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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
b150a4f1 | 27 | #include <linux/percpu_counter.h> |
74493f7a | 28 | #include "hash.h" |
fec577fb CM |
29 | #include "ctree.h" |
30 | #include "disk-io.h" | |
31 | #include "print-tree.h" | |
e089f05c | 32 | #include "transaction.h" |
0b86a832 | 33 | #include "volumes.h" |
53b381b3 | 34 | #include "raid56.h" |
925baedd | 35 | #include "locking.h" |
fa9c0d79 | 36 | #include "free-space-cache.h" |
3fed40cc | 37 | #include "math.h" |
6ab0a202 | 38 | #include "sysfs.h" |
fec577fb | 39 | |
709c0486 AJ |
40 | #undef SCRAMBLE_DELAYED_REFS |
41 | ||
9e622d6b MX |
42 | /* |
43 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
45 | * if we really need one. | |
46 | * | |
0e4f8f88 CM |
47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
48 | * if we have very few chunks already allocated. This is | |
49 | * used as part of the clustering code to help make sure | |
50 | * we have a good pool of storage to cluster in, without | |
51 | * filling the FS with empty chunks | |
52 | * | |
9e622d6b MX |
53 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
54 | * | |
0e4f8f88 CM |
55 | */ |
56 | enum { | |
57 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
58 | CHUNK_ALLOC_LIMITED = 1, |
59 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
60 | }; |
61 | ||
fb25e914 JB |
62 | /* |
63 | * Control how reservations are dealt with. | |
64 | * | |
65 | * RESERVE_FREE - freeing a reservation. | |
66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
67 | * ENOSPC accounting | |
68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
69 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
70 | */ | |
71 | enum { | |
72 | RESERVE_FREE = 0, | |
73 | RESERVE_ALLOC = 1, | |
74 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
75 | }; | |
76 | ||
c53d613e | 77 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 78 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
79 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
80 | struct btrfs_root *root, | |
81 | u64 bytenr, u64 num_bytes, u64 parent, | |
82 | u64 root_objectid, u64 owner_objectid, | |
83 | u64 owner_offset, int refs_to_drop, | |
84 | struct btrfs_delayed_extent_op *extra_op); | |
85 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
86 | struct extent_buffer *leaf, | |
87 | struct btrfs_extent_item *ei); | |
88 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
89 | struct btrfs_root *root, | |
90 | u64 parent, u64 root_objectid, | |
91 | u64 flags, u64 owner, u64 offset, | |
92 | struct btrfs_key *ins, int ref_mod); | |
93 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
94 | struct btrfs_root *root, | |
95 | u64 parent, u64 root_objectid, | |
96 | u64 flags, struct btrfs_disk_key *key, | |
97 | int level, struct btrfs_key *ins); | |
6a63209f | 98 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
99 | struct btrfs_root *extent_root, u64 flags, |
100 | int force); | |
11833d66 YZ |
101 | static int find_next_key(struct btrfs_path *path, int level, |
102 | struct btrfs_key *key); | |
9ed74f2d JB |
103 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
104 | int dump_block_groups); | |
fb25e914 JB |
105 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
106 | u64 num_bytes, int reserve); | |
5d80366e JB |
107 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
108 | u64 num_bytes); | |
48a3b636 ES |
109 | int btrfs_pin_extent(struct btrfs_root *root, |
110 | u64 bytenr, u64 num_bytes, int reserved); | |
6a63209f | 111 | |
817d52f8 JB |
112 | static noinline int |
113 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
114 | { | |
115 | smp_mb(); | |
36cce922 JB |
116 | return cache->cached == BTRFS_CACHE_FINISHED || |
117 | cache->cached == BTRFS_CACHE_ERROR; | |
817d52f8 JB |
118 | } |
119 | ||
0f9dd46c JB |
120 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
121 | { | |
122 | return (cache->flags & bits) == bits; | |
123 | } | |
124 | ||
62a45b60 | 125 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
126 | { |
127 | atomic_inc(&cache->count); | |
128 | } | |
129 | ||
130 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
131 | { | |
f0486c68 YZ |
132 | if (atomic_dec_and_test(&cache->count)) { |
133 | WARN_ON(cache->pinned > 0); | |
134 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 135 | kfree(cache->free_space_ctl); |
11dfe35a | 136 | kfree(cache); |
f0486c68 | 137 | } |
11dfe35a JB |
138 | } |
139 | ||
0f9dd46c JB |
140 | /* |
141 | * this adds the block group to the fs_info rb tree for the block group | |
142 | * cache | |
143 | */ | |
b2950863 | 144 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
145 | struct btrfs_block_group_cache *block_group) |
146 | { | |
147 | struct rb_node **p; | |
148 | struct rb_node *parent = NULL; | |
149 | struct btrfs_block_group_cache *cache; | |
150 | ||
151 | spin_lock(&info->block_group_cache_lock); | |
152 | p = &info->block_group_cache_tree.rb_node; | |
153 | ||
154 | while (*p) { | |
155 | parent = *p; | |
156 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
157 | cache_node); | |
158 | if (block_group->key.objectid < cache->key.objectid) { | |
159 | p = &(*p)->rb_left; | |
160 | } else if (block_group->key.objectid > cache->key.objectid) { | |
161 | p = &(*p)->rb_right; | |
162 | } else { | |
163 | spin_unlock(&info->block_group_cache_lock); | |
164 | return -EEXIST; | |
165 | } | |
166 | } | |
167 | ||
168 | rb_link_node(&block_group->cache_node, parent, p); | |
169 | rb_insert_color(&block_group->cache_node, | |
170 | &info->block_group_cache_tree); | |
a1897fdd LB |
171 | |
172 | if (info->first_logical_byte > block_group->key.objectid) | |
173 | info->first_logical_byte = block_group->key.objectid; | |
174 | ||
0f9dd46c JB |
175 | spin_unlock(&info->block_group_cache_lock); |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * This will return the block group at or after bytenr if contains is 0, else | |
182 | * it will return the block group that contains the bytenr | |
183 | */ | |
184 | static struct btrfs_block_group_cache * | |
185 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
186 | int contains) | |
187 | { | |
188 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
189 | struct rb_node *n; | |
190 | u64 end, start; | |
191 | ||
192 | spin_lock(&info->block_group_cache_lock); | |
193 | n = info->block_group_cache_tree.rb_node; | |
194 | ||
195 | while (n) { | |
196 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
197 | cache_node); | |
198 | end = cache->key.objectid + cache->key.offset - 1; | |
199 | start = cache->key.objectid; | |
200 | ||
201 | if (bytenr < start) { | |
202 | if (!contains && (!ret || start < ret->key.objectid)) | |
203 | ret = cache; | |
204 | n = n->rb_left; | |
205 | } else if (bytenr > start) { | |
206 | if (contains && bytenr <= end) { | |
207 | ret = cache; | |
208 | break; | |
209 | } | |
210 | n = n->rb_right; | |
211 | } else { | |
212 | ret = cache; | |
213 | break; | |
214 | } | |
215 | } | |
a1897fdd | 216 | if (ret) { |
11dfe35a | 217 | btrfs_get_block_group(ret); |
a1897fdd LB |
218 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
219 | info->first_logical_byte = ret->key.objectid; | |
220 | } | |
0f9dd46c JB |
221 | spin_unlock(&info->block_group_cache_lock); |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
11833d66 YZ |
226 | static int add_excluded_extent(struct btrfs_root *root, |
227 | u64 start, u64 num_bytes) | |
817d52f8 | 228 | { |
11833d66 YZ |
229 | u64 end = start + num_bytes - 1; |
230 | set_extent_bits(&root->fs_info->freed_extents[0], | |
231 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
232 | set_extent_bits(&root->fs_info->freed_extents[1], | |
233 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
234 | return 0; | |
235 | } | |
817d52f8 | 236 | |
11833d66 YZ |
237 | static void free_excluded_extents(struct btrfs_root *root, |
238 | struct btrfs_block_group_cache *cache) | |
239 | { | |
240 | u64 start, end; | |
817d52f8 | 241 | |
11833d66 YZ |
242 | start = cache->key.objectid; |
243 | end = start + cache->key.offset - 1; | |
244 | ||
245 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
246 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
247 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
248 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
249 | } |
250 | ||
11833d66 YZ |
251 | static int exclude_super_stripes(struct btrfs_root *root, |
252 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 253 | { |
817d52f8 JB |
254 | u64 bytenr; |
255 | u64 *logical; | |
256 | int stripe_len; | |
257 | int i, nr, ret; | |
258 | ||
06b2331f YZ |
259 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
260 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
261 | cache->bytes_super += stripe_len; | |
262 | ret = add_excluded_extent(root, cache->key.objectid, | |
263 | stripe_len); | |
835d974f JB |
264 | if (ret) |
265 | return ret; | |
06b2331f YZ |
266 | } |
267 | ||
817d52f8 JB |
268 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
269 | bytenr = btrfs_sb_offset(i); | |
270 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
271 | cache->key.objectid, bytenr, | |
272 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
273 | if (ret) |
274 | return ret; | |
11833d66 | 275 | |
817d52f8 | 276 | while (nr--) { |
51bf5f0b JB |
277 | u64 start, len; |
278 | ||
279 | if (logical[nr] > cache->key.objectid + | |
280 | cache->key.offset) | |
281 | continue; | |
282 | ||
283 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
284 | continue; | |
285 | ||
286 | start = logical[nr]; | |
287 | if (start < cache->key.objectid) { | |
288 | start = cache->key.objectid; | |
289 | len = (logical[nr] + stripe_len) - start; | |
290 | } else { | |
291 | len = min_t(u64, stripe_len, | |
292 | cache->key.objectid + | |
293 | cache->key.offset - start); | |
294 | } | |
295 | ||
296 | cache->bytes_super += len; | |
297 | ret = add_excluded_extent(root, start, len); | |
835d974f JB |
298 | if (ret) { |
299 | kfree(logical); | |
300 | return ret; | |
301 | } | |
817d52f8 | 302 | } |
11833d66 | 303 | |
817d52f8 JB |
304 | kfree(logical); |
305 | } | |
817d52f8 JB |
306 | return 0; |
307 | } | |
308 | ||
11833d66 YZ |
309 | static struct btrfs_caching_control * |
310 | get_caching_control(struct btrfs_block_group_cache *cache) | |
311 | { | |
312 | struct btrfs_caching_control *ctl; | |
313 | ||
314 | spin_lock(&cache->lock); | |
315 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
316 | spin_unlock(&cache->lock); | |
317 | return NULL; | |
318 | } | |
319 | ||
dde5abee JB |
320 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
321 | if (!cache->caching_ctl) { | |
322 | spin_unlock(&cache->lock); | |
11833d66 YZ |
323 | return NULL; |
324 | } | |
325 | ||
326 | ctl = cache->caching_ctl; | |
327 | atomic_inc(&ctl->count); | |
328 | spin_unlock(&cache->lock); | |
329 | return ctl; | |
330 | } | |
331 | ||
332 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
333 | { | |
334 | if (atomic_dec_and_test(&ctl->count)) | |
335 | kfree(ctl); | |
336 | } | |
337 | ||
0f9dd46c JB |
338 | /* |
339 | * this is only called by cache_block_group, since we could have freed extents | |
340 | * we need to check the pinned_extents for any extents that can't be used yet | |
341 | * since their free space will be released as soon as the transaction commits. | |
342 | */ | |
817d52f8 | 343 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
344 | struct btrfs_fs_info *info, u64 start, u64 end) |
345 | { | |
817d52f8 | 346 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
347 | int ret; |
348 | ||
349 | while (start < end) { | |
11833d66 | 350 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 351 | &extent_start, &extent_end, |
e6138876 JB |
352 | EXTENT_DIRTY | EXTENT_UPTODATE, |
353 | NULL); | |
0f9dd46c JB |
354 | if (ret) |
355 | break; | |
356 | ||
06b2331f | 357 | if (extent_start <= start) { |
0f9dd46c JB |
358 | start = extent_end + 1; |
359 | } else if (extent_start > start && extent_start < end) { | |
360 | size = extent_start - start; | |
817d52f8 | 361 | total_added += size; |
ea6a478e JB |
362 | ret = btrfs_add_free_space(block_group, start, |
363 | size); | |
79787eaa | 364 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
365 | start = extent_end + 1; |
366 | } else { | |
367 | break; | |
368 | } | |
369 | } | |
370 | ||
371 | if (start < end) { | |
372 | size = end - start; | |
817d52f8 | 373 | total_added += size; |
ea6a478e | 374 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 375 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
376 | } |
377 | ||
817d52f8 | 378 | return total_added; |
0f9dd46c JB |
379 | } |
380 | ||
d458b054 | 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 | 421 | /* need to make sure the commit_root doesn't disappear */ |
9e351cc8 | 422 | down_read(&fs_info->commit_root_sem); |
013f1b12 | 423 | |
52ee28d2 | 424 | next: |
11833d66 | 425 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 426 | if (ret < 0) |
ef8bbdfe | 427 | goto err; |
a512bbf8 | 428 | |
11833d66 YZ |
429 | leaf = path->nodes[0]; |
430 | nritems = btrfs_header_nritems(leaf); | |
431 | ||
d397712b | 432 | while (1) { |
7841cb28 | 433 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 434 | last = (u64)-1; |
817d52f8 | 435 | break; |
f25784b3 | 436 | } |
817d52f8 | 437 | |
11833d66 YZ |
438 | if (path->slots[0] < nritems) { |
439 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
440 | } else { | |
441 | ret = find_next_key(path, 0, &key); | |
442 | if (ret) | |
e37c9e69 | 443 | break; |
817d52f8 | 444 | |
c9ea7b24 | 445 | if (need_resched() || |
9e351cc8 | 446 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
589d8ade | 447 | caching_ctl->progress = last; |
ff5714cc | 448 | btrfs_release_path(path); |
9e351cc8 | 449 | up_read(&fs_info->commit_root_sem); |
589d8ade | 450 | mutex_unlock(&caching_ctl->mutex); |
11833d66 | 451 | cond_resched(); |
589d8ade JB |
452 | goto again; |
453 | } | |
0a3896d0 JB |
454 | |
455 | ret = btrfs_next_leaf(extent_root, path); | |
456 | if (ret < 0) | |
457 | goto err; | |
458 | if (ret) | |
459 | break; | |
589d8ade JB |
460 | leaf = path->nodes[0]; |
461 | nritems = btrfs_header_nritems(leaf); | |
462 | continue; | |
11833d66 | 463 | } |
817d52f8 | 464 | |
52ee28d2 LB |
465 | if (key.objectid < last) { |
466 | key.objectid = last; | |
467 | key.offset = 0; | |
468 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
469 | ||
470 | caching_ctl->progress = last; | |
471 | btrfs_release_path(path); | |
472 | goto next; | |
473 | } | |
474 | ||
11833d66 YZ |
475 | if (key.objectid < block_group->key.objectid) { |
476 | path->slots[0]++; | |
817d52f8 | 477 | continue; |
e37c9e69 | 478 | } |
0f9dd46c | 479 | |
e37c9e69 | 480 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 481 | block_group->key.offset) |
e37c9e69 | 482 | break; |
7d7d6068 | 483 | |
3173a18f JB |
484 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
485 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
817d52f8 JB |
486 | total_found += add_new_free_space(block_group, |
487 | fs_info, last, | |
488 | key.objectid); | |
3173a18f JB |
489 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
490 | last = key.objectid + | |
491 | fs_info->tree_root->leafsize; | |
492 | else | |
493 | last = key.objectid + key.offset; | |
817d52f8 | 494 | |
11833d66 YZ |
495 | if (total_found > (1024 * 1024 * 2)) { |
496 | total_found = 0; | |
497 | wake_up(&caching_ctl->wait); | |
498 | } | |
817d52f8 | 499 | } |
e37c9e69 CM |
500 | path->slots[0]++; |
501 | } | |
817d52f8 | 502 | ret = 0; |
e37c9e69 | 503 | |
817d52f8 JB |
504 | total_found += add_new_free_space(block_group, fs_info, last, |
505 | block_group->key.objectid + | |
506 | block_group->key.offset); | |
11833d66 | 507 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
508 | |
509 | spin_lock(&block_group->lock); | |
11833d66 | 510 | block_group->caching_ctl = NULL; |
817d52f8 JB |
511 | block_group->cached = BTRFS_CACHE_FINISHED; |
512 | spin_unlock(&block_group->lock); | |
0f9dd46c | 513 | |
54aa1f4d | 514 | err: |
e37c9e69 | 515 | btrfs_free_path(path); |
9e351cc8 | 516 | up_read(&fs_info->commit_root_sem); |
817d52f8 | 517 | |
11833d66 YZ |
518 | free_excluded_extents(extent_root, block_group); |
519 | ||
520 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 521 | out: |
36cce922 JB |
522 | if (ret) { |
523 | spin_lock(&block_group->lock); | |
524 | block_group->caching_ctl = NULL; | |
525 | block_group->cached = BTRFS_CACHE_ERROR; | |
526 | spin_unlock(&block_group->lock); | |
527 | } | |
11833d66 YZ |
528 | wake_up(&caching_ctl->wait); |
529 | ||
530 | put_caching_control(caching_ctl); | |
11dfe35a | 531 | btrfs_put_block_group(block_group); |
817d52f8 JB |
532 | } |
533 | ||
9d66e233 | 534 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 535 | int load_cache_only) |
817d52f8 | 536 | { |
291c7d2f | 537 | DEFINE_WAIT(wait); |
11833d66 YZ |
538 | struct btrfs_fs_info *fs_info = cache->fs_info; |
539 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
540 | int ret = 0; |
541 | ||
291c7d2f | 542 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
543 | if (!caching_ctl) |
544 | return -ENOMEM; | |
291c7d2f JB |
545 | |
546 | INIT_LIST_HEAD(&caching_ctl->list); | |
547 | mutex_init(&caching_ctl->mutex); | |
548 | init_waitqueue_head(&caching_ctl->wait); | |
549 | caching_ctl->block_group = cache; | |
550 | caching_ctl->progress = cache->key.objectid; | |
551 | atomic_set(&caching_ctl->count, 1); | |
e66f0bb1 | 552 | btrfs_init_work(&caching_ctl->work, caching_thread, NULL, NULL); |
291c7d2f JB |
553 | |
554 | spin_lock(&cache->lock); | |
555 | /* | |
556 | * This should be a rare occasion, but this could happen I think in the | |
557 | * case where one thread starts to load the space cache info, and then | |
558 | * some other thread starts a transaction commit which tries to do an | |
559 | * allocation while the other thread is still loading the space cache | |
560 | * info. The previous loop should have kept us from choosing this block | |
561 | * group, but if we've moved to the state where we will wait on caching | |
562 | * block groups we need to first check if we're doing a fast load here, | |
563 | * so we can wait for it to finish, otherwise we could end up allocating | |
564 | * from a block group who's cache gets evicted for one reason or | |
565 | * another. | |
566 | */ | |
567 | while (cache->cached == BTRFS_CACHE_FAST) { | |
568 | struct btrfs_caching_control *ctl; | |
569 | ||
570 | ctl = cache->caching_ctl; | |
571 | atomic_inc(&ctl->count); | |
572 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
573 | spin_unlock(&cache->lock); | |
574 | ||
575 | schedule(); | |
576 | ||
577 | finish_wait(&ctl->wait, &wait); | |
578 | put_caching_control(ctl); | |
579 | spin_lock(&cache->lock); | |
580 | } | |
581 | ||
582 | if (cache->cached != BTRFS_CACHE_NO) { | |
583 | spin_unlock(&cache->lock); | |
584 | kfree(caching_ctl); | |
11833d66 | 585 | return 0; |
291c7d2f JB |
586 | } |
587 | WARN_ON(cache->caching_ctl); | |
588 | cache->caching_ctl = caching_ctl; | |
589 | cache->cached = BTRFS_CACHE_FAST; | |
590 | spin_unlock(&cache->lock); | |
11833d66 | 591 | |
d53ba474 | 592 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
593 | ret = load_free_space_cache(fs_info, cache); |
594 | ||
595 | spin_lock(&cache->lock); | |
596 | if (ret == 1) { | |
291c7d2f | 597 | cache->caching_ctl = NULL; |
9d66e233 JB |
598 | cache->cached = BTRFS_CACHE_FINISHED; |
599 | cache->last_byte_to_unpin = (u64)-1; | |
600 | } else { | |
291c7d2f JB |
601 | if (load_cache_only) { |
602 | cache->caching_ctl = NULL; | |
603 | cache->cached = BTRFS_CACHE_NO; | |
604 | } else { | |
605 | cache->cached = BTRFS_CACHE_STARTED; | |
606 | } | |
9d66e233 JB |
607 | } |
608 | spin_unlock(&cache->lock); | |
291c7d2f | 609 | wake_up(&caching_ctl->wait); |
3c14874a | 610 | if (ret == 1) { |
291c7d2f | 611 | put_caching_control(caching_ctl); |
3c14874a | 612 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 613 | return 0; |
3c14874a | 614 | } |
291c7d2f JB |
615 | } else { |
616 | /* | |
617 | * We are not going to do the fast caching, set cached to the | |
618 | * appropriate value and wakeup any waiters. | |
619 | */ | |
620 | spin_lock(&cache->lock); | |
621 | if (load_cache_only) { | |
622 | cache->caching_ctl = NULL; | |
623 | cache->cached = BTRFS_CACHE_NO; | |
624 | } else { | |
625 | cache->cached = BTRFS_CACHE_STARTED; | |
626 | } | |
627 | spin_unlock(&cache->lock); | |
628 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
629 | } |
630 | ||
291c7d2f JB |
631 | if (load_cache_only) { |
632 | put_caching_control(caching_ctl); | |
11833d66 | 633 | return 0; |
817d52f8 | 634 | } |
817d52f8 | 635 | |
9e351cc8 | 636 | down_write(&fs_info->commit_root_sem); |
291c7d2f | 637 | atomic_inc(&caching_ctl->count); |
11833d66 | 638 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
9e351cc8 | 639 | up_write(&fs_info->commit_root_sem); |
11833d66 | 640 | |
11dfe35a | 641 | btrfs_get_block_group(cache); |
11833d66 | 642 | |
e66f0bb1 | 643 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 644 | |
ef8bbdfe | 645 | return ret; |
e37c9e69 CM |
646 | } |
647 | ||
0f9dd46c JB |
648 | /* |
649 | * return the block group that starts at or after bytenr | |
650 | */ | |
d397712b CM |
651 | static struct btrfs_block_group_cache * |
652 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 653 | { |
0f9dd46c | 654 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 655 | |
0f9dd46c | 656 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 657 | |
0f9dd46c | 658 | return cache; |
0ef3e66b CM |
659 | } |
660 | ||
0f9dd46c | 661 | /* |
9f55684c | 662 | * return the block group that contains the given bytenr |
0f9dd46c | 663 | */ |
d397712b CM |
664 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
665 | struct btrfs_fs_info *info, | |
666 | u64 bytenr) | |
be744175 | 667 | { |
0f9dd46c | 668 | struct btrfs_block_group_cache *cache; |
be744175 | 669 | |
0f9dd46c | 670 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 671 | |
0f9dd46c | 672 | return cache; |
be744175 | 673 | } |
0b86a832 | 674 | |
0f9dd46c JB |
675 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
676 | u64 flags) | |
6324fbf3 | 677 | { |
0f9dd46c | 678 | struct list_head *head = &info->space_info; |
0f9dd46c | 679 | struct btrfs_space_info *found; |
4184ea7f | 680 | |
52ba6929 | 681 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 682 | |
4184ea7f CM |
683 | rcu_read_lock(); |
684 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 685 | if (found->flags & flags) { |
4184ea7f | 686 | rcu_read_unlock(); |
0f9dd46c | 687 | return found; |
4184ea7f | 688 | } |
0f9dd46c | 689 | } |
4184ea7f | 690 | rcu_read_unlock(); |
0f9dd46c | 691 | return NULL; |
6324fbf3 CM |
692 | } |
693 | ||
4184ea7f CM |
694 | /* |
695 | * after adding space to the filesystem, we need to clear the full flags | |
696 | * on all the space infos. | |
697 | */ | |
698 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
699 | { | |
700 | struct list_head *head = &info->space_info; | |
701 | struct btrfs_space_info *found; | |
702 | ||
703 | rcu_read_lock(); | |
704 | list_for_each_entry_rcu(found, head, list) | |
705 | found->full = 0; | |
706 | rcu_read_unlock(); | |
707 | } | |
708 | ||
e02119d5 | 709 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 710 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
711 | { |
712 | int ret; | |
713 | struct btrfs_key key; | |
31840ae1 | 714 | struct btrfs_path *path; |
e02119d5 | 715 | |
31840ae1 | 716 | path = btrfs_alloc_path(); |
d8926bb3 MF |
717 | if (!path) |
718 | return -ENOMEM; | |
719 | ||
e02119d5 CM |
720 | key.objectid = start; |
721 | key.offset = len; | |
3173a18f | 722 | key.type = BTRFS_EXTENT_ITEM_KEY; |
e02119d5 CM |
723 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
724 | 0, 0); | |
3173a18f JB |
725 | if (ret > 0) { |
726 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
727 | if (key.objectid == start && | |
728 | key.type == BTRFS_METADATA_ITEM_KEY) | |
729 | ret = 0; | |
730 | } | |
31840ae1 | 731 | btrfs_free_path(path); |
7bb86316 CM |
732 | return ret; |
733 | } | |
734 | ||
a22285a6 | 735 | /* |
3173a18f | 736 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
737 | * |
738 | * the head node for delayed ref is used to store the sum of all the | |
739 | * reference count modifications queued up in the rbtree. the head | |
740 | * node may also store the extent flags to set. This way you can check | |
741 | * to see what the reference count and extent flags would be if all of | |
742 | * the delayed refs are not processed. | |
743 | */ | |
744 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
745 | struct btrfs_root *root, u64 bytenr, | |
3173a18f | 746 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
747 | { |
748 | struct btrfs_delayed_ref_head *head; | |
749 | struct btrfs_delayed_ref_root *delayed_refs; | |
750 | struct btrfs_path *path; | |
751 | struct btrfs_extent_item *ei; | |
752 | struct extent_buffer *leaf; | |
753 | struct btrfs_key key; | |
754 | u32 item_size; | |
755 | u64 num_refs; | |
756 | u64 extent_flags; | |
757 | int ret; | |
758 | ||
3173a18f JB |
759 | /* |
760 | * If we don't have skinny metadata, don't bother doing anything | |
761 | * different | |
762 | */ | |
763 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
764 | offset = root->leafsize; | |
765 | metadata = 0; | |
766 | } | |
767 | ||
a22285a6 YZ |
768 | path = btrfs_alloc_path(); |
769 | if (!path) | |
770 | return -ENOMEM; | |
771 | ||
a22285a6 YZ |
772 | if (!trans) { |
773 | path->skip_locking = 1; | |
774 | path->search_commit_root = 1; | |
775 | } | |
639eefc8 FDBM |
776 | |
777 | search_again: | |
778 | key.objectid = bytenr; | |
779 | key.offset = offset; | |
780 | if (metadata) | |
781 | key.type = BTRFS_METADATA_ITEM_KEY; | |
782 | else | |
783 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
784 | ||
a22285a6 YZ |
785 | again: |
786 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
787 | &key, path, 0, 0); | |
788 | if (ret < 0) | |
789 | goto out_free; | |
790 | ||
3173a18f | 791 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
792 | if (path->slots[0]) { |
793 | path->slots[0]--; | |
794 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
795 | path->slots[0]); | |
796 | if (key.objectid == bytenr && | |
797 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
798 | key.offset == root->leafsize) | |
799 | ret = 0; | |
800 | } | |
801 | if (ret) { | |
802 | key.objectid = bytenr; | |
803 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
804 | key.offset = root->leafsize; | |
805 | btrfs_release_path(path); | |
806 | goto again; | |
807 | } | |
3173a18f JB |
808 | } |
809 | ||
a22285a6 YZ |
810 | if (ret == 0) { |
811 | leaf = path->nodes[0]; | |
812 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
813 | if (item_size >= sizeof(*ei)) { | |
814 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
815 | struct btrfs_extent_item); | |
816 | num_refs = btrfs_extent_refs(leaf, ei); | |
817 | extent_flags = btrfs_extent_flags(leaf, ei); | |
818 | } else { | |
819 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
820 | struct btrfs_extent_item_v0 *ei0; | |
821 | BUG_ON(item_size != sizeof(*ei0)); | |
822 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
823 | struct btrfs_extent_item_v0); | |
824 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
825 | /* FIXME: this isn't correct for data */ | |
826 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
827 | #else | |
828 | BUG(); | |
829 | #endif | |
830 | } | |
831 | BUG_ON(num_refs == 0); | |
832 | } else { | |
833 | num_refs = 0; | |
834 | extent_flags = 0; | |
835 | ret = 0; | |
836 | } | |
837 | ||
838 | if (!trans) | |
839 | goto out; | |
840 | ||
841 | delayed_refs = &trans->transaction->delayed_refs; | |
842 | spin_lock(&delayed_refs->lock); | |
843 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
844 | if (head) { | |
845 | if (!mutex_trylock(&head->mutex)) { | |
846 | atomic_inc(&head->node.refs); | |
847 | spin_unlock(&delayed_refs->lock); | |
848 | ||
b3b4aa74 | 849 | btrfs_release_path(path); |
a22285a6 | 850 | |
8cc33e5c DS |
851 | /* |
852 | * Mutex was contended, block until it's released and try | |
853 | * again | |
854 | */ | |
a22285a6 YZ |
855 | mutex_lock(&head->mutex); |
856 | mutex_unlock(&head->mutex); | |
857 | btrfs_put_delayed_ref(&head->node); | |
639eefc8 | 858 | goto search_again; |
a22285a6 | 859 | } |
d7df2c79 | 860 | spin_lock(&head->lock); |
a22285a6 YZ |
861 | if (head->extent_op && head->extent_op->update_flags) |
862 | extent_flags |= head->extent_op->flags_to_set; | |
863 | else | |
864 | BUG_ON(num_refs == 0); | |
865 | ||
866 | num_refs += head->node.ref_mod; | |
d7df2c79 | 867 | spin_unlock(&head->lock); |
a22285a6 YZ |
868 | mutex_unlock(&head->mutex); |
869 | } | |
870 | spin_unlock(&delayed_refs->lock); | |
871 | out: | |
872 | WARN_ON(num_refs == 0); | |
873 | if (refs) | |
874 | *refs = num_refs; | |
875 | if (flags) | |
876 | *flags = extent_flags; | |
877 | out_free: | |
878 | btrfs_free_path(path); | |
879 | return ret; | |
880 | } | |
881 | ||
d8d5f3e1 CM |
882 | /* |
883 | * Back reference rules. Back refs have three main goals: | |
884 | * | |
885 | * 1) differentiate between all holders of references to an extent so that | |
886 | * when a reference is dropped we can make sure it was a valid reference | |
887 | * before freeing the extent. | |
888 | * | |
889 | * 2) Provide enough information to quickly find the holders of an extent | |
890 | * if we notice a given block is corrupted or bad. | |
891 | * | |
892 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
893 | * maintenance. This is actually the same as #2, but with a slightly | |
894 | * different use case. | |
895 | * | |
5d4f98a2 YZ |
896 | * There are two kinds of back refs. The implicit back refs is optimized |
897 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
898 | * back refs of this kind provide information about the block's owner tree | |
899 | * and the pointer's key. These information allow us to find the block by | |
900 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
901 | * referenced by their owner trees. The location of tree block is recorded | |
902 | * in the back refs. Actually the full back refs is generic, and can be | |
903 | * used in all cases the implicit back refs is used. The major shortcoming | |
904 | * of the full back refs is its overhead. Every time a tree block gets | |
905 | * COWed, we have to update back refs entry for all pointers in it. | |
906 | * | |
907 | * For a newly allocated tree block, we use implicit back refs for | |
908 | * pointers in it. This means most tree related operations only involve | |
909 | * implicit back refs. For a tree block created in old transaction, the | |
910 | * only way to drop a reference to it is COW it. So we can detect the | |
911 | * event that tree block loses its owner tree's reference and do the | |
912 | * back refs conversion. | |
913 | * | |
914 | * When a tree block is COW'd through a tree, there are four cases: | |
915 | * | |
916 | * The reference count of the block is one and the tree is the block's | |
917 | * owner tree. Nothing to do in this case. | |
918 | * | |
919 | * The reference count of the block is one and the tree is not the | |
920 | * block's owner tree. In this case, full back refs is used for pointers | |
921 | * in the block. Remove these full back refs, add implicit back refs for | |
922 | * every pointers in the new block. | |
923 | * | |
924 | * The reference count of the block is greater than one and the tree is | |
925 | * the block's owner tree. In this case, implicit back refs is used for | |
926 | * pointers in the block. Add full back refs for every pointers in the | |
927 | * block, increase lower level extents' reference counts. The original | |
928 | * implicit back refs are entailed to the new block. | |
929 | * | |
930 | * The reference count of the block is greater than one and the tree is | |
931 | * not the block's owner tree. Add implicit back refs for every pointer in | |
932 | * the new block, increase lower level extents' reference count. | |
933 | * | |
934 | * Back Reference Key composing: | |
935 | * | |
936 | * The key objectid corresponds to the first byte in the extent, | |
937 | * The key type is used to differentiate between types of back refs. | |
938 | * There are different meanings of the key offset for different types | |
939 | * of back refs. | |
940 | * | |
d8d5f3e1 CM |
941 | * File extents can be referenced by: |
942 | * | |
943 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 944 | * - different files inside a single subvolume |
d8d5f3e1 CM |
945 | * - different offsets inside a file (bookend extents in file.c) |
946 | * | |
5d4f98a2 | 947 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
948 | * |
949 | * - Objectid of the subvolume root | |
d8d5f3e1 | 950 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
951 | * - original offset in the file |
952 | * - how many bookend extents | |
d8d5f3e1 | 953 | * |
5d4f98a2 YZ |
954 | * The key offset for the implicit back refs is hash of the first |
955 | * three fields. | |
d8d5f3e1 | 956 | * |
5d4f98a2 | 957 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 958 | * |
5d4f98a2 | 959 | * - number of pointers in the tree leaf |
d8d5f3e1 | 960 | * |
5d4f98a2 YZ |
961 | * The key offset for the implicit back refs is the first byte of |
962 | * the tree leaf | |
d8d5f3e1 | 963 | * |
5d4f98a2 YZ |
964 | * When a file extent is allocated, The implicit back refs is used. |
965 | * the fields are filled in: | |
d8d5f3e1 | 966 | * |
5d4f98a2 | 967 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 968 | * |
5d4f98a2 YZ |
969 | * When a file extent is removed file truncation, we find the |
970 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 971 | * |
5d4f98a2 | 972 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 973 | * |
5d4f98a2 | 974 | * Btree extents can be referenced by: |
d8d5f3e1 | 975 | * |
5d4f98a2 | 976 | * - Different subvolumes |
d8d5f3e1 | 977 | * |
5d4f98a2 YZ |
978 | * Both the implicit back refs and the full back refs for tree blocks |
979 | * only consist of key. The key offset for the implicit back refs is | |
980 | * objectid of block's owner tree. The key offset for the full back refs | |
981 | * is the first byte of parent block. | |
d8d5f3e1 | 982 | * |
5d4f98a2 YZ |
983 | * When implicit back refs is used, information about the lowest key and |
984 | * level of the tree block are required. These information are stored in | |
985 | * tree block info structure. | |
d8d5f3e1 | 986 | */ |
31840ae1 | 987 | |
5d4f98a2 YZ |
988 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
989 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
990 | struct btrfs_root *root, | |
991 | struct btrfs_path *path, | |
992 | u64 owner, u32 extra_size) | |
7bb86316 | 993 | { |
5d4f98a2 YZ |
994 | struct btrfs_extent_item *item; |
995 | struct btrfs_extent_item_v0 *ei0; | |
996 | struct btrfs_extent_ref_v0 *ref0; | |
997 | struct btrfs_tree_block_info *bi; | |
998 | struct extent_buffer *leaf; | |
7bb86316 | 999 | struct btrfs_key key; |
5d4f98a2 YZ |
1000 | struct btrfs_key found_key; |
1001 | u32 new_size = sizeof(*item); | |
1002 | u64 refs; | |
1003 | int ret; | |
1004 | ||
1005 | leaf = path->nodes[0]; | |
1006 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
1007 | ||
1008 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1009 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1010 | struct btrfs_extent_item_v0); | |
1011 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1012 | ||
1013 | if (owner == (u64)-1) { | |
1014 | while (1) { | |
1015 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1016 | ret = btrfs_next_leaf(root, path); | |
1017 | if (ret < 0) | |
1018 | return ret; | |
79787eaa | 1019 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1020 | leaf = path->nodes[0]; |
1021 | } | |
1022 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1023 | path->slots[0]); | |
1024 | BUG_ON(key.objectid != found_key.objectid); | |
1025 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1026 | path->slots[0]++; | |
1027 | continue; | |
1028 | } | |
1029 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1030 | struct btrfs_extent_ref_v0); | |
1031 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1032 | break; | |
1033 | } | |
1034 | } | |
b3b4aa74 | 1035 | btrfs_release_path(path); |
5d4f98a2 YZ |
1036 | |
1037 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1038 | new_size += sizeof(*bi); | |
1039 | ||
1040 | new_size -= sizeof(*ei0); | |
1041 | ret = btrfs_search_slot(trans, root, &key, path, | |
1042 | new_size + extra_size, 1); | |
1043 | if (ret < 0) | |
1044 | return ret; | |
79787eaa | 1045 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1046 | |
4b90c680 | 1047 | btrfs_extend_item(root, path, new_size); |
5d4f98a2 YZ |
1048 | |
1049 | leaf = path->nodes[0]; | |
1050 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1051 | btrfs_set_extent_refs(leaf, item, refs); | |
1052 | /* FIXME: get real generation */ | |
1053 | btrfs_set_extent_generation(leaf, item, 0); | |
1054 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1055 | btrfs_set_extent_flags(leaf, item, | |
1056 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1057 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1058 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1059 | /* FIXME: get first key of the block */ | |
1060 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1061 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1062 | } else { | |
1063 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1064 | } | |
1065 | btrfs_mark_buffer_dirty(leaf); | |
1066 | return 0; | |
1067 | } | |
1068 | #endif | |
1069 | ||
1070 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1071 | { | |
1072 | u32 high_crc = ~(u32)0; | |
1073 | u32 low_crc = ~(u32)0; | |
1074 | __le64 lenum; | |
1075 | ||
1076 | lenum = cpu_to_le64(root_objectid); | |
14a958e6 | 1077 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1078 | lenum = cpu_to_le64(owner); |
14a958e6 | 1079 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1080 | lenum = cpu_to_le64(offset); |
14a958e6 | 1081 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1082 | |
1083 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1084 | } | |
1085 | ||
1086 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1087 | struct btrfs_extent_data_ref *ref) | |
1088 | { | |
1089 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1090 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1091 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1092 | } | |
1093 | ||
1094 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1095 | struct btrfs_extent_data_ref *ref, | |
1096 | u64 root_objectid, u64 owner, u64 offset) | |
1097 | { | |
1098 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1099 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1100 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1101 | return 0; | |
1102 | return 1; | |
1103 | } | |
1104 | ||
1105 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1106 | struct btrfs_root *root, | |
1107 | struct btrfs_path *path, | |
1108 | u64 bytenr, u64 parent, | |
1109 | u64 root_objectid, | |
1110 | u64 owner, u64 offset) | |
1111 | { | |
1112 | struct btrfs_key key; | |
1113 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1114 | struct extent_buffer *leaf; |
5d4f98a2 | 1115 | u32 nritems; |
74493f7a | 1116 | int ret; |
5d4f98a2 YZ |
1117 | int recow; |
1118 | int err = -ENOENT; | |
74493f7a | 1119 | |
31840ae1 | 1120 | key.objectid = bytenr; |
5d4f98a2 YZ |
1121 | if (parent) { |
1122 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1123 | key.offset = parent; | |
1124 | } else { | |
1125 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1126 | key.offset = hash_extent_data_ref(root_objectid, | |
1127 | owner, offset); | |
1128 | } | |
1129 | again: | |
1130 | recow = 0; | |
1131 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1132 | if (ret < 0) { | |
1133 | err = ret; | |
1134 | goto fail; | |
1135 | } | |
31840ae1 | 1136 | |
5d4f98a2 YZ |
1137 | if (parent) { |
1138 | if (!ret) | |
1139 | return 0; | |
1140 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1141 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1142 | btrfs_release_path(path); |
5d4f98a2 YZ |
1143 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1144 | if (ret < 0) { | |
1145 | err = ret; | |
1146 | goto fail; | |
1147 | } | |
1148 | if (!ret) | |
1149 | return 0; | |
1150 | #endif | |
1151 | goto fail; | |
31840ae1 ZY |
1152 | } |
1153 | ||
1154 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1155 | nritems = btrfs_header_nritems(leaf); |
1156 | while (1) { | |
1157 | if (path->slots[0] >= nritems) { | |
1158 | ret = btrfs_next_leaf(root, path); | |
1159 | if (ret < 0) | |
1160 | err = ret; | |
1161 | if (ret) | |
1162 | goto fail; | |
1163 | ||
1164 | leaf = path->nodes[0]; | |
1165 | nritems = btrfs_header_nritems(leaf); | |
1166 | recow = 1; | |
1167 | } | |
1168 | ||
1169 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1170 | if (key.objectid != bytenr || | |
1171 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1172 | goto fail; | |
1173 | ||
1174 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1175 | struct btrfs_extent_data_ref); | |
1176 | ||
1177 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1178 | owner, offset)) { | |
1179 | if (recow) { | |
b3b4aa74 | 1180 | btrfs_release_path(path); |
5d4f98a2 YZ |
1181 | goto again; |
1182 | } | |
1183 | err = 0; | |
1184 | break; | |
1185 | } | |
1186 | path->slots[0]++; | |
31840ae1 | 1187 | } |
5d4f98a2 YZ |
1188 | fail: |
1189 | return err; | |
31840ae1 ZY |
1190 | } |
1191 | ||
5d4f98a2 YZ |
1192 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1193 | struct btrfs_root *root, | |
1194 | struct btrfs_path *path, | |
1195 | u64 bytenr, u64 parent, | |
1196 | u64 root_objectid, u64 owner, | |
1197 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1198 | { |
1199 | struct btrfs_key key; | |
1200 | struct extent_buffer *leaf; | |
5d4f98a2 | 1201 | u32 size; |
31840ae1 ZY |
1202 | u32 num_refs; |
1203 | int ret; | |
74493f7a | 1204 | |
74493f7a | 1205 | key.objectid = bytenr; |
5d4f98a2 YZ |
1206 | if (parent) { |
1207 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1208 | key.offset = parent; | |
1209 | size = sizeof(struct btrfs_shared_data_ref); | |
1210 | } else { | |
1211 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1212 | key.offset = hash_extent_data_ref(root_objectid, | |
1213 | owner, offset); | |
1214 | size = sizeof(struct btrfs_extent_data_ref); | |
1215 | } | |
74493f7a | 1216 | |
5d4f98a2 YZ |
1217 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1218 | if (ret && ret != -EEXIST) | |
1219 | goto fail; | |
1220 | ||
1221 | leaf = path->nodes[0]; | |
1222 | if (parent) { | |
1223 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1224 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1225 | struct btrfs_shared_data_ref); |
1226 | if (ret == 0) { | |
1227 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1228 | } else { | |
1229 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1230 | num_refs += refs_to_add; | |
1231 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1232 | } |
5d4f98a2 YZ |
1233 | } else { |
1234 | struct btrfs_extent_data_ref *ref; | |
1235 | while (ret == -EEXIST) { | |
1236 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1237 | struct btrfs_extent_data_ref); | |
1238 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1239 | owner, offset)) | |
1240 | break; | |
b3b4aa74 | 1241 | btrfs_release_path(path); |
5d4f98a2 YZ |
1242 | key.offset++; |
1243 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1244 | size); | |
1245 | if (ret && ret != -EEXIST) | |
1246 | goto fail; | |
31840ae1 | 1247 | |
5d4f98a2 YZ |
1248 | leaf = path->nodes[0]; |
1249 | } | |
1250 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1251 | struct btrfs_extent_data_ref); | |
1252 | if (ret == 0) { | |
1253 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1254 | root_objectid); | |
1255 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1256 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1257 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1258 | } else { | |
1259 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1260 | num_refs += refs_to_add; | |
1261 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1262 | } |
31840ae1 | 1263 | } |
5d4f98a2 YZ |
1264 | btrfs_mark_buffer_dirty(leaf); |
1265 | ret = 0; | |
1266 | fail: | |
b3b4aa74 | 1267 | btrfs_release_path(path); |
7bb86316 | 1268 | return ret; |
74493f7a CM |
1269 | } |
1270 | ||
5d4f98a2 YZ |
1271 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1272 | struct btrfs_root *root, | |
1273 | struct btrfs_path *path, | |
1274 | int refs_to_drop) | |
31840ae1 | 1275 | { |
5d4f98a2 YZ |
1276 | struct btrfs_key key; |
1277 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1278 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1279 | struct extent_buffer *leaf; |
5d4f98a2 | 1280 | u32 num_refs = 0; |
31840ae1 ZY |
1281 | int ret = 0; |
1282 | ||
1283 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1284 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1285 | ||
1286 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1287 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1288 | struct btrfs_extent_data_ref); | |
1289 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1290 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1291 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1292 | struct btrfs_shared_data_ref); | |
1293 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1294 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1295 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1296 | struct btrfs_extent_ref_v0 *ref0; | |
1297 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1298 | struct btrfs_extent_ref_v0); | |
1299 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1300 | #endif | |
1301 | } else { | |
1302 | BUG(); | |
1303 | } | |
1304 | ||
56bec294 CM |
1305 | BUG_ON(num_refs < refs_to_drop); |
1306 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1307 | |
31840ae1 ZY |
1308 | if (num_refs == 0) { |
1309 | ret = btrfs_del_item(trans, root, path); | |
1310 | } else { | |
5d4f98a2 YZ |
1311 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1312 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1313 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1314 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1315 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1316 | else { | |
1317 | struct btrfs_extent_ref_v0 *ref0; | |
1318 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1319 | struct btrfs_extent_ref_v0); | |
1320 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1321 | } | |
1322 | #endif | |
31840ae1 ZY |
1323 | btrfs_mark_buffer_dirty(leaf); |
1324 | } | |
31840ae1 ZY |
1325 | return ret; |
1326 | } | |
1327 | ||
5d4f98a2 YZ |
1328 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1329 | struct btrfs_path *path, | |
1330 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1331 | { |
5d4f98a2 YZ |
1332 | struct btrfs_key key; |
1333 | struct extent_buffer *leaf; | |
1334 | struct btrfs_extent_data_ref *ref1; | |
1335 | struct btrfs_shared_data_ref *ref2; | |
1336 | u32 num_refs = 0; | |
1337 | ||
1338 | leaf = path->nodes[0]; | |
1339 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1340 | if (iref) { | |
1341 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1342 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1343 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1344 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1345 | } else { | |
1346 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1347 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1348 | } | |
1349 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1350 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1351 | struct btrfs_extent_data_ref); | |
1352 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1353 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1354 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1355 | struct btrfs_shared_data_ref); | |
1356 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1357 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1358 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1359 | struct btrfs_extent_ref_v0 *ref0; | |
1360 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1361 | struct btrfs_extent_ref_v0); | |
1362 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1363 | #endif |
5d4f98a2 YZ |
1364 | } else { |
1365 | WARN_ON(1); | |
1366 | } | |
1367 | return num_refs; | |
1368 | } | |
15916de8 | 1369 | |
5d4f98a2 YZ |
1370 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1371 | struct btrfs_root *root, | |
1372 | struct btrfs_path *path, | |
1373 | u64 bytenr, u64 parent, | |
1374 | u64 root_objectid) | |
1f3c79a2 | 1375 | { |
5d4f98a2 | 1376 | struct btrfs_key key; |
1f3c79a2 | 1377 | int ret; |
1f3c79a2 | 1378 | |
5d4f98a2 YZ |
1379 | key.objectid = bytenr; |
1380 | if (parent) { | |
1381 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1382 | key.offset = parent; | |
1383 | } else { | |
1384 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1385 | key.offset = root_objectid; | |
1f3c79a2 LH |
1386 | } |
1387 | ||
5d4f98a2 YZ |
1388 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1389 | if (ret > 0) | |
1390 | ret = -ENOENT; | |
1391 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1392 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1393 | btrfs_release_path(path); |
5d4f98a2 YZ |
1394 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1395 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1396 | if (ret > 0) | |
1397 | ret = -ENOENT; | |
1398 | } | |
1f3c79a2 | 1399 | #endif |
5d4f98a2 | 1400 | return ret; |
1f3c79a2 LH |
1401 | } |
1402 | ||
5d4f98a2 YZ |
1403 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1404 | struct btrfs_root *root, | |
1405 | struct btrfs_path *path, | |
1406 | u64 bytenr, u64 parent, | |
1407 | u64 root_objectid) | |
31840ae1 | 1408 | { |
5d4f98a2 | 1409 | struct btrfs_key key; |
31840ae1 | 1410 | int ret; |
31840ae1 | 1411 | |
5d4f98a2 YZ |
1412 | key.objectid = bytenr; |
1413 | if (parent) { | |
1414 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1415 | key.offset = parent; | |
1416 | } else { | |
1417 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1418 | key.offset = root_objectid; | |
1419 | } | |
1420 | ||
1421 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1422 | btrfs_release_path(path); |
31840ae1 ZY |
1423 | return ret; |
1424 | } | |
1425 | ||
5d4f98a2 | 1426 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1427 | { |
5d4f98a2 YZ |
1428 | int type; |
1429 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1430 | if (parent > 0) | |
1431 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1432 | else | |
1433 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1434 | } else { | |
1435 | if (parent > 0) | |
1436 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1437 | else | |
1438 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1439 | } | |
1440 | return type; | |
31840ae1 | 1441 | } |
56bec294 | 1442 | |
2c47e605 YZ |
1443 | static int find_next_key(struct btrfs_path *path, int level, |
1444 | struct btrfs_key *key) | |
56bec294 | 1445 | |
02217ed2 | 1446 | { |
2c47e605 | 1447 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1448 | if (!path->nodes[level]) |
1449 | break; | |
5d4f98a2 YZ |
1450 | if (path->slots[level] + 1 >= |
1451 | btrfs_header_nritems(path->nodes[level])) | |
1452 | continue; | |
1453 | if (level == 0) | |
1454 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1455 | path->slots[level] + 1); | |
1456 | else | |
1457 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1458 | path->slots[level] + 1); | |
1459 | return 0; | |
1460 | } | |
1461 | return 1; | |
1462 | } | |
037e6390 | 1463 | |
5d4f98a2 YZ |
1464 | /* |
1465 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1466 | * to the address of inline back ref, and 0 is returned. | |
1467 | * | |
1468 | * if back ref isn't found, *ref_ret is set to the address where it | |
1469 | * should be inserted, and -ENOENT is returned. | |
1470 | * | |
1471 | * if insert is true and there are too many inline back refs, the path | |
1472 | * points to the extent item, and -EAGAIN is returned. | |
1473 | * | |
1474 | * NOTE: inline back refs are ordered in the same way that back ref | |
1475 | * items in the tree are ordered. | |
1476 | */ | |
1477 | static noinline_for_stack | |
1478 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1479 | struct btrfs_root *root, | |
1480 | struct btrfs_path *path, | |
1481 | struct btrfs_extent_inline_ref **ref_ret, | |
1482 | u64 bytenr, u64 num_bytes, | |
1483 | u64 parent, u64 root_objectid, | |
1484 | u64 owner, u64 offset, int insert) | |
1485 | { | |
1486 | struct btrfs_key key; | |
1487 | struct extent_buffer *leaf; | |
1488 | struct btrfs_extent_item *ei; | |
1489 | struct btrfs_extent_inline_ref *iref; | |
1490 | u64 flags; | |
1491 | u64 item_size; | |
1492 | unsigned long ptr; | |
1493 | unsigned long end; | |
1494 | int extra_size; | |
1495 | int type; | |
1496 | int want; | |
1497 | int ret; | |
1498 | int err = 0; | |
3173a18f JB |
1499 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
1500 | SKINNY_METADATA); | |
26b8003f | 1501 | |
db94535d | 1502 | key.objectid = bytenr; |
31840ae1 | 1503 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1504 | key.offset = num_bytes; |
31840ae1 | 1505 | |
5d4f98a2 YZ |
1506 | want = extent_ref_type(parent, owner); |
1507 | if (insert) { | |
1508 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1509 | path->keep_locks = 1; |
5d4f98a2 YZ |
1510 | } else |
1511 | extra_size = -1; | |
3173a18f JB |
1512 | |
1513 | /* | |
1514 | * Owner is our parent level, so we can just add one to get the level | |
1515 | * for the block we are interested in. | |
1516 | */ | |
1517 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1518 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1519 | key.offset = owner; | |
1520 | } | |
1521 | ||
1522 | again: | |
5d4f98a2 | 1523 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1524 | if (ret < 0) { |
5d4f98a2 YZ |
1525 | err = ret; |
1526 | goto out; | |
1527 | } | |
3173a18f JB |
1528 | |
1529 | /* | |
1530 | * We may be a newly converted file system which still has the old fat | |
1531 | * extent entries for metadata, so try and see if we have one of those. | |
1532 | */ | |
1533 | if (ret > 0 && skinny_metadata) { | |
1534 | skinny_metadata = false; | |
1535 | if (path->slots[0]) { | |
1536 | path->slots[0]--; | |
1537 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1538 | path->slots[0]); | |
1539 | if (key.objectid == bytenr && | |
1540 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1541 | key.offset == num_bytes) | |
1542 | ret = 0; | |
1543 | } | |
1544 | if (ret) { | |
9ce49a0b | 1545 | key.objectid = bytenr; |
3173a18f JB |
1546 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1547 | key.offset = num_bytes; | |
1548 | btrfs_release_path(path); | |
1549 | goto again; | |
1550 | } | |
1551 | } | |
1552 | ||
79787eaa JM |
1553 | if (ret && !insert) { |
1554 | err = -ENOENT; | |
1555 | goto out; | |
fae7f21c | 1556 | } else if (WARN_ON(ret)) { |
492104c8 | 1557 | err = -EIO; |
492104c8 | 1558 | goto out; |
79787eaa | 1559 | } |
5d4f98a2 YZ |
1560 | |
1561 | leaf = path->nodes[0]; | |
1562 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1563 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1564 | if (item_size < sizeof(*ei)) { | |
1565 | if (!insert) { | |
1566 | err = -ENOENT; | |
1567 | goto out; | |
1568 | } | |
1569 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1570 | extra_size); | |
1571 | if (ret < 0) { | |
1572 | err = ret; | |
1573 | goto out; | |
1574 | } | |
1575 | leaf = path->nodes[0]; | |
1576 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1577 | } | |
1578 | #endif | |
1579 | BUG_ON(item_size < sizeof(*ei)); | |
1580 | ||
5d4f98a2 YZ |
1581 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1582 | flags = btrfs_extent_flags(leaf, ei); | |
1583 | ||
1584 | ptr = (unsigned long)(ei + 1); | |
1585 | end = (unsigned long)ei + item_size; | |
1586 | ||
3173a18f | 1587 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1588 | ptr += sizeof(struct btrfs_tree_block_info); |
1589 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1590 | } |
1591 | ||
1592 | err = -ENOENT; | |
1593 | while (1) { | |
1594 | if (ptr >= end) { | |
1595 | WARN_ON(ptr > end); | |
1596 | break; | |
1597 | } | |
1598 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1599 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1600 | if (want < type) | |
1601 | break; | |
1602 | if (want > type) { | |
1603 | ptr += btrfs_extent_inline_ref_size(type); | |
1604 | continue; | |
1605 | } | |
1606 | ||
1607 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1608 | struct btrfs_extent_data_ref *dref; | |
1609 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1610 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1611 | owner, offset)) { | |
1612 | err = 0; | |
1613 | break; | |
1614 | } | |
1615 | if (hash_extent_data_ref_item(leaf, dref) < | |
1616 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1617 | break; | |
1618 | } else { | |
1619 | u64 ref_offset; | |
1620 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1621 | if (parent > 0) { | |
1622 | if (parent == ref_offset) { | |
1623 | err = 0; | |
1624 | break; | |
1625 | } | |
1626 | if (ref_offset < parent) | |
1627 | break; | |
1628 | } else { | |
1629 | if (root_objectid == ref_offset) { | |
1630 | err = 0; | |
1631 | break; | |
1632 | } | |
1633 | if (ref_offset < root_objectid) | |
1634 | break; | |
1635 | } | |
1636 | } | |
1637 | ptr += btrfs_extent_inline_ref_size(type); | |
1638 | } | |
1639 | if (err == -ENOENT && insert) { | |
1640 | if (item_size + extra_size >= | |
1641 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1642 | err = -EAGAIN; | |
1643 | goto out; | |
1644 | } | |
1645 | /* | |
1646 | * To add new inline back ref, we have to make sure | |
1647 | * there is no corresponding back ref item. | |
1648 | * For simplicity, we just do not add new inline back | |
1649 | * ref if there is any kind of item for this block | |
1650 | */ | |
2c47e605 YZ |
1651 | if (find_next_key(path, 0, &key) == 0 && |
1652 | key.objectid == bytenr && | |
85d4198e | 1653 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1654 | err = -EAGAIN; |
1655 | goto out; | |
1656 | } | |
1657 | } | |
1658 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1659 | out: | |
85d4198e | 1660 | if (insert) { |
5d4f98a2 YZ |
1661 | path->keep_locks = 0; |
1662 | btrfs_unlock_up_safe(path, 1); | |
1663 | } | |
1664 | return err; | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * helper to add new inline back ref | |
1669 | */ | |
1670 | static noinline_for_stack | |
fd279fae | 1671 | void setup_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1672 | struct btrfs_path *path, |
1673 | struct btrfs_extent_inline_ref *iref, | |
1674 | u64 parent, u64 root_objectid, | |
1675 | u64 owner, u64 offset, int refs_to_add, | |
1676 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1677 | { |
1678 | struct extent_buffer *leaf; | |
1679 | struct btrfs_extent_item *ei; | |
1680 | unsigned long ptr; | |
1681 | unsigned long end; | |
1682 | unsigned long item_offset; | |
1683 | u64 refs; | |
1684 | int size; | |
1685 | int type; | |
5d4f98a2 YZ |
1686 | |
1687 | leaf = path->nodes[0]; | |
1688 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1689 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1690 | ||
1691 | type = extent_ref_type(parent, owner); | |
1692 | size = btrfs_extent_inline_ref_size(type); | |
1693 | ||
4b90c680 | 1694 | btrfs_extend_item(root, path, size); |
5d4f98a2 YZ |
1695 | |
1696 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1697 | refs = btrfs_extent_refs(leaf, ei); | |
1698 | refs += refs_to_add; | |
1699 | btrfs_set_extent_refs(leaf, ei, refs); | |
1700 | if (extent_op) | |
1701 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1702 | ||
1703 | ptr = (unsigned long)ei + item_offset; | |
1704 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1705 | if (ptr < end - size) | |
1706 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1707 | end - size - ptr); | |
1708 | ||
1709 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1710 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1711 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1712 | struct btrfs_extent_data_ref *dref; | |
1713 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1714 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1715 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1716 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1717 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1718 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1719 | struct btrfs_shared_data_ref *sref; | |
1720 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1721 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1722 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1723 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1724 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1725 | } else { | |
1726 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1727 | } | |
1728 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1729 | } |
1730 | ||
1731 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1732 | struct btrfs_root *root, | |
1733 | struct btrfs_path *path, | |
1734 | struct btrfs_extent_inline_ref **ref_ret, | |
1735 | u64 bytenr, u64 num_bytes, u64 parent, | |
1736 | u64 root_objectid, u64 owner, u64 offset) | |
1737 | { | |
1738 | int ret; | |
1739 | ||
1740 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1741 | bytenr, num_bytes, parent, | |
1742 | root_objectid, owner, offset, 0); | |
1743 | if (ret != -ENOENT) | |
54aa1f4d | 1744 | return ret; |
5d4f98a2 | 1745 | |
b3b4aa74 | 1746 | btrfs_release_path(path); |
5d4f98a2 YZ |
1747 | *ref_ret = NULL; |
1748 | ||
1749 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1750 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1751 | root_objectid); | |
1752 | } else { | |
1753 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1754 | root_objectid, owner, offset); | |
b9473439 | 1755 | } |
5d4f98a2 YZ |
1756 | return ret; |
1757 | } | |
31840ae1 | 1758 | |
5d4f98a2 YZ |
1759 | /* |
1760 | * helper to update/remove inline back ref | |
1761 | */ | |
1762 | static noinline_for_stack | |
afe5fea7 | 1763 | void update_inline_extent_backref(struct btrfs_root *root, |
143bede5 JM |
1764 | struct btrfs_path *path, |
1765 | struct btrfs_extent_inline_ref *iref, | |
1766 | int refs_to_mod, | |
1767 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1768 | { |
1769 | struct extent_buffer *leaf; | |
1770 | struct btrfs_extent_item *ei; | |
1771 | struct btrfs_extent_data_ref *dref = NULL; | |
1772 | struct btrfs_shared_data_ref *sref = NULL; | |
1773 | unsigned long ptr; | |
1774 | unsigned long end; | |
1775 | u32 item_size; | |
1776 | int size; | |
1777 | int type; | |
5d4f98a2 YZ |
1778 | u64 refs; |
1779 | ||
1780 | leaf = path->nodes[0]; | |
1781 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1782 | refs = btrfs_extent_refs(leaf, ei); | |
1783 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1784 | refs += refs_to_mod; | |
1785 | btrfs_set_extent_refs(leaf, ei, refs); | |
1786 | if (extent_op) | |
1787 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1788 | ||
1789 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1790 | ||
1791 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1792 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1793 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1794 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1795 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1796 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1797 | } else { | |
1798 | refs = 1; | |
1799 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1800 | } |
31840ae1 | 1801 | |
5d4f98a2 YZ |
1802 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1803 | refs += refs_to_mod; | |
1804 | ||
1805 | if (refs > 0) { | |
1806 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1807 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1808 | else | |
1809 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1810 | } else { | |
1811 | size = btrfs_extent_inline_ref_size(type); | |
1812 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1813 | ptr = (unsigned long)iref; | |
1814 | end = (unsigned long)ei + item_size; | |
1815 | if (ptr + size < end) | |
1816 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1817 | end - ptr - size); | |
1818 | item_size -= size; | |
afe5fea7 | 1819 | btrfs_truncate_item(root, path, item_size, 1); |
5d4f98a2 YZ |
1820 | } |
1821 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1822 | } |
1823 | ||
1824 | static noinline_for_stack | |
1825 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1826 | struct btrfs_root *root, | |
1827 | struct btrfs_path *path, | |
1828 | u64 bytenr, u64 num_bytes, u64 parent, | |
1829 | u64 root_objectid, u64 owner, | |
1830 | u64 offset, int refs_to_add, | |
1831 | struct btrfs_delayed_extent_op *extent_op) | |
1832 | { | |
1833 | struct btrfs_extent_inline_ref *iref; | |
1834 | int ret; | |
1835 | ||
1836 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1837 | bytenr, num_bytes, parent, | |
1838 | root_objectid, owner, offset, 1); | |
1839 | if (ret == 0) { | |
1840 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
afe5fea7 | 1841 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1842 | refs_to_add, extent_op); |
5d4f98a2 | 1843 | } else if (ret == -ENOENT) { |
fd279fae | 1844 | setup_inline_extent_backref(root, path, iref, parent, |
143bede5 JM |
1845 | root_objectid, owner, offset, |
1846 | refs_to_add, extent_op); | |
1847 | ret = 0; | |
771ed689 | 1848 | } |
5d4f98a2 YZ |
1849 | return ret; |
1850 | } | |
31840ae1 | 1851 | |
5d4f98a2 YZ |
1852 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1853 | struct btrfs_root *root, | |
1854 | struct btrfs_path *path, | |
1855 | u64 bytenr, u64 parent, u64 root_objectid, | |
1856 | u64 owner, u64 offset, int refs_to_add) | |
1857 | { | |
1858 | int ret; | |
1859 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1860 | BUG_ON(refs_to_add != 1); | |
1861 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1862 | parent, root_objectid); | |
1863 | } else { | |
1864 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1865 | parent, root_objectid, | |
1866 | owner, offset, refs_to_add); | |
1867 | } | |
1868 | return ret; | |
1869 | } | |
56bec294 | 1870 | |
5d4f98a2 YZ |
1871 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1872 | struct btrfs_root *root, | |
1873 | struct btrfs_path *path, | |
1874 | struct btrfs_extent_inline_ref *iref, | |
1875 | int refs_to_drop, int is_data) | |
1876 | { | |
143bede5 | 1877 | int ret = 0; |
b9473439 | 1878 | |
5d4f98a2 YZ |
1879 | BUG_ON(!is_data && refs_to_drop != 1); |
1880 | if (iref) { | |
afe5fea7 | 1881 | update_inline_extent_backref(root, path, iref, |
143bede5 | 1882 | -refs_to_drop, NULL); |
5d4f98a2 YZ |
1883 | } else if (is_data) { |
1884 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1885 | } else { | |
1886 | ret = btrfs_del_item(trans, root, path); | |
1887 | } | |
1888 | return ret; | |
1889 | } | |
1890 | ||
5378e607 | 1891 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1892 | u64 start, u64 len) |
1893 | { | |
5378e607 | 1894 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1895 | } |
5d4f98a2 YZ |
1896 | |
1897 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1898 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1899 | { |
5d4f98a2 | 1900 | int ret; |
5378e607 | 1901 | u64 discarded_bytes = 0; |
a1d3c478 | 1902 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1903 | |
e244a0ae | 1904 | |
5d4f98a2 | 1905 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1906 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1907 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1908 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1909 | if (!ret) { |
a1d3c478 | 1910 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1911 | int i; |
1912 | ||
5d4f98a2 | 1913 | |
a1d3c478 | 1914 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1915 | if (!stripe->dev->can_discard) |
1916 | continue; | |
1917 | ||
5378e607 LD |
1918 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1919 | stripe->physical, | |
1920 | stripe->length); | |
1921 | if (!ret) | |
1922 | discarded_bytes += stripe->length; | |
1923 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1924 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1925 | |
1926 | /* | |
1927 | * Just in case we get back EOPNOTSUPP for some reason, | |
1928 | * just ignore the return value so we don't screw up | |
1929 | * people calling discard_extent. | |
1930 | */ | |
1931 | ret = 0; | |
5d4f98a2 | 1932 | } |
a1d3c478 | 1933 | kfree(bbio); |
5d4f98a2 | 1934 | } |
5378e607 LD |
1935 | |
1936 | if (actual_bytes) | |
1937 | *actual_bytes = discarded_bytes; | |
1938 | ||
5d4f98a2 | 1939 | |
53b381b3 DW |
1940 | if (ret == -EOPNOTSUPP) |
1941 | ret = 0; | |
5d4f98a2 | 1942 | return ret; |
5d4f98a2 YZ |
1943 | } |
1944 | ||
79787eaa | 1945 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1946 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1947 | struct btrfs_root *root, | |
1948 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1949 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1950 | { |
1951 | int ret; | |
66d7e7f0 AJ |
1952 | struct btrfs_fs_info *fs_info = root->fs_info; |
1953 | ||
5d4f98a2 YZ |
1954 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1955 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1956 | ||
1957 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1958 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1959 | num_bytes, | |
5d4f98a2 | 1960 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1961 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1962 | } else { |
66d7e7f0 AJ |
1963 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1964 | num_bytes, | |
5d4f98a2 | 1965 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1966 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1967 | } |
1968 | return ret; | |
1969 | } | |
1970 | ||
1971 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1972 | struct btrfs_root *root, | |
1973 | u64 bytenr, u64 num_bytes, | |
1974 | u64 parent, u64 root_objectid, | |
1975 | u64 owner, u64 offset, int refs_to_add, | |
1976 | struct btrfs_delayed_extent_op *extent_op) | |
1977 | { | |
1978 | struct btrfs_path *path; | |
1979 | struct extent_buffer *leaf; | |
1980 | struct btrfs_extent_item *item; | |
1981 | u64 refs; | |
1982 | int ret; | |
5d4f98a2 YZ |
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); | |
30d133fc | 1995 | if (ret != -EAGAIN) |
5d4f98a2 YZ |
1996 | goto out; |
1997 | ||
5d4f98a2 YZ |
1998 | leaf = path->nodes[0]; |
1999 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2000 | refs = btrfs_extent_refs(leaf, item); | |
2001 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2002 | if (extent_op) | |
2003 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2004 | |
5d4f98a2 | 2005 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2006 | btrfs_release_path(path); |
56bec294 CM |
2007 | |
2008 | path->reada = 1; | |
b9473439 CM |
2009 | path->leave_spinning = 1; |
2010 | ||
56bec294 CM |
2011 | /* now insert the actual backref */ |
2012 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
2013 | path, bytenr, parent, root_objectid, |
2014 | owner, offset, refs_to_add); | |
79787eaa JM |
2015 | if (ret) |
2016 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 2017 | out: |
56bec294 | 2018 | btrfs_free_path(path); |
30d133fc | 2019 | return ret; |
56bec294 CM |
2020 | } |
2021 | ||
5d4f98a2 YZ |
2022 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2023 | struct btrfs_root *root, | |
2024 | struct btrfs_delayed_ref_node *node, | |
2025 | struct btrfs_delayed_extent_op *extent_op, | |
2026 | int insert_reserved) | |
56bec294 | 2027 | { |
5d4f98a2 YZ |
2028 | int ret = 0; |
2029 | struct btrfs_delayed_data_ref *ref; | |
2030 | struct btrfs_key ins; | |
2031 | u64 parent = 0; | |
2032 | u64 ref_root = 0; | |
2033 | u64 flags = 0; | |
2034 | ||
2035 | ins.objectid = node->bytenr; | |
2036 | ins.offset = node->num_bytes; | |
2037 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2038 | ||
2039 | ref = btrfs_delayed_node_to_data_ref(node); | |
599c75ec LB |
2040 | trace_run_delayed_data_ref(node, ref, node->action); |
2041 | ||
5d4f98a2 YZ |
2042 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2043 | parent = ref->parent; | |
2044 | else | |
2045 | ref_root = ref->root; | |
2046 | ||
2047 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2048 | if (extent_op) |
5d4f98a2 | 2049 | flags |= extent_op->flags_to_set; |
5d4f98a2 YZ |
2050 | ret = alloc_reserved_file_extent(trans, root, |
2051 | parent, ref_root, flags, | |
2052 | ref->objectid, ref->offset, | |
2053 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
2054 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2055 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2056 | node->num_bytes, parent, | |
2057 | ref_root, ref->objectid, | |
2058 | ref->offset, node->ref_mod, | |
2059 | extent_op); | |
2060 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2061 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2062 | node->num_bytes, parent, | |
2063 | ref_root, ref->objectid, | |
2064 | ref->offset, node->ref_mod, | |
2065 | extent_op); | |
2066 | } else { | |
2067 | BUG(); | |
2068 | } | |
2069 | return ret; | |
2070 | } | |
2071 | ||
2072 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2073 | struct extent_buffer *leaf, | |
2074 | struct btrfs_extent_item *ei) | |
2075 | { | |
2076 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2077 | if (extent_op->update_flags) { | |
2078 | flags |= extent_op->flags_to_set; | |
2079 | btrfs_set_extent_flags(leaf, ei, flags); | |
2080 | } | |
2081 | ||
2082 | if (extent_op->update_key) { | |
2083 | struct btrfs_tree_block_info *bi; | |
2084 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2085 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2086 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2087 | } | |
2088 | } | |
2089 | ||
2090 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2091 | struct btrfs_root *root, | |
2092 | struct btrfs_delayed_ref_node *node, | |
2093 | struct btrfs_delayed_extent_op *extent_op) | |
2094 | { | |
2095 | struct btrfs_key key; | |
2096 | struct btrfs_path *path; | |
2097 | struct btrfs_extent_item *ei; | |
2098 | struct extent_buffer *leaf; | |
2099 | u32 item_size; | |
56bec294 | 2100 | int ret; |
5d4f98a2 | 2101 | int err = 0; |
b1c79e09 | 2102 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2103 | |
79787eaa JM |
2104 | if (trans->aborted) |
2105 | return 0; | |
2106 | ||
3173a18f JB |
2107 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
2108 | metadata = 0; | |
2109 | ||
5d4f98a2 YZ |
2110 | path = btrfs_alloc_path(); |
2111 | if (!path) | |
2112 | return -ENOMEM; | |
2113 | ||
2114 | key.objectid = node->bytenr; | |
5d4f98a2 | 2115 | |
3173a18f | 2116 | if (metadata) { |
3173a18f | 2117 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2118 | key.offset = extent_op->level; |
3173a18f JB |
2119 | } else { |
2120 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2121 | key.offset = node->num_bytes; | |
2122 | } | |
2123 | ||
2124 | again: | |
5d4f98a2 YZ |
2125 | path->reada = 1; |
2126 | path->leave_spinning = 1; | |
2127 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2128 | path, 0, 1); | |
2129 | if (ret < 0) { | |
2130 | err = ret; | |
2131 | goto out; | |
2132 | } | |
2133 | if (ret > 0) { | |
3173a18f | 2134 | if (metadata) { |
55994887 FDBM |
2135 | if (path->slots[0] > 0) { |
2136 | path->slots[0]--; | |
2137 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2138 | path->slots[0]); | |
2139 | if (key.objectid == node->bytenr && | |
2140 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
2141 | key.offset == node->num_bytes) | |
2142 | ret = 0; | |
2143 | } | |
2144 | if (ret > 0) { | |
2145 | btrfs_release_path(path); | |
2146 | metadata = 0; | |
3173a18f | 2147 | |
55994887 FDBM |
2148 | key.objectid = node->bytenr; |
2149 | key.offset = node->num_bytes; | |
2150 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2151 | goto again; | |
2152 | } | |
2153 | } else { | |
2154 | err = -EIO; | |
2155 | goto out; | |
3173a18f | 2156 | } |
5d4f98a2 YZ |
2157 | } |
2158 | ||
2159 | leaf = path->nodes[0]; | |
2160 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2161 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2162 | if (item_size < sizeof(*ei)) { | |
2163 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2164 | path, (u64)-1, 0); | |
2165 | if (ret < 0) { | |
2166 | err = ret; | |
2167 | goto out; | |
2168 | } | |
2169 | leaf = path->nodes[0]; | |
2170 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2171 | } | |
2172 | #endif | |
2173 | BUG_ON(item_size < sizeof(*ei)); | |
2174 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2175 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2176 | |
5d4f98a2 YZ |
2177 | btrfs_mark_buffer_dirty(leaf); |
2178 | out: | |
2179 | btrfs_free_path(path); | |
2180 | return err; | |
56bec294 CM |
2181 | } |
2182 | ||
5d4f98a2 YZ |
2183 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2184 | struct btrfs_root *root, | |
2185 | struct btrfs_delayed_ref_node *node, | |
2186 | struct btrfs_delayed_extent_op *extent_op, | |
2187 | int insert_reserved) | |
56bec294 CM |
2188 | { |
2189 | int ret = 0; | |
5d4f98a2 YZ |
2190 | struct btrfs_delayed_tree_ref *ref; |
2191 | struct btrfs_key ins; | |
2192 | u64 parent = 0; | |
2193 | u64 ref_root = 0; | |
3173a18f JB |
2194 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
2195 | SKINNY_METADATA); | |
56bec294 | 2196 | |
5d4f98a2 | 2197 | ref = btrfs_delayed_node_to_tree_ref(node); |
599c75ec LB |
2198 | trace_run_delayed_tree_ref(node, ref, node->action); |
2199 | ||
5d4f98a2 YZ |
2200 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2201 | parent = ref->parent; | |
2202 | else | |
2203 | ref_root = ref->root; | |
2204 | ||
3173a18f JB |
2205 | ins.objectid = node->bytenr; |
2206 | if (skinny_metadata) { | |
2207 | ins.offset = ref->level; | |
2208 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2209 | } else { | |
2210 | ins.offset = node->num_bytes; | |
2211 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2212 | } | |
2213 | ||
5d4f98a2 YZ |
2214 | BUG_ON(node->ref_mod != 1); |
2215 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2216 | BUG_ON(!extent_op || !extent_op->update_flags); |
5d4f98a2 YZ |
2217 | ret = alloc_reserved_tree_block(trans, root, |
2218 | parent, ref_root, | |
2219 | extent_op->flags_to_set, | |
2220 | &extent_op->key, | |
2221 | ref->level, &ins); | |
5d4f98a2 YZ |
2222 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2223 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2224 | node->num_bytes, parent, ref_root, | |
2225 | ref->level, 0, 1, extent_op); | |
2226 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2227 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2228 | node->num_bytes, parent, ref_root, | |
2229 | ref->level, 0, 1, extent_op); | |
2230 | } else { | |
2231 | BUG(); | |
2232 | } | |
56bec294 CM |
2233 | return ret; |
2234 | } | |
2235 | ||
2236 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2237 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2238 | struct btrfs_root *root, | |
2239 | struct btrfs_delayed_ref_node *node, | |
2240 | struct btrfs_delayed_extent_op *extent_op, | |
2241 | int insert_reserved) | |
56bec294 | 2242 | { |
79787eaa JM |
2243 | int ret = 0; |
2244 | ||
857cc2fc JB |
2245 | if (trans->aborted) { |
2246 | if (insert_reserved) | |
2247 | btrfs_pin_extent(root, node->bytenr, | |
2248 | node->num_bytes, 1); | |
79787eaa | 2249 | return 0; |
857cc2fc | 2250 | } |
79787eaa | 2251 | |
5d4f98a2 | 2252 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2253 | struct btrfs_delayed_ref_head *head; |
2254 | /* | |
2255 | * we've hit the end of the chain and we were supposed | |
2256 | * to insert this extent into the tree. But, it got | |
2257 | * deleted before we ever needed to insert it, so all | |
2258 | * we have to do is clean up the accounting | |
2259 | */ | |
5d4f98a2 YZ |
2260 | BUG_ON(extent_op); |
2261 | head = btrfs_delayed_node_to_head(node); | |
599c75ec LB |
2262 | trace_run_delayed_ref_head(node, head, node->action); |
2263 | ||
56bec294 | 2264 | if (insert_reserved) { |
f0486c68 YZ |
2265 | btrfs_pin_extent(root, node->bytenr, |
2266 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2267 | if (head->is_data) { |
2268 | ret = btrfs_del_csums(trans, root, | |
2269 | node->bytenr, | |
2270 | node->num_bytes); | |
5d4f98a2 | 2271 | } |
56bec294 | 2272 | } |
79787eaa | 2273 | return ret; |
56bec294 CM |
2274 | } |
2275 | ||
5d4f98a2 YZ |
2276 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2277 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2278 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2279 | insert_reserved); | |
2280 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2281 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2282 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2283 | insert_reserved); | |
2284 | else | |
2285 | BUG(); | |
2286 | return ret; | |
56bec294 CM |
2287 | } |
2288 | ||
2289 | static noinline struct btrfs_delayed_ref_node * | |
2290 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2291 | { | |
2292 | struct rb_node *node; | |
d7df2c79 JB |
2293 | struct btrfs_delayed_ref_node *ref, *last = NULL;; |
2294 | ||
56bec294 CM |
2295 | /* |
2296 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2297 | * this prevents ref count from going down to zero when | |
2298 | * there still are pending delayed ref. | |
2299 | */ | |
d7df2c79 JB |
2300 | node = rb_first(&head->ref_root); |
2301 | while (node) { | |
56bec294 CM |
2302 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
2303 | rb_node); | |
d7df2c79 | 2304 | if (ref->action == BTRFS_ADD_DELAYED_REF) |
56bec294 | 2305 | return ref; |
d7df2c79 JB |
2306 | else if (last == NULL) |
2307 | last = ref; | |
2308 | node = rb_next(node); | |
56bec294 | 2309 | } |
d7df2c79 | 2310 | return last; |
56bec294 CM |
2311 | } |
2312 | ||
79787eaa JM |
2313 | /* |
2314 | * Returns 0 on success or if called with an already aborted transaction. | |
2315 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2316 | */ | |
d7df2c79 JB |
2317 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
2318 | struct btrfs_root *root, | |
2319 | unsigned long nr) | |
56bec294 | 2320 | { |
56bec294 CM |
2321 | struct btrfs_delayed_ref_root *delayed_refs; |
2322 | struct btrfs_delayed_ref_node *ref; | |
2323 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2324 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2325 | struct btrfs_fs_info *fs_info = root->fs_info; |
0a2b2a84 | 2326 | ktime_t start = ktime_get(); |
56bec294 | 2327 | int ret; |
d7df2c79 | 2328 | unsigned long count = 0; |
0a2b2a84 | 2329 | unsigned long actual_count = 0; |
56bec294 | 2330 | int must_insert_reserved = 0; |
56bec294 CM |
2331 | |
2332 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2333 | while (1) { |
2334 | if (!locked_ref) { | |
d7df2c79 | 2335 | if (count >= nr) |
56bec294 | 2336 | break; |
56bec294 | 2337 | |
d7df2c79 JB |
2338 | spin_lock(&delayed_refs->lock); |
2339 | locked_ref = btrfs_select_ref_head(trans); | |
2340 | if (!locked_ref) { | |
2341 | spin_unlock(&delayed_refs->lock); | |
2342 | break; | |
2343 | } | |
c3e69d58 CM |
2344 | |
2345 | /* grab the lock that says we are going to process | |
2346 | * all the refs for this head */ | |
2347 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
d7df2c79 | 2348 | spin_unlock(&delayed_refs->lock); |
c3e69d58 CM |
2349 | /* |
2350 | * we may have dropped the spin lock to get the head | |
2351 | * mutex lock, and that might have given someone else | |
2352 | * time to free the head. If that's true, it has been | |
2353 | * removed from our list and we can move on. | |
2354 | */ | |
2355 | if (ret == -EAGAIN) { | |
2356 | locked_ref = NULL; | |
2357 | count++; | |
2358 | continue; | |
56bec294 CM |
2359 | } |
2360 | } | |
a28ec197 | 2361 | |
ae1e206b JB |
2362 | /* |
2363 | * We need to try and merge add/drops of the same ref since we | |
2364 | * can run into issues with relocate dropping the implicit ref | |
2365 | * and then it being added back again before the drop can | |
2366 | * finish. If we merged anything we need to re-loop so we can | |
2367 | * get a good ref. | |
2368 | */ | |
d7df2c79 | 2369 | spin_lock(&locked_ref->lock); |
ae1e206b JB |
2370 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, |
2371 | locked_ref); | |
2372 | ||
d1270cd9 AJ |
2373 | /* |
2374 | * locked_ref is the head node, so we have to go one | |
2375 | * node back for any delayed ref updates | |
2376 | */ | |
2377 | ref = select_delayed_ref(locked_ref); | |
2378 | ||
2379 | if (ref && ref->seq && | |
097b8a7c | 2380 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d7df2c79 | 2381 | spin_unlock(&locked_ref->lock); |
093486c4 | 2382 | btrfs_delayed_ref_unlock(locked_ref); |
d7df2c79 JB |
2383 | spin_lock(&delayed_refs->lock); |
2384 | locked_ref->processing = 0; | |
d1270cd9 AJ |
2385 | delayed_refs->num_heads_ready++; |
2386 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2387 | locked_ref = NULL; |
d1270cd9 | 2388 | cond_resched(); |
27a377db | 2389 | count++; |
d1270cd9 AJ |
2390 | continue; |
2391 | } | |
2392 | ||
56bec294 CM |
2393 | /* |
2394 | * record the must insert reserved flag before we | |
2395 | * drop the spin lock. | |
2396 | */ | |
2397 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2398 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2399 | |
5d4f98a2 YZ |
2400 | extent_op = locked_ref->extent_op; |
2401 | locked_ref->extent_op = NULL; | |
2402 | ||
56bec294 | 2403 | if (!ref) { |
d7df2c79 JB |
2404 | |
2405 | ||
56bec294 CM |
2406 | /* All delayed refs have been processed, Go ahead |
2407 | * and send the head node to run_one_delayed_ref, | |
2408 | * so that any accounting fixes can happen | |
2409 | */ | |
2410 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2411 | |
2412 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2413 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2414 | extent_op = NULL; |
2415 | } | |
2416 | ||
2417 | if (extent_op) { | |
d7df2c79 | 2418 | spin_unlock(&locked_ref->lock); |
5d4f98a2 YZ |
2419 | ret = run_delayed_extent_op(trans, root, |
2420 | ref, extent_op); | |
78a6184a | 2421 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2422 | |
79787eaa | 2423 | if (ret) { |
857cc2fc JB |
2424 | /* |
2425 | * Need to reset must_insert_reserved if | |
2426 | * there was an error so the abort stuff | |
2427 | * can cleanup the reserved space | |
2428 | * properly. | |
2429 | */ | |
2430 | if (must_insert_reserved) | |
2431 | locked_ref->must_insert_reserved = 1; | |
d7df2c79 | 2432 | locked_ref->processing = 0; |
c2cf52eb | 2433 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); |
093486c4 | 2434 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2435 | return ret; |
2436 | } | |
d7df2c79 | 2437 | continue; |
5d4f98a2 | 2438 | } |
02217ed2 | 2439 | |
d7df2c79 JB |
2440 | /* |
2441 | * Need to drop our head ref lock and re-aqcuire the | |
2442 | * delayed ref lock and then re-check to make sure | |
2443 | * nobody got added. | |
2444 | */ | |
2445 | spin_unlock(&locked_ref->lock); | |
2446 | spin_lock(&delayed_refs->lock); | |
2447 | spin_lock(&locked_ref->lock); | |
573a0755 JB |
2448 | if (rb_first(&locked_ref->ref_root) || |
2449 | locked_ref->extent_op) { | |
d7df2c79 JB |
2450 | spin_unlock(&locked_ref->lock); |
2451 | spin_unlock(&delayed_refs->lock); | |
2452 | continue; | |
2453 | } | |
2454 | ref->in_tree = 0; | |
2455 | delayed_refs->num_heads--; | |
c46effa6 LB |
2456 | rb_erase(&locked_ref->href_node, |
2457 | &delayed_refs->href_root); | |
d7df2c79 JB |
2458 | spin_unlock(&delayed_refs->lock); |
2459 | } else { | |
0a2b2a84 | 2460 | actual_count++; |
d7df2c79 JB |
2461 | ref->in_tree = 0; |
2462 | rb_erase(&ref->rb_node, &locked_ref->ref_root); | |
c46effa6 | 2463 | } |
d7df2c79 JB |
2464 | atomic_dec(&delayed_refs->num_entries); |
2465 | ||
093486c4 | 2466 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2467 | /* |
2468 | * when we play the delayed ref, also correct the | |
2469 | * ref_mod on head | |
2470 | */ | |
2471 | switch (ref->action) { | |
2472 | case BTRFS_ADD_DELAYED_REF: | |
2473 | case BTRFS_ADD_DELAYED_EXTENT: | |
2474 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2475 | break; | |
2476 | case BTRFS_DROP_DELAYED_REF: | |
2477 | locked_ref->node.ref_mod += ref->ref_mod; | |
2478 | break; | |
2479 | default: | |
2480 | WARN_ON(1); | |
2481 | } | |
2482 | } | |
d7df2c79 | 2483 | spin_unlock(&locked_ref->lock); |
925baedd | 2484 | |
5d4f98a2 | 2485 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2486 | must_insert_reserved); |
eb099670 | 2487 | |
78a6184a | 2488 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2489 | if (ret) { |
d7df2c79 | 2490 | locked_ref->processing = 0; |
093486c4 MX |
2491 | btrfs_delayed_ref_unlock(locked_ref); |
2492 | btrfs_put_delayed_ref(ref); | |
c2cf52eb | 2493 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); |
79787eaa JM |
2494 | return ret; |
2495 | } | |
2496 | ||
093486c4 MX |
2497 | /* |
2498 | * If this node is a head, that means all the refs in this head | |
2499 | * have been dealt with, and we will pick the next head to deal | |
2500 | * with, so we must unlock the head and drop it from the cluster | |
2501 | * list before we release it. | |
2502 | */ | |
2503 | if (btrfs_delayed_ref_is_head(ref)) { | |
093486c4 MX |
2504 | btrfs_delayed_ref_unlock(locked_ref); |
2505 | locked_ref = NULL; | |
2506 | } | |
2507 | btrfs_put_delayed_ref(ref); | |
2508 | count++; | |
c3e69d58 | 2509 | cond_resched(); |
c3e69d58 | 2510 | } |
0a2b2a84 JB |
2511 | |
2512 | /* | |
2513 | * We don't want to include ref heads since we can have empty ref heads | |
2514 | * and those will drastically skew our runtime down since we just do | |
2515 | * accounting, no actual extent tree updates. | |
2516 | */ | |
2517 | if (actual_count > 0) { | |
2518 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2519 | u64 avg; | |
2520 | ||
2521 | /* | |
2522 | * We weigh the current average higher than our current runtime | |
2523 | * to avoid large swings in the average. | |
2524 | */ | |
2525 | spin_lock(&delayed_refs->lock); | |
2526 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
2527 | avg = div64_u64(avg, 4); | |
2528 | fs_info->avg_delayed_ref_runtime = avg; | |
2529 | spin_unlock(&delayed_refs->lock); | |
2530 | } | |
d7df2c79 | 2531 | return 0; |
c3e69d58 CM |
2532 | } |
2533 | ||
709c0486 AJ |
2534 | #ifdef SCRAMBLE_DELAYED_REFS |
2535 | /* | |
2536 | * Normally delayed refs get processed in ascending bytenr order. This | |
2537 | * correlates in most cases to the order added. To expose dependencies on this | |
2538 | * order, we start to process the tree in the middle instead of the beginning | |
2539 | */ | |
2540 | static u64 find_middle(struct rb_root *root) | |
2541 | { | |
2542 | struct rb_node *n = root->rb_node; | |
2543 | struct btrfs_delayed_ref_node *entry; | |
2544 | int alt = 1; | |
2545 | u64 middle; | |
2546 | u64 first = 0, last = 0; | |
2547 | ||
2548 | n = rb_first(root); | |
2549 | if (n) { | |
2550 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2551 | first = entry->bytenr; | |
2552 | } | |
2553 | n = rb_last(root); | |
2554 | if (n) { | |
2555 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2556 | last = entry->bytenr; | |
2557 | } | |
2558 | n = root->rb_node; | |
2559 | ||
2560 | while (n) { | |
2561 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2562 | WARN_ON(!entry->in_tree); | |
2563 | ||
2564 | middle = entry->bytenr; | |
2565 | ||
2566 | if (alt) | |
2567 | n = n->rb_left; | |
2568 | else | |
2569 | n = n->rb_right; | |
2570 | ||
2571 | alt = 1 - alt; | |
2572 | } | |
2573 | return middle; | |
2574 | } | |
2575 | #endif | |
2576 | ||
bed92eae AJ |
2577 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2578 | struct btrfs_fs_info *fs_info) | |
2579 | { | |
2580 | struct qgroup_update *qgroup_update; | |
2581 | int ret = 0; | |
2582 | ||
2583 | if (list_empty(&trans->qgroup_ref_list) != | |
2584 | !trans->delayed_ref_elem.seq) { | |
2585 | /* list without seq or seq without list */ | |
c2cf52eb | 2586 | btrfs_err(fs_info, |
fc36ed7e | 2587 | "qgroup accounting update error, list is%s empty, seq is %#x.%x", |
bed92eae | 2588 | list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2589 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2590 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2591 | BUG(); |
2592 | } | |
2593 | ||
2594 | if (!trans->delayed_ref_elem.seq) | |
2595 | return 0; | |
2596 | ||
2597 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2598 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2599 | struct qgroup_update, list); | |
2600 | list_del(&qgroup_update->list); | |
2601 | if (!ret) | |
2602 | ret = btrfs_qgroup_account_ref( | |
2603 | trans, fs_info, qgroup_update->node, | |
2604 | qgroup_update->extent_op); | |
2605 | kfree(qgroup_update); | |
2606 | } | |
2607 | ||
2608 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2609 | ||
2610 | return ret; | |
2611 | } | |
2612 | ||
1be41b78 JB |
2613 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) |
2614 | { | |
2615 | u64 num_bytes; | |
2616 | ||
2617 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2618 | sizeof(struct btrfs_extent_inline_ref)); | |
2619 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2620 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2621 | ||
2622 | /* | |
2623 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2624 | * closer to what we're really going to want to ouse. | |
2625 | */ | |
2626 | return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); | |
2627 | } | |
2628 | ||
0a2b2a84 | 2629 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
1be41b78 JB |
2630 | struct btrfs_root *root) |
2631 | { | |
2632 | struct btrfs_block_rsv *global_rsv; | |
2633 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
2634 | u64 num_bytes; | |
2635 | int ret = 0; | |
2636 | ||
2637 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2638 | num_heads = heads_to_leaves(root, num_heads); | |
2639 | if (num_heads > 1) | |
2640 | num_bytes += (num_heads - 1) * root->leafsize; | |
2641 | num_bytes <<= 1; | |
2642 | global_rsv = &root->fs_info->global_block_rsv; | |
2643 | ||
2644 | /* | |
2645 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2646 | * wiggle room since running delayed refs can create more delayed refs. | |
2647 | */ | |
2648 | if (global_rsv->space_info->full) | |
2649 | num_bytes <<= 1; | |
2650 | ||
2651 | spin_lock(&global_rsv->lock); | |
2652 | if (global_rsv->reserved <= num_bytes) | |
2653 | ret = 1; | |
2654 | spin_unlock(&global_rsv->lock); | |
2655 | return ret; | |
2656 | } | |
2657 | ||
0a2b2a84 JB |
2658 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
2659 | struct btrfs_root *root) | |
2660 | { | |
2661 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2662 | u64 num_entries = | |
2663 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2664 | u64 avg_runtime; | |
2665 | ||
2666 | smp_mb(); | |
2667 | avg_runtime = fs_info->avg_delayed_ref_runtime; | |
2668 | if (num_entries * avg_runtime >= NSEC_PER_SEC) | |
2669 | return 1; | |
2670 | ||
2671 | return btrfs_check_space_for_delayed_refs(trans, root); | |
2672 | } | |
2673 | ||
c3e69d58 CM |
2674 | /* |
2675 | * this starts processing the delayed reference count updates and | |
2676 | * extent insertions we have queued up so far. count can be | |
2677 | * 0, which means to process everything in the tree at the start | |
2678 | * of the run (but not newly added entries), or it can be some target | |
2679 | * number you'd like to process. | |
79787eaa JM |
2680 | * |
2681 | * Returns 0 on success or if called with an aborted transaction | |
2682 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2683 | */ |
2684 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2685 | struct btrfs_root *root, unsigned long count) | |
2686 | { | |
2687 | struct rb_node *node; | |
2688 | struct btrfs_delayed_ref_root *delayed_refs; | |
c46effa6 | 2689 | struct btrfs_delayed_ref_head *head; |
c3e69d58 CM |
2690 | int ret; |
2691 | int run_all = count == (unsigned long)-1; | |
2692 | int run_most = 0; | |
2693 | ||
79787eaa JM |
2694 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2695 | if (trans->aborted) | |
2696 | return 0; | |
2697 | ||
c3e69d58 CM |
2698 | if (root == root->fs_info->extent_root) |
2699 | root = root->fs_info->tree_root; | |
2700 | ||
edf39272 JS |
2701 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2702 | ||
c3e69d58 | 2703 | delayed_refs = &trans->transaction->delayed_refs; |
bb721703 | 2704 | if (count == 0) { |
d7df2c79 | 2705 | count = atomic_read(&delayed_refs->num_entries) * 2; |
bb721703 CM |
2706 | run_most = 1; |
2707 | } | |
2708 | ||
c3e69d58 | 2709 | again: |
709c0486 AJ |
2710 | #ifdef SCRAMBLE_DELAYED_REFS |
2711 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2712 | #endif | |
d7df2c79 JB |
2713 | ret = __btrfs_run_delayed_refs(trans, root, count); |
2714 | if (ret < 0) { | |
2715 | btrfs_abort_transaction(trans, root, ret); | |
2716 | return ret; | |
eb099670 | 2717 | } |
c3e69d58 | 2718 | |
56bec294 | 2719 | if (run_all) { |
d7df2c79 | 2720 | if (!list_empty(&trans->new_bgs)) |
ea658bad | 2721 | btrfs_create_pending_block_groups(trans, root); |
ea658bad | 2722 | |
d7df2c79 | 2723 | spin_lock(&delayed_refs->lock); |
c46effa6 | 2724 | node = rb_first(&delayed_refs->href_root); |
d7df2c79 JB |
2725 | if (!node) { |
2726 | spin_unlock(&delayed_refs->lock); | |
56bec294 | 2727 | goto out; |
d7df2c79 | 2728 | } |
c3e69d58 | 2729 | count = (unsigned long)-1; |
e9d0b13b | 2730 | |
56bec294 | 2731 | while (node) { |
c46effa6 LB |
2732 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
2733 | href_node); | |
2734 | if (btrfs_delayed_ref_is_head(&head->node)) { | |
2735 | struct btrfs_delayed_ref_node *ref; | |
5caf2a00 | 2736 | |
c46effa6 | 2737 | ref = &head->node; |
56bec294 CM |
2738 | atomic_inc(&ref->refs); |
2739 | ||
2740 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2741 | /* |
2742 | * Mutex was contended, block until it's | |
2743 | * released and try again | |
2744 | */ | |
56bec294 CM |
2745 | mutex_lock(&head->mutex); |
2746 | mutex_unlock(&head->mutex); | |
2747 | ||
2748 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2749 | cond_resched(); |
56bec294 | 2750 | goto again; |
c46effa6 LB |
2751 | } else { |
2752 | WARN_ON(1); | |
56bec294 CM |
2753 | } |
2754 | node = rb_next(node); | |
2755 | } | |
2756 | spin_unlock(&delayed_refs->lock); | |
d7df2c79 | 2757 | cond_resched(); |
56bec294 | 2758 | goto again; |
5f39d397 | 2759 | } |
54aa1f4d | 2760 | out: |
edf39272 | 2761 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2762 | return 0; |
2763 | } | |
2764 | ||
5d4f98a2 YZ |
2765 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2766 | struct btrfs_root *root, | |
2767 | u64 bytenr, u64 num_bytes, u64 flags, | |
b1c79e09 | 2768 | int level, int is_data) |
5d4f98a2 YZ |
2769 | { |
2770 | struct btrfs_delayed_extent_op *extent_op; | |
2771 | int ret; | |
2772 | ||
78a6184a | 2773 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2774 | if (!extent_op) |
2775 | return -ENOMEM; | |
2776 | ||
2777 | extent_op->flags_to_set = flags; | |
2778 | extent_op->update_flags = 1; | |
2779 | extent_op->update_key = 0; | |
2780 | extent_op->is_data = is_data ? 1 : 0; | |
b1c79e09 | 2781 | extent_op->level = level; |
5d4f98a2 | 2782 | |
66d7e7f0 AJ |
2783 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2784 | num_bytes, extent_op); | |
5d4f98a2 | 2785 | if (ret) |
78a6184a | 2786 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2787 | return ret; |
2788 | } | |
2789 | ||
2790 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2791 | struct btrfs_root *root, | |
2792 | struct btrfs_path *path, | |
2793 | u64 objectid, u64 offset, u64 bytenr) | |
2794 | { | |
2795 | struct btrfs_delayed_ref_head *head; | |
2796 | struct btrfs_delayed_ref_node *ref; | |
2797 | struct btrfs_delayed_data_ref *data_ref; | |
2798 | struct btrfs_delayed_ref_root *delayed_refs; | |
2799 | struct rb_node *node; | |
2800 | int ret = 0; | |
2801 | ||
5d4f98a2 YZ |
2802 | delayed_refs = &trans->transaction->delayed_refs; |
2803 | spin_lock(&delayed_refs->lock); | |
2804 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
d7df2c79 JB |
2805 | if (!head) { |
2806 | spin_unlock(&delayed_refs->lock); | |
2807 | return 0; | |
2808 | } | |
5d4f98a2 YZ |
2809 | |
2810 | if (!mutex_trylock(&head->mutex)) { | |
2811 | atomic_inc(&head->node.refs); | |
2812 | spin_unlock(&delayed_refs->lock); | |
2813 | ||
b3b4aa74 | 2814 | btrfs_release_path(path); |
5d4f98a2 | 2815 | |
8cc33e5c DS |
2816 | /* |
2817 | * Mutex was contended, block until it's released and let | |
2818 | * caller try again | |
2819 | */ | |
5d4f98a2 YZ |
2820 | mutex_lock(&head->mutex); |
2821 | mutex_unlock(&head->mutex); | |
2822 | btrfs_put_delayed_ref(&head->node); | |
2823 | return -EAGAIN; | |
2824 | } | |
d7df2c79 | 2825 | spin_unlock(&delayed_refs->lock); |
5d4f98a2 | 2826 | |
d7df2c79 JB |
2827 | spin_lock(&head->lock); |
2828 | node = rb_first(&head->ref_root); | |
2829 | while (node) { | |
2830 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2831 | node = rb_next(node); | |
5d4f98a2 | 2832 | |
d7df2c79 JB |
2833 | /* If it's a shared ref we know a cross reference exists */ |
2834 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
2835 | ret = 1; | |
2836 | break; | |
2837 | } | |
5d4f98a2 | 2838 | |
d7df2c79 | 2839 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
5d4f98a2 | 2840 | |
d7df2c79 JB |
2841 | /* |
2842 | * If our ref doesn't match the one we're currently looking at | |
2843 | * then we have a cross reference. | |
2844 | */ | |
2845 | if (data_ref->root != root->root_key.objectid || | |
2846 | data_ref->objectid != objectid || | |
2847 | data_ref->offset != offset) { | |
2848 | ret = 1; | |
2849 | break; | |
2850 | } | |
5d4f98a2 | 2851 | } |
d7df2c79 | 2852 | spin_unlock(&head->lock); |
5d4f98a2 | 2853 | mutex_unlock(&head->mutex); |
5d4f98a2 YZ |
2854 | return ret; |
2855 | } | |
2856 | ||
2857 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2858 | struct btrfs_root *root, | |
2859 | struct btrfs_path *path, | |
2860 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2861 | { |
2862 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2863 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2864 | struct btrfs_extent_data_ref *ref; |
2865 | struct btrfs_extent_inline_ref *iref; | |
2866 | struct btrfs_extent_item *ei; | |
f321e491 | 2867 | struct btrfs_key key; |
5d4f98a2 | 2868 | u32 item_size; |
be20aa9d | 2869 | int ret; |
925baedd | 2870 | |
be20aa9d | 2871 | key.objectid = bytenr; |
31840ae1 | 2872 | key.offset = (u64)-1; |
f321e491 | 2873 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2874 | |
be20aa9d CM |
2875 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2876 | if (ret < 0) | |
2877 | goto out; | |
79787eaa | 2878 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2879 | |
2880 | ret = -ENOENT; | |
2881 | if (path->slots[0] == 0) | |
31840ae1 | 2882 | goto out; |
be20aa9d | 2883 | |
31840ae1 | 2884 | path->slots[0]--; |
f321e491 | 2885 | leaf = path->nodes[0]; |
5d4f98a2 | 2886 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2887 | |
5d4f98a2 | 2888 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2889 | goto out; |
f321e491 | 2890 | |
5d4f98a2 YZ |
2891 | ret = 1; |
2892 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2893 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2894 | if (item_size < sizeof(*ei)) { | |
2895 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2896 | goto out; | |
2897 | } | |
2898 | #endif | |
2899 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2900 | |
5d4f98a2 YZ |
2901 | if (item_size != sizeof(*ei) + |
2902 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2903 | goto out; | |
be20aa9d | 2904 | |
5d4f98a2 YZ |
2905 | if (btrfs_extent_generation(leaf, ei) <= |
2906 | btrfs_root_last_snapshot(&root->root_item)) | |
2907 | goto out; | |
2908 | ||
2909 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2910 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2911 | BTRFS_EXTENT_DATA_REF_KEY) | |
2912 | goto out; | |
2913 | ||
2914 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2915 | if (btrfs_extent_refs(leaf, ei) != | |
2916 | btrfs_extent_data_ref_count(leaf, ref) || | |
2917 | btrfs_extent_data_ref_root(leaf, ref) != | |
2918 | root->root_key.objectid || | |
2919 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2920 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2921 | goto out; | |
2922 | ||
2923 | ret = 0; | |
2924 | out: | |
2925 | return ret; | |
2926 | } | |
2927 | ||
2928 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2929 | struct btrfs_root *root, | |
2930 | u64 objectid, u64 offset, u64 bytenr) | |
2931 | { | |
2932 | struct btrfs_path *path; | |
2933 | int ret; | |
2934 | int ret2; | |
2935 | ||
2936 | path = btrfs_alloc_path(); | |
2937 | if (!path) | |
2938 | return -ENOENT; | |
2939 | ||
2940 | do { | |
2941 | ret = check_committed_ref(trans, root, path, objectid, | |
2942 | offset, bytenr); | |
2943 | if (ret && ret != -ENOENT) | |
f321e491 | 2944 | goto out; |
80ff3856 | 2945 | |
5d4f98a2 YZ |
2946 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2947 | offset, bytenr); | |
2948 | } while (ret2 == -EAGAIN); | |
2949 | ||
2950 | if (ret2 && ret2 != -ENOENT) { | |
2951 | ret = ret2; | |
2952 | goto out; | |
f321e491 | 2953 | } |
5d4f98a2 YZ |
2954 | |
2955 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2956 | ret = 0; | |
be20aa9d | 2957 | out: |
80ff3856 | 2958 | btrfs_free_path(path); |
f0486c68 YZ |
2959 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2960 | WARN_ON(ret > 0); | |
f321e491 | 2961 | return ret; |
be20aa9d | 2962 | } |
c5739bba | 2963 | |
5d4f98a2 | 2964 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2965 | struct btrfs_root *root, |
5d4f98a2 | 2966 | struct extent_buffer *buf, |
66d7e7f0 | 2967 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2968 | { |
2969 | u64 bytenr; | |
5d4f98a2 YZ |
2970 | u64 num_bytes; |
2971 | u64 parent; | |
31840ae1 | 2972 | u64 ref_root; |
31840ae1 | 2973 | u32 nritems; |
31840ae1 ZY |
2974 | struct btrfs_key key; |
2975 | struct btrfs_file_extent_item *fi; | |
2976 | int i; | |
2977 | int level; | |
2978 | int ret = 0; | |
31840ae1 | 2979 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2980 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2981 | |
2982 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2983 | nritems = btrfs_header_nritems(buf); |
2984 | level = btrfs_header_level(buf); | |
2985 | ||
5d4f98a2 YZ |
2986 | if (!root->ref_cows && level == 0) |
2987 | return 0; | |
31840ae1 | 2988 | |
5d4f98a2 YZ |
2989 | if (inc) |
2990 | process_func = btrfs_inc_extent_ref; | |
2991 | else | |
2992 | process_func = btrfs_free_extent; | |
31840ae1 | 2993 | |
5d4f98a2 YZ |
2994 | if (full_backref) |
2995 | parent = buf->start; | |
2996 | else | |
2997 | parent = 0; | |
2998 | ||
2999 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3000 | if (level == 0) { |
5d4f98a2 | 3001 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
3002 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
3003 | continue; | |
5d4f98a2 | 3004 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3005 | struct btrfs_file_extent_item); |
3006 | if (btrfs_file_extent_type(buf, fi) == | |
3007 | BTRFS_FILE_EXTENT_INLINE) | |
3008 | continue; | |
3009 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3010 | if (bytenr == 0) | |
3011 | continue; | |
5d4f98a2 YZ |
3012 | |
3013 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3014 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3015 | ret = process_func(trans, root, bytenr, num_bytes, | |
3016 | parent, ref_root, key.objectid, | |
66d7e7f0 | 3017 | key.offset, for_cow); |
31840ae1 ZY |
3018 | if (ret) |
3019 | goto fail; | |
3020 | } else { | |
5d4f98a2 YZ |
3021 | bytenr = btrfs_node_blockptr(buf, i); |
3022 | num_bytes = btrfs_level_size(root, level - 1); | |
3023 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
3024 | parent, ref_root, level - 1, 0, |
3025 | for_cow); | |
31840ae1 ZY |
3026 | if (ret) |
3027 | goto fail; | |
3028 | } | |
3029 | } | |
3030 | return 0; | |
3031 | fail: | |
5d4f98a2 YZ |
3032 | return ret; |
3033 | } | |
3034 | ||
3035 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3036 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3037 | { |
66d7e7f0 | 3038 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
3039 | } |
3040 | ||
3041 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 3042 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 3043 | { |
66d7e7f0 | 3044 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
3045 | } |
3046 | ||
9078a3e1 CM |
3047 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
3048 | struct btrfs_root *root, | |
3049 | struct btrfs_path *path, | |
3050 | struct btrfs_block_group_cache *cache) | |
3051 | { | |
3052 | int ret; | |
9078a3e1 | 3053 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
3054 | unsigned long bi; |
3055 | struct extent_buffer *leaf; | |
9078a3e1 | 3056 | |
9078a3e1 | 3057 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
3058 | if (ret < 0) |
3059 | goto fail; | |
79787eaa | 3060 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
3061 | |
3062 | leaf = path->nodes[0]; | |
3063 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3064 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3065 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3066 | btrfs_release_path(path); |
54aa1f4d | 3067 | fail: |
79787eaa JM |
3068 | if (ret) { |
3069 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 3070 | return ret; |
79787eaa | 3071 | } |
9078a3e1 CM |
3072 | return 0; |
3073 | ||
3074 | } | |
3075 | ||
4a8c9a62 YZ |
3076 | static struct btrfs_block_group_cache * |
3077 | next_block_group(struct btrfs_root *root, | |
3078 | struct btrfs_block_group_cache *cache) | |
3079 | { | |
3080 | struct rb_node *node; | |
3081 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3082 | node = rb_next(&cache->cache_node); | |
3083 | btrfs_put_block_group(cache); | |
3084 | if (node) { | |
3085 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3086 | cache_node); | |
11dfe35a | 3087 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3088 | } else |
3089 | cache = NULL; | |
3090 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3091 | return cache; | |
3092 | } | |
3093 | ||
0af3d00b JB |
3094 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3095 | struct btrfs_trans_handle *trans, | |
3096 | struct btrfs_path *path) | |
3097 | { | |
3098 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3099 | struct inode *inode = NULL; | |
3100 | u64 alloc_hint = 0; | |
2b20982e | 3101 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
3102 | int num_pages = 0; |
3103 | int retries = 0; | |
3104 | int ret = 0; | |
3105 | ||
3106 | /* | |
3107 | * If this block group is smaller than 100 megs don't bother caching the | |
3108 | * block group. | |
3109 | */ | |
3110 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3111 | spin_lock(&block_group->lock); | |
3112 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3113 | spin_unlock(&block_group->lock); | |
3114 | return 0; | |
3115 | } | |
3116 | ||
3117 | again: | |
3118 | inode = lookup_free_space_inode(root, block_group, path); | |
3119 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3120 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3121 | btrfs_release_path(path); |
0af3d00b JB |
3122 | goto out; |
3123 | } | |
3124 | ||
3125 | if (IS_ERR(inode)) { | |
3126 | BUG_ON(retries); | |
3127 | retries++; | |
3128 | ||
3129 | if (block_group->ro) | |
3130 | goto out_free; | |
3131 | ||
3132 | ret = create_free_space_inode(root, trans, block_group, path); | |
3133 | if (ret) | |
3134 | goto out_free; | |
3135 | goto again; | |
3136 | } | |
3137 | ||
5b0e95bf JB |
3138 | /* We've already setup this transaction, go ahead and exit */ |
3139 | if (block_group->cache_generation == trans->transid && | |
3140 | i_size_read(inode)) { | |
3141 | dcs = BTRFS_DC_SETUP; | |
3142 | goto out_put; | |
3143 | } | |
3144 | ||
0af3d00b JB |
3145 | /* |
3146 | * We want to set the generation to 0, that way if anything goes wrong | |
3147 | * from here on out we know not to trust this cache when we load up next | |
3148 | * time. | |
3149 | */ | |
3150 | BTRFS_I(inode)->generation = 0; | |
3151 | ret = btrfs_update_inode(trans, root, inode); | |
3152 | WARN_ON(ret); | |
3153 | ||
3154 | if (i_size_read(inode) > 0) { | |
7b61cd92 MX |
3155 | ret = btrfs_check_trunc_cache_free_space(root, |
3156 | &root->fs_info->global_block_rsv); | |
3157 | if (ret) | |
3158 | goto out_put; | |
3159 | ||
74514323 | 3160 | ret = btrfs_truncate_free_space_cache(root, trans, inode); |
0af3d00b JB |
3161 | if (ret) |
3162 | goto out_put; | |
3163 | } | |
3164 | ||
3165 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3166 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3167 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3168 | /* | |
3169 | * don't bother trying to write stuff out _if_ | |
3170 | * a) we're not cached, | |
3171 | * b) we're with nospace_cache mount option. | |
3172 | */ | |
2b20982e | 3173 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3174 | spin_unlock(&block_group->lock); |
3175 | goto out_put; | |
3176 | } | |
3177 | spin_unlock(&block_group->lock); | |
3178 | ||
6fc823b1 JB |
3179 | /* |
3180 | * Try to preallocate enough space based on how big the block group is. | |
3181 | * Keep in mind this has to include any pinned space which could end up | |
3182 | * taking up quite a bit since it's not folded into the other space | |
3183 | * cache. | |
3184 | */ | |
3185 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3186 | if (!num_pages) |
3187 | num_pages = 1; | |
3188 | ||
0af3d00b JB |
3189 | num_pages *= 16; |
3190 | num_pages *= PAGE_CACHE_SIZE; | |
3191 | ||
3192 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3193 | if (ret) | |
3194 | goto out_put; | |
3195 | ||
3196 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3197 | num_pages, num_pages, | |
3198 | &alloc_hint); | |
2b20982e JB |
3199 | if (!ret) |
3200 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3201 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3202 | |
0af3d00b JB |
3203 | out_put: |
3204 | iput(inode); | |
3205 | out_free: | |
b3b4aa74 | 3206 | btrfs_release_path(path); |
0af3d00b JB |
3207 | out: |
3208 | spin_lock(&block_group->lock); | |
e65cbb94 | 3209 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3210 | block_group->cache_generation = trans->transid; |
2b20982e | 3211 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3212 | spin_unlock(&block_group->lock); |
3213 | ||
3214 | return ret; | |
3215 | } | |
3216 | ||
96b5179d CM |
3217 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3218 | struct btrfs_root *root) | |
9078a3e1 | 3219 | { |
4a8c9a62 | 3220 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3221 | int err = 0; |
9078a3e1 | 3222 | struct btrfs_path *path; |
96b5179d | 3223 | u64 last = 0; |
9078a3e1 CM |
3224 | |
3225 | path = btrfs_alloc_path(); | |
3226 | if (!path) | |
3227 | return -ENOMEM; | |
3228 | ||
0af3d00b JB |
3229 | again: |
3230 | while (1) { | |
3231 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3232 | while (cache) { | |
3233 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3234 | break; | |
3235 | cache = next_block_group(root, cache); | |
3236 | } | |
3237 | if (!cache) { | |
3238 | if (last == 0) | |
3239 | break; | |
3240 | last = 0; | |
3241 | continue; | |
3242 | } | |
3243 | err = cache_save_setup(cache, trans, path); | |
3244 | last = cache->key.objectid + cache->key.offset; | |
3245 | btrfs_put_block_group(cache); | |
3246 | } | |
3247 | ||
d397712b | 3248 | while (1) { |
4a8c9a62 YZ |
3249 | if (last == 0) { |
3250 | err = btrfs_run_delayed_refs(trans, root, | |
3251 | (unsigned long)-1); | |
79787eaa JM |
3252 | if (err) /* File system offline */ |
3253 | goto out; | |
0f9dd46c | 3254 | } |
54aa1f4d | 3255 | |
4a8c9a62 YZ |
3256 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3257 | while (cache) { | |
0af3d00b JB |
3258 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3259 | btrfs_put_block_group(cache); | |
3260 | goto again; | |
3261 | } | |
3262 | ||
4a8c9a62 YZ |
3263 | if (cache->dirty) |
3264 | break; | |
3265 | cache = next_block_group(root, cache); | |
3266 | } | |
3267 | if (!cache) { | |
3268 | if (last == 0) | |
3269 | break; | |
3270 | last = 0; | |
3271 | continue; | |
3272 | } | |
0f9dd46c | 3273 | |
0cb59c99 JB |
3274 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3275 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3276 | cache->dirty = 0; |
4a8c9a62 | 3277 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3278 | |
4a8c9a62 | 3279 | err = write_one_cache_group(trans, root, path, cache); |
e84cc142 | 3280 | btrfs_put_block_group(cache); |
79787eaa JM |
3281 | if (err) /* File system offline */ |
3282 | goto out; | |
9078a3e1 | 3283 | } |
4a8c9a62 | 3284 | |
0cb59c99 JB |
3285 | while (1) { |
3286 | /* | |
3287 | * I don't think this is needed since we're just marking our | |
3288 | * preallocated extent as written, but just in case it can't | |
3289 | * hurt. | |
3290 | */ | |
3291 | if (last == 0) { | |
3292 | err = btrfs_run_delayed_refs(trans, root, | |
3293 | (unsigned long)-1); | |
79787eaa JM |
3294 | if (err) /* File system offline */ |
3295 | goto out; | |
0cb59c99 JB |
3296 | } |
3297 | ||
3298 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3299 | while (cache) { | |
3300 | /* | |
3301 | * Really this shouldn't happen, but it could if we | |
3302 | * couldn't write the entire preallocated extent and | |
3303 | * splitting the extent resulted in a new block. | |
3304 | */ | |
3305 | if (cache->dirty) { | |
3306 | btrfs_put_block_group(cache); | |
3307 | goto again; | |
3308 | } | |
3309 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3310 | break; | |
3311 | cache = next_block_group(root, cache); | |
3312 | } | |
3313 | if (!cache) { | |
3314 | if (last == 0) | |
3315 | break; | |
3316 | last = 0; | |
3317 | continue; | |
3318 | } | |
3319 | ||
79787eaa | 3320 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3321 | |
3322 | /* | |
3323 | * If we didn't have an error then the cache state is still | |
3324 | * NEED_WRITE, so we can set it to WRITTEN. | |
3325 | */ | |
79787eaa | 3326 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3327 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3328 | last = cache->key.objectid + cache->key.offset; | |
3329 | btrfs_put_block_group(cache); | |
3330 | } | |
79787eaa | 3331 | out: |
0cb59c99 | 3332 | |
9078a3e1 | 3333 | btrfs_free_path(path); |
79787eaa | 3334 | return err; |
9078a3e1 CM |
3335 | } |
3336 | ||
d2fb3437 YZ |
3337 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3338 | { | |
3339 | struct btrfs_block_group_cache *block_group; | |
3340 | int readonly = 0; | |
3341 | ||
3342 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3343 | if (!block_group || block_group->ro) | |
3344 | readonly = 1; | |
3345 | if (block_group) | |
fa9c0d79 | 3346 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3347 | return readonly; |
3348 | } | |
3349 | ||
6ab0a202 JM |
3350 | static const char *alloc_name(u64 flags) |
3351 | { | |
3352 | switch (flags) { | |
3353 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
3354 | return "mixed"; | |
3355 | case BTRFS_BLOCK_GROUP_METADATA: | |
3356 | return "metadata"; | |
3357 | case BTRFS_BLOCK_GROUP_DATA: | |
3358 | return "data"; | |
3359 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
3360 | return "system"; | |
3361 | default: | |
3362 | WARN_ON(1); | |
3363 | return "invalid-combination"; | |
3364 | }; | |
3365 | } | |
3366 | ||
593060d7 CM |
3367 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3368 | u64 total_bytes, u64 bytes_used, | |
3369 | struct btrfs_space_info **space_info) | |
3370 | { | |
3371 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3372 | int i; |
3373 | int factor; | |
b150a4f1 | 3374 | int ret; |
b742bb82 YZ |
3375 | |
3376 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3377 | BTRFS_BLOCK_GROUP_RAID10)) | |
3378 | factor = 2; | |
3379 | else | |
3380 | factor = 1; | |
593060d7 CM |
3381 | |
3382 | found = __find_space_info(info, flags); | |
3383 | if (found) { | |
25179201 | 3384 | spin_lock(&found->lock); |
593060d7 | 3385 | found->total_bytes += total_bytes; |
89a55897 | 3386 | found->disk_total += total_bytes * factor; |
593060d7 | 3387 | found->bytes_used += bytes_used; |
b742bb82 | 3388 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3389 | found->full = 0; |
25179201 | 3390 | spin_unlock(&found->lock); |
593060d7 CM |
3391 | *space_info = found; |
3392 | return 0; | |
3393 | } | |
c146afad | 3394 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3395 | if (!found) |
3396 | return -ENOMEM; | |
3397 | ||
b150a4f1 JB |
3398 | ret = percpu_counter_init(&found->total_bytes_pinned, 0); |
3399 | if (ret) { | |
3400 | kfree(found); | |
3401 | return ret; | |
3402 | } | |
3403 | ||
536cd964 | 3404 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
b742bb82 | 3405 | INIT_LIST_HEAD(&found->block_groups[i]); |
536cd964 MX |
3406 | kobject_init(&found->block_group_kobjs[i], &btrfs_raid_ktype); |
3407 | } | |
80eb234a | 3408 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3409 | spin_lock_init(&found->lock); |
52ba6929 | 3410 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3411 | found->total_bytes = total_bytes; |
89a55897 | 3412 | found->disk_total = total_bytes * factor; |
593060d7 | 3413 | found->bytes_used = bytes_used; |
b742bb82 | 3414 | found->disk_used = bytes_used * factor; |
593060d7 | 3415 | found->bytes_pinned = 0; |
e8569813 | 3416 | found->bytes_reserved = 0; |
c146afad | 3417 | found->bytes_readonly = 0; |
f0486c68 | 3418 | found->bytes_may_use = 0; |
593060d7 | 3419 | found->full = 0; |
0e4f8f88 | 3420 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3421 | found->chunk_alloc = 0; |
fdb5effd JB |
3422 | found->flush = 0; |
3423 | init_waitqueue_head(&found->wait); | |
6ab0a202 JM |
3424 | |
3425 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, | |
3426 | info->space_info_kobj, "%s", | |
3427 | alloc_name(found->flags)); | |
3428 | if (ret) { | |
3429 | kfree(found); | |
3430 | return ret; | |
3431 | } | |
3432 | ||
593060d7 | 3433 | *space_info = found; |
4184ea7f | 3434 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3435 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3436 | info->data_sinfo = found; | |
6ab0a202 JM |
3437 | |
3438 | return ret; | |
593060d7 CM |
3439 | } |
3440 | ||
8790d502 CM |
3441 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3442 | { | |
899c81ea ID |
3443 | u64 extra_flags = chunk_to_extended(flags) & |
3444 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3445 | |
de98ced9 | 3446 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3447 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3448 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3449 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3450 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3451 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3452 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3453 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3454 | } |
593060d7 | 3455 | |
fc67c450 ID |
3456 | /* |
3457 | * returns target flags in extended format or 0 if restripe for this | |
3458 | * chunk_type is not in progress | |
c6664b42 ID |
3459 | * |
3460 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3461 | */ |
3462 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3463 | { | |
3464 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3465 | u64 target = 0; | |
3466 | ||
fc67c450 ID |
3467 | if (!bctl) |
3468 | return 0; | |
3469 | ||
3470 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3471 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3472 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3473 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3474 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3475 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3476 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3477 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3478 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3479 | } | |
3480 | ||
3481 | return target; | |
3482 | } | |
3483 | ||
a46d11a8 ID |
3484 | /* |
3485 | * @flags: available profiles in extended format (see ctree.h) | |
3486 | * | |
e4d8ec0f ID |
3487 | * Returns reduced profile in chunk format. If profile changing is in |
3488 | * progress (either running or paused) picks the target profile (if it's | |
3489 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3490 | */ |
48a3b636 | 3491 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3492 | { |
cd02dca5 CM |
3493 | /* |
3494 | * we add in the count of missing devices because we want | |
3495 | * to make sure that any RAID levels on a degraded FS | |
3496 | * continue to be honored. | |
3497 | */ | |
3498 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3499 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3500 | u64 target; |
53b381b3 | 3501 | u64 tmp; |
a061fc8d | 3502 | |
fc67c450 ID |
3503 | /* |
3504 | * see if restripe for this chunk_type is in progress, if so | |
3505 | * try to reduce to the target profile | |
3506 | */ | |
e4d8ec0f | 3507 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3508 | target = get_restripe_target(root->fs_info, flags); |
3509 | if (target) { | |
3510 | /* pick target profile only if it's already available */ | |
3511 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3512 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3513 | return extended_to_chunk(target); |
e4d8ec0f ID |
3514 | } |
3515 | } | |
3516 | spin_unlock(&root->fs_info->balance_lock); | |
3517 | ||
53b381b3 | 3518 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3519 | if (num_devices == 1) |
53b381b3 DW |
3520 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3521 | BTRFS_BLOCK_GROUP_RAID5); | |
3522 | if (num_devices < 3) | |
3523 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3524 | if (num_devices < 4) |
3525 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3526 | ||
53b381b3 DW |
3527 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3528 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3529 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3530 | flags &= ~tmp; | |
ec44a35c | 3531 | |
53b381b3 DW |
3532 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3533 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3534 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3535 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3536 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3537 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3538 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3539 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3540 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3541 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3542 | |
53b381b3 | 3543 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3544 | } |
3545 | ||
f8213bdc | 3546 | static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags) |
6a63209f | 3547 | { |
de98ced9 | 3548 | unsigned seq; |
f8213bdc | 3549 | u64 flags; |
de98ced9 MX |
3550 | |
3551 | do { | |
f8213bdc | 3552 | flags = orig_flags; |
de98ced9 MX |
3553 | seq = read_seqbegin(&root->fs_info->profiles_lock); |
3554 | ||
3555 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3556 | flags |= root->fs_info->avail_data_alloc_bits; | |
3557 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3558 | flags |= root->fs_info->avail_system_alloc_bits; | |
3559 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3560 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3561 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3562 | |
b742bb82 | 3563 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3564 | } |
3565 | ||
6d07bcec | 3566 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3567 | { |
b742bb82 | 3568 | u64 flags; |
53b381b3 | 3569 | u64 ret; |
9ed74f2d | 3570 | |
b742bb82 YZ |
3571 | if (data) |
3572 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3573 | else if (root == root->fs_info->chunk_root) | |
3574 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3575 | else |
b742bb82 | 3576 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3577 | |
53b381b3 DW |
3578 | ret = get_alloc_profile(root, flags); |
3579 | return ret; | |
6a63209f | 3580 | } |
9ed74f2d | 3581 | |
6a63209f | 3582 | /* |
6a63209f JB |
3583 | * This will check the space that the inode allocates from to make sure we have |
3584 | * enough space for bytes. | |
6a63209f | 3585 | */ |
0ca1f7ce | 3586 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3587 | { |
6a63209f | 3588 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3589 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3590 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3591 | u64 used; |
0af3d00b | 3592 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3593 | |
6a63209f | 3594 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3595 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3596 | |
9dced186 | 3597 | if (btrfs_is_free_space_inode(inode)) { |
0af3d00b | 3598 | committed = 1; |
9dced186 | 3599 | ASSERT(current->journal_info); |
0af3d00b JB |
3600 | } |
3601 | ||
b4d7c3c9 | 3602 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3603 | if (!data_sinfo) |
3604 | goto alloc; | |
9ed74f2d | 3605 | |
6a63209f JB |
3606 | again: |
3607 | /* make sure we have enough space to handle the data first */ | |
3608 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3609 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3610 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3611 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3612 | |
3613 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3614 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3615 | |
6a63209f JB |
3616 | /* |
3617 | * if we don't have enough free bytes in this space then we need | |
3618 | * to alloc a new chunk. | |
3619 | */ | |
0af3d00b | 3620 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3621 | u64 alloc_target; |
9ed74f2d | 3622 | |
0e4f8f88 | 3623 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3624 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3625 | alloc: |
6a63209f | 3626 | alloc_target = btrfs_get_alloc_profile(root, 1); |
9dced186 MX |
3627 | /* |
3628 | * It is ugly that we don't call nolock join | |
3629 | * transaction for the free space inode case here. | |
3630 | * But it is safe because we only do the data space | |
3631 | * reservation for the free space cache in the | |
3632 | * transaction context, the common join transaction | |
3633 | * just increase the counter of the current transaction | |
3634 | * handler, doesn't try to acquire the trans_lock of | |
3635 | * the fs. | |
3636 | */ | |
7a7eaa40 | 3637 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3638 | if (IS_ERR(trans)) |
3639 | return PTR_ERR(trans); | |
9ed74f2d | 3640 | |
6a63209f | 3641 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3642 | alloc_target, |
3643 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3644 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3645 | if (ret < 0) { |
3646 | if (ret != -ENOSPC) | |
3647 | return ret; | |
3648 | else | |
3649 | goto commit_trans; | |
3650 | } | |
9ed74f2d | 3651 | |
b4d7c3c9 LZ |
3652 | if (!data_sinfo) |
3653 | data_sinfo = fs_info->data_sinfo; | |
3654 | ||
6a63209f JB |
3655 | goto again; |
3656 | } | |
f2bb8f5c JB |
3657 | |
3658 | /* | |
b150a4f1 JB |
3659 | * If we don't have enough pinned space to deal with this |
3660 | * allocation don't bother committing the transaction. | |
f2bb8f5c | 3661 | */ |
b150a4f1 JB |
3662 | if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, |
3663 | bytes) < 0) | |
f2bb8f5c | 3664 | committed = 1; |
6a63209f | 3665 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3666 | |
4e06bdd6 | 3667 | /* commit the current transaction and try again */ |
d52a5b5f | 3668 | commit_trans: |
a4abeea4 JB |
3669 | if (!committed && |
3670 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3671 | committed = 1; |
b150a4f1 | 3672 | |
7a7eaa40 | 3673 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3674 | if (IS_ERR(trans)) |
3675 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3676 | ret = btrfs_commit_transaction(trans, root); |
3677 | if (ret) | |
3678 | return ret; | |
3679 | goto again; | |
3680 | } | |
9ed74f2d | 3681 | |
cab45e22 JM |
3682 | trace_btrfs_space_reservation(root->fs_info, |
3683 | "space_info:enospc", | |
3684 | data_sinfo->flags, bytes, 1); | |
6a63209f JB |
3685 | return -ENOSPC; |
3686 | } | |
3687 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3688 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3689 | data_sinfo->flags, bytes, 1); |
6a63209f | 3690 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3691 | |
9ed74f2d | 3692 | return 0; |
9ed74f2d | 3693 | } |
6a63209f | 3694 | |
6a63209f | 3695 | /* |
fb25e914 | 3696 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3697 | */ |
0ca1f7ce | 3698 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3699 | { |
0ca1f7ce | 3700 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3701 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3702 | |
6a63209f | 3703 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3704 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3705 | |
b4d7c3c9 | 3706 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f | 3707 | spin_lock(&data_sinfo->lock); |
7ee9e440 | 3708 | WARN_ON(data_sinfo->bytes_may_use < bytes); |
6a63209f | 3709 | data_sinfo->bytes_may_use -= bytes; |
8c2a3ca2 | 3710 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3711 | data_sinfo->flags, bytes, 0); |
6a63209f | 3712 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3713 | } |
3714 | ||
97e728d4 | 3715 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3716 | { |
97e728d4 JB |
3717 | struct list_head *head = &info->space_info; |
3718 | struct btrfs_space_info *found; | |
e3ccfa98 | 3719 | |
97e728d4 JB |
3720 | rcu_read_lock(); |
3721 | list_for_each_entry_rcu(found, head, list) { | |
3722 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3723 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3724 | } |
97e728d4 | 3725 | rcu_read_unlock(); |
e3ccfa98 JB |
3726 | } |
3727 | ||
3c76cd84 MX |
3728 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
3729 | { | |
3730 | return (global->size << 1); | |
3731 | } | |
3732 | ||
e5bc2458 | 3733 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3734 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3735 | { |
fb25e914 | 3736 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3737 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3738 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3739 | u64 thresh; |
e3ccfa98 | 3740 | |
0e4f8f88 CM |
3741 | if (force == CHUNK_ALLOC_FORCE) |
3742 | return 1; | |
3743 | ||
fb25e914 JB |
3744 | /* |
3745 | * We need to take into account the global rsv because for all intents | |
3746 | * and purposes it's used space. Don't worry about locking the | |
3747 | * global_rsv, it doesn't change except when the transaction commits. | |
3748 | */ | |
54338b5c | 3749 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3c76cd84 | 3750 | num_allocated += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 3751 | |
0e4f8f88 CM |
3752 | /* |
3753 | * in limited mode, we want to have some free space up to | |
3754 | * about 1% of the FS size. | |
3755 | */ | |
3756 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3757 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3758 | thresh = max_t(u64, 64 * 1024 * 1024, |
3759 | div_factor_fine(thresh, 1)); | |
3760 | ||
3761 | if (num_bytes - num_allocated < thresh) | |
3762 | return 1; | |
3763 | } | |
0e4f8f88 | 3764 | |
698d0082 | 3765 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3766 | return 0; |
424499db | 3767 | return 1; |
32c00aff JB |
3768 | } |
3769 | ||
15d1ff81 LB |
3770 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3771 | { | |
3772 | u64 num_dev; | |
3773 | ||
53b381b3 DW |
3774 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3775 | BTRFS_BLOCK_GROUP_RAID0 | | |
3776 | BTRFS_BLOCK_GROUP_RAID5 | | |
3777 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3778 | num_dev = root->fs_info->fs_devices->rw_devices; |
3779 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3780 | num_dev = 2; | |
3781 | else | |
3782 | num_dev = 1; /* DUP or single */ | |
3783 | ||
3784 | /* metadata for updaing devices and chunk tree */ | |
3785 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3786 | } | |
3787 | ||
3788 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3789 | struct btrfs_root *root, u64 type) | |
3790 | { | |
3791 | struct btrfs_space_info *info; | |
3792 | u64 left; | |
3793 | u64 thresh; | |
3794 | ||
3795 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3796 | spin_lock(&info->lock); | |
3797 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3798 | info->bytes_reserved - info->bytes_readonly; | |
3799 | spin_unlock(&info->lock); | |
3800 | ||
3801 | thresh = get_system_chunk_thresh(root, type); | |
3802 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
c2cf52eb SK |
3803 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", |
3804 | left, thresh, type); | |
15d1ff81 LB |
3805 | dump_space_info(info, 0, 0); |
3806 | } | |
3807 | ||
3808 | if (left < thresh) { | |
3809 | u64 flags; | |
3810 | ||
3811 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3812 | btrfs_alloc_chunk(trans, root, flags); | |
3813 | } | |
3814 | } | |
3815 | ||
6324fbf3 | 3816 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3817 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3818 | { |
6324fbf3 | 3819 | struct btrfs_space_info *space_info; |
97e728d4 | 3820 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3821 | int wait_for_alloc = 0; |
9ed74f2d | 3822 | int ret = 0; |
9ed74f2d | 3823 | |
c6b305a8 JB |
3824 | /* Don't re-enter if we're already allocating a chunk */ |
3825 | if (trans->allocating_chunk) | |
3826 | return -ENOSPC; | |
3827 | ||
6324fbf3 | 3828 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3829 | if (!space_info) { |
3830 | ret = update_space_info(extent_root->fs_info, flags, | |
3831 | 0, 0, &space_info); | |
79787eaa | 3832 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3833 | } |
79787eaa | 3834 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3835 | |
6d74119f | 3836 | again: |
25179201 | 3837 | spin_lock(&space_info->lock); |
9e622d6b | 3838 | if (force < space_info->force_alloc) |
0e4f8f88 | 3839 | force = space_info->force_alloc; |
25179201 | 3840 | if (space_info->full) { |
09fb99a6 FDBM |
3841 | if (should_alloc_chunk(extent_root, space_info, force)) |
3842 | ret = -ENOSPC; | |
3843 | else | |
3844 | ret = 0; | |
25179201 | 3845 | spin_unlock(&space_info->lock); |
09fb99a6 | 3846 | return ret; |
9ed74f2d JB |
3847 | } |
3848 | ||
698d0082 | 3849 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3850 | spin_unlock(&space_info->lock); |
6d74119f JB |
3851 | return 0; |
3852 | } else if (space_info->chunk_alloc) { | |
3853 | wait_for_alloc = 1; | |
3854 | } else { | |
3855 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3856 | } |
0e4f8f88 | 3857 | |
25179201 | 3858 | spin_unlock(&space_info->lock); |
9ed74f2d | 3859 | |
6d74119f JB |
3860 | mutex_lock(&fs_info->chunk_mutex); |
3861 | ||
3862 | /* | |
3863 | * The chunk_mutex is held throughout the entirety of a chunk | |
3864 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3865 | * other guy is done and we need to recheck and see if we should | |
3866 | * allocate. | |
3867 | */ | |
3868 | if (wait_for_alloc) { | |
3869 | mutex_unlock(&fs_info->chunk_mutex); | |
3870 | wait_for_alloc = 0; | |
3871 | goto again; | |
3872 | } | |
3873 | ||
c6b305a8 JB |
3874 | trans->allocating_chunk = true; |
3875 | ||
67377734 JB |
3876 | /* |
3877 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3878 | * allocating mixed chunks instead of individual chunks. | |
3879 | */ | |
3880 | if (btrfs_mixed_space_info(space_info)) | |
3881 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3882 | ||
97e728d4 JB |
3883 | /* |
3884 | * if we're doing a data chunk, go ahead and make sure that | |
3885 | * we keep a reasonable number of metadata chunks allocated in the | |
3886 | * FS as well. | |
3887 | */ | |
9ed74f2d | 3888 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3889 | fs_info->data_chunk_allocations++; |
3890 | if (!(fs_info->data_chunk_allocations % | |
3891 | fs_info->metadata_ratio)) | |
3892 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3893 | } |
3894 | ||
15d1ff81 LB |
3895 | /* |
3896 | * Check if we have enough space in SYSTEM chunk because we may need | |
3897 | * to update devices. | |
3898 | */ | |
3899 | check_system_chunk(trans, extent_root, flags); | |
3900 | ||
2b82032c | 3901 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3902 | trans->allocating_chunk = false; |
92b8e897 | 3903 | |
9ed74f2d | 3904 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3905 | if (ret < 0 && ret != -ENOSPC) |
3906 | goto out; | |
9ed74f2d | 3907 | if (ret) |
6324fbf3 | 3908 | space_info->full = 1; |
424499db YZ |
3909 | else |
3910 | ret = 1; | |
6d74119f | 3911 | |
0e4f8f88 | 3912 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3913 | out: |
6d74119f | 3914 | space_info->chunk_alloc = 0; |
9ed74f2d | 3915 | spin_unlock(&space_info->lock); |
a25c75d5 | 3916 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3917 | return ret; |
6324fbf3 | 3918 | } |
9ed74f2d | 3919 | |
a80c8dcf JB |
3920 | static int can_overcommit(struct btrfs_root *root, |
3921 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3922 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3923 | { |
96f1bb57 | 3924 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3925 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3c76cd84 | 3926 | u64 space_size; |
a80c8dcf JB |
3927 | u64 avail; |
3928 | u64 used; | |
3929 | ||
3930 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3931 | space_info->bytes_pinned + space_info->bytes_readonly; |
3932 | ||
96f1bb57 JB |
3933 | /* |
3934 | * We only want to allow over committing if we have lots of actual space | |
3935 | * free, but if we don't have enough space to handle the global reserve | |
3936 | * space then we could end up having a real enospc problem when trying | |
3937 | * to allocate a chunk or some other such important allocation. | |
3938 | */ | |
3c76cd84 MX |
3939 | spin_lock(&global_rsv->lock); |
3940 | space_size = calc_global_rsv_need_space(global_rsv); | |
3941 | spin_unlock(&global_rsv->lock); | |
3942 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
3943 | return 0; |
3944 | ||
3945 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3946 | |
3947 | spin_lock(&root->fs_info->free_chunk_lock); | |
3948 | avail = root->fs_info->free_chunk_space; | |
3949 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3950 | ||
3951 | /* | |
3952 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
3953 | * space is actually useable. For raid56, the space info used |
3954 | * doesn't include the parity drive, so we don't have to | |
3955 | * change the math | |
a80c8dcf JB |
3956 | */ |
3957 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3958 | BTRFS_BLOCK_GROUP_RAID1 | | |
3959 | BTRFS_BLOCK_GROUP_RAID10)) | |
3960 | avail >>= 1; | |
3961 | ||
3962 | /* | |
561c294d MX |
3963 | * If we aren't flushing all things, let us overcommit up to |
3964 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3965 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3966 | */ |
08e007d2 | 3967 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
14575aef | 3968 | avail >>= 3; |
a80c8dcf | 3969 | else |
14575aef | 3970 | avail >>= 1; |
a80c8dcf | 3971 | |
14575aef | 3972 | if (used + bytes < space_info->total_bytes + avail) |
a80c8dcf JB |
3973 | return 1; |
3974 | return 0; | |
3975 | } | |
3976 | ||
48a3b636 | 3977 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
6c255e67 | 3978 | unsigned long nr_pages, int nr_items) |
da633a42 MX |
3979 | { |
3980 | struct super_block *sb = root->fs_info->sb; | |
da633a42 | 3981 | |
925a6efb JB |
3982 | if (down_read_trylock(&sb->s_umount)) { |
3983 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
3984 | up_read(&sb->s_umount); | |
3985 | } else { | |
da633a42 MX |
3986 | /* |
3987 | * We needn't worry the filesystem going from r/w to r/o though | |
3988 | * we don't acquire ->s_umount mutex, because the filesystem | |
3989 | * should guarantee the delalloc inodes list be empty after | |
3990 | * the filesystem is readonly(all dirty pages are written to | |
3991 | * the disk). | |
3992 | */ | |
6c255e67 | 3993 | btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); |
98ad69cf | 3994 | if (!current->journal_info) |
6c255e67 | 3995 | btrfs_wait_ordered_roots(root->fs_info, nr_items); |
da633a42 MX |
3996 | } |
3997 | } | |
3998 | ||
18cd8ea6 MX |
3999 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) |
4000 | { | |
4001 | u64 bytes; | |
4002 | int nr; | |
4003 | ||
4004 | bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4005 | nr = (int)div64_u64(to_reclaim, bytes); | |
4006 | if (!nr) | |
4007 | nr = 1; | |
4008 | return nr; | |
4009 | } | |
4010 | ||
c61a16a7 MX |
4011 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) |
4012 | ||
9ed74f2d | 4013 | /* |
5da9d01b | 4014 | * shrink metadata reservation for delalloc |
9ed74f2d | 4015 | */ |
f4c738c2 JB |
4016 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
4017 | bool wait_ordered) | |
5da9d01b | 4018 | { |
0ca1f7ce | 4019 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 4020 | struct btrfs_space_info *space_info; |
663350ac | 4021 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4022 | u64 delalloc_bytes; |
5da9d01b | 4023 | u64 max_reclaim; |
b1953bce | 4024 | long time_left; |
d3ee29e3 MX |
4025 | unsigned long nr_pages; |
4026 | int loops; | |
b0244199 | 4027 | int items; |
08e007d2 | 4028 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 4029 | |
c61a16a7 | 4030 | /* Calc the number of the pages we need flush for space reservation */ |
b0244199 MX |
4031 | items = calc_reclaim_items_nr(root, to_reclaim); |
4032 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; | |
c61a16a7 | 4033 | |
663350ac | 4034 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 4035 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 4036 | space_info = block_rsv->space_info; |
bf9022e0 | 4037 | |
963d678b MX |
4038 | delalloc_bytes = percpu_counter_sum_positive( |
4039 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 4040 | if (delalloc_bytes == 0) { |
fdb5effd | 4041 | if (trans) |
f4c738c2 | 4042 | return; |
38c135af | 4043 | if (wait_ordered) |
b0244199 | 4044 | btrfs_wait_ordered_roots(root->fs_info, items); |
f4c738c2 | 4045 | return; |
fdb5effd JB |
4046 | } |
4047 | ||
d3ee29e3 | 4048 | loops = 0; |
f4c738c2 JB |
4049 | while (delalloc_bytes && loops < 3) { |
4050 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
4051 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
6c255e67 | 4052 | btrfs_writeback_inodes_sb_nr(root, nr_pages, items); |
dea31f52 JB |
4053 | /* |
4054 | * We need to wait for the async pages to actually start before | |
4055 | * we do anything. | |
4056 | */ | |
9f3a074d MX |
4057 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); |
4058 | if (!max_reclaim) | |
4059 | goto skip_async; | |
4060 | ||
4061 | if (max_reclaim <= nr_pages) | |
4062 | max_reclaim = 0; | |
4063 | else | |
4064 | max_reclaim -= nr_pages; | |
dea31f52 | 4065 | |
9f3a074d MX |
4066 | wait_event(root->fs_info->async_submit_wait, |
4067 | atomic_read(&root->fs_info->async_delalloc_pages) <= | |
4068 | (int)max_reclaim); | |
4069 | skip_async: | |
08e007d2 MX |
4070 | if (!trans) |
4071 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4072 | else | |
4073 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 4074 | spin_lock(&space_info->lock); |
08e007d2 | 4075 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
4076 | spin_unlock(&space_info->lock); |
4077 | break; | |
4078 | } | |
0019f10d | 4079 | spin_unlock(&space_info->lock); |
5da9d01b | 4080 | |
36e39c40 | 4081 | loops++; |
f104d044 | 4082 | if (wait_ordered && !trans) { |
b0244199 | 4083 | btrfs_wait_ordered_roots(root->fs_info, items); |
f104d044 | 4084 | } else { |
f4c738c2 | 4085 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4086 | if (time_left) |
4087 | break; | |
4088 | } | |
963d678b MX |
4089 | delalloc_bytes = percpu_counter_sum_positive( |
4090 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 4091 | } |
5da9d01b YZ |
4092 | } |
4093 | ||
663350ac JB |
4094 | /** |
4095 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4096 | * @root - the root we're allocating for | |
4097 | * @bytes - the number of bytes we want to reserve | |
4098 | * @force - force the commit | |
8bb8ab2e | 4099 | * |
663350ac JB |
4100 | * This will check to make sure that committing the transaction will actually |
4101 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4102 | * will return -ENOSPC. | |
8bb8ab2e | 4103 | */ |
663350ac JB |
4104 | static int may_commit_transaction(struct btrfs_root *root, |
4105 | struct btrfs_space_info *space_info, | |
4106 | u64 bytes, int force) | |
4107 | { | |
4108 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4109 | struct btrfs_trans_handle *trans; | |
4110 | ||
4111 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4112 | if (trans) | |
4113 | return -EAGAIN; | |
4114 | ||
4115 | if (force) | |
4116 | goto commit; | |
4117 | ||
4118 | /* See if there is enough pinned space to make this reservation */ | |
b150a4f1 | 4119 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
0424c548 | 4120 | bytes) >= 0) |
663350ac | 4121 | goto commit; |
663350ac JB |
4122 | |
4123 | /* | |
4124 | * See if there is some space in the delayed insertion reservation for | |
4125 | * this reservation. | |
4126 | */ | |
4127 | if (space_info != delayed_rsv->space_info) | |
4128 | return -ENOSPC; | |
4129 | ||
4130 | spin_lock(&delayed_rsv->lock); | |
b150a4f1 JB |
4131 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
4132 | bytes - delayed_rsv->size) >= 0) { | |
663350ac JB |
4133 | spin_unlock(&delayed_rsv->lock); |
4134 | return -ENOSPC; | |
4135 | } | |
4136 | spin_unlock(&delayed_rsv->lock); | |
4137 | ||
4138 | commit: | |
4139 | trans = btrfs_join_transaction(root); | |
4140 | if (IS_ERR(trans)) | |
4141 | return -ENOSPC; | |
4142 | ||
4143 | return btrfs_commit_transaction(trans, root); | |
4144 | } | |
4145 | ||
96c3f433 | 4146 | enum flush_state { |
67b0fd63 JB |
4147 | FLUSH_DELAYED_ITEMS_NR = 1, |
4148 | FLUSH_DELAYED_ITEMS = 2, | |
4149 | FLUSH_DELALLOC = 3, | |
4150 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
4151 | ALLOC_CHUNK = 5, |
4152 | COMMIT_TRANS = 6, | |
96c3f433 JB |
4153 | }; |
4154 | ||
4155 | static int flush_space(struct btrfs_root *root, | |
4156 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4157 | u64 orig_bytes, int state) | |
4158 | { | |
4159 | struct btrfs_trans_handle *trans; | |
4160 | int nr; | |
f4c738c2 | 4161 | int ret = 0; |
96c3f433 JB |
4162 | |
4163 | switch (state) { | |
96c3f433 JB |
4164 | case FLUSH_DELAYED_ITEMS_NR: |
4165 | case FLUSH_DELAYED_ITEMS: | |
18cd8ea6 MX |
4166 | if (state == FLUSH_DELAYED_ITEMS_NR) |
4167 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; | |
4168 | else | |
96c3f433 | 4169 | nr = -1; |
18cd8ea6 | 4170 | |
96c3f433 JB |
4171 | trans = btrfs_join_transaction(root); |
4172 | if (IS_ERR(trans)) { | |
4173 | ret = PTR_ERR(trans); | |
4174 | break; | |
4175 | } | |
4176 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4177 | btrfs_end_transaction(trans, root); | |
4178 | break; | |
67b0fd63 JB |
4179 | case FLUSH_DELALLOC: |
4180 | case FLUSH_DELALLOC_WAIT: | |
24af7dd1 | 4181 | shrink_delalloc(root, num_bytes * 2, orig_bytes, |
67b0fd63 JB |
4182 | state == FLUSH_DELALLOC_WAIT); |
4183 | break; | |
ea658bad JB |
4184 | case ALLOC_CHUNK: |
4185 | trans = btrfs_join_transaction(root); | |
4186 | if (IS_ERR(trans)) { | |
4187 | ret = PTR_ERR(trans); | |
4188 | break; | |
4189 | } | |
4190 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4191 | btrfs_get_alloc_profile(root, 0), |
4192 | CHUNK_ALLOC_NO_FORCE); | |
4193 | btrfs_end_transaction(trans, root); | |
4194 | if (ret == -ENOSPC) | |
4195 | ret = 0; | |
4196 | break; | |
96c3f433 JB |
4197 | case COMMIT_TRANS: |
4198 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4199 | break; | |
4200 | default: | |
4201 | ret = -ENOSPC; | |
4202 | break; | |
4203 | } | |
4204 | ||
4205 | return ret; | |
4206 | } | |
4a92b1b8 JB |
4207 | /** |
4208 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4209 | * @root - the root we're allocating for | |
4210 | * @block_rsv - the block_rsv we're allocating for | |
4211 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4212 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4213 | * |
4a92b1b8 JB |
4214 | * This will reserve orgi_bytes number of bytes from the space info associated |
4215 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4216 | * flush out space to make room. It will do this by flushing delalloc if | |
4217 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4218 | * regain reservations will be made and this will fail if there is not enough | |
4219 | * space already. | |
8bb8ab2e | 4220 | */ |
4a92b1b8 | 4221 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4222 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4223 | u64 orig_bytes, |
4224 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4225 | { |
f0486c68 | 4226 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4227 | u64 used; |
8bb8ab2e | 4228 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4229 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4230 | int ret = 0; |
fdb5effd | 4231 | bool flushing = false; |
9ed74f2d | 4232 | |
8bb8ab2e | 4233 | again: |
fdb5effd | 4234 | ret = 0; |
8bb8ab2e | 4235 | spin_lock(&space_info->lock); |
fdb5effd | 4236 | /* |
08e007d2 MX |
4237 | * We only want to wait if somebody other than us is flushing and we |
4238 | * are actually allowed to flush all things. | |
fdb5effd | 4239 | */ |
08e007d2 MX |
4240 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4241 | space_info->flush) { | |
fdb5effd JB |
4242 | spin_unlock(&space_info->lock); |
4243 | /* | |
4244 | * If we have a trans handle we can't wait because the flusher | |
4245 | * may have to commit the transaction, which would mean we would | |
4246 | * deadlock since we are waiting for the flusher to finish, but | |
4247 | * hold the current transaction open. | |
4248 | */ | |
663350ac | 4249 | if (current->journal_info) |
fdb5effd | 4250 | return -EAGAIN; |
b9688bb8 AJ |
4251 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4252 | /* Must have been killed, return */ | |
4253 | if (ret) | |
fdb5effd JB |
4254 | return -EINTR; |
4255 | ||
4256 | spin_lock(&space_info->lock); | |
4257 | } | |
4258 | ||
4259 | ret = -ENOSPC; | |
2bf64758 JB |
4260 | used = space_info->bytes_used + space_info->bytes_reserved + |
4261 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4262 | space_info->bytes_may_use; | |
9ed74f2d | 4263 | |
8bb8ab2e JB |
4264 | /* |
4265 | * The idea here is that we've not already over-reserved the block group | |
4266 | * then we can go ahead and save our reservation first and then start | |
4267 | * flushing if we need to. Otherwise if we've already overcommitted | |
4268 | * lets start flushing stuff first and then come back and try to make | |
4269 | * our reservation. | |
4270 | */ | |
2bf64758 JB |
4271 | if (used <= space_info->total_bytes) { |
4272 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4273 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4274 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4275 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4276 | ret = 0; |
4277 | } else { | |
4278 | /* | |
4279 | * Ok set num_bytes to orig_bytes since we aren't | |
4280 | * overocmmitted, this way we only try and reclaim what | |
4281 | * we need. | |
4282 | */ | |
4283 | num_bytes = orig_bytes; | |
4284 | } | |
4285 | } else { | |
4286 | /* | |
4287 | * Ok we're over committed, set num_bytes to the overcommitted | |
4288 | * amount plus the amount of bytes that we need for this | |
4289 | * reservation. | |
4290 | */ | |
2bf64758 | 4291 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4292 | (orig_bytes * 2); |
8bb8ab2e | 4293 | } |
9ed74f2d | 4294 | |
44734ed1 JB |
4295 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4296 | space_info->bytes_may_use += orig_bytes; | |
4297 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4298 | space_info->flags, orig_bytes, | |
4299 | 1); | |
4300 | ret = 0; | |
2bf64758 JB |
4301 | } |
4302 | ||
8bb8ab2e JB |
4303 | /* |
4304 | * Couldn't make our reservation, save our place so while we're trying | |
4305 | * to reclaim space we can actually use it instead of somebody else | |
4306 | * stealing it from us. | |
08e007d2 MX |
4307 | * |
4308 | * We make the other tasks wait for the flush only when we can flush | |
4309 | * all things. | |
8bb8ab2e | 4310 | */ |
72bcd99d | 4311 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4312 | flushing = true; |
4313 | space_info->flush = 1; | |
8bb8ab2e | 4314 | } |
9ed74f2d | 4315 | |
f0486c68 | 4316 | spin_unlock(&space_info->lock); |
9ed74f2d | 4317 | |
08e007d2 | 4318 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4319 | goto out; |
f0486c68 | 4320 | |
96c3f433 JB |
4321 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4322 | flush_state); | |
4323 | flush_state++; | |
08e007d2 MX |
4324 | |
4325 | /* | |
4326 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4327 | * would happen. So skip delalloc flush. | |
4328 | */ | |
4329 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4330 | (flush_state == FLUSH_DELALLOC || | |
4331 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4332 | flush_state = ALLOC_CHUNK; | |
4333 | ||
96c3f433 | 4334 | if (!ret) |
8bb8ab2e | 4335 | goto again; |
08e007d2 MX |
4336 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4337 | flush_state < COMMIT_TRANS) | |
4338 | goto again; | |
4339 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4340 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4341 | goto again; |
4342 | ||
4343 | out: | |
5d80366e JB |
4344 | if (ret == -ENOSPC && |
4345 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4346 | struct btrfs_block_rsv *global_rsv = | |
4347 | &root->fs_info->global_block_rsv; | |
4348 | ||
4349 | if (block_rsv != global_rsv && | |
4350 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4351 | ret = 0; | |
4352 | } | |
cab45e22 JM |
4353 | if (ret == -ENOSPC) |
4354 | trace_btrfs_space_reservation(root->fs_info, | |
4355 | "space_info:enospc", | |
4356 | space_info->flags, orig_bytes, 1); | |
fdb5effd | 4357 | if (flushing) { |
8bb8ab2e | 4358 | spin_lock(&space_info->lock); |
fdb5effd JB |
4359 | space_info->flush = 0; |
4360 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4361 | spin_unlock(&space_info->lock); |
f0486c68 | 4362 | } |
f0486c68 YZ |
4363 | return ret; |
4364 | } | |
4365 | ||
79787eaa JM |
4366 | static struct btrfs_block_rsv *get_block_rsv( |
4367 | const struct btrfs_trans_handle *trans, | |
4368 | const struct btrfs_root *root) | |
f0486c68 | 4369 | { |
4c13d758 JB |
4370 | struct btrfs_block_rsv *block_rsv = NULL; |
4371 | ||
0e721106 JB |
4372 | if (root->ref_cows) |
4373 | block_rsv = trans->block_rsv; | |
4374 | ||
4375 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4376 | block_rsv = trans->block_rsv; |
4c13d758 | 4377 | |
f7a81ea4 SB |
4378 | if (root == root->fs_info->uuid_root) |
4379 | block_rsv = trans->block_rsv; | |
4380 | ||
4c13d758 | 4381 | if (!block_rsv) |
f0486c68 YZ |
4382 | block_rsv = root->block_rsv; |
4383 | ||
4384 | if (!block_rsv) | |
4385 | block_rsv = &root->fs_info->empty_block_rsv; | |
4386 | ||
4387 | return block_rsv; | |
4388 | } | |
4389 | ||
4390 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4391 | u64 num_bytes) | |
4392 | { | |
4393 | int ret = -ENOSPC; | |
4394 | spin_lock(&block_rsv->lock); | |
4395 | if (block_rsv->reserved >= num_bytes) { | |
4396 | block_rsv->reserved -= num_bytes; | |
4397 | if (block_rsv->reserved < block_rsv->size) | |
4398 | block_rsv->full = 0; | |
4399 | ret = 0; | |
4400 | } | |
4401 | spin_unlock(&block_rsv->lock); | |
4402 | return ret; | |
4403 | } | |
4404 | ||
4405 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4406 | u64 num_bytes, int update_size) | |
4407 | { | |
4408 | spin_lock(&block_rsv->lock); | |
4409 | block_rsv->reserved += num_bytes; | |
4410 | if (update_size) | |
4411 | block_rsv->size += num_bytes; | |
4412 | else if (block_rsv->reserved >= block_rsv->size) | |
4413 | block_rsv->full = 1; | |
4414 | spin_unlock(&block_rsv->lock); | |
4415 | } | |
4416 | ||
d52be818 JB |
4417 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
4418 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4419 | int min_factor) | |
4420 | { | |
4421 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4422 | u64 min_bytes; | |
4423 | ||
4424 | if (global_rsv->space_info != dest->space_info) | |
4425 | return -ENOSPC; | |
4426 | ||
4427 | spin_lock(&global_rsv->lock); | |
4428 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4429 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4430 | spin_unlock(&global_rsv->lock); | |
4431 | return -ENOSPC; | |
4432 | } | |
4433 | global_rsv->reserved -= num_bytes; | |
4434 | if (global_rsv->reserved < global_rsv->size) | |
4435 | global_rsv->full = 0; | |
4436 | spin_unlock(&global_rsv->lock); | |
4437 | ||
4438 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4439 | return 0; | |
4440 | } | |
4441 | ||
8c2a3ca2 JB |
4442 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4443 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4444 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4445 | { |
4446 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4447 | ||
4448 | spin_lock(&block_rsv->lock); | |
4449 | if (num_bytes == (u64)-1) | |
4450 | num_bytes = block_rsv->size; | |
4451 | block_rsv->size -= num_bytes; | |
4452 | if (block_rsv->reserved >= block_rsv->size) { | |
4453 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4454 | block_rsv->reserved = block_rsv->size; | |
4455 | block_rsv->full = 1; | |
4456 | } else { | |
4457 | num_bytes = 0; | |
4458 | } | |
4459 | spin_unlock(&block_rsv->lock); | |
4460 | ||
4461 | if (num_bytes > 0) { | |
4462 | if (dest) { | |
e9e22899 JB |
4463 | spin_lock(&dest->lock); |
4464 | if (!dest->full) { | |
4465 | u64 bytes_to_add; | |
4466 | ||
4467 | bytes_to_add = dest->size - dest->reserved; | |
4468 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4469 | dest->reserved += bytes_to_add; | |
4470 | if (dest->reserved >= dest->size) | |
4471 | dest->full = 1; | |
4472 | num_bytes -= bytes_to_add; | |
4473 | } | |
4474 | spin_unlock(&dest->lock); | |
4475 | } | |
4476 | if (num_bytes) { | |
f0486c68 | 4477 | spin_lock(&space_info->lock); |
fb25e914 | 4478 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4479 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4480 | space_info->flags, num_bytes, 0); |
f0486c68 | 4481 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4482 | } |
9ed74f2d | 4483 | } |
f0486c68 | 4484 | } |
4e06bdd6 | 4485 | |
f0486c68 YZ |
4486 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4487 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4488 | { | |
4489 | int ret; | |
9ed74f2d | 4490 | |
f0486c68 YZ |
4491 | ret = block_rsv_use_bytes(src, num_bytes); |
4492 | if (ret) | |
4493 | return ret; | |
9ed74f2d | 4494 | |
f0486c68 | 4495 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4496 | return 0; |
4497 | } | |
4498 | ||
66d8f3dd | 4499 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4500 | { |
f0486c68 YZ |
4501 | memset(rsv, 0, sizeof(*rsv)); |
4502 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4503 | rsv->type = type; |
f0486c68 YZ |
4504 | } |
4505 | ||
66d8f3dd MX |
4506 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4507 | unsigned short type) | |
f0486c68 YZ |
4508 | { |
4509 | struct btrfs_block_rsv *block_rsv; | |
4510 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4511 | |
f0486c68 YZ |
4512 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4513 | if (!block_rsv) | |
4514 | return NULL; | |
9ed74f2d | 4515 | |
66d8f3dd | 4516 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4517 | block_rsv->space_info = __find_space_info(fs_info, |
4518 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4519 | return block_rsv; |
4520 | } | |
9ed74f2d | 4521 | |
f0486c68 YZ |
4522 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4523 | struct btrfs_block_rsv *rsv) | |
4524 | { | |
2aaa6655 JB |
4525 | if (!rsv) |
4526 | return; | |
dabdb640 JB |
4527 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4528 | kfree(rsv); | |
9ed74f2d JB |
4529 | } |
4530 | ||
08e007d2 MX |
4531 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4532 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4533 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4534 | { |
f0486c68 | 4535 | int ret; |
9ed74f2d | 4536 | |
f0486c68 YZ |
4537 | if (num_bytes == 0) |
4538 | return 0; | |
8bb8ab2e | 4539 | |
61b520a9 | 4540 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4541 | if (!ret) { |
4542 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4543 | return 0; | |
4544 | } | |
9ed74f2d | 4545 | |
f0486c68 | 4546 | return ret; |
f0486c68 | 4547 | } |
9ed74f2d | 4548 | |
4a92b1b8 | 4549 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4550 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4551 | { |
4552 | u64 num_bytes = 0; | |
f0486c68 | 4553 | int ret = -ENOSPC; |
9ed74f2d | 4554 | |
f0486c68 YZ |
4555 | if (!block_rsv) |
4556 | return 0; | |
9ed74f2d | 4557 | |
f0486c68 | 4558 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4559 | num_bytes = div_factor(block_rsv->size, min_factor); |
4560 | if (block_rsv->reserved >= num_bytes) | |
4561 | ret = 0; | |
4562 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4563 | |
36ba022a JB |
4564 | return ret; |
4565 | } | |
4566 | ||
08e007d2 MX |
4567 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4568 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4569 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4570 | { |
4571 | u64 num_bytes = 0; | |
4572 | int ret = -ENOSPC; | |
4573 | ||
4574 | if (!block_rsv) | |
4575 | return 0; | |
4576 | ||
4577 | spin_lock(&block_rsv->lock); | |
4578 | num_bytes = min_reserved; | |
13553e52 | 4579 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4580 | ret = 0; |
13553e52 | 4581 | else |
f0486c68 | 4582 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4583 | spin_unlock(&block_rsv->lock); |
13553e52 | 4584 | |
f0486c68 YZ |
4585 | if (!ret) |
4586 | return 0; | |
4587 | ||
aa38a711 | 4588 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4589 | if (!ret) { |
4590 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4591 | return 0; |
6a63209f | 4592 | } |
9ed74f2d | 4593 | |
13553e52 | 4594 | return ret; |
f0486c68 YZ |
4595 | } |
4596 | ||
4597 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4598 | struct btrfs_block_rsv *dst_rsv, | |
4599 | u64 num_bytes) | |
4600 | { | |
4601 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4602 | } | |
4603 | ||
4604 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4605 | struct btrfs_block_rsv *block_rsv, | |
4606 | u64 num_bytes) | |
4607 | { | |
4608 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
17504584 | 4609 | if (global_rsv == block_rsv || |
f0486c68 YZ |
4610 | block_rsv->space_info != global_rsv->space_info) |
4611 | global_rsv = NULL; | |
8c2a3ca2 JB |
4612 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4613 | num_bytes); | |
6a63209f JB |
4614 | } |
4615 | ||
4616 | /* | |
8929ecfa YZ |
4617 | * helper to calculate size of global block reservation. |
4618 | * the desired value is sum of space used by extent tree, | |
4619 | * checksum tree and root tree | |
6a63209f | 4620 | */ |
8929ecfa | 4621 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4622 | { |
8929ecfa YZ |
4623 | struct btrfs_space_info *sinfo; |
4624 | u64 num_bytes; | |
4625 | u64 meta_used; | |
4626 | u64 data_used; | |
6c41761f | 4627 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4628 | |
8929ecfa YZ |
4629 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4630 | spin_lock(&sinfo->lock); | |
4631 | data_used = sinfo->bytes_used; | |
4632 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4633 | |
8929ecfa YZ |
4634 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4635 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4636 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4637 | data_used = 0; | |
8929ecfa YZ |
4638 | meta_used = sinfo->bytes_used; |
4639 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4640 | |
8929ecfa YZ |
4641 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4642 | csum_size * 2; | |
4643 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4644 | |
8929ecfa | 4645 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4646 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4647 | |
8929ecfa YZ |
4648 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4649 | } | |
6a63209f | 4650 | |
8929ecfa YZ |
4651 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4652 | { | |
4653 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4654 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4655 | u64 num_bytes; | |
6a63209f | 4656 | |
8929ecfa | 4657 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4658 | |
8929ecfa | 4659 | spin_lock(&sinfo->lock); |
1f699d38 | 4660 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4661 | |
fdf30d1c | 4662 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4663 | |
8929ecfa | 4664 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4665 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4666 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4667 | |
4668 | if (sinfo->total_bytes > num_bytes) { | |
4669 | num_bytes = sinfo->total_bytes - num_bytes; | |
4670 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4671 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4672 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4673 | sinfo->flags, num_bytes, 1); |
6a63209f | 4674 | } |
6a63209f | 4675 | |
8929ecfa YZ |
4676 | if (block_rsv->reserved >= block_rsv->size) { |
4677 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4678 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4679 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4680 | sinfo->flags, num_bytes, 0); |
8929ecfa YZ |
4681 | block_rsv->reserved = block_rsv->size; |
4682 | block_rsv->full = 1; | |
4683 | } | |
182608c8 | 4684 | |
8929ecfa | 4685 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4686 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4687 | } |
4688 | ||
f0486c68 | 4689 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4690 | { |
f0486c68 | 4691 | struct btrfs_space_info *space_info; |
6a63209f | 4692 | |
f0486c68 YZ |
4693 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4694 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4695 | |
f0486c68 | 4696 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4697 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4698 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4699 | fs_info->trans_block_rsv.space_info = space_info; |
4700 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4701 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4702 | |
8929ecfa YZ |
4703 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4704 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4705 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4706 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
4707 | if (fs_info->quota_root) |
4708 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4709 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4710 | |
8929ecfa | 4711 | update_global_block_rsv(fs_info); |
6a63209f JB |
4712 | } |
4713 | ||
8929ecfa | 4714 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4715 | { |
8c2a3ca2 JB |
4716 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4717 | (u64)-1); | |
8929ecfa YZ |
4718 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4719 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4720 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4721 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4722 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4723 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4724 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4725 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4726 | } |
4727 | ||
a22285a6 YZ |
4728 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4729 | struct btrfs_root *root) | |
6a63209f | 4730 | { |
0e721106 JB |
4731 | if (!trans->block_rsv) |
4732 | return; | |
4733 | ||
a22285a6 YZ |
4734 | if (!trans->bytes_reserved) |
4735 | return; | |
6a63209f | 4736 | |
e77266e4 | 4737 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4738 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4739 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4740 | trans->bytes_reserved = 0; |
4741 | } | |
6a63209f | 4742 | |
79787eaa | 4743 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4744 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4745 | struct inode *inode) | |
4746 | { | |
4747 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4748 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4749 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4750 | ||
4751 | /* | |
fcb80c2a JB |
4752 | * We need to hold space in order to delete our orphan item once we've |
4753 | * added it, so this takes the reservation so we can release it later | |
4754 | * when we are truly done with the orphan item. | |
d68fc57b | 4755 | */ |
ff5714cc | 4756 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4757 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4758 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4759 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4760 | } |
4761 | ||
d68fc57b | 4762 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4763 | { |
d68fc57b | 4764 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4765 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4766 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4767 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4768 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4769 | } | |
97e728d4 | 4770 | |
d5c12070 MX |
4771 | /* |
4772 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4773 | * root: the root of the parent directory | |
4774 | * rsv: block reservation | |
4775 | * items: the number of items that we need do reservation | |
4776 | * qgroup_reserved: used to return the reserved size in qgroup | |
4777 | * | |
4778 | * This function is used to reserve the space for snapshot/subvolume | |
4779 | * creation and deletion. Those operations are different with the | |
4780 | * common file/directory operations, they change two fs/file trees | |
4781 | * and root tree, the number of items that the qgroup reserves is | |
4782 | * different with the free space reservation. So we can not use | |
4783 | * the space reseravtion mechanism in start_transaction(). | |
4784 | */ | |
4785 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4786 | struct btrfs_block_rsv *rsv, | |
4787 | int items, | |
ee3441b4 JM |
4788 | u64 *qgroup_reserved, |
4789 | bool use_global_rsv) | |
a22285a6 | 4790 | { |
d5c12070 MX |
4791 | u64 num_bytes; |
4792 | int ret; | |
ee3441b4 | 4793 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
d5c12070 MX |
4794 | |
4795 | if (root->fs_info->quota_enabled) { | |
4796 | /* One for parent inode, two for dir entries */ | |
4797 | num_bytes = 3 * root->leafsize; | |
4798 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4799 | if (ret) | |
4800 | return ret; | |
4801 | } else { | |
4802 | num_bytes = 0; | |
4803 | } | |
4804 | ||
4805 | *qgroup_reserved = num_bytes; | |
4806 | ||
4807 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4808 | rsv->space_info = __find_space_info(root->fs_info, | |
4809 | BTRFS_BLOCK_GROUP_METADATA); | |
4810 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4811 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
4812 | |
4813 | if (ret == -ENOSPC && use_global_rsv) | |
4814 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); | |
4815 | ||
d5c12070 MX |
4816 | if (ret) { |
4817 | if (*qgroup_reserved) | |
4818 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4819 | } | |
4820 | ||
4821 | return ret; | |
4822 | } | |
4823 | ||
4824 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4825 | struct btrfs_block_rsv *rsv, | |
4826 | u64 qgroup_reserved) | |
4827 | { | |
4828 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4829 | if (qgroup_reserved) | |
4830 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4831 | } |
4832 | ||
7709cde3 JB |
4833 | /** |
4834 | * drop_outstanding_extent - drop an outstanding extent | |
4835 | * @inode: the inode we're dropping the extent for | |
4836 | * | |
4837 | * This is called when we are freeing up an outstanding extent, either called | |
4838 | * after an error or after an extent is written. This will return the number of | |
4839 | * reserved extents that need to be freed. This must be called with | |
4840 | * BTRFS_I(inode)->lock held. | |
4841 | */ | |
9e0baf60 JB |
4842 | static unsigned drop_outstanding_extent(struct inode *inode) |
4843 | { | |
7fd2ae21 | 4844 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4845 | unsigned dropped_extents = 0; |
4846 | ||
9e0baf60 JB |
4847 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4848 | BTRFS_I(inode)->outstanding_extents--; | |
4849 | ||
7fd2ae21 | 4850 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4851 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4852 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4853 | drop_inode_space = 1; |
7fd2ae21 | 4854 | |
9e0baf60 JB |
4855 | /* |
4856 | * If we have more or the same amount of outsanding extents than we have | |
4857 | * reserved then we need to leave the reserved extents count alone. | |
4858 | */ | |
4859 | if (BTRFS_I(inode)->outstanding_extents >= | |
4860 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4861 | return drop_inode_space; |
9e0baf60 JB |
4862 | |
4863 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4864 | BTRFS_I(inode)->outstanding_extents; | |
4865 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4866 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4867 | } |
4868 | ||
7709cde3 JB |
4869 | /** |
4870 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4871 | * reserved/free'd for the given bytes. | |
4872 | * @inode: the inode we're manipulating | |
4873 | * @num_bytes: the number of bytes in question | |
4874 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4875 | * | |
4876 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4877 | * correct amount of metadata that must either be reserved or freed. We | |
4878 | * calculate how many checksums we can fit into one leaf and then divide the | |
4879 | * number of bytes that will need to be checksumed by this value to figure out | |
4880 | * how many checksums will be required. If we are adding bytes then the number | |
4881 | * may go up and we will return the number of additional bytes that must be | |
4882 | * reserved. If it is going down we will return the number of bytes that must | |
4883 | * be freed. | |
4884 | * | |
4885 | * This must be called with BTRFS_I(inode)->lock held. | |
4886 | */ | |
4887 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4888 | int reserve) | |
6324fbf3 | 4889 | { |
7709cde3 JB |
4890 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4891 | u64 csum_size; | |
4892 | int num_csums_per_leaf; | |
4893 | int num_csums; | |
4894 | int old_csums; | |
4895 | ||
4896 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4897 | BTRFS_I(inode)->csum_bytes == 0) | |
4898 | return 0; | |
4899 | ||
4900 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4901 | if (reserve) | |
4902 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4903 | else | |
4904 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4905 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4906 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4907 | sizeof(struct btrfs_csum_item) + | |
4908 | sizeof(struct btrfs_disk_key)); | |
4909 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4910 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4911 | num_csums = num_csums / num_csums_per_leaf; | |
4912 | ||
4913 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4914 | old_csums = old_csums / num_csums_per_leaf; | |
4915 | ||
4916 | /* No change, no need to reserve more */ | |
4917 | if (old_csums == num_csums) | |
4918 | return 0; | |
4919 | ||
4920 | if (reserve) | |
4921 | return btrfs_calc_trans_metadata_size(root, | |
4922 | num_csums - old_csums); | |
4923 | ||
4924 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4925 | } |
c146afad | 4926 | |
0ca1f7ce YZ |
4927 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4928 | { | |
4929 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4930 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4931 | u64 to_reserve = 0; |
660d3f6c | 4932 | u64 csum_bytes; |
9e0baf60 | 4933 | unsigned nr_extents = 0; |
660d3f6c | 4934 | int extra_reserve = 0; |
08e007d2 | 4935 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4936 | int ret = 0; |
c64c2bd8 | 4937 | bool delalloc_lock = true; |
88e081bf WS |
4938 | u64 to_free = 0; |
4939 | unsigned dropped; | |
6324fbf3 | 4940 | |
c64c2bd8 JB |
4941 | /* If we are a free space inode we need to not flush since we will be in |
4942 | * the middle of a transaction commit. We also don't need the delalloc | |
4943 | * mutex since we won't race with anybody. We need this mostly to make | |
4944 | * lockdep shut its filthy mouth. | |
4945 | */ | |
4946 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4947 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4948 | delalloc_lock = false; |
4949 | } | |
c09544e0 | 4950 | |
08e007d2 MX |
4951 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4952 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4953 | schedule_timeout(1); |
ec44a35c | 4954 | |
c64c2bd8 JB |
4955 | if (delalloc_lock) |
4956 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4957 | ||
0ca1f7ce | 4958 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4959 | |
9e0baf60 JB |
4960 | spin_lock(&BTRFS_I(inode)->lock); |
4961 | BTRFS_I(inode)->outstanding_extents++; | |
4962 | ||
4963 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4964 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4965 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4966 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4967 | |
7fd2ae21 JB |
4968 | /* |
4969 | * Add an item to reserve for updating the inode when we complete the | |
4970 | * delalloc io. | |
4971 | */ | |
72ac3c0d JB |
4972 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4973 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4974 | nr_extents++; |
660d3f6c | 4975 | extra_reserve = 1; |
593060d7 | 4976 | } |
7fd2ae21 JB |
4977 | |
4978 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4979 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4980 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4981 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4982 | |
88e081bf | 4983 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4984 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4985 | nr_extents * root->leafsize); | |
88e081bf WS |
4986 | if (ret) |
4987 | goto out_fail; | |
4988 | } | |
c5567237 | 4989 | |
88e081bf WS |
4990 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4991 | if (unlikely(ret)) { | |
4992 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4993 | btrfs_qgroup_free(root, num_bytes + |
4994 | nr_extents * root->leafsize); | |
88e081bf | 4995 | goto out_fail; |
9e0baf60 | 4996 | } |
25179201 | 4997 | |
660d3f6c JB |
4998 | spin_lock(&BTRFS_I(inode)->lock); |
4999 | if (extra_reserve) { | |
72ac3c0d JB |
5000 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
5001 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
5002 | nr_extents--; |
5003 | } | |
5004 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
5005 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
5006 | |
5007 | if (delalloc_lock) | |
5008 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 5009 | |
8c2a3ca2 | 5010 | if (to_reserve) |
67871254 | 5011 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
8c2a3ca2 | 5012 | btrfs_ino(inode), to_reserve, 1); |
0ca1f7ce YZ |
5013 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
5014 | ||
0ca1f7ce | 5015 | return 0; |
88e081bf WS |
5016 | |
5017 | out_fail: | |
5018 | spin_lock(&BTRFS_I(inode)->lock); | |
5019 | dropped = drop_outstanding_extent(inode); | |
5020 | /* | |
5021 | * If the inodes csum_bytes is the same as the original | |
5022 | * csum_bytes then we know we haven't raced with any free()ers | |
5023 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 5024 | */ |
f4881bc7 | 5025 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 5026 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
5027 | } else { |
5028 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5029 | u64 bytes; | |
5030 | ||
5031 | /* | |
5032 | * This is tricky, but first we need to figure out how much we | |
5033 | * free'd from any free-ers that occured during this | |
5034 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
5035 | * before we dropped our lock, and then call the free for the | |
5036 | * number of bytes that were freed while we were trying our | |
5037 | * reservation. | |
5038 | */ | |
5039 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
5040 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
5041 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
5042 | ||
5043 | ||
5044 | /* | |
5045 | * Now we need to see how much we would have freed had we not | |
5046 | * been making this reservation and our ->csum_bytes were not | |
5047 | * artificially inflated. | |
5048 | */ | |
5049 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
5050 | bytes = csum_bytes - orig_csum_bytes; | |
5051 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
5052 | ||
5053 | /* | |
5054 | * Now reset ->csum_bytes to what it should be. If bytes is | |
5055 | * more than to_free then we would have free'd more space had we | |
5056 | * not had an artificially high ->csum_bytes, so we need to free | |
5057 | * the remainder. If bytes is the same or less then we don't | |
5058 | * need to do anything, the other free-ers did the correct | |
5059 | * thing. | |
5060 | */ | |
5061 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5062 | if (bytes > to_free) | |
5063 | to_free = bytes - to_free; | |
5064 | else | |
5065 | to_free = 0; | |
5066 | } | |
88e081bf WS |
5067 | spin_unlock(&BTRFS_I(inode)->lock); |
5068 | if (dropped) | |
5069 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5070 | ||
5071 | if (to_free) { | |
5072 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5073 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5074 | btrfs_ino(inode), to_free, 0); | |
5075 | } | |
5076 | if (delalloc_lock) | |
5077 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5078 | return ret; | |
0ca1f7ce YZ |
5079 | } |
5080 | ||
7709cde3 JB |
5081 | /** |
5082 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5083 | * @inode: the inode to release the reservation for | |
5084 | * @num_bytes: the number of bytes we're releasing | |
5085 | * | |
5086 | * This will release the metadata reservation for an inode. This can be called | |
5087 | * once we complete IO for a given set of bytes to release their metadata | |
5088 | * reservations. | |
5089 | */ | |
0ca1f7ce YZ |
5090 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
5091 | { | |
5092 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
5093 | u64 to_free = 0; |
5094 | unsigned dropped; | |
0ca1f7ce YZ |
5095 | |
5096 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 5097 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 5098 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 5099 | |
0934856d MX |
5100 | if (num_bytes) |
5101 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 5102 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
5103 | if (dropped > 0) |
5104 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 5105 | |
8c2a3ca2 JB |
5106 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
5107 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
5108 | if (root->fs_info->quota_enabled) { |
5109 | btrfs_qgroup_free(root, num_bytes + | |
5110 | dropped * root->leafsize); | |
5111 | } | |
5112 | ||
0ca1f7ce YZ |
5113 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
5114 | to_free); | |
5115 | } | |
5116 | ||
7709cde3 JB |
5117 | /** |
5118 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5119 | * @inode: inode we're writing to | |
5120 | * @num_bytes: the number of bytes we want to allocate | |
5121 | * | |
5122 | * This will do the following things | |
5123 | * | |
5124 | * o reserve space in the data space info for num_bytes | |
5125 | * o reserve space in the metadata space info based on number of outstanding | |
5126 | * extents and how much csums will be needed | |
5127 | * o add to the inodes ->delalloc_bytes | |
5128 | * o add it to the fs_info's delalloc inodes list. | |
5129 | * | |
5130 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5131 | */ | |
0ca1f7ce YZ |
5132 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
5133 | { | |
5134 | int ret; | |
5135 | ||
5136 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 5137 | if (ret) |
0ca1f7ce YZ |
5138 | return ret; |
5139 | ||
5140 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5141 | if (ret) { | |
5142 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5143 | return ret; | |
5144 | } | |
5145 | ||
5146 | return 0; | |
5147 | } | |
5148 | ||
7709cde3 JB |
5149 | /** |
5150 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5151 | * @inode: inode we're releasing space for | |
5152 | * @num_bytes: the number of bytes we want to free up | |
5153 | * | |
5154 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5155 | * called in the case that we don't need the metadata AND data reservations | |
5156 | * anymore. So if there is an error or we insert an inline extent. | |
5157 | * | |
5158 | * This function will release the metadata space that was not used and will | |
5159 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5160 | * list if there are no delalloc bytes left. | |
5161 | */ | |
0ca1f7ce YZ |
5162 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
5163 | { | |
5164 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5165 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
5166 | } |
5167 | ||
c53d613e | 5168 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 5169 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 5170 | { |
0af3d00b | 5171 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 5172 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 5173 | u64 total = num_bytes; |
9078a3e1 | 5174 | u64 old_val; |
db94535d | 5175 | u64 byte_in_group; |
0af3d00b | 5176 | int factor; |
3e1ad54f | 5177 | |
5d4f98a2 | 5178 | /* block accounting for super block */ |
eb73c1b7 | 5179 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 5180 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
5181 | if (alloc) |
5182 | old_val += num_bytes; | |
5183 | else | |
5184 | old_val -= num_bytes; | |
6c41761f | 5185 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 5186 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 5187 | |
d397712b | 5188 | while (total) { |
db94535d | 5189 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 5190 | if (!cache) |
79787eaa | 5191 | return -ENOENT; |
b742bb82 YZ |
5192 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
5193 | BTRFS_BLOCK_GROUP_RAID1 | | |
5194 | BTRFS_BLOCK_GROUP_RAID10)) | |
5195 | factor = 2; | |
5196 | else | |
5197 | factor = 1; | |
9d66e233 JB |
5198 | /* |
5199 | * If this block group has free space cache written out, we | |
5200 | * need to make sure to load it if we are removing space. This | |
5201 | * is because we need the unpinning stage to actually add the | |
5202 | * space back to the block group, otherwise we will leak space. | |
5203 | */ | |
5204 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 5205 | cache_block_group(cache, 1); |
0af3d00b | 5206 | |
db94535d CM |
5207 | byte_in_group = bytenr - cache->key.objectid; |
5208 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 5209 | |
25179201 | 5210 | spin_lock(&cache->space_info->lock); |
c286ac48 | 5211 | spin_lock(&cache->lock); |
0af3d00b | 5212 | |
73bc1876 | 5213 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
5214 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
5215 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5216 | ||
0f9dd46c | 5217 | cache->dirty = 1; |
9078a3e1 | 5218 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 5219 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 5220 | if (alloc) { |
db94535d | 5221 | old_val += num_bytes; |
11833d66 YZ |
5222 | btrfs_set_block_group_used(&cache->item, old_val); |
5223 | cache->reserved -= num_bytes; | |
11833d66 | 5224 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5225 | cache->space_info->bytes_used += num_bytes; |
5226 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5227 | spin_unlock(&cache->lock); |
25179201 | 5228 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5229 | } else { |
db94535d | 5230 | old_val -= num_bytes; |
c286ac48 | 5231 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5232 | cache->pinned += num_bytes; |
5233 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5234 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5235 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5236 | spin_unlock(&cache->lock); |
25179201 | 5237 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5238 | |
f0486c68 YZ |
5239 | set_extent_dirty(info->pinned_extents, |
5240 | bytenr, bytenr + num_bytes - 1, | |
5241 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5242 | } |
fa9c0d79 | 5243 | btrfs_put_block_group(cache); |
db94535d CM |
5244 | total -= num_bytes; |
5245 | bytenr += num_bytes; | |
9078a3e1 CM |
5246 | } |
5247 | return 0; | |
5248 | } | |
6324fbf3 | 5249 | |
a061fc8d CM |
5250 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5251 | { | |
0f9dd46c | 5252 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5253 | u64 bytenr; |
0f9dd46c | 5254 | |
a1897fdd LB |
5255 | spin_lock(&root->fs_info->block_group_cache_lock); |
5256 | bytenr = root->fs_info->first_logical_byte; | |
5257 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5258 | ||
5259 | if (bytenr < (u64)-1) | |
5260 | return bytenr; | |
5261 | ||
0f9dd46c JB |
5262 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5263 | if (!cache) | |
a061fc8d | 5264 | return 0; |
0f9dd46c | 5265 | |
d2fb3437 | 5266 | bytenr = cache->key.objectid; |
fa9c0d79 | 5267 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5268 | |
5269 | return bytenr; | |
a061fc8d CM |
5270 | } |
5271 | ||
f0486c68 YZ |
5272 | static int pin_down_extent(struct btrfs_root *root, |
5273 | struct btrfs_block_group_cache *cache, | |
5274 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5275 | { |
11833d66 YZ |
5276 | spin_lock(&cache->space_info->lock); |
5277 | spin_lock(&cache->lock); | |
5278 | cache->pinned += num_bytes; | |
5279 | cache->space_info->bytes_pinned += num_bytes; | |
5280 | if (reserved) { | |
5281 | cache->reserved -= num_bytes; | |
5282 | cache->space_info->bytes_reserved -= num_bytes; | |
5283 | } | |
5284 | spin_unlock(&cache->lock); | |
5285 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5286 | |
f0486c68 YZ |
5287 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5288 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
0be5dc67 JB |
5289 | if (reserved) |
5290 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); | |
f0486c68 YZ |
5291 | return 0; |
5292 | } | |
68b38550 | 5293 | |
f0486c68 YZ |
5294 | /* |
5295 | * this function must be called within transaction | |
5296 | */ | |
5297 | int btrfs_pin_extent(struct btrfs_root *root, | |
5298 | u64 bytenr, u64 num_bytes, int reserved) | |
5299 | { | |
5300 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5301 | |
f0486c68 | 5302 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5303 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5304 | |
5305 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5306 | ||
5307 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5308 | return 0; |
5309 | } | |
5310 | ||
f0486c68 | 5311 | /* |
e688b725 CM |
5312 | * this function must be called within transaction |
5313 | */ | |
dcfac415 | 5314 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5315 | u64 bytenr, u64 num_bytes) |
5316 | { | |
5317 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 5318 | int ret; |
e688b725 CM |
5319 | |
5320 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
b50c6e25 JB |
5321 | if (!cache) |
5322 | return -EINVAL; | |
e688b725 CM |
5323 | |
5324 | /* | |
5325 | * pull in the free space cache (if any) so that our pin | |
5326 | * removes the free space from the cache. We have load_only set | |
5327 | * to one because the slow code to read in the free extents does check | |
5328 | * the pinned extents. | |
5329 | */ | |
f6373bf3 | 5330 | cache_block_group(cache, 1); |
e688b725 CM |
5331 | |
5332 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5333 | ||
5334 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 5335 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 5336 | btrfs_put_block_group(cache); |
b50c6e25 | 5337 | return ret; |
e688b725 CM |
5338 | } |
5339 | ||
8c2a1a30 JB |
5340 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) |
5341 | { | |
5342 | int ret; | |
5343 | struct btrfs_block_group_cache *block_group; | |
5344 | struct btrfs_caching_control *caching_ctl; | |
5345 | ||
5346 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5347 | if (!block_group) | |
5348 | return -EINVAL; | |
5349 | ||
5350 | cache_block_group(block_group, 0); | |
5351 | caching_ctl = get_caching_control(block_group); | |
5352 | ||
5353 | if (!caching_ctl) { | |
5354 | /* Logic error */ | |
5355 | BUG_ON(!block_group_cache_done(block_group)); | |
5356 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5357 | } else { | |
5358 | mutex_lock(&caching_ctl->mutex); | |
5359 | ||
5360 | if (start >= caching_ctl->progress) { | |
5361 | ret = add_excluded_extent(root, start, num_bytes); | |
5362 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5363 | ret = btrfs_remove_free_space(block_group, | |
5364 | start, num_bytes); | |
5365 | } else { | |
5366 | num_bytes = caching_ctl->progress - start; | |
5367 | ret = btrfs_remove_free_space(block_group, | |
5368 | start, num_bytes); | |
5369 | if (ret) | |
5370 | goto out_lock; | |
5371 | ||
5372 | num_bytes = (start + num_bytes) - | |
5373 | caching_ctl->progress; | |
5374 | start = caching_ctl->progress; | |
5375 | ret = add_excluded_extent(root, start, num_bytes); | |
5376 | } | |
5377 | out_lock: | |
5378 | mutex_unlock(&caching_ctl->mutex); | |
5379 | put_caching_control(caching_ctl); | |
5380 | } | |
5381 | btrfs_put_block_group(block_group); | |
5382 | return ret; | |
5383 | } | |
5384 | ||
5385 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5386 | struct extent_buffer *eb) | |
5387 | { | |
5388 | struct btrfs_file_extent_item *item; | |
5389 | struct btrfs_key key; | |
5390 | int found_type; | |
5391 | int i; | |
5392 | ||
5393 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5394 | return 0; | |
5395 | ||
5396 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5397 | btrfs_item_key_to_cpu(eb, &key, i); | |
5398 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5399 | continue; | |
5400 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5401 | found_type = btrfs_file_extent_type(eb, item); | |
5402 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5403 | continue; | |
5404 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5405 | continue; | |
5406 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5407 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5408 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5409 | } | |
5410 | ||
5411 | return 0; | |
5412 | } | |
5413 | ||
fb25e914 JB |
5414 | /** |
5415 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5416 | * @cache: The cache we are manipulating | |
5417 | * @num_bytes: The number of bytes in question | |
5418 | * @reserve: One of the reservation enums | |
5419 | * | |
5420 | * This is called by the allocator when it reserves space, or by somebody who is | |
5421 | * freeing space that was never actually used on disk. For example if you | |
5422 | * reserve some space for a new leaf in transaction A and before transaction A | |
5423 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5424 | * clear the reservation. | |
5425 | * | |
5426 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5427 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5428 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5429 | * allocating less disk space for the amount of data we have reserved in the | |
5430 | * case of compression. | |
5431 | * | |
5432 | * If this is a reservation and the block group has become read only we cannot | |
5433 | * make the reservation and return -EAGAIN, otherwise this function always | |
5434 | * succeeds. | |
f0486c68 | 5435 | */ |
fb25e914 JB |
5436 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5437 | u64 num_bytes, int reserve) | |
11833d66 | 5438 | { |
fb25e914 | 5439 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5440 | int ret = 0; |
79787eaa | 5441 | |
fb25e914 JB |
5442 | spin_lock(&space_info->lock); |
5443 | spin_lock(&cache->lock); | |
5444 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5445 | if (cache->ro) { |
5446 | ret = -EAGAIN; | |
5447 | } else { | |
fb25e914 JB |
5448 | cache->reserved += num_bytes; |
5449 | space_info->bytes_reserved += num_bytes; | |
5450 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5451 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5452 | "space_info", space_info->flags, |
5453 | num_bytes, 0); | |
fb25e914 JB |
5454 | space_info->bytes_may_use -= num_bytes; |
5455 | } | |
f0486c68 | 5456 | } |
fb25e914 JB |
5457 | } else { |
5458 | if (cache->ro) | |
5459 | space_info->bytes_readonly += num_bytes; | |
5460 | cache->reserved -= num_bytes; | |
5461 | space_info->bytes_reserved -= num_bytes; | |
324ae4df | 5462 | } |
fb25e914 JB |
5463 | spin_unlock(&cache->lock); |
5464 | spin_unlock(&space_info->lock); | |
f0486c68 | 5465 | return ret; |
324ae4df | 5466 | } |
9078a3e1 | 5467 | |
143bede5 | 5468 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5469 | struct btrfs_root *root) |
e8569813 | 5470 | { |
e8569813 | 5471 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5472 | struct btrfs_caching_control *next; |
5473 | struct btrfs_caching_control *caching_ctl; | |
5474 | struct btrfs_block_group_cache *cache; | |
b150a4f1 | 5475 | struct btrfs_space_info *space_info; |
e8569813 | 5476 | |
9e351cc8 | 5477 | down_write(&fs_info->commit_root_sem); |
25179201 | 5478 | |
11833d66 YZ |
5479 | list_for_each_entry_safe(caching_ctl, next, |
5480 | &fs_info->caching_block_groups, list) { | |
5481 | cache = caching_ctl->block_group; | |
5482 | if (block_group_cache_done(cache)) { | |
5483 | cache->last_byte_to_unpin = (u64)-1; | |
5484 | list_del_init(&caching_ctl->list); | |
5485 | put_caching_control(caching_ctl); | |
e8569813 | 5486 | } else { |
11833d66 | 5487 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5488 | } |
e8569813 | 5489 | } |
11833d66 YZ |
5490 | |
5491 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5492 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5493 | else | |
5494 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5495 | ||
9e351cc8 | 5496 | up_write(&fs_info->commit_root_sem); |
8929ecfa | 5497 | |
b150a4f1 JB |
5498 | list_for_each_entry_rcu(space_info, &fs_info->space_info, list) |
5499 | percpu_counter_set(&space_info->total_bytes_pinned, 0); | |
5500 | ||
8929ecfa | 5501 | update_global_block_rsv(fs_info); |
e8569813 ZY |
5502 | } |
5503 | ||
11833d66 | 5504 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5505 | { |
11833d66 YZ |
5506 | struct btrfs_fs_info *fs_info = root->fs_info; |
5507 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5508 | struct btrfs_space_info *space_info; |
5509 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5510 | u64 len; |
7b398f8e | 5511 | bool readonly; |
ccd467d6 | 5512 | |
11833d66 | 5513 | while (start <= end) { |
7b398f8e | 5514 | readonly = false; |
11833d66 YZ |
5515 | if (!cache || |
5516 | start >= cache->key.objectid + cache->key.offset) { | |
5517 | if (cache) | |
5518 | btrfs_put_block_group(cache); | |
5519 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5520 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5521 | } |
5522 | ||
5523 | len = cache->key.objectid + cache->key.offset - start; | |
5524 | len = min(len, end + 1 - start); | |
5525 | ||
5526 | if (start < cache->last_byte_to_unpin) { | |
5527 | len = min(len, cache->last_byte_to_unpin - start); | |
5528 | btrfs_add_free_space(cache, start, len); | |
5529 | } | |
5530 | ||
f0486c68 | 5531 | start += len; |
7b398f8e | 5532 | space_info = cache->space_info; |
f0486c68 | 5533 | |
7b398f8e | 5534 | spin_lock(&space_info->lock); |
11833d66 YZ |
5535 | spin_lock(&cache->lock); |
5536 | cache->pinned -= len; | |
7b398f8e JB |
5537 | space_info->bytes_pinned -= len; |
5538 | if (cache->ro) { | |
5539 | space_info->bytes_readonly += len; | |
5540 | readonly = true; | |
5541 | } | |
11833d66 | 5542 | spin_unlock(&cache->lock); |
7b398f8e JB |
5543 | if (!readonly && global_rsv->space_info == space_info) { |
5544 | spin_lock(&global_rsv->lock); | |
5545 | if (!global_rsv->full) { | |
5546 | len = min(len, global_rsv->size - | |
5547 | global_rsv->reserved); | |
5548 | global_rsv->reserved += len; | |
5549 | space_info->bytes_may_use += len; | |
5550 | if (global_rsv->reserved >= global_rsv->size) | |
5551 | global_rsv->full = 1; | |
5552 | } | |
5553 | spin_unlock(&global_rsv->lock); | |
5554 | } | |
5555 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5556 | } |
11833d66 YZ |
5557 | |
5558 | if (cache) | |
5559 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5560 | return 0; |
5561 | } | |
5562 | ||
5563 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5564 | struct btrfs_root *root) |
a28ec197 | 5565 | { |
11833d66 YZ |
5566 | struct btrfs_fs_info *fs_info = root->fs_info; |
5567 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5568 | u64 start; |
5569 | u64 end; | |
a28ec197 | 5570 | int ret; |
a28ec197 | 5571 | |
79787eaa JM |
5572 | if (trans->aborted) |
5573 | return 0; | |
5574 | ||
11833d66 YZ |
5575 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5576 | unpin = &fs_info->freed_extents[1]; | |
5577 | else | |
5578 | unpin = &fs_info->freed_extents[0]; | |
5579 | ||
d397712b | 5580 | while (1) { |
1a5bc167 | 5581 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5582 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5583 | if (ret) |
a28ec197 | 5584 | break; |
1f3c79a2 | 5585 | |
5378e607 LD |
5586 | if (btrfs_test_opt(root, DISCARD)) |
5587 | ret = btrfs_discard_extent(root, start, | |
5588 | end + 1 - start, NULL); | |
1f3c79a2 | 5589 | |
1a5bc167 | 5590 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5591 | unpin_extent_range(root, start, end); |
b9473439 | 5592 | cond_resched(); |
a28ec197 | 5593 | } |
817d52f8 | 5594 | |
e20d96d6 CM |
5595 | return 0; |
5596 | } | |
5597 | ||
b150a4f1 JB |
5598 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, |
5599 | u64 owner, u64 root_objectid) | |
5600 | { | |
5601 | struct btrfs_space_info *space_info; | |
5602 | u64 flags; | |
5603 | ||
5604 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
5605 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
5606 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
5607 | else | |
5608 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
5609 | } else { | |
5610 | flags = BTRFS_BLOCK_GROUP_DATA; | |
5611 | } | |
5612 | ||
5613 | space_info = __find_space_info(fs_info, flags); | |
5614 | BUG_ON(!space_info); /* Logic bug */ | |
5615 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
5616 | } | |
5617 | ||
5618 | ||
5d4f98a2 YZ |
5619 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5620 | struct btrfs_root *root, | |
5621 | u64 bytenr, u64 num_bytes, u64 parent, | |
5622 | u64 root_objectid, u64 owner_objectid, | |
5623 | u64 owner_offset, int refs_to_drop, | |
5624 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5625 | { |
e2fa7227 | 5626 | struct btrfs_key key; |
5d4f98a2 | 5627 | struct btrfs_path *path; |
1261ec42 CM |
5628 | struct btrfs_fs_info *info = root->fs_info; |
5629 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5630 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5631 | struct btrfs_extent_item *ei; |
5632 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5633 | int ret; |
5d4f98a2 | 5634 | int is_data; |
952fccac CM |
5635 | int extent_slot = 0; |
5636 | int found_extent = 0; | |
5637 | int num_to_del = 1; | |
5d4f98a2 YZ |
5638 | u32 item_size; |
5639 | u64 refs; | |
3173a18f JB |
5640 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
5641 | SKINNY_METADATA); | |
037e6390 | 5642 | |
5caf2a00 | 5643 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5644 | if (!path) |
5645 | return -ENOMEM; | |
5f26f772 | 5646 | |
3c12ac72 | 5647 | path->reada = 1; |
b9473439 | 5648 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5649 | |
5650 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5651 | BUG_ON(!is_data && refs_to_drop != 1); | |
5652 | ||
3173a18f JB |
5653 | if (is_data) |
5654 | skinny_metadata = 0; | |
5655 | ||
5d4f98a2 YZ |
5656 | ret = lookup_extent_backref(trans, extent_root, path, &iref, |
5657 | bytenr, num_bytes, parent, | |
5658 | root_objectid, owner_objectid, | |
5659 | owner_offset); | |
7bb86316 | 5660 | if (ret == 0) { |
952fccac | 5661 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5662 | while (extent_slot >= 0) { |
5663 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5664 | extent_slot); |
5d4f98a2 | 5665 | if (key.objectid != bytenr) |
952fccac | 5666 | break; |
5d4f98a2 YZ |
5667 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5668 | key.offset == num_bytes) { | |
952fccac CM |
5669 | found_extent = 1; |
5670 | break; | |
5671 | } | |
3173a18f JB |
5672 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
5673 | key.offset == owner_objectid) { | |
5674 | found_extent = 1; | |
5675 | break; | |
5676 | } | |
952fccac CM |
5677 | if (path->slots[0] - extent_slot > 5) |
5678 | break; | |
5d4f98a2 | 5679 | extent_slot--; |
952fccac | 5680 | } |
5d4f98a2 YZ |
5681 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5682 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5683 | if (found_extent && item_size < sizeof(*ei)) | |
5684 | found_extent = 0; | |
5685 | #endif | |
31840ae1 | 5686 | if (!found_extent) { |
5d4f98a2 | 5687 | BUG_ON(iref); |
56bec294 | 5688 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5689 | NULL, refs_to_drop, |
5690 | is_data); | |
005d6427 DS |
5691 | if (ret) { |
5692 | btrfs_abort_transaction(trans, extent_root, ret); | |
5693 | goto out; | |
5694 | } | |
b3b4aa74 | 5695 | btrfs_release_path(path); |
b9473439 | 5696 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5697 | |
5698 | key.objectid = bytenr; | |
5699 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5700 | key.offset = num_bytes; | |
5701 | ||
3173a18f JB |
5702 | if (!is_data && skinny_metadata) { |
5703 | key.type = BTRFS_METADATA_ITEM_KEY; | |
5704 | key.offset = owner_objectid; | |
5705 | } | |
5706 | ||
31840ae1 ZY |
5707 | ret = btrfs_search_slot(trans, extent_root, |
5708 | &key, path, -1, 1); | |
3173a18f JB |
5709 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
5710 | /* | |
5711 | * Couldn't find our skinny metadata item, | |
5712 | * see if we have ye olde extent item. | |
5713 | */ | |
5714 | path->slots[0]--; | |
5715 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
5716 | path->slots[0]); | |
5717 | if (key.objectid == bytenr && | |
5718 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
5719 | key.offset == num_bytes) | |
5720 | ret = 0; | |
5721 | } | |
5722 | ||
5723 | if (ret > 0 && skinny_metadata) { | |
5724 | skinny_metadata = false; | |
9ce49a0b | 5725 | key.objectid = bytenr; |
3173a18f JB |
5726 | key.type = BTRFS_EXTENT_ITEM_KEY; |
5727 | key.offset = num_bytes; | |
5728 | btrfs_release_path(path); | |
5729 | ret = btrfs_search_slot(trans, extent_root, | |
5730 | &key, path, -1, 1); | |
5731 | } | |
5732 | ||
f3465ca4 | 5733 | if (ret) { |
c2cf52eb | 5734 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 5735 | ret, bytenr); |
b783e62d JB |
5736 | if (ret > 0) |
5737 | btrfs_print_leaf(extent_root, | |
5738 | path->nodes[0]); | |
f3465ca4 | 5739 | } |
005d6427 DS |
5740 | if (ret < 0) { |
5741 | btrfs_abort_transaction(trans, extent_root, ret); | |
5742 | goto out; | |
5743 | } | |
31840ae1 ZY |
5744 | extent_slot = path->slots[0]; |
5745 | } | |
fae7f21c | 5746 | } else if (WARN_ON(ret == -ENOENT)) { |
7bb86316 | 5747 | btrfs_print_leaf(extent_root, path->nodes[0]); |
c2cf52eb SK |
5748 | btrfs_err(info, |
5749 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
c1c9ff7c GU |
5750 | bytenr, parent, root_objectid, owner_objectid, |
5751 | owner_offset); | |
c4a050bb JB |
5752 | btrfs_abort_transaction(trans, extent_root, ret); |
5753 | goto out; | |
79787eaa | 5754 | } else { |
005d6427 DS |
5755 | btrfs_abort_transaction(trans, extent_root, ret); |
5756 | goto out; | |
7bb86316 | 5757 | } |
5f39d397 CM |
5758 | |
5759 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5760 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5761 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5762 | if (item_size < sizeof(*ei)) { | |
5763 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5764 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5765 | owner_objectid, 0); | |
005d6427 DS |
5766 | if (ret < 0) { |
5767 | btrfs_abort_transaction(trans, extent_root, ret); | |
5768 | goto out; | |
5769 | } | |
5d4f98a2 | 5770 | |
b3b4aa74 | 5771 | btrfs_release_path(path); |
5d4f98a2 YZ |
5772 | path->leave_spinning = 1; |
5773 | ||
5774 | key.objectid = bytenr; | |
5775 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5776 | key.offset = num_bytes; | |
5777 | ||
5778 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5779 | -1, 1); | |
5780 | if (ret) { | |
c2cf52eb | 5781 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", |
c1c9ff7c | 5782 | ret, bytenr); |
5d4f98a2 YZ |
5783 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5784 | } | |
005d6427 DS |
5785 | if (ret < 0) { |
5786 | btrfs_abort_transaction(trans, extent_root, ret); | |
5787 | goto out; | |
5788 | } | |
5789 | ||
5d4f98a2 YZ |
5790 | extent_slot = path->slots[0]; |
5791 | leaf = path->nodes[0]; | |
5792 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5793 | } | |
5794 | #endif | |
5795 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5796 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5797 | struct btrfs_extent_item); |
3173a18f JB |
5798 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
5799 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
5800 | struct btrfs_tree_block_info *bi; |
5801 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5802 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5803 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5804 | } | |
56bec294 | 5805 | |
5d4f98a2 | 5806 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 JB |
5807 | if (refs < refs_to_drop) { |
5808 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
5809 | "for bytenr %Lu\n", refs_to_drop, refs, bytenr); | |
5810 | ret = -EINVAL; | |
5811 | btrfs_abort_transaction(trans, extent_root, ret); | |
5812 | goto out; | |
5813 | } | |
56bec294 | 5814 | refs -= refs_to_drop; |
5f39d397 | 5815 | |
5d4f98a2 YZ |
5816 | if (refs > 0) { |
5817 | if (extent_op) | |
5818 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5819 | /* | |
5820 | * In the case of inline back ref, reference count will | |
5821 | * be updated by remove_extent_backref | |
952fccac | 5822 | */ |
5d4f98a2 YZ |
5823 | if (iref) { |
5824 | BUG_ON(!found_extent); | |
5825 | } else { | |
5826 | btrfs_set_extent_refs(leaf, ei, refs); | |
5827 | btrfs_mark_buffer_dirty(leaf); | |
5828 | } | |
5829 | if (found_extent) { | |
5830 | ret = remove_extent_backref(trans, extent_root, path, | |
5831 | iref, refs_to_drop, | |
5832 | is_data); | |
005d6427 DS |
5833 | if (ret) { |
5834 | btrfs_abort_transaction(trans, extent_root, ret); | |
5835 | goto out; | |
5836 | } | |
952fccac | 5837 | } |
b150a4f1 JB |
5838 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, |
5839 | root_objectid); | |
5d4f98a2 | 5840 | } else { |
5d4f98a2 YZ |
5841 | if (found_extent) { |
5842 | BUG_ON(is_data && refs_to_drop != | |
5843 | extent_data_ref_count(root, path, iref)); | |
5844 | if (iref) { | |
5845 | BUG_ON(path->slots[0] != extent_slot); | |
5846 | } else { | |
5847 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5848 | path->slots[0] = extent_slot; | |
5849 | num_to_del = 2; | |
5850 | } | |
78fae27e | 5851 | } |
b9473439 | 5852 | |
952fccac CM |
5853 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5854 | num_to_del); | |
005d6427 DS |
5855 | if (ret) { |
5856 | btrfs_abort_transaction(trans, extent_root, ret); | |
5857 | goto out; | |
5858 | } | |
b3b4aa74 | 5859 | btrfs_release_path(path); |
21af804c | 5860 | |
5d4f98a2 | 5861 | if (is_data) { |
459931ec | 5862 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5863 | if (ret) { |
5864 | btrfs_abort_transaction(trans, extent_root, ret); | |
5865 | goto out; | |
5866 | } | |
459931ec CM |
5867 | } |
5868 | ||
c53d613e | 5869 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5870 | if (ret) { |
5871 | btrfs_abort_transaction(trans, extent_root, ret); | |
5872 | goto out; | |
5873 | } | |
a28ec197 | 5874 | } |
79787eaa | 5875 | out: |
5caf2a00 | 5876 | btrfs_free_path(path); |
a28ec197 CM |
5877 | return ret; |
5878 | } | |
5879 | ||
1887be66 | 5880 | /* |
f0486c68 | 5881 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5882 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5883 | * a given extent, and if there are no other delayed refs to be processed, it | |
5884 | * removes it from the tree. | |
5885 | */ | |
5886 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5887 | struct btrfs_root *root, u64 bytenr) | |
5888 | { | |
5889 | struct btrfs_delayed_ref_head *head; | |
5890 | struct btrfs_delayed_ref_root *delayed_refs; | |
f0486c68 | 5891 | int ret = 0; |
1887be66 CM |
5892 | |
5893 | delayed_refs = &trans->transaction->delayed_refs; | |
5894 | spin_lock(&delayed_refs->lock); | |
5895 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5896 | if (!head) | |
cf93da7b | 5897 | goto out_delayed_unlock; |
1887be66 | 5898 | |
d7df2c79 JB |
5899 | spin_lock(&head->lock); |
5900 | if (rb_first(&head->ref_root)) | |
1887be66 CM |
5901 | goto out; |
5902 | ||
5d4f98a2 YZ |
5903 | if (head->extent_op) { |
5904 | if (!head->must_insert_reserved) | |
5905 | goto out; | |
78a6184a | 5906 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5907 | head->extent_op = NULL; |
5908 | } | |
5909 | ||
1887be66 CM |
5910 | /* |
5911 | * waiting for the lock here would deadlock. If someone else has it | |
5912 | * locked they are already in the process of dropping it anyway | |
5913 | */ | |
5914 | if (!mutex_trylock(&head->mutex)) | |
5915 | goto out; | |
5916 | ||
5917 | /* | |
5918 | * at this point we have a head with no other entries. Go | |
5919 | * ahead and process it. | |
5920 | */ | |
5921 | head->node.in_tree = 0; | |
c46effa6 | 5922 | rb_erase(&head->href_node, &delayed_refs->href_root); |
c3e69d58 | 5923 | |
d7df2c79 | 5924 | atomic_dec(&delayed_refs->num_entries); |
1887be66 CM |
5925 | |
5926 | /* | |
5927 | * we don't take a ref on the node because we're removing it from the | |
5928 | * tree, so we just steal the ref the tree was holding. | |
5929 | */ | |
c3e69d58 | 5930 | delayed_refs->num_heads--; |
d7df2c79 | 5931 | if (head->processing == 0) |
c3e69d58 | 5932 | delayed_refs->num_heads_ready--; |
d7df2c79 JB |
5933 | head->processing = 0; |
5934 | spin_unlock(&head->lock); | |
1887be66 CM |
5935 | spin_unlock(&delayed_refs->lock); |
5936 | ||
f0486c68 YZ |
5937 | BUG_ON(head->extent_op); |
5938 | if (head->must_insert_reserved) | |
5939 | ret = 1; | |
5940 | ||
5941 | mutex_unlock(&head->mutex); | |
1887be66 | 5942 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5943 | return ret; |
1887be66 | 5944 | out: |
d7df2c79 | 5945 | spin_unlock(&head->lock); |
cf93da7b CM |
5946 | |
5947 | out_delayed_unlock: | |
1887be66 CM |
5948 | spin_unlock(&delayed_refs->lock); |
5949 | return 0; | |
5950 | } | |
5951 | ||
f0486c68 YZ |
5952 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5953 | struct btrfs_root *root, | |
5954 | struct extent_buffer *buf, | |
5581a51a | 5955 | u64 parent, int last_ref) |
f0486c68 | 5956 | { |
f0486c68 | 5957 | struct btrfs_block_group_cache *cache = NULL; |
b150a4f1 | 5958 | int pin = 1; |
f0486c68 YZ |
5959 | int ret; |
5960 | ||
5961 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5962 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5963 | buf->start, buf->len, | |
5964 | parent, root->root_key.objectid, | |
5965 | btrfs_header_level(buf), | |
5581a51a | 5966 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5967 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5968 | } |
5969 | ||
5970 | if (!last_ref) | |
5971 | return; | |
5972 | ||
f0486c68 | 5973 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5974 | |
5975 | if (btrfs_header_generation(buf) == trans->transid) { | |
5976 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5977 | ret = check_ref_cleanup(trans, root, buf->start); | |
5978 | if (!ret) | |
37be25bc | 5979 | goto out; |
f0486c68 YZ |
5980 | } |
5981 | ||
5982 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5983 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5984 | goto out; |
f0486c68 YZ |
5985 | } |
5986 | ||
5987 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5988 | ||
5989 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5990 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
0be5dc67 | 5991 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); |
b150a4f1 | 5992 | pin = 0; |
f0486c68 YZ |
5993 | } |
5994 | out: | |
b150a4f1 JB |
5995 | if (pin) |
5996 | add_pinned_bytes(root->fs_info, buf->len, | |
5997 | btrfs_header_level(buf), | |
5998 | root->root_key.objectid); | |
5999 | ||
a826d6dc JB |
6000 | /* |
6001 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
6002 | * anymore. | |
6003 | */ | |
6004 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
6005 | btrfs_put_block_group(cache); |
6006 | } | |
6007 | ||
79787eaa | 6008 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
6009 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
6010 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
6011 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
6012 | { |
6013 | int ret; | |
66d7e7f0 | 6014 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 6015 | |
b150a4f1 JB |
6016 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); |
6017 | ||
56bec294 CM |
6018 | /* |
6019 | * tree log blocks never actually go into the extent allocation | |
6020 | * tree, just update pinning info and exit early. | |
56bec294 | 6021 | */ |
5d4f98a2 YZ |
6022 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
6023 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 6024 | /* unlocks the pinned mutex */ |
11833d66 | 6025 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 6026 | ret = 0; |
5d4f98a2 | 6027 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
6028 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
6029 | num_bytes, | |
5d4f98a2 | 6030 | parent, root_objectid, (int)owner, |
66d7e7f0 | 6031 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 6032 | } else { |
66d7e7f0 AJ |
6033 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
6034 | num_bytes, | |
6035 | parent, root_objectid, owner, | |
6036 | offset, BTRFS_DROP_DELAYED_REF, | |
6037 | NULL, for_cow); | |
56bec294 | 6038 | } |
925baedd CM |
6039 | return ret; |
6040 | } | |
6041 | ||
53b381b3 DW |
6042 | static u64 stripe_align(struct btrfs_root *root, |
6043 | struct btrfs_block_group_cache *cache, | |
6044 | u64 val, u64 num_bytes) | |
87ee04eb | 6045 | { |
fda2832f | 6046 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
6047 | return ret; |
6048 | } | |
6049 | ||
817d52f8 JB |
6050 | /* |
6051 | * when we wait for progress in the block group caching, its because | |
6052 | * our allocation attempt failed at least once. So, we must sleep | |
6053 | * and let some progress happen before we try again. | |
6054 | * | |
6055 | * This function will sleep at least once waiting for new free space to | |
6056 | * show up, and then it will check the block group free space numbers | |
6057 | * for our min num_bytes. Another option is to have it go ahead | |
6058 | * and look in the rbtree for a free extent of a given size, but this | |
6059 | * is a good start. | |
36cce922 JB |
6060 | * |
6061 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
6062 | * any of the information in this block group. | |
817d52f8 | 6063 | */ |
36cce922 | 6064 | static noinline void |
817d52f8 JB |
6065 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
6066 | u64 num_bytes) | |
6067 | { | |
11833d66 | 6068 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 6069 | |
11833d66 YZ |
6070 | caching_ctl = get_caching_control(cache); |
6071 | if (!caching_ctl) | |
36cce922 | 6072 | return; |
817d52f8 | 6073 | |
11833d66 | 6074 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 6075 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
6076 | |
6077 | put_caching_control(caching_ctl); | |
11833d66 YZ |
6078 | } |
6079 | ||
6080 | static noinline int | |
6081 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6082 | { | |
6083 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 6084 | int ret = 0; |
11833d66 YZ |
6085 | |
6086 | caching_ctl = get_caching_control(cache); | |
6087 | if (!caching_ctl) | |
36cce922 | 6088 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
6089 | |
6090 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
6091 | if (cache->cached == BTRFS_CACHE_ERROR) |
6092 | ret = -EIO; | |
11833d66 | 6093 | put_caching_control(caching_ctl); |
36cce922 | 6094 | return ret; |
817d52f8 JB |
6095 | } |
6096 | ||
31e50229 | 6097 | int __get_raid_index(u64 flags) |
b742bb82 | 6098 | { |
7738a53a | 6099 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 6100 | return BTRFS_RAID_RAID10; |
7738a53a | 6101 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 6102 | return BTRFS_RAID_RAID1; |
7738a53a | 6103 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 6104 | return BTRFS_RAID_DUP; |
7738a53a | 6105 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 6106 | return BTRFS_RAID_RAID0; |
53b381b3 | 6107 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 6108 | return BTRFS_RAID_RAID5; |
53b381b3 | 6109 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 6110 | return BTRFS_RAID_RAID6; |
7738a53a | 6111 | |
e942f883 | 6112 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
6113 | } |
6114 | ||
6ab0a202 | 6115 | int get_block_group_index(struct btrfs_block_group_cache *cache) |
7738a53a | 6116 | { |
31e50229 | 6117 | return __get_raid_index(cache->flags); |
7738a53a ID |
6118 | } |
6119 | ||
6ab0a202 JM |
6120 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { |
6121 | [BTRFS_RAID_RAID10] = "raid10", | |
6122 | [BTRFS_RAID_RAID1] = "raid1", | |
6123 | [BTRFS_RAID_DUP] = "dup", | |
6124 | [BTRFS_RAID_RAID0] = "raid0", | |
6125 | [BTRFS_RAID_SINGLE] = "single", | |
6126 | [BTRFS_RAID_RAID5] = "raid5", | |
6127 | [BTRFS_RAID_RAID6] = "raid6", | |
6128 | }; | |
6129 | ||
1b8e5df6 | 6130 | static const char *get_raid_name(enum btrfs_raid_types type) |
6ab0a202 JM |
6131 | { |
6132 | if (type >= BTRFS_NR_RAID_TYPES) | |
6133 | return NULL; | |
6134 | ||
6135 | return btrfs_raid_type_names[type]; | |
6136 | } | |
6137 | ||
817d52f8 | 6138 | enum btrfs_loop_type { |
285ff5af JB |
6139 | LOOP_CACHING_NOWAIT = 0, |
6140 | LOOP_CACHING_WAIT = 1, | |
6141 | LOOP_ALLOC_CHUNK = 2, | |
6142 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
6143 | }; |
6144 | ||
fec577fb CM |
6145 | /* |
6146 | * walks the btree of allocated extents and find a hole of a given size. | |
6147 | * The key ins is changed to record the hole: | |
a4820398 | 6148 | * ins->objectid == start position |
62e2749e | 6149 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
a4820398 | 6150 | * ins->offset == the size of the hole. |
fec577fb | 6151 | * Any available blocks before search_start are skipped. |
a4820398 MX |
6152 | * |
6153 | * If there is no suitable free space, we will record the max size of | |
6154 | * the free space extent currently. | |
fec577fb | 6155 | */ |
00361589 | 6156 | static noinline int find_free_extent(struct btrfs_root *orig_root, |
98ed5174 | 6157 | u64 num_bytes, u64 empty_size, |
98ed5174 | 6158 | u64 hint_byte, struct btrfs_key *ins, |
b6919a58 | 6159 | u64 flags) |
fec577fb | 6160 | { |
80eb234a | 6161 | int ret = 0; |
d397712b | 6162 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 6163 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 6164 | struct btrfs_block_group_cache *block_group = NULL; |
81c9ad23 | 6165 | u64 search_start = 0; |
a4820398 | 6166 | u64 max_extent_size = 0; |
239b14b3 | 6167 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 6168 | struct btrfs_space_info *space_info; |
fa9c0d79 | 6169 | int loop = 0; |
b6919a58 DS |
6170 | int index = __get_raid_index(flags); |
6171 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
fb25e914 | 6172 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; |
0a24325e | 6173 | bool failed_cluster_refill = false; |
1cdda9b8 | 6174 | bool failed_alloc = false; |
67377734 | 6175 | bool use_cluster = true; |
60d2adbb | 6176 | bool have_caching_bg = false; |
fec577fb | 6177 | |
db94535d | 6178 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 6179 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
6180 | ins->objectid = 0; |
6181 | ins->offset = 0; | |
b1a4d965 | 6182 | |
b6919a58 | 6183 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); |
3f7de037 | 6184 | |
b6919a58 | 6185 | space_info = __find_space_info(root->fs_info, flags); |
1b1d1f66 | 6186 | if (!space_info) { |
b6919a58 | 6187 | btrfs_err(root->fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
6188 | return -ENOSPC; |
6189 | } | |
2552d17e | 6190 | |
67377734 JB |
6191 | /* |
6192 | * If the space info is for both data and metadata it means we have a | |
6193 | * small filesystem and we can't use the clustering stuff. | |
6194 | */ | |
6195 | if (btrfs_mixed_space_info(space_info)) | |
6196 | use_cluster = false; | |
6197 | ||
b6919a58 | 6198 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 6199 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
6200 | if (!btrfs_test_opt(root, SSD)) |
6201 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
6202 | } |
6203 | ||
b6919a58 | 6204 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
67377734 | 6205 | btrfs_test_opt(root, SSD)) { |
fa9c0d79 CM |
6206 | last_ptr = &root->fs_info->data_alloc_cluster; |
6207 | } | |
0f9dd46c | 6208 | |
239b14b3 | 6209 | if (last_ptr) { |
fa9c0d79 CM |
6210 | spin_lock(&last_ptr->lock); |
6211 | if (last_ptr->block_group) | |
6212 | hint_byte = last_ptr->window_start; | |
6213 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 6214 | } |
fa9c0d79 | 6215 | |
a061fc8d | 6216 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 6217 | search_start = max(search_start, hint_byte); |
0b86a832 | 6218 | |
817d52f8 | 6219 | if (!last_ptr) |
fa9c0d79 | 6220 | empty_cluster = 0; |
fa9c0d79 | 6221 | |
2552d17e | 6222 | if (search_start == hint_byte) { |
2552d17e JB |
6223 | block_group = btrfs_lookup_block_group(root->fs_info, |
6224 | search_start); | |
817d52f8 JB |
6225 | /* |
6226 | * we don't want to use the block group if it doesn't match our | |
6227 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
6228 | * |
6229 | * However if we are re-searching with an ideal block group | |
6230 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 6231 | */ |
b6919a58 | 6232 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 6233 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 6234 | down_read(&space_info->groups_sem); |
44fb5511 CM |
6235 | if (list_empty(&block_group->list) || |
6236 | block_group->ro) { | |
6237 | /* | |
6238 | * someone is removing this block group, | |
6239 | * we can't jump into the have_block_group | |
6240 | * target because our list pointers are not | |
6241 | * valid | |
6242 | */ | |
6243 | btrfs_put_block_group(block_group); | |
6244 | up_read(&space_info->groups_sem); | |
ccf0e725 | 6245 | } else { |
b742bb82 | 6246 | index = get_block_group_index(block_group); |
44fb5511 | 6247 | goto have_block_group; |
ccf0e725 | 6248 | } |
2552d17e | 6249 | } else if (block_group) { |
fa9c0d79 | 6250 | btrfs_put_block_group(block_group); |
2552d17e | 6251 | } |
42e70e7a | 6252 | } |
2552d17e | 6253 | search: |
60d2adbb | 6254 | have_caching_bg = false; |
80eb234a | 6255 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
6256 | list_for_each_entry(block_group, &space_info->block_groups[index], |
6257 | list) { | |
6226cb0a | 6258 | u64 offset; |
817d52f8 | 6259 | int cached; |
8a1413a2 | 6260 | |
11dfe35a | 6261 | btrfs_get_block_group(block_group); |
2552d17e | 6262 | search_start = block_group->key.objectid; |
42e70e7a | 6263 | |
83a50de9 CM |
6264 | /* |
6265 | * this can happen if we end up cycling through all the | |
6266 | * raid types, but we want to make sure we only allocate | |
6267 | * for the proper type. | |
6268 | */ | |
b6919a58 | 6269 | if (!block_group_bits(block_group, flags)) { |
83a50de9 CM |
6270 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
6271 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
6272 | BTRFS_BLOCK_GROUP_RAID5 | |
6273 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
6274 | BTRFS_BLOCK_GROUP_RAID10; |
6275 | ||
6276 | /* | |
6277 | * if they asked for extra copies and this block group | |
6278 | * doesn't provide them, bail. This does allow us to | |
6279 | * fill raid0 from raid1. | |
6280 | */ | |
b6919a58 | 6281 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
6282 | goto loop; |
6283 | } | |
6284 | ||
2552d17e | 6285 | have_block_group: |
291c7d2f JB |
6286 | cached = block_group_cache_done(block_group); |
6287 | if (unlikely(!cached)) { | |
f6373bf3 | 6288 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
6289 | BUG_ON(ret < 0); |
6290 | ret = 0; | |
817d52f8 JB |
6291 | } |
6292 | ||
36cce922 JB |
6293 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
6294 | goto loop; | |
ea6a478e | 6295 | if (unlikely(block_group->ro)) |
2552d17e | 6296 | goto loop; |
0f9dd46c | 6297 | |
0a24325e | 6298 | /* |
062c05c4 AO |
6299 | * Ok we want to try and use the cluster allocator, so |
6300 | * lets look there | |
0a24325e | 6301 | */ |
062c05c4 | 6302 | if (last_ptr) { |
215a63d1 | 6303 | struct btrfs_block_group_cache *used_block_group; |
8de972b4 | 6304 | unsigned long aligned_cluster; |
fa9c0d79 CM |
6305 | /* |
6306 | * the refill lock keeps out other | |
6307 | * people trying to start a new cluster | |
6308 | */ | |
6309 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
6310 | used_block_group = last_ptr->block_group; |
6311 | if (used_block_group != block_group && | |
6312 | (!used_block_group || | |
6313 | used_block_group->ro || | |
215a63d1 | 6314 | !block_group_bits(used_block_group, flags))) |
44fb5511 | 6315 | goto refill_cluster; |
274bd4fb AO |
6316 | |
6317 | if (used_block_group != block_group) | |
6318 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 6319 | |
274bd4fb | 6320 | offset = btrfs_alloc_from_cluster(used_block_group, |
a4820398 MX |
6321 | last_ptr, |
6322 | num_bytes, | |
6323 | used_block_group->key.objectid, | |
6324 | &max_extent_size); | |
fa9c0d79 CM |
6325 | if (offset) { |
6326 | /* we have a block, we're done */ | |
6327 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 | 6328 | trace_btrfs_reserve_extent_cluster(root, |
89d4346a MX |
6329 | used_block_group, |
6330 | search_start, num_bytes); | |
215a63d1 MX |
6331 | if (used_block_group != block_group) { |
6332 | btrfs_put_block_group(block_group); | |
6333 | block_group = used_block_group; | |
6334 | } | |
fa9c0d79 CM |
6335 | goto checks; |
6336 | } | |
6337 | ||
274bd4fb | 6338 | WARN_ON(last_ptr->block_group != used_block_group); |
215a63d1 | 6339 | if (used_block_group != block_group) |
274bd4fb | 6340 | btrfs_put_block_group(used_block_group); |
44fb5511 | 6341 | refill_cluster: |
062c05c4 AO |
6342 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
6343 | * set up a new clusters, so lets just skip it | |
6344 | * and let the allocator find whatever block | |
6345 | * it can find. If we reach this point, we | |
6346 | * will have tried the cluster allocator | |
6347 | * plenty of times and not have found | |
6348 | * anything, so we are likely way too | |
6349 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
6350 | * anything. |
6351 | * | |
6352 | * However, if the cluster is taken from the | |
6353 | * current block group, release the cluster | |
6354 | * first, so that we stand a better chance of | |
6355 | * succeeding in the unclustered | |
6356 | * allocation. */ | |
6357 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6358 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
6359 | spin_unlock(&last_ptr->refill_lock); |
6360 | goto unclustered_alloc; | |
6361 | } | |
6362 | ||
fa9c0d79 CM |
6363 | /* |
6364 | * this cluster didn't work out, free it and | |
6365 | * start over | |
6366 | */ | |
6367 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6368 | ||
a5f6f719 AO |
6369 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
6370 | spin_unlock(&last_ptr->refill_lock); | |
6371 | goto unclustered_alloc; | |
6372 | } | |
6373 | ||
8de972b4 CM |
6374 | aligned_cluster = max_t(unsigned long, |
6375 | empty_cluster + empty_size, | |
6376 | block_group->full_stripe_len); | |
6377 | ||
fa9c0d79 | 6378 | /* allocate a cluster in this block group */ |
00361589 JB |
6379 | ret = btrfs_find_space_cluster(root, block_group, |
6380 | last_ptr, search_start, | |
6381 | num_bytes, | |
6382 | aligned_cluster); | |
fa9c0d79 CM |
6383 | if (ret == 0) { |
6384 | /* | |
6385 | * now pull our allocation out of this | |
6386 | * cluster | |
6387 | */ | |
6388 | offset = btrfs_alloc_from_cluster(block_group, | |
a4820398 MX |
6389 | last_ptr, |
6390 | num_bytes, | |
6391 | search_start, | |
6392 | &max_extent_size); | |
fa9c0d79 CM |
6393 | if (offset) { |
6394 | /* we found one, proceed */ | |
6395 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
6396 | trace_btrfs_reserve_extent_cluster(root, |
6397 | block_group, search_start, | |
6398 | num_bytes); | |
fa9c0d79 CM |
6399 | goto checks; |
6400 | } | |
0a24325e JB |
6401 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6402 | && !failed_cluster_refill) { | |
817d52f8 JB |
6403 | spin_unlock(&last_ptr->refill_lock); |
6404 | ||
0a24325e | 6405 | failed_cluster_refill = true; |
817d52f8 JB |
6406 | wait_block_group_cache_progress(block_group, |
6407 | num_bytes + empty_cluster + empty_size); | |
6408 | goto have_block_group; | |
fa9c0d79 | 6409 | } |
817d52f8 | 6410 | |
fa9c0d79 CM |
6411 | /* |
6412 | * at this point we either didn't find a cluster | |
6413 | * or we weren't able to allocate a block from our | |
6414 | * cluster. Free the cluster we've been trying | |
6415 | * to use, and go to the next block group | |
6416 | */ | |
0a24325e | 6417 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6418 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6419 | goto loop; |
fa9c0d79 CM |
6420 | } |
6421 | ||
062c05c4 | 6422 | unclustered_alloc: |
a5f6f719 AO |
6423 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6424 | if (cached && | |
6425 | block_group->free_space_ctl->free_space < | |
6426 | num_bytes + empty_cluster + empty_size) { | |
a4820398 MX |
6427 | if (block_group->free_space_ctl->free_space > |
6428 | max_extent_size) | |
6429 | max_extent_size = | |
6430 | block_group->free_space_ctl->free_space; | |
a5f6f719 AO |
6431 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
6432 | goto loop; | |
6433 | } | |
6434 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6435 | ||
6226cb0a | 6436 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
a4820398 MX |
6437 | num_bytes, empty_size, |
6438 | &max_extent_size); | |
1cdda9b8 JB |
6439 | /* |
6440 | * If we didn't find a chunk, and we haven't failed on this | |
6441 | * block group before, and this block group is in the middle of | |
6442 | * caching and we are ok with waiting, then go ahead and wait | |
6443 | * for progress to be made, and set failed_alloc to true. | |
6444 | * | |
6445 | * If failed_alloc is true then we've already waited on this | |
6446 | * block group once and should move on to the next block group. | |
6447 | */ | |
6448 | if (!offset && !failed_alloc && !cached && | |
6449 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6450 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6451 | num_bytes + empty_size); |
6452 | failed_alloc = true; | |
817d52f8 | 6453 | goto have_block_group; |
1cdda9b8 | 6454 | } else if (!offset) { |
60d2adbb MX |
6455 | if (!cached) |
6456 | have_caching_bg = true; | |
1cdda9b8 | 6457 | goto loop; |
817d52f8 | 6458 | } |
fa9c0d79 | 6459 | checks: |
215a63d1 | 6460 | search_start = stripe_align(root, block_group, |
53b381b3 | 6461 | offset, num_bytes); |
25179201 | 6462 | |
2552d17e JB |
6463 | /* move on to the next group */ |
6464 | if (search_start + num_bytes > | |
215a63d1 MX |
6465 | block_group->key.objectid + block_group->key.offset) { |
6466 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 6467 | goto loop; |
6226cb0a | 6468 | } |
f5a31e16 | 6469 | |
f0486c68 | 6470 | if (offset < search_start) |
215a63d1 | 6471 | btrfs_add_free_space(block_group, offset, |
f0486c68 YZ |
6472 | search_start - offset); |
6473 | BUG_ON(offset > search_start); | |
2552d17e | 6474 | |
215a63d1 | 6475 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, |
fb25e914 | 6476 | alloc_type); |
f0486c68 | 6477 | if (ret == -EAGAIN) { |
215a63d1 | 6478 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 6479 | goto loop; |
0f9dd46c | 6480 | } |
0b86a832 | 6481 | |
f0486c68 | 6482 | /* we are all good, lets return */ |
2552d17e JB |
6483 | ins->objectid = search_start; |
6484 | ins->offset = num_bytes; | |
d2fb3437 | 6485 | |
3f7de037 JB |
6486 | trace_btrfs_reserve_extent(orig_root, block_group, |
6487 | search_start, num_bytes); | |
d82a6f1d | 6488 | btrfs_put_block_group(block_group); |
2552d17e JB |
6489 | break; |
6490 | loop: | |
0a24325e | 6491 | failed_cluster_refill = false; |
1cdda9b8 | 6492 | failed_alloc = false; |
b742bb82 | 6493 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 6494 | btrfs_put_block_group(block_group); |
2552d17e JB |
6495 | } |
6496 | up_read(&space_info->groups_sem); | |
6497 | ||
60d2adbb MX |
6498 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6499 | goto search; | |
6500 | ||
b742bb82 YZ |
6501 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6502 | goto search; | |
6503 | ||
285ff5af | 6504 | /* |
ccf0e725 JB |
6505 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6506 | * caching kthreads as we move along | |
817d52f8 JB |
6507 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6508 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6509 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6510 | * again | |
fa9c0d79 | 6511 | */ |
723bda20 | 6512 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6513 | index = 0; |
723bda20 | 6514 | loop++; |
817d52f8 | 6515 | if (loop == LOOP_ALLOC_CHUNK) { |
00361589 JB |
6516 | struct btrfs_trans_handle *trans; |
6517 | ||
6518 | trans = btrfs_join_transaction(root); | |
6519 | if (IS_ERR(trans)) { | |
6520 | ret = PTR_ERR(trans); | |
6521 | goto out; | |
6522 | } | |
6523 | ||
b6919a58 | 6524 | ret = do_chunk_alloc(trans, root, flags, |
ea658bad JB |
6525 | CHUNK_ALLOC_FORCE); |
6526 | /* | |
6527 | * Do not bail out on ENOSPC since we | |
6528 | * can do more things. | |
6529 | */ | |
00361589 | 6530 | if (ret < 0 && ret != -ENOSPC) |
ea658bad JB |
6531 | btrfs_abort_transaction(trans, |
6532 | root, ret); | |
00361589 JB |
6533 | else |
6534 | ret = 0; | |
6535 | btrfs_end_transaction(trans, root); | |
6536 | if (ret) | |
ea658bad | 6537 | goto out; |
2552d17e JB |
6538 | } |
6539 | ||
723bda20 JB |
6540 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6541 | empty_size = 0; | |
6542 | empty_cluster = 0; | |
fa9c0d79 | 6543 | } |
723bda20 JB |
6544 | |
6545 | goto search; | |
2552d17e JB |
6546 | } else if (!ins->objectid) { |
6547 | ret = -ENOSPC; | |
d82a6f1d | 6548 | } else if (ins->objectid) { |
80eb234a | 6549 | ret = 0; |
be744175 | 6550 | } |
79787eaa | 6551 | out: |
a4820398 MX |
6552 | if (ret == -ENOSPC) |
6553 | ins->offset = max_extent_size; | |
0f70abe2 | 6554 | return ret; |
fec577fb | 6555 | } |
ec44a35c | 6556 | |
9ed74f2d JB |
6557 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6558 | int dump_block_groups) | |
0f9dd46c JB |
6559 | { |
6560 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6561 | int index = 0; |
0f9dd46c | 6562 | |
9ed74f2d | 6563 | spin_lock(&info->lock); |
efe120a0 | 6564 | printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n", |
c1c9ff7c GU |
6565 | info->flags, |
6566 | info->total_bytes - info->bytes_used - info->bytes_pinned - | |
6567 | info->bytes_reserved - info->bytes_readonly, | |
d397712b | 6568 | (info->full) ? "" : "not "); |
efe120a0 | 6569 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " |
8929ecfa | 6570 | "reserved=%llu, may_use=%llu, readonly=%llu\n", |
c1c9ff7c GU |
6571 | info->total_bytes, info->bytes_used, info->bytes_pinned, |
6572 | info->bytes_reserved, info->bytes_may_use, | |
6573 | info->bytes_readonly); | |
9ed74f2d JB |
6574 | spin_unlock(&info->lock); |
6575 | ||
6576 | if (!dump_block_groups) | |
6577 | return; | |
0f9dd46c | 6578 | |
80eb234a | 6579 | down_read(&info->groups_sem); |
b742bb82 YZ |
6580 | again: |
6581 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6582 | spin_lock(&cache->lock); |
efe120a0 FH |
6583 | printk(KERN_INFO "BTRFS: " |
6584 | "block group %llu has %llu bytes, " | |
6585 | "%llu used %llu pinned %llu reserved %s\n", | |
c1c9ff7c GU |
6586 | cache->key.objectid, cache->key.offset, |
6587 | btrfs_block_group_used(&cache->item), cache->pinned, | |
6588 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6589 | btrfs_dump_free_space(cache, bytes); |
6590 | spin_unlock(&cache->lock); | |
6591 | } | |
b742bb82 YZ |
6592 | if (++index < BTRFS_NR_RAID_TYPES) |
6593 | goto again; | |
80eb234a | 6594 | up_read(&info->groups_sem); |
0f9dd46c | 6595 | } |
e8569813 | 6596 | |
00361589 | 6597 | int btrfs_reserve_extent(struct btrfs_root *root, |
11833d66 YZ |
6598 | u64 num_bytes, u64 min_alloc_size, |
6599 | u64 empty_size, u64 hint_byte, | |
b6919a58 | 6600 | struct btrfs_key *ins, int is_data) |
fec577fb | 6601 | { |
9e622d6b | 6602 | bool final_tried = false; |
b6919a58 | 6603 | u64 flags; |
fec577fb | 6604 | int ret; |
925baedd | 6605 | |
b6919a58 | 6606 | flags = btrfs_get_alloc_profile(root, is_data); |
98d20f67 | 6607 | again: |
db94535d | 6608 | WARN_ON(num_bytes < root->sectorsize); |
00361589 JB |
6609 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, |
6610 | flags); | |
3b951516 | 6611 | |
9e622d6b | 6612 | if (ret == -ENOSPC) { |
a4820398 MX |
6613 | if (!final_tried && ins->offset) { |
6614 | num_bytes = min(num_bytes >> 1, ins->offset); | |
24542bf7 | 6615 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6616 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6617 | if (num_bytes == min_alloc_size) |
6618 | final_tried = true; | |
6619 | goto again; | |
6620 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6621 | struct btrfs_space_info *sinfo; | |
6622 | ||
b6919a58 | 6623 | sinfo = __find_space_info(root->fs_info, flags); |
c2cf52eb | 6624 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", |
c1c9ff7c | 6625 | flags, num_bytes); |
53804280 JM |
6626 | if (sinfo) |
6627 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6628 | } |
925baedd | 6629 | } |
0f9dd46c JB |
6630 | |
6631 | return ret; | |
e6dcd2dc CM |
6632 | } |
6633 | ||
e688b725 CM |
6634 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6635 | u64 start, u64 len, int pin) | |
65b51a00 | 6636 | { |
0f9dd46c | 6637 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6638 | int ret = 0; |
0f9dd46c | 6639 | |
0f9dd46c JB |
6640 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6641 | if (!cache) { | |
c2cf52eb | 6642 | btrfs_err(root->fs_info, "Unable to find block group for %llu", |
c1c9ff7c | 6643 | start); |
0f9dd46c JB |
6644 | return -ENOSPC; |
6645 | } | |
1f3c79a2 | 6646 | |
5378e607 LD |
6647 | if (btrfs_test_opt(root, DISCARD)) |
6648 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6649 | |
e688b725 CM |
6650 | if (pin) |
6651 | pin_down_extent(root, cache, start, len, 1); | |
6652 | else { | |
6653 | btrfs_add_free_space(cache, start, len); | |
6654 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6655 | } | |
fa9c0d79 | 6656 | btrfs_put_block_group(cache); |
817d52f8 | 6657 | |
1abe9b8a | 6658 | trace_btrfs_reserved_extent_free(root, start, len); |
6659 | ||
e6dcd2dc CM |
6660 | return ret; |
6661 | } | |
6662 | ||
e688b725 CM |
6663 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6664 | u64 start, u64 len) | |
6665 | { | |
6666 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6667 | } | |
6668 | ||
6669 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6670 | u64 start, u64 len) | |
6671 | { | |
6672 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6673 | } | |
6674 | ||
5d4f98a2 YZ |
6675 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6676 | struct btrfs_root *root, | |
6677 | u64 parent, u64 root_objectid, | |
6678 | u64 flags, u64 owner, u64 offset, | |
6679 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6680 | { |
6681 | int ret; | |
5d4f98a2 | 6682 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6683 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6684 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6685 | struct btrfs_path *path; |
5d4f98a2 YZ |
6686 | struct extent_buffer *leaf; |
6687 | int type; | |
6688 | u32 size; | |
26b8003f | 6689 | |
5d4f98a2 YZ |
6690 | if (parent > 0) |
6691 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6692 | else | |
6693 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6694 | |
5d4f98a2 | 6695 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6696 | |
6697 | path = btrfs_alloc_path(); | |
db5b493a TI |
6698 | if (!path) |
6699 | return -ENOMEM; | |
47e4bb98 | 6700 | |
b9473439 | 6701 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6702 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6703 | ins, size); | |
79787eaa JM |
6704 | if (ret) { |
6705 | btrfs_free_path(path); | |
6706 | return ret; | |
6707 | } | |
0f9dd46c | 6708 | |
5d4f98a2 YZ |
6709 | leaf = path->nodes[0]; |
6710 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6711 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6712 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6713 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6714 | btrfs_set_extent_flags(leaf, extent_item, | |
6715 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6716 | ||
6717 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6718 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6719 | if (parent > 0) { | |
6720 | struct btrfs_shared_data_ref *ref; | |
6721 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6722 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6723 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6724 | } else { | |
6725 | struct btrfs_extent_data_ref *ref; | |
6726 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6727 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6728 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6729 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6730 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6731 | } | |
47e4bb98 CM |
6732 | |
6733 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6734 | btrfs_free_path(path); |
f510cfec | 6735 | |
c53d613e | 6736 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6737 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 6738 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 6739 | ins->objectid, ins->offset); |
f5947066 CM |
6740 | BUG(); |
6741 | } | |
0be5dc67 | 6742 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
e6dcd2dc CM |
6743 | return ret; |
6744 | } | |
6745 | ||
5d4f98a2 YZ |
6746 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6747 | struct btrfs_root *root, | |
6748 | u64 parent, u64 root_objectid, | |
6749 | u64 flags, struct btrfs_disk_key *key, | |
6750 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6751 | { |
6752 | int ret; | |
5d4f98a2 YZ |
6753 | struct btrfs_fs_info *fs_info = root->fs_info; |
6754 | struct btrfs_extent_item *extent_item; | |
6755 | struct btrfs_tree_block_info *block_info; | |
6756 | struct btrfs_extent_inline_ref *iref; | |
6757 | struct btrfs_path *path; | |
6758 | struct extent_buffer *leaf; | |
3173a18f JB |
6759 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
6760 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6761 | SKINNY_METADATA); | |
6762 | ||
6763 | if (!skinny_metadata) | |
6764 | size += sizeof(*block_info); | |
1c2308f8 | 6765 | |
5d4f98a2 | 6766 | path = btrfs_alloc_path(); |
857cc2fc JB |
6767 | if (!path) { |
6768 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, | |
6769 | root->leafsize); | |
d8926bb3 | 6770 | return -ENOMEM; |
857cc2fc | 6771 | } |
56bec294 | 6772 | |
5d4f98a2 YZ |
6773 | path->leave_spinning = 1; |
6774 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6775 | ins, size); | |
79787eaa | 6776 | if (ret) { |
857cc2fc JB |
6777 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, |
6778 | root->leafsize); | |
79787eaa JM |
6779 | btrfs_free_path(path); |
6780 | return ret; | |
6781 | } | |
5d4f98a2 YZ |
6782 | |
6783 | leaf = path->nodes[0]; | |
6784 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6785 | struct btrfs_extent_item); | |
6786 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6787 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6788 | btrfs_set_extent_flags(leaf, extent_item, | |
6789 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 6790 | |
3173a18f JB |
6791 | if (skinny_metadata) { |
6792 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6793 | } else { | |
6794 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6795 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6796 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6797 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6798 | } | |
5d4f98a2 | 6799 | |
5d4f98a2 YZ |
6800 | if (parent > 0) { |
6801 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6802 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6803 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6804 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6805 | } else { | |
6806 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6807 | BTRFS_TREE_BLOCK_REF_KEY); | |
6808 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6809 | } | |
6810 | ||
6811 | btrfs_mark_buffer_dirty(leaf); | |
6812 | btrfs_free_path(path); | |
6813 | ||
3173a18f | 6814 | ret = update_block_group(root, ins->objectid, root->leafsize, 1); |
79787eaa | 6815 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 6816 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 6817 | ins->objectid, ins->offset); |
5d4f98a2 YZ |
6818 | BUG(); |
6819 | } | |
0be5dc67 JB |
6820 | |
6821 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->leafsize); | |
5d4f98a2 YZ |
6822 | return ret; |
6823 | } | |
6824 | ||
6825 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6826 | struct btrfs_root *root, | |
6827 | u64 root_objectid, u64 owner, | |
6828 | u64 offset, struct btrfs_key *ins) | |
6829 | { | |
6830 | int ret; | |
6831 | ||
6832 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6833 | ||
66d7e7f0 AJ |
6834 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6835 | ins->offset, 0, | |
6836 | root_objectid, owner, offset, | |
6837 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6838 | return ret; |
6839 | } | |
e02119d5 CM |
6840 | |
6841 | /* | |
6842 | * this is used by the tree logging recovery code. It records that | |
6843 | * an extent has been allocated and makes sure to clear the free | |
6844 | * space cache bits as well | |
6845 | */ | |
5d4f98a2 YZ |
6846 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6847 | struct btrfs_root *root, | |
6848 | u64 root_objectid, u64 owner, u64 offset, | |
6849 | struct btrfs_key *ins) | |
e02119d5 CM |
6850 | { |
6851 | int ret; | |
6852 | struct btrfs_block_group_cache *block_group; | |
11833d66 | 6853 | |
8c2a1a30 JB |
6854 | /* |
6855 | * Mixed block groups will exclude before processing the log so we only | |
6856 | * need to do the exlude dance if this fs isn't mixed. | |
6857 | */ | |
6858 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
6859 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
b50c6e25 | 6860 | if (ret) |
8c2a1a30 | 6861 | return ret; |
11833d66 YZ |
6862 | } |
6863 | ||
8c2a1a30 JB |
6864 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
6865 | if (!block_group) | |
6866 | return -EINVAL; | |
6867 | ||
fb25e914 JB |
6868 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6869 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6870 | BUG_ON(ret); /* logic error */ |
5d4f98a2 YZ |
6871 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6872 | 0, owner, offset, ins, 1); | |
b50c6e25 | 6873 | btrfs_put_block_group(block_group); |
e02119d5 CM |
6874 | return ret; |
6875 | } | |
6876 | ||
48a3b636 ES |
6877 | static struct extent_buffer * |
6878 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
6879 | u64 bytenr, u32 blocksize, int level) | |
65b51a00 CM |
6880 | { |
6881 | struct extent_buffer *buf; | |
6882 | ||
6883 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6884 | if (!buf) | |
6885 | return ERR_PTR(-ENOMEM); | |
6886 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6887 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6888 | btrfs_tree_lock(buf); |
6889 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6890 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6891 | |
6892 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6893 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6894 | |
d0c803c4 | 6895 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6896 | /* |
6897 | * we allow two log transactions at a time, use different | |
6898 | * EXENT bit to differentiate dirty pages. | |
6899 | */ | |
6900 | if (root->log_transid % 2 == 0) | |
6901 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6902 | buf->start + buf->len - 1, GFP_NOFS); | |
6903 | else | |
6904 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6905 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6906 | } else { |
6907 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6908 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6909 | } |
65b51a00 | 6910 | trans->blocks_used++; |
b4ce94de | 6911 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6912 | return buf; |
6913 | } | |
6914 | ||
f0486c68 YZ |
6915 | static struct btrfs_block_rsv * |
6916 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6917 | struct btrfs_root *root, u32 blocksize) | |
6918 | { | |
6919 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6920 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 | 6921 | int ret; |
d88033db | 6922 | bool global_updated = false; |
f0486c68 YZ |
6923 | |
6924 | block_rsv = get_block_rsv(trans, root); | |
6925 | ||
b586b323 MX |
6926 | if (unlikely(block_rsv->size == 0)) |
6927 | goto try_reserve; | |
d88033db | 6928 | again: |
f0486c68 YZ |
6929 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
6930 | if (!ret) | |
6931 | return block_rsv; | |
6932 | ||
b586b323 MX |
6933 | if (block_rsv->failfast) |
6934 | return ERR_PTR(ret); | |
6935 | ||
d88033db MX |
6936 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
6937 | global_updated = true; | |
6938 | update_global_block_rsv(root->fs_info); | |
6939 | goto again; | |
6940 | } | |
6941 | ||
b586b323 MX |
6942 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6943 | static DEFINE_RATELIMIT_STATE(_rs, | |
6944 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6945 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6946 | if (__ratelimit(&_rs)) | |
6947 | WARN(1, KERN_DEBUG | |
efe120a0 | 6948 | "BTRFS: block rsv returned %d\n", ret); |
b586b323 MX |
6949 | } |
6950 | try_reserve: | |
6951 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
6952 | BTRFS_RESERVE_NO_FLUSH); | |
6953 | if (!ret) | |
6954 | return block_rsv; | |
6955 | /* | |
6956 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
6957 | * the global reserve if its space type is the same as the global |
6958 | * reservation. | |
b586b323 | 6959 | */ |
5881cfc9 MX |
6960 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
6961 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
6962 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
6963 | if (!ret) | |
6964 | return global_rsv; | |
6965 | } | |
6966 | return ERR_PTR(ret); | |
f0486c68 YZ |
6967 | } |
6968 | ||
8c2a3ca2 JB |
6969 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6970 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6971 | { |
6972 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6973 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6974 | } |
6975 | ||
fec577fb | 6976 | /* |
f0486c68 YZ |
6977 | * finds a free extent and does all the dirty work required for allocation |
6978 | * returns the key for the extent through ins, and a tree buffer for | |
6979 | * the first block of the extent through buf. | |
6980 | * | |
fec577fb CM |
6981 | * returns the tree buffer or NULL. |
6982 | */ | |
5f39d397 | 6983 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6984 | struct btrfs_root *root, u32 blocksize, |
6985 | u64 parent, u64 root_objectid, | |
6986 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6987 | u64 hint, u64 empty_size) |
fec577fb | 6988 | { |
e2fa7227 | 6989 | struct btrfs_key ins; |
f0486c68 | 6990 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6991 | struct extent_buffer *buf; |
f0486c68 YZ |
6992 | u64 flags = 0; |
6993 | int ret; | |
3173a18f JB |
6994 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, |
6995 | SKINNY_METADATA); | |
fec577fb | 6996 | |
f0486c68 YZ |
6997 | block_rsv = use_block_rsv(trans, root, blocksize); |
6998 | if (IS_ERR(block_rsv)) | |
6999 | return ERR_CAST(block_rsv); | |
7000 | ||
00361589 | 7001 | ret = btrfs_reserve_extent(root, blocksize, blocksize, |
81c9ad23 | 7002 | empty_size, hint, &ins, 0); |
fec577fb | 7003 | if (ret) { |
8c2a3ca2 | 7004 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 7005 | return ERR_PTR(ret); |
fec577fb | 7006 | } |
55c69072 | 7007 | |
4008c04a CM |
7008 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
7009 | blocksize, level); | |
79787eaa | 7010 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
7011 | |
7012 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
7013 | if (parent == 0) | |
7014 | parent = ins.objectid; | |
7015 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7016 | } else | |
7017 | BUG_ON(parent > 0); | |
7018 | ||
7019 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
7020 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 7021 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 7022 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
7023 | if (key) |
7024 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
7025 | else | |
7026 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
7027 | extent_op->flags_to_set = flags; | |
3173a18f JB |
7028 | if (skinny_metadata) |
7029 | extent_op->update_key = 0; | |
7030 | else | |
7031 | extent_op->update_key = 1; | |
f0486c68 YZ |
7032 | extent_op->update_flags = 1; |
7033 | extent_op->is_data = 0; | |
b1c79e09 | 7034 | extent_op->level = level; |
f0486c68 | 7035 | |
66d7e7f0 AJ |
7036 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
7037 | ins.objectid, | |
f0486c68 YZ |
7038 | ins.offset, parent, root_objectid, |
7039 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 7040 | extent_op, 0); |
79787eaa | 7041 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 7042 | } |
fec577fb CM |
7043 | return buf; |
7044 | } | |
a28ec197 | 7045 | |
2c47e605 YZ |
7046 | struct walk_control { |
7047 | u64 refs[BTRFS_MAX_LEVEL]; | |
7048 | u64 flags[BTRFS_MAX_LEVEL]; | |
7049 | struct btrfs_key update_progress; | |
7050 | int stage; | |
7051 | int level; | |
7052 | int shared_level; | |
7053 | int update_ref; | |
7054 | int keep_locks; | |
1c4850e2 YZ |
7055 | int reada_slot; |
7056 | int reada_count; | |
66d7e7f0 | 7057 | int for_reloc; |
2c47e605 YZ |
7058 | }; |
7059 | ||
7060 | #define DROP_REFERENCE 1 | |
7061 | #define UPDATE_BACKREF 2 | |
7062 | ||
1c4850e2 YZ |
7063 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
7064 | struct btrfs_root *root, | |
7065 | struct walk_control *wc, | |
7066 | struct btrfs_path *path) | |
6407bf6d | 7067 | { |
1c4850e2 YZ |
7068 | u64 bytenr; |
7069 | u64 generation; | |
7070 | u64 refs; | |
94fcca9f | 7071 | u64 flags; |
5d4f98a2 | 7072 | u32 nritems; |
1c4850e2 YZ |
7073 | u32 blocksize; |
7074 | struct btrfs_key key; | |
7075 | struct extent_buffer *eb; | |
6407bf6d | 7076 | int ret; |
1c4850e2 YZ |
7077 | int slot; |
7078 | int nread = 0; | |
6407bf6d | 7079 | |
1c4850e2 YZ |
7080 | if (path->slots[wc->level] < wc->reada_slot) { |
7081 | wc->reada_count = wc->reada_count * 2 / 3; | |
7082 | wc->reada_count = max(wc->reada_count, 2); | |
7083 | } else { | |
7084 | wc->reada_count = wc->reada_count * 3 / 2; | |
7085 | wc->reada_count = min_t(int, wc->reada_count, | |
7086 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
7087 | } | |
7bb86316 | 7088 | |
1c4850e2 YZ |
7089 | eb = path->nodes[wc->level]; |
7090 | nritems = btrfs_header_nritems(eb); | |
7091 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 7092 | |
1c4850e2 YZ |
7093 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
7094 | if (nread >= wc->reada_count) | |
7095 | break; | |
bd56b302 | 7096 | |
2dd3e67b | 7097 | cond_resched(); |
1c4850e2 YZ |
7098 | bytenr = btrfs_node_blockptr(eb, slot); |
7099 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 7100 | |
1c4850e2 YZ |
7101 | if (slot == path->slots[wc->level]) |
7102 | goto reada; | |
5d4f98a2 | 7103 | |
1c4850e2 YZ |
7104 | if (wc->stage == UPDATE_BACKREF && |
7105 | generation <= root->root_key.offset) | |
bd56b302 CM |
7106 | continue; |
7107 | ||
94fcca9f | 7108 | /* We don't lock the tree block, it's OK to be racy here */ |
3173a18f JB |
7109 | ret = btrfs_lookup_extent_info(trans, root, bytenr, |
7110 | wc->level - 1, 1, &refs, | |
7111 | &flags); | |
79787eaa JM |
7112 | /* We don't care about errors in readahead. */ |
7113 | if (ret < 0) | |
7114 | continue; | |
94fcca9f YZ |
7115 | BUG_ON(refs == 0); |
7116 | ||
1c4850e2 | 7117 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
7118 | if (refs == 1) |
7119 | goto reada; | |
bd56b302 | 7120 | |
94fcca9f YZ |
7121 | if (wc->level == 1 && |
7122 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7123 | continue; | |
1c4850e2 YZ |
7124 | if (!wc->update_ref || |
7125 | generation <= root->root_key.offset) | |
7126 | continue; | |
7127 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7128 | ret = btrfs_comp_cpu_keys(&key, | |
7129 | &wc->update_progress); | |
7130 | if (ret < 0) | |
7131 | continue; | |
94fcca9f YZ |
7132 | } else { |
7133 | if (wc->level == 1 && | |
7134 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7135 | continue; | |
6407bf6d | 7136 | } |
1c4850e2 YZ |
7137 | reada: |
7138 | ret = readahead_tree_block(root, bytenr, blocksize, | |
7139 | generation); | |
7140 | if (ret) | |
bd56b302 | 7141 | break; |
1c4850e2 | 7142 | nread++; |
20524f02 | 7143 | } |
1c4850e2 | 7144 | wc->reada_slot = slot; |
20524f02 | 7145 | } |
2c47e605 | 7146 | |
f82d02d9 | 7147 | /* |
2c016dc2 | 7148 | * helper to process tree block while walking down the tree. |
2c47e605 | 7149 | * |
2c47e605 YZ |
7150 | * when wc->stage == UPDATE_BACKREF, this function updates |
7151 | * back refs for pointers in the block. | |
7152 | * | |
7153 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 7154 | */ |
2c47e605 | 7155 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 7156 | struct btrfs_root *root, |
2c47e605 | 7157 | struct btrfs_path *path, |
94fcca9f | 7158 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 7159 | { |
2c47e605 YZ |
7160 | int level = wc->level; |
7161 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 7162 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
7163 | int ret; |
7164 | ||
2c47e605 YZ |
7165 | if (wc->stage == UPDATE_BACKREF && |
7166 | btrfs_header_owner(eb) != root->root_key.objectid) | |
7167 | return 1; | |
f82d02d9 | 7168 | |
2c47e605 YZ |
7169 | /* |
7170 | * when reference count of tree block is 1, it won't increase | |
7171 | * again. once full backref flag is set, we never clear it. | |
7172 | */ | |
94fcca9f YZ |
7173 | if (lookup_info && |
7174 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
7175 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
7176 | BUG_ON(!path->locks[level]); |
7177 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7178 | eb->start, level, 1, |
2c47e605 YZ |
7179 | &wc->refs[level], |
7180 | &wc->flags[level]); | |
79787eaa JM |
7181 | BUG_ON(ret == -ENOMEM); |
7182 | if (ret) | |
7183 | return ret; | |
2c47e605 YZ |
7184 | BUG_ON(wc->refs[level] == 0); |
7185 | } | |
5d4f98a2 | 7186 | |
2c47e605 YZ |
7187 | if (wc->stage == DROP_REFERENCE) { |
7188 | if (wc->refs[level] > 1) | |
7189 | return 1; | |
f82d02d9 | 7190 | |
2c47e605 | 7191 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 7192 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7193 | path->locks[level] = 0; |
7194 | } | |
7195 | return 0; | |
7196 | } | |
f82d02d9 | 7197 | |
2c47e605 YZ |
7198 | /* wc->stage == UPDATE_BACKREF */ |
7199 | if (!(wc->flags[level] & flag)) { | |
7200 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 7201 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 7202 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 7203 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 7204 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 | 7205 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
b1c79e09 JB |
7206 | eb->len, flag, |
7207 | btrfs_header_level(eb), 0); | |
79787eaa | 7208 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7209 | wc->flags[level] |= flag; |
7210 | } | |
7211 | ||
7212 | /* | |
7213 | * the block is shared by multiple trees, so it's not good to | |
7214 | * keep the tree lock | |
7215 | */ | |
7216 | if (path->locks[level] && level > 0) { | |
bd681513 | 7217 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
7218 | path->locks[level] = 0; |
7219 | } | |
7220 | return 0; | |
7221 | } | |
7222 | ||
1c4850e2 | 7223 | /* |
2c016dc2 | 7224 | * helper to process tree block pointer. |
1c4850e2 YZ |
7225 | * |
7226 | * when wc->stage == DROP_REFERENCE, this function checks | |
7227 | * reference count of the block pointed to. if the block | |
7228 | * is shared and we need update back refs for the subtree | |
7229 | * rooted at the block, this function changes wc->stage to | |
7230 | * UPDATE_BACKREF. if the block is shared and there is no | |
7231 | * need to update back, this function drops the reference | |
7232 | * to the block. | |
7233 | * | |
7234 | * NOTE: return value 1 means we should stop walking down. | |
7235 | */ | |
7236 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
7237 | struct btrfs_root *root, | |
7238 | struct btrfs_path *path, | |
94fcca9f | 7239 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
7240 | { |
7241 | u64 bytenr; | |
7242 | u64 generation; | |
7243 | u64 parent; | |
7244 | u32 blocksize; | |
7245 | struct btrfs_key key; | |
7246 | struct extent_buffer *next; | |
7247 | int level = wc->level; | |
7248 | int reada = 0; | |
7249 | int ret = 0; | |
7250 | ||
7251 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
7252 | path->slots[level]); | |
7253 | /* | |
7254 | * if the lower level block was created before the snapshot | |
7255 | * was created, we know there is no need to update back refs | |
7256 | * for the subtree | |
7257 | */ | |
7258 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
7259 | generation <= root->root_key.offset) { |
7260 | *lookup_info = 1; | |
1c4850e2 | 7261 | return 1; |
94fcca9f | 7262 | } |
1c4850e2 YZ |
7263 | |
7264 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
7265 | blocksize = btrfs_level_size(root, level - 1); | |
7266 | ||
7267 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
7268 | if (!next) { | |
7269 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
7270 | if (!next) |
7271 | return -ENOMEM; | |
b2aaaa3b JB |
7272 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
7273 | level - 1); | |
1c4850e2 YZ |
7274 | reada = 1; |
7275 | } | |
7276 | btrfs_tree_lock(next); | |
7277 | btrfs_set_lock_blocking(next); | |
7278 | ||
3173a18f | 7279 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, |
94fcca9f YZ |
7280 | &wc->refs[level - 1], |
7281 | &wc->flags[level - 1]); | |
79787eaa JM |
7282 | if (ret < 0) { |
7283 | btrfs_tree_unlock(next); | |
7284 | return ret; | |
7285 | } | |
7286 | ||
c2cf52eb SK |
7287 | if (unlikely(wc->refs[level - 1] == 0)) { |
7288 | btrfs_err(root->fs_info, "Missing references."); | |
7289 | BUG(); | |
7290 | } | |
94fcca9f | 7291 | *lookup_info = 0; |
1c4850e2 | 7292 | |
94fcca9f | 7293 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 7294 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
7295 | if (level == 1 && |
7296 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7297 | goto skip; | |
7298 | ||
1c4850e2 YZ |
7299 | if (!wc->update_ref || |
7300 | generation <= root->root_key.offset) | |
7301 | goto skip; | |
7302 | ||
7303 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
7304 | path->slots[level]); | |
7305 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
7306 | if (ret < 0) | |
7307 | goto skip; | |
7308 | ||
7309 | wc->stage = UPDATE_BACKREF; | |
7310 | wc->shared_level = level - 1; | |
7311 | } | |
94fcca9f YZ |
7312 | } else { |
7313 | if (level == 1 && | |
7314 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7315 | goto skip; | |
1c4850e2 YZ |
7316 | } |
7317 | ||
b9fab919 | 7318 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
7319 | btrfs_tree_unlock(next); |
7320 | free_extent_buffer(next); | |
7321 | next = NULL; | |
94fcca9f | 7322 | *lookup_info = 1; |
1c4850e2 YZ |
7323 | } |
7324 | ||
7325 | if (!next) { | |
7326 | if (reada && level == 1) | |
7327 | reada_walk_down(trans, root, wc, path); | |
7328 | next = read_tree_block(root, bytenr, blocksize, generation); | |
416bc658 JB |
7329 | if (!next || !extent_buffer_uptodate(next)) { |
7330 | free_extent_buffer(next); | |
97d9a8a4 | 7331 | return -EIO; |
416bc658 | 7332 | } |
1c4850e2 YZ |
7333 | btrfs_tree_lock(next); |
7334 | btrfs_set_lock_blocking(next); | |
7335 | } | |
7336 | ||
7337 | level--; | |
7338 | BUG_ON(level != btrfs_header_level(next)); | |
7339 | path->nodes[level] = next; | |
7340 | path->slots[level] = 0; | |
bd681513 | 7341 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
7342 | wc->level = level; |
7343 | if (wc->level == 1) | |
7344 | wc->reada_slot = 0; | |
7345 | return 0; | |
7346 | skip: | |
7347 | wc->refs[level - 1] = 0; | |
7348 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
7349 | if (wc->stage == DROP_REFERENCE) { |
7350 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
7351 | parent = path->nodes[level]->start; | |
7352 | } else { | |
7353 | BUG_ON(root->root_key.objectid != | |
7354 | btrfs_header_owner(path->nodes[level])); | |
7355 | parent = 0; | |
7356 | } | |
1c4850e2 | 7357 | |
94fcca9f | 7358 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 7359 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 7360 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 7361 | } |
1c4850e2 YZ |
7362 | btrfs_tree_unlock(next); |
7363 | free_extent_buffer(next); | |
94fcca9f | 7364 | *lookup_info = 1; |
1c4850e2 YZ |
7365 | return 1; |
7366 | } | |
7367 | ||
2c47e605 | 7368 | /* |
2c016dc2 | 7369 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
7370 | * |
7371 | * when wc->stage == DROP_REFERENCE, this function drops | |
7372 | * reference count on the block. | |
7373 | * | |
7374 | * when wc->stage == UPDATE_BACKREF, this function changes | |
7375 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
7376 | * to UPDATE_BACKREF previously while processing the block. | |
7377 | * | |
7378 | * NOTE: return value 1 means we should stop walking up. | |
7379 | */ | |
7380 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
7381 | struct btrfs_root *root, | |
7382 | struct btrfs_path *path, | |
7383 | struct walk_control *wc) | |
7384 | { | |
f0486c68 | 7385 | int ret; |
2c47e605 YZ |
7386 | int level = wc->level; |
7387 | struct extent_buffer *eb = path->nodes[level]; | |
7388 | u64 parent = 0; | |
7389 | ||
7390 | if (wc->stage == UPDATE_BACKREF) { | |
7391 | BUG_ON(wc->shared_level < level); | |
7392 | if (level < wc->shared_level) | |
7393 | goto out; | |
7394 | ||
2c47e605 YZ |
7395 | ret = find_next_key(path, level + 1, &wc->update_progress); |
7396 | if (ret > 0) | |
7397 | wc->update_ref = 0; | |
7398 | ||
7399 | wc->stage = DROP_REFERENCE; | |
7400 | wc->shared_level = -1; | |
7401 | path->slots[level] = 0; | |
7402 | ||
7403 | /* | |
7404 | * check reference count again if the block isn't locked. | |
7405 | * we should start walking down the tree again if reference | |
7406 | * count is one. | |
7407 | */ | |
7408 | if (!path->locks[level]) { | |
7409 | BUG_ON(level == 0); | |
7410 | btrfs_tree_lock(eb); | |
7411 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7412 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7413 | |
7414 | ret = btrfs_lookup_extent_info(trans, root, | |
3173a18f | 7415 | eb->start, level, 1, |
2c47e605 YZ |
7416 | &wc->refs[level], |
7417 | &wc->flags[level]); | |
79787eaa JM |
7418 | if (ret < 0) { |
7419 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7420 | path->locks[level] = 0; |
79787eaa JM |
7421 | return ret; |
7422 | } | |
2c47e605 YZ |
7423 | BUG_ON(wc->refs[level] == 0); |
7424 | if (wc->refs[level] == 1) { | |
bd681513 | 7425 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7426 | path->locks[level] = 0; |
2c47e605 YZ |
7427 | return 1; |
7428 | } | |
f82d02d9 | 7429 | } |
2c47e605 | 7430 | } |
f82d02d9 | 7431 | |
2c47e605 YZ |
7432 | /* wc->stage == DROP_REFERENCE */ |
7433 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7434 | |
2c47e605 YZ |
7435 | if (wc->refs[level] == 1) { |
7436 | if (level == 0) { | |
7437 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7438 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7439 | wc->for_reloc); | |
2c47e605 | 7440 | else |
66d7e7f0 AJ |
7441 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7442 | wc->for_reloc); | |
79787eaa | 7443 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7444 | } |
7445 | /* make block locked assertion in clean_tree_block happy */ | |
7446 | if (!path->locks[level] && | |
7447 | btrfs_header_generation(eb) == trans->transid) { | |
7448 | btrfs_tree_lock(eb); | |
7449 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7450 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7451 | } |
7452 | clean_tree_block(trans, root, eb); | |
7453 | } | |
7454 | ||
7455 | if (eb == root->node) { | |
7456 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7457 | parent = eb->start; | |
7458 | else | |
7459 | BUG_ON(root->root_key.objectid != | |
7460 | btrfs_header_owner(eb)); | |
7461 | } else { | |
7462 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7463 | parent = path->nodes[level + 1]->start; | |
7464 | else | |
7465 | BUG_ON(root->root_key.objectid != | |
7466 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7467 | } |
f82d02d9 | 7468 | |
5581a51a | 7469 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7470 | out: |
7471 | wc->refs[level] = 0; | |
7472 | wc->flags[level] = 0; | |
f0486c68 | 7473 | return 0; |
2c47e605 YZ |
7474 | } |
7475 | ||
7476 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7477 | struct btrfs_root *root, | |
7478 | struct btrfs_path *path, | |
7479 | struct walk_control *wc) | |
7480 | { | |
2c47e605 | 7481 | int level = wc->level; |
94fcca9f | 7482 | int lookup_info = 1; |
2c47e605 YZ |
7483 | int ret; |
7484 | ||
7485 | while (level >= 0) { | |
94fcca9f | 7486 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7487 | if (ret > 0) |
7488 | break; | |
7489 | ||
7490 | if (level == 0) | |
7491 | break; | |
7492 | ||
7a7965f8 YZ |
7493 | if (path->slots[level] >= |
7494 | btrfs_header_nritems(path->nodes[level])) | |
7495 | break; | |
7496 | ||
94fcca9f | 7497 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7498 | if (ret > 0) { |
7499 | path->slots[level]++; | |
7500 | continue; | |
90d2c51d MX |
7501 | } else if (ret < 0) |
7502 | return ret; | |
1c4850e2 | 7503 | level = wc->level; |
f82d02d9 | 7504 | } |
f82d02d9 YZ |
7505 | return 0; |
7506 | } | |
7507 | ||
d397712b | 7508 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7509 | struct btrfs_root *root, |
f82d02d9 | 7510 | struct btrfs_path *path, |
2c47e605 | 7511 | struct walk_control *wc, int max_level) |
20524f02 | 7512 | { |
2c47e605 | 7513 | int level = wc->level; |
20524f02 | 7514 | int ret; |
9f3a7427 | 7515 | |
2c47e605 YZ |
7516 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7517 | while (level < max_level && path->nodes[level]) { | |
7518 | wc->level = level; | |
7519 | if (path->slots[level] + 1 < | |
7520 | btrfs_header_nritems(path->nodes[level])) { | |
7521 | path->slots[level]++; | |
20524f02 CM |
7522 | return 0; |
7523 | } else { | |
2c47e605 YZ |
7524 | ret = walk_up_proc(trans, root, path, wc); |
7525 | if (ret > 0) | |
7526 | return 0; | |
bd56b302 | 7527 | |
2c47e605 | 7528 | if (path->locks[level]) { |
bd681513 CM |
7529 | btrfs_tree_unlock_rw(path->nodes[level], |
7530 | path->locks[level]); | |
2c47e605 | 7531 | path->locks[level] = 0; |
f82d02d9 | 7532 | } |
2c47e605 YZ |
7533 | free_extent_buffer(path->nodes[level]); |
7534 | path->nodes[level] = NULL; | |
7535 | level++; | |
20524f02 CM |
7536 | } |
7537 | } | |
7538 | return 1; | |
7539 | } | |
7540 | ||
9aca1d51 | 7541 | /* |
2c47e605 YZ |
7542 | * drop a subvolume tree. |
7543 | * | |
7544 | * this function traverses the tree freeing any blocks that only | |
7545 | * referenced by the tree. | |
7546 | * | |
7547 | * when a shared tree block is found. this function decreases its | |
7548 | * reference count by one. if update_ref is true, this function | |
7549 | * also make sure backrefs for the shared block and all lower level | |
7550 | * blocks are properly updated. | |
9d1a2a3a DS |
7551 | * |
7552 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 7553 | */ |
2c536799 | 7554 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7555 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7556 | int for_reloc) | |
20524f02 | 7557 | { |
5caf2a00 | 7558 | struct btrfs_path *path; |
2c47e605 YZ |
7559 | struct btrfs_trans_handle *trans; |
7560 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7561 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7562 | struct walk_control *wc; |
7563 | struct btrfs_key key; | |
7564 | int err = 0; | |
7565 | int ret; | |
7566 | int level; | |
d29a9f62 | 7567 | bool root_dropped = false; |
20524f02 | 7568 | |
5caf2a00 | 7569 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7570 | if (!path) { |
7571 | err = -ENOMEM; | |
7572 | goto out; | |
7573 | } | |
20524f02 | 7574 | |
2c47e605 | 7575 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7576 | if (!wc) { |
7577 | btrfs_free_path(path); | |
cb1b69f4 TI |
7578 | err = -ENOMEM; |
7579 | goto out; | |
38a1a919 | 7580 | } |
2c47e605 | 7581 | |
a22285a6 | 7582 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7583 | if (IS_ERR(trans)) { |
7584 | err = PTR_ERR(trans); | |
7585 | goto out_free; | |
7586 | } | |
98d5dc13 | 7587 | |
3fd0a558 YZ |
7588 | if (block_rsv) |
7589 | trans->block_rsv = block_rsv; | |
2c47e605 | 7590 | |
9f3a7427 | 7591 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7592 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7593 | path->nodes[level] = btrfs_lock_root_node(root); |
7594 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7595 | path->slots[level] = 0; |
bd681513 | 7596 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7597 | memset(&wc->update_progress, 0, |
7598 | sizeof(wc->update_progress)); | |
9f3a7427 | 7599 | } else { |
9f3a7427 | 7600 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7601 | memcpy(&wc->update_progress, &key, |
7602 | sizeof(wc->update_progress)); | |
7603 | ||
6702ed49 | 7604 | level = root_item->drop_level; |
2c47e605 | 7605 | BUG_ON(level == 0); |
6702ed49 | 7606 | path->lowest_level = level; |
2c47e605 YZ |
7607 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7608 | path->lowest_level = 0; | |
7609 | if (ret < 0) { | |
7610 | err = ret; | |
79787eaa | 7611 | goto out_end_trans; |
9f3a7427 | 7612 | } |
1c4850e2 | 7613 | WARN_ON(ret > 0); |
2c47e605 | 7614 | |
7d9eb12c CM |
7615 | /* |
7616 | * unlock our path, this is safe because only this | |
7617 | * function is allowed to delete this snapshot | |
7618 | */ | |
5d4f98a2 | 7619 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7620 | |
7621 | level = btrfs_header_level(root->node); | |
7622 | while (1) { | |
7623 | btrfs_tree_lock(path->nodes[level]); | |
7624 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 7625 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7626 | |
7627 | ret = btrfs_lookup_extent_info(trans, root, | |
7628 | path->nodes[level]->start, | |
3173a18f | 7629 | level, 1, &wc->refs[level], |
2c47e605 | 7630 | &wc->flags[level]); |
79787eaa JM |
7631 | if (ret < 0) { |
7632 | err = ret; | |
7633 | goto out_end_trans; | |
7634 | } | |
2c47e605 YZ |
7635 | BUG_ON(wc->refs[level] == 0); |
7636 | ||
7637 | if (level == root_item->drop_level) | |
7638 | break; | |
7639 | ||
7640 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 7641 | path->locks[level] = 0; |
2c47e605 YZ |
7642 | WARN_ON(wc->refs[level] != 1); |
7643 | level--; | |
7644 | } | |
9f3a7427 | 7645 | } |
2c47e605 YZ |
7646 | |
7647 | wc->level = level; | |
7648 | wc->shared_level = -1; | |
7649 | wc->stage = DROP_REFERENCE; | |
7650 | wc->update_ref = update_ref; | |
7651 | wc->keep_locks = 0; | |
66d7e7f0 | 7652 | wc->for_reloc = for_reloc; |
1c4850e2 | 7653 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7654 | |
d397712b | 7655 | while (1) { |
9d1a2a3a | 7656 | |
2c47e605 YZ |
7657 | ret = walk_down_tree(trans, root, path, wc); |
7658 | if (ret < 0) { | |
7659 | err = ret; | |
20524f02 | 7660 | break; |
2c47e605 | 7661 | } |
9aca1d51 | 7662 | |
2c47e605 YZ |
7663 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7664 | if (ret < 0) { | |
7665 | err = ret; | |
20524f02 | 7666 | break; |
2c47e605 YZ |
7667 | } |
7668 | ||
7669 | if (ret > 0) { | |
7670 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7671 | break; |
7672 | } | |
2c47e605 YZ |
7673 | |
7674 | if (wc->stage == DROP_REFERENCE) { | |
7675 | level = wc->level; | |
7676 | btrfs_node_key(path->nodes[level], | |
7677 | &root_item->drop_progress, | |
7678 | path->slots[level]); | |
7679 | root_item->drop_level = level; | |
7680 | } | |
7681 | ||
7682 | BUG_ON(wc->level == 0); | |
3c8f2422 JB |
7683 | if (btrfs_should_end_transaction(trans, tree_root) || |
7684 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
2c47e605 YZ |
7685 | ret = btrfs_update_root(trans, tree_root, |
7686 | &root->root_key, | |
7687 | root_item); | |
79787eaa JM |
7688 | if (ret) { |
7689 | btrfs_abort_transaction(trans, tree_root, ret); | |
7690 | err = ret; | |
7691 | goto out_end_trans; | |
7692 | } | |
2c47e605 | 7693 | |
3fd0a558 | 7694 | btrfs_end_transaction_throttle(trans, tree_root); |
3c8f2422 | 7695 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { |
efe120a0 | 7696 | pr_debug("BTRFS: drop snapshot early exit\n"); |
3c8f2422 JB |
7697 | err = -EAGAIN; |
7698 | goto out_free; | |
7699 | } | |
7700 | ||
a22285a6 | 7701 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7702 | if (IS_ERR(trans)) { |
7703 | err = PTR_ERR(trans); | |
7704 | goto out_free; | |
7705 | } | |
3fd0a558 YZ |
7706 | if (block_rsv) |
7707 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7708 | } |
20524f02 | 7709 | } |
b3b4aa74 | 7710 | btrfs_release_path(path); |
79787eaa JM |
7711 | if (err) |
7712 | goto out_end_trans; | |
2c47e605 YZ |
7713 | |
7714 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7715 | if (ret) { |
7716 | btrfs_abort_transaction(trans, tree_root, ret); | |
7717 | goto out_end_trans; | |
7718 | } | |
2c47e605 | 7719 | |
76dda93c | 7720 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
7721 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
7722 | NULL, NULL); | |
79787eaa JM |
7723 | if (ret < 0) { |
7724 | btrfs_abort_transaction(trans, tree_root, ret); | |
7725 | err = ret; | |
7726 | goto out_end_trans; | |
7727 | } else if (ret > 0) { | |
84cd948c JB |
7728 | /* if we fail to delete the orphan item this time |
7729 | * around, it'll get picked up the next time. | |
7730 | * | |
7731 | * The most common failure here is just -ENOENT. | |
7732 | */ | |
7733 | btrfs_del_orphan_item(trans, tree_root, | |
7734 | root->root_key.objectid); | |
76dda93c YZ |
7735 | } |
7736 | } | |
7737 | ||
7738 | if (root->in_radix) { | |
cb517eab | 7739 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); |
76dda93c YZ |
7740 | } else { |
7741 | free_extent_buffer(root->node); | |
7742 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 7743 | btrfs_put_fs_root(root); |
76dda93c | 7744 | } |
d29a9f62 | 7745 | root_dropped = true; |
79787eaa | 7746 | out_end_trans: |
3fd0a558 | 7747 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7748 | out_free: |
2c47e605 | 7749 | kfree(wc); |
5caf2a00 | 7750 | btrfs_free_path(path); |
cb1b69f4 | 7751 | out: |
d29a9f62 JB |
7752 | /* |
7753 | * So if we need to stop dropping the snapshot for whatever reason we | |
7754 | * need to make sure to add it back to the dead root list so that we | |
7755 | * keep trying to do the work later. This also cleans up roots if we | |
7756 | * don't have it in the radix (like when we recover after a power fail | |
7757 | * or unmount) so we don't leak memory. | |
7758 | */ | |
b37b39cd | 7759 | if (!for_reloc && root_dropped == false) |
d29a9f62 | 7760 | btrfs_add_dead_root(root); |
90515e7f | 7761 | if (err && err != -EAGAIN) |
cb1b69f4 | 7762 | btrfs_std_error(root->fs_info, err); |
2c536799 | 7763 | return err; |
20524f02 | 7764 | } |
9078a3e1 | 7765 | |
2c47e605 YZ |
7766 | /* |
7767 | * drop subtree rooted at tree block 'node'. | |
7768 | * | |
7769 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7770 | * only used by relocation code |
2c47e605 | 7771 | */ |
f82d02d9 YZ |
7772 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7773 | struct btrfs_root *root, | |
7774 | struct extent_buffer *node, | |
7775 | struct extent_buffer *parent) | |
7776 | { | |
7777 | struct btrfs_path *path; | |
2c47e605 | 7778 | struct walk_control *wc; |
f82d02d9 YZ |
7779 | int level; |
7780 | int parent_level; | |
7781 | int ret = 0; | |
7782 | int wret; | |
7783 | ||
2c47e605 YZ |
7784 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7785 | ||
f82d02d9 | 7786 | path = btrfs_alloc_path(); |
db5b493a TI |
7787 | if (!path) |
7788 | return -ENOMEM; | |
f82d02d9 | 7789 | |
2c47e605 | 7790 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7791 | if (!wc) { |
7792 | btrfs_free_path(path); | |
7793 | return -ENOMEM; | |
7794 | } | |
2c47e605 | 7795 | |
b9447ef8 | 7796 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7797 | parent_level = btrfs_header_level(parent); |
7798 | extent_buffer_get(parent); | |
7799 | path->nodes[parent_level] = parent; | |
7800 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7801 | ||
b9447ef8 | 7802 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7803 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7804 | path->nodes[level] = node; |
7805 | path->slots[level] = 0; | |
bd681513 | 7806 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7807 | |
7808 | wc->refs[parent_level] = 1; | |
7809 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7810 | wc->level = level; | |
7811 | wc->shared_level = -1; | |
7812 | wc->stage = DROP_REFERENCE; | |
7813 | wc->update_ref = 0; | |
7814 | wc->keep_locks = 1; | |
66d7e7f0 | 7815 | wc->for_reloc = 1; |
1c4850e2 | 7816 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7817 | |
7818 | while (1) { | |
2c47e605 YZ |
7819 | wret = walk_down_tree(trans, root, path, wc); |
7820 | if (wret < 0) { | |
f82d02d9 | 7821 | ret = wret; |
f82d02d9 | 7822 | break; |
2c47e605 | 7823 | } |
f82d02d9 | 7824 | |
2c47e605 | 7825 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7826 | if (wret < 0) |
7827 | ret = wret; | |
7828 | if (wret != 0) | |
7829 | break; | |
7830 | } | |
7831 | ||
2c47e605 | 7832 | kfree(wc); |
f82d02d9 YZ |
7833 | btrfs_free_path(path); |
7834 | return ret; | |
7835 | } | |
7836 | ||
ec44a35c CM |
7837 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7838 | { | |
7839 | u64 num_devices; | |
fc67c450 | 7840 | u64 stripped; |
e4d8ec0f | 7841 | |
fc67c450 ID |
7842 | /* |
7843 | * if restripe for this chunk_type is on pick target profile and | |
7844 | * return, otherwise do the usual balance | |
7845 | */ | |
7846 | stripped = get_restripe_target(root->fs_info, flags); | |
7847 | if (stripped) | |
7848 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7849 | |
cd02dca5 CM |
7850 | /* |
7851 | * we add in the count of missing devices because we want | |
7852 | * to make sure that any RAID levels on a degraded FS | |
7853 | * continue to be honored. | |
7854 | */ | |
7855 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7856 | root->fs_info->fs_devices->missing_devices; | |
7857 | ||
fc67c450 | 7858 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7859 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7860 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7861 | ||
ec44a35c CM |
7862 | if (num_devices == 1) { |
7863 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7864 | stripped = flags & ~stripped; | |
7865 | ||
7866 | /* turn raid0 into single device chunks */ | |
7867 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7868 | return stripped; | |
7869 | ||
7870 | /* turn mirroring into duplication */ | |
7871 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7872 | BTRFS_BLOCK_GROUP_RAID10)) | |
7873 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7874 | } else { |
7875 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7876 | if (flags & stripped) |
7877 | return flags; | |
7878 | ||
7879 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7880 | stripped = flags & ~stripped; | |
7881 | ||
7882 | /* switch duplicated blocks with raid1 */ | |
7883 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7884 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7885 | ||
e3176ca2 | 7886 | /* this is drive concat, leave it alone */ |
ec44a35c | 7887 | } |
e3176ca2 | 7888 | |
ec44a35c CM |
7889 | return flags; |
7890 | } | |
7891 | ||
199c36ea | 7892 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7893 | { |
f0486c68 YZ |
7894 | struct btrfs_space_info *sinfo = cache->space_info; |
7895 | u64 num_bytes; | |
199c36ea | 7896 | u64 min_allocable_bytes; |
f0486c68 | 7897 | int ret = -ENOSPC; |
0ef3e66b | 7898 | |
c286ac48 | 7899 | |
199c36ea MX |
7900 | /* |
7901 | * We need some metadata space and system metadata space for | |
7902 | * allocating chunks in some corner cases until we force to set | |
7903 | * it to be readonly. | |
7904 | */ | |
7905 | if ((sinfo->flags & | |
7906 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7907 | !force) | |
7908 | min_allocable_bytes = 1 * 1024 * 1024; | |
7909 | else | |
7910 | min_allocable_bytes = 0; | |
7911 | ||
f0486c68 YZ |
7912 | spin_lock(&sinfo->lock); |
7913 | spin_lock(&cache->lock); | |
61cfea9b W |
7914 | |
7915 | if (cache->ro) { | |
7916 | ret = 0; | |
7917 | goto out; | |
7918 | } | |
7919 | ||
f0486c68 YZ |
7920 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7921 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7922 | ||
7923 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7924 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7925 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7926 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7927 | cache->ro = 1; |
7928 | ret = 0; | |
7929 | } | |
61cfea9b | 7930 | out: |
f0486c68 YZ |
7931 | spin_unlock(&cache->lock); |
7932 | spin_unlock(&sinfo->lock); | |
7933 | return ret; | |
7934 | } | |
7d9eb12c | 7935 | |
f0486c68 YZ |
7936 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7937 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7938 | |
f0486c68 YZ |
7939 | { |
7940 | struct btrfs_trans_handle *trans; | |
7941 | u64 alloc_flags; | |
7942 | int ret; | |
7d9eb12c | 7943 | |
f0486c68 | 7944 | BUG_ON(cache->ro); |
0ef3e66b | 7945 | |
ff5714cc | 7946 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7947 | if (IS_ERR(trans)) |
7948 | return PTR_ERR(trans); | |
5d4f98a2 | 7949 | |
f0486c68 | 7950 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7951 | if (alloc_flags != cache->flags) { |
698d0082 | 7952 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7953 | CHUNK_ALLOC_FORCE); |
7954 | if (ret < 0) | |
7955 | goto out; | |
7956 | } | |
5d4f98a2 | 7957 | |
199c36ea | 7958 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7959 | if (!ret) |
7960 | goto out; | |
7961 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7962 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7963 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7964 | if (ret < 0) |
7965 | goto out; | |
199c36ea | 7966 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7967 | out: |
7968 | btrfs_end_transaction(trans, root); | |
7969 | return ret; | |
7970 | } | |
5d4f98a2 | 7971 | |
c87f08ca CM |
7972 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7973 | struct btrfs_root *root, u64 type) | |
7974 | { | |
7975 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7976 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7977 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7978 | } |
7979 | ||
6d07bcec MX |
7980 | /* |
7981 | * helper to account the unused space of all the readonly block group in the | |
7982 | * list. takes mirrors into account. | |
7983 | */ | |
7984 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7985 | { | |
7986 | struct btrfs_block_group_cache *block_group; | |
7987 | u64 free_bytes = 0; | |
7988 | int factor; | |
7989 | ||
7990 | list_for_each_entry(block_group, groups_list, list) { | |
7991 | spin_lock(&block_group->lock); | |
7992 | ||
7993 | if (!block_group->ro) { | |
7994 | spin_unlock(&block_group->lock); | |
7995 | continue; | |
7996 | } | |
7997 | ||
7998 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7999 | BTRFS_BLOCK_GROUP_RAID10 | | |
8000 | BTRFS_BLOCK_GROUP_DUP)) | |
8001 | factor = 2; | |
8002 | else | |
8003 | factor = 1; | |
8004 | ||
8005 | free_bytes += (block_group->key.offset - | |
8006 | btrfs_block_group_used(&block_group->item)) * | |
8007 | factor; | |
8008 | ||
8009 | spin_unlock(&block_group->lock); | |
8010 | } | |
8011 | ||
8012 | return free_bytes; | |
8013 | } | |
8014 | ||
8015 | /* | |
8016 | * helper to account the unused space of all the readonly block group in the | |
8017 | * space_info. takes mirrors into account. | |
8018 | */ | |
8019 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
8020 | { | |
8021 | int i; | |
8022 | u64 free_bytes = 0; | |
8023 | ||
8024 | spin_lock(&sinfo->lock); | |
8025 | ||
67871254 | 8026 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
6d07bcec MX |
8027 | if (!list_empty(&sinfo->block_groups[i])) |
8028 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
8029 | &sinfo->block_groups[i]); | |
8030 | ||
8031 | spin_unlock(&sinfo->lock); | |
8032 | ||
8033 | return free_bytes; | |
8034 | } | |
8035 | ||
143bede5 | 8036 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 8037 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 8038 | { |
f0486c68 YZ |
8039 | struct btrfs_space_info *sinfo = cache->space_info; |
8040 | u64 num_bytes; | |
8041 | ||
8042 | BUG_ON(!cache->ro); | |
8043 | ||
8044 | spin_lock(&sinfo->lock); | |
8045 | spin_lock(&cache->lock); | |
8046 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8047 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8048 | sinfo->bytes_readonly -= num_bytes; | |
8049 | cache->ro = 0; | |
8050 | spin_unlock(&cache->lock); | |
8051 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
8052 | } |
8053 | ||
ba1bf481 JB |
8054 | /* |
8055 | * checks to see if its even possible to relocate this block group. | |
8056 | * | |
8057 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
8058 | * ok to go ahead and try. | |
8059 | */ | |
8060 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 8061 | { |
ba1bf481 JB |
8062 | struct btrfs_block_group_cache *block_group; |
8063 | struct btrfs_space_info *space_info; | |
8064 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8065 | struct btrfs_device *device; | |
6df9a95e | 8066 | struct btrfs_trans_handle *trans; |
cdcb725c | 8067 | u64 min_free; |
6719db6a JB |
8068 | u64 dev_min = 1; |
8069 | u64 dev_nr = 0; | |
4a5e98f5 | 8070 | u64 target; |
cdcb725c | 8071 | int index; |
ba1bf481 JB |
8072 | int full = 0; |
8073 | int ret = 0; | |
1a40e23b | 8074 | |
ba1bf481 | 8075 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 8076 | |
ba1bf481 JB |
8077 | /* odd, couldn't find the block group, leave it alone */ |
8078 | if (!block_group) | |
8079 | return -1; | |
1a40e23b | 8080 | |
cdcb725c | 8081 | min_free = btrfs_block_group_used(&block_group->item); |
8082 | ||
ba1bf481 | 8083 | /* no bytes used, we're good */ |
cdcb725c | 8084 | if (!min_free) |
1a40e23b ZY |
8085 | goto out; |
8086 | ||
ba1bf481 JB |
8087 | space_info = block_group->space_info; |
8088 | spin_lock(&space_info->lock); | |
17d217fe | 8089 | |
ba1bf481 | 8090 | full = space_info->full; |
17d217fe | 8091 | |
ba1bf481 JB |
8092 | /* |
8093 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
8094 | * relocate it unless we're able to allocate a new chunk below. |
8095 | * | |
8096 | * Otherwise, we need to make sure we have room in the space to handle | |
8097 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 8098 | */ |
7ce618db | 8099 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 8100 | (space_info->bytes_used + space_info->bytes_reserved + |
8101 | space_info->bytes_pinned + space_info->bytes_readonly + | |
8102 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
8103 | spin_unlock(&space_info->lock); |
8104 | goto out; | |
17d217fe | 8105 | } |
ba1bf481 | 8106 | spin_unlock(&space_info->lock); |
ea8c2819 | 8107 | |
ba1bf481 JB |
8108 | /* |
8109 | * ok we don't have enough space, but maybe we have free space on our | |
8110 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
8111 | * alloc devices and guess if we have enough space. if this block |
8112 | * group is going to be restriped, run checks against the target | |
8113 | * profile instead of the current one. | |
ba1bf481 JB |
8114 | */ |
8115 | ret = -1; | |
ea8c2819 | 8116 | |
cdcb725c | 8117 | /* |
8118 | * index: | |
8119 | * 0: raid10 | |
8120 | * 1: raid1 | |
8121 | * 2: dup | |
8122 | * 3: raid0 | |
8123 | * 4: single | |
8124 | */ | |
4a5e98f5 ID |
8125 | target = get_restripe_target(root->fs_info, block_group->flags); |
8126 | if (target) { | |
31e50229 | 8127 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
8128 | } else { |
8129 | /* | |
8130 | * this is just a balance, so if we were marked as full | |
8131 | * we know there is no space for a new chunk | |
8132 | */ | |
8133 | if (full) | |
8134 | goto out; | |
8135 | ||
8136 | index = get_block_group_index(block_group); | |
8137 | } | |
8138 | ||
e6ec716f | 8139 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 8140 | dev_min = 4; |
6719db6a JB |
8141 | /* Divide by 2 */ |
8142 | min_free >>= 1; | |
e6ec716f | 8143 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 8144 | dev_min = 2; |
e6ec716f | 8145 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
8146 | /* Multiply by 2 */ |
8147 | min_free <<= 1; | |
e6ec716f | 8148 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 8149 | dev_min = fs_devices->rw_devices; |
6719db6a | 8150 | do_div(min_free, dev_min); |
cdcb725c | 8151 | } |
8152 | ||
6df9a95e JB |
8153 | /* We need to do this so that we can look at pending chunks */ |
8154 | trans = btrfs_join_transaction(root); | |
8155 | if (IS_ERR(trans)) { | |
8156 | ret = PTR_ERR(trans); | |
8157 | goto out; | |
8158 | } | |
8159 | ||
ba1bf481 JB |
8160 | mutex_lock(&root->fs_info->chunk_mutex); |
8161 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 8162 | u64 dev_offset; |
56bec294 | 8163 | |
ba1bf481 JB |
8164 | /* |
8165 | * check to make sure we can actually find a chunk with enough | |
8166 | * space to fit our block group in. | |
8167 | */ | |
63a212ab SB |
8168 | if (device->total_bytes > device->bytes_used + min_free && |
8169 | !device->is_tgtdev_for_dev_replace) { | |
6df9a95e | 8170 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 8171 | &dev_offset, NULL); |
ba1bf481 | 8172 | if (!ret) |
cdcb725c | 8173 | dev_nr++; |
8174 | ||
8175 | if (dev_nr >= dev_min) | |
73e48b27 | 8176 | break; |
cdcb725c | 8177 | |
ba1bf481 | 8178 | ret = -1; |
725c8463 | 8179 | } |
edbd8d4e | 8180 | } |
ba1bf481 | 8181 | mutex_unlock(&root->fs_info->chunk_mutex); |
6df9a95e | 8182 | btrfs_end_transaction(trans, root); |
edbd8d4e | 8183 | out: |
ba1bf481 | 8184 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
8185 | return ret; |
8186 | } | |
8187 | ||
b2950863 CH |
8188 | static int find_first_block_group(struct btrfs_root *root, |
8189 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 8190 | { |
925baedd | 8191 | int ret = 0; |
0b86a832 CM |
8192 | struct btrfs_key found_key; |
8193 | struct extent_buffer *leaf; | |
8194 | int slot; | |
edbd8d4e | 8195 | |
0b86a832 CM |
8196 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
8197 | if (ret < 0) | |
925baedd CM |
8198 | goto out; |
8199 | ||
d397712b | 8200 | while (1) { |
0b86a832 | 8201 | slot = path->slots[0]; |
edbd8d4e | 8202 | leaf = path->nodes[0]; |
0b86a832 CM |
8203 | if (slot >= btrfs_header_nritems(leaf)) { |
8204 | ret = btrfs_next_leaf(root, path); | |
8205 | if (ret == 0) | |
8206 | continue; | |
8207 | if (ret < 0) | |
925baedd | 8208 | goto out; |
0b86a832 | 8209 | break; |
edbd8d4e | 8210 | } |
0b86a832 | 8211 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 8212 | |
0b86a832 | 8213 | if (found_key.objectid >= key->objectid && |
925baedd CM |
8214 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
8215 | ret = 0; | |
8216 | goto out; | |
8217 | } | |
0b86a832 | 8218 | path->slots[0]++; |
edbd8d4e | 8219 | } |
925baedd | 8220 | out: |
0b86a832 | 8221 | return ret; |
edbd8d4e CM |
8222 | } |
8223 | ||
0af3d00b JB |
8224 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
8225 | { | |
8226 | struct btrfs_block_group_cache *block_group; | |
8227 | u64 last = 0; | |
8228 | ||
8229 | while (1) { | |
8230 | struct inode *inode; | |
8231 | ||
8232 | block_group = btrfs_lookup_first_block_group(info, last); | |
8233 | while (block_group) { | |
8234 | spin_lock(&block_group->lock); | |
8235 | if (block_group->iref) | |
8236 | break; | |
8237 | spin_unlock(&block_group->lock); | |
8238 | block_group = next_block_group(info->tree_root, | |
8239 | block_group); | |
8240 | } | |
8241 | if (!block_group) { | |
8242 | if (last == 0) | |
8243 | break; | |
8244 | last = 0; | |
8245 | continue; | |
8246 | } | |
8247 | ||
8248 | inode = block_group->inode; | |
8249 | block_group->iref = 0; | |
8250 | block_group->inode = NULL; | |
8251 | spin_unlock(&block_group->lock); | |
8252 | iput(inode); | |
8253 | last = block_group->key.objectid + block_group->key.offset; | |
8254 | btrfs_put_block_group(block_group); | |
8255 | } | |
8256 | } | |
8257 | ||
1a40e23b ZY |
8258 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
8259 | { | |
8260 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 8261 | struct btrfs_space_info *space_info; |
11833d66 | 8262 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
8263 | struct rb_node *n; |
8264 | ||
9e351cc8 | 8265 | down_write(&info->commit_root_sem); |
11833d66 YZ |
8266 | while (!list_empty(&info->caching_block_groups)) { |
8267 | caching_ctl = list_entry(info->caching_block_groups.next, | |
8268 | struct btrfs_caching_control, list); | |
8269 | list_del(&caching_ctl->list); | |
8270 | put_caching_control(caching_ctl); | |
8271 | } | |
9e351cc8 | 8272 | up_write(&info->commit_root_sem); |
11833d66 | 8273 | |
1a40e23b ZY |
8274 | spin_lock(&info->block_group_cache_lock); |
8275 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
8276 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
8277 | cache_node); | |
1a40e23b ZY |
8278 | rb_erase(&block_group->cache_node, |
8279 | &info->block_group_cache_tree); | |
d899e052 YZ |
8280 | spin_unlock(&info->block_group_cache_lock); |
8281 | ||
80eb234a | 8282 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 8283 | list_del(&block_group->list); |
80eb234a | 8284 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 8285 | |
817d52f8 | 8286 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8287 | wait_block_group_cache_done(block_group); |
817d52f8 | 8288 | |
3c14874a JB |
8289 | /* |
8290 | * We haven't cached this block group, which means we could | |
8291 | * possibly have excluded extents on this block group. | |
8292 | */ | |
36cce922 JB |
8293 | if (block_group->cached == BTRFS_CACHE_NO || |
8294 | block_group->cached == BTRFS_CACHE_ERROR) | |
3c14874a JB |
8295 | free_excluded_extents(info->extent_root, block_group); |
8296 | ||
817d52f8 | 8297 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 8298 | btrfs_put_block_group(block_group); |
d899e052 YZ |
8299 | |
8300 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
8301 | } |
8302 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
8303 | |
8304 | /* now that all the block groups are freed, go through and | |
8305 | * free all the space_info structs. This is only called during | |
8306 | * the final stages of unmount, and so we know nobody is | |
8307 | * using them. We call synchronize_rcu() once before we start, | |
8308 | * just to be on the safe side. | |
8309 | */ | |
8310 | synchronize_rcu(); | |
8311 | ||
8929ecfa YZ |
8312 | release_global_block_rsv(info); |
8313 | ||
67871254 | 8314 | while (!list_empty(&info->space_info)) { |
6ab0a202 JM |
8315 | int i; |
8316 | ||
4184ea7f CM |
8317 | space_info = list_entry(info->space_info.next, |
8318 | struct btrfs_space_info, | |
8319 | list); | |
b069e0c3 | 8320 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
fae7f21c | 8321 | if (WARN_ON(space_info->bytes_pinned > 0 || |
b069e0c3 | 8322 | space_info->bytes_reserved > 0 || |
fae7f21c | 8323 | space_info->bytes_may_use > 0)) { |
b069e0c3 DS |
8324 | dump_space_info(space_info, 0, 0); |
8325 | } | |
f0486c68 | 8326 | } |
4184ea7f | 8327 | list_del(&space_info->list); |
6ab0a202 JM |
8328 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
8329 | struct kobject *kobj; | |
8330 | kobj = &space_info->block_group_kobjs[i]; | |
8331 | if (kobj->parent) { | |
8332 | kobject_del(kobj); | |
8333 | kobject_put(kobj); | |
8334 | } | |
8335 | } | |
8336 | kobject_del(&space_info->kobj); | |
8337 | kobject_put(&space_info->kobj); | |
4184ea7f | 8338 | } |
1a40e23b ZY |
8339 | return 0; |
8340 | } | |
8341 | ||
b742bb82 YZ |
8342 | static void __link_block_group(struct btrfs_space_info *space_info, |
8343 | struct btrfs_block_group_cache *cache) | |
8344 | { | |
8345 | int index = get_block_group_index(cache); | |
ed55b6ac | 8346 | bool first = false; |
b742bb82 YZ |
8347 | |
8348 | down_write(&space_info->groups_sem); | |
ed55b6ac JM |
8349 | if (list_empty(&space_info->block_groups[index])) |
8350 | first = true; | |
8351 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
8352 | up_write(&space_info->groups_sem); | |
8353 | ||
8354 | if (first) { | |
6ab0a202 JM |
8355 | struct kobject *kobj = &space_info->block_group_kobjs[index]; |
8356 | int ret; | |
8357 | ||
8358 | kobject_get(&space_info->kobj); /* put in release */ | |
536cd964 MX |
8359 | ret = kobject_add(kobj, &space_info->kobj, "%s", |
8360 | get_raid_name(index)); | |
6ab0a202 | 8361 | if (ret) { |
efe120a0 | 8362 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); |
6ab0a202 JM |
8363 | kobject_put(&space_info->kobj); |
8364 | } | |
8365 | } | |
b742bb82 YZ |
8366 | } |
8367 | ||
920e4a58 MX |
8368 | static struct btrfs_block_group_cache * |
8369 | btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) | |
8370 | { | |
8371 | struct btrfs_block_group_cache *cache; | |
8372 | ||
8373 | cache = kzalloc(sizeof(*cache), GFP_NOFS); | |
8374 | if (!cache) | |
8375 | return NULL; | |
8376 | ||
8377 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), | |
8378 | GFP_NOFS); | |
8379 | if (!cache->free_space_ctl) { | |
8380 | kfree(cache); | |
8381 | return NULL; | |
8382 | } | |
8383 | ||
8384 | cache->key.objectid = start; | |
8385 | cache->key.offset = size; | |
8386 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
8387 | ||
8388 | cache->sectorsize = root->sectorsize; | |
8389 | cache->fs_info = root->fs_info; | |
8390 | cache->full_stripe_len = btrfs_full_stripe_len(root, | |
8391 | &root->fs_info->mapping_tree, | |
8392 | start); | |
8393 | atomic_set(&cache->count, 1); | |
8394 | spin_lock_init(&cache->lock); | |
8395 | INIT_LIST_HEAD(&cache->list); | |
8396 | INIT_LIST_HEAD(&cache->cluster_list); | |
8397 | INIT_LIST_HEAD(&cache->new_bg_list); | |
8398 | btrfs_init_free_space_ctl(cache); | |
8399 | ||
8400 | return cache; | |
8401 | } | |
8402 | ||
9078a3e1 CM |
8403 | int btrfs_read_block_groups(struct btrfs_root *root) |
8404 | { | |
8405 | struct btrfs_path *path; | |
8406 | int ret; | |
9078a3e1 | 8407 | struct btrfs_block_group_cache *cache; |
be744175 | 8408 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 8409 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
8410 | struct btrfs_key key; |
8411 | struct btrfs_key found_key; | |
5f39d397 | 8412 | struct extent_buffer *leaf; |
0af3d00b JB |
8413 | int need_clear = 0; |
8414 | u64 cache_gen; | |
96b5179d | 8415 | |
be744175 | 8416 | root = info->extent_root; |
9078a3e1 | 8417 | key.objectid = 0; |
0b86a832 | 8418 | key.offset = 0; |
9078a3e1 | 8419 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
8420 | path = btrfs_alloc_path(); |
8421 | if (!path) | |
8422 | return -ENOMEM; | |
026fd317 | 8423 | path->reada = 1; |
9078a3e1 | 8424 | |
6c41761f | 8425 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 8426 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 8427 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 8428 | need_clear = 1; |
88c2ba3b JB |
8429 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
8430 | need_clear = 1; | |
0af3d00b | 8431 | |
d397712b | 8432 | while (1) { |
0b86a832 | 8433 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
8434 | if (ret > 0) |
8435 | break; | |
0b86a832 CM |
8436 | if (ret != 0) |
8437 | goto error; | |
920e4a58 | 8438 | |
5f39d397 CM |
8439 | leaf = path->nodes[0]; |
8440 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
920e4a58 MX |
8441 | |
8442 | cache = btrfs_create_block_group_cache(root, found_key.objectid, | |
8443 | found_key.offset); | |
9078a3e1 | 8444 | if (!cache) { |
0b86a832 | 8445 | ret = -ENOMEM; |
f0486c68 | 8446 | goto error; |
9078a3e1 | 8447 | } |
96303081 | 8448 | |
cf7c1ef6 LB |
8449 | if (need_clear) { |
8450 | /* | |
8451 | * When we mount with old space cache, we need to | |
8452 | * set BTRFS_DC_CLEAR and set dirty flag. | |
8453 | * | |
8454 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
8455 | * truncate the old free space cache inode and | |
8456 | * setup a new one. | |
8457 | * b) Setting 'dirty flag' makes sure that we flush | |
8458 | * the new space cache info onto disk. | |
8459 | */ | |
0af3d00b | 8460 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
8461 | if (btrfs_test_opt(root, SPACE_CACHE)) |
8462 | cache->dirty = 1; | |
8463 | } | |
0af3d00b | 8464 | |
5f39d397 CM |
8465 | read_extent_buffer(leaf, &cache->item, |
8466 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
8467 | sizeof(cache->item)); | |
920e4a58 | 8468 | cache->flags = btrfs_block_group_flags(&cache->item); |
0b86a832 | 8469 | |
9078a3e1 | 8470 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 8471 | btrfs_release_path(path); |
34d52cb6 | 8472 | |
3c14874a JB |
8473 | /* |
8474 | * We need to exclude the super stripes now so that the space | |
8475 | * info has super bytes accounted for, otherwise we'll think | |
8476 | * we have more space than we actually do. | |
8477 | */ | |
835d974f JB |
8478 | ret = exclude_super_stripes(root, cache); |
8479 | if (ret) { | |
8480 | /* | |
8481 | * We may have excluded something, so call this just in | |
8482 | * case. | |
8483 | */ | |
8484 | free_excluded_extents(root, cache); | |
920e4a58 | 8485 | btrfs_put_block_group(cache); |
835d974f JB |
8486 | goto error; |
8487 | } | |
3c14874a | 8488 | |
817d52f8 JB |
8489 | /* |
8490 | * check for two cases, either we are full, and therefore | |
8491 | * don't need to bother with the caching work since we won't | |
8492 | * find any space, or we are empty, and we can just add all | |
8493 | * the space in and be done with it. This saves us _alot_ of | |
8494 | * time, particularly in the full case. | |
8495 | */ | |
8496 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8497 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8498 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8499 | free_excluded_extents(root, cache); |
817d52f8 | 8500 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8501 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8502 | cache->cached = BTRFS_CACHE_FINISHED; |
8503 | add_new_free_space(cache, root->fs_info, | |
8504 | found_key.objectid, | |
8505 | found_key.objectid + | |
8506 | found_key.offset); | |
11833d66 | 8507 | free_excluded_extents(root, cache); |
817d52f8 | 8508 | } |
96b5179d | 8509 | |
8c579fe7 JB |
8510 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8511 | if (ret) { | |
8512 | btrfs_remove_free_space_cache(cache); | |
8513 | btrfs_put_block_group(cache); | |
8514 | goto error; | |
8515 | } | |
8516 | ||
6324fbf3 CM |
8517 | ret = update_space_info(info, cache->flags, found_key.offset, |
8518 | btrfs_block_group_used(&cache->item), | |
8519 | &space_info); | |
8c579fe7 JB |
8520 | if (ret) { |
8521 | btrfs_remove_free_space_cache(cache); | |
8522 | spin_lock(&info->block_group_cache_lock); | |
8523 | rb_erase(&cache->cache_node, | |
8524 | &info->block_group_cache_tree); | |
8525 | spin_unlock(&info->block_group_cache_lock); | |
8526 | btrfs_put_block_group(cache); | |
8527 | goto error; | |
8528 | } | |
8529 | ||
6324fbf3 | 8530 | cache->space_info = space_info; |
1b2da372 | 8531 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8532 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8533 | spin_unlock(&cache->space_info->lock); |
8534 | ||
b742bb82 | 8535 | __link_block_group(space_info, cache); |
0f9dd46c | 8536 | |
75ccf47d | 8537 | set_avail_alloc_bits(root->fs_info, cache->flags); |
2b82032c | 8538 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8539 | set_block_group_ro(cache, 1); |
9078a3e1 | 8540 | } |
b742bb82 YZ |
8541 | |
8542 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8543 | if (!(get_alloc_profile(root, space_info->flags) & | |
8544 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8545 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8546 | BTRFS_BLOCK_GROUP_RAID5 | |
8547 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8548 | BTRFS_BLOCK_GROUP_DUP))) |
8549 | continue; | |
8550 | /* | |
8551 | * avoid allocating from un-mirrored block group if there are | |
8552 | * mirrored block groups. | |
8553 | */ | |
1095cc0d | 8554 | list_for_each_entry(cache, |
8555 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
8556 | list) | |
199c36ea | 8557 | set_block_group_ro(cache, 1); |
1095cc0d | 8558 | list_for_each_entry(cache, |
8559 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
8560 | list) | |
199c36ea | 8561 | set_block_group_ro(cache, 1); |
9078a3e1 | 8562 | } |
f0486c68 YZ |
8563 | |
8564 | init_global_block_rsv(info); | |
0b86a832 CM |
8565 | ret = 0; |
8566 | error: | |
9078a3e1 | 8567 | btrfs_free_path(path); |
0b86a832 | 8568 | return ret; |
9078a3e1 | 8569 | } |
6324fbf3 | 8570 | |
ea658bad JB |
8571 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8572 | struct btrfs_root *root) | |
8573 | { | |
8574 | struct btrfs_block_group_cache *block_group, *tmp; | |
8575 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8576 | struct btrfs_block_group_item item; | |
8577 | struct btrfs_key key; | |
8578 | int ret = 0; | |
8579 | ||
8580 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8581 | new_bg_list) { | |
8582 | list_del_init(&block_group->new_bg_list); | |
8583 | ||
8584 | if (ret) | |
8585 | continue; | |
8586 | ||
8587 | spin_lock(&block_group->lock); | |
8588 | memcpy(&item, &block_group->item, sizeof(item)); | |
8589 | memcpy(&key, &block_group->key, sizeof(key)); | |
8590 | spin_unlock(&block_group->lock); | |
8591 | ||
8592 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8593 | sizeof(item)); | |
8594 | if (ret) | |
8595 | btrfs_abort_transaction(trans, extent_root, ret); | |
6df9a95e JB |
8596 | ret = btrfs_finish_chunk_alloc(trans, extent_root, |
8597 | key.objectid, key.offset); | |
8598 | if (ret) | |
8599 | btrfs_abort_transaction(trans, extent_root, ret); | |
ea658bad JB |
8600 | } |
8601 | } | |
8602 | ||
6324fbf3 CM |
8603 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8604 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8605 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8606 | u64 size) |
8607 | { | |
8608 | int ret; | |
6324fbf3 CM |
8609 | struct btrfs_root *extent_root; |
8610 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8611 | |
8612 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8613 | |
12fcfd22 | 8614 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8615 | |
920e4a58 | 8616 | cache = btrfs_create_block_group_cache(root, chunk_offset, size); |
0f9dd46c JB |
8617 | if (!cache) |
8618 | return -ENOMEM; | |
34d52cb6 | 8619 | |
6324fbf3 | 8620 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 | 8621 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
6324fbf3 CM |
8622 | btrfs_set_block_group_flags(&cache->item, type); |
8623 | ||
920e4a58 | 8624 | cache->flags = type; |
11833d66 | 8625 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8626 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8627 | ret = exclude_super_stripes(root, cache); |
8628 | if (ret) { | |
8629 | /* | |
8630 | * We may have excluded something, so call this just in | |
8631 | * case. | |
8632 | */ | |
8633 | free_excluded_extents(root, cache); | |
920e4a58 | 8634 | btrfs_put_block_group(cache); |
835d974f JB |
8635 | return ret; |
8636 | } | |
96303081 | 8637 | |
817d52f8 JB |
8638 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8639 | chunk_offset + size); | |
8640 | ||
11833d66 YZ |
8641 | free_excluded_extents(root, cache); |
8642 | ||
8c579fe7 JB |
8643 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
8644 | if (ret) { | |
8645 | btrfs_remove_free_space_cache(cache); | |
8646 | btrfs_put_block_group(cache); | |
8647 | return ret; | |
8648 | } | |
8649 | ||
6324fbf3 CM |
8650 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8651 | &cache->space_info); | |
8c579fe7 JB |
8652 | if (ret) { |
8653 | btrfs_remove_free_space_cache(cache); | |
8654 | spin_lock(&root->fs_info->block_group_cache_lock); | |
8655 | rb_erase(&cache->cache_node, | |
8656 | &root->fs_info->block_group_cache_tree); | |
8657 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
8658 | btrfs_put_block_group(cache); | |
8659 | return ret; | |
8660 | } | |
c7c144db | 8661 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8662 | |
8663 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8664 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8665 | spin_unlock(&cache->space_info->lock); |
8666 | ||
b742bb82 | 8667 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8668 | |
ea658bad | 8669 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8670 | |
d18a2c44 | 8671 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8672 | |
6324fbf3 CM |
8673 | return 0; |
8674 | } | |
1a40e23b | 8675 | |
10ea00f5 ID |
8676 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8677 | { | |
899c81ea ID |
8678 | u64 extra_flags = chunk_to_extended(flags) & |
8679 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8680 | |
de98ced9 | 8681 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8682 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8683 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8684 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8685 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8686 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8687 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8688 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8689 | } |
8690 | ||
1a40e23b ZY |
8691 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8692 | struct btrfs_root *root, u64 group_start) | |
8693 | { | |
8694 | struct btrfs_path *path; | |
8695 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8696 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8697 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8698 | struct btrfs_key key; |
0af3d00b | 8699 | struct inode *inode; |
1a40e23b | 8700 | int ret; |
10ea00f5 | 8701 | int index; |
89a55897 | 8702 | int factor; |
1a40e23b | 8703 | |
1a40e23b ZY |
8704 | root = root->fs_info->extent_root; |
8705 | ||
8706 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8707 | BUG_ON(!block_group); | |
c146afad | 8708 | BUG_ON(!block_group->ro); |
1a40e23b | 8709 | |
9f7c43c9 | 8710 | /* |
8711 | * Free the reserved super bytes from this block group before | |
8712 | * remove it. | |
8713 | */ | |
8714 | free_excluded_extents(root, block_group); | |
8715 | ||
1a40e23b | 8716 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8717 | index = get_block_group_index(block_group); |
89a55897 JB |
8718 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8719 | BTRFS_BLOCK_GROUP_RAID1 | | |
8720 | BTRFS_BLOCK_GROUP_RAID10)) | |
8721 | factor = 2; | |
8722 | else | |
8723 | factor = 1; | |
1a40e23b | 8724 | |
44fb5511 CM |
8725 | /* make sure this block group isn't part of an allocation cluster */ |
8726 | cluster = &root->fs_info->data_alloc_cluster; | |
8727 | spin_lock(&cluster->refill_lock); | |
8728 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8729 | spin_unlock(&cluster->refill_lock); | |
8730 | ||
8731 | /* | |
8732 | * make sure this block group isn't part of a metadata | |
8733 | * allocation cluster | |
8734 | */ | |
8735 | cluster = &root->fs_info->meta_alloc_cluster; | |
8736 | spin_lock(&cluster->refill_lock); | |
8737 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8738 | spin_unlock(&cluster->refill_lock); | |
8739 | ||
1a40e23b | 8740 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8741 | if (!path) { |
8742 | ret = -ENOMEM; | |
8743 | goto out; | |
8744 | } | |
1a40e23b | 8745 | |
10b2f34d | 8746 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8747 | if (!IS_ERR(inode)) { |
b532402e | 8748 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8749 | if (ret) { |
8750 | btrfs_add_delayed_iput(inode); | |
8751 | goto out; | |
8752 | } | |
0af3d00b JB |
8753 | clear_nlink(inode); |
8754 | /* One for the block groups ref */ | |
8755 | spin_lock(&block_group->lock); | |
8756 | if (block_group->iref) { | |
8757 | block_group->iref = 0; | |
8758 | block_group->inode = NULL; | |
8759 | spin_unlock(&block_group->lock); | |
8760 | iput(inode); | |
8761 | } else { | |
8762 | spin_unlock(&block_group->lock); | |
8763 | } | |
8764 | /* One for our lookup ref */ | |
455757c3 | 8765 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8766 | } |
8767 | ||
8768 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8769 | key.offset = block_group->key.objectid; | |
8770 | key.type = 0; | |
8771 | ||
8772 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8773 | if (ret < 0) | |
8774 | goto out; | |
8775 | if (ret > 0) | |
b3b4aa74 | 8776 | btrfs_release_path(path); |
0af3d00b JB |
8777 | if (ret == 0) { |
8778 | ret = btrfs_del_item(trans, tree_root, path); | |
8779 | if (ret) | |
8780 | goto out; | |
b3b4aa74 | 8781 | btrfs_release_path(path); |
0af3d00b JB |
8782 | } |
8783 | ||
3dfdb934 | 8784 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8785 | rb_erase(&block_group->cache_node, |
8786 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8787 | |
8788 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8789 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8790 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8791 | |
80eb234a | 8792 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8793 | /* |
8794 | * we must use list_del_init so people can check to see if they | |
8795 | * are still on the list after taking the semaphore | |
8796 | */ | |
8797 | list_del_init(&block_group->list); | |
6ab0a202 JM |
8798 | if (list_empty(&block_group->space_info->block_groups[index])) { |
8799 | kobject_del(&block_group->space_info->block_group_kobjs[index]); | |
8800 | kobject_put(&block_group->space_info->block_group_kobjs[index]); | |
10ea00f5 | 8801 | clear_avail_alloc_bits(root->fs_info, block_group->flags); |
6ab0a202 | 8802 | } |
80eb234a | 8803 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8804 | |
817d52f8 | 8805 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8806 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8807 | |
8808 | btrfs_remove_free_space_cache(block_group); | |
8809 | ||
c146afad YZ |
8810 | spin_lock(&block_group->space_info->lock); |
8811 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8812 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8813 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8814 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8815 | |
0af3d00b JB |
8816 | memcpy(&key, &block_group->key, sizeof(key)); |
8817 | ||
283bb197 | 8818 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8819 | |
fa9c0d79 CM |
8820 | btrfs_put_block_group(block_group); |
8821 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8822 | |
8823 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8824 | if (ret > 0) | |
8825 | ret = -EIO; | |
8826 | if (ret < 0) | |
8827 | goto out; | |
8828 | ||
8829 | ret = btrfs_del_item(trans, root, path); | |
8830 | out: | |
8831 | btrfs_free_path(path); | |
8832 | return ret; | |
8833 | } | |
acce952b | 8834 | |
c59021f8 | 8835 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8836 | { | |
8837 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8838 | struct btrfs_super_block *disk_super; |
8839 | u64 features; | |
8840 | u64 flags; | |
8841 | int mixed = 0; | |
c59021f8 | 8842 | int ret; |
8843 | ||
6c41761f | 8844 | disk_super = fs_info->super_copy; |
1aba86d6 | 8845 | if (!btrfs_super_root(disk_super)) |
8846 | return 1; | |
c59021f8 | 8847 | |
1aba86d6 | 8848 | features = btrfs_super_incompat_flags(disk_super); |
8849 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8850 | mixed = 1; | |
c59021f8 | 8851 | |
1aba86d6 | 8852 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8853 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8854 | if (ret) |
1aba86d6 | 8855 | goto out; |
c59021f8 | 8856 | |
1aba86d6 | 8857 | if (mixed) { |
8858 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8859 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8860 | } else { | |
8861 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8862 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8863 | if (ret) | |
8864 | goto out; | |
8865 | ||
8866 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8867 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8868 | } | |
8869 | out: | |
c59021f8 | 8870 | return ret; |
8871 | } | |
8872 | ||
acce952b | 8873 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8874 | { | |
8875 | return unpin_extent_range(root, start, end); | |
8876 | } | |
8877 | ||
8878 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8879 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8880 | { |
5378e607 | 8881 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8882 | } |
f7039b1d LD |
8883 | |
8884 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8885 | { | |
8886 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8887 | struct btrfs_block_group_cache *cache = NULL; | |
8888 | u64 group_trimmed; | |
8889 | u64 start; | |
8890 | u64 end; | |
8891 | u64 trimmed = 0; | |
2cac13e4 | 8892 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8893 | int ret = 0; |
8894 | ||
2cac13e4 LB |
8895 | /* |
8896 | * try to trim all FS space, our block group may start from non-zero. | |
8897 | */ | |
8898 | if (range->len == total_bytes) | |
8899 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8900 | else | |
8901 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8902 | |
8903 | while (cache) { | |
8904 | if (cache->key.objectid >= (range->start + range->len)) { | |
8905 | btrfs_put_block_group(cache); | |
8906 | break; | |
8907 | } | |
8908 | ||
8909 | start = max(range->start, cache->key.objectid); | |
8910 | end = min(range->start + range->len, | |
8911 | cache->key.objectid + cache->key.offset); | |
8912 | ||
8913 | if (end - start >= range->minlen) { | |
8914 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8915 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
8916 | if (ret) { |
8917 | btrfs_put_block_group(cache); | |
8918 | break; | |
8919 | } | |
8920 | ret = wait_block_group_cache_done(cache); | |
8921 | if (ret) { | |
8922 | btrfs_put_block_group(cache); | |
8923 | break; | |
8924 | } | |
f7039b1d LD |
8925 | } |
8926 | ret = btrfs_trim_block_group(cache, | |
8927 | &group_trimmed, | |
8928 | start, | |
8929 | end, | |
8930 | range->minlen); | |
8931 | ||
8932 | trimmed += group_trimmed; | |
8933 | if (ret) { | |
8934 | btrfs_put_block_group(cache); | |
8935 | break; | |
8936 | } | |
8937 | } | |
8938 | ||
8939 | cache = next_block_group(fs_info->tree_root, cache); | |
8940 | } | |
8941 | ||
8942 | range->len = trimmed; | |
8943 | return ret; | |
8944 | } | |
8257b2dc MX |
8945 | |
8946 | /* | |
8947 | * btrfs_{start,end}_write() is similar to mnt_{want, drop}_write(), | |
8948 | * they are used to prevent the some tasks writing data into the page cache | |
8949 | * by nocow before the subvolume is snapshoted, but flush the data into | |
8950 | * the disk after the snapshot creation. | |
8951 | */ | |
8952 | void btrfs_end_nocow_write(struct btrfs_root *root) | |
8953 | { | |
8954 | percpu_counter_dec(&root->subv_writers->counter); | |
8955 | /* | |
8956 | * Make sure counter is updated before we wake up | |
8957 | * waiters. | |
8958 | */ | |
8959 | smp_mb(); | |
8960 | if (waitqueue_active(&root->subv_writers->wait)) | |
8961 | wake_up(&root->subv_writers->wait); | |
8962 | } | |
8963 | ||
8964 | int btrfs_start_nocow_write(struct btrfs_root *root) | |
8965 | { | |
8966 | if (unlikely(atomic_read(&root->will_be_snapshoted))) | |
8967 | return 0; | |
8968 | ||
8969 | percpu_counter_inc(&root->subv_writers->counter); | |
8970 | /* | |
8971 | * Make sure counter is updated before we check for snapshot creation. | |
8972 | */ | |
8973 | smp_mb(); | |
8974 | if (unlikely(atomic_read(&root->will_be_snapshoted))) { | |
8975 | btrfs_end_nocow_write(root); | |
8976 | return 0; | |
8977 | } | |
8978 | return 1; | |
8979 | } |