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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" |
3fed40cc | 36 | #include "math.h" |
fec577fb | 37 | |
709c0486 AJ |
38 | #undef SCRAMBLE_DELAYED_REFS |
39 | ||
9e622d6b MX |
40 | /* |
41 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
42 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
43 | * if we really need one. | |
44 | * | |
0e4f8f88 CM |
45 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
46 | * if we have very few chunks already allocated. This is | |
47 | * used as part of the clustering code to help make sure | |
48 | * we have a good pool of storage to cluster in, without | |
49 | * filling the FS with empty chunks | |
50 | * | |
9e622d6b MX |
51 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
52 | * | |
0e4f8f88 CM |
53 | */ |
54 | enum { | |
55 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
56 | CHUNK_ALLOC_LIMITED = 1, |
57 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
58 | }; |
59 | ||
fb25e914 JB |
60 | /* |
61 | * Control how reservations are dealt with. | |
62 | * | |
63 | * RESERVE_FREE - freeing a reservation. | |
64 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
65 | * ENOSPC accounting | |
66 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
67 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
68 | */ | |
69 | enum { | |
70 | RESERVE_FREE = 0, | |
71 | RESERVE_ALLOC = 1, | |
72 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
73 | }; | |
74 | ||
c53d613e | 75 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 76 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
77 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
78 | struct btrfs_root *root, | |
79 | u64 bytenr, u64 num_bytes, u64 parent, | |
80 | u64 root_objectid, u64 owner_objectid, | |
81 | u64 owner_offset, int refs_to_drop, | |
82 | struct btrfs_delayed_extent_op *extra_op); | |
83 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
84 | struct extent_buffer *leaf, | |
85 | struct btrfs_extent_item *ei); | |
86 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
87 | struct btrfs_root *root, | |
88 | u64 parent, u64 root_objectid, | |
89 | u64 flags, u64 owner, u64 offset, | |
90 | struct btrfs_key *ins, int ref_mod); | |
91 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
92 | struct btrfs_root *root, | |
93 | u64 parent, u64 root_objectid, | |
94 | u64 flags, struct btrfs_disk_key *key, | |
95 | int level, struct btrfs_key *ins); | |
6a63209f | 96 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
97 | struct btrfs_root *extent_root, u64 flags, |
98 | int force); | |
11833d66 YZ |
99 | static int find_next_key(struct btrfs_path *path, int level, |
100 | struct btrfs_key *key); | |
9ed74f2d JB |
101 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
102 | int dump_block_groups); | |
fb25e914 JB |
103 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
104 | u64 num_bytes, int reserve); | |
5d80366e JB |
105 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
106 | u64 num_bytes); | |
6a63209f | 107 | |
817d52f8 JB |
108 | static noinline int |
109 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
110 | { | |
111 | smp_mb(); | |
112 | return cache->cached == BTRFS_CACHE_FINISHED; | |
113 | } | |
114 | ||
0f9dd46c JB |
115 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
116 | { | |
117 | return (cache->flags & bits) == bits; | |
118 | } | |
119 | ||
62a45b60 | 120 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
121 | { |
122 | atomic_inc(&cache->count); | |
123 | } | |
124 | ||
125 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
126 | { | |
f0486c68 YZ |
127 | if (atomic_dec_and_test(&cache->count)) { |
128 | WARN_ON(cache->pinned > 0); | |
129 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 130 | kfree(cache->free_space_ctl); |
11dfe35a | 131 | kfree(cache); |
f0486c68 | 132 | } |
11dfe35a JB |
133 | } |
134 | ||
0f9dd46c JB |
135 | /* |
136 | * this adds the block group to the fs_info rb tree for the block group | |
137 | * cache | |
138 | */ | |
b2950863 | 139 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
140 | struct btrfs_block_group_cache *block_group) |
141 | { | |
142 | struct rb_node **p; | |
143 | struct rb_node *parent = NULL; | |
144 | struct btrfs_block_group_cache *cache; | |
145 | ||
146 | spin_lock(&info->block_group_cache_lock); | |
147 | p = &info->block_group_cache_tree.rb_node; | |
148 | ||
149 | while (*p) { | |
150 | parent = *p; | |
151 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
152 | cache_node); | |
153 | if (block_group->key.objectid < cache->key.objectid) { | |
154 | p = &(*p)->rb_left; | |
155 | } else if (block_group->key.objectid > cache->key.objectid) { | |
156 | p = &(*p)->rb_right; | |
157 | } else { | |
158 | spin_unlock(&info->block_group_cache_lock); | |
159 | return -EEXIST; | |
160 | } | |
161 | } | |
162 | ||
163 | rb_link_node(&block_group->cache_node, parent, p); | |
164 | rb_insert_color(&block_group->cache_node, | |
165 | &info->block_group_cache_tree); | |
a1897fdd LB |
166 | |
167 | if (info->first_logical_byte > block_group->key.objectid) | |
168 | info->first_logical_byte = block_group->key.objectid; | |
169 | ||
0f9dd46c JB |
170 | spin_unlock(&info->block_group_cache_lock); |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | /* | |
176 | * This will return the block group at or after bytenr if contains is 0, else | |
177 | * it will return the block group that contains the bytenr | |
178 | */ | |
179 | static struct btrfs_block_group_cache * | |
180 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
181 | int contains) | |
182 | { | |
183 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
184 | struct rb_node *n; | |
185 | u64 end, start; | |
186 | ||
187 | spin_lock(&info->block_group_cache_lock); | |
188 | n = info->block_group_cache_tree.rb_node; | |
189 | ||
190 | while (n) { | |
191 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
192 | cache_node); | |
193 | end = cache->key.objectid + cache->key.offset - 1; | |
194 | start = cache->key.objectid; | |
195 | ||
196 | if (bytenr < start) { | |
197 | if (!contains && (!ret || start < ret->key.objectid)) | |
198 | ret = cache; | |
199 | n = n->rb_left; | |
200 | } else if (bytenr > start) { | |
201 | if (contains && bytenr <= end) { | |
202 | ret = cache; | |
203 | break; | |
204 | } | |
205 | n = n->rb_right; | |
206 | } else { | |
207 | ret = cache; | |
208 | break; | |
209 | } | |
210 | } | |
a1897fdd | 211 | if (ret) { |
11dfe35a | 212 | btrfs_get_block_group(ret); |
a1897fdd LB |
213 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
214 | info->first_logical_byte = ret->key.objectid; | |
215 | } | |
0f9dd46c JB |
216 | spin_unlock(&info->block_group_cache_lock); |
217 | ||
218 | return ret; | |
219 | } | |
220 | ||
11833d66 YZ |
221 | static int add_excluded_extent(struct btrfs_root *root, |
222 | u64 start, u64 num_bytes) | |
817d52f8 | 223 | { |
11833d66 YZ |
224 | u64 end = start + num_bytes - 1; |
225 | set_extent_bits(&root->fs_info->freed_extents[0], | |
226 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
227 | set_extent_bits(&root->fs_info->freed_extents[1], | |
228 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
229 | return 0; | |
230 | } | |
817d52f8 | 231 | |
11833d66 YZ |
232 | static void free_excluded_extents(struct btrfs_root *root, |
233 | struct btrfs_block_group_cache *cache) | |
234 | { | |
235 | u64 start, end; | |
817d52f8 | 236 | |
11833d66 YZ |
237 | start = cache->key.objectid; |
238 | end = start + cache->key.offset - 1; | |
239 | ||
240 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
241 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
242 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
243 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
244 | } |
245 | ||
11833d66 YZ |
246 | static int exclude_super_stripes(struct btrfs_root *root, |
247 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 248 | { |
817d52f8 JB |
249 | u64 bytenr; |
250 | u64 *logical; | |
251 | int stripe_len; | |
252 | int i, nr, ret; | |
253 | ||
06b2331f YZ |
254 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
255 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
256 | cache->bytes_super += stripe_len; | |
257 | ret = add_excluded_extent(root, cache->key.objectid, | |
258 | stripe_len); | |
79787eaa | 259 | BUG_ON(ret); /* -ENOMEM */ |
06b2331f YZ |
260 | } |
261 | ||
817d52f8 JB |
262 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
263 | bytenr = btrfs_sb_offset(i); | |
264 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
265 | cache->key.objectid, bytenr, | |
266 | 0, &logical, &nr, &stripe_len); | |
79787eaa | 267 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 | 268 | |
817d52f8 | 269 | while (nr--) { |
1b2da372 | 270 | cache->bytes_super += stripe_len; |
11833d66 YZ |
271 | ret = add_excluded_extent(root, logical[nr], |
272 | stripe_len); | |
79787eaa | 273 | BUG_ON(ret); /* -ENOMEM */ |
817d52f8 | 274 | } |
11833d66 | 275 | |
817d52f8 JB |
276 | kfree(logical); |
277 | } | |
817d52f8 JB |
278 | return 0; |
279 | } | |
280 | ||
11833d66 YZ |
281 | static struct btrfs_caching_control * |
282 | get_caching_control(struct btrfs_block_group_cache *cache) | |
283 | { | |
284 | struct btrfs_caching_control *ctl; | |
285 | ||
286 | spin_lock(&cache->lock); | |
287 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
288 | spin_unlock(&cache->lock); | |
289 | return NULL; | |
290 | } | |
291 | ||
dde5abee JB |
292 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
293 | if (!cache->caching_ctl) { | |
294 | spin_unlock(&cache->lock); | |
11833d66 YZ |
295 | return NULL; |
296 | } | |
297 | ||
298 | ctl = cache->caching_ctl; | |
299 | atomic_inc(&ctl->count); | |
300 | spin_unlock(&cache->lock); | |
301 | return ctl; | |
302 | } | |
303 | ||
304 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
305 | { | |
306 | if (atomic_dec_and_test(&ctl->count)) | |
307 | kfree(ctl); | |
308 | } | |
309 | ||
0f9dd46c JB |
310 | /* |
311 | * this is only called by cache_block_group, since we could have freed extents | |
312 | * we need to check the pinned_extents for any extents that can't be used yet | |
313 | * since their free space will be released as soon as the transaction commits. | |
314 | */ | |
817d52f8 | 315 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
316 | struct btrfs_fs_info *info, u64 start, u64 end) |
317 | { | |
817d52f8 | 318 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
319 | int ret; |
320 | ||
321 | while (start < end) { | |
11833d66 | 322 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 323 | &extent_start, &extent_end, |
e6138876 JB |
324 | EXTENT_DIRTY | EXTENT_UPTODATE, |
325 | NULL); | |
0f9dd46c JB |
326 | if (ret) |
327 | break; | |
328 | ||
06b2331f | 329 | if (extent_start <= start) { |
0f9dd46c JB |
330 | start = extent_end + 1; |
331 | } else if (extent_start > start && extent_start < end) { | |
332 | size = extent_start - start; | |
817d52f8 | 333 | total_added += size; |
ea6a478e JB |
334 | ret = btrfs_add_free_space(block_group, start, |
335 | size); | |
79787eaa | 336 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
337 | start = extent_end + 1; |
338 | } else { | |
339 | break; | |
340 | } | |
341 | } | |
342 | ||
343 | if (start < end) { | |
344 | size = end - start; | |
817d52f8 | 345 | total_added += size; |
ea6a478e | 346 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 347 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
348 | } |
349 | ||
817d52f8 | 350 | return total_added; |
0f9dd46c JB |
351 | } |
352 | ||
bab39bf9 | 353 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 354 | { |
bab39bf9 JB |
355 | struct btrfs_block_group_cache *block_group; |
356 | struct btrfs_fs_info *fs_info; | |
357 | struct btrfs_caching_control *caching_ctl; | |
358 | struct btrfs_root *extent_root; | |
e37c9e69 | 359 | struct btrfs_path *path; |
5f39d397 | 360 | struct extent_buffer *leaf; |
11833d66 | 361 | struct btrfs_key key; |
817d52f8 | 362 | u64 total_found = 0; |
11833d66 YZ |
363 | u64 last = 0; |
364 | u32 nritems; | |
365 | int ret = 0; | |
f510cfec | 366 | |
bab39bf9 JB |
367 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
368 | block_group = caching_ctl->block_group; | |
369 | fs_info = block_group->fs_info; | |
370 | extent_root = fs_info->extent_root; | |
371 | ||
e37c9e69 CM |
372 | path = btrfs_alloc_path(); |
373 | if (!path) | |
bab39bf9 | 374 | goto out; |
7d7d6068 | 375 | |
817d52f8 | 376 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 377 | |
5cd57b2c | 378 | /* |
817d52f8 JB |
379 | * We don't want to deadlock with somebody trying to allocate a new |
380 | * extent for the extent root while also trying to search the extent | |
381 | * root to add free space. So we skip locking and search the commit | |
382 | * root, since its read-only | |
5cd57b2c CM |
383 | */ |
384 | path->skip_locking = 1; | |
817d52f8 | 385 | path->search_commit_root = 1; |
026fd317 | 386 | path->reada = 1; |
817d52f8 | 387 | |
e4404d6e | 388 | key.objectid = last; |
e37c9e69 | 389 | key.offset = 0; |
11833d66 | 390 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 391 | again: |
11833d66 | 392 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
393 | /* need to make sure the commit_root doesn't disappear */ |
394 | down_read(&fs_info->extent_commit_sem); | |
395 | ||
11833d66 | 396 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 397 | if (ret < 0) |
ef8bbdfe | 398 | goto err; |
a512bbf8 | 399 | |
11833d66 YZ |
400 | leaf = path->nodes[0]; |
401 | nritems = btrfs_header_nritems(leaf); | |
402 | ||
d397712b | 403 | while (1) { |
7841cb28 | 404 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 405 | last = (u64)-1; |
817d52f8 | 406 | break; |
f25784b3 | 407 | } |
817d52f8 | 408 | |
11833d66 YZ |
409 | if (path->slots[0] < nritems) { |
410 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
411 | } else { | |
412 | ret = find_next_key(path, 0, &key); | |
413 | if (ret) | |
e37c9e69 | 414 | break; |
817d52f8 | 415 | |
589d8ade JB |
416 | if (need_resched() || |
417 | btrfs_next_leaf(extent_root, path)) { | |
418 | caching_ctl->progress = last; | |
ff5714cc | 419 | btrfs_release_path(path); |
589d8ade JB |
420 | up_read(&fs_info->extent_commit_sem); |
421 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 422 | cond_resched(); |
589d8ade JB |
423 | goto again; |
424 | } | |
425 | leaf = path->nodes[0]; | |
426 | nritems = btrfs_header_nritems(leaf); | |
427 | continue; | |
11833d66 | 428 | } |
817d52f8 | 429 | |
11833d66 YZ |
430 | if (key.objectid < block_group->key.objectid) { |
431 | path->slots[0]++; | |
817d52f8 | 432 | continue; |
e37c9e69 | 433 | } |
0f9dd46c | 434 | |
e37c9e69 | 435 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 436 | block_group->key.offset) |
e37c9e69 | 437 | break; |
7d7d6068 | 438 | |
11833d66 | 439 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
440 | total_found += add_new_free_space(block_group, |
441 | fs_info, last, | |
442 | key.objectid); | |
7d7d6068 | 443 | last = key.objectid + key.offset; |
817d52f8 | 444 | |
11833d66 YZ |
445 | if (total_found > (1024 * 1024 * 2)) { |
446 | total_found = 0; | |
447 | wake_up(&caching_ctl->wait); | |
448 | } | |
817d52f8 | 449 | } |
e37c9e69 CM |
450 | path->slots[0]++; |
451 | } | |
817d52f8 | 452 | ret = 0; |
e37c9e69 | 453 | |
817d52f8 JB |
454 | total_found += add_new_free_space(block_group, fs_info, last, |
455 | block_group->key.objectid + | |
456 | block_group->key.offset); | |
11833d66 | 457 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
458 | |
459 | spin_lock(&block_group->lock); | |
11833d66 | 460 | block_group->caching_ctl = NULL; |
817d52f8 JB |
461 | block_group->cached = BTRFS_CACHE_FINISHED; |
462 | spin_unlock(&block_group->lock); | |
0f9dd46c | 463 | |
54aa1f4d | 464 | err: |
e37c9e69 | 465 | btrfs_free_path(path); |
276e680d | 466 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 467 | |
11833d66 YZ |
468 | free_excluded_extents(extent_root, block_group); |
469 | ||
470 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 471 | out: |
11833d66 YZ |
472 | wake_up(&caching_ctl->wait); |
473 | ||
474 | put_caching_control(caching_ctl); | |
11dfe35a | 475 | btrfs_put_block_group(block_group); |
817d52f8 JB |
476 | } |
477 | ||
9d66e233 | 478 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 479 | int load_cache_only) |
817d52f8 | 480 | { |
291c7d2f | 481 | DEFINE_WAIT(wait); |
11833d66 YZ |
482 | struct btrfs_fs_info *fs_info = cache->fs_info; |
483 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
484 | int ret = 0; |
485 | ||
291c7d2f | 486 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
487 | if (!caching_ctl) |
488 | return -ENOMEM; | |
291c7d2f JB |
489 | |
490 | INIT_LIST_HEAD(&caching_ctl->list); | |
491 | mutex_init(&caching_ctl->mutex); | |
492 | init_waitqueue_head(&caching_ctl->wait); | |
493 | caching_ctl->block_group = cache; | |
494 | caching_ctl->progress = cache->key.objectid; | |
495 | atomic_set(&caching_ctl->count, 1); | |
496 | caching_ctl->work.func = caching_thread; | |
497 | ||
498 | spin_lock(&cache->lock); | |
499 | /* | |
500 | * This should be a rare occasion, but this could happen I think in the | |
501 | * case where one thread starts to load the space cache info, and then | |
502 | * some other thread starts a transaction commit which tries to do an | |
503 | * allocation while the other thread is still loading the space cache | |
504 | * info. The previous loop should have kept us from choosing this block | |
505 | * group, but if we've moved to the state where we will wait on caching | |
506 | * block groups we need to first check if we're doing a fast load here, | |
507 | * so we can wait for it to finish, otherwise we could end up allocating | |
508 | * from a block group who's cache gets evicted for one reason or | |
509 | * another. | |
510 | */ | |
511 | while (cache->cached == BTRFS_CACHE_FAST) { | |
512 | struct btrfs_caching_control *ctl; | |
513 | ||
514 | ctl = cache->caching_ctl; | |
515 | atomic_inc(&ctl->count); | |
516 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
517 | spin_unlock(&cache->lock); | |
518 | ||
519 | schedule(); | |
520 | ||
521 | finish_wait(&ctl->wait, &wait); | |
522 | put_caching_control(ctl); | |
523 | spin_lock(&cache->lock); | |
524 | } | |
525 | ||
526 | if (cache->cached != BTRFS_CACHE_NO) { | |
527 | spin_unlock(&cache->lock); | |
528 | kfree(caching_ctl); | |
11833d66 | 529 | return 0; |
291c7d2f JB |
530 | } |
531 | WARN_ON(cache->caching_ctl); | |
532 | cache->caching_ctl = caching_ctl; | |
533 | cache->cached = BTRFS_CACHE_FAST; | |
534 | spin_unlock(&cache->lock); | |
11833d66 | 535 | |
d53ba474 | 536 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
537 | ret = load_free_space_cache(fs_info, cache); |
538 | ||
539 | spin_lock(&cache->lock); | |
540 | if (ret == 1) { | |
291c7d2f | 541 | cache->caching_ctl = NULL; |
9d66e233 JB |
542 | cache->cached = BTRFS_CACHE_FINISHED; |
543 | cache->last_byte_to_unpin = (u64)-1; | |
544 | } else { | |
291c7d2f JB |
545 | if (load_cache_only) { |
546 | cache->caching_ctl = NULL; | |
547 | cache->cached = BTRFS_CACHE_NO; | |
548 | } else { | |
549 | cache->cached = BTRFS_CACHE_STARTED; | |
550 | } | |
9d66e233 JB |
551 | } |
552 | spin_unlock(&cache->lock); | |
291c7d2f | 553 | wake_up(&caching_ctl->wait); |
3c14874a | 554 | if (ret == 1) { |
291c7d2f | 555 | put_caching_control(caching_ctl); |
3c14874a | 556 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 557 | return 0; |
3c14874a | 558 | } |
291c7d2f JB |
559 | } else { |
560 | /* | |
561 | * We are not going to do the fast caching, set cached to the | |
562 | * appropriate value and wakeup any waiters. | |
563 | */ | |
564 | spin_lock(&cache->lock); | |
565 | if (load_cache_only) { | |
566 | cache->caching_ctl = NULL; | |
567 | cache->cached = BTRFS_CACHE_NO; | |
568 | } else { | |
569 | cache->cached = BTRFS_CACHE_STARTED; | |
570 | } | |
571 | spin_unlock(&cache->lock); | |
572 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
573 | } |
574 | ||
291c7d2f JB |
575 | if (load_cache_only) { |
576 | put_caching_control(caching_ctl); | |
11833d66 | 577 | return 0; |
817d52f8 | 578 | } |
817d52f8 | 579 | |
11833d66 | 580 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 581 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
582 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
583 | up_write(&fs_info->extent_commit_sem); | |
584 | ||
11dfe35a | 585 | btrfs_get_block_group(cache); |
11833d66 | 586 | |
bab39bf9 | 587 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 588 | |
ef8bbdfe | 589 | return ret; |
e37c9e69 CM |
590 | } |
591 | ||
0f9dd46c JB |
592 | /* |
593 | * return the block group that starts at or after bytenr | |
594 | */ | |
d397712b CM |
595 | static struct btrfs_block_group_cache * |
596 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 597 | { |
0f9dd46c | 598 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 599 | |
0f9dd46c | 600 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 601 | |
0f9dd46c | 602 | return cache; |
0ef3e66b CM |
603 | } |
604 | ||
0f9dd46c | 605 | /* |
9f55684c | 606 | * return the block group that contains the given bytenr |
0f9dd46c | 607 | */ |
d397712b CM |
608 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
609 | struct btrfs_fs_info *info, | |
610 | u64 bytenr) | |
be744175 | 611 | { |
0f9dd46c | 612 | struct btrfs_block_group_cache *cache; |
be744175 | 613 | |
0f9dd46c | 614 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 615 | |
0f9dd46c | 616 | return cache; |
be744175 | 617 | } |
0b86a832 | 618 | |
0f9dd46c JB |
619 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
620 | u64 flags) | |
6324fbf3 | 621 | { |
0f9dd46c | 622 | struct list_head *head = &info->space_info; |
0f9dd46c | 623 | struct btrfs_space_info *found; |
4184ea7f | 624 | |
52ba6929 | 625 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 626 | |
4184ea7f CM |
627 | rcu_read_lock(); |
628 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 629 | if (found->flags & flags) { |
4184ea7f | 630 | rcu_read_unlock(); |
0f9dd46c | 631 | return found; |
4184ea7f | 632 | } |
0f9dd46c | 633 | } |
4184ea7f | 634 | rcu_read_unlock(); |
0f9dd46c | 635 | return NULL; |
6324fbf3 CM |
636 | } |
637 | ||
4184ea7f CM |
638 | /* |
639 | * after adding space to the filesystem, we need to clear the full flags | |
640 | * on all the space infos. | |
641 | */ | |
642 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
643 | { | |
644 | struct list_head *head = &info->space_info; | |
645 | struct btrfs_space_info *found; | |
646 | ||
647 | rcu_read_lock(); | |
648 | list_for_each_entry_rcu(found, head, list) | |
649 | found->full = 0; | |
650 | rcu_read_unlock(); | |
651 | } | |
652 | ||
d2fb3437 YZ |
653 | u64 btrfs_find_block_group(struct btrfs_root *root, |
654 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 655 | { |
96b5179d | 656 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 657 | u64 used; |
d2fb3437 YZ |
658 | u64 last = max(search_hint, search_start); |
659 | u64 group_start = 0; | |
31f3c99b | 660 | int full_search = 0; |
d2fb3437 | 661 | int factor = 9; |
0ef3e66b | 662 | int wrapped = 0; |
31f3c99b | 663 | again: |
e8569813 ZY |
664 | while (1) { |
665 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
666 | if (!cache) |
667 | break; | |
96b5179d | 668 | |
c286ac48 | 669 | spin_lock(&cache->lock); |
96b5179d CM |
670 | last = cache->key.objectid + cache->key.offset; |
671 | used = btrfs_block_group_used(&cache->item); | |
672 | ||
d2fb3437 YZ |
673 | if ((full_search || !cache->ro) && |
674 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 675 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
676 | div_factor(cache->key.offset, factor)) { |
677 | group_start = cache->key.objectid; | |
c286ac48 | 678 | spin_unlock(&cache->lock); |
fa9c0d79 | 679 | btrfs_put_block_group(cache); |
8790d502 CM |
680 | goto found; |
681 | } | |
6324fbf3 | 682 | } |
c286ac48 | 683 | spin_unlock(&cache->lock); |
fa9c0d79 | 684 | btrfs_put_block_group(cache); |
de428b63 | 685 | cond_resched(); |
cd1bc465 | 686 | } |
0ef3e66b CM |
687 | if (!wrapped) { |
688 | last = search_start; | |
689 | wrapped = 1; | |
690 | goto again; | |
691 | } | |
692 | if (!full_search && factor < 10) { | |
be744175 | 693 | last = search_start; |
31f3c99b | 694 | full_search = 1; |
0ef3e66b | 695 | factor = 10; |
31f3c99b CM |
696 | goto again; |
697 | } | |
be744175 | 698 | found: |
d2fb3437 | 699 | return group_start; |
925baedd | 700 | } |
0f9dd46c | 701 | |
e02119d5 | 702 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 703 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
704 | { |
705 | int ret; | |
706 | struct btrfs_key key; | |
31840ae1 | 707 | struct btrfs_path *path; |
e02119d5 | 708 | |
31840ae1 | 709 | path = btrfs_alloc_path(); |
d8926bb3 MF |
710 | if (!path) |
711 | return -ENOMEM; | |
712 | ||
e02119d5 CM |
713 | key.objectid = start; |
714 | key.offset = len; | |
715 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
716 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
717 | 0, 0); | |
31840ae1 | 718 | btrfs_free_path(path); |
7bb86316 CM |
719 | return ret; |
720 | } | |
721 | ||
a22285a6 YZ |
722 | /* |
723 | * helper function to lookup reference count and flags of extent. | |
724 | * | |
725 | * the head node for delayed ref is used to store the sum of all the | |
726 | * reference count modifications queued up in the rbtree. the head | |
727 | * node may also store the extent flags to set. This way you can check | |
728 | * to see what the reference count and extent flags would be if all of | |
729 | * the delayed refs are not processed. | |
730 | */ | |
731 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
732 | struct btrfs_root *root, u64 bytenr, | |
733 | u64 num_bytes, u64 *refs, u64 *flags) | |
734 | { | |
735 | struct btrfs_delayed_ref_head *head; | |
736 | struct btrfs_delayed_ref_root *delayed_refs; | |
737 | struct btrfs_path *path; | |
738 | struct btrfs_extent_item *ei; | |
739 | struct extent_buffer *leaf; | |
740 | struct btrfs_key key; | |
741 | u32 item_size; | |
742 | u64 num_refs; | |
743 | u64 extent_flags; | |
744 | int ret; | |
745 | ||
746 | path = btrfs_alloc_path(); | |
747 | if (!path) | |
748 | return -ENOMEM; | |
749 | ||
750 | key.objectid = bytenr; | |
751 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
752 | key.offset = num_bytes; | |
753 | if (!trans) { | |
754 | path->skip_locking = 1; | |
755 | path->search_commit_root = 1; | |
756 | } | |
757 | again: | |
758 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
759 | &key, path, 0, 0); | |
760 | if (ret < 0) | |
761 | goto out_free; | |
762 | ||
763 | if (ret == 0) { | |
764 | leaf = path->nodes[0]; | |
765 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
766 | if (item_size >= sizeof(*ei)) { | |
767 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
768 | struct btrfs_extent_item); | |
769 | num_refs = btrfs_extent_refs(leaf, ei); | |
770 | extent_flags = btrfs_extent_flags(leaf, ei); | |
771 | } else { | |
772 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
773 | struct btrfs_extent_item_v0 *ei0; | |
774 | BUG_ON(item_size != sizeof(*ei0)); | |
775 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
776 | struct btrfs_extent_item_v0); | |
777 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
778 | /* FIXME: this isn't correct for data */ | |
779 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
780 | #else | |
781 | BUG(); | |
782 | #endif | |
783 | } | |
784 | BUG_ON(num_refs == 0); | |
785 | } else { | |
786 | num_refs = 0; | |
787 | extent_flags = 0; | |
788 | ret = 0; | |
789 | } | |
790 | ||
791 | if (!trans) | |
792 | goto out; | |
793 | ||
794 | delayed_refs = &trans->transaction->delayed_refs; | |
795 | spin_lock(&delayed_refs->lock); | |
796 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
797 | if (head) { | |
798 | if (!mutex_trylock(&head->mutex)) { | |
799 | atomic_inc(&head->node.refs); | |
800 | spin_unlock(&delayed_refs->lock); | |
801 | ||
b3b4aa74 | 802 | btrfs_release_path(path); |
a22285a6 | 803 | |
8cc33e5c DS |
804 | /* |
805 | * Mutex was contended, block until it's released and try | |
806 | * again | |
807 | */ | |
a22285a6 YZ |
808 | mutex_lock(&head->mutex); |
809 | mutex_unlock(&head->mutex); | |
810 | btrfs_put_delayed_ref(&head->node); | |
811 | goto again; | |
812 | } | |
813 | if (head->extent_op && head->extent_op->update_flags) | |
814 | extent_flags |= head->extent_op->flags_to_set; | |
815 | else | |
816 | BUG_ON(num_refs == 0); | |
817 | ||
818 | num_refs += head->node.ref_mod; | |
819 | mutex_unlock(&head->mutex); | |
820 | } | |
821 | spin_unlock(&delayed_refs->lock); | |
822 | out: | |
823 | WARN_ON(num_refs == 0); | |
824 | if (refs) | |
825 | *refs = num_refs; | |
826 | if (flags) | |
827 | *flags = extent_flags; | |
828 | out_free: | |
829 | btrfs_free_path(path); | |
830 | return ret; | |
831 | } | |
832 | ||
d8d5f3e1 CM |
833 | /* |
834 | * Back reference rules. Back refs have three main goals: | |
835 | * | |
836 | * 1) differentiate between all holders of references to an extent so that | |
837 | * when a reference is dropped we can make sure it was a valid reference | |
838 | * before freeing the extent. | |
839 | * | |
840 | * 2) Provide enough information to quickly find the holders of an extent | |
841 | * if we notice a given block is corrupted or bad. | |
842 | * | |
843 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
844 | * maintenance. This is actually the same as #2, but with a slightly | |
845 | * different use case. | |
846 | * | |
5d4f98a2 YZ |
847 | * There are two kinds of back refs. The implicit back refs is optimized |
848 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
849 | * back refs of this kind provide information about the block's owner tree | |
850 | * and the pointer's key. These information allow us to find the block by | |
851 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
852 | * referenced by their owner trees. The location of tree block is recorded | |
853 | * in the back refs. Actually the full back refs is generic, and can be | |
854 | * used in all cases the implicit back refs is used. The major shortcoming | |
855 | * of the full back refs is its overhead. Every time a tree block gets | |
856 | * COWed, we have to update back refs entry for all pointers in it. | |
857 | * | |
858 | * For a newly allocated tree block, we use implicit back refs for | |
859 | * pointers in it. This means most tree related operations only involve | |
860 | * implicit back refs. For a tree block created in old transaction, the | |
861 | * only way to drop a reference to it is COW it. So we can detect the | |
862 | * event that tree block loses its owner tree's reference and do the | |
863 | * back refs conversion. | |
864 | * | |
865 | * When a tree block is COW'd through a tree, there are four cases: | |
866 | * | |
867 | * The reference count of the block is one and the tree is the block's | |
868 | * owner tree. Nothing to do in this case. | |
869 | * | |
870 | * The reference count of the block is one and the tree is not the | |
871 | * block's owner tree. In this case, full back refs is used for pointers | |
872 | * in the block. Remove these full back refs, add implicit back refs for | |
873 | * every pointers in the new block. | |
874 | * | |
875 | * The reference count of the block is greater than one and the tree is | |
876 | * the block's owner tree. In this case, implicit back refs is used for | |
877 | * pointers in the block. Add full back refs for every pointers in the | |
878 | * block, increase lower level extents' reference counts. The original | |
879 | * implicit back refs are entailed to the new block. | |
880 | * | |
881 | * The reference count of the block is greater than one and the tree is | |
882 | * not the block's owner tree. Add implicit back refs for every pointer in | |
883 | * the new block, increase lower level extents' reference count. | |
884 | * | |
885 | * Back Reference Key composing: | |
886 | * | |
887 | * The key objectid corresponds to the first byte in the extent, | |
888 | * The key type is used to differentiate between types of back refs. | |
889 | * There are different meanings of the key offset for different types | |
890 | * of back refs. | |
891 | * | |
d8d5f3e1 CM |
892 | * File extents can be referenced by: |
893 | * | |
894 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 895 | * - different files inside a single subvolume |
d8d5f3e1 CM |
896 | * - different offsets inside a file (bookend extents in file.c) |
897 | * | |
5d4f98a2 | 898 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
899 | * |
900 | * - Objectid of the subvolume root | |
d8d5f3e1 | 901 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
902 | * - original offset in the file |
903 | * - how many bookend extents | |
d8d5f3e1 | 904 | * |
5d4f98a2 YZ |
905 | * The key offset for the implicit back refs is hash of the first |
906 | * three fields. | |
d8d5f3e1 | 907 | * |
5d4f98a2 | 908 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 909 | * |
5d4f98a2 | 910 | * - number of pointers in the tree leaf |
d8d5f3e1 | 911 | * |
5d4f98a2 YZ |
912 | * The key offset for the implicit back refs is the first byte of |
913 | * the tree leaf | |
d8d5f3e1 | 914 | * |
5d4f98a2 YZ |
915 | * When a file extent is allocated, The implicit back refs is used. |
916 | * the fields are filled in: | |
d8d5f3e1 | 917 | * |
5d4f98a2 | 918 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 919 | * |
5d4f98a2 YZ |
920 | * When a file extent is removed file truncation, we find the |
921 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 922 | * |
5d4f98a2 | 923 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 924 | * |
5d4f98a2 | 925 | * Btree extents can be referenced by: |
d8d5f3e1 | 926 | * |
5d4f98a2 | 927 | * - Different subvolumes |
d8d5f3e1 | 928 | * |
5d4f98a2 YZ |
929 | * Both the implicit back refs and the full back refs for tree blocks |
930 | * only consist of key. The key offset for the implicit back refs is | |
931 | * objectid of block's owner tree. The key offset for the full back refs | |
932 | * is the first byte of parent block. | |
d8d5f3e1 | 933 | * |
5d4f98a2 YZ |
934 | * When implicit back refs is used, information about the lowest key and |
935 | * level of the tree block are required. These information are stored in | |
936 | * tree block info structure. | |
d8d5f3e1 | 937 | */ |
31840ae1 | 938 | |
5d4f98a2 YZ |
939 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
940 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
941 | struct btrfs_root *root, | |
942 | struct btrfs_path *path, | |
943 | u64 owner, u32 extra_size) | |
7bb86316 | 944 | { |
5d4f98a2 YZ |
945 | struct btrfs_extent_item *item; |
946 | struct btrfs_extent_item_v0 *ei0; | |
947 | struct btrfs_extent_ref_v0 *ref0; | |
948 | struct btrfs_tree_block_info *bi; | |
949 | struct extent_buffer *leaf; | |
7bb86316 | 950 | struct btrfs_key key; |
5d4f98a2 YZ |
951 | struct btrfs_key found_key; |
952 | u32 new_size = sizeof(*item); | |
953 | u64 refs; | |
954 | int ret; | |
955 | ||
956 | leaf = path->nodes[0]; | |
957 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
958 | ||
959 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
960 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
961 | struct btrfs_extent_item_v0); | |
962 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
963 | ||
964 | if (owner == (u64)-1) { | |
965 | while (1) { | |
966 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
967 | ret = btrfs_next_leaf(root, path); | |
968 | if (ret < 0) | |
969 | return ret; | |
79787eaa | 970 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
971 | leaf = path->nodes[0]; |
972 | } | |
973 | btrfs_item_key_to_cpu(leaf, &found_key, | |
974 | path->slots[0]); | |
975 | BUG_ON(key.objectid != found_key.objectid); | |
976 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
977 | path->slots[0]++; | |
978 | continue; | |
979 | } | |
980 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
981 | struct btrfs_extent_ref_v0); | |
982 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
983 | break; | |
984 | } | |
985 | } | |
b3b4aa74 | 986 | btrfs_release_path(path); |
5d4f98a2 YZ |
987 | |
988 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
989 | new_size += sizeof(*bi); | |
990 | ||
991 | new_size -= sizeof(*ei0); | |
992 | ret = btrfs_search_slot(trans, root, &key, path, | |
993 | new_size + extra_size, 1); | |
994 | if (ret < 0) | |
995 | return ret; | |
79787eaa | 996 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 997 | |
143bede5 | 998 | btrfs_extend_item(trans, root, path, new_size); |
5d4f98a2 YZ |
999 | |
1000 | leaf = path->nodes[0]; | |
1001 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1002 | btrfs_set_extent_refs(leaf, item, refs); | |
1003 | /* FIXME: get real generation */ | |
1004 | btrfs_set_extent_generation(leaf, item, 0); | |
1005 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1006 | btrfs_set_extent_flags(leaf, item, | |
1007 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1008 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1009 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1010 | /* FIXME: get first key of the block */ | |
1011 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1012 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1013 | } else { | |
1014 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1015 | } | |
1016 | btrfs_mark_buffer_dirty(leaf); | |
1017 | return 0; | |
1018 | } | |
1019 | #endif | |
1020 | ||
1021 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1022 | { | |
1023 | u32 high_crc = ~(u32)0; | |
1024 | u32 low_crc = ~(u32)0; | |
1025 | __le64 lenum; | |
1026 | ||
1027 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1028 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1029 | lenum = cpu_to_le64(owner); |
163e783e | 1030 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1031 | lenum = cpu_to_le64(offset); |
163e783e | 1032 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1033 | |
1034 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1035 | } | |
1036 | ||
1037 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1038 | struct btrfs_extent_data_ref *ref) | |
1039 | { | |
1040 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1041 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1042 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1043 | } | |
1044 | ||
1045 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1046 | struct btrfs_extent_data_ref *ref, | |
1047 | u64 root_objectid, u64 owner, u64 offset) | |
1048 | { | |
1049 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1050 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1051 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1052 | return 0; | |
1053 | return 1; | |
1054 | } | |
1055 | ||
1056 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1057 | struct btrfs_root *root, | |
1058 | struct btrfs_path *path, | |
1059 | u64 bytenr, u64 parent, | |
1060 | u64 root_objectid, | |
1061 | u64 owner, u64 offset) | |
1062 | { | |
1063 | struct btrfs_key key; | |
1064 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1065 | struct extent_buffer *leaf; |
5d4f98a2 | 1066 | u32 nritems; |
74493f7a | 1067 | int ret; |
5d4f98a2 YZ |
1068 | int recow; |
1069 | int err = -ENOENT; | |
74493f7a | 1070 | |
31840ae1 | 1071 | key.objectid = bytenr; |
5d4f98a2 YZ |
1072 | if (parent) { |
1073 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1074 | key.offset = parent; | |
1075 | } else { | |
1076 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1077 | key.offset = hash_extent_data_ref(root_objectid, | |
1078 | owner, offset); | |
1079 | } | |
1080 | again: | |
1081 | recow = 0; | |
1082 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1083 | if (ret < 0) { | |
1084 | err = ret; | |
1085 | goto fail; | |
1086 | } | |
31840ae1 | 1087 | |
5d4f98a2 YZ |
1088 | if (parent) { |
1089 | if (!ret) | |
1090 | return 0; | |
1091 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1092 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1093 | btrfs_release_path(path); |
5d4f98a2 YZ |
1094 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1095 | if (ret < 0) { | |
1096 | err = ret; | |
1097 | goto fail; | |
1098 | } | |
1099 | if (!ret) | |
1100 | return 0; | |
1101 | #endif | |
1102 | goto fail; | |
31840ae1 ZY |
1103 | } |
1104 | ||
1105 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1106 | nritems = btrfs_header_nritems(leaf); |
1107 | while (1) { | |
1108 | if (path->slots[0] >= nritems) { | |
1109 | ret = btrfs_next_leaf(root, path); | |
1110 | if (ret < 0) | |
1111 | err = ret; | |
1112 | if (ret) | |
1113 | goto fail; | |
1114 | ||
1115 | leaf = path->nodes[0]; | |
1116 | nritems = btrfs_header_nritems(leaf); | |
1117 | recow = 1; | |
1118 | } | |
1119 | ||
1120 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1121 | if (key.objectid != bytenr || | |
1122 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1123 | goto fail; | |
1124 | ||
1125 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1126 | struct btrfs_extent_data_ref); | |
1127 | ||
1128 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1129 | owner, offset)) { | |
1130 | if (recow) { | |
b3b4aa74 | 1131 | btrfs_release_path(path); |
5d4f98a2 YZ |
1132 | goto again; |
1133 | } | |
1134 | err = 0; | |
1135 | break; | |
1136 | } | |
1137 | path->slots[0]++; | |
31840ae1 | 1138 | } |
5d4f98a2 YZ |
1139 | fail: |
1140 | return err; | |
31840ae1 ZY |
1141 | } |
1142 | ||
5d4f98a2 YZ |
1143 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1144 | struct btrfs_root *root, | |
1145 | struct btrfs_path *path, | |
1146 | u64 bytenr, u64 parent, | |
1147 | u64 root_objectid, u64 owner, | |
1148 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1149 | { |
1150 | struct btrfs_key key; | |
1151 | struct extent_buffer *leaf; | |
5d4f98a2 | 1152 | u32 size; |
31840ae1 ZY |
1153 | u32 num_refs; |
1154 | int ret; | |
74493f7a | 1155 | |
74493f7a | 1156 | key.objectid = bytenr; |
5d4f98a2 YZ |
1157 | if (parent) { |
1158 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1159 | key.offset = parent; | |
1160 | size = sizeof(struct btrfs_shared_data_ref); | |
1161 | } else { | |
1162 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1163 | key.offset = hash_extent_data_ref(root_objectid, | |
1164 | owner, offset); | |
1165 | size = sizeof(struct btrfs_extent_data_ref); | |
1166 | } | |
74493f7a | 1167 | |
5d4f98a2 YZ |
1168 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1169 | if (ret && ret != -EEXIST) | |
1170 | goto fail; | |
1171 | ||
1172 | leaf = path->nodes[0]; | |
1173 | if (parent) { | |
1174 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1175 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1176 | struct btrfs_shared_data_ref); |
1177 | if (ret == 0) { | |
1178 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1179 | } else { | |
1180 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1181 | num_refs += refs_to_add; | |
1182 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1183 | } |
5d4f98a2 YZ |
1184 | } else { |
1185 | struct btrfs_extent_data_ref *ref; | |
1186 | while (ret == -EEXIST) { | |
1187 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1188 | struct btrfs_extent_data_ref); | |
1189 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1190 | owner, offset)) | |
1191 | break; | |
b3b4aa74 | 1192 | btrfs_release_path(path); |
5d4f98a2 YZ |
1193 | key.offset++; |
1194 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1195 | size); | |
1196 | if (ret && ret != -EEXIST) | |
1197 | goto fail; | |
31840ae1 | 1198 | |
5d4f98a2 YZ |
1199 | leaf = path->nodes[0]; |
1200 | } | |
1201 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1202 | struct btrfs_extent_data_ref); | |
1203 | if (ret == 0) { | |
1204 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1205 | root_objectid); | |
1206 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1207 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1208 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1209 | } else { | |
1210 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1211 | num_refs += refs_to_add; | |
1212 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1213 | } |
31840ae1 | 1214 | } |
5d4f98a2 YZ |
1215 | btrfs_mark_buffer_dirty(leaf); |
1216 | ret = 0; | |
1217 | fail: | |
b3b4aa74 | 1218 | btrfs_release_path(path); |
7bb86316 | 1219 | return ret; |
74493f7a CM |
1220 | } |
1221 | ||
5d4f98a2 YZ |
1222 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1223 | struct btrfs_root *root, | |
1224 | struct btrfs_path *path, | |
1225 | int refs_to_drop) | |
31840ae1 | 1226 | { |
5d4f98a2 YZ |
1227 | struct btrfs_key key; |
1228 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1229 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1230 | struct extent_buffer *leaf; |
5d4f98a2 | 1231 | u32 num_refs = 0; |
31840ae1 ZY |
1232 | int ret = 0; |
1233 | ||
1234 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1235 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1236 | ||
1237 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1238 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1239 | struct btrfs_extent_data_ref); | |
1240 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1241 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1242 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1243 | struct btrfs_shared_data_ref); | |
1244 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1245 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1246 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1247 | struct btrfs_extent_ref_v0 *ref0; | |
1248 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1249 | struct btrfs_extent_ref_v0); | |
1250 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1251 | #endif | |
1252 | } else { | |
1253 | BUG(); | |
1254 | } | |
1255 | ||
56bec294 CM |
1256 | BUG_ON(num_refs < refs_to_drop); |
1257 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1258 | |
31840ae1 ZY |
1259 | if (num_refs == 0) { |
1260 | ret = btrfs_del_item(trans, root, path); | |
1261 | } else { | |
5d4f98a2 YZ |
1262 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1263 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1264 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1265 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1266 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1267 | else { | |
1268 | struct btrfs_extent_ref_v0 *ref0; | |
1269 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1270 | struct btrfs_extent_ref_v0); | |
1271 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1272 | } | |
1273 | #endif | |
31840ae1 ZY |
1274 | btrfs_mark_buffer_dirty(leaf); |
1275 | } | |
31840ae1 ZY |
1276 | return ret; |
1277 | } | |
1278 | ||
5d4f98a2 YZ |
1279 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1280 | struct btrfs_path *path, | |
1281 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1282 | { |
5d4f98a2 YZ |
1283 | struct btrfs_key key; |
1284 | struct extent_buffer *leaf; | |
1285 | struct btrfs_extent_data_ref *ref1; | |
1286 | struct btrfs_shared_data_ref *ref2; | |
1287 | u32 num_refs = 0; | |
1288 | ||
1289 | leaf = path->nodes[0]; | |
1290 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1291 | if (iref) { | |
1292 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1293 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1294 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1295 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1296 | } else { | |
1297 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1298 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1299 | } | |
1300 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1301 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1302 | struct btrfs_extent_data_ref); | |
1303 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1304 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1305 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1306 | struct btrfs_shared_data_ref); | |
1307 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1308 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1309 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1310 | struct btrfs_extent_ref_v0 *ref0; | |
1311 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1312 | struct btrfs_extent_ref_v0); | |
1313 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1314 | #endif |
5d4f98a2 YZ |
1315 | } else { |
1316 | WARN_ON(1); | |
1317 | } | |
1318 | return num_refs; | |
1319 | } | |
15916de8 | 1320 | |
5d4f98a2 YZ |
1321 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1322 | struct btrfs_root *root, | |
1323 | struct btrfs_path *path, | |
1324 | u64 bytenr, u64 parent, | |
1325 | u64 root_objectid) | |
1f3c79a2 | 1326 | { |
5d4f98a2 | 1327 | struct btrfs_key key; |
1f3c79a2 | 1328 | int ret; |
1f3c79a2 | 1329 | |
5d4f98a2 YZ |
1330 | key.objectid = bytenr; |
1331 | if (parent) { | |
1332 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1333 | key.offset = parent; | |
1334 | } else { | |
1335 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1336 | key.offset = root_objectid; | |
1f3c79a2 LH |
1337 | } |
1338 | ||
5d4f98a2 YZ |
1339 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1340 | if (ret > 0) | |
1341 | ret = -ENOENT; | |
1342 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1343 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1344 | btrfs_release_path(path); |
5d4f98a2 YZ |
1345 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1346 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1347 | if (ret > 0) | |
1348 | ret = -ENOENT; | |
1349 | } | |
1f3c79a2 | 1350 | #endif |
5d4f98a2 | 1351 | return ret; |
1f3c79a2 LH |
1352 | } |
1353 | ||
5d4f98a2 YZ |
1354 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1355 | struct btrfs_root *root, | |
1356 | struct btrfs_path *path, | |
1357 | u64 bytenr, u64 parent, | |
1358 | u64 root_objectid) | |
31840ae1 | 1359 | { |
5d4f98a2 | 1360 | struct btrfs_key key; |
31840ae1 | 1361 | int ret; |
31840ae1 | 1362 | |
5d4f98a2 YZ |
1363 | key.objectid = bytenr; |
1364 | if (parent) { | |
1365 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1366 | key.offset = parent; | |
1367 | } else { | |
1368 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1369 | key.offset = root_objectid; | |
1370 | } | |
1371 | ||
1372 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1373 | btrfs_release_path(path); |
31840ae1 ZY |
1374 | return ret; |
1375 | } | |
1376 | ||
5d4f98a2 | 1377 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1378 | { |
5d4f98a2 YZ |
1379 | int type; |
1380 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1381 | if (parent > 0) | |
1382 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1383 | else | |
1384 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1385 | } else { | |
1386 | if (parent > 0) | |
1387 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1388 | else | |
1389 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1390 | } | |
1391 | return type; | |
31840ae1 | 1392 | } |
56bec294 | 1393 | |
2c47e605 YZ |
1394 | static int find_next_key(struct btrfs_path *path, int level, |
1395 | struct btrfs_key *key) | |
56bec294 | 1396 | |
02217ed2 | 1397 | { |
2c47e605 | 1398 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1399 | if (!path->nodes[level]) |
1400 | break; | |
5d4f98a2 YZ |
1401 | if (path->slots[level] + 1 >= |
1402 | btrfs_header_nritems(path->nodes[level])) | |
1403 | continue; | |
1404 | if (level == 0) | |
1405 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1406 | path->slots[level] + 1); | |
1407 | else | |
1408 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1409 | path->slots[level] + 1); | |
1410 | return 0; | |
1411 | } | |
1412 | return 1; | |
1413 | } | |
037e6390 | 1414 | |
5d4f98a2 YZ |
1415 | /* |
1416 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1417 | * to the address of inline back ref, and 0 is returned. | |
1418 | * | |
1419 | * if back ref isn't found, *ref_ret is set to the address where it | |
1420 | * should be inserted, and -ENOENT is returned. | |
1421 | * | |
1422 | * if insert is true and there are too many inline back refs, the path | |
1423 | * points to the extent item, and -EAGAIN is returned. | |
1424 | * | |
1425 | * NOTE: inline back refs are ordered in the same way that back ref | |
1426 | * items in the tree are ordered. | |
1427 | */ | |
1428 | static noinline_for_stack | |
1429 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1430 | struct btrfs_root *root, | |
1431 | struct btrfs_path *path, | |
1432 | struct btrfs_extent_inline_ref **ref_ret, | |
1433 | u64 bytenr, u64 num_bytes, | |
1434 | u64 parent, u64 root_objectid, | |
1435 | u64 owner, u64 offset, int insert) | |
1436 | { | |
1437 | struct btrfs_key key; | |
1438 | struct extent_buffer *leaf; | |
1439 | struct btrfs_extent_item *ei; | |
1440 | struct btrfs_extent_inline_ref *iref; | |
1441 | u64 flags; | |
1442 | u64 item_size; | |
1443 | unsigned long ptr; | |
1444 | unsigned long end; | |
1445 | int extra_size; | |
1446 | int type; | |
1447 | int want; | |
1448 | int ret; | |
1449 | int err = 0; | |
26b8003f | 1450 | |
db94535d | 1451 | key.objectid = bytenr; |
31840ae1 | 1452 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1453 | key.offset = num_bytes; |
31840ae1 | 1454 | |
5d4f98a2 YZ |
1455 | want = extent_ref_type(parent, owner); |
1456 | if (insert) { | |
1457 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1458 | path->keep_locks = 1; |
5d4f98a2 YZ |
1459 | } else |
1460 | extra_size = -1; | |
1461 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1462 | if (ret < 0) { |
5d4f98a2 YZ |
1463 | err = ret; |
1464 | goto out; | |
1465 | } | |
79787eaa JM |
1466 | if (ret && !insert) { |
1467 | err = -ENOENT; | |
1468 | goto out; | |
1469 | } | |
1470 | BUG_ON(ret); /* Corruption */ | |
5d4f98a2 YZ |
1471 | |
1472 | leaf = path->nodes[0]; | |
1473 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1474 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1475 | if (item_size < sizeof(*ei)) { | |
1476 | if (!insert) { | |
1477 | err = -ENOENT; | |
1478 | goto out; | |
1479 | } | |
1480 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1481 | extra_size); | |
1482 | if (ret < 0) { | |
1483 | err = ret; | |
1484 | goto out; | |
1485 | } | |
1486 | leaf = path->nodes[0]; | |
1487 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1488 | } | |
1489 | #endif | |
1490 | BUG_ON(item_size < sizeof(*ei)); | |
1491 | ||
5d4f98a2 YZ |
1492 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1493 | flags = btrfs_extent_flags(leaf, ei); | |
1494 | ||
1495 | ptr = (unsigned long)(ei + 1); | |
1496 | end = (unsigned long)ei + item_size; | |
1497 | ||
1498 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1499 | ptr += sizeof(struct btrfs_tree_block_info); | |
1500 | BUG_ON(ptr > end); | |
1501 | } else { | |
1502 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1503 | } | |
1504 | ||
1505 | err = -ENOENT; | |
1506 | while (1) { | |
1507 | if (ptr >= end) { | |
1508 | WARN_ON(ptr > end); | |
1509 | break; | |
1510 | } | |
1511 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1512 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1513 | if (want < type) | |
1514 | break; | |
1515 | if (want > type) { | |
1516 | ptr += btrfs_extent_inline_ref_size(type); | |
1517 | continue; | |
1518 | } | |
1519 | ||
1520 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1521 | struct btrfs_extent_data_ref *dref; | |
1522 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1523 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1524 | owner, offset)) { | |
1525 | err = 0; | |
1526 | break; | |
1527 | } | |
1528 | if (hash_extent_data_ref_item(leaf, dref) < | |
1529 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1530 | break; | |
1531 | } else { | |
1532 | u64 ref_offset; | |
1533 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1534 | if (parent > 0) { | |
1535 | if (parent == ref_offset) { | |
1536 | err = 0; | |
1537 | break; | |
1538 | } | |
1539 | if (ref_offset < parent) | |
1540 | break; | |
1541 | } else { | |
1542 | if (root_objectid == ref_offset) { | |
1543 | err = 0; | |
1544 | break; | |
1545 | } | |
1546 | if (ref_offset < root_objectid) | |
1547 | break; | |
1548 | } | |
1549 | } | |
1550 | ptr += btrfs_extent_inline_ref_size(type); | |
1551 | } | |
1552 | if (err == -ENOENT && insert) { | |
1553 | if (item_size + extra_size >= | |
1554 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1555 | err = -EAGAIN; | |
1556 | goto out; | |
1557 | } | |
1558 | /* | |
1559 | * To add new inline back ref, we have to make sure | |
1560 | * there is no corresponding back ref item. | |
1561 | * For simplicity, we just do not add new inline back | |
1562 | * ref if there is any kind of item for this block | |
1563 | */ | |
2c47e605 YZ |
1564 | if (find_next_key(path, 0, &key) == 0 && |
1565 | key.objectid == bytenr && | |
85d4198e | 1566 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1567 | err = -EAGAIN; |
1568 | goto out; | |
1569 | } | |
1570 | } | |
1571 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1572 | out: | |
85d4198e | 1573 | if (insert) { |
5d4f98a2 YZ |
1574 | path->keep_locks = 0; |
1575 | btrfs_unlock_up_safe(path, 1); | |
1576 | } | |
1577 | return err; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * helper to add new inline back ref | |
1582 | */ | |
1583 | static noinline_for_stack | |
143bede5 JM |
1584 | void setup_inline_extent_backref(struct btrfs_trans_handle *trans, |
1585 | struct btrfs_root *root, | |
1586 | struct btrfs_path *path, | |
1587 | struct btrfs_extent_inline_ref *iref, | |
1588 | u64 parent, u64 root_objectid, | |
1589 | u64 owner, u64 offset, int refs_to_add, | |
1590 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1591 | { |
1592 | struct extent_buffer *leaf; | |
1593 | struct btrfs_extent_item *ei; | |
1594 | unsigned long ptr; | |
1595 | unsigned long end; | |
1596 | unsigned long item_offset; | |
1597 | u64 refs; | |
1598 | int size; | |
1599 | int type; | |
5d4f98a2 YZ |
1600 | |
1601 | leaf = path->nodes[0]; | |
1602 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1603 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1604 | ||
1605 | type = extent_ref_type(parent, owner); | |
1606 | size = btrfs_extent_inline_ref_size(type); | |
1607 | ||
143bede5 | 1608 | btrfs_extend_item(trans, root, path, size); |
5d4f98a2 YZ |
1609 | |
1610 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1611 | refs = btrfs_extent_refs(leaf, ei); | |
1612 | refs += refs_to_add; | |
1613 | btrfs_set_extent_refs(leaf, ei, refs); | |
1614 | if (extent_op) | |
1615 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1616 | ||
1617 | ptr = (unsigned long)ei + item_offset; | |
1618 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1619 | if (ptr < end - size) | |
1620 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1621 | end - size - ptr); | |
1622 | ||
1623 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1624 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1625 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1626 | struct btrfs_extent_data_ref *dref; | |
1627 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1628 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1629 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1630 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1631 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1632 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1633 | struct btrfs_shared_data_ref *sref; | |
1634 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1635 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1636 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1637 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1638 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1639 | } else { | |
1640 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1641 | } | |
1642 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1643 | } |
1644 | ||
1645 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1646 | struct btrfs_root *root, | |
1647 | struct btrfs_path *path, | |
1648 | struct btrfs_extent_inline_ref **ref_ret, | |
1649 | u64 bytenr, u64 num_bytes, u64 parent, | |
1650 | u64 root_objectid, u64 owner, u64 offset) | |
1651 | { | |
1652 | int ret; | |
1653 | ||
1654 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1655 | bytenr, num_bytes, parent, | |
1656 | root_objectid, owner, offset, 0); | |
1657 | if (ret != -ENOENT) | |
54aa1f4d | 1658 | return ret; |
5d4f98a2 | 1659 | |
b3b4aa74 | 1660 | btrfs_release_path(path); |
5d4f98a2 YZ |
1661 | *ref_ret = NULL; |
1662 | ||
1663 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1664 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1665 | root_objectid); | |
1666 | } else { | |
1667 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1668 | root_objectid, owner, offset); | |
b9473439 | 1669 | } |
5d4f98a2 YZ |
1670 | return ret; |
1671 | } | |
31840ae1 | 1672 | |
5d4f98a2 YZ |
1673 | /* |
1674 | * helper to update/remove inline back ref | |
1675 | */ | |
1676 | static noinline_for_stack | |
143bede5 JM |
1677 | void update_inline_extent_backref(struct btrfs_trans_handle *trans, |
1678 | struct btrfs_root *root, | |
1679 | struct btrfs_path *path, | |
1680 | struct btrfs_extent_inline_ref *iref, | |
1681 | int refs_to_mod, | |
1682 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1683 | { |
1684 | struct extent_buffer *leaf; | |
1685 | struct btrfs_extent_item *ei; | |
1686 | struct btrfs_extent_data_ref *dref = NULL; | |
1687 | struct btrfs_shared_data_ref *sref = NULL; | |
1688 | unsigned long ptr; | |
1689 | unsigned long end; | |
1690 | u32 item_size; | |
1691 | int size; | |
1692 | int type; | |
5d4f98a2 YZ |
1693 | u64 refs; |
1694 | ||
1695 | leaf = path->nodes[0]; | |
1696 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1697 | refs = btrfs_extent_refs(leaf, ei); | |
1698 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1699 | refs += refs_to_mod; | |
1700 | btrfs_set_extent_refs(leaf, ei, refs); | |
1701 | if (extent_op) | |
1702 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1703 | ||
1704 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1705 | ||
1706 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1707 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1708 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1709 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1710 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1711 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1712 | } else { | |
1713 | refs = 1; | |
1714 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1715 | } |
31840ae1 | 1716 | |
5d4f98a2 YZ |
1717 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1718 | refs += refs_to_mod; | |
1719 | ||
1720 | if (refs > 0) { | |
1721 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1722 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1723 | else | |
1724 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1725 | } else { | |
1726 | size = btrfs_extent_inline_ref_size(type); | |
1727 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1728 | ptr = (unsigned long)iref; | |
1729 | end = (unsigned long)ei + item_size; | |
1730 | if (ptr + size < end) | |
1731 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1732 | end - ptr - size); | |
1733 | item_size -= size; | |
143bede5 | 1734 | btrfs_truncate_item(trans, root, path, item_size, 1); |
5d4f98a2 YZ |
1735 | } |
1736 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1737 | } |
1738 | ||
1739 | static noinline_for_stack | |
1740 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1741 | struct btrfs_root *root, | |
1742 | struct btrfs_path *path, | |
1743 | u64 bytenr, u64 num_bytes, u64 parent, | |
1744 | u64 root_objectid, u64 owner, | |
1745 | u64 offset, int refs_to_add, | |
1746 | struct btrfs_delayed_extent_op *extent_op) | |
1747 | { | |
1748 | struct btrfs_extent_inline_ref *iref; | |
1749 | int ret; | |
1750 | ||
1751 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1752 | bytenr, num_bytes, parent, | |
1753 | root_objectid, owner, offset, 1); | |
1754 | if (ret == 0) { | |
1755 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
143bede5 JM |
1756 | update_inline_extent_backref(trans, root, path, iref, |
1757 | refs_to_add, extent_op); | |
5d4f98a2 | 1758 | } else if (ret == -ENOENT) { |
143bede5 JM |
1759 | setup_inline_extent_backref(trans, root, path, iref, parent, |
1760 | root_objectid, owner, offset, | |
1761 | refs_to_add, extent_op); | |
1762 | ret = 0; | |
771ed689 | 1763 | } |
5d4f98a2 YZ |
1764 | return ret; |
1765 | } | |
31840ae1 | 1766 | |
5d4f98a2 YZ |
1767 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1768 | struct btrfs_root *root, | |
1769 | struct btrfs_path *path, | |
1770 | u64 bytenr, u64 parent, u64 root_objectid, | |
1771 | u64 owner, u64 offset, int refs_to_add) | |
1772 | { | |
1773 | int ret; | |
1774 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1775 | BUG_ON(refs_to_add != 1); | |
1776 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1777 | parent, root_objectid); | |
1778 | } else { | |
1779 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1780 | parent, root_objectid, | |
1781 | owner, offset, refs_to_add); | |
1782 | } | |
1783 | return ret; | |
1784 | } | |
56bec294 | 1785 | |
5d4f98a2 YZ |
1786 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1787 | struct btrfs_root *root, | |
1788 | struct btrfs_path *path, | |
1789 | struct btrfs_extent_inline_ref *iref, | |
1790 | int refs_to_drop, int is_data) | |
1791 | { | |
143bede5 | 1792 | int ret = 0; |
b9473439 | 1793 | |
5d4f98a2 YZ |
1794 | BUG_ON(!is_data && refs_to_drop != 1); |
1795 | if (iref) { | |
143bede5 JM |
1796 | update_inline_extent_backref(trans, root, path, iref, |
1797 | -refs_to_drop, NULL); | |
5d4f98a2 YZ |
1798 | } else if (is_data) { |
1799 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1800 | } else { | |
1801 | ret = btrfs_del_item(trans, root, path); | |
1802 | } | |
1803 | return ret; | |
1804 | } | |
1805 | ||
5378e607 | 1806 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1807 | u64 start, u64 len) |
1808 | { | |
5378e607 | 1809 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1810 | } |
5d4f98a2 YZ |
1811 | |
1812 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1813 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1814 | { |
5d4f98a2 | 1815 | int ret; |
5378e607 | 1816 | u64 discarded_bytes = 0; |
a1d3c478 | 1817 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1818 | |
e244a0ae | 1819 | |
5d4f98a2 | 1820 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1821 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1822 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1823 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1824 | if (!ret) { |
a1d3c478 | 1825 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1826 | int i; |
1827 | ||
5d4f98a2 | 1828 | |
a1d3c478 | 1829 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1830 | if (!stripe->dev->can_discard) |
1831 | continue; | |
1832 | ||
5378e607 LD |
1833 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1834 | stripe->physical, | |
1835 | stripe->length); | |
1836 | if (!ret) | |
1837 | discarded_bytes += stripe->length; | |
1838 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1839 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1840 | |
1841 | /* | |
1842 | * Just in case we get back EOPNOTSUPP for some reason, | |
1843 | * just ignore the return value so we don't screw up | |
1844 | * people calling discard_extent. | |
1845 | */ | |
1846 | ret = 0; | |
5d4f98a2 | 1847 | } |
a1d3c478 | 1848 | kfree(bbio); |
5d4f98a2 | 1849 | } |
5378e607 LD |
1850 | |
1851 | if (actual_bytes) | |
1852 | *actual_bytes = discarded_bytes; | |
1853 | ||
5d4f98a2 YZ |
1854 | |
1855 | return ret; | |
5d4f98a2 YZ |
1856 | } |
1857 | ||
79787eaa | 1858 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1859 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1860 | struct btrfs_root *root, | |
1861 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1862 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1863 | { |
1864 | int ret; | |
66d7e7f0 AJ |
1865 | struct btrfs_fs_info *fs_info = root->fs_info; |
1866 | ||
5d4f98a2 YZ |
1867 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1868 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1869 | ||
1870 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1871 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1872 | num_bytes, | |
5d4f98a2 | 1873 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1874 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1875 | } else { |
66d7e7f0 AJ |
1876 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1877 | num_bytes, | |
5d4f98a2 | 1878 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1879 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1880 | } |
1881 | return ret; | |
1882 | } | |
1883 | ||
1884 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1885 | struct btrfs_root *root, | |
1886 | u64 bytenr, u64 num_bytes, | |
1887 | u64 parent, u64 root_objectid, | |
1888 | u64 owner, u64 offset, int refs_to_add, | |
1889 | struct btrfs_delayed_extent_op *extent_op) | |
1890 | { | |
1891 | struct btrfs_path *path; | |
1892 | struct extent_buffer *leaf; | |
1893 | struct btrfs_extent_item *item; | |
1894 | u64 refs; | |
1895 | int ret; | |
1896 | int err = 0; | |
1897 | ||
1898 | path = btrfs_alloc_path(); | |
1899 | if (!path) | |
1900 | return -ENOMEM; | |
1901 | ||
1902 | path->reada = 1; | |
1903 | path->leave_spinning = 1; | |
1904 | /* this will setup the path even if it fails to insert the back ref */ | |
1905 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1906 | path, bytenr, num_bytes, parent, | |
1907 | root_objectid, owner, offset, | |
1908 | refs_to_add, extent_op); | |
1909 | if (ret == 0) | |
1910 | goto out; | |
1911 | ||
1912 | if (ret != -EAGAIN) { | |
1913 | err = ret; | |
1914 | goto out; | |
1915 | } | |
1916 | ||
1917 | leaf = path->nodes[0]; | |
1918 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1919 | refs = btrfs_extent_refs(leaf, item); | |
1920 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1921 | if (extent_op) | |
1922 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1923 | |
5d4f98a2 | 1924 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1925 | btrfs_release_path(path); |
56bec294 CM |
1926 | |
1927 | path->reada = 1; | |
b9473439 CM |
1928 | path->leave_spinning = 1; |
1929 | ||
56bec294 CM |
1930 | /* now insert the actual backref */ |
1931 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1932 | path, bytenr, parent, root_objectid, |
1933 | owner, offset, refs_to_add); | |
79787eaa JM |
1934 | if (ret) |
1935 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 1936 | out: |
56bec294 | 1937 | btrfs_free_path(path); |
5d4f98a2 | 1938 | return err; |
56bec294 CM |
1939 | } |
1940 | ||
5d4f98a2 YZ |
1941 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1942 | struct btrfs_root *root, | |
1943 | struct btrfs_delayed_ref_node *node, | |
1944 | struct btrfs_delayed_extent_op *extent_op, | |
1945 | int insert_reserved) | |
56bec294 | 1946 | { |
5d4f98a2 YZ |
1947 | int ret = 0; |
1948 | struct btrfs_delayed_data_ref *ref; | |
1949 | struct btrfs_key ins; | |
1950 | u64 parent = 0; | |
1951 | u64 ref_root = 0; | |
1952 | u64 flags = 0; | |
1953 | ||
1954 | ins.objectid = node->bytenr; | |
1955 | ins.offset = node->num_bytes; | |
1956 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1957 | ||
1958 | ref = btrfs_delayed_node_to_data_ref(node); | |
1959 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1960 | parent = ref->parent; | |
1961 | else | |
1962 | ref_root = ref->root; | |
1963 | ||
1964 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1965 | if (extent_op) { | |
1966 | BUG_ON(extent_op->update_key); | |
1967 | flags |= extent_op->flags_to_set; | |
1968 | } | |
1969 | ret = alloc_reserved_file_extent(trans, root, | |
1970 | parent, ref_root, flags, | |
1971 | ref->objectid, ref->offset, | |
1972 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1973 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1974 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1975 | node->num_bytes, parent, | |
1976 | ref_root, ref->objectid, | |
1977 | ref->offset, node->ref_mod, | |
1978 | extent_op); | |
1979 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1980 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1981 | node->num_bytes, parent, | |
1982 | ref_root, ref->objectid, | |
1983 | ref->offset, node->ref_mod, | |
1984 | extent_op); | |
1985 | } else { | |
1986 | BUG(); | |
1987 | } | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1992 | struct extent_buffer *leaf, | |
1993 | struct btrfs_extent_item *ei) | |
1994 | { | |
1995 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1996 | if (extent_op->update_flags) { | |
1997 | flags |= extent_op->flags_to_set; | |
1998 | btrfs_set_extent_flags(leaf, ei, flags); | |
1999 | } | |
2000 | ||
2001 | if (extent_op->update_key) { | |
2002 | struct btrfs_tree_block_info *bi; | |
2003 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2004 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2005 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2010 | struct btrfs_root *root, | |
2011 | struct btrfs_delayed_ref_node *node, | |
2012 | struct btrfs_delayed_extent_op *extent_op) | |
2013 | { | |
2014 | struct btrfs_key key; | |
2015 | struct btrfs_path *path; | |
2016 | struct btrfs_extent_item *ei; | |
2017 | struct extent_buffer *leaf; | |
2018 | u32 item_size; | |
56bec294 | 2019 | int ret; |
5d4f98a2 YZ |
2020 | int err = 0; |
2021 | ||
79787eaa JM |
2022 | if (trans->aborted) |
2023 | return 0; | |
2024 | ||
5d4f98a2 YZ |
2025 | path = btrfs_alloc_path(); |
2026 | if (!path) | |
2027 | return -ENOMEM; | |
2028 | ||
2029 | key.objectid = node->bytenr; | |
2030 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2031 | key.offset = node->num_bytes; | |
2032 | ||
2033 | path->reada = 1; | |
2034 | path->leave_spinning = 1; | |
2035 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2036 | path, 0, 1); | |
2037 | if (ret < 0) { | |
2038 | err = ret; | |
2039 | goto out; | |
2040 | } | |
2041 | if (ret > 0) { | |
2042 | err = -EIO; | |
2043 | goto out; | |
2044 | } | |
2045 | ||
2046 | leaf = path->nodes[0]; | |
2047 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2048 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2049 | if (item_size < sizeof(*ei)) { | |
2050 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2051 | path, (u64)-1, 0); | |
2052 | if (ret < 0) { | |
2053 | err = ret; | |
2054 | goto out; | |
2055 | } | |
2056 | leaf = path->nodes[0]; | |
2057 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2058 | } | |
2059 | #endif | |
2060 | BUG_ON(item_size < sizeof(*ei)); | |
2061 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2062 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2063 | |
5d4f98a2 YZ |
2064 | btrfs_mark_buffer_dirty(leaf); |
2065 | out: | |
2066 | btrfs_free_path(path); | |
2067 | return err; | |
56bec294 CM |
2068 | } |
2069 | ||
5d4f98a2 YZ |
2070 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2071 | struct btrfs_root *root, | |
2072 | struct btrfs_delayed_ref_node *node, | |
2073 | struct btrfs_delayed_extent_op *extent_op, | |
2074 | int insert_reserved) | |
56bec294 CM |
2075 | { |
2076 | int ret = 0; | |
5d4f98a2 YZ |
2077 | struct btrfs_delayed_tree_ref *ref; |
2078 | struct btrfs_key ins; | |
2079 | u64 parent = 0; | |
2080 | u64 ref_root = 0; | |
56bec294 | 2081 | |
5d4f98a2 YZ |
2082 | ins.objectid = node->bytenr; |
2083 | ins.offset = node->num_bytes; | |
2084 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2085 | |
5d4f98a2 YZ |
2086 | ref = btrfs_delayed_node_to_tree_ref(node); |
2087 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2088 | parent = ref->parent; | |
2089 | else | |
2090 | ref_root = ref->root; | |
2091 | ||
2092 | BUG_ON(node->ref_mod != 1); | |
2093 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2094 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2095 | !extent_op->update_key); | |
2096 | ret = alloc_reserved_tree_block(trans, root, | |
2097 | parent, ref_root, | |
2098 | extent_op->flags_to_set, | |
2099 | &extent_op->key, | |
2100 | ref->level, &ins); | |
5d4f98a2 YZ |
2101 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2102 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2103 | node->num_bytes, parent, ref_root, | |
2104 | ref->level, 0, 1, extent_op); | |
2105 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2106 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2107 | node->num_bytes, parent, ref_root, | |
2108 | ref->level, 0, 1, extent_op); | |
2109 | } else { | |
2110 | BUG(); | |
2111 | } | |
56bec294 CM |
2112 | return ret; |
2113 | } | |
2114 | ||
2115 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2116 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2117 | struct btrfs_root *root, | |
2118 | struct btrfs_delayed_ref_node *node, | |
2119 | struct btrfs_delayed_extent_op *extent_op, | |
2120 | int insert_reserved) | |
56bec294 | 2121 | { |
79787eaa JM |
2122 | int ret = 0; |
2123 | ||
2124 | if (trans->aborted) | |
2125 | return 0; | |
2126 | ||
5d4f98a2 | 2127 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2128 | struct btrfs_delayed_ref_head *head; |
2129 | /* | |
2130 | * we've hit the end of the chain and we were supposed | |
2131 | * to insert this extent into the tree. But, it got | |
2132 | * deleted before we ever needed to insert it, so all | |
2133 | * we have to do is clean up the accounting | |
2134 | */ | |
5d4f98a2 YZ |
2135 | BUG_ON(extent_op); |
2136 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2137 | if (insert_reserved) { |
f0486c68 YZ |
2138 | btrfs_pin_extent(root, node->bytenr, |
2139 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2140 | if (head->is_data) { |
2141 | ret = btrfs_del_csums(trans, root, | |
2142 | node->bytenr, | |
2143 | node->num_bytes); | |
5d4f98a2 | 2144 | } |
56bec294 | 2145 | } |
79787eaa | 2146 | return ret; |
56bec294 CM |
2147 | } |
2148 | ||
5d4f98a2 YZ |
2149 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2150 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2151 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2152 | insert_reserved); | |
2153 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2154 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2155 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2156 | insert_reserved); | |
2157 | else | |
2158 | BUG(); | |
2159 | return ret; | |
56bec294 CM |
2160 | } |
2161 | ||
2162 | static noinline struct btrfs_delayed_ref_node * | |
2163 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2164 | { | |
2165 | struct rb_node *node; | |
2166 | struct btrfs_delayed_ref_node *ref; | |
2167 | int action = BTRFS_ADD_DELAYED_REF; | |
2168 | again: | |
2169 | /* | |
2170 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2171 | * this prevents ref count from going down to zero when | |
2172 | * there still are pending delayed ref. | |
2173 | */ | |
2174 | node = rb_prev(&head->node.rb_node); | |
2175 | while (1) { | |
2176 | if (!node) | |
2177 | break; | |
2178 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2179 | rb_node); | |
2180 | if (ref->bytenr != head->node.bytenr) | |
2181 | break; | |
5d4f98a2 | 2182 | if (ref->action == action) |
56bec294 CM |
2183 | return ref; |
2184 | node = rb_prev(node); | |
2185 | } | |
2186 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2187 | action = BTRFS_DROP_DELAYED_REF; | |
2188 | goto again; | |
2189 | } | |
2190 | return NULL; | |
2191 | } | |
2192 | ||
79787eaa JM |
2193 | /* |
2194 | * Returns 0 on success or if called with an already aborted transaction. | |
2195 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2196 | */ | |
c3e69d58 CM |
2197 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2198 | struct btrfs_root *root, | |
2199 | struct list_head *cluster) | |
56bec294 | 2200 | { |
56bec294 CM |
2201 | struct btrfs_delayed_ref_root *delayed_refs; |
2202 | struct btrfs_delayed_ref_node *ref; | |
2203 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2204 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2205 | struct btrfs_fs_info *fs_info = root->fs_info; |
56bec294 | 2206 | int ret; |
c3e69d58 | 2207 | int count = 0; |
56bec294 | 2208 | int must_insert_reserved = 0; |
56bec294 CM |
2209 | |
2210 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2211 | while (1) { |
2212 | if (!locked_ref) { | |
c3e69d58 CM |
2213 | /* pick a new head ref from the cluster list */ |
2214 | if (list_empty(cluster)) | |
56bec294 | 2215 | break; |
56bec294 | 2216 | |
c3e69d58 CM |
2217 | locked_ref = list_entry(cluster->next, |
2218 | struct btrfs_delayed_ref_head, cluster); | |
2219 | ||
2220 | /* grab the lock that says we are going to process | |
2221 | * all the refs for this head */ | |
2222 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2223 | ||
2224 | /* | |
2225 | * we may have dropped the spin lock to get the head | |
2226 | * mutex lock, and that might have given someone else | |
2227 | * time to free the head. If that's true, it has been | |
2228 | * removed from our list and we can move on. | |
2229 | */ | |
2230 | if (ret == -EAGAIN) { | |
2231 | locked_ref = NULL; | |
2232 | count++; | |
2233 | continue; | |
56bec294 CM |
2234 | } |
2235 | } | |
a28ec197 | 2236 | |
ae1e206b JB |
2237 | /* |
2238 | * We need to try and merge add/drops of the same ref since we | |
2239 | * can run into issues with relocate dropping the implicit ref | |
2240 | * and then it being added back again before the drop can | |
2241 | * finish. If we merged anything we need to re-loop so we can | |
2242 | * get a good ref. | |
2243 | */ | |
2244 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, | |
2245 | locked_ref); | |
2246 | ||
d1270cd9 AJ |
2247 | /* |
2248 | * locked_ref is the head node, so we have to go one | |
2249 | * node back for any delayed ref updates | |
2250 | */ | |
2251 | ref = select_delayed_ref(locked_ref); | |
2252 | ||
2253 | if (ref && ref->seq && | |
097b8a7c | 2254 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d1270cd9 AJ |
2255 | /* |
2256 | * there are still refs with lower seq numbers in the | |
2257 | * process of being added. Don't run this ref yet. | |
2258 | */ | |
2259 | list_del_init(&locked_ref->cluster); | |
093486c4 | 2260 | btrfs_delayed_ref_unlock(locked_ref); |
d1270cd9 AJ |
2261 | locked_ref = NULL; |
2262 | delayed_refs->num_heads_ready++; | |
2263 | spin_unlock(&delayed_refs->lock); | |
2264 | cond_resched(); | |
2265 | spin_lock(&delayed_refs->lock); | |
2266 | continue; | |
2267 | } | |
2268 | ||
56bec294 CM |
2269 | /* |
2270 | * record the must insert reserved flag before we | |
2271 | * drop the spin lock. | |
2272 | */ | |
2273 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2274 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2275 | |
5d4f98a2 YZ |
2276 | extent_op = locked_ref->extent_op; |
2277 | locked_ref->extent_op = NULL; | |
2278 | ||
56bec294 CM |
2279 | if (!ref) { |
2280 | /* All delayed refs have been processed, Go ahead | |
2281 | * and send the head node to run_one_delayed_ref, | |
2282 | * so that any accounting fixes can happen | |
2283 | */ | |
2284 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2285 | |
2286 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2287 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2288 | extent_op = NULL; |
2289 | } | |
2290 | ||
2291 | if (extent_op) { | |
2292 | spin_unlock(&delayed_refs->lock); | |
2293 | ||
2294 | ret = run_delayed_extent_op(trans, root, | |
2295 | ref, extent_op); | |
78a6184a | 2296 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2297 | |
79787eaa | 2298 | if (ret) { |
093486c4 MX |
2299 | printk(KERN_DEBUG |
2300 | "btrfs: run_delayed_extent_op " | |
2301 | "returned %d\n", ret); | |
253beebd | 2302 | spin_lock(&delayed_refs->lock); |
093486c4 | 2303 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2304 | return ret; |
2305 | } | |
2306 | ||
203bf287 | 2307 | goto next; |
5d4f98a2 | 2308 | } |
56bec294 | 2309 | } |
02217ed2 | 2310 | |
56bec294 CM |
2311 | ref->in_tree = 0; |
2312 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2313 | delayed_refs->num_entries--; | |
093486c4 | 2314 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2315 | /* |
2316 | * when we play the delayed ref, also correct the | |
2317 | * ref_mod on head | |
2318 | */ | |
2319 | switch (ref->action) { | |
2320 | case BTRFS_ADD_DELAYED_REF: | |
2321 | case BTRFS_ADD_DELAYED_EXTENT: | |
2322 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2323 | break; | |
2324 | case BTRFS_DROP_DELAYED_REF: | |
2325 | locked_ref->node.ref_mod += ref->ref_mod; | |
2326 | break; | |
2327 | default: | |
2328 | WARN_ON(1); | |
2329 | } | |
2330 | } | |
56bec294 | 2331 | spin_unlock(&delayed_refs->lock); |
925baedd | 2332 | |
5d4f98a2 | 2333 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2334 | must_insert_reserved); |
eb099670 | 2335 | |
78a6184a | 2336 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2337 | if (ret) { |
093486c4 MX |
2338 | btrfs_delayed_ref_unlock(locked_ref); |
2339 | btrfs_put_delayed_ref(ref); | |
2340 | printk(KERN_DEBUG | |
2341 | "btrfs: run_one_delayed_ref returned %d\n", ret); | |
253beebd | 2342 | spin_lock(&delayed_refs->lock); |
79787eaa JM |
2343 | return ret; |
2344 | } | |
2345 | ||
093486c4 MX |
2346 | /* |
2347 | * If this node is a head, that means all the refs in this head | |
2348 | * have been dealt with, and we will pick the next head to deal | |
2349 | * with, so we must unlock the head and drop it from the cluster | |
2350 | * list before we release it. | |
2351 | */ | |
2352 | if (btrfs_delayed_ref_is_head(ref)) { | |
2353 | list_del_init(&locked_ref->cluster); | |
2354 | btrfs_delayed_ref_unlock(locked_ref); | |
2355 | locked_ref = NULL; | |
2356 | } | |
2357 | btrfs_put_delayed_ref(ref); | |
2358 | count++; | |
203bf287 | 2359 | next: |
c3e69d58 CM |
2360 | cond_resched(); |
2361 | spin_lock(&delayed_refs->lock); | |
2362 | } | |
2363 | return count; | |
2364 | } | |
2365 | ||
709c0486 AJ |
2366 | #ifdef SCRAMBLE_DELAYED_REFS |
2367 | /* | |
2368 | * Normally delayed refs get processed in ascending bytenr order. This | |
2369 | * correlates in most cases to the order added. To expose dependencies on this | |
2370 | * order, we start to process the tree in the middle instead of the beginning | |
2371 | */ | |
2372 | static u64 find_middle(struct rb_root *root) | |
2373 | { | |
2374 | struct rb_node *n = root->rb_node; | |
2375 | struct btrfs_delayed_ref_node *entry; | |
2376 | int alt = 1; | |
2377 | u64 middle; | |
2378 | u64 first = 0, last = 0; | |
2379 | ||
2380 | n = rb_first(root); | |
2381 | if (n) { | |
2382 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2383 | first = entry->bytenr; | |
2384 | } | |
2385 | n = rb_last(root); | |
2386 | if (n) { | |
2387 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2388 | last = entry->bytenr; | |
2389 | } | |
2390 | n = root->rb_node; | |
2391 | ||
2392 | while (n) { | |
2393 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2394 | WARN_ON(!entry->in_tree); | |
2395 | ||
2396 | middle = entry->bytenr; | |
2397 | ||
2398 | if (alt) | |
2399 | n = n->rb_left; | |
2400 | else | |
2401 | n = n->rb_right; | |
2402 | ||
2403 | alt = 1 - alt; | |
2404 | } | |
2405 | return middle; | |
2406 | } | |
2407 | #endif | |
2408 | ||
bed92eae AJ |
2409 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2410 | struct btrfs_fs_info *fs_info) | |
2411 | { | |
2412 | struct qgroup_update *qgroup_update; | |
2413 | int ret = 0; | |
2414 | ||
2415 | if (list_empty(&trans->qgroup_ref_list) != | |
2416 | !trans->delayed_ref_elem.seq) { | |
2417 | /* list without seq or seq without list */ | |
2418 | printk(KERN_ERR "btrfs: qgroup accounting update error, list is%s empty, seq is %llu\n", | |
2419 | list_empty(&trans->qgroup_ref_list) ? "" : " not", | |
2420 | trans->delayed_ref_elem.seq); | |
2421 | BUG(); | |
2422 | } | |
2423 | ||
2424 | if (!trans->delayed_ref_elem.seq) | |
2425 | return 0; | |
2426 | ||
2427 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2428 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2429 | struct qgroup_update, list); | |
2430 | list_del(&qgroup_update->list); | |
2431 | if (!ret) | |
2432 | ret = btrfs_qgroup_account_ref( | |
2433 | trans, fs_info, qgroup_update->node, | |
2434 | qgroup_update->extent_op); | |
2435 | kfree(qgroup_update); | |
2436 | } | |
2437 | ||
2438 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2439 | ||
2440 | return ret; | |
2441 | } | |
2442 | ||
c3e69d58 CM |
2443 | /* |
2444 | * this starts processing the delayed reference count updates and | |
2445 | * extent insertions we have queued up so far. count can be | |
2446 | * 0, which means to process everything in the tree at the start | |
2447 | * of the run (but not newly added entries), or it can be some target | |
2448 | * number you'd like to process. | |
79787eaa JM |
2449 | * |
2450 | * Returns 0 on success or if called with an aborted transaction | |
2451 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2452 | */ |
2453 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2454 | struct btrfs_root *root, unsigned long count) | |
2455 | { | |
2456 | struct rb_node *node; | |
2457 | struct btrfs_delayed_ref_root *delayed_refs; | |
2458 | struct btrfs_delayed_ref_node *ref; | |
2459 | struct list_head cluster; | |
2460 | int ret; | |
a168650c | 2461 | u64 delayed_start; |
c3e69d58 CM |
2462 | int run_all = count == (unsigned long)-1; |
2463 | int run_most = 0; | |
1fa11e26 | 2464 | int loops; |
c3e69d58 | 2465 | |
79787eaa JM |
2466 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2467 | if (trans->aborted) | |
2468 | return 0; | |
2469 | ||
c3e69d58 CM |
2470 | if (root == root->fs_info->extent_root) |
2471 | root = root->fs_info->tree_root; | |
2472 | ||
edf39272 JS |
2473 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2474 | ||
c3e69d58 CM |
2475 | delayed_refs = &trans->transaction->delayed_refs; |
2476 | INIT_LIST_HEAD(&cluster); | |
2477 | again: | |
1fa11e26 | 2478 | loops = 0; |
c3e69d58 | 2479 | spin_lock(&delayed_refs->lock); |
097b8a7c | 2480 | |
709c0486 AJ |
2481 | #ifdef SCRAMBLE_DELAYED_REFS |
2482 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2483 | #endif | |
2484 | ||
c3e69d58 CM |
2485 | if (count == 0) { |
2486 | count = delayed_refs->num_entries * 2; | |
2487 | run_most = 1; | |
2488 | } | |
2489 | while (1) { | |
2490 | if (!(run_all || run_most) && | |
2491 | delayed_refs->num_heads_ready < 64) | |
2492 | break; | |
eb099670 | 2493 | |
56bec294 | 2494 | /* |
c3e69d58 CM |
2495 | * go find something we can process in the rbtree. We start at |
2496 | * the beginning of the tree, and then build a cluster | |
2497 | * of refs to process starting at the first one we are able to | |
2498 | * lock | |
56bec294 | 2499 | */ |
a168650c | 2500 | delayed_start = delayed_refs->run_delayed_start; |
c3e69d58 CM |
2501 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2502 | delayed_refs->run_delayed_start); | |
2503 | if (ret) | |
56bec294 CM |
2504 | break; |
2505 | ||
c3e69d58 | 2506 | ret = run_clustered_refs(trans, root, &cluster); |
79787eaa | 2507 | if (ret < 0) { |
093486c4 | 2508 | btrfs_release_ref_cluster(&cluster); |
79787eaa JM |
2509 | spin_unlock(&delayed_refs->lock); |
2510 | btrfs_abort_transaction(trans, root, ret); | |
2511 | return ret; | |
2512 | } | |
c3e69d58 CM |
2513 | |
2514 | count -= min_t(unsigned long, ret, count); | |
2515 | ||
2516 | if (count == 0) | |
2517 | break; | |
a168650c | 2518 | |
1fa11e26 AJ |
2519 | if (delayed_start >= delayed_refs->run_delayed_start) { |
2520 | if (loops == 0) { | |
2521 | /* | |
2522 | * btrfs_find_ref_cluster looped. let's do one | |
2523 | * more cycle. if we don't run any delayed ref | |
2524 | * during that cycle (because we can't because | |
2525 | * all of them are blocked), bail out. | |
2526 | */ | |
2527 | loops = 1; | |
2528 | } else { | |
2529 | /* | |
2530 | * no runnable refs left, stop trying | |
2531 | */ | |
2532 | BUG_ON(run_all); | |
2533 | break; | |
2534 | } | |
2535 | } | |
2536 | if (ret) { | |
a168650c | 2537 | /* refs were run, let's reset staleness detection */ |
1fa11e26 | 2538 | loops = 0; |
a168650c | 2539 | } |
eb099670 | 2540 | } |
c3e69d58 | 2541 | |
56bec294 | 2542 | if (run_all) { |
ea658bad JB |
2543 | if (!list_empty(&trans->new_bgs)) { |
2544 | spin_unlock(&delayed_refs->lock); | |
2545 | btrfs_create_pending_block_groups(trans, root); | |
2546 | spin_lock(&delayed_refs->lock); | |
2547 | } | |
2548 | ||
56bec294 | 2549 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2550 | if (!node) |
56bec294 | 2551 | goto out; |
c3e69d58 | 2552 | count = (unsigned long)-1; |
e9d0b13b | 2553 | |
56bec294 CM |
2554 | while (node) { |
2555 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2556 | rb_node); | |
2557 | if (btrfs_delayed_ref_is_head(ref)) { | |
2558 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2559 | |
56bec294 CM |
2560 | head = btrfs_delayed_node_to_head(ref); |
2561 | atomic_inc(&ref->refs); | |
2562 | ||
2563 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2564 | /* |
2565 | * Mutex was contended, block until it's | |
2566 | * released and try again | |
2567 | */ | |
56bec294 CM |
2568 | mutex_lock(&head->mutex); |
2569 | mutex_unlock(&head->mutex); | |
2570 | ||
2571 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2572 | cond_resched(); |
56bec294 CM |
2573 | goto again; |
2574 | } | |
2575 | node = rb_next(node); | |
2576 | } | |
2577 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2578 | schedule_timeout(1); |
2579 | goto again; | |
5f39d397 | 2580 | } |
54aa1f4d | 2581 | out: |
c3e69d58 | 2582 | spin_unlock(&delayed_refs->lock); |
edf39272 | 2583 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2584 | return 0; |
2585 | } | |
2586 | ||
5d4f98a2 YZ |
2587 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2588 | struct btrfs_root *root, | |
2589 | u64 bytenr, u64 num_bytes, u64 flags, | |
2590 | int is_data) | |
2591 | { | |
2592 | struct btrfs_delayed_extent_op *extent_op; | |
2593 | int ret; | |
2594 | ||
78a6184a | 2595 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2596 | if (!extent_op) |
2597 | return -ENOMEM; | |
2598 | ||
2599 | extent_op->flags_to_set = flags; | |
2600 | extent_op->update_flags = 1; | |
2601 | extent_op->update_key = 0; | |
2602 | extent_op->is_data = is_data ? 1 : 0; | |
2603 | ||
66d7e7f0 AJ |
2604 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2605 | num_bytes, extent_op); | |
5d4f98a2 | 2606 | if (ret) |
78a6184a | 2607 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2608 | return ret; |
2609 | } | |
2610 | ||
2611 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2612 | struct btrfs_root *root, | |
2613 | struct btrfs_path *path, | |
2614 | u64 objectid, u64 offset, u64 bytenr) | |
2615 | { | |
2616 | struct btrfs_delayed_ref_head *head; | |
2617 | struct btrfs_delayed_ref_node *ref; | |
2618 | struct btrfs_delayed_data_ref *data_ref; | |
2619 | struct btrfs_delayed_ref_root *delayed_refs; | |
2620 | struct rb_node *node; | |
2621 | int ret = 0; | |
2622 | ||
2623 | ret = -ENOENT; | |
2624 | delayed_refs = &trans->transaction->delayed_refs; | |
2625 | spin_lock(&delayed_refs->lock); | |
2626 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2627 | if (!head) | |
2628 | goto out; | |
2629 | ||
2630 | if (!mutex_trylock(&head->mutex)) { | |
2631 | atomic_inc(&head->node.refs); | |
2632 | spin_unlock(&delayed_refs->lock); | |
2633 | ||
b3b4aa74 | 2634 | btrfs_release_path(path); |
5d4f98a2 | 2635 | |
8cc33e5c DS |
2636 | /* |
2637 | * Mutex was contended, block until it's released and let | |
2638 | * caller try again | |
2639 | */ | |
5d4f98a2 YZ |
2640 | mutex_lock(&head->mutex); |
2641 | mutex_unlock(&head->mutex); | |
2642 | btrfs_put_delayed_ref(&head->node); | |
2643 | return -EAGAIN; | |
2644 | } | |
2645 | ||
2646 | node = rb_prev(&head->node.rb_node); | |
2647 | if (!node) | |
2648 | goto out_unlock; | |
2649 | ||
2650 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2651 | ||
2652 | if (ref->bytenr != bytenr) | |
2653 | goto out_unlock; | |
2654 | ||
2655 | ret = 1; | |
2656 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2657 | goto out_unlock; | |
2658 | ||
2659 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2660 | ||
2661 | node = rb_prev(node); | |
2662 | if (node) { | |
df57dbe6 LB |
2663 | int seq = ref->seq; |
2664 | ||
5d4f98a2 | 2665 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
df57dbe6 | 2666 | if (ref->bytenr == bytenr && ref->seq == seq) |
5d4f98a2 YZ |
2667 | goto out_unlock; |
2668 | } | |
2669 | ||
2670 | if (data_ref->root != root->root_key.objectid || | |
2671 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2672 | goto out_unlock; | |
2673 | ||
2674 | ret = 0; | |
2675 | out_unlock: | |
2676 | mutex_unlock(&head->mutex); | |
2677 | out: | |
2678 | spin_unlock(&delayed_refs->lock); | |
2679 | return ret; | |
2680 | } | |
2681 | ||
2682 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2683 | struct btrfs_root *root, | |
2684 | struct btrfs_path *path, | |
2685 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2686 | { |
2687 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2688 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2689 | struct btrfs_extent_data_ref *ref; |
2690 | struct btrfs_extent_inline_ref *iref; | |
2691 | struct btrfs_extent_item *ei; | |
f321e491 | 2692 | struct btrfs_key key; |
5d4f98a2 | 2693 | u32 item_size; |
be20aa9d | 2694 | int ret; |
925baedd | 2695 | |
be20aa9d | 2696 | key.objectid = bytenr; |
31840ae1 | 2697 | key.offset = (u64)-1; |
f321e491 | 2698 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2699 | |
be20aa9d CM |
2700 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2701 | if (ret < 0) | |
2702 | goto out; | |
79787eaa | 2703 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2704 | |
2705 | ret = -ENOENT; | |
2706 | if (path->slots[0] == 0) | |
31840ae1 | 2707 | goto out; |
be20aa9d | 2708 | |
31840ae1 | 2709 | path->slots[0]--; |
f321e491 | 2710 | leaf = path->nodes[0]; |
5d4f98a2 | 2711 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2712 | |
5d4f98a2 | 2713 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2714 | goto out; |
f321e491 | 2715 | |
5d4f98a2 YZ |
2716 | ret = 1; |
2717 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2718 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2719 | if (item_size < sizeof(*ei)) { | |
2720 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2721 | goto out; | |
2722 | } | |
2723 | #endif | |
2724 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2725 | |
5d4f98a2 YZ |
2726 | if (item_size != sizeof(*ei) + |
2727 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2728 | goto out; | |
be20aa9d | 2729 | |
5d4f98a2 YZ |
2730 | if (btrfs_extent_generation(leaf, ei) <= |
2731 | btrfs_root_last_snapshot(&root->root_item)) | |
2732 | goto out; | |
2733 | ||
2734 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2735 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2736 | BTRFS_EXTENT_DATA_REF_KEY) | |
2737 | goto out; | |
2738 | ||
2739 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2740 | if (btrfs_extent_refs(leaf, ei) != | |
2741 | btrfs_extent_data_ref_count(leaf, ref) || | |
2742 | btrfs_extent_data_ref_root(leaf, ref) != | |
2743 | root->root_key.objectid || | |
2744 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2745 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2746 | goto out; | |
2747 | ||
2748 | ret = 0; | |
2749 | out: | |
2750 | return ret; | |
2751 | } | |
2752 | ||
2753 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2754 | struct btrfs_root *root, | |
2755 | u64 objectid, u64 offset, u64 bytenr) | |
2756 | { | |
2757 | struct btrfs_path *path; | |
2758 | int ret; | |
2759 | int ret2; | |
2760 | ||
2761 | path = btrfs_alloc_path(); | |
2762 | if (!path) | |
2763 | return -ENOENT; | |
2764 | ||
2765 | do { | |
2766 | ret = check_committed_ref(trans, root, path, objectid, | |
2767 | offset, bytenr); | |
2768 | if (ret && ret != -ENOENT) | |
f321e491 | 2769 | goto out; |
80ff3856 | 2770 | |
5d4f98a2 YZ |
2771 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2772 | offset, bytenr); | |
2773 | } while (ret2 == -EAGAIN); | |
2774 | ||
2775 | if (ret2 && ret2 != -ENOENT) { | |
2776 | ret = ret2; | |
2777 | goto out; | |
f321e491 | 2778 | } |
5d4f98a2 YZ |
2779 | |
2780 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2781 | ret = 0; | |
be20aa9d | 2782 | out: |
80ff3856 | 2783 | btrfs_free_path(path); |
f0486c68 YZ |
2784 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2785 | WARN_ON(ret > 0); | |
f321e491 | 2786 | return ret; |
be20aa9d | 2787 | } |
c5739bba | 2788 | |
5d4f98a2 | 2789 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2790 | struct btrfs_root *root, |
5d4f98a2 | 2791 | struct extent_buffer *buf, |
66d7e7f0 | 2792 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2793 | { |
2794 | u64 bytenr; | |
5d4f98a2 YZ |
2795 | u64 num_bytes; |
2796 | u64 parent; | |
31840ae1 | 2797 | u64 ref_root; |
31840ae1 | 2798 | u32 nritems; |
31840ae1 ZY |
2799 | struct btrfs_key key; |
2800 | struct btrfs_file_extent_item *fi; | |
2801 | int i; | |
2802 | int level; | |
2803 | int ret = 0; | |
31840ae1 | 2804 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2805 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2806 | |
2807 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2808 | nritems = btrfs_header_nritems(buf); |
2809 | level = btrfs_header_level(buf); | |
2810 | ||
5d4f98a2 YZ |
2811 | if (!root->ref_cows && level == 0) |
2812 | return 0; | |
31840ae1 | 2813 | |
5d4f98a2 YZ |
2814 | if (inc) |
2815 | process_func = btrfs_inc_extent_ref; | |
2816 | else | |
2817 | process_func = btrfs_free_extent; | |
31840ae1 | 2818 | |
5d4f98a2 YZ |
2819 | if (full_backref) |
2820 | parent = buf->start; | |
2821 | else | |
2822 | parent = 0; | |
2823 | ||
2824 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2825 | if (level == 0) { |
5d4f98a2 | 2826 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2827 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2828 | continue; | |
5d4f98a2 | 2829 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2830 | struct btrfs_file_extent_item); |
2831 | if (btrfs_file_extent_type(buf, fi) == | |
2832 | BTRFS_FILE_EXTENT_INLINE) | |
2833 | continue; | |
2834 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2835 | if (bytenr == 0) | |
2836 | continue; | |
5d4f98a2 YZ |
2837 | |
2838 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2839 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2840 | ret = process_func(trans, root, bytenr, num_bytes, | |
2841 | parent, ref_root, key.objectid, | |
66d7e7f0 | 2842 | key.offset, for_cow); |
31840ae1 ZY |
2843 | if (ret) |
2844 | goto fail; | |
2845 | } else { | |
5d4f98a2 YZ |
2846 | bytenr = btrfs_node_blockptr(buf, i); |
2847 | num_bytes = btrfs_level_size(root, level - 1); | |
2848 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
2849 | parent, ref_root, level - 1, 0, |
2850 | for_cow); | |
31840ae1 ZY |
2851 | if (ret) |
2852 | goto fail; | |
2853 | } | |
2854 | } | |
2855 | return 0; | |
2856 | fail: | |
5d4f98a2 YZ |
2857 | return ret; |
2858 | } | |
2859 | ||
2860 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 2861 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 2862 | { |
66d7e7f0 | 2863 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
2864 | } |
2865 | ||
2866 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 2867 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 2868 | { |
66d7e7f0 | 2869 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
2870 | } |
2871 | ||
9078a3e1 CM |
2872 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2873 | struct btrfs_root *root, | |
2874 | struct btrfs_path *path, | |
2875 | struct btrfs_block_group_cache *cache) | |
2876 | { | |
2877 | int ret; | |
9078a3e1 | 2878 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2879 | unsigned long bi; |
2880 | struct extent_buffer *leaf; | |
9078a3e1 | 2881 | |
9078a3e1 | 2882 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2883 | if (ret < 0) |
2884 | goto fail; | |
79787eaa | 2885 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
2886 | |
2887 | leaf = path->nodes[0]; | |
2888 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2889 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2890 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2891 | btrfs_release_path(path); |
54aa1f4d | 2892 | fail: |
79787eaa JM |
2893 | if (ret) { |
2894 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 2895 | return ret; |
79787eaa | 2896 | } |
9078a3e1 CM |
2897 | return 0; |
2898 | ||
2899 | } | |
2900 | ||
4a8c9a62 YZ |
2901 | static struct btrfs_block_group_cache * |
2902 | next_block_group(struct btrfs_root *root, | |
2903 | struct btrfs_block_group_cache *cache) | |
2904 | { | |
2905 | struct rb_node *node; | |
2906 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2907 | node = rb_next(&cache->cache_node); | |
2908 | btrfs_put_block_group(cache); | |
2909 | if (node) { | |
2910 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2911 | cache_node); | |
11dfe35a | 2912 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2913 | } else |
2914 | cache = NULL; | |
2915 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2916 | return cache; | |
2917 | } | |
2918 | ||
0af3d00b JB |
2919 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2920 | struct btrfs_trans_handle *trans, | |
2921 | struct btrfs_path *path) | |
2922 | { | |
2923 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2924 | struct inode *inode = NULL; | |
2925 | u64 alloc_hint = 0; | |
2b20982e | 2926 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2927 | int num_pages = 0; |
2928 | int retries = 0; | |
2929 | int ret = 0; | |
2930 | ||
2931 | /* | |
2932 | * If this block group is smaller than 100 megs don't bother caching the | |
2933 | * block group. | |
2934 | */ | |
2935 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2936 | spin_lock(&block_group->lock); | |
2937 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2938 | spin_unlock(&block_group->lock); | |
2939 | return 0; | |
2940 | } | |
2941 | ||
2942 | again: | |
2943 | inode = lookup_free_space_inode(root, block_group, path); | |
2944 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2945 | ret = PTR_ERR(inode); | |
b3b4aa74 | 2946 | btrfs_release_path(path); |
0af3d00b JB |
2947 | goto out; |
2948 | } | |
2949 | ||
2950 | if (IS_ERR(inode)) { | |
2951 | BUG_ON(retries); | |
2952 | retries++; | |
2953 | ||
2954 | if (block_group->ro) | |
2955 | goto out_free; | |
2956 | ||
2957 | ret = create_free_space_inode(root, trans, block_group, path); | |
2958 | if (ret) | |
2959 | goto out_free; | |
2960 | goto again; | |
2961 | } | |
2962 | ||
5b0e95bf JB |
2963 | /* We've already setup this transaction, go ahead and exit */ |
2964 | if (block_group->cache_generation == trans->transid && | |
2965 | i_size_read(inode)) { | |
2966 | dcs = BTRFS_DC_SETUP; | |
2967 | goto out_put; | |
2968 | } | |
2969 | ||
0af3d00b JB |
2970 | /* |
2971 | * We want to set the generation to 0, that way if anything goes wrong | |
2972 | * from here on out we know not to trust this cache when we load up next | |
2973 | * time. | |
2974 | */ | |
2975 | BTRFS_I(inode)->generation = 0; | |
2976 | ret = btrfs_update_inode(trans, root, inode); | |
2977 | WARN_ON(ret); | |
2978 | ||
2979 | if (i_size_read(inode) > 0) { | |
2980 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2981 | inode); | |
2982 | if (ret) | |
2983 | goto out_put; | |
2984 | } | |
2985 | ||
2986 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
2987 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
2988 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
2989 | /* | |
2990 | * don't bother trying to write stuff out _if_ | |
2991 | * a) we're not cached, | |
2992 | * b) we're with nospace_cache mount option. | |
2993 | */ | |
2b20982e | 2994 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
2995 | spin_unlock(&block_group->lock); |
2996 | goto out_put; | |
2997 | } | |
2998 | spin_unlock(&block_group->lock); | |
2999 | ||
6fc823b1 JB |
3000 | /* |
3001 | * Try to preallocate enough space based on how big the block group is. | |
3002 | * Keep in mind this has to include any pinned space which could end up | |
3003 | * taking up quite a bit since it's not folded into the other space | |
3004 | * cache. | |
3005 | */ | |
3006 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3007 | if (!num_pages) |
3008 | num_pages = 1; | |
3009 | ||
0af3d00b JB |
3010 | num_pages *= 16; |
3011 | num_pages *= PAGE_CACHE_SIZE; | |
3012 | ||
3013 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3014 | if (ret) | |
3015 | goto out_put; | |
3016 | ||
3017 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3018 | num_pages, num_pages, | |
3019 | &alloc_hint); | |
2b20982e JB |
3020 | if (!ret) |
3021 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3022 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3023 | |
0af3d00b JB |
3024 | out_put: |
3025 | iput(inode); | |
3026 | out_free: | |
b3b4aa74 | 3027 | btrfs_release_path(path); |
0af3d00b JB |
3028 | out: |
3029 | spin_lock(&block_group->lock); | |
e65cbb94 | 3030 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3031 | block_group->cache_generation = trans->transid; |
2b20982e | 3032 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3033 | spin_unlock(&block_group->lock); |
3034 | ||
3035 | return ret; | |
3036 | } | |
3037 | ||
96b5179d CM |
3038 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3039 | struct btrfs_root *root) | |
9078a3e1 | 3040 | { |
4a8c9a62 | 3041 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3042 | int err = 0; |
9078a3e1 | 3043 | struct btrfs_path *path; |
96b5179d | 3044 | u64 last = 0; |
9078a3e1 CM |
3045 | |
3046 | path = btrfs_alloc_path(); | |
3047 | if (!path) | |
3048 | return -ENOMEM; | |
3049 | ||
0af3d00b JB |
3050 | again: |
3051 | while (1) { | |
3052 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3053 | while (cache) { | |
3054 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3055 | break; | |
3056 | cache = next_block_group(root, cache); | |
3057 | } | |
3058 | if (!cache) { | |
3059 | if (last == 0) | |
3060 | break; | |
3061 | last = 0; | |
3062 | continue; | |
3063 | } | |
3064 | err = cache_save_setup(cache, trans, path); | |
3065 | last = cache->key.objectid + cache->key.offset; | |
3066 | btrfs_put_block_group(cache); | |
3067 | } | |
3068 | ||
d397712b | 3069 | while (1) { |
4a8c9a62 YZ |
3070 | if (last == 0) { |
3071 | err = btrfs_run_delayed_refs(trans, root, | |
3072 | (unsigned long)-1); | |
79787eaa JM |
3073 | if (err) /* File system offline */ |
3074 | goto out; | |
0f9dd46c | 3075 | } |
54aa1f4d | 3076 | |
4a8c9a62 YZ |
3077 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3078 | while (cache) { | |
0af3d00b JB |
3079 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3080 | btrfs_put_block_group(cache); | |
3081 | goto again; | |
3082 | } | |
3083 | ||
4a8c9a62 YZ |
3084 | if (cache->dirty) |
3085 | break; | |
3086 | cache = next_block_group(root, cache); | |
3087 | } | |
3088 | if (!cache) { | |
3089 | if (last == 0) | |
3090 | break; | |
3091 | last = 0; | |
3092 | continue; | |
3093 | } | |
0f9dd46c | 3094 | |
0cb59c99 JB |
3095 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3096 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3097 | cache->dirty = 0; |
4a8c9a62 | 3098 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3099 | |
4a8c9a62 | 3100 | err = write_one_cache_group(trans, root, path, cache); |
79787eaa JM |
3101 | if (err) /* File system offline */ |
3102 | goto out; | |
3103 | ||
4a8c9a62 | 3104 | btrfs_put_block_group(cache); |
9078a3e1 | 3105 | } |
4a8c9a62 | 3106 | |
0cb59c99 JB |
3107 | while (1) { |
3108 | /* | |
3109 | * I don't think this is needed since we're just marking our | |
3110 | * preallocated extent as written, but just in case it can't | |
3111 | * hurt. | |
3112 | */ | |
3113 | if (last == 0) { | |
3114 | err = btrfs_run_delayed_refs(trans, root, | |
3115 | (unsigned long)-1); | |
79787eaa JM |
3116 | if (err) /* File system offline */ |
3117 | goto out; | |
0cb59c99 JB |
3118 | } |
3119 | ||
3120 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3121 | while (cache) { | |
3122 | /* | |
3123 | * Really this shouldn't happen, but it could if we | |
3124 | * couldn't write the entire preallocated extent and | |
3125 | * splitting the extent resulted in a new block. | |
3126 | */ | |
3127 | if (cache->dirty) { | |
3128 | btrfs_put_block_group(cache); | |
3129 | goto again; | |
3130 | } | |
3131 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3132 | break; | |
3133 | cache = next_block_group(root, cache); | |
3134 | } | |
3135 | if (!cache) { | |
3136 | if (last == 0) | |
3137 | break; | |
3138 | last = 0; | |
3139 | continue; | |
3140 | } | |
3141 | ||
79787eaa | 3142 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3143 | |
3144 | /* | |
3145 | * If we didn't have an error then the cache state is still | |
3146 | * NEED_WRITE, so we can set it to WRITTEN. | |
3147 | */ | |
79787eaa | 3148 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3149 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3150 | last = cache->key.objectid + cache->key.offset; | |
3151 | btrfs_put_block_group(cache); | |
3152 | } | |
79787eaa | 3153 | out: |
0cb59c99 | 3154 | |
9078a3e1 | 3155 | btrfs_free_path(path); |
79787eaa | 3156 | return err; |
9078a3e1 CM |
3157 | } |
3158 | ||
d2fb3437 YZ |
3159 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3160 | { | |
3161 | struct btrfs_block_group_cache *block_group; | |
3162 | int readonly = 0; | |
3163 | ||
3164 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3165 | if (!block_group || block_group->ro) | |
3166 | readonly = 1; | |
3167 | if (block_group) | |
fa9c0d79 | 3168 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3169 | return readonly; |
3170 | } | |
3171 | ||
593060d7 CM |
3172 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3173 | u64 total_bytes, u64 bytes_used, | |
3174 | struct btrfs_space_info **space_info) | |
3175 | { | |
3176 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3177 | int i; |
3178 | int factor; | |
3179 | ||
3180 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3181 | BTRFS_BLOCK_GROUP_RAID10)) | |
3182 | factor = 2; | |
3183 | else | |
3184 | factor = 1; | |
593060d7 CM |
3185 | |
3186 | found = __find_space_info(info, flags); | |
3187 | if (found) { | |
25179201 | 3188 | spin_lock(&found->lock); |
593060d7 | 3189 | found->total_bytes += total_bytes; |
89a55897 | 3190 | found->disk_total += total_bytes * factor; |
593060d7 | 3191 | found->bytes_used += bytes_used; |
b742bb82 | 3192 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3193 | found->full = 0; |
25179201 | 3194 | spin_unlock(&found->lock); |
593060d7 CM |
3195 | *space_info = found; |
3196 | return 0; | |
3197 | } | |
c146afad | 3198 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3199 | if (!found) |
3200 | return -ENOMEM; | |
3201 | ||
b742bb82 YZ |
3202 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3203 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3204 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3205 | spin_lock_init(&found->lock); |
52ba6929 | 3206 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3207 | found->total_bytes = total_bytes; |
89a55897 | 3208 | found->disk_total = total_bytes * factor; |
593060d7 | 3209 | found->bytes_used = bytes_used; |
b742bb82 | 3210 | found->disk_used = bytes_used * factor; |
593060d7 | 3211 | found->bytes_pinned = 0; |
e8569813 | 3212 | found->bytes_reserved = 0; |
c146afad | 3213 | found->bytes_readonly = 0; |
f0486c68 | 3214 | found->bytes_may_use = 0; |
593060d7 | 3215 | found->full = 0; |
0e4f8f88 | 3216 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3217 | found->chunk_alloc = 0; |
fdb5effd JB |
3218 | found->flush = 0; |
3219 | init_waitqueue_head(&found->wait); | |
593060d7 | 3220 | *space_info = found; |
4184ea7f | 3221 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3222 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3223 | info->data_sinfo = found; | |
593060d7 CM |
3224 | return 0; |
3225 | } | |
3226 | ||
8790d502 CM |
3227 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3228 | { | |
899c81ea ID |
3229 | u64 extra_flags = chunk_to_extended(flags) & |
3230 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3231 | |
de98ced9 | 3232 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3233 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3234 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3235 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3236 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3237 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3238 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3239 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3240 | } |
593060d7 | 3241 | |
fc67c450 ID |
3242 | /* |
3243 | * returns target flags in extended format or 0 if restripe for this | |
3244 | * chunk_type is not in progress | |
c6664b42 ID |
3245 | * |
3246 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3247 | */ |
3248 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3249 | { | |
3250 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3251 | u64 target = 0; | |
3252 | ||
fc67c450 ID |
3253 | if (!bctl) |
3254 | return 0; | |
3255 | ||
3256 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3257 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3258 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3259 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3260 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3261 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3262 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3263 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3264 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3265 | } | |
3266 | ||
3267 | return target; | |
3268 | } | |
3269 | ||
a46d11a8 ID |
3270 | /* |
3271 | * @flags: available profiles in extended format (see ctree.h) | |
3272 | * | |
e4d8ec0f ID |
3273 | * Returns reduced profile in chunk format. If profile changing is in |
3274 | * progress (either running or paused) picks the target profile (if it's | |
3275 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3276 | */ |
2b82032c | 3277 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3278 | { |
cd02dca5 CM |
3279 | /* |
3280 | * we add in the count of missing devices because we want | |
3281 | * to make sure that any RAID levels on a degraded FS | |
3282 | * continue to be honored. | |
3283 | */ | |
3284 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3285 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3286 | u64 target; |
a061fc8d | 3287 | |
fc67c450 ID |
3288 | /* |
3289 | * see if restripe for this chunk_type is in progress, if so | |
3290 | * try to reduce to the target profile | |
3291 | */ | |
e4d8ec0f | 3292 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3293 | target = get_restripe_target(root->fs_info, flags); |
3294 | if (target) { | |
3295 | /* pick target profile only if it's already available */ | |
3296 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3297 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3298 | return extended_to_chunk(target); |
e4d8ec0f ID |
3299 | } |
3300 | } | |
3301 | spin_unlock(&root->fs_info->balance_lock); | |
3302 | ||
a061fc8d CM |
3303 | if (num_devices == 1) |
3304 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
3305 | if (num_devices < 4) | |
3306 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3307 | ||
ec44a35c CM |
3308 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
3309 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 3310 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 3311 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 3312 | } |
ec44a35c CM |
3313 | |
3314 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 3315 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 3316 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 3317 | } |
ec44a35c CM |
3318 | |
3319 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
3320 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
3321 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
a46d11a8 | 3322 | (flags & BTRFS_BLOCK_GROUP_DUP))) { |
ec44a35c | 3323 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; |
a46d11a8 ID |
3324 | } |
3325 | ||
899c81ea | 3326 | return extended_to_chunk(flags); |
ec44a35c CM |
3327 | } |
3328 | ||
b742bb82 | 3329 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3330 | { |
de98ced9 MX |
3331 | unsigned seq; |
3332 | ||
3333 | do { | |
3334 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3335 | ||
3336 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3337 | flags |= root->fs_info->avail_data_alloc_bits; | |
3338 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3339 | flags |= root->fs_info->avail_system_alloc_bits; | |
3340 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3341 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3342 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3343 | |
b742bb82 | 3344 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3345 | } |
3346 | ||
6d07bcec | 3347 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3348 | { |
b742bb82 | 3349 | u64 flags; |
9ed74f2d | 3350 | |
b742bb82 YZ |
3351 | if (data) |
3352 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3353 | else if (root == root->fs_info->chunk_root) | |
3354 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3355 | else |
b742bb82 | 3356 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3357 | |
b742bb82 | 3358 | return get_alloc_profile(root, flags); |
6a63209f | 3359 | } |
9ed74f2d | 3360 | |
6a63209f | 3361 | /* |
6a63209f JB |
3362 | * This will check the space that the inode allocates from to make sure we have |
3363 | * enough space for bytes. | |
6a63209f | 3364 | */ |
0ca1f7ce | 3365 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3366 | { |
6a63209f | 3367 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3368 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3369 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3370 | u64 used; |
0af3d00b | 3371 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3372 | |
6a63209f JB |
3373 | /* make sure bytes are sectorsize aligned */ |
3374 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3375 | |
82d5902d LZ |
3376 | if (root == root->fs_info->tree_root || |
3377 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3378 | alloc_chunk = 0; |
3379 | committed = 1; | |
3380 | } | |
3381 | ||
b4d7c3c9 | 3382 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3383 | if (!data_sinfo) |
3384 | goto alloc; | |
9ed74f2d | 3385 | |
6a63209f JB |
3386 | again: |
3387 | /* make sure we have enough space to handle the data first */ | |
3388 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3389 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3390 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3391 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3392 | |
3393 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3394 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3395 | |
6a63209f JB |
3396 | /* |
3397 | * if we don't have enough free bytes in this space then we need | |
3398 | * to alloc a new chunk. | |
3399 | */ | |
0af3d00b | 3400 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3401 | u64 alloc_target; |
9ed74f2d | 3402 | |
0e4f8f88 | 3403 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3404 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3405 | alloc: |
6a63209f | 3406 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3407 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3408 | if (IS_ERR(trans)) |
3409 | return PTR_ERR(trans); | |
9ed74f2d | 3410 | |
6a63209f | 3411 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3412 | alloc_target, |
3413 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3414 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3415 | if (ret < 0) { |
3416 | if (ret != -ENOSPC) | |
3417 | return ret; | |
3418 | else | |
3419 | goto commit_trans; | |
3420 | } | |
9ed74f2d | 3421 | |
b4d7c3c9 LZ |
3422 | if (!data_sinfo) |
3423 | data_sinfo = fs_info->data_sinfo; | |
3424 | ||
6a63209f JB |
3425 | goto again; |
3426 | } | |
f2bb8f5c JB |
3427 | |
3428 | /* | |
3429 | * If we have less pinned bytes than we want to allocate then | |
3430 | * don't bother committing the transaction, it won't help us. | |
3431 | */ | |
3432 | if (data_sinfo->bytes_pinned < bytes) | |
3433 | committed = 1; | |
6a63209f | 3434 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3435 | |
4e06bdd6 | 3436 | /* commit the current transaction and try again */ |
d52a5b5f | 3437 | commit_trans: |
a4abeea4 JB |
3438 | if (!committed && |
3439 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3440 | committed = 1; |
7a7eaa40 | 3441 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3442 | if (IS_ERR(trans)) |
3443 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3444 | ret = btrfs_commit_transaction(trans, root); |
3445 | if (ret) | |
3446 | return ret; | |
3447 | goto again; | |
3448 | } | |
9ed74f2d | 3449 | |
6a63209f JB |
3450 | return -ENOSPC; |
3451 | } | |
3452 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3453 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3454 | data_sinfo->flags, bytes, 1); |
6a63209f | 3455 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3456 | |
9ed74f2d | 3457 | return 0; |
9ed74f2d | 3458 | } |
6a63209f | 3459 | |
6a63209f | 3460 | /* |
fb25e914 | 3461 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3462 | */ |
0ca1f7ce | 3463 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3464 | { |
0ca1f7ce | 3465 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3466 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3467 | |
6a63209f JB |
3468 | /* make sure bytes are sectorsize aligned */ |
3469 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3470 | |
b4d7c3c9 | 3471 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f JB |
3472 | spin_lock(&data_sinfo->lock); |
3473 | data_sinfo->bytes_may_use -= bytes; | |
8c2a3ca2 | 3474 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3475 | data_sinfo->flags, bytes, 0); |
6a63209f | 3476 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3477 | } |
3478 | ||
97e728d4 | 3479 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3480 | { |
97e728d4 JB |
3481 | struct list_head *head = &info->space_info; |
3482 | struct btrfs_space_info *found; | |
e3ccfa98 | 3483 | |
97e728d4 JB |
3484 | rcu_read_lock(); |
3485 | list_for_each_entry_rcu(found, head, list) { | |
3486 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3487 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3488 | } |
97e728d4 | 3489 | rcu_read_unlock(); |
e3ccfa98 JB |
3490 | } |
3491 | ||
e5bc2458 | 3492 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3493 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3494 | { |
fb25e914 | 3495 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3496 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3497 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3498 | u64 thresh; |
e3ccfa98 | 3499 | |
0e4f8f88 CM |
3500 | if (force == CHUNK_ALLOC_FORCE) |
3501 | return 1; | |
3502 | ||
fb25e914 JB |
3503 | /* |
3504 | * We need to take into account the global rsv because for all intents | |
3505 | * and purposes it's used space. Don't worry about locking the | |
3506 | * global_rsv, it doesn't change except when the transaction commits. | |
3507 | */ | |
54338b5c JB |
3508 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3509 | num_allocated += global_rsv->size; | |
fb25e914 | 3510 | |
0e4f8f88 CM |
3511 | /* |
3512 | * in limited mode, we want to have some free space up to | |
3513 | * about 1% of the FS size. | |
3514 | */ | |
3515 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3516 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3517 | thresh = max_t(u64, 64 * 1024 * 1024, |
3518 | div_factor_fine(thresh, 1)); | |
3519 | ||
3520 | if (num_bytes - num_allocated < thresh) | |
3521 | return 1; | |
3522 | } | |
0e4f8f88 | 3523 | |
698d0082 | 3524 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3525 | return 0; |
424499db | 3526 | return 1; |
32c00aff JB |
3527 | } |
3528 | ||
15d1ff81 LB |
3529 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3530 | { | |
3531 | u64 num_dev; | |
3532 | ||
3533 | if (type & BTRFS_BLOCK_GROUP_RAID10 || | |
3534 | type & BTRFS_BLOCK_GROUP_RAID0) | |
3535 | num_dev = root->fs_info->fs_devices->rw_devices; | |
3536 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3537 | num_dev = 2; | |
3538 | else | |
3539 | num_dev = 1; /* DUP or single */ | |
3540 | ||
3541 | /* metadata for updaing devices and chunk tree */ | |
3542 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3543 | } | |
3544 | ||
3545 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3546 | struct btrfs_root *root, u64 type) | |
3547 | { | |
3548 | struct btrfs_space_info *info; | |
3549 | u64 left; | |
3550 | u64 thresh; | |
3551 | ||
3552 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3553 | spin_lock(&info->lock); | |
3554 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3555 | info->bytes_reserved - info->bytes_readonly; | |
3556 | spin_unlock(&info->lock); | |
3557 | ||
3558 | thresh = get_system_chunk_thresh(root, type); | |
3559 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
3560 | printk(KERN_INFO "left=%llu, need=%llu, flags=%llu\n", | |
3561 | left, thresh, type); | |
3562 | dump_space_info(info, 0, 0); | |
3563 | } | |
3564 | ||
3565 | if (left < thresh) { | |
3566 | u64 flags; | |
3567 | ||
3568 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3569 | btrfs_alloc_chunk(trans, root, flags); | |
3570 | } | |
3571 | } | |
3572 | ||
6324fbf3 | 3573 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3574 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3575 | { |
6324fbf3 | 3576 | struct btrfs_space_info *space_info; |
97e728d4 | 3577 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3578 | int wait_for_alloc = 0; |
9ed74f2d | 3579 | int ret = 0; |
9ed74f2d | 3580 | |
c6b305a8 JB |
3581 | /* Don't re-enter if we're already allocating a chunk */ |
3582 | if (trans->allocating_chunk) | |
3583 | return -ENOSPC; | |
3584 | ||
6324fbf3 | 3585 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3586 | if (!space_info) { |
3587 | ret = update_space_info(extent_root->fs_info, flags, | |
3588 | 0, 0, &space_info); | |
79787eaa | 3589 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3590 | } |
79787eaa | 3591 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3592 | |
6d74119f | 3593 | again: |
25179201 | 3594 | spin_lock(&space_info->lock); |
9e622d6b | 3595 | if (force < space_info->force_alloc) |
0e4f8f88 | 3596 | force = space_info->force_alloc; |
25179201 JB |
3597 | if (space_info->full) { |
3598 | spin_unlock(&space_info->lock); | |
6d74119f | 3599 | return 0; |
9ed74f2d JB |
3600 | } |
3601 | ||
698d0082 | 3602 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3603 | spin_unlock(&space_info->lock); |
6d74119f JB |
3604 | return 0; |
3605 | } else if (space_info->chunk_alloc) { | |
3606 | wait_for_alloc = 1; | |
3607 | } else { | |
3608 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3609 | } |
0e4f8f88 | 3610 | |
25179201 | 3611 | spin_unlock(&space_info->lock); |
9ed74f2d | 3612 | |
6d74119f JB |
3613 | mutex_lock(&fs_info->chunk_mutex); |
3614 | ||
3615 | /* | |
3616 | * The chunk_mutex is held throughout the entirety of a chunk | |
3617 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3618 | * other guy is done and we need to recheck and see if we should | |
3619 | * allocate. | |
3620 | */ | |
3621 | if (wait_for_alloc) { | |
3622 | mutex_unlock(&fs_info->chunk_mutex); | |
3623 | wait_for_alloc = 0; | |
3624 | goto again; | |
3625 | } | |
3626 | ||
c6b305a8 JB |
3627 | trans->allocating_chunk = true; |
3628 | ||
67377734 JB |
3629 | /* |
3630 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3631 | * allocating mixed chunks instead of individual chunks. | |
3632 | */ | |
3633 | if (btrfs_mixed_space_info(space_info)) | |
3634 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3635 | ||
97e728d4 JB |
3636 | /* |
3637 | * if we're doing a data chunk, go ahead and make sure that | |
3638 | * we keep a reasonable number of metadata chunks allocated in the | |
3639 | * FS as well. | |
3640 | */ | |
9ed74f2d | 3641 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3642 | fs_info->data_chunk_allocations++; |
3643 | if (!(fs_info->data_chunk_allocations % | |
3644 | fs_info->metadata_ratio)) | |
3645 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3646 | } |
3647 | ||
15d1ff81 LB |
3648 | /* |
3649 | * Check if we have enough space in SYSTEM chunk because we may need | |
3650 | * to update devices. | |
3651 | */ | |
3652 | check_system_chunk(trans, extent_root, flags); | |
3653 | ||
2b82032c | 3654 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3655 | trans->allocating_chunk = false; |
92b8e897 MF |
3656 | if (ret < 0 && ret != -ENOSPC) |
3657 | goto out; | |
3658 | ||
9ed74f2d | 3659 | spin_lock(&space_info->lock); |
9ed74f2d | 3660 | if (ret) |
6324fbf3 | 3661 | space_info->full = 1; |
424499db YZ |
3662 | else |
3663 | ret = 1; | |
6d74119f | 3664 | |
0e4f8f88 | 3665 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3666 | space_info->chunk_alloc = 0; |
9ed74f2d | 3667 | spin_unlock(&space_info->lock); |
92b8e897 | 3668 | out: |
a25c75d5 | 3669 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3670 | return ret; |
6324fbf3 | 3671 | } |
9ed74f2d | 3672 | |
a80c8dcf JB |
3673 | static int can_overcommit(struct btrfs_root *root, |
3674 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3675 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3676 | { |
96f1bb57 | 3677 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3678 | u64 profile = btrfs_get_alloc_profile(root, 0); |
96f1bb57 | 3679 | u64 rsv_size = 0; |
a80c8dcf JB |
3680 | u64 avail; |
3681 | u64 used; | |
70afa399 | 3682 | u64 to_add; |
a80c8dcf JB |
3683 | |
3684 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3685 | space_info->bytes_pinned + space_info->bytes_readonly; |
3686 | ||
3687 | spin_lock(&global_rsv->lock); | |
3688 | rsv_size = global_rsv->size; | |
3689 | spin_unlock(&global_rsv->lock); | |
3690 | ||
3691 | /* | |
3692 | * We only want to allow over committing if we have lots of actual space | |
3693 | * free, but if we don't have enough space to handle the global reserve | |
3694 | * space then we could end up having a real enospc problem when trying | |
3695 | * to allocate a chunk or some other such important allocation. | |
3696 | */ | |
3697 | rsv_size <<= 1; | |
3698 | if (used + rsv_size >= space_info->total_bytes) | |
3699 | return 0; | |
3700 | ||
3701 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3702 | |
3703 | spin_lock(&root->fs_info->free_chunk_lock); | |
3704 | avail = root->fs_info->free_chunk_space; | |
3705 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3706 | ||
3707 | /* | |
3708 | * If we have dup, raid1 or raid10 then only half of the free | |
3709 | * space is actually useable. | |
3710 | */ | |
3711 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3712 | BTRFS_BLOCK_GROUP_RAID1 | | |
3713 | BTRFS_BLOCK_GROUP_RAID10)) | |
3714 | avail >>= 1; | |
3715 | ||
70afa399 JB |
3716 | to_add = space_info->total_bytes; |
3717 | ||
a80c8dcf | 3718 | /* |
561c294d MX |
3719 | * If we aren't flushing all things, let us overcommit up to |
3720 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3721 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3722 | */ |
08e007d2 | 3723 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
70afa399 | 3724 | to_add >>= 3; |
a80c8dcf | 3725 | else |
70afa399 JB |
3726 | to_add >>= 1; |
3727 | ||
3728 | /* | |
3729 | * Limit the overcommit to the amount of free space we could possibly | |
3730 | * allocate for chunks. | |
3731 | */ | |
3732 | to_add = min(avail, to_add); | |
a80c8dcf | 3733 | |
70afa399 | 3734 | if (used + bytes < space_info->total_bytes + to_add) |
a80c8dcf JB |
3735 | return 1; |
3736 | return 0; | |
3737 | } | |
3738 | ||
da633a42 MX |
3739 | static inline int writeback_inodes_sb_nr_if_idle_safe(struct super_block *sb, |
3740 | unsigned long nr_pages, | |
3741 | enum wb_reason reason) | |
1135d6df | 3742 | { |
da633a42 MX |
3743 | /* the flusher is dealing with the dirty inodes now. */ |
3744 | if (writeback_in_progress(sb->s_bdi)) | |
3745 | return 1; | |
3746 | ||
3747 | if (down_read_trylock(&sb->s_umount)) { | |
1135d6df JB |
3748 | writeback_inodes_sb_nr(sb, nr_pages, reason); |
3749 | up_read(&sb->s_umount); | |
3750 | return 1; | |
3751 | } | |
3752 | ||
3753 | return 0; | |
3754 | } | |
3755 | ||
da633a42 MX |
3756 | void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3757 | unsigned long nr_pages) | |
3758 | { | |
3759 | struct super_block *sb = root->fs_info->sb; | |
3760 | int started; | |
3761 | ||
3762 | /* If we can not start writeback, just sync all the delalloc file. */ | |
3763 | started = writeback_inodes_sb_nr_if_idle_safe(sb, nr_pages, | |
3764 | WB_REASON_FS_FREE_SPACE); | |
3765 | if (!started) { | |
3766 | /* | |
3767 | * We needn't worry the filesystem going from r/w to r/o though | |
3768 | * we don't acquire ->s_umount mutex, because the filesystem | |
3769 | * should guarantee the delalloc inodes list be empty after | |
3770 | * the filesystem is readonly(all dirty pages are written to | |
3771 | * the disk). | |
3772 | */ | |
3773 | btrfs_start_delalloc_inodes(root, 0); | |
3774 | btrfs_wait_ordered_extents(root, 0); | |
3775 | } | |
3776 | } | |
3777 | ||
9ed74f2d | 3778 | /* |
5da9d01b | 3779 | * shrink metadata reservation for delalloc |
9ed74f2d | 3780 | */ |
f4c738c2 JB |
3781 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
3782 | bool wait_ordered) | |
5da9d01b | 3783 | { |
0ca1f7ce | 3784 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3785 | struct btrfs_space_info *space_info; |
663350ac | 3786 | struct btrfs_trans_handle *trans; |
f4c738c2 | 3787 | u64 delalloc_bytes; |
5da9d01b | 3788 | u64 max_reclaim; |
b1953bce | 3789 | long time_left; |
877da174 | 3790 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3791 | int loops = 0; |
08e007d2 | 3792 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 3793 | |
663350ac | 3794 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 3795 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3796 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3797 | |
3798 | smp_mb(); | |
963d678b MX |
3799 | delalloc_bytes = percpu_counter_sum_positive( |
3800 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 3801 | if (delalloc_bytes == 0) { |
fdb5effd | 3802 | if (trans) |
f4c738c2 | 3803 | return; |
6bbe3a9c | 3804 | btrfs_wait_ordered_extents(root, 0); |
f4c738c2 | 3805 | return; |
fdb5effd JB |
3806 | } |
3807 | ||
f4c738c2 JB |
3808 | while (delalloc_bytes && loops < 3) { |
3809 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
3810 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 3811 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
3812 | /* |
3813 | * We need to wait for the async pages to actually start before | |
3814 | * we do anything. | |
3815 | */ | |
3816 | wait_event(root->fs_info->async_submit_wait, | |
3817 | !atomic_read(&root->fs_info->async_delalloc_pages)); | |
3818 | ||
08e007d2 MX |
3819 | if (!trans) |
3820 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
3821 | else | |
3822 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 3823 | spin_lock(&space_info->lock); |
08e007d2 | 3824 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
3825 | spin_unlock(&space_info->lock); |
3826 | break; | |
3827 | } | |
0019f10d | 3828 | spin_unlock(&space_info->lock); |
5da9d01b | 3829 | |
36e39c40 | 3830 | loops++; |
f104d044 | 3831 | if (wait_ordered && !trans) { |
6bbe3a9c | 3832 | btrfs_wait_ordered_extents(root, 0); |
f104d044 | 3833 | } else { |
f4c738c2 | 3834 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
3835 | if (time_left) |
3836 | break; | |
3837 | } | |
f4c738c2 | 3838 | smp_mb(); |
963d678b MX |
3839 | delalloc_bytes = percpu_counter_sum_positive( |
3840 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 3841 | } |
5da9d01b YZ |
3842 | } |
3843 | ||
663350ac JB |
3844 | /** |
3845 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
3846 | * @root - the root we're allocating for | |
3847 | * @bytes - the number of bytes we want to reserve | |
3848 | * @force - force the commit | |
8bb8ab2e | 3849 | * |
663350ac JB |
3850 | * This will check to make sure that committing the transaction will actually |
3851 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
3852 | * will return -ENOSPC. | |
8bb8ab2e | 3853 | */ |
663350ac JB |
3854 | static int may_commit_transaction(struct btrfs_root *root, |
3855 | struct btrfs_space_info *space_info, | |
3856 | u64 bytes, int force) | |
3857 | { | |
3858 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
3859 | struct btrfs_trans_handle *trans; | |
3860 | ||
3861 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
3862 | if (trans) | |
3863 | return -EAGAIN; | |
3864 | ||
3865 | if (force) | |
3866 | goto commit; | |
3867 | ||
3868 | /* See if there is enough pinned space to make this reservation */ | |
3869 | spin_lock(&space_info->lock); | |
3870 | if (space_info->bytes_pinned >= bytes) { | |
3871 | spin_unlock(&space_info->lock); | |
3872 | goto commit; | |
3873 | } | |
3874 | spin_unlock(&space_info->lock); | |
3875 | ||
3876 | /* | |
3877 | * See if there is some space in the delayed insertion reservation for | |
3878 | * this reservation. | |
3879 | */ | |
3880 | if (space_info != delayed_rsv->space_info) | |
3881 | return -ENOSPC; | |
3882 | ||
d9b0218f | 3883 | spin_lock(&space_info->lock); |
663350ac | 3884 | spin_lock(&delayed_rsv->lock); |
d9b0218f | 3885 | if (space_info->bytes_pinned + delayed_rsv->size < bytes) { |
663350ac | 3886 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 3887 | spin_unlock(&space_info->lock); |
663350ac JB |
3888 | return -ENOSPC; |
3889 | } | |
3890 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 3891 | spin_unlock(&space_info->lock); |
663350ac JB |
3892 | |
3893 | commit: | |
3894 | trans = btrfs_join_transaction(root); | |
3895 | if (IS_ERR(trans)) | |
3896 | return -ENOSPC; | |
3897 | ||
3898 | return btrfs_commit_transaction(trans, root); | |
3899 | } | |
3900 | ||
96c3f433 | 3901 | enum flush_state { |
67b0fd63 JB |
3902 | FLUSH_DELAYED_ITEMS_NR = 1, |
3903 | FLUSH_DELAYED_ITEMS = 2, | |
3904 | FLUSH_DELALLOC = 3, | |
3905 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
3906 | ALLOC_CHUNK = 5, |
3907 | COMMIT_TRANS = 6, | |
96c3f433 JB |
3908 | }; |
3909 | ||
3910 | static int flush_space(struct btrfs_root *root, | |
3911 | struct btrfs_space_info *space_info, u64 num_bytes, | |
3912 | u64 orig_bytes, int state) | |
3913 | { | |
3914 | struct btrfs_trans_handle *trans; | |
3915 | int nr; | |
f4c738c2 | 3916 | int ret = 0; |
96c3f433 JB |
3917 | |
3918 | switch (state) { | |
96c3f433 JB |
3919 | case FLUSH_DELAYED_ITEMS_NR: |
3920 | case FLUSH_DELAYED_ITEMS: | |
3921 | if (state == FLUSH_DELAYED_ITEMS_NR) { | |
3922 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); | |
3923 | ||
3924 | nr = (int)div64_u64(num_bytes, bytes); | |
3925 | if (!nr) | |
3926 | nr = 1; | |
3927 | nr *= 2; | |
3928 | } else { | |
3929 | nr = -1; | |
3930 | } | |
3931 | trans = btrfs_join_transaction(root); | |
3932 | if (IS_ERR(trans)) { | |
3933 | ret = PTR_ERR(trans); | |
3934 | break; | |
3935 | } | |
3936 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
3937 | btrfs_end_transaction(trans, root); | |
3938 | break; | |
67b0fd63 JB |
3939 | case FLUSH_DELALLOC: |
3940 | case FLUSH_DELALLOC_WAIT: | |
3941 | shrink_delalloc(root, num_bytes, orig_bytes, | |
3942 | state == FLUSH_DELALLOC_WAIT); | |
3943 | break; | |
ea658bad JB |
3944 | case ALLOC_CHUNK: |
3945 | trans = btrfs_join_transaction(root); | |
3946 | if (IS_ERR(trans)) { | |
3947 | ret = PTR_ERR(trans); | |
3948 | break; | |
3949 | } | |
3950 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
3951 | btrfs_get_alloc_profile(root, 0), |
3952 | CHUNK_ALLOC_NO_FORCE); | |
3953 | btrfs_end_transaction(trans, root); | |
3954 | if (ret == -ENOSPC) | |
3955 | ret = 0; | |
3956 | break; | |
96c3f433 JB |
3957 | case COMMIT_TRANS: |
3958 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
3959 | break; | |
3960 | default: | |
3961 | ret = -ENOSPC; | |
3962 | break; | |
3963 | } | |
3964 | ||
3965 | return ret; | |
3966 | } | |
4a92b1b8 JB |
3967 | /** |
3968 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
3969 | * @root - the root we're allocating for | |
3970 | * @block_rsv - the block_rsv we're allocating for | |
3971 | * @orig_bytes - the number of bytes we want | |
3972 | * @flush - wether or not we can flush to make our reservation | |
8bb8ab2e | 3973 | * |
4a92b1b8 JB |
3974 | * This will reserve orgi_bytes number of bytes from the space info associated |
3975 | * with the block_rsv. If there is not enough space it will make an attempt to | |
3976 | * flush out space to make room. It will do this by flushing delalloc if | |
3977 | * possible or committing the transaction. If flush is 0 then no attempts to | |
3978 | * regain reservations will be made and this will fail if there is not enough | |
3979 | * space already. | |
8bb8ab2e | 3980 | */ |
4a92b1b8 | 3981 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 3982 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
3983 | u64 orig_bytes, |
3984 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 3985 | { |
f0486c68 | 3986 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 3987 | u64 used; |
8bb8ab2e | 3988 | u64 num_bytes = orig_bytes; |
67b0fd63 | 3989 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 3990 | int ret = 0; |
fdb5effd | 3991 | bool flushing = false; |
9ed74f2d | 3992 | |
8bb8ab2e | 3993 | again: |
fdb5effd | 3994 | ret = 0; |
8bb8ab2e | 3995 | spin_lock(&space_info->lock); |
fdb5effd | 3996 | /* |
08e007d2 MX |
3997 | * We only want to wait if somebody other than us is flushing and we |
3998 | * are actually allowed to flush all things. | |
fdb5effd | 3999 | */ |
08e007d2 MX |
4000 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4001 | space_info->flush) { | |
fdb5effd JB |
4002 | spin_unlock(&space_info->lock); |
4003 | /* | |
4004 | * If we have a trans handle we can't wait because the flusher | |
4005 | * may have to commit the transaction, which would mean we would | |
4006 | * deadlock since we are waiting for the flusher to finish, but | |
4007 | * hold the current transaction open. | |
4008 | */ | |
663350ac | 4009 | if (current->journal_info) |
fdb5effd | 4010 | return -EAGAIN; |
b9688bb8 AJ |
4011 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4012 | /* Must have been killed, return */ | |
4013 | if (ret) | |
fdb5effd JB |
4014 | return -EINTR; |
4015 | ||
4016 | spin_lock(&space_info->lock); | |
4017 | } | |
4018 | ||
4019 | ret = -ENOSPC; | |
2bf64758 JB |
4020 | used = space_info->bytes_used + space_info->bytes_reserved + |
4021 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4022 | space_info->bytes_may_use; | |
9ed74f2d | 4023 | |
8bb8ab2e JB |
4024 | /* |
4025 | * The idea here is that we've not already over-reserved the block group | |
4026 | * then we can go ahead and save our reservation first and then start | |
4027 | * flushing if we need to. Otherwise if we've already overcommitted | |
4028 | * lets start flushing stuff first and then come back and try to make | |
4029 | * our reservation. | |
4030 | */ | |
2bf64758 JB |
4031 | if (used <= space_info->total_bytes) { |
4032 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4033 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4034 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4035 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4036 | ret = 0; |
4037 | } else { | |
4038 | /* | |
4039 | * Ok set num_bytes to orig_bytes since we aren't | |
4040 | * overocmmitted, this way we only try and reclaim what | |
4041 | * we need. | |
4042 | */ | |
4043 | num_bytes = orig_bytes; | |
4044 | } | |
4045 | } else { | |
4046 | /* | |
4047 | * Ok we're over committed, set num_bytes to the overcommitted | |
4048 | * amount plus the amount of bytes that we need for this | |
4049 | * reservation. | |
4050 | */ | |
2bf64758 | 4051 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4052 | (orig_bytes * 2); |
8bb8ab2e | 4053 | } |
9ed74f2d | 4054 | |
44734ed1 JB |
4055 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4056 | space_info->bytes_may_use += orig_bytes; | |
4057 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4058 | space_info->flags, orig_bytes, | |
4059 | 1); | |
4060 | ret = 0; | |
2bf64758 JB |
4061 | } |
4062 | ||
8bb8ab2e JB |
4063 | /* |
4064 | * Couldn't make our reservation, save our place so while we're trying | |
4065 | * to reclaim space we can actually use it instead of somebody else | |
4066 | * stealing it from us. | |
08e007d2 MX |
4067 | * |
4068 | * We make the other tasks wait for the flush only when we can flush | |
4069 | * all things. | |
8bb8ab2e | 4070 | */ |
72bcd99d | 4071 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4072 | flushing = true; |
4073 | space_info->flush = 1; | |
8bb8ab2e | 4074 | } |
9ed74f2d | 4075 | |
f0486c68 | 4076 | spin_unlock(&space_info->lock); |
9ed74f2d | 4077 | |
08e007d2 | 4078 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4079 | goto out; |
f0486c68 | 4080 | |
96c3f433 JB |
4081 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4082 | flush_state); | |
4083 | flush_state++; | |
08e007d2 MX |
4084 | |
4085 | /* | |
4086 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4087 | * would happen. So skip delalloc flush. | |
4088 | */ | |
4089 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4090 | (flush_state == FLUSH_DELALLOC || | |
4091 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4092 | flush_state = ALLOC_CHUNK; | |
4093 | ||
96c3f433 | 4094 | if (!ret) |
8bb8ab2e | 4095 | goto again; |
08e007d2 MX |
4096 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4097 | flush_state < COMMIT_TRANS) | |
4098 | goto again; | |
4099 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4100 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4101 | goto again; |
4102 | ||
4103 | out: | |
5d80366e JB |
4104 | if (ret == -ENOSPC && |
4105 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4106 | struct btrfs_block_rsv *global_rsv = | |
4107 | &root->fs_info->global_block_rsv; | |
4108 | ||
4109 | if (block_rsv != global_rsv && | |
4110 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4111 | ret = 0; | |
4112 | } | |
fdb5effd | 4113 | if (flushing) { |
8bb8ab2e | 4114 | spin_lock(&space_info->lock); |
fdb5effd JB |
4115 | space_info->flush = 0; |
4116 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4117 | spin_unlock(&space_info->lock); |
f0486c68 | 4118 | } |
f0486c68 YZ |
4119 | return ret; |
4120 | } | |
4121 | ||
79787eaa JM |
4122 | static struct btrfs_block_rsv *get_block_rsv( |
4123 | const struct btrfs_trans_handle *trans, | |
4124 | const struct btrfs_root *root) | |
f0486c68 | 4125 | { |
4c13d758 JB |
4126 | struct btrfs_block_rsv *block_rsv = NULL; |
4127 | ||
0e721106 JB |
4128 | if (root->ref_cows) |
4129 | block_rsv = trans->block_rsv; | |
4130 | ||
4131 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4132 | block_rsv = trans->block_rsv; |
4c13d758 JB |
4133 | |
4134 | if (!block_rsv) | |
f0486c68 YZ |
4135 | block_rsv = root->block_rsv; |
4136 | ||
4137 | if (!block_rsv) | |
4138 | block_rsv = &root->fs_info->empty_block_rsv; | |
4139 | ||
4140 | return block_rsv; | |
4141 | } | |
4142 | ||
4143 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4144 | u64 num_bytes) | |
4145 | { | |
4146 | int ret = -ENOSPC; | |
4147 | spin_lock(&block_rsv->lock); | |
4148 | if (block_rsv->reserved >= num_bytes) { | |
4149 | block_rsv->reserved -= num_bytes; | |
4150 | if (block_rsv->reserved < block_rsv->size) | |
4151 | block_rsv->full = 0; | |
4152 | ret = 0; | |
4153 | } | |
4154 | spin_unlock(&block_rsv->lock); | |
4155 | return ret; | |
4156 | } | |
4157 | ||
4158 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4159 | u64 num_bytes, int update_size) | |
4160 | { | |
4161 | spin_lock(&block_rsv->lock); | |
4162 | block_rsv->reserved += num_bytes; | |
4163 | if (update_size) | |
4164 | block_rsv->size += num_bytes; | |
4165 | else if (block_rsv->reserved >= block_rsv->size) | |
4166 | block_rsv->full = 1; | |
4167 | spin_unlock(&block_rsv->lock); | |
4168 | } | |
4169 | ||
8c2a3ca2 JB |
4170 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4171 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4172 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4173 | { |
4174 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4175 | ||
4176 | spin_lock(&block_rsv->lock); | |
4177 | if (num_bytes == (u64)-1) | |
4178 | num_bytes = block_rsv->size; | |
4179 | block_rsv->size -= num_bytes; | |
4180 | if (block_rsv->reserved >= block_rsv->size) { | |
4181 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4182 | block_rsv->reserved = block_rsv->size; | |
4183 | block_rsv->full = 1; | |
4184 | } else { | |
4185 | num_bytes = 0; | |
4186 | } | |
4187 | spin_unlock(&block_rsv->lock); | |
4188 | ||
4189 | if (num_bytes > 0) { | |
4190 | if (dest) { | |
e9e22899 JB |
4191 | spin_lock(&dest->lock); |
4192 | if (!dest->full) { | |
4193 | u64 bytes_to_add; | |
4194 | ||
4195 | bytes_to_add = dest->size - dest->reserved; | |
4196 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4197 | dest->reserved += bytes_to_add; | |
4198 | if (dest->reserved >= dest->size) | |
4199 | dest->full = 1; | |
4200 | num_bytes -= bytes_to_add; | |
4201 | } | |
4202 | spin_unlock(&dest->lock); | |
4203 | } | |
4204 | if (num_bytes) { | |
f0486c68 | 4205 | spin_lock(&space_info->lock); |
fb25e914 | 4206 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4207 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4208 | space_info->flags, num_bytes, 0); |
36e39c40 | 4209 | space_info->reservation_progress++; |
f0486c68 | 4210 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4211 | } |
9ed74f2d | 4212 | } |
f0486c68 | 4213 | } |
4e06bdd6 | 4214 | |
f0486c68 YZ |
4215 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4216 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4217 | { | |
4218 | int ret; | |
9ed74f2d | 4219 | |
f0486c68 YZ |
4220 | ret = block_rsv_use_bytes(src, num_bytes); |
4221 | if (ret) | |
4222 | return ret; | |
9ed74f2d | 4223 | |
f0486c68 | 4224 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4225 | return 0; |
4226 | } | |
4227 | ||
66d8f3dd | 4228 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4229 | { |
f0486c68 YZ |
4230 | memset(rsv, 0, sizeof(*rsv)); |
4231 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4232 | rsv->type = type; |
f0486c68 YZ |
4233 | } |
4234 | ||
66d8f3dd MX |
4235 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4236 | unsigned short type) | |
f0486c68 YZ |
4237 | { |
4238 | struct btrfs_block_rsv *block_rsv; | |
4239 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4240 | |
f0486c68 YZ |
4241 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4242 | if (!block_rsv) | |
4243 | return NULL; | |
9ed74f2d | 4244 | |
66d8f3dd | 4245 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4246 | block_rsv->space_info = __find_space_info(fs_info, |
4247 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4248 | return block_rsv; |
4249 | } | |
9ed74f2d | 4250 | |
f0486c68 YZ |
4251 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4252 | struct btrfs_block_rsv *rsv) | |
4253 | { | |
2aaa6655 JB |
4254 | if (!rsv) |
4255 | return; | |
dabdb640 JB |
4256 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4257 | kfree(rsv); | |
9ed74f2d JB |
4258 | } |
4259 | ||
08e007d2 MX |
4260 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4261 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4262 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4263 | { |
f0486c68 | 4264 | int ret; |
9ed74f2d | 4265 | |
f0486c68 YZ |
4266 | if (num_bytes == 0) |
4267 | return 0; | |
8bb8ab2e | 4268 | |
61b520a9 | 4269 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4270 | if (!ret) { |
4271 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4272 | return 0; | |
4273 | } | |
9ed74f2d | 4274 | |
f0486c68 | 4275 | return ret; |
f0486c68 | 4276 | } |
9ed74f2d | 4277 | |
4a92b1b8 | 4278 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4279 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4280 | { |
4281 | u64 num_bytes = 0; | |
f0486c68 | 4282 | int ret = -ENOSPC; |
9ed74f2d | 4283 | |
f0486c68 YZ |
4284 | if (!block_rsv) |
4285 | return 0; | |
9ed74f2d | 4286 | |
f0486c68 | 4287 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4288 | num_bytes = div_factor(block_rsv->size, min_factor); |
4289 | if (block_rsv->reserved >= num_bytes) | |
4290 | ret = 0; | |
4291 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4292 | |
36ba022a JB |
4293 | return ret; |
4294 | } | |
4295 | ||
08e007d2 MX |
4296 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4297 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4298 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4299 | { |
4300 | u64 num_bytes = 0; | |
4301 | int ret = -ENOSPC; | |
4302 | ||
4303 | if (!block_rsv) | |
4304 | return 0; | |
4305 | ||
4306 | spin_lock(&block_rsv->lock); | |
4307 | num_bytes = min_reserved; | |
13553e52 | 4308 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4309 | ret = 0; |
13553e52 | 4310 | else |
f0486c68 | 4311 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4312 | spin_unlock(&block_rsv->lock); |
13553e52 | 4313 | |
f0486c68 YZ |
4314 | if (!ret) |
4315 | return 0; | |
4316 | ||
aa38a711 | 4317 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4318 | if (!ret) { |
4319 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4320 | return 0; |
6a63209f | 4321 | } |
9ed74f2d | 4322 | |
13553e52 | 4323 | return ret; |
f0486c68 YZ |
4324 | } |
4325 | ||
4326 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4327 | struct btrfs_block_rsv *dst_rsv, | |
4328 | u64 num_bytes) | |
4329 | { | |
4330 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4331 | } | |
4332 | ||
4333 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4334 | struct btrfs_block_rsv *block_rsv, | |
4335 | u64 num_bytes) | |
4336 | { | |
4337 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4338 | if (global_rsv->full || global_rsv == block_rsv || | |
4339 | block_rsv->space_info != global_rsv->space_info) | |
4340 | global_rsv = NULL; | |
8c2a3ca2 JB |
4341 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4342 | num_bytes); | |
6a63209f JB |
4343 | } |
4344 | ||
4345 | /* | |
8929ecfa YZ |
4346 | * helper to calculate size of global block reservation. |
4347 | * the desired value is sum of space used by extent tree, | |
4348 | * checksum tree and root tree | |
6a63209f | 4349 | */ |
8929ecfa | 4350 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4351 | { |
8929ecfa YZ |
4352 | struct btrfs_space_info *sinfo; |
4353 | u64 num_bytes; | |
4354 | u64 meta_used; | |
4355 | u64 data_used; | |
6c41761f | 4356 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4357 | |
8929ecfa YZ |
4358 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4359 | spin_lock(&sinfo->lock); | |
4360 | data_used = sinfo->bytes_used; | |
4361 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4362 | |
8929ecfa YZ |
4363 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4364 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4365 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4366 | data_used = 0; | |
8929ecfa YZ |
4367 | meta_used = sinfo->bytes_used; |
4368 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4369 | |
8929ecfa YZ |
4370 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4371 | csum_size * 2; | |
4372 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4373 | |
8929ecfa | 4374 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4375 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4376 | |
8929ecfa YZ |
4377 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4378 | } | |
6a63209f | 4379 | |
8929ecfa YZ |
4380 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4381 | { | |
4382 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4383 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4384 | u64 num_bytes; | |
6a63209f | 4385 | |
8929ecfa | 4386 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4387 | |
8929ecfa | 4388 | spin_lock(&sinfo->lock); |
1f699d38 | 4389 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4390 | |
8929ecfa | 4391 | block_rsv->size = num_bytes; |
4e06bdd6 | 4392 | |
8929ecfa | 4393 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4394 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4395 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4396 | |
4397 | if (sinfo->total_bytes > num_bytes) { | |
4398 | num_bytes = sinfo->total_bytes - num_bytes; | |
4399 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4400 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4401 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4402 | sinfo->flags, num_bytes, 1); |
6a63209f | 4403 | } |
6a63209f | 4404 | |
8929ecfa YZ |
4405 | if (block_rsv->reserved >= block_rsv->size) { |
4406 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4407 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4408 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4409 | sinfo->flags, num_bytes, 0); |
36e39c40 | 4410 | sinfo->reservation_progress++; |
8929ecfa YZ |
4411 | block_rsv->reserved = block_rsv->size; |
4412 | block_rsv->full = 1; | |
4413 | } | |
182608c8 | 4414 | |
8929ecfa | 4415 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4416 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4417 | } |
4418 | ||
f0486c68 | 4419 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4420 | { |
f0486c68 | 4421 | struct btrfs_space_info *space_info; |
6a63209f | 4422 | |
f0486c68 YZ |
4423 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4424 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4425 | |
f0486c68 | 4426 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4427 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4428 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4429 | fs_info->trans_block_rsv.space_info = space_info; |
4430 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4431 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4432 | |
8929ecfa YZ |
4433 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4434 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4435 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4436 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4437 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4438 | |
8929ecfa | 4439 | update_global_block_rsv(fs_info); |
6a63209f JB |
4440 | } |
4441 | ||
8929ecfa | 4442 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4443 | { |
8c2a3ca2 JB |
4444 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4445 | (u64)-1); | |
8929ecfa YZ |
4446 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4447 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4448 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4449 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4450 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4451 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4452 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4453 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4454 | } |
4455 | ||
a22285a6 YZ |
4456 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4457 | struct btrfs_root *root) | |
6a63209f | 4458 | { |
0e721106 JB |
4459 | if (!trans->block_rsv) |
4460 | return; | |
4461 | ||
a22285a6 YZ |
4462 | if (!trans->bytes_reserved) |
4463 | return; | |
6a63209f | 4464 | |
e77266e4 | 4465 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4466 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4467 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4468 | trans->bytes_reserved = 0; |
4469 | } | |
6a63209f | 4470 | |
79787eaa | 4471 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4472 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4473 | struct inode *inode) | |
4474 | { | |
4475 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4476 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4477 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4478 | ||
4479 | /* | |
fcb80c2a JB |
4480 | * We need to hold space in order to delete our orphan item once we've |
4481 | * added it, so this takes the reservation so we can release it later | |
4482 | * when we are truly done with the orphan item. | |
d68fc57b | 4483 | */ |
ff5714cc | 4484 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4485 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4486 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4487 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4488 | } |
4489 | ||
d68fc57b | 4490 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4491 | { |
d68fc57b | 4492 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4493 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4494 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4495 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4496 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4497 | } | |
97e728d4 | 4498 | |
a22285a6 YZ |
4499 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
4500 | struct btrfs_pending_snapshot *pending) | |
4501 | { | |
4502 | struct btrfs_root *root = pending->root; | |
4503 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4504 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
4505 | /* | |
48c03c4b MX |
4506 | * two for root back/forward refs, two for directory entries, |
4507 | * one for root of the snapshot and one for parent inode. | |
a22285a6 | 4508 | */ |
48c03c4b | 4509 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 6); |
a22285a6 YZ |
4510 | dst_rsv->space_info = src_rsv->space_info; |
4511 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
4512 | } |
4513 | ||
7709cde3 JB |
4514 | /** |
4515 | * drop_outstanding_extent - drop an outstanding extent | |
4516 | * @inode: the inode we're dropping the extent for | |
4517 | * | |
4518 | * This is called when we are freeing up an outstanding extent, either called | |
4519 | * after an error or after an extent is written. This will return the number of | |
4520 | * reserved extents that need to be freed. This must be called with | |
4521 | * BTRFS_I(inode)->lock held. | |
4522 | */ | |
9e0baf60 JB |
4523 | static unsigned drop_outstanding_extent(struct inode *inode) |
4524 | { | |
7fd2ae21 | 4525 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4526 | unsigned dropped_extents = 0; |
4527 | ||
9e0baf60 JB |
4528 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4529 | BTRFS_I(inode)->outstanding_extents--; | |
4530 | ||
7fd2ae21 | 4531 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4532 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4533 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4534 | drop_inode_space = 1; |
7fd2ae21 | 4535 | |
9e0baf60 JB |
4536 | /* |
4537 | * If we have more or the same amount of outsanding extents than we have | |
4538 | * reserved then we need to leave the reserved extents count alone. | |
4539 | */ | |
4540 | if (BTRFS_I(inode)->outstanding_extents >= | |
4541 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4542 | return drop_inode_space; |
9e0baf60 JB |
4543 | |
4544 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4545 | BTRFS_I(inode)->outstanding_extents; | |
4546 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4547 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4548 | } |
4549 | ||
7709cde3 JB |
4550 | /** |
4551 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4552 | * reserved/free'd for the given bytes. | |
4553 | * @inode: the inode we're manipulating | |
4554 | * @num_bytes: the number of bytes in question | |
4555 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4556 | * | |
4557 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4558 | * correct amount of metadata that must either be reserved or freed. We | |
4559 | * calculate how many checksums we can fit into one leaf and then divide the | |
4560 | * number of bytes that will need to be checksumed by this value to figure out | |
4561 | * how many checksums will be required. If we are adding bytes then the number | |
4562 | * may go up and we will return the number of additional bytes that must be | |
4563 | * reserved. If it is going down we will return the number of bytes that must | |
4564 | * be freed. | |
4565 | * | |
4566 | * This must be called with BTRFS_I(inode)->lock held. | |
4567 | */ | |
4568 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4569 | int reserve) | |
6324fbf3 | 4570 | { |
7709cde3 JB |
4571 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4572 | u64 csum_size; | |
4573 | int num_csums_per_leaf; | |
4574 | int num_csums; | |
4575 | int old_csums; | |
4576 | ||
4577 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4578 | BTRFS_I(inode)->csum_bytes == 0) | |
4579 | return 0; | |
4580 | ||
4581 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4582 | if (reserve) | |
4583 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4584 | else | |
4585 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4586 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4587 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4588 | sizeof(struct btrfs_csum_item) + | |
4589 | sizeof(struct btrfs_disk_key)); | |
4590 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4591 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4592 | num_csums = num_csums / num_csums_per_leaf; | |
4593 | ||
4594 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4595 | old_csums = old_csums / num_csums_per_leaf; | |
4596 | ||
4597 | /* No change, no need to reserve more */ | |
4598 | if (old_csums == num_csums) | |
4599 | return 0; | |
4600 | ||
4601 | if (reserve) | |
4602 | return btrfs_calc_trans_metadata_size(root, | |
4603 | num_csums - old_csums); | |
4604 | ||
4605 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4606 | } |
c146afad | 4607 | |
0ca1f7ce YZ |
4608 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4609 | { | |
4610 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4611 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4612 | u64 to_reserve = 0; |
660d3f6c | 4613 | u64 csum_bytes; |
9e0baf60 | 4614 | unsigned nr_extents = 0; |
660d3f6c | 4615 | int extra_reserve = 0; |
08e007d2 | 4616 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4617 | int ret = 0; |
c64c2bd8 | 4618 | bool delalloc_lock = true; |
6324fbf3 | 4619 | |
c64c2bd8 JB |
4620 | /* If we are a free space inode we need to not flush since we will be in |
4621 | * the middle of a transaction commit. We also don't need the delalloc | |
4622 | * mutex since we won't race with anybody. We need this mostly to make | |
4623 | * lockdep shut its filthy mouth. | |
4624 | */ | |
4625 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4626 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4627 | delalloc_lock = false; |
4628 | } | |
c09544e0 | 4629 | |
08e007d2 MX |
4630 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4631 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4632 | schedule_timeout(1); |
ec44a35c | 4633 | |
c64c2bd8 JB |
4634 | if (delalloc_lock) |
4635 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4636 | ||
0ca1f7ce | 4637 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4638 | |
9e0baf60 JB |
4639 | spin_lock(&BTRFS_I(inode)->lock); |
4640 | BTRFS_I(inode)->outstanding_extents++; | |
4641 | ||
4642 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4643 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4644 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4645 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4646 | |
7fd2ae21 JB |
4647 | /* |
4648 | * Add an item to reserve for updating the inode when we complete the | |
4649 | * delalloc io. | |
4650 | */ | |
72ac3c0d JB |
4651 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4652 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4653 | nr_extents++; |
660d3f6c | 4654 | extra_reserve = 1; |
593060d7 | 4655 | } |
7fd2ae21 JB |
4656 | |
4657 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4658 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4659 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4660 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4661 | |
eb6b88d9 | 4662 | if (root->fs_info->quota_enabled) |
c5567237 AJ |
4663 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4664 | nr_extents * root->leafsize); | |
c5567237 | 4665 | |
eb6b88d9 JS |
4666 | /* |
4667 | * ret != 0 here means the qgroup reservation failed, we go straight to | |
4668 | * the shared error handling then. | |
4669 | */ | |
4670 | if (ret == 0) | |
4671 | ret = reserve_metadata_bytes(root, block_rsv, | |
4672 | to_reserve, flush); | |
4673 | ||
9e0baf60 | 4674 | if (ret) { |
7ed49f18 | 4675 | u64 to_free = 0; |
9e0baf60 | 4676 | unsigned dropped; |
7ed49f18 | 4677 | |
7709cde3 | 4678 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4679 | dropped = drop_outstanding_extent(inode); |
9e0baf60 | 4680 | /* |
660d3f6c JB |
4681 | * If the inodes csum_bytes is the same as the original |
4682 | * csum_bytes then we know we haven't raced with any free()ers | |
4683 | * so we can just reduce our inodes csum bytes and carry on. | |
4684 | * Otherwise we have to do the normal free thing to account for | |
4685 | * the case that the free side didn't free up its reserve | |
4686 | * because of this outstanding reservation. | |
9e0baf60 | 4687 | */ |
660d3f6c JB |
4688 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) |
4689 | calc_csum_metadata_size(inode, num_bytes, 0); | |
4690 | else | |
4691 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
4692 | spin_unlock(&BTRFS_I(inode)->lock); | |
4693 | if (dropped) | |
4694 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
4695 | ||
8c2a3ca2 | 4696 | if (to_free) { |
7ed49f18 | 4697 | btrfs_block_rsv_release(root, block_rsv, to_free); |
8c2a3ca2 JB |
4698 | trace_btrfs_space_reservation(root->fs_info, |
4699 | "delalloc", | |
4700 | btrfs_ino(inode), | |
4701 | to_free, 0); | |
4702 | } | |
4b5829a8 MX |
4703 | if (root->fs_info->quota_enabled) { |
4704 | btrfs_qgroup_free(root, num_bytes + | |
4705 | nr_extents * root->leafsize); | |
4706 | } | |
c64c2bd8 JB |
4707 | if (delalloc_lock) |
4708 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
0ca1f7ce | 4709 | return ret; |
9e0baf60 | 4710 | } |
25179201 | 4711 | |
660d3f6c JB |
4712 | spin_lock(&BTRFS_I(inode)->lock); |
4713 | if (extra_reserve) { | |
72ac3c0d JB |
4714 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4715 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
4716 | nr_extents--; |
4717 | } | |
4718 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4719 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
4720 | |
4721 | if (delalloc_lock) | |
4722 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 4723 | |
8c2a3ca2 JB |
4724 | if (to_reserve) |
4725 | trace_btrfs_space_reservation(root->fs_info,"delalloc", | |
4726 | btrfs_ino(inode), to_reserve, 1); | |
0ca1f7ce YZ |
4727 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4728 | ||
0ca1f7ce YZ |
4729 | return 0; |
4730 | } | |
4731 | ||
7709cde3 JB |
4732 | /** |
4733 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
4734 | * @inode: the inode to release the reservation for | |
4735 | * @num_bytes: the number of bytes we're releasing | |
4736 | * | |
4737 | * This will release the metadata reservation for an inode. This can be called | |
4738 | * once we complete IO for a given set of bytes to release their metadata | |
4739 | * reservations. | |
4740 | */ | |
0ca1f7ce YZ |
4741 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
4742 | { | |
4743 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
4744 | u64 to_free = 0; |
4745 | unsigned dropped; | |
0ca1f7ce YZ |
4746 | |
4747 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 4748 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4749 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 4750 | |
0934856d MX |
4751 | if (num_bytes) |
4752 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 4753 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
4754 | if (dropped > 0) |
4755 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 4756 | |
8c2a3ca2 JB |
4757 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
4758 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
4759 | if (root->fs_info->quota_enabled) { |
4760 | btrfs_qgroup_free(root, num_bytes + | |
4761 | dropped * root->leafsize); | |
4762 | } | |
4763 | ||
0ca1f7ce YZ |
4764 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
4765 | to_free); | |
4766 | } | |
4767 | ||
7709cde3 JB |
4768 | /** |
4769 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
4770 | * @inode: inode we're writing to | |
4771 | * @num_bytes: the number of bytes we want to allocate | |
4772 | * | |
4773 | * This will do the following things | |
4774 | * | |
4775 | * o reserve space in the data space info for num_bytes | |
4776 | * o reserve space in the metadata space info based on number of outstanding | |
4777 | * extents and how much csums will be needed | |
4778 | * o add to the inodes ->delalloc_bytes | |
4779 | * o add it to the fs_info's delalloc inodes list. | |
4780 | * | |
4781 | * This will return 0 for success and -ENOSPC if there is no space left. | |
4782 | */ | |
0ca1f7ce YZ |
4783 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
4784 | { | |
4785 | int ret; | |
4786 | ||
4787 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4788 | if (ret) |
0ca1f7ce YZ |
4789 | return ret; |
4790 | ||
4791 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4792 | if (ret) { | |
4793 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4794 | return ret; | |
4795 | } | |
4796 | ||
4797 | return 0; | |
4798 | } | |
4799 | ||
7709cde3 JB |
4800 | /** |
4801 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
4802 | * @inode: inode we're releasing space for | |
4803 | * @num_bytes: the number of bytes we want to free up | |
4804 | * | |
4805 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
4806 | * called in the case that we don't need the metadata AND data reservations | |
4807 | * anymore. So if there is an error or we insert an inline extent. | |
4808 | * | |
4809 | * This function will release the metadata space that was not used and will | |
4810 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
4811 | * list if there are no delalloc bytes left. | |
4812 | */ | |
0ca1f7ce YZ |
4813 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
4814 | { | |
4815 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4816 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4817 | } |
4818 | ||
c53d613e | 4819 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 4820 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4821 | { |
0af3d00b | 4822 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4823 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4824 | u64 total = num_bytes; |
9078a3e1 | 4825 | u64 old_val; |
db94535d | 4826 | u64 byte_in_group; |
0af3d00b | 4827 | int factor; |
3e1ad54f | 4828 | |
5d4f98a2 YZ |
4829 | /* block accounting for super block */ |
4830 | spin_lock(&info->delalloc_lock); | |
6c41761f | 4831 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
4832 | if (alloc) |
4833 | old_val += num_bytes; | |
4834 | else | |
4835 | old_val -= num_bytes; | |
6c41761f | 4836 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
5d4f98a2 YZ |
4837 | spin_unlock(&info->delalloc_lock); |
4838 | ||
d397712b | 4839 | while (total) { |
db94535d | 4840 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4841 | if (!cache) |
79787eaa | 4842 | return -ENOENT; |
b742bb82 YZ |
4843 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4844 | BTRFS_BLOCK_GROUP_RAID1 | | |
4845 | BTRFS_BLOCK_GROUP_RAID10)) | |
4846 | factor = 2; | |
4847 | else | |
4848 | factor = 1; | |
9d66e233 JB |
4849 | /* |
4850 | * If this block group has free space cache written out, we | |
4851 | * need to make sure to load it if we are removing space. This | |
4852 | * is because we need the unpinning stage to actually add the | |
4853 | * space back to the block group, otherwise we will leak space. | |
4854 | */ | |
4855 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 4856 | cache_block_group(cache, 1); |
0af3d00b | 4857 | |
db94535d CM |
4858 | byte_in_group = bytenr - cache->key.objectid; |
4859 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4860 | |
25179201 | 4861 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4862 | spin_lock(&cache->lock); |
0af3d00b | 4863 | |
73bc1876 | 4864 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
4865 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
4866 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4867 | ||
0f9dd46c | 4868 | cache->dirty = 1; |
9078a3e1 | 4869 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4870 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4871 | if (alloc) { |
db94535d | 4872 | old_val += num_bytes; |
11833d66 YZ |
4873 | btrfs_set_block_group_used(&cache->item, old_val); |
4874 | cache->reserved -= num_bytes; | |
11833d66 | 4875 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
4876 | cache->space_info->bytes_used += num_bytes; |
4877 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4878 | spin_unlock(&cache->lock); |
25179201 | 4879 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4880 | } else { |
db94535d | 4881 | old_val -= num_bytes; |
c286ac48 | 4882 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4883 | cache->pinned += num_bytes; |
4884 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4885 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4886 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4887 | spin_unlock(&cache->lock); |
25179201 | 4888 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4889 | |
f0486c68 YZ |
4890 | set_extent_dirty(info->pinned_extents, |
4891 | bytenr, bytenr + num_bytes - 1, | |
4892 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4893 | } |
fa9c0d79 | 4894 | btrfs_put_block_group(cache); |
db94535d CM |
4895 | total -= num_bytes; |
4896 | bytenr += num_bytes; | |
9078a3e1 CM |
4897 | } |
4898 | return 0; | |
4899 | } | |
6324fbf3 | 4900 | |
a061fc8d CM |
4901 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4902 | { | |
0f9dd46c | 4903 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4904 | u64 bytenr; |
0f9dd46c | 4905 | |
a1897fdd LB |
4906 | spin_lock(&root->fs_info->block_group_cache_lock); |
4907 | bytenr = root->fs_info->first_logical_byte; | |
4908 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
4909 | ||
4910 | if (bytenr < (u64)-1) | |
4911 | return bytenr; | |
4912 | ||
0f9dd46c JB |
4913 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
4914 | if (!cache) | |
a061fc8d | 4915 | return 0; |
0f9dd46c | 4916 | |
d2fb3437 | 4917 | bytenr = cache->key.objectid; |
fa9c0d79 | 4918 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4919 | |
4920 | return bytenr; | |
a061fc8d CM |
4921 | } |
4922 | ||
f0486c68 YZ |
4923 | static int pin_down_extent(struct btrfs_root *root, |
4924 | struct btrfs_block_group_cache *cache, | |
4925 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4926 | { |
11833d66 YZ |
4927 | spin_lock(&cache->space_info->lock); |
4928 | spin_lock(&cache->lock); | |
4929 | cache->pinned += num_bytes; | |
4930 | cache->space_info->bytes_pinned += num_bytes; | |
4931 | if (reserved) { | |
4932 | cache->reserved -= num_bytes; | |
4933 | cache->space_info->bytes_reserved -= num_bytes; | |
4934 | } | |
4935 | spin_unlock(&cache->lock); | |
4936 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4937 | |
f0486c68 YZ |
4938 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4939 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4940 | return 0; | |
4941 | } | |
68b38550 | 4942 | |
f0486c68 YZ |
4943 | /* |
4944 | * this function must be called within transaction | |
4945 | */ | |
4946 | int btrfs_pin_extent(struct btrfs_root *root, | |
4947 | u64 bytenr, u64 num_bytes, int reserved) | |
4948 | { | |
4949 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4950 | |
f0486c68 | 4951 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 4952 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
4953 | |
4954 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4955 | ||
4956 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4957 | return 0; |
4958 | } | |
4959 | ||
f0486c68 | 4960 | /* |
e688b725 CM |
4961 | * this function must be called within transaction |
4962 | */ | |
dcfac415 | 4963 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
4964 | u64 bytenr, u64 num_bytes) |
4965 | { | |
4966 | struct btrfs_block_group_cache *cache; | |
4967 | ||
4968 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
79787eaa | 4969 | BUG_ON(!cache); /* Logic error */ |
e688b725 CM |
4970 | |
4971 | /* | |
4972 | * pull in the free space cache (if any) so that our pin | |
4973 | * removes the free space from the cache. We have load_only set | |
4974 | * to one because the slow code to read in the free extents does check | |
4975 | * the pinned extents. | |
4976 | */ | |
f6373bf3 | 4977 | cache_block_group(cache, 1); |
e688b725 CM |
4978 | |
4979 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
4980 | ||
4981 | /* remove us from the free space cache (if we're there at all) */ | |
4982 | btrfs_remove_free_space(cache, bytenr, num_bytes); | |
4983 | btrfs_put_block_group(cache); | |
4984 | return 0; | |
4985 | } | |
4986 | ||
fb25e914 JB |
4987 | /** |
4988 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
4989 | * @cache: The cache we are manipulating | |
4990 | * @num_bytes: The number of bytes in question | |
4991 | * @reserve: One of the reservation enums | |
4992 | * | |
4993 | * This is called by the allocator when it reserves space, or by somebody who is | |
4994 | * freeing space that was never actually used on disk. For example if you | |
4995 | * reserve some space for a new leaf in transaction A and before transaction A | |
4996 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
4997 | * clear the reservation. | |
4998 | * | |
4999 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5000 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5001 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5002 | * allocating less disk space for the amount of data we have reserved in the | |
5003 | * case of compression. | |
5004 | * | |
5005 | * If this is a reservation and the block group has become read only we cannot | |
5006 | * make the reservation and return -EAGAIN, otherwise this function always | |
5007 | * succeeds. | |
f0486c68 | 5008 | */ |
fb25e914 JB |
5009 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5010 | u64 num_bytes, int reserve) | |
11833d66 | 5011 | { |
fb25e914 | 5012 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5013 | int ret = 0; |
79787eaa | 5014 | |
fb25e914 JB |
5015 | spin_lock(&space_info->lock); |
5016 | spin_lock(&cache->lock); | |
5017 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5018 | if (cache->ro) { |
5019 | ret = -EAGAIN; | |
5020 | } else { | |
fb25e914 JB |
5021 | cache->reserved += num_bytes; |
5022 | space_info->bytes_reserved += num_bytes; | |
5023 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5024 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5025 | "space_info", space_info->flags, |
5026 | num_bytes, 0); | |
fb25e914 JB |
5027 | space_info->bytes_may_use -= num_bytes; |
5028 | } | |
f0486c68 | 5029 | } |
fb25e914 JB |
5030 | } else { |
5031 | if (cache->ro) | |
5032 | space_info->bytes_readonly += num_bytes; | |
5033 | cache->reserved -= num_bytes; | |
5034 | space_info->bytes_reserved -= num_bytes; | |
5035 | space_info->reservation_progress++; | |
324ae4df | 5036 | } |
fb25e914 JB |
5037 | spin_unlock(&cache->lock); |
5038 | spin_unlock(&space_info->lock); | |
f0486c68 | 5039 | return ret; |
324ae4df | 5040 | } |
9078a3e1 | 5041 | |
143bede5 | 5042 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5043 | struct btrfs_root *root) |
e8569813 | 5044 | { |
e8569813 | 5045 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5046 | struct btrfs_caching_control *next; |
5047 | struct btrfs_caching_control *caching_ctl; | |
5048 | struct btrfs_block_group_cache *cache; | |
e8569813 | 5049 | |
11833d66 | 5050 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5051 | |
11833d66 YZ |
5052 | list_for_each_entry_safe(caching_ctl, next, |
5053 | &fs_info->caching_block_groups, list) { | |
5054 | cache = caching_ctl->block_group; | |
5055 | if (block_group_cache_done(cache)) { | |
5056 | cache->last_byte_to_unpin = (u64)-1; | |
5057 | list_del_init(&caching_ctl->list); | |
5058 | put_caching_control(caching_ctl); | |
e8569813 | 5059 | } else { |
11833d66 | 5060 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5061 | } |
e8569813 | 5062 | } |
11833d66 YZ |
5063 | |
5064 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5065 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5066 | else | |
5067 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5068 | ||
5069 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
5070 | |
5071 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
5072 | } |
5073 | ||
11833d66 | 5074 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5075 | { |
11833d66 YZ |
5076 | struct btrfs_fs_info *fs_info = root->fs_info; |
5077 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5078 | struct btrfs_space_info *space_info; |
5079 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5080 | u64 len; |
7b398f8e | 5081 | bool readonly; |
ccd467d6 | 5082 | |
11833d66 | 5083 | while (start <= end) { |
7b398f8e | 5084 | readonly = false; |
11833d66 YZ |
5085 | if (!cache || |
5086 | start >= cache->key.objectid + cache->key.offset) { | |
5087 | if (cache) | |
5088 | btrfs_put_block_group(cache); | |
5089 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5090 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5091 | } |
5092 | ||
5093 | len = cache->key.objectid + cache->key.offset - start; | |
5094 | len = min(len, end + 1 - start); | |
5095 | ||
5096 | if (start < cache->last_byte_to_unpin) { | |
5097 | len = min(len, cache->last_byte_to_unpin - start); | |
5098 | btrfs_add_free_space(cache, start, len); | |
5099 | } | |
5100 | ||
f0486c68 | 5101 | start += len; |
7b398f8e | 5102 | space_info = cache->space_info; |
f0486c68 | 5103 | |
7b398f8e | 5104 | spin_lock(&space_info->lock); |
11833d66 YZ |
5105 | spin_lock(&cache->lock); |
5106 | cache->pinned -= len; | |
7b398f8e JB |
5107 | space_info->bytes_pinned -= len; |
5108 | if (cache->ro) { | |
5109 | space_info->bytes_readonly += len; | |
5110 | readonly = true; | |
5111 | } | |
11833d66 | 5112 | spin_unlock(&cache->lock); |
7b398f8e JB |
5113 | if (!readonly && global_rsv->space_info == space_info) { |
5114 | spin_lock(&global_rsv->lock); | |
5115 | if (!global_rsv->full) { | |
5116 | len = min(len, global_rsv->size - | |
5117 | global_rsv->reserved); | |
5118 | global_rsv->reserved += len; | |
5119 | space_info->bytes_may_use += len; | |
5120 | if (global_rsv->reserved >= global_rsv->size) | |
5121 | global_rsv->full = 1; | |
5122 | } | |
5123 | spin_unlock(&global_rsv->lock); | |
5124 | } | |
5125 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5126 | } |
11833d66 YZ |
5127 | |
5128 | if (cache) | |
5129 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5130 | return 0; |
5131 | } | |
5132 | ||
5133 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5134 | struct btrfs_root *root) |
a28ec197 | 5135 | { |
11833d66 YZ |
5136 | struct btrfs_fs_info *fs_info = root->fs_info; |
5137 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5138 | u64 start; |
5139 | u64 end; | |
a28ec197 | 5140 | int ret; |
a28ec197 | 5141 | |
79787eaa JM |
5142 | if (trans->aborted) |
5143 | return 0; | |
5144 | ||
11833d66 YZ |
5145 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5146 | unpin = &fs_info->freed_extents[1]; | |
5147 | else | |
5148 | unpin = &fs_info->freed_extents[0]; | |
5149 | ||
d397712b | 5150 | while (1) { |
1a5bc167 | 5151 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5152 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5153 | if (ret) |
a28ec197 | 5154 | break; |
1f3c79a2 | 5155 | |
5378e607 LD |
5156 | if (btrfs_test_opt(root, DISCARD)) |
5157 | ret = btrfs_discard_extent(root, start, | |
5158 | end + 1 - start, NULL); | |
1f3c79a2 | 5159 | |
1a5bc167 | 5160 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5161 | unpin_extent_range(root, start, end); |
b9473439 | 5162 | cond_resched(); |
a28ec197 | 5163 | } |
817d52f8 | 5164 | |
e20d96d6 CM |
5165 | return 0; |
5166 | } | |
5167 | ||
5d4f98a2 YZ |
5168 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5169 | struct btrfs_root *root, | |
5170 | u64 bytenr, u64 num_bytes, u64 parent, | |
5171 | u64 root_objectid, u64 owner_objectid, | |
5172 | u64 owner_offset, int refs_to_drop, | |
5173 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5174 | { |
e2fa7227 | 5175 | struct btrfs_key key; |
5d4f98a2 | 5176 | struct btrfs_path *path; |
1261ec42 CM |
5177 | struct btrfs_fs_info *info = root->fs_info; |
5178 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5179 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5180 | struct btrfs_extent_item *ei; |
5181 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5182 | int ret; |
5d4f98a2 | 5183 | int is_data; |
952fccac CM |
5184 | int extent_slot = 0; |
5185 | int found_extent = 0; | |
5186 | int num_to_del = 1; | |
5d4f98a2 YZ |
5187 | u32 item_size; |
5188 | u64 refs; | |
037e6390 | 5189 | |
5caf2a00 | 5190 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5191 | if (!path) |
5192 | return -ENOMEM; | |
5f26f772 | 5193 | |
3c12ac72 | 5194 | path->reada = 1; |
b9473439 | 5195 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5196 | |
5197 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5198 | BUG_ON(!is_data && refs_to_drop != 1); | |
5199 | ||
5200 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
5201 | bytenr, num_bytes, parent, | |
5202 | root_objectid, owner_objectid, | |
5203 | owner_offset); | |
7bb86316 | 5204 | if (ret == 0) { |
952fccac | 5205 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5206 | while (extent_slot >= 0) { |
5207 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5208 | extent_slot); |
5d4f98a2 | 5209 | if (key.objectid != bytenr) |
952fccac | 5210 | break; |
5d4f98a2 YZ |
5211 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5212 | key.offset == num_bytes) { | |
952fccac CM |
5213 | found_extent = 1; |
5214 | break; | |
5215 | } | |
5216 | if (path->slots[0] - extent_slot > 5) | |
5217 | break; | |
5d4f98a2 | 5218 | extent_slot--; |
952fccac | 5219 | } |
5d4f98a2 YZ |
5220 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5221 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5222 | if (found_extent && item_size < sizeof(*ei)) | |
5223 | found_extent = 0; | |
5224 | #endif | |
31840ae1 | 5225 | if (!found_extent) { |
5d4f98a2 | 5226 | BUG_ON(iref); |
56bec294 | 5227 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5228 | NULL, refs_to_drop, |
5229 | is_data); | |
005d6427 DS |
5230 | if (ret) { |
5231 | btrfs_abort_transaction(trans, extent_root, ret); | |
5232 | goto out; | |
5233 | } | |
b3b4aa74 | 5234 | btrfs_release_path(path); |
b9473439 | 5235 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5236 | |
5237 | key.objectid = bytenr; | |
5238 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5239 | key.offset = num_bytes; | |
5240 | ||
31840ae1 ZY |
5241 | ret = btrfs_search_slot(trans, extent_root, |
5242 | &key, path, -1, 1); | |
f3465ca4 JB |
5243 | if (ret) { |
5244 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
5245 | ", was looking for %llu\n", ret, |
5246 | (unsigned long long)bytenr); | |
b783e62d JB |
5247 | if (ret > 0) |
5248 | btrfs_print_leaf(extent_root, | |
5249 | path->nodes[0]); | |
f3465ca4 | 5250 | } |
005d6427 DS |
5251 | if (ret < 0) { |
5252 | btrfs_abort_transaction(trans, extent_root, ret); | |
5253 | goto out; | |
5254 | } | |
31840ae1 ZY |
5255 | extent_slot = path->slots[0]; |
5256 | } | |
79787eaa | 5257 | } else if (ret == -ENOENT) { |
7bb86316 CM |
5258 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5259 | WARN_ON(1); | |
d397712b | 5260 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 5261 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 5262 | (unsigned long long)bytenr, |
56bec294 | 5263 | (unsigned long long)parent, |
d397712b | 5264 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
5265 | (unsigned long long)owner_objectid, |
5266 | (unsigned long long)owner_offset); | |
79787eaa | 5267 | } else { |
005d6427 DS |
5268 | btrfs_abort_transaction(trans, extent_root, ret); |
5269 | goto out; | |
7bb86316 | 5270 | } |
5f39d397 CM |
5271 | |
5272 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5273 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5274 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5275 | if (item_size < sizeof(*ei)) { | |
5276 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5277 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5278 | owner_objectid, 0); | |
005d6427 DS |
5279 | if (ret < 0) { |
5280 | btrfs_abort_transaction(trans, extent_root, ret); | |
5281 | goto out; | |
5282 | } | |
5d4f98a2 | 5283 | |
b3b4aa74 | 5284 | btrfs_release_path(path); |
5d4f98a2 YZ |
5285 | path->leave_spinning = 1; |
5286 | ||
5287 | key.objectid = bytenr; | |
5288 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5289 | key.offset = num_bytes; | |
5290 | ||
5291 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5292 | -1, 1); | |
5293 | if (ret) { | |
5294 | printk(KERN_ERR "umm, got %d back from search" | |
5295 | ", was looking for %llu\n", ret, | |
5296 | (unsigned long long)bytenr); | |
5297 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
5298 | } | |
005d6427 DS |
5299 | if (ret < 0) { |
5300 | btrfs_abort_transaction(trans, extent_root, ret); | |
5301 | goto out; | |
5302 | } | |
5303 | ||
5d4f98a2 YZ |
5304 | extent_slot = path->slots[0]; |
5305 | leaf = path->nodes[0]; | |
5306 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5307 | } | |
5308 | #endif | |
5309 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5310 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5311 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5312 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
5313 | struct btrfs_tree_block_info *bi; | |
5314 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5315 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5316 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5317 | } | |
56bec294 | 5318 | |
5d4f98a2 | 5319 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
5320 | BUG_ON(refs < refs_to_drop); |
5321 | refs -= refs_to_drop; | |
5f39d397 | 5322 | |
5d4f98a2 YZ |
5323 | if (refs > 0) { |
5324 | if (extent_op) | |
5325 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5326 | /* | |
5327 | * In the case of inline back ref, reference count will | |
5328 | * be updated by remove_extent_backref | |
952fccac | 5329 | */ |
5d4f98a2 YZ |
5330 | if (iref) { |
5331 | BUG_ON(!found_extent); | |
5332 | } else { | |
5333 | btrfs_set_extent_refs(leaf, ei, refs); | |
5334 | btrfs_mark_buffer_dirty(leaf); | |
5335 | } | |
5336 | if (found_extent) { | |
5337 | ret = remove_extent_backref(trans, extent_root, path, | |
5338 | iref, refs_to_drop, | |
5339 | is_data); | |
005d6427 DS |
5340 | if (ret) { |
5341 | btrfs_abort_transaction(trans, extent_root, ret); | |
5342 | goto out; | |
5343 | } | |
952fccac | 5344 | } |
5d4f98a2 | 5345 | } else { |
5d4f98a2 YZ |
5346 | if (found_extent) { |
5347 | BUG_ON(is_data && refs_to_drop != | |
5348 | extent_data_ref_count(root, path, iref)); | |
5349 | if (iref) { | |
5350 | BUG_ON(path->slots[0] != extent_slot); | |
5351 | } else { | |
5352 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5353 | path->slots[0] = extent_slot; | |
5354 | num_to_del = 2; | |
5355 | } | |
78fae27e | 5356 | } |
b9473439 | 5357 | |
952fccac CM |
5358 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5359 | num_to_del); | |
005d6427 DS |
5360 | if (ret) { |
5361 | btrfs_abort_transaction(trans, extent_root, ret); | |
5362 | goto out; | |
5363 | } | |
b3b4aa74 | 5364 | btrfs_release_path(path); |
21af804c | 5365 | |
5d4f98a2 | 5366 | if (is_data) { |
459931ec | 5367 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5368 | if (ret) { |
5369 | btrfs_abort_transaction(trans, extent_root, ret); | |
5370 | goto out; | |
5371 | } | |
459931ec CM |
5372 | } |
5373 | ||
c53d613e | 5374 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5375 | if (ret) { |
5376 | btrfs_abort_transaction(trans, extent_root, ret); | |
5377 | goto out; | |
5378 | } | |
a28ec197 | 5379 | } |
79787eaa | 5380 | out: |
5caf2a00 | 5381 | btrfs_free_path(path); |
a28ec197 CM |
5382 | return ret; |
5383 | } | |
5384 | ||
1887be66 | 5385 | /* |
f0486c68 | 5386 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5387 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5388 | * a given extent, and if there are no other delayed refs to be processed, it | |
5389 | * removes it from the tree. | |
5390 | */ | |
5391 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5392 | struct btrfs_root *root, u64 bytenr) | |
5393 | { | |
5394 | struct btrfs_delayed_ref_head *head; | |
5395 | struct btrfs_delayed_ref_root *delayed_refs; | |
5396 | struct btrfs_delayed_ref_node *ref; | |
5397 | struct rb_node *node; | |
f0486c68 | 5398 | int ret = 0; |
1887be66 CM |
5399 | |
5400 | delayed_refs = &trans->transaction->delayed_refs; | |
5401 | spin_lock(&delayed_refs->lock); | |
5402 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5403 | if (!head) | |
5404 | goto out; | |
5405 | ||
5406 | node = rb_prev(&head->node.rb_node); | |
5407 | if (!node) | |
5408 | goto out; | |
5409 | ||
5410 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
5411 | ||
5412 | /* there are still entries for this ref, we can't drop it */ | |
5413 | if (ref->bytenr == bytenr) | |
5414 | goto out; | |
5415 | ||
5d4f98a2 YZ |
5416 | if (head->extent_op) { |
5417 | if (!head->must_insert_reserved) | |
5418 | goto out; | |
78a6184a | 5419 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5420 | head->extent_op = NULL; |
5421 | } | |
5422 | ||
1887be66 CM |
5423 | /* |
5424 | * waiting for the lock here would deadlock. If someone else has it | |
5425 | * locked they are already in the process of dropping it anyway | |
5426 | */ | |
5427 | if (!mutex_trylock(&head->mutex)) | |
5428 | goto out; | |
5429 | ||
5430 | /* | |
5431 | * at this point we have a head with no other entries. Go | |
5432 | * ahead and process it. | |
5433 | */ | |
5434 | head->node.in_tree = 0; | |
5435 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 5436 | |
1887be66 CM |
5437 | delayed_refs->num_entries--; |
5438 | ||
5439 | /* | |
5440 | * we don't take a ref on the node because we're removing it from the | |
5441 | * tree, so we just steal the ref the tree was holding. | |
5442 | */ | |
c3e69d58 CM |
5443 | delayed_refs->num_heads--; |
5444 | if (list_empty(&head->cluster)) | |
5445 | delayed_refs->num_heads_ready--; | |
5446 | ||
5447 | list_del_init(&head->cluster); | |
1887be66 CM |
5448 | spin_unlock(&delayed_refs->lock); |
5449 | ||
f0486c68 YZ |
5450 | BUG_ON(head->extent_op); |
5451 | if (head->must_insert_reserved) | |
5452 | ret = 1; | |
5453 | ||
5454 | mutex_unlock(&head->mutex); | |
1887be66 | 5455 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5456 | return ret; |
1887be66 CM |
5457 | out: |
5458 | spin_unlock(&delayed_refs->lock); | |
5459 | return 0; | |
5460 | } | |
5461 | ||
f0486c68 YZ |
5462 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5463 | struct btrfs_root *root, | |
5464 | struct extent_buffer *buf, | |
5581a51a | 5465 | u64 parent, int last_ref) |
f0486c68 | 5466 | { |
f0486c68 YZ |
5467 | struct btrfs_block_group_cache *cache = NULL; |
5468 | int ret; | |
5469 | ||
5470 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5471 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5472 | buf->start, buf->len, | |
5473 | parent, root->root_key.objectid, | |
5474 | btrfs_header_level(buf), | |
5581a51a | 5475 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5476 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5477 | } |
5478 | ||
5479 | if (!last_ref) | |
5480 | return; | |
5481 | ||
f0486c68 | 5482 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5483 | |
5484 | if (btrfs_header_generation(buf) == trans->transid) { | |
5485 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5486 | ret = check_ref_cleanup(trans, root, buf->start); | |
5487 | if (!ret) | |
37be25bc | 5488 | goto out; |
f0486c68 YZ |
5489 | } |
5490 | ||
5491 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5492 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5493 | goto out; |
f0486c68 YZ |
5494 | } |
5495 | ||
5496 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5497 | ||
5498 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5499 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
f0486c68 YZ |
5500 | } |
5501 | out: | |
a826d6dc JB |
5502 | /* |
5503 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5504 | * anymore. | |
5505 | */ | |
5506 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
5507 | btrfs_put_block_group(cache); |
5508 | } | |
5509 | ||
79787eaa | 5510 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
5511 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5512 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
5513 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
5514 | { |
5515 | int ret; | |
66d7e7f0 | 5516 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 5517 | |
56bec294 CM |
5518 | /* |
5519 | * tree log blocks never actually go into the extent allocation | |
5520 | * tree, just update pinning info and exit early. | |
56bec294 | 5521 | */ |
5d4f98a2 YZ |
5522 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
5523 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 5524 | /* unlocks the pinned mutex */ |
11833d66 | 5525 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 5526 | ret = 0; |
5d4f98a2 | 5527 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
5528 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
5529 | num_bytes, | |
5d4f98a2 | 5530 | parent, root_objectid, (int)owner, |
66d7e7f0 | 5531 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 5532 | } else { |
66d7e7f0 AJ |
5533 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
5534 | num_bytes, | |
5535 | parent, root_objectid, owner, | |
5536 | offset, BTRFS_DROP_DELAYED_REF, | |
5537 | NULL, for_cow); | |
56bec294 | 5538 | } |
925baedd CM |
5539 | return ret; |
5540 | } | |
5541 | ||
87ee04eb CM |
5542 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
5543 | { | |
5544 | u64 mask = ((u64)root->stripesize - 1); | |
5545 | u64 ret = (val + mask) & ~mask; | |
5546 | return ret; | |
5547 | } | |
5548 | ||
817d52f8 JB |
5549 | /* |
5550 | * when we wait for progress in the block group caching, its because | |
5551 | * our allocation attempt failed at least once. So, we must sleep | |
5552 | * and let some progress happen before we try again. | |
5553 | * | |
5554 | * This function will sleep at least once waiting for new free space to | |
5555 | * show up, and then it will check the block group free space numbers | |
5556 | * for our min num_bytes. Another option is to have it go ahead | |
5557 | * and look in the rbtree for a free extent of a given size, but this | |
5558 | * is a good start. | |
5559 | */ | |
5560 | static noinline int | |
5561 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
5562 | u64 num_bytes) | |
5563 | { | |
11833d66 | 5564 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 5565 | |
11833d66 YZ |
5566 | caching_ctl = get_caching_control(cache); |
5567 | if (!caching_ctl) | |
817d52f8 | 5568 | return 0; |
817d52f8 | 5569 | |
11833d66 | 5570 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 5571 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
5572 | |
5573 | put_caching_control(caching_ctl); | |
5574 | return 0; | |
5575 | } | |
5576 | ||
5577 | static noinline int | |
5578 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
5579 | { | |
5580 | struct btrfs_caching_control *caching_ctl; | |
11833d66 YZ |
5581 | |
5582 | caching_ctl = get_caching_control(cache); | |
5583 | if (!caching_ctl) | |
5584 | return 0; | |
5585 | ||
5586 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
5587 | ||
5588 | put_caching_control(caching_ctl); | |
817d52f8 JB |
5589 | return 0; |
5590 | } | |
5591 | ||
31e50229 | 5592 | int __get_raid_index(u64 flags) |
b742bb82 | 5593 | { |
7738a53a | 5594 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 5595 | return BTRFS_RAID_RAID10; |
7738a53a | 5596 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 5597 | return BTRFS_RAID_RAID1; |
7738a53a | 5598 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 5599 | return BTRFS_RAID_DUP; |
7738a53a | 5600 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 5601 | return BTRFS_RAID_RAID0; |
b742bb82 | 5602 | else |
e6ec716f | 5603 | return BTRFS_RAID_SINGLE; |
b742bb82 YZ |
5604 | } |
5605 | ||
7738a53a ID |
5606 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
5607 | { | |
31e50229 | 5608 | return __get_raid_index(cache->flags); |
7738a53a ID |
5609 | } |
5610 | ||
817d52f8 | 5611 | enum btrfs_loop_type { |
285ff5af JB |
5612 | LOOP_CACHING_NOWAIT = 0, |
5613 | LOOP_CACHING_WAIT = 1, | |
5614 | LOOP_ALLOC_CHUNK = 2, | |
5615 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
5616 | }; |
5617 | ||
fec577fb CM |
5618 | /* |
5619 | * walks the btree of allocated extents and find a hole of a given size. | |
5620 | * The key ins is changed to record the hole: | |
5621 | * ins->objectid == block start | |
62e2749e | 5622 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
5623 | * ins->offset == number of blocks |
5624 | * Any available blocks before search_start are skipped. | |
5625 | */ | |
d397712b | 5626 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
5627 | struct btrfs_root *orig_root, |
5628 | u64 num_bytes, u64 empty_size, | |
98ed5174 | 5629 | u64 hint_byte, struct btrfs_key *ins, |
e0f54067 | 5630 | u64 data) |
fec577fb | 5631 | { |
80eb234a | 5632 | int ret = 0; |
d397712b | 5633 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 5634 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 5635 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 5636 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 5637 | u64 search_start = 0; |
239b14b3 | 5638 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 5639 | struct btrfs_space_info *space_info; |
fa9c0d79 | 5640 | int loop = 0; |
ac5c9300 | 5641 | int index = __get_raid_index(data); |
fb25e914 JB |
5642 | int alloc_type = (data & BTRFS_BLOCK_GROUP_DATA) ? |
5643 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
817d52f8 | 5644 | bool found_uncached_bg = false; |
0a24325e | 5645 | bool failed_cluster_refill = false; |
1cdda9b8 | 5646 | bool failed_alloc = false; |
67377734 | 5647 | bool use_cluster = true; |
60d2adbb | 5648 | bool have_caching_bg = false; |
fec577fb | 5649 | |
db94535d | 5650 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 5651 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
5652 | ins->objectid = 0; |
5653 | ins->offset = 0; | |
b1a4d965 | 5654 | |
3f7de037 JB |
5655 | trace_find_free_extent(orig_root, num_bytes, empty_size, data); |
5656 | ||
2552d17e | 5657 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 | 5658 | if (!space_info) { |
e0f54067 | 5659 | printk(KERN_ERR "No space info for %llu\n", data); |
1b1d1f66 JB |
5660 | return -ENOSPC; |
5661 | } | |
2552d17e | 5662 | |
67377734 JB |
5663 | /* |
5664 | * If the space info is for both data and metadata it means we have a | |
5665 | * small filesystem and we can't use the clustering stuff. | |
5666 | */ | |
5667 | if (btrfs_mixed_space_info(space_info)) | |
5668 | use_cluster = false; | |
5669 | ||
67377734 | 5670 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 5671 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
5672 | if (!btrfs_test_opt(root, SSD)) |
5673 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
5674 | } |
5675 | ||
67377734 JB |
5676 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
5677 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
5678 | last_ptr = &root->fs_info->data_alloc_cluster; |
5679 | } | |
0f9dd46c | 5680 | |
239b14b3 | 5681 | if (last_ptr) { |
fa9c0d79 CM |
5682 | spin_lock(&last_ptr->lock); |
5683 | if (last_ptr->block_group) | |
5684 | hint_byte = last_ptr->window_start; | |
5685 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 5686 | } |
fa9c0d79 | 5687 | |
a061fc8d | 5688 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 5689 | search_start = max(search_start, hint_byte); |
0b86a832 | 5690 | |
817d52f8 | 5691 | if (!last_ptr) |
fa9c0d79 | 5692 | empty_cluster = 0; |
fa9c0d79 | 5693 | |
2552d17e | 5694 | if (search_start == hint_byte) { |
2552d17e JB |
5695 | block_group = btrfs_lookup_block_group(root->fs_info, |
5696 | search_start); | |
274bd4fb | 5697 | used_block_group = block_group; |
817d52f8 JB |
5698 | /* |
5699 | * we don't want to use the block group if it doesn't match our | |
5700 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
5701 | * |
5702 | * However if we are re-searching with an ideal block group | |
5703 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
5704 | */ |
5705 | if (block_group && block_group_bits(block_group, data) && | |
285ff5af | 5706 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 5707 | down_read(&space_info->groups_sem); |
44fb5511 CM |
5708 | if (list_empty(&block_group->list) || |
5709 | block_group->ro) { | |
5710 | /* | |
5711 | * someone is removing this block group, | |
5712 | * we can't jump into the have_block_group | |
5713 | * target because our list pointers are not | |
5714 | * valid | |
5715 | */ | |
5716 | btrfs_put_block_group(block_group); | |
5717 | up_read(&space_info->groups_sem); | |
ccf0e725 | 5718 | } else { |
b742bb82 | 5719 | index = get_block_group_index(block_group); |
44fb5511 | 5720 | goto have_block_group; |
ccf0e725 | 5721 | } |
2552d17e | 5722 | } else if (block_group) { |
fa9c0d79 | 5723 | btrfs_put_block_group(block_group); |
2552d17e | 5724 | } |
42e70e7a | 5725 | } |
2552d17e | 5726 | search: |
60d2adbb | 5727 | have_caching_bg = false; |
80eb234a | 5728 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
5729 | list_for_each_entry(block_group, &space_info->block_groups[index], |
5730 | list) { | |
6226cb0a | 5731 | u64 offset; |
817d52f8 | 5732 | int cached; |
8a1413a2 | 5733 | |
274bd4fb | 5734 | used_block_group = block_group; |
11dfe35a | 5735 | btrfs_get_block_group(block_group); |
2552d17e | 5736 | search_start = block_group->key.objectid; |
42e70e7a | 5737 | |
83a50de9 CM |
5738 | /* |
5739 | * this can happen if we end up cycling through all the | |
5740 | * raid types, but we want to make sure we only allocate | |
5741 | * for the proper type. | |
5742 | */ | |
5743 | if (!block_group_bits(block_group, data)) { | |
5744 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
5745 | BTRFS_BLOCK_GROUP_RAID1 | | |
5746 | BTRFS_BLOCK_GROUP_RAID10; | |
5747 | ||
5748 | /* | |
5749 | * if they asked for extra copies and this block group | |
5750 | * doesn't provide them, bail. This does allow us to | |
5751 | * fill raid0 from raid1. | |
5752 | */ | |
5753 | if ((data & extra) && !(block_group->flags & extra)) | |
5754 | goto loop; | |
5755 | } | |
5756 | ||
2552d17e | 5757 | have_block_group: |
291c7d2f JB |
5758 | cached = block_group_cache_done(block_group); |
5759 | if (unlikely(!cached)) { | |
291c7d2f | 5760 | found_uncached_bg = true; |
f6373bf3 | 5761 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
5762 | BUG_ON(ret < 0); |
5763 | ret = 0; | |
817d52f8 JB |
5764 | } |
5765 | ||
ea6a478e | 5766 | if (unlikely(block_group->ro)) |
2552d17e | 5767 | goto loop; |
0f9dd46c | 5768 | |
0a24325e | 5769 | /* |
062c05c4 AO |
5770 | * Ok we want to try and use the cluster allocator, so |
5771 | * lets look there | |
0a24325e | 5772 | */ |
062c05c4 | 5773 | if (last_ptr) { |
fa9c0d79 CM |
5774 | /* |
5775 | * the refill lock keeps out other | |
5776 | * people trying to start a new cluster | |
5777 | */ | |
5778 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
5779 | used_block_group = last_ptr->block_group; |
5780 | if (used_block_group != block_group && | |
5781 | (!used_block_group || | |
5782 | used_block_group->ro || | |
5783 | !block_group_bits(used_block_group, data))) { | |
5784 | used_block_group = block_group; | |
44fb5511 | 5785 | goto refill_cluster; |
274bd4fb AO |
5786 | } |
5787 | ||
5788 | if (used_block_group != block_group) | |
5789 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 5790 | |
274bd4fb AO |
5791 | offset = btrfs_alloc_from_cluster(used_block_group, |
5792 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
5793 | if (offset) { |
5794 | /* we have a block, we're done */ | |
5795 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
5796 | trace_btrfs_reserve_extent_cluster(root, |
5797 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
5798 | goto checks; |
5799 | } | |
5800 | ||
274bd4fb AO |
5801 | WARN_ON(last_ptr->block_group != used_block_group); |
5802 | if (used_block_group != block_group) { | |
5803 | btrfs_put_block_group(used_block_group); | |
5804 | used_block_group = block_group; | |
fa9c0d79 | 5805 | } |
44fb5511 | 5806 | refill_cluster: |
274bd4fb | 5807 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
5808 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
5809 | * set up a new clusters, so lets just skip it | |
5810 | * and let the allocator find whatever block | |
5811 | * it can find. If we reach this point, we | |
5812 | * will have tried the cluster allocator | |
5813 | * plenty of times and not have found | |
5814 | * anything, so we are likely way too | |
5815 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
5816 | * anything. |
5817 | * | |
5818 | * However, if the cluster is taken from the | |
5819 | * current block group, release the cluster | |
5820 | * first, so that we stand a better chance of | |
5821 | * succeeding in the unclustered | |
5822 | * allocation. */ | |
5823 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
5824 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
5825 | spin_unlock(&last_ptr->refill_lock); |
5826 | goto unclustered_alloc; | |
5827 | } | |
5828 | ||
fa9c0d79 CM |
5829 | /* |
5830 | * this cluster didn't work out, free it and | |
5831 | * start over | |
5832 | */ | |
5833 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5834 | ||
a5f6f719 AO |
5835 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
5836 | spin_unlock(&last_ptr->refill_lock); | |
5837 | goto unclustered_alloc; | |
5838 | } | |
5839 | ||
fa9c0d79 | 5840 | /* allocate a cluster in this block group */ |
451d7585 | 5841 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 5842 | block_group, last_ptr, |
1b22bad7 | 5843 | search_start, num_bytes, |
fa9c0d79 CM |
5844 | empty_cluster + empty_size); |
5845 | if (ret == 0) { | |
5846 | /* | |
5847 | * now pull our allocation out of this | |
5848 | * cluster | |
5849 | */ | |
5850 | offset = btrfs_alloc_from_cluster(block_group, | |
5851 | last_ptr, num_bytes, | |
5852 | search_start); | |
5853 | if (offset) { | |
5854 | /* we found one, proceed */ | |
5855 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
5856 | trace_btrfs_reserve_extent_cluster(root, |
5857 | block_group, search_start, | |
5858 | num_bytes); | |
fa9c0d79 CM |
5859 | goto checks; |
5860 | } | |
0a24325e JB |
5861 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5862 | && !failed_cluster_refill) { | |
817d52f8 JB |
5863 | spin_unlock(&last_ptr->refill_lock); |
5864 | ||
0a24325e | 5865 | failed_cluster_refill = true; |
817d52f8 JB |
5866 | wait_block_group_cache_progress(block_group, |
5867 | num_bytes + empty_cluster + empty_size); | |
5868 | goto have_block_group; | |
fa9c0d79 | 5869 | } |
817d52f8 | 5870 | |
fa9c0d79 CM |
5871 | /* |
5872 | * at this point we either didn't find a cluster | |
5873 | * or we weren't able to allocate a block from our | |
5874 | * cluster. Free the cluster we've been trying | |
5875 | * to use, and go to the next block group | |
5876 | */ | |
0a24325e | 5877 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5878 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5879 | goto loop; |
fa9c0d79 CM |
5880 | } |
5881 | ||
062c05c4 | 5882 | unclustered_alloc: |
a5f6f719 AO |
5883 | spin_lock(&block_group->free_space_ctl->tree_lock); |
5884 | if (cached && | |
5885 | block_group->free_space_ctl->free_space < | |
5886 | num_bytes + empty_cluster + empty_size) { | |
5887 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
5888 | goto loop; | |
5889 | } | |
5890 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
5891 | ||
6226cb0a JB |
5892 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5893 | num_bytes, empty_size); | |
1cdda9b8 JB |
5894 | /* |
5895 | * If we didn't find a chunk, and we haven't failed on this | |
5896 | * block group before, and this block group is in the middle of | |
5897 | * caching and we are ok with waiting, then go ahead and wait | |
5898 | * for progress to be made, and set failed_alloc to true. | |
5899 | * | |
5900 | * If failed_alloc is true then we've already waited on this | |
5901 | * block group once and should move on to the next block group. | |
5902 | */ | |
5903 | if (!offset && !failed_alloc && !cached && | |
5904 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5905 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5906 | num_bytes + empty_size); |
5907 | failed_alloc = true; | |
817d52f8 | 5908 | goto have_block_group; |
1cdda9b8 | 5909 | } else if (!offset) { |
60d2adbb MX |
5910 | if (!cached) |
5911 | have_caching_bg = true; | |
1cdda9b8 | 5912 | goto loop; |
817d52f8 | 5913 | } |
fa9c0d79 | 5914 | checks: |
6226cb0a | 5915 | search_start = stripe_align(root, offset); |
25179201 | 5916 | |
2552d17e JB |
5917 | /* move on to the next group */ |
5918 | if (search_start + num_bytes > | |
274bd4fb AO |
5919 | used_block_group->key.objectid + used_block_group->key.offset) { |
5920 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 5921 | goto loop; |
6226cb0a | 5922 | } |
f5a31e16 | 5923 | |
f0486c68 | 5924 | if (offset < search_start) |
274bd4fb | 5925 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
5926 | search_start - offset); |
5927 | BUG_ON(offset > search_start); | |
2552d17e | 5928 | |
274bd4fb | 5929 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 5930 | alloc_type); |
f0486c68 | 5931 | if (ret == -EAGAIN) { |
274bd4fb | 5932 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 5933 | goto loop; |
0f9dd46c | 5934 | } |
0b86a832 | 5935 | |
f0486c68 | 5936 | /* we are all good, lets return */ |
2552d17e JB |
5937 | ins->objectid = search_start; |
5938 | ins->offset = num_bytes; | |
d2fb3437 | 5939 | |
3f7de037 JB |
5940 | trace_btrfs_reserve_extent(orig_root, block_group, |
5941 | search_start, num_bytes); | |
274bd4fb AO |
5942 | if (used_block_group != block_group) |
5943 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 5944 | btrfs_put_block_group(block_group); |
2552d17e JB |
5945 | break; |
5946 | loop: | |
0a24325e | 5947 | failed_cluster_refill = false; |
1cdda9b8 | 5948 | failed_alloc = false; |
b742bb82 | 5949 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
5950 | if (used_block_group != block_group) |
5951 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 5952 | btrfs_put_block_group(block_group); |
2552d17e JB |
5953 | } |
5954 | up_read(&space_info->groups_sem); | |
5955 | ||
60d2adbb MX |
5956 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
5957 | goto search; | |
5958 | ||
b742bb82 YZ |
5959 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5960 | goto search; | |
5961 | ||
285ff5af | 5962 | /* |
ccf0e725 JB |
5963 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
5964 | * caching kthreads as we move along | |
817d52f8 JB |
5965 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5966 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5967 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5968 | * again | |
fa9c0d79 | 5969 | */ |
723bda20 | 5970 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 5971 | index = 0; |
723bda20 | 5972 | loop++; |
817d52f8 | 5973 | if (loop == LOOP_ALLOC_CHUNK) { |
698d0082 | 5974 | ret = do_chunk_alloc(trans, root, data, |
ea658bad JB |
5975 | CHUNK_ALLOC_FORCE); |
5976 | /* | |
5977 | * Do not bail out on ENOSPC since we | |
5978 | * can do more things. | |
5979 | */ | |
5980 | if (ret < 0 && ret != -ENOSPC) { | |
5981 | btrfs_abort_transaction(trans, | |
5982 | root, ret); | |
5983 | goto out; | |
723bda20 | 5984 | } |
2552d17e JB |
5985 | } |
5986 | ||
723bda20 JB |
5987 | if (loop == LOOP_NO_EMPTY_SIZE) { |
5988 | empty_size = 0; | |
5989 | empty_cluster = 0; | |
fa9c0d79 | 5990 | } |
723bda20 JB |
5991 | |
5992 | goto search; | |
2552d17e JB |
5993 | } else if (!ins->objectid) { |
5994 | ret = -ENOSPC; | |
d82a6f1d | 5995 | } else if (ins->objectid) { |
80eb234a | 5996 | ret = 0; |
be744175 | 5997 | } |
79787eaa | 5998 | out: |
be744175 | 5999 | |
0f70abe2 | 6000 | return ret; |
fec577fb | 6001 | } |
ec44a35c | 6002 | |
9ed74f2d JB |
6003 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6004 | int dump_block_groups) | |
0f9dd46c JB |
6005 | { |
6006 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6007 | int index = 0; |
0f9dd46c | 6008 | |
9ed74f2d | 6009 | spin_lock(&info->lock); |
fb25e914 JB |
6010 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
6011 | (unsigned long long)info->flags, | |
d397712b | 6012 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 6013 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 6014 | info->bytes_readonly), |
d397712b | 6015 | (info->full) ? "" : "not "); |
8929ecfa YZ |
6016 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
6017 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 6018 | (unsigned long long)info->total_bytes, |
8929ecfa | 6019 | (unsigned long long)info->bytes_used, |
21380931 | 6020 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 6021 | (unsigned long long)info->bytes_reserved, |
21380931 | 6022 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 6023 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
6024 | spin_unlock(&info->lock); |
6025 | ||
6026 | if (!dump_block_groups) | |
6027 | return; | |
0f9dd46c | 6028 | |
80eb234a | 6029 | down_read(&info->groups_sem); |
b742bb82 YZ |
6030 | again: |
6031 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6032 | spin_lock(&cache->lock); |
799ffc3c | 6033 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
d397712b CM |
6034 | (unsigned long long)cache->key.objectid, |
6035 | (unsigned long long)cache->key.offset, | |
6036 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
6037 | (unsigned long long)cache->pinned, | |
799ffc3c LB |
6038 | (unsigned long long)cache->reserved, |
6039 | cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6040 | btrfs_dump_free_space(cache, bytes); |
6041 | spin_unlock(&cache->lock); | |
6042 | } | |
b742bb82 YZ |
6043 | if (++index < BTRFS_NR_RAID_TYPES) |
6044 | goto again; | |
80eb234a | 6045 | up_read(&info->groups_sem); |
0f9dd46c | 6046 | } |
e8569813 | 6047 | |
11833d66 YZ |
6048 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
6049 | struct btrfs_root *root, | |
6050 | u64 num_bytes, u64 min_alloc_size, | |
6051 | u64 empty_size, u64 hint_byte, | |
81c9ad23 | 6052 | struct btrfs_key *ins, u64 data) |
fec577fb | 6053 | { |
9e622d6b | 6054 | bool final_tried = false; |
fec577fb | 6055 | int ret; |
925baedd | 6056 | |
6a63209f | 6057 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 6058 | again: |
db94535d CM |
6059 | WARN_ON(num_bytes < root->sectorsize); |
6060 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
81c9ad23 | 6061 | hint_byte, ins, data); |
3b951516 | 6062 | |
9e622d6b MX |
6063 | if (ret == -ENOSPC) { |
6064 | if (!final_tried) { | |
6065 | num_bytes = num_bytes >> 1; | |
6066 | num_bytes = num_bytes & ~(root->sectorsize - 1); | |
6067 | num_bytes = max(num_bytes, min_alloc_size); | |
9e622d6b MX |
6068 | if (num_bytes == min_alloc_size) |
6069 | final_tried = true; | |
6070 | goto again; | |
6071 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6072 | struct btrfs_space_info *sinfo; | |
6073 | ||
6074 | sinfo = __find_space_info(root->fs_info, data); | |
6075 | printk(KERN_ERR "btrfs allocation failed flags %llu, " | |
6076 | "wanted %llu\n", (unsigned long long)data, | |
6077 | (unsigned long long)num_bytes); | |
53804280 JM |
6078 | if (sinfo) |
6079 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6080 | } |
925baedd | 6081 | } |
0f9dd46c | 6082 | |
1abe9b8a | 6083 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
6084 | ||
0f9dd46c | 6085 | return ret; |
e6dcd2dc CM |
6086 | } |
6087 | ||
e688b725 CM |
6088 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6089 | u64 start, u64 len, int pin) | |
65b51a00 | 6090 | { |
0f9dd46c | 6091 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6092 | int ret = 0; |
0f9dd46c | 6093 | |
0f9dd46c JB |
6094 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6095 | if (!cache) { | |
d397712b CM |
6096 | printk(KERN_ERR "Unable to find block group for %llu\n", |
6097 | (unsigned long long)start); | |
0f9dd46c JB |
6098 | return -ENOSPC; |
6099 | } | |
1f3c79a2 | 6100 | |
5378e607 LD |
6101 | if (btrfs_test_opt(root, DISCARD)) |
6102 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6103 | |
e688b725 CM |
6104 | if (pin) |
6105 | pin_down_extent(root, cache, start, len, 1); | |
6106 | else { | |
6107 | btrfs_add_free_space(cache, start, len); | |
6108 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6109 | } | |
fa9c0d79 | 6110 | btrfs_put_block_group(cache); |
817d52f8 | 6111 | |
1abe9b8a | 6112 | trace_btrfs_reserved_extent_free(root, start, len); |
6113 | ||
e6dcd2dc CM |
6114 | return ret; |
6115 | } | |
6116 | ||
e688b725 CM |
6117 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6118 | u64 start, u64 len) | |
6119 | { | |
6120 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6121 | } | |
6122 | ||
6123 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6124 | u64 start, u64 len) | |
6125 | { | |
6126 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6127 | } | |
6128 | ||
5d4f98a2 YZ |
6129 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6130 | struct btrfs_root *root, | |
6131 | u64 parent, u64 root_objectid, | |
6132 | u64 flags, u64 owner, u64 offset, | |
6133 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6134 | { |
6135 | int ret; | |
5d4f98a2 | 6136 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6137 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6138 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6139 | struct btrfs_path *path; |
5d4f98a2 YZ |
6140 | struct extent_buffer *leaf; |
6141 | int type; | |
6142 | u32 size; | |
26b8003f | 6143 | |
5d4f98a2 YZ |
6144 | if (parent > 0) |
6145 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6146 | else | |
6147 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6148 | |
5d4f98a2 | 6149 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6150 | |
6151 | path = btrfs_alloc_path(); | |
db5b493a TI |
6152 | if (!path) |
6153 | return -ENOMEM; | |
47e4bb98 | 6154 | |
b9473439 | 6155 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6156 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6157 | ins, size); | |
79787eaa JM |
6158 | if (ret) { |
6159 | btrfs_free_path(path); | |
6160 | return ret; | |
6161 | } | |
0f9dd46c | 6162 | |
5d4f98a2 YZ |
6163 | leaf = path->nodes[0]; |
6164 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6165 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6166 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6167 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6168 | btrfs_set_extent_flags(leaf, extent_item, | |
6169 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6170 | ||
6171 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6172 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6173 | if (parent > 0) { | |
6174 | struct btrfs_shared_data_ref *ref; | |
6175 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6176 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6177 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6178 | } else { | |
6179 | struct btrfs_extent_data_ref *ref; | |
6180 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6181 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6182 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6183 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6184 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6185 | } | |
47e4bb98 CM |
6186 | |
6187 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6188 | btrfs_free_path(path); |
f510cfec | 6189 | |
c53d613e | 6190 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6191 | if (ret) { /* -ENOENT, logic error */ |
d397712b CM |
6192 | printk(KERN_ERR "btrfs update block group failed for %llu " |
6193 | "%llu\n", (unsigned long long)ins->objectid, | |
6194 | (unsigned long long)ins->offset); | |
f5947066 CM |
6195 | BUG(); |
6196 | } | |
e6dcd2dc CM |
6197 | return ret; |
6198 | } | |
6199 | ||
5d4f98a2 YZ |
6200 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6201 | struct btrfs_root *root, | |
6202 | u64 parent, u64 root_objectid, | |
6203 | u64 flags, struct btrfs_disk_key *key, | |
6204 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6205 | { |
6206 | int ret; | |
5d4f98a2 YZ |
6207 | struct btrfs_fs_info *fs_info = root->fs_info; |
6208 | struct btrfs_extent_item *extent_item; | |
6209 | struct btrfs_tree_block_info *block_info; | |
6210 | struct btrfs_extent_inline_ref *iref; | |
6211 | struct btrfs_path *path; | |
6212 | struct extent_buffer *leaf; | |
6213 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 6214 | |
5d4f98a2 | 6215 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6216 | if (!path) |
6217 | return -ENOMEM; | |
56bec294 | 6218 | |
5d4f98a2 YZ |
6219 | path->leave_spinning = 1; |
6220 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6221 | ins, size); | |
79787eaa JM |
6222 | if (ret) { |
6223 | btrfs_free_path(path); | |
6224 | return ret; | |
6225 | } | |
5d4f98a2 YZ |
6226 | |
6227 | leaf = path->nodes[0]; | |
6228 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6229 | struct btrfs_extent_item); | |
6230 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6231 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6232 | btrfs_set_extent_flags(leaf, extent_item, | |
6233 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
6234 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6235 | ||
6236 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6237 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6238 | ||
6239 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6240 | if (parent > 0) { | |
6241 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6242 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6243 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6244 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6245 | } else { | |
6246 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6247 | BTRFS_TREE_BLOCK_REF_KEY); | |
6248 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6249 | } | |
6250 | ||
6251 | btrfs_mark_buffer_dirty(leaf); | |
6252 | btrfs_free_path(path); | |
6253 | ||
c53d613e | 6254 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6255 | if (ret) { /* -ENOENT, logic error */ |
5d4f98a2 YZ |
6256 | printk(KERN_ERR "btrfs update block group failed for %llu " |
6257 | "%llu\n", (unsigned long long)ins->objectid, | |
6258 | (unsigned long long)ins->offset); | |
6259 | BUG(); | |
6260 | } | |
6261 | return ret; | |
6262 | } | |
6263 | ||
6264 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6265 | struct btrfs_root *root, | |
6266 | u64 root_objectid, u64 owner, | |
6267 | u64 offset, struct btrfs_key *ins) | |
6268 | { | |
6269 | int ret; | |
6270 | ||
6271 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6272 | ||
66d7e7f0 AJ |
6273 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6274 | ins->offset, 0, | |
6275 | root_objectid, owner, offset, | |
6276 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6277 | return ret; |
6278 | } | |
e02119d5 CM |
6279 | |
6280 | /* | |
6281 | * this is used by the tree logging recovery code. It records that | |
6282 | * an extent has been allocated and makes sure to clear the free | |
6283 | * space cache bits as well | |
6284 | */ | |
5d4f98a2 YZ |
6285 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6286 | struct btrfs_root *root, | |
6287 | u64 root_objectid, u64 owner, u64 offset, | |
6288 | struct btrfs_key *ins) | |
e02119d5 CM |
6289 | { |
6290 | int ret; | |
6291 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
6292 | struct btrfs_caching_control *caching_ctl; |
6293 | u64 start = ins->objectid; | |
6294 | u64 num_bytes = ins->offset; | |
e02119d5 | 6295 | |
e02119d5 | 6296 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
f6373bf3 | 6297 | cache_block_group(block_group, 0); |
11833d66 | 6298 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 6299 | |
11833d66 YZ |
6300 | if (!caching_ctl) { |
6301 | BUG_ON(!block_group_cache_done(block_group)); | |
6302 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
79787eaa | 6303 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6304 | } else { |
6305 | mutex_lock(&caching_ctl->mutex); | |
6306 | ||
6307 | if (start >= caching_ctl->progress) { | |
6308 | ret = add_excluded_extent(root, start, num_bytes); | |
79787eaa | 6309 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6310 | } else if (start + num_bytes <= caching_ctl->progress) { |
6311 | ret = btrfs_remove_free_space(block_group, | |
6312 | start, num_bytes); | |
79787eaa | 6313 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6314 | } else { |
6315 | num_bytes = caching_ctl->progress - start; | |
6316 | ret = btrfs_remove_free_space(block_group, | |
6317 | start, num_bytes); | |
79787eaa | 6318 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6319 | |
6320 | start = caching_ctl->progress; | |
6321 | num_bytes = ins->objectid + ins->offset - | |
6322 | caching_ctl->progress; | |
6323 | ret = add_excluded_extent(root, start, num_bytes); | |
79787eaa | 6324 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6325 | } |
6326 | ||
6327 | mutex_unlock(&caching_ctl->mutex); | |
6328 | put_caching_control(caching_ctl); | |
6329 | } | |
6330 | ||
fb25e914 JB |
6331 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6332 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6333 | BUG_ON(ret); /* logic error */ |
fa9c0d79 | 6334 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
6335 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6336 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
6337 | return ret; |
6338 | } | |
6339 | ||
65b51a00 CM |
6340 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
6341 | struct btrfs_root *root, | |
4008c04a CM |
6342 | u64 bytenr, u32 blocksize, |
6343 | int level) | |
65b51a00 CM |
6344 | { |
6345 | struct extent_buffer *buf; | |
6346 | ||
6347 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6348 | if (!buf) | |
6349 | return ERR_PTR(-ENOMEM); | |
6350 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6351 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6352 | btrfs_tree_lock(buf); |
6353 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6354 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6355 | |
6356 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6357 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6358 | |
d0c803c4 | 6359 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6360 | /* |
6361 | * we allow two log transactions at a time, use different | |
6362 | * EXENT bit to differentiate dirty pages. | |
6363 | */ | |
6364 | if (root->log_transid % 2 == 0) | |
6365 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6366 | buf->start + buf->len - 1, GFP_NOFS); | |
6367 | else | |
6368 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6369 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6370 | } else { |
6371 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6372 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6373 | } |
65b51a00 | 6374 | trans->blocks_used++; |
b4ce94de | 6375 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6376 | return buf; |
6377 | } | |
6378 | ||
f0486c68 YZ |
6379 | static struct btrfs_block_rsv * |
6380 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6381 | struct btrfs_root *root, u32 blocksize) | |
6382 | { | |
6383 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6384 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
6385 | int ret; |
6386 | ||
6387 | block_rsv = get_block_rsv(trans, root); | |
6388 | ||
6389 | if (block_rsv->size == 0) { | |
08e007d2 MX |
6390 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6391 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 JB |
6392 | /* |
6393 | * If we couldn't reserve metadata bytes try and use some from | |
6394 | * the global reserve. | |
6395 | */ | |
6396 | if (ret && block_rsv != global_rsv) { | |
6397 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6398 | if (!ret) | |
6399 | return global_rsv; | |
f0486c68 | 6400 | return ERR_PTR(ret); |
68a82277 | 6401 | } else if (ret) { |
f0486c68 | 6402 | return ERR_PTR(ret); |
68a82277 | 6403 | } |
f0486c68 YZ |
6404 | return block_rsv; |
6405 | } | |
6406 | ||
6407 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
6408 | if (!ret) | |
6409 | return block_rsv; | |
ca7e70f5 | 6410 | if (ret && !block_rsv->failfast) { |
dff51cd1 DS |
6411 | static DEFINE_RATELIMIT_STATE(_rs, |
6412 | DEFAULT_RATELIMIT_INTERVAL, | |
6413 | /*DEFAULT_RATELIMIT_BURST*/ 2); | |
31b1a2bd JL |
6414 | if (__ratelimit(&_rs)) |
6415 | WARN(1, KERN_DEBUG "btrfs: block rsv returned %d\n", | |
6416 | ret); | |
08e007d2 MX |
6417 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6418 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 | 6419 | if (!ret) { |
68a82277 JB |
6420 | return block_rsv; |
6421 | } else if (ret && block_rsv != global_rsv) { | |
6422 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6423 | if (!ret) | |
6424 | return global_rsv; | |
6425 | } | |
6426 | } | |
f0486c68 | 6427 | |
f0486c68 YZ |
6428 | return ERR_PTR(-ENOSPC); |
6429 | } | |
6430 | ||
8c2a3ca2 JB |
6431 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6432 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6433 | { |
6434 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6435 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6436 | } |
6437 | ||
fec577fb | 6438 | /* |
f0486c68 YZ |
6439 | * finds a free extent and does all the dirty work required for allocation |
6440 | * returns the key for the extent through ins, and a tree buffer for | |
6441 | * the first block of the extent through buf. | |
6442 | * | |
fec577fb CM |
6443 | * returns the tree buffer or NULL. |
6444 | */ | |
5f39d397 | 6445 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6446 | struct btrfs_root *root, u32 blocksize, |
6447 | u64 parent, u64 root_objectid, | |
6448 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6449 | u64 hint, u64 empty_size) |
fec577fb | 6450 | { |
e2fa7227 | 6451 | struct btrfs_key ins; |
f0486c68 | 6452 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6453 | struct extent_buffer *buf; |
f0486c68 YZ |
6454 | u64 flags = 0; |
6455 | int ret; | |
6456 | ||
fec577fb | 6457 | |
f0486c68 YZ |
6458 | block_rsv = use_block_rsv(trans, root, blocksize); |
6459 | if (IS_ERR(block_rsv)) | |
6460 | return ERR_CAST(block_rsv); | |
6461 | ||
6462 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
81c9ad23 | 6463 | empty_size, hint, &ins, 0); |
fec577fb | 6464 | if (ret) { |
8c2a3ca2 | 6465 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 6466 | return ERR_PTR(ret); |
fec577fb | 6467 | } |
55c69072 | 6468 | |
4008c04a CM |
6469 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6470 | blocksize, level); | |
79787eaa | 6471 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
6472 | |
6473 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6474 | if (parent == 0) | |
6475 | parent = ins.objectid; | |
6476 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6477 | } else | |
6478 | BUG_ON(parent > 0); | |
6479 | ||
6480 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6481 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 6482 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 6483 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
6484 | if (key) |
6485 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6486 | else | |
6487 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6488 | extent_op->flags_to_set = flags; | |
6489 | extent_op->update_key = 1; | |
6490 | extent_op->update_flags = 1; | |
6491 | extent_op->is_data = 0; | |
6492 | ||
66d7e7f0 AJ |
6493 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6494 | ins.objectid, | |
f0486c68 YZ |
6495 | ins.offset, parent, root_objectid, |
6496 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 6497 | extent_op, 0); |
79787eaa | 6498 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 6499 | } |
fec577fb CM |
6500 | return buf; |
6501 | } | |
a28ec197 | 6502 | |
2c47e605 YZ |
6503 | struct walk_control { |
6504 | u64 refs[BTRFS_MAX_LEVEL]; | |
6505 | u64 flags[BTRFS_MAX_LEVEL]; | |
6506 | struct btrfs_key update_progress; | |
6507 | int stage; | |
6508 | int level; | |
6509 | int shared_level; | |
6510 | int update_ref; | |
6511 | int keep_locks; | |
1c4850e2 YZ |
6512 | int reada_slot; |
6513 | int reada_count; | |
66d7e7f0 | 6514 | int for_reloc; |
2c47e605 YZ |
6515 | }; |
6516 | ||
6517 | #define DROP_REFERENCE 1 | |
6518 | #define UPDATE_BACKREF 2 | |
6519 | ||
1c4850e2 YZ |
6520 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
6521 | struct btrfs_root *root, | |
6522 | struct walk_control *wc, | |
6523 | struct btrfs_path *path) | |
6407bf6d | 6524 | { |
1c4850e2 YZ |
6525 | u64 bytenr; |
6526 | u64 generation; | |
6527 | u64 refs; | |
94fcca9f | 6528 | u64 flags; |
5d4f98a2 | 6529 | u32 nritems; |
1c4850e2 YZ |
6530 | u32 blocksize; |
6531 | struct btrfs_key key; | |
6532 | struct extent_buffer *eb; | |
6407bf6d | 6533 | int ret; |
1c4850e2 YZ |
6534 | int slot; |
6535 | int nread = 0; | |
6407bf6d | 6536 | |
1c4850e2 YZ |
6537 | if (path->slots[wc->level] < wc->reada_slot) { |
6538 | wc->reada_count = wc->reada_count * 2 / 3; | |
6539 | wc->reada_count = max(wc->reada_count, 2); | |
6540 | } else { | |
6541 | wc->reada_count = wc->reada_count * 3 / 2; | |
6542 | wc->reada_count = min_t(int, wc->reada_count, | |
6543 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
6544 | } | |
7bb86316 | 6545 | |
1c4850e2 YZ |
6546 | eb = path->nodes[wc->level]; |
6547 | nritems = btrfs_header_nritems(eb); | |
6548 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 6549 | |
1c4850e2 YZ |
6550 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
6551 | if (nread >= wc->reada_count) | |
6552 | break; | |
bd56b302 | 6553 | |
2dd3e67b | 6554 | cond_resched(); |
1c4850e2 YZ |
6555 | bytenr = btrfs_node_blockptr(eb, slot); |
6556 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 6557 | |
1c4850e2 YZ |
6558 | if (slot == path->slots[wc->level]) |
6559 | goto reada; | |
5d4f98a2 | 6560 | |
1c4850e2 YZ |
6561 | if (wc->stage == UPDATE_BACKREF && |
6562 | generation <= root->root_key.offset) | |
bd56b302 CM |
6563 | continue; |
6564 | ||
94fcca9f YZ |
6565 | /* We don't lock the tree block, it's OK to be racy here */ |
6566 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
6567 | &refs, &flags); | |
79787eaa JM |
6568 | /* We don't care about errors in readahead. */ |
6569 | if (ret < 0) | |
6570 | continue; | |
94fcca9f YZ |
6571 | BUG_ON(refs == 0); |
6572 | ||
1c4850e2 | 6573 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
6574 | if (refs == 1) |
6575 | goto reada; | |
bd56b302 | 6576 | |
94fcca9f YZ |
6577 | if (wc->level == 1 && |
6578 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6579 | continue; | |
1c4850e2 YZ |
6580 | if (!wc->update_ref || |
6581 | generation <= root->root_key.offset) | |
6582 | continue; | |
6583 | btrfs_node_key_to_cpu(eb, &key, slot); | |
6584 | ret = btrfs_comp_cpu_keys(&key, | |
6585 | &wc->update_progress); | |
6586 | if (ret < 0) | |
6587 | continue; | |
94fcca9f YZ |
6588 | } else { |
6589 | if (wc->level == 1 && | |
6590 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6591 | continue; | |
6407bf6d | 6592 | } |
1c4850e2 YZ |
6593 | reada: |
6594 | ret = readahead_tree_block(root, bytenr, blocksize, | |
6595 | generation); | |
6596 | if (ret) | |
bd56b302 | 6597 | break; |
1c4850e2 | 6598 | nread++; |
20524f02 | 6599 | } |
1c4850e2 | 6600 | wc->reada_slot = slot; |
20524f02 | 6601 | } |
2c47e605 | 6602 | |
f82d02d9 | 6603 | /* |
2c47e605 YZ |
6604 | * hepler to process tree block while walking down the tree. |
6605 | * | |
2c47e605 YZ |
6606 | * when wc->stage == UPDATE_BACKREF, this function updates |
6607 | * back refs for pointers in the block. | |
6608 | * | |
6609 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 6610 | */ |
2c47e605 | 6611 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 6612 | struct btrfs_root *root, |
2c47e605 | 6613 | struct btrfs_path *path, |
94fcca9f | 6614 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 6615 | { |
2c47e605 YZ |
6616 | int level = wc->level; |
6617 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 6618 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
6619 | int ret; |
6620 | ||
2c47e605 YZ |
6621 | if (wc->stage == UPDATE_BACKREF && |
6622 | btrfs_header_owner(eb) != root->root_key.objectid) | |
6623 | return 1; | |
f82d02d9 | 6624 | |
2c47e605 YZ |
6625 | /* |
6626 | * when reference count of tree block is 1, it won't increase | |
6627 | * again. once full backref flag is set, we never clear it. | |
6628 | */ | |
94fcca9f YZ |
6629 | if (lookup_info && |
6630 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
6631 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
6632 | BUG_ON(!path->locks[level]); |
6633 | ret = btrfs_lookup_extent_info(trans, root, | |
6634 | eb->start, eb->len, | |
6635 | &wc->refs[level], | |
6636 | &wc->flags[level]); | |
79787eaa JM |
6637 | BUG_ON(ret == -ENOMEM); |
6638 | if (ret) | |
6639 | return ret; | |
2c47e605 YZ |
6640 | BUG_ON(wc->refs[level] == 0); |
6641 | } | |
5d4f98a2 | 6642 | |
2c47e605 YZ |
6643 | if (wc->stage == DROP_REFERENCE) { |
6644 | if (wc->refs[level] > 1) | |
6645 | return 1; | |
f82d02d9 | 6646 | |
2c47e605 | 6647 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 6648 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6649 | path->locks[level] = 0; |
6650 | } | |
6651 | return 0; | |
6652 | } | |
f82d02d9 | 6653 | |
2c47e605 YZ |
6654 | /* wc->stage == UPDATE_BACKREF */ |
6655 | if (!(wc->flags[level] & flag)) { | |
6656 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 6657 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 6658 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 6659 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 6660 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6661 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
6662 | eb->len, flag, 0); | |
79787eaa | 6663 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6664 | wc->flags[level] |= flag; |
6665 | } | |
6666 | ||
6667 | /* | |
6668 | * the block is shared by multiple trees, so it's not good to | |
6669 | * keep the tree lock | |
6670 | */ | |
6671 | if (path->locks[level] && level > 0) { | |
bd681513 | 6672 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6673 | path->locks[level] = 0; |
6674 | } | |
6675 | return 0; | |
6676 | } | |
6677 | ||
1c4850e2 YZ |
6678 | /* |
6679 | * hepler to process tree block pointer. | |
6680 | * | |
6681 | * when wc->stage == DROP_REFERENCE, this function checks | |
6682 | * reference count of the block pointed to. if the block | |
6683 | * is shared and we need update back refs for the subtree | |
6684 | * rooted at the block, this function changes wc->stage to | |
6685 | * UPDATE_BACKREF. if the block is shared and there is no | |
6686 | * need to update back, this function drops the reference | |
6687 | * to the block. | |
6688 | * | |
6689 | * NOTE: return value 1 means we should stop walking down. | |
6690 | */ | |
6691 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
6692 | struct btrfs_root *root, | |
6693 | struct btrfs_path *path, | |
94fcca9f | 6694 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
6695 | { |
6696 | u64 bytenr; | |
6697 | u64 generation; | |
6698 | u64 parent; | |
6699 | u32 blocksize; | |
6700 | struct btrfs_key key; | |
6701 | struct extent_buffer *next; | |
6702 | int level = wc->level; | |
6703 | int reada = 0; | |
6704 | int ret = 0; | |
6705 | ||
6706 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
6707 | path->slots[level]); | |
6708 | /* | |
6709 | * if the lower level block was created before the snapshot | |
6710 | * was created, we know there is no need to update back refs | |
6711 | * for the subtree | |
6712 | */ | |
6713 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
6714 | generation <= root->root_key.offset) { |
6715 | *lookup_info = 1; | |
1c4850e2 | 6716 | return 1; |
94fcca9f | 6717 | } |
1c4850e2 YZ |
6718 | |
6719 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
6720 | blocksize = btrfs_level_size(root, level - 1); | |
6721 | ||
6722 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
6723 | if (!next) { | |
6724 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
6725 | if (!next) |
6726 | return -ENOMEM; | |
1c4850e2 YZ |
6727 | reada = 1; |
6728 | } | |
6729 | btrfs_tree_lock(next); | |
6730 | btrfs_set_lock_blocking(next); | |
6731 | ||
94fcca9f YZ |
6732 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
6733 | &wc->refs[level - 1], | |
6734 | &wc->flags[level - 1]); | |
79787eaa JM |
6735 | if (ret < 0) { |
6736 | btrfs_tree_unlock(next); | |
6737 | return ret; | |
6738 | } | |
6739 | ||
94fcca9f YZ |
6740 | BUG_ON(wc->refs[level - 1] == 0); |
6741 | *lookup_info = 0; | |
1c4850e2 | 6742 | |
94fcca9f | 6743 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 6744 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
6745 | if (level == 1 && |
6746 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6747 | goto skip; | |
6748 | ||
1c4850e2 YZ |
6749 | if (!wc->update_ref || |
6750 | generation <= root->root_key.offset) | |
6751 | goto skip; | |
6752 | ||
6753 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
6754 | path->slots[level]); | |
6755 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
6756 | if (ret < 0) | |
6757 | goto skip; | |
6758 | ||
6759 | wc->stage = UPDATE_BACKREF; | |
6760 | wc->shared_level = level - 1; | |
6761 | } | |
94fcca9f YZ |
6762 | } else { |
6763 | if (level == 1 && | |
6764 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6765 | goto skip; | |
1c4850e2 YZ |
6766 | } |
6767 | ||
b9fab919 | 6768 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
6769 | btrfs_tree_unlock(next); |
6770 | free_extent_buffer(next); | |
6771 | next = NULL; | |
94fcca9f | 6772 | *lookup_info = 1; |
1c4850e2 YZ |
6773 | } |
6774 | ||
6775 | if (!next) { | |
6776 | if (reada && level == 1) | |
6777 | reada_walk_down(trans, root, wc, path); | |
6778 | next = read_tree_block(root, bytenr, blocksize, generation); | |
97d9a8a4 TI |
6779 | if (!next) |
6780 | return -EIO; | |
1c4850e2 YZ |
6781 | btrfs_tree_lock(next); |
6782 | btrfs_set_lock_blocking(next); | |
6783 | } | |
6784 | ||
6785 | level--; | |
6786 | BUG_ON(level != btrfs_header_level(next)); | |
6787 | path->nodes[level] = next; | |
6788 | path->slots[level] = 0; | |
bd681513 | 6789 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
6790 | wc->level = level; |
6791 | if (wc->level == 1) | |
6792 | wc->reada_slot = 0; | |
6793 | return 0; | |
6794 | skip: | |
6795 | wc->refs[level - 1] = 0; | |
6796 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6797 | if (wc->stage == DROP_REFERENCE) { |
6798 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6799 | parent = path->nodes[level]->start; | |
6800 | } else { | |
6801 | BUG_ON(root->root_key.objectid != | |
6802 | btrfs_header_owner(path->nodes[level])); | |
6803 | parent = 0; | |
6804 | } | |
1c4850e2 | 6805 | |
94fcca9f | 6806 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 6807 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 6808 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 6809 | } |
1c4850e2 YZ |
6810 | btrfs_tree_unlock(next); |
6811 | free_extent_buffer(next); | |
94fcca9f | 6812 | *lookup_info = 1; |
1c4850e2 YZ |
6813 | return 1; |
6814 | } | |
6815 | ||
2c47e605 YZ |
6816 | /* |
6817 | * hepler to process tree block while walking up the tree. | |
6818 | * | |
6819 | * when wc->stage == DROP_REFERENCE, this function drops | |
6820 | * reference count on the block. | |
6821 | * | |
6822 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6823 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6824 | * to UPDATE_BACKREF previously while processing the block. | |
6825 | * | |
6826 | * NOTE: return value 1 means we should stop walking up. | |
6827 | */ | |
6828 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6829 | struct btrfs_root *root, | |
6830 | struct btrfs_path *path, | |
6831 | struct walk_control *wc) | |
6832 | { | |
f0486c68 | 6833 | int ret; |
2c47e605 YZ |
6834 | int level = wc->level; |
6835 | struct extent_buffer *eb = path->nodes[level]; | |
6836 | u64 parent = 0; | |
6837 | ||
6838 | if (wc->stage == UPDATE_BACKREF) { | |
6839 | BUG_ON(wc->shared_level < level); | |
6840 | if (level < wc->shared_level) | |
6841 | goto out; | |
6842 | ||
2c47e605 YZ |
6843 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6844 | if (ret > 0) | |
6845 | wc->update_ref = 0; | |
6846 | ||
6847 | wc->stage = DROP_REFERENCE; | |
6848 | wc->shared_level = -1; | |
6849 | path->slots[level] = 0; | |
6850 | ||
6851 | /* | |
6852 | * check reference count again if the block isn't locked. | |
6853 | * we should start walking down the tree again if reference | |
6854 | * count is one. | |
6855 | */ | |
6856 | if (!path->locks[level]) { | |
6857 | BUG_ON(level == 0); | |
6858 | btrfs_tree_lock(eb); | |
6859 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6860 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6861 | |
6862 | ret = btrfs_lookup_extent_info(trans, root, | |
6863 | eb->start, eb->len, | |
6864 | &wc->refs[level], | |
6865 | &wc->flags[level]); | |
79787eaa JM |
6866 | if (ret < 0) { |
6867 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 6868 | path->locks[level] = 0; |
79787eaa JM |
6869 | return ret; |
6870 | } | |
2c47e605 YZ |
6871 | BUG_ON(wc->refs[level] == 0); |
6872 | if (wc->refs[level] == 1) { | |
bd681513 | 6873 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 6874 | path->locks[level] = 0; |
2c47e605 YZ |
6875 | return 1; |
6876 | } | |
f82d02d9 | 6877 | } |
2c47e605 | 6878 | } |
f82d02d9 | 6879 | |
2c47e605 YZ |
6880 | /* wc->stage == DROP_REFERENCE */ |
6881 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6882 | |
2c47e605 YZ |
6883 | if (wc->refs[level] == 1) { |
6884 | if (level == 0) { | |
6885 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
6886 | ret = btrfs_dec_ref(trans, root, eb, 1, |
6887 | wc->for_reloc); | |
2c47e605 | 6888 | else |
66d7e7f0 AJ |
6889 | ret = btrfs_dec_ref(trans, root, eb, 0, |
6890 | wc->for_reloc); | |
79787eaa | 6891 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6892 | } |
6893 | /* make block locked assertion in clean_tree_block happy */ | |
6894 | if (!path->locks[level] && | |
6895 | btrfs_header_generation(eb) == trans->transid) { | |
6896 | btrfs_tree_lock(eb); | |
6897 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6898 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6899 | } |
6900 | clean_tree_block(trans, root, eb); | |
6901 | } | |
6902 | ||
6903 | if (eb == root->node) { | |
6904 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6905 | parent = eb->start; | |
6906 | else | |
6907 | BUG_ON(root->root_key.objectid != | |
6908 | btrfs_header_owner(eb)); | |
6909 | } else { | |
6910 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6911 | parent = path->nodes[level + 1]->start; | |
6912 | else | |
6913 | BUG_ON(root->root_key.objectid != | |
6914 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6915 | } |
f82d02d9 | 6916 | |
5581a51a | 6917 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6918 | out: |
6919 | wc->refs[level] = 0; | |
6920 | wc->flags[level] = 0; | |
f0486c68 | 6921 | return 0; |
2c47e605 YZ |
6922 | } |
6923 | ||
6924 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6925 | struct btrfs_root *root, | |
6926 | struct btrfs_path *path, | |
6927 | struct walk_control *wc) | |
6928 | { | |
2c47e605 | 6929 | int level = wc->level; |
94fcca9f | 6930 | int lookup_info = 1; |
2c47e605 YZ |
6931 | int ret; |
6932 | ||
6933 | while (level >= 0) { | |
94fcca9f | 6934 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6935 | if (ret > 0) |
6936 | break; | |
6937 | ||
6938 | if (level == 0) | |
6939 | break; | |
6940 | ||
7a7965f8 YZ |
6941 | if (path->slots[level] >= |
6942 | btrfs_header_nritems(path->nodes[level])) | |
6943 | break; | |
6944 | ||
94fcca9f | 6945 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6946 | if (ret > 0) { |
6947 | path->slots[level]++; | |
6948 | continue; | |
90d2c51d MX |
6949 | } else if (ret < 0) |
6950 | return ret; | |
1c4850e2 | 6951 | level = wc->level; |
f82d02d9 | 6952 | } |
f82d02d9 YZ |
6953 | return 0; |
6954 | } | |
6955 | ||
d397712b | 6956 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6957 | struct btrfs_root *root, |
f82d02d9 | 6958 | struct btrfs_path *path, |
2c47e605 | 6959 | struct walk_control *wc, int max_level) |
20524f02 | 6960 | { |
2c47e605 | 6961 | int level = wc->level; |
20524f02 | 6962 | int ret; |
9f3a7427 | 6963 | |
2c47e605 YZ |
6964 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6965 | while (level < max_level && path->nodes[level]) { | |
6966 | wc->level = level; | |
6967 | if (path->slots[level] + 1 < | |
6968 | btrfs_header_nritems(path->nodes[level])) { | |
6969 | path->slots[level]++; | |
20524f02 CM |
6970 | return 0; |
6971 | } else { | |
2c47e605 YZ |
6972 | ret = walk_up_proc(trans, root, path, wc); |
6973 | if (ret > 0) | |
6974 | return 0; | |
bd56b302 | 6975 | |
2c47e605 | 6976 | if (path->locks[level]) { |
bd681513 CM |
6977 | btrfs_tree_unlock_rw(path->nodes[level], |
6978 | path->locks[level]); | |
2c47e605 | 6979 | path->locks[level] = 0; |
f82d02d9 | 6980 | } |
2c47e605 YZ |
6981 | free_extent_buffer(path->nodes[level]); |
6982 | path->nodes[level] = NULL; | |
6983 | level++; | |
20524f02 CM |
6984 | } |
6985 | } | |
6986 | return 1; | |
6987 | } | |
6988 | ||
9aca1d51 | 6989 | /* |
2c47e605 YZ |
6990 | * drop a subvolume tree. |
6991 | * | |
6992 | * this function traverses the tree freeing any blocks that only | |
6993 | * referenced by the tree. | |
6994 | * | |
6995 | * when a shared tree block is found. this function decreases its | |
6996 | * reference count by one. if update_ref is true, this function | |
6997 | * also make sure backrefs for the shared block and all lower level | |
6998 | * blocks are properly updated. | |
9aca1d51 | 6999 | */ |
2c536799 | 7000 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7001 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7002 | int for_reloc) | |
20524f02 | 7003 | { |
5caf2a00 | 7004 | struct btrfs_path *path; |
2c47e605 YZ |
7005 | struct btrfs_trans_handle *trans; |
7006 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7007 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7008 | struct walk_control *wc; |
7009 | struct btrfs_key key; | |
7010 | int err = 0; | |
7011 | int ret; | |
7012 | int level; | |
20524f02 | 7013 | |
5caf2a00 | 7014 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7015 | if (!path) { |
7016 | err = -ENOMEM; | |
7017 | goto out; | |
7018 | } | |
20524f02 | 7019 | |
2c47e605 | 7020 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7021 | if (!wc) { |
7022 | btrfs_free_path(path); | |
cb1b69f4 TI |
7023 | err = -ENOMEM; |
7024 | goto out; | |
38a1a919 | 7025 | } |
2c47e605 | 7026 | |
a22285a6 | 7027 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7028 | if (IS_ERR(trans)) { |
7029 | err = PTR_ERR(trans); | |
7030 | goto out_free; | |
7031 | } | |
98d5dc13 | 7032 | |
3fd0a558 YZ |
7033 | if (block_rsv) |
7034 | trans->block_rsv = block_rsv; | |
2c47e605 | 7035 | |
9f3a7427 | 7036 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7037 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7038 | path->nodes[level] = btrfs_lock_root_node(root); |
7039 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7040 | path->slots[level] = 0; |
bd681513 | 7041 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7042 | memset(&wc->update_progress, 0, |
7043 | sizeof(wc->update_progress)); | |
9f3a7427 | 7044 | } else { |
9f3a7427 | 7045 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7046 | memcpy(&wc->update_progress, &key, |
7047 | sizeof(wc->update_progress)); | |
7048 | ||
6702ed49 | 7049 | level = root_item->drop_level; |
2c47e605 | 7050 | BUG_ON(level == 0); |
6702ed49 | 7051 | path->lowest_level = level; |
2c47e605 YZ |
7052 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7053 | path->lowest_level = 0; | |
7054 | if (ret < 0) { | |
7055 | err = ret; | |
79787eaa | 7056 | goto out_end_trans; |
9f3a7427 | 7057 | } |
1c4850e2 | 7058 | WARN_ON(ret > 0); |
2c47e605 | 7059 | |
7d9eb12c CM |
7060 | /* |
7061 | * unlock our path, this is safe because only this | |
7062 | * function is allowed to delete this snapshot | |
7063 | */ | |
5d4f98a2 | 7064 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7065 | |
7066 | level = btrfs_header_level(root->node); | |
7067 | while (1) { | |
7068 | btrfs_tree_lock(path->nodes[level]); | |
7069 | btrfs_set_lock_blocking(path->nodes[level]); | |
7070 | ||
7071 | ret = btrfs_lookup_extent_info(trans, root, | |
7072 | path->nodes[level]->start, | |
7073 | path->nodes[level]->len, | |
7074 | &wc->refs[level], | |
7075 | &wc->flags[level]); | |
79787eaa JM |
7076 | if (ret < 0) { |
7077 | err = ret; | |
7078 | goto out_end_trans; | |
7079 | } | |
2c47e605 YZ |
7080 | BUG_ON(wc->refs[level] == 0); |
7081 | ||
7082 | if (level == root_item->drop_level) | |
7083 | break; | |
7084 | ||
7085 | btrfs_tree_unlock(path->nodes[level]); | |
7086 | WARN_ON(wc->refs[level] != 1); | |
7087 | level--; | |
7088 | } | |
9f3a7427 | 7089 | } |
2c47e605 YZ |
7090 | |
7091 | wc->level = level; | |
7092 | wc->shared_level = -1; | |
7093 | wc->stage = DROP_REFERENCE; | |
7094 | wc->update_ref = update_ref; | |
7095 | wc->keep_locks = 0; | |
66d7e7f0 | 7096 | wc->for_reloc = for_reloc; |
1c4850e2 | 7097 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7098 | |
d397712b | 7099 | while (1) { |
2c47e605 YZ |
7100 | ret = walk_down_tree(trans, root, path, wc); |
7101 | if (ret < 0) { | |
7102 | err = ret; | |
20524f02 | 7103 | break; |
2c47e605 | 7104 | } |
9aca1d51 | 7105 | |
2c47e605 YZ |
7106 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7107 | if (ret < 0) { | |
7108 | err = ret; | |
20524f02 | 7109 | break; |
2c47e605 YZ |
7110 | } |
7111 | ||
7112 | if (ret > 0) { | |
7113 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7114 | break; |
7115 | } | |
2c47e605 YZ |
7116 | |
7117 | if (wc->stage == DROP_REFERENCE) { | |
7118 | level = wc->level; | |
7119 | btrfs_node_key(path->nodes[level], | |
7120 | &root_item->drop_progress, | |
7121 | path->slots[level]); | |
7122 | root_item->drop_level = level; | |
7123 | } | |
7124 | ||
7125 | BUG_ON(wc->level == 0); | |
3fd0a558 | 7126 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
7127 | ret = btrfs_update_root(trans, tree_root, |
7128 | &root->root_key, | |
7129 | root_item); | |
79787eaa JM |
7130 | if (ret) { |
7131 | btrfs_abort_transaction(trans, tree_root, ret); | |
7132 | err = ret; | |
7133 | goto out_end_trans; | |
7134 | } | |
2c47e605 | 7135 | |
3fd0a558 | 7136 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 7137 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7138 | if (IS_ERR(trans)) { |
7139 | err = PTR_ERR(trans); | |
7140 | goto out_free; | |
7141 | } | |
3fd0a558 YZ |
7142 | if (block_rsv) |
7143 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7144 | } |
20524f02 | 7145 | } |
b3b4aa74 | 7146 | btrfs_release_path(path); |
79787eaa JM |
7147 | if (err) |
7148 | goto out_end_trans; | |
2c47e605 YZ |
7149 | |
7150 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7151 | if (ret) { |
7152 | btrfs_abort_transaction(trans, tree_root, ret); | |
7153 | goto out_end_trans; | |
7154 | } | |
2c47e605 | 7155 | |
76dda93c YZ |
7156 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
7157 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
7158 | NULL, NULL); | |
79787eaa JM |
7159 | if (ret < 0) { |
7160 | btrfs_abort_transaction(trans, tree_root, ret); | |
7161 | err = ret; | |
7162 | goto out_end_trans; | |
7163 | } else if (ret > 0) { | |
84cd948c JB |
7164 | /* if we fail to delete the orphan item this time |
7165 | * around, it'll get picked up the next time. | |
7166 | * | |
7167 | * The most common failure here is just -ENOENT. | |
7168 | */ | |
7169 | btrfs_del_orphan_item(trans, tree_root, | |
7170 | root->root_key.objectid); | |
76dda93c YZ |
7171 | } |
7172 | } | |
7173 | ||
7174 | if (root->in_radix) { | |
7175 | btrfs_free_fs_root(tree_root->fs_info, root); | |
7176 | } else { | |
7177 | free_extent_buffer(root->node); | |
7178 | free_extent_buffer(root->commit_root); | |
7179 | kfree(root); | |
7180 | } | |
79787eaa | 7181 | out_end_trans: |
3fd0a558 | 7182 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7183 | out_free: |
2c47e605 | 7184 | kfree(wc); |
5caf2a00 | 7185 | btrfs_free_path(path); |
cb1b69f4 TI |
7186 | out: |
7187 | if (err) | |
7188 | btrfs_std_error(root->fs_info, err); | |
2c536799 | 7189 | return err; |
20524f02 | 7190 | } |
9078a3e1 | 7191 | |
2c47e605 YZ |
7192 | /* |
7193 | * drop subtree rooted at tree block 'node'. | |
7194 | * | |
7195 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7196 | * only used by relocation code |
2c47e605 | 7197 | */ |
f82d02d9 YZ |
7198 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7199 | struct btrfs_root *root, | |
7200 | struct extent_buffer *node, | |
7201 | struct extent_buffer *parent) | |
7202 | { | |
7203 | struct btrfs_path *path; | |
2c47e605 | 7204 | struct walk_control *wc; |
f82d02d9 YZ |
7205 | int level; |
7206 | int parent_level; | |
7207 | int ret = 0; | |
7208 | int wret; | |
7209 | ||
2c47e605 YZ |
7210 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7211 | ||
f82d02d9 | 7212 | path = btrfs_alloc_path(); |
db5b493a TI |
7213 | if (!path) |
7214 | return -ENOMEM; | |
f82d02d9 | 7215 | |
2c47e605 | 7216 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7217 | if (!wc) { |
7218 | btrfs_free_path(path); | |
7219 | return -ENOMEM; | |
7220 | } | |
2c47e605 | 7221 | |
b9447ef8 | 7222 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7223 | parent_level = btrfs_header_level(parent); |
7224 | extent_buffer_get(parent); | |
7225 | path->nodes[parent_level] = parent; | |
7226 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7227 | ||
b9447ef8 | 7228 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7229 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7230 | path->nodes[level] = node; |
7231 | path->slots[level] = 0; | |
bd681513 | 7232 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7233 | |
7234 | wc->refs[parent_level] = 1; | |
7235 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7236 | wc->level = level; | |
7237 | wc->shared_level = -1; | |
7238 | wc->stage = DROP_REFERENCE; | |
7239 | wc->update_ref = 0; | |
7240 | wc->keep_locks = 1; | |
66d7e7f0 | 7241 | wc->for_reloc = 1; |
1c4850e2 | 7242 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7243 | |
7244 | while (1) { | |
2c47e605 YZ |
7245 | wret = walk_down_tree(trans, root, path, wc); |
7246 | if (wret < 0) { | |
f82d02d9 | 7247 | ret = wret; |
f82d02d9 | 7248 | break; |
2c47e605 | 7249 | } |
f82d02d9 | 7250 | |
2c47e605 | 7251 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7252 | if (wret < 0) |
7253 | ret = wret; | |
7254 | if (wret != 0) | |
7255 | break; | |
7256 | } | |
7257 | ||
2c47e605 | 7258 | kfree(wc); |
f82d02d9 YZ |
7259 | btrfs_free_path(path); |
7260 | return ret; | |
7261 | } | |
7262 | ||
ec44a35c CM |
7263 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7264 | { | |
7265 | u64 num_devices; | |
fc67c450 | 7266 | u64 stripped; |
e4d8ec0f | 7267 | |
fc67c450 ID |
7268 | /* |
7269 | * if restripe for this chunk_type is on pick target profile and | |
7270 | * return, otherwise do the usual balance | |
7271 | */ | |
7272 | stripped = get_restripe_target(root->fs_info, flags); | |
7273 | if (stripped) | |
7274 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7275 | |
cd02dca5 CM |
7276 | /* |
7277 | * we add in the count of missing devices because we want | |
7278 | * to make sure that any RAID levels on a degraded FS | |
7279 | * continue to be honored. | |
7280 | */ | |
7281 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7282 | root->fs_info->fs_devices->missing_devices; | |
7283 | ||
fc67c450 ID |
7284 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
7285 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
7286 | ||
ec44a35c CM |
7287 | if (num_devices == 1) { |
7288 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7289 | stripped = flags & ~stripped; | |
7290 | ||
7291 | /* turn raid0 into single device chunks */ | |
7292 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7293 | return stripped; | |
7294 | ||
7295 | /* turn mirroring into duplication */ | |
7296 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7297 | BTRFS_BLOCK_GROUP_RAID10)) | |
7298 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7299 | } else { |
7300 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7301 | if (flags & stripped) |
7302 | return flags; | |
7303 | ||
7304 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7305 | stripped = flags & ~stripped; | |
7306 | ||
7307 | /* switch duplicated blocks with raid1 */ | |
7308 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7309 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7310 | ||
e3176ca2 | 7311 | /* this is drive concat, leave it alone */ |
ec44a35c | 7312 | } |
e3176ca2 | 7313 | |
ec44a35c CM |
7314 | return flags; |
7315 | } | |
7316 | ||
199c36ea | 7317 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7318 | { |
f0486c68 YZ |
7319 | struct btrfs_space_info *sinfo = cache->space_info; |
7320 | u64 num_bytes; | |
199c36ea | 7321 | u64 min_allocable_bytes; |
f0486c68 | 7322 | int ret = -ENOSPC; |
0ef3e66b | 7323 | |
c286ac48 | 7324 | |
199c36ea MX |
7325 | /* |
7326 | * We need some metadata space and system metadata space for | |
7327 | * allocating chunks in some corner cases until we force to set | |
7328 | * it to be readonly. | |
7329 | */ | |
7330 | if ((sinfo->flags & | |
7331 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7332 | !force) | |
7333 | min_allocable_bytes = 1 * 1024 * 1024; | |
7334 | else | |
7335 | min_allocable_bytes = 0; | |
7336 | ||
f0486c68 YZ |
7337 | spin_lock(&sinfo->lock); |
7338 | spin_lock(&cache->lock); | |
61cfea9b W |
7339 | |
7340 | if (cache->ro) { | |
7341 | ret = 0; | |
7342 | goto out; | |
7343 | } | |
7344 | ||
f0486c68 YZ |
7345 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7346 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7347 | ||
7348 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7349 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7350 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7351 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7352 | cache->ro = 1; |
7353 | ret = 0; | |
7354 | } | |
61cfea9b | 7355 | out: |
f0486c68 YZ |
7356 | spin_unlock(&cache->lock); |
7357 | spin_unlock(&sinfo->lock); | |
7358 | return ret; | |
7359 | } | |
7d9eb12c | 7360 | |
f0486c68 YZ |
7361 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7362 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7363 | |
f0486c68 YZ |
7364 | { |
7365 | struct btrfs_trans_handle *trans; | |
7366 | u64 alloc_flags; | |
7367 | int ret; | |
7d9eb12c | 7368 | |
f0486c68 | 7369 | BUG_ON(cache->ro); |
0ef3e66b | 7370 | |
ff5714cc | 7371 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7372 | if (IS_ERR(trans)) |
7373 | return PTR_ERR(trans); | |
5d4f98a2 | 7374 | |
f0486c68 | 7375 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7376 | if (alloc_flags != cache->flags) { |
698d0082 | 7377 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7378 | CHUNK_ALLOC_FORCE); |
7379 | if (ret < 0) | |
7380 | goto out; | |
7381 | } | |
5d4f98a2 | 7382 | |
199c36ea | 7383 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7384 | if (!ret) |
7385 | goto out; | |
7386 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7387 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7388 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7389 | if (ret < 0) |
7390 | goto out; | |
199c36ea | 7391 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7392 | out: |
7393 | btrfs_end_transaction(trans, root); | |
7394 | return ret; | |
7395 | } | |
5d4f98a2 | 7396 | |
c87f08ca CM |
7397 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7398 | struct btrfs_root *root, u64 type) | |
7399 | { | |
7400 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7401 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7402 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7403 | } |
7404 | ||
6d07bcec MX |
7405 | /* |
7406 | * helper to account the unused space of all the readonly block group in the | |
7407 | * list. takes mirrors into account. | |
7408 | */ | |
7409 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7410 | { | |
7411 | struct btrfs_block_group_cache *block_group; | |
7412 | u64 free_bytes = 0; | |
7413 | int factor; | |
7414 | ||
7415 | list_for_each_entry(block_group, groups_list, list) { | |
7416 | spin_lock(&block_group->lock); | |
7417 | ||
7418 | if (!block_group->ro) { | |
7419 | spin_unlock(&block_group->lock); | |
7420 | continue; | |
7421 | } | |
7422 | ||
7423 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7424 | BTRFS_BLOCK_GROUP_RAID10 | | |
7425 | BTRFS_BLOCK_GROUP_DUP)) | |
7426 | factor = 2; | |
7427 | else | |
7428 | factor = 1; | |
7429 | ||
7430 | free_bytes += (block_group->key.offset - | |
7431 | btrfs_block_group_used(&block_group->item)) * | |
7432 | factor; | |
7433 | ||
7434 | spin_unlock(&block_group->lock); | |
7435 | } | |
7436 | ||
7437 | return free_bytes; | |
7438 | } | |
7439 | ||
7440 | /* | |
7441 | * helper to account the unused space of all the readonly block group in the | |
7442 | * space_info. takes mirrors into account. | |
7443 | */ | |
7444 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
7445 | { | |
7446 | int i; | |
7447 | u64 free_bytes = 0; | |
7448 | ||
7449 | spin_lock(&sinfo->lock); | |
7450 | ||
7451 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
7452 | if (!list_empty(&sinfo->block_groups[i])) | |
7453 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
7454 | &sinfo->block_groups[i]); | |
7455 | ||
7456 | spin_unlock(&sinfo->lock); | |
7457 | ||
7458 | return free_bytes; | |
7459 | } | |
7460 | ||
143bede5 | 7461 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 7462 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 7463 | { |
f0486c68 YZ |
7464 | struct btrfs_space_info *sinfo = cache->space_info; |
7465 | u64 num_bytes; | |
7466 | ||
7467 | BUG_ON(!cache->ro); | |
7468 | ||
7469 | spin_lock(&sinfo->lock); | |
7470 | spin_lock(&cache->lock); | |
7471 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7472 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7473 | sinfo->bytes_readonly -= num_bytes; | |
7474 | cache->ro = 0; | |
7475 | spin_unlock(&cache->lock); | |
7476 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7477 | } |
7478 | ||
ba1bf481 JB |
7479 | /* |
7480 | * checks to see if its even possible to relocate this block group. | |
7481 | * | |
7482 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7483 | * ok to go ahead and try. | |
7484 | */ | |
7485 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7486 | { |
ba1bf481 JB |
7487 | struct btrfs_block_group_cache *block_group; |
7488 | struct btrfs_space_info *space_info; | |
7489 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7490 | struct btrfs_device *device; | |
cdcb725c | 7491 | u64 min_free; |
6719db6a JB |
7492 | u64 dev_min = 1; |
7493 | u64 dev_nr = 0; | |
4a5e98f5 | 7494 | u64 target; |
cdcb725c | 7495 | int index; |
ba1bf481 JB |
7496 | int full = 0; |
7497 | int ret = 0; | |
1a40e23b | 7498 | |
ba1bf481 | 7499 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7500 | |
ba1bf481 JB |
7501 | /* odd, couldn't find the block group, leave it alone */ |
7502 | if (!block_group) | |
7503 | return -1; | |
1a40e23b | 7504 | |
cdcb725c | 7505 | min_free = btrfs_block_group_used(&block_group->item); |
7506 | ||
ba1bf481 | 7507 | /* no bytes used, we're good */ |
cdcb725c | 7508 | if (!min_free) |
1a40e23b ZY |
7509 | goto out; |
7510 | ||
ba1bf481 JB |
7511 | space_info = block_group->space_info; |
7512 | spin_lock(&space_info->lock); | |
17d217fe | 7513 | |
ba1bf481 | 7514 | full = space_info->full; |
17d217fe | 7515 | |
ba1bf481 JB |
7516 | /* |
7517 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7518 | * relocate it unless we're able to allocate a new chunk below. |
7519 | * | |
7520 | * Otherwise, we need to make sure we have room in the space to handle | |
7521 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7522 | */ |
7ce618db | 7523 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 7524 | (space_info->bytes_used + space_info->bytes_reserved + |
7525 | space_info->bytes_pinned + space_info->bytes_readonly + | |
7526 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
7527 | spin_unlock(&space_info->lock); |
7528 | goto out; | |
17d217fe | 7529 | } |
ba1bf481 | 7530 | spin_unlock(&space_info->lock); |
ea8c2819 | 7531 | |
ba1bf481 JB |
7532 | /* |
7533 | * ok we don't have enough space, but maybe we have free space on our | |
7534 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
7535 | * alloc devices and guess if we have enough space. if this block |
7536 | * group is going to be restriped, run checks against the target | |
7537 | * profile instead of the current one. | |
ba1bf481 JB |
7538 | */ |
7539 | ret = -1; | |
ea8c2819 | 7540 | |
cdcb725c | 7541 | /* |
7542 | * index: | |
7543 | * 0: raid10 | |
7544 | * 1: raid1 | |
7545 | * 2: dup | |
7546 | * 3: raid0 | |
7547 | * 4: single | |
7548 | */ | |
4a5e98f5 ID |
7549 | target = get_restripe_target(root->fs_info, block_group->flags); |
7550 | if (target) { | |
31e50229 | 7551 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
7552 | } else { |
7553 | /* | |
7554 | * this is just a balance, so if we were marked as full | |
7555 | * we know there is no space for a new chunk | |
7556 | */ | |
7557 | if (full) | |
7558 | goto out; | |
7559 | ||
7560 | index = get_block_group_index(block_group); | |
7561 | } | |
7562 | ||
e6ec716f | 7563 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 7564 | dev_min = 4; |
6719db6a JB |
7565 | /* Divide by 2 */ |
7566 | min_free >>= 1; | |
e6ec716f | 7567 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 7568 | dev_min = 2; |
e6ec716f | 7569 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
7570 | /* Multiply by 2 */ |
7571 | min_free <<= 1; | |
e6ec716f | 7572 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 7573 | dev_min = fs_devices->rw_devices; |
6719db6a | 7574 | do_div(min_free, dev_min); |
cdcb725c | 7575 | } |
7576 | ||
ba1bf481 JB |
7577 | mutex_lock(&root->fs_info->chunk_mutex); |
7578 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 7579 | u64 dev_offset; |
56bec294 | 7580 | |
ba1bf481 JB |
7581 | /* |
7582 | * check to make sure we can actually find a chunk with enough | |
7583 | * space to fit our block group in. | |
7584 | */ | |
63a212ab SB |
7585 | if (device->total_bytes > device->bytes_used + min_free && |
7586 | !device->is_tgtdev_for_dev_replace) { | |
125ccb0a | 7587 | ret = find_free_dev_extent(device, min_free, |
7bfc837d | 7588 | &dev_offset, NULL); |
ba1bf481 | 7589 | if (!ret) |
cdcb725c | 7590 | dev_nr++; |
7591 | ||
7592 | if (dev_nr >= dev_min) | |
73e48b27 | 7593 | break; |
cdcb725c | 7594 | |
ba1bf481 | 7595 | ret = -1; |
725c8463 | 7596 | } |
edbd8d4e | 7597 | } |
ba1bf481 | 7598 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 7599 | out: |
ba1bf481 | 7600 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
7601 | return ret; |
7602 | } | |
7603 | ||
b2950863 CH |
7604 | static int find_first_block_group(struct btrfs_root *root, |
7605 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7606 | { |
925baedd | 7607 | int ret = 0; |
0b86a832 CM |
7608 | struct btrfs_key found_key; |
7609 | struct extent_buffer *leaf; | |
7610 | int slot; | |
edbd8d4e | 7611 | |
0b86a832 CM |
7612 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7613 | if (ret < 0) | |
925baedd CM |
7614 | goto out; |
7615 | ||
d397712b | 7616 | while (1) { |
0b86a832 | 7617 | slot = path->slots[0]; |
edbd8d4e | 7618 | leaf = path->nodes[0]; |
0b86a832 CM |
7619 | if (slot >= btrfs_header_nritems(leaf)) { |
7620 | ret = btrfs_next_leaf(root, path); | |
7621 | if (ret == 0) | |
7622 | continue; | |
7623 | if (ret < 0) | |
925baedd | 7624 | goto out; |
0b86a832 | 7625 | break; |
edbd8d4e | 7626 | } |
0b86a832 | 7627 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7628 | |
0b86a832 | 7629 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7630 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7631 | ret = 0; | |
7632 | goto out; | |
7633 | } | |
0b86a832 | 7634 | path->slots[0]++; |
edbd8d4e | 7635 | } |
925baedd | 7636 | out: |
0b86a832 | 7637 | return ret; |
edbd8d4e CM |
7638 | } |
7639 | ||
0af3d00b JB |
7640 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
7641 | { | |
7642 | struct btrfs_block_group_cache *block_group; | |
7643 | u64 last = 0; | |
7644 | ||
7645 | while (1) { | |
7646 | struct inode *inode; | |
7647 | ||
7648 | block_group = btrfs_lookup_first_block_group(info, last); | |
7649 | while (block_group) { | |
7650 | spin_lock(&block_group->lock); | |
7651 | if (block_group->iref) | |
7652 | break; | |
7653 | spin_unlock(&block_group->lock); | |
7654 | block_group = next_block_group(info->tree_root, | |
7655 | block_group); | |
7656 | } | |
7657 | if (!block_group) { | |
7658 | if (last == 0) | |
7659 | break; | |
7660 | last = 0; | |
7661 | continue; | |
7662 | } | |
7663 | ||
7664 | inode = block_group->inode; | |
7665 | block_group->iref = 0; | |
7666 | block_group->inode = NULL; | |
7667 | spin_unlock(&block_group->lock); | |
7668 | iput(inode); | |
7669 | last = block_group->key.objectid + block_group->key.offset; | |
7670 | btrfs_put_block_group(block_group); | |
7671 | } | |
7672 | } | |
7673 | ||
1a40e23b ZY |
7674 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
7675 | { | |
7676 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 7677 | struct btrfs_space_info *space_info; |
11833d66 | 7678 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
7679 | struct rb_node *n; |
7680 | ||
11833d66 YZ |
7681 | down_write(&info->extent_commit_sem); |
7682 | while (!list_empty(&info->caching_block_groups)) { | |
7683 | caching_ctl = list_entry(info->caching_block_groups.next, | |
7684 | struct btrfs_caching_control, list); | |
7685 | list_del(&caching_ctl->list); | |
7686 | put_caching_control(caching_ctl); | |
7687 | } | |
7688 | up_write(&info->extent_commit_sem); | |
7689 | ||
1a40e23b ZY |
7690 | spin_lock(&info->block_group_cache_lock); |
7691 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
7692 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
7693 | cache_node); | |
1a40e23b ZY |
7694 | rb_erase(&block_group->cache_node, |
7695 | &info->block_group_cache_tree); | |
d899e052 YZ |
7696 | spin_unlock(&info->block_group_cache_lock); |
7697 | ||
80eb234a | 7698 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 7699 | list_del(&block_group->list); |
80eb234a | 7700 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 7701 | |
817d52f8 | 7702 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7703 | wait_block_group_cache_done(block_group); |
817d52f8 | 7704 | |
3c14874a JB |
7705 | /* |
7706 | * We haven't cached this block group, which means we could | |
7707 | * possibly have excluded extents on this block group. | |
7708 | */ | |
7709 | if (block_group->cached == BTRFS_CACHE_NO) | |
7710 | free_excluded_extents(info->extent_root, block_group); | |
7711 | ||
817d52f8 | 7712 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 7713 | btrfs_put_block_group(block_group); |
d899e052 YZ |
7714 | |
7715 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
7716 | } |
7717 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
7718 | |
7719 | /* now that all the block groups are freed, go through and | |
7720 | * free all the space_info structs. This is only called during | |
7721 | * the final stages of unmount, and so we know nobody is | |
7722 | * using them. We call synchronize_rcu() once before we start, | |
7723 | * just to be on the safe side. | |
7724 | */ | |
7725 | synchronize_rcu(); | |
7726 | ||
8929ecfa YZ |
7727 | release_global_block_rsv(info); |
7728 | ||
4184ea7f CM |
7729 | while(!list_empty(&info->space_info)) { |
7730 | space_info = list_entry(info->space_info.next, | |
7731 | struct btrfs_space_info, | |
7732 | list); | |
f0486c68 | 7733 | if (space_info->bytes_pinned > 0 || |
fb25e914 JB |
7734 | space_info->bytes_reserved > 0 || |
7735 | space_info->bytes_may_use > 0) { | |
f0486c68 YZ |
7736 | WARN_ON(1); |
7737 | dump_space_info(space_info, 0, 0); | |
7738 | } | |
4184ea7f CM |
7739 | list_del(&space_info->list); |
7740 | kfree(space_info); | |
7741 | } | |
1a40e23b ZY |
7742 | return 0; |
7743 | } | |
7744 | ||
b742bb82 YZ |
7745 | static void __link_block_group(struct btrfs_space_info *space_info, |
7746 | struct btrfs_block_group_cache *cache) | |
7747 | { | |
7748 | int index = get_block_group_index(cache); | |
7749 | ||
7750 | down_write(&space_info->groups_sem); | |
7751 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
7752 | up_write(&space_info->groups_sem); | |
7753 | } | |
7754 | ||
9078a3e1 CM |
7755 | int btrfs_read_block_groups(struct btrfs_root *root) |
7756 | { | |
7757 | struct btrfs_path *path; | |
7758 | int ret; | |
9078a3e1 | 7759 | struct btrfs_block_group_cache *cache; |
be744175 | 7760 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7761 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7762 | struct btrfs_key key; |
7763 | struct btrfs_key found_key; | |
5f39d397 | 7764 | struct extent_buffer *leaf; |
0af3d00b JB |
7765 | int need_clear = 0; |
7766 | u64 cache_gen; | |
96b5179d | 7767 | |
be744175 | 7768 | root = info->extent_root; |
9078a3e1 | 7769 | key.objectid = 0; |
0b86a832 | 7770 | key.offset = 0; |
9078a3e1 | 7771 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7772 | path = btrfs_alloc_path(); |
7773 | if (!path) | |
7774 | return -ENOMEM; | |
026fd317 | 7775 | path->reada = 1; |
9078a3e1 | 7776 | |
6c41761f | 7777 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 7778 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 7779 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 7780 | need_clear = 1; |
88c2ba3b JB |
7781 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
7782 | need_clear = 1; | |
0af3d00b | 7783 | |
d397712b | 7784 | while (1) { |
0b86a832 | 7785 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
7786 | if (ret > 0) |
7787 | break; | |
0b86a832 CM |
7788 | if (ret != 0) |
7789 | goto error; | |
5f39d397 CM |
7790 | leaf = path->nodes[0]; |
7791 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7792 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7793 | if (!cache) { |
0b86a832 | 7794 | ret = -ENOMEM; |
f0486c68 | 7795 | goto error; |
9078a3e1 | 7796 | } |
34d52cb6 LZ |
7797 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7798 | GFP_NOFS); | |
7799 | if (!cache->free_space_ctl) { | |
7800 | kfree(cache); | |
7801 | ret = -ENOMEM; | |
7802 | goto error; | |
7803 | } | |
3e1ad54f | 7804 | |
d2fb3437 | 7805 | atomic_set(&cache->count, 1); |
c286ac48 | 7806 | spin_lock_init(&cache->lock); |
817d52f8 | 7807 | cache->fs_info = info; |
0f9dd46c | 7808 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7809 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 7810 | |
cf7c1ef6 LB |
7811 | if (need_clear) { |
7812 | /* | |
7813 | * When we mount with old space cache, we need to | |
7814 | * set BTRFS_DC_CLEAR and set dirty flag. | |
7815 | * | |
7816 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
7817 | * truncate the old free space cache inode and | |
7818 | * setup a new one. | |
7819 | * b) Setting 'dirty flag' makes sure that we flush | |
7820 | * the new space cache info onto disk. | |
7821 | */ | |
0af3d00b | 7822 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
7823 | if (btrfs_test_opt(root, SPACE_CACHE)) |
7824 | cache->dirty = 1; | |
7825 | } | |
0af3d00b | 7826 | |
5f39d397 CM |
7827 | read_extent_buffer(leaf, &cache->item, |
7828 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7829 | sizeof(cache->item)); | |
9078a3e1 | 7830 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7831 | |
9078a3e1 | 7832 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 7833 | btrfs_release_path(path); |
0b86a832 | 7834 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
7835 | cache->sectorsize = root->sectorsize; |
7836 | ||
34d52cb6 LZ |
7837 | btrfs_init_free_space_ctl(cache); |
7838 | ||
3c14874a JB |
7839 | /* |
7840 | * We need to exclude the super stripes now so that the space | |
7841 | * info has super bytes accounted for, otherwise we'll think | |
7842 | * we have more space than we actually do. | |
7843 | */ | |
7844 | exclude_super_stripes(root, cache); | |
7845 | ||
817d52f8 JB |
7846 | /* |
7847 | * check for two cases, either we are full, and therefore | |
7848 | * don't need to bother with the caching work since we won't | |
7849 | * find any space, or we are empty, and we can just add all | |
7850 | * the space in and be done with it. This saves us _alot_ of | |
7851 | * time, particularly in the full case. | |
7852 | */ | |
7853 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 7854 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7855 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 7856 | free_excluded_extents(root, cache); |
817d52f8 | 7857 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 7858 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
7859 | cache->cached = BTRFS_CACHE_FINISHED; |
7860 | add_new_free_space(cache, root->fs_info, | |
7861 | found_key.objectid, | |
7862 | found_key.objectid + | |
7863 | found_key.offset); | |
11833d66 | 7864 | free_excluded_extents(root, cache); |
817d52f8 | 7865 | } |
96b5179d | 7866 | |
6324fbf3 CM |
7867 | ret = update_space_info(info, cache->flags, found_key.offset, |
7868 | btrfs_block_group_used(&cache->item), | |
7869 | &space_info); | |
79787eaa | 7870 | BUG_ON(ret); /* -ENOMEM */ |
6324fbf3 | 7871 | cache->space_info = space_info; |
1b2da372 | 7872 | spin_lock(&cache->space_info->lock); |
f0486c68 | 7873 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7874 | spin_unlock(&cache->space_info->lock); |
7875 | ||
b742bb82 | 7876 | __link_block_group(space_info, cache); |
0f9dd46c JB |
7877 | |
7878 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
79787eaa | 7879 | BUG_ON(ret); /* Logic error */ |
75ccf47d CM |
7880 | |
7881 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 7882 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 7883 | set_block_group_ro(cache, 1); |
9078a3e1 | 7884 | } |
b742bb82 YZ |
7885 | |
7886 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
7887 | if (!(get_alloc_profile(root, space_info->flags) & | |
7888 | (BTRFS_BLOCK_GROUP_RAID10 | | |
7889 | BTRFS_BLOCK_GROUP_RAID1 | | |
7890 | BTRFS_BLOCK_GROUP_DUP))) | |
7891 | continue; | |
7892 | /* | |
7893 | * avoid allocating from un-mirrored block group if there are | |
7894 | * mirrored block groups. | |
7895 | */ | |
7896 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 7897 | set_block_group_ro(cache, 1); |
b742bb82 | 7898 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 7899 | set_block_group_ro(cache, 1); |
9078a3e1 | 7900 | } |
f0486c68 YZ |
7901 | |
7902 | init_global_block_rsv(info); | |
0b86a832 CM |
7903 | ret = 0; |
7904 | error: | |
9078a3e1 | 7905 | btrfs_free_path(path); |
0b86a832 | 7906 | return ret; |
9078a3e1 | 7907 | } |
6324fbf3 | 7908 | |
ea658bad JB |
7909 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
7910 | struct btrfs_root *root) | |
7911 | { | |
7912 | struct btrfs_block_group_cache *block_group, *tmp; | |
7913 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
7914 | struct btrfs_block_group_item item; | |
7915 | struct btrfs_key key; | |
7916 | int ret = 0; | |
7917 | ||
7918 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
7919 | new_bg_list) { | |
7920 | list_del_init(&block_group->new_bg_list); | |
7921 | ||
7922 | if (ret) | |
7923 | continue; | |
7924 | ||
7925 | spin_lock(&block_group->lock); | |
7926 | memcpy(&item, &block_group->item, sizeof(item)); | |
7927 | memcpy(&key, &block_group->key, sizeof(key)); | |
7928 | spin_unlock(&block_group->lock); | |
7929 | ||
7930 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
7931 | sizeof(item)); | |
7932 | if (ret) | |
7933 | btrfs_abort_transaction(trans, extent_root, ret); | |
7934 | } | |
7935 | } | |
7936 | ||
6324fbf3 CM |
7937 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
7938 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7939 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7940 | u64 size) |
7941 | { | |
7942 | int ret; | |
6324fbf3 CM |
7943 | struct btrfs_root *extent_root; |
7944 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7945 | |
7946 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7947 | |
12fcfd22 | 7948 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 7949 | |
8f18cf13 | 7950 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
7951 | if (!cache) |
7952 | return -ENOMEM; | |
34d52cb6 LZ |
7953 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7954 | GFP_NOFS); | |
7955 | if (!cache->free_space_ctl) { | |
7956 | kfree(cache); | |
7957 | return -ENOMEM; | |
7958 | } | |
0f9dd46c | 7959 | |
e17cade2 | 7960 | cache->key.objectid = chunk_offset; |
6324fbf3 | 7961 | cache->key.offset = size; |
d2fb3437 | 7962 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 7963 | cache->sectorsize = root->sectorsize; |
0af3d00b | 7964 | cache->fs_info = root->fs_info; |
96303081 | 7965 | |
d2fb3437 | 7966 | atomic_set(&cache->count, 1); |
c286ac48 | 7967 | spin_lock_init(&cache->lock); |
0f9dd46c | 7968 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7969 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 7970 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 7971 | |
34d52cb6 LZ |
7972 | btrfs_init_free_space_ctl(cache); |
7973 | ||
6324fbf3 | 7974 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
7975 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
7976 | cache->flags = type; | |
7977 | btrfs_set_block_group_flags(&cache->item, type); | |
7978 | ||
11833d66 | 7979 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7980 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 7981 | exclude_super_stripes(root, cache); |
96303081 | 7982 | |
817d52f8 JB |
7983 | add_new_free_space(cache, root->fs_info, chunk_offset, |
7984 | chunk_offset + size); | |
7985 | ||
11833d66 YZ |
7986 | free_excluded_extents(root, cache); |
7987 | ||
6324fbf3 CM |
7988 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
7989 | &cache->space_info); | |
79787eaa | 7990 | BUG_ON(ret); /* -ENOMEM */ |
c7c144db | 7991 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
7992 | |
7993 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 7994 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7995 | spin_unlock(&cache->space_info->lock); |
7996 | ||
b742bb82 | 7997 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 7998 | |
0f9dd46c | 7999 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
79787eaa | 8000 | BUG_ON(ret); /* Logic error */ |
c286ac48 | 8001 | |
ea658bad | 8002 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8003 | |
d18a2c44 | 8004 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8005 | |
6324fbf3 CM |
8006 | return 0; |
8007 | } | |
1a40e23b | 8008 | |
10ea00f5 ID |
8009 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8010 | { | |
899c81ea ID |
8011 | u64 extra_flags = chunk_to_extended(flags) & |
8012 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8013 | |
de98ced9 | 8014 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8015 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8016 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8017 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8018 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8019 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8020 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8021 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8022 | } |
8023 | ||
1a40e23b ZY |
8024 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8025 | struct btrfs_root *root, u64 group_start) | |
8026 | { | |
8027 | struct btrfs_path *path; | |
8028 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8029 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8030 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8031 | struct btrfs_key key; |
0af3d00b | 8032 | struct inode *inode; |
1a40e23b | 8033 | int ret; |
10ea00f5 | 8034 | int index; |
89a55897 | 8035 | int factor; |
1a40e23b | 8036 | |
1a40e23b ZY |
8037 | root = root->fs_info->extent_root; |
8038 | ||
8039 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8040 | BUG_ON(!block_group); | |
c146afad | 8041 | BUG_ON(!block_group->ro); |
1a40e23b | 8042 | |
9f7c43c9 | 8043 | /* |
8044 | * Free the reserved super bytes from this block group before | |
8045 | * remove it. | |
8046 | */ | |
8047 | free_excluded_extents(root, block_group); | |
8048 | ||
1a40e23b | 8049 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8050 | index = get_block_group_index(block_group); |
89a55897 JB |
8051 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8052 | BTRFS_BLOCK_GROUP_RAID1 | | |
8053 | BTRFS_BLOCK_GROUP_RAID10)) | |
8054 | factor = 2; | |
8055 | else | |
8056 | factor = 1; | |
1a40e23b | 8057 | |
44fb5511 CM |
8058 | /* make sure this block group isn't part of an allocation cluster */ |
8059 | cluster = &root->fs_info->data_alloc_cluster; | |
8060 | spin_lock(&cluster->refill_lock); | |
8061 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8062 | spin_unlock(&cluster->refill_lock); | |
8063 | ||
8064 | /* | |
8065 | * make sure this block group isn't part of a metadata | |
8066 | * allocation cluster | |
8067 | */ | |
8068 | cluster = &root->fs_info->meta_alloc_cluster; | |
8069 | spin_lock(&cluster->refill_lock); | |
8070 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8071 | spin_unlock(&cluster->refill_lock); | |
8072 | ||
1a40e23b | 8073 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8074 | if (!path) { |
8075 | ret = -ENOMEM; | |
8076 | goto out; | |
8077 | } | |
1a40e23b | 8078 | |
10b2f34d | 8079 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8080 | if (!IS_ERR(inode)) { |
b532402e | 8081 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8082 | if (ret) { |
8083 | btrfs_add_delayed_iput(inode); | |
8084 | goto out; | |
8085 | } | |
0af3d00b JB |
8086 | clear_nlink(inode); |
8087 | /* One for the block groups ref */ | |
8088 | spin_lock(&block_group->lock); | |
8089 | if (block_group->iref) { | |
8090 | block_group->iref = 0; | |
8091 | block_group->inode = NULL; | |
8092 | spin_unlock(&block_group->lock); | |
8093 | iput(inode); | |
8094 | } else { | |
8095 | spin_unlock(&block_group->lock); | |
8096 | } | |
8097 | /* One for our lookup ref */ | |
455757c3 | 8098 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8099 | } |
8100 | ||
8101 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8102 | key.offset = block_group->key.objectid; | |
8103 | key.type = 0; | |
8104 | ||
8105 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8106 | if (ret < 0) | |
8107 | goto out; | |
8108 | if (ret > 0) | |
b3b4aa74 | 8109 | btrfs_release_path(path); |
0af3d00b JB |
8110 | if (ret == 0) { |
8111 | ret = btrfs_del_item(trans, tree_root, path); | |
8112 | if (ret) | |
8113 | goto out; | |
b3b4aa74 | 8114 | btrfs_release_path(path); |
0af3d00b JB |
8115 | } |
8116 | ||
3dfdb934 | 8117 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8118 | rb_erase(&block_group->cache_node, |
8119 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8120 | |
8121 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8122 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8123 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8124 | |
80eb234a | 8125 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8126 | /* |
8127 | * we must use list_del_init so people can check to see if they | |
8128 | * are still on the list after taking the semaphore | |
8129 | */ | |
8130 | list_del_init(&block_group->list); | |
10ea00f5 ID |
8131 | if (list_empty(&block_group->space_info->block_groups[index])) |
8132 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
80eb234a | 8133 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8134 | |
817d52f8 | 8135 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8136 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8137 | |
8138 | btrfs_remove_free_space_cache(block_group); | |
8139 | ||
c146afad YZ |
8140 | spin_lock(&block_group->space_info->lock); |
8141 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8142 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8143 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8144 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8145 | |
0af3d00b JB |
8146 | memcpy(&key, &block_group->key, sizeof(key)); |
8147 | ||
283bb197 | 8148 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8149 | |
fa9c0d79 CM |
8150 | btrfs_put_block_group(block_group); |
8151 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8152 | |
8153 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8154 | if (ret > 0) | |
8155 | ret = -EIO; | |
8156 | if (ret < 0) | |
8157 | goto out; | |
8158 | ||
8159 | ret = btrfs_del_item(trans, root, path); | |
8160 | out: | |
8161 | btrfs_free_path(path); | |
8162 | return ret; | |
8163 | } | |
acce952b | 8164 | |
c59021f8 | 8165 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8166 | { | |
8167 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8168 | struct btrfs_super_block *disk_super; |
8169 | u64 features; | |
8170 | u64 flags; | |
8171 | int mixed = 0; | |
c59021f8 | 8172 | int ret; |
8173 | ||
6c41761f | 8174 | disk_super = fs_info->super_copy; |
1aba86d6 | 8175 | if (!btrfs_super_root(disk_super)) |
8176 | return 1; | |
c59021f8 | 8177 | |
1aba86d6 | 8178 | features = btrfs_super_incompat_flags(disk_super); |
8179 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8180 | mixed = 1; | |
c59021f8 | 8181 | |
1aba86d6 | 8182 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8183 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8184 | if (ret) |
1aba86d6 | 8185 | goto out; |
c59021f8 | 8186 | |
1aba86d6 | 8187 | if (mixed) { |
8188 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8189 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8190 | } else { | |
8191 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8192 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8193 | if (ret) | |
8194 | goto out; | |
8195 | ||
8196 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8197 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8198 | } | |
8199 | out: | |
c59021f8 | 8200 | return ret; |
8201 | } | |
8202 | ||
acce952b | 8203 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8204 | { | |
8205 | return unpin_extent_range(root, start, end); | |
8206 | } | |
8207 | ||
8208 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8209 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8210 | { |
5378e607 | 8211 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8212 | } |
f7039b1d LD |
8213 | |
8214 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8215 | { | |
8216 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8217 | struct btrfs_block_group_cache *cache = NULL; | |
8218 | u64 group_trimmed; | |
8219 | u64 start; | |
8220 | u64 end; | |
8221 | u64 trimmed = 0; | |
2cac13e4 | 8222 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8223 | int ret = 0; |
8224 | ||
2cac13e4 LB |
8225 | /* |
8226 | * try to trim all FS space, our block group may start from non-zero. | |
8227 | */ | |
8228 | if (range->len == total_bytes) | |
8229 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8230 | else | |
8231 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8232 | |
8233 | while (cache) { | |
8234 | if (cache->key.objectid >= (range->start + range->len)) { | |
8235 | btrfs_put_block_group(cache); | |
8236 | break; | |
8237 | } | |
8238 | ||
8239 | start = max(range->start, cache->key.objectid); | |
8240 | end = min(range->start + range->len, | |
8241 | cache->key.objectid + cache->key.offset); | |
8242 | ||
8243 | if (end - start >= range->minlen) { | |
8244 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8245 | ret = cache_block_group(cache, 0); |
f7039b1d LD |
8246 | if (!ret) |
8247 | wait_block_group_cache_done(cache); | |
8248 | } | |
8249 | ret = btrfs_trim_block_group(cache, | |
8250 | &group_trimmed, | |
8251 | start, | |
8252 | end, | |
8253 | range->minlen); | |
8254 | ||
8255 | trimmed += group_trimmed; | |
8256 | if (ret) { | |
8257 | btrfs_put_block_group(cache); | |
8258 | break; | |
8259 | } | |
8260 | } | |
8261 | ||
8262 | cache = next_block_group(fs_info->tree_root, cache); | |
8263 | } | |
8264 | ||
8265 | range->len = trimmed; | |
8266 | return ret; | |
8267 | } |