787eaa | 2711 | if (ret < 0) { |
093486c4 | 2712 | btrfs_release_ref_cluster(&cluster); |
79787eaa JM |
2713 | spin_unlock(&delayed_refs->lock); |
2714 | btrfs_abort_transaction(trans, root, ret); | |
bb721703 | 2715 | atomic_dec(&delayed_refs->procs_running_refs); |
f971fe29 | 2716 | wake_up(&delayed_refs->wait); |
79787eaa JM |
2717 | return ret; |
2718 | } | |
c3e69d58 | 2719 | |
bb721703 CM |
2720 | atomic_add(ret, &delayed_refs->ref_seq); |
2721 | ||
c3e69d58 CM |
2722 | count -= min_t(unsigned long, ret, count); |
2723 | ||
2724 | if (count == 0) | |
2725 | break; | |
a168650c | 2726 | |
1fa11e26 AJ |
2727 | if (delayed_start >= delayed_refs->run_delayed_start) { |
2728 | if (loops == 0) { | |
2729 | /* | |
2730 | * btrfs_find_ref_cluster looped. let's do one | |
2731 | * more cycle. if we don't run any delayed ref | |
2732 | * during that cycle (because we can't because | |
2733 | * all of them are blocked), bail out. | |
2734 | */ | |
2735 | loops = 1; | |
2736 | } else { | |
2737 | /* | |
2738 | * no runnable refs left, stop trying | |
2739 | */ | |
2740 | BUG_ON(run_all); | |
2741 | break; | |
2742 | } | |
2743 | } | |
2744 | if (ret) { | |
a168650c | 2745 | /* refs were run, let's reset staleness detection */ |
1fa11e26 | 2746 | loops = 0; |
a168650c | 2747 | } |
eb099670 | 2748 | } |
c3e69d58 | 2749 | |
56bec294 | 2750 | if (run_all) { |
ea658bad JB |
2751 | if (!list_empty(&trans->new_bgs)) { |
2752 | spin_unlock(&delayed_refs->lock); | |
2753 | btrfs_create_pending_block_groups(trans, root); | |
2754 | spin_lock(&delayed_refs->lock); | |
2755 | } | |
2756 | ||
56bec294 | 2757 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2758 | if (!node) |
56bec294 | 2759 | goto out; |
c3e69d58 | 2760 | count = (unsigned long)-1; |
e9d0b13b | 2761 | |
56bec294 CM |
2762 | while (node) { |
2763 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2764 | rb_node); | |
2765 | if (btrfs_delayed_ref_is_head(ref)) { | |
2766 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2767 | |
56bec294 CM |
2768 | head = btrfs_delayed_node_to_head(ref); |
2769 | atomic_inc(&ref->refs); | |
2770 | ||
2771 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2772 | /* |
2773 | * Mutex was contended, block until it's | |
2774 | * released and try again | |
2775 | */ | |
56bec294 CM |
2776 | mutex_lock(&head->mutex); |
2777 | mutex_unlock(&head->mutex); | |
2778 | ||
2779 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2780 | cond_resched(); |
56bec294 CM |
2781 | goto again; |
2782 | } | |
2783 | node = rb_next(node); | |
2784 | } | |
2785 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2786 | schedule_timeout(1); |
2787 | goto again; | |
5f39d397 | 2788 | } |
54aa1f4d | 2789 | out: |
bb721703 CM |
2790 | atomic_dec(&delayed_refs->procs_running_refs); |
2791 | smp_mb(); | |
2792 | if (waitqueue_active(&delayed_refs->wait)) | |
2793 | wake_up(&delayed_refs->wait); | |
2794 | ||
c3e69d58 | 2795 | spin_unlock(&delayed_refs->lock); |
edf39272 | 2796 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2797 | return 0; |
2798 | } | |
2799 | ||
5d4f98a2 YZ |
2800 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2801 | struct btrfs_root *root, | |
2802 | u64 bytenr, u64 num_bytes, u64 flags, | |
b1c79e09 | 2803 | int level, int is_data) |
5d4f98a2 YZ |
2804 | { |
2805 | struct btrfs_delayed_extent_op *extent_op; | |
2806 | int ret; | |
2807 | ||
78a6184a | 2808 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2809 | if (!extent_op) |
2810 | return -ENOMEM; | |
2811 | ||
2812 | extent_op->flags_to_set = flags; | |
2813 | extent_op->update_flags = 1; | |
2814 | extent_op->update_key = 0; | |
2815 | extent_op->is_data = is_data ? 1 : 0; | |
b1c79e09 | 2816 | extent_op->level = level; |
5d4f98a2 | 2817 | |
66d7e7f0 AJ |
2818 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2819 | num_bytes, extent_op); | |
5d4f98a2 | 2820 | if (ret) |
78a6184a | 2821 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2822 | return ret; |
2823 | } | |
2824 | ||
2825 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2826 | struct btrfs_root *root, | |
2827 | struct btrfs_path *path, | |
2828 | u64 objectid, u64 offset, u64 bytenr) | |
2829 | { | |
2830 | struct btrfs_delayed_ref_head *head; | |
2831 | struct btrfs_delayed_ref_node *ref; | |
2832 | struct btrfs_delayed_data_ref *data_ref; | |
2833 | struct btrfs_delayed_ref_root *delayed_refs; | |
2834 | struct rb_node *node; | |
2835 | int ret = 0; | |
2836 | ||
2837 | ret = -ENOENT; | |
2838 | delayed_refs = &trans->transaction->delayed_refs; | |
2839 | spin_lock(&delayed_refs->lock); | |
2840 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2841 | if (!head) | |
2842 | goto out; | |
2843 | ||
2844 | if (!mutex_trylock(&head->mutex)) { | |
2845 | atomic_inc(&head->node.refs); | |
2846 | spin_unlock(&delayed_refs->lock); | |
2847 | ||
b3b4aa74 | 2848 | btrfs_release_path(path); |
5d4f98a2 | 2849 | |
8cc33e5c DS |
2850 | /* |
2851 | * Mutex was contended, block until it's released and let | |
2852 | * caller try again | |
2853 | */ | |
5d4f98a2 YZ |
2854 | mutex_lock(&head->mutex); |
2855 | mutex_unlock(&head->mutex); | |
2856 | btrfs_put_delayed_ref(&head->node); | |
2857 | return -EAGAIN; | |
2858 | } | |
2859 | ||
2860 | node = rb_prev(&head->node.rb_node); | |
2861 | if (!node) | |
2862 | goto out_unlock; | |
2863 | ||
2864 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2865 | ||
2866 | if (ref->bytenr != bytenr) | |
2867 | goto out_unlock; | |
2868 | ||
2869 | ret = 1; | |
2870 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2871 | goto out_unlock; | |
2872 | ||
2873 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2874 | ||
2875 | node = rb_prev(node); | |
2876 | if (node) { | |
df57dbe6 LB |
2877 | int seq = ref->seq; |
2878 | ||
5d4f98a2 | 2879 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
df57dbe6 | 2880 | if (ref->bytenr == bytenr && ref->seq == seq) |
5d4f98a2 YZ |
2881 | goto out_unlock; |
2882 | } | |
2883 | ||
2884 | if (data_ref->root != root->root_key.objectid || | |
2885 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2886 | goto out_unlock; | |
2887 | ||
2888 | ret = 0; | |
2889 | out_unlock: | |
2890 | mutex_unlock(&head->mutex); | |
2891 | out: | |
2892 | spin_unlock(&delayed_refs->lock); | |
2893 | return ret; | |
2894 | } | |
2895 | ||
2896 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2897 | struct btrfs_root *root, | |
2898 | struct btrfs_path *path, | |
2899 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2900 | { |
2901 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2902 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2903 | struct btrfs_extent_data_ref *ref; |
2904 | struct btrfs_extent_inline_ref *iref; | |
2905 | struct btrfs_extent_item *ei; | |
f321e491 | 2906 | struct btrfs_key key; |
5d4f98a2 | 2907 | u32 item_size; |
be20aa9d | 2908 | int ret; |
925baedd | 2909 | |
be20aa9d | 2910 | key.objectid = bytenr; |
31840ae1 | 2911 | key.offset = (u64)-1; |
f321e491 | 2912 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2913 | |
be20aa9d CM |
2914 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2915 | if (ret < 0) | |
2916 | goto out; | |
79787eaa | 2917 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2918 | |
2919 | ret = -ENOENT; | |
2920 | if (path->slots[0] == 0) | |
31840ae1 | 2921 | goto out; |
be20aa9d | 2922 | |
31840ae1 | 2923 | path->slots[0]--; |
f321e491 | 2924 | leaf = path->nodes[0]; |
5d4f98a2 | 2925 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2926 | |
5d4f98a2 | 2927 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2928 | goto out; |
f321e491 | 2929 | |
5d4f98a2 YZ |
2930 | ret = 1; |
2931 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2932 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2933 | if (item_size < sizeof(*ei)) { | |
2934 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2935 | goto out; | |
2936 | } | |
2937 | #endif | |
2938 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2939 | |
5d4f98a2 YZ |
2940 | if (item_size != sizeof(*ei) + |
2941 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2942 | goto out; | |
be20aa9d | 2943 | |
5d4f98a2 YZ |
2944 | if (btrfs_extent_generation(leaf, ei) <= |
2945 | btrfs_root_last_snapshot(&root->root_item)) | |
2946 | goto out; | |
2947 | ||
2948 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2949 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2950 | BTRFS_EXTENT_DATA_REF_KEY) | |
2951 | goto out; | |
2952 | ||
2953 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2954 | if (btrfs_extent_refs(leaf, ei) != | |
2955 | btrfs_extent_data_ref_count(leaf, ref) || | |
2956 | btrfs_extent_data_ref_root(leaf, ref) != | |
2957 | root->root_key.objectid || | |
2958 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2959 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2960 | goto out; | |
2961 | ||
2962 | ret = 0; | |
2963 | out: | |
2964 | return ret; | |
2965 | } | |
2966 | ||
2967 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2968 | struct btrfs_root *root, | |
2969 | u64 objectid, u64 offset, u64 bytenr) | |
2970 | { | |
2971 | struct btrfs_path *path; | |
2972 | int ret; | |
2973 | int ret2; | |
2974 | ||
2975 | path = btrfs_alloc_path(); | |
2976 | if (!path) | |
2977 | return -ENOENT; | |
2978 | ||
2979 | do { | |
2980 | ret = check_committed_ref(trans, root, path, objectid, | |
2981 | offset, bytenr); | |
2982 | if (ret && ret != -ENOENT) | |
f321e491 | 2983 | goto out; |
80ff3856 | 2984 | |
5d4f98a2 YZ |
2985 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2986 | offset, bytenr); | |
2987 | } while (ret2 == -EAGAIN); | |
2988 | ||
2989 | if (ret2 && ret2 != -ENOENT) { | |
2990 | ret = ret2; | |
2991 | goto out; | |
f321e491 | 2992 | } |
5d4f98a2 YZ |
2993 | |
2994 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2995 | ret = 0; | |
be20aa9d | 2996 | out: |
80ff3856 | 2997 | btrfs_free_path(path); |
f0486c68 YZ |
2998 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2999 | WARN_ON(ret > 0); | |
f321e491 | 3000 | return ret; |
be20aa9d | 3001 | } |
c5739bba | 3002 | |
5d4f98a2 | 3003 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 3004 | struct btrfs_root *root, |
5d4f98a2 | 3005 | struct extent_buffer *buf, |
66d7e7f0 | 3006 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
3007 | { |
3008 | u64 bytenr; | |
5d4f98a2 YZ |
3009 | u64 num_bytes; |
3010 | u64 parent; | |
31840ae1 | 3011 | u64 ref_root; |
31840ae1 | 3012 | u32 nritems; |
31840ae1 ZY |
3013 | struct btrfs_key key; |
3014 | struct btrfs_file_extent_item *fi; | |
3015 | int i; | |
3016 | int level; | |
3017 | int ret = 0; | |
31840ae1 | 3018 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 3019 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
3020 | |
3021 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
3022 | nritems = btrfs_header_nritems(buf); |
3023 | level = btrfs_header_level(buf); | |
3024 | ||
5d4f98a2 YZ |
3025 | if (!root->ref_cows && level == 0) |
3026 | return 0; | |
31840ae1 | 3027 | |
5d4f98a2 YZ |
3028 | if (inc) |
3029 | process_func = btrfs_inc_extent_ref; | |
3030 | else | |
3031 | process_func = btrfs_free_extent; | |
31840ae1 | 3032 | |
5d4f98a2 YZ |
3033 | if (full_backref) |
3034 | parent = buf->start; | |
3035 | else | |
3036 | parent = 0; | |
3037 | ||
3038 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3039 | if (level == 0) { |
5d4f98a2 | 3040 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
3041 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
3042 | continue; | |
5d4f98a2 | 3043 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3044 | struct btrfs_file_extent_item); |
3045 | if (btrfs_file_extent_type(buf, fi) == | |
3046 | BTRFS_FILE_EXTENT_INLINE) | |
3047 | continue; | |
3048 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3049 | if (bytenr == 0) | |
3050 | continue; | |
5d4f98a2 YZ |
3051 | |
3052 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3053 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3054 | ret = process_func(trans, root, bytenr, num_bytes, | |
3055 | parent, ref_root, key.objectid, | |
66d7e7f0 | 3056 | key.offset, for_cow); |
31840ae1 ZY |
3057 | if (ret) |
3058 | goto fail; | |
3059 | } else { | |
5d4f98a2 YZ |
3060 | bytenr = btrfs_node_blockptr(buf, i); |
3061 | num_bytes = btrfs_level_size(root, level - 1); | |
3062 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
3063 | parent, ref_root, level - 1, 0, |
3064 | for_cow); | |
31840ae1 ZY |
3065 | if (ret) |
3066 | goto fail; | |
3067 | } | |
3068 | } | |
3069 | return 0; | |
3070 | fail: | |
5d4f98a2 YZ |
3071 | return ret; |
3072 | } | |
3073 | ||
3074 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3075 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3076 | { |
66d7e7f0 | 3077 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
3078 | } |
3079 | ||
3080 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3081 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3082 | { |
66d7e7f0 | 3083 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
3084 | } |
3085 | ||
9078a3e1 CM |
3086 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3087 | struct btrfs_root *root, | |
3088 | struct btrfs_path *path, | |
3089 | struct btrfs_block_group_cache *cache) | |
3090 | { | |
3091 | int ret; | |
9078a3e1 | 3092 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3093 | unsigned long bi; |
3094 | struct extent_buffer *leaf; | |
9078a3e1 | 3095 | |
9078a3e1 | 3096 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
3097 | if (ret < 0) |
3098 | goto fail; | |
79787eaa | 3099 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
3100 | |
3101 | leaf = path->nodes[0]; | |
3102 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3103 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3104 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3105 | btrfs_release_path(path); |
54aa1f4d | 3106 | fail: |
79787eaa JM |
3107 | if (ret) { |
3108 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 3109 | return ret; |
79787eaa | 3110 | } |
9078a3e1 CM |
3111 | return 0; |
3112 | ||
3113 | } | |
3114 | ||
4a8c9a62 YZ |
3115 | static struct btrfs_block_group_cache * |
3116 | next_block_group(struct btrfs_root *root, | |
3117 | struct btrfs_block_group_cache *cache) | |
3118 | { | |
3119 | struct rb_node *node; | |
3120 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3121 | node = rb_next(&cache->cache_node); | |
3122 | btrfs_put_block_group(cache); | |
3123 | if (node) { | |
3124 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3125 | cache_node); | |
11dfe35a | 3126 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3127 | } else |
3128 | cache = NULL; | |
3129 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3130 | return cache; | |
3131 | } | |
3132 | ||
0af3d00b JB |
3133 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3134 | struct btrfs_trans_handle *trans, | |
3135 | struct btrfs_path *path) | |
3136 | { | |
3137 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3138 | struct inode *inode = NULL; | |
3139 | u64 alloc_hint = 0; | |
2b20982e | 3140 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
3141 | int num_pages = 0; |
3142 | int retries = 0; | |
3143 | int ret = 0; | |
3144 | ||
3145 | /* | |
3146 | * If this block group is smaller than 100 megs don't bother caching the | |
3147 | * block group. | |
3148 | */ | |
3149 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3150 | spin_lock(&block_group->lock); | |
3151 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3152 | spin_unlock(&block_group->lock); | |
3153 | return 0; | |
3154 | } | |
3155 | ||
3156 | again: | |
3157 | inode = lookup_free_space_inode(root, block_group, path); | |
3158 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3159 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3160 | btrfs_release_path(path); |
0af3d00b JB |
3161 | goto out; |
3162 | } | |
3163 | ||
3164 | if (IS_ERR(inode)) { | |
3165 | BUG_ON(retries); | |
3166 | retries++; | |
3167 | ||
3168 | if (block_group->ro) | |
3169 | goto out_free; | |
3170 | ||
3171 | ret = create_free_space_inode(root, trans, block_group, path); | |
3172 | if (ret) | |
3173 | goto out_free; | |
3174 | goto again; | |
3175 | } | |
3176 | ||
5b0e95bf JB |
3177 | /* We've already setup this transaction, go ahead and exit */ |
3178 | if (block_group->cache_generation == trans->transid && | |
3179 | i_size_read(inode)) { | |
3180 | dcs = BTRFS_DC_SETUP; | |
3181 | goto out_put; | |
3182 | } | |
3183 | ||
0af3d00b JB |
3184 | /* |
3185 | * We want to set the generation to 0, that way if anything goes wrong | |
3186 | * from here on out we know not to trust this cache when we load up next | |
3187 | * time. | |
3188 | */ | |
3189 | BTRFS_I(inode)->generation = 0; | |
3190 | ret = btrfs_update_inode(trans, root, inode); | |
3191 | WARN_ON(ret); | |
3192 | ||
3193 | if (i_size_read(inode) > 0) { | |
7b61cd92 MX |
3194 | ret = btrfs_check_trunc_cache_free_space(root, |
3195 | &root->fs_info->global_block_rsv); | |
3196 | if (ret) | |
3197 | goto out_put; | |
3198 | ||
0af3d00b JB |
3199 | ret = btrfs_truncate_free_space_cache(root, trans, path, |
3200 | inode); | |
3201 | if (ret) | |
3202 | goto out_put; | |
3203 | } | |
3204 | ||
3205 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3206 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3207 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3208 | /* | |
3209 | * don't bother trying to write stuff out _if_ | |
3210 | * a) we're not cached, | |
3211 | * b) we're with nospace_cache mount option. | |
3212 | */ | |
2b20982e | 3213 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3214 | spin_unlock(&block_group->lock); |
3215 | goto out_put; | |
3216 | } | |
3217 | spin_unlock(&block_group->lock); | |
3218 | ||
6fc823b1 JB |
3219 | /* |
3220 | * Try to preallocate enough space based on how big the block group is. | |
3221 | * Keep in mind this has to include any pinned space which could end up | |
3222 | * taking up quite a bit since it's not folded into the other space | |
3223 | * cache. | |
3224 | */ | |
3225 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3226 | if (!num_pages) |
3227 | num_pages = 1; | |
3228 | ||
0af3d00b JB |
3229 | num_pages *= 16; |
3230 | num_pages *= PAGE_CACHE_SIZE; | |
3231 | ||
3232 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3233 | if (ret) | |
3234 | goto out_put; | |
3235 | ||
3236 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3237 | num_pages, num_pages, | |
3238 | &alloc_hint); | |
2b20982e JB |
3239 | if (!ret) |
3240 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3241 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3242 | |
0af3d00b JB |
3243 | out_put: |
3244 | iput(inode); | |
3245 | out_free: | |
b3b4aa74 | 3246 | btrfs_release_path(path); |
0af3d00b JB |
3247 | out: |
3248 | spin_lock(&block_group->lock); | |
e65cbb94 | 3249 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3250 | block_group->cache_generation = trans->transid; |
2b20982e | 3251 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3252 | spin_unlock(&block_group->lock); |
3253 | ||
3254 | return ret; | |
3255 | } | |
3256 | ||
96b5179d CM |
3257 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3258 | struct btrfs_root *root) | |
9078a3e1 | 3259 | { |
4a8c9a62 | 3260 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3261 | int err = 0; |
9078a3e1 | 3262 | struct btrfs_path *path; |
96b5179d | 3263 | u64 last = 0; |
9078a3e1 CM |
3264 | |
3265 | path = btrfs_alloc_path(); | |
3266 | if (!path) | |
3267 | return -ENOMEM; | |
3268 | ||
0af3d00b JB |
3269 | again: |
3270 | while (1) { | |
3271 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3272 | while (cache) { | |
3273 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3274 | break; | |
3275 | cache = next_block_group(root, cache); | |
3276 | } | |
3277 | if (!cache) { | |
3278 | if (last == 0) | |
3279 | break; | |
3280 | last = 0; | |
3281 | continue; | |
3282 | } | |
3283 | err = cache_save_setup(cache, trans, path); | |
3284 | last = cache->key.objectid + cache->key.offset; | |
3285 | btrfs_put_block_group(cache); | |
3286 | } | |
3287 | ||
d397712b | 3288 | while (1) { |
4a8c9a62 YZ |
3289 | if (last == 0) { |
3290 | err = btrfs_run_delayed_refs(trans, root, | |
3291 | (unsigned long)-1); | |
79787eaa JM |
3292 | if (err) /* File system offline */ |
3293 | goto out; | |
0f9dd46c | 3294 | } |
54aa1f4d | 3295 | |
4a8c9a62 YZ |
3296 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3297 | while (cache) { | |
0af3d00b JB |
3298 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3299 | btrfs_put_block_group(cache); | |
3300 | goto again; | |
3301 | } | |
3302 | ||
4a8c9a62 YZ |
3303 | if (cache->dirty) |
3304 | break; | |
3305 | cache = next_block_group(root, cache); | |
3306 | } | |
3307 | if (!cache) { | |
3308 | if (last == 0) | |
3309 | break; | |
3310 | last = 0; | |
3311 | continue; | |
3312 | } | |
0f9dd46c | 3313 | |
0cb59c99 JB |
3314 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3315 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3316 | cache->dirty = 0; |
4a8c9a62 | 3317 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3318 | |
4a8c9a62 | 3319 | err = write_one_cache_group(trans, root, path, cache); |
79787eaa JM |
3320 | if (err) /* File system offline */ |
3321 | goto out; | |
3322 | ||
4a8c9a62 | 3323 | btrfs_put_block_group(cache); |
9078a3e1 | 3324 | } |
4a8c9a62 | 3325 | |
0cb59c99 JB |
3326 | while (1) { |
3327 | /* | |
3328 | * I don't think this is needed since we're just marking our | |
3329 | * preallocated extent as written, but just in case it can't | |
3330 | * hurt. | |
3331 | */ | |
3332 | if (last == 0) { | |
3333 | err = btrfs_run_delayed_refs(trans, root, | |
3334 | (unsigned long)-1); | |
79787eaa JM |
3335 | if (err) /* File system offline */ |
3336 | goto out; | |
0cb59c99 JB |
3337 | } |
3338 | ||
3339 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3340 | while (cache) { | |
3341 | /* | |
3342 | * Really this shouldn't happen, but it could if we | |
3343 | * couldn't write the entire preallocated extent and | |
3344 | * splitting the extent resulted in a new block. | |
3345 | */ | |
3346 | if (cache->dirty) { | |
3347 | btrfs_put_block_group(cache); | |
3348 | goto again; | |
3349 | } | |
3350 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3351 | break; | |
3352 | cache = next_block_group(root, cache); | |
3353 | } | |
3354 | if (!cache) { | |
3355 | if (last == 0) | |
3356 | break; | |
3357 | last = 0; | |
3358 | continue; | |
3359 | } | |
3360 | ||
79787eaa | 3361 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3362 | |
3363 | /* | |
3364 | * If we didn't have an error then the cache state is still | |
3365 | * NEED_WRITE, so we can set it to WRITTEN. | |
3366 | */ | |
79787eaa | 3367 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3368 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3369 | last = cache->key.objectid + cache->key.offset; | |
3370 | btrfs_put_block_group(cache); | |
3371 | } | |
79787eaa | 3372 | out: |
0cb59c99 | 3373 | |
9078a3e1 | 3374 | btrfs_free_path(path); |
79787eaa | 3375 | return err; |
9078a3e1 CM |
3376 | } |
3377 | ||
d2fb3437 YZ |
3378 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3379 | { | |
3380 | struct btrfs_block_group_cache *block_group; | |
3381 | int readonly = 0; | |
3382 | ||
3383 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3384 | if (!block_group || block_group->ro) | |
3385 | readonly = 1; | |
3386 | if (block_group) | |
fa9c0d79 | 3387 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3388 | return readonly; |
3389 | } | |
3390 | ||
593060d7 CM |
3391 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3392 | u64 total_bytes, u64 bytes_used, | |
3393 | struct btrfs_space_info **space_info) | |
3394 | { | |
3395 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3396 | int i; |
3397 | int factor; | |
b150a4f1 | 3398 | int ret; |
b742bb82 YZ |
3399 | |
3400 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3401 | BTRFS_BLOCK_GROUP_RAID10)) | |
3402 | factor = 2; | |
3403 | else | |
3404 | factor = 1; | |
593060d7 CM |
3405 | |
3406 | found = __find_space_info(info, flags); | |
3407 | if (found) { | |
25179201 | 3408 | spin_lock(&found->lock); |
593060d7 | 3409 | found->total_bytes += total_bytes; |
89a55897 | 3410 | found->disk_total += total_bytes * factor; |
593060d7 | 3411 | found->bytes_used += bytes_used; |
b742bb82 | 3412 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3413 | found->full = 0; |
25179201 | 3414 | spin_unlock(&found->lock); |
593060d7 CM |
3415 | *space_info = found; |
3416 | return 0; | |
3417 | } | |
c146afad | 3418 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3419 | if (!found) |
3420 | return -ENOMEM; | |
3421 | ||
b150a4f1 JB |
3422 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
3423 | if (ret) { | |
3424 | kfree(found); | |
3425 | return ret; | |
3426 | } | |
3427 | ||
b742bb82 YZ |
3428 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3429 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3430 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3431 | spin_lock_init(&found->lock); |
52ba6929 | 3432 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3433 | found->total_bytes = total_bytes; |
89a55897 | 3434 | found->disk_total = total_bytes * factor; |
593060d7 | 3435 | found->bytes_used = bytes_used; |
b742bb82 | 3436 | found->disk_used = bytes_used * factor; |
593060d7 | 3437 | found->bytes_pinned = 0; |
e8569813 | 3438 | found->bytes_reserved = 0; |
c146afad | 3439 | found->bytes_readonly = 0; |
f0486c68 | 3440 | found->bytes_may_use = 0; |
593060d7 | 3441 | found->full = 0; |
0e4f8f88 | 3442 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3443 | found->chunk_alloc = 0; |
fdb5effd JB |
3444 | found->flush = 0; |
3445 | init_waitqueue_head(&found->wait); | |
593060d7 | 3446 | *space_info = found; |
4184ea7f | 3447 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3448 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3449 | info->data_sinfo = found; | |
593060d7 CM |
3450 | return 0; |
3451 | } | |
3452 | ||
8790d502 CM |
3453 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3454 | { | |
899c81ea ID |
3455 | u64 extra_flags = chunk_to_extended(flags) & |
3456 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3457 | |
de98ced9 | 3458 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3459 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3460 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3461 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3462 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3463 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3464 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3465 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3466 | } |
593060d7 | 3467 | |
fc67c450 ID |
3468 | /* |
3469 | * returns target flags in extended format or 0 if restripe for this | |
3470 | * chunk_type is not in progress | |
c6664b42 ID |
3471 | * |
3472 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3473 | */ |
3474 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3475 | { | |
3476 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3477 | u64 target = 0; | |
3478 | ||
fc67c450 ID |
3479 | if (!bctl) |
3480 | return 0; | |
3481 | ||
3482 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3483 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3484 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3485 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3486 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3487 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3488 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3489 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3490 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3491 | } | |
3492 | ||
3493 | return target; | |
3494 | } | |
3495 | ||
a46d11a8 ID |
3496 | /* |
3497 | * @flags: available profiles in extended format (see ctree.h) | |
3498 | * | |
e4d8ec0f ID |
3499 | * Returns reduced profile in chunk format. If profile changing is in |
3500 | * progress (either running or paused) picks the target profile (if it's | |
3501 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3502 | */ |
48a3b636 | 3503 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3504 | { |
cd02dca5 CM |
3505 | /* |
3506 | * we add in the count of missing devices because we want | |
3507 | * to make sure that any RAID levels on a degraded FS | |
3508 | * continue to be honored. | |
3509 | */ | |
3510 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3511 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3512 | u64 target; |
53b381b3 | 3513 | u64 tmp; |
a061fc8d | 3514 | |
fc67c450 ID |
3515 | /* |
3516 | * see if restripe for this chunk_type is in progress, if so | |
3517 | * try to reduce to the target profile | |
3518 | */ | |
e4d8ec0f | 3519 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3520 | target = get_restripe_target(root->fs_info, flags); |
3521 | if (target) { | |
3522 | /* pick target profile only if it's already available */ | |
3523 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3524 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3525 | return extended_to_chunk(target); |
e4d8ec0f ID |
3526 | } |
3527 | } | |
3528 | spin_unlock(&root->fs_info->balance_lock); | |
3529 | ||
53b381b3 | 3530 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3531 | if (num_devices == 1) |
53b381b3 DW |
3532 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3533 | BTRFS_BLOCK_GROUP_RAID5); | |
3534 | if (num_devices < 3) | |
3535 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3536 | if (num_devices < 4) |
3537 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3538 | ||
53b381b3 DW |
3539 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3540 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3541 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3542 | flags &= ~tmp; | |
ec44a35c | 3543 | |
53b381b3 DW |
3544 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3545 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3546 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3547 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3548 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3549 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3550 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3551 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3552 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3553 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3554 | |
53b381b3 | 3555 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3556 | } |
3557 | ||
b742bb82 | 3558 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3559 | { |
de98ced9 MX |
3560 | unsigned seq; |
3561 | ||
3562 | do { | |
3563 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3564 | ||
3565 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3566 | flags |= root->fs_info->avail_data_alloc_bits; | |
3567 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3568 | flags |= root->fs_info->avail_system_alloc_bits; | |
3569 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3570 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3571 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3572 | |
b742bb82 | 3573 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3574 | } |
3575 | ||
6d07bcec | 3576 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3577 | { |
b742bb82 | 3578 | u64 flags; |
53b381b3 | 3579 | u64 ret; |
9ed74f2d | 3580 | |
b742bb82 YZ |
3581 | if (data) |
3582 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3583 | else if (root == root->fs_info->chunk_root) | |
3584 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3585 | else |
b742bb82 | 3586 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3587 | |
53b381b3 DW |
3588 | ret = get_alloc_profile(root, flags); |
3589 | return ret; | |
6a63209f | 3590 | } |
9ed74f2d | 3591 | |
6a63209f | 3592 | /* |
6a63209f JB |
3593 | * This will check the space that the inode allocates from to make sure we have |
3594 | * enough space for bytes. | |
6a63209f | 3595 | */ |
0ca1f7ce | 3596 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3597 | { |
6a63209f | 3598 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3599 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3600 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3601 | u64 used; |
0af3d00b | 3602 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3603 | |
6a63209f | 3604 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3605 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3606 | |
82d5902d LZ |
3607 | if (root == root->fs_info->tree_root || |
3608 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3609 | alloc_chunk = 0; |
3610 | committed = 1; | |
3611 | } | |
3612 | ||
b4d7c3c9 | 3613 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3614 | if (!data_sinfo) |
3615 | goto alloc; | |
9ed74f2d | 3616 | |
6a63209f JB |
3617 | again: |
3618 | /* make sure we have enough space to handle the data first */ | |
3619 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3620 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3621 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3622 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3623 | |
3624 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3625 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3626 | |
6a63209f JB |
3627 | /* |
3628 | * if we don't have enough free bytes in this space then we need | |
3629 | * to alloc a new chunk. | |
3630 | */ | |
0af3d00b | 3631 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3632 | u64 alloc_target; |
9ed74f2d | 3633 | |
0e4f8f88 | 3634 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3635 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3636 | alloc: |
6a63209f | 3637 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3638 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3639 | if (IS_ERR(trans)) |
3640 | return PTR_ERR(trans); | |
9ed74f2d | 3641 | |
6a63209f | 3642 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3643 | alloc_target, |
3644 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3645 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3646 | if (ret < 0) { |
3647 | if (ret != -ENOSPC) | |
3648 | return ret; | |
3649 | else | |
3650 | goto commit_trans; | |
3651 | } | |
9ed74f2d | 3652 | |
b4d7c3c9 LZ |
3653 | if (!data_sinfo) |
3654 | data_sinfo = fs_info->data_sinfo; | |
3655 | ||
6a63209f JB |
3656 | goto again; |
3657 | } | |
f2bb8f5c JB |
3658 | |
3659 | /* | |
b150a4f1 JB |
3660 | * If we don't have enough pinned space to deal with this |
3661 | * allocation don't bother committing the transaction. | |
f2bb8f5c | 3662 | */ |
b150a4f1 JB |
3663 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
3664 | bytes) < 0) | |
f2bb8f5c | 3665 | committed = 1; |
6a63209f | 3666 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3667 | |
4e06bdd6 | 3668 | /* commit the current transaction and try again */ |
d52a5b5f | 3669 | commit_trans: |
a4abeea4 JB |
3670 | if (!committed && |
3671 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3672 | committed = 1; |
b150a4f1 | 3673 | |
7a7eaa40 | 3674 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3675 | if (IS_ERR(trans)) |
3676 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3677 | ret = btrfs_commit_transaction(trans, root); |
3678 | if (ret) | |
3679 | return ret; | |
3680 | goto again; | |
3681 | } | |
9ed74f2d | 3682 | |
6a63209f JB |
3683 | return -ENOSPC; |
3684 | } | |
3685 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3686 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3687 | data_sinfo->flags, bytes, 1); |
6a63209f | 3688 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3689 | |
9ed74f2d | 3690 | return 0; |
9ed74f2d | 3691 | } |
6a63209f | 3692 | |
6a63209f | 3693 | /* |
fb25e914 | 3694 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3695 | */ |
0ca1f7ce | 3696 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3697 | { |
0ca1f7ce | 3698 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3699 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3700 | |
6a63209f | 3701 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3702 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3703 | |
b4d7c3c9 | 3704 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f | 3705 | spin_lock(&data_sinfo->lock); |
7ee9e440 | 3706 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
6a63209f | 3707 | data_sinfo->bytes_may_use -= bytes; |
8c2a3ca2 | 3708 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3709 | data_sinfo->flags, bytes, 0); |
6a63209f | 3710 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3711 | } |
3712 | ||
97e728d4 | 3713 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3714 | { |
97e728d4 JB |
3715 | struct list_head *head = &info->space_info; |
3716 | struct btrfs_space_info *found; | |
e3ccfa98 | 3717 | |
97e728d4 JB |
3718 | rcu_read_lock(); |
3719 | list_for_each_entry_rcu(found, head, list) { | |
3720 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3721 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3722 | } |
97e728d4 | 3723 | rcu_read_unlock(); |
e3ccfa98 JB |
3724 | } |
3725 | ||
3c76cd84 MX |
3726 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
3727 | { | |
3728 | return (global->size << 1); | |
3729 | } | |
3730 | ||
e5bc2458 | 3731 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3732 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3733 | { |
fb25e914 | 3734 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3735 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3736 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3737 | u64 thresh; |
e3ccfa98 | 3738 | |
0e4f8f88 CM |
3739 | if (force == CHUNK_ALLOC_FORCE) |
3740 | return 1; | |
3741 | ||
fb25e914 JB |
3742 | /* |
3743 | * We need to take into account the global rsv because for all intents | |
3744 | * and purposes it's used space. Don't worry about locking the | |
3745 | * global_rsv, it doesn't change except when the transaction commits. | |
3746 | */ | |
54338b5c | 3747 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 3748 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 3749 | |
0e4f8f88 CM |
3750 | /* |
3751 | * in limited mode, we want to have some free space up to | |
3752 | * about 1% of the FS size. | |
3753 | */ | |
3754 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3755 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3756 | thresh = max_t(u64, 64 * 1024 * 1024, |
3757 | div_factor_fine(thresh, 1)); | |
3758 | ||
3759 | if (num_bytes - num_allocated < thresh) | |
3760 | return 1; | |
3761 | } | |
0e4f8f88 | 3762 | |
698d0082 | 3763 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3764 | return 0; |
424499db | 3765 | return 1; |
32c00aff JB |
3766 | } |
3767 | ||
15d1ff81 LB |
3768 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3769 | { | |
3770 | u64 num_dev; | |
3771 | ||
53b381b3 DW |
3772 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3773 | BTRFS_BLOCK_GROUP_RAID0 | | |
3774 | BTRFS_BLOCK_GROUP_RAID5 | | |
3775 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3776 | num_dev = root->fs_info->fs_devices->rw_devices; |
3777 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3778 | num_dev = 2; | |
3779 | else | |
3780 | num_dev = 1; /* DUP or single */ | |
3781 | ||
3782 | /* metadata for updaing devices and chunk tree */ | |
3783 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3784 | } | |
3785 | ||
3786 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3787 | struct btrfs_root *root, u64 type) | |
3788 | { | |
3789 | struct btrfs_space_info *info; | |
3790 | u64 left; | |
3791 | u64 thresh; | |
3792 | ||
3793 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3794 | spin_lock(&info->lock); | |
3795 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3796 | info->bytes_reserved - info->bytes_readonly; | |
3797 | spin_unlock(&info->lock); | |
3798 | ||
3799 | thresh = get_system_chunk_thresh(root, type); | |
3800 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
c2cf52eb SK |
3801 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
3802 | left, thresh, type); | |
15d1ff81 LB |
3803 | dump_space_info(info, 0, 0); |
3804 | } | |
3805 | ||
3806 | if (left < thresh) { | |
3807 | u64 flags; | |
3808 | ||
3809 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3810 | btrfs_alloc_chunk(trans, root, flags); | |
3811 | } | |
3812 | } | |
3813 | ||
6324fbf3 | 3814 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3815 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3816 | { |
6324fbf3 | 3817 | struct btrfs_space_info *space_info; |
97e728d4 | 3818 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3819 | int wait_for_alloc = 0; |
9ed74f2d | 3820 | int ret = 0; |
9ed74f2d | 3821 | |
c6b305a8 JB |
3822 | /* Don't re-enter if we're already allocating a chunk */ |
3823 | if (trans->allocating_chunk) | |
3824 | return -ENOSPC; | |
3825 | ||
6324fbf3 | 3826 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3827 | if (!space_info) { |
3828 | ret = update_space_info(extent_root->fs_info, flags, | |
3829 | 0, 0, &space_info); | |
79787eaa | 3830 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3831 | } |
79787eaa | 3832 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3833 | |
6d74119f | 3834 | again: |
25179201 | 3835 | spin_lock(&space_info->lock); |
9e622d6b | 3836 | if (force < space_info->force_alloc) |
0e4f8f88 | 3837 | force = space_info->force_alloc; |
25179201 JB |
3838 | if (space_info->full) { |
3839 | spin_unlock(&space_info->lock); | |
6d74119f | 3840 | return 0; |
9ed74f2d JB |
3841 | } |
3842 | ||
698d0082 | 3843 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3844 | spin_unlock(&space_info->lock); |
6d74119f JB |
3845 | return 0; |
3846 | } else if (space_info->chunk_alloc) { | |
3847 | wait_for_alloc = 1; | |
3848 | } else { | |
3849 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3850 | } |
0e4f8f88 | 3851 | |
25179201 | 3852 | spin_unlock(&space_info->lock); |
9ed74f2d | 3853 | |
6d74119f JB |
3854 | mutex_lock(&fs_info->chunk_mutex); |
3855 | ||
3856 | /* | |
3857 | * The chunk_mutex is held throughout the entirety of a chunk | |
3858 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3859 | * other guy is done and we need to recheck and see if we should | |
3860 | * allocate. | |
3861 | */ | |
3862 | if (wait_for_alloc) { | |
3863 | mutex_unlock(&fs_info->chunk_mutex); | |
3864 | wait_for_alloc = 0; | |
3865 | goto again; | |
3866 | } | |
3867 | ||
c6b305a8 JB |
3868 | trans->allocating_chunk = true; |
3869 | ||
67377734 JB |
3870 | /* |
3871 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3872 | * allocating mixed chunks instead of individual chunks. | |
3873 | */ | |
3874 | if (btrfs_mixed_space_info(space_info)) | |
3875 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3876 | ||
97e728d4 JB |
3877 | /* |
3878 | * if we're doing a data chunk, go ahead and make sure that | |
3879 | * we keep a reasonable number of metadata chunks allocated in the | |
3880 | * FS as well. | |
3881 | */ | |
9ed74f2d | 3882 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3883 | fs_info->data_chunk_allocations++; |
3884 | if (!(fs_info->data_chunk_allocations % | |
3885 | fs_info->metadata_ratio)) | |
3886 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3887 | } |
3888 | ||
15d1ff81 LB |
3889 | /* |
3890 | * Check if we have enough space in SYSTEM chunk because we may need | |
3891 | * to update devices. | |
3892 | */ | |
3893 | check_system_chunk(trans, extent_root, flags); | |
3894 | ||
2b82032c | 3895 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3896 | trans->allocating_chunk = false; |
92b8e897 | 3897 | |
9ed74f2d | 3898 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3899 | if (ret < 0 && ret != -ENOSPC) |
3900 | goto out; | |
9ed74f2d | 3901 | if (ret) |
6324fbf3 | 3902 | space_info->full = 1; |
424499db YZ |
3903 | else |
3904 | ret = 1; | |
6d74119f | 3905 | |
0e4f8f88 | 3906 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3907 | out: |
6d74119f | 3908 | space_info->chunk_alloc = 0; |
9ed74f2d | 3909 | spin_unlock(&space_info->lock); |
a25c75d5 | 3910 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3911 | return ret; |
6324fbf3 | 3912 | } |
9ed74f2d | 3913 | |
a80c8dcf JB |
3914 | static int can_overcommit(struct btrfs_root *root, |
3915 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3916 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3917 | { |
96f1bb57 | 3918 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3919 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 3920 | u64 space_size; |
a80c8dcf JB |
3921 | u64 avail; |
3922 | u64 used; | |
70afa399 | 3923 | u64 to_add; |
a80c8dcf JB |
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 | ||
70afa399 JB |
3957 | to_add = space_info->total_bytes; |
3958 | ||
a80c8dcf | 3959 | /* |
561c294d MX |
3960 | * If we aren't flushing all things, let us overcommit up to |
3961 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3962 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3963 | */ |
08e007d2 | 3964 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
70afa399 | 3965 | to_add >>= 3; |
a80c8dcf | 3966 | else |
70afa399 | 3967 | to_add >>= 1; |
a80c8dcf | 3968 | |
70afa399 JB |
3969 | /* |
3970 | * Limit the overcommit to the amount of free space we could possibly | |
3971 | * allocate for chunks. | |
3972 | */ | |
3973 | to_add = min(avail, to_add); | |
a80c8dcf | 3974 | |
70afa399 | 3975 | if (used + bytes < space_info->total_bytes + to_add) |
a80c8dcf JB |
3976 | return 1; |
3977 | return 0; | |
3978 | } | |
3979 | ||
48a3b636 ES |
3980 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3981 | unsigned long nr_pages) | |
da633a42 MX |
3982 | { |
3983 | struct super_block *sb = root->fs_info->sb; | |
da633a42 | 3984 | |
925a6efb JB |
3985 | if (down_read_trylock(&sb->s_umount)) { |
3986 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
3987 | up_read(&sb->s_umount); | |
3988 | } else { | |
da633a42 MX |
3989 | /* |
3990 | * We needn't worry the filesystem going from r/w to r/o though | |
3991 | * we don't acquire ->s_umount mutex, because the filesystem | |
3992 | * should guarantee the delalloc inodes list be empty after | |
3993 | * the filesystem is readonly(all dirty pages are written to | |
3994 | * the disk). | |
3995 | */ | |
eb73c1b7 | 3996 | btrfs_start_all_delalloc_inodes(root->fs_info, 0); |
98ad69cf | 3997 | if (!current->journal_info) |
199c2a9c | 3998 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
da633a42 MX |
3999 | } |
4000 | } | |
4001 | ||
9ed74f2d | 4002 | /* |
5da9d01b | 4003 | * shrink metadata reservation for delalloc |
9ed74f2d | 4004 | */ |
f4c738c2 JB |
4005 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
4006 | bool wait_ordered) | |
5da9d01b | 4007 | { |
0ca1f7ce | 4008 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 4009 | struct btrfs_space_info *space_info; |
663350ac | 4010 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4011 | u64 delalloc_bytes; |
5da9d01b | 4012 | u64 max_reclaim; |
b1953bce | 4013 | long time_left; |
877da174 | 4014 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 4015 | int loops = 0; |
08e007d2 | 4016 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 4017 | |
663350ac | 4018 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 4019 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 4020 | space_info = block_rsv->space_info; |
bf9022e0 CM |
4021 | |
4022 | smp_mb(); | |
963d678b MX |
4023 | delalloc_bytes = percpu_counter_sum_positive( |
4024 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 4025 | if (delalloc_bytes == 0) { |
fdb5effd | 4026 | if (trans) |
f4c738c2 | 4027 | return; |
199c2a9c | 4028 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
f4c738c2 | 4029 | return; |
fdb5effd JB |
4030 | } |
4031 | ||
f4c738c2 JB |
4032 | while (delalloc_bytes && loops < 3) { |
4033 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
4034 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 4035 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
4036 | /* |
4037 | * We need to wait for the async pages to actually start before | |
4038 | * we do anything. | |
4039 | */ | |
4040 | wait_event(root->fs_info->async_submit_wait, | |
4041 | !atomic_read(&root->fs_info->async_delalloc_pages)); | |
4042 | ||
08e007d2 MX |
4043 | if (!trans) |
4044 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4045 | else | |
4046 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 4047 | spin_lock(&space_info->lock); |
08e007d2 | 4048 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4049 | spin_unlock(&space_info->lock); |
4050 | break; | |
4051 | } | |
0019f10d | 4052 | spin_unlock(&space_info->lock); |
5da9d01b | 4053 | |
36e39c40 | 4054 | loops++; |
f104d044 | 4055 | if (wait_ordered && !trans) { |
199c2a9c | 4056 | btrfs_wait_all_ordered_extents(root->fs_info, 0); |
f104d044 | 4057 | } else { |
f4c738c2 | 4058 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4059 | if (time_left) |
4060 | break; | |
4061 | } | |
f4c738c2 | 4062 | smp_mb(); |
963d678b MX |
4063 | delalloc_bytes = percpu_counter_sum_positive( |
4064 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4065 | } |
5da9d01b YZ |
4066 | } |
4067 | ||
663350ac JB |
4068 | /** |
4069 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4070 | * @root - the root we're allocating for | |
4071 | * @bytes - the number of bytes we want to reserve | |
4072 | * @force - force the commit | |
8bb8ab2e | 4073 | * |
663350ac JB |
4074 | * This will check to make sure that committing the transaction will actually |
4075 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4076 | * will return -ENOSPC. | |
8bb8ab2e | 4077 | */ |
663350ac JB |
4078 | static int may_commit_transaction(struct btrfs_root *root, |
4079 | struct btrfs_space_info *space_info, | |
4080 | u64 bytes, int force) | |
4081 | { | |
4082 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4083 | struct btrfs_trans_handle *trans; | |
4084 | ||
4085 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4086 | if (trans) | |
4087 | return -EAGAIN; | |
4088 | ||
4089 | if (force) | |
4090 | goto commit; | |
4091 | ||
4092 | /* See if there is enough pinned space to make this reservation */ | |
4093 | spin_lock(&space_info->lock); | |
b150a4f1 JB |
4094 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4095 | bytes) >= 0) { | |
663350ac JB |
4096 | spin_unlock(&space_info->lock); |
4097 | goto commit; | |
4098 | } | |
4099 | spin_unlock(&space_info->lock); | |
4100 | ||
4101 | /* | |
4102 | * See if there is some space in the delayed insertion reservation for | |
4103 | * this reservation. | |
4104 | */ | |
4105 | if (space_info != delayed_rsv->space_info) | |
4106 | return -ENOSPC; | |
4107 | ||
d9b0218f | 4108 | spin_lock(&space_info->lock); |
663350ac | 4109 | spin_lock(&delayed_rsv->lock); |
b150a4f1 JB |
4110 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4111 | bytes - delayed_rsv->size) >= 0) { | |
663350ac | 4112 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 4113 | spin_unlock(&space_info->lock); |
663350ac JB |
4114 | return -ENOSPC; |
4115 | } | |
4116 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 4117 | spin_unlock(&space_info->lock); |
663350ac JB |
4118 | |
4119 | commit: | |
4120 | trans = btrfs_join_transaction(root); | |
4121 | if (IS_ERR(trans)) | |
4122 | return -ENOSPC; | |
4123 | ||
4124 | return btrfs_commit_transaction(trans, root); | |
4125 | } | |
4126 | ||
96c3f433 | 4127 | enum flush_state { |
67b0fd63 JB |
4128 | FLUSH_DELAYED_ITEMS_NR = 1, |
4129 | FLUSH_DELAYED_ITEMS = 2, | |
4130 | FLUSH_DELALLOC = 3, | |
4131 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4132 | ALLOC_CHUNK = 5, |
4133 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4134 | }; |
4135 | ||
4136 | static int flush_space(struct btrfs_root *root, | |
4137 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4138 | u64 orig_bytes, int state) | |
4139 | { | |
4140 | struct btrfs_trans_handle *trans; | |
4141 | int nr; | |
f4c738c2 | 4142 | int ret = 0; |
96c3f433 JB |
4143 | |
4144 | switch (state) { | |
96c3f433 JB |
4145 | case FLUSH_DELAYED_ITEMS_NR: |
4146 | case FLUSH_DELAYED_ITEMS: | |
4147 | if (state == FLUSH_DELAYED_ITEMS_NR) { | |
4148 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4149 | ||
4150 | nr = (int)div64_u64(num_bytes, bytes); | |
4151 | if (!nr) | |
4152 | nr = 1; | |
4153 | nr *= 2; | |
4154 | } else { | |
4155 | nr = -1; | |
4156 | } | |
4157 | trans = btrfs_join_transaction(root); | |
4158 | if (IS_ERR(trans)) { | |
4159 | ret = PTR_ERR(trans); | |
4160 | break; | |
4161 | } | |
4162 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4163 | btrfs_end_transaction(trans, root); | |
4164 | break; | |
67b0fd63 JB |
4165 | case FLUSH_DELALLOC: |
4166 | case FLUSH_DELALLOC_WAIT: | |
4167 | shrink_delalloc(root, num_bytes, orig_bytes, | |
4168 | state == FLUSH_DELALLOC_WAIT); | |
4169 | break; | |
ea658bad JB |
4170 | case ALLOC_CHUNK: |
4171 | trans = btrfs_join_transaction(root); | |
4172 | if (IS_ERR(trans)) { | |
4173 | ret = PTR_ERR(trans); | |
4174 | break; | |
4175 | } | |
4176 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4177 | btrfs_get_alloc_profile(root, 0), |
4178 | CHUNK_ALLOC_NO_FORCE); | |
4179 | btrfs_end_transaction(trans, root); | |
4180 | if (ret == -ENOSPC) | |
4181 | ret = 0; | |
4182 | break; | |
96c3f433 JB |
4183 | case COMMIT_TRANS: |
4184 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4185 | break; | |
4186 | default: | |
4187 | ret = -ENOSPC; | |
4188 | break; | |
4189 | } | |
4190 | ||
4191 | return ret; | |
4192 | } | |
4a92b1b8 JB |
4193 | /** |
4194 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4195 | * @root - the root we're allocating for | |
4196 | * @block_rsv - the block_rsv we're allocating for | |
4197 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4198 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4199 | * |
4a92b1b8 JB |
4200 | * This will reserve orgi_bytes number of bytes from the space info associated |
4201 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4202 | * flush out space to make room. It will do this by flushing delalloc if | |
4203 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4204 | * regain reservations will be made and this will fail if there is not enough | |
4205 | * space already. | |
8bb8ab2e | 4206 | */ |
4a92b1b8 | 4207 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4208 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4209 | u64 orig_bytes, |
4210 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4211 | { |
f0486c68 | 4212 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4213 | u64 used; |
8bb8ab2e | 4214 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4215 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4216 | int ret = 0; |
fdb5effd | 4217 | bool flushing = false; |
9ed74f2d | 4218 | |
8bb8ab2e | 4219 | again: |
fdb5effd | 4220 | ret = 0; |
8bb8ab2e | 4221 | spin_lock(&space_info->lock); |
fdb5effd | 4222 | /* |
08e007d2 MX |
4223 | * We only want to wait if somebody other than us is flushing and we |
4224 | * are actually allowed to flush all things. | |
fdb5effd | 4225 | */ |
08e007d2 MX |
4226 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4227 | space_info->flush) { | |
fdb5effd JB |
4228 | spin_unlock(&space_info->lock); |
4229 | /* | |
4230 | * If we have a trans handle we can't wait because the flusher | |
4231 | * may have to commit the transaction, which would mean we would | |
4232 | * deadlock since we are waiting for the flusher to finish, but | |
4233 | * hold the current transaction open. | |
4234 | */ | |
663350ac | 4235 | if (current->journal_info) |
fdb5effd | 4236 | return -EAGAIN; |
b9688bb8 AJ |
4237 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4238 | /* Must have been killed, return */ | |
4239 | if (ret) | |
fdb5effd JB |
4240 | return -EINTR; |
4241 | ||
4242 | spin_lock(&space_info->lock); | |
4243 | } | |
4244 | ||
4245 | ret = -ENOSPC; | |
2bf64758 JB |
4246 | used = space_info->bytes_used + space_info->bytes_reserved + |
4247 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4248 | space_info->bytes_may_use; | |
9ed74f2d | 4249 | |
8bb8ab2e JB |
4250 | /* |
4251 | * The idea here is that we've not already over-reserved the block group | |
4252 | * then we can go ahead and save our reservation first and then start | |
4253 | * flushing if we need to. Otherwise if we've already overcommitted | |
4254 | * lets start flushing stuff first and then come back and try to make | |
4255 | * our reservation. | |
4256 | */ | |
2bf64758 JB |
4257 | if (used <= space_info->total_bytes) { |
4258 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4259 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4260 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4261 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4262 | ret = 0; |
4263 | } else { | |
4264 | /* | |
4265 | * Ok set num_bytes to orig_bytes since we aren't | |
4266 | * overocmmitted, this way we only try and reclaim what | |
4267 | * we need. | |
4268 | */ | |
4269 | num_bytes = orig_bytes; | |
4270 | } | |
4271 | } else { | |
4272 | /* | |
4273 | * Ok we're over committed, set num_bytes to the overcommitted | |
4274 | * amount plus the amount of bytes that we need for this | |
4275 | * reservation. | |
4276 | */ | |
2bf64758 | 4277 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4278 | (orig_bytes * 2); |
8bb8ab2e | 4279 | } |
9ed74f2d | 4280 | |
44734ed1 JB |
4281 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4282 | space_info->bytes_may_use += orig_bytes; | |
4283 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4284 | space_info->flags, orig_bytes, | |
4285 | 1); | |
4286 | ret = 0; | |
2bf64758 JB |
4287 | } |
4288 | ||
8bb8ab2e JB |
4289 | /* |
4290 | * Couldn't make our reservation, save our place so while we're trying | |
4291 | * to reclaim space we can actually use it instead of somebody else | |
4292 | * stealing it from us. | |
08e007d2 MX |
4293 | * |
4294 | * We make the other tasks wait for the flush only when we can flush | |
4295 | * all things. | |
8bb8ab2e | 4296 | */ |
72bcd99d | 4297 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4298 | flushing = true; |
4299 | space_info->flush = 1; | |
8bb8ab2e | 4300 | } |
9ed74f2d | 4301 | |
f0486c68 | 4302 | spin_unlock(&space_info->lock); |
9ed74f2d | 4303 | |
08e007d2 | 4304 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4305 | goto out; |
f0486c68 | 4306 | |
96c3f433 JB |
4307 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4308 | flush_state); | |
4309 | flush_state++; | |
08e007d2 MX |
4310 | |
4311 | /* | |
4312 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4313 | * would happen. So skip delalloc flush. | |
4314 | */ | |
4315 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4316 | (flush_state == FLUSH_DELALLOC || | |
4317 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4318 | flush_state = ALLOC_CHUNK; | |
4319 | ||
96c3f433 | 4320 | if (!ret) |
8bb8ab2e | 4321 | goto again; |
08e007d2 MX |
4322 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4323 | flush_state < COMMIT_TRANS) | |
4324 | goto again; | |
4325 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4326 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4327 | goto again; |
4328 | ||
4329 | out: | |
5d80366e JB |
4330 | if (ret == -ENOSPC && |
4331 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4332 | struct btrfs_block_rsv *global_rsv = | |
4333 | &root->fs_info->global_block_rsv; | |
4334 | ||
4335 | if (block_rsv != global_rsv && | |
4336 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4337 | ret = 0; | |
4338 | } | |
fdb5effd | 4339 | if (flushing) { |
8bb8ab2e | 4340 | spin_lock(&space_info->lock); |
fdb5effd JB |
4341 | space_info->flush = 0; |
4342 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4343 | spin_unlock(&space_info->lock); |
f0486c68 | 4344 | } |
f0486c68 YZ |
4345 | return ret; |
4346 | } | |
4347 | ||
79787eaa JM |
4348 | static struct btrfs_block_rsv *get_block_rsv( |
4349 | const struct btrfs_trans_handle *trans, | |
4350 | const struct btrfs_root *root) | |
f0486c68 | 4351 | { |
4c13d758 JB |
4352 | struct btrfs_block_rsv *block_rsv = NULL; |
4353 | ||
0e721106 JB |
4354 | if (root->ref_cows) |
4355 | block_rsv = trans->block_rsv; | |
4356 | ||
4357 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4358 | block_rsv = trans->block_rsv; |
4c13d758 JB |
4359 | |
4360 | if (!block_rsv) | |
f0486c68 YZ |
4361 | block_rsv = root->block_rsv; |
4362 | ||
4363 | if (!block_rsv) | |
4364 | block_rsv = &root->fs_info->empty_block_rsv; | |
4365 | ||
4366 | return block_rsv; | |
4367 | } | |
4368 | ||
4369 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4370 | u64 num_bytes) | |
4371 | { | |
4372 | int ret = -ENOSPC; | |
4373 | spin_lock(&block_rsv->lock); | |
4374 | if (block_rsv->reserved >= num_bytes) { | |
4375 | block_rsv->reserved -= num_bytes; | |
4376 | if (block_rsv->reserved < block_rsv->size) | |
4377 | block_rsv->full = 0; | |
4378 | ret = 0; | |
4379 | } | |
4380 | spin_unlock(&block_rsv->lock); | |
4381 | return ret; | |
4382 | } | |
4383 | ||
4384 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4385 | u64 num_bytes, int update_size) | |
4386 | { | |
4387 | spin_lock(&block_rsv->lock); | |
4388 | block_rsv->reserved += num_bytes; | |
4389 | if (update_size) | |
4390 | block_rsv->size += num_bytes; | |
4391 | else if (block_rsv->reserved >= block_rsv->size) | |
4392 | block_rsv->full = 1; | |
4393 | spin_unlock(&block_rsv->lock); | |
4394 | } | |
4395 | ||
d52be818 JB |
4396 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
4397 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4398 | int min_factor) | |
4399 | { | |
4400 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4401 | u64 min_bytes; | |
4402 | ||
4403 | if (global_rsv->space_info != dest->space_info) | |
4404 | return -ENOSPC; | |
4405 | ||
4406 | spin_lock(&global_rsv->lock); | |
4407 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4408 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4409 | spin_unlock(&global_rsv->lock); | |
4410 | return -ENOSPC; | |
4411 | } | |
4412 | global_rsv->reserved -= num_bytes; | |
4413 | if (global_rsv->reserved < global_rsv->size) | |
4414 | global_rsv->full = 0; | |
4415 | spin_unlock(&global_rsv->lock); | |
4416 | ||
4417 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4418 | return 0; | |
4419 | } | |
4420 | ||
8c2a3ca2 JB |
4421 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4422 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4423 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4424 | { |
4425 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4426 | ||
4427 | spin_lock(&block_rsv->lock); | |
4428 | if (num_bytes == (u64)-1) | |
4429 | num_bytes = block_rsv->size; | |
4430 | block_rsv->size -= num_bytes; | |
4431 | if (block_rsv->reserved >= block_rsv->size) { | |
4432 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4433 | block_rsv->reserved = block_rsv->size; | |
4434 | block_rsv->full = 1; | |
4435 | } else { | |
4436 | num_bytes = 0; | |
4437 | } | |
4438 | spin_unlock(&block_rsv->lock); | |
4439 | ||
4440 | if (num_bytes > 0) { | |
4441 | if (dest) { | |
e9e22899 JB |
4442 | spin_lock(&dest->lock); |
4443 | if (!dest->full) { | |
4444 | u64 bytes_to_add; | |
4445 | ||
4446 | bytes_to_add = dest->size - dest->reserved; | |
4447 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4448 | dest->reserved += bytes_to_add; | |
4449 | if (dest->reserved >= dest->size) | |
4450 | dest->full = 1; | |
4451 | num_bytes -= bytes_to_add; | |
4452 | } | |
4453 | spin_unlock(&dest->lock); | |
4454 | } | |
4455 | if (num_bytes) { | |
f0486c68 | 4456 | spin_lock(&space_info->lock); |
fb25e914 | 4457 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4458 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4459 | space_info->flags, num_bytes, 0); |
36e39c40 | 4460 | space_info->reservation_progress++; |
f0486c68 | 4461 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4462 | } |
9ed74f2d | 4463 | } |
f0486c68 | 4464 | } |
4e06bdd6 | 4465 | |
f0486c68 YZ |
4466 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4467 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4468 | { | |
4469 | int ret; | |
9ed74f2d | 4470 | |
f0486c68 YZ |
4471 | ret = block_rsv_use_bytes(src, num_bytes); |
4472 | if (ret) | |
4473 | return ret; | |
9ed74f2d | 4474 | |
f0486c68 | 4475 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4476 | return 0; |
4477 | } | |
4478 | ||
66d8f3dd | 4479 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4480 | { |
f0486c68 YZ |
4481 | memset(rsv, 0, sizeof(*rsv)); |
4482 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4483 | rsv->type = type; |
f0486c68 YZ |
4484 | } |
4485 | ||
66d8f3dd MX |
4486 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4487 | unsigned short type) | |
f0486c68 YZ |
4488 | { |
4489 | struct btrfs_block_rsv *block_rsv; | |
4490 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4491 | |
f0486c68 YZ |
4492 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4493 | if (!block_rsv) | |
4494 | return NULL; | |
9ed74f2d | 4495 | |
66d8f3dd | 4496 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4497 | block_rsv->space_info = __find_space_info(fs_info, |
4498 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4499 | return block_rsv; |
4500 | } | |
9ed74f2d | 4501 | |
f0486c68 YZ |
4502 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4503 | struct btrfs_block_rsv *rsv) | |
4504 | { | |
2aaa6655 JB |
4505 | if (!rsv) |
4506 | return; | |
dabdb640 JB |
4507 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4508 | kfree(rsv); | |
9ed74f2d JB |
4509 | } |
4510 | ||
08e007d2 MX |
4511 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4512 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4513 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4514 | { |
f0486c68 | 4515 | int ret; |
9ed74f2d | 4516 | |
f0486c68 YZ |
4517 | if (num_bytes == 0) |
4518 | return 0; | |
8bb8ab2e | 4519 | |
61b520a9 | 4520 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4521 | if (!ret) { |
4522 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4523 | return 0; | |
4524 | } | |
9ed74f2d | 4525 | |
f0486c68 | 4526 | return ret; |
f0486c68 | 4527 | } |
9ed74f2d | 4528 | |
4a92b1b8 | 4529 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4530 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4531 | { |
4532 | u64 num_bytes = 0; | |
f0486c68 | 4533 | int ret = -ENOSPC; |
9ed74f2d | 4534 | |
f0486c68 YZ |
4535 | if (!block_rsv) |
4536 | return 0; | |
9ed74f2d | 4537 | |
f0486c68 | 4538 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4539 | num_bytes = div_factor(block_rsv->size, min_factor); |
4540 | if (block_rsv->reserved >= num_bytes) | |
4541 | ret = 0; | |
4542 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4543 | |
36ba022a JB |
4544 | return ret; |
4545 | } | |
4546 | ||
08e007d2 MX |
4547 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4548 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4549 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4550 | { |
4551 | u64 num_bytes = 0; | |
4552 | int ret = -ENOSPC; | |
4553 | ||
4554 | if (!block_rsv) | |
4555 | return 0; | |
4556 | ||
4557 | spin_lock(&block_rsv->lock); | |
4558 | num_bytes = min_reserved; | |
13553e52 | 4559 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4560 | ret = 0; |
13553e52 | 4561 | else |
f0486c68 | 4562 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4563 | spin_unlock(&block_rsv->lock); |
13553e52 | 4564 | |
f0486c68 YZ |
4565 | if (!ret) |
4566 | return 0; | |
4567 | ||
aa38a711 | 4568 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4569 | if (!ret) { |
4570 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4571 | return 0; |
6a63209f | 4572 | } |
9ed74f2d | 4573 | |
13553e52 | 4574 | return ret; |
f0486c68 YZ |
4575 | } |
4576 | ||
4577 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4578 | struct btrfs_block_rsv *dst_rsv, | |
4579 | u64 num_bytes) | |
4580 | { | |
4581 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4582 | } | |
4583 | ||
4584 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4585 | struct btrfs_block_rsv *block_rsv, | |
4586 | u64 num_bytes) | |
4587 | { | |
4588 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4589 | if (global_rsv->full || global_rsv == block_rsv || | |
4590 | block_rsv->space_info != global_rsv->space_info) | |
4591 | global_rsv = NULL; | |
8c2a3ca2 JB |
4592 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4593 | num_bytes); | |
6a63209f JB |
4594 | } |
4595 | ||
4596 | /* | |
8929ecfa YZ |
4597 | * helper to calculate size of global block reservation. |
4598 | * the desired value is sum of space used by extent tree, | |
4599 | * checksum tree and root tree | |
6a63209f | 4600 | */ |
8929ecfa | 4601 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4602 | { |
8929ecfa YZ |
4603 | struct btrfs_space_info *sinfo; |
4604 | u64 num_bytes; | |
4605 | u64 meta_used; | |
4606 | u64 data_used; | |
6c41761f | 4607 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4608 | |
8929ecfa YZ |
4609 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4610 | spin_lock(&sinfo->lock); | |
4611 | data_used = sinfo->bytes_used; | |
4612 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4613 | |
8929ecfa YZ |
4614 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4615 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4616 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4617 | data_used = 0; | |
8929ecfa YZ |
4618 | meta_used = sinfo->bytes_used; |
4619 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4620 | |
8929ecfa YZ |
4621 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4622 | csum_size * 2; | |
4623 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4624 | |
8929ecfa | 4625 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4626 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4627 | |
8929ecfa YZ |
4628 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4629 | } | |
6a63209f | 4630 | |
8929ecfa YZ |
4631 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4632 | { | |
4633 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4634 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4635 | u64 num_bytes; | |
6a63209f | 4636 | |
8929ecfa | 4637 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4638 | |
8929ecfa | 4639 | spin_lock(&sinfo->lock); |
1f699d38 | 4640 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4641 | |
fdf30d1c | 4642 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4643 | |
8929ecfa | 4644 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4645 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4646 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4647 | |
4648 | if (sinfo->total_bytes > num_bytes) { | |
4649 | num_bytes = sinfo->total_bytes - num_bytes; | |
4650 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4651 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4652 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4653 | sinfo->flags, num_bytes, 1); |
6a63209f | 4654 | } |
6a63209f | 4655 | |
8929ecfa YZ |
4656 | if (block_rsv->reserved >= block_rsv->size) { |
4657 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4658 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4659 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4660 | sinfo->flags, num_bytes, 0); |
36e39c40 | 4661 | sinfo->reservation_progress++; |
8929ecfa YZ |
4662 | block_rsv->reserved = block_rsv->size; |
4663 | block_rsv->full = 1; | |
4664 | } | |
182608c8 | 4665 | |
8929ecfa | 4666 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4667 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4668 | } |
4669 | ||
f0486c68 | 4670 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4671 | { |
f0486c68 | 4672 | struct btrfs_space_info *space_info; |
6a63209f | 4673 | |
f0486c68 YZ |
4674 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4675 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4676 | |
f0486c68 | 4677 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4678 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4679 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4680 | fs_info->trans_block_rsv.space_info = space_info; |
4681 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4682 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4683 | |
8929ecfa YZ |
4684 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4685 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4686 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4687 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
4688 | if (fs_info->quota_root) |
4689 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4690 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4691 | |
8929ecfa | 4692 | update_global_block_rsv(fs_info); |
6a63209f JB |
4693 | } |
4694 | ||
8929ecfa | 4695 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4696 | { |
8c2a3ca2 JB |
4697 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4698 | (u64)-1); | |
8929ecfa YZ |
4699 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4700 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4701 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4702 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4703 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4704 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4705 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4706 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4707 | } |
4708 | ||
a22285a6 YZ |
4709 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4710 | struct btrfs_root *root) | |
6a63209f | 4711 | { |
0e721106 JB |
4712 | if (!trans->block_rsv) |
4713 | return; | |
4714 | ||
a22285a6 YZ |
4715 | if (!trans->bytes_reserved) |
4716 | return; | |
6a63209f | 4717 | |
e77266e4 | 4718 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4719 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4720 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4721 | trans->bytes_reserved = 0; |
4722 | } | |
6a63209f | 4723 | |
79787eaa | 4724 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4725 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4726 | struct inode *inode) | |
4727 | { | |
4728 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4729 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4730 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4731 | ||
4732 | /* | |
fcb80c2a JB |
4733 | * We need to hold space in order to delete our orphan item once we've |
4734 | * added it, so this takes the reservation so we can release it later | |
4735 | * when we are truly done with the orphan item. | |
d68fc57b | 4736 | */ |
ff5714cc | 4737 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4738 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4739 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4740 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4741 | } |
4742 | ||
d68fc57b | 4743 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4744 | { |
d68fc57b | 4745 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4746 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4747 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4748 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4749 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4750 | } | |
97e728d4 | 4751 | |
d5c12070 MX |
4752 | /* |
4753 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4754 | * root: the root of the parent directory | |
4755 | * rsv: block reservation | |
4756 | * items: the number of items that we need do reservation | |
4757 | * qgroup_reserved: used to return the reserved size in qgroup | |
4758 | * | |
4759 | * This function is used to reserve the space for snapshot/subvolume | |
4760 | * creation and deletion. Those operations are different with the | |
4761 | * common file/directory operations, they change two fs/file trees | |
4762 | * and root tree, the number of items that the qgroup reserves is | |
4763 | * different with the free space reservation. So we can not use | |
4764 | * the space reseravtion mechanism in start_transaction(). | |
4765 | */ | |
4766 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4767 | struct btrfs_block_rsv *rsv, | |
4768 | int items, | |
ee3441b4 JM |
4769 | u64 *qgroup_reserved, |
4770 | bool use_global_rsv) | |
a22285a6 | 4771 | { |
d5c12070 MX |
4772 | u64 num_bytes; |
4773 | int ret; | |
ee3441b4 | 4774 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
d5c12070 MX |
4775 | |
4776 | if (root->fs_info->quota_enabled) { | |
4777 | /* One for parent inode, two for dir entries */ | |
4778 | num_bytes = 3 * root->leafsize; | |
4779 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4780 | if (ret) | |
4781 | return ret; | |
4782 | } else { | |
4783 | num_bytes = 0; | |
4784 | } | |
4785 | ||
4786 | *qgroup_reserved = num_bytes; | |
4787 | ||
4788 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4789 | rsv->space_info = __find_space_info(root->fs_info, | |
4790 | BTRFS_BLOCK_GROUP_METADATA); | |
4791 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4792 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
4793 | |
4794 | if (ret == -ENOSPC && use_global_rsv) | |
4795 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); | |
4796 | ||
d5c12070 MX |
4797 | if (ret) { |
4798 | if (*qgroup_reserved) | |
4799 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4800 | } | |
4801 | ||
4802 | return ret; | |
4803 | } | |
4804 | ||
4805 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4806 | struct btrfs_block_rsv *rsv, | |
4807 | u64 qgroup_reserved) | |
4808 | { | |
4809 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4810 | if (qgroup_reserved) | |
4811 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4812 | } |
4813 | ||
7709cde3 JB |
4814 | /** |
4815 | * drop_outstanding_extent - drop an outstanding extent | |
4816 | * @inode: the inode we're dropping the extent for | |
4817 | * | |
4818 | * This is called when we are freeing up an outstanding extent, either called | |
4819 | * after an error or after an extent is written. This will return the number of | |
4820 | * reserved extents that need to be freed. This must be called with | |
4821 | * BTRFS_I(inode)->lock held. | |
4822 | */ | |
9e0baf60 JB |
4823 | static unsigned drop_outstanding_extent(struct inode *inode) |
4824 | { | |
7fd2ae21 | 4825 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4826 | unsigned dropped_extents = 0; |
4827 | ||
9e0baf60 JB |
4828 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4829 | BTRFS_I(inode)->outstanding_extents--; | |
4830 | ||
7fd2ae21 | 4831 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4832 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4833 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4834 | drop_inode_space = 1; |
7fd2ae21 | 4835 | |
9e0baf60 JB |
4836 | /* |
4837 | * If we have more or the same amount of outsanding extents than we have | |
4838 | * reserved then we need to leave the reserved extents count alone. | |
4839 | */ | |
4840 | if (BTRFS_I(inode)->outstanding_extents >= | |
4841 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4842 | return drop_inode_space; |
9e0baf60 JB |
4843 | |
4844 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4845 | BTRFS_I(inode)->outstanding_extents; | |
4846 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4847 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4848 | } |
4849 | ||
7709cde3 JB |
4850 | /** |
4851 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4852 | * reserved/free'd for the given bytes. | |
4853 | * @inode: the inode we're manipulating | |
4854 | * @num_bytes: the number of bytes in question | |
4855 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4856 | * | |
4857 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4858 | * correct amount of metadata that must either be reserved or freed. We | |
4859 | * calculate how many checksums we can fit into one leaf and then divide the | |
4860 | * number of bytes that will need to be checksumed by this value to figure out | |
4861 | * how many checksums will be required. If we are adding bytes then the number | |
4862 | * may go up and we will return the number of additional bytes that must be | |
4863 | * reserved. If it is going down we will return the number of bytes that must | |
4864 | * be freed. | |
4865 | * | |
4866 | * This must be called with BTRFS_I(inode)->lock held. | |
4867 | */ | |
4868 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4869 | int reserve) | |
6324fbf3 | 4870 | { |
7709cde3 JB |
4871 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4872 | u64 csum_size; | |
4873 | int num_csums_per_leaf; | |
4874 | int num_csums; | |
4875 | int old_csums; | |
4876 | ||
4877 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4878 | BTRFS_I(inode)->csum_bytes == 0) | |
4879 | return 0; | |
4880 | ||
4881 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4882 | if (reserve) | |
4883 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4884 | else | |
4885 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4886 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4887 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4888 | sizeof(struct btrfs_csum_item) + | |
4889 | sizeof(struct btrfs_disk_key)); | |
4890 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4891 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4892 | num_csums = num_csums / num_csums_per_leaf; | |
4893 | ||
4894 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4895 | old_csums = old_csums / num_csums_per_leaf; | |
4896 | ||
4897 | /* No change, no need to reserve more */ | |
4898 | if (old_csums == num_csums) | |
4899 | return 0; | |
4900 | ||
4901 | if (reserve) | |
4902 | return btrfs_calc_trans_metadata_size(root, | |
4903 | num_csums - old_csums); | |
4904 | ||
4905 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4906 | } |
c146afad | 4907 | |
0ca1f7ce YZ |
4908 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4909 | { | |
4910 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4911 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4912 | u64 to_reserve = 0; |
660d3f6c | 4913 | u64 csum_bytes; |
9e0baf60 | 4914 | unsigned nr_extents = 0; |
660d3f6c | 4915 | int extra_reserve = 0; |
08e007d2 | 4916 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4917 | int ret = 0; |
c64c2bd8 | 4918 | bool delalloc_lock = true; |
88e081bf WS |
4919 | u64 to_free = 0; |
4920 | unsigned dropped; | |
6324fbf3 | 4921 | |
c64c2bd8 JB |
4922 | /* If we are a free space inode we need to not flush since we will be in |
4923 | * the middle of a transaction commit. We also don't need the delalloc | |
4924 | * mutex since we won't race with anybody. We need this mostly to make | |
4925 | * lockdep shut its filthy mouth. | |
4926 | */ | |
4927 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4928 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4929 | delalloc_lock = false; |
4930 | } | |
c09544e0 | 4931 | |
08e007d2 MX |
4932 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4933 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4934 | schedule_timeout(1); |
ec44a35c | 4935 | |
c64c2bd8 JB |
4936 | if (delalloc_lock) |
4937 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4938 | ||
0ca1f7ce | 4939 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4940 | |
9e0baf60 JB |
4941 | spin_lock(&BTRFS_I(inode)->lock); |
4942 | BTRFS_I(inode)->outstanding_extents++; | |
4943 | ||
4944 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4945 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4946 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4947 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4948 | |
7fd2ae21 JB |
4949 | /* |
4950 | * Add an item to reserve for updating the inode when we complete the | |
4951 | * delalloc io. | |
4952 | */ | |
72ac3c0d JB |
4953 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4954 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4955 | nr_extents++; |
660d3f6c | 4956 | extra_reserve = 1; |
593060d7 | 4957 | } |
7fd2ae21 JB |
4958 | |
4959 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4960 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4961 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4962 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4963 | |
88e081bf | 4964 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4965 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4966 | nr_extents * root->leafsize); | |
88e081bf WS |
4967 | if (ret) |
4968 | goto out_fail; | |
4969 | } | |
c5567237 | 4970 | |
88e081bf WS |
4971 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4972 | if (unlikely(ret)) { | |
4973 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4974 | btrfs_qgroup_free(root, num_bytes + |
4975 | nr_extents * root->leafsize); | |
88e081bf | 4976 | goto out_fail; |
9e0baf60 | 4977 | } |
25179201 | 4978 | |
660d3f6c JB |
4979 | spin_lock(&BTRFS_I(inode)->lock); |
4980 | if (extra_reserve) { | |
72ac3c0d JB |
4981 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4982 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
4983 | nr_extents--; |
4984 | } | |
4985 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4986 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
4987 | |
4988 | if (delalloc_lock) | |
4989 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 4990 | |
8c2a3ca2 JB |
4991 | if (to_reserve) |
4992 | trace_btrfs_space_reservation(root->fs_info,"delalloc", | |
4993 | btrfs_ino(inode), to_reserve, 1); | |
0ca1f7ce YZ |
4994 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4995 | ||
0ca1f7ce | 4996 | return 0; |
88e081bf WS |
4997 | |
4998 | out_fail: | |
4999 | spin_lock(&BTRFS_I(inode)->lock); | |
5000 | dropped = drop_outstanding_extent(inode); | |
5001 | /* | |
5002 | * If the inodes csum_bytes is the same as the original | |
5003 | * csum_bytes then we know we haven't raced with any free()ers | |
5004 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 5005 | */ |
f4881bc7 | 5006 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 5007 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
5008 | } else { |
5009 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5010 | u64 bytes; | |
5011 | ||
5012 | /* | |
5013 | * This is tricky, but first we need to figure out how much we | |
5014 | * free'd from any free-ers that occured during this | |
5015 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
5016 | * before we dropped our lock, and then call the free for the | |
5017 | * number of bytes that were freed while we were trying our | |
5018 | * reservation. | |
5019 | */ | |
5020 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
5021 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
5022 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
5023 | ||
5024 | ||
5025 | /* | |
5026 | * Now we need to see how much we would have freed had we not | |
5027 | * been making this reservation and our ->csum_bytes were not | |
5028 | * artificially inflated. | |
5029 | */ | |
5030 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
5031 | bytes = csum_bytes - orig_csum_bytes; | |
5032 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
5033 | ||
5034 | /* | |
5035 | * Now reset ->csum_bytes to what it should be. If bytes is | |
5036 | * more than to_free then we would have free'd more space had we | |
5037 | * not had an artificially high ->csum_bytes, so we need to free | |
5038 | * the remainder. If bytes is the same or less then we don't | |
5039 | * need to do anything, the other free-ers did the correct | |
5040 | * thing. | |
5041 | */ | |
5042 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5043 | if (bytes > to_free) | |
5044 | to_free = bytes - to_free; | |
5045 | else | |
5046 | to_free = 0; | |
5047 | } | |
88e081bf WS |
5048 | spin_unlock(&BTRFS_I(inode)->lock); |
5049 | if (dropped) | |
5050 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5051 | ||
5052 | if (to_free) { | |
5053 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5054 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5055 | btrfs_ino(inode), to_free, 0); | |
5056 | } | |
5057 | if (delalloc_lock) | |
5058 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5059 | return ret; | |
0ca1f7ce YZ |
5060 | } |
5061 | ||
7709cde3 JB |
5062 | /** |
5063 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5064 | * @inode: the inode to release the reservation for | |
5065 | * @num_bytes: the number of bytes we're releasing | |
5066 | * | |
5067 | * This will release the metadata reservation for an inode. This can be called | |
5068 | * once we complete IO for a given set of bytes to release their metadata | |
5069 | * reservations. | |
5070 | */ | |
0ca1f7ce YZ |
5071 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
5072 | { | |
5073 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
5074 | u64 to_free = 0; |
5075 | unsigned dropped; | |
0ca1f7ce YZ |
5076 | |
5077 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 5078 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 5079 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 5080 | |
0934856d MX |
5081 | if (num_bytes) |
5082 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 5083 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5084 | if (dropped > 0) |
5085 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5086 | |
8c2a3ca2 JB |
5087 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5088 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
5089 | if (root->fs_info->quota_enabled) { |
5090 | btrfs_qgroup_free(root, num_bytes + | |
5091 | dropped * root->leafsize); | |
5092 | } | |
5093 | ||
0ca1f7ce YZ |
5094 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5095 | to_free); | |
5096 | } | |
5097 | ||
7709cde3 JB |
5098 | /** |
5099 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5100 | * @inode: inode we're writing to | |
5101 | * @num_bytes: the number of bytes we want to allocate | |
5102 | * | |
5103 | * This will do the following things | |
5104 | * | |
5105 | * o reserve space in the data space info for num_bytes | |
5106 | * o reserve space in the metadata space info based on number of outstanding | |
5107 | * extents and how much csums will be needed | |
5108 | * o add to the inodes ->delalloc_bytes | |
5109 | * o add it to the fs_info's delalloc inodes list. | |
5110 | * | |
5111 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5112 | */ | |
0ca1f7ce YZ |
5113 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5114 | { | |
5115 | int ret; | |
5116 | ||
5117 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 5118 | if (ret) |
0ca1f7ce YZ |
5119 | return ret; |
5120 | ||
5121 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5122 | if (ret) { | |
5123 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5124 | return ret; | |
5125 | } | |
5126 | ||
5127 | return 0; | |
5128 | } | |
5129 | ||
7709cde3 JB |
5130 | /** |
5131 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5132 | * @inode: inode we're releasing space for | |
5133 | * @num_bytes: the number of bytes we want to free up | |
5134 | * | |
5135 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5136 | * called in the case that we don't need the metadata AND data reservations | |
5137 | * anymore. So if there is an error or we insert an inline extent. | |
5138 | * | |
5139 | * This function will release the metadata space that was not used and will | |
5140 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5141 | * list if there are no delalloc bytes left. | |
5142 | */ | |
0ca1f7ce YZ |
5143 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5144 | { | |
5145 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5146 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5147 | } |
5148 | ||
c53d613e | 5149 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 5150 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 5151 | { |
0af3d00b | 5152 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5153 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5154 | u64 total = num_bytes; |
9078a3e1 | 5155 | u64 old_val; |
db94535d | 5156 | u64 byte_in_group; |
0af3d00b | 5157 | int factor; |
3e1ad54f | 5158 | |
5d4f98a2 | 5159 | /* block accounting for super block */ |
eb73c1b7 | 5160 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 5161 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5162 | if (alloc) |
5163 | old_val += num_bytes; | |
5164 | else | |
5165 | old_val -= num_bytes; | |
6c41761f | 5166 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 5167 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 5168 | |
d397712b | 5169 | while (total) { |
db94535d | 5170 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5171 | if (!cache) |
79787eaa | 5172 | return -ENOENT; |
b742bb82 YZ |
5173 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5174 | BTRFS_BLOCK_GROUP_RAID1 | | |
5175 | BTRFS_BLOCK_GROUP_RAID10)) | |
5176 | factor = 2; | |
5177 | else | |
5178 | factor = 1; | |
9d66e233 JB |
5179 | /* |
5180 | * If this block group has free space cache written out, we | |
5181 | * need to make sure to load it if we are removing space. This | |
5182 | * is because we need the unpinning stage to actually add the | |
5183 | * space back to the block group, otherwise we will leak space. | |
5184 | */ | |
5185 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5186 | cache_block_group(cache, 1); |
0af3d00b | 5187 | |
db94535d CM |
5188 | byte_in_group = bytenr - cache->key.objectid; |
5189 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5190 | |
25179201 | 5191 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5192 | spin_lock(&cache->lock); |
0af3d00b | 5193 | |
73bc1876 | 5194 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5195 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5196 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5197 | ||
0f9dd46c | 5198 | cache->dirty = 1; |
9078a3e1 | 5199 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5200 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5201 | if (alloc) { |
db94535d | 5202 | old_val += num_bytes; |
11833d66 YZ |
5203 | btrfs_set_block_group_used(&cache->item, old_val); |
5204 | cache->reserved -= num_bytes; | |
11833d66 | 5205 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5206 | cache->space_info->bytes_used += num_bytes; |
5207 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5208 | spin_unlock(&cache->lock); |
25179201 | 5209 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5210 | } else { |
db94535d | 5211 | old_val -= num_bytes; |
c286ac48 | 5212 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5213 | cache->pinned += num_bytes; |
5214 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5215 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5216 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5217 | spin_unlock(&cache->lock); |
25179201 | 5218 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5219 | |
f0486c68 YZ |
5220 | set_extent_dirty(info->pinned_extents, |
5221 | bytenr, bytenr + num_bytes - 1, | |
5222 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5223 | } |
fa9c0d79 | 5224 | btrfs_put_block_group(cache); |
db94535d CM |
5225 | total -= num_bytes; |
5226 | bytenr += num_bytes; | |
9078a3e1 CM |
5227 | } |
5228 | return 0; | |
5229 | } | |
6324fbf3 | 5230 | |
a061fc8d CM |
5231 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5232 | { | |
0f9dd46c | 5233 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5234 | u64 bytenr; |
0f9dd46c | 5235 | |
a1897fdd LB |
5236 | spin_lock(&root->fs_info->block_group_cache_lock); |
5237 | bytenr = root->fs_info->first_logical_byte; | |
5238 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5239 | ||
5240 | if (bytenr < (u64)-1) | |
5241 | return bytenr; | |
5242 | ||
0f9dd46c JB |
5243 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5244 | if (!cache) | |
a061fc8d | 5245 | return 0; |
0f9dd46c | 5246 | |
d2fb3437 | 5247 | bytenr = cache->key.objectid; |
fa9c0d79 | 5248 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5249 | |
5250 | return bytenr; | |
a061fc8d CM |
5251 | } |
5252 | ||
f0486c68 YZ |
5253 | static int pin_down_extent(struct btrfs_root *root, |
5254 | struct btrfs_block_group_cache *cache, | |
5255 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5256 | { |
11833d66 YZ |
5257 | spin_lock(&cache->space_info->lock); |
5258 | spin_lock(&cache->lock); | |
5259 | cache->pinned += num_bytes; | |
5260 | cache->space_info->bytes_pinned += num_bytes; | |
5261 | if (reserved) { | |
5262 | cache->reserved -= num_bytes; | |
5263 | cache->space_info->bytes_reserved -= num_bytes; | |
5264 | } | |
5265 | spin_unlock(&cache->lock); | |
5266 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5267 | |
f0486c68 YZ |
5268 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5269 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
5270 | return 0; | |
5271 | } | |
68b38550 | 5272 | |
f0486c68 YZ |
5273 | /* |
5274 | * this function must be called within transaction | |
5275 | */ | |
5276 | int btrfs_pin_extent(struct btrfs_root *root, | |
5277 | u64 bytenr, u64 num_bytes, int reserved) | |
5278 | { | |
5279 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5280 | |
f0486c68 | 5281 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5282 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5283 | |
5284 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5285 | ||
5286 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5287 | return 0; |
5288 | } | |
5289 | ||
f0486c68 | 5290 | /* |
e688b725 CM |
5291 | * this function must be called within transaction |
5292 | */ | |
dcfac415 | 5293 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5294 | u64 bytenr, u64 num_bytes) |
5295 | { | |
5296 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5297 | int ret; |
e688b725 CM |
5298 | |
5299 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5300 | if (!cache) |
5301 | return -EINVAL; | |
e688b725 CM |
5302 | |
5303 | /* | |
5304 | * pull in the free space cache (if any) so that our pin | |
5305 | * removes the free space from the cache. We have load_only set | |
5306 | * to one because the slow code to read in the free extents does check | |
5307 | * the pinned extents. | |
5308 | */ | |
f6373bf3 | 5309 | cache_block_group(cache, 1); |
e688b725 CM |
5310 | |
5311 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5312 | ||
5313 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5314 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5315 | btrfs_put_block_group(cache); |
b50c6e25 | 5316 | return ret; |
e688b725 CM |
5317 | } |
5318 | ||
8c2a1a30 JB |
5319 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
5320 | { | |
5321 | int ret; | |
5322 | struct btrfs_block_group_cache *block_group; | |
5323 | struct btrfs_caching_control *caching_ctl; | |
5324 | ||
5325 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5326 | if (!block_group) | |
5327 | return -EINVAL; | |
5328 | ||
5329 | cache_block_group(block_group, 0); | |
5330 | caching_ctl = get_caching_control(block_group); | |
5331 | ||
5332 | if (!caching_ctl) { | |
5333 | /* Logic error */ | |
5334 | BUG_ON(!block_group_cache_done(block_group)); | |
5335 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5336 | } else { | |
5337 | mutex_lock(&caching_ctl->mutex); | |
5338 | ||
5339 | if (start >= caching_ctl->progress) { | |
5340 | ret = add_excluded_extent(root, start, num_bytes); | |
5341 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5342 | ret = btrfs_remove_free_space(block_group, | |
5343 | start, num_bytes); | |
5344 | } else { | |
5345 | num_bytes = caching_ctl->progress - start; | |
5346 | ret = btrfs_remove_free_space(block_group, | |
5347 | start, num_bytes); | |
5348 | if (ret) | |
5349 | goto out_lock; | |
5350 | ||
5351 | num_bytes = (start + num_bytes) - | |
5352 | caching_ctl->progress; | |
5353 | start = caching_ctl->progress; | |
5354 | ret = add_excluded_extent(root, start, num_bytes); | |
5355 | } | |
5356 | out_lock: | |
5357 | mutex_unlock(&caching_ctl->mutex); | |
5358 | put_caching_control(caching_ctl); | |
5359 | } | |
5360 | btrfs_put_block_group(block_group); | |
5361 | return ret; | |
5362 | } | |
5363 | ||
5364 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5365 | struct extent_buffer *eb) | |
5366 | { | |
5367 | struct btrfs_file_extent_item *item; | |
5368 | struct btrfs_key key; | |
5369 | int found_type; | |
5370 | int i; | |
5371 | ||
5372 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5373 | return 0; | |
5374 | ||
5375 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5376 | btrfs_item_key_to_cpu(eb, &key, i); | |
5377 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5378 | continue; | |
5379 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5380 | found_type = btrfs_file_extent_type(eb, item); | |
5381 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5382 | continue; | |
5383 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5384 | continue; | |
5385 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5386 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5387 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5388 | } | |
5389 | ||
5390 | return 0; | |
5391 | } | |
5392 | ||
fb25e914 JB |
5393 | /** |
5394 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5395 | * @cache: The cache we are manipulating | |
5396 | * @num_bytes: The number of bytes in question | |
5397 | * @reserve: One of the reservation enums | |
5398 | * | |
5399 | * This is called by the allocator when it reserves space, or by somebody who is | |
5400 | * freeing space that was never actually used on disk. For example if you | |
5401 | * reserve some space for a new leaf in transaction A and before transaction A | |
5402 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5403 | * clear the reservation. | |
5404 | * | |
5405 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5406 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5407 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5408 | * allocating less disk space for the amount of data we have reserved in the | |
5409 | * case of compression. | |
5410 | * | |
5411 | * If this is a reservation and the block group has become read only we cannot | |
5412 | * make the reservation and return -EAGAIN, otherwise this function always | |
5413 | * succeeds. | |
f0486c68 | 5414 | */ |
fb25e914 JB |
5415 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5416 | u64 num_bytes, int reserve) | |
11833d66 | 5417 | { |
fb25e914 | 5418 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5419 | int ret = 0; |
79787eaa | 5420 | |
fb25e914 JB |
5421 | spin_lock(&space_info->lock); |
5422 | spin_lock(&cache->lock); | |
5423 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5424 | if (cache->ro) { |
5425 | ret = -EAGAIN; | |
5426 | } else { | |
fb25e914 JB |
5427 | cache->reserved += num_bytes; |
5428 | space_info->bytes_reserved += num_bytes; | |
5429 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5430 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5431 | "space_info", space_info->flags, |
5432 | num_bytes, 0); | |
fb25e914 JB |
5433 | space_info->bytes_may_use -= num_bytes; |
5434 | } | |
f0486c68 | 5435 | } |
fb25e914 JB |
5436 | } else { |
5437 | if (cache->ro) | |
5438 | space_info->bytes_readonly += num_bytes; | |
5439 | cache->reserved -= num_bytes; | |
5440 | space_info->bytes_reserved -= num_bytes; | |
5441 | space_info->reservation_progress++; | |
324ae4df | 5442 | } |
fb25e914 JB |
5443 | spin_unlock(&cache->lock); |
5444 | spin_unlock(&space_info->lock); | |
f0486c68 | 5445 | return ret; |
324ae4df | 5446 | } |
9078a3e1 | 5447 | |
143bede5 | 5448 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5449 | struct btrfs_root *root) |
e8569813 | 5450 | { |
e8569813 | 5451 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5452 | struct btrfs_caching_control *next; |
5453 | struct btrfs_caching_control *caching_ctl; | |
5454 | struct btrfs_block_group_cache *cache; | |
b150a4f1 | 5455 | struct btrfs_space_info *space_info; |
e8569813 | 5456 | |
11833d66 | 5457 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5458 | |
11833d66 YZ |
5459 | list_for_each_entry_safe(caching_ctl, next, |
5460 | &fs_info->caching_block_groups, list) { | |
5461 | cache = caching_ctl->block_group; | |
5462 | if (block_group_cache_done(cache)) { | |
5463 | cache->last_byte_to_unpin = (u64)-1; | |
5464 | list_del_init(&caching_ctl->list); | |
5465 | put_caching_control(caching_ctl); | |
e8569813 | 5466 | } else { |
11833d66 | 5467 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5468 | } |
e8569813 | 5469 | } |
11833d66 YZ |
5470 | |
5471 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5472 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5473 | else | |
5474 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5475 | ||
5476 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa | 5477 | |
b150a4f1 JB |
5478 | list_for_each_entry_rcu(space_info, &fs_info->space_info, list) |
5479 | percpu_counter_set(&space_info->total_bytes_pinned, 0); | |
5480 | ||
8929ecfa | 5481 | update_global_block_rsv(fs_info); |
e8569813 ZY |
5482 | } |
5483 | ||
11833d66 | 5484 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5485 | { |
11833d66 YZ |
5486 | struct btrfs_fs_info *fs_info = root->fs_info; |
5487 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5488 | struct btrfs_space_info *space_info; |
5489 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5490 | u64 len; |
7b398f8e | 5491 | bool readonly; |
ccd467d6 | 5492 | |
11833d66 | 5493 | while (start <= end) { |
7b398f8e | 5494 | readonly = false; |
11833d66 YZ |
5495 | if (!cache || |
5496 | start >= cache->key.objectid + cache->key.offset) { | |
5497 | if (cache) | |
5498 | btrfs_put_block_group(cache); | |
5499 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5500 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5501 | } |
5502 | ||
5503 | len = cache->key.objectid + cache->key.offset - start; | |
5504 | len = min(len, end + 1 - start); | |
5505 | ||
5506 | if (start < cache->last_byte_to_unpin) { | |
5507 | len = min(len, cache->last_byte_to_unpin - start); | |
5508 | btrfs_add_free_space(cache, start, len); | |
5509 | } | |
5510 | ||
f0486c68 | 5511 | start += len; |
7b398f8e | 5512 | space_info = cache->space_info; |
f0486c68 | 5513 | |
7b398f8e | 5514 | spin_lock(&space_info->lock); |
11833d66 YZ |
5515 | spin_lock(&cache->lock); |
5516 | cache->pinned -= len; | |
7b398f8e JB |
5517 | space_info->bytes_pinned -= len; |
5518 | if (cache->ro) { | |
5519 | space_info->bytes_readonly += len; | |
5520 | readonly = true; | |
5521 | } | |
11833d66 | 5522 | spin_unlock(&cache->lock); |
7b398f8e JB |
5523 | if (!readonly && global_rsv->space_info == space_info) { |
5524 | spin_lock(&global_rsv->lock); | |
5525 | if (!global_rsv->full) { | |
5526 | len = min(len, global_rsv->size - | |
5527 | global_rsv->reserved); | |
5528 | global_rsv->reserved += len; | |
5529 | space_info->bytes_may_use += len; | |
5530 | if (global_rsv->reserved >= global_rsv->size) | |
5531 | global_rsv->full = 1; | |
5532 | } | |
5533 | spin_unlock(&global_rsv->lock); | |
5534 | } | |
5535 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5536 | } |
11833d66 YZ |
5537 | |
5538 | if (cache) | |
5539 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5540 | return 0; |
5541 | } | |
5542 | ||
5543 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5544 | struct btrfs_root *root) |
a28ec197 | 5545 | { |
11833d66 YZ |
5546 | struct btrfs_fs_info *fs_info = root->fs_info; |
5547 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5548 | u64 start; |
5549 | u64 end; | |
a28ec197 | 5550 | int ret; |
a28ec197 | 5551 | |
79787eaa JM |
5552 | if (trans->aborted) |
5553 | return 0; | |
5554 | ||
11833d66 YZ |
5555 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5556 | unpin = &fs_info->freed_extents[1]; | |
5557 | else | |
5558 | unpin = &fs_info->freed_extents[0]; | |
5559 | ||
d397712b | 5560 | while (1) { |
1a5bc167 | 5561 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5562 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5563 | if (ret) |
a28ec197 | 5564 | break; |
1f3c79a2 | 5565 | |
5378e607 LD |
5566 | if (btrfs_test_opt(root, DISCARD)) |
5567 | ret = btrfs_discard_extent(root, start, | |
5568 | end + 1 - start, NULL); | |
1f3c79a2 | 5569 | |
1a5bc167 | 5570 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5571 | unpin_extent_range(root, start, end); |
b9473439 | 5572 | cond_resched(); |
a28ec197 | 5573 | } |
817d52f8 | 5574 | |
e20d96d6 CM |
5575 | return 0; |
5576 | } | |
5577 | ||
b150a4f1 JB |
5578 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
5579 | u64 owner, u64 root_objectid) | |
5580 | { | |
5581 | struct btrfs_space_info *space_info; | |
5582 | u64 flags; | |
5583 | ||
5584 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
5585 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
5586 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
5587 | else | |
5588 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
5589 | } else { | |
5590 | flags = BTRFS_BLOCK_GROUP_DATA; | |
5591 | } | |
5592 | ||
5593 | space_info = __find_space_info(fs_info, flags); | |
5594 | BUG_ON(!space_info); /* Logic bug */ | |
5595 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
5596 | } | |
5597 | ||
5598 | ||
5d4f98a2 YZ |
5599 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5600 | struct btrfs_root *root, | |
5601 | u64 bytenr, u64 num_bytes, u64 parent, | |
5602 | u64 root_objectid, u64 owner_objectid, | |
5603 | u64 owner_offset, int refs_to_drop, | |
5604 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5605 | { |
e2fa7227 | 5606 | struct btrfs_key key; |
5d4f98a2 | 5607 | struct btrfs_path *path; |
1261ec42 CM |
5608 | struct btrfs_fs_info *info = root->fs_info; |
5609 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5610 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5611 | struct btrfs_extent_item *ei; |
5612 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5613 | int ret; |
5d4f98a2 | 5614 | int is_data; |
952fccac CM |
5615 | int extent_slot = 0; |
5616 | int found_extent = 0; | |
5617 | int num_to_del = 1; | |
5d4f98a2 YZ |
5618 | u32 item_size; |
5619 | u64 refs; | |
3173a18f JB |
5620 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
5621 | SKINNY_METADATA); | |
037e6390 | 5622 | |
5caf2a00 | 5623 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5624 | if (!path) |
5625 | return -ENOMEM; | |
5f26f772 | 5626 | |
3c12ac72 | 5627 | path->reada = 1; |
b9473439 | 5628 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5629 | |
5630 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5631 | BUG_ON(!is_data && refs_to_drop != 1); | |
5632 | ||
3173a18f JB |
5633 | if (is_data) |
5634 | skinny_metadata = 0; | |
5635 | ||
5d4f98a2 YZ |
5636 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
5637 | bytenr, num_bytes, parent, | |
5638 | root_objectid, owner_objectid, | |
5639 | owner_offset); | |
7bb86316 | 5640 | if (ret == 0) { |
952fccac | 5641 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5642 | while (extent_slot >= 0) { |
5643 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5644 | extent_slot); |
5d4f98a2 | 5645 | if (key.objectid != bytenr) |
952fccac | 5646 | break; |
5d4f98a2 YZ |
5647 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5648 | key.offset == num_bytes) { | |
952fccac CM |
5649 | found_extent = 1; |
5650 | break; | |
5651 | } | |
3173a18f JB |
5652 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
5653 | key.offset == owner_objectid) { | |
5654 | found_extent = 1; | |
5655 | break; | |
5656 | } | |
952fccac CM |
5657 | if (path->slots[0] - extent_slot > 5) |
5658 | break; | |
5d4f98a2 | 5659 | extent_slot--; |
952fccac | 5660 | } |
5d4f98a2 YZ |
5661 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5662 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5663 | if (found_extent && item_size < sizeof(*ei)) | |
5664 | found_extent = 0; | |
5665 | #endif | |
31840ae1 | 5666 | if (!found_extent) { |
5d4f98a2 | 5667 | BUG_ON(iref); |
56bec294 | 5668 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5669 | NULL, refs_to_drop, |
5670 | is_data); | |
005d6427 DS |
5671 | if (ret) { |
5672 | btrfs_abort_transaction(trans, extent_root, ret); | |
5673 | goto out; | |
5674 | } | |
b3b4aa74 | 5675 | btrfs_release_path(path); |
b9473439 | 5676 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5677 | |
5678 | key.objectid = bytenr; | |
5679 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5680 | key.offset = num_bytes; | |
5681 | ||
3173a18f JB |
5682 | if (!is_data && skinny_metadata) { |
5683 | key.type = BTRFS_METADATA_ITEM_KEY; | |
5684 | key.offset = owner_objectid; | |
5685 | } | |
5686 | ||
31840ae1 ZY |
5687 | ret = btrfs_search_slot(trans, extent_root, |
5688 | &key, path, -1, 1); | |
3173a18f JB |
5689 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
5690 | /* | |
5691 | * Couldn't find our skinny metadata item, | |
5692 | * see if we have ye olde extent item. | |
5693 | */ | |
5694 | path->slots[0]--; | |
5695 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
5696 | path->slots[0]); | |
5697 | if (key.objectid == bytenr && | |
5698 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
5699 | key.offset == num_bytes) | |
5700 | ret = 0; | |
5701 | } | |
5702 | ||
5703 | if (ret > 0 && skinny_metadata) { | |
5704 | skinny_metadata = false; | |
5705 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5706 | key.offset = num_bytes; | |
5707 | btrfs_release_path(path); | |
5708 | ret = btrfs_search_slot(trans, extent_root, | |
5709 | &key, path, -1, 1); | |
5710 | } | |
5711 | ||
f3465ca4 | 5712 | if (ret) { |
c2cf52eb SK |
5713 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5714 | ret, (unsigned long long)bytenr); | |
b783e62d JB |
5715 | if (ret > 0) |
5716 | btrfs_print_leaf(extent_root, | |
5717 | path->nodes[0]); | |
f3465ca4 | 5718 | } |
005d6427 DS |
5719 | if (ret < 0) { |
5720 | btrfs_abort_transaction(trans, extent_root, ret); | |
5721 | goto out; | |
5722 | } | |
31840ae1 ZY |
5723 | extent_slot = path->slots[0]; |
5724 | } | |
79787eaa | 5725 | } else if (ret == -ENOENT) { |
7bb86316 CM |
5726 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5727 | WARN_ON(1); | |
c2cf52eb SK |
5728 | btrfs_err(info, |
5729 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
5730 | (unsigned long long)bytenr, | |
5731 | (unsigned long long)parent, | |
5732 | (unsigned long long)root_objectid, | |
5733 | (unsigned long long)owner_objectid, | |
5734 | (unsigned long long)owner_offset); | |
79787eaa | 5735 | } else { |
005d6427 DS |
5736 | btrfs_abort_transaction(trans, extent_root, ret); |
5737 | goto out; | |
7bb86316 | 5738 | } |
5f39d397 CM |
5739 | |
5740 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5741 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5742 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5743 | if (item_size < sizeof(*ei)) { | |
5744 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5745 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5746 | owner_objectid, 0); | |
005d6427 DS |
5747 | if (ret < 0) { |
5748 | btrfs_abort_transaction(trans, extent_root, ret); | |
5749 | goto out; | |
5750 | } | |
5d4f98a2 | 5751 | |
b3b4aa74 | 5752 | btrfs_release_path(path); |
5d4f98a2 YZ |
5753 | path->leave_spinning = 1; |
5754 | ||
5755 | key.objectid = bytenr; | |
5756 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5757 | key.offset = num_bytes; | |
5758 | ||
5759 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5760 | -1, 1); | |
5761 | if (ret) { | |
c2cf52eb SK |
5762 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
5763 | ret, (unsigned long long)bytenr); | |
5d4f98a2 YZ |
5764 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5765 | } | |
005d6427 DS |
5766 | if (ret < 0) { |
5767 | btrfs_abort_transaction(trans, extent_root, ret); | |
5768 | goto out; | |
5769 | } | |
5770 | ||
5d4f98a2 YZ |
5771 | extent_slot = path->slots[0]; |
5772 | leaf = path->nodes[0]; | |
5773 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5774 | } | |
5775 | #endif | |
5776 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5777 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5778 | struct btrfs_extent_item); |
3173a18f JB |
5779 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
5780 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
5781 | struct btrfs_tree_block_info *bi; |
5782 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5783 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5784 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5785 | } | |
56bec294 | 5786 | |
5d4f98a2 | 5787 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
5788 | if (refs < refs_to_drop) { |
5789 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
5790 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); | |
5791 | ret = -EINVAL; | |
5792 | btrfs_abort_transaction(trans, extent_root, ret); | |
5793 | goto out; | |
5794 | } | |
56bec294 | 5795 | refs -= refs_to_drop; |
5f39d397 | 5796 | |
5d4f98a2 YZ |
5797 | if (refs > 0) { |
5798 | if (extent_op) | |
5799 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5800 | /* | |
5801 | * In the case of inline back ref, reference count will | |
5802 | * be updated by remove_extent_backref | |
952fccac | 5803 | */ |
5d4f98a2 YZ |
5804 | if (iref) { |
5805 | BUG_ON(!found_extent); | |
5806 | } else { | |
5807 | btrfs_set_extent_refs(leaf, ei, refs); | |
5808 | btrfs_mark_buffer_dirty(leaf); | |
5809 | } | |
5810 | if (found_extent) { | |
5811 | ret = remove_extent_backref(trans, extent_root, path, | |
5812 | iref, refs_to_drop, | |
5813 | is_data); | |
005d6427 DS |
5814 | if (ret) { |
5815 | btrfs_abort_transaction(trans, extent_root, ret); | |
5816 | goto out; | |
5817 | } | |
952fccac | 5818 | } |
b150a4f1 JB |
5819 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
5820 | root_objectid); | |
5d4f98a2 | 5821 | } else { |
5d4f98a2 YZ |
5822 | if (found_extent) { |
5823 | BUG_ON(is_data && refs_to_drop != | |
5824 | extent_data_ref_count(root, path, iref)); | |
5825 | if (iref) { | |
5826 | BUG_ON(path->slots[0] != extent_slot); | |
5827 | } else { | |
5828 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5829 | path->slots[0] = extent_slot; | |
5830 | num_to_del = 2; | |
5831 | } | |
78fae27e | 5832 | } |
b9473439 | 5833 | |
952fccac CM |
5834 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5835 | num_to_del); | |
005d6427 DS |
5836 | if (ret) { |
5837 | btrfs_abort_transaction(trans, extent_root, ret); | |
5838 | goto out; | |
5839 | } | |
b3b4aa74 | 5840 | btrfs_release_path(path); |
21af804c | 5841 | |
5d4f98a2 | 5842 | if (is_data) { |
459931ec | 5843 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5844 | if (ret) { |
5845 | btrfs_abort_transaction(trans, extent_root, ret); | |
5846 | goto out; | |
5847 | } | |
459931ec CM |
5848 | } |
5849 | ||
c53d613e | 5850 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5851 | if (ret) { |
5852 | btrfs_abort_transaction(trans, extent_root, ret); | |
5853 | goto out; | |
5854 | } | |
a28ec197 | 5855 | } |
79787eaa | 5856 | out: |
5caf2a00 | 5857 | btrfs_free_path(path); |
a28ec197 CM |
5858 | return ret; |
5859 | } | |
5860 | ||
1887be66 | 5861 | /* |
f0486c68 | 5862 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5863 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5864 | * a given extent, and if there are no other delayed refs to be processed, it | |
5865 | * removes it from the tree. | |
5866 | */ | |
5867 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5868 | struct btrfs_root *root, u64 bytenr) | |
5869 | { | |
5870 | struct btrfs_delayed_ref_head *head; | |
5871 | struct btrfs_delayed_ref_root *delayed_refs; | |
5872 | struct btrfs_delayed_ref_node *ref; | |
5873 | struct rb_node *node; | |
f0486c68 | 5874 | int ret = 0; |
1887be66 CM |
5875 | |
5876 | delayed_refs = &trans->transaction->delayed_refs; | |
5877 | spin_lock(&delayed_refs->lock); | |
5878 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5879 | if (!head) | |
5880 | goto out; | |
5881 | ||
5882 | node = rb_prev(&head->node.rb_node); | |
5883 | if (!node) | |
5884 | goto out; | |
5885 | ||
5886 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
5887 | ||
5888 | /* there are still entries for this ref, we can't drop it */ | |
5889 | if (ref->bytenr == bytenr) | |
5890 | goto out; | |
5891 | ||
5d4f98a2 YZ |
5892 | if (head->extent_op) { |
5893 | if (!head->must_insert_reserved) | |
5894 | goto out; | |
78a6184a | 5895 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5896 | head->extent_op = NULL; |
5897 | } | |
5898 | ||
1887be66 CM |
5899 | /* |
5900 | * waiting for the lock here would deadlock. If someone else has it | |
5901 | * locked they are already in the process of dropping it anyway | |
5902 | */ | |
5903 | if (!mutex_trylock(&head->mutex)) | |
5904 | goto out; | |
5905 | ||
5906 | /* | |
5907 | * at this point we have a head with no other entries. Go | |
5908 | * ahead and process it. | |
5909 | */ | |
5910 | head->node.in_tree = 0; | |
5911 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 5912 | |
1887be66 CM |
5913 | delayed_refs->num_entries--; |
5914 | ||
5915 | /* | |
5916 | * we don't take a ref on the node because we're removing it from the | |
5917 | * tree, so we just steal the ref the tree was holding. | |
5918 | */ | |
c3e69d58 CM |
5919 | delayed_refs->num_heads--; |
5920 | if (list_empty(&head->cluster)) | |
5921 | delayed_refs->num_heads_ready--; | |
5922 | ||
5923 | list_del_init(&head->cluster); | |
1887be66 CM |
5924 | spin_unlock(&delayed_refs->lock); |
5925 | ||
f0486c68 YZ |
5926 | BUG_ON(head->extent_op); |
5927 | if (head->must_insert_reserved) | |
5928 | ret = 1; | |
5929 | ||
5930 | mutex_unlock(&head->mutex); | |
1887be66 | 5931 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5932 | return ret; |
1887be66 CM |
5933 | out: |
5934 | spin_unlock(&delayed_refs->lock); | |
5935 | return 0; | |
5936 | } | |
5937 | ||
f0486c68 YZ |
5938 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5939 | struct btrfs_root *root, | |
5940 | struct extent_buffer *buf, | |
5581a51a | 5941 | u64 parent, int last_ref) |
f0486c68 | 5942 | { |
f0486c68 | 5943 | struct btrfs_block_group_cache *cache = NULL; |
b150a4f1 | 5944 | int pin = 1; |
f0486c68 YZ |
5945 | int ret; |
5946 | ||
5947 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5948 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5949 | buf->start, buf->len, | |
5950 | parent, root->root_key.objectid, | |
5951 | btrfs_header_level(buf), | |
5581a51a | 5952 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5953 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5954 | } |
5955 | ||
5956 | if (!last_ref) | |
5957 | return; | |
5958 | ||
f0486c68 | 5959 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5960 | |
5961 | if (btrfs_header_generation(buf) == trans->transid) { | |
5962 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5963 | ret = check_ref_cleanup(trans, root, buf->start); | |
5964 | if (!ret) | |
37be25bc | 5965 | goto out; |
f0486c68 YZ |
5966 | } |
5967 | ||
5968 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5969 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5970 | goto out; |
f0486c68 YZ |
5971 | } |
5972 | ||
5973 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5974 | ||
5975 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5976 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
b150a4f1 | 5977 | pin = 0; |
f0486c68 YZ |
5978 | } |
5979 | out: | |
b150a4f1 JB |
5980 | if (pin) |
5981 | add_pinned_bytes(root->fs_info, buf->len, | |
5982 | btrfs_header_level(buf), | |
5983 | root->root_key.objectid); | |
5984 | ||
a826d6dc JB |
5985 | /* |
5986 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5987 | * anymore. | |
5988 | */ | |
5989 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
5990 | btrfs_put_block_group(cache); |
5991 | } | |
5992 | ||
79787eaa | 5993 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
5994 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5995 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
5996 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
5997 | { |
5998 | int ret; | |
66d7e7f0 | 5999 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 6000 | |
b150a4f1 JB |
6001 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
6002 | ||
56bec294 CM |
6003 | /* |
6004 | * tree log blocks never actually go into the extent allocation | |
6005 | * tree, just update pinning info and exit early. | |
56bec294 | 6006 | */ |
5d4f98a2 YZ |
6007 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
6008 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 6009 | /* unlocks the pinned mutex */ |
11833d66 | 6010 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 6011 | ret = 0; |
5d4f98a2 | 6012 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
6013 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
6014 | num_bytes, | |
5d4f98a2 | 6015 | parent, root_objectid, (int)owner, |
66d7e7f0 | 6016 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 6017 | } else { |
66d7e7f0 AJ |
6018 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
6019 | num_bytes, | |
6020 | parent, root_objectid, owner, | |
6021 | offset, BTRFS_DROP_DELAYED_REF, | |
6022 | NULL, for_cow); | |
56bec294 | 6023 | } |
925baedd CM |
6024 | return ret; |
6025 | } | |
6026 | ||
53b381b3 DW |
6027 | static u64 stripe_align(struct btrfs_root *root, |
6028 | struct btrfs_block_group_cache *cache, | |
6029 | u64 val, u64 num_bytes) | |
87ee04eb | 6030 | { |
fda2832f | 6031 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
6032 | return ret; |
6033 | } | |
6034 | ||
817d52f8 JB |
6035 | /* |
6036 | * when we wait for progress in the block group caching, its because | |
6037 | * our allocation attempt failed at least once. So, we must sleep | |
6038 | * and let some progress happen before we try again. | |
6039 | * | |
6040 | * This function will sleep at least once waiting for new free space to | |
6041 | * show up, and then it will check the block group free space numbers | |
6042 | * for our min num_bytes. Another option is to have it go ahead | |
6043 | * and look in the rbtree for a free extent of a given size, but this | |
6044 | * is a good start. | |
36cce922 JB |
6045 | * |
6046 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
6047 | * any of the information in this block group. | |
817d52f8 | 6048 | */ |
36cce922 | 6049 | static noinline void |
817d52f8 JB |
6050 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
6051 | u64 num_bytes) | |
6052 | { | |
11833d66 | 6053 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 6054 | |
11833d66 YZ |
6055 | caching_ctl = get_caching_control(cache); |
6056 | if (!caching_ctl) | |
36cce922 | 6057 | return; |
817d52f8 | 6058 | |
11833d66 | 6059 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 6060 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
6061 | |
6062 | put_caching_control(caching_ctl); | |
11833d66 YZ |
6063 | } |
6064 | ||
6065 | static noinline int | |
6066 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6067 | { | |
6068 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 6069 | int ret = 0; |
11833d66 YZ |
6070 | |
6071 | caching_ctl = get_caching_control(cache); | |
6072 | if (!caching_ctl) | |
36cce922 | 6073 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
6074 | |
6075 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
6076 | if (cache->cached == BTRFS_CACHE_ERROR) |
6077 | ret = -EIO; | |
11833d66 | 6078 | put_caching_control(caching_ctl); |
36cce922 | 6079 | return ret; |
817d52f8 JB |
6080 | } |
6081 | ||
31e50229 | 6082 | int __get_raid_index(u64 flags) |
b742bb82 | 6083 | { |
7738a53a | 6084 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 6085 | return BTRFS_RAID_RAID10; |
7738a53a | 6086 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 6087 | return BTRFS_RAID_RAID1; |
7738a53a | 6088 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 6089 | return BTRFS_RAID_DUP; |
7738a53a | 6090 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 6091 | return BTRFS_RAID_RAID0; |
53b381b3 | 6092 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 6093 | return BTRFS_RAID_RAID5; |
53b381b3 | 6094 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 6095 | return BTRFS_RAID_RAID6; |
7738a53a | 6096 | |
e942f883 | 6097 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
6098 | } |
6099 | ||
7738a53a ID |
6100 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
6101 | { | |
31e50229 | 6102 | return __get_raid_index(cache->flags); |
7738a53a ID |
6103 | } |
6104 | ||
817d52f8 | 6105 | enum btrfs_loop_type { |
285ff5af JB |
6106 | LOOP_CACHING_NOWAIT = 0, |
6107 | LOOP_CACHING_WAIT = 1, | |
6108 | LOOP_ALLOC_CHUNK = 2, | |
6109 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
6110 | }; |
6111 | ||
fec577fb CM |
6112 | /* |
6113 | * walks the btree of allocated extents and find a hole of a given size. | |
6114 | * The key ins is changed to record the hole: | |
6115 | * ins->objectid == block start | |
62e2749e | 6116 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
6117 | * ins->offset == number of blocks |
6118 | * Any available blocks before search_start are skipped. | |
6119 | */ | |
d397712b | 6120 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
6121 | struct btrfs_root *orig_root, |
6122 | u64 num_bytes, u64 empty_size, | |
98ed5174 | 6123 | u64 hint_byte, struct btrfs_key *ins, |
b6919a58 | 6124 | u64 flags) |
fec577fb | 6125 | { |
80eb234a | 6126 | int ret = 0; |
d397712b | 6127 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 6128 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 6129 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 6130 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 6131 | u64 search_start = 0; |
239b14b3 | 6132 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 6133 | struct btrfs_space_info *space_info; |
fa9c0d79 | 6134 | int loop = 0; |
b6919a58 DS |
6135 | int index = __get_raid_index(flags); |
6136 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
fb25e914 | 6137 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
817d52f8 | 6138 | bool found_uncached_bg = false; |
0a24325e | 6139 | bool failed_cluster_refill = false; |
1cdda9b8 | 6140 | bool failed_alloc = false; |
67377734 | 6141 | bool use_cluster = true; |
60d2adbb | 6142 | bool have_caching_bg = false; |
fec577fb | 6143 | |
db94535d | 6144 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 6145 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
6146 | ins->objectid = 0; |
6147 | ins->offset = 0; | |
b1a4d965 | 6148 | |
b6919a58 | 6149 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
3f7de037 | 6150 | |
b6919a58 | 6151 | space_info = __find_space_info(root->fs_info, flags); |
1b1d1f66 | 6152 | if (!space_info) { |
b6919a58 | 6153 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
6154 | return -ENOSPC; |
6155 | } | |
2552d17e | 6156 | |
67377734 JB |
6157 | /* |
6158 | * If the space info is for both data and metadata it means we have a | |
6159 | * small filesystem and we can't use the clustering stuff. | |
6160 | */ | |
6161 | if (btrfs_mixed_space_info(space_info)) | |
6162 | use_cluster = false; | |
6163 | ||
b6919a58 | 6164 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 6165 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
6166 | if (!btrfs_test_opt(root, SSD)) |
6167 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
6168 | } |
6169 | ||
b6919a58 | 6170 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
67377734 | 6171 | btrfs_test_opt(root, SSD)) { |
fa9c0d79 CM |
6172 | last_ptr = &root->fs_info->data_alloc_cluster; |
6173 | } | |
0f9dd46c | 6174 | |
239b14b3 | 6175 | if (last_ptr) { |
fa9c0d79 CM |
6176 | spin_lock(&last_ptr->lock); |
6177 | if (last_ptr->block_group) | |
6178 | hint_byte = last_ptr->window_start; | |
6179 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 6180 | } |
fa9c0d79 | 6181 | |
a061fc8d | 6182 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 6183 | search_start = max(search_start, hint_byte); |
0b86a832 | 6184 | |
817d52f8 | 6185 | if (!last_ptr) |
fa9c0d79 | 6186 | empty_cluster = 0; |
fa9c0d79 | 6187 | |
2552d17e | 6188 | if (search_start == hint_byte) { |
2552d17e JB |
6189 | block_group = btrfs_lookup_block_group(root->fs_info, |
6190 | search_start); | |
274bd4fb | 6191 | used_block_group = block_group; |
817d52f8 JB |
6192 | /* |
6193 | * we don't want to use the block group if it doesn't match our | |
6194 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
6195 | * |
6196 | * However if we are re-searching with an ideal block group | |
6197 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 6198 | */ |
b6919a58 | 6199 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 6200 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6201 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6202 | if (list_empty(&block_group->list) || |
6203 | block_group->ro) { | |
6204 | /* | |
6205 | * someone is removing this block group, | |
6206 | * we can't jump into the have_block_group | |
6207 | * target because our list pointers are not | |
6208 | * valid | |
6209 | */ | |
6210 | btrfs_put_block_group(block_group); | |
6211 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6212 | } else { |
b742bb82 | 6213 | index = get_block_group_index(block_group); |
44fb5511 | 6214 | goto have_block_group; |
ccf0e725 | 6215 | } |
2552d17e | 6216 | } else if (block_group) { |
fa9c0d79 | 6217 | btrfs_put_block_group(block_group); |
2552d17e | 6218 | } |
42e70e7a | 6219 | } |
2552d17e | 6220 | search: |
60d2adbb | 6221 | have_caching_bg = false; |
80eb234a | 6222 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6223 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6224 | list) { | |
6226cb0a | 6225 | u64 offset; |
817d52f8 | 6226 | int cached; |
8a1413a2 | 6227 | |
274bd4fb | 6228 | used_block_group = block_group; |
11dfe35a | 6229 | btrfs_get_block_group(block_group); |
2552d17e | 6230 | search_start = block_group->key.objectid; |
42e70e7a | 6231 | |
83a50de9 CM |
6232 | /* |
6233 | * this can happen if we end up cycling through all the | |
6234 | * raid types, but we want to make sure we only allocate | |
6235 | * for the proper type. | |
6236 | */ | |
b6919a58 | 6237 | if (!block_group_bits(block_group, flags)) { |
83a50de9 CM |
6238 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
6239 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6240 | BTRFS_BLOCK_GROUP_RAID5 | |
6241 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6242 | BTRFS_BLOCK_GROUP_RAID10; |
6243 | ||
6244 | /* | |
6245 | * if they asked for extra copies and this block group | |
6246 | * doesn't provide them, bail. This does allow us to | |
6247 | * fill raid0 from raid1. | |
6248 | */ | |
b6919a58 | 6249 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
6250 | goto loop; |
6251 | } | |
6252 | ||
2552d17e | 6253 | have_block_group: |
291c7d2f JB |
6254 | cached = block_group_cache_done(block_group); |
6255 | if (unlikely(!cached)) { | |
291c7d2f | 6256 | found_uncached_bg = true; |
f6373bf3 | 6257 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6258 | BUG_ON(ret < 0); |
6259 | ret = 0; | |
817d52f8 JB |
6260 | } |
6261 | ||
36cce922 JB |
6262 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
6263 | goto loop; | |
ea6a478e | 6264 | if (unlikely(block_group->ro)) |
2552d17e | 6265 | goto loop; |
0f9dd46c | 6266 | |
0a24325e | 6267 | /* |
062c05c4 AO |
6268 | * Ok we want to try and use the cluster allocator, so |
6269 | * lets look there | |
0a24325e | 6270 | */ |
062c05c4 | 6271 | if (last_ptr) { |
8de972b4 | 6272 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6273 | /* |
6274 | * the refill lock keeps out other | |
6275 | * people trying to start a new cluster | |
6276 | */ | |
6277 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
6278 | used_block_group = last_ptr->block_group; |
6279 | if (used_block_group != block_group && | |
6280 | (!used_block_group || | |
6281 | used_block_group->ro || | |
b6919a58 | 6282 | !block_group_bits(used_block_group, flags))) { |
274bd4fb | 6283 | used_block_group = block_group; |
44fb5511 | 6284 | goto refill_cluster; |
274bd4fb AO |
6285 | } |
6286 | ||
6287 | if (used_block_group != block_group) | |
6288 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 6289 | |
274bd4fb AO |
6290 | offset = btrfs_alloc_from_cluster(used_block_group, |
6291 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
6292 | if (offset) { |
6293 | /* we have a block, we're done */ | |
6294 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6295 | trace_btrfs_reserve_extent_cluster(root, |
6296 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
6297 | goto checks; |
6298 | } | |
6299 | ||
274bd4fb AO |
6300 | WARN_ON(last_ptr->block_group != used_block_group); |
6301 | if (used_block_group != block_group) { | |
6302 | btrfs_put_block_group(used_block_group); | |
6303 | used_block_group = block_group; | |
fa9c0d79 | 6304 | } |
44fb5511 | 6305 | refill_cluster: |
274bd4fb | 6306 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
6307 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
6308 | * set up a new clusters, so lets just skip it | |
6309 | * and let the allocator find whatever block | |
6310 | * it can find. If we reach this point, we | |
6311 | * will have tried the cluster allocator | |
6312 | * plenty of times and not have found | |
6313 | * anything, so we are likely way too | |
6314 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
6315 | * anything. |
6316 | * | |
6317 | * However, if the cluster is taken from the | |
6318 | * current block group, release the cluster | |
6319 | * first, so that we stand a better chance of | |
6320 | * succeeding in the unclustered | |
6321 | * allocation. */ | |
6322 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6323 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
6324 | spin_unlock(&last_ptr->refill_lock); |
6325 | goto unclustered_alloc; | |
6326 | } | |
6327 | ||
fa9c0d79 CM |
6328 | /* |
6329 | * this cluster didn't work out, free it and | |
6330 | * start over | |
6331 | */ | |
6332 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6333 | ||
a5f6f719 AO |
6334 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
6335 | spin_unlock(&last_ptr->refill_lock); | |
6336 | goto unclustered_alloc; | |
6337 | } | |
6338 | ||
8de972b4 CM |
6339 | aligned_cluster = max_t(unsigned long, |
6340 | empty_cluster + empty_size, | |
6341 | block_group->full_stripe_len); | |
6342 | ||
fa9c0d79 | 6343 | /* allocate a cluster in this block group */ |
451d7585 | 6344 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 6345 | block_group, last_ptr, |
1b22bad7 | 6346 | search_start, num_bytes, |
8de972b4 | 6347 | aligned_cluster); |
fa9c0d79 CM |
6348 | if (ret == 0) { |
6349 | /* | |
6350 | * now pull our allocation out of this | |
6351 | * cluster | |
6352 | */ | |
6353 | offset = btrfs_alloc_from_cluster(block_group, | |
6354 | last_ptr, num_bytes, | |
6355 | search_start); | |
6356 | if (offset) { | |
6357 | /* we found one, proceed */ | |
6358 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6359 | trace_btrfs_reserve_extent_cluster(root, |
6360 | block_group, search_start, | |
6361 | num_bytes); | |
fa9c0d79 CM |
6362 | goto checks; |
6363 | } | |
0a24325e JB |
6364 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6365 | && !failed_cluster_refill) { | |
817d52f8 JB |
6366 | spin_unlock(&last_ptr->refill_lock); |
6367 | ||
0a24325e | 6368 | failed_cluster_refill = true; |
817d52f8 JB |
6369 | wait_block_group_cache_progress(block_group, |
6370 | num_bytes + empty_cluster + empty_size); | |
6371 | goto have_block_group; | |
fa9c0d79 | 6372 | } |
817d52f8 | 6373 | |
fa9c0d79 CM |
6374 | /* |
6375 | * at this point we either didn't find a cluster | |
6376 | * or we weren't able to allocate a block from our | |
6377 | * cluster. Free the cluster we've been trying | |
6378 | * to use, and go to the next block group | |
6379 | */ | |
0a24325e | 6380 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6381 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6382 | goto loop; |
fa9c0d79 CM |
6383 | } |
6384 | ||
062c05c4 | 6385 | unclustered_alloc: |
a5f6f719 AO |
6386 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6387 | if (cached && | |
6388 | block_group->free_space_ctl->free_space < | |
6389 | num_bytes + empty_cluster + empty_size) { | |
6390 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6391 | goto loop; | |
6392 | } | |
6393 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6394 | ||
6226cb0a JB |
6395 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
6396 | num_bytes, empty_size); | |
1cdda9b8 JB |
6397 | /* |
6398 | * If we didn't find a chunk, and we haven't failed on this | |
6399 | * block group before, and this block group is in the middle of | |
6400 | * caching and we are ok with waiting, then go ahead and wait | |
6401 | * for progress to be made, and set failed_alloc to true. | |
6402 | * | |
6403 | * If failed_alloc is true then we've already waited on this | |
6404 | * block group once and should move on to the next block group. | |
6405 | */ | |
6406 | if (!offset && !failed_alloc && !cached && | |
6407 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6408 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6409 | num_bytes + empty_size); |
6410 | failed_alloc = true; | |
817d52f8 | 6411 | goto have_block_group; |
1cdda9b8 | 6412 | } else if (!offset) { |
60d2adbb MX |
6413 | if (!cached) |
6414 | have_caching_bg = true; | |
1cdda9b8 | 6415 | goto loop; |
817d52f8 | 6416 | } |
fa9c0d79 | 6417 | checks: |
53b381b3 DW |
6418 | search_start = stripe_align(root, used_block_group, |
6419 | offset, num_bytes); | |
25179201 | 6420 | |
2552d17e JB |
6421 | /* move on to the next group */ |
6422 | if (search_start + num_bytes > | |
274bd4fb AO |
6423 | used_block_group->key.objectid + used_block_group->key.offset) { |
6424 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 6425 | goto loop; |
6226cb0a | 6426 | } |
f5a31e16 | 6427 | |
f0486c68 | 6428 | if (offset < search_start) |
274bd4fb | 6429 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
6430 | search_start - offset); |
6431 | BUG_ON(offset > search_start); | |
2552d17e | 6432 | |
274bd4fb | 6433 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 6434 | alloc_type); |
f0486c68 | 6435 | if (ret == -EAGAIN) { |
274bd4fb | 6436 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 6437 | goto loop; |
0f9dd46c | 6438 | } |
0b86a832 | 6439 | |
f0486c68 | 6440 | /* we are all good, lets return */ |
2552d17e JB |
6441 | ins->objectid = search_start; |
6442 | ins->offset = num_bytes; | |
d2fb3437 | 6443 | |
3f7de037 JB |
6444 | trace_btrfs_reserve_extent(orig_root, block_group, |
6445 | search_start, num_bytes); | |
274bd4fb AO |
6446 | if (used_block_group != block_group) |
6447 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 6448 | btrfs_put_block_group(block_group); |
2552d17e JB |
6449 | break; |
6450 | loop: | |
0a24325e | 6451 | failed_cluster_refill = false; |
1cdda9b8 | 6452 | failed_alloc = false; |
b742bb82 | 6453 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
6454 | if (used_block_group != block_group) |
6455 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 6456 | btrfs_put_block_group(block_group); |
2552d17e JB |
6457 | } |
6458 | up_read(&space_info->groups_sem); | |
6459 | ||
60d2adbb MX |
6460 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6461 | goto search; | |
6462 | ||
b742bb82 YZ |
6463 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6464 | goto search; | |
6465 | ||
285ff5af | 6466 | /* |
ccf0e725 JB |
6467 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6468 | * caching kthreads as we move along | |
817d52f8 JB |
6469 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6470 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6471 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6472 | * again | |
fa9c0d79 | 6473 | */ |
723bda20 | 6474 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6475 | index = 0; |
723bda20 | 6476 | loop++; |
817d52f8 | 6477 | if (loop == LOOP_ALLOC_CHUNK) { |
b6919a58 | 6478 | ret = do_chunk_alloc(trans, root, flags, |
ea658bad JB |
6479 | CHUNK_ALLOC_FORCE); |
6480 | /* | |
6481 | * Do not bail out on ENOSPC since we | |
6482 | * can do more things. | |
6483 | */ | |
6484 | if (ret < 0 && ret != -ENOSPC) { | |
6485 | btrfs_abort_transaction(trans, | |
6486 | root, ret); | |
6487 | goto out; | |
723bda20 | 6488 | } |
2552d17e JB |
6489 | } |
6490 | ||
723bda20 JB |
6491 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6492 | empty_size = 0; | |
6493 | empty_cluster = 0; | |
fa9c0d79 | 6494 | } |
723bda20 JB |
6495 | |
6496 | goto search; | |
2552d17e JB |
6497 | } else if (!ins->objectid) { |
6498 | ret = -ENOSPC; | |
d82a6f1d | 6499 | } else if (ins->objectid) { |
80eb234a | 6500 | ret = 0; |
be744175 | 6501 | } |
79787eaa | 6502 | out: |
be744175 | 6503 | |
0f70abe2 | 6504 | return ret; |
fec577fb | 6505 | } |
ec44a35c | 6506 | |
9ed74f2d JB |
6507 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6508 | int dump_block_groups) | |
0f9dd46c JB |
6509 | { |
6510 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6511 | int index = 0; |
0f9dd46c | 6512 | |
9ed74f2d | 6513 | spin_lock(&info->lock); |
fb25e914 JB |
6514 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
6515 | (unsigned long long)info->flags, | |
d397712b | 6516 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 6517 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 6518 | info->bytes_readonly), |
d397712b | 6519 | (info->full) ? "" : "not "); |
8929ecfa YZ |
6520 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
6521 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 6522 | (unsigned long long)info->total_bytes, |
8929ecfa | 6523 | (unsigned long long)info->bytes_used, |
21380931 | 6524 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 6525 | (unsigned long long)info->bytes_reserved, |
21380931 | 6526 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 6527 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
6528 | spin_unlock(&info->lock); |
6529 | ||
6530 | if (!dump_block_groups) | |
6531 | return; | |
0f9dd46c | 6532 | |
80eb234a | 6533 | down_read(&info->groups_sem); |
b742bb82 YZ |
6534 | again: |
6535 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6536 | spin_lock(&cache->lock); |
799ffc3c | 6537 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
d397712b CM |
6538 | (unsigned long long)cache->key.objectid, |
6539 | (unsigned long long)cache->key.offset, | |
6540 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
6541 | (unsigned long long)cache->pinned, | |
799ffc3c LB |
6542 | (unsigned long long)cache->reserved, |
6543 | cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6544 | btrfs_dump_free_space(cache, bytes); |
6545 | spin_unlock(&cache->lock); | |
6546 | } | |
b742bb82 YZ |
6547 | if (++index < BTRFS_NR_RAID_TYPES) |
6548 | goto again; | |
80eb234a | 6549 | up_read(&info->groups_sem); |
0f9dd46c | 6550 | } |
e8569813 | 6551 | |
11833d66 YZ |
6552 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
6553 | struct btrfs_root *root, | |
6554 | u64 num_bytes, u64 min_alloc_size, | |
6555 | u64 empty_size, u64 hint_byte, | |
b6919a58 | 6556 | struct btrfs_key *ins, int is_data) |
fec577fb | 6557 | { |
9e622d6b | 6558 | bool final_tried = false; |
b6919a58 | 6559 | u64 flags; |
fec577fb | 6560 | int ret; |
925baedd | 6561 | |
b6919a58 | 6562 | flags = btrfs_get_alloc_profile(root, is_data); |
98d20f67 | 6563 | again: |
db94535d CM |
6564 | WARN_ON(num_bytes < root->sectorsize); |
6565 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
b6919a58 | 6566 | hint_byte, ins, flags); |
3b951516 | 6567 | |
9e622d6b MX |
6568 | if (ret == -ENOSPC) { |
6569 | if (!final_tried) { | |
6570 | num_bytes = num_bytes >> 1; | |
24542bf7 | 6571 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6572 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6573 | if (num_bytes == min_alloc_size) |
6574 | final_tried = true; | |
6575 | goto again; | |
6576 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6577 | struct btrfs_space_info *sinfo; | |
6578 | ||
b6919a58 | 6579 | sinfo = __find_space_info(root->fs_info, flags); |
c2cf52eb | 6580 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
b6919a58 | 6581 | (unsigned long long)flags, |
c2cf52eb | 6582 | (unsigned long long)num_bytes); |
53804280 JM |
6583 | if (sinfo) |
6584 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6585 | } |
925baedd | 6586 | } |
0f9dd46c | 6587 | |
1abe9b8a | 6588 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
6589 | ||
0f9dd46c | 6590 | return ret; |
e6dcd2dc CM |
6591 | } |
6592 | ||
e688b725 CM |
6593 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6594 | u64 start, u64 len, int pin) | |
65b51a00 | 6595 | { |
0f9dd46c | 6596 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6597 | int ret = 0; |
0f9dd46c | 6598 | |
0f9dd46c JB |
6599 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6600 | if (!cache) { | |
c2cf52eb SK |
6601 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
6602 | (unsigned long long)start); | |
0f9dd46c JB |
6603 | return -ENOSPC; |
6604 | } | |
1f3c79a2 | 6605 | |
5378e607 LD |
6606 | if (btrfs_test_opt(root, DISCARD)) |
6607 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6608 | |
e688b725 CM |
6609 | if (pin) |
6610 | pin_down_extent(root, cache, start, len, 1); | |
6611 | else { | |
6612 | btrfs_add_free_space(cache, start, len); | |
6613 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6614 | } | |
fa9c0d79 | 6615 | btrfs_put_block_group(cache); |
817d52f8 | 6616 | |
1abe9b8a | 6617 | trace_btrfs_reserved_extent_free(root, start, len); |
6618 | ||
e6dcd2dc CM |
6619 | return ret; |
6620 | } | |
6621 | ||
e688b725 CM |
6622 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6623 | u64 start, u64 len) | |
6624 | { | |
6625 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6626 | } | |
6627 | ||
6628 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6629 | u64 start, u64 len) | |
6630 | { | |
6631 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6632 | } | |
6633 | ||
5d4f98a2 YZ |
6634 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6635 | struct btrfs_root *root, | |
6636 | u64 parent, u64 root_objectid, | |
6637 | u64 flags, u64 owner, u64 offset, | |
6638 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6639 | { |
6640 | int ret; | |
5d4f98a2 | 6641 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6642 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6643 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6644 | struct btrfs_path *path; |
5d4f98a2 YZ |
6645 | struct extent_buffer *leaf; |
6646 | int type; | |
6647 | u32 size; | |
26b8003f | 6648 | |
5d4f98a2 YZ |
6649 | if (parent > 0) |
6650 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6651 | else | |
6652 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6653 | |
5d4f98a2 | 6654 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6655 | |
6656 | path = btrfs_alloc_path(); | |
db5b493a TI |
6657 | if (!path) |
6658 | return -ENOMEM; | |
47e4bb98 | 6659 | |
b9473439 | 6660 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6661 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6662 | ins, size); | |
79787eaa JM |
6663 | if (ret) { |
6664 | btrfs_free_path(path); | |
6665 | return ret; | |
6666 | } | |
0f9dd46c | 6667 | |
5d4f98a2 YZ |
6668 | leaf = path->nodes[0]; |
6669 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6670 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6671 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6672 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6673 | btrfs_set_extent_flags(leaf, extent_item, | |
6674 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6675 | ||
6676 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6677 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6678 | if (parent > 0) { | |
6679 | struct btrfs_shared_data_ref *ref; | |
6680 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6681 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6682 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6683 | } else { | |
6684 | struct btrfs_extent_data_ref *ref; | |
6685 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6686 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6687 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6688 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6689 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6690 | } | |
47e4bb98 CM |
6691 | |
6692 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6693 | btrfs_free_path(path); |
f510cfec | 6694 | |
c53d613e | 6695 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6696 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6697 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6698 | (unsigned long long)ins->objectid, | |
6699 | (unsigned long long)ins->offset); | |
f5947066 CM |
6700 | BUG(); |
6701 | } | |
e6dcd2dc CM |
6702 | return ret; |
6703 | } | |
6704 | ||
5d4f98a2 YZ |
6705 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6706 | struct btrfs_root *root, | |
6707 | u64 parent, u64 root_objectid, | |
6708 | u64 flags, struct btrfs_disk_key *key, | |
6709 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6710 | { |
6711 | int ret; | |
5d4f98a2 YZ |
6712 | struct btrfs_fs_info *fs_info = root->fs_info; |
6713 | struct btrfs_extent_item *extent_item; | |
6714 | struct btrfs_tree_block_info *block_info; | |
6715 | struct btrfs_extent_inline_ref *iref; | |
6716 | struct btrfs_path *path; | |
6717 | struct extent_buffer *leaf; | |
3173a18f JB |
6718 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
6719 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6720 | SKINNY_METADATA); | |
6721 | ||
6722 | if (!skinny_metadata) | |
6723 | size += sizeof(*block_info); | |
1c2308f8 | 6724 | |
5d4f98a2 | 6725 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6726 | if (!path) |
6727 | return -ENOMEM; | |
56bec294 | 6728 | |
5d4f98a2 YZ |
6729 | path->leave_spinning = 1; |
6730 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6731 | ins, size); | |
79787eaa JM |
6732 | if (ret) { |
6733 | btrfs_free_path(path); | |
6734 | return ret; | |
6735 | } | |
5d4f98a2 YZ |
6736 | |
6737 | leaf = path->nodes[0]; | |
6738 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6739 | struct btrfs_extent_item); | |
6740 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6741 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6742 | btrfs_set_extent_flags(leaf, extent_item, | |
6743 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 6744 | |
3173a18f JB |
6745 | if (skinny_metadata) { |
6746 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6747 | } else { | |
6748 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6749 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6750 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6751 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6752 | } | |
5d4f98a2 | 6753 | |
5d4f98a2 YZ |
6754 | if (parent > 0) { |
6755 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6756 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6757 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6758 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6759 | } else { | |
6760 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6761 | BTRFS_TREE_BLOCK_REF_KEY); | |
6762 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6763 | } | |
6764 | ||
6765 | btrfs_mark_buffer_dirty(leaf); | |
6766 | btrfs_free_path(path); | |
6767 | ||
3173a18f | 6768 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
79787eaa | 6769 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb SK |
6770 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
6771 | (unsigned long long)ins->objectid, | |
6772 | (unsigned long long)ins->offset); | |
5d4f98a2 YZ |
6773 | BUG(); |
6774 | } | |
6775 | return ret; | |
6776 | } | |
6777 | ||
6778 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6779 | struct btrfs_root *root, | |
6780 | u64 root_objectid, u64 owner, | |
6781 | u64 offset, struct btrfs_key *ins) | |
6782 | { | |
6783 | int ret; | |
6784 | ||
6785 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6786 | ||
66d7e7f0 AJ |
6787 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6788 | ins->offset, 0, | |
6789 | root_objectid, owner, offset, | |
6790 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6791 | return ret; |
6792 | } | |
e02119d5 CM |
6793 | |
6794 | /* | |
6795 | * this is used by the tree logging recovery code. It records that | |
6796 | * an extent has been allocated and makes sure to clear the free | |
6797 | * space cache bits as well | |
6798 | */ | |
5d4f98a2 YZ |
6799 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6800 | struct btrfs_root *root, | |
6801 | u64 root_objectid, u64 owner, u64 offset, | |
6802 | struct btrfs_key *ins) | |
e02119d5 CM |
6803 | { |
6804 | int ret; | |
6805 | struct btrfs_block_group_cache *block_group; | |
11833d66 | 6806 | |
8c2a1a30 JB |
6807 | /* |
6808 | * Mixed block groups will exclude before processing the log so we only | |
6809 | * need to do the exlude dance if this fs isn't mixed. | |
6810 | */ | |
6811 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
6812 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
b50c6e25 | 6813 | if (ret) |
8c2a1a30 | 6814 | return ret; |
11833d66 YZ |
6815 | } |
6816 | ||
8c2a1a30 JB |
6817 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
6818 | if (!block_group) | |
6819 | return -EINVAL; | |
6820 | ||
fb25e914 JB |
6821 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6822 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6823 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
6824 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6825 | 0, owner, offset, ins, 1); | |
b50c6e25 | 6826 | btrfs_put_block_group(block_group); |
e02119d5 CM |
6827 | return ret; |
6828 | } | |
6829 | ||
48a3b636 ES |
6830 | static struct extent_buffer * |
6831 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
6832 | u64 bytenr, u32 blocksize, int level) | |
65b51a00 CM |
6833 | { |
6834 | struct extent_buffer *buf; | |
6835 | ||
6836 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6837 | if (!buf) | |
6838 | return ERR_PTR(-ENOMEM); | |
6839 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6840 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6841 | btrfs_tree_lock(buf); |
6842 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6843 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6844 | |
6845 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6846 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6847 | |
d0c803c4 | 6848 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6849 | /* |
6850 | * we allow two log transactions at a time, use different | |
6851 | * EXENT bit to differentiate dirty pages. | |
6852 | */ | |
6853 | if (root->log_transid % 2 == 0) | |
6854 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6855 | buf->start + buf->len - 1, GFP_NOFS); | |
6856 | else | |
6857 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6858 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6859 | } else { |
6860 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6861 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6862 | } |
65b51a00 | 6863 | trans->blocks_used++; |
b4ce94de | 6864 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6865 | return buf; |
6866 | } | |
6867 | ||
f0486c68 YZ |
6868 | static struct btrfs_block_rsv * |
6869 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6870 | struct btrfs_root *root, u32 blocksize) | |
6871 | { | |
6872 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6873 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 | 6874 | int ret; |
d88033db | 6875 | bool global_updated = false; |
f0486c68 YZ |
6876 | |
6877 | block_rsv = get_block_rsv(trans, root); | |
6878 | ||
b586b323 MX |
6879 | if (unlikely(block_rsv->size == 0)) |
6880 | goto try_reserve; | |
d88033db | 6881 | again: |
f0486c68 YZ |
6882 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
6883 | if (!ret) | |
6884 | return block_rsv; | |
6885 | ||
b586b323 MX |
6886 | if (block_rsv->failfast) |
6887 | return ERR_PTR(ret); | |
6888 | ||
d88033db MX |
6889 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
6890 | global_updated = true; | |
6891 | update_global_block_rsv(root->fs_info); | |
6892 | goto again; | |
6893 | } | |
6894 | ||
b586b323 MX |
6895 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6896 | static DEFINE_RATELIMIT_STATE(_rs, | |
6897 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6898 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6899 | if (__ratelimit(&_rs)) | |
6900 | WARN(1, KERN_DEBUG | |
6901 | "btrfs: block rsv returned %d\n", ret); | |
6902 | } | |
6903 | try_reserve: | |
6904 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
6905 | BTRFS_RESERVE_NO_FLUSH); | |
6906 | if (!ret) | |
6907 | return block_rsv; | |
6908 | /* | |
6909 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
6910 | * the global reserve if its space type is the same as the global |
6911 | * reservation. | |
b586b323 | 6912 | */ |
5881cfc9 MX |
6913 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
6914 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
6915 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
6916 | if (!ret) | |
6917 | return global_rsv; | |
6918 | } | |
6919 | return ERR_PTR(ret); | |
f0486c68 YZ |
6920 | } |
6921 | ||
8c2a3ca2 JB |
6922 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6923 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6924 | { |
6925 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6926 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6927 | } |
6928 | ||
fec577fb | 6929 | /* |
f0486c68 YZ |
6930 | * finds a free extent and does all the dirty work required for allocation |
6931 | * returns the key for the extent through ins, and a tree buffer for | |
6932 | * the first block of the extent through buf. | |
6933 | * | |
fec577fb CM |
6934 | * returns the tree buffer or NULL. |
6935 | */ | |
5f39d397 | 6936 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6937 | struct btrfs_root *root, u32 blocksize, |
6938 | u64 parent, u64 root_objectid, | |
6939 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6940 | u64 hint, u64 empty_size) |
fec577fb | 6941 | { |
e2fa7227 | 6942 | struct btrfs_key ins; |
f0486c68 | 6943 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6944 | struct extent_buffer *buf; |
f0486c68 YZ |
6945 | u64 flags = 0; |
6946 | int ret; | |
3173a18f JB |
6947 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6948 | SKINNY_METADATA); | |
fec577fb | 6949 | |
f0486c68 YZ |
6950 | block_rsv = use_block_rsv(trans, root, blocksize); |
6951 | if (IS_ERR(block_rsv)) | |
6952 | return ERR_CAST(block_rsv); | |
6953 | ||
6954 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
81c9ad23 | 6955 | empty_size, hint, &ins, 0); |
fec577fb | 6956 | if (ret) { |
8c2a3ca2 | 6957 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 6958 | return ERR_PTR(ret); |
fec577fb | 6959 | } |
55c69072 | 6960 | |
4008c04a CM |
6961 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6962 | blocksize, level); | |
79787eaa | 6963 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
6964 | |
6965 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6966 | if (parent == 0) | |
6967 | parent = ins.objectid; | |
6968 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6969 | } else | |
6970 | BUG_ON(parent > 0); | |
6971 | ||
6972 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6973 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 6974 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 6975 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
6976 | if (key) |
6977 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6978 | else | |
6979 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6980 | extent_op->flags_to_set = flags; | |
3173a18f JB |
6981 | if (skinny_metadata) |
6982 | extent_op->update_key = 0; | |
6983 | else | |
6984 | extent_op->update_key = 1; | |
f0486c68 YZ |
6985 | extent_op->update_flags = 1; |
6986 | extent_op->is_data = 0; | |
b1c79e09 | 6987 | extent_op->level = level; |
f0486c68 | 6988 | |
66d7e7f0 AJ |
6989 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6990 | ins.objectid, | |
f0486c68 YZ |
6991 | ins.offset, parent, root_objectid, |
6992 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 6993 | extent_op, 0); |
79787eaa | 6994 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 6995 | } |
fec577fb CM |
6996 | return buf; |
6997 | } | |
a28ec197 | 6998 | |
2c47e605 YZ |
6999 | struct walk_control { |
7000 | u64 refs[BTRFS_MAX_LEVEL]; | |
7001 | u64 flags[BTRFS_MAX_LEVEL]; | |
7002 | struct btrfs_key update_progress; | |
7003 | int stage; | |
7004 | int level; | |
7005 | int shared_level; | |
7006 | int update_ref; | |
7007 | int keep_locks; | |
1c4850e2 YZ |
7008 | int reada_slot; |
7009 | int reada_count; | |
66d7e7f0 | 7010 | int for_reloc; |
2c47e605 YZ |
7011 | }; |
7012 | ||
7013 | #define DROP_REFERENCE 1 | |
7014 | #define UPDATE_BACKREF 2 | |
7015 | ||
1c4850e2 YZ |
7016 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
7017 | struct btrfs_root *root, | |
7018 | struct walk_control *wc, | |
7019 | struct btrfs_path *path) | |
6407bf6d | 7020 | { |
1c4850e2 YZ |
7021 | u64 bytenr; |
7022 | u64 generation; | |
7023 | u64 refs; | |
94fcca9f | 7024 | u64 flags; |
5d4f98a2 | 7025 | u32 nritems; |
1c4850e2 YZ |
7026 | u32 blocksize; |
7027 | struct btrfs_key key; | |
7028 | struct extent_buffer *eb; | |
6407bf6d | 7029 | int ret; |
1c4850e2 YZ |
7030 | int slot; |
7031 | int nread = 0; | |
6407bf6d | 7032 | |
1c4850e2 YZ |
7033 | if (path->slots[wc->level] < wc->reada_slot) { |
7034 | wc->reada_count = wc->reada_count * 2 / 3; | |
7035 | wc->reada_count = max(wc->reada_count, 2); | |
7036 | } else { | |
7037 | wc->reada_count = wc->reada_count * 3 / 2; | |
7038 | wc->reada_count = min_t(int, wc->reada_count, | |
7039 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
7040 | } | |
7bb86316 | 7041 | |
1c4850e2 YZ |
7042 | eb = path->nodes[wc->level]; |
7043 | nritems = btrfs_header_nritems(eb); | |
7044 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 7045 | |
1c4850e2 YZ |
7046 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
7047 | if (nread >= wc->reada_count) | |
7048 | break; | |
bd56b302 | 7049 | |
2dd3e67b | 7050 | cond_resched(); |
1c4850e2 YZ |
7051 | bytenr = btrfs_node_blockptr(eb, slot); |
7052 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 7053 | |
1c4850e2 YZ |
7054 | if (slot == path->slots[wc->level]) |
7055 | goto reada; | |
5d4f98a2 | 7056 | |
1c4850e2 YZ |
7057 | if (wc->stage == UPDATE_BACKREF && |
7058 | generation <= root->root_key.offset) | |
bd56b302 CM |
7059 | continue; |
7060 | ||
94fcca9f | 7061 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
7062 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
7063 | wc->level - 1, 1, &refs, | |
7064 | &flags); | |
79787eaa JM |
7065 | /* We don't care about errors in readahead. */ |
7066 | if (ret < 0) | |
7067 | continue; | |
94fcca9f YZ |
7068 | BUG_ON(refs == 0); |
7069 | ||
1c4850e2 | 7070 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
7071 | if (refs == 1) |
7072 | goto reada; | |
bd56b302 | 7073 | |
94fcca9f YZ |
7074 | if (wc->level == 1 && |
7075 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7076 | continue; | |
1c4850e2 YZ |
7077 | if (!wc->update_ref || |
7078 | generation <= root->root_key.offset) | |
7079 | continue; | |
7080 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7081 | ret = btrfs_comp_cpu_keys(&key, | |
7082 | &wc->update_progress); | |
7083 | if (ret < 0) | |
7084 | continue; | |
94fcca9f YZ |
7085 | } else { |
7086 | if (wc->level == 1 && | |
7087 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7088 | continue; | |
6407bf6d | 7089 | } |
1c4850e2 YZ |
7090 | reada: |
7091 | ret = readahead_tree_block(root, bytenr, blocksize, | |
7092 | generation); | |
7093 | if (ret) | |
bd56b302 | 7094 | break; |
1c4850e2 | 7095 | nread++; |
20524f02 | 7096 | } |
1c4850e2 | 7097 | wc->reada_slot = slot; |
20524f02 | 7098 | } |
2c47e605 | 7099 | |
f82d02d9 | 7100 | /* |
2c016dc2 | 7101 | * helper to process tree block while walking down the tree. |
2c47e605 | 7102 | * |
2c47e605 YZ |
7103 | * when wc->stage == UPDATE_BACKREF, this function updates |
7104 | * back refs for pointers in the block. | |
7105 | * | |
7106 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 7107 | */ |
2c47e605 | 7108 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 7109 | struct btrfs_root *root, |
2c47e605 | 7110 | struct btrfs_path *path, |
94fcca9f | 7111 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 7112 | { |
2c47e605 YZ |
7113 | int level = wc->level; |
7114 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 7115 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
7116 | int ret; |
7117 | ||
2c47e605 YZ |
7118 | if (wc->stage == UPDATE_BACKREF && |
7119 | btrfs_header_owner(eb) != root->root_key.objectid) | |
7120 | return 1; | |
f82d02d9 | 7121 | |
2c47e605 YZ |
7122 | /* |
7123 | * when reference count of tree block is 1, it won't increase | |
7124 | * again. once full backref flag is set, we never clear it. | |
7125 | */ | |
94fcca9f YZ |
7126 | if (lookup_info && |
7127 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
7128 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
7129 | BUG_ON(!path->locks[level]); |
7130 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7131 | eb->start, level, 1, |
2c47e605 YZ |
7132 | &wc->refs[level], |
7133 | &wc->flags[level]); | |
79787eaa JM |
7134 | BUG_ON(ret == -ENOMEM); |
7135 | if (ret) | |
7136 | return ret; | |
2c47e605 YZ |
7137 | BUG_ON(wc->refs[level] == 0); |
7138 | } | |
5d4f98a2 | 7139 | |
2c47e605 YZ |
7140 | if (wc->stage == DROP_REFERENCE) { |
7141 | if (wc->refs[level] > 1) | |
7142 | return 1; | |
f82d02d9 | 7143 | |
2c47e605 | 7144 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 7145 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7146 | path->locks[level] = 0; |
7147 | } | |
7148 | return 0; | |
7149 | } | |
f82d02d9 | 7150 | |
2c47e605 YZ |
7151 | /* wc->stage == UPDATE_BACKREF */ |
7152 | if (!(wc->flags[level] & flag)) { | |
7153 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 7154 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 7155 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 7156 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 7157 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 | 7158 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
b1c79e09 JB |
7159 | eb->len, flag, |
7160 | btrfs_header_level(eb), 0); | |
79787eaa | 7161 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7162 | wc->flags[level] |= flag; |
7163 | } | |
7164 | ||
7165 | /* | |
7166 | * the block is shared by multiple trees, so it's not good to | |
7167 | * keep the tree lock | |
7168 | */ | |
7169 | if (path->locks[level] && level > 0) { | |
bd681513 | 7170 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7171 | path->locks[level] = 0; |
7172 | } | |
7173 | return 0; | |
7174 | } | |
7175 | ||
1c4850e2 | 7176 | /* |
2c016dc2 | 7177 | * helper to process tree block pointer. |
1c4850e2 YZ |
7178 | * |
7179 | * when wc->stage == DROP_REFERENCE, this function checks | |
7180 | * reference count of the block pointed to. if the block | |
7181 | * is shared and we need update back refs for the subtree | |
7182 | * rooted at the block, this function changes wc->stage to | |
7183 | * UPDATE_BACKREF. if the block is shared and there is no | |
7184 | * need to update back, this function drops the reference | |
7185 | * to the block. | |
7186 | * | |
7187 | * NOTE: return value 1 means we should stop walking down. | |
7188 | */ | |
7189 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
7190 | struct btrfs_root *root, | |
7191 | struct btrfs_path *path, | |
94fcca9f | 7192 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
7193 | { |
7194 | u64 bytenr; | |
7195 | u64 generation; | |
7196 | u64 parent; | |
7197 | u32 blocksize; | |
7198 | struct btrfs_key key; | |
7199 | struct extent_buffer *next; | |
7200 | int level = wc->level; | |
7201 | int reada = 0; | |
7202 | int ret = 0; | |
7203 | ||
7204 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
7205 | path->slots[level]); | |
7206 | /* | |
7207 | * if the lower level block was created before the snapshot | |
7208 | * was created, we know there is no need to update back refs | |
7209 | * for the subtree | |
7210 | */ | |
7211 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
7212 | generation <= root->root_key.offset) { |
7213 | *lookup_info = 1; | |
1c4850e2 | 7214 | return 1; |
94fcca9f | 7215 | } |
1c4850e2 YZ |
7216 | |
7217 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
7218 | blocksize = btrfs_level_size(root, level - 1); | |
7219 | ||
7220 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
7221 | if (!next) { | |
7222 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
7223 | if (!next) |
7224 | return -ENOMEM; | |
b2aaaa3b JB |
7225 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
7226 | level - 1); | |
1c4850e2 YZ |
7227 | reada = 1; |
7228 | } | |
7229 | btrfs_tree_lock(next); | |
7230 | btrfs_set_lock_blocking(next); | |
7231 | ||
3173a18f | 7232 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
7233 | &wc->refs[level - 1], |
7234 | &wc->flags[level - 1]); | |
79787eaa JM |
7235 | if (ret < 0) { |
7236 | btrfs_tree_unlock(next); | |
7237 | return ret; | |
7238 | } | |
7239 | ||
c2cf52eb SK |
7240 | if (unlikely(wc->refs[level - 1] == 0)) { |
7241 | btrfs_err(root->fs_info, "Missing references."); | |
7242 | BUG(); | |
7243 | } | |
94fcca9f | 7244 | *lookup_info = 0; |
1c4850e2 | 7245 | |
94fcca9f | 7246 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 7247 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
7248 | if (level == 1 && |
7249 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7250 | goto skip; | |
7251 | ||
1c4850e2 YZ |
7252 | if (!wc->update_ref || |
7253 | generation <= root->root_key.offset) | |
7254 | goto skip; | |
7255 | ||
7256 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
7257 | path->slots[level]); | |
7258 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
7259 | if (ret < 0) | |
7260 | goto skip; | |
7261 | ||
7262 | wc->stage = UPDATE_BACKREF; | |
7263 | wc->shared_level = level - 1; | |
7264 | } | |
94fcca9f YZ |
7265 | } else { |
7266 | if (level == 1 && | |
7267 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7268 | goto skip; | |
1c4850e2 YZ |
7269 | } |
7270 | ||
b9fab919 | 7271 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
7272 | btrfs_tree_unlock(next); |
7273 | free_extent_buffer(next); | |
7274 | next = NULL; | |
94fcca9f | 7275 | *lookup_info = 1; |
1c4850e2 YZ |
7276 | } |
7277 | ||
7278 | if (!next) { | |
7279 | if (reada && level == 1) | |
7280 | reada_walk_down(trans, root, wc, path); | |
7281 | next = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
7282 | if (!next || !extent_buffer_uptodate(next)) { |
7283 | free_extent_buffer(next); | |
97d9a8a4 | 7284 | return -EIO; |
416bc658 | 7285 | } |
1c4850e2 YZ |
7286 | btrfs_tree_lock(next); |
7287 | btrfs_set_lock_blocking(next); | |
7288 | } | |
7289 | ||
7290 | level--; | |
7291 | BUG_ON(level != btrfs_header_level(next)); | |
7292 | path->nodes[level] = next; | |
7293 | path->slots[level] = 0; | |
bd681513 | 7294 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
7295 | wc->level = level; |
7296 | if (wc->level == 1) | |
7297 | wc->reada_slot = 0; | |
7298 | return 0; | |
7299 | skip: | |
7300 | wc->refs[level - 1] = 0; | |
7301 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
7302 | if (wc->stage == DROP_REFERENCE) { |
7303 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
7304 | parent = path->nodes[level]->start; | |
7305 | } else { | |
7306 | BUG_ON(root->root_key.objectid != | |
7307 | btrfs_header_owner(path->nodes[level])); | |
7308 | parent = 0; | |
7309 | } | |
1c4850e2 | 7310 | |
94fcca9f | 7311 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 7312 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 7313 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 7314 | } |
1c4850e2 YZ |
7315 | btrfs_tree_unlock(next); |
7316 | free_extent_buffer(next); | |
94fcca9f | 7317 | *lookup_info = 1; |
1c4850e2 YZ |
7318 | return 1; |
7319 | } | |
7320 | ||
2c47e605 | 7321 | /* |
2c016dc2 | 7322 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
7323 | * |
7324 | * when wc->stage == DROP_REFERENCE, this function drops | |
7325 | * reference count on the block. | |
7326 | * | |
7327 | * when wc->stage == UPDATE_BACKREF, this function changes | |
7328 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
7329 | * to UPDATE_BACKREF previously while processing the block. | |
7330 | * | |
7331 | * NOTE: return value 1 means we should stop walking up. | |
7332 | */ | |
7333 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
7334 | struct btrfs_root *root, | |
7335 | struct btrfs_path *path, | |
7336 | struct walk_control *wc) | |
7337 | { | |
f0486c68 | 7338 | int ret; |
2c47e605 YZ |
7339 | int level = wc->level; |
7340 | struct extent_buffer *eb = path->nodes[level]; | |
7341 | u64 parent = 0; | |
7342 | ||
7343 | if (wc->stage == UPDATE_BACKREF) { | |
7344 | BUG_ON(wc->shared_level < level); | |
7345 | if (level < wc->shared_level) | |
7346 | goto out; | |
7347 | ||
2c47e605 YZ |
7348 | ret = find_next_key(path, level + 1, &wc->update_progress); |
7349 | if (ret > 0) | |
7350 | wc->update_ref = 0; | |
7351 | ||
7352 | wc->stage = DROP_REFERENCE; | |
7353 | wc->shared_level = -1; | |
7354 | path->slots[level] = 0; | |
7355 | ||
7356 | /* | |
7357 | * check reference count again if the block isn't locked. | |
7358 | * we should start walking down the tree again if reference | |
7359 | * count is one. | |
7360 | */ | |
7361 | if (!path->locks[level]) { | |
7362 | BUG_ON(level == 0); | |
7363 | btrfs_tree_lock(eb); | |
7364 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7365 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7366 | |
7367 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7368 | eb->start, level, 1, |
2c47e605 YZ |
7369 | &wc->refs[level], |
7370 | &wc->flags[level]); | |
79787eaa JM |
7371 | if (ret < 0) { |
7372 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7373 | path->locks[level] = 0; |
79787eaa JM |
7374 | return ret; |
7375 | } | |
2c47e605 YZ |
7376 | BUG_ON(wc->refs[level] == 0); |
7377 | if (wc->refs[level] == 1) { | |
bd681513 | 7378 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7379 | path->locks[level] = 0; |
2c47e605 YZ |
7380 | return 1; |
7381 | } | |
f82d02d9 | 7382 | } |
2c47e605 | 7383 | } |
f82d02d9 | 7384 | |
2c47e605 YZ |
7385 | /* wc->stage == DROP_REFERENCE */ |
7386 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7387 | |
2c47e605 YZ |
7388 | if (wc->refs[level] == 1) { |
7389 | if (level == 0) { | |
7390 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7391 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7392 | wc->for_reloc); | |
2c47e605 | 7393 | else |
66d7e7f0 AJ |
7394 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7395 | wc->for_reloc); | |
79787eaa | 7396 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7397 | } |
7398 | /* make block locked assertion in clean_tree_block happy */ | |
7399 | if (!path->locks[level] && | |
7400 | btrfs_header_generation(eb) == trans->transid) { | |
7401 | btrfs_tree_lock(eb); | |
7402 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7403 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7404 | } |
7405 | clean_tree_block(trans, root, eb); | |
7406 | } | |
7407 | ||
7408 | if (eb == root->node) { | |
7409 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7410 | parent = eb->start; | |
7411 | else | |
7412 | BUG_ON(root->root_key.objectid != | |
7413 | btrfs_header_owner(eb)); | |
7414 | } else { | |
7415 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7416 | parent = path->nodes[level + 1]->start; | |
7417 | else | |
7418 | BUG_ON(root->root_key.objectid != | |
7419 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7420 | } |
f82d02d9 | 7421 | |
5581a51a | 7422 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7423 | out: |
7424 | wc->refs[level] = 0; | |
7425 | wc->flags[level] = 0; | |
f0486c68 | 7426 | return 0; |
2c47e605 YZ |
7427 | } |
7428 | ||
7429 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7430 | struct btrfs_root *root, | |
7431 | struct btrfs_path *path, | |
7432 | struct walk_control *wc) | |
7433 | { | |
2c47e605 | 7434 | int level = wc->level; |
94fcca9f | 7435 | int lookup_info = 1; |
2c47e605 YZ |
7436 | int ret; |
7437 | ||
7438 | while (level >= 0) { | |
94fcca9f | 7439 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7440 | if (ret > 0) |
7441 | break; | |
7442 | ||
7443 | if (level == 0) | |
7444 | break; | |
7445 | ||
7a7965f8 YZ |
7446 | if (path->slots[level] >= |
7447 | btrfs_header_nritems(path->nodes[level])) | |
7448 | break; | |
7449 | ||
94fcca9f | 7450 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7451 | if (ret > 0) { |
7452 | path->slots[level]++; | |
7453 | continue; | |
90d2c51d MX |
7454 | } else if (ret < 0) |
7455 | return ret; | |
1c4850e2 | 7456 | level = wc->level; |
f82d02d9 | 7457 | } |
f82d02d9 YZ |
7458 | return 0; |
7459 | } | |
7460 | ||
d397712b | 7461 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7462 | struct btrfs_root *root, |
f82d02d9 | 7463 | struct btrfs_path *path, |
2c47e605 | 7464 | struct walk_control *wc, int max_level) |
20524f02 | 7465 | { |
2c47e605 | 7466 | int level = wc->level; |
20524f02 | 7467 | int ret; |
9f3a7427 | 7468 | |
2c47e605 YZ |
7469 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7470 | while (level < max_level && path->nodes[level]) { | |
7471 | wc->level = level; | |
7472 | if (path->slots[level] + 1 < | |
7473 | btrfs_header_nritems(path->nodes[level])) { | |
7474 | path->slots[level]++; | |
20524f02 CM |
7475 | return 0; |
7476 | } else { | |
2c47e605 YZ |
7477 | ret = walk_up_proc(trans, root, path, wc); |
7478 | if (ret > 0) | |
7479 | return 0; | |
bd56b302 | 7480 | |
2c47e605 | 7481 | if (path->locks[level]) { |
bd681513 CM |
7482 | btrfs_tree_unlock_rw(path->nodes[level], |
7483 | path->locks[level]); | |
2c47e605 | 7484 | path->locks[level] = 0; |
f82d02d9 | 7485 | } |
2c47e605 YZ |
7486 | free_extent_buffer(path->nodes[level]); |
7487 | path->nodes[level] = NULL; | |
7488 | level++; | |
20524f02 CM |
7489 | } |
7490 | } | |
7491 | return 1; | |
7492 | } | |
7493 | ||
9aca1d51 | 7494 | /* |
2c47e605 YZ |
7495 | * drop a subvolume tree. |
7496 | * | |
7497 | * this function traverses the tree freeing any blocks that only | |
7498 | * referenced by the tree. | |
7499 | * | |
7500 | * when a shared tree block is found. this function decreases its | |
7501 | * reference count by one. if update_ref is true, this function | |
7502 | * also make sure backrefs for the shared block and all lower level | |
7503 | * blocks are properly updated. | |
9d1a2a3a DS |
7504 | * |
7505 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 7506 | */ |
2c536799 | 7507 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7508 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7509 | int for_reloc) | |
20524f02 | 7510 | { |
5caf2a00 | 7511 | struct btrfs_path *path; |
2c47e605 YZ |
7512 | struct btrfs_trans_handle *trans; |
7513 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7514 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7515 | struct walk_control *wc; |
7516 | struct btrfs_key key; | |
7517 | int err = 0; | |
7518 | int ret; | |
7519 | int level; | |
d29a9f62 | 7520 | bool root_dropped = false; |
20524f02 | 7521 | |
5caf2a00 | 7522 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7523 | if (!path) { |
7524 | err = -ENOMEM; | |
7525 | goto out; | |
7526 | } | |
20524f02 | 7527 | |
2c47e605 | 7528 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7529 | if (!wc) { |
7530 | btrfs_free_path(path); | |
cb1b69f4 TI |
7531 | err = -ENOMEM; |
7532 | goto out; | |
38a1a919 | 7533 | } |
2c47e605 | 7534 | |
a22285a6 | 7535 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7536 | if (IS_ERR(trans)) { |
7537 | err = PTR_ERR(trans); | |
7538 | goto out_free; | |
7539 | } | |
98d5dc13 | 7540 | |
3fd0a558 YZ |
7541 | if (block_rsv) |
7542 | trans->block_rsv = block_rsv; | |
2c47e605 | 7543 | |
9f3a7427 | 7544 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7545 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7546 | path->nodes[level] = btrfs_lock_root_node(root); |
7547 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7548 | path->slots[level] = 0; |
bd681513 | 7549 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7550 | memset(&wc->update_progress, 0, |
7551 | sizeof(wc->update_progress)); | |
9f3a7427 | 7552 | } else { |
9f3a7427 | 7553 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7554 | memcpy(&wc->update_progress, &key, |
7555 | sizeof(wc->update_progress)); | |
7556 | ||
6702ed49 | 7557 | level = root_item->drop_level; |
2c47e605 | 7558 | BUG_ON(level == 0); |
6702ed49 | 7559 | path->lowest_level = level; |
2c47e605 YZ |
7560 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7561 | path->lowest_level = 0; | |
7562 | if (ret < 0) { | |
7563 | err = ret; | |
79787eaa | 7564 | goto out_end_trans; |
9f3a7427 | 7565 | } |
1c4850e2 | 7566 | WARN_ON(ret > 0); |
2c47e605 | 7567 | |
7d9eb12c CM |
7568 | /* |
7569 | * unlock our path, this is safe because only this | |
7570 | * function is allowed to delete this snapshot | |
7571 | */ | |
5d4f98a2 | 7572 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7573 | |
7574 | level = btrfs_header_level(root->node); | |
7575 | while (1) { | |
7576 | btrfs_tree_lock(path->nodes[level]); | |
7577 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 7578 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7579 | |
7580 | ret = btrfs_lookup_extent_info(trans, root, | |
7581 | path->nodes[level]->start, | |
3173a18f | 7582 | level, 1, &wc->refs[level], |
2c47e605 | 7583 | &wc->flags[level]); |
79787eaa JM |
7584 | if (ret < 0) { |
7585 | err = ret; | |
7586 | goto out_end_trans; | |
7587 | } | |
2c47e605 YZ |
7588 | BUG_ON(wc->refs[level] == 0); |
7589 | ||
7590 | if (level == root_item->drop_level) | |
7591 | break; | |
7592 | ||
7593 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 7594 | path->locks[level] = 0; |
2c47e605 YZ |
7595 | WARN_ON(wc->refs[level] != 1); |
7596 | level--; | |
7597 | } | |
9f3a7427 | 7598 | } |
2c47e605 YZ |
7599 | |
7600 | wc->level = level; | |
7601 | wc->shared_level = -1; | |
7602 | wc->stage = DROP_REFERENCE; | |
7603 | wc->update_ref = update_ref; | |
7604 | wc->keep_locks = 0; | |
66d7e7f0 | 7605 | wc->for_reloc = for_reloc; |
1c4850e2 | 7606 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7607 | |
d397712b | 7608 | while (1) { |
9d1a2a3a | 7609 | |
2c47e605 YZ |
7610 | ret = walk_down_tree(trans, root, path, wc); |
7611 | if (ret < 0) { | |
7612 | err = ret; | |
20524f02 | 7613 | break; |
2c47e605 | 7614 | } |
9aca1d51 | 7615 | |
2c47e605 YZ |
7616 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7617 | if (ret < 0) { | |
7618 | err = ret; | |
20524f02 | 7619 | break; |
2c47e605 YZ |
7620 | } |
7621 | ||
7622 | if (ret > 0) { | |
7623 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7624 | break; |
7625 | } | |
2c47e605 YZ |
7626 | |
7627 | if (wc->stage == DROP_REFERENCE) { | |
7628 | level = wc->level; | |
7629 | btrfs_node_key(path->nodes[level], | |
7630 | &root_item->drop_progress, | |
7631 | path->slots[level]); | |
7632 | root_item->drop_level = level; | |
7633 | } | |
7634 | ||
7635 | BUG_ON(wc->level == 0); | |
3c8f2422 JB |
7636 | if (btrfs_should_end_transaction(trans, tree_root) || |
7637 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
2c47e605 YZ |
7638 | ret = btrfs_update_root(trans, tree_root, |
7639 | &root->root_key, | |
7640 | root_item); | |
79787eaa JM |
7641 | if (ret) { |
7642 | btrfs_abort_transaction(trans, tree_root, ret); | |
7643 | err = ret; | |
7644 | goto out_end_trans; | |
7645 | } | |
2c47e605 | 7646 | |
3fd0a558 | 7647 | btrfs_end_transaction_throttle(trans, tree_root); |
3c8f2422 JB |
7648 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
7649 | pr_debug("btrfs: drop snapshot early exit\n"); | |
7650 | err = -EAGAIN; | |
7651 | goto out_free; | |
7652 | } | |
7653 | ||
a22285a6 | 7654 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7655 | if (IS_ERR(trans)) { |
7656 | err = PTR_ERR(trans); | |
7657 | goto out_free; | |
7658 | } | |
3fd0a558 YZ |
7659 | if (block_rsv) |
7660 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7661 | } |
20524f02 | 7662 | } |
b3b4aa74 | 7663 | btrfs_release_path(path); |
79787eaa JM |
7664 | if (err) |
7665 | goto out_end_trans; | |
2c47e605 YZ |
7666 | |
7667 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7668 | if (ret) { |
7669 | btrfs_abort_transaction(trans, tree_root, ret); | |
7670 | goto out_end_trans; | |
7671 | } | |
2c47e605 | 7672 | |
76dda93c | 7673 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
7674 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
7675 | NULL, NULL); | |
79787eaa JM |
7676 | if (ret < 0) { |
7677 | btrfs_abort_transaction(trans, tree_root, ret); | |
7678 | err = ret; | |
7679 | goto out_end_trans; | |
7680 | } else if (ret > 0) { | |
84cd948c JB |
7681 | /* if we fail to delete the orphan item this time |
7682 | * around, it'll get picked up the next time. | |
7683 | * | |
7684 | * The most common failure here is just -ENOENT. | |
7685 | */ | |
7686 | btrfs_del_orphan_item(trans, tree_root, | |
7687 | root->root_key.objectid); | |
76dda93c YZ |
7688 | } |
7689 | } | |
7690 | ||
7691 | if (root->in_radix) { | |
cb517eab | 7692 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
76dda93c YZ |
7693 | } else { |
7694 | free_extent_buffer(root->node); | |
7695 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 7696 | btrfs_put_fs_root(root); |
76dda93c | 7697 | } |
d29a9f62 | 7698 | root_dropped = true; |
79787eaa | 7699 | out_end_trans: |
3fd0a558 | 7700 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7701 | out_free: |
2c47e605 | 7702 | kfree(wc); |
5caf2a00 | 7703 | btrfs_free_path(path); |
cb1b69f4 | 7704 | out: |
d29a9f62 JB |
7705 | /* |
7706 | * So if we need to stop dropping the snapshot for whatever reason we | |
7707 | * need to make sure to add it back to the dead root list so that we | |
7708 | * keep trying to do the work later. This also cleans up roots if we | |
7709 | * don't have it in the radix (like when we recover after a power fail | |
7710 | * or unmount) so we don't leak memory. | |
7711 | */ | |
b37b39cd | 7712 | if (!for_reloc && root_dropped == false) |
d29a9f62 | 7713 | btrfs_add_dead_root(root); |
cb1b69f4 TI |
7714 | if (err) |
7715 | btrfs_std_error(root->fs_info, err); | |
2c536799 | 7716 | return err; |
20524f02 | 7717 | } |
9078a3e1 | 7718 | |
2c47e605 YZ |
7719 | /* |
7720 | * drop subtree rooted at tree block 'node'. | |
7721 | * | |
7722 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7723 | * only used by relocation code |
2c47e605 | 7724 | */ |
f82d02d9 YZ |
7725 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7726 | struct btrfs_root *root, | |
7727 | struct extent_buffer *node, | |
7728 | struct extent_buffer *parent) | |
7729 | { | |
7730 | struct btrfs_path *path; | |
2c47e605 | 7731 | struct walk_control *wc; |
f82d02d9 YZ |
7732 | int level; |
7733 | int parent_level; | |
7734 | int ret = 0; | |
7735 | int wret; | |
7736 | ||
2c47e605 YZ |
7737 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7738 | ||
f82d02d9 | 7739 | path = btrfs_alloc_path(); |
db5b493a TI |
7740 | if (!path) |
7741 | return -ENOMEM; | |
f82d02d9 | 7742 | |
2c47e605 | 7743 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7744 | if (!wc) { |
7745 | btrfs_free_path(path); | |
7746 | return -ENOMEM; | |
7747 | } | |
2c47e605 | 7748 | |
b9447ef8 | 7749 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7750 | parent_level = btrfs_header_level(parent); |
7751 | extent_buffer_get(parent); | |
7752 | path->nodes[parent_level] = parent; | |
7753 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7754 | ||
b9447ef8 | 7755 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7756 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7757 | path->nodes[level] = node; |
7758 | path->slots[level] = 0; | |
bd681513 | 7759 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7760 | |
7761 | wc->refs[parent_level] = 1; | |
7762 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7763 | wc->level = level; | |
7764 | wc->shared_level = -1; | |
7765 | wc->stage = DROP_REFERENCE; | |
7766 | wc->update_ref = 0; | |
7767 | wc->keep_locks = 1; | |
66d7e7f0 | 7768 | wc->for_reloc = 1; |
1c4850e2 | 7769 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7770 | |
7771 | while (1) { | |
2c47e605 YZ |
7772 | wret = walk_down_tree(trans, root, path, wc); |
7773 | if (wret < 0) { | |
f82d02d9 | 7774 | ret = wret; |
f82d02d9 | 7775 | break; |
2c47e605 | 7776 | } |
f82d02d9 | 7777 | |
2c47e605 | 7778 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7779 | if (wret < 0) |
7780 | ret = wret; | |
7781 | if (wret != 0) | |
7782 | break; | |
7783 | } | |
7784 | ||
2c47e605 | 7785 | kfree(wc); |
f82d02d9 YZ |
7786 | btrfs_free_path(path); |
7787 | return ret; | |
7788 | } | |
7789 | ||
ec44a35c CM |
7790 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7791 | { | |
7792 | u64 num_devices; | |
fc67c450 | 7793 | u64 stripped; |
e4d8ec0f | 7794 | |
fc67c450 ID |
7795 | /* |
7796 | * if restripe for this chunk_type is on pick target profile and | |
7797 | * return, otherwise do the usual balance | |
7798 | */ | |
7799 | stripped = get_restripe_target(root->fs_info, flags); | |
7800 | if (stripped) | |
7801 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7802 | |
cd02dca5 CM |
7803 | /* |
7804 | * we add in the count of missing devices because we want | |
7805 | * to make sure that any RAID levels on a degraded FS | |
7806 | * continue to be honored. | |
7807 | */ | |
7808 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7809 | root->fs_info->fs_devices->missing_devices; | |
7810 | ||
fc67c450 | 7811 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7812 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7813 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7814 | ||
ec44a35c CM |
7815 | if (num_devices == 1) { |
7816 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7817 | stripped = flags & ~stripped; | |
7818 | ||
7819 | /* turn raid0 into single device chunks */ | |
7820 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7821 | return stripped; | |
7822 | ||
7823 | /* turn mirroring into duplication */ | |
7824 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7825 | BTRFS_BLOCK_GROUP_RAID10)) | |
7826 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7827 | } else { |
7828 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7829 | if (flags & stripped) |
7830 | return flags; | |
7831 | ||
7832 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7833 | stripped = flags & ~stripped; | |
7834 | ||
7835 | /* switch duplicated blocks with raid1 */ | |
7836 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7837 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7838 | ||
e3176ca2 | 7839 | /* this is drive concat, leave it alone */ |
ec44a35c | 7840 | } |
e3176ca2 | 7841 | |
ec44a35c CM |
7842 | return flags; |
7843 | } | |
7844 | ||
199c36ea | 7845 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7846 | { |
f0486c68 YZ |
7847 | struct btrfs_space_info *sinfo = cache->space_info; |
7848 | u64 num_bytes; | |
199c36ea | 7849 | u64 min_allocable_bytes; |
f0486c68 | 7850 | int ret = -ENOSPC; |
0ef3e66b | 7851 | |
c286ac48 | 7852 | |
199c36ea MX |
7853 | /* |
7854 | * We need some metadata space and system metadata space for | |
7855 | * allocating chunks in some corner cases until we force to set | |
7856 | * it to be readonly. | |
7857 | */ | |
7858 | if ((sinfo->flags & | |
7859 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7860 | !force) | |
7861 | min_allocable_bytes = 1 * 1024 * 1024; | |
7862 | else | |
7863 | min_allocable_bytes = 0; | |
7864 | ||
f0486c68 YZ |
7865 | spin_lock(&sinfo->lock); |
7866 | spin_lock(&cache->lock); | |
61cfea9b W |
7867 | |
7868 | if (cache->ro) { | |
7869 | ret = 0; | |
7870 | goto out; | |
7871 | } | |
7872 | ||
f0486c68 YZ |
7873 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7874 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7875 | ||
7876 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7877 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7878 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7879 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7880 | cache->ro = 1; |
7881 | ret = 0; | |
7882 | } | |
61cfea9b | 7883 | out: |
f0486c68 YZ |
7884 | spin_unlock(&cache->lock); |
7885 | spin_unlock(&sinfo->lock); | |
7886 | return ret; | |
7887 | } | |
7d9eb12c | 7888 | |
f0486c68 YZ |
7889 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7890 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7891 | |
f0486c68 YZ |
7892 | { |
7893 | struct btrfs_trans_handle *trans; | |
7894 | u64 alloc_flags; | |
7895 | int ret; | |
7d9eb12c | 7896 | |
f0486c68 | 7897 | BUG_ON(cache->ro); |
0ef3e66b | 7898 | |
ff5714cc | 7899 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7900 | if (IS_ERR(trans)) |
7901 | return PTR_ERR(trans); | |
5d4f98a2 | 7902 | |
f0486c68 | 7903 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7904 | if (alloc_flags != cache->flags) { |
698d0082 | 7905 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7906 | CHUNK_ALLOC_FORCE); |
7907 | if (ret < 0) | |
7908 | goto out; | |
7909 | } | |
5d4f98a2 | 7910 | |
199c36ea | 7911 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7912 | if (!ret) |
7913 | goto out; | |
7914 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7915 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7916 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7917 | if (ret < 0) |
7918 | goto out; | |
199c36ea | 7919 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7920 | out: |
7921 | btrfs_end_transaction(trans, root); | |
7922 | return ret; | |
7923 | } | |
5d4f98a2 | 7924 | |
c87f08ca CM |
7925 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7926 | struct btrfs_root *root, u64 type) | |
7927 | { | |
7928 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7929 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7930 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7931 | } |
7932 | ||
6d07bcec MX |
7933 | /* |
7934 | * helper to account the unused space of all the readonly block group in the | |
7935 | * list. takes mirrors into account. | |
7936 | */ | |
7937 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7938 | { | |
7939 | struct btrfs_block_group_cache *block_group; | |
7940 | u64 free_bytes = 0; | |
7941 | int factor; | |
7942 | ||
7943 | list_for_each_entry(block_group, groups_list, list) { | |
7944 | spin_lock(&block_group->lock); | |
7945 | ||
7946 | if (!block_group->ro) { | |
7947 | spin_unlock(&block_group->lock); | |
7948 | continue; | |
7949 | } | |
7950 | ||
7951 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7952 | BTRFS_BLOCK_GROUP_RAID10 | | |
7953 | BTRFS_BLOCK_GROUP_DUP)) | |
7954 | factor = 2; | |
7955 | else | |
7956 | factor = 1; | |
7957 | ||
7958 | free_bytes += (block_group->key.offset - | |
7959 | btrfs_block_group_used(&block_group->item)) * | |
7960 | factor; | |
7961 | ||
7962 | spin_unlock(&block_group->lock); | |
7963 | } | |
7964 | ||
7965 | return free_bytes; | |
7966 | } | |
7967 | ||
7968 | /* | |
7969 | * helper to account the unused space of all the readonly block group in the | |
7970 | * space_info. takes mirrors into account. | |
7971 | */ | |
7972 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
7973 | { | |
7974 | int i; | |
7975 | u64 free_bytes = 0; | |
7976 | ||
7977 | spin_lock(&sinfo->lock); | |
7978 | ||
7979 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
7980 | if (!list_empty(&sinfo->block_groups[i])) | |
7981 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
7982 | &sinfo->block_groups[i]); | |
7983 | ||
7984 | spin_unlock(&sinfo->lock); | |
7985 | ||
7986 | return free_bytes; | |
7987 | } | |
7988 | ||
143bede5 | 7989 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 7990 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 7991 | { |
f0486c68 YZ |
7992 | struct btrfs_space_info *sinfo = cache->space_info; |
7993 | u64 num_bytes; | |
7994 | ||
7995 | BUG_ON(!cache->ro); | |
7996 | ||
7997 | spin_lock(&sinfo->lock); | |
7998 | spin_lock(&cache->lock); | |
7999 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8000 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8001 | sinfo->bytes_readonly -= num_bytes; | |
8002 | cache->ro = 0; | |
8003 | spin_unlock(&cache->lock); | |
8004 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
8005 | } |
8006 | ||
ba1bf481 JB |
8007 | /* |
8008 | * checks to see if its even possible to relocate this block group. | |
8009 | * | |
8010 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
8011 | * ok to go ahead and try. | |
8012 | */ | |
8013 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 8014 | { |
ba1bf481 JB |
8015 | struct btrfs_block_group_cache *block_group; |
8016 | struct btrfs_space_info *space_info; | |
8017 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8018 | struct btrfs_device *device; | |
6df9a95e | 8019 | struct btrfs_trans_handle *trans; |
cdcb725c | 8020 | u64 min_free; |
6719db6a JB |
8021 | u64 dev_min = 1; |
8022 | u64 dev_nr = 0; | |
4a5e98f5 | 8023 | u64 target; |
cdcb725c | 8024 | int index; |
ba1bf481 JB |
8025 | int full = 0; |
8026 | int ret = 0; | |
1a40e23b | 8027 | |
ba1bf481 | 8028 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 8029 | |
ba1bf481 JB |
8030 | /* odd, couldn't find the block group, leave it alone */ |
8031 | if (!block_group) | |
8032 | return -1; | |
1a40e23b | 8033 | |
cdcb725c | 8034 | min_free = btrfs_block_group_used(&block_group->item); |
8035 | ||
ba1bf481 | 8036 | /* no bytes used, we're good */ |
cdcb725c | 8037 | if (!min_free) |
1a40e23b ZY |
8038 | goto out; |
8039 | ||
ba1bf481 JB |
8040 | space_info = block_group->space_info; |
8041 | spin_lock(&space_info->lock); | |
17d217fe | 8042 | |
ba1bf481 | 8043 | full = space_info->full; |
17d217fe | 8044 | |
ba1bf481 JB |
8045 | /* |
8046 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
8047 | * relocate it unless we're able to allocate a new chunk below. |
8048 | * | |
8049 | * Otherwise, we need to make sure we have room in the space to handle | |
8050 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8051 | */ |
7ce618db | 8052 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 8053 | (space_info->bytes_used + space_info->bytes_reserved + |
8054 | space_info->bytes_pinned + space_info->bytes_readonly + | |
8055 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
8056 | spin_unlock(&space_info->lock); |
8057 | goto out; | |
17d217fe | 8058 | } |
ba1bf481 | 8059 | spin_unlock(&space_info->lock); |
ea8c2819 | 8060 | |
ba1bf481 JB |
8061 | /* |
8062 | * ok we don't have enough space, but maybe we have free space on our | |
8063 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
8064 | * alloc devices and guess if we have enough space. if this block |
8065 | * group is going to be restriped, run checks against the target | |
8066 | * profile instead of the current one. | |
ba1bf481 JB |
8067 | */ |
8068 | ret = -1; | |
ea8c2819 | 8069 | |
cdcb725c | 8070 | /* |
8071 | * index: | |
8072 | * 0: raid10 | |
8073 | * 1: raid1 | |
8074 | * 2: dup | |
8075 | * 3: raid0 | |
8076 | * 4: single | |
8077 | */ | |
4a5e98f5 ID |
8078 | target = get_restripe_target(root->fs_info, block_group->flags); |
8079 | if (target) { | |
31e50229 | 8080 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
8081 | } else { |
8082 | /* | |
8083 | * this is just a balance, so if we were marked as full | |
8084 | * we know there is no space for a new chunk | |
8085 | */ | |
8086 | if (full) | |
8087 | goto out; | |
8088 | ||
8089 | index = get_block_group_index(block_group); | |
8090 | } | |
8091 | ||
e6ec716f | 8092 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 8093 | dev_min = 4; |
6719db6a JB |
8094 | /* Divide by 2 */ |
8095 | min_free >>= 1; | |
e6ec716f | 8096 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 8097 | dev_min = 2; |
e6ec716f | 8098 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
8099 | /* Multiply by 2 */ |
8100 | min_free <<= 1; | |
e6ec716f | 8101 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 8102 | dev_min = fs_devices->rw_devices; |
6719db6a | 8103 | do_div(min_free, dev_min); |
cdcb725c | 8104 | } |
8105 | ||
6df9a95e JB |
8106 | /* We need to do this so that we can look at pending chunks */ |
8107 | trans = btrfs_join_transaction(root); | |
8108 | if (IS_ERR(trans)) { | |
8109 | ret = PTR_ERR(trans); | |
8110 | goto out; | |
8111 | } | |
8112 | ||
ba1bf481 JB |
8113 | mutex_lock(&root->fs_info->chunk_mutex); |
8114 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 8115 | u64 dev_offset; |
56bec294 | 8116 | |
ba1bf481 JB |
8117 | /* |
8118 | * check to make sure we can actually find a chunk with enough | |
8119 | * space to fit our block group in. | |
8120 | */ | |
63a212ab SB |
8121 | if (device->total_bytes > device->bytes_used + min_free && |
8122 | !device->is_tgtdev_for_dev_replace) { | |
6df9a95e | 8123 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 8124 | &dev_offset, NULL); |
ba1bf481 | 8125 | if (!ret) |
cdcb725c | 8126 | dev_nr++; |
8127 | ||
8128 | if (dev_nr >= dev_min) | |
73e48b27 | 8129 | break; |
cdcb725c | 8130 | |
ba1bf481 | 8131 | ret = -1; |
725c8463 | 8132 | } |
edbd8d4e | 8133 | } |
ba1bf481 | 8134 | mutex_unlock(&root->fs_info->chunk_mutex); |
6df9a95e | 8135 | btrfs_end_transaction(trans, root); |
edbd8d4e | 8136 | out: |
ba1bf481 | 8137 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8138 | return ret; |
8139 | } | |
8140 | ||
b2950863 CH |
8141 | static int find_first_block_group(struct btrfs_root *root, |
8142 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8143 | { |
925baedd | 8144 | int ret = 0; |
0b86a832 CM |
8145 | struct btrfs_key found_key; |
8146 | struct extent_buffer *leaf; | |
8147 | int slot; | |
edbd8d4e | 8148 | |
0b86a832 CM |
8149 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8150 | if (ret < 0) | |
925baedd CM |
8151 | goto out; |
8152 | ||
d397712b | 8153 | while (1) { |
0b86a832 | 8154 | slot = path->slots[0]; |
edbd8d4e | 8155 | leaf = path->nodes[0]; |
0b86a832 CM |
8156 | if (slot >= btrfs_header_nritems(leaf)) { |
8157 | ret = btrfs_next_leaf(root, path); | |
8158 | if (ret == 0) | |
8159 | continue; | |
8160 | if (ret < 0) | |
925baedd | 8161 | goto out; |
0b86a832 | 8162 | break; |
edbd8d4e | 8163 | } |
0b86a832 | 8164 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8165 | |
0b86a832 | 8166 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8167 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8168 | ret = 0; | |
8169 | goto out; | |
8170 | } | |
0b86a832 | 8171 | path->slots[0]++; |
edbd8d4e | 8172 | } |
925baedd | 8173 | out: |
0b86a832 | 8174 | return ret; |
edbd8d4e CM |
8175 | } |
8176 | ||
0af3d00b JB |
8177 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8178 | { | |
8179 | struct btrfs_block_group_cache *block_group; | |
8180 | u64 last = 0; | |
8181 | ||
8182 | while (1) { | |
8183 | struct inode *inode; | |
8184 | ||
8185 | block_group = btrfs_lookup_first_block_group(info, last); | |
8186 | while (block_group) { | |
8187 | spin_lock(&block_group->lock); | |
8188 | if (block_group->iref) | |
8189 | break; | |
8190 | spin_unlock(&block_group->lock); | |
8191 | block_group = next_block_group(info->tree_root, | |
8192 | block_group); | |
8193 | } | |
8194 | if (!block_group) { | |
8195 | if (last == 0) | |
8196 | break; | |
8197 | last = 0; | |
8198 | continue; | |
8199 | } | |
8200 | ||
8201 | inode = block_group->inode; | |
8202 | block_group->iref = 0; | |
8203 | block_group->inode = NULL; | |
8204 | spin_unlock(&block_group->lock); | |
8205 | iput(inode); | |
8206 | last = block_group->key.objectid + block_group->key.offset; | |
8207 | btrfs_put_block_group(block_group); | |
8208 | } | |
8209 | } | |
8210 | ||
1a40e23b ZY |
8211 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8212 | { | |
8213 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8214 | struct btrfs_space_info *space_info; |
11833d66 | 8215 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8216 | struct rb_node *n; |
8217 | ||
11833d66 YZ |
8218 | down_write(&info->extent_commit_sem); |
8219 | while (!list_empty(&info->caching_block_groups)) { | |
8220 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8221 | struct btrfs_caching_control, list); | |
8222 | list_del(&caching_ctl->list); | |
8223 | put_caching_control(caching_ctl); | |
8224 | } | |
8225 | up_write(&info->extent_commit_sem); | |
8226 | ||
1a40e23b ZY |
8227 | spin_lock(&info->block_group_cache_lock); |
8228 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8229 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8230 | cache_node); | |
1a40e23b ZY |
8231 | rb_erase(&block_group->cache_node, |
8232 | &info->block_group_cache_tree); | |
d899e052 YZ |
8233 | spin_unlock(&info->block_group_cache_lock); |
8234 | ||
80eb234a | 8235 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8236 | list_del(&block_group->list); |
80eb234a | 8237 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8238 | |
817d52f8 | 8239 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8240 | wait_block_group_cache_done(block_group); |
817d52f8 | 8241 | |
3c14874a JB |
8242 | /* |
8243 | * We haven't cached this block group, which means we could | |
8244 | * possibly have excluded extents on this block group. | |
8245 | */ | |
36cce922 JB |
8246 | if (block_group->cached == BTRFS_CACHE_NO || |
8247 | block_group->cached == BTRFS_CACHE_ERROR) | |
3c14874a JB |
8248 | free_excluded_extents(info->extent_root, block_group); |
8249 | ||
817d52f8 | 8250 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 8251 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8252 | |
8253 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8254 | } |
8255 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8256 | |
8257 | /* now that all the block groups are freed, go through and | |
8258 | * free all the space_info structs. This is only called during | |
8259 | * the final stages of unmount, and so we know nobody is | |
8260 | * using them. We call synchronize_rcu() once before we start, | |
8261 | * just to be on the safe side. | |
8262 | */ | |
8263 | synchronize_rcu(); | |
8264 | ||
8929ecfa YZ |
8265 | release_global_block_rsv(info); |
8266 | ||
4184ea7f CM |
8267 | while(!list_empty(&info->space_info)) { |
8268 | space_info = list_entry(info->space_info.next, | |
8269 | struct btrfs_space_info, | |
8270 | list); | |
b069e0c3 DS |
8271 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
8272 | if (space_info->bytes_pinned > 0 || | |
8273 | space_info->bytes_reserved > 0 || | |
8274 | space_info->bytes_may_use > 0) { | |
8275 | WARN_ON(1); | |
8276 | dump_space_info(space_info, 0, 0); | |
8277 | } | |
f0486c68 | 8278 | } |
b150a4f1 | 8279 | percpu_counter_destroy(&space_info->total_bytes_pinned); |
4184ea7f CM |
8280 | list_del(&space_info->list); |
8281 | kfree(space_info); | |
8282 | } | |
1a40e23b ZY |
8283 | return 0; |
8284 | } | |
8285 | ||
b742bb82 YZ |
8286 | static void __link_block_group(struct btrfs_space_info *space_info, |
8287 | struct btrfs_block_group_cache *cache) | |
8288 | { | |
8289 | int index = get_block_group_index(cache); | |
8290 | ||
8291 | down_write(&space_info->groups_sem); | |
8292 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8293 | up_write(&space_info->groups_sem); | |
8294 | } | |
8295 | ||
9078a3e1 CM |
8296 | int btrfs_read_block_groups(struct btrfs_root *root) |
8297 | { | |
8298 | struct btrfs_path *path; | |
8299 | int ret; | |
9078a3e1 | 8300 | struct btrfs_block_group_cache *cache; |
be744175 | 8301 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8302 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8303 | struct btrfs_key key; |
8304 | struct btrfs_key found_key; | |
5f39d397 | 8305 | struct extent_buffer *leaf; |
0af3d00b JB |
8306 | int need_clear = 0; |
8307 | u64 cache_gen; | |
96b5179d | 8308 | |
be744175 | 8309 | root = info->extent_root; |
9078a3e1 | 8310 | key.objectid = 0; |
0b86a832 | 8311 | key.offset = 0; |
9078a3e1 | 8312 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8313 | path = btrfs_alloc_path(); |
8314 | if (!path) | |
8315 | return -ENOMEM; | |
026fd317 | 8316 | path->reada = 1; |
9078a3e1 | 8317 | |
6c41761f | 8318 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 8319 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 8320 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 8321 | need_clear = 1; |
88c2ba3b JB |
8322 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8323 | need_clear = 1; | |
0af3d00b | 8324 | |
d397712b | 8325 | while (1) { |
0b86a832 | 8326 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8327 | if (ret > 0) |
8328 | break; | |
0b86a832 CM |
8329 | if (ret != 0) |
8330 | goto error; | |
5f39d397 CM |
8331 | leaf = path->nodes[0]; |
8332 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 8333 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 8334 | if (!cache) { |
0b86a832 | 8335 | ret = -ENOMEM; |
f0486c68 | 8336 | goto error; |
9078a3e1 | 8337 | } |
34d52cb6 LZ |
8338 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8339 | GFP_NOFS); | |
8340 | if (!cache->free_space_ctl) { | |
8341 | kfree(cache); | |
8342 | ret = -ENOMEM; | |
8343 | goto error; | |
8344 | } | |
3e1ad54f | 8345 | |
d2fb3437 | 8346 | atomic_set(&cache->count, 1); |
c286ac48 | 8347 | spin_lock_init(&cache->lock); |
817d52f8 | 8348 | cache->fs_info = info; |
0f9dd46c | 8349 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8350 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 8351 | |
cf7c1ef6 LB |
8352 | if (need_clear) { |
8353 | /* | |
8354 | * When we mount with old space cache, we need to | |
8355 | * set BTRFS_DC_CLEAR and set dirty flag. | |
8356 | * | |
8357 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
8358 | * truncate the old free space cache inode and | |
8359 | * setup a new one. | |
8360 | * b) Setting 'dirty flag' makes sure that we flush | |
8361 | * the new space cache info onto disk. | |
8362 | */ | |
0af3d00b | 8363 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
8364 | if (btrfs_test_opt(root, SPACE_CACHE)) |
8365 | cache->dirty = 1; | |
8366 | } | |
0af3d00b | 8367 | |
5f39d397 CM |
8368 | read_extent_buffer(leaf, &cache->item, |
8369 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8370 | sizeof(cache->item)); | |
9078a3e1 | 8371 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 8372 | |
9078a3e1 | 8373 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 8374 | btrfs_release_path(path); |
0b86a832 | 8375 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 | 8376 | cache->sectorsize = root->sectorsize; |
53b381b3 DW |
8377 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8378 | &root->fs_info->mapping_tree, | |
8379 | found_key.objectid); | |
34d52cb6 LZ |
8380 | btrfs_init_free_space_ctl(cache); |
8381 | ||
3c14874a JB |
8382 | /* |
8383 | * We need to exclude the super stripes now so that the space | |
8384 | * info has super bytes accounted for, otherwise we'll think | |
8385 | * we have more space than we actually do. | |
8386 | */ | |
835d974f JB |
8387 | ret = exclude_super_stripes(root, cache); |
8388 | if (ret) { | |
8389 | /* | |
8390 | * We may have excluded something, so call this just in | |
8391 | * case. | |
8392 | */ | |
8393 | free_excluded_extents(root, cache); | |
8394 | kfree(cache->free_space_ctl); | |
8395 | kfree(cache); | |
8396 | goto error; | |
8397 | } | |
3c14874a | 8398 | |
817d52f8 JB |
8399 | /* |
8400 | * check for two cases, either we are full, and therefore | |
8401 | * don't need to bother with the caching work since we won't | |
8402 | * find any space, or we are empty, and we can just add all | |
8403 | * the space in and be done with it. This saves us _alot_ of | |
8404 | * time, particularly in the full case. | |
8405 | */ | |
8406 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8407 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8408 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8409 | free_excluded_extents(root, cache); |
817d52f8 | 8410 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8411 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8412 | cache->cached = BTRFS_CACHE_FINISHED; |
8413 | add_new_free_space(cache, root->fs_info, | |
8414 | found_key.objectid, | |
8415 | found_key.objectid + | |
8416 | found_key.offset); | |
11833d66 | 8417 | free_excluded_extents(root, cache); |
817d52f8 | 8418 | } |
96b5179d | 8419 | |
8c579fe7 JB |
8420 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8421 | if (ret) { | |
8422 | btrfs_remove_free_space_cache(cache); | |
8423 | btrfs_put_block_group(cache); | |
8424 | goto error; | |
8425 | } | |
8426 | ||
6324fbf3 CM |
8427 | ret = update_space_info(info, cache->flags, found_key.offset, |
8428 | btrfs_block_group_used(&cache->item), | |
8429 | &space_info); | |
8c579fe7 JB |
8430 | if (ret) { |
8431 | btrfs_remove_free_space_cache(cache); | |
8432 | spin_lock(&info->block_group_cache_lock); | |
8433 | rb_erase(&cache->cache_node, | |
8434 | &info->block_group_cache_tree); | |
8435 | spin_unlock(&info->block_group_cache_lock); | |
8436 | btrfs_put_block_group(cache); | |
8437 | goto error; | |
8438 | } | |
8439 | ||
6324fbf3 | 8440 | cache->space_info = space_info; |
1b2da372 | 8441 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8442 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8443 | spin_unlock(&cache->space_info->lock); |
8444 | ||
b742bb82 | 8445 | __link_block_group(space_info, cache); |
0f9dd46c | 8446 | |
75ccf47d | 8447 | set_avail_alloc_bits(root->fs_info, cache->flags); |
2b82032c | 8448 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8449 | set_block_group_ro(cache, 1); |
9078a3e1 | 8450 | } |
b742bb82 YZ |
8451 | |
8452 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8453 | if (!(get_alloc_profile(root, space_info->flags) & | |
8454 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8455 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8456 | BTRFS_BLOCK_GROUP_RAID5 | |
8457 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8458 | BTRFS_BLOCK_GROUP_DUP))) |
8459 | continue; | |
8460 | /* | |
8461 | * avoid allocating from un-mirrored block group if there are | |
8462 | * mirrored block groups. | |
8463 | */ | |
1095cc0d | 8464 | list_for_each_entry(cache, |
8465 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
8466 | list) | |
199c36ea | 8467 | set_block_group_ro(cache, 1); |
1095cc0d | 8468 | list_for_each_entry(cache, |
8469 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
8470 | list) | |
199c36ea | 8471 | set_block_group_ro(cache, 1); |
9078a3e1 | 8472 | } |
f0486c68 YZ |
8473 | |
8474 | init_global_block_rsv(info); | |
0b86a832 CM |
8475 | ret = 0; |
8476 | error: | |
9078a3e1 | 8477 | btrfs_free_path(path); |
0b86a832 | 8478 | return ret; |
9078a3e1 | 8479 | } |
6324fbf3 | 8480 | |
ea658bad JB |
8481 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8482 | struct btrfs_root *root) | |
8483 | { | |
8484 | struct btrfs_block_group_cache *block_group, *tmp; | |
8485 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8486 | struct btrfs_block_group_item item; | |
8487 | struct btrfs_key key; | |
8488 | int ret = 0; | |
8489 | ||
8490 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8491 | new_bg_list) { | |
8492 | list_del_init(&block_group->new_bg_list); | |
8493 | ||
8494 | if (ret) | |
8495 | continue; | |
8496 | ||
8497 | spin_lock(&block_group->lock); | |
8498 | memcpy(&item, &block_group->item, sizeof(item)); | |
8499 | memcpy(&key, &block_group->key, sizeof(key)); | |
8500 | spin_unlock(&block_group->lock); | |
8501 | ||
8502 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8503 | sizeof(item)); | |
8504 | if (ret) | |
8505 | btrfs_abort_transaction(trans, extent_root, ret); | |
6df9a95e JB |
8506 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
8507 | key.objectid, key.offset); | |
8508 | if (ret) | |
8509 | btrfs_abort_transaction(trans, extent_root, ret); | |
ea658bad JB |
8510 | } |
8511 | } | |
8512 | ||
6324fbf3 CM |
8513 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8514 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8515 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8516 | u64 size) |
8517 | { | |
8518 | int ret; | |
6324fbf3 CM |
8519 | struct btrfs_root *extent_root; |
8520 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8521 | |
8522 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8523 | |
12fcfd22 | 8524 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8525 | |
8f18cf13 | 8526 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8527 | if (!cache) |
8528 | return -ENOMEM; | |
34d52cb6 LZ |
8529 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8530 | GFP_NOFS); | |
8531 | if (!cache->free_space_ctl) { | |
8532 | kfree(cache); | |
8533 | return -ENOMEM; | |
8534 | } | |
0f9dd46c | 8535 | |
e17cade2 | 8536 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8537 | cache->key.offset = size; |
d2fb3437 | 8538 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8539 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8540 | cache->fs_info = root->fs_info; |
53b381b3 DW |
8541 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8542 | &root->fs_info->mapping_tree, | |
8543 | chunk_offset); | |
96303081 | 8544 | |
d2fb3437 | 8545 | atomic_set(&cache->count, 1); |
c286ac48 | 8546 | spin_lock_init(&cache->lock); |
0f9dd46c | 8547 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8548 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 8549 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 8550 | |
34d52cb6 LZ |
8551 | btrfs_init_free_space_ctl(cache); |
8552 | ||
6324fbf3 | 8553 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8554 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8555 | cache->flags = type; | |
8556 | btrfs_set_block_group_flags(&cache->item, type); | |
8557 | ||
11833d66 | 8558 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8559 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8560 | ret = exclude_super_stripes(root, cache); |
8561 | if (ret) { | |
8562 | /* | |
8563 | * We may have excluded something, so call this just in | |
8564 | * case. | |
8565 | */ | |
8566 | free_excluded_extents(root, cache); | |
8567 | kfree(cache->free_space_ctl); | |
8568 | kfree(cache); | |
8569 | return ret; | |
8570 | } | |
96303081 | 8571 | |
817d52f8 JB |
8572 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8573 | chunk_offset + size); | |
8574 | ||
11833d66 YZ |
8575 | free_excluded_extents(root, cache); |
8576 | ||
8c579fe7 JB |
8577 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8578 | if (ret) { | |
8579 | btrfs_remove_free_space_cache(cache); | |
8580 | btrfs_put_block_group(cache); | |
8581 | return ret; | |
8582 | } | |
8583 | ||
6324fbf3 CM |
8584 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8585 | &cache->space_info); | |
8c579fe7 JB |
8586 | if (ret) { |
8587 | btrfs_remove_free_space_cache(cache); | |
8588 | spin_lock(&root->fs_info->block_group_cache_lock); | |
8589 | rb_erase(&cache->cache_node, | |
8590 | &root->fs_info->block_group_cache_tree); | |
8591 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
8592 | btrfs_put_block_group(cache); | |
8593 | return ret; | |
8594 | } | |
c7c144db | 8595 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8596 | |
8597 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8598 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8599 | spin_unlock(&cache->space_info->lock); |
8600 | ||
b742bb82 | 8601 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8602 | |
ea658bad | 8603 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8604 | |
d18a2c44 | 8605 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8606 | |
6324fbf3 CM |
8607 | return 0; |
8608 | } | |
1a40e23b | 8609 | |
10ea00f5 ID |
8610 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8611 | { | |
899c81ea ID |
8612 | u64 extra_flags = chunk_to_extended(flags) & |
8613 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8614 | |
de98ced9 | 8615 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8616 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8617 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8618 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8619 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8620 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8621 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8622 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8623 | } |
8624 | ||
1a40e23b ZY |
8625 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8626 | struct btrfs_root *root, u64 group_start) | |
8627 | { | |
8628 | struct btrfs_path *path; | |
8629 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8630 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8631 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8632 | struct btrfs_key key; |
0af3d00b | 8633 | struct inode *inode; |
1a40e23b | 8634 | int ret; |
10ea00f5 | 8635 | int index; |
89a55897 | 8636 | int factor; |
1a40e23b | 8637 | |
1a40e23b ZY |
8638 | root = root->fs_info->extent_root; |
8639 | ||
8640 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8641 | BUG_ON(!block_group); | |
c146afad | 8642 | BUG_ON(!block_group->ro); |
1a40e23b | 8643 | |
9f7c43c9 | 8644 | /* |
8645 | * Free the reserved super bytes from this block group before | |
8646 | * remove it. | |
8647 | */ | |
8648 | free_excluded_extents(root, block_group); | |
8649 | ||
1a40e23b | 8650 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8651 | index = get_block_group_index(block_group); |
89a55897 JB |
8652 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8653 | BTRFS_BLOCK_GROUP_RAID1 | | |
8654 | BTRFS_BLOCK_GROUP_RAID10)) | |
8655 | factor = 2; | |
8656 | else | |
8657 | factor = 1; | |
1a40e23b | 8658 | |
44fb5511 CM |
8659 | /* make sure this block group isn't part of an allocation cluster */ |
8660 | cluster = &root->fs_info->data_alloc_cluster; | |
8661 | spin_lock(&cluster->refill_lock); | |
8662 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8663 | spin_unlock(&cluster->refill_lock); | |
8664 | ||
8665 | /* | |
8666 | * make sure this block group isn't part of a metadata | |
8667 | * allocation cluster | |
8668 | */ | |
8669 | cluster = &root->fs_info->meta_alloc_cluster; | |
8670 | spin_lock(&cluster->refill_lock); | |
8671 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8672 | spin_unlock(&cluster->refill_lock); | |
8673 | ||
1a40e23b | 8674 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8675 | if (!path) { |
8676 | ret = -ENOMEM; | |
8677 | goto out; | |
8678 | } | |
1a40e23b | 8679 | |
10b2f34d | 8680 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8681 | if (!IS_ERR(inode)) { |
b532402e | 8682 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8683 | if (ret) { |
8684 | btrfs_add_delayed_iput(inode); | |
8685 | goto out; | |
8686 | } | |
0af3d00b JB |
8687 | clear_nlink(inode); |
8688 | /* One for the block groups ref */ | |
8689 | spin_lock(&block_group->lock); | |
8690 | if (block_group->iref) { | |
8691 | block_group->iref = 0; | |
8692 | block_group->inode = NULL; | |
8693 | spin_unlock(&block_group->lock); | |
8694 | iput(inode); | |
8695 | } else { | |
8696 | spin_unlock(&block_group->lock); | |
8697 | } | |
8698 | /* One for our lookup ref */ | |
455757c3 | 8699 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8700 | } |
8701 | ||
8702 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8703 | key.offset = block_group->key.objectid; | |
8704 | key.type = 0; | |
8705 | ||
8706 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8707 | if (ret < 0) | |
8708 | goto out; | |
8709 | if (ret > 0) | |
b3b4aa74 | 8710 | btrfs_release_path(path); |
0af3d00b JB |
8711 | if (ret == 0) { |
8712 | ret = btrfs_del_item(trans, tree_root, path); | |
8713 | if (ret) | |
8714 | goto out; | |
b3b4aa74 | 8715 | btrfs_release_path(path); |
0af3d00b JB |
8716 | } |
8717 | ||
3dfdb934 | 8718 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8719 | rb_erase(&block_group->cache_node, |
8720 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8721 | |
8722 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8723 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8724 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8725 | |
80eb234a | 8726 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8727 | /* |
8728 | * we must use list_del_init so people can check to see if they | |
8729 | * are still on the list after taking the semaphore | |
8730 | */ | |
8731 | list_del_init(&block_group->list); | |
10ea00f5 ID |
8732 | if (list_empty(&block_group->space_info->block_groups[index])) |
8733 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
80eb234a | 8734 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8735 | |
817d52f8 | 8736 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8737 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8738 | |
8739 | btrfs_remove_free_space_cache(block_group); | |
8740 | ||
c146afad YZ |
8741 | spin_lock(&block_group->space_info->lock); |
8742 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8743 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8744 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8745 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8746 | |
0af3d00b JB |
8747 | memcpy(&key, &block_group->key, sizeof(key)); |
8748 | ||
283bb197 | 8749 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8750 | |
fa9c0d79 CM |
8751 | btrfs_put_block_group(block_group); |
8752 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8753 | |
8754 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8755 | if (ret > 0) | |
8756 | ret = -EIO; | |
8757 | if (ret < 0) | |
8758 | goto out; | |
8759 | ||
8760 | ret = btrfs_del_item(trans, root, path); | |
8761 | out: | |
8762 | btrfs_free_path(path); | |
8763 | return ret; | |
8764 | } | |
acce952b | 8765 | |
c59021f8 | 8766 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8767 | { | |
8768 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8769 | struct btrfs_super_block *disk_super; |
8770 | u64 features; | |
8771 | u64 flags; | |
8772 | int mixed = 0; | |
c59021f8 | 8773 | int ret; |
8774 | ||
6c41761f | 8775 | disk_super = fs_info->super_copy; |
1aba86d6 | 8776 | if (!btrfs_super_root(disk_super)) |
8777 | return 1; | |
c59021f8 | 8778 | |
1aba86d6 | 8779 | features = btrfs_super_incompat_flags(disk_super); |
8780 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8781 | mixed = 1; | |
c59021f8 | 8782 | |
1aba86d6 | 8783 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8784 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8785 | if (ret) |
1aba86d6 | 8786 | goto out; |
c59021f8 | 8787 | |
1aba86d6 | 8788 | if (mixed) { |
8789 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8790 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8791 | } else { | |
8792 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8793 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8794 | if (ret) | |
8795 | goto out; | |
8796 | ||
8797 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8798 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8799 | } | |
8800 | out: | |
c59021f8 | 8801 | return ret; |
8802 | } | |
8803 | ||
acce952b | 8804 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8805 | { | |
8806 | return unpin_extent_range(root, start, end); | |
8807 | } | |
8808 | ||
8809 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8810 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8811 | { |
5378e607 | 8812 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8813 | } |
f7039b1d LD |
8814 | |
8815 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8816 | { | |
8817 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8818 | struct btrfs_block_group_cache *cache = NULL; | |
8819 | u64 group_trimmed; | |
8820 | u64 start; | |
8821 | u64 end; | |
8822 | u64 trimmed = 0; | |
2cac13e4 | 8823 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8824 | int ret = 0; |
8825 | ||
2cac13e4 LB |
8826 | /* |
8827 | * try to trim all FS space, our block group may start from non-zero. | |
8828 | */ | |
8829 | if (range->len == total_bytes) | |
8830 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8831 | else | |
8832 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8833 | |
8834 | while (cache) { | |
8835 | if (cache->key.objectid >= (range->start + range->len)) { | |
8836 | btrfs_put_block_group(cache); | |
8837 | break; | |
8838 | } | |
8839 | ||
8840 | start = max(range->start, cache->key.objectid); | |
8841 | end = min(range->start + range->len, | |
8842 | cache->key.objectid + cache->key.offset); | |
8843 | ||
8844 | if (end - start >= range->minlen) { | |
8845 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8846 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
8847 | if (ret) { |
8848 | btrfs_put_block_group(cache); | |
8849 | break; | |
8850 | } | |
8851 | ret = wait_block_group_cache_done(cache); | |
8852 | if (ret) { | |
8853 | btrfs_put_block_group(cache); | |
8854 | break; | |
8855 | } | |
f7039b1d LD |
8856 | } |
8857 | ret = btrfs_trim_block_group(cache, | |
8858 | &group_trimmed, | |
8859 | start, | |
8860 | end, | |
8861 | range->minlen); | |
8862 | ||
8863 | trimmed += group_trimmed; | |
8864 | if (ret) { | |
8865 | btrfs_put_block_group(cache); | |
8866 | break; | |
8867 | } | |
8868 | } | |
8869 | ||
8870 | cache = next_block_group(fs_info->tree_root, cache); | |
8871 | } | |
8872 | ||
8873 | range->len = trimmed; | |
8874 | return ret; | |
8875 | } |