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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
4b4e25f2 | 27 | #include "compat.h" |
74493f7a | 28 | #include "hash.h" |
fec577fb CM |
29 | #include "ctree.h" |
30 | #include "disk-io.h" | |
31 | #include "print-tree.h" | |
e089f05c | 32 | #include "transaction.h" |
0b86a832 | 33 | #include "volumes.h" |
925baedd | 34 | #include "locking.h" |
fa9c0d79 | 35 | #include "free-space-cache.h" |
fec577fb | 36 | |
0e4f8f88 CM |
37 | /* control flags for do_chunk_alloc's force field |
38 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk | |
39 | * if we really need one. | |
40 | * | |
41 | * CHUNK_ALLOC_FORCE means it must try to allocate one | |
42 | * | |
43 | * CHUNK_ALLOC_LIMITED means to only try and allocate one | |
44 | * if we have very few chunks already allocated. This is | |
45 | * used as part of the clustering code to help make sure | |
46 | * we have a good pool of storage to cluster in, without | |
47 | * filling the FS with empty chunks | |
48 | * | |
49 | */ | |
50 | enum { | |
51 | CHUNK_ALLOC_NO_FORCE = 0, | |
52 | CHUNK_ALLOC_FORCE = 1, | |
53 | CHUNK_ALLOC_LIMITED = 2, | |
54 | }; | |
55 | ||
fb25e914 JB |
56 | /* |
57 | * Control how reservations are dealt with. | |
58 | * | |
59 | * RESERVE_FREE - freeing a reservation. | |
60 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
61 | * ENOSPC accounting | |
62 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
63 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
64 | */ | |
65 | enum { | |
66 | RESERVE_FREE = 0, | |
67 | RESERVE_ALLOC = 1, | |
68 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
69 | }; | |
70 | ||
f3465ca4 JB |
71 | static int update_block_group(struct btrfs_trans_handle *trans, |
72 | struct btrfs_root *root, | |
f0486c68 | 73 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
74 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
75 | struct btrfs_root *root, | |
76 | u64 bytenr, u64 num_bytes, u64 parent, | |
77 | u64 root_objectid, u64 owner_objectid, | |
78 | u64 owner_offset, int refs_to_drop, | |
79 | struct btrfs_delayed_extent_op *extra_op); | |
80 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
81 | struct extent_buffer *leaf, | |
82 | struct btrfs_extent_item *ei); | |
83 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
84 | struct btrfs_root *root, | |
85 | u64 parent, u64 root_objectid, | |
86 | u64 flags, u64 owner, u64 offset, | |
87 | struct btrfs_key *ins, int ref_mod); | |
88 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
89 | struct btrfs_root *root, | |
90 | u64 parent, u64 root_objectid, | |
91 | u64 flags, struct btrfs_disk_key *key, | |
92 | int level, struct btrfs_key *ins); | |
6a63209f JB |
93 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
94 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
95 | u64 flags, int force); | |
11833d66 YZ |
96 | static int find_next_key(struct btrfs_path *path, int level, |
97 | struct btrfs_key *key); | |
9ed74f2d JB |
98 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
99 | int dump_block_groups); | |
fb25e914 JB |
100 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
101 | u64 num_bytes, int reserve); | |
6a63209f | 102 | |
817d52f8 JB |
103 | static noinline int |
104 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
105 | { | |
106 | smp_mb(); | |
107 | return cache->cached == BTRFS_CACHE_FINISHED; | |
108 | } | |
109 | ||
0f9dd46c JB |
110 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
111 | { | |
112 | return (cache->flags & bits) == bits; | |
113 | } | |
114 | ||
62a45b60 | 115 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
116 | { |
117 | atomic_inc(&cache->count); | |
118 | } | |
119 | ||
120 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
121 | { | |
f0486c68 YZ |
122 | if (atomic_dec_and_test(&cache->count)) { |
123 | WARN_ON(cache->pinned > 0); | |
124 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 125 | kfree(cache->free_space_ctl); |
11dfe35a | 126 | kfree(cache); |
f0486c68 | 127 | } |
11dfe35a JB |
128 | } |
129 | ||
0f9dd46c JB |
130 | /* |
131 | * this adds the block group to the fs_info rb tree for the block group | |
132 | * cache | |
133 | */ | |
b2950863 | 134 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
135 | struct btrfs_block_group_cache *block_group) |
136 | { | |
137 | struct rb_node **p; | |
138 | struct rb_node *parent = NULL; | |
139 | struct btrfs_block_group_cache *cache; | |
140 | ||
141 | spin_lock(&info->block_group_cache_lock); | |
142 | p = &info->block_group_cache_tree.rb_node; | |
143 | ||
144 | while (*p) { | |
145 | parent = *p; | |
146 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
147 | cache_node); | |
148 | if (block_group->key.objectid < cache->key.objectid) { | |
149 | p = &(*p)->rb_left; | |
150 | } else if (block_group->key.objectid > cache->key.objectid) { | |
151 | p = &(*p)->rb_right; | |
152 | } else { | |
153 | spin_unlock(&info->block_group_cache_lock); | |
154 | return -EEXIST; | |
155 | } | |
156 | } | |
157 | ||
158 | rb_link_node(&block_group->cache_node, parent, p); | |
159 | rb_insert_color(&block_group->cache_node, | |
160 | &info->block_group_cache_tree); | |
161 | spin_unlock(&info->block_group_cache_lock); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /* | |
167 | * This will return the block group at or after bytenr if contains is 0, else | |
168 | * it will return the block group that contains the bytenr | |
169 | */ | |
170 | static struct btrfs_block_group_cache * | |
171 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
172 | int contains) | |
173 | { | |
174 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
175 | struct rb_node *n; | |
176 | u64 end, start; | |
177 | ||
178 | spin_lock(&info->block_group_cache_lock); | |
179 | n = info->block_group_cache_tree.rb_node; | |
180 | ||
181 | while (n) { | |
182 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
183 | cache_node); | |
184 | end = cache->key.objectid + cache->key.offset - 1; | |
185 | start = cache->key.objectid; | |
186 | ||
187 | if (bytenr < start) { | |
188 | if (!contains && (!ret || start < ret->key.objectid)) | |
189 | ret = cache; | |
190 | n = n->rb_left; | |
191 | } else if (bytenr > start) { | |
192 | if (contains && bytenr <= end) { | |
193 | ret = cache; | |
194 | break; | |
195 | } | |
196 | n = n->rb_right; | |
197 | } else { | |
198 | ret = cache; | |
199 | break; | |
200 | } | |
201 | } | |
d2fb3437 | 202 | if (ret) |
11dfe35a | 203 | btrfs_get_block_group(ret); |
0f9dd46c JB |
204 | spin_unlock(&info->block_group_cache_lock); |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
11833d66 YZ |
209 | static int add_excluded_extent(struct btrfs_root *root, |
210 | u64 start, u64 num_bytes) | |
817d52f8 | 211 | { |
11833d66 YZ |
212 | u64 end = start + num_bytes - 1; |
213 | set_extent_bits(&root->fs_info->freed_extents[0], | |
214 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
215 | set_extent_bits(&root->fs_info->freed_extents[1], | |
216 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
217 | return 0; | |
218 | } | |
817d52f8 | 219 | |
11833d66 YZ |
220 | static void free_excluded_extents(struct btrfs_root *root, |
221 | struct btrfs_block_group_cache *cache) | |
222 | { | |
223 | u64 start, end; | |
817d52f8 | 224 | |
11833d66 YZ |
225 | start = cache->key.objectid; |
226 | end = start + cache->key.offset - 1; | |
227 | ||
228 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
229 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
230 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
231 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
232 | } |
233 | ||
11833d66 YZ |
234 | static int exclude_super_stripes(struct btrfs_root *root, |
235 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 236 | { |
817d52f8 JB |
237 | u64 bytenr; |
238 | u64 *logical; | |
239 | int stripe_len; | |
240 | int i, nr, ret; | |
241 | ||
06b2331f YZ |
242 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
243 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
244 | cache->bytes_super += stripe_len; | |
245 | ret = add_excluded_extent(root, cache->key.objectid, | |
246 | stripe_len); | |
247 | BUG_ON(ret); | |
248 | } | |
249 | ||
817d52f8 JB |
250 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
251 | bytenr = btrfs_sb_offset(i); | |
252 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
253 | cache->key.objectid, bytenr, | |
254 | 0, &logical, &nr, &stripe_len); | |
255 | BUG_ON(ret); | |
11833d66 | 256 | |
817d52f8 | 257 | while (nr--) { |
1b2da372 | 258 | cache->bytes_super += stripe_len; |
11833d66 YZ |
259 | ret = add_excluded_extent(root, logical[nr], |
260 | stripe_len); | |
261 | BUG_ON(ret); | |
817d52f8 | 262 | } |
11833d66 | 263 | |
817d52f8 JB |
264 | kfree(logical); |
265 | } | |
817d52f8 JB |
266 | return 0; |
267 | } | |
268 | ||
11833d66 YZ |
269 | static struct btrfs_caching_control * |
270 | get_caching_control(struct btrfs_block_group_cache *cache) | |
271 | { | |
272 | struct btrfs_caching_control *ctl; | |
273 | ||
274 | spin_lock(&cache->lock); | |
275 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
276 | spin_unlock(&cache->lock); | |
277 | return NULL; | |
278 | } | |
279 | ||
dde5abee JB |
280 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
281 | if (!cache->caching_ctl) { | |
282 | spin_unlock(&cache->lock); | |
11833d66 YZ |
283 | return NULL; |
284 | } | |
285 | ||
286 | ctl = cache->caching_ctl; | |
287 | atomic_inc(&ctl->count); | |
288 | spin_unlock(&cache->lock); | |
289 | return ctl; | |
290 | } | |
291 | ||
292 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
293 | { | |
294 | if (atomic_dec_and_test(&ctl->count)) | |
295 | kfree(ctl); | |
296 | } | |
297 | ||
0f9dd46c JB |
298 | /* |
299 | * this is only called by cache_block_group, since we could have freed extents | |
300 | * we need to check the pinned_extents for any extents that can't be used yet | |
301 | * since their free space will be released as soon as the transaction commits. | |
302 | */ | |
817d52f8 | 303 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
304 | struct btrfs_fs_info *info, u64 start, u64 end) |
305 | { | |
817d52f8 | 306 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
307 | int ret; |
308 | ||
309 | while (start < end) { | |
11833d66 | 310 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 311 | &extent_start, &extent_end, |
11833d66 | 312 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
313 | if (ret) |
314 | break; | |
315 | ||
06b2331f | 316 | if (extent_start <= start) { |
0f9dd46c JB |
317 | start = extent_end + 1; |
318 | } else if (extent_start > start && extent_start < end) { | |
319 | size = extent_start - start; | |
817d52f8 | 320 | total_added += size; |
ea6a478e JB |
321 | ret = btrfs_add_free_space(block_group, start, |
322 | size); | |
0f9dd46c JB |
323 | BUG_ON(ret); |
324 | start = extent_end + 1; | |
325 | } else { | |
326 | break; | |
327 | } | |
328 | } | |
329 | ||
330 | if (start < end) { | |
331 | size = end - start; | |
817d52f8 | 332 | total_added += size; |
ea6a478e | 333 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
334 | BUG_ON(ret); |
335 | } | |
336 | ||
817d52f8 | 337 | return total_added; |
0f9dd46c JB |
338 | } |
339 | ||
bab39bf9 | 340 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 341 | { |
bab39bf9 JB |
342 | struct btrfs_block_group_cache *block_group; |
343 | struct btrfs_fs_info *fs_info; | |
344 | struct btrfs_caching_control *caching_ctl; | |
345 | struct btrfs_root *extent_root; | |
e37c9e69 | 346 | struct btrfs_path *path; |
5f39d397 | 347 | struct extent_buffer *leaf; |
11833d66 | 348 | struct btrfs_key key; |
817d52f8 | 349 | u64 total_found = 0; |
11833d66 YZ |
350 | u64 last = 0; |
351 | u32 nritems; | |
352 | int ret = 0; | |
f510cfec | 353 | |
bab39bf9 JB |
354 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
355 | block_group = caching_ctl->block_group; | |
356 | fs_info = block_group->fs_info; | |
357 | extent_root = fs_info->extent_root; | |
358 | ||
e37c9e69 CM |
359 | path = btrfs_alloc_path(); |
360 | if (!path) | |
bab39bf9 | 361 | goto out; |
7d7d6068 | 362 | |
817d52f8 | 363 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 364 | |
5cd57b2c | 365 | /* |
817d52f8 JB |
366 | * We don't want to deadlock with somebody trying to allocate a new |
367 | * extent for the extent root while also trying to search the extent | |
368 | * root to add free space. So we skip locking and search the commit | |
369 | * root, since its read-only | |
5cd57b2c CM |
370 | */ |
371 | path->skip_locking = 1; | |
817d52f8 | 372 | path->search_commit_root = 1; |
026fd317 | 373 | path->reada = 1; |
817d52f8 | 374 | |
e4404d6e | 375 | key.objectid = last; |
e37c9e69 | 376 | key.offset = 0; |
11833d66 | 377 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 378 | again: |
11833d66 | 379 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
380 | /* need to make sure the commit_root doesn't disappear */ |
381 | down_read(&fs_info->extent_commit_sem); | |
382 | ||
11833d66 | 383 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 384 | if (ret < 0) |
ef8bbdfe | 385 | goto err; |
a512bbf8 | 386 | |
11833d66 YZ |
387 | leaf = path->nodes[0]; |
388 | nritems = btrfs_header_nritems(leaf); | |
389 | ||
d397712b | 390 | while (1) { |
7841cb28 | 391 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 392 | last = (u64)-1; |
817d52f8 | 393 | break; |
f25784b3 | 394 | } |
817d52f8 | 395 | |
11833d66 YZ |
396 | if (path->slots[0] < nritems) { |
397 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
398 | } else { | |
399 | ret = find_next_key(path, 0, &key); | |
400 | if (ret) | |
e37c9e69 | 401 | break; |
817d52f8 | 402 | |
589d8ade JB |
403 | if (need_resched() || |
404 | btrfs_next_leaf(extent_root, path)) { | |
405 | caching_ctl->progress = last; | |
ff5714cc | 406 | btrfs_release_path(path); |
589d8ade JB |
407 | up_read(&fs_info->extent_commit_sem); |
408 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 409 | cond_resched(); |
589d8ade JB |
410 | goto again; |
411 | } | |
412 | leaf = path->nodes[0]; | |
413 | nritems = btrfs_header_nritems(leaf); | |
414 | continue; | |
11833d66 | 415 | } |
817d52f8 | 416 | |
11833d66 YZ |
417 | if (key.objectid < block_group->key.objectid) { |
418 | path->slots[0]++; | |
817d52f8 | 419 | continue; |
e37c9e69 | 420 | } |
0f9dd46c | 421 | |
e37c9e69 | 422 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 423 | block_group->key.offset) |
e37c9e69 | 424 | break; |
7d7d6068 | 425 | |
11833d66 | 426 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
427 | total_found += add_new_free_space(block_group, |
428 | fs_info, last, | |
429 | key.objectid); | |
7d7d6068 | 430 | last = key.objectid + key.offset; |
817d52f8 | 431 | |
11833d66 YZ |
432 | if (total_found > (1024 * 1024 * 2)) { |
433 | total_found = 0; | |
434 | wake_up(&caching_ctl->wait); | |
435 | } | |
817d52f8 | 436 | } |
e37c9e69 CM |
437 | path->slots[0]++; |
438 | } | |
817d52f8 | 439 | ret = 0; |
e37c9e69 | 440 | |
817d52f8 JB |
441 | total_found += add_new_free_space(block_group, fs_info, last, |
442 | block_group->key.objectid + | |
443 | block_group->key.offset); | |
11833d66 | 444 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
445 | |
446 | spin_lock(&block_group->lock); | |
11833d66 | 447 | block_group->caching_ctl = NULL; |
817d52f8 JB |
448 | block_group->cached = BTRFS_CACHE_FINISHED; |
449 | spin_unlock(&block_group->lock); | |
0f9dd46c | 450 | |
54aa1f4d | 451 | err: |
e37c9e69 | 452 | btrfs_free_path(path); |
276e680d | 453 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 454 | |
11833d66 YZ |
455 | free_excluded_extents(extent_root, block_group); |
456 | ||
457 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 458 | out: |
11833d66 YZ |
459 | wake_up(&caching_ctl->wait); |
460 | ||
461 | put_caching_control(caching_ctl); | |
11dfe35a | 462 | btrfs_put_block_group(block_group); |
817d52f8 JB |
463 | } |
464 | ||
9d66e233 JB |
465 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
466 | struct btrfs_trans_handle *trans, | |
b8399dee | 467 | struct btrfs_root *root, |
9d66e233 | 468 | int load_cache_only) |
817d52f8 | 469 | { |
291c7d2f | 470 | DEFINE_WAIT(wait); |
11833d66 YZ |
471 | struct btrfs_fs_info *fs_info = cache->fs_info; |
472 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
473 | int ret = 0; |
474 | ||
291c7d2f JB |
475 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
476 | BUG_ON(!caching_ctl); | |
477 | ||
478 | INIT_LIST_HEAD(&caching_ctl->list); | |
479 | mutex_init(&caching_ctl->mutex); | |
480 | init_waitqueue_head(&caching_ctl->wait); | |
481 | caching_ctl->block_group = cache; | |
482 | caching_ctl->progress = cache->key.objectid; | |
483 | atomic_set(&caching_ctl->count, 1); | |
484 | caching_ctl->work.func = caching_thread; | |
485 | ||
486 | spin_lock(&cache->lock); | |
487 | /* | |
488 | * This should be a rare occasion, but this could happen I think in the | |
489 | * case where one thread starts to load the space cache info, and then | |
490 | * some other thread starts a transaction commit which tries to do an | |
491 | * allocation while the other thread is still loading the space cache | |
492 | * info. The previous loop should have kept us from choosing this block | |
493 | * group, but if we've moved to the state where we will wait on caching | |
494 | * block groups we need to first check if we're doing a fast load here, | |
495 | * so we can wait for it to finish, otherwise we could end up allocating | |
496 | * from a block group who's cache gets evicted for one reason or | |
497 | * another. | |
498 | */ | |
499 | while (cache->cached == BTRFS_CACHE_FAST) { | |
500 | struct btrfs_caching_control *ctl; | |
501 | ||
502 | ctl = cache->caching_ctl; | |
503 | atomic_inc(&ctl->count); | |
504 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
505 | spin_unlock(&cache->lock); | |
506 | ||
507 | schedule(); | |
508 | ||
509 | finish_wait(&ctl->wait, &wait); | |
510 | put_caching_control(ctl); | |
511 | spin_lock(&cache->lock); | |
512 | } | |
513 | ||
514 | if (cache->cached != BTRFS_CACHE_NO) { | |
515 | spin_unlock(&cache->lock); | |
516 | kfree(caching_ctl); | |
11833d66 | 517 | return 0; |
291c7d2f JB |
518 | } |
519 | WARN_ON(cache->caching_ctl); | |
520 | cache->caching_ctl = caching_ctl; | |
521 | cache->cached = BTRFS_CACHE_FAST; | |
522 | spin_unlock(&cache->lock); | |
11833d66 | 523 | |
9d66e233 JB |
524 | /* |
525 | * We can't do the read from on-disk cache during a commit since we need | |
b8399dee JB |
526 | * to have the normal tree locking. Also if we are currently trying to |
527 | * allocate blocks for the tree root we can't do the fast caching since | |
528 | * we likely hold important locks. | |
9d66e233 | 529 | */ |
f7039b1d | 530 | if (trans && (!trans->transaction->in_commit) && |
73bc1876 JB |
531 | (root && root != root->fs_info->tree_root) && |
532 | btrfs_test_opt(root, SPACE_CACHE)) { | |
9d66e233 JB |
533 | ret = load_free_space_cache(fs_info, cache); |
534 | ||
535 | spin_lock(&cache->lock); | |
536 | if (ret == 1) { | |
291c7d2f | 537 | cache->caching_ctl = NULL; |
9d66e233 JB |
538 | cache->cached = BTRFS_CACHE_FINISHED; |
539 | cache->last_byte_to_unpin = (u64)-1; | |
540 | } else { | |
291c7d2f JB |
541 | if (load_cache_only) { |
542 | cache->caching_ctl = NULL; | |
543 | cache->cached = BTRFS_CACHE_NO; | |
544 | } else { | |
545 | cache->cached = BTRFS_CACHE_STARTED; | |
546 | } | |
9d66e233 JB |
547 | } |
548 | spin_unlock(&cache->lock); | |
291c7d2f | 549 | wake_up(&caching_ctl->wait); |
3c14874a | 550 | if (ret == 1) { |
291c7d2f | 551 | put_caching_control(caching_ctl); |
3c14874a | 552 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 553 | return 0; |
3c14874a | 554 | } |
291c7d2f JB |
555 | } else { |
556 | /* | |
557 | * We are not going to do the fast caching, set cached to the | |
558 | * appropriate value and wakeup any waiters. | |
559 | */ | |
560 | spin_lock(&cache->lock); | |
561 | if (load_cache_only) { | |
562 | cache->caching_ctl = NULL; | |
563 | cache->cached = BTRFS_CACHE_NO; | |
564 | } else { | |
565 | cache->cached = BTRFS_CACHE_STARTED; | |
566 | } | |
567 | spin_unlock(&cache->lock); | |
568 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
569 | } |
570 | ||
291c7d2f JB |
571 | if (load_cache_only) { |
572 | put_caching_control(caching_ctl); | |
11833d66 | 573 | return 0; |
817d52f8 | 574 | } |
817d52f8 | 575 | |
11833d66 | 576 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 577 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
578 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
579 | up_write(&fs_info->extent_commit_sem); | |
580 | ||
11dfe35a | 581 | btrfs_get_block_group(cache); |
11833d66 | 582 | |
bab39bf9 | 583 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 584 | |
ef8bbdfe | 585 | return ret; |
e37c9e69 CM |
586 | } |
587 | ||
0f9dd46c JB |
588 | /* |
589 | * return the block group that starts at or after bytenr | |
590 | */ | |
d397712b CM |
591 | static struct btrfs_block_group_cache * |
592 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 593 | { |
0f9dd46c | 594 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 595 | |
0f9dd46c | 596 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 597 | |
0f9dd46c | 598 | return cache; |
0ef3e66b CM |
599 | } |
600 | ||
0f9dd46c | 601 | /* |
9f55684c | 602 | * return the block group that contains the given bytenr |
0f9dd46c | 603 | */ |
d397712b CM |
604 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
605 | struct btrfs_fs_info *info, | |
606 | u64 bytenr) | |
be744175 | 607 | { |
0f9dd46c | 608 | struct btrfs_block_group_cache *cache; |
be744175 | 609 | |
0f9dd46c | 610 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 611 | |
0f9dd46c | 612 | return cache; |
be744175 | 613 | } |
0b86a832 | 614 | |
0f9dd46c JB |
615 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
616 | u64 flags) | |
6324fbf3 | 617 | { |
0f9dd46c | 618 | struct list_head *head = &info->space_info; |
0f9dd46c | 619 | struct btrfs_space_info *found; |
4184ea7f | 620 | |
b742bb82 YZ |
621 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
622 | BTRFS_BLOCK_GROUP_METADATA; | |
623 | ||
4184ea7f CM |
624 | rcu_read_lock(); |
625 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 626 | if (found->flags & flags) { |
4184ea7f | 627 | rcu_read_unlock(); |
0f9dd46c | 628 | return found; |
4184ea7f | 629 | } |
0f9dd46c | 630 | } |
4184ea7f | 631 | rcu_read_unlock(); |
0f9dd46c | 632 | return NULL; |
6324fbf3 CM |
633 | } |
634 | ||
4184ea7f CM |
635 | /* |
636 | * after adding space to the filesystem, we need to clear the full flags | |
637 | * on all the space infos. | |
638 | */ | |
639 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
640 | { | |
641 | struct list_head *head = &info->space_info; | |
642 | struct btrfs_space_info *found; | |
643 | ||
644 | rcu_read_lock(); | |
645 | list_for_each_entry_rcu(found, head, list) | |
646 | found->full = 0; | |
647 | rcu_read_unlock(); | |
648 | } | |
649 | ||
80eb234a JB |
650 | static u64 div_factor(u64 num, int factor) |
651 | { | |
652 | if (factor == 10) | |
653 | return num; | |
654 | num *= factor; | |
655 | do_div(num, 10); | |
656 | return num; | |
657 | } | |
658 | ||
e5bc2458 CM |
659 | static u64 div_factor_fine(u64 num, int factor) |
660 | { | |
661 | if (factor == 100) | |
662 | return num; | |
663 | num *= factor; | |
664 | do_div(num, 100); | |
665 | return num; | |
666 | } | |
667 | ||
d2fb3437 YZ |
668 | u64 btrfs_find_block_group(struct btrfs_root *root, |
669 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 670 | { |
96b5179d | 671 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 672 | u64 used; |
d2fb3437 YZ |
673 | u64 last = max(search_hint, search_start); |
674 | u64 group_start = 0; | |
31f3c99b | 675 | int full_search = 0; |
d2fb3437 | 676 | int factor = 9; |
0ef3e66b | 677 | int wrapped = 0; |
31f3c99b | 678 | again: |
e8569813 ZY |
679 | while (1) { |
680 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
681 | if (!cache) |
682 | break; | |
96b5179d | 683 | |
c286ac48 | 684 | spin_lock(&cache->lock); |
96b5179d CM |
685 | last = cache->key.objectid + cache->key.offset; |
686 | used = btrfs_block_group_used(&cache->item); | |
687 | ||
d2fb3437 YZ |
688 | if ((full_search || !cache->ro) && |
689 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 690 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
691 | div_factor(cache->key.offset, factor)) { |
692 | group_start = cache->key.objectid; | |
c286ac48 | 693 | spin_unlock(&cache->lock); |
fa9c0d79 | 694 | btrfs_put_block_group(cache); |
8790d502 CM |
695 | goto found; |
696 | } | |
6324fbf3 | 697 | } |
c286ac48 | 698 | spin_unlock(&cache->lock); |
fa9c0d79 | 699 | btrfs_put_block_group(cache); |
de428b63 | 700 | cond_resched(); |
cd1bc465 | 701 | } |
0ef3e66b CM |
702 | if (!wrapped) { |
703 | last = search_start; | |
704 | wrapped = 1; | |
705 | goto again; | |
706 | } | |
707 | if (!full_search && factor < 10) { | |
be744175 | 708 | last = search_start; |
31f3c99b | 709 | full_search = 1; |
0ef3e66b | 710 | factor = 10; |
31f3c99b CM |
711 | goto again; |
712 | } | |
be744175 | 713 | found: |
d2fb3437 | 714 | return group_start; |
925baedd | 715 | } |
0f9dd46c | 716 | |
e02119d5 | 717 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 718 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
719 | { |
720 | int ret; | |
721 | struct btrfs_key key; | |
31840ae1 | 722 | struct btrfs_path *path; |
e02119d5 | 723 | |
31840ae1 | 724 | path = btrfs_alloc_path(); |
d8926bb3 MF |
725 | if (!path) |
726 | return -ENOMEM; | |
727 | ||
e02119d5 CM |
728 | key.objectid = start; |
729 | key.offset = len; | |
730 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
731 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
732 | 0, 0); | |
31840ae1 | 733 | btrfs_free_path(path); |
7bb86316 CM |
734 | return ret; |
735 | } | |
736 | ||
a22285a6 YZ |
737 | /* |
738 | * helper function to lookup reference count and flags of extent. | |
739 | * | |
740 | * the head node for delayed ref is used to store the sum of all the | |
741 | * reference count modifications queued up in the rbtree. the head | |
742 | * node may also store the extent flags to set. This way you can check | |
743 | * to see what the reference count and extent flags would be if all of | |
744 | * the delayed refs are not processed. | |
745 | */ | |
746 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
747 | struct btrfs_root *root, u64 bytenr, | |
748 | u64 num_bytes, u64 *refs, u64 *flags) | |
749 | { | |
750 | struct btrfs_delayed_ref_head *head; | |
751 | struct btrfs_delayed_ref_root *delayed_refs; | |
752 | struct btrfs_path *path; | |
753 | struct btrfs_extent_item *ei; | |
754 | struct extent_buffer *leaf; | |
755 | struct btrfs_key key; | |
756 | u32 item_size; | |
757 | u64 num_refs; | |
758 | u64 extent_flags; | |
759 | int ret; | |
760 | ||
761 | path = btrfs_alloc_path(); | |
762 | if (!path) | |
763 | return -ENOMEM; | |
764 | ||
765 | key.objectid = bytenr; | |
766 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
767 | key.offset = num_bytes; | |
768 | if (!trans) { | |
769 | path->skip_locking = 1; | |
770 | path->search_commit_root = 1; | |
771 | } | |
772 | again: | |
773 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
774 | &key, path, 0, 0); | |
775 | if (ret < 0) | |
776 | goto out_free; | |
777 | ||
778 | if (ret == 0) { | |
779 | leaf = path->nodes[0]; | |
780 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
781 | if (item_size >= sizeof(*ei)) { | |
782 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
783 | struct btrfs_extent_item); | |
784 | num_refs = btrfs_extent_refs(leaf, ei); | |
785 | extent_flags = btrfs_extent_flags(leaf, ei); | |
786 | } else { | |
787 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
788 | struct btrfs_extent_item_v0 *ei0; | |
789 | BUG_ON(item_size != sizeof(*ei0)); | |
790 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
791 | struct btrfs_extent_item_v0); | |
792 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
793 | /* FIXME: this isn't correct for data */ | |
794 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
795 | #else | |
796 | BUG(); | |
797 | #endif | |
798 | } | |
799 | BUG_ON(num_refs == 0); | |
800 | } else { | |
801 | num_refs = 0; | |
802 | extent_flags = 0; | |
803 | ret = 0; | |
804 | } | |
805 | ||
806 | if (!trans) | |
807 | goto out; | |
808 | ||
809 | delayed_refs = &trans->transaction->delayed_refs; | |
810 | spin_lock(&delayed_refs->lock); | |
811 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
812 | if (head) { | |
813 | if (!mutex_trylock(&head->mutex)) { | |
814 | atomic_inc(&head->node.refs); | |
815 | spin_unlock(&delayed_refs->lock); | |
816 | ||
b3b4aa74 | 817 | btrfs_release_path(path); |
a22285a6 | 818 | |
8cc33e5c DS |
819 | /* |
820 | * Mutex was contended, block until it's released and try | |
821 | * again | |
822 | */ | |
a22285a6 YZ |
823 | mutex_lock(&head->mutex); |
824 | mutex_unlock(&head->mutex); | |
825 | btrfs_put_delayed_ref(&head->node); | |
826 | goto again; | |
827 | } | |
828 | if (head->extent_op && head->extent_op->update_flags) | |
829 | extent_flags |= head->extent_op->flags_to_set; | |
830 | else | |
831 | BUG_ON(num_refs == 0); | |
832 | ||
833 | num_refs += head->node.ref_mod; | |
834 | mutex_unlock(&head->mutex); | |
835 | } | |
836 | spin_unlock(&delayed_refs->lock); | |
837 | out: | |
838 | WARN_ON(num_refs == 0); | |
839 | if (refs) | |
840 | *refs = num_refs; | |
841 | if (flags) | |
842 | *flags = extent_flags; | |
843 | out_free: | |
844 | btrfs_free_path(path); | |
845 | return ret; | |
846 | } | |
847 | ||
d8d5f3e1 CM |
848 | /* |
849 | * Back reference rules. Back refs have three main goals: | |
850 | * | |
851 | * 1) differentiate between all holders of references to an extent so that | |
852 | * when a reference is dropped we can make sure it was a valid reference | |
853 | * before freeing the extent. | |
854 | * | |
855 | * 2) Provide enough information to quickly find the holders of an extent | |
856 | * if we notice a given block is corrupted or bad. | |
857 | * | |
858 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
859 | * maintenance. This is actually the same as #2, but with a slightly | |
860 | * different use case. | |
861 | * | |
5d4f98a2 YZ |
862 | * There are two kinds of back refs. The implicit back refs is optimized |
863 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
864 | * back refs of this kind provide information about the block's owner tree | |
865 | * and the pointer's key. These information allow us to find the block by | |
866 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
867 | * referenced by their owner trees. The location of tree block is recorded | |
868 | * in the back refs. Actually the full back refs is generic, and can be | |
869 | * used in all cases the implicit back refs is used. The major shortcoming | |
870 | * of the full back refs is its overhead. Every time a tree block gets | |
871 | * COWed, we have to update back refs entry for all pointers in it. | |
872 | * | |
873 | * For a newly allocated tree block, we use implicit back refs for | |
874 | * pointers in it. This means most tree related operations only involve | |
875 | * implicit back refs. For a tree block created in old transaction, the | |
876 | * only way to drop a reference to it is COW it. So we can detect the | |
877 | * event that tree block loses its owner tree's reference and do the | |
878 | * back refs conversion. | |
879 | * | |
880 | * When a tree block is COW'd through a tree, there are four cases: | |
881 | * | |
882 | * The reference count of the block is one and the tree is the block's | |
883 | * owner tree. Nothing to do in this case. | |
884 | * | |
885 | * The reference count of the block is one and the tree is not the | |
886 | * block's owner tree. In this case, full back refs is used for pointers | |
887 | * in the block. Remove these full back refs, add implicit back refs for | |
888 | * every pointers in the new block. | |
889 | * | |
890 | * The reference count of the block is greater than one and the tree is | |
891 | * the block's owner tree. In this case, implicit back refs is used for | |
892 | * pointers in the block. Add full back refs for every pointers in the | |
893 | * block, increase lower level extents' reference counts. The original | |
894 | * implicit back refs are entailed to the new block. | |
895 | * | |
896 | * The reference count of the block is greater than one and the tree is | |
897 | * not the block's owner tree. Add implicit back refs for every pointer in | |
898 | * the new block, increase lower level extents' reference count. | |
899 | * | |
900 | * Back Reference Key composing: | |
901 | * | |
902 | * The key objectid corresponds to the first byte in the extent, | |
903 | * The key type is used to differentiate between types of back refs. | |
904 | * There are different meanings of the key offset for different types | |
905 | * of back refs. | |
906 | * | |
d8d5f3e1 CM |
907 | * File extents can be referenced by: |
908 | * | |
909 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 910 | * - different files inside a single subvolume |
d8d5f3e1 CM |
911 | * - different offsets inside a file (bookend extents in file.c) |
912 | * | |
5d4f98a2 | 913 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
914 | * |
915 | * - Objectid of the subvolume root | |
d8d5f3e1 | 916 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
917 | * - original offset in the file |
918 | * - how many bookend extents | |
d8d5f3e1 | 919 | * |
5d4f98a2 YZ |
920 | * The key offset for the implicit back refs is hash of the first |
921 | * three fields. | |
d8d5f3e1 | 922 | * |
5d4f98a2 | 923 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 924 | * |
5d4f98a2 | 925 | * - number of pointers in the tree leaf |
d8d5f3e1 | 926 | * |
5d4f98a2 YZ |
927 | * The key offset for the implicit back refs is the first byte of |
928 | * the tree leaf | |
d8d5f3e1 | 929 | * |
5d4f98a2 YZ |
930 | * When a file extent is allocated, The implicit back refs is used. |
931 | * the fields are filled in: | |
d8d5f3e1 | 932 | * |
5d4f98a2 | 933 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 934 | * |
5d4f98a2 YZ |
935 | * When a file extent is removed file truncation, we find the |
936 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 937 | * |
5d4f98a2 | 938 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 939 | * |
5d4f98a2 | 940 | * Btree extents can be referenced by: |
d8d5f3e1 | 941 | * |
5d4f98a2 | 942 | * - Different subvolumes |
d8d5f3e1 | 943 | * |
5d4f98a2 YZ |
944 | * Both the implicit back refs and the full back refs for tree blocks |
945 | * only consist of key. The key offset for the implicit back refs is | |
946 | * objectid of block's owner tree. The key offset for the full back refs | |
947 | * is the first byte of parent block. | |
d8d5f3e1 | 948 | * |
5d4f98a2 YZ |
949 | * When implicit back refs is used, information about the lowest key and |
950 | * level of the tree block are required. These information are stored in | |
951 | * tree block info structure. | |
d8d5f3e1 | 952 | */ |
31840ae1 | 953 | |
5d4f98a2 YZ |
954 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
955 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
956 | struct btrfs_root *root, | |
957 | struct btrfs_path *path, | |
958 | u64 owner, u32 extra_size) | |
7bb86316 | 959 | { |
5d4f98a2 YZ |
960 | struct btrfs_extent_item *item; |
961 | struct btrfs_extent_item_v0 *ei0; | |
962 | struct btrfs_extent_ref_v0 *ref0; | |
963 | struct btrfs_tree_block_info *bi; | |
964 | struct extent_buffer *leaf; | |
7bb86316 | 965 | struct btrfs_key key; |
5d4f98a2 YZ |
966 | struct btrfs_key found_key; |
967 | u32 new_size = sizeof(*item); | |
968 | u64 refs; | |
969 | int ret; | |
970 | ||
971 | leaf = path->nodes[0]; | |
972 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
973 | ||
974 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
975 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
976 | struct btrfs_extent_item_v0); | |
977 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
978 | ||
979 | if (owner == (u64)-1) { | |
980 | while (1) { | |
981 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
982 | ret = btrfs_next_leaf(root, path); | |
983 | if (ret < 0) | |
984 | return ret; | |
985 | BUG_ON(ret > 0); | |
986 | leaf = path->nodes[0]; | |
987 | } | |
988 | btrfs_item_key_to_cpu(leaf, &found_key, | |
989 | path->slots[0]); | |
990 | BUG_ON(key.objectid != found_key.objectid); | |
991 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
992 | path->slots[0]++; | |
993 | continue; | |
994 | } | |
995 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
996 | struct btrfs_extent_ref_v0); | |
997 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
998 | break; | |
999 | } | |
1000 | } | |
b3b4aa74 | 1001 | btrfs_release_path(path); |
5d4f98a2 YZ |
1002 | |
1003 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1004 | new_size += sizeof(*bi); | |
1005 | ||
1006 | new_size -= sizeof(*ei0); | |
1007 | ret = btrfs_search_slot(trans, root, &key, path, | |
1008 | new_size + extra_size, 1); | |
1009 | if (ret < 0) | |
1010 | return ret; | |
1011 | BUG_ON(ret); | |
1012 | ||
1013 | ret = btrfs_extend_item(trans, root, path, new_size); | |
5d4f98a2 YZ |
1014 | |
1015 | leaf = path->nodes[0]; | |
1016 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1017 | btrfs_set_extent_refs(leaf, item, refs); | |
1018 | /* FIXME: get real generation */ | |
1019 | btrfs_set_extent_generation(leaf, item, 0); | |
1020 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1021 | btrfs_set_extent_flags(leaf, item, | |
1022 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1023 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1024 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1025 | /* FIXME: get first key of the block */ | |
1026 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1027 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1028 | } else { | |
1029 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1030 | } | |
1031 | btrfs_mark_buffer_dirty(leaf); | |
1032 | return 0; | |
1033 | } | |
1034 | #endif | |
1035 | ||
1036 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1037 | { | |
1038 | u32 high_crc = ~(u32)0; | |
1039 | u32 low_crc = ~(u32)0; | |
1040 | __le64 lenum; | |
1041 | ||
1042 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1043 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1044 | lenum = cpu_to_le64(owner); |
163e783e | 1045 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1046 | lenum = cpu_to_le64(offset); |
163e783e | 1047 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1048 | |
1049 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1050 | } | |
1051 | ||
1052 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1053 | struct btrfs_extent_data_ref *ref) | |
1054 | { | |
1055 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1056 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1057 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1058 | } | |
1059 | ||
1060 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1061 | struct btrfs_extent_data_ref *ref, | |
1062 | u64 root_objectid, u64 owner, u64 offset) | |
1063 | { | |
1064 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1065 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1066 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1067 | return 0; | |
1068 | return 1; | |
1069 | } | |
1070 | ||
1071 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1072 | struct btrfs_root *root, | |
1073 | struct btrfs_path *path, | |
1074 | u64 bytenr, u64 parent, | |
1075 | u64 root_objectid, | |
1076 | u64 owner, u64 offset) | |
1077 | { | |
1078 | struct btrfs_key key; | |
1079 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1080 | struct extent_buffer *leaf; |
5d4f98a2 | 1081 | u32 nritems; |
74493f7a | 1082 | int ret; |
5d4f98a2 YZ |
1083 | int recow; |
1084 | int err = -ENOENT; | |
74493f7a | 1085 | |
31840ae1 | 1086 | key.objectid = bytenr; |
5d4f98a2 YZ |
1087 | if (parent) { |
1088 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1089 | key.offset = parent; | |
1090 | } else { | |
1091 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1092 | key.offset = hash_extent_data_ref(root_objectid, | |
1093 | owner, offset); | |
1094 | } | |
1095 | again: | |
1096 | recow = 0; | |
1097 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1098 | if (ret < 0) { | |
1099 | err = ret; | |
1100 | goto fail; | |
1101 | } | |
31840ae1 | 1102 | |
5d4f98a2 YZ |
1103 | if (parent) { |
1104 | if (!ret) | |
1105 | return 0; | |
1106 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1107 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1108 | btrfs_release_path(path); |
5d4f98a2 YZ |
1109 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1110 | if (ret < 0) { | |
1111 | err = ret; | |
1112 | goto fail; | |
1113 | } | |
1114 | if (!ret) | |
1115 | return 0; | |
1116 | #endif | |
1117 | goto fail; | |
31840ae1 ZY |
1118 | } |
1119 | ||
1120 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1121 | nritems = btrfs_header_nritems(leaf); |
1122 | while (1) { | |
1123 | if (path->slots[0] >= nritems) { | |
1124 | ret = btrfs_next_leaf(root, path); | |
1125 | if (ret < 0) | |
1126 | err = ret; | |
1127 | if (ret) | |
1128 | goto fail; | |
1129 | ||
1130 | leaf = path->nodes[0]; | |
1131 | nritems = btrfs_header_nritems(leaf); | |
1132 | recow = 1; | |
1133 | } | |
1134 | ||
1135 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1136 | if (key.objectid != bytenr || | |
1137 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1138 | goto fail; | |
1139 | ||
1140 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1141 | struct btrfs_extent_data_ref); | |
1142 | ||
1143 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1144 | owner, offset)) { | |
1145 | if (recow) { | |
b3b4aa74 | 1146 | btrfs_release_path(path); |
5d4f98a2 YZ |
1147 | goto again; |
1148 | } | |
1149 | err = 0; | |
1150 | break; | |
1151 | } | |
1152 | path->slots[0]++; | |
31840ae1 | 1153 | } |
5d4f98a2 YZ |
1154 | fail: |
1155 | return err; | |
31840ae1 ZY |
1156 | } |
1157 | ||
5d4f98a2 YZ |
1158 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1159 | struct btrfs_root *root, | |
1160 | struct btrfs_path *path, | |
1161 | u64 bytenr, u64 parent, | |
1162 | u64 root_objectid, u64 owner, | |
1163 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1164 | { |
1165 | struct btrfs_key key; | |
1166 | struct extent_buffer *leaf; | |
5d4f98a2 | 1167 | u32 size; |
31840ae1 ZY |
1168 | u32 num_refs; |
1169 | int ret; | |
74493f7a | 1170 | |
74493f7a | 1171 | key.objectid = bytenr; |
5d4f98a2 YZ |
1172 | if (parent) { |
1173 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1174 | key.offset = parent; | |
1175 | size = sizeof(struct btrfs_shared_data_ref); | |
1176 | } else { | |
1177 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1178 | key.offset = hash_extent_data_ref(root_objectid, | |
1179 | owner, offset); | |
1180 | size = sizeof(struct btrfs_extent_data_ref); | |
1181 | } | |
74493f7a | 1182 | |
5d4f98a2 YZ |
1183 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1184 | if (ret && ret != -EEXIST) | |
1185 | goto fail; | |
1186 | ||
1187 | leaf = path->nodes[0]; | |
1188 | if (parent) { | |
1189 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1190 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1191 | struct btrfs_shared_data_ref); |
1192 | if (ret == 0) { | |
1193 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1194 | } else { | |
1195 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1196 | num_refs += refs_to_add; | |
1197 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1198 | } |
5d4f98a2 YZ |
1199 | } else { |
1200 | struct btrfs_extent_data_ref *ref; | |
1201 | while (ret == -EEXIST) { | |
1202 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1203 | struct btrfs_extent_data_ref); | |
1204 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1205 | owner, offset)) | |
1206 | break; | |
b3b4aa74 | 1207 | btrfs_release_path(path); |
5d4f98a2 YZ |
1208 | key.offset++; |
1209 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1210 | size); | |
1211 | if (ret && ret != -EEXIST) | |
1212 | goto fail; | |
31840ae1 | 1213 | |
5d4f98a2 YZ |
1214 | leaf = path->nodes[0]; |
1215 | } | |
1216 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1217 | struct btrfs_extent_data_ref); | |
1218 | if (ret == 0) { | |
1219 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1220 | root_objectid); | |
1221 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1222 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1223 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1224 | } else { | |
1225 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1226 | num_refs += refs_to_add; | |
1227 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1228 | } |
31840ae1 | 1229 | } |
5d4f98a2 YZ |
1230 | btrfs_mark_buffer_dirty(leaf); |
1231 | ret = 0; | |
1232 | fail: | |
b3b4aa74 | 1233 | btrfs_release_path(path); |
7bb86316 | 1234 | return ret; |
74493f7a CM |
1235 | } |
1236 | ||
5d4f98a2 YZ |
1237 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1238 | struct btrfs_root *root, | |
1239 | struct btrfs_path *path, | |
1240 | int refs_to_drop) | |
31840ae1 | 1241 | { |
5d4f98a2 YZ |
1242 | struct btrfs_key key; |
1243 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1244 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1245 | struct extent_buffer *leaf; |
5d4f98a2 | 1246 | u32 num_refs = 0; |
31840ae1 ZY |
1247 | int ret = 0; |
1248 | ||
1249 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1250 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1251 | ||
1252 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1253 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1254 | struct btrfs_extent_data_ref); | |
1255 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1256 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1257 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1258 | struct btrfs_shared_data_ref); | |
1259 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1260 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1261 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1262 | struct btrfs_extent_ref_v0 *ref0; | |
1263 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1264 | struct btrfs_extent_ref_v0); | |
1265 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1266 | #endif | |
1267 | } else { | |
1268 | BUG(); | |
1269 | } | |
1270 | ||
56bec294 CM |
1271 | BUG_ON(num_refs < refs_to_drop); |
1272 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1273 | |
31840ae1 ZY |
1274 | if (num_refs == 0) { |
1275 | ret = btrfs_del_item(trans, root, path); | |
1276 | } else { | |
5d4f98a2 YZ |
1277 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1278 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1279 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1280 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1281 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1282 | else { | |
1283 | struct btrfs_extent_ref_v0 *ref0; | |
1284 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1285 | struct btrfs_extent_ref_v0); | |
1286 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1287 | } | |
1288 | #endif | |
31840ae1 ZY |
1289 | btrfs_mark_buffer_dirty(leaf); |
1290 | } | |
31840ae1 ZY |
1291 | return ret; |
1292 | } | |
1293 | ||
5d4f98a2 YZ |
1294 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1295 | struct btrfs_path *path, | |
1296 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1297 | { |
5d4f98a2 YZ |
1298 | struct btrfs_key key; |
1299 | struct extent_buffer *leaf; | |
1300 | struct btrfs_extent_data_ref *ref1; | |
1301 | struct btrfs_shared_data_ref *ref2; | |
1302 | u32 num_refs = 0; | |
1303 | ||
1304 | leaf = path->nodes[0]; | |
1305 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1306 | if (iref) { | |
1307 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1308 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1309 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1310 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1311 | } else { | |
1312 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1313 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1314 | } | |
1315 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1316 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1317 | struct btrfs_extent_data_ref); | |
1318 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1319 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1320 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1321 | struct btrfs_shared_data_ref); | |
1322 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1323 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1324 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1325 | struct btrfs_extent_ref_v0 *ref0; | |
1326 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1327 | struct btrfs_extent_ref_v0); | |
1328 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1329 | #endif |
5d4f98a2 YZ |
1330 | } else { |
1331 | WARN_ON(1); | |
1332 | } | |
1333 | return num_refs; | |
1334 | } | |
15916de8 | 1335 | |
5d4f98a2 YZ |
1336 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1337 | struct btrfs_root *root, | |
1338 | struct btrfs_path *path, | |
1339 | u64 bytenr, u64 parent, | |
1340 | u64 root_objectid) | |
1f3c79a2 | 1341 | { |
5d4f98a2 | 1342 | struct btrfs_key key; |
1f3c79a2 | 1343 | int ret; |
1f3c79a2 | 1344 | |
5d4f98a2 YZ |
1345 | key.objectid = bytenr; |
1346 | if (parent) { | |
1347 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1348 | key.offset = parent; | |
1349 | } else { | |
1350 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1351 | key.offset = root_objectid; | |
1f3c79a2 LH |
1352 | } |
1353 | ||
5d4f98a2 YZ |
1354 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1355 | if (ret > 0) | |
1356 | ret = -ENOENT; | |
1357 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1358 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1359 | btrfs_release_path(path); |
5d4f98a2 YZ |
1360 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1361 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1362 | if (ret > 0) | |
1363 | ret = -ENOENT; | |
1364 | } | |
1f3c79a2 | 1365 | #endif |
5d4f98a2 | 1366 | return ret; |
1f3c79a2 LH |
1367 | } |
1368 | ||
5d4f98a2 YZ |
1369 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1370 | struct btrfs_root *root, | |
1371 | struct btrfs_path *path, | |
1372 | u64 bytenr, u64 parent, | |
1373 | u64 root_objectid) | |
31840ae1 | 1374 | { |
5d4f98a2 | 1375 | struct btrfs_key key; |
31840ae1 | 1376 | int ret; |
31840ae1 | 1377 | |
5d4f98a2 YZ |
1378 | key.objectid = bytenr; |
1379 | if (parent) { | |
1380 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1381 | key.offset = parent; | |
1382 | } else { | |
1383 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1384 | key.offset = root_objectid; | |
1385 | } | |
1386 | ||
1387 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1388 | btrfs_release_path(path); |
31840ae1 ZY |
1389 | return ret; |
1390 | } | |
1391 | ||
5d4f98a2 | 1392 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1393 | { |
5d4f98a2 YZ |
1394 | int type; |
1395 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1396 | if (parent > 0) | |
1397 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1398 | else | |
1399 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1400 | } else { | |
1401 | if (parent > 0) | |
1402 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1403 | else | |
1404 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1405 | } | |
1406 | return type; | |
31840ae1 | 1407 | } |
56bec294 | 1408 | |
2c47e605 YZ |
1409 | static int find_next_key(struct btrfs_path *path, int level, |
1410 | struct btrfs_key *key) | |
56bec294 | 1411 | |
02217ed2 | 1412 | { |
2c47e605 | 1413 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1414 | if (!path->nodes[level]) |
1415 | break; | |
5d4f98a2 YZ |
1416 | if (path->slots[level] + 1 >= |
1417 | btrfs_header_nritems(path->nodes[level])) | |
1418 | continue; | |
1419 | if (level == 0) | |
1420 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1421 | path->slots[level] + 1); | |
1422 | else | |
1423 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1424 | path->slots[level] + 1); | |
1425 | return 0; | |
1426 | } | |
1427 | return 1; | |
1428 | } | |
037e6390 | 1429 | |
5d4f98a2 YZ |
1430 | /* |
1431 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1432 | * to the address of inline back ref, and 0 is returned. | |
1433 | * | |
1434 | * if back ref isn't found, *ref_ret is set to the address where it | |
1435 | * should be inserted, and -ENOENT is returned. | |
1436 | * | |
1437 | * if insert is true and there are too many inline back refs, the path | |
1438 | * points to the extent item, and -EAGAIN is returned. | |
1439 | * | |
1440 | * NOTE: inline back refs are ordered in the same way that back ref | |
1441 | * items in the tree are ordered. | |
1442 | */ | |
1443 | static noinline_for_stack | |
1444 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1445 | struct btrfs_root *root, | |
1446 | struct btrfs_path *path, | |
1447 | struct btrfs_extent_inline_ref **ref_ret, | |
1448 | u64 bytenr, u64 num_bytes, | |
1449 | u64 parent, u64 root_objectid, | |
1450 | u64 owner, u64 offset, int insert) | |
1451 | { | |
1452 | struct btrfs_key key; | |
1453 | struct extent_buffer *leaf; | |
1454 | struct btrfs_extent_item *ei; | |
1455 | struct btrfs_extent_inline_ref *iref; | |
1456 | u64 flags; | |
1457 | u64 item_size; | |
1458 | unsigned long ptr; | |
1459 | unsigned long end; | |
1460 | int extra_size; | |
1461 | int type; | |
1462 | int want; | |
1463 | int ret; | |
1464 | int err = 0; | |
26b8003f | 1465 | |
db94535d | 1466 | key.objectid = bytenr; |
31840ae1 | 1467 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1468 | key.offset = num_bytes; |
31840ae1 | 1469 | |
5d4f98a2 YZ |
1470 | want = extent_ref_type(parent, owner); |
1471 | if (insert) { | |
1472 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1473 | path->keep_locks = 1; |
5d4f98a2 YZ |
1474 | } else |
1475 | extra_size = -1; | |
1476 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1477 | if (ret < 0) { |
5d4f98a2 YZ |
1478 | err = ret; |
1479 | goto out; | |
1480 | } | |
1481 | BUG_ON(ret); | |
1482 | ||
1483 | leaf = path->nodes[0]; | |
1484 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1485 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1486 | if (item_size < sizeof(*ei)) { | |
1487 | if (!insert) { | |
1488 | err = -ENOENT; | |
1489 | goto out; | |
1490 | } | |
1491 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1492 | extra_size); | |
1493 | if (ret < 0) { | |
1494 | err = ret; | |
1495 | goto out; | |
1496 | } | |
1497 | leaf = path->nodes[0]; | |
1498 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1499 | } | |
1500 | #endif | |
1501 | BUG_ON(item_size < sizeof(*ei)); | |
1502 | ||
5d4f98a2 YZ |
1503 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1504 | flags = btrfs_extent_flags(leaf, ei); | |
1505 | ||
1506 | ptr = (unsigned long)(ei + 1); | |
1507 | end = (unsigned long)ei + item_size; | |
1508 | ||
1509 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1510 | ptr += sizeof(struct btrfs_tree_block_info); | |
1511 | BUG_ON(ptr > end); | |
1512 | } else { | |
1513 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1514 | } | |
1515 | ||
1516 | err = -ENOENT; | |
1517 | while (1) { | |
1518 | if (ptr >= end) { | |
1519 | WARN_ON(ptr > end); | |
1520 | break; | |
1521 | } | |
1522 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1523 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1524 | if (want < type) | |
1525 | break; | |
1526 | if (want > type) { | |
1527 | ptr += btrfs_extent_inline_ref_size(type); | |
1528 | continue; | |
1529 | } | |
1530 | ||
1531 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1532 | struct btrfs_extent_data_ref *dref; | |
1533 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1534 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1535 | owner, offset)) { | |
1536 | err = 0; | |
1537 | break; | |
1538 | } | |
1539 | if (hash_extent_data_ref_item(leaf, dref) < | |
1540 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1541 | break; | |
1542 | } else { | |
1543 | u64 ref_offset; | |
1544 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1545 | if (parent > 0) { | |
1546 | if (parent == ref_offset) { | |
1547 | err = 0; | |
1548 | break; | |
1549 | } | |
1550 | if (ref_offset < parent) | |
1551 | break; | |
1552 | } else { | |
1553 | if (root_objectid == ref_offset) { | |
1554 | err = 0; | |
1555 | break; | |
1556 | } | |
1557 | if (ref_offset < root_objectid) | |
1558 | break; | |
1559 | } | |
1560 | } | |
1561 | ptr += btrfs_extent_inline_ref_size(type); | |
1562 | } | |
1563 | if (err == -ENOENT && insert) { | |
1564 | if (item_size + extra_size >= | |
1565 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1566 | err = -EAGAIN; | |
1567 | goto out; | |
1568 | } | |
1569 | /* | |
1570 | * To add new inline back ref, we have to make sure | |
1571 | * there is no corresponding back ref item. | |
1572 | * For simplicity, we just do not add new inline back | |
1573 | * ref if there is any kind of item for this block | |
1574 | */ | |
2c47e605 YZ |
1575 | if (find_next_key(path, 0, &key) == 0 && |
1576 | key.objectid == bytenr && | |
85d4198e | 1577 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1578 | err = -EAGAIN; |
1579 | goto out; | |
1580 | } | |
1581 | } | |
1582 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1583 | out: | |
85d4198e | 1584 | if (insert) { |
5d4f98a2 YZ |
1585 | path->keep_locks = 0; |
1586 | btrfs_unlock_up_safe(path, 1); | |
1587 | } | |
1588 | return err; | |
1589 | } | |
1590 | ||
1591 | /* | |
1592 | * helper to add new inline back ref | |
1593 | */ | |
1594 | static noinline_for_stack | |
1595 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1596 | struct btrfs_root *root, | |
1597 | struct btrfs_path *path, | |
1598 | struct btrfs_extent_inline_ref *iref, | |
1599 | u64 parent, u64 root_objectid, | |
1600 | u64 owner, u64 offset, int refs_to_add, | |
1601 | struct btrfs_delayed_extent_op *extent_op) | |
1602 | { | |
1603 | struct extent_buffer *leaf; | |
1604 | struct btrfs_extent_item *ei; | |
1605 | unsigned long ptr; | |
1606 | unsigned long end; | |
1607 | unsigned long item_offset; | |
1608 | u64 refs; | |
1609 | int size; | |
1610 | int type; | |
1611 | int ret; | |
1612 | ||
1613 | leaf = path->nodes[0]; | |
1614 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1615 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1616 | ||
1617 | type = extent_ref_type(parent, owner); | |
1618 | size = btrfs_extent_inline_ref_size(type); | |
1619 | ||
1620 | ret = btrfs_extend_item(trans, root, path, size); | |
5d4f98a2 YZ |
1621 | |
1622 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1623 | refs = btrfs_extent_refs(leaf, ei); | |
1624 | refs += refs_to_add; | |
1625 | btrfs_set_extent_refs(leaf, ei, refs); | |
1626 | if (extent_op) | |
1627 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1628 | ||
1629 | ptr = (unsigned long)ei + item_offset; | |
1630 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1631 | if (ptr < end - size) | |
1632 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1633 | end - size - ptr); | |
1634 | ||
1635 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1636 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1637 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1638 | struct btrfs_extent_data_ref *dref; | |
1639 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1640 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1641 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1642 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1643 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1644 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1645 | struct btrfs_shared_data_ref *sref; | |
1646 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1647 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1648 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1649 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1650 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1651 | } else { | |
1652 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1653 | } | |
1654 | btrfs_mark_buffer_dirty(leaf); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1659 | struct btrfs_root *root, | |
1660 | struct btrfs_path *path, | |
1661 | struct btrfs_extent_inline_ref **ref_ret, | |
1662 | u64 bytenr, u64 num_bytes, u64 parent, | |
1663 | u64 root_objectid, u64 owner, u64 offset) | |
1664 | { | |
1665 | int ret; | |
1666 | ||
1667 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1668 | bytenr, num_bytes, parent, | |
1669 | root_objectid, owner, offset, 0); | |
1670 | if (ret != -ENOENT) | |
54aa1f4d | 1671 | return ret; |
5d4f98a2 | 1672 | |
b3b4aa74 | 1673 | btrfs_release_path(path); |
5d4f98a2 YZ |
1674 | *ref_ret = NULL; |
1675 | ||
1676 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1677 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1678 | root_objectid); | |
1679 | } else { | |
1680 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1681 | root_objectid, owner, offset); | |
b9473439 | 1682 | } |
5d4f98a2 YZ |
1683 | return ret; |
1684 | } | |
31840ae1 | 1685 | |
5d4f98a2 YZ |
1686 | /* |
1687 | * helper to update/remove inline back ref | |
1688 | */ | |
1689 | static noinline_for_stack | |
1690 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1691 | struct btrfs_root *root, | |
1692 | struct btrfs_path *path, | |
1693 | struct btrfs_extent_inline_ref *iref, | |
1694 | int refs_to_mod, | |
1695 | struct btrfs_delayed_extent_op *extent_op) | |
1696 | { | |
1697 | struct extent_buffer *leaf; | |
1698 | struct btrfs_extent_item *ei; | |
1699 | struct btrfs_extent_data_ref *dref = NULL; | |
1700 | struct btrfs_shared_data_ref *sref = NULL; | |
1701 | unsigned long ptr; | |
1702 | unsigned long end; | |
1703 | u32 item_size; | |
1704 | int size; | |
1705 | int type; | |
1706 | int ret; | |
1707 | u64 refs; | |
1708 | ||
1709 | leaf = path->nodes[0]; | |
1710 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1711 | refs = btrfs_extent_refs(leaf, ei); | |
1712 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1713 | refs += refs_to_mod; | |
1714 | btrfs_set_extent_refs(leaf, ei, refs); | |
1715 | if (extent_op) | |
1716 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1717 | ||
1718 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1719 | ||
1720 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1721 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1722 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1723 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1724 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1725 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1726 | } else { | |
1727 | refs = 1; | |
1728 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1729 | } |
31840ae1 | 1730 | |
5d4f98a2 YZ |
1731 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1732 | refs += refs_to_mod; | |
1733 | ||
1734 | if (refs > 0) { | |
1735 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1736 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1737 | else | |
1738 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1739 | } else { | |
1740 | size = btrfs_extent_inline_ref_size(type); | |
1741 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1742 | ptr = (unsigned long)iref; | |
1743 | end = (unsigned long)ei + item_size; | |
1744 | if (ptr + size < end) | |
1745 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1746 | end - ptr - size); | |
1747 | item_size -= size; | |
1748 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
5d4f98a2 YZ |
1749 | } |
1750 | btrfs_mark_buffer_dirty(leaf); | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | static noinline_for_stack | |
1755 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1756 | struct btrfs_root *root, | |
1757 | struct btrfs_path *path, | |
1758 | u64 bytenr, u64 num_bytes, u64 parent, | |
1759 | u64 root_objectid, u64 owner, | |
1760 | u64 offset, int refs_to_add, | |
1761 | struct btrfs_delayed_extent_op *extent_op) | |
1762 | { | |
1763 | struct btrfs_extent_inline_ref *iref; | |
1764 | int ret; | |
1765 | ||
1766 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1767 | bytenr, num_bytes, parent, | |
1768 | root_objectid, owner, offset, 1); | |
1769 | if (ret == 0) { | |
1770 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1771 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1772 | refs_to_add, extent_op); | |
1773 | } else if (ret == -ENOENT) { | |
1774 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1775 | parent, root_objectid, | |
1776 | owner, offset, refs_to_add, | |
1777 | extent_op); | |
771ed689 | 1778 | } |
5d4f98a2 YZ |
1779 | return ret; |
1780 | } | |
31840ae1 | 1781 | |
5d4f98a2 YZ |
1782 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1783 | struct btrfs_root *root, | |
1784 | struct btrfs_path *path, | |
1785 | u64 bytenr, u64 parent, u64 root_objectid, | |
1786 | u64 owner, u64 offset, int refs_to_add) | |
1787 | { | |
1788 | int ret; | |
1789 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1790 | BUG_ON(refs_to_add != 1); | |
1791 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1792 | parent, root_objectid); | |
1793 | } else { | |
1794 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1795 | parent, root_objectid, | |
1796 | owner, offset, refs_to_add); | |
1797 | } | |
1798 | return ret; | |
1799 | } | |
56bec294 | 1800 | |
5d4f98a2 YZ |
1801 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1802 | struct btrfs_root *root, | |
1803 | struct btrfs_path *path, | |
1804 | struct btrfs_extent_inline_ref *iref, | |
1805 | int refs_to_drop, int is_data) | |
1806 | { | |
1807 | int ret; | |
b9473439 | 1808 | |
5d4f98a2 YZ |
1809 | BUG_ON(!is_data && refs_to_drop != 1); |
1810 | if (iref) { | |
1811 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1812 | -refs_to_drop, NULL); | |
1813 | } else if (is_data) { | |
1814 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1815 | } else { | |
1816 | ret = btrfs_del_item(trans, root, path); | |
1817 | } | |
1818 | return ret; | |
1819 | } | |
1820 | ||
5378e607 | 1821 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1822 | u64 start, u64 len) |
1823 | { | |
5378e607 | 1824 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1825 | } |
5d4f98a2 YZ |
1826 | |
1827 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1828 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1829 | { |
5d4f98a2 | 1830 | int ret; |
5378e607 | 1831 | u64 discarded_bytes = 0; |
a1d3c478 | 1832 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1833 | |
e244a0ae | 1834 | |
5d4f98a2 | 1835 | /* Tell the block device(s) that the sectors can be discarded */ |
5378e607 | 1836 | ret = btrfs_map_block(&root->fs_info->mapping_tree, REQ_DISCARD, |
a1d3c478 | 1837 | bytenr, &num_bytes, &bbio, 0); |
5d4f98a2 | 1838 | if (!ret) { |
a1d3c478 | 1839 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1840 | int i; |
1841 | ||
5d4f98a2 | 1842 | |
a1d3c478 | 1843 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1844 | if (!stripe->dev->can_discard) |
1845 | continue; | |
1846 | ||
5378e607 LD |
1847 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1848 | stripe->physical, | |
1849 | stripe->length); | |
1850 | if (!ret) | |
1851 | discarded_bytes += stripe->length; | |
1852 | else if (ret != -EOPNOTSUPP) | |
1853 | break; | |
d5e2003c JB |
1854 | |
1855 | /* | |
1856 | * Just in case we get back EOPNOTSUPP for some reason, | |
1857 | * just ignore the return value so we don't screw up | |
1858 | * people calling discard_extent. | |
1859 | */ | |
1860 | ret = 0; | |
5d4f98a2 | 1861 | } |
a1d3c478 | 1862 | kfree(bbio); |
5d4f98a2 | 1863 | } |
5378e607 LD |
1864 | |
1865 | if (actual_bytes) | |
1866 | *actual_bytes = discarded_bytes; | |
1867 | ||
5d4f98a2 YZ |
1868 | |
1869 | return ret; | |
5d4f98a2 YZ |
1870 | } |
1871 | ||
1872 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1873 | struct btrfs_root *root, | |
1874 | u64 bytenr, u64 num_bytes, u64 parent, | |
1875 | u64 root_objectid, u64 owner, u64 offset) | |
1876 | { | |
1877 | int ret; | |
1878 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1879 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1880 | ||
1881 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1882 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1883 | parent, root_objectid, (int)owner, | |
1884 | BTRFS_ADD_DELAYED_REF, NULL); | |
1885 | } else { | |
1886 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1887 | parent, root_objectid, owner, offset, | |
1888 | BTRFS_ADD_DELAYED_REF, NULL); | |
1889 | } | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1893 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1894 | struct btrfs_root *root, | |
1895 | u64 bytenr, u64 num_bytes, | |
1896 | u64 parent, u64 root_objectid, | |
1897 | u64 owner, u64 offset, int refs_to_add, | |
1898 | struct btrfs_delayed_extent_op *extent_op) | |
1899 | { | |
1900 | struct btrfs_path *path; | |
1901 | struct extent_buffer *leaf; | |
1902 | struct btrfs_extent_item *item; | |
1903 | u64 refs; | |
1904 | int ret; | |
1905 | int err = 0; | |
1906 | ||
1907 | path = btrfs_alloc_path(); | |
1908 | if (!path) | |
1909 | return -ENOMEM; | |
1910 | ||
1911 | path->reada = 1; | |
1912 | path->leave_spinning = 1; | |
1913 | /* this will setup the path even if it fails to insert the back ref */ | |
1914 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1915 | path, bytenr, num_bytes, parent, | |
1916 | root_objectid, owner, offset, | |
1917 | refs_to_add, extent_op); | |
1918 | if (ret == 0) | |
1919 | goto out; | |
1920 | ||
1921 | if (ret != -EAGAIN) { | |
1922 | err = ret; | |
1923 | goto out; | |
1924 | } | |
1925 | ||
1926 | leaf = path->nodes[0]; | |
1927 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1928 | refs = btrfs_extent_refs(leaf, item); | |
1929 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1930 | if (extent_op) | |
1931 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1932 | |
5d4f98a2 | 1933 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1934 | btrfs_release_path(path); |
56bec294 CM |
1935 | |
1936 | path->reada = 1; | |
b9473439 CM |
1937 | path->leave_spinning = 1; |
1938 | ||
56bec294 CM |
1939 | /* now insert the actual backref */ |
1940 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1941 | path, bytenr, parent, root_objectid, |
1942 | owner, offset, refs_to_add); | |
56bec294 | 1943 | BUG_ON(ret); |
5d4f98a2 | 1944 | out: |
56bec294 | 1945 | btrfs_free_path(path); |
5d4f98a2 | 1946 | return err; |
56bec294 CM |
1947 | } |
1948 | ||
5d4f98a2 YZ |
1949 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1950 | struct btrfs_root *root, | |
1951 | struct btrfs_delayed_ref_node *node, | |
1952 | struct btrfs_delayed_extent_op *extent_op, | |
1953 | int insert_reserved) | |
56bec294 | 1954 | { |
5d4f98a2 YZ |
1955 | int ret = 0; |
1956 | struct btrfs_delayed_data_ref *ref; | |
1957 | struct btrfs_key ins; | |
1958 | u64 parent = 0; | |
1959 | u64 ref_root = 0; | |
1960 | u64 flags = 0; | |
1961 | ||
1962 | ins.objectid = node->bytenr; | |
1963 | ins.offset = node->num_bytes; | |
1964 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1965 | ||
1966 | ref = btrfs_delayed_node_to_data_ref(node); | |
1967 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1968 | parent = ref->parent; | |
1969 | else | |
1970 | ref_root = ref->root; | |
1971 | ||
1972 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1973 | if (extent_op) { | |
1974 | BUG_ON(extent_op->update_key); | |
1975 | flags |= extent_op->flags_to_set; | |
1976 | } | |
1977 | ret = alloc_reserved_file_extent(trans, root, | |
1978 | parent, ref_root, flags, | |
1979 | ref->objectid, ref->offset, | |
1980 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1981 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1982 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1983 | node->num_bytes, parent, | |
1984 | ref_root, ref->objectid, | |
1985 | ref->offset, node->ref_mod, | |
1986 | extent_op); | |
1987 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1988 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1989 | node->num_bytes, parent, | |
1990 | ref_root, ref->objectid, | |
1991 | ref->offset, node->ref_mod, | |
1992 | extent_op); | |
1993 | } else { | |
1994 | BUG(); | |
1995 | } | |
1996 | return ret; | |
1997 | } | |
1998 | ||
1999 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2000 | struct extent_buffer *leaf, | |
2001 | struct btrfs_extent_item *ei) | |
2002 | { | |
2003 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2004 | if (extent_op->update_flags) { | |
2005 | flags |= extent_op->flags_to_set; | |
2006 | btrfs_set_extent_flags(leaf, ei, flags); | |
2007 | } | |
2008 | ||
2009 | if (extent_op->update_key) { | |
2010 | struct btrfs_tree_block_info *bi; | |
2011 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2012 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2013 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2014 | } | |
2015 | } | |
2016 | ||
2017 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2018 | struct btrfs_root *root, | |
2019 | struct btrfs_delayed_ref_node *node, | |
2020 | struct btrfs_delayed_extent_op *extent_op) | |
2021 | { | |
2022 | struct btrfs_key key; | |
2023 | struct btrfs_path *path; | |
2024 | struct btrfs_extent_item *ei; | |
2025 | struct extent_buffer *leaf; | |
2026 | u32 item_size; | |
56bec294 | 2027 | int ret; |
5d4f98a2 YZ |
2028 | int err = 0; |
2029 | ||
2030 | path = btrfs_alloc_path(); | |
2031 | if (!path) | |
2032 | return -ENOMEM; | |
2033 | ||
2034 | key.objectid = node->bytenr; | |
2035 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2036 | key.offset = node->num_bytes; | |
2037 | ||
2038 | path->reada = 1; | |
2039 | path->leave_spinning = 1; | |
2040 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2041 | path, 0, 1); | |
2042 | if (ret < 0) { | |
2043 | err = ret; | |
2044 | goto out; | |
2045 | } | |
2046 | if (ret > 0) { | |
2047 | err = -EIO; | |
2048 | goto out; | |
2049 | } | |
2050 | ||
2051 | leaf = path->nodes[0]; | |
2052 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2053 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2054 | if (item_size < sizeof(*ei)) { | |
2055 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2056 | path, (u64)-1, 0); | |
2057 | if (ret < 0) { | |
2058 | err = ret; | |
2059 | goto out; | |
2060 | } | |
2061 | leaf = path->nodes[0]; | |
2062 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2063 | } | |
2064 | #endif | |
2065 | BUG_ON(item_size < sizeof(*ei)); | |
2066 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2067 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2068 | |
5d4f98a2 YZ |
2069 | btrfs_mark_buffer_dirty(leaf); |
2070 | out: | |
2071 | btrfs_free_path(path); | |
2072 | return err; | |
56bec294 CM |
2073 | } |
2074 | ||
5d4f98a2 YZ |
2075 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2076 | struct btrfs_root *root, | |
2077 | struct btrfs_delayed_ref_node *node, | |
2078 | struct btrfs_delayed_extent_op *extent_op, | |
2079 | int insert_reserved) | |
56bec294 CM |
2080 | { |
2081 | int ret = 0; | |
5d4f98a2 YZ |
2082 | struct btrfs_delayed_tree_ref *ref; |
2083 | struct btrfs_key ins; | |
2084 | u64 parent = 0; | |
2085 | u64 ref_root = 0; | |
56bec294 | 2086 | |
5d4f98a2 YZ |
2087 | ins.objectid = node->bytenr; |
2088 | ins.offset = node->num_bytes; | |
2089 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2090 | |
5d4f98a2 YZ |
2091 | ref = btrfs_delayed_node_to_tree_ref(node); |
2092 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2093 | parent = ref->parent; | |
2094 | else | |
2095 | ref_root = ref->root; | |
2096 | ||
2097 | BUG_ON(node->ref_mod != 1); | |
2098 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2099 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2100 | !extent_op->update_key); | |
2101 | ret = alloc_reserved_tree_block(trans, root, | |
2102 | parent, ref_root, | |
2103 | extent_op->flags_to_set, | |
2104 | &extent_op->key, | |
2105 | ref->level, &ins); | |
5d4f98a2 YZ |
2106 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2107 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2108 | node->num_bytes, parent, ref_root, | |
2109 | ref->level, 0, 1, extent_op); | |
2110 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2111 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2112 | node->num_bytes, parent, ref_root, | |
2113 | ref->level, 0, 1, extent_op); | |
2114 | } else { | |
2115 | BUG(); | |
2116 | } | |
56bec294 CM |
2117 | return ret; |
2118 | } | |
2119 | ||
2120 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2121 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2122 | struct btrfs_root *root, | |
2123 | struct btrfs_delayed_ref_node *node, | |
2124 | struct btrfs_delayed_extent_op *extent_op, | |
2125 | int insert_reserved) | |
56bec294 CM |
2126 | { |
2127 | int ret; | |
5d4f98a2 | 2128 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2129 | struct btrfs_delayed_ref_head *head; |
2130 | /* | |
2131 | * we've hit the end of the chain and we were supposed | |
2132 | * to insert this extent into the tree. But, it got | |
2133 | * deleted before we ever needed to insert it, so all | |
2134 | * we have to do is clean up the accounting | |
2135 | */ | |
5d4f98a2 YZ |
2136 | BUG_ON(extent_op); |
2137 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2138 | if (insert_reserved) { |
f0486c68 YZ |
2139 | btrfs_pin_extent(root, node->bytenr, |
2140 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2141 | if (head->is_data) { |
2142 | ret = btrfs_del_csums(trans, root, | |
2143 | node->bytenr, | |
2144 | node->num_bytes); | |
2145 | BUG_ON(ret); | |
2146 | } | |
56bec294 | 2147 | } |
56bec294 CM |
2148 | mutex_unlock(&head->mutex); |
2149 | return 0; | |
2150 | } | |
2151 | ||
5d4f98a2 YZ |
2152 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2153 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2154 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2155 | insert_reserved); | |
2156 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2157 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2158 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2159 | insert_reserved); | |
2160 | else | |
2161 | BUG(); | |
2162 | return ret; | |
56bec294 CM |
2163 | } |
2164 | ||
2165 | static noinline struct btrfs_delayed_ref_node * | |
2166 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2167 | { | |
2168 | struct rb_node *node; | |
2169 | struct btrfs_delayed_ref_node *ref; | |
2170 | int action = BTRFS_ADD_DELAYED_REF; | |
2171 | again: | |
2172 | /* | |
2173 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2174 | * this prevents ref count from going down to zero when | |
2175 | * there still are pending delayed ref. | |
2176 | */ | |
2177 | node = rb_prev(&head->node.rb_node); | |
2178 | while (1) { | |
2179 | if (!node) | |
2180 | break; | |
2181 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2182 | rb_node); | |
2183 | if (ref->bytenr != head->node.bytenr) | |
2184 | break; | |
5d4f98a2 | 2185 | if (ref->action == action) |
56bec294 CM |
2186 | return ref; |
2187 | node = rb_prev(node); | |
2188 | } | |
2189 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2190 | action = BTRFS_DROP_DELAYED_REF; | |
2191 | goto again; | |
2192 | } | |
2193 | return NULL; | |
2194 | } | |
2195 | ||
c3e69d58 CM |
2196 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2197 | struct btrfs_root *root, | |
2198 | struct list_head *cluster) | |
56bec294 | 2199 | { |
56bec294 CM |
2200 | struct btrfs_delayed_ref_root *delayed_refs; |
2201 | struct btrfs_delayed_ref_node *ref; | |
2202 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2203 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2204 | int ret; |
c3e69d58 | 2205 | int count = 0; |
56bec294 | 2206 | int must_insert_reserved = 0; |
56bec294 CM |
2207 | |
2208 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2209 | while (1) { |
2210 | if (!locked_ref) { | |
c3e69d58 CM |
2211 | /* pick a new head ref from the cluster list */ |
2212 | if (list_empty(cluster)) | |
56bec294 | 2213 | break; |
56bec294 | 2214 | |
c3e69d58 CM |
2215 | locked_ref = list_entry(cluster->next, |
2216 | struct btrfs_delayed_ref_head, cluster); | |
2217 | ||
2218 | /* grab the lock that says we are going to process | |
2219 | * all the refs for this head */ | |
2220 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2221 | ||
2222 | /* | |
2223 | * we may have dropped the spin lock to get the head | |
2224 | * mutex lock, and that might have given someone else | |
2225 | * time to free the head. If that's true, it has been | |
2226 | * removed from our list and we can move on. | |
2227 | */ | |
2228 | if (ret == -EAGAIN) { | |
2229 | locked_ref = NULL; | |
2230 | count++; | |
2231 | continue; | |
56bec294 CM |
2232 | } |
2233 | } | |
a28ec197 | 2234 | |
56bec294 CM |
2235 | /* |
2236 | * record the must insert reserved flag before we | |
2237 | * drop the spin lock. | |
2238 | */ | |
2239 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2240 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2241 | |
5d4f98a2 YZ |
2242 | extent_op = locked_ref->extent_op; |
2243 | locked_ref->extent_op = NULL; | |
2244 | ||
56bec294 CM |
2245 | /* |
2246 | * locked_ref is the head node, so we have to go one | |
2247 | * node back for any delayed ref updates | |
2248 | */ | |
56bec294 CM |
2249 | ref = select_delayed_ref(locked_ref); |
2250 | if (!ref) { | |
2251 | /* All delayed refs have been processed, Go ahead | |
2252 | * and send the head node to run_one_delayed_ref, | |
2253 | * so that any accounting fixes can happen | |
2254 | */ | |
2255 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2256 | |
2257 | if (extent_op && must_insert_reserved) { | |
2258 | kfree(extent_op); | |
2259 | extent_op = NULL; | |
2260 | } | |
2261 | ||
2262 | if (extent_op) { | |
2263 | spin_unlock(&delayed_refs->lock); | |
2264 | ||
2265 | ret = run_delayed_extent_op(trans, root, | |
2266 | ref, extent_op); | |
2267 | BUG_ON(ret); | |
2268 | kfree(extent_op); | |
2269 | ||
2270 | cond_resched(); | |
2271 | spin_lock(&delayed_refs->lock); | |
2272 | continue; | |
2273 | } | |
2274 | ||
c3e69d58 | 2275 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2276 | locked_ref = NULL; |
2277 | } | |
02217ed2 | 2278 | |
56bec294 CM |
2279 | ref->in_tree = 0; |
2280 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2281 | delayed_refs->num_entries--; | |
5d4f98a2 | 2282 | |
56bec294 | 2283 | spin_unlock(&delayed_refs->lock); |
925baedd | 2284 | |
5d4f98a2 | 2285 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2286 | must_insert_reserved); |
2287 | BUG_ON(ret); | |
eb099670 | 2288 | |
5d4f98a2 YZ |
2289 | btrfs_put_delayed_ref(ref); |
2290 | kfree(extent_op); | |
c3e69d58 | 2291 | count++; |
5d4f98a2 | 2292 | |
c3e69d58 CM |
2293 | cond_resched(); |
2294 | spin_lock(&delayed_refs->lock); | |
2295 | } | |
2296 | return count; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * this starts processing the delayed reference count updates and | |
2301 | * extent insertions we have queued up so far. count can be | |
2302 | * 0, which means to process everything in the tree at the start | |
2303 | * of the run (but not newly added entries), or it can be some target | |
2304 | * number you'd like to process. | |
2305 | */ | |
2306 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2307 | struct btrfs_root *root, unsigned long count) | |
2308 | { | |
2309 | struct rb_node *node; | |
2310 | struct btrfs_delayed_ref_root *delayed_refs; | |
2311 | struct btrfs_delayed_ref_node *ref; | |
2312 | struct list_head cluster; | |
2313 | int ret; | |
2314 | int run_all = count == (unsigned long)-1; | |
2315 | int run_most = 0; | |
2316 | ||
2317 | if (root == root->fs_info->extent_root) | |
2318 | root = root->fs_info->tree_root; | |
2319 | ||
2320 | delayed_refs = &trans->transaction->delayed_refs; | |
2321 | INIT_LIST_HEAD(&cluster); | |
2322 | again: | |
2323 | spin_lock(&delayed_refs->lock); | |
2324 | if (count == 0) { | |
2325 | count = delayed_refs->num_entries * 2; | |
2326 | run_most = 1; | |
2327 | } | |
2328 | while (1) { | |
2329 | if (!(run_all || run_most) && | |
2330 | delayed_refs->num_heads_ready < 64) | |
2331 | break; | |
eb099670 | 2332 | |
56bec294 | 2333 | /* |
c3e69d58 CM |
2334 | * go find something we can process in the rbtree. We start at |
2335 | * the beginning of the tree, and then build a cluster | |
2336 | * of refs to process starting at the first one we are able to | |
2337 | * lock | |
56bec294 | 2338 | */ |
c3e69d58 CM |
2339 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2340 | delayed_refs->run_delayed_start); | |
2341 | if (ret) | |
56bec294 CM |
2342 | break; |
2343 | ||
c3e69d58 CM |
2344 | ret = run_clustered_refs(trans, root, &cluster); |
2345 | BUG_ON(ret < 0); | |
2346 | ||
2347 | count -= min_t(unsigned long, ret, count); | |
2348 | ||
2349 | if (count == 0) | |
2350 | break; | |
eb099670 | 2351 | } |
c3e69d58 | 2352 | |
56bec294 | 2353 | if (run_all) { |
56bec294 | 2354 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2355 | if (!node) |
56bec294 | 2356 | goto out; |
c3e69d58 | 2357 | count = (unsigned long)-1; |
e9d0b13b | 2358 | |
56bec294 CM |
2359 | while (node) { |
2360 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2361 | rb_node); | |
2362 | if (btrfs_delayed_ref_is_head(ref)) { | |
2363 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2364 | |
56bec294 CM |
2365 | head = btrfs_delayed_node_to_head(ref); |
2366 | atomic_inc(&ref->refs); | |
2367 | ||
2368 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2369 | /* |
2370 | * Mutex was contended, block until it's | |
2371 | * released and try again | |
2372 | */ | |
56bec294 CM |
2373 | mutex_lock(&head->mutex); |
2374 | mutex_unlock(&head->mutex); | |
2375 | ||
2376 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2377 | cond_resched(); |
56bec294 CM |
2378 | goto again; |
2379 | } | |
2380 | node = rb_next(node); | |
2381 | } | |
2382 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2383 | schedule_timeout(1); |
2384 | goto again; | |
5f39d397 | 2385 | } |
54aa1f4d | 2386 | out: |
c3e69d58 | 2387 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2388 | return 0; |
2389 | } | |
2390 | ||
5d4f98a2 YZ |
2391 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2392 | struct btrfs_root *root, | |
2393 | u64 bytenr, u64 num_bytes, u64 flags, | |
2394 | int is_data) | |
2395 | { | |
2396 | struct btrfs_delayed_extent_op *extent_op; | |
2397 | int ret; | |
2398 | ||
2399 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2400 | if (!extent_op) | |
2401 | return -ENOMEM; | |
2402 | ||
2403 | extent_op->flags_to_set = flags; | |
2404 | extent_op->update_flags = 1; | |
2405 | extent_op->update_key = 0; | |
2406 | extent_op->is_data = is_data ? 1 : 0; | |
2407 | ||
2408 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2409 | if (ret) | |
2410 | kfree(extent_op); | |
2411 | return ret; | |
2412 | } | |
2413 | ||
2414 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2415 | struct btrfs_root *root, | |
2416 | struct btrfs_path *path, | |
2417 | u64 objectid, u64 offset, u64 bytenr) | |
2418 | { | |
2419 | struct btrfs_delayed_ref_head *head; | |
2420 | struct btrfs_delayed_ref_node *ref; | |
2421 | struct btrfs_delayed_data_ref *data_ref; | |
2422 | struct btrfs_delayed_ref_root *delayed_refs; | |
2423 | struct rb_node *node; | |
2424 | int ret = 0; | |
2425 | ||
2426 | ret = -ENOENT; | |
2427 | delayed_refs = &trans->transaction->delayed_refs; | |
2428 | spin_lock(&delayed_refs->lock); | |
2429 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2430 | if (!head) | |
2431 | goto out; | |
2432 | ||
2433 | if (!mutex_trylock(&head->mutex)) { | |
2434 | atomic_inc(&head->node.refs); | |
2435 | spin_unlock(&delayed_refs->lock); | |
2436 | ||
b3b4aa74 | 2437 | btrfs_release_path(path); |
5d4f98a2 | 2438 | |
8cc33e5c DS |
2439 | /* |
2440 | * Mutex was contended, block until it's released and let | |
2441 | * caller try again | |
2442 | */ | |
5d4f98a2 YZ |
2443 | mutex_lock(&head->mutex); |
2444 | mutex_unlock(&head->mutex); | |
2445 | btrfs_put_delayed_ref(&head->node); | |
2446 | return -EAGAIN; | |
2447 | } | |
2448 | ||
2449 | node = rb_prev(&head->node.rb_node); | |
2450 | if (!node) | |
2451 | goto out_unlock; | |
2452 | ||
2453 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2454 | ||
2455 | if (ref->bytenr != bytenr) | |
2456 | goto out_unlock; | |
2457 | ||
2458 | ret = 1; | |
2459 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2460 | goto out_unlock; | |
2461 | ||
2462 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2463 | ||
2464 | node = rb_prev(node); | |
2465 | if (node) { | |
2466 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2467 | if (ref->bytenr == bytenr) | |
2468 | goto out_unlock; | |
2469 | } | |
2470 | ||
2471 | if (data_ref->root != root->root_key.objectid || | |
2472 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2473 | goto out_unlock; | |
2474 | ||
2475 | ret = 0; | |
2476 | out_unlock: | |
2477 | mutex_unlock(&head->mutex); | |
2478 | out: | |
2479 | spin_unlock(&delayed_refs->lock); | |
2480 | return ret; | |
2481 | } | |
2482 | ||
2483 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2484 | struct btrfs_root *root, | |
2485 | struct btrfs_path *path, | |
2486 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2487 | { |
2488 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2489 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2490 | struct btrfs_extent_data_ref *ref; |
2491 | struct btrfs_extent_inline_ref *iref; | |
2492 | struct btrfs_extent_item *ei; | |
f321e491 | 2493 | struct btrfs_key key; |
5d4f98a2 | 2494 | u32 item_size; |
be20aa9d | 2495 | int ret; |
925baedd | 2496 | |
be20aa9d | 2497 | key.objectid = bytenr; |
31840ae1 | 2498 | key.offset = (u64)-1; |
f321e491 | 2499 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2500 | |
be20aa9d CM |
2501 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2502 | if (ret < 0) | |
2503 | goto out; | |
2504 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2505 | |
2506 | ret = -ENOENT; | |
2507 | if (path->slots[0] == 0) | |
31840ae1 | 2508 | goto out; |
be20aa9d | 2509 | |
31840ae1 | 2510 | path->slots[0]--; |
f321e491 | 2511 | leaf = path->nodes[0]; |
5d4f98a2 | 2512 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2513 | |
5d4f98a2 | 2514 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2515 | goto out; |
f321e491 | 2516 | |
5d4f98a2 YZ |
2517 | ret = 1; |
2518 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2519 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2520 | if (item_size < sizeof(*ei)) { | |
2521 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2522 | goto out; | |
2523 | } | |
2524 | #endif | |
2525 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2526 | |
5d4f98a2 YZ |
2527 | if (item_size != sizeof(*ei) + |
2528 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2529 | goto out; | |
be20aa9d | 2530 | |
5d4f98a2 YZ |
2531 | if (btrfs_extent_generation(leaf, ei) <= |
2532 | btrfs_root_last_snapshot(&root->root_item)) | |
2533 | goto out; | |
2534 | ||
2535 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2536 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2537 | BTRFS_EXTENT_DATA_REF_KEY) | |
2538 | goto out; | |
2539 | ||
2540 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2541 | if (btrfs_extent_refs(leaf, ei) != | |
2542 | btrfs_extent_data_ref_count(leaf, ref) || | |
2543 | btrfs_extent_data_ref_root(leaf, ref) != | |
2544 | root->root_key.objectid || | |
2545 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2546 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2547 | goto out; | |
2548 | ||
2549 | ret = 0; | |
2550 | out: | |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2555 | struct btrfs_root *root, | |
2556 | u64 objectid, u64 offset, u64 bytenr) | |
2557 | { | |
2558 | struct btrfs_path *path; | |
2559 | int ret; | |
2560 | int ret2; | |
2561 | ||
2562 | path = btrfs_alloc_path(); | |
2563 | if (!path) | |
2564 | return -ENOENT; | |
2565 | ||
2566 | do { | |
2567 | ret = check_committed_ref(trans, root, path, objectid, | |
2568 | offset, bytenr); | |
2569 | if (ret && ret != -ENOENT) | |
f321e491 | 2570 | goto out; |
80ff3856 | 2571 | |
5d4f98a2 YZ |
2572 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2573 | offset, bytenr); | |
2574 | } while (ret2 == -EAGAIN); | |
2575 | ||
2576 | if (ret2 && ret2 != -ENOENT) { | |
2577 | ret = ret2; | |
2578 | goto out; | |
f321e491 | 2579 | } |
5d4f98a2 YZ |
2580 | |
2581 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2582 | ret = 0; | |
be20aa9d | 2583 | out: |
80ff3856 | 2584 | btrfs_free_path(path); |
f0486c68 YZ |
2585 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2586 | WARN_ON(ret > 0); | |
f321e491 | 2587 | return ret; |
be20aa9d | 2588 | } |
c5739bba | 2589 | |
5d4f98a2 | 2590 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2591 | struct btrfs_root *root, |
5d4f98a2 YZ |
2592 | struct extent_buffer *buf, |
2593 | int full_backref, int inc) | |
31840ae1 ZY |
2594 | { |
2595 | u64 bytenr; | |
5d4f98a2 YZ |
2596 | u64 num_bytes; |
2597 | u64 parent; | |
31840ae1 | 2598 | u64 ref_root; |
31840ae1 | 2599 | u32 nritems; |
31840ae1 ZY |
2600 | struct btrfs_key key; |
2601 | struct btrfs_file_extent_item *fi; | |
2602 | int i; | |
2603 | int level; | |
2604 | int ret = 0; | |
31840ae1 | 2605 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2606 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2607 | |
2608 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2609 | nritems = btrfs_header_nritems(buf); |
2610 | level = btrfs_header_level(buf); | |
2611 | ||
5d4f98a2 YZ |
2612 | if (!root->ref_cows && level == 0) |
2613 | return 0; | |
31840ae1 | 2614 | |
5d4f98a2 YZ |
2615 | if (inc) |
2616 | process_func = btrfs_inc_extent_ref; | |
2617 | else | |
2618 | process_func = btrfs_free_extent; | |
31840ae1 | 2619 | |
5d4f98a2 YZ |
2620 | if (full_backref) |
2621 | parent = buf->start; | |
2622 | else | |
2623 | parent = 0; | |
2624 | ||
2625 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2626 | if (level == 0) { |
5d4f98a2 | 2627 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2628 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2629 | continue; | |
5d4f98a2 | 2630 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2631 | struct btrfs_file_extent_item); |
2632 | if (btrfs_file_extent_type(buf, fi) == | |
2633 | BTRFS_FILE_EXTENT_INLINE) | |
2634 | continue; | |
2635 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2636 | if (bytenr == 0) | |
2637 | continue; | |
5d4f98a2 YZ |
2638 | |
2639 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2640 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2641 | ret = process_func(trans, root, bytenr, num_bytes, | |
2642 | parent, ref_root, key.objectid, | |
2643 | key.offset); | |
31840ae1 ZY |
2644 | if (ret) |
2645 | goto fail; | |
2646 | } else { | |
5d4f98a2 YZ |
2647 | bytenr = btrfs_node_blockptr(buf, i); |
2648 | num_bytes = btrfs_level_size(root, level - 1); | |
2649 | ret = process_func(trans, root, bytenr, num_bytes, | |
2650 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2651 | if (ret) |
2652 | goto fail; | |
2653 | } | |
2654 | } | |
2655 | return 0; | |
2656 | fail: | |
5d4f98a2 YZ |
2657 | BUG(); |
2658 | return ret; | |
2659 | } | |
2660 | ||
2661 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2662 | struct extent_buffer *buf, int full_backref) | |
2663 | { | |
2664 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2665 | } | |
2666 | ||
2667 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2668 | struct extent_buffer *buf, int full_backref) | |
2669 | { | |
2670 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2671 | } |
2672 | ||
9078a3e1 CM |
2673 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2674 | struct btrfs_root *root, | |
2675 | struct btrfs_path *path, | |
2676 | struct btrfs_block_group_cache *cache) | |
2677 | { | |
2678 | int ret; | |
9078a3e1 | 2679 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2680 | unsigned long bi; |
2681 | struct extent_buffer *leaf; | |
9078a3e1 | 2682 | |
9078a3e1 | 2683 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2684 | if (ret < 0) |
2685 | goto fail; | |
9078a3e1 | 2686 | BUG_ON(ret); |
5f39d397 CM |
2687 | |
2688 | leaf = path->nodes[0]; | |
2689 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2690 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2691 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2692 | btrfs_release_path(path); |
54aa1f4d | 2693 | fail: |
9078a3e1 CM |
2694 | if (ret) |
2695 | return ret; | |
9078a3e1 CM |
2696 | return 0; |
2697 | ||
2698 | } | |
2699 | ||
4a8c9a62 YZ |
2700 | static struct btrfs_block_group_cache * |
2701 | next_block_group(struct btrfs_root *root, | |
2702 | struct btrfs_block_group_cache *cache) | |
2703 | { | |
2704 | struct rb_node *node; | |
2705 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2706 | node = rb_next(&cache->cache_node); | |
2707 | btrfs_put_block_group(cache); | |
2708 | if (node) { | |
2709 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2710 | cache_node); | |
11dfe35a | 2711 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2712 | } else |
2713 | cache = NULL; | |
2714 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2715 | return cache; | |
2716 | } | |
2717 | ||
0af3d00b JB |
2718 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2719 | struct btrfs_trans_handle *trans, | |
2720 | struct btrfs_path *path) | |
2721 | { | |
2722 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2723 | struct inode *inode = NULL; | |
2724 | u64 alloc_hint = 0; | |
2b20982e | 2725 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2726 | int num_pages = 0; |
2727 | int retries = 0; | |
2728 | int ret = 0; | |
2729 | ||
2730 | /* | |
2731 | * If this block group is smaller than 100 megs don't bother caching the | |
2732 | * block group. | |
2733 | */ | |
2734 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2735 | spin_lock(&block_group->lock); | |
2736 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2737 | spin_unlock(&block_group->lock); | |
2738 | return 0; | |
2739 | } | |
2740 | ||
2741 | again: | |
2742 | inode = lookup_free_space_inode(root, block_group, path); | |
2743 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2744 | ret = PTR_ERR(inode); | |
b3b4aa74 | 2745 | btrfs_release_path(path); |
0af3d00b JB |
2746 | goto out; |
2747 | } | |
2748 | ||
2749 | if (IS_ERR(inode)) { | |
2750 | BUG_ON(retries); | |
2751 | retries++; | |
2752 | ||
2753 | if (block_group->ro) | |
2754 | goto out_free; | |
2755 | ||
2756 | ret = create_free_space_inode(root, trans, block_group, path); | |
2757 | if (ret) | |
2758 | goto out_free; | |
2759 | goto again; | |
2760 | } | |
2761 | ||
5b0e95bf JB |
2762 | /* We've already setup this transaction, go ahead and exit */ |
2763 | if (block_group->cache_generation == trans->transid && | |
2764 | i_size_read(inode)) { | |
2765 | dcs = BTRFS_DC_SETUP; | |
2766 | goto out_put; | |
2767 | } | |
2768 | ||
0af3d00b JB |
2769 | /* |
2770 | * We want to set the generation to 0, that way if anything goes wrong | |
2771 | * from here on out we know not to trust this cache when we load up next | |
2772 | * time. | |
2773 | */ | |
2774 | BTRFS_I(inode)->generation = 0; | |
2775 | ret = btrfs_update_inode(trans, root, inode); | |
2776 | WARN_ON(ret); | |
2777 | ||
2778 | if (i_size_read(inode) > 0) { | |
2779 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2780 | inode); | |
2781 | if (ret) | |
2782 | goto out_put; | |
2783 | } | |
2784 | ||
2785 | spin_lock(&block_group->lock); | |
2786 | if (block_group->cached != BTRFS_CACHE_FINISHED) { | |
2b20982e JB |
2787 | /* We're not cached, don't bother trying to write stuff out */ |
2788 | dcs = BTRFS_DC_WRITTEN; | |
0af3d00b JB |
2789 | spin_unlock(&block_group->lock); |
2790 | goto out_put; | |
2791 | } | |
2792 | spin_unlock(&block_group->lock); | |
2793 | ||
2794 | num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024); | |
2795 | if (!num_pages) | |
2796 | num_pages = 1; | |
2797 | ||
2798 | /* | |
2799 | * Just to make absolutely sure we have enough space, we're going to | |
2800 | * preallocate 12 pages worth of space for each block group. In | |
2801 | * practice we ought to use at most 8, but we need extra space so we can | |
2802 | * add our header and have a terminator between the extents and the | |
2803 | * bitmaps. | |
2804 | */ | |
2805 | num_pages *= 16; | |
2806 | num_pages *= PAGE_CACHE_SIZE; | |
2807 | ||
2808 | ret = btrfs_check_data_free_space(inode, num_pages); | |
2809 | if (ret) | |
2810 | goto out_put; | |
2811 | ||
2812 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
2813 | num_pages, num_pages, | |
2814 | &alloc_hint); | |
2b20982e JB |
2815 | if (!ret) |
2816 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 2817 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 2818 | |
0af3d00b JB |
2819 | out_put: |
2820 | iput(inode); | |
2821 | out_free: | |
b3b4aa74 | 2822 | btrfs_release_path(path); |
0af3d00b JB |
2823 | out: |
2824 | spin_lock(&block_group->lock); | |
e65cbb94 | 2825 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 2826 | block_group->cache_generation = trans->transid; |
2b20982e | 2827 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
2828 | spin_unlock(&block_group->lock); |
2829 | ||
2830 | return ret; | |
2831 | } | |
2832 | ||
96b5179d CM |
2833 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2834 | struct btrfs_root *root) | |
9078a3e1 | 2835 | { |
4a8c9a62 | 2836 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2837 | int err = 0; |
9078a3e1 | 2838 | struct btrfs_path *path; |
96b5179d | 2839 | u64 last = 0; |
9078a3e1 CM |
2840 | |
2841 | path = btrfs_alloc_path(); | |
2842 | if (!path) | |
2843 | return -ENOMEM; | |
2844 | ||
0af3d00b JB |
2845 | again: |
2846 | while (1) { | |
2847 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2848 | while (cache) { | |
2849 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
2850 | break; | |
2851 | cache = next_block_group(root, cache); | |
2852 | } | |
2853 | if (!cache) { | |
2854 | if (last == 0) | |
2855 | break; | |
2856 | last = 0; | |
2857 | continue; | |
2858 | } | |
2859 | err = cache_save_setup(cache, trans, path); | |
2860 | last = cache->key.objectid + cache->key.offset; | |
2861 | btrfs_put_block_group(cache); | |
2862 | } | |
2863 | ||
d397712b | 2864 | while (1) { |
4a8c9a62 YZ |
2865 | if (last == 0) { |
2866 | err = btrfs_run_delayed_refs(trans, root, | |
2867 | (unsigned long)-1); | |
2868 | BUG_ON(err); | |
0f9dd46c | 2869 | } |
54aa1f4d | 2870 | |
4a8c9a62 YZ |
2871 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2872 | while (cache) { | |
0af3d00b JB |
2873 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
2874 | btrfs_put_block_group(cache); | |
2875 | goto again; | |
2876 | } | |
2877 | ||
4a8c9a62 YZ |
2878 | if (cache->dirty) |
2879 | break; | |
2880 | cache = next_block_group(root, cache); | |
2881 | } | |
2882 | if (!cache) { | |
2883 | if (last == 0) | |
2884 | break; | |
2885 | last = 0; | |
2886 | continue; | |
2887 | } | |
0f9dd46c | 2888 | |
0cb59c99 JB |
2889 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
2890 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 2891 | cache->dirty = 0; |
4a8c9a62 | 2892 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2893 | |
4a8c9a62 YZ |
2894 | err = write_one_cache_group(trans, root, path, cache); |
2895 | BUG_ON(err); | |
2896 | btrfs_put_block_group(cache); | |
9078a3e1 | 2897 | } |
4a8c9a62 | 2898 | |
0cb59c99 JB |
2899 | while (1) { |
2900 | /* | |
2901 | * I don't think this is needed since we're just marking our | |
2902 | * preallocated extent as written, but just in case it can't | |
2903 | * hurt. | |
2904 | */ | |
2905 | if (last == 0) { | |
2906 | err = btrfs_run_delayed_refs(trans, root, | |
2907 | (unsigned long)-1); | |
2908 | BUG_ON(err); | |
2909 | } | |
2910 | ||
2911 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2912 | while (cache) { | |
2913 | /* | |
2914 | * Really this shouldn't happen, but it could if we | |
2915 | * couldn't write the entire preallocated extent and | |
2916 | * splitting the extent resulted in a new block. | |
2917 | */ | |
2918 | if (cache->dirty) { | |
2919 | btrfs_put_block_group(cache); | |
2920 | goto again; | |
2921 | } | |
2922 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2923 | break; | |
2924 | cache = next_block_group(root, cache); | |
2925 | } | |
2926 | if (!cache) { | |
2927 | if (last == 0) | |
2928 | break; | |
2929 | last = 0; | |
2930 | continue; | |
2931 | } | |
2932 | ||
2933 | btrfs_write_out_cache(root, trans, cache, path); | |
2934 | ||
2935 | /* | |
2936 | * If we didn't have an error then the cache state is still | |
2937 | * NEED_WRITE, so we can set it to WRITTEN. | |
2938 | */ | |
2939 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2940 | cache->disk_cache_state = BTRFS_DC_WRITTEN; | |
2941 | last = cache->key.objectid + cache->key.offset; | |
2942 | btrfs_put_block_group(cache); | |
2943 | } | |
2944 | ||
9078a3e1 | 2945 | btrfs_free_path(path); |
4a8c9a62 | 2946 | return 0; |
9078a3e1 CM |
2947 | } |
2948 | ||
d2fb3437 YZ |
2949 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2950 | { | |
2951 | struct btrfs_block_group_cache *block_group; | |
2952 | int readonly = 0; | |
2953 | ||
2954 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2955 | if (!block_group || block_group->ro) | |
2956 | readonly = 1; | |
2957 | if (block_group) | |
fa9c0d79 | 2958 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2959 | return readonly; |
2960 | } | |
2961 | ||
593060d7 CM |
2962 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2963 | u64 total_bytes, u64 bytes_used, | |
2964 | struct btrfs_space_info **space_info) | |
2965 | { | |
2966 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2967 | int i; |
2968 | int factor; | |
2969 | ||
2970 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2971 | BTRFS_BLOCK_GROUP_RAID10)) | |
2972 | factor = 2; | |
2973 | else | |
2974 | factor = 1; | |
593060d7 CM |
2975 | |
2976 | found = __find_space_info(info, flags); | |
2977 | if (found) { | |
25179201 | 2978 | spin_lock(&found->lock); |
593060d7 | 2979 | found->total_bytes += total_bytes; |
89a55897 | 2980 | found->disk_total += total_bytes * factor; |
593060d7 | 2981 | found->bytes_used += bytes_used; |
b742bb82 | 2982 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2983 | found->full = 0; |
25179201 | 2984 | spin_unlock(&found->lock); |
593060d7 CM |
2985 | *space_info = found; |
2986 | return 0; | |
2987 | } | |
c146afad | 2988 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2989 | if (!found) |
2990 | return -ENOMEM; | |
2991 | ||
b742bb82 YZ |
2992 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
2993 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 2994 | init_rwsem(&found->groups_sem); |
0f9dd46c | 2995 | spin_lock_init(&found->lock); |
b742bb82 YZ |
2996 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
2997 | BTRFS_BLOCK_GROUP_SYSTEM | | |
2998 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 | 2999 | found->total_bytes = total_bytes; |
89a55897 | 3000 | found->disk_total = total_bytes * factor; |
593060d7 | 3001 | found->bytes_used = bytes_used; |
b742bb82 | 3002 | found->disk_used = bytes_used * factor; |
593060d7 | 3003 | found->bytes_pinned = 0; |
e8569813 | 3004 | found->bytes_reserved = 0; |
c146afad | 3005 | found->bytes_readonly = 0; |
f0486c68 | 3006 | found->bytes_may_use = 0; |
593060d7 | 3007 | found->full = 0; |
0e4f8f88 | 3008 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3009 | found->chunk_alloc = 0; |
fdb5effd JB |
3010 | found->flush = 0; |
3011 | init_waitqueue_head(&found->wait); | |
593060d7 | 3012 | *space_info = found; |
4184ea7f | 3013 | list_add_rcu(&found->list, &info->space_info); |
593060d7 CM |
3014 | return 0; |
3015 | } | |
3016 | ||
8790d502 CM |
3017 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3018 | { | |
3019 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 3020 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 3021 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 3022 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
3023 | if (extra_flags) { |
3024 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3025 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3026 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3027 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3028 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3029 | fs_info->avail_system_alloc_bits |= extra_flags; | |
3030 | } | |
3031 | } | |
593060d7 | 3032 | |
2b82032c | 3033 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3034 | { |
cd02dca5 CM |
3035 | /* |
3036 | * we add in the count of missing devices because we want | |
3037 | * to make sure that any RAID levels on a degraded FS | |
3038 | * continue to be honored. | |
3039 | */ | |
3040 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3041 | root->fs_info->fs_devices->missing_devices; | |
a061fc8d CM |
3042 | |
3043 | if (num_devices == 1) | |
3044 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
3045 | if (num_devices < 4) | |
3046 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3047 | ||
ec44a35c CM |
3048 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
3049 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 3050 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 3051 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 3052 | } |
ec44a35c CM |
3053 | |
3054 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 3055 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 3056 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 3057 | } |
ec44a35c CM |
3058 | |
3059 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
3060 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
3061 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
3062 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
3063 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
3064 | return flags; | |
3065 | } | |
3066 | ||
b742bb82 | 3067 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3068 | { |
b742bb82 YZ |
3069 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3070 | flags |= root->fs_info->avail_data_alloc_bits & | |
3071 | root->fs_info->data_alloc_profile; | |
3072 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3073 | flags |= root->fs_info->avail_system_alloc_bits & | |
3074 | root->fs_info->system_alloc_profile; | |
3075 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3076 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
3077 | root->fs_info->metadata_alloc_profile; | |
3078 | return btrfs_reduce_alloc_profile(root, flags); | |
6a63209f JB |
3079 | } |
3080 | ||
6d07bcec | 3081 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3082 | { |
b742bb82 | 3083 | u64 flags; |
9ed74f2d | 3084 | |
b742bb82 YZ |
3085 | if (data) |
3086 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3087 | else if (root == root->fs_info->chunk_root) | |
3088 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3089 | else |
b742bb82 | 3090 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3091 | |
b742bb82 | 3092 | return get_alloc_profile(root, flags); |
6a63209f | 3093 | } |
9ed74f2d | 3094 | |
6a63209f JB |
3095 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
3096 | { | |
6a63209f | 3097 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 3098 | BTRFS_BLOCK_GROUP_DATA); |
9ed74f2d JB |
3099 | } |
3100 | ||
6a63209f | 3101 | /* |
6a63209f JB |
3102 | * This will check the space that the inode allocates from to make sure we have |
3103 | * enough space for bytes. | |
6a63209f | 3104 | */ |
0ca1f7ce | 3105 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3106 | { |
6a63209f | 3107 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3108 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 3109 | u64 used; |
0af3d00b | 3110 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3111 | |
6a63209f JB |
3112 | /* make sure bytes are sectorsize aligned */ |
3113 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3114 | |
82d5902d LZ |
3115 | if (root == root->fs_info->tree_root || |
3116 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3117 | alloc_chunk = 0; |
3118 | committed = 1; | |
3119 | } | |
3120 | ||
6a63209f | 3121 | data_sinfo = BTRFS_I(inode)->space_info; |
33b4d47f CM |
3122 | if (!data_sinfo) |
3123 | goto alloc; | |
9ed74f2d | 3124 | |
6a63209f JB |
3125 | again: |
3126 | /* make sure we have enough space to handle the data first */ | |
3127 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3128 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3129 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3130 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3131 | |
3132 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3133 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3134 | |
6a63209f JB |
3135 | /* |
3136 | * if we don't have enough free bytes in this space then we need | |
3137 | * to alloc a new chunk. | |
3138 | */ | |
0af3d00b | 3139 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3140 | u64 alloc_target; |
9ed74f2d | 3141 | |
0e4f8f88 | 3142 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3143 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3144 | alloc: |
6a63209f | 3145 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3146 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3147 | if (IS_ERR(trans)) |
3148 | return PTR_ERR(trans); | |
9ed74f2d | 3149 | |
6a63209f JB |
3150 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
3151 | bytes + 2 * 1024 * 1024, | |
0e4f8f88 CM |
3152 | alloc_target, |
3153 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3154 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3155 | if (ret < 0) { |
3156 | if (ret != -ENOSPC) | |
3157 | return ret; | |
3158 | else | |
3159 | goto commit_trans; | |
3160 | } | |
9ed74f2d | 3161 | |
33b4d47f CM |
3162 | if (!data_sinfo) { |
3163 | btrfs_set_inode_space_info(root, inode); | |
3164 | data_sinfo = BTRFS_I(inode)->space_info; | |
3165 | } | |
6a63209f JB |
3166 | goto again; |
3167 | } | |
f2bb8f5c JB |
3168 | |
3169 | /* | |
3170 | * If we have less pinned bytes than we want to allocate then | |
3171 | * don't bother committing the transaction, it won't help us. | |
3172 | */ | |
3173 | if (data_sinfo->bytes_pinned < bytes) | |
3174 | committed = 1; | |
6a63209f | 3175 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3176 | |
4e06bdd6 | 3177 | /* commit the current transaction and try again */ |
d52a5b5f | 3178 | commit_trans: |
a4abeea4 JB |
3179 | if (!committed && |
3180 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3181 | committed = 1; |
7a7eaa40 | 3182 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3183 | if (IS_ERR(trans)) |
3184 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3185 | ret = btrfs_commit_transaction(trans, root); |
3186 | if (ret) | |
3187 | return ret; | |
3188 | goto again; | |
3189 | } | |
9ed74f2d | 3190 | |
6a63209f JB |
3191 | return -ENOSPC; |
3192 | } | |
3193 | data_sinfo->bytes_may_use += bytes; | |
6a63209f | 3194 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3195 | |
9ed74f2d | 3196 | return 0; |
9ed74f2d | 3197 | } |
6a63209f | 3198 | |
6a63209f | 3199 | /* |
fb25e914 | 3200 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3201 | */ |
0ca1f7ce | 3202 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3203 | { |
0ca1f7ce | 3204 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3205 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3206 | |
6a63209f JB |
3207 | /* make sure bytes are sectorsize aligned */ |
3208 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3209 | |
6a63209f JB |
3210 | data_sinfo = BTRFS_I(inode)->space_info; |
3211 | spin_lock(&data_sinfo->lock); | |
3212 | data_sinfo->bytes_may_use -= bytes; | |
6a63209f | 3213 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3214 | } |
3215 | ||
97e728d4 | 3216 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3217 | { |
97e728d4 JB |
3218 | struct list_head *head = &info->space_info; |
3219 | struct btrfs_space_info *found; | |
e3ccfa98 | 3220 | |
97e728d4 JB |
3221 | rcu_read_lock(); |
3222 | list_for_each_entry_rcu(found, head, list) { | |
3223 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3224 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3225 | } |
97e728d4 | 3226 | rcu_read_unlock(); |
e3ccfa98 JB |
3227 | } |
3228 | ||
e5bc2458 | 3229 | static int should_alloc_chunk(struct btrfs_root *root, |
0e4f8f88 CM |
3230 | struct btrfs_space_info *sinfo, u64 alloc_bytes, |
3231 | int force) | |
32c00aff | 3232 | { |
fb25e914 | 3233 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3234 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3235 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3236 | u64 thresh; |
e3ccfa98 | 3237 | |
0e4f8f88 CM |
3238 | if (force == CHUNK_ALLOC_FORCE) |
3239 | return 1; | |
3240 | ||
fb25e914 JB |
3241 | /* |
3242 | * We need to take into account the global rsv because for all intents | |
3243 | * and purposes it's used space. Don't worry about locking the | |
3244 | * global_rsv, it doesn't change except when the transaction commits. | |
3245 | */ | |
3246 | num_allocated += global_rsv->size; | |
3247 | ||
0e4f8f88 CM |
3248 | /* |
3249 | * in limited mode, we want to have some free space up to | |
3250 | * about 1% of the FS size. | |
3251 | */ | |
3252 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3253 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3254 | thresh = max_t(u64, 64 * 1024 * 1024, |
3255 | div_factor_fine(thresh, 1)); | |
3256 | ||
3257 | if (num_bytes - num_allocated < thresh) | |
3258 | return 1; | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * we have two similar checks here, one based on percentage | |
3263 | * and once based on a hard number of 256MB. The idea | |
3264 | * is that if we have a good amount of free | |
3265 | * room, don't allocate a chunk. A good mount is | |
3266 | * less than 80% utilized of the chunks we have allocated, | |
3267 | * or more than 256MB free | |
3268 | */ | |
3269 | if (num_allocated + alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
424499db | 3270 | return 0; |
e3ccfa98 | 3271 | |
0e4f8f88 | 3272 | if (num_allocated + alloc_bytes < div_factor(num_bytes, 8)) |
424499db | 3273 | return 0; |
32c00aff | 3274 | |
6c41761f | 3275 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3276 | |
3277 | /* 256MB or 5% of the FS */ | |
e5bc2458 CM |
3278 | thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5)); |
3279 | ||
3280 | if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3)) | |
14ed0ca6 | 3281 | return 0; |
424499db | 3282 | return 1; |
32c00aff JB |
3283 | } |
3284 | ||
6324fbf3 CM |
3285 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3286 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3287 | u64 flags, int force) |
9ed74f2d | 3288 | { |
6324fbf3 | 3289 | struct btrfs_space_info *space_info; |
97e728d4 | 3290 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3291 | int wait_for_alloc = 0; |
9ed74f2d | 3292 | int ret = 0; |
9ed74f2d | 3293 | |
2b82032c | 3294 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3295 | |
6324fbf3 | 3296 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3297 | if (!space_info) { |
3298 | ret = update_space_info(extent_root->fs_info, flags, | |
3299 | 0, 0, &space_info); | |
3300 | BUG_ON(ret); | |
9ed74f2d | 3301 | } |
6324fbf3 | 3302 | BUG_ON(!space_info); |
9ed74f2d | 3303 | |
6d74119f | 3304 | again: |
25179201 | 3305 | spin_lock(&space_info->lock); |
9ed74f2d | 3306 | if (space_info->force_alloc) |
0e4f8f88 | 3307 | force = space_info->force_alloc; |
25179201 JB |
3308 | if (space_info->full) { |
3309 | spin_unlock(&space_info->lock); | |
6d74119f | 3310 | return 0; |
9ed74f2d JB |
3311 | } |
3312 | ||
0e4f8f88 | 3313 | if (!should_alloc_chunk(extent_root, space_info, alloc_bytes, force)) { |
25179201 | 3314 | spin_unlock(&space_info->lock); |
6d74119f JB |
3315 | return 0; |
3316 | } else if (space_info->chunk_alloc) { | |
3317 | wait_for_alloc = 1; | |
3318 | } else { | |
3319 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3320 | } |
0e4f8f88 | 3321 | |
25179201 | 3322 | spin_unlock(&space_info->lock); |
9ed74f2d | 3323 | |
6d74119f JB |
3324 | mutex_lock(&fs_info->chunk_mutex); |
3325 | ||
3326 | /* | |
3327 | * The chunk_mutex is held throughout the entirety of a chunk | |
3328 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3329 | * other guy is done and we need to recheck and see if we should | |
3330 | * allocate. | |
3331 | */ | |
3332 | if (wait_for_alloc) { | |
3333 | mutex_unlock(&fs_info->chunk_mutex); | |
3334 | wait_for_alloc = 0; | |
3335 | goto again; | |
3336 | } | |
3337 | ||
67377734 JB |
3338 | /* |
3339 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3340 | * allocating mixed chunks instead of individual chunks. | |
3341 | */ | |
3342 | if (btrfs_mixed_space_info(space_info)) | |
3343 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3344 | ||
97e728d4 JB |
3345 | /* |
3346 | * if we're doing a data chunk, go ahead and make sure that | |
3347 | * we keep a reasonable number of metadata chunks allocated in the | |
3348 | * FS as well. | |
3349 | */ | |
9ed74f2d | 3350 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3351 | fs_info->data_chunk_allocations++; |
3352 | if (!(fs_info->data_chunk_allocations % | |
3353 | fs_info->metadata_ratio)) | |
3354 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3355 | } |
3356 | ||
2b82032c | 3357 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
92b8e897 MF |
3358 | if (ret < 0 && ret != -ENOSPC) |
3359 | goto out; | |
3360 | ||
9ed74f2d | 3361 | spin_lock(&space_info->lock); |
9ed74f2d | 3362 | if (ret) |
6324fbf3 | 3363 | space_info->full = 1; |
424499db YZ |
3364 | else |
3365 | ret = 1; | |
6d74119f | 3366 | |
0e4f8f88 | 3367 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3368 | space_info->chunk_alloc = 0; |
9ed74f2d | 3369 | spin_unlock(&space_info->lock); |
92b8e897 | 3370 | out: |
c146afad | 3371 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3372 | return ret; |
6324fbf3 | 3373 | } |
9ed74f2d | 3374 | |
9ed74f2d | 3375 | /* |
5da9d01b | 3376 | * shrink metadata reservation for delalloc |
9ed74f2d | 3377 | */ |
663350ac | 3378 | static int shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, |
f104d044 | 3379 | bool wait_ordered) |
5da9d01b | 3380 | { |
0ca1f7ce | 3381 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3382 | struct btrfs_space_info *space_info; |
663350ac | 3383 | struct btrfs_trans_handle *trans; |
5da9d01b YZ |
3384 | u64 reserved; |
3385 | u64 max_reclaim; | |
3386 | u64 reclaimed = 0; | |
b1953bce | 3387 | long time_left; |
877da174 | 3388 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3389 | int loops = 0; |
36e39c40 | 3390 | unsigned long progress; |
5da9d01b | 3391 | |
663350ac | 3392 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 3393 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3394 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3395 | |
3396 | smp_mb(); | |
fb25e914 | 3397 | reserved = space_info->bytes_may_use; |
36e39c40 | 3398 | progress = space_info->reservation_progress; |
5da9d01b YZ |
3399 | |
3400 | if (reserved == 0) | |
3401 | return 0; | |
c4f675cd | 3402 | |
fdb5effd JB |
3403 | smp_mb(); |
3404 | if (root->fs_info->delalloc_bytes == 0) { | |
3405 | if (trans) | |
3406 | return 0; | |
3407 | btrfs_wait_ordered_extents(root, 0, 0); | |
3408 | return 0; | |
3409 | } | |
3410 | ||
5da9d01b | 3411 | max_reclaim = min(reserved, to_reclaim); |
877da174 JB |
3412 | nr_pages = max_t(unsigned long, nr_pages, |
3413 | max_reclaim >> PAGE_CACHE_SHIFT); | |
b1953bce | 3414 | while (loops < 1024) { |
bf9022e0 CM |
3415 | /* have the flusher threads jump in and do some IO */ |
3416 | smp_mb(); | |
3417 | nr_pages = min_t(unsigned long, nr_pages, | |
3418 | root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT); | |
0e175a18 CW |
3419 | writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages, |
3420 | WB_REASON_FS_FREE_SPACE); | |
5da9d01b | 3421 | |
0019f10d | 3422 | spin_lock(&space_info->lock); |
fb25e914 JB |
3423 | if (reserved > space_info->bytes_may_use) |
3424 | reclaimed += reserved - space_info->bytes_may_use; | |
3425 | reserved = space_info->bytes_may_use; | |
0019f10d | 3426 | spin_unlock(&space_info->lock); |
5da9d01b | 3427 | |
36e39c40 CM |
3428 | loops++; |
3429 | ||
5da9d01b YZ |
3430 | if (reserved == 0 || reclaimed >= max_reclaim) |
3431 | break; | |
3432 | ||
3433 | if (trans && trans->transaction->blocked) | |
3434 | return -EAGAIN; | |
bf9022e0 | 3435 | |
f104d044 JB |
3436 | if (wait_ordered && !trans) { |
3437 | btrfs_wait_ordered_extents(root, 0, 0); | |
3438 | } else { | |
3439 | time_left = schedule_timeout_interruptible(1); | |
b1953bce | 3440 | |
f104d044 JB |
3441 | /* We were interrupted, exit */ |
3442 | if (time_left) | |
3443 | break; | |
3444 | } | |
b1953bce | 3445 | |
36e39c40 CM |
3446 | /* we've kicked the IO a few times, if anything has been freed, |
3447 | * exit. There is no sense in looping here for a long time | |
3448 | * when we really need to commit the transaction, or there are | |
3449 | * just too many writers without enough free space | |
3450 | */ | |
3451 | ||
3452 | if (loops > 3) { | |
3453 | smp_mb(); | |
3454 | if (progress != space_info->reservation_progress) | |
3455 | break; | |
3456 | } | |
bf9022e0 | 3457 | |
5da9d01b | 3458 | } |
f104d044 | 3459 | |
5da9d01b YZ |
3460 | return reclaimed >= to_reclaim; |
3461 | } | |
3462 | ||
663350ac JB |
3463 | /** |
3464 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
3465 | * @root - the root we're allocating for | |
3466 | * @bytes - the number of bytes we want to reserve | |
3467 | * @force - force the commit | |
8bb8ab2e | 3468 | * |
663350ac JB |
3469 | * This will check to make sure that committing the transaction will actually |
3470 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
3471 | * will return -ENOSPC. | |
8bb8ab2e | 3472 | */ |
663350ac JB |
3473 | static int may_commit_transaction(struct btrfs_root *root, |
3474 | struct btrfs_space_info *space_info, | |
3475 | u64 bytes, int force) | |
3476 | { | |
3477 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
3478 | struct btrfs_trans_handle *trans; | |
3479 | ||
3480 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
3481 | if (trans) | |
3482 | return -EAGAIN; | |
3483 | ||
3484 | if (force) | |
3485 | goto commit; | |
3486 | ||
3487 | /* See if there is enough pinned space to make this reservation */ | |
3488 | spin_lock(&space_info->lock); | |
3489 | if (space_info->bytes_pinned >= bytes) { | |
3490 | spin_unlock(&space_info->lock); | |
3491 | goto commit; | |
3492 | } | |
3493 | spin_unlock(&space_info->lock); | |
3494 | ||
3495 | /* | |
3496 | * See if there is some space in the delayed insertion reservation for | |
3497 | * this reservation. | |
3498 | */ | |
3499 | if (space_info != delayed_rsv->space_info) | |
3500 | return -ENOSPC; | |
3501 | ||
3502 | spin_lock(&delayed_rsv->lock); | |
3503 | if (delayed_rsv->size < bytes) { | |
3504 | spin_unlock(&delayed_rsv->lock); | |
3505 | return -ENOSPC; | |
3506 | } | |
3507 | spin_unlock(&delayed_rsv->lock); | |
3508 | ||
3509 | commit: | |
3510 | trans = btrfs_join_transaction(root); | |
3511 | if (IS_ERR(trans)) | |
3512 | return -ENOSPC; | |
3513 | ||
3514 | return btrfs_commit_transaction(trans, root); | |
3515 | } | |
3516 | ||
4a92b1b8 JB |
3517 | /** |
3518 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
3519 | * @root - the root we're allocating for | |
3520 | * @block_rsv - the block_rsv we're allocating for | |
3521 | * @orig_bytes - the number of bytes we want | |
3522 | * @flush - wether or not we can flush to make our reservation | |
8bb8ab2e | 3523 | * |
4a92b1b8 JB |
3524 | * This will reserve orgi_bytes number of bytes from the space info associated |
3525 | * with the block_rsv. If there is not enough space it will make an attempt to | |
3526 | * flush out space to make room. It will do this by flushing delalloc if | |
3527 | * possible or committing the transaction. If flush is 0 then no attempts to | |
3528 | * regain reservations will be made and this will fail if there is not enough | |
3529 | * space already. | |
8bb8ab2e | 3530 | */ |
4a92b1b8 | 3531 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e JB |
3532 | struct btrfs_block_rsv *block_rsv, |
3533 | u64 orig_bytes, int flush) | |
9ed74f2d | 3534 | { |
f0486c68 | 3535 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 3536 | u64 used; |
8bb8ab2e JB |
3537 | u64 num_bytes = orig_bytes; |
3538 | int retries = 0; | |
3539 | int ret = 0; | |
38227933 | 3540 | bool committed = false; |
fdb5effd | 3541 | bool flushing = false; |
f104d044 | 3542 | bool wait_ordered = false; |
9ed74f2d | 3543 | |
8bb8ab2e | 3544 | again: |
fdb5effd | 3545 | ret = 0; |
8bb8ab2e | 3546 | spin_lock(&space_info->lock); |
fdb5effd JB |
3547 | /* |
3548 | * We only want to wait if somebody other than us is flushing and we are | |
3549 | * actually alloed to flush. | |
3550 | */ | |
3551 | while (flush && !flushing && space_info->flush) { | |
3552 | spin_unlock(&space_info->lock); | |
3553 | /* | |
3554 | * If we have a trans handle we can't wait because the flusher | |
3555 | * may have to commit the transaction, which would mean we would | |
3556 | * deadlock since we are waiting for the flusher to finish, but | |
3557 | * hold the current transaction open. | |
3558 | */ | |
663350ac | 3559 | if (current->journal_info) |
fdb5effd JB |
3560 | return -EAGAIN; |
3561 | ret = wait_event_interruptible(space_info->wait, | |
3562 | !space_info->flush); | |
3563 | /* Must have been interrupted, return */ | |
3564 | if (ret) | |
3565 | return -EINTR; | |
3566 | ||
3567 | spin_lock(&space_info->lock); | |
3568 | } | |
3569 | ||
3570 | ret = -ENOSPC; | |
2bf64758 JB |
3571 | used = space_info->bytes_used + space_info->bytes_reserved + |
3572 | space_info->bytes_pinned + space_info->bytes_readonly + | |
3573 | space_info->bytes_may_use; | |
9ed74f2d | 3574 | |
8bb8ab2e JB |
3575 | /* |
3576 | * The idea here is that we've not already over-reserved the block group | |
3577 | * then we can go ahead and save our reservation first and then start | |
3578 | * flushing if we need to. Otherwise if we've already overcommitted | |
3579 | * lets start flushing stuff first and then come back and try to make | |
3580 | * our reservation. | |
3581 | */ | |
2bf64758 JB |
3582 | if (used <= space_info->total_bytes) { |
3583 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 3584 | space_info->bytes_may_use += orig_bytes; |
8bb8ab2e JB |
3585 | ret = 0; |
3586 | } else { | |
3587 | /* | |
3588 | * Ok set num_bytes to orig_bytes since we aren't | |
3589 | * overocmmitted, this way we only try and reclaim what | |
3590 | * we need. | |
3591 | */ | |
3592 | num_bytes = orig_bytes; | |
3593 | } | |
3594 | } else { | |
3595 | /* | |
3596 | * Ok we're over committed, set num_bytes to the overcommitted | |
3597 | * amount plus the amount of bytes that we need for this | |
3598 | * reservation. | |
3599 | */ | |
f104d044 | 3600 | wait_ordered = true; |
2bf64758 | 3601 | num_bytes = used - space_info->total_bytes + |
8bb8ab2e JB |
3602 | (orig_bytes * (retries + 1)); |
3603 | } | |
9ed74f2d | 3604 | |
36ba022a | 3605 | if (ret) { |
2bf64758 JB |
3606 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3607 | u64 avail; | |
3608 | ||
7e355b83 JB |
3609 | /* |
3610 | * If we have a lot of space that's pinned, don't bother doing | |
3611 | * the overcommit dance yet and just commit the transaction. | |
3612 | */ | |
3613 | avail = (space_info->total_bytes - space_info->bytes_used) * 8; | |
3614 | do_div(avail, 10); | |
663350ac | 3615 | if (space_info->bytes_pinned >= avail && flush && !committed) { |
7e355b83 JB |
3616 | space_info->flush = 1; |
3617 | flushing = true; | |
3618 | spin_unlock(&space_info->lock); | |
663350ac JB |
3619 | ret = may_commit_transaction(root, space_info, |
3620 | orig_bytes, 1); | |
3621 | if (ret) | |
3622 | goto out; | |
3623 | committed = true; | |
3624 | goto again; | |
7e355b83 JB |
3625 | } |
3626 | ||
2bf64758 JB |
3627 | spin_lock(&root->fs_info->free_chunk_lock); |
3628 | avail = root->fs_info->free_chunk_space; | |
3629 | ||
3630 | /* | |
3631 | * If we have dup, raid1 or raid10 then only half of the free | |
3632 | * space is actually useable. | |
3633 | */ | |
3634 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3635 | BTRFS_BLOCK_GROUP_RAID1 | | |
3636 | BTRFS_BLOCK_GROUP_RAID10)) | |
3637 | avail >>= 1; | |
3638 | ||
3639 | /* | |
3640 | * If we aren't flushing don't let us overcommit too much, say | |
3641 | * 1/8th of the space. If we can flush, let it overcommit up to | |
3642 | * 1/2 of the space. | |
3643 | */ | |
3644 | if (flush) | |
3645 | avail >>= 3; | |
3646 | else | |
3647 | avail >>= 1; | |
3648 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3649 | ||
9a82ca65 | 3650 | if (used + num_bytes < space_info->total_bytes + avail) { |
2bf64758 JB |
3651 | space_info->bytes_may_use += orig_bytes; |
3652 | ret = 0; | |
f104d044 JB |
3653 | } else { |
3654 | wait_ordered = true; | |
2bf64758 JB |
3655 | } |
3656 | } | |
3657 | ||
8bb8ab2e JB |
3658 | /* |
3659 | * Couldn't make our reservation, save our place so while we're trying | |
3660 | * to reclaim space we can actually use it instead of somebody else | |
3661 | * stealing it from us. | |
3662 | */ | |
fdb5effd JB |
3663 | if (ret && flush) { |
3664 | flushing = true; | |
3665 | space_info->flush = 1; | |
8bb8ab2e | 3666 | } |
9ed74f2d | 3667 | |
f0486c68 | 3668 | spin_unlock(&space_info->lock); |
9ed74f2d | 3669 | |
fdb5effd | 3670 | if (!ret || !flush) |
8bb8ab2e | 3671 | goto out; |
f0486c68 | 3672 | |
8bb8ab2e JB |
3673 | /* |
3674 | * We do synchronous shrinking since we don't actually unreserve | |
3675 | * metadata until after the IO is completed. | |
3676 | */ | |
663350ac | 3677 | ret = shrink_delalloc(root, num_bytes, wait_ordered); |
fdb5effd | 3678 | if (ret < 0) |
8bb8ab2e | 3679 | goto out; |
f0486c68 | 3680 | |
75c195a2 CM |
3681 | ret = 0; |
3682 | ||
8bb8ab2e JB |
3683 | /* |
3684 | * So if we were overcommitted it's possible that somebody else flushed | |
3685 | * out enough space and we simply didn't have enough space to reclaim, | |
3686 | * so go back around and try again. | |
3687 | */ | |
3688 | if (retries < 2) { | |
f104d044 | 3689 | wait_ordered = true; |
8bb8ab2e JB |
3690 | retries++; |
3691 | goto again; | |
3692 | } | |
f0486c68 | 3693 | |
8bb8ab2e | 3694 | ret = -ENOSPC; |
75c195a2 CM |
3695 | if (committed) |
3696 | goto out; | |
3697 | ||
663350ac | 3698 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); |
38227933 | 3699 | if (!ret) { |
38227933 | 3700 | committed = true; |
8bb8ab2e | 3701 | goto again; |
38227933 | 3702 | } |
8bb8ab2e JB |
3703 | |
3704 | out: | |
fdb5effd | 3705 | if (flushing) { |
8bb8ab2e | 3706 | spin_lock(&space_info->lock); |
fdb5effd JB |
3707 | space_info->flush = 0; |
3708 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 3709 | spin_unlock(&space_info->lock); |
f0486c68 | 3710 | } |
f0486c68 YZ |
3711 | return ret; |
3712 | } | |
3713 | ||
3714 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3715 | struct btrfs_root *root) | |
3716 | { | |
4c13d758 JB |
3717 | struct btrfs_block_rsv *block_rsv = NULL; |
3718 | ||
3719 | if (root->ref_cows || root == root->fs_info->csum_root) | |
f0486c68 | 3720 | block_rsv = trans->block_rsv; |
4c13d758 JB |
3721 | |
3722 | if (!block_rsv) | |
f0486c68 YZ |
3723 | block_rsv = root->block_rsv; |
3724 | ||
3725 | if (!block_rsv) | |
3726 | block_rsv = &root->fs_info->empty_block_rsv; | |
3727 | ||
3728 | return block_rsv; | |
3729 | } | |
3730 | ||
3731 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3732 | u64 num_bytes) | |
3733 | { | |
3734 | int ret = -ENOSPC; | |
3735 | spin_lock(&block_rsv->lock); | |
3736 | if (block_rsv->reserved >= num_bytes) { | |
3737 | block_rsv->reserved -= num_bytes; | |
3738 | if (block_rsv->reserved < block_rsv->size) | |
3739 | block_rsv->full = 0; | |
3740 | ret = 0; | |
3741 | } | |
3742 | spin_unlock(&block_rsv->lock); | |
3743 | return ret; | |
3744 | } | |
3745 | ||
3746 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3747 | u64 num_bytes, int update_size) | |
3748 | { | |
3749 | spin_lock(&block_rsv->lock); | |
3750 | block_rsv->reserved += num_bytes; | |
3751 | if (update_size) | |
3752 | block_rsv->size += num_bytes; | |
3753 | else if (block_rsv->reserved >= block_rsv->size) | |
3754 | block_rsv->full = 1; | |
3755 | spin_unlock(&block_rsv->lock); | |
3756 | } | |
3757 | ||
62a45b60 DS |
3758 | static void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, |
3759 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
f0486c68 YZ |
3760 | { |
3761 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3762 | ||
3763 | spin_lock(&block_rsv->lock); | |
3764 | if (num_bytes == (u64)-1) | |
3765 | num_bytes = block_rsv->size; | |
3766 | block_rsv->size -= num_bytes; | |
3767 | if (block_rsv->reserved >= block_rsv->size) { | |
3768 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3769 | block_rsv->reserved = block_rsv->size; | |
3770 | block_rsv->full = 1; | |
3771 | } else { | |
3772 | num_bytes = 0; | |
3773 | } | |
3774 | spin_unlock(&block_rsv->lock); | |
3775 | ||
3776 | if (num_bytes > 0) { | |
3777 | if (dest) { | |
e9e22899 JB |
3778 | spin_lock(&dest->lock); |
3779 | if (!dest->full) { | |
3780 | u64 bytes_to_add; | |
3781 | ||
3782 | bytes_to_add = dest->size - dest->reserved; | |
3783 | bytes_to_add = min(num_bytes, bytes_to_add); | |
3784 | dest->reserved += bytes_to_add; | |
3785 | if (dest->reserved >= dest->size) | |
3786 | dest->full = 1; | |
3787 | num_bytes -= bytes_to_add; | |
3788 | } | |
3789 | spin_unlock(&dest->lock); | |
3790 | } | |
3791 | if (num_bytes) { | |
f0486c68 | 3792 | spin_lock(&space_info->lock); |
fb25e914 | 3793 | space_info->bytes_may_use -= num_bytes; |
36e39c40 | 3794 | space_info->reservation_progress++; |
f0486c68 | 3795 | spin_unlock(&space_info->lock); |
4e06bdd6 | 3796 | } |
9ed74f2d | 3797 | } |
f0486c68 | 3798 | } |
4e06bdd6 | 3799 | |
f0486c68 YZ |
3800 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
3801 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3802 | { | |
3803 | int ret; | |
9ed74f2d | 3804 | |
f0486c68 YZ |
3805 | ret = block_rsv_use_bytes(src, num_bytes); |
3806 | if (ret) | |
3807 | return ret; | |
9ed74f2d | 3808 | |
f0486c68 | 3809 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
3810 | return 0; |
3811 | } | |
3812 | ||
f0486c68 | 3813 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) |
9ed74f2d | 3814 | { |
f0486c68 YZ |
3815 | memset(rsv, 0, sizeof(*rsv)); |
3816 | spin_lock_init(&rsv->lock); | |
f0486c68 YZ |
3817 | } |
3818 | ||
3819 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3820 | { | |
3821 | struct btrfs_block_rsv *block_rsv; | |
3822 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 3823 | |
f0486c68 YZ |
3824 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
3825 | if (!block_rsv) | |
3826 | return NULL; | |
9ed74f2d | 3827 | |
f0486c68 | 3828 | btrfs_init_block_rsv(block_rsv); |
f0486c68 YZ |
3829 | block_rsv->space_info = __find_space_info(fs_info, |
3830 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
3831 | return block_rsv; |
3832 | } | |
9ed74f2d | 3833 | |
f0486c68 YZ |
3834 | void btrfs_free_block_rsv(struct btrfs_root *root, |
3835 | struct btrfs_block_rsv *rsv) | |
3836 | { | |
dabdb640 JB |
3837 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
3838 | kfree(rsv); | |
9ed74f2d JB |
3839 | } |
3840 | ||
61b520a9 MX |
3841 | static inline int __block_rsv_add(struct btrfs_root *root, |
3842 | struct btrfs_block_rsv *block_rsv, | |
3843 | u64 num_bytes, int flush) | |
9ed74f2d | 3844 | { |
f0486c68 | 3845 | int ret; |
9ed74f2d | 3846 | |
f0486c68 YZ |
3847 | if (num_bytes == 0) |
3848 | return 0; | |
8bb8ab2e | 3849 | |
61b520a9 | 3850 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
3851 | if (!ret) { |
3852 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3853 | return 0; | |
3854 | } | |
9ed74f2d | 3855 | |
f0486c68 | 3856 | return ret; |
f0486c68 | 3857 | } |
9ed74f2d | 3858 | |
61b520a9 MX |
3859 | int btrfs_block_rsv_add(struct btrfs_root *root, |
3860 | struct btrfs_block_rsv *block_rsv, | |
3861 | u64 num_bytes) | |
3862 | { | |
3863 | return __block_rsv_add(root, block_rsv, num_bytes, 1); | |
3864 | } | |
3865 | ||
c06a0e12 JB |
3866 | int btrfs_block_rsv_add_noflush(struct btrfs_root *root, |
3867 | struct btrfs_block_rsv *block_rsv, | |
3868 | u64 num_bytes) | |
f0486c68 | 3869 | { |
61b520a9 | 3870 | return __block_rsv_add(root, block_rsv, num_bytes, 0); |
f0486c68 | 3871 | } |
9ed74f2d | 3872 | |
4a92b1b8 | 3873 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 3874 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
3875 | { |
3876 | u64 num_bytes = 0; | |
f0486c68 | 3877 | int ret = -ENOSPC; |
9ed74f2d | 3878 | |
f0486c68 YZ |
3879 | if (!block_rsv) |
3880 | return 0; | |
9ed74f2d | 3881 | |
f0486c68 | 3882 | spin_lock(&block_rsv->lock); |
36ba022a JB |
3883 | num_bytes = div_factor(block_rsv->size, min_factor); |
3884 | if (block_rsv->reserved >= num_bytes) | |
3885 | ret = 0; | |
3886 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 3887 | |
36ba022a JB |
3888 | return ret; |
3889 | } | |
3890 | ||
aa38a711 MX |
3891 | static inline int __btrfs_block_rsv_refill(struct btrfs_root *root, |
3892 | struct btrfs_block_rsv *block_rsv, | |
3893 | u64 min_reserved, int flush) | |
36ba022a JB |
3894 | { |
3895 | u64 num_bytes = 0; | |
3896 | int ret = -ENOSPC; | |
3897 | ||
3898 | if (!block_rsv) | |
3899 | return 0; | |
3900 | ||
3901 | spin_lock(&block_rsv->lock); | |
3902 | num_bytes = min_reserved; | |
13553e52 | 3903 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 3904 | ret = 0; |
13553e52 | 3905 | else |
f0486c68 | 3906 | num_bytes -= block_rsv->reserved; |
f0486c68 | 3907 | spin_unlock(&block_rsv->lock); |
13553e52 | 3908 | |
f0486c68 YZ |
3909 | if (!ret) |
3910 | return 0; | |
3911 | ||
aa38a711 | 3912 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
3913 | if (!ret) { |
3914 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 3915 | return 0; |
6a63209f | 3916 | } |
9ed74f2d | 3917 | |
13553e52 | 3918 | return ret; |
f0486c68 YZ |
3919 | } |
3920 | ||
aa38a711 MX |
3921 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
3922 | struct btrfs_block_rsv *block_rsv, | |
3923 | u64 min_reserved) | |
3924 | { | |
3925 | return __btrfs_block_rsv_refill(root, block_rsv, min_reserved, 1); | |
3926 | } | |
3927 | ||
3928 | int btrfs_block_rsv_refill_noflush(struct btrfs_root *root, | |
3929 | struct btrfs_block_rsv *block_rsv, | |
3930 | u64 min_reserved) | |
3931 | { | |
3932 | return __btrfs_block_rsv_refill(root, block_rsv, min_reserved, 0); | |
3933 | } | |
3934 | ||
f0486c68 YZ |
3935 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, |
3936 | struct btrfs_block_rsv *dst_rsv, | |
3937 | u64 num_bytes) | |
3938 | { | |
3939 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3940 | } | |
3941 | ||
3942 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3943 | struct btrfs_block_rsv *block_rsv, | |
3944 | u64 num_bytes) | |
3945 | { | |
3946 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3947 | if (global_rsv->full || global_rsv == block_rsv || | |
3948 | block_rsv->space_info != global_rsv->space_info) | |
3949 | global_rsv = NULL; | |
3950 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
6a63209f JB |
3951 | } |
3952 | ||
3953 | /* | |
8929ecfa YZ |
3954 | * helper to calculate size of global block reservation. |
3955 | * the desired value is sum of space used by extent tree, | |
3956 | * checksum tree and root tree | |
6a63209f | 3957 | */ |
8929ecfa | 3958 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 3959 | { |
8929ecfa YZ |
3960 | struct btrfs_space_info *sinfo; |
3961 | u64 num_bytes; | |
3962 | u64 meta_used; | |
3963 | u64 data_used; | |
6c41761f | 3964 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 3965 | |
8929ecfa YZ |
3966 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
3967 | spin_lock(&sinfo->lock); | |
3968 | data_used = sinfo->bytes_used; | |
3969 | spin_unlock(&sinfo->lock); | |
33b4d47f | 3970 | |
8929ecfa YZ |
3971 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
3972 | spin_lock(&sinfo->lock); | |
6d48755d JB |
3973 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
3974 | data_used = 0; | |
8929ecfa YZ |
3975 | meta_used = sinfo->bytes_used; |
3976 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 3977 | |
8929ecfa YZ |
3978 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
3979 | csum_size * 2; | |
3980 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 3981 | |
8929ecfa YZ |
3982 | if (num_bytes * 3 > meta_used) |
3983 | num_bytes = div64_u64(meta_used, 3); | |
ab6e2410 | 3984 | |
8929ecfa YZ |
3985 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
3986 | } | |
6a63209f | 3987 | |
8929ecfa YZ |
3988 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
3989 | { | |
3990 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3991 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3992 | u64 num_bytes; | |
6a63209f | 3993 | |
8929ecfa | 3994 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 3995 | |
8929ecfa YZ |
3996 | spin_lock(&block_rsv->lock); |
3997 | spin_lock(&sinfo->lock); | |
4e06bdd6 | 3998 | |
8929ecfa | 3999 | block_rsv->size = num_bytes; |
4e06bdd6 | 4000 | |
8929ecfa | 4001 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4002 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4003 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4004 | |
4005 | if (sinfo->total_bytes > num_bytes) { | |
4006 | num_bytes = sinfo->total_bytes - num_bytes; | |
4007 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4008 | sinfo->bytes_may_use += num_bytes; |
6a63209f | 4009 | } |
6a63209f | 4010 | |
8929ecfa YZ |
4011 | if (block_rsv->reserved >= block_rsv->size) { |
4012 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4013 | sinfo->bytes_may_use -= num_bytes; |
36e39c40 | 4014 | sinfo->reservation_progress++; |
8929ecfa YZ |
4015 | block_rsv->reserved = block_rsv->size; |
4016 | block_rsv->full = 1; | |
4017 | } | |
182608c8 | 4018 | |
8929ecfa YZ |
4019 | spin_unlock(&sinfo->lock); |
4020 | spin_unlock(&block_rsv->lock); | |
6a63209f JB |
4021 | } |
4022 | ||
f0486c68 | 4023 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4024 | { |
f0486c68 | 4025 | struct btrfs_space_info *space_info; |
6a63209f | 4026 | |
f0486c68 YZ |
4027 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4028 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4029 | |
f0486c68 | 4030 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4031 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4032 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4033 | fs_info->trans_block_rsv.space_info = space_info; |
4034 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4035 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4036 | |
8929ecfa YZ |
4037 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4038 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4039 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4040 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4041 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4042 | |
8929ecfa | 4043 | update_global_block_rsv(fs_info); |
6a63209f JB |
4044 | } |
4045 | ||
8929ecfa | 4046 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4047 | { |
8929ecfa YZ |
4048 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); |
4049 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
4050 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4051 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4052 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4053 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4054 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4055 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4056 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4057 | } |
4058 | ||
a22285a6 YZ |
4059 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4060 | struct btrfs_root *root) | |
6a63209f | 4061 | { |
a22285a6 YZ |
4062 | if (!trans->bytes_reserved) |
4063 | return; | |
6a63209f | 4064 | |
b24e03db | 4065 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4066 | trans->bytes_reserved = 0; |
4067 | } | |
6a63209f | 4068 | |
d68fc57b YZ |
4069 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4070 | struct inode *inode) | |
4071 | { | |
4072 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4073 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4074 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4075 | ||
4076 | /* | |
fcb80c2a JB |
4077 | * We need to hold space in order to delete our orphan item once we've |
4078 | * added it, so this takes the reservation so we can release it later | |
4079 | * when we are truly done with the orphan item. | |
d68fc57b | 4080 | */ |
ff5714cc | 4081 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b | 4082 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4083 | } |
4084 | ||
d68fc57b | 4085 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4086 | { |
d68fc57b | 4087 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4088 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b YZ |
4089 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4090 | } | |
97e728d4 | 4091 | |
a22285a6 YZ |
4092 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
4093 | struct btrfs_pending_snapshot *pending) | |
4094 | { | |
4095 | struct btrfs_root *root = pending->root; | |
4096 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4097 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
4098 | /* | |
4099 | * two for root back/forward refs, two for directory entries | |
4100 | * and one for root of the snapshot. | |
4101 | */ | |
16cdcec7 | 4102 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5); |
a22285a6 YZ |
4103 | dst_rsv->space_info = src_rsv->space_info; |
4104 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
4105 | } |
4106 | ||
7709cde3 JB |
4107 | /** |
4108 | * drop_outstanding_extent - drop an outstanding extent | |
4109 | * @inode: the inode we're dropping the extent for | |
4110 | * | |
4111 | * This is called when we are freeing up an outstanding extent, either called | |
4112 | * after an error or after an extent is written. This will return the number of | |
4113 | * reserved extents that need to be freed. This must be called with | |
4114 | * BTRFS_I(inode)->lock held. | |
4115 | */ | |
9e0baf60 JB |
4116 | static unsigned drop_outstanding_extent(struct inode *inode) |
4117 | { | |
7fd2ae21 | 4118 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4119 | unsigned dropped_extents = 0; |
4120 | ||
9e0baf60 JB |
4121 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4122 | BTRFS_I(inode)->outstanding_extents--; | |
4123 | ||
7fd2ae21 JB |
4124 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
4125 | BTRFS_I(inode)->delalloc_meta_reserved) { | |
4126 | drop_inode_space = 1; | |
4127 | BTRFS_I(inode)->delalloc_meta_reserved = 0; | |
4128 | } | |
4129 | ||
9e0baf60 JB |
4130 | /* |
4131 | * If we have more or the same amount of outsanding extents than we have | |
4132 | * reserved then we need to leave the reserved extents count alone. | |
4133 | */ | |
4134 | if (BTRFS_I(inode)->outstanding_extents >= | |
4135 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4136 | return drop_inode_space; |
9e0baf60 JB |
4137 | |
4138 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4139 | BTRFS_I(inode)->outstanding_extents; | |
4140 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4141 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4142 | } |
4143 | ||
7709cde3 JB |
4144 | /** |
4145 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4146 | * reserved/free'd for the given bytes. | |
4147 | * @inode: the inode we're manipulating | |
4148 | * @num_bytes: the number of bytes in question | |
4149 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4150 | * | |
4151 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4152 | * correct amount of metadata that must either be reserved or freed. We | |
4153 | * calculate how many checksums we can fit into one leaf and then divide the | |
4154 | * number of bytes that will need to be checksumed by this value to figure out | |
4155 | * how many checksums will be required. If we are adding bytes then the number | |
4156 | * may go up and we will return the number of additional bytes that must be | |
4157 | * reserved. If it is going down we will return the number of bytes that must | |
4158 | * be freed. | |
4159 | * | |
4160 | * This must be called with BTRFS_I(inode)->lock held. | |
4161 | */ | |
4162 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4163 | int reserve) | |
6324fbf3 | 4164 | { |
7709cde3 JB |
4165 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4166 | u64 csum_size; | |
4167 | int num_csums_per_leaf; | |
4168 | int num_csums; | |
4169 | int old_csums; | |
4170 | ||
4171 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4172 | BTRFS_I(inode)->csum_bytes == 0) | |
4173 | return 0; | |
4174 | ||
4175 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4176 | if (reserve) | |
4177 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4178 | else | |
4179 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4180 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4181 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4182 | sizeof(struct btrfs_csum_item) + | |
4183 | sizeof(struct btrfs_disk_key)); | |
4184 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4185 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4186 | num_csums = num_csums / num_csums_per_leaf; | |
4187 | ||
4188 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4189 | old_csums = old_csums / num_csums_per_leaf; | |
4190 | ||
4191 | /* No change, no need to reserve more */ | |
4192 | if (old_csums == num_csums) | |
4193 | return 0; | |
4194 | ||
4195 | if (reserve) | |
4196 | return btrfs_calc_trans_metadata_size(root, | |
4197 | num_csums - old_csums); | |
4198 | ||
4199 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4200 | } |
c146afad | 4201 | |
0ca1f7ce YZ |
4202 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4203 | { | |
4204 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4205 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4206 | u64 to_reserve = 0; |
660d3f6c | 4207 | u64 csum_bytes; |
9e0baf60 | 4208 | unsigned nr_extents = 0; |
660d3f6c | 4209 | int extra_reserve = 0; |
c09544e0 | 4210 | int flush = 1; |
0ca1f7ce | 4211 | int ret; |
6324fbf3 | 4212 | |
660d3f6c | 4213 | /* Need to be holding the i_mutex here if we aren't free space cache */ |
c09544e0 JB |
4214 | if (btrfs_is_free_space_inode(root, inode)) |
4215 | flush = 0; | |
660d3f6c JB |
4216 | else |
4217 | WARN_ON(!mutex_is_locked(&inode->i_mutex)); | |
c09544e0 JB |
4218 | |
4219 | if (flush && btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4220 | schedule_timeout(1); |
ec44a35c | 4221 | |
0ca1f7ce | 4222 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4223 | |
9e0baf60 JB |
4224 | spin_lock(&BTRFS_I(inode)->lock); |
4225 | BTRFS_I(inode)->outstanding_extents++; | |
4226 | ||
4227 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4228 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4229 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4230 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4231 | |
7fd2ae21 JB |
4232 | /* |
4233 | * Add an item to reserve for updating the inode when we complete the | |
4234 | * delalloc io. | |
4235 | */ | |
4236 | if (!BTRFS_I(inode)->delalloc_meta_reserved) { | |
4237 | nr_extents++; | |
660d3f6c | 4238 | extra_reserve = 1; |
593060d7 | 4239 | } |
7fd2ae21 JB |
4240 | |
4241 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4242 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4243 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4244 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4245 | |
36ba022a | 4246 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
9e0baf60 | 4247 | if (ret) { |
7ed49f18 | 4248 | u64 to_free = 0; |
9e0baf60 | 4249 | unsigned dropped; |
7ed49f18 | 4250 | |
7709cde3 | 4251 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4252 | dropped = drop_outstanding_extent(inode); |
9e0baf60 | 4253 | /* |
660d3f6c JB |
4254 | * If the inodes csum_bytes is the same as the original |
4255 | * csum_bytes then we know we haven't raced with any free()ers | |
4256 | * so we can just reduce our inodes csum bytes and carry on. | |
4257 | * Otherwise we have to do the normal free thing to account for | |
4258 | * the case that the free side didn't free up its reserve | |
4259 | * because of this outstanding reservation. | |
9e0baf60 | 4260 | */ |
660d3f6c JB |
4261 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) |
4262 | calc_csum_metadata_size(inode, num_bytes, 0); | |
4263 | else | |
4264 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
4265 | spin_unlock(&BTRFS_I(inode)->lock); | |
4266 | if (dropped) | |
4267 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
4268 | ||
7ed49f18 JB |
4269 | if (to_free) |
4270 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
0ca1f7ce | 4271 | return ret; |
9e0baf60 | 4272 | } |
25179201 | 4273 | |
660d3f6c JB |
4274 | spin_lock(&BTRFS_I(inode)->lock); |
4275 | if (extra_reserve) { | |
4276 | BTRFS_I(inode)->delalloc_meta_reserved = 1; | |
4277 | nr_extents--; | |
4278 | } | |
4279 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4280 | spin_unlock(&BTRFS_I(inode)->lock); | |
4281 | ||
0ca1f7ce YZ |
4282 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4283 | ||
0ca1f7ce YZ |
4284 | return 0; |
4285 | } | |
4286 | ||
7709cde3 JB |
4287 | /** |
4288 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
4289 | * @inode: the inode to release the reservation for | |
4290 | * @num_bytes: the number of bytes we're releasing | |
4291 | * | |
4292 | * This will release the metadata reservation for an inode. This can be called | |
4293 | * once we complete IO for a given set of bytes to release their metadata | |
4294 | * reservations. | |
4295 | */ | |
0ca1f7ce YZ |
4296 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
4297 | { | |
4298 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
4299 | u64 to_free = 0; |
4300 | unsigned dropped; | |
0ca1f7ce YZ |
4301 | |
4302 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 4303 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4304 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 4305 | |
7709cde3 JB |
4306 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
4307 | spin_unlock(&BTRFS_I(inode)->lock); | |
9e0baf60 JB |
4308 | if (dropped > 0) |
4309 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce YZ |
4310 | |
4311 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
4312 | to_free); | |
4313 | } | |
4314 | ||
7709cde3 JB |
4315 | /** |
4316 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
4317 | * @inode: inode we're writing to | |
4318 | * @num_bytes: the number of bytes we want to allocate | |
4319 | * | |
4320 | * This will do the following things | |
4321 | * | |
4322 | * o reserve space in the data space info for num_bytes | |
4323 | * o reserve space in the metadata space info based on number of outstanding | |
4324 | * extents and how much csums will be needed | |
4325 | * o add to the inodes ->delalloc_bytes | |
4326 | * o add it to the fs_info's delalloc inodes list. | |
4327 | * | |
4328 | * This will return 0 for success and -ENOSPC if there is no space left. | |
4329 | */ | |
0ca1f7ce YZ |
4330 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
4331 | { | |
4332 | int ret; | |
4333 | ||
4334 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4335 | if (ret) |
0ca1f7ce YZ |
4336 | return ret; |
4337 | ||
4338 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4339 | if (ret) { | |
4340 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4341 | return ret; | |
4342 | } | |
4343 | ||
4344 | return 0; | |
4345 | } | |
4346 | ||
7709cde3 JB |
4347 | /** |
4348 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
4349 | * @inode: inode we're releasing space for | |
4350 | * @num_bytes: the number of bytes we want to free up | |
4351 | * | |
4352 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
4353 | * called in the case that we don't need the metadata AND data reservations | |
4354 | * anymore. So if there is an error or we insert an inline extent. | |
4355 | * | |
4356 | * This function will release the metadata space that was not used and will | |
4357 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
4358 | * list if there are no delalloc bytes left. | |
4359 | */ | |
0ca1f7ce YZ |
4360 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
4361 | { | |
4362 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4363 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4364 | } |
4365 | ||
9078a3e1 CM |
4366 | static int update_block_group(struct btrfs_trans_handle *trans, |
4367 | struct btrfs_root *root, | |
f0486c68 | 4368 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4369 | { |
0af3d00b | 4370 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4371 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4372 | u64 total = num_bytes; |
9078a3e1 | 4373 | u64 old_val; |
db94535d | 4374 | u64 byte_in_group; |
0af3d00b | 4375 | int factor; |
3e1ad54f | 4376 | |
5d4f98a2 YZ |
4377 | /* block accounting for super block */ |
4378 | spin_lock(&info->delalloc_lock); | |
6c41761f | 4379 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
4380 | if (alloc) |
4381 | old_val += num_bytes; | |
4382 | else | |
4383 | old_val -= num_bytes; | |
6c41761f | 4384 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
5d4f98a2 YZ |
4385 | spin_unlock(&info->delalloc_lock); |
4386 | ||
d397712b | 4387 | while (total) { |
db94535d | 4388 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4389 | if (!cache) |
9078a3e1 | 4390 | return -1; |
b742bb82 YZ |
4391 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4392 | BTRFS_BLOCK_GROUP_RAID1 | | |
4393 | BTRFS_BLOCK_GROUP_RAID10)) | |
4394 | factor = 2; | |
4395 | else | |
4396 | factor = 1; | |
9d66e233 JB |
4397 | /* |
4398 | * If this block group has free space cache written out, we | |
4399 | * need to make sure to load it if we are removing space. This | |
4400 | * is because we need the unpinning stage to actually add the | |
4401 | * space back to the block group, otherwise we will leak space. | |
4402 | */ | |
4403 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
b8399dee | 4404 | cache_block_group(cache, trans, NULL, 1); |
0af3d00b | 4405 | |
db94535d CM |
4406 | byte_in_group = bytenr - cache->key.objectid; |
4407 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4408 | |
25179201 | 4409 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4410 | spin_lock(&cache->lock); |
0af3d00b | 4411 | |
73bc1876 | 4412 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
4413 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
4414 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4415 | ||
0f9dd46c | 4416 | cache->dirty = 1; |
9078a3e1 | 4417 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4418 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4419 | if (alloc) { |
db94535d | 4420 | old_val += num_bytes; |
11833d66 YZ |
4421 | btrfs_set_block_group_used(&cache->item, old_val); |
4422 | cache->reserved -= num_bytes; | |
11833d66 | 4423 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
4424 | cache->space_info->bytes_used += num_bytes; |
4425 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4426 | spin_unlock(&cache->lock); |
25179201 | 4427 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4428 | } else { |
db94535d | 4429 | old_val -= num_bytes; |
c286ac48 | 4430 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4431 | cache->pinned += num_bytes; |
4432 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4433 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4434 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4435 | spin_unlock(&cache->lock); |
25179201 | 4436 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4437 | |
f0486c68 YZ |
4438 | set_extent_dirty(info->pinned_extents, |
4439 | bytenr, bytenr + num_bytes - 1, | |
4440 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4441 | } |
fa9c0d79 | 4442 | btrfs_put_block_group(cache); |
db94535d CM |
4443 | total -= num_bytes; |
4444 | bytenr += num_bytes; | |
9078a3e1 CM |
4445 | } |
4446 | return 0; | |
4447 | } | |
6324fbf3 | 4448 | |
a061fc8d CM |
4449 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4450 | { | |
0f9dd46c | 4451 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4452 | u64 bytenr; |
0f9dd46c JB |
4453 | |
4454 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
4455 | if (!cache) | |
a061fc8d | 4456 | return 0; |
0f9dd46c | 4457 | |
d2fb3437 | 4458 | bytenr = cache->key.objectid; |
fa9c0d79 | 4459 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4460 | |
4461 | return bytenr; | |
a061fc8d CM |
4462 | } |
4463 | ||
f0486c68 YZ |
4464 | static int pin_down_extent(struct btrfs_root *root, |
4465 | struct btrfs_block_group_cache *cache, | |
4466 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4467 | { |
11833d66 YZ |
4468 | spin_lock(&cache->space_info->lock); |
4469 | spin_lock(&cache->lock); | |
4470 | cache->pinned += num_bytes; | |
4471 | cache->space_info->bytes_pinned += num_bytes; | |
4472 | if (reserved) { | |
4473 | cache->reserved -= num_bytes; | |
4474 | cache->space_info->bytes_reserved -= num_bytes; | |
4475 | } | |
4476 | spin_unlock(&cache->lock); | |
4477 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4478 | |
f0486c68 YZ |
4479 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4480 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4481 | return 0; | |
4482 | } | |
68b38550 | 4483 | |
f0486c68 YZ |
4484 | /* |
4485 | * this function must be called within transaction | |
4486 | */ | |
4487 | int btrfs_pin_extent(struct btrfs_root *root, | |
4488 | u64 bytenr, u64 num_bytes, int reserved) | |
4489 | { | |
4490 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4491 | |
f0486c68 YZ |
4492 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
4493 | BUG_ON(!cache); | |
4494 | ||
4495 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4496 | ||
4497 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4498 | return 0; |
4499 | } | |
4500 | ||
f0486c68 | 4501 | /* |
e688b725 CM |
4502 | * this function must be called within transaction |
4503 | */ | |
4504 | int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans, | |
4505 | struct btrfs_root *root, | |
4506 | u64 bytenr, u64 num_bytes) | |
4507 | { | |
4508 | struct btrfs_block_group_cache *cache; | |
4509 | ||
4510 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
4511 | BUG_ON(!cache); | |
4512 | ||
4513 | /* | |
4514 | * pull in the free space cache (if any) so that our pin | |
4515 | * removes the free space from the cache. We have load_only set | |
4516 | * to one because the slow code to read in the free extents does check | |
4517 | * the pinned extents. | |
4518 | */ | |
4519 | cache_block_group(cache, trans, root, 1); | |
4520 | ||
4521 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
4522 | ||
4523 | /* remove us from the free space cache (if we're there at all) */ | |
4524 | btrfs_remove_free_space(cache, bytenr, num_bytes); | |
4525 | btrfs_put_block_group(cache); | |
4526 | return 0; | |
4527 | } | |
4528 | ||
fb25e914 JB |
4529 | /** |
4530 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
4531 | * @cache: The cache we are manipulating | |
4532 | * @num_bytes: The number of bytes in question | |
4533 | * @reserve: One of the reservation enums | |
4534 | * | |
4535 | * This is called by the allocator when it reserves space, or by somebody who is | |
4536 | * freeing space that was never actually used on disk. For example if you | |
4537 | * reserve some space for a new leaf in transaction A and before transaction A | |
4538 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
4539 | * clear the reservation. | |
4540 | * | |
4541 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
4542 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
4543 | * delalloc bits in the io_tree. We have to do this since we could end up | |
4544 | * allocating less disk space for the amount of data we have reserved in the | |
4545 | * case of compression. | |
4546 | * | |
4547 | * If this is a reservation and the block group has become read only we cannot | |
4548 | * make the reservation and return -EAGAIN, otherwise this function always | |
4549 | * succeeds. | |
f0486c68 | 4550 | */ |
fb25e914 JB |
4551 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
4552 | u64 num_bytes, int reserve) | |
11833d66 | 4553 | { |
fb25e914 | 4554 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 4555 | int ret = 0; |
fb25e914 JB |
4556 | spin_lock(&space_info->lock); |
4557 | spin_lock(&cache->lock); | |
4558 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
4559 | if (cache->ro) { |
4560 | ret = -EAGAIN; | |
4561 | } else { | |
fb25e914 JB |
4562 | cache->reserved += num_bytes; |
4563 | space_info->bytes_reserved += num_bytes; | |
4564 | if (reserve == RESERVE_ALLOC) { | |
4565 | BUG_ON(space_info->bytes_may_use < num_bytes); | |
4566 | space_info->bytes_may_use -= num_bytes; | |
4567 | } | |
f0486c68 | 4568 | } |
fb25e914 JB |
4569 | } else { |
4570 | if (cache->ro) | |
4571 | space_info->bytes_readonly += num_bytes; | |
4572 | cache->reserved -= num_bytes; | |
4573 | space_info->bytes_reserved -= num_bytes; | |
4574 | space_info->reservation_progress++; | |
324ae4df | 4575 | } |
fb25e914 JB |
4576 | spin_unlock(&cache->lock); |
4577 | spin_unlock(&space_info->lock); | |
f0486c68 | 4578 | return ret; |
324ae4df | 4579 | } |
9078a3e1 | 4580 | |
11833d66 YZ |
4581 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
4582 | struct btrfs_root *root) | |
e8569813 | 4583 | { |
e8569813 | 4584 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
4585 | struct btrfs_caching_control *next; |
4586 | struct btrfs_caching_control *caching_ctl; | |
4587 | struct btrfs_block_group_cache *cache; | |
e8569813 | 4588 | |
11833d66 | 4589 | down_write(&fs_info->extent_commit_sem); |
25179201 | 4590 | |
11833d66 YZ |
4591 | list_for_each_entry_safe(caching_ctl, next, |
4592 | &fs_info->caching_block_groups, list) { | |
4593 | cache = caching_ctl->block_group; | |
4594 | if (block_group_cache_done(cache)) { | |
4595 | cache->last_byte_to_unpin = (u64)-1; | |
4596 | list_del_init(&caching_ctl->list); | |
4597 | put_caching_control(caching_ctl); | |
e8569813 | 4598 | } else { |
11833d66 | 4599 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 4600 | } |
e8569813 | 4601 | } |
11833d66 YZ |
4602 | |
4603 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
4604 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
4605 | else | |
4606 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
4607 | ||
4608 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
4609 | |
4610 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
4611 | return 0; |
4612 | } | |
4613 | ||
11833d66 | 4614 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 4615 | { |
11833d66 YZ |
4616 | struct btrfs_fs_info *fs_info = root->fs_info; |
4617 | struct btrfs_block_group_cache *cache = NULL; | |
4618 | u64 len; | |
ccd467d6 | 4619 | |
11833d66 YZ |
4620 | while (start <= end) { |
4621 | if (!cache || | |
4622 | start >= cache->key.objectid + cache->key.offset) { | |
4623 | if (cache) | |
4624 | btrfs_put_block_group(cache); | |
4625 | cache = btrfs_lookup_block_group(fs_info, start); | |
4626 | BUG_ON(!cache); | |
4627 | } | |
4628 | ||
4629 | len = cache->key.objectid + cache->key.offset - start; | |
4630 | len = min(len, end + 1 - start); | |
4631 | ||
4632 | if (start < cache->last_byte_to_unpin) { | |
4633 | len = min(len, cache->last_byte_to_unpin - start); | |
4634 | btrfs_add_free_space(cache, start, len); | |
4635 | } | |
4636 | ||
f0486c68 YZ |
4637 | start += len; |
4638 | ||
11833d66 YZ |
4639 | spin_lock(&cache->space_info->lock); |
4640 | spin_lock(&cache->lock); | |
4641 | cache->pinned -= len; | |
4642 | cache->space_info->bytes_pinned -= len; | |
37be25bc | 4643 | if (cache->ro) |
f0486c68 | 4644 | cache->space_info->bytes_readonly += len; |
11833d66 YZ |
4645 | spin_unlock(&cache->lock); |
4646 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 4647 | } |
11833d66 YZ |
4648 | |
4649 | if (cache) | |
4650 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
4651 | return 0; |
4652 | } | |
4653 | ||
4654 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 4655 | struct btrfs_root *root) |
a28ec197 | 4656 | { |
11833d66 YZ |
4657 | struct btrfs_fs_info *fs_info = root->fs_info; |
4658 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
4659 | u64 start; |
4660 | u64 end; | |
a28ec197 | 4661 | int ret; |
a28ec197 | 4662 | |
11833d66 YZ |
4663 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4664 | unpin = &fs_info->freed_extents[1]; | |
4665 | else | |
4666 | unpin = &fs_info->freed_extents[0]; | |
4667 | ||
d397712b | 4668 | while (1) { |
1a5bc167 CM |
4669 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4670 | EXTENT_DIRTY); | |
4671 | if (ret) | |
a28ec197 | 4672 | break; |
1f3c79a2 | 4673 | |
5378e607 LD |
4674 | if (btrfs_test_opt(root, DISCARD)) |
4675 | ret = btrfs_discard_extent(root, start, | |
4676 | end + 1 - start, NULL); | |
1f3c79a2 | 4677 | |
1a5bc167 | 4678 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4679 | unpin_extent_range(root, start, end); |
b9473439 | 4680 | cond_resched(); |
a28ec197 | 4681 | } |
817d52f8 | 4682 | |
e20d96d6 CM |
4683 | return 0; |
4684 | } | |
4685 | ||
5d4f98a2 YZ |
4686 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4687 | struct btrfs_root *root, | |
4688 | u64 bytenr, u64 num_bytes, u64 parent, | |
4689 | u64 root_objectid, u64 owner_objectid, | |
4690 | u64 owner_offset, int refs_to_drop, | |
4691 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4692 | { |
e2fa7227 | 4693 | struct btrfs_key key; |
5d4f98a2 | 4694 | struct btrfs_path *path; |
1261ec42 CM |
4695 | struct btrfs_fs_info *info = root->fs_info; |
4696 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4697 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4698 | struct btrfs_extent_item *ei; |
4699 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4700 | int ret; |
5d4f98a2 | 4701 | int is_data; |
952fccac CM |
4702 | int extent_slot = 0; |
4703 | int found_extent = 0; | |
4704 | int num_to_del = 1; | |
5d4f98a2 YZ |
4705 | u32 item_size; |
4706 | u64 refs; | |
037e6390 | 4707 | |
5caf2a00 | 4708 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4709 | if (!path) |
4710 | return -ENOMEM; | |
5f26f772 | 4711 | |
3c12ac72 | 4712 | path->reada = 1; |
b9473439 | 4713 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4714 | |
4715 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4716 | BUG_ON(!is_data && refs_to_drop != 1); | |
4717 | ||
4718 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4719 | bytenr, num_bytes, parent, | |
4720 | root_objectid, owner_objectid, | |
4721 | owner_offset); | |
7bb86316 | 4722 | if (ret == 0) { |
952fccac | 4723 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4724 | while (extent_slot >= 0) { |
4725 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4726 | extent_slot); |
5d4f98a2 | 4727 | if (key.objectid != bytenr) |
952fccac | 4728 | break; |
5d4f98a2 YZ |
4729 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4730 | key.offset == num_bytes) { | |
952fccac CM |
4731 | found_extent = 1; |
4732 | break; | |
4733 | } | |
4734 | if (path->slots[0] - extent_slot > 5) | |
4735 | break; | |
5d4f98a2 | 4736 | extent_slot--; |
952fccac | 4737 | } |
5d4f98a2 YZ |
4738 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4739 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4740 | if (found_extent && item_size < sizeof(*ei)) | |
4741 | found_extent = 0; | |
4742 | #endif | |
31840ae1 | 4743 | if (!found_extent) { |
5d4f98a2 | 4744 | BUG_ON(iref); |
56bec294 | 4745 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4746 | NULL, refs_to_drop, |
4747 | is_data); | |
31840ae1 | 4748 | BUG_ON(ret); |
b3b4aa74 | 4749 | btrfs_release_path(path); |
b9473439 | 4750 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4751 | |
4752 | key.objectid = bytenr; | |
4753 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4754 | key.offset = num_bytes; | |
4755 | ||
31840ae1 ZY |
4756 | ret = btrfs_search_slot(trans, extent_root, |
4757 | &key, path, -1, 1); | |
f3465ca4 JB |
4758 | if (ret) { |
4759 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4760 | ", was looking for %llu\n", ret, |
4761 | (unsigned long long)bytenr); | |
b783e62d JB |
4762 | if (ret > 0) |
4763 | btrfs_print_leaf(extent_root, | |
4764 | path->nodes[0]); | |
f3465ca4 | 4765 | } |
31840ae1 ZY |
4766 | BUG_ON(ret); |
4767 | extent_slot = path->slots[0]; | |
4768 | } | |
7bb86316 CM |
4769 | } else { |
4770 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4771 | WARN_ON(1); | |
d397712b | 4772 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4773 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4774 | (unsigned long long)bytenr, |
56bec294 | 4775 | (unsigned long long)parent, |
d397712b | 4776 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4777 | (unsigned long long)owner_objectid, |
4778 | (unsigned long long)owner_offset); | |
7bb86316 | 4779 | } |
5f39d397 CM |
4780 | |
4781 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4782 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4783 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4784 | if (item_size < sizeof(*ei)) { | |
4785 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4786 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4787 | owner_objectid, 0); | |
4788 | BUG_ON(ret < 0); | |
4789 | ||
b3b4aa74 | 4790 | btrfs_release_path(path); |
5d4f98a2 YZ |
4791 | path->leave_spinning = 1; |
4792 | ||
4793 | key.objectid = bytenr; | |
4794 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4795 | key.offset = num_bytes; | |
4796 | ||
4797 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4798 | -1, 1); | |
4799 | if (ret) { | |
4800 | printk(KERN_ERR "umm, got %d back from search" | |
4801 | ", was looking for %llu\n", ret, | |
4802 | (unsigned long long)bytenr); | |
4803 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4804 | } | |
4805 | BUG_ON(ret); | |
4806 | extent_slot = path->slots[0]; | |
4807 | leaf = path->nodes[0]; | |
4808 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4809 | } | |
4810 | #endif | |
4811 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4812 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4813 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4814 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4815 | struct btrfs_tree_block_info *bi; | |
4816 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4817 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4818 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4819 | } | |
56bec294 | 4820 | |
5d4f98a2 | 4821 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4822 | BUG_ON(refs < refs_to_drop); |
4823 | refs -= refs_to_drop; | |
5f39d397 | 4824 | |
5d4f98a2 YZ |
4825 | if (refs > 0) { |
4826 | if (extent_op) | |
4827 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4828 | /* | |
4829 | * In the case of inline back ref, reference count will | |
4830 | * be updated by remove_extent_backref | |
952fccac | 4831 | */ |
5d4f98a2 YZ |
4832 | if (iref) { |
4833 | BUG_ON(!found_extent); | |
4834 | } else { | |
4835 | btrfs_set_extent_refs(leaf, ei, refs); | |
4836 | btrfs_mark_buffer_dirty(leaf); | |
4837 | } | |
4838 | if (found_extent) { | |
4839 | ret = remove_extent_backref(trans, extent_root, path, | |
4840 | iref, refs_to_drop, | |
4841 | is_data); | |
952fccac CM |
4842 | BUG_ON(ret); |
4843 | } | |
5d4f98a2 | 4844 | } else { |
5d4f98a2 YZ |
4845 | if (found_extent) { |
4846 | BUG_ON(is_data && refs_to_drop != | |
4847 | extent_data_ref_count(root, path, iref)); | |
4848 | if (iref) { | |
4849 | BUG_ON(path->slots[0] != extent_slot); | |
4850 | } else { | |
4851 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4852 | path->slots[0] = extent_slot; | |
4853 | num_to_del = 2; | |
4854 | } | |
78fae27e | 4855 | } |
b9473439 | 4856 | |
952fccac CM |
4857 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4858 | num_to_del); | |
31840ae1 | 4859 | BUG_ON(ret); |
b3b4aa74 | 4860 | btrfs_release_path(path); |
21af804c | 4861 | |
5d4f98a2 | 4862 | if (is_data) { |
459931ec CM |
4863 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4864 | BUG_ON(ret); | |
d57e62b8 CM |
4865 | } else { |
4866 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4867 | bytenr >> PAGE_CACHE_SHIFT, | |
4868 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4869 | } |
4870 | ||
f0486c68 | 4871 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4872 | BUG_ON(ret); |
a28ec197 | 4873 | } |
5caf2a00 | 4874 | btrfs_free_path(path); |
a28ec197 CM |
4875 | return ret; |
4876 | } | |
4877 | ||
1887be66 | 4878 | /* |
f0486c68 | 4879 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4880 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4881 | * a given extent, and if there are no other delayed refs to be processed, it | |
4882 | * removes it from the tree. | |
4883 | */ | |
4884 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4885 | struct btrfs_root *root, u64 bytenr) | |
4886 | { | |
4887 | struct btrfs_delayed_ref_head *head; | |
4888 | struct btrfs_delayed_ref_root *delayed_refs; | |
4889 | struct btrfs_delayed_ref_node *ref; | |
4890 | struct rb_node *node; | |
f0486c68 | 4891 | int ret = 0; |
1887be66 CM |
4892 | |
4893 | delayed_refs = &trans->transaction->delayed_refs; | |
4894 | spin_lock(&delayed_refs->lock); | |
4895 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4896 | if (!head) | |
4897 | goto out; | |
4898 | ||
4899 | node = rb_prev(&head->node.rb_node); | |
4900 | if (!node) | |
4901 | goto out; | |
4902 | ||
4903 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4904 | ||
4905 | /* there are still entries for this ref, we can't drop it */ | |
4906 | if (ref->bytenr == bytenr) | |
4907 | goto out; | |
4908 | ||
5d4f98a2 YZ |
4909 | if (head->extent_op) { |
4910 | if (!head->must_insert_reserved) | |
4911 | goto out; | |
4912 | kfree(head->extent_op); | |
4913 | head->extent_op = NULL; | |
4914 | } | |
4915 | ||
1887be66 CM |
4916 | /* |
4917 | * waiting for the lock here would deadlock. If someone else has it | |
4918 | * locked they are already in the process of dropping it anyway | |
4919 | */ | |
4920 | if (!mutex_trylock(&head->mutex)) | |
4921 | goto out; | |
4922 | ||
4923 | /* | |
4924 | * at this point we have a head with no other entries. Go | |
4925 | * ahead and process it. | |
4926 | */ | |
4927 | head->node.in_tree = 0; | |
4928 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4929 | |
1887be66 CM |
4930 | delayed_refs->num_entries--; |
4931 | ||
4932 | /* | |
4933 | * we don't take a ref on the node because we're removing it from the | |
4934 | * tree, so we just steal the ref the tree was holding. | |
4935 | */ | |
c3e69d58 CM |
4936 | delayed_refs->num_heads--; |
4937 | if (list_empty(&head->cluster)) | |
4938 | delayed_refs->num_heads_ready--; | |
4939 | ||
4940 | list_del_init(&head->cluster); | |
1887be66 CM |
4941 | spin_unlock(&delayed_refs->lock); |
4942 | ||
f0486c68 YZ |
4943 | BUG_ON(head->extent_op); |
4944 | if (head->must_insert_reserved) | |
4945 | ret = 1; | |
4946 | ||
4947 | mutex_unlock(&head->mutex); | |
1887be66 | 4948 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4949 | return ret; |
1887be66 CM |
4950 | out: |
4951 | spin_unlock(&delayed_refs->lock); | |
4952 | return 0; | |
4953 | } | |
4954 | ||
f0486c68 YZ |
4955 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4956 | struct btrfs_root *root, | |
4957 | struct extent_buffer *buf, | |
4958 | u64 parent, int last_ref) | |
4959 | { | |
f0486c68 YZ |
4960 | struct btrfs_block_group_cache *cache = NULL; |
4961 | int ret; | |
4962 | ||
4963 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4964 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4965 | parent, root->root_key.objectid, | |
4966 | btrfs_header_level(buf), | |
4967 | BTRFS_DROP_DELAYED_REF, NULL); | |
4968 | BUG_ON(ret); | |
4969 | } | |
4970 | ||
4971 | if (!last_ref) | |
4972 | return; | |
4973 | ||
f0486c68 | 4974 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
4975 | |
4976 | if (btrfs_header_generation(buf) == trans->transid) { | |
4977 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4978 | ret = check_ref_cleanup(trans, root, buf->start); | |
4979 | if (!ret) | |
37be25bc | 4980 | goto out; |
f0486c68 YZ |
4981 | } |
4982 | ||
4983 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4984 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 4985 | goto out; |
f0486c68 YZ |
4986 | } |
4987 | ||
4988 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4989 | ||
4990 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 4991 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
f0486c68 YZ |
4992 | } |
4993 | out: | |
a826d6dc JB |
4994 | /* |
4995 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
4996 | * anymore. | |
4997 | */ | |
4998 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
4999 | btrfs_put_block_group(cache); |
5000 | } | |
5001 | ||
925baedd | 5002 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
5003 | struct btrfs_root *root, |
5004 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 5005 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
5006 | { |
5007 | int ret; | |
5008 | ||
56bec294 CM |
5009 | /* |
5010 | * tree log blocks never actually go into the extent allocation | |
5011 | * tree, just update pinning info and exit early. | |
56bec294 | 5012 | */ |
5d4f98a2 YZ |
5013 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
5014 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 5015 | /* unlocks the pinned mutex */ |
11833d66 | 5016 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 5017 | ret = 0; |
5d4f98a2 YZ |
5018 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
5019 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
5020 | parent, root_objectid, (int)owner, | |
5021 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 5022 | BUG_ON(ret); |
5d4f98a2 YZ |
5023 | } else { |
5024 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
5025 | parent, root_objectid, owner, | |
5026 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
5027 | BUG_ON(ret); | |
56bec294 | 5028 | } |
925baedd CM |
5029 | return ret; |
5030 | } | |
5031 | ||
87ee04eb CM |
5032 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
5033 | { | |
5034 | u64 mask = ((u64)root->stripesize - 1); | |
5035 | u64 ret = (val + mask) & ~mask; | |
5036 | return ret; | |
5037 | } | |
5038 | ||
817d52f8 JB |
5039 | /* |
5040 | * when we wait for progress in the block group caching, its because | |
5041 | * our allocation attempt failed at least once. So, we must sleep | |
5042 | * and let some progress happen before we try again. | |
5043 | * | |
5044 | * This function will sleep at least once waiting for new free space to | |
5045 | * show up, and then it will check the block group free space numbers | |
5046 | * for our min num_bytes. Another option is to have it go ahead | |
5047 | * and look in the rbtree for a free extent of a given size, but this | |
5048 | * is a good start. | |
5049 | */ | |
5050 | static noinline int | |
5051 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
5052 | u64 num_bytes) | |
5053 | { | |
11833d66 | 5054 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
5055 | DEFINE_WAIT(wait); |
5056 | ||
11833d66 YZ |
5057 | caching_ctl = get_caching_control(cache); |
5058 | if (!caching_ctl) | |
817d52f8 | 5059 | return 0; |
817d52f8 | 5060 | |
11833d66 | 5061 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 5062 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
5063 | |
5064 | put_caching_control(caching_ctl); | |
5065 | return 0; | |
5066 | } | |
5067 | ||
5068 | static noinline int | |
5069 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
5070 | { | |
5071 | struct btrfs_caching_control *caching_ctl; | |
5072 | DEFINE_WAIT(wait); | |
5073 | ||
5074 | caching_ctl = get_caching_control(cache); | |
5075 | if (!caching_ctl) | |
5076 | return 0; | |
5077 | ||
5078 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
5079 | ||
5080 | put_caching_control(caching_ctl); | |
817d52f8 JB |
5081 | return 0; |
5082 | } | |
5083 | ||
b742bb82 YZ |
5084 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
5085 | { | |
5086 | int index; | |
5087 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
5088 | index = 0; | |
5089 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
5090 | index = 1; | |
5091 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
5092 | index = 2; | |
5093 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
5094 | index = 3; | |
5095 | else | |
5096 | index = 4; | |
5097 | return index; | |
5098 | } | |
5099 | ||
817d52f8 | 5100 | enum btrfs_loop_type { |
ccf0e725 | 5101 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
5102 | LOOP_CACHING_NOWAIT = 1, |
5103 | LOOP_CACHING_WAIT = 2, | |
5104 | LOOP_ALLOC_CHUNK = 3, | |
5105 | LOOP_NO_EMPTY_SIZE = 4, | |
5106 | }; | |
5107 | ||
fec577fb CM |
5108 | /* |
5109 | * walks the btree of allocated extents and find a hole of a given size. | |
5110 | * The key ins is changed to record the hole: | |
5111 | * ins->objectid == block start | |
62e2749e | 5112 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
5113 | * ins->offset == number of blocks |
5114 | * Any available blocks before search_start are skipped. | |
5115 | */ | |
d397712b | 5116 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
5117 | struct btrfs_root *orig_root, |
5118 | u64 num_bytes, u64 empty_size, | |
5119 | u64 search_start, u64 search_end, | |
5120 | u64 hint_byte, struct btrfs_key *ins, | |
e0f54067 | 5121 | u64 data) |
fec577fb | 5122 | { |
80eb234a | 5123 | int ret = 0; |
d397712b | 5124 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 5125 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 5126 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 5127 | struct btrfs_block_group_cache *used_block_group; |
239b14b3 | 5128 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 5129 | int allowed_chunk_alloc = 0; |
ccf0e725 | 5130 | int done_chunk_alloc = 0; |
80eb234a | 5131 | struct btrfs_space_info *space_info; |
fa9c0d79 | 5132 | int loop = 0; |
f0486c68 | 5133 | int index = 0; |
fb25e914 JB |
5134 | int alloc_type = (data & BTRFS_BLOCK_GROUP_DATA) ? |
5135 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
817d52f8 | 5136 | bool found_uncached_bg = false; |
0a24325e | 5137 | bool failed_cluster_refill = false; |
1cdda9b8 | 5138 | bool failed_alloc = false; |
67377734 | 5139 | bool use_cluster = true; |
60d2adbb | 5140 | bool have_caching_bg = false; |
ccf0e725 JB |
5141 | u64 ideal_cache_percent = 0; |
5142 | u64 ideal_cache_offset = 0; | |
fec577fb | 5143 | |
db94535d | 5144 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 5145 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
5146 | ins->objectid = 0; |
5147 | ins->offset = 0; | |
b1a4d965 | 5148 | |
2552d17e | 5149 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 | 5150 | if (!space_info) { |
e0f54067 | 5151 | printk(KERN_ERR "No space info for %llu\n", data); |
1b1d1f66 JB |
5152 | return -ENOSPC; |
5153 | } | |
2552d17e | 5154 | |
67377734 JB |
5155 | /* |
5156 | * If the space info is for both data and metadata it means we have a | |
5157 | * small filesystem and we can't use the clustering stuff. | |
5158 | */ | |
5159 | if (btrfs_mixed_space_info(space_info)) | |
5160 | use_cluster = false; | |
5161 | ||
0ef3e66b CM |
5162 | if (orig_root->ref_cows || empty_size) |
5163 | allowed_chunk_alloc = 1; | |
5164 | ||
67377734 | 5165 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 5166 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
5167 | if (!btrfs_test_opt(root, SSD)) |
5168 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
5169 | } |
5170 | ||
67377734 JB |
5171 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
5172 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
5173 | last_ptr = &root->fs_info->data_alloc_cluster; |
5174 | } | |
0f9dd46c | 5175 | |
239b14b3 | 5176 | if (last_ptr) { |
fa9c0d79 CM |
5177 | spin_lock(&last_ptr->lock); |
5178 | if (last_ptr->block_group) | |
5179 | hint_byte = last_ptr->window_start; | |
5180 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 5181 | } |
fa9c0d79 | 5182 | |
a061fc8d | 5183 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 5184 | search_start = max(search_start, hint_byte); |
0b86a832 | 5185 | |
817d52f8 | 5186 | if (!last_ptr) |
fa9c0d79 | 5187 | empty_cluster = 0; |
fa9c0d79 | 5188 | |
2552d17e | 5189 | if (search_start == hint_byte) { |
ccf0e725 | 5190 | ideal_cache: |
2552d17e JB |
5191 | block_group = btrfs_lookup_block_group(root->fs_info, |
5192 | search_start); | |
274bd4fb | 5193 | used_block_group = block_group; |
817d52f8 JB |
5194 | /* |
5195 | * we don't want to use the block group if it doesn't match our | |
5196 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
5197 | * |
5198 | * However if we are re-searching with an ideal block group | |
5199 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
5200 | */ |
5201 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
5202 | (block_group->cached != BTRFS_CACHE_NO || |
5203 | search_start == ideal_cache_offset)) { | |
2552d17e | 5204 | down_read(&space_info->groups_sem); |
44fb5511 CM |
5205 | if (list_empty(&block_group->list) || |
5206 | block_group->ro) { | |
5207 | /* | |
5208 | * someone is removing this block group, | |
5209 | * we can't jump into the have_block_group | |
5210 | * target because our list pointers are not | |
5211 | * valid | |
5212 | */ | |
5213 | btrfs_put_block_group(block_group); | |
5214 | up_read(&space_info->groups_sem); | |
ccf0e725 | 5215 | } else { |
b742bb82 | 5216 | index = get_block_group_index(block_group); |
44fb5511 | 5217 | goto have_block_group; |
ccf0e725 | 5218 | } |
2552d17e | 5219 | } else if (block_group) { |
fa9c0d79 | 5220 | btrfs_put_block_group(block_group); |
2552d17e | 5221 | } |
42e70e7a | 5222 | } |
2552d17e | 5223 | search: |
60d2adbb | 5224 | have_caching_bg = false; |
80eb234a | 5225 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
5226 | list_for_each_entry(block_group, &space_info->block_groups[index], |
5227 | list) { | |
6226cb0a | 5228 | u64 offset; |
817d52f8 | 5229 | int cached; |
8a1413a2 | 5230 | |
274bd4fb | 5231 | used_block_group = block_group; |
11dfe35a | 5232 | btrfs_get_block_group(block_group); |
2552d17e | 5233 | search_start = block_group->key.objectid; |
42e70e7a | 5234 | |
83a50de9 CM |
5235 | /* |
5236 | * this can happen if we end up cycling through all the | |
5237 | * raid types, but we want to make sure we only allocate | |
5238 | * for the proper type. | |
5239 | */ | |
5240 | if (!block_group_bits(block_group, data)) { | |
5241 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
5242 | BTRFS_BLOCK_GROUP_RAID1 | | |
5243 | BTRFS_BLOCK_GROUP_RAID10; | |
5244 | ||
5245 | /* | |
5246 | * if they asked for extra copies and this block group | |
5247 | * doesn't provide them, bail. This does allow us to | |
5248 | * fill raid0 from raid1. | |
5249 | */ | |
5250 | if ((data & extra) && !(block_group->flags & extra)) | |
5251 | goto loop; | |
5252 | } | |
5253 | ||
2552d17e | 5254 | have_block_group: |
291c7d2f JB |
5255 | cached = block_group_cache_done(block_group); |
5256 | if (unlikely(!cached)) { | |
ccf0e725 JB |
5257 | u64 free_percent; |
5258 | ||
291c7d2f | 5259 | found_uncached_bg = true; |
b8399dee JB |
5260 | ret = cache_block_group(block_group, trans, |
5261 | orig_root, 1); | |
9d66e233 | 5262 | if (block_group->cached == BTRFS_CACHE_FINISHED) |
291c7d2f | 5263 | goto alloc; |
9d66e233 | 5264 | |
ccf0e725 JB |
5265 | free_percent = btrfs_block_group_used(&block_group->item); |
5266 | free_percent *= 100; | |
5267 | free_percent = div64_u64(free_percent, | |
5268 | block_group->key.offset); | |
5269 | free_percent = 100 - free_percent; | |
5270 | if (free_percent > ideal_cache_percent && | |
5271 | likely(!block_group->ro)) { | |
5272 | ideal_cache_offset = block_group->key.objectid; | |
5273 | ideal_cache_percent = free_percent; | |
5274 | } | |
5275 | ||
817d52f8 | 5276 | /* |
bab39bf9 JB |
5277 | * The caching workers are limited to 2 threads, so we |
5278 | * can queue as much work as we care to. | |
817d52f8 | 5279 | */ |
bab39bf9 | 5280 | if (loop > LOOP_FIND_IDEAL) { |
b8399dee JB |
5281 | ret = cache_block_group(block_group, trans, |
5282 | orig_root, 0); | |
817d52f8 | 5283 | BUG_ON(ret); |
2552d17e | 5284 | } |
817d52f8 | 5285 | |
ccf0e725 JB |
5286 | /* |
5287 | * If loop is set for cached only, try the next block | |
5288 | * group. | |
5289 | */ | |
5290 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
5291 | goto loop; |
5292 | } | |
5293 | ||
291c7d2f | 5294 | alloc: |
ea6a478e | 5295 | if (unlikely(block_group->ro)) |
2552d17e | 5296 | goto loop; |
0f9dd46c | 5297 | |
ff5714cc | 5298 | spin_lock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5299 | if (cached && |
ff5714cc | 5300 | block_group->free_space_ctl->free_space < |
425d8315 | 5301 | num_bytes + empty_cluster + empty_size) { |
ff5714cc | 5302 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
cca1c81f JB |
5303 | goto loop; |
5304 | } | |
ff5714cc | 5305 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5306 | |
0a24325e | 5307 | /* |
062c05c4 AO |
5308 | * Ok we want to try and use the cluster allocator, so |
5309 | * lets look there | |
0a24325e | 5310 | */ |
062c05c4 | 5311 | if (last_ptr) { |
fa9c0d79 CM |
5312 | /* |
5313 | * the refill lock keeps out other | |
5314 | * people trying to start a new cluster | |
5315 | */ | |
5316 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
5317 | used_block_group = last_ptr->block_group; |
5318 | if (used_block_group != block_group && | |
5319 | (!used_block_group || | |
5320 | used_block_group->ro || | |
5321 | !block_group_bits(used_block_group, data))) { | |
5322 | used_block_group = block_group; | |
44fb5511 | 5323 | goto refill_cluster; |
274bd4fb AO |
5324 | } |
5325 | ||
5326 | if (used_block_group != block_group) | |
5327 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 5328 | |
274bd4fb AO |
5329 | offset = btrfs_alloc_from_cluster(used_block_group, |
5330 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
5331 | if (offset) { |
5332 | /* we have a block, we're done */ | |
5333 | spin_unlock(&last_ptr->refill_lock); | |
5334 | goto checks; | |
5335 | } | |
5336 | ||
274bd4fb AO |
5337 | WARN_ON(last_ptr->block_group != used_block_group); |
5338 | if (used_block_group != block_group) { | |
5339 | btrfs_put_block_group(used_block_group); | |
5340 | used_block_group = block_group; | |
fa9c0d79 | 5341 | } |
44fb5511 | 5342 | refill_cluster: |
274bd4fb | 5343 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
5344 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
5345 | * set up a new clusters, so lets just skip it | |
5346 | * and let the allocator find whatever block | |
5347 | * it can find. If we reach this point, we | |
5348 | * will have tried the cluster allocator | |
5349 | * plenty of times and not have found | |
5350 | * anything, so we are likely way too | |
5351 | * fragmented for the clustering stuff to find | |
5352 | * anything. */ | |
5353 | if (loop >= LOOP_NO_EMPTY_SIZE) { | |
5354 | spin_unlock(&last_ptr->refill_lock); | |
5355 | goto unclustered_alloc; | |
5356 | } | |
5357 | ||
fa9c0d79 CM |
5358 | /* |
5359 | * this cluster didn't work out, free it and | |
5360 | * start over | |
5361 | */ | |
5362 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5363 | ||
fa9c0d79 | 5364 | /* allocate a cluster in this block group */ |
451d7585 | 5365 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 5366 | block_group, last_ptr, |
1b22bad7 | 5367 | search_start, num_bytes, |
fa9c0d79 CM |
5368 | empty_cluster + empty_size); |
5369 | if (ret == 0) { | |
5370 | /* | |
5371 | * now pull our allocation out of this | |
5372 | * cluster | |
5373 | */ | |
5374 | offset = btrfs_alloc_from_cluster(block_group, | |
5375 | last_ptr, num_bytes, | |
5376 | search_start); | |
5377 | if (offset) { | |
5378 | /* we found one, proceed */ | |
5379 | spin_unlock(&last_ptr->refill_lock); | |
5380 | goto checks; | |
5381 | } | |
0a24325e JB |
5382 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5383 | && !failed_cluster_refill) { | |
817d52f8 JB |
5384 | spin_unlock(&last_ptr->refill_lock); |
5385 | ||
0a24325e | 5386 | failed_cluster_refill = true; |
817d52f8 JB |
5387 | wait_block_group_cache_progress(block_group, |
5388 | num_bytes + empty_cluster + empty_size); | |
5389 | goto have_block_group; | |
fa9c0d79 | 5390 | } |
817d52f8 | 5391 | |
fa9c0d79 CM |
5392 | /* |
5393 | * at this point we either didn't find a cluster | |
5394 | * or we weren't able to allocate a block from our | |
5395 | * cluster. Free the cluster we've been trying | |
5396 | * to use, and go to the next block group | |
5397 | */ | |
0a24325e | 5398 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5399 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5400 | goto loop; |
fa9c0d79 CM |
5401 | } |
5402 | ||
062c05c4 | 5403 | unclustered_alloc: |
6226cb0a JB |
5404 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5405 | num_bytes, empty_size); | |
1cdda9b8 JB |
5406 | /* |
5407 | * If we didn't find a chunk, and we haven't failed on this | |
5408 | * block group before, and this block group is in the middle of | |
5409 | * caching and we are ok with waiting, then go ahead and wait | |
5410 | * for progress to be made, and set failed_alloc to true. | |
5411 | * | |
5412 | * If failed_alloc is true then we've already waited on this | |
5413 | * block group once and should move on to the next block group. | |
5414 | */ | |
5415 | if (!offset && !failed_alloc && !cached && | |
5416 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5417 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5418 | num_bytes + empty_size); |
5419 | failed_alloc = true; | |
817d52f8 | 5420 | goto have_block_group; |
1cdda9b8 | 5421 | } else if (!offset) { |
60d2adbb MX |
5422 | if (!cached) |
5423 | have_caching_bg = true; | |
1cdda9b8 | 5424 | goto loop; |
817d52f8 | 5425 | } |
fa9c0d79 | 5426 | checks: |
6226cb0a | 5427 | search_start = stripe_align(root, offset); |
2552d17e | 5428 | /* move on to the next group */ |
6226cb0a | 5429 | if (search_start + num_bytes >= search_end) { |
274bd4fb | 5430 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 5431 | goto loop; |
6226cb0a | 5432 | } |
25179201 | 5433 | |
2552d17e JB |
5434 | /* move on to the next group */ |
5435 | if (search_start + num_bytes > | |
274bd4fb AO |
5436 | used_block_group->key.objectid + used_block_group->key.offset) { |
5437 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 5438 | goto loop; |
6226cb0a | 5439 | } |
f5a31e16 | 5440 | |
f0486c68 YZ |
5441 | ins->objectid = search_start; |
5442 | ins->offset = num_bytes; | |
2552d17e | 5443 | |
f0486c68 | 5444 | if (offset < search_start) |
274bd4fb | 5445 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
5446 | search_start - offset); |
5447 | BUG_ON(offset > search_start); | |
2552d17e | 5448 | |
274bd4fb | 5449 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 5450 | alloc_type); |
f0486c68 | 5451 | if (ret == -EAGAIN) { |
274bd4fb | 5452 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 5453 | goto loop; |
0f9dd46c | 5454 | } |
0b86a832 | 5455 | |
f0486c68 | 5456 | /* we are all good, lets return */ |
2552d17e JB |
5457 | ins->objectid = search_start; |
5458 | ins->offset = num_bytes; | |
d2fb3437 | 5459 | |
6226cb0a | 5460 | if (offset < search_start) |
274bd4fb | 5461 | btrfs_add_free_space(used_block_group, offset, |
6226cb0a JB |
5462 | search_start - offset); |
5463 | BUG_ON(offset > search_start); | |
274bd4fb AO |
5464 | if (used_block_group != block_group) |
5465 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 5466 | btrfs_put_block_group(block_group); |
2552d17e JB |
5467 | break; |
5468 | loop: | |
0a24325e | 5469 | failed_cluster_refill = false; |
1cdda9b8 | 5470 | failed_alloc = false; |
b742bb82 | 5471 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
5472 | if (used_block_group != block_group) |
5473 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 5474 | btrfs_put_block_group(block_group); |
2552d17e JB |
5475 | } |
5476 | up_read(&space_info->groups_sem); | |
5477 | ||
60d2adbb MX |
5478 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
5479 | goto search; | |
5480 | ||
b742bb82 YZ |
5481 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5482 | goto search; | |
5483 | ||
ccf0e725 JB |
5484 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
5485 | * for them to make caching progress. Also | |
5486 | * determine the best possible bg to cache | |
5487 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
5488 | * caching kthreads as we move along | |
817d52f8 JB |
5489 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5490 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5491 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5492 | * again | |
fa9c0d79 | 5493 | */ |
723bda20 | 5494 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 5495 | index = 0; |
ccf0e725 | 5496 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 5497 | found_uncached_bg = false; |
ccf0e725 | 5498 | loop++; |
bab39bf9 | 5499 | if (!ideal_cache_percent) |
817d52f8 | 5500 | goto search; |
ccf0e725 JB |
5501 | |
5502 | /* | |
5503 | * 1 of the following 2 things have happened so far | |
5504 | * | |
5505 | * 1) We found an ideal block group for caching that | |
5506 | * is mostly full and will cache quickly, so we might | |
5507 | * as well wait for it. | |
5508 | * | |
5509 | * 2) We searched for cached only and we didn't find | |
5510 | * anything, and we didn't start any caching kthreads | |
5511 | * either, so chances are we will loop through and | |
5512 | * start a couple caching kthreads, and then come back | |
5513 | * around and just wait for them. This will be slower | |
5514 | * because we will have 2 caching kthreads reading at | |
5515 | * the same time when we could have just started one | |
5516 | * and waited for it to get far enough to give us an | |
5517 | * allocation, so go ahead and go to the wait caching | |
5518 | * loop. | |
5519 | */ | |
5520 | loop = LOOP_CACHING_WAIT; | |
5521 | search_start = ideal_cache_offset; | |
5522 | ideal_cache_percent = 0; | |
5523 | goto ideal_cache; | |
5524 | } else if (loop == LOOP_FIND_IDEAL) { | |
5525 | /* | |
5526 | * Didn't find a uncached bg, wait on anything we find | |
5527 | * next. | |
5528 | */ | |
5529 | loop = LOOP_CACHING_WAIT; | |
5530 | goto search; | |
5531 | } | |
5532 | ||
723bda20 | 5533 | loop++; |
817d52f8 JB |
5534 | |
5535 | if (loop == LOOP_ALLOC_CHUNK) { | |
723bda20 JB |
5536 | if (allowed_chunk_alloc) { |
5537 | ret = do_chunk_alloc(trans, root, num_bytes + | |
5538 | 2 * 1024 * 1024, data, | |
5539 | CHUNK_ALLOC_LIMITED); | |
5540 | allowed_chunk_alloc = 0; | |
5541 | if (ret == 1) | |
5542 | done_chunk_alloc = 1; | |
5543 | } else if (!done_chunk_alloc && | |
5544 | space_info->force_alloc == | |
5545 | CHUNK_ALLOC_NO_FORCE) { | |
5546 | space_info->force_alloc = CHUNK_ALLOC_LIMITED; | |
5547 | } | |
2552d17e | 5548 | |
723bda20 JB |
5549 | /* |
5550 | * We didn't allocate a chunk, go ahead and drop the | |
5551 | * empty size and loop again. | |
5552 | */ | |
5553 | if (!done_chunk_alloc) | |
5554 | loop = LOOP_NO_EMPTY_SIZE; | |
2552d17e JB |
5555 | } |
5556 | ||
723bda20 JB |
5557 | if (loop == LOOP_NO_EMPTY_SIZE) { |
5558 | empty_size = 0; | |
5559 | empty_cluster = 0; | |
fa9c0d79 | 5560 | } |
723bda20 JB |
5561 | |
5562 | goto search; | |
2552d17e JB |
5563 | } else if (!ins->objectid) { |
5564 | ret = -ENOSPC; | |
d82a6f1d | 5565 | } else if (ins->objectid) { |
80eb234a | 5566 | ret = 0; |
be744175 | 5567 | } |
be744175 | 5568 | |
0f70abe2 | 5569 | return ret; |
fec577fb | 5570 | } |
ec44a35c | 5571 | |
9ed74f2d JB |
5572 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
5573 | int dump_block_groups) | |
0f9dd46c JB |
5574 | { |
5575 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 5576 | int index = 0; |
0f9dd46c | 5577 | |
9ed74f2d | 5578 | spin_lock(&info->lock); |
fb25e914 JB |
5579 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
5580 | (unsigned long long)info->flags, | |
d397712b | 5581 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 5582 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 5583 | info->bytes_readonly), |
d397712b | 5584 | (info->full) ? "" : "not "); |
8929ecfa YZ |
5585 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
5586 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 5587 | (unsigned long long)info->total_bytes, |
8929ecfa | 5588 | (unsigned long long)info->bytes_used, |
21380931 | 5589 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 5590 | (unsigned long long)info->bytes_reserved, |
21380931 | 5591 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 5592 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
5593 | spin_unlock(&info->lock); |
5594 | ||
5595 | if (!dump_block_groups) | |
5596 | return; | |
0f9dd46c | 5597 | |
80eb234a | 5598 | down_read(&info->groups_sem); |
b742bb82 YZ |
5599 | again: |
5600 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 5601 | spin_lock(&cache->lock); |
d397712b CM |
5602 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
5603 | "%llu pinned %llu reserved\n", | |
5604 | (unsigned long long)cache->key.objectid, | |
5605 | (unsigned long long)cache->key.offset, | |
5606 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
5607 | (unsigned long long)cache->pinned, | |
5608 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
5609 | btrfs_dump_free_space(cache, bytes); |
5610 | spin_unlock(&cache->lock); | |
5611 | } | |
b742bb82 YZ |
5612 | if (++index < BTRFS_NR_RAID_TYPES) |
5613 | goto again; | |
80eb234a | 5614 | up_read(&info->groups_sem); |
0f9dd46c | 5615 | } |
e8569813 | 5616 | |
11833d66 YZ |
5617 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
5618 | struct btrfs_root *root, | |
5619 | u64 num_bytes, u64 min_alloc_size, | |
5620 | u64 empty_size, u64 hint_byte, | |
5621 | u64 search_end, struct btrfs_key *ins, | |
5622 | u64 data) | |
fec577fb CM |
5623 | { |
5624 | int ret; | |
fbdc762b | 5625 | u64 search_start = 0; |
925baedd | 5626 | |
6a63209f | 5627 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 5628 | again: |
0ef3e66b CM |
5629 | /* |
5630 | * the only place that sets empty_size is btrfs_realloc_node, which | |
5631 | * is not called recursively on allocations | |
5632 | */ | |
83d3c969 | 5633 | if (empty_size || root->ref_cows) |
6324fbf3 | 5634 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
5635 | num_bytes + 2 * 1024 * 1024, data, |
5636 | CHUNK_ALLOC_NO_FORCE); | |
0b86a832 | 5637 | |
db94535d CM |
5638 | WARN_ON(num_bytes < root->sectorsize); |
5639 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
5640 | search_start, search_end, hint_byte, |
5641 | ins, data); | |
3b951516 | 5642 | |
98d20f67 CM |
5643 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
5644 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 5645 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 5646 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b | 5647 | do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 | 5648 | num_bytes, data, CHUNK_ALLOC_FORCE); |
98d20f67 CM |
5649 | goto again; |
5650 | } | |
91435650 | 5651 | if (ret == -ENOSPC && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
0f9dd46c JB |
5652 | struct btrfs_space_info *sinfo; |
5653 | ||
5654 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5655 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5656 | "wanted %llu\n", (unsigned long long)data, | |
5657 | (unsigned long long)num_bytes); | |
9ed74f2d | 5658 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5659 | } |
0f9dd46c | 5660 | |
1abe9b8a | 5661 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
5662 | ||
0f9dd46c | 5663 | return ret; |
e6dcd2dc CM |
5664 | } |
5665 | ||
e688b725 CM |
5666 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
5667 | u64 start, u64 len, int pin) | |
65b51a00 | 5668 | { |
0f9dd46c | 5669 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5670 | int ret = 0; |
0f9dd46c | 5671 | |
0f9dd46c JB |
5672 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5673 | if (!cache) { | |
d397712b CM |
5674 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5675 | (unsigned long long)start); | |
0f9dd46c JB |
5676 | return -ENOSPC; |
5677 | } | |
1f3c79a2 | 5678 | |
5378e607 LD |
5679 | if (btrfs_test_opt(root, DISCARD)) |
5680 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 5681 | |
e688b725 CM |
5682 | if (pin) |
5683 | pin_down_extent(root, cache, start, len, 1); | |
5684 | else { | |
5685 | btrfs_add_free_space(cache, start, len); | |
5686 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
5687 | } | |
fa9c0d79 | 5688 | btrfs_put_block_group(cache); |
817d52f8 | 5689 | |
1abe9b8a | 5690 | trace_btrfs_reserved_extent_free(root, start, len); |
5691 | ||
e6dcd2dc CM |
5692 | return ret; |
5693 | } | |
5694 | ||
e688b725 CM |
5695 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
5696 | u64 start, u64 len) | |
5697 | { | |
5698 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
5699 | } | |
5700 | ||
5701 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
5702 | u64 start, u64 len) | |
5703 | { | |
5704 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
5705 | } | |
5706 | ||
5d4f98a2 YZ |
5707 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5708 | struct btrfs_root *root, | |
5709 | u64 parent, u64 root_objectid, | |
5710 | u64 flags, u64 owner, u64 offset, | |
5711 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5712 | { |
5713 | int ret; | |
5d4f98a2 | 5714 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5715 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5716 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5717 | struct btrfs_path *path; |
5d4f98a2 YZ |
5718 | struct extent_buffer *leaf; |
5719 | int type; | |
5720 | u32 size; | |
26b8003f | 5721 | |
5d4f98a2 YZ |
5722 | if (parent > 0) |
5723 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5724 | else | |
5725 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5726 | |
5d4f98a2 | 5727 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5728 | |
5729 | path = btrfs_alloc_path(); | |
db5b493a TI |
5730 | if (!path) |
5731 | return -ENOMEM; | |
47e4bb98 | 5732 | |
b9473439 | 5733 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5734 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5735 | ins, size); | |
ccd467d6 | 5736 | BUG_ON(ret); |
0f9dd46c | 5737 | |
5d4f98a2 YZ |
5738 | leaf = path->nodes[0]; |
5739 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5740 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5741 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5742 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5743 | btrfs_set_extent_flags(leaf, extent_item, | |
5744 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5745 | ||
5746 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5747 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5748 | if (parent > 0) { | |
5749 | struct btrfs_shared_data_ref *ref; | |
5750 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5751 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5752 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5753 | } else { | |
5754 | struct btrfs_extent_data_ref *ref; | |
5755 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5756 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5757 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5758 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5759 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5760 | } | |
47e4bb98 CM |
5761 | |
5762 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5763 | btrfs_free_path(path); |
f510cfec | 5764 | |
f0486c68 | 5765 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5766 | if (ret) { |
d397712b CM |
5767 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5768 | "%llu\n", (unsigned long long)ins->objectid, | |
5769 | (unsigned long long)ins->offset); | |
f5947066 CM |
5770 | BUG(); |
5771 | } | |
e6dcd2dc CM |
5772 | return ret; |
5773 | } | |
5774 | ||
5d4f98a2 YZ |
5775 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5776 | struct btrfs_root *root, | |
5777 | u64 parent, u64 root_objectid, | |
5778 | u64 flags, struct btrfs_disk_key *key, | |
5779 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5780 | { |
5781 | int ret; | |
5d4f98a2 YZ |
5782 | struct btrfs_fs_info *fs_info = root->fs_info; |
5783 | struct btrfs_extent_item *extent_item; | |
5784 | struct btrfs_tree_block_info *block_info; | |
5785 | struct btrfs_extent_inline_ref *iref; | |
5786 | struct btrfs_path *path; | |
5787 | struct extent_buffer *leaf; | |
5788 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5789 | |
5d4f98a2 | 5790 | path = btrfs_alloc_path(); |
d8926bb3 MF |
5791 | if (!path) |
5792 | return -ENOMEM; | |
56bec294 | 5793 | |
5d4f98a2 YZ |
5794 | path->leave_spinning = 1; |
5795 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5796 | ins, size); | |
56bec294 | 5797 | BUG_ON(ret); |
5d4f98a2 YZ |
5798 | |
5799 | leaf = path->nodes[0]; | |
5800 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5801 | struct btrfs_extent_item); | |
5802 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5803 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5804 | btrfs_set_extent_flags(leaf, extent_item, | |
5805 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5806 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5807 | ||
5808 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5809 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5810 | ||
5811 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5812 | if (parent > 0) { | |
5813 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5814 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5815 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5816 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5817 | } else { | |
5818 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5819 | BTRFS_TREE_BLOCK_REF_KEY); | |
5820 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5821 | } | |
5822 | ||
5823 | btrfs_mark_buffer_dirty(leaf); | |
5824 | btrfs_free_path(path); | |
5825 | ||
f0486c68 | 5826 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5827 | if (ret) { |
5828 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5829 | "%llu\n", (unsigned long long)ins->objectid, | |
5830 | (unsigned long long)ins->offset); | |
5831 | BUG(); | |
5832 | } | |
5833 | return ret; | |
5834 | } | |
5835 | ||
5836 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5837 | struct btrfs_root *root, | |
5838 | u64 root_objectid, u64 owner, | |
5839 | u64 offset, struct btrfs_key *ins) | |
5840 | { | |
5841 | int ret; | |
5842 | ||
5843 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5844 | ||
5845 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5846 | 0, root_objectid, owner, offset, | |
5847 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5848 | return ret; |
5849 | } | |
e02119d5 CM |
5850 | |
5851 | /* | |
5852 | * this is used by the tree logging recovery code. It records that | |
5853 | * an extent has been allocated and makes sure to clear the free | |
5854 | * space cache bits as well | |
5855 | */ | |
5d4f98a2 YZ |
5856 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5857 | struct btrfs_root *root, | |
5858 | u64 root_objectid, u64 owner, u64 offset, | |
5859 | struct btrfs_key *ins) | |
e02119d5 CM |
5860 | { |
5861 | int ret; | |
5862 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5863 | struct btrfs_caching_control *caching_ctl; |
5864 | u64 start = ins->objectid; | |
5865 | u64 num_bytes = ins->offset; | |
e02119d5 | 5866 | |
e02119d5 | 5867 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
b8399dee | 5868 | cache_block_group(block_group, trans, NULL, 0); |
11833d66 | 5869 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5870 | |
11833d66 YZ |
5871 | if (!caching_ctl) { |
5872 | BUG_ON(!block_group_cache_done(block_group)); | |
5873 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5874 | BUG_ON(ret); | |
5875 | } else { | |
5876 | mutex_lock(&caching_ctl->mutex); | |
5877 | ||
5878 | if (start >= caching_ctl->progress) { | |
5879 | ret = add_excluded_extent(root, start, num_bytes); | |
5880 | BUG_ON(ret); | |
5881 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5882 | ret = btrfs_remove_free_space(block_group, | |
5883 | start, num_bytes); | |
5884 | BUG_ON(ret); | |
5885 | } else { | |
5886 | num_bytes = caching_ctl->progress - start; | |
5887 | ret = btrfs_remove_free_space(block_group, | |
5888 | start, num_bytes); | |
5889 | BUG_ON(ret); | |
5890 | ||
5891 | start = caching_ctl->progress; | |
5892 | num_bytes = ins->objectid + ins->offset - | |
5893 | caching_ctl->progress; | |
5894 | ret = add_excluded_extent(root, start, num_bytes); | |
5895 | BUG_ON(ret); | |
5896 | } | |
5897 | ||
5898 | mutex_unlock(&caching_ctl->mutex); | |
5899 | put_caching_control(caching_ctl); | |
5900 | } | |
5901 | ||
fb25e914 JB |
5902 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
5903 | RESERVE_ALLOC_NO_ACCOUNT); | |
f0486c68 | 5904 | BUG_ON(ret); |
fa9c0d79 | 5905 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5906 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5907 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5908 | return ret; |
5909 | } | |
5910 | ||
65b51a00 CM |
5911 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5912 | struct btrfs_root *root, | |
4008c04a CM |
5913 | u64 bytenr, u32 blocksize, |
5914 | int level) | |
65b51a00 CM |
5915 | { |
5916 | struct extent_buffer *buf; | |
5917 | ||
5918 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5919 | if (!buf) | |
5920 | return ERR_PTR(-ENOMEM); | |
5921 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 5922 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
5923 | btrfs_tree_lock(buf); |
5924 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5925 | |
5926 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5927 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5928 | |
d0c803c4 | 5929 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5930 | /* |
5931 | * we allow two log transactions at a time, use different | |
5932 | * EXENT bit to differentiate dirty pages. | |
5933 | */ | |
5934 | if (root->log_transid % 2 == 0) | |
5935 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5936 | buf->start + buf->len - 1, GFP_NOFS); | |
5937 | else | |
5938 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5939 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5940 | } else { |
5941 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5942 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5943 | } |
65b51a00 | 5944 | trans->blocks_used++; |
b4ce94de | 5945 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5946 | return buf; |
5947 | } | |
5948 | ||
f0486c68 YZ |
5949 | static struct btrfs_block_rsv * |
5950 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5951 | struct btrfs_root *root, u32 blocksize) | |
5952 | { | |
5953 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 5954 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
5955 | int ret; |
5956 | ||
5957 | block_rsv = get_block_rsv(trans, root); | |
5958 | ||
5959 | if (block_rsv->size == 0) { | |
36ba022a | 5960 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0); |
68a82277 JB |
5961 | /* |
5962 | * If we couldn't reserve metadata bytes try and use some from | |
5963 | * the global reserve. | |
5964 | */ | |
5965 | if (ret && block_rsv != global_rsv) { | |
5966 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5967 | if (!ret) | |
5968 | return global_rsv; | |
f0486c68 | 5969 | return ERR_PTR(ret); |
68a82277 | 5970 | } else if (ret) { |
f0486c68 | 5971 | return ERR_PTR(ret); |
68a82277 | 5972 | } |
f0486c68 YZ |
5973 | return block_rsv; |
5974 | } | |
5975 | ||
5976 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5977 | if (!ret) | |
5978 | return block_rsv; | |
68a82277 | 5979 | if (ret) { |
dff51cd1 DS |
5980 | static DEFINE_RATELIMIT_STATE(_rs, |
5981 | DEFAULT_RATELIMIT_INTERVAL, | |
5982 | /*DEFAULT_RATELIMIT_BURST*/ 2); | |
5983 | if (__ratelimit(&_rs)) { | |
5984 | printk(KERN_DEBUG "btrfs: block rsv returned %d\n", ret); | |
5985 | WARN_ON(1); | |
5986 | } | |
36ba022a | 5987 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0); |
68a82277 | 5988 | if (!ret) { |
68a82277 JB |
5989 | return block_rsv; |
5990 | } else if (ret && block_rsv != global_rsv) { | |
5991 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5992 | if (!ret) | |
5993 | return global_rsv; | |
5994 | } | |
5995 | } | |
f0486c68 | 5996 | |
f0486c68 YZ |
5997 | return ERR_PTR(-ENOSPC); |
5998 | } | |
5999 | ||
6000 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
6001 | { | |
6002 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
6003 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
6004 | } | |
6005 | ||
fec577fb | 6006 | /* |
f0486c68 YZ |
6007 | * finds a free extent and does all the dirty work required for allocation |
6008 | * returns the key for the extent through ins, and a tree buffer for | |
6009 | * the first block of the extent through buf. | |
6010 | * | |
fec577fb CM |
6011 | * returns the tree buffer or NULL. |
6012 | */ | |
5f39d397 | 6013 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6014 | struct btrfs_root *root, u32 blocksize, |
6015 | u64 parent, u64 root_objectid, | |
6016 | struct btrfs_disk_key *key, int level, | |
6017 | u64 hint, u64 empty_size) | |
fec577fb | 6018 | { |
e2fa7227 | 6019 | struct btrfs_key ins; |
f0486c68 | 6020 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6021 | struct extent_buffer *buf; |
f0486c68 YZ |
6022 | u64 flags = 0; |
6023 | int ret; | |
6024 | ||
fec577fb | 6025 | |
f0486c68 YZ |
6026 | block_rsv = use_block_rsv(trans, root, blocksize); |
6027 | if (IS_ERR(block_rsv)) | |
6028 | return ERR_CAST(block_rsv); | |
6029 | ||
6030 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
6031 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 6032 | if (ret) { |
f0486c68 | 6033 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 6034 | return ERR_PTR(ret); |
fec577fb | 6035 | } |
55c69072 | 6036 | |
4008c04a CM |
6037 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6038 | blocksize, level); | |
f0486c68 YZ |
6039 | BUG_ON(IS_ERR(buf)); |
6040 | ||
6041 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6042 | if (parent == 0) | |
6043 | parent = ins.objectid; | |
6044 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6045 | } else | |
6046 | BUG_ON(parent > 0); | |
6047 | ||
6048 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6049 | struct btrfs_delayed_extent_op *extent_op; | |
6050 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
6051 | BUG_ON(!extent_op); | |
6052 | if (key) | |
6053 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6054 | else | |
6055 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6056 | extent_op->flags_to_set = flags; | |
6057 | extent_op->update_key = 1; | |
6058 | extent_op->update_flags = 1; | |
6059 | extent_op->is_data = 0; | |
6060 | ||
6061 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
6062 | ins.offset, parent, root_objectid, | |
6063 | level, BTRFS_ADD_DELAYED_EXTENT, | |
6064 | extent_op); | |
6065 | BUG_ON(ret); | |
6066 | } | |
fec577fb CM |
6067 | return buf; |
6068 | } | |
a28ec197 | 6069 | |
2c47e605 YZ |
6070 | struct walk_control { |
6071 | u64 refs[BTRFS_MAX_LEVEL]; | |
6072 | u64 flags[BTRFS_MAX_LEVEL]; | |
6073 | struct btrfs_key update_progress; | |
6074 | int stage; | |
6075 | int level; | |
6076 | int shared_level; | |
6077 | int update_ref; | |
6078 | int keep_locks; | |
1c4850e2 YZ |
6079 | int reada_slot; |
6080 | int reada_count; | |
2c47e605 YZ |
6081 | }; |
6082 | ||
6083 | #define DROP_REFERENCE 1 | |
6084 | #define UPDATE_BACKREF 2 | |
6085 | ||
1c4850e2 YZ |
6086 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
6087 | struct btrfs_root *root, | |
6088 | struct walk_control *wc, | |
6089 | struct btrfs_path *path) | |
6407bf6d | 6090 | { |
1c4850e2 YZ |
6091 | u64 bytenr; |
6092 | u64 generation; | |
6093 | u64 refs; | |
94fcca9f | 6094 | u64 flags; |
5d4f98a2 | 6095 | u32 nritems; |
1c4850e2 YZ |
6096 | u32 blocksize; |
6097 | struct btrfs_key key; | |
6098 | struct extent_buffer *eb; | |
6407bf6d | 6099 | int ret; |
1c4850e2 YZ |
6100 | int slot; |
6101 | int nread = 0; | |
6407bf6d | 6102 | |
1c4850e2 YZ |
6103 | if (path->slots[wc->level] < wc->reada_slot) { |
6104 | wc->reada_count = wc->reada_count * 2 / 3; | |
6105 | wc->reada_count = max(wc->reada_count, 2); | |
6106 | } else { | |
6107 | wc->reada_count = wc->reada_count * 3 / 2; | |
6108 | wc->reada_count = min_t(int, wc->reada_count, | |
6109 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
6110 | } | |
7bb86316 | 6111 | |
1c4850e2 YZ |
6112 | eb = path->nodes[wc->level]; |
6113 | nritems = btrfs_header_nritems(eb); | |
6114 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 6115 | |
1c4850e2 YZ |
6116 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
6117 | if (nread >= wc->reada_count) | |
6118 | break; | |
bd56b302 | 6119 | |
2dd3e67b | 6120 | cond_resched(); |
1c4850e2 YZ |
6121 | bytenr = btrfs_node_blockptr(eb, slot); |
6122 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 6123 | |
1c4850e2 YZ |
6124 | if (slot == path->slots[wc->level]) |
6125 | goto reada; | |
5d4f98a2 | 6126 | |
1c4850e2 YZ |
6127 | if (wc->stage == UPDATE_BACKREF && |
6128 | generation <= root->root_key.offset) | |
bd56b302 CM |
6129 | continue; |
6130 | ||
94fcca9f YZ |
6131 | /* We don't lock the tree block, it's OK to be racy here */ |
6132 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
6133 | &refs, &flags); | |
6134 | BUG_ON(ret); | |
6135 | BUG_ON(refs == 0); | |
6136 | ||
1c4850e2 | 6137 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
6138 | if (refs == 1) |
6139 | goto reada; | |
bd56b302 | 6140 | |
94fcca9f YZ |
6141 | if (wc->level == 1 && |
6142 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6143 | continue; | |
1c4850e2 YZ |
6144 | if (!wc->update_ref || |
6145 | generation <= root->root_key.offset) | |
6146 | continue; | |
6147 | btrfs_node_key_to_cpu(eb, &key, slot); | |
6148 | ret = btrfs_comp_cpu_keys(&key, | |
6149 | &wc->update_progress); | |
6150 | if (ret < 0) | |
6151 | continue; | |
94fcca9f YZ |
6152 | } else { |
6153 | if (wc->level == 1 && | |
6154 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6155 | continue; | |
6407bf6d | 6156 | } |
1c4850e2 YZ |
6157 | reada: |
6158 | ret = readahead_tree_block(root, bytenr, blocksize, | |
6159 | generation); | |
6160 | if (ret) | |
bd56b302 | 6161 | break; |
1c4850e2 | 6162 | nread++; |
20524f02 | 6163 | } |
1c4850e2 | 6164 | wc->reada_slot = slot; |
20524f02 | 6165 | } |
2c47e605 | 6166 | |
f82d02d9 | 6167 | /* |
2c47e605 YZ |
6168 | * hepler to process tree block while walking down the tree. |
6169 | * | |
2c47e605 YZ |
6170 | * when wc->stage == UPDATE_BACKREF, this function updates |
6171 | * back refs for pointers in the block. | |
6172 | * | |
6173 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 6174 | */ |
2c47e605 | 6175 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 6176 | struct btrfs_root *root, |
2c47e605 | 6177 | struct btrfs_path *path, |
94fcca9f | 6178 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 6179 | { |
2c47e605 YZ |
6180 | int level = wc->level; |
6181 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 6182 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
6183 | int ret; |
6184 | ||
2c47e605 YZ |
6185 | if (wc->stage == UPDATE_BACKREF && |
6186 | btrfs_header_owner(eb) != root->root_key.objectid) | |
6187 | return 1; | |
f82d02d9 | 6188 | |
2c47e605 YZ |
6189 | /* |
6190 | * when reference count of tree block is 1, it won't increase | |
6191 | * again. once full backref flag is set, we never clear it. | |
6192 | */ | |
94fcca9f YZ |
6193 | if (lookup_info && |
6194 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
6195 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
6196 | BUG_ON(!path->locks[level]); |
6197 | ret = btrfs_lookup_extent_info(trans, root, | |
6198 | eb->start, eb->len, | |
6199 | &wc->refs[level], | |
6200 | &wc->flags[level]); | |
6201 | BUG_ON(ret); | |
6202 | BUG_ON(wc->refs[level] == 0); | |
6203 | } | |
5d4f98a2 | 6204 | |
2c47e605 YZ |
6205 | if (wc->stage == DROP_REFERENCE) { |
6206 | if (wc->refs[level] > 1) | |
6207 | return 1; | |
f82d02d9 | 6208 | |
2c47e605 | 6209 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 6210 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6211 | path->locks[level] = 0; |
6212 | } | |
6213 | return 0; | |
6214 | } | |
f82d02d9 | 6215 | |
2c47e605 YZ |
6216 | /* wc->stage == UPDATE_BACKREF */ |
6217 | if (!(wc->flags[level] & flag)) { | |
6218 | BUG_ON(!path->locks[level]); | |
6219 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 6220 | BUG_ON(ret); |
2c47e605 YZ |
6221 | ret = btrfs_dec_ref(trans, root, eb, 0); |
6222 | BUG_ON(ret); | |
6223 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
6224 | eb->len, flag, 0); | |
6225 | BUG_ON(ret); | |
6226 | wc->flags[level] |= flag; | |
6227 | } | |
6228 | ||
6229 | /* | |
6230 | * the block is shared by multiple trees, so it's not good to | |
6231 | * keep the tree lock | |
6232 | */ | |
6233 | if (path->locks[level] && level > 0) { | |
bd681513 | 6234 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6235 | path->locks[level] = 0; |
6236 | } | |
6237 | return 0; | |
6238 | } | |
6239 | ||
1c4850e2 YZ |
6240 | /* |
6241 | * hepler to process tree block pointer. | |
6242 | * | |
6243 | * when wc->stage == DROP_REFERENCE, this function checks | |
6244 | * reference count of the block pointed to. if the block | |
6245 | * is shared and we need update back refs for the subtree | |
6246 | * rooted at the block, this function changes wc->stage to | |
6247 | * UPDATE_BACKREF. if the block is shared and there is no | |
6248 | * need to update back, this function drops the reference | |
6249 | * to the block. | |
6250 | * | |
6251 | * NOTE: return value 1 means we should stop walking down. | |
6252 | */ | |
6253 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
6254 | struct btrfs_root *root, | |
6255 | struct btrfs_path *path, | |
94fcca9f | 6256 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
6257 | { |
6258 | u64 bytenr; | |
6259 | u64 generation; | |
6260 | u64 parent; | |
6261 | u32 blocksize; | |
6262 | struct btrfs_key key; | |
6263 | struct extent_buffer *next; | |
6264 | int level = wc->level; | |
6265 | int reada = 0; | |
6266 | int ret = 0; | |
6267 | ||
6268 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
6269 | path->slots[level]); | |
6270 | /* | |
6271 | * if the lower level block was created before the snapshot | |
6272 | * was created, we know there is no need to update back refs | |
6273 | * for the subtree | |
6274 | */ | |
6275 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
6276 | generation <= root->root_key.offset) { |
6277 | *lookup_info = 1; | |
1c4850e2 | 6278 | return 1; |
94fcca9f | 6279 | } |
1c4850e2 YZ |
6280 | |
6281 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
6282 | blocksize = btrfs_level_size(root, level - 1); | |
6283 | ||
6284 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
6285 | if (!next) { | |
6286 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
6287 | if (!next) |
6288 | return -ENOMEM; | |
1c4850e2 YZ |
6289 | reada = 1; |
6290 | } | |
6291 | btrfs_tree_lock(next); | |
6292 | btrfs_set_lock_blocking(next); | |
6293 | ||
94fcca9f YZ |
6294 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
6295 | &wc->refs[level - 1], | |
6296 | &wc->flags[level - 1]); | |
6297 | BUG_ON(ret); | |
6298 | BUG_ON(wc->refs[level - 1] == 0); | |
6299 | *lookup_info = 0; | |
1c4850e2 | 6300 | |
94fcca9f | 6301 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 6302 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
6303 | if (level == 1 && |
6304 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6305 | goto skip; | |
6306 | ||
1c4850e2 YZ |
6307 | if (!wc->update_ref || |
6308 | generation <= root->root_key.offset) | |
6309 | goto skip; | |
6310 | ||
6311 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
6312 | path->slots[level]); | |
6313 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
6314 | if (ret < 0) | |
6315 | goto skip; | |
6316 | ||
6317 | wc->stage = UPDATE_BACKREF; | |
6318 | wc->shared_level = level - 1; | |
6319 | } | |
94fcca9f YZ |
6320 | } else { |
6321 | if (level == 1 && | |
6322 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6323 | goto skip; | |
1c4850e2 YZ |
6324 | } |
6325 | ||
6326 | if (!btrfs_buffer_uptodate(next, generation)) { | |
6327 | btrfs_tree_unlock(next); | |
6328 | free_extent_buffer(next); | |
6329 | next = NULL; | |
94fcca9f | 6330 | *lookup_info = 1; |
1c4850e2 YZ |
6331 | } |
6332 | ||
6333 | if (!next) { | |
6334 | if (reada && level == 1) | |
6335 | reada_walk_down(trans, root, wc, path); | |
6336 | next = read_tree_block(root, bytenr, blocksize, generation); | |
97d9a8a4 TI |
6337 | if (!next) |
6338 | return -EIO; | |
1c4850e2 YZ |
6339 | btrfs_tree_lock(next); |
6340 | btrfs_set_lock_blocking(next); | |
6341 | } | |
6342 | ||
6343 | level--; | |
6344 | BUG_ON(level != btrfs_header_level(next)); | |
6345 | path->nodes[level] = next; | |
6346 | path->slots[level] = 0; | |
bd681513 | 6347 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
6348 | wc->level = level; |
6349 | if (wc->level == 1) | |
6350 | wc->reada_slot = 0; | |
6351 | return 0; | |
6352 | skip: | |
6353 | wc->refs[level - 1] = 0; | |
6354 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6355 | if (wc->stage == DROP_REFERENCE) { |
6356 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6357 | parent = path->nodes[level]->start; | |
6358 | } else { | |
6359 | BUG_ON(root->root_key.objectid != | |
6360 | btrfs_header_owner(path->nodes[level])); | |
6361 | parent = 0; | |
6362 | } | |
1c4850e2 | 6363 | |
94fcca9f YZ |
6364 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
6365 | root->root_key.objectid, level - 1, 0); | |
6366 | BUG_ON(ret); | |
1c4850e2 | 6367 | } |
1c4850e2 YZ |
6368 | btrfs_tree_unlock(next); |
6369 | free_extent_buffer(next); | |
94fcca9f | 6370 | *lookup_info = 1; |
1c4850e2 YZ |
6371 | return 1; |
6372 | } | |
6373 | ||
2c47e605 YZ |
6374 | /* |
6375 | * hepler to process tree block while walking up the tree. | |
6376 | * | |
6377 | * when wc->stage == DROP_REFERENCE, this function drops | |
6378 | * reference count on the block. | |
6379 | * | |
6380 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6381 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6382 | * to UPDATE_BACKREF previously while processing the block. | |
6383 | * | |
6384 | * NOTE: return value 1 means we should stop walking up. | |
6385 | */ | |
6386 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6387 | struct btrfs_root *root, | |
6388 | struct btrfs_path *path, | |
6389 | struct walk_control *wc) | |
6390 | { | |
f0486c68 | 6391 | int ret; |
2c47e605 YZ |
6392 | int level = wc->level; |
6393 | struct extent_buffer *eb = path->nodes[level]; | |
6394 | u64 parent = 0; | |
6395 | ||
6396 | if (wc->stage == UPDATE_BACKREF) { | |
6397 | BUG_ON(wc->shared_level < level); | |
6398 | if (level < wc->shared_level) | |
6399 | goto out; | |
6400 | ||
2c47e605 YZ |
6401 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6402 | if (ret > 0) | |
6403 | wc->update_ref = 0; | |
6404 | ||
6405 | wc->stage = DROP_REFERENCE; | |
6406 | wc->shared_level = -1; | |
6407 | path->slots[level] = 0; | |
6408 | ||
6409 | /* | |
6410 | * check reference count again if the block isn't locked. | |
6411 | * we should start walking down the tree again if reference | |
6412 | * count is one. | |
6413 | */ | |
6414 | if (!path->locks[level]) { | |
6415 | BUG_ON(level == 0); | |
6416 | btrfs_tree_lock(eb); | |
6417 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6418 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6419 | |
6420 | ret = btrfs_lookup_extent_info(trans, root, | |
6421 | eb->start, eb->len, | |
6422 | &wc->refs[level], | |
6423 | &wc->flags[level]); | |
f82d02d9 | 6424 | BUG_ON(ret); |
2c47e605 YZ |
6425 | BUG_ON(wc->refs[level] == 0); |
6426 | if (wc->refs[level] == 1) { | |
bd681513 | 6427 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6428 | return 1; |
6429 | } | |
f82d02d9 | 6430 | } |
2c47e605 | 6431 | } |
f82d02d9 | 6432 | |
2c47e605 YZ |
6433 | /* wc->stage == DROP_REFERENCE */ |
6434 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6435 | |
2c47e605 YZ |
6436 | if (wc->refs[level] == 1) { |
6437 | if (level == 0) { | |
6438 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6439 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
6440 | else | |
6441 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
6442 | BUG_ON(ret); | |
6443 | } | |
6444 | /* make block locked assertion in clean_tree_block happy */ | |
6445 | if (!path->locks[level] && | |
6446 | btrfs_header_generation(eb) == trans->transid) { | |
6447 | btrfs_tree_lock(eb); | |
6448 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6449 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6450 | } |
6451 | clean_tree_block(trans, root, eb); | |
6452 | } | |
6453 | ||
6454 | if (eb == root->node) { | |
6455 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6456 | parent = eb->start; | |
6457 | else | |
6458 | BUG_ON(root->root_key.objectid != | |
6459 | btrfs_header_owner(eb)); | |
6460 | } else { | |
6461 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6462 | parent = path->nodes[level + 1]->start; | |
6463 | else | |
6464 | BUG_ON(root->root_key.objectid != | |
6465 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6466 | } |
f82d02d9 | 6467 | |
f0486c68 | 6468 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6469 | out: |
6470 | wc->refs[level] = 0; | |
6471 | wc->flags[level] = 0; | |
f0486c68 | 6472 | return 0; |
2c47e605 YZ |
6473 | } |
6474 | ||
6475 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6476 | struct btrfs_root *root, | |
6477 | struct btrfs_path *path, | |
6478 | struct walk_control *wc) | |
6479 | { | |
2c47e605 | 6480 | int level = wc->level; |
94fcca9f | 6481 | int lookup_info = 1; |
2c47e605 YZ |
6482 | int ret; |
6483 | ||
6484 | while (level >= 0) { | |
94fcca9f | 6485 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6486 | if (ret > 0) |
6487 | break; | |
6488 | ||
6489 | if (level == 0) | |
6490 | break; | |
6491 | ||
7a7965f8 YZ |
6492 | if (path->slots[level] >= |
6493 | btrfs_header_nritems(path->nodes[level])) | |
6494 | break; | |
6495 | ||
94fcca9f | 6496 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6497 | if (ret > 0) { |
6498 | path->slots[level]++; | |
6499 | continue; | |
90d2c51d MX |
6500 | } else if (ret < 0) |
6501 | return ret; | |
1c4850e2 | 6502 | level = wc->level; |
f82d02d9 | 6503 | } |
f82d02d9 YZ |
6504 | return 0; |
6505 | } | |
6506 | ||
d397712b | 6507 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6508 | struct btrfs_root *root, |
f82d02d9 | 6509 | struct btrfs_path *path, |
2c47e605 | 6510 | struct walk_control *wc, int max_level) |
20524f02 | 6511 | { |
2c47e605 | 6512 | int level = wc->level; |
20524f02 | 6513 | int ret; |
9f3a7427 | 6514 | |
2c47e605 YZ |
6515 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6516 | while (level < max_level && path->nodes[level]) { | |
6517 | wc->level = level; | |
6518 | if (path->slots[level] + 1 < | |
6519 | btrfs_header_nritems(path->nodes[level])) { | |
6520 | path->slots[level]++; | |
20524f02 CM |
6521 | return 0; |
6522 | } else { | |
2c47e605 YZ |
6523 | ret = walk_up_proc(trans, root, path, wc); |
6524 | if (ret > 0) | |
6525 | return 0; | |
bd56b302 | 6526 | |
2c47e605 | 6527 | if (path->locks[level]) { |
bd681513 CM |
6528 | btrfs_tree_unlock_rw(path->nodes[level], |
6529 | path->locks[level]); | |
2c47e605 | 6530 | path->locks[level] = 0; |
f82d02d9 | 6531 | } |
2c47e605 YZ |
6532 | free_extent_buffer(path->nodes[level]); |
6533 | path->nodes[level] = NULL; | |
6534 | level++; | |
20524f02 CM |
6535 | } |
6536 | } | |
6537 | return 1; | |
6538 | } | |
6539 | ||
9aca1d51 | 6540 | /* |
2c47e605 YZ |
6541 | * drop a subvolume tree. |
6542 | * | |
6543 | * this function traverses the tree freeing any blocks that only | |
6544 | * referenced by the tree. | |
6545 | * | |
6546 | * when a shared tree block is found. this function decreases its | |
6547 | * reference count by one. if update_ref is true, this function | |
6548 | * also make sure backrefs for the shared block and all lower level | |
6549 | * blocks are properly updated. | |
9aca1d51 | 6550 | */ |
cb1b69f4 TI |
6551 | void btrfs_drop_snapshot(struct btrfs_root *root, |
6552 | struct btrfs_block_rsv *block_rsv, int update_ref) | |
20524f02 | 6553 | { |
5caf2a00 | 6554 | struct btrfs_path *path; |
2c47e605 YZ |
6555 | struct btrfs_trans_handle *trans; |
6556 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 6557 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
6558 | struct walk_control *wc; |
6559 | struct btrfs_key key; | |
6560 | int err = 0; | |
6561 | int ret; | |
6562 | int level; | |
20524f02 | 6563 | |
5caf2a00 | 6564 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
6565 | if (!path) { |
6566 | err = -ENOMEM; | |
6567 | goto out; | |
6568 | } | |
20524f02 | 6569 | |
2c47e605 | 6570 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
6571 | if (!wc) { |
6572 | btrfs_free_path(path); | |
cb1b69f4 TI |
6573 | err = -ENOMEM; |
6574 | goto out; | |
38a1a919 | 6575 | } |
2c47e605 | 6576 | |
a22285a6 | 6577 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 TI |
6578 | BUG_ON(IS_ERR(trans)); |
6579 | ||
3fd0a558 YZ |
6580 | if (block_rsv) |
6581 | trans->block_rsv = block_rsv; | |
2c47e605 | 6582 | |
9f3a7427 | 6583 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 6584 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
6585 | path->nodes[level] = btrfs_lock_root_node(root); |
6586 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 6587 | path->slots[level] = 0; |
bd681513 | 6588 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6589 | memset(&wc->update_progress, 0, |
6590 | sizeof(wc->update_progress)); | |
9f3a7427 | 6591 | } else { |
9f3a7427 | 6592 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
6593 | memcpy(&wc->update_progress, &key, |
6594 | sizeof(wc->update_progress)); | |
6595 | ||
6702ed49 | 6596 | level = root_item->drop_level; |
2c47e605 | 6597 | BUG_ON(level == 0); |
6702ed49 | 6598 | path->lowest_level = level; |
2c47e605 YZ |
6599 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6600 | path->lowest_level = 0; | |
6601 | if (ret < 0) { | |
6602 | err = ret; | |
cb1b69f4 | 6603 | goto out_free; |
9f3a7427 | 6604 | } |
1c4850e2 | 6605 | WARN_ON(ret > 0); |
2c47e605 | 6606 | |
7d9eb12c CM |
6607 | /* |
6608 | * unlock our path, this is safe because only this | |
6609 | * function is allowed to delete this snapshot | |
6610 | */ | |
5d4f98a2 | 6611 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
6612 | |
6613 | level = btrfs_header_level(root->node); | |
6614 | while (1) { | |
6615 | btrfs_tree_lock(path->nodes[level]); | |
6616 | btrfs_set_lock_blocking(path->nodes[level]); | |
6617 | ||
6618 | ret = btrfs_lookup_extent_info(trans, root, | |
6619 | path->nodes[level]->start, | |
6620 | path->nodes[level]->len, | |
6621 | &wc->refs[level], | |
6622 | &wc->flags[level]); | |
6623 | BUG_ON(ret); | |
6624 | BUG_ON(wc->refs[level] == 0); | |
6625 | ||
6626 | if (level == root_item->drop_level) | |
6627 | break; | |
6628 | ||
6629 | btrfs_tree_unlock(path->nodes[level]); | |
6630 | WARN_ON(wc->refs[level] != 1); | |
6631 | level--; | |
6632 | } | |
9f3a7427 | 6633 | } |
2c47e605 YZ |
6634 | |
6635 | wc->level = level; | |
6636 | wc->shared_level = -1; | |
6637 | wc->stage = DROP_REFERENCE; | |
6638 | wc->update_ref = update_ref; | |
6639 | wc->keep_locks = 0; | |
1c4850e2 | 6640 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 6641 | |
d397712b | 6642 | while (1) { |
2c47e605 YZ |
6643 | ret = walk_down_tree(trans, root, path, wc); |
6644 | if (ret < 0) { | |
6645 | err = ret; | |
20524f02 | 6646 | break; |
2c47e605 | 6647 | } |
9aca1d51 | 6648 | |
2c47e605 YZ |
6649 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
6650 | if (ret < 0) { | |
6651 | err = ret; | |
20524f02 | 6652 | break; |
2c47e605 YZ |
6653 | } |
6654 | ||
6655 | if (ret > 0) { | |
6656 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
6657 | break; |
6658 | } | |
2c47e605 YZ |
6659 | |
6660 | if (wc->stage == DROP_REFERENCE) { | |
6661 | level = wc->level; | |
6662 | btrfs_node_key(path->nodes[level], | |
6663 | &root_item->drop_progress, | |
6664 | path->slots[level]); | |
6665 | root_item->drop_level = level; | |
6666 | } | |
6667 | ||
6668 | BUG_ON(wc->level == 0); | |
3fd0a558 | 6669 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
6670 | ret = btrfs_update_root(trans, tree_root, |
6671 | &root->root_key, | |
6672 | root_item); | |
6673 | BUG_ON(ret); | |
6674 | ||
3fd0a558 | 6675 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 6676 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 | 6677 | BUG_ON(IS_ERR(trans)); |
3fd0a558 YZ |
6678 | if (block_rsv) |
6679 | trans->block_rsv = block_rsv; | |
c3e69d58 | 6680 | } |
20524f02 | 6681 | } |
b3b4aa74 | 6682 | btrfs_release_path(path); |
2c47e605 YZ |
6683 | BUG_ON(err); |
6684 | ||
6685 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
6686 | BUG_ON(ret); | |
6687 | ||
76dda93c YZ |
6688 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
6689 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
6690 | NULL, NULL); | |
6691 | BUG_ON(ret < 0); | |
6692 | if (ret > 0) { | |
84cd948c JB |
6693 | /* if we fail to delete the orphan item this time |
6694 | * around, it'll get picked up the next time. | |
6695 | * | |
6696 | * The most common failure here is just -ENOENT. | |
6697 | */ | |
6698 | btrfs_del_orphan_item(trans, tree_root, | |
6699 | root->root_key.objectid); | |
76dda93c YZ |
6700 | } |
6701 | } | |
6702 | ||
6703 | if (root->in_radix) { | |
6704 | btrfs_free_fs_root(tree_root->fs_info, root); | |
6705 | } else { | |
6706 | free_extent_buffer(root->node); | |
6707 | free_extent_buffer(root->commit_root); | |
6708 | kfree(root); | |
6709 | } | |
cb1b69f4 | 6710 | out_free: |
3fd0a558 | 6711 | btrfs_end_transaction_throttle(trans, tree_root); |
2c47e605 | 6712 | kfree(wc); |
5caf2a00 | 6713 | btrfs_free_path(path); |
cb1b69f4 TI |
6714 | out: |
6715 | if (err) | |
6716 | btrfs_std_error(root->fs_info, err); | |
6717 | return; | |
20524f02 | 6718 | } |
9078a3e1 | 6719 | |
2c47e605 YZ |
6720 | /* |
6721 | * drop subtree rooted at tree block 'node'. | |
6722 | * | |
6723 | * NOTE: this function will unlock and release tree block 'node' | |
6724 | */ | |
f82d02d9 YZ |
6725 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6726 | struct btrfs_root *root, | |
6727 | struct extent_buffer *node, | |
6728 | struct extent_buffer *parent) | |
6729 | { | |
6730 | struct btrfs_path *path; | |
2c47e605 | 6731 | struct walk_control *wc; |
f82d02d9 YZ |
6732 | int level; |
6733 | int parent_level; | |
6734 | int ret = 0; | |
6735 | int wret; | |
6736 | ||
2c47e605 YZ |
6737 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6738 | ||
f82d02d9 | 6739 | path = btrfs_alloc_path(); |
db5b493a TI |
6740 | if (!path) |
6741 | return -ENOMEM; | |
f82d02d9 | 6742 | |
2c47e605 | 6743 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
6744 | if (!wc) { |
6745 | btrfs_free_path(path); | |
6746 | return -ENOMEM; | |
6747 | } | |
2c47e605 | 6748 | |
b9447ef8 | 6749 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6750 | parent_level = btrfs_header_level(parent); |
6751 | extent_buffer_get(parent); | |
6752 | path->nodes[parent_level] = parent; | |
6753 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6754 | ||
b9447ef8 | 6755 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6756 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6757 | path->nodes[level] = node; |
6758 | path->slots[level] = 0; | |
bd681513 | 6759 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6760 | |
6761 | wc->refs[parent_level] = 1; | |
6762 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6763 | wc->level = level; | |
6764 | wc->shared_level = -1; | |
6765 | wc->stage = DROP_REFERENCE; | |
6766 | wc->update_ref = 0; | |
6767 | wc->keep_locks = 1; | |
1c4850e2 | 6768 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6769 | |
6770 | while (1) { | |
2c47e605 YZ |
6771 | wret = walk_down_tree(trans, root, path, wc); |
6772 | if (wret < 0) { | |
f82d02d9 | 6773 | ret = wret; |
f82d02d9 | 6774 | break; |
2c47e605 | 6775 | } |
f82d02d9 | 6776 | |
2c47e605 | 6777 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6778 | if (wret < 0) |
6779 | ret = wret; | |
6780 | if (wret != 0) | |
6781 | break; | |
6782 | } | |
6783 | ||
2c47e605 | 6784 | kfree(wc); |
f82d02d9 YZ |
6785 | btrfs_free_path(path); |
6786 | return ret; | |
6787 | } | |
6788 | ||
ec44a35c CM |
6789 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
6790 | { | |
6791 | u64 num_devices; | |
6792 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
6793 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
6794 | ||
cd02dca5 CM |
6795 | /* |
6796 | * we add in the count of missing devices because we want | |
6797 | * to make sure that any RAID levels on a degraded FS | |
6798 | * continue to be honored. | |
6799 | */ | |
6800 | num_devices = root->fs_info->fs_devices->rw_devices + | |
6801 | root->fs_info->fs_devices->missing_devices; | |
6802 | ||
ec44a35c CM |
6803 | if (num_devices == 1) { |
6804 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6805 | stripped = flags & ~stripped; | |
6806 | ||
6807 | /* turn raid0 into single device chunks */ | |
6808 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
6809 | return stripped; | |
6810 | ||
6811 | /* turn mirroring into duplication */ | |
6812 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6813 | BTRFS_BLOCK_GROUP_RAID10)) | |
6814 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
6815 | return flags; | |
6816 | } else { | |
6817 | /* they already had raid on here, just return */ | |
ec44a35c CM |
6818 | if (flags & stripped) |
6819 | return flags; | |
6820 | ||
6821 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6822 | stripped = flags & ~stripped; | |
6823 | ||
6824 | /* switch duplicated blocks with raid1 */ | |
6825 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
6826 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
6827 | ||
6828 | /* turn single device chunks into raid0 */ | |
6829 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
6830 | } | |
6831 | return flags; | |
6832 | } | |
6833 | ||
199c36ea | 6834 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 6835 | { |
f0486c68 YZ |
6836 | struct btrfs_space_info *sinfo = cache->space_info; |
6837 | u64 num_bytes; | |
199c36ea | 6838 | u64 min_allocable_bytes; |
f0486c68 | 6839 | int ret = -ENOSPC; |
0ef3e66b | 6840 | |
c286ac48 | 6841 | |
199c36ea MX |
6842 | /* |
6843 | * We need some metadata space and system metadata space for | |
6844 | * allocating chunks in some corner cases until we force to set | |
6845 | * it to be readonly. | |
6846 | */ | |
6847 | if ((sinfo->flags & | |
6848 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
6849 | !force) | |
6850 | min_allocable_bytes = 1 * 1024 * 1024; | |
6851 | else | |
6852 | min_allocable_bytes = 0; | |
6853 | ||
f0486c68 YZ |
6854 | spin_lock(&sinfo->lock); |
6855 | spin_lock(&cache->lock); | |
61cfea9b W |
6856 | |
6857 | if (cache->ro) { | |
6858 | ret = 0; | |
6859 | goto out; | |
6860 | } | |
6861 | ||
f0486c68 YZ |
6862 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
6863 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6864 | ||
6865 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
6866 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
6867 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 6868 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
6869 | cache->ro = 1; |
6870 | ret = 0; | |
6871 | } | |
61cfea9b | 6872 | out: |
f0486c68 YZ |
6873 | spin_unlock(&cache->lock); |
6874 | spin_unlock(&sinfo->lock); | |
6875 | return ret; | |
6876 | } | |
7d9eb12c | 6877 | |
f0486c68 YZ |
6878 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
6879 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 6880 | |
f0486c68 YZ |
6881 | { |
6882 | struct btrfs_trans_handle *trans; | |
6883 | u64 alloc_flags; | |
6884 | int ret; | |
7d9eb12c | 6885 | |
f0486c68 | 6886 | BUG_ON(cache->ro); |
0ef3e66b | 6887 | |
ff5714cc | 6888 | trans = btrfs_join_transaction(root); |
f0486c68 | 6889 | BUG_ON(IS_ERR(trans)); |
5d4f98a2 | 6890 | |
f0486c68 YZ |
6891 | alloc_flags = update_block_group_flags(root, cache->flags); |
6892 | if (alloc_flags != cache->flags) | |
0e4f8f88 CM |
6893 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6894 | CHUNK_ALLOC_FORCE); | |
5d4f98a2 | 6895 | |
199c36ea | 6896 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
6897 | if (!ret) |
6898 | goto out; | |
6899 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
0e4f8f88 CM |
6900 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6901 | CHUNK_ALLOC_FORCE); | |
f0486c68 YZ |
6902 | if (ret < 0) |
6903 | goto out; | |
199c36ea | 6904 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
6905 | out: |
6906 | btrfs_end_transaction(trans, root); | |
6907 | return ret; | |
6908 | } | |
5d4f98a2 | 6909 | |
c87f08ca CM |
6910 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
6911 | struct btrfs_root *root, u64 type) | |
6912 | { | |
6913 | u64 alloc_flags = get_alloc_profile(root, type); | |
0e4f8f88 CM |
6914 | return do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6915 | CHUNK_ALLOC_FORCE); | |
c87f08ca CM |
6916 | } |
6917 | ||
6d07bcec MX |
6918 | /* |
6919 | * helper to account the unused space of all the readonly block group in the | |
6920 | * list. takes mirrors into account. | |
6921 | */ | |
6922 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
6923 | { | |
6924 | struct btrfs_block_group_cache *block_group; | |
6925 | u64 free_bytes = 0; | |
6926 | int factor; | |
6927 | ||
6928 | list_for_each_entry(block_group, groups_list, list) { | |
6929 | spin_lock(&block_group->lock); | |
6930 | ||
6931 | if (!block_group->ro) { | |
6932 | spin_unlock(&block_group->lock); | |
6933 | continue; | |
6934 | } | |
6935 | ||
6936 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6937 | BTRFS_BLOCK_GROUP_RAID10 | | |
6938 | BTRFS_BLOCK_GROUP_DUP)) | |
6939 | factor = 2; | |
6940 | else | |
6941 | factor = 1; | |
6942 | ||
6943 | free_bytes += (block_group->key.offset - | |
6944 | btrfs_block_group_used(&block_group->item)) * | |
6945 | factor; | |
6946 | ||
6947 | spin_unlock(&block_group->lock); | |
6948 | } | |
6949 | ||
6950 | return free_bytes; | |
6951 | } | |
6952 | ||
6953 | /* | |
6954 | * helper to account the unused space of all the readonly block group in the | |
6955 | * space_info. takes mirrors into account. | |
6956 | */ | |
6957 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
6958 | { | |
6959 | int i; | |
6960 | u64 free_bytes = 0; | |
6961 | ||
6962 | spin_lock(&sinfo->lock); | |
6963 | ||
6964 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
6965 | if (!list_empty(&sinfo->block_groups[i])) | |
6966 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
6967 | &sinfo->block_groups[i]); | |
6968 | ||
6969 | spin_unlock(&sinfo->lock); | |
6970 | ||
6971 | return free_bytes; | |
6972 | } | |
6973 | ||
f0486c68 YZ |
6974 | int btrfs_set_block_group_rw(struct btrfs_root *root, |
6975 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 6976 | { |
f0486c68 YZ |
6977 | struct btrfs_space_info *sinfo = cache->space_info; |
6978 | u64 num_bytes; | |
6979 | ||
6980 | BUG_ON(!cache->ro); | |
6981 | ||
6982 | spin_lock(&sinfo->lock); | |
6983 | spin_lock(&cache->lock); | |
6984 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
6985 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6986 | sinfo->bytes_readonly -= num_bytes; | |
6987 | cache->ro = 0; | |
6988 | spin_unlock(&cache->lock); | |
6989 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
6990 | return 0; |
6991 | } | |
6992 | ||
ba1bf481 JB |
6993 | /* |
6994 | * checks to see if its even possible to relocate this block group. | |
6995 | * | |
6996 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
6997 | * ok to go ahead and try. | |
6998 | */ | |
6999 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7000 | { |
ba1bf481 JB |
7001 | struct btrfs_block_group_cache *block_group; |
7002 | struct btrfs_space_info *space_info; | |
7003 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7004 | struct btrfs_device *device; | |
cdcb725c | 7005 | u64 min_free; |
6719db6a JB |
7006 | u64 dev_min = 1; |
7007 | u64 dev_nr = 0; | |
cdcb725c | 7008 | int index; |
ba1bf481 JB |
7009 | int full = 0; |
7010 | int ret = 0; | |
1a40e23b | 7011 | |
ba1bf481 | 7012 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7013 | |
ba1bf481 JB |
7014 | /* odd, couldn't find the block group, leave it alone */ |
7015 | if (!block_group) | |
7016 | return -1; | |
1a40e23b | 7017 | |
cdcb725c | 7018 | min_free = btrfs_block_group_used(&block_group->item); |
7019 | ||
ba1bf481 | 7020 | /* no bytes used, we're good */ |
cdcb725c | 7021 | if (!min_free) |
1a40e23b ZY |
7022 | goto out; |
7023 | ||
ba1bf481 JB |
7024 | space_info = block_group->space_info; |
7025 | spin_lock(&space_info->lock); | |
17d217fe | 7026 | |
ba1bf481 | 7027 | full = space_info->full; |
17d217fe | 7028 | |
ba1bf481 JB |
7029 | /* |
7030 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7031 | * relocate it unless we're able to allocate a new chunk below. |
7032 | * | |
7033 | * Otherwise, we need to make sure we have room in the space to handle | |
7034 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7035 | */ |
7ce618db | 7036 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 7037 | (space_info->bytes_used + space_info->bytes_reserved + |
7038 | space_info->bytes_pinned + space_info->bytes_readonly + | |
7039 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
7040 | spin_unlock(&space_info->lock); |
7041 | goto out; | |
17d217fe | 7042 | } |
ba1bf481 | 7043 | spin_unlock(&space_info->lock); |
ea8c2819 | 7044 | |
ba1bf481 JB |
7045 | /* |
7046 | * ok we don't have enough space, but maybe we have free space on our | |
7047 | * devices to allocate new chunks for relocation, so loop through our | |
7048 | * alloc devices and guess if we have enough space. However, if we | |
7049 | * were marked as full, then we know there aren't enough chunks, and we | |
7050 | * can just return. | |
7051 | */ | |
7052 | ret = -1; | |
7053 | if (full) | |
7054 | goto out; | |
ea8c2819 | 7055 | |
cdcb725c | 7056 | /* |
7057 | * index: | |
7058 | * 0: raid10 | |
7059 | * 1: raid1 | |
7060 | * 2: dup | |
7061 | * 3: raid0 | |
7062 | * 4: single | |
7063 | */ | |
7064 | index = get_block_group_index(block_group); | |
7065 | if (index == 0) { | |
7066 | dev_min = 4; | |
6719db6a JB |
7067 | /* Divide by 2 */ |
7068 | min_free >>= 1; | |
cdcb725c | 7069 | } else if (index == 1) { |
7070 | dev_min = 2; | |
7071 | } else if (index == 2) { | |
6719db6a JB |
7072 | /* Multiply by 2 */ |
7073 | min_free <<= 1; | |
cdcb725c | 7074 | } else if (index == 3) { |
7075 | dev_min = fs_devices->rw_devices; | |
6719db6a | 7076 | do_div(min_free, dev_min); |
cdcb725c | 7077 | } |
7078 | ||
ba1bf481 JB |
7079 | mutex_lock(&root->fs_info->chunk_mutex); |
7080 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 7081 | u64 dev_offset; |
56bec294 | 7082 | |
ba1bf481 JB |
7083 | /* |
7084 | * check to make sure we can actually find a chunk with enough | |
7085 | * space to fit our block group in. | |
7086 | */ | |
7087 | if (device->total_bytes > device->bytes_used + min_free) { | |
7088 | ret = find_free_dev_extent(NULL, device, min_free, | |
7bfc837d | 7089 | &dev_offset, NULL); |
ba1bf481 | 7090 | if (!ret) |
cdcb725c | 7091 | dev_nr++; |
7092 | ||
7093 | if (dev_nr >= dev_min) | |
73e48b27 | 7094 | break; |
cdcb725c | 7095 | |
ba1bf481 | 7096 | ret = -1; |
725c8463 | 7097 | } |
edbd8d4e | 7098 | } |
ba1bf481 | 7099 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 7100 | out: |
ba1bf481 | 7101 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
7102 | return ret; |
7103 | } | |
7104 | ||
b2950863 CH |
7105 | static int find_first_block_group(struct btrfs_root *root, |
7106 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7107 | { |
925baedd | 7108 | int ret = 0; |
0b86a832 CM |
7109 | struct btrfs_key found_key; |
7110 | struct extent_buffer *leaf; | |
7111 | int slot; | |
edbd8d4e | 7112 | |
0b86a832 CM |
7113 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7114 | if (ret < 0) | |
925baedd CM |
7115 | goto out; |
7116 | ||
d397712b | 7117 | while (1) { |
0b86a832 | 7118 | slot = path->slots[0]; |
edbd8d4e | 7119 | leaf = path->nodes[0]; |
0b86a832 CM |
7120 | if (slot >= btrfs_header_nritems(leaf)) { |
7121 | ret = btrfs_next_leaf(root, path); | |
7122 | if (ret == 0) | |
7123 | continue; | |
7124 | if (ret < 0) | |
925baedd | 7125 | goto out; |
0b86a832 | 7126 | break; |
edbd8d4e | 7127 | } |
0b86a832 | 7128 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7129 | |
0b86a832 | 7130 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7131 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7132 | ret = 0; | |
7133 | goto out; | |
7134 | } | |
0b86a832 | 7135 | path->slots[0]++; |
edbd8d4e | 7136 | } |
925baedd | 7137 | out: |
0b86a832 | 7138 | return ret; |
edbd8d4e CM |
7139 | } |
7140 | ||
0af3d00b JB |
7141 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
7142 | { | |
7143 | struct btrfs_block_group_cache *block_group; | |
7144 | u64 last = 0; | |
7145 | ||
7146 | while (1) { | |
7147 | struct inode *inode; | |
7148 | ||
7149 | block_group = btrfs_lookup_first_block_group(info, last); | |
7150 | while (block_group) { | |
7151 | spin_lock(&block_group->lock); | |
7152 | if (block_group->iref) | |
7153 | break; | |
7154 | spin_unlock(&block_group->lock); | |
7155 | block_group = next_block_group(info->tree_root, | |
7156 | block_group); | |
7157 | } | |
7158 | if (!block_group) { | |
7159 | if (last == 0) | |
7160 | break; | |
7161 | last = 0; | |
7162 | continue; | |
7163 | } | |
7164 | ||
7165 | inode = block_group->inode; | |
7166 | block_group->iref = 0; | |
7167 | block_group->inode = NULL; | |
7168 | spin_unlock(&block_group->lock); | |
7169 | iput(inode); | |
7170 | last = block_group->key.objectid + block_group->key.offset; | |
7171 | btrfs_put_block_group(block_group); | |
7172 | } | |
7173 | } | |
7174 | ||
1a40e23b ZY |
7175 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
7176 | { | |
7177 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 7178 | struct btrfs_space_info *space_info; |
11833d66 | 7179 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
7180 | struct rb_node *n; |
7181 | ||
11833d66 YZ |
7182 | down_write(&info->extent_commit_sem); |
7183 | while (!list_empty(&info->caching_block_groups)) { | |
7184 | caching_ctl = list_entry(info->caching_block_groups.next, | |
7185 | struct btrfs_caching_control, list); | |
7186 | list_del(&caching_ctl->list); | |
7187 | put_caching_control(caching_ctl); | |
7188 | } | |
7189 | up_write(&info->extent_commit_sem); | |
7190 | ||
1a40e23b ZY |
7191 | spin_lock(&info->block_group_cache_lock); |
7192 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
7193 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
7194 | cache_node); | |
1a40e23b ZY |
7195 | rb_erase(&block_group->cache_node, |
7196 | &info->block_group_cache_tree); | |
d899e052 YZ |
7197 | spin_unlock(&info->block_group_cache_lock); |
7198 | ||
80eb234a | 7199 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 7200 | list_del(&block_group->list); |
80eb234a | 7201 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 7202 | |
817d52f8 | 7203 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7204 | wait_block_group_cache_done(block_group); |
817d52f8 | 7205 | |
3c14874a JB |
7206 | /* |
7207 | * We haven't cached this block group, which means we could | |
7208 | * possibly have excluded extents on this block group. | |
7209 | */ | |
7210 | if (block_group->cached == BTRFS_CACHE_NO) | |
7211 | free_excluded_extents(info->extent_root, block_group); | |
7212 | ||
817d52f8 | 7213 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 7214 | btrfs_put_block_group(block_group); |
d899e052 YZ |
7215 | |
7216 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
7217 | } |
7218 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
7219 | |
7220 | /* now that all the block groups are freed, go through and | |
7221 | * free all the space_info structs. This is only called during | |
7222 | * the final stages of unmount, and so we know nobody is | |
7223 | * using them. We call synchronize_rcu() once before we start, | |
7224 | * just to be on the safe side. | |
7225 | */ | |
7226 | synchronize_rcu(); | |
7227 | ||
8929ecfa YZ |
7228 | release_global_block_rsv(info); |
7229 | ||
4184ea7f CM |
7230 | while(!list_empty(&info->space_info)) { |
7231 | space_info = list_entry(info->space_info.next, | |
7232 | struct btrfs_space_info, | |
7233 | list); | |
f0486c68 | 7234 | if (space_info->bytes_pinned > 0 || |
fb25e914 JB |
7235 | space_info->bytes_reserved > 0 || |
7236 | space_info->bytes_may_use > 0) { | |
f0486c68 YZ |
7237 | WARN_ON(1); |
7238 | dump_space_info(space_info, 0, 0); | |
7239 | } | |
4184ea7f CM |
7240 | list_del(&space_info->list); |
7241 | kfree(space_info); | |
7242 | } | |
1a40e23b ZY |
7243 | return 0; |
7244 | } | |
7245 | ||
b742bb82 YZ |
7246 | static void __link_block_group(struct btrfs_space_info *space_info, |
7247 | struct btrfs_block_group_cache *cache) | |
7248 | { | |
7249 | int index = get_block_group_index(cache); | |
7250 | ||
7251 | down_write(&space_info->groups_sem); | |
7252 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
7253 | up_write(&space_info->groups_sem); | |
7254 | } | |
7255 | ||
9078a3e1 CM |
7256 | int btrfs_read_block_groups(struct btrfs_root *root) |
7257 | { | |
7258 | struct btrfs_path *path; | |
7259 | int ret; | |
9078a3e1 | 7260 | struct btrfs_block_group_cache *cache; |
be744175 | 7261 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7262 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7263 | struct btrfs_key key; |
7264 | struct btrfs_key found_key; | |
5f39d397 | 7265 | struct extent_buffer *leaf; |
0af3d00b JB |
7266 | int need_clear = 0; |
7267 | u64 cache_gen; | |
96b5179d | 7268 | |
be744175 | 7269 | root = info->extent_root; |
9078a3e1 | 7270 | key.objectid = 0; |
0b86a832 | 7271 | key.offset = 0; |
9078a3e1 | 7272 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7273 | path = btrfs_alloc_path(); |
7274 | if (!path) | |
7275 | return -ENOMEM; | |
026fd317 | 7276 | path->reada = 1; |
9078a3e1 | 7277 | |
6c41761f | 7278 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 7279 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 7280 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 7281 | need_clear = 1; |
88c2ba3b JB |
7282 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
7283 | need_clear = 1; | |
0af3d00b | 7284 | |
d397712b | 7285 | while (1) { |
0b86a832 | 7286 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
7287 | if (ret > 0) |
7288 | break; | |
0b86a832 CM |
7289 | if (ret != 0) |
7290 | goto error; | |
5f39d397 CM |
7291 | leaf = path->nodes[0]; |
7292 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7293 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7294 | if (!cache) { |
0b86a832 | 7295 | ret = -ENOMEM; |
f0486c68 | 7296 | goto error; |
9078a3e1 | 7297 | } |
34d52cb6 LZ |
7298 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7299 | GFP_NOFS); | |
7300 | if (!cache->free_space_ctl) { | |
7301 | kfree(cache); | |
7302 | ret = -ENOMEM; | |
7303 | goto error; | |
7304 | } | |
3e1ad54f | 7305 | |
d2fb3437 | 7306 | atomic_set(&cache->count, 1); |
c286ac48 | 7307 | spin_lock_init(&cache->lock); |
817d52f8 | 7308 | cache->fs_info = info; |
0f9dd46c | 7309 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7310 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 7311 | |
0af3d00b JB |
7312 | if (need_clear) |
7313 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
7314 | ||
5f39d397 CM |
7315 | read_extent_buffer(leaf, &cache->item, |
7316 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7317 | sizeof(cache->item)); | |
9078a3e1 | 7318 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7319 | |
9078a3e1 | 7320 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 7321 | btrfs_release_path(path); |
0b86a832 | 7322 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
7323 | cache->sectorsize = root->sectorsize; |
7324 | ||
34d52cb6 LZ |
7325 | btrfs_init_free_space_ctl(cache); |
7326 | ||
3c14874a JB |
7327 | /* |
7328 | * We need to exclude the super stripes now so that the space | |
7329 | * info has super bytes accounted for, otherwise we'll think | |
7330 | * we have more space than we actually do. | |
7331 | */ | |
7332 | exclude_super_stripes(root, cache); | |
7333 | ||
817d52f8 JB |
7334 | /* |
7335 | * check for two cases, either we are full, and therefore | |
7336 | * don't need to bother with the caching work since we won't | |
7337 | * find any space, or we are empty, and we can just add all | |
7338 | * the space in and be done with it. This saves us _alot_ of | |
7339 | * time, particularly in the full case. | |
7340 | */ | |
7341 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 7342 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7343 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 7344 | free_excluded_extents(root, cache); |
817d52f8 | 7345 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 7346 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
7347 | cache->cached = BTRFS_CACHE_FINISHED; |
7348 | add_new_free_space(cache, root->fs_info, | |
7349 | found_key.objectid, | |
7350 | found_key.objectid + | |
7351 | found_key.offset); | |
11833d66 | 7352 | free_excluded_extents(root, cache); |
817d52f8 | 7353 | } |
96b5179d | 7354 | |
6324fbf3 CM |
7355 | ret = update_space_info(info, cache->flags, found_key.offset, |
7356 | btrfs_block_group_used(&cache->item), | |
7357 | &space_info); | |
7358 | BUG_ON(ret); | |
7359 | cache->space_info = space_info; | |
1b2da372 | 7360 | spin_lock(&cache->space_info->lock); |
f0486c68 | 7361 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7362 | spin_unlock(&cache->space_info->lock); |
7363 | ||
b742bb82 | 7364 | __link_block_group(space_info, cache); |
0f9dd46c JB |
7365 | |
7366 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
7367 | BUG_ON(ret); | |
75ccf47d CM |
7368 | |
7369 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 7370 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 7371 | set_block_group_ro(cache, 1); |
9078a3e1 | 7372 | } |
b742bb82 YZ |
7373 | |
7374 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
7375 | if (!(get_alloc_profile(root, space_info->flags) & | |
7376 | (BTRFS_BLOCK_GROUP_RAID10 | | |
7377 | BTRFS_BLOCK_GROUP_RAID1 | | |
7378 | BTRFS_BLOCK_GROUP_DUP))) | |
7379 | continue; | |
7380 | /* | |
7381 | * avoid allocating from un-mirrored block group if there are | |
7382 | * mirrored block groups. | |
7383 | */ | |
7384 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 7385 | set_block_group_ro(cache, 1); |
b742bb82 | 7386 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 7387 | set_block_group_ro(cache, 1); |
9078a3e1 | 7388 | } |
f0486c68 YZ |
7389 | |
7390 | init_global_block_rsv(info); | |
0b86a832 CM |
7391 | ret = 0; |
7392 | error: | |
9078a3e1 | 7393 | btrfs_free_path(path); |
0b86a832 | 7394 | return ret; |
9078a3e1 | 7395 | } |
6324fbf3 CM |
7396 | |
7397 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
7398 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7399 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7400 | u64 size) |
7401 | { | |
7402 | int ret; | |
6324fbf3 CM |
7403 | struct btrfs_root *extent_root; |
7404 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7405 | |
7406 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7407 | |
12fcfd22 | 7408 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 7409 | |
8f18cf13 | 7410 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
7411 | if (!cache) |
7412 | return -ENOMEM; | |
34d52cb6 LZ |
7413 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7414 | GFP_NOFS); | |
7415 | if (!cache->free_space_ctl) { | |
7416 | kfree(cache); | |
7417 | return -ENOMEM; | |
7418 | } | |
0f9dd46c | 7419 | |
e17cade2 | 7420 | cache->key.objectid = chunk_offset; |
6324fbf3 | 7421 | cache->key.offset = size; |
d2fb3437 | 7422 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 7423 | cache->sectorsize = root->sectorsize; |
0af3d00b | 7424 | cache->fs_info = root->fs_info; |
96303081 | 7425 | |
d2fb3437 | 7426 | atomic_set(&cache->count, 1); |
c286ac48 | 7427 | spin_lock_init(&cache->lock); |
0f9dd46c | 7428 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7429 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 7430 | |
34d52cb6 LZ |
7431 | btrfs_init_free_space_ctl(cache); |
7432 | ||
6324fbf3 | 7433 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
7434 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
7435 | cache->flags = type; | |
7436 | btrfs_set_block_group_flags(&cache->item, type); | |
7437 | ||
11833d66 | 7438 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7439 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 7440 | exclude_super_stripes(root, cache); |
96303081 | 7441 | |
817d52f8 JB |
7442 | add_new_free_space(cache, root->fs_info, chunk_offset, |
7443 | chunk_offset + size); | |
7444 | ||
11833d66 YZ |
7445 | free_excluded_extents(root, cache); |
7446 | ||
6324fbf3 CM |
7447 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
7448 | &cache->space_info); | |
7449 | BUG_ON(ret); | |
1b2da372 JB |
7450 | |
7451 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 7452 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7453 | spin_unlock(&cache->space_info->lock); |
7454 | ||
b742bb82 | 7455 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 7456 | |
0f9dd46c JB |
7457 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
7458 | BUG_ON(ret); | |
c286ac48 | 7459 | |
6324fbf3 CM |
7460 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
7461 | sizeof(cache->item)); | |
7462 | BUG_ON(ret); | |
7463 | ||
d18a2c44 | 7464 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 7465 | |
6324fbf3 CM |
7466 | return 0; |
7467 | } | |
1a40e23b ZY |
7468 | |
7469 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
7470 | struct btrfs_root *root, u64 group_start) | |
7471 | { | |
7472 | struct btrfs_path *path; | |
7473 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 7474 | struct btrfs_free_cluster *cluster; |
0af3d00b | 7475 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 7476 | struct btrfs_key key; |
0af3d00b | 7477 | struct inode *inode; |
1a40e23b | 7478 | int ret; |
89a55897 | 7479 | int factor; |
1a40e23b | 7480 | |
1a40e23b ZY |
7481 | root = root->fs_info->extent_root; |
7482 | ||
7483 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
7484 | BUG_ON(!block_group); | |
c146afad | 7485 | BUG_ON(!block_group->ro); |
1a40e23b | 7486 | |
9f7c43c9 | 7487 | /* |
7488 | * Free the reserved super bytes from this block group before | |
7489 | * remove it. | |
7490 | */ | |
7491 | free_excluded_extents(root, block_group); | |
7492 | ||
1a40e23b | 7493 | memcpy(&key, &block_group->key, sizeof(key)); |
89a55897 JB |
7494 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
7495 | BTRFS_BLOCK_GROUP_RAID1 | | |
7496 | BTRFS_BLOCK_GROUP_RAID10)) | |
7497 | factor = 2; | |
7498 | else | |
7499 | factor = 1; | |
1a40e23b | 7500 | |
44fb5511 CM |
7501 | /* make sure this block group isn't part of an allocation cluster */ |
7502 | cluster = &root->fs_info->data_alloc_cluster; | |
7503 | spin_lock(&cluster->refill_lock); | |
7504 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7505 | spin_unlock(&cluster->refill_lock); | |
7506 | ||
7507 | /* | |
7508 | * make sure this block group isn't part of a metadata | |
7509 | * allocation cluster | |
7510 | */ | |
7511 | cluster = &root->fs_info->meta_alloc_cluster; | |
7512 | spin_lock(&cluster->refill_lock); | |
7513 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7514 | spin_unlock(&cluster->refill_lock); | |
7515 | ||
1a40e23b | 7516 | path = btrfs_alloc_path(); |
d8926bb3 MF |
7517 | if (!path) { |
7518 | ret = -ENOMEM; | |
7519 | goto out; | |
7520 | } | |
1a40e23b | 7521 | |
10b2f34d | 7522 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 7523 | if (!IS_ERR(inode)) { |
b532402e TI |
7524 | ret = btrfs_orphan_add(trans, inode); |
7525 | BUG_ON(ret); | |
0af3d00b JB |
7526 | clear_nlink(inode); |
7527 | /* One for the block groups ref */ | |
7528 | spin_lock(&block_group->lock); | |
7529 | if (block_group->iref) { | |
7530 | block_group->iref = 0; | |
7531 | block_group->inode = NULL; | |
7532 | spin_unlock(&block_group->lock); | |
7533 | iput(inode); | |
7534 | } else { | |
7535 | spin_unlock(&block_group->lock); | |
7536 | } | |
7537 | /* One for our lookup ref */ | |
455757c3 | 7538 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
7539 | } |
7540 | ||
7541 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
7542 | key.offset = block_group->key.objectid; | |
7543 | key.type = 0; | |
7544 | ||
7545 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
7546 | if (ret < 0) | |
7547 | goto out; | |
7548 | if (ret > 0) | |
b3b4aa74 | 7549 | btrfs_release_path(path); |
0af3d00b JB |
7550 | if (ret == 0) { |
7551 | ret = btrfs_del_item(trans, tree_root, path); | |
7552 | if (ret) | |
7553 | goto out; | |
b3b4aa74 | 7554 | btrfs_release_path(path); |
0af3d00b JB |
7555 | } |
7556 | ||
3dfdb934 | 7557 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
7558 | rb_erase(&block_group->cache_node, |
7559 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 7560 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 7561 | |
80eb234a | 7562 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
7563 | /* |
7564 | * we must use list_del_init so people can check to see if they | |
7565 | * are still on the list after taking the semaphore | |
7566 | */ | |
7567 | list_del_init(&block_group->list); | |
80eb234a | 7568 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 7569 | |
817d52f8 | 7570 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7571 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7572 | |
7573 | btrfs_remove_free_space_cache(block_group); | |
7574 | ||
c146afad YZ |
7575 | spin_lock(&block_group->space_info->lock); |
7576 | block_group->space_info->total_bytes -= block_group->key.offset; | |
7577 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 7578 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 7579 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 7580 | |
0af3d00b JB |
7581 | memcpy(&key, &block_group->key, sizeof(key)); |
7582 | ||
283bb197 | 7583 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 7584 | |
fa9c0d79 CM |
7585 | btrfs_put_block_group(block_group); |
7586 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
7587 | |
7588 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
7589 | if (ret > 0) | |
7590 | ret = -EIO; | |
7591 | if (ret < 0) | |
7592 | goto out; | |
7593 | ||
7594 | ret = btrfs_del_item(trans, root, path); | |
7595 | out: | |
7596 | btrfs_free_path(path); | |
7597 | return ret; | |
7598 | } | |
acce952b | 7599 | |
c59021f8 | 7600 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
7601 | { | |
7602 | struct btrfs_space_info *space_info; | |
1aba86d6 | 7603 | struct btrfs_super_block *disk_super; |
7604 | u64 features; | |
7605 | u64 flags; | |
7606 | int mixed = 0; | |
c59021f8 | 7607 | int ret; |
7608 | ||
6c41761f | 7609 | disk_super = fs_info->super_copy; |
1aba86d6 | 7610 | if (!btrfs_super_root(disk_super)) |
7611 | return 1; | |
c59021f8 | 7612 | |
1aba86d6 | 7613 | features = btrfs_super_incompat_flags(disk_super); |
7614 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
7615 | mixed = 1; | |
c59021f8 | 7616 | |
1aba86d6 | 7617 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
7618 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 7619 | if (ret) |
1aba86d6 | 7620 | goto out; |
c59021f8 | 7621 | |
1aba86d6 | 7622 | if (mixed) { |
7623 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
7624 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7625 | } else { | |
7626 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
7627 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7628 | if (ret) | |
7629 | goto out; | |
7630 | ||
7631 | flags = BTRFS_BLOCK_GROUP_DATA; | |
7632 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7633 | } | |
7634 | out: | |
c59021f8 | 7635 | return ret; |
7636 | } | |
7637 | ||
acce952b | 7638 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
7639 | { | |
7640 | return unpin_extent_range(root, start, end); | |
7641 | } | |
7642 | ||
7643 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 7644 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 7645 | { |
5378e607 | 7646 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 7647 | } |
f7039b1d LD |
7648 | |
7649 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
7650 | { | |
7651 | struct btrfs_fs_info *fs_info = root->fs_info; | |
7652 | struct btrfs_block_group_cache *cache = NULL; | |
7653 | u64 group_trimmed; | |
7654 | u64 start; | |
7655 | u64 end; | |
7656 | u64 trimmed = 0; | |
7657 | int ret = 0; | |
7658 | ||
7659 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
7660 | ||
7661 | while (cache) { | |
7662 | if (cache->key.objectid >= (range->start + range->len)) { | |
7663 | btrfs_put_block_group(cache); | |
7664 | break; | |
7665 | } | |
7666 | ||
7667 | start = max(range->start, cache->key.objectid); | |
7668 | end = min(range->start + range->len, | |
7669 | cache->key.objectid + cache->key.offset); | |
7670 | ||
7671 | if (end - start >= range->minlen) { | |
7672 | if (!block_group_cache_done(cache)) { | |
7673 | ret = cache_block_group(cache, NULL, root, 0); | |
7674 | if (!ret) | |
7675 | wait_block_group_cache_done(cache); | |
7676 | } | |
7677 | ret = btrfs_trim_block_group(cache, | |
7678 | &group_trimmed, | |
7679 | start, | |
7680 | end, | |
7681 | range->minlen); | |
7682 | ||
7683 | trimmed += group_trimmed; | |
7684 | if (ret) { | |
7685 | btrfs_put_block_group(cache); | |
7686 | break; | |
7687 | } | |
7688 | } | |
7689 | ||
7690 | cache = next_block_group(fs_info->tree_root, cache); | |
7691 | } | |
7692 | ||
7693 | range->len = trimmed; | |
7694 | return ret; | |
7695 | } |