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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> |
4b4e25f2 | 26 | #include "compat.h" |
74493f7a | 27 | #include "hash.h" |
fec577fb CM |
28 | #include "ctree.h" |
29 | #include "disk-io.h" | |
30 | #include "print-tree.h" | |
e089f05c | 31 | #include "transaction.h" |
0b86a832 | 32 | #include "volumes.h" |
925baedd | 33 | #include "locking.h" |
fa9c0d79 | 34 | #include "free-space-cache.h" |
fec577fb | 35 | |
0e4f8f88 CM |
36 | /* control flags for do_chunk_alloc's force field |
37 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk | |
38 | * if we really need one. | |
39 | * | |
40 | * CHUNK_ALLOC_FORCE means it must try to allocate one | |
41 | * | |
42 | * CHUNK_ALLOC_LIMITED means to only try and allocate one | |
43 | * if we have very few chunks already allocated. This is | |
44 | * used as part of the clustering code to help make sure | |
45 | * we have a good pool of storage to cluster in, without | |
46 | * filling the FS with empty chunks | |
47 | * | |
48 | */ | |
49 | enum { | |
50 | CHUNK_ALLOC_NO_FORCE = 0, | |
51 | CHUNK_ALLOC_FORCE = 1, | |
52 | CHUNK_ALLOC_LIMITED = 2, | |
53 | }; | |
54 | ||
fb25e914 JB |
55 | /* |
56 | * Control how reservations are dealt with. | |
57 | * | |
58 | * RESERVE_FREE - freeing a reservation. | |
59 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
60 | * ENOSPC accounting | |
61 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
62 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
63 | */ | |
64 | enum { | |
65 | RESERVE_FREE = 0, | |
66 | RESERVE_ALLOC = 1, | |
67 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
68 | }; | |
69 | ||
f3465ca4 JB |
70 | static int update_block_group(struct btrfs_trans_handle *trans, |
71 | struct btrfs_root *root, | |
f0486c68 | 72 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
73 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
74 | struct btrfs_root *root, | |
75 | u64 bytenr, u64 num_bytes, u64 parent, | |
76 | u64 root_objectid, u64 owner_objectid, | |
77 | u64 owner_offset, int refs_to_drop, | |
78 | struct btrfs_delayed_extent_op *extra_op); | |
79 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
80 | struct extent_buffer *leaf, | |
81 | struct btrfs_extent_item *ei); | |
82 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
83 | struct btrfs_root *root, | |
84 | u64 parent, u64 root_objectid, | |
85 | u64 flags, u64 owner, u64 offset, | |
86 | struct btrfs_key *ins, int ref_mod); | |
87 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
88 | struct btrfs_root *root, | |
89 | u64 parent, u64 root_objectid, | |
90 | u64 flags, struct btrfs_disk_key *key, | |
91 | int level, struct btrfs_key *ins); | |
6a63209f JB |
92 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
93 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
94 | u64 flags, int force); | |
11833d66 YZ |
95 | static int find_next_key(struct btrfs_path *path, int level, |
96 | struct btrfs_key *key); | |
9ed74f2d JB |
97 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
98 | int dump_block_groups); | |
fb25e914 JB |
99 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
100 | u64 num_bytes, int reserve); | |
6a63209f | 101 | |
817d52f8 JB |
102 | static noinline int |
103 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
104 | { | |
105 | smp_mb(); | |
106 | return cache->cached == BTRFS_CACHE_FINISHED; | |
107 | } | |
108 | ||
0f9dd46c JB |
109 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
110 | { | |
111 | return (cache->flags & bits) == bits; | |
112 | } | |
113 | ||
62a45b60 | 114 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
115 | { |
116 | atomic_inc(&cache->count); | |
117 | } | |
118 | ||
119 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
120 | { | |
f0486c68 YZ |
121 | if (atomic_dec_and_test(&cache->count)) { |
122 | WARN_ON(cache->pinned > 0); | |
123 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 124 | kfree(cache->free_space_ctl); |
11dfe35a | 125 | kfree(cache); |
f0486c68 | 126 | } |
11dfe35a JB |
127 | } |
128 | ||
0f9dd46c JB |
129 | /* |
130 | * this adds the block group to the fs_info rb tree for the block group | |
131 | * cache | |
132 | */ | |
b2950863 | 133 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
134 | struct btrfs_block_group_cache *block_group) |
135 | { | |
136 | struct rb_node **p; | |
137 | struct rb_node *parent = NULL; | |
138 | struct btrfs_block_group_cache *cache; | |
139 | ||
140 | spin_lock(&info->block_group_cache_lock); | |
141 | p = &info->block_group_cache_tree.rb_node; | |
142 | ||
143 | while (*p) { | |
144 | parent = *p; | |
145 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
146 | cache_node); | |
147 | if (block_group->key.objectid < cache->key.objectid) { | |
148 | p = &(*p)->rb_left; | |
149 | } else if (block_group->key.objectid > cache->key.objectid) { | |
150 | p = &(*p)->rb_right; | |
151 | } else { | |
152 | spin_unlock(&info->block_group_cache_lock); | |
153 | return -EEXIST; | |
154 | } | |
155 | } | |
156 | ||
157 | rb_link_node(&block_group->cache_node, parent, p); | |
158 | rb_insert_color(&block_group->cache_node, | |
159 | &info->block_group_cache_tree); | |
160 | spin_unlock(&info->block_group_cache_lock); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | /* | |
166 | * This will return the block group at or after bytenr if contains is 0, else | |
167 | * it will return the block group that contains the bytenr | |
168 | */ | |
169 | static struct btrfs_block_group_cache * | |
170 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
171 | int contains) | |
172 | { | |
173 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
174 | struct rb_node *n; | |
175 | u64 end, start; | |
176 | ||
177 | spin_lock(&info->block_group_cache_lock); | |
178 | n = info->block_group_cache_tree.rb_node; | |
179 | ||
180 | while (n) { | |
181 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
182 | cache_node); | |
183 | end = cache->key.objectid + cache->key.offset - 1; | |
184 | start = cache->key.objectid; | |
185 | ||
186 | if (bytenr < start) { | |
187 | if (!contains && (!ret || start < ret->key.objectid)) | |
188 | ret = cache; | |
189 | n = n->rb_left; | |
190 | } else if (bytenr > start) { | |
191 | if (contains && bytenr <= end) { | |
192 | ret = cache; | |
193 | break; | |
194 | } | |
195 | n = n->rb_right; | |
196 | } else { | |
197 | ret = cache; | |
198 | break; | |
199 | } | |
200 | } | |
d2fb3437 | 201 | if (ret) |
11dfe35a | 202 | btrfs_get_block_group(ret); |
0f9dd46c JB |
203 | spin_unlock(&info->block_group_cache_lock); |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
11833d66 YZ |
208 | static int add_excluded_extent(struct btrfs_root *root, |
209 | u64 start, u64 num_bytes) | |
817d52f8 | 210 | { |
11833d66 YZ |
211 | u64 end = start + num_bytes - 1; |
212 | set_extent_bits(&root->fs_info->freed_extents[0], | |
213 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
214 | set_extent_bits(&root->fs_info->freed_extents[1], | |
215 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
216 | return 0; | |
217 | } | |
817d52f8 | 218 | |
11833d66 YZ |
219 | static void free_excluded_extents(struct btrfs_root *root, |
220 | struct btrfs_block_group_cache *cache) | |
221 | { | |
222 | u64 start, end; | |
817d52f8 | 223 | |
11833d66 YZ |
224 | start = cache->key.objectid; |
225 | end = start + cache->key.offset - 1; | |
226 | ||
227 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
228 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
229 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
230 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
231 | } |
232 | ||
11833d66 YZ |
233 | static int exclude_super_stripes(struct btrfs_root *root, |
234 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 235 | { |
817d52f8 JB |
236 | u64 bytenr; |
237 | u64 *logical; | |
238 | int stripe_len; | |
239 | int i, nr, ret; | |
240 | ||
06b2331f YZ |
241 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
242 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
243 | cache->bytes_super += stripe_len; | |
244 | ret = add_excluded_extent(root, cache->key.objectid, | |
245 | stripe_len); | |
246 | BUG_ON(ret); | |
247 | } | |
248 | ||
817d52f8 JB |
249 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
250 | bytenr = btrfs_sb_offset(i); | |
251 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
252 | cache->key.objectid, bytenr, | |
253 | 0, &logical, &nr, &stripe_len); | |
254 | BUG_ON(ret); | |
11833d66 | 255 | |
817d52f8 | 256 | while (nr--) { |
1b2da372 | 257 | cache->bytes_super += stripe_len; |
11833d66 YZ |
258 | ret = add_excluded_extent(root, logical[nr], |
259 | stripe_len); | |
260 | BUG_ON(ret); | |
817d52f8 | 261 | } |
11833d66 | 262 | |
817d52f8 JB |
263 | kfree(logical); |
264 | } | |
817d52f8 JB |
265 | return 0; |
266 | } | |
267 | ||
11833d66 YZ |
268 | static struct btrfs_caching_control * |
269 | get_caching_control(struct btrfs_block_group_cache *cache) | |
270 | { | |
271 | struct btrfs_caching_control *ctl; | |
272 | ||
273 | spin_lock(&cache->lock); | |
274 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
275 | spin_unlock(&cache->lock); | |
276 | return NULL; | |
277 | } | |
278 | ||
dde5abee JB |
279 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
280 | if (!cache->caching_ctl) { | |
281 | spin_unlock(&cache->lock); | |
11833d66 YZ |
282 | return NULL; |
283 | } | |
284 | ||
285 | ctl = cache->caching_ctl; | |
286 | atomic_inc(&ctl->count); | |
287 | spin_unlock(&cache->lock); | |
288 | return ctl; | |
289 | } | |
290 | ||
291 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
292 | { | |
293 | if (atomic_dec_and_test(&ctl->count)) | |
294 | kfree(ctl); | |
295 | } | |
296 | ||
0f9dd46c JB |
297 | /* |
298 | * this is only called by cache_block_group, since we could have freed extents | |
299 | * we need to check the pinned_extents for any extents that can't be used yet | |
300 | * since their free space will be released as soon as the transaction commits. | |
301 | */ | |
817d52f8 | 302 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
303 | struct btrfs_fs_info *info, u64 start, u64 end) |
304 | { | |
817d52f8 | 305 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
306 | int ret; |
307 | ||
308 | while (start < end) { | |
11833d66 | 309 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 310 | &extent_start, &extent_end, |
11833d66 | 311 | EXTENT_DIRTY | EXTENT_UPTODATE); |
0f9dd46c JB |
312 | if (ret) |
313 | break; | |
314 | ||
06b2331f | 315 | if (extent_start <= start) { |
0f9dd46c JB |
316 | start = extent_end + 1; |
317 | } else if (extent_start > start && extent_start < end) { | |
318 | size = extent_start - start; | |
817d52f8 | 319 | total_added += size; |
ea6a478e JB |
320 | ret = btrfs_add_free_space(block_group, start, |
321 | size); | |
0f9dd46c JB |
322 | BUG_ON(ret); |
323 | start = extent_end + 1; | |
324 | } else { | |
325 | break; | |
326 | } | |
327 | } | |
328 | ||
329 | if (start < end) { | |
330 | size = end - start; | |
817d52f8 | 331 | total_added += size; |
ea6a478e | 332 | ret = btrfs_add_free_space(block_group, start, size); |
0f9dd46c JB |
333 | BUG_ON(ret); |
334 | } | |
335 | ||
817d52f8 | 336 | return total_added; |
0f9dd46c JB |
337 | } |
338 | ||
bab39bf9 | 339 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 340 | { |
bab39bf9 JB |
341 | struct btrfs_block_group_cache *block_group; |
342 | struct btrfs_fs_info *fs_info; | |
343 | struct btrfs_caching_control *caching_ctl; | |
344 | struct btrfs_root *extent_root; | |
e37c9e69 | 345 | struct btrfs_path *path; |
5f39d397 | 346 | struct extent_buffer *leaf; |
11833d66 | 347 | struct btrfs_key key; |
817d52f8 | 348 | u64 total_found = 0; |
11833d66 YZ |
349 | u64 last = 0; |
350 | u32 nritems; | |
351 | int ret = 0; | |
f510cfec | 352 | |
bab39bf9 JB |
353 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
354 | block_group = caching_ctl->block_group; | |
355 | fs_info = block_group->fs_info; | |
356 | extent_root = fs_info->extent_root; | |
357 | ||
e37c9e69 CM |
358 | path = btrfs_alloc_path(); |
359 | if (!path) | |
bab39bf9 | 360 | goto out; |
7d7d6068 | 361 | |
817d52f8 | 362 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 363 | |
5cd57b2c | 364 | /* |
817d52f8 JB |
365 | * We don't want to deadlock with somebody trying to allocate a new |
366 | * extent for the extent root while also trying to search the extent | |
367 | * root to add free space. So we skip locking and search the commit | |
368 | * root, since its read-only | |
5cd57b2c CM |
369 | */ |
370 | path->skip_locking = 1; | |
817d52f8 | 371 | path->search_commit_root = 1; |
026fd317 | 372 | path->reada = 1; |
817d52f8 | 373 | |
e4404d6e | 374 | key.objectid = last; |
e37c9e69 | 375 | key.offset = 0; |
11833d66 | 376 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 377 | again: |
11833d66 | 378 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
379 | /* need to make sure the commit_root doesn't disappear */ |
380 | down_read(&fs_info->extent_commit_sem); | |
381 | ||
11833d66 | 382 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 383 | if (ret < 0) |
ef8bbdfe | 384 | goto err; |
a512bbf8 | 385 | |
11833d66 YZ |
386 | leaf = path->nodes[0]; |
387 | nritems = btrfs_header_nritems(leaf); | |
388 | ||
d397712b | 389 | while (1) { |
7841cb28 | 390 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 391 | last = (u64)-1; |
817d52f8 | 392 | break; |
f25784b3 | 393 | } |
817d52f8 | 394 | |
11833d66 YZ |
395 | if (path->slots[0] < nritems) { |
396 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
397 | } else { | |
398 | ret = find_next_key(path, 0, &key); | |
399 | if (ret) | |
e37c9e69 | 400 | break; |
817d52f8 | 401 | |
589d8ade JB |
402 | if (need_resched() || |
403 | btrfs_next_leaf(extent_root, path)) { | |
404 | caching_ctl->progress = last; | |
ff5714cc | 405 | btrfs_release_path(path); |
589d8ade JB |
406 | up_read(&fs_info->extent_commit_sem); |
407 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 408 | cond_resched(); |
589d8ade JB |
409 | goto again; |
410 | } | |
411 | leaf = path->nodes[0]; | |
412 | nritems = btrfs_header_nritems(leaf); | |
413 | continue; | |
11833d66 | 414 | } |
817d52f8 | 415 | |
11833d66 YZ |
416 | if (key.objectid < block_group->key.objectid) { |
417 | path->slots[0]++; | |
817d52f8 | 418 | continue; |
e37c9e69 | 419 | } |
0f9dd46c | 420 | |
e37c9e69 | 421 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 422 | block_group->key.offset) |
e37c9e69 | 423 | break; |
7d7d6068 | 424 | |
11833d66 | 425 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
426 | total_found += add_new_free_space(block_group, |
427 | fs_info, last, | |
428 | key.objectid); | |
7d7d6068 | 429 | last = key.objectid + key.offset; |
817d52f8 | 430 | |
11833d66 YZ |
431 | if (total_found > (1024 * 1024 * 2)) { |
432 | total_found = 0; | |
433 | wake_up(&caching_ctl->wait); | |
434 | } | |
817d52f8 | 435 | } |
e37c9e69 CM |
436 | path->slots[0]++; |
437 | } | |
817d52f8 | 438 | ret = 0; |
e37c9e69 | 439 | |
817d52f8 JB |
440 | total_found += add_new_free_space(block_group, fs_info, last, |
441 | block_group->key.objectid + | |
442 | block_group->key.offset); | |
11833d66 | 443 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
444 | |
445 | spin_lock(&block_group->lock); | |
11833d66 | 446 | block_group->caching_ctl = NULL; |
817d52f8 JB |
447 | block_group->cached = BTRFS_CACHE_FINISHED; |
448 | spin_unlock(&block_group->lock); | |
0f9dd46c | 449 | |
54aa1f4d | 450 | err: |
e37c9e69 | 451 | btrfs_free_path(path); |
276e680d | 452 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 453 | |
11833d66 YZ |
454 | free_excluded_extents(extent_root, block_group); |
455 | ||
456 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 457 | out: |
11833d66 YZ |
458 | wake_up(&caching_ctl->wait); |
459 | ||
460 | put_caching_control(caching_ctl); | |
11dfe35a | 461 | btrfs_put_block_group(block_group); |
817d52f8 JB |
462 | } |
463 | ||
9d66e233 JB |
464 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
465 | struct btrfs_trans_handle *trans, | |
b8399dee | 466 | struct btrfs_root *root, |
9d66e233 | 467 | int load_cache_only) |
817d52f8 | 468 | { |
11833d66 YZ |
469 | struct btrfs_fs_info *fs_info = cache->fs_info; |
470 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
471 | int ret = 0; |
472 | ||
11833d66 YZ |
473 | smp_mb(); |
474 | if (cache->cached != BTRFS_CACHE_NO) | |
475 | return 0; | |
476 | ||
9d66e233 JB |
477 | /* |
478 | * We can't do the read from on-disk cache during a commit since we need | |
b8399dee JB |
479 | * to have the normal tree locking. Also if we are currently trying to |
480 | * allocate blocks for the tree root we can't do the fast caching since | |
481 | * we likely hold important locks. | |
9d66e233 | 482 | */ |
f7039b1d | 483 | if (trans && (!trans->transaction->in_commit) && |
73bc1876 JB |
484 | (root && root != root->fs_info->tree_root) && |
485 | btrfs_test_opt(root, SPACE_CACHE)) { | |
9d66e233 JB |
486 | spin_lock(&cache->lock); |
487 | if (cache->cached != BTRFS_CACHE_NO) { | |
488 | spin_unlock(&cache->lock); | |
489 | return 0; | |
490 | } | |
491 | cache->cached = BTRFS_CACHE_STARTED; | |
492 | spin_unlock(&cache->lock); | |
493 | ||
494 | ret = load_free_space_cache(fs_info, cache); | |
495 | ||
496 | spin_lock(&cache->lock); | |
497 | if (ret == 1) { | |
498 | cache->cached = BTRFS_CACHE_FINISHED; | |
499 | cache->last_byte_to_unpin = (u64)-1; | |
500 | } else { | |
501 | cache->cached = BTRFS_CACHE_NO; | |
502 | } | |
503 | spin_unlock(&cache->lock); | |
3c14874a JB |
504 | if (ret == 1) { |
505 | free_excluded_extents(fs_info->extent_root, cache); | |
9d66e233 | 506 | return 0; |
3c14874a | 507 | } |
9d66e233 JB |
508 | } |
509 | ||
510 | if (load_cache_only) | |
511 | return 0; | |
512 | ||
fc0e4a31 | 513 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
11833d66 YZ |
514 | BUG_ON(!caching_ctl); |
515 | ||
516 | INIT_LIST_HEAD(&caching_ctl->list); | |
517 | mutex_init(&caching_ctl->mutex); | |
518 | init_waitqueue_head(&caching_ctl->wait); | |
519 | caching_ctl->block_group = cache; | |
520 | caching_ctl->progress = cache->key.objectid; | |
521 | /* one for caching kthread, one for caching block group list */ | |
522 | atomic_set(&caching_ctl->count, 2); | |
bab39bf9 | 523 | caching_ctl->work.func = caching_thread; |
11833d66 | 524 | |
817d52f8 JB |
525 | spin_lock(&cache->lock); |
526 | if (cache->cached != BTRFS_CACHE_NO) { | |
527 | spin_unlock(&cache->lock); | |
11833d66 YZ |
528 | kfree(caching_ctl); |
529 | return 0; | |
817d52f8 | 530 | } |
11833d66 | 531 | cache->caching_ctl = caching_ctl; |
817d52f8 JB |
532 | cache->cached = BTRFS_CACHE_STARTED; |
533 | spin_unlock(&cache->lock); | |
534 | ||
11833d66 YZ |
535 | down_write(&fs_info->extent_commit_sem); |
536 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
537 | up_write(&fs_info->extent_commit_sem); | |
538 | ||
11dfe35a | 539 | btrfs_get_block_group(cache); |
11833d66 | 540 | |
bab39bf9 | 541 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 542 | |
ef8bbdfe | 543 | return ret; |
e37c9e69 CM |
544 | } |
545 | ||
0f9dd46c JB |
546 | /* |
547 | * return the block group that starts at or after bytenr | |
548 | */ | |
d397712b CM |
549 | static struct btrfs_block_group_cache * |
550 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 551 | { |
0f9dd46c | 552 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 553 | |
0f9dd46c | 554 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 555 | |
0f9dd46c | 556 | return cache; |
0ef3e66b CM |
557 | } |
558 | ||
0f9dd46c | 559 | /* |
9f55684c | 560 | * return the block group that contains the given bytenr |
0f9dd46c | 561 | */ |
d397712b CM |
562 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
563 | struct btrfs_fs_info *info, | |
564 | u64 bytenr) | |
be744175 | 565 | { |
0f9dd46c | 566 | struct btrfs_block_group_cache *cache; |
be744175 | 567 | |
0f9dd46c | 568 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 569 | |
0f9dd46c | 570 | return cache; |
be744175 | 571 | } |
0b86a832 | 572 | |
0f9dd46c JB |
573 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
574 | u64 flags) | |
6324fbf3 | 575 | { |
0f9dd46c | 576 | struct list_head *head = &info->space_info; |
0f9dd46c | 577 | struct btrfs_space_info *found; |
4184ea7f | 578 | |
b742bb82 YZ |
579 | flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM | |
580 | BTRFS_BLOCK_GROUP_METADATA; | |
581 | ||
4184ea7f CM |
582 | rcu_read_lock(); |
583 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 584 | if (found->flags & flags) { |
4184ea7f | 585 | rcu_read_unlock(); |
0f9dd46c | 586 | return found; |
4184ea7f | 587 | } |
0f9dd46c | 588 | } |
4184ea7f | 589 | rcu_read_unlock(); |
0f9dd46c | 590 | return NULL; |
6324fbf3 CM |
591 | } |
592 | ||
4184ea7f CM |
593 | /* |
594 | * after adding space to the filesystem, we need to clear the full flags | |
595 | * on all the space infos. | |
596 | */ | |
597 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
598 | { | |
599 | struct list_head *head = &info->space_info; | |
600 | struct btrfs_space_info *found; | |
601 | ||
602 | rcu_read_lock(); | |
603 | list_for_each_entry_rcu(found, head, list) | |
604 | found->full = 0; | |
605 | rcu_read_unlock(); | |
606 | } | |
607 | ||
80eb234a JB |
608 | static u64 div_factor(u64 num, int factor) |
609 | { | |
610 | if (factor == 10) | |
611 | return num; | |
612 | num *= factor; | |
613 | do_div(num, 10); | |
614 | return num; | |
615 | } | |
616 | ||
e5bc2458 CM |
617 | static u64 div_factor_fine(u64 num, int factor) |
618 | { | |
619 | if (factor == 100) | |
620 | return num; | |
621 | num *= factor; | |
622 | do_div(num, 100); | |
623 | return num; | |
624 | } | |
625 | ||
d2fb3437 YZ |
626 | u64 btrfs_find_block_group(struct btrfs_root *root, |
627 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 628 | { |
96b5179d | 629 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 630 | u64 used; |
d2fb3437 YZ |
631 | u64 last = max(search_hint, search_start); |
632 | u64 group_start = 0; | |
31f3c99b | 633 | int full_search = 0; |
d2fb3437 | 634 | int factor = 9; |
0ef3e66b | 635 | int wrapped = 0; |
31f3c99b | 636 | again: |
e8569813 ZY |
637 | while (1) { |
638 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
639 | if (!cache) |
640 | break; | |
96b5179d | 641 | |
c286ac48 | 642 | spin_lock(&cache->lock); |
96b5179d CM |
643 | last = cache->key.objectid + cache->key.offset; |
644 | used = btrfs_block_group_used(&cache->item); | |
645 | ||
d2fb3437 YZ |
646 | if ((full_search || !cache->ro) && |
647 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 648 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
649 | div_factor(cache->key.offset, factor)) { |
650 | group_start = cache->key.objectid; | |
c286ac48 | 651 | spin_unlock(&cache->lock); |
fa9c0d79 | 652 | btrfs_put_block_group(cache); |
8790d502 CM |
653 | goto found; |
654 | } | |
6324fbf3 | 655 | } |
c286ac48 | 656 | spin_unlock(&cache->lock); |
fa9c0d79 | 657 | btrfs_put_block_group(cache); |
de428b63 | 658 | cond_resched(); |
cd1bc465 | 659 | } |
0ef3e66b CM |
660 | if (!wrapped) { |
661 | last = search_start; | |
662 | wrapped = 1; | |
663 | goto again; | |
664 | } | |
665 | if (!full_search && factor < 10) { | |
be744175 | 666 | last = search_start; |
31f3c99b | 667 | full_search = 1; |
0ef3e66b | 668 | factor = 10; |
31f3c99b CM |
669 | goto again; |
670 | } | |
be744175 | 671 | found: |
d2fb3437 | 672 | return group_start; |
925baedd | 673 | } |
0f9dd46c | 674 | |
e02119d5 | 675 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 676 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
677 | { |
678 | int ret; | |
679 | struct btrfs_key key; | |
31840ae1 | 680 | struct btrfs_path *path; |
e02119d5 | 681 | |
31840ae1 | 682 | path = btrfs_alloc_path(); |
d8926bb3 MF |
683 | if (!path) |
684 | return -ENOMEM; | |
685 | ||
e02119d5 CM |
686 | key.objectid = start; |
687 | key.offset = len; | |
688 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
689 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
690 | 0, 0); | |
31840ae1 | 691 | btrfs_free_path(path); |
7bb86316 CM |
692 | return ret; |
693 | } | |
694 | ||
a22285a6 YZ |
695 | /* |
696 | * helper function to lookup reference count and flags of extent. | |
697 | * | |
698 | * the head node for delayed ref is used to store the sum of all the | |
699 | * reference count modifications queued up in the rbtree. the head | |
700 | * node may also store the extent flags to set. This way you can check | |
701 | * to see what the reference count and extent flags would be if all of | |
702 | * the delayed refs are not processed. | |
703 | */ | |
704 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
705 | struct btrfs_root *root, u64 bytenr, | |
706 | u64 num_bytes, u64 *refs, u64 *flags) | |
707 | { | |
708 | struct btrfs_delayed_ref_head *head; | |
709 | struct btrfs_delayed_ref_root *delayed_refs; | |
710 | struct btrfs_path *path; | |
711 | struct btrfs_extent_item *ei; | |
712 | struct extent_buffer *leaf; | |
713 | struct btrfs_key key; | |
714 | u32 item_size; | |
715 | u64 num_refs; | |
716 | u64 extent_flags; | |
717 | int ret; | |
718 | ||
719 | path = btrfs_alloc_path(); | |
720 | if (!path) | |
721 | return -ENOMEM; | |
722 | ||
723 | key.objectid = bytenr; | |
724 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
725 | key.offset = num_bytes; | |
726 | if (!trans) { | |
727 | path->skip_locking = 1; | |
728 | path->search_commit_root = 1; | |
729 | } | |
730 | again: | |
731 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
732 | &key, path, 0, 0); | |
733 | if (ret < 0) | |
734 | goto out_free; | |
735 | ||
736 | if (ret == 0) { | |
737 | leaf = path->nodes[0]; | |
738 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
739 | if (item_size >= sizeof(*ei)) { | |
740 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
741 | struct btrfs_extent_item); | |
742 | num_refs = btrfs_extent_refs(leaf, ei); | |
743 | extent_flags = btrfs_extent_flags(leaf, ei); | |
744 | } else { | |
745 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
746 | struct btrfs_extent_item_v0 *ei0; | |
747 | BUG_ON(item_size != sizeof(*ei0)); | |
748 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
749 | struct btrfs_extent_item_v0); | |
750 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
751 | /* FIXME: this isn't correct for data */ | |
752 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
753 | #else | |
754 | BUG(); | |
755 | #endif | |
756 | } | |
757 | BUG_ON(num_refs == 0); | |
758 | } else { | |
759 | num_refs = 0; | |
760 | extent_flags = 0; | |
761 | ret = 0; | |
762 | } | |
763 | ||
764 | if (!trans) | |
765 | goto out; | |
766 | ||
767 | delayed_refs = &trans->transaction->delayed_refs; | |
768 | spin_lock(&delayed_refs->lock); | |
769 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
770 | if (head) { | |
771 | if (!mutex_trylock(&head->mutex)) { | |
772 | atomic_inc(&head->node.refs); | |
773 | spin_unlock(&delayed_refs->lock); | |
774 | ||
b3b4aa74 | 775 | btrfs_release_path(path); |
a22285a6 | 776 | |
8cc33e5c DS |
777 | /* |
778 | * Mutex was contended, block until it's released and try | |
779 | * again | |
780 | */ | |
a22285a6 YZ |
781 | mutex_lock(&head->mutex); |
782 | mutex_unlock(&head->mutex); | |
783 | btrfs_put_delayed_ref(&head->node); | |
784 | goto again; | |
785 | } | |
786 | if (head->extent_op && head->extent_op->update_flags) | |
787 | extent_flags |= head->extent_op->flags_to_set; | |
788 | else | |
789 | BUG_ON(num_refs == 0); | |
790 | ||
791 | num_refs += head->node.ref_mod; | |
792 | mutex_unlock(&head->mutex); | |
793 | } | |
794 | spin_unlock(&delayed_refs->lock); | |
795 | out: | |
796 | WARN_ON(num_refs == 0); | |
797 | if (refs) | |
798 | *refs = num_refs; | |
799 | if (flags) | |
800 | *flags = extent_flags; | |
801 | out_free: | |
802 | btrfs_free_path(path); | |
803 | return ret; | |
804 | } | |
805 | ||
d8d5f3e1 CM |
806 | /* |
807 | * Back reference rules. Back refs have three main goals: | |
808 | * | |
809 | * 1) differentiate between all holders of references to an extent so that | |
810 | * when a reference is dropped we can make sure it was a valid reference | |
811 | * before freeing the extent. | |
812 | * | |
813 | * 2) Provide enough information to quickly find the holders of an extent | |
814 | * if we notice a given block is corrupted or bad. | |
815 | * | |
816 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
817 | * maintenance. This is actually the same as #2, but with a slightly | |
818 | * different use case. | |
819 | * | |
5d4f98a2 YZ |
820 | * There are two kinds of back refs. The implicit back refs is optimized |
821 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
822 | * back refs of this kind provide information about the block's owner tree | |
823 | * and the pointer's key. These information allow us to find the block by | |
824 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
825 | * referenced by their owner trees. The location of tree block is recorded | |
826 | * in the back refs. Actually the full back refs is generic, and can be | |
827 | * used in all cases the implicit back refs is used. The major shortcoming | |
828 | * of the full back refs is its overhead. Every time a tree block gets | |
829 | * COWed, we have to update back refs entry for all pointers in it. | |
830 | * | |
831 | * For a newly allocated tree block, we use implicit back refs for | |
832 | * pointers in it. This means most tree related operations only involve | |
833 | * implicit back refs. For a tree block created in old transaction, the | |
834 | * only way to drop a reference to it is COW it. So we can detect the | |
835 | * event that tree block loses its owner tree's reference and do the | |
836 | * back refs conversion. | |
837 | * | |
838 | * When a tree block is COW'd through a tree, there are four cases: | |
839 | * | |
840 | * The reference count of the block is one and the tree is the block's | |
841 | * owner tree. Nothing to do in this case. | |
842 | * | |
843 | * The reference count of the block is one and the tree is not the | |
844 | * block's owner tree. In this case, full back refs is used for pointers | |
845 | * in the block. Remove these full back refs, add implicit back refs for | |
846 | * every pointers in the new block. | |
847 | * | |
848 | * The reference count of the block is greater than one and the tree is | |
849 | * the block's owner tree. In this case, implicit back refs is used for | |
850 | * pointers in the block. Add full back refs for every pointers in the | |
851 | * block, increase lower level extents' reference counts. The original | |
852 | * implicit back refs are entailed to the new block. | |
853 | * | |
854 | * The reference count of the block is greater than one and the tree is | |
855 | * not the block's owner tree. Add implicit back refs for every pointer in | |
856 | * the new block, increase lower level extents' reference count. | |
857 | * | |
858 | * Back Reference Key composing: | |
859 | * | |
860 | * The key objectid corresponds to the first byte in the extent, | |
861 | * The key type is used to differentiate between types of back refs. | |
862 | * There are different meanings of the key offset for different types | |
863 | * of back refs. | |
864 | * | |
d8d5f3e1 CM |
865 | * File extents can be referenced by: |
866 | * | |
867 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 868 | * - different files inside a single subvolume |
d8d5f3e1 CM |
869 | * - different offsets inside a file (bookend extents in file.c) |
870 | * | |
5d4f98a2 | 871 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
872 | * |
873 | * - Objectid of the subvolume root | |
d8d5f3e1 | 874 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
875 | * - original offset in the file |
876 | * - how many bookend extents | |
d8d5f3e1 | 877 | * |
5d4f98a2 YZ |
878 | * The key offset for the implicit back refs is hash of the first |
879 | * three fields. | |
d8d5f3e1 | 880 | * |
5d4f98a2 | 881 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 882 | * |
5d4f98a2 | 883 | * - number of pointers in the tree leaf |
d8d5f3e1 | 884 | * |
5d4f98a2 YZ |
885 | * The key offset for the implicit back refs is the first byte of |
886 | * the tree leaf | |
d8d5f3e1 | 887 | * |
5d4f98a2 YZ |
888 | * When a file extent is allocated, The implicit back refs is used. |
889 | * the fields are filled in: | |
d8d5f3e1 | 890 | * |
5d4f98a2 | 891 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 892 | * |
5d4f98a2 YZ |
893 | * When a file extent is removed file truncation, we find the |
894 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 895 | * |
5d4f98a2 | 896 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 897 | * |
5d4f98a2 | 898 | * Btree extents can be referenced by: |
d8d5f3e1 | 899 | * |
5d4f98a2 | 900 | * - Different subvolumes |
d8d5f3e1 | 901 | * |
5d4f98a2 YZ |
902 | * Both the implicit back refs and the full back refs for tree blocks |
903 | * only consist of key. The key offset for the implicit back refs is | |
904 | * objectid of block's owner tree. The key offset for the full back refs | |
905 | * is the first byte of parent block. | |
d8d5f3e1 | 906 | * |
5d4f98a2 YZ |
907 | * When implicit back refs is used, information about the lowest key and |
908 | * level of the tree block are required. These information are stored in | |
909 | * tree block info structure. | |
d8d5f3e1 | 910 | */ |
31840ae1 | 911 | |
5d4f98a2 YZ |
912 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
913 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
914 | struct btrfs_root *root, | |
915 | struct btrfs_path *path, | |
916 | u64 owner, u32 extra_size) | |
7bb86316 | 917 | { |
5d4f98a2 YZ |
918 | struct btrfs_extent_item *item; |
919 | struct btrfs_extent_item_v0 *ei0; | |
920 | struct btrfs_extent_ref_v0 *ref0; | |
921 | struct btrfs_tree_block_info *bi; | |
922 | struct extent_buffer *leaf; | |
7bb86316 | 923 | struct btrfs_key key; |
5d4f98a2 YZ |
924 | struct btrfs_key found_key; |
925 | u32 new_size = sizeof(*item); | |
926 | u64 refs; | |
927 | int ret; | |
928 | ||
929 | leaf = path->nodes[0]; | |
930 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
931 | ||
932 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
933 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
934 | struct btrfs_extent_item_v0); | |
935 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
936 | ||
937 | if (owner == (u64)-1) { | |
938 | while (1) { | |
939 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
940 | ret = btrfs_next_leaf(root, path); | |
941 | if (ret < 0) | |
942 | return ret; | |
943 | BUG_ON(ret > 0); | |
944 | leaf = path->nodes[0]; | |
945 | } | |
946 | btrfs_item_key_to_cpu(leaf, &found_key, | |
947 | path->slots[0]); | |
948 | BUG_ON(key.objectid != found_key.objectid); | |
949 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
950 | path->slots[0]++; | |
951 | continue; | |
952 | } | |
953 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
954 | struct btrfs_extent_ref_v0); | |
955 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
956 | break; | |
957 | } | |
958 | } | |
b3b4aa74 | 959 | btrfs_release_path(path); |
5d4f98a2 YZ |
960 | |
961 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
962 | new_size += sizeof(*bi); | |
963 | ||
964 | new_size -= sizeof(*ei0); | |
965 | ret = btrfs_search_slot(trans, root, &key, path, | |
966 | new_size + extra_size, 1); | |
967 | if (ret < 0) | |
968 | return ret; | |
969 | BUG_ON(ret); | |
970 | ||
971 | ret = btrfs_extend_item(trans, root, path, new_size); | |
5d4f98a2 YZ |
972 | |
973 | leaf = path->nodes[0]; | |
974 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
975 | btrfs_set_extent_refs(leaf, item, refs); | |
976 | /* FIXME: get real generation */ | |
977 | btrfs_set_extent_generation(leaf, item, 0); | |
978 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
979 | btrfs_set_extent_flags(leaf, item, | |
980 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
981 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
982 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
983 | /* FIXME: get first key of the block */ | |
984 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
985 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
986 | } else { | |
987 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
988 | } | |
989 | btrfs_mark_buffer_dirty(leaf); | |
990 | return 0; | |
991 | } | |
992 | #endif | |
993 | ||
994 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
995 | { | |
996 | u32 high_crc = ~(u32)0; | |
997 | u32 low_crc = ~(u32)0; | |
998 | __le64 lenum; | |
999 | ||
1000 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1001 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1002 | lenum = cpu_to_le64(owner); |
163e783e | 1003 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1004 | lenum = cpu_to_le64(offset); |
163e783e | 1005 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1006 | |
1007 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1008 | } | |
1009 | ||
1010 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1011 | struct btrfs_extent_data_ref *ref) | |
1012 | { | |
1013 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1014 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1015 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1016 | } | |
1017 | ||
1018 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1019 | struct btrfs_extent_data_ref *ref, | |
1020 | u64 root_objectid, u64 owner, u64 offset) | |
1021 | { | |
1022 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1023 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1024 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1025 | return 0; | |
1026 | return 1; | |
1027 | } | |
1028 | ||
1029 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1030 | struct btrfs_root *root, | |
1031 | struct btrfs_path *path, | |
1032 | u64 bytenr, u64 parent, | |
1033 | u64 root_objectid, | |
1034 | u64 owner, u64 offset) | |
1035 | { | |
1036 | struct btrfs_key key; | |
1037 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1038 | struct extent_buffer *leaf; |
5d4f98a2 | 1039 | u32 nritems; |
74493f7a | 1040 | int ret; |
5d4f98a2 YZ |
1041 | int recow; |
1042 | int err = -ENOENT; | |
74493f7a | 1043 | |
31840ae1 | 1044 | key.objectid = bytenr; |
5d4f98a2 YZ |
1045 | if (parent) { |
1046 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1047 | key.offset = parent; | |
1048 | } else { | |
1049 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1050 | key.offset = hash_extent_data_ref(root_objectid, | |
1051 | owner, offset); | |
1052 | } | |
1053 | again: | |
1054 | recow = 0; | |
1055 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1056 | if (ret < 0) { | |
1057 | err = ret; | |
1058 | goto fail; | |
1059 | } | |
31840ae1 | 1060 | |
5d4f98a2 YZ |
1061 | if (parent) { |
1062 | if (!ret) | |
1063 | return 0; | |
1064 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1065 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1066 | btrfs_release_path(path); |
5d4f98a2 YZ |
1067 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1068 | if (ret < 0) { | |
1069 | err = ret; | |
1070 | goto fail; | |
1071 | } | |
1072 | if (!ret) | |
1073 | return 0; | |
1074 | #endif | |
1075 | goto fail; | |
31840ae1 ZY |
1076 | } |
1077 | ||
1078 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1079 | nritems = btrfs_header_nritems(leaf); |
1080 | while (1) { | |
1081 | if (path->slots[0] >= nritems) { | |
1082 | ret = btrfs_next_leaf(root, path); | |
1083 | if (ret < 0) | |
1084 | err = ret; | |
1085 | if (ret) | |
1086 | goto fail; | |
1087 | ||
1088 | leaf = path->nodes[0]; | |
1089 | nritems = btrfs_header_nritems(leaf); | |
1090 | recow = 1; | |
1091 | } | |
1092 | ||
1093 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1094 | if (key.objectid != bytenr || | |
1095 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1096 | goto fail; | |
1097 | ||
1098 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1099 | struct btrfs_extent_data_ref); | |
1100 | ||
1101 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1102 | owner, offset)) { | |
1103 | if (recow) { | |
b3b4aa74 | 1104 | btrfs_release_path(path); |
5d4f98a2 YZ |
1105 | goto again; |
1106 | } | |
1107 | err = 0; | |
1108 | break; | |
1109 | } | |
1110 | path->slots[0]++; | |
31840ae1 | 1111 | } |
5d4f98a2 YZ |
1112 | fail: |
1113 | return err; | |
31840ae1 ZY |
1114 | } |
1115 | ||
5d4f98a2 YZ |
1116 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1117 | struct btrfs_root *root, | |
1118 | struct btrfs_path *path, | |
1119 | u64 bytenr, u64 parent, | |
1120 | u64 root_objectid, u64 owner, | |
1121 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1122 | { |
1123 | struct btrfs_key key; | |
1124 | struct extent_buffer *leaf; | |
5d4f98a2 | 1125 | u32 size; |
31840ae1 ZY |
1126 | u32 num_refs; |
1127 | int ret; | |
74493f7a | 1128 | |
74493f7a | 1129 | key.objectid = bytenr; |
5d4f98a2 YZ |
1130 | if (parent) { |
1131 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1132 | key.offset = parent; | |
1133 | size = sizeof(struct btrfs_shared_data_ref); | |
1134 | } else { | |
1135 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1136 | key.offset = hash_extent_data_ref(root_objectid, | |
1137 | owner, offset); | |
1138 | size = sizeof(struct btrfs_extent_data_ref); | |
1139 | } | |
74493f7a | 1140 | |
5d4f98a2 YZ |
1141 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1142 | if (ret && ret != -EEXIST) | |
1143 | goto fail; | |
1144 | ||
1145 | leaf = path->nodes[0]; | |
1146 | if (parent) { | |
1147 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1148 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1149 | struct btrfs_shared_data_ref); |
1150 | if (ret == 0) { | |
1151 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1152 | } else { | |
1153 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1154 | num_refs += refs_to_add; | |
1155 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1156 | } |
5d4f98a2 YZ |
1157 | } else { |
1158 | struct btrfs_extent_data_ref *ref; | |
1159 | while (ret == -EEXIST) { | |
1160 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1161 | struct btrfs_extent_data_ref); | |
1162 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1163 | owner, offset)) | |
1164 | break; | |
b3b4aa74 | 1165 | btrfs_release_path(path); |
5d4f98a2 YZ |
1166 | key.offset++; |
1167 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1168 | size); | |
1169 | if (ret && ret != -EEXIST) | |
1170 | goto fail; | |
31840ae1 | 1171 | |
5d4f98a2 YZ |
1172 | leaf = path->nodes[0]; |
1173 | } | |
1174 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1175 | struct btrfs_extent_data_ref); | |
1176 | if (ret == 0) { | |
1177 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1178 | root_objectid); | |
1179 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1180 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1181 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1182 | } else { | |
1183 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1184 | num_refs += refs_to_add; | |
1185 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1186 | } |
31840ae1 | 1187 | } |
5d4f98a2 YZ |
1188 | btrfs_mark_buffer_dirty(leaf); |
1189 | ret = 0; | |
1190 | fail: | |
b3b4aa74 | 1191 | btrfs_release_path(path); |
7bb86316 | 1192 | return ret; |
74493f7a CM |
1193 | } |
1194 | ||
5d4f98a2 YZ |
1195 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1196 | struct btrfs_root *root, | |
1197 | struct btrfs_path *path, | |
1198 | int refs_to_drop) | |
31840ae1 | 1199 | { |
5d4f98a2 YZ |
1200 | struct btrfs_key key; |
1201 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1202 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1203 | struct extent_buffer *leaf; |
5d4f98a2 | 1204 | u32 num_refs = 0; |
31840ae1 ZY |
1205 | int ret = 0; |
1206 | ||
1207 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1208 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1209 | ||
1210 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1211 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1212 | struct btrfs_extent_data_ref); | |
1213 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1214 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1215 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1216 | struct btrfs_shared_data_ref); | |
1217 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1218 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1219 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1220 | struct btrfs_extent_ref_v0 *ref0; | |
1221 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1222 | struct btrfs_extent_ref_v0); | |
1223 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1224 | #endif | |
1225 | } else { | |
1226 | BUG(); | |
1227 | } | |
1228 | ||
56bec294 CM |
1229 | BUG_ON(num_refs < refs_to_drop); |
1230 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1231 | |
31840ae1 ZY |
1232 | if (num_refs == 0) { |
1233 | ret = btrfs_del_item(trans, root, path); | |
1234 | } else { | |
5d4f98a2 YZ |
1235 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1236 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1237 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1238 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1239 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1240 | else { | |
1241 | struct btrfs_extent_ref_v0 *ref0; | |
1242 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1243 | struct btrfs_extent_ref_v0); | |
1244 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1245 | } | |
1246 | #endif | |
31840ae1 ZY |
1247 | btrfs_mark_buffer_dirty(leaf); |
1248 | } | |
31840ae1 ZY |
1249 | return ret; |
1250 | } | |
1251 | ||
5d4f98a2 YZ |
1252 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1253 | struct btrfs_path *path, | |
1254 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1255 | { |
5d4f98a2 YZ |
1256 | struct btrfs_key key; |
1257 | struct extent_buffer *leaf; | |
1258 | struct btrfs_extent_data_ref *ref1; | |
1259 | struct btrfs_shared_data_ref *ref2; | |
1260 | u32 num_refs = 0; | |
1261 | ||
1262 | leaf = path->nodes[0]; | |
1263 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1264 | if (iref) { | |
1265 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1266 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1267 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1268 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1269 | } else { | |
1270 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1271 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1272 | } | |
1273 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1274 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1275 | struct btrfs_extent_data_ref); | |
1276 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1277 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1278 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1279 | struct btrfs_shared_data_ref); | |
1280 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1281 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1282 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1283 | struct btrfs_extent_ref_v0 *ref0; | |
1284 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1285 | struct btrfs_extent_ref_v0); | |
1286 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1287 | #endif |
5d4f98a2 YZ |
1288 | } else { |
1289 | WARN_ON(1); | |
1290 | } | |
1291 | return num_refs; | |
1292 | } | |
15916de8 | 1293 | |
5d4f98a2 YZ |
1294 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1295 | struct btrfs_root *root, | |
1296 | struct btrfs_path *path, | |
1297 | u64 bytenr, u64 parent, | |
1298 | u64 root_objectid) | |
1f3c79a2 | 1299 | { |
5d4f98a2 | 1300 | struct btrfs_key key; |
1f3c79a2 | 1301 | int ret; |
1f3c79a2 | 1302 | |
5d4f98a2 YZ |
1303 | key.objectid = bytenr; |
1304 | if (parent) { | |
1305 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1306 | key.offset = parent; | |
1307 | } else { | |
1308 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1309 | key.offset = root_objectid; | |
1f3c79a2 LH |
1310 | } |
1311 | ||
5d4f98a2 YZ |
1312 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1313 | if (ret > 0) | |
1314 | ret = -ENOENT; | |
1315 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1316 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1317 | btrfs_release_path(path); |
5d4f98a2 YZ |
1318 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1319 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1320 | if (ret > 0) | |
1321 | ret = -ENOENT; | |
1322 | } | |
1f3c79a2 | 1323 | #endif |
5d4f98a2 | 1324 | return ret; |
1f3c79a2 LH |
1325 | } |
1326 | ||
5d4f98a2 YZ |
1327 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1328 | struct btrfs_root *root, | |
1329 | struct btrfs_path *path, | |
1330 | u64 bytenr, u64 parent, | |
1331 | u64 root_objectid) | |
31840ae1 | 1332 | { |
5d4f98a2 | 1333 | struct btrfs_key key; |
31840ae1 | 1334 | int ret; |
31840ae1 | 1335 | |
5d4f98a2 YZ |
1336 | key.objectid = bytenr; |
1337 | if (parent) { | |
1338 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1339 | key.offset = parent; | |
1340 | } else { | |
1341 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1342 | key.offset = root_objectid; | |
1343 | } | |
1344 | ||
1345 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1346 | btrfs_release_path(path); |
31840ae1 ZY |
1347 | return ret; |
1348 | } | |
1349 | ||
5d4f98a2 | 1350 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1351 | { |
5d4f98a2 YZ |
1352 | int type; |
1353 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1354 | if (parent > 0) | |
1355 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1356 | else | |
1357 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1358 | } else { | |
1359 | if (parent > 0) | |
1360 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1361 | else | |
1362 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1363 | } | |
1364 | return type; | |
31840ae1 | 1365 | } |
56bec294 | 1366 | |
2c47e605 YZ |
1367 | static int find_next_key(struct btrfs_path *path, int level, |
1368 | struct btrfs_key *key) | |
56bec294 | 1369 | |
02217ed2 | 1370 | { |
2c47e605 | 1371 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1372 | if (!path->nodes[level]) |
1373 | break; | |
5d4f98a2 YZ |
1374 | if (path->slots[level] + 1 >= |
1375 | btrfs_header_nritems(path->nodes[level])) | |
1376 | continue; | |
1377 | if (level == 0) | |
1378 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1379 | path->slots[level] + 1); | |
1380 | else | |
1381 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1382 | path->slots[level] + 1); | |
1383 | return 0; | |
1384 | } | |
1385 | return 1; | |
1386 | } | |
037e6390 | 1387 | |
5d4f98a2 YZ |
1388 | /* |
1389 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1390 | * to the address of inline back ref, and 0 is returned. | |
1391 | * | |
1392 | * if back ref isn't found, *ref_ret is set to the address where it | |
1393 | * should be inserted, and -ENOENT is returned. | |
1394 | * | |
1395 | * if insert is true and there are too many inline back refs, the path | |
1396 | * points to the extent item, and -EAGAIN is returned. | |
1397 | * | |
1398 | * NOTE: inline back refs are ordered in the same way that back ref | |
1399 | * items in the tree are ordered. | |
1400 | */ | |
1401 | static noinline_for_stack | |
1402 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1403 | struct btrfs_root *root, | |
1404 | struct btrfs_path *path, | |
1405 | struct btrfs_extent_inline_ref **ref_ret, | |
1406 | u64 bytenr, u64 num_bytes, | |
1407 | u64 parent, u64 root_objectid, | |
1408 | u64 owner, u64 offset, int insert) | |
1409 | { | |
1410 | struct btrfs_key key; | |
1411 | struct extent_buffer *leaf; | |
1412 | struct btrfs_extent_item *ei; | |
1413 | struct btrfs_extent_inline_ref *iref; | |
1414 | u64 flags; | |
1415 | u64 item_size; | |
1416 | unsigned long ptr; | |
1417 | unsigned long end; | |
1418 | int extra_size; | |
1419 | int type; | |
1420 | int want; | |
1421 | int ret; | |
1422 | int err = 0; | |
26b8003f | 1423 | |
db94535d | 1424 | key.objectid = bytenr; |
31840ae1 | 1425 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1426 | key.offset = num_bytes; |
31840ae1 | 1427 | |
5d4f98a2 YZ |
1428 | want = extent_ref_type(parent, owner); |
1429 | if (insert) { | |
1430 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1431 | path->keep_locks = 1; |
5d4f98a2 YZ |
1432 | } else |
1433 | extra_size = -1; | |
1434 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1435 | if (ret < 0) { |
5d4f98a2 YZ |
1436 | err = ret; |
1437 | goto out; | |
1438 | } | |
1439 | BUG_ON(ret); | |
1440 | ||
1441 | leaf = path->nodes[0]; | |
1442 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1443 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1444 | if (item_size < sizeof(*ei)) { | |
1445 | if (!insert) { | |
1446 | err = -ENOENT; | |
1447 | goto out; | |
1448 | } | |
1449 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1450 | extra_size); | |
1451 | if (ret < 0) { | |
1452 | err = ret; | |
1453 | goto out; | |
1454 | } | |
1455 | leaf = path->nodes[0]; | |
1456 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1457 | } | |
1458 | #endif | |
1459 | BUG_ON(item_size < sizeof(*ei)); | |
1460 | ||
5d4f98a2 YZ |
1461 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1462 | flags = btrfs_extent_flags(leaf, ei); | |
1463 | ||
1464 | ptr = (unsigned long)(ei + 1); | |
1465 | end = (unsigned long)ei + item_size; | |
1466 | ||
1467 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1468 | ptr += sizeof(struct btrfs_tree_block_info); | |
1469 | BUG_ON(ptr > end); | |
1470 | } else { | |
1471 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1472 | } | |
1473 | ||
1474 | err = -ENOENT; | |
1475 | while (1) { | |
1476 | if (ptr >= end) { | |
1477 | WARN_ON(ptr > end); | |
1478 | break; | |
1479 | } | |
1480 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1481 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1482 | if (want < type) | |
1483 | break; | |
1484 | if (want > type) { | |
1485 | ptr += btrfs_extent_inline_ref_size(type); | |
1486 | continue; | |
1487 | } | |
1488 | ||
1489 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1490 | struct btrfs_extent_data_ref *dref; | |
1491 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1492 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1493 | owner, offset)) { | |
1494 | err = 0; | |
1495 | break; | |
1496 | } | |
1497 | if (hash_extent_data_ref_item(leaf, dref) < | |
1498 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1499 | break; | |
1500 | } else { | |
1501 | u64 ref_offset; | |
1502 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1503 | if (parent > 0) { | |
1504 | if (parent == ref_offset) { | |
1505 | err = 0; | |
1506 | break; | |
1507 | } | |
1508 | if (ref_offset < parent) | |
1509 | break; | |
1510 | } else { | |
1511 | if (root_objectid == ref_offset) { | |
1512 | err = 0; | |
1513 | break; | |
1514 | } | |
1515 | if (ref_offset < root_objectid) | |
1516 | break; | |
1517 | } | |
1518 | } | |
1519 | ptr += btrfs_extent_inline_ref_size(type); | |
1520 | } | |
1521 | if (err == -ENOENT && insert) { | |
1522 | if (item_size + extra_size >= | |
1523 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1524 | err = -EAGAIN; | |
1525 | goto out; | |
1526 | } | |
1527 | /* | |
1528 | * To add new inline back ref, we have to make sure | |
1529 | * there is no corresponding back ref item. | |
1530 | * For simplicity, we just do not add new inline back | |
1531 | * ref if there is any kind of item for this block | |
1532 | */ | |
2c47e605 YZ |
1533 | if (find_next_key(path, 0, &key) == 0 && |
1534 | key.objectid == bytenr && | |
85d4198e | 1535 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1536 | err = -EAGAIN; |
1537 | goto out; | |
1538 | } | |
1539 | } | |
1540 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1541 | out: | |
85d4198e | 1542 | if (insert) { |
5d4f98a2 YZ |
1543 | path->keep_locks = 0; |
1544 | btrfs_unlock_up_safe(path, 1); | |
1545 | } | |
1546 | return err; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * helper to add new inline back ref | |
1551 | */ | |
1552 | static noinline_for_stack | |
1553 | int setup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1554 | struct btrfs_root *root, | |
1555 | struct btrfs_path *path, | |
1556 | struct btrfs_extent_inline_ref *iref, | |
1557 | u64 parent, u64 root_objectid, | |
1558 | u64 owner, u64 offset, int refs_to_add, | |
1559 | struct btrfs_delayed_extent_op *extent_op) | |
1560 | { | |
1561 | struct extent_buffer *leaf; | |
1562 | struct btrfs_extent_item *ei; | |
1563 | unsigned long ptr; | |
1564 | unsigned long end; | |
1565 | unsigned long item_offset; | |
1566 | u64 refs; | |
1567 | int size; | |
1568 | int type; | |
1569 | int ret; | |
1570 | ||
1571 | leaf = path->nodes[0]; | |
1572 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1573 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1574 | ||
1575 | type = extent_ref_type(parent, owner); | |
1576 | size = btrfs_extent_inline_ref_size(type); | |
1577 | ||
1578 | ret = btrfs_extend_item(trans, root, path, size); | |
5d4f98a2 YZ |
1579 | |
1580 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1581 | refs = btrfs_extent_refs(leaf, ei); | |
1582 | refs += refs_to_add; | |
1583 | btrfs_set_extent_refs(leaf, ei, refs); | |
1584 | if (extent_op) | |
1585 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1586 | ||
1587 | ptr = (unsigned long)ei + item_offset; | |
1588 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1589 | if (ptr < end - size) | |
1590 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1591 | end - size - ptr); | |
1592 | ||
1593 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1594 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1595 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1596 | struct btrfs_extent_data_ref *dref; | |
1597 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1598 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1599 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1600 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1601 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1602 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1603 | struct btrfs_shared_data_ref *sref; | |
1604 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1605 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1606 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1607 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1608 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1609 | } else { | |
1610 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1611 | } | |
1612 | btrfs_mark_buffer_dirty(leaf); | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1617 | struct btrfs_root *root, | |
1618 | struct btrfs_path *path, | |
1619 | struct btrfs_extent_inline_ref **ref_ret, | |
1620 | u64 bytenr, u64 num_bytes, u64 parent, | |
1621 | u64 root_objectid, u64 owner, u64 offset) | |
1622 | { | |
1623 | int ret; | |
1624 | ||
1625 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1626 | bytenr, num_bytes, parent, | |
1627 | root_objectid, owner, offset, 0); | |
1628 | if (ret != -ENOENT) | |
54aa1f4d | 1629 | return ret; |
5d4f98a2 | 1630 | |
b3b4aa74 | 1631 | btrfs_release_path(path); |
5d4f98a2 YZ |
1632 | *ref_ret = NULL; |
1633 | ||
1634 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1635 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1636 | root_objectid); | |
1637 | } else { | |
1638 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1639 | root_objectid, owner, offset); | |
b9473439 | 1640 | } |
5d4f98a2 YZ |
1641 | return ret; |
1642 | } | |
31840ae1 | 1643 | |
5d4f98a2 YZ |
1644 | /* |
1645 | * helper to update/remove inline back ref | |
1646 | */ | |
1647 | static noinline_for_stack | |
1648 | int update_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1649 | struct btrfs_root *root, | |
1650 | struct btrfs_path *path, | |
1651 | struct btrfs_extent_inline_ref *iref, | |
1652 | int refs_to_mod, | |
1653 | struct btrfs_delayed_extent_op *extent_op) | |
1654 | { | |
1655 | struct extent_buffer *leaf; | |
1656 | struct btrfs_extent_item *ei; | |
1657 | struct btrfs_extent_data_ref *dref = NULL; | |
1658 | struct btrfs_shared_data_ref *sref = NULL; | |
1659 | unsigned long ptr; | |
1660 | unsigned long end; | |
1661 | u32 item_size; | |
1662 | int size; | |
1663 | int type; | |
1664 | int ret; | |
1665 | u64 refs; | |
1666 | ||
1667 | leaf = path->nodes[0]; | |
1668 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1669 | refs = btrfs_extent_refs(leaf, ei); | |
1670 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1671 | refs += refs_to_mod; | |
1672 | btrfs_set_extent_refs(leaf, ei, refs); | |
1673 | if (extent_op) | |
1674 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1675 | ||
1676 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1677 | ||
1678 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1679 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1680 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1681 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1682 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1683 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1684 | } else { | |
1685 | refs = 1; | |
1686 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1687 | } |
31840ae1 | 1688 | |
5d4f98a2 YZ |
1689 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1690 | refs += refs_to_mod; | |
1691 | ||
1692 | if (refs > 0) { | |
1693 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1694 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1695 | else | |
1696 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1697 | } else { | |
1698 | size = btrfs_extent_inline_ref_size(type); | |
1699 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1700 | ptr = (unsigned long)iref; | |
1701 | end = (unsigned long)ei + item_size; | |
1702 | if (ptr + size < end) | |
1703 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1704 | end - ptr - size); | |
1705 | item_size -= size; | |
1706 | ret = btrfs_truncate_item(trans, root, path, item_size, 1); | |
5d4f98a2 YZ |
1707 | } |
1708 | btrfs_mark_buffer_dirty(leaf); | |
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | static noinline_for_stack | |
1713 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1714 | struct btrfs_root *root, | |
1715 | struct btrfs_path *path, | |
1716 | u64 bytenr, u64 num_bytes, u64 parent, | |
1717 | u64 root_objectid, u64 owner, | |
1718 | u64 offset, int refs_to_add, | |
1719 | struct btrfs_delayed_extent_op *extent_op) | |
1720 | { | |
1721 | struct btrfs_extent_inline_ref *iref; | |
1722 | int ret; | |
1723 | ||
1724 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1725 | bytenr, num_bytes, parent, | |
1726 | root_objectid, owner, offset, 1); | |
1727 | if (ret == 0) { | |
1728 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1729 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1730 | refs_to_add, extent_op); | |
1731 | } else if (ret == -ENOENT) { | |
1732 | ret = setup_inline_extent_backref(trans, root, path, iref, | |
1733 | parent, root_objectid, | |
1734 | owner, offset, refs_to_add, | |
1735 | extent_op); | |
771ed689 | 1736 | } |
5d4f98a2 YZ |
1737 | return ret; |
1738 | } | |
31840ae1 | 1739 | |
5d4f98a2 YZ |
1740 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1741 | struct btrfs_root *root, | |
1742 | struct btrfs_path *path, | |
1743 | u64 bytenr, u64 parent, u64 root_objectid, | |
1744 | u64 owner, u64 offset, int refs_to_add) | |
1745 | { | |
1746 | int ret; | |
1747 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1748 | BUG_ON(refs_to_add != 1); | |
1749 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1750 | parent, root_objectid); | |
1751 | } else { | |
1752 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1753 | parent, root_objectid, | |
1754 | owner, offset, refs_to_add); | |
1755 | } | |
1756 | return ret; | |
1757 | } | |
56bec294 | 1758 | |
5d4f98a2 YZ |
1759 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1760 | struct btrfs_root *root, | |
1761 | struct btrfs_path *path, | |
1762 | struct btrfs_extent_inline_ref *iref, | |
1763 | int refs_to_drop, int is_data) | |
1764 | { | |
1765 | int ret; | |
b9473439 | 1766 | |
5d4f98a2 YZ |
1767 | BUG_ON(!is_data && refs_to_drop != 1); |
1768 | if (iref) { | |
1769 | ret = update_inline_extent_backref(trans, root, path, iref, | |
1770 | -refs_to_drop, NULL); | |
1771 | } else if (is_data) { | |
1772 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1773 | } else { | |
1774 | ret = btrfs_del_item(trans, root, path); | |
1775 | } | |
1776 | return ret; | |
1777 | } | |
1778 | ||
5378e607 | 1779 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1780 | u64 start, u64 len) |
1781 | { | |
5378e607 | 1782 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1783 | } |
5d4f98a2 YZ |
1784 | |
1785 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1786 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1787 | { |
5d4f98a2 | 1788 | int ret; |
5378e607 | 1789 | u64 discarded_bytes = 0; |
5d4f98a2 YZ |
1790 | struct btrfs_multi_bio *multi = NULL; |
1791 | ||
e244a0ae | 1792 | |
5d4f98a2 | 1793 | /* Tell the block device(s) that the sectors can be discarded */ |
5378e607 LD |
1794 | ret = btrfs_map_block(&root->fs_info->mapping_tree, REQ_DISCARD, |
1795 | bytenr, &num_bytes, &multi, 0); | |
5d4f98a2 YZ |
1796 | if (!ret) { |
1797 | struct btrfs_bio_stripe *stripe = multi->stripes; | |
1798 | int i; | |
1799 | ||
5d4f98a2 YZ |
1800 | |
1801 | for (i = 0; i < multi->num_stripes; i++, stripe++) { | |
d5e2003c JB |
1802 | if (!stripe->dev->can_discard) |
1803 | continue; | |
1804 | ||
5378e607 LD |
1805 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1806 | stripe->physical, | |
1807 | stripe->length); | |
1808 | if (!ret) | |
1809 | discarded_bytes += stripe->length; | |
1810 | else if (ret != -EOPNOTSUPP) | |
1811 | break; | |
d5e2003c JB |
1812 | |
1813 | /* | |
1814 | * Just in case we get back EOPNOTSUPP for some reason, | |
1815 | * just ignore the return value so we don't screw up | |
1816 | * people calling discard_extent. | |
1817 | */ | |
1818 | ret = 0; | |
5d4f98a2 YZ |
1819 | } |
1820 | kfree(multi); | |
1821 | } | |
5378e607 LD |
1822 | |
1823 | if (actual_bytes) | |
1824 | *actual_bytes = discarded_bytes; | |
1825 | ||
5d4f98a2 YZ |
1826 | |
1827 | return ret; | |
5d4f98a2 YZ |
1828 | } |
1829 | ||
1830 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1831 | struct btrfs_root *root, | |
1832 | u64 bytenr, u64 num_bytes, u64 parent, | |
1833 | u64 root_objectid, u64 owner, u64 offset) | |
1834 | { | |
1835 | int ret; | |
1836 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1837 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1838 | ||
1839 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1840 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
1841 | parent, root_objectid, (int)owner, | |
1842 | BTRFS_ADD_DELAYED_REF, NULL); | |
1843 | } else { | |
1844 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
1845 | parent, root_objectid, owner, offset, | |
1846 | BTRFS_ADD_DELAYED_REF, NULL); | |
1847 | } | |
1848 | return ret; | |
1849 | } | |
1850 | ||
1851 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1852 | struct btrfs_root *root, | |
1853 | u64 bytenr, u64 num_bytes, | |
1854 | u64 parent, u64 root_objectid, | |
1855 | u64 owner, u64 offset, int refs_to_add, | |
1856 | struct btrfs_delayed_extent_op *extent_op) | |
1857 | { | |
1858 | struct btrfs_path *path; | |
1859 | struct extent_buffer *leaf; | |
1860 | struct btrfs_extent_item *item; | |
1861 | u64 refs; | |
1862 | int ret; | |
1863 | int err = 0; | |
1864 | ||
1865 | path = btrfs_alloc_path(); | |
1866 | if (!path) | |
1867 | return -ENOMEM; | |
1868 | ||
1869 | path->reada = 1; | |
1870 | path->leave_spinning = 1; | |
1871 | /* this will setup the path even if it fails to insert the back ref */ | |
1872 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1873 | path, bytenr, num_bytes, parent, | |
1874 | root_objectid, owner, offset, | |
1875 | refs_to_add, extent_op); | |
1876 | if (ret == 0) | |
1877 | goto out; | |
1878 | ||
1879 | if (ret != -EAGAIN) { | |
1880 | err = ret; | |
1881 | goto out; | |
1882 | } | |
1883 | ||
1884 | leaf = path->nodes[0]; | |
1885 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1886 | refs = btrfs_extent_refs(leaf, item); | |
1887 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1888 | if (extent_op) | |
1889 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1890 | |
5d4f98a2 | 1891 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1892 | btrfs_release_path(path); |
56bec294 CM |
1893 | |
1894 | path->reada = 1; | |
b9473439 CM |
1895 | path->leave_spinning = 1; |
1896 | ||
56bec294 CM |
1897 | /* now insert the actual backref */ |
1898 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1899 | path, bytenr, parent, root_objectid, |
1900 | owner, offset, refs_to_add); | |
56bec294 | 1901 | BUG_ON(ret); |
5d4f98a2 | 1902 | out: |
56bec294 | 1903 | btrfs_free_path(path); |
5d4f98a2 | 1904 | return err; |
56bec294 CM |
1905 | } |
1906 | ||
5d4f98a2 YZ |
1907 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1908 | struct btrfs_root *root, | |
1909 | struct btrfs_delayed_ref_node *node, | |
1910 | struct btrfs_delayed_extent_op *extent_op, | |
1911 | int insert_reserved) | |
56bec294 | 1912 | { |
5d4f98a2 YZ |
1913 | int ret = 0; |
1914 | struct btrfs_delayed_data_ref *ref; | |
1915 | struct btrfs_key ins; | |
1916 | u64 parent = 0; | |
1917 | u64 ref_root = 0; | |
1918 | u64 flags = 0; | |
1919 | ||
1920 | ins.objectid = node->bytenr; | |
1921 | ins.offset = node->num_bytes; | |
1922 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1923 | ||
1924 | ref = btrfs_delayed_node_to_data_ref(node); | |
1925 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1926 | parent = ref->parent; | |
1927 | else | |
1928 | ref_root = ref->root; | |
1929 | ||
1930 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1931 | if (extent_op) { | |
1932 | BUG_ON(extent_op->update_key); | |
1933 | flags |= extent_op->flags_to_set; | |
1934 | } | |
1935 | ret = alloc_reserved_file_extent(trans, root, | |
1936 | parent, ref_root, flags, | |
1937 | ref->objectid, ref->offset, | |
1938 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1939 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1940 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1941 | node->num_bytes, parent, | |
1942 | ref_root, ref->objectid, | |
1943 | ref->offset, node->ref_mod, | |
1944 | extent_op); | |
1945 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1946 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1947 | node->num_bytes, parent, | |
1948 | ref_root, ref->objectid, | |
1949 | ref->offset, node->ref_mod, | |
1950 | extent_op); | |
1951 | } else { | |
1952 | BUG(); | |
1953 | } | |
1954 | return ret; | |
1955 | } | |
1956 | ||
1957 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
1958 | struct extent_buffer *leaf, | |
1959 | struct btrfs_extent_item *ei) | |
1960 | { | |
1961 | u64 flags = btrfs_extent_flags(leaf, ei); | |
1962 | if (extent_op->update_flags) { | |
1963 | flags |= extent_op->flags_to_set; | |
1964 | btrfs_set_extent_flags(leaf, ei, flags); | |
1965 | } | |
1966 | ||
1967 | if (extent_op->update_key) { | |
1968 | struct btrfs_tree_block_info *bi; | |
1969 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
1970 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
1971 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
1972 | } | |
1973 | } | |
1974 | ||
1975 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
1976 | struct btrfs_root *root, | |
1977 | struct btrfs_delayed_ref_node *node, | |
1978 | struct btrfs_delayed_extent_op *extent_op) | |
1979 | { | |
1980 | struct btrfs_key key; | |
1981 | struct btrfs_path *path; | |
1982 | struct btrfs_extent_item *ei; | |
1983 | struct extent_buffer *leaf; | |
1984 | u32 item_size; | |
56bec294 | 1985 | int ret; |
5d4f98a2 YZ |
1986 | int err = 0; |
1987 | ||
1988 | path = btrfs_alloc_path(); | |
1989 | if (!path) | |
1990 | return -ENOMEM; | |
1991 | ||
1992 | key.objectid = node->bytenr; | |
1993 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1994 | key.offset = node->num_bytes; | |
1995 | ||
1996 | path->reada = 1; | |
1997 | path->leave_spinning = 1; | |
1998 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
1999 | path, 0, 1); | |
2000 | if (ret < 0) { | |
2001 | err = ret; | |
2002 | goto out; | |
2003 | } | |
2004 | if (ret > 0) { | |
2005 | err = -EIO; | |
2006 | goto out; | |
2007 | } | |
2008 | ||
2009 | leaf = path->nodes[0]; | |
2010 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2011 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2012 | if (item_size < sizeof(*ei)) { | |
2013 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2014 | path, (u64)-1, 0); | |
2015 | if (ret < 0) { | |
2016 | err = ret; | |
2017 | goto out; | |
2018 | } | |
2019 | leaf = path->nodes[0]; | |
2020 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2021 | } | |
2022 | #endif | |
2023 | BUG_ON(item_size < sizeof(*ei)); | |
2024 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2025 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2026 | |
5d4f98a2 YZ |
2027 | btrfs_mark_buffer_dirty(leaf); |
2028 | out: | |
2029 | btrfs_free_path(path); | |
2030 | return err; | |
56bec294 CM |
2031 | } |
2032 | ||
5d4f98a2 YZ |
2033 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2034 | struct btrfs_root *root, | |
2035 | struct btrfs_delayed_ref_node *node, | |
2036 | struct btrfs_delayed_extent_op *extent_op, | |
2037 | int insert_reserved) | |
56bec294 CM |
2038 | { |
2039 | int ret = 0; | |
5d4f98a2 YZ |
2040 | struct btrfs_delayed_tree_ref *ref; |
2041 | struct btrfs_key ins; | |
2042 | u64 parent = 0; | |
2043 | u64 ref_root = 0; | |
56bec294 | 2044 | |
5d4f98a2 YZ |
2045 | ins.objectid = node->bytenr; |
2046 | ins.offset = node->num_bytes; | |
2047 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2048 | |
5d4f98a2 YZ |
2049 | ref = btrfs_delayed_node_to_tree_ref(node); |
2050 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2051 | parent = ref->parent; | |
2052 | else | |
2053 | ref_root = ref->root; | |
2054 | ||
2055 | BUG_ON(node->ref_mod != 1); | |
2056 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2057 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2058 | !extent_op->update_key); | |
2059 | ret = alloc_reserved_tree_block(trans, root, | |
2060 | parent, ref_root, | |
2061 | extent_op->flags_to_set, | |
2062 | &extent_op->key, | |
2063 | ref->level, &ins); | |
5d4f98a2 YZ |
2064 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2065 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2066 | node->num_bytes, parent, ref_root, | |
2067 | ref->level, 0, 1, extent_op); | |
2068 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2069 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2070 | node->num_bytes, parent, ref_root, | |
2071 | ref->level, 0, 1, extent_op); | |
2072 | } else { | |
2073 | BUG(); | |
2074 | } | |
56bec294 CM |
2075 | return ret; |
2076 | } | |
2077 | ||
2078 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2079 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2080 | struct btrfs_root *root, | |
2081 | struct btrfs_delayed_ref_node *node, | |
2082 | struct btrfs_delayed_extent_op *extent_op, | |
2083 | int insert_reserved) | |
56bec294 CM |
2084 | { |
2085 | int ret; | |
5d4f98a2 | 2086 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2087 | struct btrfs_delayed_ref_head *head; |
2088 | /* | |
2089 | * we've hit the end of the chain and we were supposed | |
2090 | * to insert this extent into the tree. But, it got | |
2091 | * deleted before we ever needed to insert it, so all | |
2092 | * we have to do is clean up the accounting | |
2093 | */ | |
5d4f98a2 YZ |
2094 | BUG_ON(extent_op); |
2095 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2096 | if (insert_reserved) { |
f0486c68 YZ |
2097 | btrfs_pin_extent(root, node->bytenr, |
2098 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2099 | if (head->is_data) { |
2100 | ret = btrfs_del_csums(trans, root, | |
2101 | node->bytenr, | |
2102 | node->num_bytes); | |
2103 | BUG_ON(ret); | |
2104 | } | |
56bec294 | 2105 | } |
56bec294 CM |
2106 | mutex_unlock(&head->mutex); |
2107 | return 0; | |
2108 | } | |
2109 | ||
5d4f98a2 YZ |
2110 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2111 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2112 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2113 | insert_reserved); | |
2114 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2115 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2116 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2117 | insert_reserved); | |
2118 | else | |
2119 | BUG(); | |
2120 | return ret; | |
56bec294 CM |
2121 | } |
2122 | ||
2123 | static noinline struct btrfs_delayed_ref_node * | |
2124 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2125 | { | |
2126 | struct rb_node *node; | |
2127 | struct btrfs_delayed_ref_node *ref; | |
2128 | int action = BTRFS_ADD_DELAYED_REF; | |
2129 | again: | |
2130 | /* | |
2131 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2132 | * this prevents ref count from going down to zero when | |
2133 | * there still are pending delayed ref. | |
2134 | */ | |
2135 | node = rb_prev(&head->node.rb_node); | |
2136 | while (1) { | |
2137 | if (!node) | |
2138 | break; | |
2139 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2140 | rb_node); | |
2141 | if (ref->bytenr != head->node.bytenr) | |
2142 | break; | |
5d4f98a2 | 2143 | if (ref->action == action) |
56bec294 CM |
2144 | return ref; |
2145 | node = rb_prev(node); | |
2146 | } | |
2147 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2148 | action = BTRFS_DROP_DELAYED_REF; | |
2149 | goto again; | |
2150 | } | |
2151 | return NULL; | |
2152 | } | |
2153 | ||
c3e69d58 CM |
2154 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2155 | struct btrfs_root *root, | |
2156 | struct list_head *cluster) | |
56bec294 | 2157 | { |
56bec294 CM |
2158 | struct btrfs_delayed_ref_root *delayed_refs; |
2159 | struct btrfs_delayed_ref_node *ref; | |
2160 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2161 | struct btrfs_delayed_extent_op *extent_op; |
56bec294 | 2162 | int ret; |
c3e69d58 | 2163 | int count = 0; |
56bec294 | 2164 | int must_insert_reserved = 0; |
56bec294 CM |
2165 | |
2166 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2167 | while (1) { |
2168 | if (!locked_ref) { | |
c3e69d58 CM |
2169 | /* pick a new head ref from the cluster list */ |
2170 | if (list_empty(cluster)) | |
56bec294 | 2171 | break; |
56bec294 | 2172 | |
c3e69d58 CM |
2173 | locked_ref = list_entry(cluster->next, |
2174 | struct btrfs_delayed_ref_head, cluster); | |
2175 | ||
2176 | /* grab the lock that says we are going to process | |
2177 | * all the refs for this head */ | |
2178 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2179 | ||
2180 | /* | |
2181 | * we may have dropped the spin lock to get the head | |
2182 | * mutex lock, and that might have given someone else | |
2183 | * time to free the head. If that's true, it has been | |
2184 | * removed from our list and we can move on. | |
2185 | */ | |
2186 | if (ret == -EAGAIN) { | |
2187 | locked_ref = NULL; | |
2188 | count++; | |
2189 | continue; | |
56bec294 CM |
2190 | } |
2191 | } | |
a28ec197 | 2192 | |
56bec294 CM |
2193 | /* |
2194 | * record the must insert reserved flag before we | |
2195 | * drop the spin lock. | |
2196 | */ | |
2197 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2198 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2199 | |
5d4f98a2 YZ |
2200 | extent_op = locked_ref->extent_op; |
2201 | locked_ref->extent_op = NULL; | |
2202 | ||
56bec294 CM |
2203 | /* |
2204 | * locked_ref is the head node, so we have to go one | |
2205 | * node back for any delayed ref updates | |
2206 | */ | |
56bec294 CM |
2207 | ref = select_delayed_ref(locked_ref); |
2208 | if (!ref) { | |
2209 | /* All delayed refs have been processed, Go ahead | |
2210 | * and send the head node to run_one_delayed_ref, | |
2211 | * so that any accounting fixes can happen | |
2212 | */ | |
2213 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2214 | |
2215 | if (extent_op && must_insert_reserved) { | |
2216 | kfree(extent_op); | |
2217 | extent_op = NULL; | |
2218 | } | |
2219 | ||
2220 | if (extent_op) { | |
2221 | spin_unlock(&delayed_refs->lock); | |
2222 | ||
2223 | ret = run_delayed_extent_op(trans, root, | |
2224 | ref, extent_op); | |
2225 | BUG_ON(ret); | |
2226 | kfree(extent_op); | |
2227 | ||
2228 | cond_resched(); | |
2229 | spin_lock(&delayed_refs->lock); | |
2230 | continue; | |
2231 | } | |
2232 | ||
c3e69d58 | 2233 | list_del_init(&locked_ref->cluster); |
56bec294 CM |
2234 | locked_ref = NULL; |
2235 | } | |
02217ed2 | 2236 | |
56bec294 CM |
2237 | ref->in_tree = 0; |
2238 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2239 | delayed_refs->num_entries--; | |
5d4f98a2 | 2240 | |
56bec294 | 2241 | spin_unlock(&delayed_refs->lock); |
925baedd | 2242 | |
5d4f98a2 | 2243 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 CM |
2244 | must_insert_reserved); |
2245 | BUG_ON(ret); | |
eb099670 | 2246 | |
5d4f98a2 YZ |
2247 | btrfs_put_delayed_ref(ref); |
2248 | kfree(extent_op); | |
c3e69d58 | 2249 | count++; |
5d4f98a2 | 2250 | |
c3e69d58 CM |
2251 | cond_resched(); |
2252 | spin_lock(&delayed_refs->lock); | |
2253 | } | |
2254 | return count; | |
2255 | } | |
2256 | ||
2257 | /* | |
2258 | * this starts processing the delayed reference count updates and | |
2259 | * extent insertions we have queued up so far. count can be | |
2260 | * 0, which means to process everything in the tree at the start | |
2261 | * of the run (but not newly added entries), or it can be some target | |
2262 | * number you'd like to process. | |
2263 | */ | |
2264 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2265 | struct btrfs_root *root, unsigned long count) | |
2266 | { | |
2267 | struct rb_node *node; | |
2268 | struct btrfs_delayed_ref_root *delayed_refs; | |
2269 | struct btrfs_delayed_ref_node *ref; | |
2270 | struct list_head cluster; | |
2271 | int ret; | |
2272 | int run_all = count == (unsigned long)-1; | |
2273 | int run_most = 0; | |
2274 | ||
2275 | if (root == root->fs_info->extent_root) | |
2276 | root = root->fs_info->tree_root; | |
2277 | ||
2278 | delayed_refs = &trans->transaction->delayed_refs; | |
2279 | INIT_LIST_HEAD(&cluster); | |
2280 | again: | |
2281 | spin_lock(&delayed_refs->lock); | |
2282 | if (count == 0) { | |
2283 | count = delayed_refs->num_entries * 2; | |
2284 | run_most = 1; | |
2285 | } | |
2286 | while (1) { | |
2287 | if (!(run_all || run_most) && | |
2288 | delayed_refs->num_heads_ready < 64) | |
2289 | break; | |
eb099670 | 2290 | |
56bec294 | 2291 | /* |
c3e69d58 CM |
2292 | * go find something we can process in the rbtree. We start at |
2293 | * the beginning of the tree, and then build a cluster | |
2294 | * of refs to process starting at the first one we are able to | |
2295 | * lock | |
56bec294 | 2296 | */ |
c3e69d58 CM |
2297 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2298 | delayed_refs->run_delayed_start); | |
2299 | if (ret) | |
56bec294 CM |
2300 | break; |
2301 | ||
c3e69d58 CM |
2302 | ret = run_clustered_refs(trans, root, &cluster); |
2303 | BUG_ON(ret < 0); | |
2304 | ||
2305 | count -= min_t(unsigned long, ret, count); | |
2306 | ||
2307 | if (count == 0) | |
2308 | break; | |
eb099670 | 2309 | } |
c3e69d58 | 2310 | |
56bec294 | 2311 | if (run_all) { |
56bec294 | 2312 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2313 | if (!node) |
56bec294 | 2314 | goto out; |
c3e69d58 | 2315 | count = (unsigned long)-1; |
e9d0b13b | 2316 | |
56bec294 CM |
2317 | while (node) { |
2318 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2319 | rb_node); | |
2320 | if (btrfs_delayed_ref_is_head(ref)) { | |
2321 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2322 | |
56bec294 CM |
2323 | head = btrfs_delayed_node_to_head(ref); |
2324 | atomic_inc(&ref->refs); | |
2325 | ||
2326 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2327 | /* |
2328 | * Mutex was contended, block until it's | |
2329 | * released and try again | |
2330 | */ | |
56bec294 CM |
2331 | mutex_lock(&head->mutex); |
2332 | mutex_unlock(&head->mutex); | |
2333 | ||
2334 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2335 | cond_resched(); |
56bec294 CM |
2336 | goto again; |
2337 | } | |
2338 | node = rb_next(node); | |
2339 | } | |
2340 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2341 | schedule_timeout(1); |
2342 | goto again; | |
5f39d397 | 2343 | } |
54aa1f4d | 2344 | out: |
c3e69d58 | 2345 | spin_unlock(&delayed_refs->lock); |
a28ec197 CM |
2346 | return 0; |
2347 | } | |
2348 | ||
5d4f98a2 YZ |
2349 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2350 | struct btrfs_root *root, | |
2351 | u64 bytenr, u64 num_bytes, u64 flags, | |
2352 | int is_data) | |
2353 | { | |
2354 | struct btrfs_delayed_extent_op *extent_op; | |
2355 | int ret; | |
2356 | ||
2357 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
2358 | if (!extent_op) | |
2359 | return -ENOMEM; | |
2360 | ||
2361 | extent_op->flags_to_set = flags; | |
2362 | extent_op->update_flags = 1; | |
2363 | extent_op->update_key = 0; | |
2364 | extent_op->is_data = is_data ? 1 : 0; | |
2365 | ||
2366 | ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); | |
2367 | if (ret) | |
2368 | kfree(extent_op); | |
2369 | return ret; | |
2370 | } | |
2371 | ||
2372 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2373 | struct btrfs_root *root, | |
2374 | struct btrfs_path *path, | |
2375 | u64 objectid, u64 offset, u64 bytenr) | |
2376 | { | |
2377 | struct btrfs_delayed_ref_head *head; | |
2378 | struct btrfs_delayed_ref_node *ref; | |
2379 | struct btrfs_delayed_data_ref *data_ref; | |
2380 | struct btrfs_delayed_ref_root *delayed_refs; | |
2381 | struct rb_node *node; | |
2382 | int ret = 0; | |
2383 | ||
2384 | ret = -ENOENT; | |
2385 | delayed_refs = &trans->transaction->delayed_refs; | |
2386 | spin_lock(&delayed_refs->lock); | |
2387 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2388 | if (!head) | |
2389 | goto out; | |
2390 | ||
2391 | if (!mutex_trylock(&head->mutex)) { | |
2392 | atomic_inc(&head->node.refs); | |
2393 | spin_unlock(&delayed_refs->lock); | |
2394 | ||
b3b4aa74 | 2395 | btrfs_release_path(path); |
5d4f98a2 | 2396 | |
8cc33e5c DS |
2397 | /* |
2398 | * Mutex was contended, block until it's released and let | |
2399 | * caller try again | |
2400 | */ | |
5d4f98a2 YZ |
2401 | mutex_lock(&head->mutex); |
2402 | mutex_unlock(&head->mutex); | |
2403 | btrfs_put_delayed_ref(&head->node); | |
2404 | return -EAGAIN; | |
2405 | } | |
2406 | ||
2407 | node = rb_prev(&head->node.rb_node); | |
2408 | if (!node) | |
2409 | goto out_unlock; | |
2410 | ||
2411 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2412 | ||
2413 | if (ref->bytenr != bytenr) | |
2414 | goto out_unlock; | |
2415 | ||
2416 | ret = 1; | |
2417 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2418 | goto out_unlock; | |
2419 | ||
2420 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2421 | ||
2422 | node = rb_prev(node); | |
2423 | if (node) { | |
2424 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2425 | if (ref->bytenr == bytenr) | |
2426 | goto out_unlock; | |
2427 | } | |
2428 | ||
2429 | if (data_ref->root != root->root_key.objectid || | |
2430 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2431 | goto out_unlock; | |
2432 | ||
2433 | ret = 0; | |
2434 | out_unlock: | |
2435 | mutex_unlock(&head->mutex); | |
2436 | out: | |
2437 | spin_unlock(&delayed_refs->lock); | |
2438 | return ret; | |
2439 | } | |
2440 | ||
2441 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2442 | struct btrfs_root *root, | |
2443 | struct btrfs_path *path, | |
2444 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2445 | { |
2446 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2447 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2448 | struct btrfs_extent_data_ref *ref; |
2449 | struct btrfs_extent_inline_ref *iref; | |
2450 | struct btrfs_extent_item *ei; | |
f321e491 | 2451 | struct btrfs_key key; |
5d4f98a2 | 2452 | u32 item_size; |
be20aa9d | 2453 | int ret; |
925baedd | 2454 | |
be20aa9d | 2455 | key.objectid = bytenr; |
31840ae1 | 2456 | key.offset = (u64)-1; |
f321e491 | 2457 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2458 | |
be20aa9d CM |
2459 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2460 | if (ret < 0) | |
2461 | goto out; | |
2462 | BUG_ON(ret == 0); | |
80ff3856 YZ |
2463 | |
2464 | ret = -ENOENT; | |
2465 | if (path->slots[0] == 0) | |
31840ae1 | 2466 | goto out; |
be20aa9d | 2467 | |
31840ae1 | 2468 | path->slots[0]--; |
f321e491 | 2469 | leaf = path->nodes[0]; |
5d4f98a2 | 2470 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2471 | |
5d4f98a2 | 2472 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2473 | goto out; |
f321e491 | 2474 | |
5d4f98a2 YZ |
2475 | ret = 1; |
2476 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2477 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2478 | if (item_size < sizeof(*ei)) { | |
2479 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2480 | goto out; | |
2481 | } | |
2482 | #endif | |
2483 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2484 | |
5d4f98a2 YZ |
2485 | if (item_size != sizeof(*ei) + |
2486 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2487 | goto out; | |
be20aa9d | 2488 | |
5d4f98a2 YZ |
2489 | if (btrfs_extent_generation(leaf, ei) <= |
2490 | btrfs_root_last_snapshot(&root->root_item)) | |
2491 | goto out; | |
2492 | ||
2493 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2494 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2495 | BTRFS_EXTENT_DATA_REF_KEY) | |
2496 | goto out; | |
2497 | ||
2498 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2499 | if (btrfs_extent_refs(leaf, ei) != | |
2500 | btrfs_extent_data_ref_count(leaf, ref) || | |
2501 | btrfs_extent_data_ref_root(leaf, ref) != | |
2502 | root->root_key.objectid || | |
2503 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2504 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2505 | goto out; | |
2506 | ||
2507 | ret = 0; | |
2508 | out: | |
2509 | return ret; | |
2510 | } | |
2511 | ||
2512 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2513 | struct btrfs_root *root, | |
2514 | u64 objectid, u64 offset, u64 bytenr) | |
2515 | { | |
2516 | struct btrfs_path *path; | |
2517 | int ret; | |
2518 | int ret2; | |
2519 | ||
2520 | path = btrfs_alloc_path(); | |
2521 | if (!path) | |
2522 | return -ENOENT; | |
2523 | ||
2524 | do { | |
2525 | ret = check_committed_ref(trans, root, path, objectid, | |
2526 | offset, bytenr); | |
2527 | if (ret && ret != -ENOENT) | |
f321e491 | 2528 | goto out; |
80ff3856 | 2529 | |
5d4f98a2 YZ |
2530 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2531 | offset, bytenr); | |
2532 | } while (ret2 == -EAGAIN); | |
2533 | ||
2534 | if (ret2 && ret2 != -ENOENT) { | |
2535 | ret = ret2; | |
2536 | goto out; | |
f321e491 | 2537 | } |
5d4f98a2 YZ |
2538 | |
2539 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2540 | ret = 0; | |
be20aa9d | 2541 | out: |
80ff3856 | 2542 | btrfs_free_path(path); |
f0486c68 YZ |
2543 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2544 | WARN_ON(ret > 0); | |
f321e491 | 2545 | return ret; |
be20aa9d | 2546 | } |
c5739bba | 2547 | |
5d4f98a2 | 2548 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2549 | struct btrfs_root *root, |
5d4f98a2 YZ |
2550 | struct extent_buffer *buf, |
2551 | int full_backref, int inc) | |
31840ae1 ZY |
2552 | { |
2553 | u64 bytenr; | |
5d4f98a2 YZ |
2554 | u64 num_bytes; |
2555 | u64 parent; | |
31840ae1 | 2556 | u64 ref_root; |
31840ae1 | 2557 | u32 nritems; |
31840ae1 ZY |
2558 | struct btrfs_key key; |
2559 | struct btrfs_file_extent_item *fi; | |
2560 | int i; | |
2561 | int level; | |
2562 | int ret = 0; | |
31840ae1 | 2563 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
5d4f98a2 | 2564 | u64, u64, u64, u64, u64, u64); |
31840ae1 ZY |
2565 | |
2566 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2567 | nritems = btrfs_header_nritems(buf); |
2568 | level = btrfs_header_level(buf); | |
2569 | ||
5d4f98a2 YZ |
2570 | if (!root->ref_cows && level == 0) |
2571 | return 0; | |
31840ae1 | 2572 | |
5d4f98a2 YZ |
2573 | if (inc) |
2574 | process_func = btrfs_inc_extent_ref; | |
2575 | else | |
2576 | process_func = btrfs_free_extent; | |
31840ae1 | 2577 | |
5d4f98a2 YZ |
2578 | if (full_backref) |
2579 | parent = buf->start; | |
2580 | else | |
2581 | parent = 0; | |
2582 | ||
2583 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2584 | if (level == 0) { |
5d4f98a2 | 2585 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2586 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2587 | continue; | |
5d4f98a2 | 2588 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2589 | struct btrfs_file_extent_item); |
2590 | if (btrfs_file_extent_type(buf, fi) == | |
2591 | BTRFS_FILE_EXTENT_INLINE) | |
2592 | continue; | |
2593 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2594 | if (bytenr == 0) | |
2595 | continue; | |
5d4f98a2 YZ |
2596 | |
2597 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2598 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2599 | ret = process_func(trans, root, bytenr, num_bytes, | |
2600 | parent, ref_root, key.objectid, | |
2601 | key.offset); | |
31840ae1 ZY |
2602 | if (ret) |
2603 | goto fail; | |
2604 | } else { | |
5d4f98a2 YZ |
2605 | bytenr = btrfs_node_blockptr(buf, i); |
2606 | num_bytes = btrfs_level_size(root, level - 1); | |
2607 | ret = process_func(trans, root, bytenr, num_bytes, | |
2608 | parent, ref_root, level - 1, 0); | |
31840ae1 ZY |
2609 | if (ret) |
2610 | goto fail; | |
2611 | } | |
2612 | } | |
2613 | return 0; | |
2614 | fail: | |
5d4f98a2 YZ |
2615 | BUG(); |
2616 | return ret; | |
2617 | } | |
2618 | ||
2619 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2620 | struct extent_buffer *buf, int full_backref) | |
2621 | { | |
2622 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
2623 | } | |
2624 | ||
2625 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
2626 | struct extent_buffer *buf, int full_backref) | |
2627 | { | |
2628 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
31840ae1 ZY |
2629 | } |
2630 | ||
9078a3e1 CM |
2631 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2632 | struct btrfs_root *root, | |
2633 | struct btrfs_path *path, | |
2634 | struct btrfs_block_group_cache *cache) | |
2635 | { | |
2636 | int ret; | |
9078a3e1 | 2637 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2638 | unsigned long bi; |
2639 | struct extent_buffer *leaf; | |
9078a3e1 | 2640 | |
9078a3e1 | 2641 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2642 | if (ret < 0) |
2643 | goto fail; | |
9078a3e1 | 2644 | BUG_ON(ret); |
5f39d397 CM |
2645 | |
2646 | leaf = path->nodes[0]; | |
2647 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2648 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2649 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2650 | btrfs_release_path(path); |
54aa1f4d | 2651 | fail: |
9078a3e1 CM |
2652 | if (ret) |
2653 | return ret; | |
9078a3e1 CM |
2654 | return 0; |
2655 | ||
2656 | } | |
2657 | ||
4a8c9a62 YZ |
2658 | static struct btrfs_block_group_cache * |
2659 | next_block_group(struct btrfs_root *root, | |
2660 | struct btrfs_block_group_cache *cache) | |
2661 | { | |
2662 | struct rb_node *node; | |
2663 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2664 | node = rb_next(&cache->cache_node); | |
2665 | btrfs_put_block_group(cache); | |
2666 | if (node) { | |
2667 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2668 | cache_node); | |
11dfe35a | 2669 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2670 | } else |
2671 | cache = NULL; | |
2672 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2673 | return cache; | |
2674 | } | |
2675 | ||
0af3d00b JB |
2676 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2677 | struct btrfs_trans_handle *trans, | |
2678 | struct btrfs_path *path) | |
2679 | { | |
2680 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2681 | struct inode *inode = NULL; | |
2682 | u64 alloc_hint = 0; | |
2b20982e | 2683 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2684 | int num_pages = 0; |
2685 | int retries = 0; | |
2686 | int ret = 0; | |
2687 | ||
2688 | /* | |
2689 | * If this block group is smaller than 100 megs don't bother caching the | |
2690 | * block group. | |
2691 | */ | |
2692 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2693 | spin_lock(&block_group->lock); | |
2694 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
2695 | spin_unlock(&block_group->lock); | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | again: | |
2700 | inode = lookup_free_space_inode(root, block_group, path); | |
2701 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
2702 | ret = PTR_ERR(inode); | |
b3b4aa74 | 2703 | btrfs_release_path(path); |
0af3d00b JB |
2704 | goto out; |
2705 | } | |
2706 | ||
2707 | if (IS_ERR(inode)) { | |
2708 | BUG_ON(retries); | |
2709 | retries++; | |
2710 | ||
2711 | if (block_group->ro) | |
2712 | goto out_free; | |
2713 | ||
2714 | ret = create_free_space_inode(root, trans, block_group, path); | |
2715 | if (ret) | |
2716 | goto out_free; | |
2717 | goto again; | |
2718 | } | |
2719 | ||
5b0e95bf JB |
2720 | /* We've already setup this transaction, go ahead and exit */ |
2721 | if (block_group->cache_generation == trans->transid && | |
2722 | i_size_read(inode)) { | |
2723 | dcs = BTRFS_DC_SETUP; | |
2724 | goto out_put; | |
2725 | } | |
2726 | ||
0af3d00b JB |
2727 | /* |
2728 | * We want to set the generation to 0, that way if anything goes wrong | |
2729 | * from here on out we know not to trust this cache when we load up next | |
2730 | * time. | |
2731 | */ | |
2732 | BTRFS_I(inode)->generation = 0; | |
2733 | ret = btrfs_update_inode(trans, root, inode); | |
2734 | WARN_ON(ret); | |
2735 | ||
2736 | if (i_size_read(inode) > 0) { | |
2737 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
2738 | inode); | |
2739 | if (ret) | |
2740 | goto out_put; | |
2741 | } | |
2742 | ||
2743 | spin_lock(&block_group->lock); | |
2744 | if (block_group->cached != BTRFS_CACHE_FINISHED) { | |
2b20982e JB |
2745 | /* We're not cached, don't bother trying to write stuff out */ |
2746 | dcs = BTRFS_DC_WRITTEN; | |
0af3d00b JB |
2747 | spin_unlock(&block_group->lock); |
2748 | goto out_put; | |
2749 | } | |
2750 | spin_unlock(&block_group->lock); | |
2751 | ||
2752 | num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024); | |
2753 | if (!num_pages) | |
2754 | num_pages = 1; | |
2755 | ||
2756 | /* | |
2757 | * Just to make absolutely sure we have enough space, we're going to | |
2758 | * preallocate 12 pages worth of space for each block group. In | |
2759 | * practice we ought to use at most 8, but we need extra space so we can | |
2760 | * add our header and have a terminator between the extents and the | |
2761 | * bitmaps. | |
2762 | */ | |
2763 | num_pages *= 16; | |
2764 | num_pages *= PAGE_CACHE_SIZE; | |
2765 | ||
5b0e95bf | 2766 | ret = btrfs_check_data_free_space(inode, num_pages); |
0af3d00b JB |
2767 | if (ret) |
2768 | goto out_put; | |
2769 | ||
2770 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
2771 | num_pages, num_pages, | |
2772 | &alloc_hint); | |
5b0e95bf | 2773 | if (!ret) |
2b20982e | 2774 | dcs = BTRFS_DC_SETUP; |
5b0e95bf | 2775 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 2776 | |
0af3d00b JB |
2777 | out_put: |
2778 | iput(inode); | |
2779 | out_free: | |
b3b4aa74 | 2780 | btrfs_release_path(path); |
0af3d00b JB |
2781 | out: |
2782 | spin_lock(&block_group->lock); | |
5b0e95bf JB |
2783 | if (!ret) |
2784 | block_group->cache_generation = trans->transid; | |
2b20982e | 2785 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
2786 | spin_unlock(&block_group->lock); |
2787 | ||
2788 | return ret; | |
2789 | } | |
2790 | ||
96b5179d CM |
2791 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
2792 | struct btrfs_root *root) | |
9078a3e1 | 2793 | { |
4a8c9a62 | 2794 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 2795 | int err = 0; |
9078a3e1 | 2796 | struct btrfs_path *path; |
96b5179d | 2797 | u64 last = 0; |
9078a3e1 CM |
2798 | |
2799 | path = btrfs_alloc_path(); | |
2800 | if (!path) | |
2801 | return -ENOMEM; | |
2802 | ||
0af3d00b JB |
2803 | again: |
2804 | while (1) { | |
2805 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2806 | while (cache) { | |
2807 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
2808 | break; | |
2809 | cache = next_block_group(root, cache); | |
2810 | } | |
2811 | if (!cache) { | |
2812 | if (last == 0) | |
2813 | break; | |
2814 | last = 0; | |
2815 | continue; | |
2816 | } | |
2817 | err = cache_save_setup(cache, trans, path); | |
2818 | last = cache->key.objectid + cache->key.offset; | |
2819 | btrfs_put_block_group(cache); | |
2820 | } | |
2821 | ||
d397712b | 2822 | while (1) { |
4a8c9a62 YZ |
2823 | if (last == 0) { |
2824 | err = btrfs_run_delayed_refs(trans, root, | |
2825 | (unsigned long)-1); | |
2826 | BUG_ON(err); | |
0f9dd46c | 2827 | } |
54aa1f4d | 2828 | |
4a8c9a62 YZ |
2829 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
2830 | while (cache) { | |
0af3d00b JB |
2831 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
2832 | btrfs_put_block_group(cache); | |
2833 | goto again; | |
2834 | } | |
2835 | ||
4a8c9a62 YZ |
2836 | if (cache->dirty) |
2837 | break; | |
2838 | cache = next_block_group(root, cache); | |
2839 | } | |
2840 | if (!cache) { | |
2841 | if (last == 0) | |
2842 | break; | |
2843 | last = 0; | |
2844 | continue; | |
2845 | } | |
0f9dd46c | 2846 | |
0cb59c99 JB |
2847 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
2848 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 2849 | cache->dirty = 0; |
4a8c9a62 | 2850 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 2851 | |
4a8c9a62 YZ |
2852 | err = write_one_cache_group(trans, root, path, cache); |
2853 | BUG_ON(err); | |
2854 | btrfs_put_block_group(cache); | |
9078a3e1 | 2855 | } |
4a8c9a62 | 2856 | |
0cb59c99 JB |
2857 | while (1) { |
2858 | /* | |
2859 | * I don't think this is needed since we're just marking our | |
2860 | * preallocated extent as written, but just in case it can't | |
2861 | * hurt. | |
2862 | */ | |
2863 | if (last == 0) { | |
2864 | err = btrfs_run_delayed_refs(trans, root, | |
2865 | (unsigned long)-1); | |
2866 | BUG_ON(err); | |
2867 | } | |
2868 | ||
2869 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
2870 | while (cache) { | |
2871 | /* | |
2872 | * Really this shouldn't happen, but it could if we | |
2873 | * couldn't write the entire preallocated extent and | |
2874 | * splitting the extent resulted in a new block. | |
2875 | */ | |
2876 | if (cache->dirty) { | |
2877 | btrfs_put_block_group(cache); | |
2878 | goto again; | |
2879 | } | |
2880 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2881 | break; | |
2882 | cache = next_block_group(root, cache); | |
2883 | } | |
2884 | if (!cache) { | |
2885 | if (last == 0) | |
2886 | break; | |
2887 | last = 0; | |
2888 | continue; | |
2889 | } | |
2890 | ||
2891 | btrfs_write_out_cache(root, trans, cache, path); | |
2892 | ||
2893 | /* | |
2894 | * If we didn't have an error then the cache state is still | |
2895 | * NEED_WRITE, so we can set it to WRITTEN. | |
2896 | */ | |
2897 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
2898 | cache->disk_cache_state = BTRFS_DC_WRITTEN; | |
2899 | last = cache->key.objectid + cache->key.offset; | |
2900 | btrfs_put_block_group(cache); | |
2901 | } | |
2902 | ||
9078a3e1 | 2903 | btrfs_free_path(path); |
4a8c9a62 | 2904 | return 0; |
9078a3e1 CM |
2905 | } |
2906 | ||
d2fb3437 YZ |
2907 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
2908 | { | |
2909 | struct btrfs_block_group_cache *block_group; | |
2910 | int readonly = 0; | |
2911 | ||
2912 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
2913 | if (!block_group || block_group->ro) | |
2914 | readonly = 1; | |
2915 | if (block_group) | |
fa9c0d79 | 2916 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
2917 | return readonly; |
2918 | } | |
2919 | ||
593060d7 CM |
2920 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
2921 | u64 total_bytes, u64 bytes_used, | |
2922 | struct btrfs_space_info **space_info) | |
2923 | { | |
2924 | struct btrfs_space_info *found; | |
b742bb82 YZ |
2925 | int i; |
2926 | int factor; | |
2927 | ||
2928 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2929 | BTRFS_BLOCK_GROUP_RAID10)) | |
2930 | factor = 2; | |
2931 | else | |
2932 | factor = 1; | |
593060d7 CM |
2933 | |
2934 | found = __find_space_info(info, flags); | |
2935 | if (found) { | |
25179201 | 2936 | spin_lock(&found->lock); |
593060d7 | 2937 | found->total_bytes += total_bytes; |
89a55897 | 2938 | found->disk_total += total_bytes * factor; |
593060d7 | 2939 | found->bytes_used += bytes_used; |
b742bb82 | 2940 | found->disk_used += bytes_used * factor; |
8f18cf13 | 2941 | found->full = 0; |
25179201 | 2942 | spin_unlock(&found->lock); |
593060d7 CM |
2943 | *space_info = found; |
2944 | return 0; | |
2945 | } | |
c146afad | 2946 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
2947 | if (!found) |
2948 | return -ENOMEM; | |
2949 | ||
b742bb82 YZ |
2950 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
2951 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 2952 | init_rwsem(&found->groups_sem); |
0f9dd46c | 2953 | spin_lock_init(&found->lock); |
b742bb82 YZ |
2954 | found->flags = flags & (BTRFS_BLOCK_GROUP_DATA | |
2955 | BTRFS_BLOCK_GROUP_SYSTEM | | |
2956 | BTRFS_BLOCK_GROUP_METADATA); | |
593060d7 | 2957 | found->total_bytes = total_bytes; |
89a55897 | 2958 | found->disk_total = total_bytes * factor; |
593060d7 | 2959 | found->bytes_used = bytes_used; |
b742bb82 | 2960 | found->disk_used = bytes_used * factor; |
593060d7 | 2961 | found->bytes_pinned = 0; |
e8569813 | 2962 | found->bytes_reserved = 0; |
c146afad | 2963 | found->bytes_readonly = 0; |
f0486c68 | 2964 | found->bytes_may_use = 0; |
593060d7 | 2965 | found->full = 0; |
0e4f8f88 | 2966 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 2967 | found->chunk_alloc = 0; |
fdb5effd JB |
2968 | found->flush = 0; |
2969 | init_waitqueue_head(&found->wait); | |
593060d7 | 2970 | *space_info = found; |
4184ea7f | 2971 | list_add_rcu(&found->list, &info->space_info); |
593060d7 CM |
2972 | return 0; |
2973 | } | |
2974 | ||
8790d502 CM |
2975 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
2976 | { | |
2977 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 2978 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 2979 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 2980 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
2981 | if (extra_flags) { |
2982 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
2983 | fs_info->avail_data_alloc_bits |= extra_flags; | |
2984 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
2985 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
2986 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
2987 | fs_info->avail_system_alloc_bits |= extra_flags; | |
2988 | } | |
2989 | } | |
593060d7 | 2990 | |
2b82032c | 2991 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 2992 | { |
cd02dca5 CM |
2993 | /* |
2994 | * we add in the count of missing devices because we want | |
2995 | * to make sure that any RAID levels on a degraded FS | |
2996 | * continue to be honored. | |
2997 | */ | |
2998 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
2999 | root->fs_info->fs_devices->missing_devices; | |
a061fc8d CM |
3000 | |
3001 | if (num_devices == 1) | |
3002 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
3003 | if (num_devices < 4) | |
3004 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3005 | ||
ec44a35c CM |
3006 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
3007 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 3008 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 3009 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 3010 | } |
ec44a35c CM |
3011 | |
3012 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 3013 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 3014 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 3015 | } |
ec44a35c CM |
3016 | |
3017 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
3018 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
3019 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
3020 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
3021 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
3022 | return flags; | |
3023 | } | |
3024 | ||
b742bb82 | 3025 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3026 | { |
b742bb82 YZ |
3027 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3028 | flags |= root->fs_info->avail_data_alloc_bits & | |
3029 | root->fs_info->data_alloc_profile; | |
3030 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3031 | flags |= root->fs_info->avail_system_alloc_bits & | |
3032 | root->fs_info->system_alloc_profile; | |
3033 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3034 | flags |= root->fs_info->avail_metadata_alloc_bits & | |
3035 | root->fs_info->metadata_alloc_profile; | |
3036 | return btrfs_reduce_alloc_profile(root, flags); | |
6a63209f JB |
3037 | } |
3038 | ||
6d07bcec | 3039 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3040 | { |
b742bb82 | 3041 | u64 flags; |
9ed74f2d | 3042 | |
b742bb82 YZ |
3043 | if (data) |
3044 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3045 | else if (root == root->fs_info->chunk_root) | |
3046 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3047 | else |
b742bb82 | 3048 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3049 | |
b742bb82 | 3050 | return get_alloc_profile(root, flags); |
6a63209f | 3051 | } |
9ed74f2d | 3052 | |
6a63209f JB |
3053 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
3054 | { | |
6a63209f | 3055 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
f0486c68 | 3056 | BTRFS_BLOCK_GROUP_DATA); |
9ed74f2d JB |
3057 | } |
3058 | ||
6a63209f | 3059 | /* |
6a63209f JB |
3060 | * This will check the space that the inode allocates from to make sure we have |
3061 | * enough space for bytes. | |
6a63209f | 3062 | */ |
0ca1f7ce | 3063 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3064 | { |
6a63209f | 3065 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3066 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ab6e2410 | 3067 | u64 used; |
0af3d00b | 3068 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3069 | |
6a63209f JB |
3070 | /* make sure bytes are sectorsize aligned */ |
3071 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
6a63209f | 3072 | |
82d5902d LZ |
3073 | if (root == root->fs_info->tree_root || |
3074 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3075 | alloc_chunk = 0; |
3076 | committed = 1; | |
3077 | } | |
3078 | ||
6a63209f | 3079 | data_sinfo = BTRFS_I(inode)->space_info; |
33b4d47f CM |
3080 | if (!data_sinfo) |
3081 | goto alloc; | |
9ed74f2d | 3082 | |
6a63209f JB |
3083 | again: |
3084 | /* make sure we have enough space to handle the data first */ | |
3085 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3086 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3087 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3088 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3089 | |
3090 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3091 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3092 | |
6a63209f JB |
3093 | /* |
3094 | * if we don't have enough free bytes in this space then we need | |
3095 | * to alloc a new chunk. | |
3096 | */ | |
0af3d00b | 3097 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3098 | u64 alloc_target; |
9ed74f2d | 3099 | |
0e4f8f88 | 3100 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3101 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3102 | alloc: |
6a63209f | 3103 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3104 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3105 | if (IS_ERR(trans)) |
3106 | return PTR_ERR(trans); | |
9ed74f2d | 3107 | |
6a63209f JB |
3108 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
3109 | bytes + 2 * 1024 * 1024, | |
0e4f8f88 CM |
3110 | alloc_target, |
3111 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3112 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3113 | if (ret < 0) { |
3114 | if (ret != -ENOSPC) | |
3115 | return ret; | |
3116 | else | |
3117 | goto commit_trans; | |
3118 | } | |
9ed74f2d | 3119 | |
33b4d47f CM |
3120 | if (!data_sinfo) { |
3121 | btrfs_set_inode_space_info(root, inode); | |
3122 | data_sinfo = BTRFS_I(inode)->space_info; | |
3123 | } | |
6a63209f JB |
3124 | goto again; |
3125 | } | |
f2bb8f5c JB |
3126 | |
3127 | /* | |
3128 | * If we have less pinned bytes than we want to allocate then | |
3129 | * don't bother committing the transaction, it won't help us. | |
3130 | */ | |
3131 | if (data_sinfo->bytes_pinned < bytes) | |
3132 | committed = 1; | |
6a63209f | 3133 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3134 | |
4e06bdd6 | 3135 | /* commit the current transaction and try again */ |
d52a5b5f | 3136 | commit_trans: |
a4abeea4 JB |
3137 | if (!committed && |
3138 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3139 | committed = 1; |
7a7eaa40 | 3140 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3141 | if (IS_ERR(trans)) |
3142 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3143 | ret = btrfs_commit_transaction(trans, root); |
3144 | if (ret) | |
3145 | return ret; | |
3146 | goto again; | |
3147 | } | |
9ed74f2d | 3148 | |
6a63209f JB |
3149 | return -ENOSPC; |
3150 | } | |
3151 | data_sinfo->bytes_may_use += bytes; | |
6a63209f | 3152 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3153 | |
9ed74f2d | 3154 | return 0; |
9ed74f2d | 3155 | } |
6a63209f | 3156 | |
6a63209f | 3157 | /* |
fb25e914 | 3158 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3159 | */ |
0ca1f7ce | 3160 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3161 | { |
0ca1f7ce | 3162 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3163 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3164 | |
6a63209f JB |
3165 | /* make sure bytes are sectorsize aligned */ |
3166 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
e3ccfa98 | 3167 | |
6a63209f JB |
3168 | data_sinfo = BTRFS_I(inode)->space_info; |
3169 | spin_lock(&data_sinfo->lock); | |
3170 | data_sinfo->bytes_may_use -= bytes; | |
6a63209f | 3171 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3172 | } |
3173 | ||
97e728d4 | 3174 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3175 | { |
97e728d4 JB |
3176 | struct list_head *head = &info->space_info; |
3177 | struct btrfs_space_info *found; | |
e3ccfa98 | 3178 | |
97e728d4 JB |
3179 | rcu_read_lock(); |
3180 | list_for_each_entry_rcu(found, head, list) { | |
3181 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3182 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3183 | } |
97e728d4 | 3184 | rcu_read_unlock(); |
e3ccfa98 JB |
3185 | } |
3186 | ||
e5bc2458 | 3187 | static int should_alloc_chunk(struct btrfs_root *root, |
0e4f8f88 CM |
3188 | struct btrfs_space_info *sinfo, u64 alloc_bytes, |
3189 | int force) | |
32c00aff | 3190 | { |
fb25e914 | 3191 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3192 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3193 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3194 | u64 thresh; |
e3ccfa98 | 3195 | |
0e4f8f88 CM |
3196 | if (force == CHUNK_ALLOC_FORCE) |
3197 | return 1; | |
3198 | ||
fb25e914 JB |
3199 | /* |
3200 | * We need to take into account the global rsv because for all intents | |
3201 | * and purposes it's used space. Don't worry about locking the | |
3202 | * global_rsv, it doesn't change except when the transaction commits. | |
3203 | */ | |
3204 | num_allocated += global_rsv->size; | |
3205 | ||
0e4f8f88 CM |
3206 | /* |
3207 | * in limited mode, we want to have some free space up to | |
3208 | * about 1% of the FS size. | |
3209 | */ | |
3210 | if (force == CHUNK_ALLOC_LIMITED) { | |
3211 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
3212 | thresh = max_t(u64, 64 * 1024 * 1024, | |
3213 | div_factor_fine(thresh, 1)); | |
3214 | ||
3215 | if (num_bytes - num_allocated < thresh) | |
3216 | return 1; | |
3217 | } | |
3218 | ||
3219 | /* | |
3220 | * we have two similar checks here, one based on percentage | |
3221 | * and once based on a hard number of 256MB. The idea | |
3222 | * is that if we have a good amount of free | |
3223 | * room, don't allocate a chunk. A good mount is | |
3224 | * less than 80% utilized of the chunks we have allocated, | |
3225 | * or more than 256MB free | |
3226 | */ | |
3227 | if (num_allocated + alloc_bytes + 256 * 1024 * 1024 < num_bytes) | |
424499db | 3228 | return 0; |
e3ccfa98 | 3229 | |
0e4f8f88 | 3230 | if (num_allocated + alloc_bytes < div_factor(num_bytes, 8)) |
424499db | 3231 | return 0; |
32c00aff | 3232 | |
e5bc2458 | 3233 | thresh = btrfs_super_total_bytes(&root->fs_info->super_copy); |
0e4f8f88 CM |
3234 | |
3235 | /* 256MB or 5% of the FS */ | |
e5bc2458 CM |
3236 | thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5)); |
3237 | ||
3238 | if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3)) | |
14ed0ca6 | 3239 | return 0; |
424499db | 3240 | return 1; |
32c00aff JB |
3241 | } |
3242 | ||
6324fbf3 CM |
3243 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
3244 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 3245 | u64 flags, int force) |
9ed74f2d | 3246 | { |
6324fbf3 | 3247 | struct btrfs_space_info *space_info; |
97e728d4 | 3248 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3249 | int wait_for_alloc = 0; |
9ed74f2d | 3250 | int ret = 0; |
9ed74f2d | 3251 | |
2b82032c | 3252 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
ec44a35c | 3253 | |
6324fbf3 | 3254 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3255 | if (!space_info) { |
3256 | ret = update_space_info(extent_root->fs_info, flags, | |
3257 | 0, 0, &space_info); | |
3258 | BUG_ON(ret); | |
9ed74f2d | 3259 | } |
6324fbf3 | 3260 | BUG_ON(!space_info); |
9ed74f2d | 3261 | |
6d74119f | 3262 | again: |
25179201 | 3263 | spin_lock(&space_info->lock); |
9ed74f2d | 3264 | if (space_info->force_alloc) |
0e4f8f88 | 3265 | force = space_info->force_alloc; |
25179201 JB |
3266 | if (space_info->full) { |
3267 | spin_unlock(&space_info->lock); | |
6d74119f | 3268 | return 0; |
9ed74f2d JB |
3269 | } |
3270 | ||
0e4f8f88 | 3271 | if (!should_alloc_chunk(extent_root, space_info, alloc_bytes, force)) { |
25179201 | 3272 | spin_unlock(&space_info->lock); |
6d74119f JB |
3273 | return 0; |
3274 | } else if (space_info->chunk_alloc) { | |
3275 | wait_for_alloc = 1; | |
3276 | } else { | |
3277 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3278 | } |
0e4f8f88 | 3279 | |
25179201 | 3280 | spin_unlock(&space_info->lock); |
9ed74f2d | 3281 | |
6d74119f JB |
3282 | mutex_lock(&fs_info->chunk_mutex); |
3283 | ||
3284 | /* | |
3285 | * The chunk_mutex is held throughout the entirety of a chunk | |
3286 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3287 | * other guy is done and we need to recheck and see if we should | |
3288 | * allocate. | |
3289 | */ | |
3290 | if (wait_for_alloc) { | |
3291 | mutex_unlock(&fs_info->chunk_mutex); | |
3292 | wait_for_alloc = 0; | |
3293 | goto again; | |
3294 | } | |
3295 | ||
67377734 JB |
3296 | /* |
3297 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3298 | * allocating mixed chunks instead of individual chunks. | |
3299 | */ | |
3300 | if (btrfs_mixed_space_info(space_info)) | |
3301 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3302 | ||
97e728d4 JB |
3303 | /* |
3304 | * if we're doing a data chunk, go ahead and make sure that | |
3305 | * we keep a reasonable number of metadata chunks allocated in the | |
3306 | * FS as well. | |
3307 | */ | |
9ed74f2d | 3308 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3309 | fs_info->data_chunk_allocations++; |
3310 | if (!(fs_info->data_chunk_allocations % | |
3311 | fs_info->metadata_ratio)) | |
3312 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3313 | } |
3314 | ||
2b82032c | 3315 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
92b8e897 MF |
3316 | if (ret < 0 && ret != -ENOSPC) |
3317 | goto out; | |
3318 | ||
9ed74f2d | 3319 | spin_lock(&space_info->lock); |
9ed74f2d | 3320 | if (ret) |
6324fbf3 | 3321 | space_info->full = 1; |
424499db YZ |
3322 | else |
3323 | ret = 1; | |
6d74119f | 3324 | |
0e4f8f88 | 3325 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3326 | space_info->chunk_alloc = 0; |
9ed74f2d | 3327 | spin_unlock(&space_info->lock); |
92b8e897 | 3328 | out: |
c146afad | 3329 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
0f9dd46c | 3330 | return ret; |
6324fbf3 | 3331 | } |
9ed74f2d | 3332 | |
9ed74f2d | 3333 | /* |
5da9d01b | 3334 | * shrink metadata reservation for delalloc |
9ed74f2d | 3335 | */ |
5da9d01b | 3336 | static int shrink_delalloc(struct btrfs_trans_handle *trans, |
f104d044 JB |
3337 | struct btrfs_root *root, u64 to_reclaim, |
3338 | bool wait_ordered) | |
5da9d01b | 3339 | { |
0ca1f7ce | 3340 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3341 | struct btrfs_space_info *space_info; |
5da9d01b YZ |
3342 | u64 reserved; |
3343 | u64 max_reclaim; | |
3344 | u64 reclaimed = 0; | |
b1953bce | 3345 | long time_left; |
877da174 | 3346 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3347 | int loops = 0; |
36e39c40 | 3348 | unsigned long progress; |
5da9d01b | 3349 | |
0ca1f7ce | 3350 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3351 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3352 | |
3353 | smp_mb(); | |
fb25e914 | 3354 | reserved = space_info->bytes_may_use; |
36e39c40 | 3355 | progress = space_info->reservation_progress; |
5da9d01b YZ |
3356 | |
3357 | if (reserved == 0) | |
3358 | return 0; | |
c4f675cd | 3359 | |
fdb5effd JB |
3360 | smp_mb(); |
3361 | if (root->fs_info->delalloc_bytes == 0) { | |
3362 | if (trans) | |
3363 | return 0; | |
3364 | btrfs_wait_ordered_extents(root, 0, 0); | |
3365 | return 0; | |
3366 | } | |
3367 | ||
5da9d01b | 3368 | max_reclaim = min(reserved, to_reclaim); |
877da174 JB |
3369 | nr_pages = max_t(unsigned long, nr_pages, |
3370 | max_reclaim >> PAGE_CACHE_SHIFT); | |
b1953bce | 3371 | while (loops < 1024) { |
bf9022e0 CM |
3372 | /* have the flusher threads jump in and do some IO */ |
3373 | smp_mb(); | |
3374 | nr_pages = min_t(unsigned long, nr_pages, | |
3375 | root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT); | |
3376 | writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); | |
5da9d01b | 3377 | |
0019f10d | 3378 | spin_lock(&space_info->lock); |
fb25e914 JB |
3379 | if (reserved > space_info->bytes_may_use) |
3380 | reclaimed += reserved - space_info->bytes_may_use; | |
3381 | reserved = space_info->bytes_may_use; | |
0019f10d | 3382 | spin_unlock(&space_info->lock); |
5da9d01b | 3383 | |
36e39c40 CM |
3384 | loops++; |
3385 | ||
5da9d01b YZ |
3386 | if (reserved == 0 || reclaimed >= max_reclaim) |
3387 | break; | |
3388 | ||
3389 | if (trans && trans->transaction->blocked) | |
3390 | return -EAGAIN; | |
bf9022e0 | 3391 | |
f104d044 JB |
3392 | if (wait_ordered && !trans) { |
3393 | btrfs_wait_ordered_extents(root, 0, 0); | |
3394 | } else { | |
3395 | time_left = schedule_timeout_interruptible(1); | |
b1953bce | 3396 | |
f104d044 JB |
3397 | /* We were interrupted, exit */ |
3398 | if (time_left) | |
3399 | break; | |
3400 | } | |
b1953bce | 3401 | |
36e39c40 CM |
3402 | /* we've kicked the IO a few times, if anything has been freed, |
3403 | * exit. There is no sense in looping here for a long time | |
3404 | * when we really need to commit the transaction, or there are | |
3405 | * just too many writers without enough free space | |
3406 | */ | |
3407 | ||
3408 | if (loops > 3) { | |
3409 | smp_mb(); | |
3410 | if (progress != space_info->reservation_progress) | |
3411 | break; | |
3412 | } | |
bf9022e0 | 3413 | |
5da9d01b | 3414 | } |
f104d044 | 3415 | |
5da9d01b YZ |
3416 | return reclaimed >= to_reclaim; |
3417 | } | |
3418 | ||
4a92b1b8 JB |
3419 | /** |
3420 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
3421 | * @root - the root we're allocating for | |
3422 | * @block_rsv - the block_rsv we're allocating for | |
3423 | * @orig_bytes - the number of bytes we want | |
3424 | * @flush - wether or not we can flush to make our reservation | |
8bb8ab2e | 3425 | * |
4a92b1b8 JB |
3426 | * This will reserve orgi_bytes number of bytes from the space info associated |
3427 | * with the block_rsv. If there is not enough space it will make an attempt to | |
3428 | * flush out space to make room. It will do this by flushing delalloc if | |
3429 | * possible or committing the transaction. If flush is 0 then no attempts to | |
3430 | * regain reservations will be made and this will fail if there is not enough | |
3431 | * space already. | |
8bb8ab2e | 3432 | */ |
4a92b1b8 | 3433 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 3434 | struct btrfs_block_rsv *block_rsv, |
36ba022a | 3435 | u64 orig_bytes, int flush) |
9ed74f2d | 3436 | { |
f0486c68 | 3437 | struct btrfs_space_info *space_info = block_rsv->space_info; |
4a92b1b8 | 3438 | struct btrfs_trans_handle *trans; |
2bf64758 | 3439 | u64 used; |
8bb8ab2e JB |
3440 | u64 num_bytes = orig_bytes; |
3441 | int retries = 0; | |
3442 | int ret = 0; | |
38227933 | 3443 | bool committed = false; |
fdb5effd | 3444 | bool flushing = false; |
f104d044 | 3445 | bool wait_ordered = false; |
4a92b1b8 JB |
3446 | |
3447 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
8bb8ab2e | 3448 | again: |
fdb5effd | 3449 | ret = 0; |
8bb8ab2e | 3450 | spin_lock(&space_info->lock); |
fdb5effd JB |
3451 | /* |
3452 | * We only want to wait if somebody other than us is flushing and we are | |
3453 | * actually alloed to flush. | |
3454 | */ | |
3455 | while (flush && !flushing && space_info->flush) { | |
3456 | spin_unlock(&space_info->lock); | |
3457 | /* | |
3458 | * If we have a trans handle we can't wait because the flusher | |
3459 | * may have to commit the transaction, which would mean we would | |
3460 | * deadlock since we are waiting for the flusher to finish, but | |
3461 | * hold the current transaction open. | |
3462 | */ | |
3463 | if (trans) | |
3464 | return -EAGAIN; | |
3465 | ret = wait_event_interruptible(space_info->wait, | |
3466 | !space_info->flush); | |
3467 | /* Must have been interrupted, return */ | |
3468 | if (ret) | |
3469 | return -EINTR; | |
3470 | ||
3471 | spin_lock(&space_info->lock); | |
3472 | } | |
3473 | ||
3474 | ret = -ENOSPC; | |
2bf64758 JB |
3475 | used = space_info->bytes_used + space_info->bytes_reserved + |
3476 | space_info->bytes_pinned + space_info->bytes_readonly + | |
3477 | space_info->bytes_may_use; | |
9ed74f2d | 3478 | |
8bb8ab2e JB |
3479 | /* |
3480 | * The idea here is that we've not already over-reserved the block group | |
3481 | * then we can go ahead and save our reservation first and then start | |
3482 | * flushing if we need to. Otherwise if we've already overcommitted | |
3483 | * lets start flushing stuff first and then come back and try to make | |
3484 | * our reservation. | |
3485 | */ | |
2bf64758 JB |
3486 | if (used <= space_info->total_bytes) { |
3487 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 3488 | space_info->bytes_may_use += orig_bytes; |
8bb8ab2e JB |
3489 | ret = 0; |
3490 | } else { | |
3491 | /* | |
3492 | * Ok set num_bytes to orig_bytes since we aren't | |
3493 | * overocmmitted, this way we only try and reclaim what | |
3494 | * we need. | |
3495 | */ | |
3496 | num_bytes = orig_bytes; | |
3497 | } | |
3498 | } else { | |
3499 | /* | |
3500 | * Ok we're over committed, set num_bytes to the overcommitted | |
3501 | * amount plus the amount of bytes that we need for this | |
3502 | * reservation. | |
3503 | */ | |
f104d044 | 3504 | wait_ordered = true; |
2bf64758 | 3505 | num_bytes = used - space_info->total_bytes + |
8bb8ab2e JB |
3506 | (orig_bytes * (retries + 1)); |
3507 | } | |
9ed74f2d | 3508 | |
36ba022a | 3509 | if (ret) { |
2bf64758 JB |
3510 | u64 profile = btrfs_get_alloc_profile(root, 0); |
3511 | u64 avail; | |
3512 | ||
3513 | spin_lock(&root->fs_info->free_chunk_lock); | |
3514 | avail = root->fs_info->free_chunk_space; | |
3515 | ||
3516 | /* | |
3517 | * If we have dup, raid1 or raid10 then only half of the free | |
3518 | * space is actually useable. | |
3519 | */ | |
3520 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3521 | BTRFS_BLOCK_GROUP_RAID1 | | |
3522 | BTRFS_BLOCK_GROUP_RAID10)) | |
3523 | avail >>= 1; | |
3524 | ||
3525 | /* | |
3526 | * If we aren't flushing don't let us overcommit too much, say | |
3527 | * 1/8th of the space. If we can flush, let it overcommit up to | |
3528 | * 1/2 of the space. | |
3529 | */ | |
3530 | if (flush) | |
3531 | avail >>= 3; | |
3532 | else | |
3533 | avail >>= 1; | |
3534 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3535 | ||
9a82ca65 | 3536 | if (used + num_bytes < space_info->total_bytes + avail) { |
2bf64758 JB |
3537 | space_info->bytes_may_use += orig_bytes; |
3538 | ret = 0; | |
f104d044 JB |
3539 | } else { |
3540 | wait_ordered = true; | |
2bf64758 JB |
3541 | } |
3542 | } | |
3543 | ||
8bb8ab2e JB |
3544 | /* |
3545 | * Couldn't make our reservation, save our place so while we're trying | |
3546 | * to reclaim space we can actually use it instead of somebody else | |
3547 | * stealing it from us. | |
3548 | */ | |
fdb5effd JB |
3549 | if (ret && flush) { |
3550 | flushing = true; | |
3551 | space_info->flush = 1; | |
8bb8ab2e | 3552 | } |
9ed74f2d | 3553 | |
f0486c68 | 3554 | spin_unlock(&space_info->lock); |
9ed74f2d | 3555 | |
fdb5effd | 3556 | if (!ret || !flush) |
8bb8ab2e | 3557 | goto out; |
f0486c68 | 3558 | |
8bb8ab2e JB |
3559 | /* |
3560 | * We do synchronous shrinking since we don't actually unreserve | |
3561 | * metadata until after the IO is completed. | |
3562 | */ | |
f104d044 | 3563 | ret = shrink_delalloc(trans, root, num_bytes, wait_ordered); |
fdb5effd | 3564 | if (ret < 0) |
8bb8ab2e | 3565 | goto out; |
f0486c68 | 3566 | |
75c195a2 CM |
3567 | ret = 0; |
3568 | ||
8bb8ab2e JB |
3569 | /* |
3570 | * So if we were overcommitted it's possible that somebody else flushed | |
3571 | * out enough space and we simply didn't have enough space to reclaim, | |
3572 | * so go back around and try again. | |
3573 | */ | |
3574 | if (retries < 2) { | |
f104d044 | 3575 | wait_ordered = true; |
8bb8ab2e JB |
3576 | retries++; |
3577 | goto again; | |
3578 | } | |
f0486c68 | 3579 | |
8bb8ab2e | 3580 | ret = -EAGAIN; |
75c195a2 | 3581 | if (trans) |
8bb8ab2e | 3582 | goto out; |
f0486c68 | 3583 | |
8bb8ab2e | 3584 | ret = -ENOSPC; |
75c195a2 CM |
3585 | if (committed) |
3586 | goto out; | |
3587 | ||
7a7eaa40 | 3588 | trans = btrfs_join_transaction(root); |
8bb8ab2e JB |
3589 | if (IS_ERR(trans)) |
3590 | goto out; | |
3591 | ret = btrfs_commit_transaction(trans, root); | |
38227933 JB |
3592 | if (!ret) { |
3593 | trans = NULL; | |
3594 | committed = true; | |
8bb8ab2e | 3595 | goto again; |
38227933 | 3596 | } |
8bb8ab2e JB |
3597 | |
3598 | out: | |
fdb5effd | 3599 | if (flushing) { |
8bb8ab2e | 3600 | spin_lock(&space_info->lock); |
fdb5effd JB |
3601 | space_info->flush = 0; |
3602 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 3603 | spin_unlock(&space_info->lock); |
f0486c68 | 3604 | } |
f0486c68 YZ |
3605 | return ret; |
3606 | } | |
3607 | ||
3608 | static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, | |
3609 | struct btrfs_root *root) | |
3610 | { | |
4c13d758 JB |
3611 | struct btrfs_block_rsv *block_rsv = NULL; |
3612 | ||
3613 | if (root->ref_cows || root == root->fs_info->csum_root) | |
f0486c68 | 3614 | block_rsv = trans->block_rsv; |
4c13d758 JB |
3615 | |
3616 | if (!block_rsv) | |
f0486c68 YZ |
3617 | block_rsv = root->block_rsv; |
3618 | ||
3619 | if (!block_rsv) | |
3620 | block_rsv = &root->fs_info->empty_block_rsv; | |
3621 | ||
3622 | return block_rsv; | |
3623 | } | |
3624 | ||
3625 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
3626 | u64 num_bytes) | |
3627 | { | |
3628 | int ret = -ENOSPC; | |
3629 | spin_lock(&block_rsv->lock); | |
3630 | if (block_rsv->reserved >= num_bytes) { | |
3631 | block_rsv->reserved -= num_bytes; | |
3632 | if (block_rsv->reserved < block_rsv->size) | |
3633 | block_rsv->full = 0; | |
3634 | ret = 0; | |
3635 | } | |
3636 | spin_unlock(&block_rsv->lock); | |
3637 | return ret; | |
3638 | } | |
3639 | ||
3640 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
3641 | u64 num_bytes, int update_size) | |
3642 | { | |
3643 | spin_lock(&block_rsv->lock); | |
3644 | block_rsv->reserved += num_bytes; | |
3645 | if (update_size) | |
3646 | block_rsv->size += num_bytes; | |
3647 | else if (block_rsv->reserved >= block_rsv->size) | |
3648 | block_rsv->full = 1; | |
3649 | spin_unlock(&block_rsv->lock); | |
3650 | } | |
3651 | ||
62a45b60 DS |
3652 | static void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, |
3653 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
f0486c68 YZ |
3654 | { |
3655 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
3656 | ||
3657 | spin_lock(&block_rsv->lock); | |
3658 | if (num_bytes == (u64)-1) | |
3659 | num_bytes = block_rsv->size; | |
3660 | block_rsv->size -= num_bytes; | |
3661 | if (block_rsv->reserved >= block_rsv->size) { | |
3662 | num_bytes = block_rsv->reserved - block_rsv->size; | |
3663 | block_rsv->reserved = block_rsv->size; | |
3664 | block_rsv->full = 1; | |
3665 | } else { | |
3666 | num_bytes = 0; | |
3667 | } | |
3668 | spin_unlock(&block_rsv->lock); | |
3669 | ||
3670 | if (num_bytes > 0) { | |
3671 | if (dest) { | |
e9e22899 JB |
3672 | spin_lock(&dest->lock); |
3673 | if (!dest->full) { | |
3674 | u64 bytes_to_add; | |
3675 | ||
3676 | bytes_to_add = dest->size - dest->reserved; | |
3677 | bytes_to_add = min(num_bytes, bytes_to_add); | |
3678 | dest->reserved += bytes_to_add; | |
3679 | if (dest->reserved >= dest->size) | |
3680 | dest->full = 1; | |
3681 | num_bytes -= bytes_to_add; | |
3682 | } | |
3683 | spin_unlock(&dest->lock); | |
3684 | } | |
3685 | if (num_bytes) { | |
f0486c68 | 3686 | spin_lock(&space_info->lock); |
fb25e914 | 3687 | space_info->bytes_may_use -= num_bytes; |
36e39c40 | 3688 | space_info->reservation_progress++; |
f0486c68 | 3689 | spin_unlock(&space_info->lock); |
4e06bdd6 | 3690 | } |
9ed74f2d | 3691 | } |
f0486c68 | 3692 | } |
4e06bdd6 | 3693 | |
f0486c68 YZ |
3694 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
3695 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
3696 | { | |
3697 | int ret; | |
9ed74f2d | 3698 | |
f0486c68 YZ |
3699 | ret = block_rsv_use_bytes(src, num_bytes); |
3700 | if (ret) | |
3701 | return ret; | |
9ed74f2d | 3702 | |
f0486c68 | 3703 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
3704 | return 0; |
3705 | } | |
3706 | ||
f0486c68 | 3707 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) |
9ed74f2d | 3708 | { |
f0486c68 YZ |
3709 | memset(rsv, 0, sizeof(*rsv)); |
3710 | spin_lock_init(&rsv->lock); | |
f0486c68 YZ |
3711 | } |
3712 | ||
3713 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) | |
3714 | { | |
3715 | struct btrfs_block_rsv *block_rsv; | |
3716 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 3717 | |
f0486c68 YZ |
3718 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
3719 | if (!block_rsv) | |
3720 | return NULL; | |
9ed74f2d | 3721 | |
f0486c68 | 3722 | btrfs_init_block_rsv(block_rsv); |
f0486c68 YZ |
3723 | block_rsv->space_info = __find_space_info(fs_info, |
3724 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
3725 | return block_rsv; |
3726 | } | |
9ed74f2d | 3727 | |
f0486c68 YZ |
3728 | void btrfs_free_block_rsv(struct btrfs_root *root, |
3729 | struct btrfs_block_rsv *rsv) | |
3730 | { | |
dabdb640 JB |
3731 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
3732 | kfree(rsv); | |
9ed74f2d JB |
3733 | } |
3734 | ||
4a92b1b8 | 3735 | int btrfs_block_rsv_add(struct btrfs_root *root, |
f0486c68 | 3736 | struct btrfs_block_rsv *block_rsv, |
8bb8ab2e | 3737 | u64 num_bytes) |
f0486c68 YZ |
3738 | { |
3739 | int ret; | |
9ed74f2d | 3740 | |
f0486c68 YZ |
3741 | if (num_bytes == 0) |
3742 | return 0; | |
8bb8ab2e | 3743 | |
36ba022a | 3744 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1); |
f0486c68 YZ |
3745 | if (!ret) { |
3746 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
3747 | return 0; | |
3748 | } | |
9ed74f2d | 3749 | |
f0486c68 YZ |
3750 | return ret; |
3751 | } | |
9ed74f2d | 3752 | |
4a92b1b8 | 3753 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 3754 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
3755 | { |
3756 | u64 num_bytes = 0; | |
f0486c68 | 3757 | int ret = -ENOSPC; |
9ed74f2d | 3758 | |
f0486c68 YZ |
3759 | if (!block_rsv) |
3760 | return 0; | |
9ed74f2d | 3761 | |
f0486c68 | 3762 | spin_lock(&block_rsv->lock); |
36ba022a JB |
3763 | num_bytes = div_factor(block_rsv->size, min_factor); |
3764 | if (block_rsv->reserved >= num_bytes) | |
3765 | ret = 0; | |
3766 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 3767 | |
36ba022a JB |
3768 | return ret; |
3769 | } | |
3770 | ||
3771 | int btrfs_block_rsv_refill(struct btrfs_root *root, | |
3772 | struct btrfs_block_rsv *block_rsv, | |
3773 | u64 min_reserved) | |
3774 | { | |
3775 | u64 num_bytes = 0; | |
3776 | int ret = -ENOSPC; | |
3777 | ||
3778 | if (!block_rsv) | |
3779 | return 0; | |
3780 | ||
3781 | spin_lock(&block_rsv->lock); | |
3782 | num_bytes = min_reserved; | |
13553e52 | 3783 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 3784 | ret = 0; |
13553e52 | 3785 | else |
f0486c68 | 3786 | num_bytes -= block_rsv->reserved; |
f0486c68 | 3787 | spin_unlock(&block_rsv->lock); |
13553e52 | 3788 | |
f0486c68 YZ |
3789 | if (!ret) |
3790 | return 0; | |
3791 | ||
36ba022a | 3792 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, 1); |
dabdb640 JB |
3793 | if (!ret) { |
3794 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
3795 | return 0; | |
f0486c68 | 3796 | } |
9ed74f2d | 3797 | |
13553e52 | 3798 | return ret; |
f0486c68 YZ |
3799 | } |
3800 | ||
3801 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
3802 | struct btrfs_block_rsv *dst_rsv, | |
3803 | u64 num_bytes) | |
3804 | { | |
3805 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
3806 | } | |
3807 | ||
3808 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
3809 | struct btrfs_block_rsv *block_rsv, | |
3810 | u64 num_bytes) | |
3811 | { | |
3812 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
3813 | if (global_rsv->full || global_rsv == block_rsv || | |
3814 | block_rsv->space_info != global_rsv->space_info) | |
3815 | global_rsv = NULL; | |
3816 | block_rsv_release_bytes(block_rsv, global_rsv, num_bytes); | |
6a63209f JB |
3817 | } |
3818 | ||
3819 | /* | |
8929ecfa YZ |
3820 | * helper to calculate size of global block reservation. |
3821 | * the desired value is sum of space used by extent tree, | |
3822 | * checksum tree and root tree | |
6a63209f | 3823 | */ |
8929ecfa | 3824 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 3825 | { |
8929ecfa YZ |
3826 | struct btrfs_space_info *sinfo; |
3827 | u64 num_bytes; | |
3828 | u64 meta_used; | |
3829 | u64 data_used; | |
3830 | int csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
6a63209f | 3831 | |
8929ecfa YZ |
3832 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
3833 | spin_lock(&sinfo->lock); | |
3834 | data_used = sinfo->bytes_used; | |
3835 | spin_unlock(&sinfo->lock); | |
33b4d47f | 3836 | |
8929ecfa YZ |
3837 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
3838 | spin_lock(&sinfo->lock); | |
6d48755d JB |
3839 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
3840 | data_used = 0; | |
8929ecfa YZ |
3841 | meta_used = sinfo->bytes_used; |
3842 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 3843 | |
8929ecfa YZ |
3844 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
3845 | csum_size * 2; | |
3846 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 3847 | |
8929ecfa YZ |
3848 | if (num_bytes * 3 > meta_used) |
3849 | num_bytes = div64_u64(meta_used, 3); | |
ab6e2410 | 3850 | |
8929ecfa YZ |
3851 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
3852 | } | |
6a63209f | 3853 | |
8929ecfa YZ |
3854 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
3855 | { | |
3856 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
3857 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
3858 | u64 num_bytes; | |
6a63209f | 3859 | |
8929ecfa | 3860 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 3861 | |
8929ecfa YZ |
3862 | spin_lock(&block_rsv->lock); |
3863 | spin_lock(&sinfo->lock); | |
4e06bdd6 | 3864 | |
8929ecfa | 3865 | block_rsv->size = num_bytes; |
4e06bdd6 | 3866 | |
8929ecfa | 3867 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
3868 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
3869 | sinfo->bytes_may_use; | |
8929ecfa YZ |
3870 | |
3871 | if (sinfo->total_bytes > num_bytes) { | |
3872 | num_bytes = sinfo->total_bytes - num_bytes; | |
3873 | block_rsv->reserved += num_bytes; | |
fb25e914 | 3874 | sinfo->bytes_may_use += num_bytes; |
6a63209f | 3875 | } |
6a63209f | 3876 | |
8929ecfa YZ |
3877 | if (block_rsv->reserved >= block_rsv->size) { |
3878 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 3879 | sinfo->bytes_may_use -= num_bytes; |
36e39c40 | 3880 | sinfo->reservation_progress++; |
8929ecfa YZ |
3881 | block_rsv->reserved = block_rsv->size; |
3882 | block_rsv->full = 1; | |
3883 | } | |
182608c8 | 3884 | |
8929ecfa YZ |
3885 | spin_unlock(&sinfo->lock); |
3886 | spin_unlock(&block_rsv->lock); | |
6a63209f JB |
3887 | } |
3888 | ||
f0486c68 | 3889 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3890 | { |
f0486c68 | 3891 | struct btrfs_space_info *space_info; |
6a63209f | 3892 | |
f0486c68 YZ |
3893 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
3894 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 3895 | |
f0486c68 | 3896 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 3897 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 3898 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
3899 | fs_info->trans_block_rsv.space_info = space_info; |
3900 | fs_info->empty_block_rsv.space_info = space_info; | |
f0486c68 | 3901 | |
8929ecfa YZ |
3902 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
3903 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
3904 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
3905 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 3906 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 3907 | |
8929ecfa | 3908 | update_global_block_rsv(fs_info); |
6a63209f JB |
3909 | } |
3910 | ||
8929ecfa | 3911 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 3912 | { |
8929ecfa YZ |
3913 | block_rsv_release_bytes(&fs_info->global_block_rsv, NULL, (u64)-1); |
3914 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
3915 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
3916 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
3917 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
3918 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
3919 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
f0486c68 | 3920 | } |
6a63209f | 3921 | |
a22285a6 YZ |
3922 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
3923 | struct btrfs_root *root) | |
6a63209f | 3924 | { |
a22285a6 YZ |
3925 | if (!trans->bytes_reserved) |
3926 | return; | |
6a63209f | 3927 | |
b24e03db | 3928 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
3929 | trans->bytes_reserved = 0; |
3930 | } | |
6a63209f | 3931 | |
d68fc57b YZ |
3932 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
3933 | struct inode *inode) | |
3934 | { | |
3935 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3936 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3937 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
3938 | ||
3939 | /* | |
fcb80c2a JB |
3940 | * We need to hold space in order to delete our orphan item once we've |
3941 | * added it, so this takes the reservation so we can release it later | |
3942 | * when we are truly done with the orphan item. | |
d68fc57b | 3943 | */ |
ff5714cc | 3944 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b | 3945 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
3946 | } |
3947 | ||
d68fc57b | 3948 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 3949 | { |
d68fc57b | 3950 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 3951 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
d68fc57b YZ |
3952 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
3953 | } | |
97e728d4 | 3954 | |
a22285a6 YZ |
3955 | int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
3956 | struct btrfs_pending_snapshot *pending) | |
3957 | { | |
3958 | struct btrfs_root *root = pending->root; | |
3959 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
3960 | struct btrfs_block_rsv *dst_rsv = &pending->block_rsv; | |
3961 | /* | |
3962 | * two for root back/forward refs, two for directory entries | |
3963 | * and one for root of the snapshot. | |
3964 | */ | |
16cdcec7 | 3965 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5); |
a22285a6 YZ |
3966 | dst_rsv->space_info = src_rsv->space_info; |
3967 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
97e728d4 JB |
3968 | } |
3969 | ||
7709cde3 JB |
3970 | /** |
3971 | * drop_outstanding_extent - drop an outstanding extent | |
3972 | * @inode: the inode we're dropping the extent for | |
3973 | * | |
3974 | * This is called when we are freeing up an outstanding extent, either called | |
3975 | * after an error or after an extent is written. This will return the number of | |
3976 | * reserved extents that need to be freed. This must be called with | |
3977 | * BTRFS_I(inode)->lock held. | |
3978 | */ | |
9e0baf60 JB |
3979 | static unsigned drop_outstanding_extent(struct inode *inode) |
3980 | { | |
3981 | unsigned dropped_extents = 0; | |
3982 | ||
9e0baf60 JB |
3983 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
3984 | BTRFS_I(inode)->outstanding_extents--; | |
3985 | ||
3986 | /* | |
3987 | * If we have more or the same amount of outsanding extents than we have | |
3988 | * reserved then we need to leave the reserved extents count alone. | |
3989 | */ | |
3990 | if (BTRFS_I(inode)->outstanding_extents >= | |
3991 | BTRFS_I(inode)->reserved_extents) | |
7709cde3 | 3992 | return 0; |
9e0baf60 JB |
3993 | |
3994 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
3995 | BTRFS_I(inode)->outstanding_extents; | |
3996 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
9e0baf60 JB |
3997 | return dropped_extents; |
3998 | } | |
3999 | ||
7709cde3 JB |
4000 | /** |
4001 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4002 | * reserved/free'd for the given bytes. | |
4003 | * @inode: the inode we're manipulating | |
4004 | * @num_bytes: the number of bytes in question | |
4005 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4006 | * | |
4007 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4008 | * correct amount of metadata that must either be reserved or freed. We | |
4009 | * calculate how many checksums we can fit into one leaf and then divide the | |
4010 | * number of bytes that will need to be checksumed by this value to figure out | |
4011 | * how many checksums will be required. If we are adding bytes then the number | |
4012 | * may go up and we will return the number of additional bytes that must be | |
4013 | * reserved. If it is going down we will return the number of bytes that must | |
4014 | * be freed. | |
4015 | * | |
4016 | * This must be called with BTRFS_I(inode)->lock held. | |
4017 | */ | |
4018 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4019 | int reserve) | |
6324fbf3 | 4020 | { |
7709cde3 JB |
4021 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4022 | u64 csum_size; | |
4023 | int num_csums_per_leaf; | |
4024 | int num_csums; | |
4025 | int old_csums; | |
4026 | ||
4027 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4028 | BTRFS_I(inode)->csum_bytes == 0) | |
4029 | return 0; | |
4030 | ||
4031 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4032 | if (reserve) | |
4033 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4034 | else | |
4035 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4036 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4037 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4038 | sizeof(struct btrfs_csum_item) + | |
4039 | sizeof(struct btrfs_disk_key)); | |
4040 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4041 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4042 | num_csums = num_csums / num_csums_per_leaf; | |
4043 | ||
4044 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4045 | old_csums = old_csums / num_csums_per_leaf; | |
4046 | ||
4047 | /* No change, no need to reserve more */ | |
4048 | if (old_csums == num_csums) | |
4049 | return 0; | |
4050 | ||
4051 | if (reserve) | |
4052 | return btrfs_calc_trans_metadata_size(root, | |
4053 | num_csums - old_csums); | |
4054 | ||
4055 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4056 | } |
c146afad | 4057 | |
0ca1f7ce YZ |
4058 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4059 | { | |
4060 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4061 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 JB |
4062 | u64 to_reserve = 0; |
4063 | unsigned nr_extents = 0; | |
c09544e0 | 4064 | int flush = 1; |
0ca1f7ce | 4065 | int ret; |
6324fbf3 | 4066 | |
c09544e0 JB |
4067 | if (btrfs_is_free_space_inode(root, inode)) |
4068 | flush = 0; | |
4069 | ||
4070 | if (flush && btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4071 | schedule_timeout(1); |
ec44a35c | 4072 | |
0ca1f7ce | 4073 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4074 | |
9e0baf60 JB |
4075 | spin_lock(&BTRFS_I(inode)->lock); |
4076 | BTRFS_I(inode)->outstanding_extents++; | |
4077 | ||
4078 | if (BTRFS_I(inode)->outstanding_extents > | |
4079 | BTRFS_I(inode)->reserved_extents) { | |
4080 | nr_extents = BTRFS_I(inode)->outstanding_extents - | |
4081 | BTRFS_I(inode)->reserved_extents; | |
4082 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
57a45ced | 4083 | |
16cdcec7 | 4084 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); |
593060d7 | 4085 | } |
7709cde3 | 4086 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
9e0baf60 | 4087 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4088 | |
36ba022a | 4089 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
9e0baf60 | 4090 | if (ret) { |
7ed49f18 | 4091 | u64 to_free = 0; |
9e0baf60 | 4092 | unsigned dropped; |
7ed49f18 | 4093 | |
7709cde3 | 4094 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4095 | dropped = drop_outstanding_extent(inode); |
7ed49f18 | 4096 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
7709cde3 | 4097 | spin_unlock(&BTRFS_I(inode)->lock); |
7ed49f18 JB |
4098 | to_free += btrfs_calc_trans_metadata_size(root, dropped); |
4099 | ||
4100 | /* | |
4101 | * Somebody could have come in and twiddled with the | |
4102 | * reservation, so if we have to free more than we would have | |
4103 | * reserved from this reservation go ahead and release those | |
4104 | * bytes. | |
4105 | */ | |
4106 | to_free -= to_reserve; | |
4107 | if (to_free) | |
4108 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
0ca1f7ce | 4109 | return ret; |
9e0baf60 | 4110 | } |
25179201 | 4111 | |
0ca1f7ce YZ |
4112 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4113 | ||
0ca1f7ce YZ |
4114 | return 0; |
4115 | } | |
4116 | ||
7709cde3 JB |
4117 | /** |
4118 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
4119 | * @inode: the inode to release the reservation for | |
4120 | * @num_bytes: the number of bytes we're releasing | |
4121 | * | |
4122 | * This will release the metadata reservation for an inode. This can be called | |
4123 | * once we complete IO for a given set of bytes to release their metadata | |
4124 | * reservations. | |
4125 | */ | |
0ca1f7ce YZ |
4126 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
4127 | { | |
4128 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
4129 | u64 to_free = 0; |
4130 | unsigned dropped; | |
0ca1f7ce YZ |
4131 | |
4132 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 4133 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4134 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 4135 | |
7709cde3 JB |
4136 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); |
4137 | spin_unlock(&BTRFS_I(inode)->lock); | |
9e0baf60 JB |
4138 | if (dropped > 0) |
4139 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce YZ |
4140 | |
4141 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
4142 | to_free); | |
4143 | } | |
4144 | ||
7709cde3 JB |
4145 | /** |
4146 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
4147 | * @inode: inode we're writing to | |
4148 | * @num_bytes: the number of bytes we want to allocate | |
4149 | * | |
4150 | * This will do the following things | |
4151 | * | |
4152 | * o reserve space in the data space info for num_bytes | |
4153 | * o reserve space in the metadata space info based on number of outstanding | |
4154 | * extents and how much csums will be needed | |
4155 | * o add to the inodes ->delalloc_bytes | |
4156 | * o add it to the fs_info's delalloc inodes list. | |
4157 | * | |
4158 | * This will return 0 for success and -ENOSPC if there is no space left. | |
4159 | */ | |
0ca1f7ce YZ |
4160 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
4161 | { | |
4162 | int ret; | |
4163 | ||
4164 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4165 | if (ret) |
0ca1f7ce YZ |
4166 | return ret; |
4167 | ||
4168 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4169 | if (ret) { | |
4170 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4171 | return ret; | |
4172 | } | |
4173 | ||
4174 | return 0; | |
4175 | } | |
4176 | ||
7709cde3 JB |
4177 | /** |
4178 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
4179 | * @inode: inode we're releasing space for | |
4180 | * @num_bytes: the number of bytes we want to free up | |
4181 | * | |
4182 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
4183 | * called in the case that we don't need the metadata AND data reservations | |
4184 | * anymore. So if there is an error or we insert an inline extent. | |
4185 | * | |
4186 | * This function will release the metadata space that was not used and will | |
4187 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
4188 | * list if there are no delalloc bytes left. | |
4189 | */ | |
0ca1f7ce YZ |
4190 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
4191 | { | |
4192 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4193 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4194 | } |
4195 | ||
9078a3e1 CM |
4196 | static int update_block_group(struct btrfs_trans_handle *trans, |
4197 | struct btrfs_root *root, | |
f0486c68 | 4198 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4199 | { |
0af3d00b | 4200 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4201 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4202 | u64 total = num_bytes; |
9078a3e1 | 4203 | u64 old_val; |
db94535d | 4204 | u64 byte_in_group; |
0af3d00b | 4205 | int factor; |
3e1ad54f | 4206 | |
5d4f98a2 YZ |
4207 | /* block accounting for super block */ |
4208 | spin_lock(&info->delalloc_lock); | |
4209 | old_val = btrfs_super_bytes_used(&info->super_copy); | |
4210 | if (alloc) | |
4211 | old_val += num_bytes; | |
4212 | else | |
4213 | old_val -= num_bytes; | |
4214 | btrfs_set_super_bytes_used(&info->super_copy, old_val); | |
5d4f98a2 YZ |
4215 | spin_unlock(&info->delalloc_lock); |
4216 | ||
d397712b | 4217 | while (total) { |
db94535d | 4218 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4219 | if (!cache) |
9078a3e1 | 4220 | return -1; |
b742bb82 YZ |
4221 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4222 | BTRFS_BLOCK_GROUP_RAID1 | | |
4223 | BTRFS_BLOCK_GROUP_RAID10)) | |
4224 | factor = 2; | |
4225 | else | |
4226 | factor = 1; | |
9d66e233 JB |
4227 | /* |
4228 | * If this block group has free space cache written out, we | |
4229 | * need to make sure to load it if we are removing space. This | |
4230 | * is because we need the unpinning stage to actually add the | |
4231 | * space back to the block group, otherwise we will leak space. | |
4232 | */ | |
4233 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
b8399dee | 4234 | cache_block_group(cache, trans, NULL, 1); |
0af3d00b | 4235 | |
db94535d CM |
4236 | byte_in_group = bytenr - cache->key.objectid; |
4237 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4238 | |
25179201 | 4239 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4240 | spin_lock(&cache->lock); |
0af3d00b | 4241 | |
73bc1876 | 4242 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
4243 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
4244 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4245 | ||
0f9dd46c | 4246 | cache->dirty = 1; |
9078a3e1 | 4247 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4248 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4249 | if (alloc) { |
db94535d | 4250 | old_val += num_bytes; |
11833d66 YZ |
4251 | btrfs_set_block_group_used(&cache->item, old_val); |
4252 | cache->reserved -= num_bytes; | |
11833d66 | 4253 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
4254 | cache->space_info->bytes_used += num_bytes; |
4255 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 4256 | spin_unlock(&cache->lock); |
25179201 | 4257 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 4258 | } else { |
db94535d | 4259 | old_val -= num_bytes; |
c286ac48 | 4260 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
4261 | cache->pinned += num_bytes; |
4262 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 4263 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 4264 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 4265 | spin_unlock(&cache->lock); |
25179201 | 4266 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 4267 | |
f0486c68 YZ |
4268 | set_extent_dirty(info->pinned_extents, |
4269 | bytenr, bytenr + num_bytes - 1, | |
4270 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 4271 | } |
fa9c0d79 | 4272 | btrfs_put_block_group(cache); |
db94535d CM |
4273 | total -= num_bytes; |
4274 | bytenr += num_bytes; | |
9078a3e1 CM |
4275 | } |
4276 | return 0; | |
4277 | } | |
6324fbf3 | 4278 | |
a061fc8d CM |
4279 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
4280 | { | |
0f9dd46c | 4281 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 4282 | u64 bytenr; |
0f9dd46c JB |
4283 | |
4284 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
4285 | if (!cache) | |
a061fc8d | 4286 | return 0; |
0f9dd46c | 4287 | |
d2fb3437 | 4288 | bytenr = cache->key.objectid; |
fa9c0d79 | 4289 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
4290 | |
4291 | return bytenr; | |
a061fc8d CM |
4292 | } |
4293 | ||
f0486c68 YZ |
4294 | static int pin_down_extent(struct btrfs_root *root, |
4295 | struct btrfs_block_group_cache *cache, | |
4296 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 4297 | { |
11833d66 YZ |
4298 | spin_lock(&cache->space_info->lock); |
4299 | spin_lock(&cache->lock); | |
4300 | cache->pinned += num_bytes; | |
4301 | cache->space_info->bytes_pinned += num_bytes; | |
4302 | if (reserved) { | |
4303 | cache->reserved -= num_bytes; | |
4304 | cache->space_info->bytes_reserved -= num_bytes; | |
4305 | } | |
4306 | spin_unlock(&cache->lock); | |
4307 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 4308 | |
f0486c68 YZ |
4309 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
4310 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
4311 | return 0; | |
4312 | } | |
68b38550 | 4313 | |
f0486c68 YZ |
4314 | /* |
4315 | * this function must be called within transaction | |
4316 | */ | |
4317 | int btrfs_pin_extent(struct btrfs_root *root, | |
4318 | u64 bytenr, u64 num_bytes, int reserved) | |
4319 | { | |
4320 | struct btrfs_block_group_cache *cache; | |
68b38550 | 4321 | |
f0486c68 YZ |
4322 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
4323 | BUG_ON(!cache); | |
4324 | ||
4325 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
4326 | ||
4327 | btrfs_put_block_group(cache); | |
11833d66 YZ |
4328 | return 0; |
4329 | } | |
4330 | ||
fb25e914 JB |
4331 | /** |
4332 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
4333 | * @cache: The cache we are manipulating | |
4334 | * @num_bytes: The number of bytes in question | |
4335 | * @reserve: One of the reservation enums | |
4336 | * | |
4337 | * This is called by the allocator when it reserves space, or by somebody who is | |
4338 | * freeing space that was never actually used on disk. For example if you | |
4339 | * reserve some space for a new leaf in transaction A and before transaction A | |
4340 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
4341 | * clear the reservation. | |
4342 | * | |
4343 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
4344 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
4345 | * delalloc bits in the io_tree. We have to do this since we could end up | |
4346 | * allocating less disk space for the amount of data we have reserved in the | |
4347 | * case of compression. | |
4348 | * | |
4349 | * If this is a reservation and the block group has become read only we cannot | |
4350 | * make the reservation and return -EAGAIN, otherwise this function always | |
4351 | * succeeds. | |
f0486c68 | 4352 | */ |
fb25e914 JB |
4353 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
4354 | u64 num_bytes, int reserve) | |
11833d66 | 4355 | { |
fb25e914 | 4356 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 4357 | int ret = 0; |
fb25e914 JB |
4358 | spin_lock(&space_info->lock); |
4359 | spin_lock(&cache->lock); | |
4360 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
4361 | if (cache->ro) { |
4362 | ret = -EAGAIN; | |
4363 | } else { | |
fb25e914 JB |
4364 | cache->reserved += num_bytes; |
4365 | space_info->bytes_reserved += num_bytes; | |
4366 | if (reserve == RESERVE_ALLOC) { | |
4367 | BUG_ON(space_info->bytes_may_use < num_bytes); | |
4368 | space_info->bytes_may_use -= num_bytes; | |
4369 | } | |
f0486c68 | 4370 | } |
fb25e914 JB |
4371 | } else { |
4372 | if (cache->ro) | |
4373 | space_info->bytes_readonly += num_bytes; | |
4374 | cache->reserved -= num_bytes; | |
4375 | space_info->bytes_reserved -= num_bytes; | |
4376 | space_info->reservation_progress++; | |
324ae4df | 4377 | } |
fb25e914 JB |
4378 | spin_unlock(&cache->lock); |
4379 | spin_unlock(&space_info->lock); | |
f0486c68 | 4380 | return ret; |
324ae4df | 4381 | } |
9078a3e1 | 4382 | |
11833d66 YZ |
4383 | int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
4384 | struct btrfs_root *root) | |
e8569813 | 4385 | { |
e8569813 | 4386 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
4387 | struct btrfs_caching_control *next; |
4388 | struct btrfs_caching_control *caching_ctl; | |
4389 | struct btrfs_block_group_cache *cache; | |
e8569813 | 4390 | |
11833d66 | 4391 | down_write(&fs_info->extent_commit_sem); |
25179201 | 4392 | |
11833d66 YZ |
4393 | list_for_each_entry_safe(caching_ctl, next, |
4394 | &fs_info->caching_block_groups, list) { | |
4395 | cache = caching_ctl->block_group; | |
4396 | if (block_group_cache_done(cache)) { | |
4397 | cache->last_byte_to_unpin = (u64)-1; | |
4398 | list_del_init(&caching_ctl->list); | |
4399 | put_caching_control(caching_ctl); | |
e8569813 | 4400 | } else { |
11833d66 | 4401 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 4402 | } |
e8569813 | 4403 | } |
11833d66 YZ |
4404 | |
4405 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
4406 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
4407 | else | |
4408 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
4409 | ||
4410 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
4411 | |
4412 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
4413 | return 0; |
4414 | } | |
4415 | ||
11833d66 | 4416 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 4417 | { |
11833d66 YZ |
4418 | struct btrfs_fs_info *fs_info = root->fs_info; |
4419 | struct btrfs_block_group_cache *cache = NULL; | |
4420 | u64 len; | |
ccd467d6 | 4421 | |
11833d66 YZ |
4422 | while (start <= end) { |
4423 | if (!cache || | |
4424 | start >= cache->key.objectid + cache->key.offset) { | |
4425 | if (cache) | |
4426 | btrfs_put_block_group(cache); | |
4427 | cache = btrfs_lookup_block_group(fs_info, start); | |
4428 | BUG_ON(!cache); | |
4429 | } | |
4430 | ||
4431 | len = cache->key.objectid + cache->key.offset - start; | |
4432 | len = min(len, end + 1 - start); | |
4433 | ||
4434 | if (start < cache->last_byte_to_unpin) { | |
4435 | len = min(len, cache->last_byte_to_unpin - start); | |
4436 | btrfs_add_free_space(cache, start, len); | |
4437 | } | |
4438 | ||
f0486c68 YZ |
4439 | start += len; |
4440 | ||
11833d66 YZ |
4441 | spin_lock(&cache->space_info->lock); |
4442 | spin_lock(&cache->lock); | |
4443 | cache->pinned -= len; | |
4444 | cache->space_info->bytes_pinned -= len; | |
37be25bc | 4445 | if (cache->ro) |
f0486c68 | 4446 | cache->space_info->bytes_readonly += len; |
11833d66 YZ |
4447 | spin_unlock(&cache->lock); |
4448 | spin_unlock(&cache->space_info->lock); | |
ccd467d6 | 4449 | } |
11833d66 YZ |
4450 | |
4451 | if (cache) | |
4452 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
4453 | return 0; |
4454 | } | |
4455 | ||
4456 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 4457 | struct btrfs_root *root) |
a28ec197 | 4458 | { |
11833d66 YZ |
4459 | struct btrfs_fs_info *fs_info = root->fs_info; |
4460 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
4461 | u64 start; |
4462 | u64 end; | |
a28ec197 | 4463 | int ret; |
a28ec197 | 4464 | |
11833d66 YZ |
4465 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
4466 | unpin = &fs_info->freed_extents[1]; | |
4467 | else | |
4468 | unpin = &fs_info->freed_extents[0]; | |
4469 | ||
d397712b | 4470 | while (1) { |
1a5bc167 CM |
4471 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
4472 | EXTENT_DIRTY); | |
4473 | if (ret) | |
a28ec197 | 4474 | break; |
1f3c79a2 | 4475 | |
5378e607 LD |
4476 | if (btrfs_test_opt(root, DISCARD)) |
4477 | ret = btrfs_discard_extent(root, start, | |
4478 | end + 1 - start, NULL); | |
1f3c79a2 | 4479 | |
1a5bc167 | 4480 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 4481 | unpin_extent_range(root, start, end); |
b9473439 | 4482 | cond_resched(); |
a28ec197 | 4483 | } |
817d52f8 | 4484 | |
e20d96d6 CM |
4485 | return 0; |
4486 | } | |
4487 | ||
5d4f98a2 YZ |
4488 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
4489 | struct btrfs_root *root, | |
4490 | u64 bytenr, u64 num_bytes, u64 parent, | |
4491 | u64 root_objectid, u64 owner_objectid, | |
4492 | u64 owner_offset, int refs_to_drop, | |
4493 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 4494 | { |
e2fa7227 | 4495 | struct btrfs_key key; |
5d4f98a2 | 4496 | struct btrfs_path *path; |
1261ec42 CM |
4497 | struct btrfs_fs_info *info = root->fs_info; |
4498 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 4499 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
4500 | struct btrfs_extent_item *ei; |
4501 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 4502 | int ret; |
5d4f98a2 | 4503 | int is_data; |
952fccac CM |
4504 | int extent_slot = 0; |
4505 | int found_extent = 0; | |
4506 | int num_to_del = 1; | |
5d4f98a2 YZ |
4507 | u32 item_size; |
4508 | u64 refs; | |
037e6390 | 4509 | |
5caf2a00 | 4510 | path = btrfs_alloc_path(); |
54aa1f4d CM |
4511 | if (!path) |
4512 | return -ENOMEM; | |
5f26f772 | 4513 | |
3c12ac72 | 4514 | path->reada = 1; |
b9473439 | 4515 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4516 | |
4517 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
4518 | BUG_ON(!is_data && refs_to_drop != 1); | |
4519 | ||
4520 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
4521 | bytenr, num_bytes, parent, | |
4522 | root_objectid, owner_objectid, | |
4523 | owner_offset); | |
7bb86316 | 4524 | if (ret == 0) { |
952fccac | 4525 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
4526 | while (extent_slot >= 0) { |
4527 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 4528 | extent_slot); |
5d4f98a2 | 4529 | if (key.objectid != bytenr) |
952fccac | 4530 | break; |
5d4f98a2 YZ |
4531 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
4532 | key.offset == num_bytes) { | |
952fccac CM |
4533 | found_extent = 1; |
4534 | break; | |
4535 | } | |
4536 | if (path->slots[0] - extent_slot > 5) | |
4537 | break; | |
5d4f98a2 | 4538 | extent_slot--; |
952fccac | 4539 | } |
5d4f98a2 YZ |
4540 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
4541 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
4542 | if (found_extent && item_size < sizeof(*ei)) | |
4543 | found_extent = 0; | |
4544 | #endif | |
31840ae1 | 4545 | if (!found_extent) { |
5d4f98a2 | 4546 | BUG_ON(iref); |
56bec294 | 4547 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
4548 | NULL, refs_to_drop, |
4549 | is_data); | |
31840ae1 | 4550 | BUG_ON(ret); |
b3b4aa74 | 4551 | btrfs_release_path(path); |
b9473439 | 4552 | path->leave_spinning = 1; |
5d4f98a2 YZ |
4553 | |
4554 | key.objectid = bytenr; | |
4555 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4556 | key.offset = num_bytes; | |
4557 | ||
31840ae1 ZY |
4558 | ret = btrfs_search_slot(trans, extent_root, |
4559 | &key, path, -1, 1); | |
f3465ca4 JB |
4560 | if (ret) { |
4561 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
4562 | ", was looking for %llu\n", ret, |
4563 | (unsigned long long)bytenr); | |
b783e62d JB |
4564 | if (ret > 0) |
4565 | btrfs_print_leaf(extent_root, | |
4566 | path->nodes[0]); | |
f3465ca4 | 4567 | } |
31840ae1 ZY |
4568 | BUG_ON(ret); |
4569 | extent_slot = path->slots[0]; | |
4570 | } | |
7bb86316 CM |
4571 | } else { |
4572 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4573 | WARN_ON(1); | |
d397712b | 4574 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 4575 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 4576 | (unsigned long long)bytenr, |
56bec294 | 4577 | (unsigned long long)parent, |
d397712b | 4578 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
4579 | (unsigned long long)owner_objectid, |
4580 | (unsigned long long)owner_offset); | |
7bb86316 | 4581 | } |
5f39d397 CM |
4582 | |
4583 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
4584 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
4585 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
4586 | if (item_size < sizeof(*ei)) { | |
4587 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
4588 | ret = convert_extent_item_v0(trans, extent_root, path, | |
4589 | owner_objectid, 0); | |
4590 | BUG_ON(ret < 0); | |
4591 | ||
b3b4aa74 | 4592 | btrfs_release_path(path); |
5d4f98a2 YZ |
4593 | path->leave_spinning = 1; |
4594 | ||
4595 | key.objectid = bytenr; | |
4596 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
4597 | key.offset = num_bytes; | |
4598 | ||
4599 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
4600 | -1, 1); | |
4601 | if (ret) { | |
4602 | printk(KERN_ERR "umm, got %d back from search" | |
4603 | ", was looking for %llu\n", ret, | |
4604 | (unsigned long long)bytenr); | |
4605 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
4606 | } | |
4607 | BUG_ON(ret); | |
4608 | extent_slot = path->slots[0]; | |
4609 | leaf = path->nodes[0]; | |
4610 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
4611 | } | |
4612 | #endif | |
4613 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 4614 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 4615 | struct btrfs_extent_item); |
5d4f98a2 YZ |
4616 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
4617 | struct btrfs_tree_block_info *bi; | |
4618 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
4619 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
4620 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
4621 | } | |
56bec294 | 4622 | |
5d4f98a2 | 4623 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
4624 | BUG_ON(refs < refs_to_drop); |
4625 | refs -= refs_to_drop; | |
5f39d397 | 4626 | |
5d4f98a2 YZ |
4627 | if (refs > 0) { |
4628 | if (extent_op) | |
4629 | __run_delayed_extent_op(extent_op, leaf, ei); | |
4630 | /* | |
4631 | * In the case of inline back ref, reference count will | |
4632 | * be updated by remove_extent_backref | |
952fccac | 4633 | */ |
5d4f98a2 YZ |
4634 | if (iref) { |
4635 | BUG_ON(!found_extent); | |
4636 | } else { | |
4637 | btrfs_set_extent_refs(leaf, ei, refs); | |
4638 | btrfs_mark_buffer_dirty(leaf); | |
4639 | } | |
4640 | if (found_extent) { | |
4641 | ret = remove_extent_backref(trans, extent_root, path, | |
4642 | iref, refs_to_drop, | |
4643 | is_data); | |
952fccac CM |
4644 | BUG_ON(ret); |
4645 | } | |
5d4f98a2 | 4646 | } else { |
5d4f98a2 YZ |
4647 | if (found_extent) { |
4648 | BUG_ON(is_data && refs_to_drop != | |
4649 | extent_data_ref_count(root, path, iref)); | |
4650 | if (iref) { | |
4651 | BUG_ON(path->slots[0] != extent_slot); | |
4652 | } else { | |
4653 | BUG_ON(path->slots[0] != extent_slot + 1); | |
4654 | path->slots[0] = extent_slot; | |
4655 | num_to_del = 2; | |
4656 | } | |
78fae27e | 4657 | } |
b9473439 | 4658 | |
952fccac CM |
4659 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
4660 | num_to_del); | |
31840ae1 | 4661 | BUG_ON(ret); |
b3b4aa74 | 4662 | btrfs_release_path(path); |
21af804c | 4663 | |
5d4f98a2 | 4664 | if (is_data) { |
459931ec CM |
4665 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
4666 | BUG_ON(ret); | |
d57e62b8 CM |
4667 | } else { |
4668 | invalidate_mapping_pages(info->btree_inode->i_mapping, | |
4669 | bytenr >> PAGE_CACHE_SHIFT, | |
4670 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); | |
459931ec CM |
4671 | } |
4672 | ||
f0486c68 | 4673 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); |
dcbdd4dc | 4674 | BUG_ON(ret); |
a28ec197 | 4675 | } |
5caf2a00 | 4676 | btrfs_free_path(path); |
a28ec197 CM |
4677 | return ret; |
4678 | } | |
4679 | ||
1887be66 | 4680 | /* |
f0486c68 | 4681 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
4682 | * delayed ref for that extent as well. This searches the delayed ref tree for |
4683 | * a given extent, and if there are no other delayed refs to be processed, it | |
4684 | * removes it from the tree. | |
4685 | */ | |
4686 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
4687 | struct btrfs_root *root, u64 bytenr) | |
4688 | { | |
4689 | struct btrfs_delayed_ref_head *head; | |
4690 | struct btrfs_delayed_ref_root *delayed_refs; | |
4691 | struct btrfs_delayed_ref_node *ref; | |
4692 | struct rb_node *node; | |
f0486c68 | 4693 | int ret = 0; |
1887be66 CM |
4694 | |
4695 | delayed_refs = &trans->transaction->delayed_refs; | |
4696 | spin_lock(&delayed_refs->lock); | |
4697 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
4698 | if (!head) | |
4699 | goto out; | |
4700 | ||
4701 | node = rb_prev(&head->node.rb_node); | |
4702 | if (!node) | |
4703 | goto out; | |
4704 | ||
4705 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
4706 | ||
4707 | /* there are still entries for this ref, we can't drop it */ | |
4708 | if (ref->bytenr == bytenr) | |
4709 | goto out; | |
4710 | ||
5d4f98a2 YZ |
4711 | if (head->extent_op) { |
4712 | if (!head->must_insert_reserved) | |
4713 | goto out; | |
4714 | kfree(head->extent_op); | |
4715 | head->extent_op = NULL; | |
4716 | } | |
4717 | ||
1887be66 CM |
4718 | /* |
4719 | * waiting for the lock here would deadlock. If someone else has it | |
4720 | * locked they are already in the process of dropping it anyway | |
4721 | */ | |
4722 | if (!mutex_trylock(&head->mutex)) | |
4723 | goto out; | |
4724 | ||
4725 | /* | |
4726 | * at this point we have a head with no other entries. Go | |
4727 | * ahead and process it. | |
4728 | */ | |
4729 | head->node.in_tree = 0; | |
4730 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 4731 | |
1887be66 CM |
4732 | delayed_refs->num_entries--; |
4733 | ||
4734 | /* | |
4735 | * we don't take a ref on the node because we're removing it from the | |
4736 | * tree, so we just steal the ref the tree was holding. | |
4737 | */ | |
c3e69d58 CM |
4738 | delayed_refs->num_heads--; |
4739 | if (list_empty(&head->cluster)) | |
4740 | delayed_refs->num_heads_ready--; | |
4741 | ||
4742 | list_del_init(&head->cluster); | |
1887be66 CM |
4743 | spin_unlock(&delayed_refs->lock); |
4744 | ||
f0486c68 YZ |
4745 | BUG_ON(head->extent_op); |
4746 | if (head->must_insert_reserved) | |
4747 | ret = 1; | |
4748 | ||
4749 | mutex_unlock(&head->mutex); | |
1887be66 | 4750 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 4751 | return ret; |
1887be66 CM |
4752 | out: |
4753 | spin_unlock(&delayed_refs->lock); | |
4754 | return 0; | |
4755 | } | |
4756 | ||
f0486c68 YZ |
4757 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
4758 | struct btrfs_root *root, | |
4759 | struct extent_buffer *buf, | |
4760 | u64 parent, int last_ref) | |
4761 | { | |
f0486c68 YZ |
4762 | struct btrfs_block_group_cache *cache = NULL; |
4763 | int ret; | |
4764 | ||
4765 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4766 | ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, | |
4767 | parent, root->root_key.objectid, | |
4768 | btrfs_header_level(buf), | |
4769 | BTRFS_DROP_DELAYED_REF, NULL); | |
4770 | BUG_ON(ret); | |
4771 | } | |
4772 | ||
4773 | if (!last_ref) | |
4774 | return; | |
4775 | ||
f0486c68 | 4776 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
4777 | |
4778 | if (btrfs_header_generation(buf) == trans->transid) { | |
4779 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
4780 | ret = check_ref_cleanup(trans, root, buf->start); | |
4781 | if (!ret) | |
37be25bc | 4782 | goto out; |
f0486c68 YZ |
4783 | } |
4784 | ||
4785 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
4786 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 4787 | goto out; |
f0486c68 YZ |
4788 | } |
4789 | ||
4790 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
4791 | ||
4792 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 4793 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
f0486c68 YZ |
4794 | } |
4795 | out: | |
a826d6dc JB |
4796 | /* |
4797 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
4798 | * anymore. | |
4799 | */ | |
4800 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
4801 | btrfs_put_block_group(cache); |
4802 | } | |
4803 | ||
925baedd | 4804 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
31840ae1 ZY |
4805 | struct btrfs_root *root, |
4806 | u64 bytenr, u64 num_bytes, u64 parent, | |
5d4f98a2 | 4807 | u64 root_objectid, u64 owner, u64 offset) |
925baedd CM |
4808 | { |
4809 | int ret; | |
4810 | ||
56bec294 CM |
4811 | /* |
4812 | * tree log blocks never actually go into the extent allocation | |
4813 | * tree, just update pinning info and exit early. | |
56bec294 | 4814 | */ |
5d4f98a2 YZ |
4815 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
4816 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 4817 | /* unlocks the pinned mutex */ |
11833d66 | 4818 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 4819 | ret = 0; |
5d4f98a2 YZ |
4820 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
4821 | ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, | |
4822 | parent, root_objectid, (int)owner, | |
4823 | BTRFS_DROP_DELAYED_REF, NULL); | |
1887be66 | 4824 | BUG_ON(ret); |
5d4f98a2 YZ |
4825 | } else { |
4826 | ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, | |
4827 | parent, root_objectid, owner, | |
4828 | offset, BTRFS_DROP_DELAYED_REF, NULL); | |
4829 | BUG_ON(ret); | |
56bec294 | 4830 | } |
925baedd CM |
4831 | return ret; |
4832 | } | |
4833 | ||
87ee04eb CM |
4834 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
4835 | { | |
4836 | u64 mask = ((u64)root->stripesize - 1); | |
4837 | u64 ret = (val + mask) & ~mask; | |
4838 | return ret; | |
4839 | } | |
4840 | ||
817d52f8 JB |
4841 | /* |
4842 | * when we wait for progress in the block group caching, its because | |
4843 | * our allocation attempt failed at least once. So, we must sleep | |
4844 | * and let some progress happen before we try again. | |
4845 | * | |
4846 | * This function will sleep at least once waiting for new free space to | |
4847 | * show up, and then it will check the block group free space numbers | |
4848 | * for our min num_bytes. Another option is to have it go ahead | |
4849 | * and look in the rbtree for a free extent of a given size, but this | |
4850 | * is a good start. | |
4851 | */ | |
4852 | static noinline int | |
4853 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
4854 | u64 num_bytes) | |
4855 | { | |
11833d66 | 4856 | struct btrfs_caching_control *caching_ctl; |
817d52f8 JB |
4857 | DEFINE_WAIT(wait); |
4858 | ||
11833d66 YZ |
4859 | caching_ctl = get_caching_control(cache); |
4860 | if (!caching_ctl) | |
817d52f8 | 4861 | return 0; |
817d52f8 | 4862 | |
11833d66 | 4863 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 4864 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
4865 | |
4866 | put_caching_control(caching_ctl); | |
4867 | return 0; | |
4868 | } | |
4869 | ||
4870 | static noinline int | |
4871 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
4872 | { | |
4873 | struct btrfs_caching_control *caching_ctl; | |
4874 | DEFINE_WAIT(wait); | |
4875 | ||
4876 | caching_ctl = get_caching_control(cache); | |
4877 | if (!caching_ctl) | |
4878 | return 0; | |
4879 | ||
4880 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
4881 | ||
4882 | put_caching_control(caching_ctl); | |
817d52f8 JB |
4883 | return 0; |
4884 | } | |
4885 | ||
b742bb82 YZ |
4886 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
4887 | { | |
4888 | int index; | |
4889 | if (cache->flags & BTRFS_BLOCK_GROUP_RAID10) | |
4890 | index = 0; | |
4891 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1) | |
4892 | index = 1; | |
4893 | else if (cache->flags & BTRFS_BLOCK_GROUP_DUP) | |
4894 | index = 2; | |
4895 | else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) | |
4896 | index = 3; | |
4897 | else | |
4898 | index = 4; | |
4899 | return index; | |
4900 | } | |
4901 | ||
817d52f8 | 4902 | enum btrfs_loop_type { |
ccf0e725 | 4903 | LOOP_FIND_IDEAL = 0, |
817d52f8 JB |
4904 | LOOP_CACHING_NOWAIT = 1, |
4905 | LOOP_CACHING_WAIT = 2, | |
4906 | LOOP_ALLOC_CHUNK = 3, | |
4907 | LOOP_NO_EMPTY_SIZE = 4, | |
4908 | }; | |
4909 | ||
fec577fb CM |
4910 | /* |
4911 | * walks the btree of allocated extents and find a hole of a given size. | |
4912 | * The key ins is changed to record the hole: | |
4913 | * ins->objectid == block start | |
62e2749e | 4914 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
4915 | * ins->offset == number of blocks |
4916 | * Any available blocks before search_start are skipped. | |
4917 | */ | |
d397712b | 4918 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
4919 | struct btrfs_root *orig_root, |
4920 | u64 num_bytes, u64 empty_size, | |
4921 | u64 search_start, u64 search_end, | |
4922 | u64 hint_byte, struct btrfs_key *ins, | |
e0f54067 | 4923 | u64 data) |
fec577fb | 4924 | { |
80eb234a | 4925 | int ret = 0; |
d397712b | 4926 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 4927 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 4928 | struct btrfs_block_group_cache *block_group = NULL; |
239b14b3 | 4929 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 4930 | int allowed_chunk_alloc = 0; |
ccf0e725 | 4931 | int done_chunk_alloc = 0; |
80eb234a | 4932 | struct btrfs_space_info *space_info; |
fa9c0d79 CM |
4933 | int last_ptr_loop = 0; |
4934 | int loop = 0; | |
f0486c68 | 4935 | int index = 0; |
fb25e914 JB |
4936 | int alloc_type = (data & BTRFS_BLOCK_GROUP_DATA) ? |
4937 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
817d52f8 | 4938 | bool found_uncached_bg = false; |
0a24325e | 4939 | bool failed_cluster_refill = false; |
1cdda9b8 | 4940 | bool failed_alloc = false; |
67377734 | 4941 | bool use_cluster = true; |
ccf0e725 JB |
4942 | u64 ideal_cache_percent = 0; |
4943 | u64 ideal_cache_offset = 0; | |
fec577fb | 4944 | |
db94535d | 4945 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 4946 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
4947 | ins->objectid = 0; |
4948 | ins->offset = 0; | |
b1a4d965 | 4949 | |
2552d17e | 4950 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 | 4951 | if (!space_info) { |
e0f54067 | 4952 | printk(KERN_ERR "No space info for %llu\n", data); |
1b1d1f66 JB |
4953 | return -ENOSPC; |
4954 | } | |
2552d17e | 4955 | |
67377734 JB |
4956 | /* |
4957 | * If the space info is for both data and metadata it means we have a | |
4958 | * small filesystem and we can't use the clustering stuff. | |
4959 | */ | |
4960 | if (btrfs_mixed_space_info(space_info)) | |
4961 | use_cluster = false; | |
4962 | ||
0ef3e66b CM |
4963 | if (orig_root->ref_cows || empty_size) |
4964 | allowed_chunk_alloc = 1; | |
4965 | ||
67377734 | 4966 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 4967 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
4968 | if (!btrfs_test_opt(root, SSD)) |
4969 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
4970 | } |
4971 | ||
67377734 JB |
4972 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
4973 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
4974 | last_ptr = &root->fs_info->data_alloc_cluster; |
4975 | } | |
0f9dd46c | 4976 | |
239b14b3 | 4977 | if (last_ptr) { |
fa9c0d79 CM |
4978 | spin_lock(&last_ptr->lock); |
4979 | if (last_ptr->block_group) | |
4980 | hint_byte = last_ptr->window_start; | |
4981 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 4982 | } |
fa9c0d79 | 4983 | |
a061fc8d | 4984 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 4985 | search_start = max(search_start, hint_byte); |
0b86a832 | 4986 | |
817d52f8 | 4987 | if (!last_ptr) |
fa9c0d79 | 4988 | empty_cluster = 0; |
fa9c0d79 | 4989 | |
2552d17e | 4990 | if (search_start == hint_byte) { |
ccf0e725 | 4991 | ideal_cache: |
2552d17e JB |
4992 | block_group = btrfs_lookup_block_group(root->fs_info, |
4993 | search_start); | |
817d52f8 JB |
4994 | /* |
4995 | * we don't want to use the block group if it doesn't match our | |
4996 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
4997 | * |
4998 | * However if we are re-searching with an ideal block group | |
4999 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
5000 | */ |
5001 | if (block_group && block_group_bits(block_group, data) && | |
ccf0e725 JB |
5002 | (block_group->cached != BTRFS_CACHE_NO || |
5003 | search_start == ideal_cache_offset)) { | |
2552d17e | 5004 | down_read(&space_info->groups_sem); |
44fb5511 CM |
5005 | if (list_empty(&block_group->list) || |
5006 | block_group->ro) { | |
5007 | /* | |
5008 | * someone is removing this block group, | |
5009 | * we can't jump into the have_block_group | |
5010 | * target because our list pointers are not | |
5011 | * valid | |
5012 | */ | |
5013 | btrfs_put_block_group(block_group); | |
5014 | up_read(&space_info->groups_sem); | |
ccf0e725 | 5015 | } else { |
b742bb82 | 5016 | index = get_block_group_index(block_group); |
44fb5511 | 5017 | goto have_block_group; |
ccf0e725 | 5018 | } |
2552d17e | 5019 | } else if (block_group) { |
fa9c0d79 | 5020 | btrfs_put_block_group(block_group); |
2552d17e | 5021 | } |
42e70e7a | 5022 | } |
2552d17e | 5023 | search: |
80eb234a | 5024 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
5025 | list_for_each_entry(block_group, &space_info->block_groups[index], |
5026 | list) { | |
6226cb0a | 5027 | u64 offset; |
817d52f8 | 5028 | int cached; |
8a1413a2 | 5029 | |
11dfe35a | 5030 | btrfs_get_block_group(block_group); |
2552d17e | 5031 | search_start = block_group->key.objectid; |
42e70e7a | 5032 | |
83a50de9 CM |
5033 | /* |
5034 | * this can happen if we end up cycling through all the | |
5035 | * raid types, but we want to make sure we only allocate | |
5036 | * for the proper type. | |
5037 | */ | |
5038 | if (!block_group_bits(block_group, data)) { | |
5039 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
5040 | BTRFS_BLOCK_GROUP_RAID1 | | |
5041 | BTRFS_BLOCK_GROUP_RAID10; | |
5042 | ||
5043 | /* | |
5044 | * if they asked for extra copies and this block group | |
5045 | * doesn't provide them, bail. This does allow us to | |
5046 | * fill raid0 from raid1. | |
5047 | */ | |
5048 | if ((data & extra) && !(block_group->flags & extra)) | |
5049 | goto loop; | |
5050 | } | |
5051 | ||
2552d17e | 5052 | have_block_group: |
817d52f8 | 5053 | if (unlikely(block_group->cached == BTRFS_CACHE_NO)) { |
ccf0e725 JB |
5054 | u64 free_percent; |
5055 | ||
b8399dee JB |
5056 | ret = cache_block_group(block_group, trans, |
5057 | orig_root, 1); | |
9d66e233 JB |
5058 | if (block_group->cached == BTRFS_CACHE_FINISHED) |
5059 | goto have_block_group; | |
5060 | ||
ccf0e725 JB |
5061 | free_percent = btrfs_block_group_used(&block_group->item); |
5062 | free_percent *= 100; | |
5063 | free_percent = div64_u64(free_percent, | |
5064 | block_group->key.offset); | |
5065 | free_percent = 100 - free_percent; | |
5066 | if (free_percent > ideal_cache_percent && | |
5067 | likely(!block_group->ro)) { | |
5068 | ideal_cache_offset = block_group->key.objectid; | |
5069 | ideal_cache_percent = free_percent; | |
5070 | } | |
5071 | ||
817d52f8 | 5072 | /* |
bab39bf9 JB |
5073 | * The caching workers are limited to 2 threads, so we |
5074 | * can queue as much work as we care to. | |
817d52f8 | 5075 | */ |
bab39bf9 | 5076 | if (loop > LOOP_FIND_IDEAL) { |
b8399dee JB |
5077 | ret = cache_block_group(block_group, trans, |
5078 | orig_root, 0); | |
817d52f8 | 5079 | BUG_ON(ret); |
2552d17e | 5080 | } |
817d52f8 JB |
5081 | found_uncached_bg = true; |
5082 | ||
ccf0e725 JB |
5083 | /* |
5084 | * If loop is set for cached only, try the next block | |
5085 | * group. | |
5086 | */ | |
5087 | if (loop == LOOP_FIND_IDEAL) | |
817d52f8 JB |
5088 | goto loop; |
5089 | } | |
5090 | ||
ccf0e725 JB |
5091 | cached = block_group_cache_done(block_group); |
5092 | if (unlikely(!cached)) | |
5093 | found_uncached_bg = true; | |
5094 | ||
ea6a478e | 5095 | if (unlikely(block_group->ro)) |
2552d17e | 5096 | goto loop; |
0f9dd46c | 5097 | |
ff5714cc | 5098 | spin_lock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5099 | if (cached && |
ff5714cc CM |
5100 | block_group->free_space_ctl->free_space < |
5101 | num_bytes + empty_size) { | |
5102 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
cca1c81f JB |
5103 | goto loop; |
5104 | } | |
ff5714cc | 5105 | spin_unlock(&block_group->free_space_ctl->tree_lock); |
cca1c81f | 5106 | |
0a24325e JB |
5107 | /* |
5108 | * Ok we want to try and use the cluster allocator, so lets look | |
5109 | * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will | |
5110 | * have tried the cluster allocator plenty of times at this | |
5111 | * point and not have found anything, so we are likely way too | |
5112 | * fragmented for the clustering stuff to find anything, so lets | |
5113 | * just skip it and let the allocator find whatever block it can | |
5114 | * find | |
5115 | */ | |
5116 | if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) { | |
fa9c0d79 CM |
5117 | /* |
5118 | * the refill lock keeps out other | |
5119 | * people trying to start a new cluster | |
5120 | */ | |
5121 | spin_lock(&last_ptr->refill_lock); | |
44fb5511 CM |
5122 | if (last_ptr->block_group && |
5123 | (last_ptr->block_group->ro || | |
5124 | !block_group_bits(last_ptr->block_group, data))) { | |
5125 | offset = 0; | |
5126 | goto refill_cluster; | |
5127 | } | |
5128 | ||
fa9c0d79 CM |
5129 | offset = btrfs_alloc_from_cluster(block_group, last_ptr, |
5130 | num_bytes, search_start); | |
5131 | if (offset) { | |
5132 | /* we have a block, we're done */ | |
5133 | spin_unlock(&last_ptr->refill_lock); | |
5134 | goto checks; | |
5135 | } | |
5136 | ||
5137 | spin_lock(&last_ptr->lock); | |
5138 | /* | |
5139 | * whoops, this cluster doesn't actually point to | |
5140 | * this block group. Get a ref on the block | |
5141 | * group is does point to and try again | |
5142 | */ | |
5143 | if (!last_ptr_loop && last_ptr->block_group && | |
ff1f2b44 | 5144 | last_ptr->block_group != block_group && |
5145 | index <= | |
5146 | get_block_group_index(last_ptr->block_group)) { | |
fa9c0d79 CM |
5147 | |
5148 | btrfs_put_block_group(block_group); | |
5149 | block_group = last_ptr->block_group; | |
11dfe35a | 5150 | btrfs_get_block_group(block_group); |
fa9c0d79 CM |
5151 | spin_unlock(&last_ptr->lock); |
5152 | spin_unlock(&last_ptr->refill_lock); | |
5153 | ||
5154 | last_ptr_loop = 1; | |
5155 | search_start = block_group->key.objectid; | |
44fb5511 CM |
5156 | /* |
5157 | * we know this block group is properly | |
5158 | * in the list because | |
5159 | * btrfs_remove_block_group, drops the | |
5160 | * cluster before it removes the block | |
5161 | * group from the list | |
5162 | */ | |
fa9c0d79 CM |
5163 | goto have_block_group; |
5164 | } | |
5165 | spin_unlock(&last_ptr->lock); | |
44fb5511 | 5166 | refill_cluster: |
fa9c0d79 CM |
5167 | /* |
5168 | * this cluster didn't work out, free it and | |
5169 | * start over | |
5170 | */ | |
5171 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5172 | ||
5173 | last_ptr_loop = 0; | |
5174 | ||
5175 | /* allocate a cluster in this block group */ | |
451d7585 | 5176 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 CM |
5177 | block_group, last_ptr, |
5178 | offset, num_bytes, | |
5179 | empty_cluster + empty_size); | |
5180 | if (ret == 0) { | |
5181 | /* | |
5182 | * now pull our allocation out of this | |
5183 | * cluster | |
5184 | */ | |
5185 | offset = btrfs_alloc_from_cluster(block_group, | |
5186 | last_ptr, num_bytes, | |
5187 | search_start); | |
5188 | if (offset) { | |
5189 | /* we found one, proceed */ | |
5190 | spin_unlock(&last_ptr->refill_lock); | |
5191 | goto checks; | |
5192 | } | |
0a24325e JB |
5193 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
5194 | && !failed_cluster_refill) { | |
817d52f8 JB |
5195 | spin_unlock(&last_ptr->refill_lock); |
5196 | ||
0a24325e | 5197 | failed_cluster_refill = true; |
817d52f8 JB |
5198 | wait_block_group_cache_progress(block_group, |
5199 | num_bytes + empty_cluster + empty_size); | |
5200 | goto have_block_group; | |
fa9c0d79 | 5201 | } |
817d52f8 | 5202 | |
fa9c0d79 CM |
5203 | /* |
5204 | * at this point we either didn't find a cluster | |
5205 | * or we weren't able to allocate a block from our | |
5206 | * cluster. Free the cluster we've been trying | |
5207 | * to use, and go to the next block group | |
5208 | */ | |
0a24325e | 5209 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 5210 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 5211 | goto loop; |
fa9c0d79 CM |
5212 | } |
5213 | ||
6226cb0a JB |
5214 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
5215 | num_bytes, empty_size); | |
1cdda9b8 JB |
5216 | /* |
5217 | * If we didn't find a chunk, and we haven't failed on this | |
5218 | * block group before, and this block group is in the middle of | |
5219 | * caching and we are ok with waiting, then go ahead and wait | |
5220 | * for progress to be made, and set failed_alloc to true. | |
5221 | * | |
5222 | * If failed_alloc is true then we've already waited on this | |
5223 | * block group once and should move on to the next block group. | |
5224 | */ | |
5225 | if (!offset && !failed_alloc && !cached && | |
5226 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 5227 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
5228 | num_bytes + empty_size); |
5229 | failed_alloc = true; | |
817d52f8 | 5230 | goto have_block_group; |
1cdda9b8 JB |
5231 | } else if (!offset) { |
5232 | goto loop; | |
817d52f8 | 5233 | } |
fa9c0d79 | 5234 | checks: |
6226cb0a | 5235 | search_start = stripe_align(root, offset); |
2552d17e | 5236 | /* move on to the next group */ |
6226cb0a JB |
5237 | if (search_start + num_bytes >= search_end) { |
5238 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5239 | goto loop; |
6226cb0a | 5240 | } |
25179201 | 5241 | |
2552d17e JB |
5242 | /* move on to the next group */ |
5243 | if (search_start + num_bytes > | |
6226cb0a JB |
5244 | block_group->key.objectid + block_group->key.offset) { |
5245 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 5246 | goto loop; |
6226cb0a | 5247 | } |
f5a31e16 | 5248 | |
f0486c68 YZ |
5249 | ins->objectid = search_start; |
5250 | ins->offset = num_bytes; | |
2552d17e | 5251 | |
f0486c68 YZ |
5252 | if (offset < search_start) |
5253 | btrfs_add_free_space(block_group, offset, | |
5254 | search_start - offset); | |
5255 | BUG_ON(offset > search_start); | |
2552d17e | 5256 | |
fb25e914 JB |
5257 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, |
5258 | alloc_type); | |
f0486c68 | 5259 | if (ret == -EAGAIN) { |
6226cb0a | 5260 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 5261 | goto loop; |
0f9dd46c | 5262 | } |
0b86a832 | 5263 | |
f0486c68 | 5264 | /* we are all good, lets return */ |
2552d17e JB |
5265 | ins->objectid = search_start; |
5266 | ins->offset = num_bytes; | |
d2fb3437 | 5267 | |
6226cb0a JB |
5268 | if (offset < search_start) |
5269 | btrfs_add_free_space(block_group, offset, | |
5270 | search_start - offset); | |
5271 | BUG_ON(offset > search_start); | |
d82a6f1d | 5272 | btrfs_put_block_group(block_group); |
2552d17e JB |
5273 | break; |
5274 | loop: | |
0a24325e | 5275 | failed_cluster_refill = false; |
1cdda9b8 | 5276 | failed_alloc = false; |
b742bb82 | 5277 | BUG_ON(index != get_block_group_index(block_group)); |
fa9c0d79 | 5278 | btrfs_put_block_group(block_group); |
2552d17e JB |
5279 | } |
5280 | up_read(&space_info->groups_sem); | |
5281 | ||
b742bb82 YZ |
5282 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
5283 | goto search; | |
5284 | ||
ccf0e725 JB |
5285 | /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for |
5286 | * for them to make caching progress. Also | |
5287 | * determine the best possible bg to cache | |
5288 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
5289 | * caching kthreads as we move along | |
817d52f8 JB |
5290 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
5291 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
5292 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
5293 | * again | |
fa9c0d79 | 5294 | */ |
723bda20 | 5295 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 5296 | index = 0; |
ccf0e725 | 5297 | if (loop == LOOP_FIND_IDEAL && found_uncached_bg) { |
817d52f8 | 5298 | found_uncached_bg = false; |
ccf0e725 | 5299 | loop++; |
bab39bf9 | 5300 | if (!ideal_cache_percent) |
817d52f8 | 5301 | goto search; |
ccf0e725 JB |
5302 | |
5303 | /* | |
5304 | * 1 of the following 2 things have happened so far | |
5305 | * | |
5306 | * 1) We found an ideal block group for caching that | |
5307 | * is mostly full and will cache quickly, so we might | |
5308 | * as well wait for it. | |
5309 | * | |
5310 | * 2) We searched for cached only and we didn't find | |
5311 | * anything, and we didn't start any caching kthreads | |
5312 | * either, so chances are we will loop through and | |
5313 | * start a couple caching kthreads, and then come back | |
5314 | * around and just wait for them. This will be slower | |
5315 | * because we will have 2 caching kthreads reading at | |
5316 | * the same time when we could have just started one | |
5317 | * and waited for it to get far enough to give us an | |
5318 | * allocation, so go ahead and go to the wait caching | |
5319 | * loop. | |
5320 | */ | |
5321 | loop = LOOP_CACHING_WAIT; | |
5322 | search_start = ideal_cache_offset; | |
5323 | ideal_cache_percent = 0; | |
5324 | goto ideal_cache; | |
5325 | } else if (loop == LOOP_FIND_IDEAL) { | |
5326 | /* | |
5327 | * Didn't find a uncached bg, wait on anything we find | |
5328 | * next. | |
5329 | */ | |
5330 | loop = LOOP_CACHING_WAIT; | |
5331 | goto search; | |
5332 | } | |
5333 | ||
723bda20 | 5334 | loop++; |
817d52f8 JB |
5335 | |
5336 | if (loop == LOOP_ALLOC_CHUNK) { | |
723bda20 JB |
5337 | if (allowed_chunk_alloc) { |
5338 | ret = do_chunk_alloc(trans, root, num_bytes + | |
5339 | 2 * 1024 * 1024, data, | |
5340 | CHUNK_ALLOC_LIMITED); | |
5341 | allowed_chunk_alloc = 0; | |
5342 | if (ret == 1) | |
5343 | done_chunk_alloc = 1; | |
5344 | } else if (!done_chunk_alloc && | |
5345 | space_info->force_alloc == | |
5346 | CHUNK_ALLOC_NO_FORCE) { | |
5347 | space_info->force_alloc = CHUNK_ALLOC_LIMITED; | |
5348 | } | |
2552d17e | 5349 | |
723bda20 JB |
5350 | /* |
5351 | * We didn't allocate a chunk, go ahead and drop the | |
5352 | * empty size and loop again. | |
5353 | */ | |
5354 | if (!done_chunk_alloc) | |
5355 | loop = LOOP_NO_EMPTY_SIZE; | |
2552d17e JB |
5356 | } |
5357 | ||
723bda20 JB |
5358 | if (loop == LOOP_NO_EMPTY_SIZE) { |
5359 | empty_size = 0; | |
5360 | empty_cluster = 0; | |
fa9c0d79 | 5361 | } |
723bda20 JB |
5362 | |
5363 | goto search; | |
2552d17e JB |
5364 | } else if (!ins->objectid) { |
5365 | ret = -ENOSPC; | |
d82a6f1d | 5366 | } else if (ins->objectid) { |
80eb234a | 5367 | ret = 0; |
be744175 | 5368 | } |
be744175 | 5369 | |
0f70abe2 | 5370 | return ret; |
fec577fb | 5371 | } |
ec44a35c | 5372 | |
9ed74f2d JB |
5373 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
5374 | int dump_block_groups) | |
0f9dd46c JB |
5375 | { |
5376 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 5377 | int index = 0; |
0f9dd46c | 5378 | |
9ed74f2d | 5379 | spin_lock(&info->lock); |
fb25e914 JB |
5380 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
5381 | (unsigned long long)info->flags, | |
d397712b | 5382 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 5383 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 5384 | info->bytes_readonly), |
d397712b | 5385 | (info->full) ? "" : "not "); |
8929ecfa YZ |
5386 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
5387 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 5388 | (unsigned long long)info->total_bytes, |
8929ecfa | 5389 | (unsigned long long)info->bytes_used, |
21380931 | 5390 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 5391 | (unsigned long long)info->bytes_reserved, |
21380931 | 5392 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 5393 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
5394 | spin_unlock(&info->lock); |
5395 | ||
5396 | if (!dump_block_groups) | |
5397 | return; | |
0f9dd46c | 5398 | |
80eb234a | 5399 | down_read(&info->groups_sem); |
b742bb82 YZ |
5400 | again: |
5401 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 5402 | spin_lock(&cache->lock); |
d397712b CM |
5403 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
5404 | "%llu pinned %llu reserved\n", | |
5405 | (unsigned long long)cache->key.objectid, | |
5406 | (unsigned long long)cache->key.offset, | |
5407 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
5408 | (unsigned long long)cache->pinned, | |
5409 | (unsigned long long)cache->reserved); | |
0f9dd46c JB |
5410 | btrfs_dump_free_space(cache, bytes); |
5411 | spin_unlock(&cache->lock); | |
5412 | } | |
b742bb82 YZ |
5413 | if (++index < BTRFS_NR_RAID_TYPES) |
5414 | goto again; | |
80eb234a | 5415 | up_read(&info->groups_sem); |
0f9dd46c | 5416 | } |
e8569813 | 5417 | |
11833d66 YZ |
5418 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
5419 | struct btrfs_root *root, | |
5420 | u64 num_bytes, u64 min_alloc_size, | |
5421 | u64 empty_size, u64 hint_byte, | |
5422 | u64 search_end, struct btrfs_key *ins, | |
5423 | u64 data) | |
fec577fb CM |
5424 | { |
5425 | int ret; | |
fbdc762b | 5426 | u64 search_start = 0; |
925baedd | 5427 | |
6a63209f | 5428 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 5429 | again: |
0ef3e66b CM |
5430 | /* |
5431 | * the only place that sets empty_size is btrfs_realloc_node, which | |
5432 | * is not called recursively on allocations | |
5433 | */ | |
83d3c969 | 5434 | if (empty_size || root->ref_cows) |
6324fbf3 | 5435 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
5436 | num_bytes + 2 * 1024 * 1024, data, |
5437 | CHUNK_ALLOC_NO_FORCE); | |
0b86a832 | 5438 | |
db94535d CM |
5439 | WARN_ON(num_bytes < root->sectorsize); |
5440 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
f0486c68 YZ |
5441 | search_start, search_end, hint_byte, |
5442 | ins, data); | |
3b951516 | 5443 | |
98d20f67 CM |
5444 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
5445 | num_bytes = num_bytes >> 1; | |
0f9dd46c | 5446 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
98d20f67 | 5447 | num_bytes = max(num_bytes, min_alloc_size); |
0ef3e66b | 5448 | do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 | 5449 | num_bytes, data, CHUNK_ALLOC_FORCE); |
98d20f67 CM |
5450 | goto again; |
5451 | } | |
91435650 | 5452 | if (ret == -ENOSPC && btrfs_test_opt(root, ENOSPC_DEBUG)) { |
0f9dd46c JB |
5453 | struct btrfs_space_info *sinfo; |
5454 | ||
5455 | sinfo = __find_space_info(root->fs_info, data); | |
d397712b CM |
5456 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
5457 | "wanted %llu\n", (unsigned long long)data, | |
5458 | (unsigned long long)num_bytes); | |
9ed74f2d | 5459 | dump_space_info(sinfo, num_bytes, 1); |
925baedd | 5460 | } |
0f9dd46c | 5461 | |
1abe9b8a | 5462 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
5463 | ||
0f9dd46c | 5464 | return ret; |
e6dcd2dc CM |
5465 | } |
5466 | ||
65b51a00 CM |
5467 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
5468 | { | |
0f9dd46c | 5469 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 5470 | int ret = 0; |
0f9dd46c | 5471 | |
0f9dd46c JB |
5472 | cache = btrfs_lookup_block_group(root->fs_info, start); |
5473 | if (!cache) { | |
d397712b CM |
5474 | printk(KERN_ERR "Unable to find block group for %llu\n", |
5475 | (unsigned long long)start); | |
0f9dd46c JB |
5476 | return -ENOSPC; |
5477 | } | |
1f3c79a2 | 5478 | |
5378e607 LD |
5479 | if (btrfs_test_opt(root, DISCARD)) |
5480 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 5481 | |
0f9dd46c | 5482 | btrfs_add_free_space(cache, start, len); |
fb25e914 | 5483 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); |
fa9c0d79 | 5484 | btrfs_put_block_group(cache); |
817d52f8 | 5485 | |
1abe9b8a | 5486 | trace_btrfs_reserved_extent_free(root, start, len); |
5487 | ||
e6dcd2dc CM |
5488 | return ret; |
5489 | } | |
5490 | ||
5d4f98a2 YZ |
5491 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
5492 | struct btrfs_root *root, | |
5493 | u64 parent, u64 root_objectid, | |
5494 | u64 flags, u64 owner, u64 offset, | |
5495 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
5496 | { |
5497 | int ret; | |
5d4f98a2 | 5498 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 5499 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 5500 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 5501 | struct btrfs_path *path; |
5d4f98a2 YZ |
5502 | struct extent_buffer *leaf; |
5503 | int type; | |
5504 | u32 size; | |
26b8003f | 5505 | |
5d4f98a2 YZ |
5506 | if (parent > 0) |
5507 | type = BTRFS_SHARED_DATA_REF_KEY; | |
5508 | else | |
5509 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 5510 | |
5d4f98a2 | 5511 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
5512 | |
5513 | path = btrfs_alloc_path(); | |
db5b493a TI |
5514 | if (!path) |
5515 | return -ENOMEM; | |
47e4bb98 | 5516 | |
b9473439 | 5517 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5518 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
5519 | ins, size); | |
ccd467d6 | 5520 | BUG_ON(ret); |
0f9dd46c | 5521 | |
5d4f98a2 YZ |
5522 | leaf = path->nodes[0]; |
5523 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 5524 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5525 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
5526 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5527 | btrfs_set_extent_flags(leaf, extent_item, | |
5528 | flags | BTRFS_EXTENT_FLAG_DATA); | |
5529 | ||
5530 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
5531 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
5532 | if (parent > 0) { | |
5533 | struct btrfs_shared_data_ref *ref; | |
5534 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
5535 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5536 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
5537 | } else { | |
5538 | struct btrfs_extent_data_ref *ref; | |
5539 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
5540 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
5541 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
5542 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
5543 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
5544 | } | |
47e4bb98 CM |
5545 | |
5546 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 5547 | btrfs_free_path(path); |
f510cfec | 5548 | |
f0486c68 | 5549 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
f5947066 | 5550 | if (ret) { |
d397712b CM |
5551 | printk(KERN_ERR "btrfs update block group failed for %llu " |
5552 | "%llu\n", (unsigned long long)ins->objectid, | |
5553 | (unsigned long long)ins->offset); | |
f5947066 CM |
5554 | BUG(); |
5555 | } | |
e6dcd2dc CM |
5556 | return ret; |
5557 | } | |
5558 | ||
5d4f98a2 YZ |
5559 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
5560 | struct btrfs_root *root, | |
5561 | u64 parent, u64 root_objectid, | |
5562 | u64 flags, struct btrfs_disk_key *key, | |
5563 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
5564 | { |
5565 | int ret; | |
5d4f98a2 YZ |
5566 | struct btrfs_fs_info *fs_info = root->fs_info; |
5567 | struct btrfs_extent_item *extent_item; | |
5568 | struct btrfs_tree_block_info *block_info; | |
5569 | struct btrfs_extent_inline_ref *iref; | |
5570 | struct btrfs_path *path; | |
5571 | struct extent_buffer *leaf; | |
5572 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 5573 | |
5d4f98a2 | 5574 | path = btrfs_alloc_path(); |
d8926bb3 MF |
5575 | if (!path) |
5576 | return -ENOMEM; | |
56bec294 | 5577 | |
5d4f98a2 YZ |
5578 | path->leave_spinning = 1; |
5579 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
5580 | ins, size); | |
56bec294 | 5581 | BUG_ON(ret); |
5d4f98a2 YZ |
5582 | |
5583 | leaf = path->nodes[0]; | |
5584 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
5585 | struct btrfs_extent_item); | |
5586 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
5587 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
5588 | btrfs_set_extent_flags(leaf, extent_item, | |
5589 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5590 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
5591 | ||
5592 | btrfs_set_tree_block_key(leaf, block_info, key); | |
5593 | btrfs_set_tree_block_level(leaf, block_info, level); | |
5594 | ||
5595 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
5596 | if (parent > 0) { | |
5597 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
5598 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5599 | BTRFS_SHARED_BLOCK_REF_KEY); | |
5600 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
5601 | } else { | |
5602 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
5603 | BTRFS_TREE_BLOCK_REF_KEY); | |
5604 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
5605 | } | |
5606 | ||
5607 | btrfs_mark_buffer_dirty(leaf); | |
5608 | btrfs_free_path(path); | |
5609 | ||
f0486c68 | 5610 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); |
5d4f98a2 YZ |
5611 | if (ret) { |
5612 | printk(KERN_ERR "btrfs update block group failed for %llu " | |
5613 | "%llu\n", (unsigned long long)ins->objectid, | |
5614 | (unsigned long long)ins->offset); | |
5615 | BUG(); | |
5616 | } | |
5617 | return ret; | |
5618 | } | |
5619 | ||
5620 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
5621 | struct btrfs_root *root, | |
5622 | u64 root_objectid, u64 owner, | |
5623 | u64 offset, struct btrfs_key *ins) | |
5624 | { | |
5625 | int ret; | |
5626 | ||
5627 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
5628 | ||
5629 | ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, | |
5630 | 0, root_objectid, owner, offset, | |
5631 | BTRFS_ADD_DELAYED_EXTENT, NULL); | |
e6dcd2dc CM |
5632 | return ret; |
5633 | } | |
e02119d5 CM |
5634 | |
5635 | /* | |
5636 | * this is used by the tree logging recovery code. It records that | |
5637 | * an extent has been allocated and makes sure to clear the free | |
5638 | * space cache bits as well | |
5639 | */ | |
5d4f98a2 YZ |
5640 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
5641 | struct btrfs_root *root, | |
5642 | u64 root_objectid, u64 owner, u64 offset, | |
5643 | struct btrfs_key *ins) | |
e02119d5 CM |
5644 | { |
5645 | int ret; | |
5646 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
5647 | struct btrfs_caching_control *caching_ctl; |
5648 | u64 start = ins->objectid; | |
5649 | u64 num_bytes = ins->offset; | |
e02119d5 | 5650 | |
e02119d5 | 5651 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
b8399dee | 5652 | cache_block_group(block_group, trans, NULL, 0); |
11833d66 | 5653 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 5654 | |
11833d66 YZ |
5655 | if (!caching_ctl) { |
5656 | BUG_ON(!block_group_cache_done(block_group)); | |
5657 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5658 | BUG_ON(ret); | |
5659 | } else { | |
5660 | mutex_lock(&caching_ctl->mutex); | |
5661 | ||
5662 | if (start >= caching_ctl->progress) { | |
5663 | ret = add_excluded_extent(root, start, num_bytes); | |
5664 | BUG_ON(ret); | |
5665 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5666 | ret = btrfs_remove_free_space(block_group, | |
5667 | start, num_bytes); | |
5668 | BUG_ON(ret); | |
5669 | } else { | |
5670 | num_bytes = caching_ctl->progress - start; | |
5671 | ret = btrfs_remove_free_space(block_group, | |
5672 | start, num_bytes); | |
5673 | BUG_ON(ret); | |
5674 | ||
5675 | start = caching_ctl->progress; | |
5676 | num_bytes = ins->objectid + ins->offset - | |
5677 | caching_ctl->progress; | |
5678 | ret = add_excluded_extent(root, start, num_bytes); | |
5679 | BUG_ON(ret); | |
5680 | } | |
5681 | ||
5682 | mutex_unlock(&caching_ctl->mutex); | |
5683 | put_caching_control(caching_ctl); | |
5684 | } | |
5685 | ||
fb25e914 JB |
5686 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
5687 | RESERVE_ALLOC_NO_ACCOUNT); | |
f0486c68 | 5688 | BUG_ON(ret); |
fa9c0d79 | 5689 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
5690 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
5691 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
5692 | return ret; |
5693 | } | |
5694 | ||
65b51a00 CM |
5695 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
5696 | struct btrfs_root *root, | |
4008c04a CM |
5697 | u64 bytenr, u32 blocksize, |
5698 | int level) | |
65b51a00 CM |
5699 | { |
5700 | struct extent_buffer *buf; | |
5701 | ||
5702 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
5703 | if (!buf) | |
5704 | return ERR_PTR(-ENOMEM); | |
5705 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 5706 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
5707 | btrfs_tree_lock(buf); |
5708 | clean_tree_block(trans, root, buf); | |
b4ce94de CM |
5709 | |
5710 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 5711 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 5712 | |
d0c803c4 | 5713 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
5714 | /* |
5715 | * we allow two log transactions at a time, use different | |
5716 | * EXENT bit to differentiate dirty pages. | |
5717 | */ | |
5718 | if (root->log_transid % 2 == 0) | |
5719 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
5720 | buf->start + buf->len - 1, GFP_NOFS); | |
5721 | else | |
5722 | set_extent_new(&root->dirty_log_pages, buf->start, | |
5723 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
5724 | } else { |
5725 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 5726 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 5727 | } |
65b51a00 | 5728 | trans->blocks_used++; |
b4ce94de | 5729 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
5730 | return buf; |
5731 | } | |
5732 | ||
f0486c68 YZ |
5733 | static struct btrfs_block_rsv * |
5734 | use_block_rsv(struct btrfs_trans_handle *trans, | |
5735 | struct btrfs_root *root, u32 blocksize) | |
5736 | { | |
5737 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 5738 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
5739 | int ret; |
5740 | ||
5741 | block_rsv = get_block_rsv(trans, root); | |
5742 | ||
5743 | if (block_rsv->size == 0) { | |
36ba022a | 5744 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0); |
68a82277 JB |
5745 | /* |
5746 | * If we couldn't reserve metadata bytes try and use some from | |
5747 | * the global reserve. | |
5748 | */ | |
5749 | if (ret && block_rsv != global_rsv) { | |
5750 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5751 | if (!ret) | |
5752 | return global_rsv; | |
f0486c68 | 5753 | return ERR_PTR(ret); |
68a82277 | 5754 | } else if (ret) { |
f0486c68 | 5755 | return ERR_PTR(ret); |
68a82277 | 5756 | } |
f0486c68 YZ |
5757 | return block_rsv; |
5758 | } | |
5759 | ||
5760 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
5761 | if (!ret) | |
5762 | return block_rsv; | |
68a82277 JB |
5763 | if (ret) { |
5764 | WARN_ON(1); | |
36ba022a | 5765 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, 0); |
68a82277 | 5766 | if (!ret) { |
68a82277 JB |
5767 | return block_rsv; |
5768 | } else if (ret && block_rsv != global_rsv) { | |
5769 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
5770 | if (!ret) | |
5771 | return global_rsv; | |
5772 | } | |
5773 | } | |
f0486c68 | 5774 | |
f0486c68 YZ |
5775 | return ERR_PTR(-ENOSPC); |
5776 | } | |
5777 | ||
5778 | static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
5779 | { | |
5780 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
5781 | block_rsv_release_bytes(block_rsv, NULL, 0); | |
5782 | } | |
5783 | ||
fec577fb | 5784 | /* |
f0486c68 YZ |
5785 | * finds a free extent and does all the dirty work required for allocation |
5786 | * returns the key for the extent through ins, and a tree buffer for | |
5787 | * the first block of the extent through buf. | |
5788 | * | |
fec577fb CM |
5789 | * returns the tree buffer or NULL. |
5790 | */ | |
5f39d397 | 5791 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
5792 | struct btrfs_root *root, u32 blocksize, |
5793 | u64 parent, u64 root_objectid, | |
5794 | struct btrfs_disk_key *key, int level, | |
5795 | u64 hint, u64 empty_size) | |
fec577fb | 5796 | { |
e2fa7227 | 5797 | struct btrfs_key ins; |
f0486c68 | 5798 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 5799 | struct extent_buffer *buf; |
f0486c68 YZ |
5800 | u64 flags = 0; |
5801 | int ret; | |
5802 | ||
fec577fb | 5803 | |
f0486c68 YZ |
5804 | block_rsv = use_block_rsv(trans, root, blocksize); |
5805 | if (IS_ERR(block_rsv)) | |
5806 | return ERR_CAST(block_rsv); | |
5807 | ||
5808 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
5809 | empty_size, hint, (u64)-1, &ins, 0); | |
fec577fb | 5810 | if (ret) { |
f0486c68 | 5811 | unuse_block_rsv(block_rsv, blocksize); |
54aa1f4d | 5812 | return ERR_PTR(ret); |
fec577fb | 5813 | } |
55c69072 | 5814 | |
4008c04a CM |
5815 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
5816 | blocksize, level); | |
f0486c68 YZ |
5817 | BUG_ON(IS_ERR(buf)); |
5818 | ||
5819 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
5820 | if (parent == 0) | |
5821 | parent = ins.objectid; | |
5822 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
5823 | } else | |
5824 | BUG_ON(parent > 0); | |
5825 | ||
5826 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5827 | struct btrfs_delayed_extent_op *extent_op; | |
5828 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); | |
5829 | BUG_ON(!extent_op); | |
5830 | if (key) | |
5831 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
5832 | else | |
5833 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
5834 | extent_op->flags_to_set = flags; | |
5835 | extent_op->update_key = 1; | |
5836 | extent_op->update_flags = 1; | |
5837 | extent_op->is_data = 0; | |
5838 | ||
5839 | ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, | |
5840 | ins.offset, parent, root_objectid, | |
5841 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5842 | extent_op); | |
5843 | BUG_ON(ret); | |
5844 | } | |
fec577fb CM |
5845 | return buf; |
5846 | } | |
a28ec197 | 5847 | |
2c47e605 YZ |
5848 | struct walk_control { |
5849 | u64 refs[BTRFS_MAX_LEVEL]; | |
5850 | u64 flags[BTRFS_MAX_LEVEL]; | |
5851 | struct btrfs_key update_progress; | |
5852 | int stage; | |
5853 | int level; | |
5854 | int shared_level; | |
5855 | int update_ref; | |
5856 | int keep_locks; | |
1c4850e2 YZ |
5857 | int reada_slot; |
5858 | int reada_count; | |
2c47e605 YZ |
5859 | }; |
5860 | ||
5861 | #define DROP_REFERENCE 1 | |
5862 | #define UPDATE_BACKREF 2 | |
5863 | ||
1c4850e2 YZ |
5864 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
5865 | struct btrfs_root *root, | |
5866 | struct walk_control *wc, | |
5867 | struct btrfs_path *path) | |
6407bf6d | 5868 | { |
1c4850e2 YZ |
5869 | u64 bytenr; |
5870 | u64 generation; | |
5871 | u64 refs; | |
94fcca9f | 5872 | u64 flags; |
5d4f98a2 | 5873 | u32 nritems; |
1c4850e2 YZ |
5874 | u32 blocksize; |
5875 | struct btrfs_key key; | |
5876 | struct extent_buffer *eb; | |
6407bf6d | 5877 | int ret; |
1c4850e2 YZ |
5878 | int slot; |
5879 | int nread = 0; | |
6407bf6d | 5880 | |
1c4850e2 YZ |
5881 | if (path->slots[wc->level] < wc->reada_slot) { |
5882 | wc->reada_count = wc->reada_count * 2 / 3; | |
5883 | wc->reada_count = max(wc->reada_count, 2); | |
5884 | } else { | |
5885 | wc->reada_count = wc->reada_count * 3 / 2; | |
5886 | wc->reada_count = min_t(int, wc->reada_count, | |
5887 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
5888 | } | |
7bb86316 | 5889 | |
1c4850e2 YZ |
5890 | eb = path->nodes[wc->level]; |
5891 | nritems = btrfs_header_nritems(eb); | |
5892 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 5893 | |
1c4850e2 YZ |
5894 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
5895 | if (nread >= wc->reada_count) | |
5896 | break; | |
bd56b302 | 5897 | |
2dd3e67b | 5898 | cond_resched(); |
1c4850e2 YZ |
5899 | bytenr = btrfs_node_blockptr(eb, slot); |
5900 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 5901 | |
1c4850e2 YZ |
5902 | if (slot == path->slots[wc->level]) |
5903 | goto reada; | |
5d4f98a2 | 5904 | |
1c4850e2 YZ |
5905 | if (wc->stage == UPDATE_BACKREF && |
5906 | generation <= root->root_key.offset) | |
bd56b302 CM |
5907 | continue; |
5908 | ||
94fcca9f YZ |
5909 | /* We don't lock the tree block, it's OK to be racy here */ |
5910 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
5911 | &refs, &flags); | |
5912 | BUG_ON(ret); | |
5913 | BUG_ON(refs == 0); | |
5914 | ||
1c4850e2 | 5915 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
5916 | if (refs == 1) |
5917 | goto reada; | |
bd56b302 | 5918 | |
94fcca9f YZ |
5919 | if (wc->level == 1 && |
5920 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5921 | continue; | |
1c4850e2 YZ |
5922 | if (!wc->update_ref || |
5923 | generation <= root->root_key.offset) | |
5924 | continue; | |
5925 | btrfs_node_key_to_cpu(eb, &key, slot); | |
5926 | ret = btrfs_comp_cpu_keys(&key, | |
5927 | &wc->update_progress); | |
5928 | if (ret < 0) | |
5929 | continue; | |
94fcca9f YZ |
5930 | } else { |
5931 | if (wc->level == 1 && | |
5932 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
5933 | continue; | |
6407bf6d | 5934 | } |
1c4850e2 YZ |
5935 | reada: |
5936 | ret = readahead_tree_block(root, bytenr, blocksize, | |
5937 | generation); | |
5938 | if (ret) | |
bd56b302 | 5939 | break; |
1c4850e2 | 5940 | nread++; |
20524f02 | 5941 | } |
1c4850e2 | 5942 | wc->reada_slot = slot; |
20524f02 | 5943 | } |
2c47e605 | 5944 | |
f82d02d9 | 5945 | /* |
2c47e605 YZ |
5946 | * hepler to process tree block while walking down the tree. |
5947 | * | |
2c47e605 YZ |
5948 | * when wc->stage == UPDATE_BACKREF, this function updates |
5949 | * back refs for pointers in the block. | |
5950 | * | |
5951 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 5952 | */ |
2c47e605 | 5953 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 5954 | struct btrfs_root *root, |
2c47e605 | 5955 | struct btrfs_path *path, |
94fcca9f | 5956 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 5957 | { |
2c47e605 YZ |
5958 | int level = wc->level; |
5959 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 5960 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
5961 | int ret; |
5962 | ||
2c47e605 YZ |
5963 | if (wc->stage == UPDATE_BACKREF && |
5964 | btrfs_header_owner(eb) != root->root_key.objectid) | |
5965 | return 1; | |
f82d02d9 | 5966 | |
2c47e605 YZ |
5967 | /* |
5968 | * when reference count of tree block is 1, it won't increase | |
5969 | * again. once full backref flag is set, we never clear it. | |
5970 | */ | |
94fcca9f YZ |
5971 | if (lookup_info && |
5972 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
5973 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
5974 | BUG_ON(!path->locks[level]); |
5975 | ret = btrfs_lookup_extent_info(trans, root, | |
5976 | eb->start, eb->len, | |
5977 | &wc->refs[level], | |
5978 | &wc->flags[level]); | |
5979 | BUG_ON(ret); | |
5980 | BUG_ON(wc->refs[level] == 0); | |
5981 | } | |
5d4f98a2 | 5982 | |
2c47e605 YZ |
5983 | if (wc->stage == DROP_REFERENCE) { |
5984 | if (wc->refs[level] > 1) | |
5985 | return 1; | |
f82d02d9 | 5986 | |
2c47e605 | 5987 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 5988 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
5989 | path->locks[level] = 0; |
5990 | } | |
5991 | return 0; | |
5992 | } | |
f82d02d9 | 5993 | |
2c47e605 YZ |
5994 | /* wc->stage == UPDATE_BACKREF */ |
5995 | if (!(wc->flags[level] & flag)) { | |
5996 | BUG_ON(!path->locks[level]); | |
5997 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
f82d02d9 | 5998 | BUG_ON(ret); |
2c47e605 YZ |
5999 | ret = btrfs_dec_ref(trans, root, eb, 0); |
6000 | BUG_ON(ret); | |
6001 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
6002 | eb->len, flag, 0); | |
6003 | BUG_ON(ret); | |
6004 | wc->flags[level] |= flag; | |
6005 | } | |
6006 | ||
6007 | /* | |
6008 | * the block is shared by multiple trees, so it's not good to | |
6009 | * keep the tree lock | |
6010 | */ | |
6011 | if (path->locks[level] && level > 0) { | |
bd681513 | 6012 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6013 | path->locks[level] = 0; |
6014 | } | |
6015 | return 0; | |
6016 | } | |
6017 | ||
1c4850e2 YZ |
6018 | /* |
6019 | * hepler to process tree block pointer. | |
6020 | * | |
6021 | * when wc->stage == DROP_REFERENCE, this function checks | |
6022 | * reference count of the block pointed to. if the block | |
6023 | * is shared and we need update back refs for the subtree | |
6024 | * rooted at the block, this function changes wc->stage to | |
6025 | * UPDATE_BACKREF. if the block is shared and there is no | |
6026 | * need to update back, this function drops the reference | |
6027 | * to the block. | |
6028 | * | |
6029 | * NOTE: return value 1 means we should stop walking down. | |
6030 | */ | |
6031 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
6032 | struct btrfs_root *root, | |
6033 | struct btrfs_path *path, | |
94fcca9f | 6034 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
6035 | { |
6036 | u64 bytenr; | |
6037 | u64 generation; | |
6038 | u64 parent; | |
6039 | u32 blocksize; | |
6040 | struct btrfs_key key; | |
6041 | struct extent_buffer *next; | |
6042 | int level = wc->level; | |
6043 | int reada = 0; | |
6044 | int ret = 0; | |
6045 | ||
6046 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
6047 | path->slots[level]); | |
6048 | /* | |
6049 | * if the lower level block was created before the snapshot | |
6050 | * was created, we know there is no need to update back refs | |
6051 | * for the subtree | |
6052 | */ | |
6053 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
6054 | generation <= root->root_key.offset) { |
6055 | *lookup_info = 1; | |
1c4850e2 | 6056 | return 1; |
94fcca9f | 6057 | } |
1c4850e2 YZ |
6058 | |
6059 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
6060 | blocksize = btrfs_level_size(root, level - 1); | |
6061 | ||
6062 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
6063 | if (!next) { | |
6064 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
6065 | if (!next) |
6066 | return -ENOMEM; | |
1c4850e2 YZ |
6067 | reada = 1; |
6068 | } | |
6069 | btrfs_tree_lock(next); | |
6070 | btrfs_set_lock_blocking(next); | |
6071 | ||
94fcca9f YZ |
6072 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
6073 | &wc->refs[level - 1], | |
6074 | &wc->flags[level - 1]); | |
6075 | BUG_ON(ret); | |
6076 | BUG_ON(wc->refs[level - 1] == 0); | |
6077 | *lookup_info = 0; | |
1c4850e2 | 6078 | |
94fcca9f | 6079 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 6080 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
6081 | if (level == 1 && |
6082 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6083 | goto skip; | |
6084 | ||
1c4850e2 YZ |
6085 | if (!wc->update_ref || |
6086 | generation <= root->root_key.offset) | |
6087 | goto skip; | |
6088 | ||
6089 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
6090 | path->slots[level]); | |
6091 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
6092 | if (ret < 0) | |
6093 | goto skip; | |
6094 | ||
6095 | wc->stage = UPDATE_BACKREF; | |
6096 | wc->shared_level = level - 1; | |
6097 | } | |
94fcca9f YZ |
6098 | } else { |
6099 | if (level == 1 && | |
6100 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6101 | goto skip; | |
1c4850e2 YZ |
6102 | } |
6103 | ||
6104 | if (!btrfs_buffer_uptodate(next, generation)) { | |
6105 | btrfs_tree_unlock(next); | |
6106 | free_extent_buffer(next); | |
6107 | next = NULL; | |
94fcca9f | 6108 | *lookup_info = 1; |
1c4850e2 YZ |
6109 | } |
6110 | ||
6111 | if (!next) { | |
6112 | if (reada && level == 1) | |
6113 | reada_walk_down(trans, root, wc, path); | |
6114 | next = read_tree_block(root, bytenr, blocksize, generation); | |
97d9a8a4 TI |
6115 | if (!next) |
6116 | return -EIO; | |
1c4850e2 YZ |
6117 | btrfs_tree_lock(next); |
6118 | btrfs_set_lock_blocking(next); | |
6119 | } | |
6120 | ||
6121 | level--; | |
6122 | BUG_ON(level != btrfs_header_level(next)); | |
6123 | path->nodes[level] = next; | |
6124 | path->slots[level] = 0; | |
bd681513 | 6125 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
6126 | wc->level = level; |
6127 | if (wc->level == 1) | |
6128 | wc->reada_slot = 0; | |
6129 | return 0; | |
6130 | skip: | |
6131 | wc->refs[level - 1] = 0; | |
6132 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6133 | if (wc->stage == DROP_REFERENCE) { |
6134 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6135 | parent = path->nodes[level]->start; | |
6136 | } else { | |
6137 | BUG_ON(root->root_key.objectid != | |
6138 | btrfs_header_owner(path->nodes[level])); | |
6139 | parent = 0; | |
6140 | } | |
1c4850e2 | 6141 | |
94fcca9f YZ |
6142 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
6143 | root->root_key.objectid, level - 1, 0); | |
6144 | BUG_ON(ret); | |
1c4850e2 | 6145 | } |
1c4850e2 YZ |
6146 | btrfs_tree_unlock(next); |
6147 | free_extent_buffer(next); | |
94fcca9f | 6148 | *lookup_info = 1; |
1c4850e2 YZ |
6149 | return 1; |
6150 | } | |
6151 | ||
2c47e605 YZ |
6152 | /* |
6153 | * hepler to process tree block while walking up the tree. | |
6154 | * | |
6155 | * when wc->stage == DROP_REFERENCE, this function drops | |
6156 | * reference count on the block. | |
6157 | * | |
6158 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6159 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6160 | * to UPDATE_BACKREF previously while processing the block. | |
6161 | * | |
6162 | * NOTE: return value 1 means we should stop walking up. | |
6163 | */ | |
6164 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6165 | struct btrfs_root *root, | |
6166 | struct btrfs_path *path, | |
6167 | struct walk_control *wc) | |
6168 | { | |
f0486c68 | 6169 | int ret; |
2c47e605 YZ |
6170 | int level = wc->level; |
6171 | struct extent_buffer *eb = path->nodes[level]; | |
6172 | u64 parent = 0; | |
6173 | ||
6174 | if (wc->stage == UPDATE_BACKREF) { | |
6175 | BUG_ON(wc->shared_level < level); | |
6176 | if (level < wc->shared_level) | |
6177 | goto out; | |
6178 | ||
2c47e605 YZ |
6179 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6180 | if (ret > 0) | |
6181 | wc->update_ref = 0; | |
6182 | ||
6183 | wc->stage = DROP_REFERENCE; | |
6184 | wc->shared_level = -1; | |
6185 | path->slots[level] = 0; | |
6186 | ||
6187 | /* | |
6188 | * check reference count again if the block isn't locked. | |
6189 | * we should start walking down the tree again if reference | |
6190 | * count is one. | |
6191 | */ | |
6192 | if (!path->locks[level]) { | |
6193 | BUG_ON(level == 0); | |
6194 | btrfs_tree_lock(eb); | |
6195 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6196 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6197 | |
6198 | ret = btrfs_lookup_extent_info(trans, root, | |
6199 | eb->start, eb->len, | |
6200 | &wc->refs[level], | |
6201 | &wc->flags[level]); | |
f82d02d9 | 6202 | BUG_ON(ret); |
2c47e605 YZ |
6203 | BUG_ON(wc->refs[level] == 0); |
6204 | if (wc->refs[level] == 1) { | |
bd681513 | 6205 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6206 | return 1; |
6207 | } | |
f82d02d9 | 6208 | } |
2c47e605 | 6209 | } |
f82d02d9 | 6210 | |
2c47e605 YZ |
6211 | /* wc->stage == DROP_REFERENCE */ |
6212 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 6213 | |
2c47e605 YZ |
6214 | if (wc->refs[level] == 1) { |
6215 | if (level == 0) { | |
6216 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6217 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
6218 | else | |
6219 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
6220 | BUG_ON(ret); | |
6221 | } | |
6222 | /* make block locked assertion in clean_tree_block happy */ | |
6223 | if (!path->locks[level] && | |
6224 | btrfs_header_generation(eb) == trans->transid) { | |
6225 | btrfs_tree_lock(eb); | |
6226 | btrfs_set_lock_blocking(eb); | |
bd681513 | 6227 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6228 | } |
6229 | clean_tree_block(trans, root, eb); | |
6230 | } | |
6231 | ||
6232 | if (eb == root->node) { | |
6233 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6234 | parent = eb->start; | |
6235 | else | |
6236 | BUG_ON(root->root_key.objectid != | |
6237 | btrfs_header_owner(eb)); | |
6238 | } else { | |
6239 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
6240 | parent = path->nodes[level + 1]->start; | |
6241 | else | |
6242 | BUG_ON(root->root_key.objectid != | |
6243 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 6244 | } |
f82d02d9 | 6245 | |
f0486c68 | 6246 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
6247 | out: |
6248 | wc->refs[level] = 0; | |
6249 | wc->flags[level] = 0; | |
f0486c68 | 6250 | return 0; |
2c47e605 YZ |
6251 | } |
6252 | ||
6253 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
6254 | struct btrfs_root *root, | |
6255 | struct btrfs_path *path, | |
6256 | struct walk_control *wc) | |
6257 | { | |
2c47e605 | 6258 | int level = wc->level; |
94fcca9f | 6259 | int lookup_info = 1; |
2c47e605 YZ |
6260 | int ret; |
6261 | ||
6262 | while (level >= 0) { | |
94fcca9f | 6263 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
6264 | if (ret > 0) |
6265 | break; | |
6266 | ||
6267 | if (level == 0) | |
6268 | break; | |
6269 | ||
7a7965f8 YZ |
6270 | if (path->slots[level] >= |
6271 | btrfs_header_nritems(path->nodes[level])) | |
6272 | break; | |
6273 | ||
94fcca9f | 6274 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
6275 | if (ret > 0) { |
6276 | path->slots[level]++; | |
6277 | continue; | |
90d2c51d MX |
6278 | } else if (ret < 0) |
6279 | return ret; | |
1c4850e2 | 6280 | level = wc->level; |
f82d02d9 | 6281 | } |
f82d02d9 YZ |
6282 | return 0; |
6283 | } | |
6284 | ||
d397712b | 6285 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 6286 | struct btrfs_root *root, |
f82d02d9 | 6287 | struct btrfs_path *path, |
2c47e605 | 6288 | struct walk_control *wc, int max_level) |
20524f02 | 6289 | { |
2c47e605 | 6290 | int level = wc->level; |
20524f02 | 6291 | int ret; |
9f3a7427 | 6292 | |
2c47e605 YZ |
6293 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
6294 | while (level < max_level && path->nodes[level]) { | |
6295 | wc->level = level; | |
6296 | if (path->slots[level] + 1 < | |
6297 | btrfs_header_nritems(path->nodes[level])) { | |
6298 | path->slots[level]++; | |
20524f02 CM |
6299 | return 0; |
6300 | } else { | |
2c47e605 YZ |
6301 | ret = walk_up_proc(trans, root, path, wc); |
6302 | if (ret > 0) | |
6303 | return 0; | |
bd56b302 | 6304 | |
2c47e605 | 6305 | if (path->locks[level]) { |
bd681513 CM |
6306 | btrfs_tree_unlock_rw(path->nodes[level], |
6307 | path->locks[level]); | |
2c47e605 | 6308 | path->locks[level] = 0; |
f82d02d9 | 6309 | } |
2c47e605 YZ |
6310 | free_extent_buffer(path->nodes[level]); |
6311 | path->nodes[level] = NULL; | |
6312 | level++; | |
20524f02 CM |
6313 | } |
6314 | } | |
6315 | return 1; | |
6316 | } | |
6317 | ||
9aca1d51 | 6318 | /* |
2c47e605 YZ |
6319 | * drop a subvolume tree. |
6320 | * | |
6321 | * this function traverses the tree freeing any blocks that only | |
6322 | * referenced by the tree. | |
6323 | * | |
6324 | * when a shared tree block is found. this function decreases its | |
6325 | * reference count by one. if update_ref is true, this function | |
6326 | * also make sure backrefs for the shared block and all lower level | |
6327 | * blocks are properly updated. | |
9aca1d51 | 6328 | */ |
cb1b69f4 TI |
6329 | void btrfs_drop_snapshot(struct btrfs_root *root, |
6330 | struct btrfs_block_rsv *block_rsv, int update_ref) | |
20524f02 | 6331 | { |
5caf2a00 | 6332 | struct btrfs_path *path; |
2c47e605 YZ |
6333 | struct btrfs_trans_handle *trans; |
6334 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 6335 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
6336 | struct walk_control *wc; |
6337 | struct btrfs_key key; | |
6338 | int err = 0; | |
6339 | int ret; | |
6340 | int level; | |
20524f02 | 6341 | |
5caf2a00 | 6342 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
6343 | if (!path) { |
6344 | err = -ENOMEM; | |
6345 | goto out; | |
6346 | } | |
20524f02 | 6347 | |
2c47e605 | 6348 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
6349 | if (!wc) { |
6350 | btrfs_free_path(path); | |
cb1b69f4 TI |
6351 | err = -ENOMEM; |
6352 | goto out; | |
38a1a919 | 6353 | } |
2c47e605 | 6354 | |
a22285a6 | 6355 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 TI |
6356 | BUG_ON(IS_ERR(trans)); |
6357 | ||
3fd0a558 YZ |
6358 | if (block_rsv) |
6359 | trans->block_rsv = block_rsv; | |
2c47e605 | 6360 | |
9f3a7427 | 6361 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 6362 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
6363 | path->nodes[level] = btrfs_lock_root_node(root); |
6364 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 6365 | path->slots[level] = 0; |
bd681513 | 6366 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6367 | memset(&wc->update_progress, 0, |
6368 | sizeof(wc->update_progress)); | |
9f3a7427 | 6369 | } else { |
9f3a7427 | 6370 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
6371 | memcpy(&wc->update_progress, &key, |
6372 | sizeof(wc->update_progress)); | |
6373 | ||
6702ed49 | 6374 | level = root_item->drop_level; |
2c47e605 | 6375 | BUG_ON(level == 0); |
6702ed49 | 6376 | path->lowest_level = level; |
2c47e605 YZ |
6377 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6378 | path->lowest_level = 0; | |
6379 | if (ret < 0) { | |
6380 | err = ret; | |
cb1b69f4 | 6381 | goto out_free; |
9f3a7427 | 6382 | } |
1c4850e2 | 6383 | WARN_ON(ret > 0); |
2c47e605 | 6384 | |
7d9eb12c CM |
6385 | /* |
6386 | * unlock our path, this is safe because only this | |
6387 | * function is allowed to delete this snapshot | |
6388 | */ | |
5d4f98a2 | 6389 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
6390 | |
6391 | level = btrfs_header_level(root->node); | |
6392 | while (1) { | |
6393 | btrfs_tree_lock(path->nodes[level]); | |
6394 | btrfs_set_lock_blocking(path->nodes[level]); | |
6395 | ||
6396 | ret = btrfs_lookup_extent_info(trans, root, | |
6397 | path->nodes[level]->start, | |
6398 | path->nodes[level]->len, | |
6399 | &wc->refs[level], | |
6400 | &wc->flags[level]); | |
6401 | BUG_ON(ret); | |
6402 | BUG_ON(wc->refs[level] == 0); | |
6403 | ||
6404 | if (level == root_item->drop_level) | |
6405 | break; | |
6406 | ||
6407 | btrfs_tree_unlock(path->nodes[level]); | |
6408 | WARN_ON(wc->refs[level] != 1); | |
6409 | level--; | |
6410 | } | |
9f3a7427 | 6411 | } |
2c47e605 YZ |
6412 | |
6413 | wc->level = level; | |
6414 | wc->shared_level = -1; | |
6415 | wc->stage = DROP_REFERENCE; | |
6416 | wc->update_ref = update_ref; | |
6417 | wc->keep_locks = 0; | |
1c4850e2 | 6418 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 6419 | |
d397712b | 6420 | while (1) { |
2c47e605 YZ |
6421 | ret = walk_down_tree(trans, root, path, wc); |
6422 | if (ret < 0) { | |
6423 | err = ret; | |
20524f02 | 6424 | break; |
2c47e605 | 6425 | } |
9aca1d51 | 6426 | |
2c47e605 YZ |
6427 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
6428 | if (ret < 0) { | |
6429 | err = ret; | |
20524f02 | 6430 | break; |
2c47e605 YZ |
6431 | } |
6432 | ||
6433 | if (ret > 0) { | |
6434 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
6435 | break; |
6436 | } | |
2c47e605 YZ |
6437 | |
6438 | if (wc->stage == DROP_REFERENCE) { | |
6439 | level = wc->level; | |
6440 | btrfs_node_key(path->nodes[level], | |
6441 | &root_item->drop_progress, | |
6442 | path->slots[level]); | |
6443 | root_item->drop_level = level; | |
6444 | } | |
6445 | ||
6446 | BUG_ON(wc->level == 0); | |
3fd0a558 | 6447 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
6448 | ret = btrfs_update_root(trans, tree_root, |
6449 | &root->root_key, | |
6450 | root_item); | |
6451 | BUG_ON(ret); | |
6452 | ||
3fd0a558 | 6453 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 6454 | trans = btrfs_start_transaction(tree_root, 0); |
98d5dc13 | 6455 | BUG_ON(IS_ERR(trans)); |
3fd0a558 YZ |
6456 | if (block_rsv) |
6457 | trans->block_rsv = block_rsv; | |
c3e69d58 | 6458 | } |
20524f02 | 6459 | } |
b3b4aa74 | 6460 | btrfs_release_path(path); |
2c47e605 YZ |
6461 | BUG_ON(err); |
6462 | ||
6463 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
6464 | BUG_ON(ret); | |
6465 | ||
76dda93c YZ |
6466 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
6467 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
6468 | NULL, NULL); | |
6469 | BUG_ON(ret < 0); | |
6470 | if (ret > 0) { | |
84cd948c JB |
6471 | /* if we fail to delete the orphan item this time |
6472 | * around, it'll get picked up the next time. | |
6473 | * | |
6474 | * The most common failure here is just -ENOENT. | |
6475 | */ | |
6476 | btrfs_del_orphan_item(trans, tree_root, | |
6477 | root->root_key.objectid); | |
76dda93c YZ |
6478 | } |
6479 | } | |
6480 | ||
6481 | if (root->in_radix) { | |
6482 | btrfs_free_fs_root(tree_root->fs_info, root); | |
6483 | } else { | |
6484 | free_extent_buffer(root->node); | |
6485 | free_extent_buffer(root->commit_root); | |
6486 | kfree(root); | |
6487 | } | |
cb1b69f4 | 6488 | out_free: |
3fd0a558 | 6489 | btrfs_end_transaction_throttle(trans, tree_root); |
2c47e605 | 6490 | kfree(wc); |
5caf2a00 | 6491 | btrfs_free_path(path); |
cb1b69f4 TI |
6492 | out: |
6493 | if (err) | |
6494 | btrfs_std_error(root->fs_info, err); | |
6495 | return; | |
20524f02 | 6496 | } |
9078a3e1 | 6497 | |
2c47e605 YZ |
6498 | /* |
6499 | * drop subtree rooted at tree block 'node'. | |
6500 | * | |
6501 | * NOTE: this function will unlock and release tree block 'node' | |
6502 | */ | |
f82d02d9 YZ |
6503 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
6504 | struct btrfs_root *root, | |
6505 | struct extent_buffer *node, | |
6506 | struct extent_buffer *parent) | |
6507 | { | |
6508 | struct btrfs_path *path; | |
2c47e605 | 6509 | struct walk_control *wc; |
f82d02d9 YZ |
6510 | int level; |
6511 | int parent_level; | |
6512 | int ret = 0; | |
6513 | int wret; | |
6514 | ||
2c47e605 YZ |
6515 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
6516 | ||
f82d02d9 | 6517 | path = btrfs_alloc_path(); |
db5b493a TI |
6518 | if (!path) |
6519 | return -ENOMEM; | |
f82d02d9 | 6520 | |
2c47e605 | 6521 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
6522 | if (!wc) { |
6523 | btrfs_free_path(path); | |
6524 | return -ENOMEM; | |
6525 | } | |
2c47e605 | 6526 | |
b9447ef8 | 6527 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
6528 | parent_level = btrfs_header_level(parent); |
6529 | extent_buffer_get(parent); | |
6530 | path->nodes[parent_level] = parent; | |
6531 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
6532 | ||
b9447ef8 | 6533 | btrfs_assert_tree_locked(node); |
f82d02d9 | 6534 | level = btrfs_header_level(node); |
f82d02d9 YZ |
6535 | path->nodes[level] = node; |
6536 | path->slots[level] = 0; | |
bd681513 | 6537 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
6538 | |
6539 | wc->refs[parent_level] = 1; | |
6540 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6541 | wc->level = level; | |
6542 | wc->shared_level = -1; | |
6543 | wc->stage = DROP_REFERENCE; | |
6544 | wc->update_ref = 0; | |
6545 | wc->keep_locks = 1; | |
1c4850e2 | 6546 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
6547 | |
6548 | while (1) { | |
2c47e605 YZ |
6549 | wret = walk_down_tree(trans, root, path, wc); |
6550 | if (wret < 0) { | |
f82d02d9 | 6551 | ret = wret; |
f82d02d9 | 6552 | break; |
2c47e605 | 6553 | } |
f82d02d9 | 6554 | |
2c47e605 | 6555 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
6556 | if (wret < 0) |
6557 | ret = wret; | |
6558 | if (wret != 0) | |
6559 | break; | |
6560 | } | |
6561 | ||
2c47e605 | 6562 | kfree(wc); |
f82d02d9 YZ |
6563 | btrfs_free_path(path); |
6564 | return ret; | |
6565 | } | |
6566 | ||
ec44a35c CM |
6567 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
6568 | { | |
6569 | u64 num_devices; | |
6570 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
6571 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
6572 | ||
cd02dca5 CM |
6573 | /* |
6574 | * we add in the count of missing devices because we want | |
6575 | * to make sure that any RAID levels on a degraded FS | |
6576 | * continue to be honored. | |
6577 | */ | |
6578 | num_devices = root->fs_info->fs_devices->rw_devices + | |
6579 | root->fs_info->fs_devices->missing_devices; | |
6580 | ||
ec44a35c CM |
6581 | if (num_devices == 1) { |
6582 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6583 | stripped = flags & ~stripped; | |
6584 | ||
6585 | /* turn raid0 into single device chunks */ | |
6586 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
6587 | return stripped; | |
6588 | ||
6589 | /* turn mirroring into duplication */ | |
6590 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6591 | BTRFS_BLOCK_GROUP_RAID10)) | |
6592 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
6593 | return flags; | |
6594 | } else { | |
6595 | /* they already had raid on here, just return */ | |
ec44a35c CM |
6596 | if (flags & stripped) |
6597 | return flags; | |
6598 | ||
6599 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
6600 | stripped = flags & ~stripped; | |
6601 | ||
6602 | /* switch duplicated blocks with raid1 */ | |
6603 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
6604 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
6605 | ||
6606 | /* turn single device chunks into raid0 */ | |
6607 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
6608 | } | |
6609 | return flags; | |
6610 | } | |
6611 | ||
199c36ea | 6612 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 6613 | { |
f0486c68 YZ |
6614 | struct btrfs_space_info *sinfo = cache->space_info; |
6615 | u64 num_bytes; | |
199c36ea | 6616 | u64 min_allocable_bytes; |
f0486c68 | 6617 | int ret = -ENOSPC; |
0ef3e66b | 6618 | |
c286ac48 | 6619 | |
199c36ea MX |
6620 | /* |
6621 | * We need some metadata space and system metadata space for | |
6622 | * allocating chunks in some corner cases until we force to set | |
6623 | * it to be readonly. | |
6624 | */ | |
6625 | if ((sinfo->flags & | |
6626 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
6627 | !force) | |
6628 | min_allocable_bytes = 1 * 1024 * 1024; | |
6629 | else | |
6630 | min_allocable_bytes = 0; | |
6631 | ||
f0486c68 YZ |
6632 | spin_lock(&sinfo->lock); |
6633 | spin_lock(&cache->lock); | |
61cfea9b W |
6634 | |
6635 | if (cache->ro) { | |
6636 | ret = 0; | |
6637 | goto out; | |
6638 | } | |
6639 | ||
f0486c68 YZ |
6640 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
6641 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6642 | ||
6643 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
6644 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
6645 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 6646 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
6647 | cache->ro = 1; |
6648 | ret = 0; | |
6649 | } | |
61cfea9b | 6650 | out: |
f0486c68 YZ |
6651 | spin_unlock(&cache->lock); |
6652 | spin_unlock(&sinfo->lock); | |
6653 | return ret; | |
6654 | } | |
7d9eb12c | 6655 | |
f0486c68 YZ |
6656 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
6657 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 6658 | |
f0486c68 YZ |
6659 | { |
6660 | struct btrfs_trans_handle *trans; | |
6661 | u64 alloc_flags; | |
6662 | int ret; | |
7d9eb12c | 6663 | |
f0486c68 | 6664 | BUG_ON(cache->ro); |
0ef3e66b | 6665 | |
ff5714cc | 6666 | trans = btrfs_join_transaction(root); |
f0486c68 | 6667 | BUG_ON(IS_ERR(trans)); |
5d4f98a2 | 6668 | |
f0486c68 YZ |
6669 | alloc_flags = update_block_group_flags(root, cache->flags); |
6670 | if (alloc_flags != cache->flags) | |
0e4f8f88 CM |
6671 | do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6672 | CHUNK_ALLOC_FORCE); | |
5d4f98a2 | 6673 | |
199c36ea | 6674 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
6675 | if (!ret) |
6676 | goto out; | |
6677 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
0e4f8f88 CM |
6678 | ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6679 | CHUNK_ALLOC_FORCE); | |
f0486c68 YZ |
6680 | if (ret < 0) |
6681 | goto out; | |
199c36ea | 6682 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
6683 | out: |
6684 | btrfs_end_transaction(trans, root); | |
6685 | return ret; | |
6686 | } | |
5d4f98a2 | 6687 | |
c87f08ca CM |
6688 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
6689 | struct btrfs_root *root, u64 type) | |
6690 | { | |
6691 | u64 alloc_flags = get_alloc_profile(root, type); | |
0e4f8f88 CM |
6692 | return do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, |
6693 | CHUNK_ALLOC_FORCE); | |
c87f08ca CM |
6694 | } |
6695 | ||
6d07bcec MX |
6696 | /* |
6697 | * helper to account the unused space of all the readonly block group in the | |
6698 | * list. takes mirrors into account. | |
6699 | */ | |
6700 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
6701 | { | |
6702 | struct btrfs_block_group_cache *block_group; | |
6703 | u64 free_bytes = 0; | |
6704 | int factor; | |
6705 | ||
6706 | list_for_each_entry(block_group, groups_list, list) { | |
6707 | spin_lock(&block_group->lock); | |
6708 | ||
6709 | if (!block_group->ro) { | |
6710 | spin_unlock(&block_group->lock); | |
6711 | continue; | |
6712 | } | |
6713 | ||
6714 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
6715 | BTRFS_BLOCK_GROUP_RAID10 | | |
6716 | BTRFS_BLOCK_GROUP_DUP)) | |
6717 | factor = 2; | |
6718 | else | |
6719 | factor = 1; | |
6720 | ||
6721 | free_bytes += (block_group->key.offset - | |
6722 | btrfs_block_group_used(&block_group->item)) * | |
6723 | factor; | |
6724 | ||
6725 | spin_unlock(&block_group->lock); | |
6726 | } | |
6727 | ||
6728 | return free_bytes; | |
6729 | } | |
6730 | ||
6731 | /* | |
6732 | * helper to account the unused space of all the readonly block group in the | |
6733 | * space_info. takes mirrors into account. | |
6734 | */ | |
6735 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
6736 | { | |
6737 | int i; | |
6738 | u64 free_bytes = 0; | |
6739 | ||
6740 | spin_lock(&sinfo->lock); | |
6741 | ||
6742 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
6743 | if (!list_empty(&sinfo->block_groups[i])) | |
6744 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
6745 | &sinfo->block_groups[i]); | |
6746 | ||
6747 | spin_unlock(&sinfo->lock); | |
6748 | ||
6749 | return free_bytes; | |
6750 | } | |
6751 | ||
f0486c68 YZ |
6752 | int btrfs_set_block_group_rw(struct btrfs_root *root, |
6753 | struct btrfs_block_group_cache *cache) | |
5d4f98a2 | 6754 | { |
f0486c68 YZ |
6755 | struct btrfs_space_info *sinfo = cache->space_info; |
6756 | u64 num_bytes; | |
6757 | ||
6758 | BUG_ON(!cache->ro); | |
6759 | ||
6760 | spin_lock(&sinfo->lock); | |
6761 | spin_lock(&cache->lock); | |
6762 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
6763 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
6764 | sinfo->bytes_readonly -= num_bytes; | |
6765 | cache->ro = 0; | |
6766 | spin_unlock(&cache->lock); | |
6767 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
6768 | return 0; |
6769 | } | |
6770 | ||
ba1bf481 JB |
6771 | /* |
6772 | * checks to see if its even possible to relocate this block group. | |
6773 | * | |
6774 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
6775 | * ok to go ahead and try. | |
6776 | */ | |
6777 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 6778 | { |
ba1bf481 JB |
6779 | struct btrfs_block_group_cache *block_group; |
6780 | struct btrfs_space_info *space_info; | |
6781 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
6782 | struct btrfs_device *device; | |
cdcb725c | 6783 | u64 min_free; |
6719db6a JB |
6784 | u64 dev_min = 1; |
6785 | u64 dev_nr = 0; | |
cdcb725c | 6786 | int index; |
ba1bf481 JB |
6787 | int full = 0; |
6788 | int ret = 0; | |
1a40e23b | 6789 | |
ba1bf481 | 6790 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 6791 | |
ba1bf481 JB |
6792 | /* odd, couldn't find the block group, leave it alone */ |
6793 | if (!block_group) | |
6794 | return -1; | |
1a40e23b | 6795 | |
cdcb725c | 6796 | min_free = btrfs_block_group_used(&block_group->item); |
6797 | ||
ba1bf481 | 6798 | /* no bytes used, we're good */ |
cdcb725c | 6799 | if (!min_free) |
1a40e23b ZY |
6800 | goto out; |
6801 | ||
ba1bf481 JB |
6802 | space_info = block_group->space_info; |
6803 | spin_lock(&space_info->lock); | |
17d217fe | 6804 | |
ba1bf481 | 6805 | full = space_info->full; |
17d217fe | 6806 | |
ba1bf481 JB |
6807 | /* |
6808 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
6809 | * relocate it unless we're able to allocate a new chunk below. |
6810 | * | |
6811 | * Otherwise, we need to make sure we have room in the space to handle | |
6812 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 6813 | */ |
7ce618db | 6814 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 6815 | (space_info->bytes_used + space_info->bytes_reserved + |
6816 | space_info->bytes_pinned + space_info->bytes_readonly + | |
6817 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
6818 | spin_unlock(&space_info->lock); |
6819 | goto out; | |
17d217fe | 6820 | } |
ba1bf481 | 6821 | spin_unlock(&space_info->lock); |
ea8c2819 | 6822 | |
ba1bf481 JB |
6823 | /* |
6824 | * ok we don't have enough space, but maybe we have free space on our | |
6825 | * devices to allocate new chunks for relocation, so loop through our | |
6826 | * alloc devices and guess if we have enough space. However, if we | |
6827 | * were marked as full, then we know there aren't enough chunks, and we | |
6828 | * can just return. | |
6829 | */ | |
6830 | ret = -1; | |
6831 | if (full) | |
6832 | goto out; | |
ea8c2819 | 6833 | |
cdcb725c | 6834 | /* |
6835 | * index: | |
6836 | * 0: raid10 | |
6837 | * 1: raid1 | |
6838 | * 2: dup | |
6839 | * 3: raid0 | |
6840 | * 4: single | |
6841 | */ | |
6842 | index = get_block_group_index(block_group); | |
6843 | if (index == 0) { | |
6844 | dev_min = 4; | |
6719db6a JB |
6845 | /* Divide by 2 */ |
6846 | min_free >>= 1; | |
cdcb725c | 6847 | } else if (index == 1) { |
6848 | dev_min = 2; | |
6849 | } else if (index == 2) { | |
6719db6a JB |
6850 | /* Multiply by 2 */ |
6851 | min_free <<= 1; | |
cdcb725c | 6852 | } else if (index == 3) { |
6853 | dev_min = fs_devices->rw_devices; | |
6719db6a | 6854 | do_div(min_free, dev_min); |
cdcb725c | 6855 | } |
6856 | ||
ba1bf481 JB |
6857 | mutex_lock(&root->fs_info->chunk_mutex); |
6858 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 6859 | u64 dev_offset; |
56bec294 | 6860 | |
ba1bf481 JB |
6861 | /* |
6862 | * check to make sure we can actually find a chunk with enough | |
6863 | * space to fit our block group in. | |
6864 | */ | |
6865 | if (device->total_bytes > device->bytes_used + min_free) { | |
6866 | ret = find_free_dev_extent(NULL, device, min_free, | |
7bfc837d | 6867 | &dev_offset, NULL); |
ba1bf481 | 6868 | if (!ret) |
cdcb725c | 6869 | dev_nr++; |
6870 | ||
6871 | if (dev_nr >= dev_min) | |
73e48b27 | 6872 | break; |
cdcb725c | 6873 | |
ba1bf481 | 6874 | ret = -1; |
725c8463 | 6875 | } |
edbd8d4e | 6876 | } |
ba1bf481 | 6877 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 6878 | out: |
ba1bf481 | 6879 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
6880 | return ret; |
6881 | } | |
6882 | ||
b2950863 CH |
6883 | static int find_first_block_group(struct btrfs_root *root, |
6884 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 6885 | { |
925baedd | 6886 | int ret = 0; |
0b86a832 CM |
6887 | struct btrfs_key found_key; |
6888 | struct extent_buffer *leaf; | |
6889 | int slot; | |
edbd8d4e | 6890 | |
0b86a832 CM |
6891 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
6892 | if (ret < 0) | |
925baedd CM |
6893 | goto out; |
6894 | ||
d397712b | 6895 | while (1) { |
0b86a832 | 6896 | slot = path->slots[0]; |
edbd8d4e | 6897 | leaf = path->nodes[0]; |
0b86a832 CM |
6898 | if (slot >= btrfs_header_nritems(leaf)) { |
6899 | ret = btrfs_next_leaf(root, path); | |
6900 | if (ret == 0) | |
6901 | continue; | |
6902 | if (ret < 0) | |
925baedd | 6903 | goto out; |
0b86a832 | 6904 | break; |
edbd8d4e | 6905 | } |
0b86a832 | 6906 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 6907 | |
0b86a832 | 6908 | if (found_key.objectid >= key->objectid && |
925baedd CM |
6909 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
6910 | ret = 0; | |
6911 | goto out; | |
6912 | } | |
0b86a832 | 6913 | path->slots[0]++; |
edbd8d4e | 6914 | } |
925baedd | 6915 | out: |
0b86a832 | 6916 | return ret; |
edbd8d4e CM |
6917 | } |
6918 | ||
0af3d00b JB |
6919 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
6920 | { | |
6921 | struct btrfs_block_group_cache *block_group; | |
6922 | u64 last = 0; | |
6923 | ||
6924 | while (1) { | |
6925 | struct inode *inode; | |
6926 | ||
6927 | block_group = btrfs_lookup_first_block_group(info, last); | |
6928 | while (block_group) { | |
6929 | spin_lock(&block_group->lock); | |
6930 | if (block_group->iref) | |
6931 | break; | |
6932 | spin_unlock(&block_group->lock); | |
6933 | block_group = next_block_group(info->tree_root, | |
6934 | block_group); | |
6935 | } | |
6936 | if (!block_group) { | |
6937 | if (last == 0) | |
6938 | break; | |
6939 | last = 0; | |
6940 | continue; | |
6941 | } | |
6942 | ||
6943 | inode = block_group->inode; | |
6944 | block_group->iref = 0; | |
6945 | block_group->inode = NULL; | |
6946 | spin_unlock(&block_group->lock); | |
6947 | iput(inode); | |
6948 | last = block_group->key.objectid + block_group->key.offset; | |
6949 | btrfs_put_block_group(block_group); | |
6950 | } | |
6951 | } | |
6952 | ||
1a40e23b ZY |
6953 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
6954 | { | |
6955 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 6956 | struct btrfs_space_info *space_info; |
11833d66 | 6957 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
6958 | struct rb_node *n; |
6959 | ||
11833d66 YZ |
6960 | down_write(&info->extent_commit_sem); |
6961 | while (!list_empty(&info->caching_block_groups)) { | |
6962 | caching_ctl = list_entry(info->caching_block_groups.next, | |
6963 | struct btrfs_caching_control, list); | |
6964 | list_del(&caching_ctl->list); | |
6965 | put_caching_control(caching_ctl); | |
6966 | } | |
6967 | up_write(&info->extent_commit_sem); | |
6968 | ||
1a40e23b ZY |
6969 | spin_lock(&info->block_group_cache_lock); |
6970 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
6971 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
6972 | cache_node); | |
1a40e23b ZY |
6973 | rb_erase(&block_group->cache_node, |
6974 | &info->block_group_cache_tree); | |
d899e052 YZ |
6975 | spin_unlock(&info->block_group_cache_lock); |
6976 | ||
80eb234a | 6977 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 6978 | list_del(&block_group->list); |
80eb234a | 6979 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 6980 | |
817d52f8 | 6981 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 6982 | wait_block_group_cache_done(block_group); |
817d52f8 | 6983 | |
3c14874a JB |
6984 | /* |
6985 | * We haven't cached this block group, which means we could | |
6986 | * possibly have excluded extents on this block group. | |
6987 | */ | |
6988 | if (block_group->cached == BTRFS_CACHE_NO) | |
6989 | free_excluded_extents(info->extent_root, block_group); | |
6990 | ||
817d52f8 | 6991 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 6992 | btrfs_put_block_group(block_group); |
d899e052 YZ |
6993 | |
6994 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
6995 | } |
6996 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
6997 | |
6998 | /* now that all the block groups are freed, go through and | |
6999 | * free all the space_info structs. This is only called during | |
7000 | * the final stages of unmount, and so we know nobody is | |
7001 | * using them. We call synchronize_rcu() once before we start, | |
7002 | * just to be on the safe side. | |
7003 | */ | |
7004 | synchronize_rcu(); | |
7005 | ||
8929ecfa YZ |
7006 | release_global_block_rsv(info); |
7007 | ||
4184ea7f CM |
7008 | while(!list_empty(&info->space_info)) { |
7009 | space_info = list_entry(info->space_info.next, | |
7010 | struct btrfs_space_info, | |
7011 | list); | |
f0486c68 | 7012 | if (space_info->bytes_pinned > 0 || |
fb25e914 JB |
7013 | space_info->bytes_reserved > 0 || |
7014 | space_info->bytes_may_use > 0) { | |
f0486c68 YZ |
7015 | WARN_ON(1); |
7016 | dump_space_info(space_info, 0, 0); | |
7017 | } | |
4184ea7f CM |
7018 | list_del(&space_info->list); |
7019 | kfree(space_info); | |
7020 | } | |
1a40e23b ZY |
7021 | return 0; |
7022 | } | |
7023 | ||
b742bb82 YZ |
7024 | static void __link_block_group(struct btrfs_space_info *space_info, |
7025 | struct btrfs_block_group_cache *cache) | |
7026 | { | |
7027 | int index = get_block_group_index(cache); | |
7028 | ||
7029 | down_write(&space_info->groups_sem); | |
7030 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
7031 | up_write(&space_info->groups_sem); | |
7032 | } | |
7033 | ||
9078a3e1 CM |
7034 | int btrfs_read_block_groups(struct btrfs_root *root) |
7035 | { | |
7036 | struct btrfs_path *path; | |
7037 | int ret; | |
9078a3e1 | 7038 | struct btrfs_block_group_cache *cache; |
be744175 | 7039 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7040 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7041 | struct btrfs_key key; |
7042 | struct btrfs_key found_key; | |
5f39d397 | 7043 | struct extent_buffer *leaf; |
0af3d00b JB |
7044 | int need_clear = 0; |
7045 | u64 cache_gen; | |
96b5179d | 7046 | |
be744175 | 7047 | root = info->extent_root; |
9078a3e1 | 7048 | key.objectid = 0; |
0b86a832 | 7049 | key.offset = 0; |
9078a3e1 | 7050 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7051 | path = btrfs_alloc_path(); |
7052 | if (!path) | |
7053 | return -ENOMEM; | |
026fd317 | 7054 | path->reada = 1; |
9078a3e1 | 7055 | |
0af3d00b | 7056 | cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy); |
73bc1876 | 7057 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
7058 | btrfs_super_generation(&root->fs_info->super_copy) != cache_gen) |
7059 | need_clear = 1; | |
88c2ba3b JB |
7060 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
7061 | need_clear = 1; | |
0af3d00b | 7062 | |
d397712b | 7063 | while (1) { |
0b86a832 | 7064 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
7065 | if (ret > 0) |
7066 | break; | |
0b86a832 CM |
7067 | if (ret != 0) |
7068 | goto error; | |
5f39d397 CM |
7069 | leaf = path->nodes[0]; |
7070 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7071 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7072 | if (!cache) { |
0b86a832 | 7073 | ret = -ENOMEM; |
f0486c68 | 7074 | goto error; |
9078a3e1 | 7075 | } |
34d52cb6 LZ |
7076 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7077 | GFP_NOFS); | |
7078 | if (!cache->free_space_ctl) { | |
7079 | kfree(cache); | |
7080 | ret = -ENOMEM; | |
7081 | goto error; | |
7082 | } | |
3e1ad54f | 7083 | |
d2fb3437 | 7084 | atomic_set(&cache->count, 1); |
c286ac48 | 7085 | spin_lock_init(&cache->lock); |
817d52f8 | 7086 | cache->fs_info = info; |
0f9dd46c | 7087 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7088 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 7089 | |
0af3d00b JB |
7090 | if (need_clear) |
7091 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
7092 | ||
5f39d397 CM |
7093 | read_extent_buffer(leaf, &cache->item, |
7094 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7095 | sizeof(cache->item)); | |
9078a3e1 | 7096 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7097 | |
9078a3e1 | 7098 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 7099 | btrfs_release_path(path); |
0b86a832 | 7100 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 JB |
7101 | cache->sectorsize = root->sectorsize; |
7102 | ||
34d52cb6 LZ |
7103 | btrfs_init_free_space_ctl(cache); |
7104 | ||
3c14874a JB |
7105 | /* |
7106 | * We need to exclude the super stripes now so that the space | |
7107 | * info has super bytes accounted for, otherwise we'll think | |
7108 | * we have more space than we actually do. | |
7109 | */ | |
7110 | exclude_super_stripes(root, cache); | |
7111 | ||
817d52f8 JB |
7112 | /* |
7113 | * check for two cases, either we are full, and therefore | |
7114 | * don't need to bother with the caching work since we won't | |
7115 | * find any space, or we are empty, and we can just add all | |
7116 | * the space in and be done with it. This saves us _alot_ of | |
7117 | * time, particularly in the full case. | |
7118 | */ | |
7119 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 7120 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7121 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 7122 | free_excluded_extents(root, cache); |
817d52f8 | 7123 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 7124 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
7125 | cache->cached = BTRFS_CACHE_FINISHED; |
7126 | add_new_free_space(cache, root->fs_info, | |
7127 | found_key.objectid, | |
7128 | found_key.objectid + | |
7129 | found_key.offset); | |
11833d66 | 7130 | free_excluded_extents(root, cache); |
817d52f8 | 7131 | } |
96b5179d | 7132 | |
6324fbf3 CM |
7133 | ret = update_space_info(info, cache->flags, found_key.offset, |
7134 | btrfs_block_group_used(&cache->item), | |
7135 | &space_info); | |
7136 | BUG_ON(ret); | |
7137 | cache->space_info = space_info; | |
1b2da372 | 7138 | spin_lock(&cache->space_info->lock); |
f0486c68 | 7139 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7140 | spin_unlock(&cache->space_info->lock); |
7141 | ||
b742bb82 | 7142 | __link_block_group(space_info, cache); |
0f9dd46c JB |
7143 | |
7144 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
7145 | BUG_ON(ret); | |
75ccf47d CM |
7146 | |
7147 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 7148 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 7149 | set_block_group_ro(cache, 1); |
9078a3e1 | 7150 | } |
b742bb82 YZ |
7151 | |
7152 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
7153 | if (!(get_alloc_profile(root, space_info->flags) & | |
7154 | (BTRFS_BLOCK_GROUP_RAID10 | | |
7155 | BTRFS_BLOCK_GROUP_RAID1 | | |
7156 | BTRFS_BLOCK_GROUP_DUP))) | |
7157 | continue; | |
7158 | /* | |
7159 | * avoid allocating from un-mirrored block group if there are | |
7160 | * mirrored block groups. | |
7161 | */ | |
7162 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 7163 | set_block_group_ro(cache, 1); |
b742bb82 | 7164 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 7165 | set_block_group_ro(cache, 1); |
9078a3e1 | 7166 | } |
f0486c68 YZ |
7167 | |
7168 | init_global_block_rsv(info); | |
0b86a832 CM |
7169 | ret = 0; |
7170 | error: | |
9078a3e1 | 7171 | btrfs_free_path(path); |
0b86a832 | 7172 | return ret; |
9078a3e1 | 7173 | } |
6324fbf3 CM |
7174 | |
7175 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
7176 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 7177 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
7178 | u64 size) |
7179 | { | |
7180 | int ret; | |
6324fbf3 CM |
7181 | struct btrfs_root *extent_root; |
7182 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
7183 | |
7184 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 7185 | |
12fcfd22 | 7186 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 7187 | |
8f18cf13 | 7188 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
7189 | if (!cache) |
7190 | return -ENOMEM; | |
34d52cb6 LZ |
7191 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7192 | GFP_NOFS); | |
7193 | if (!cache->free_space_ctl) { | |
7194 | kfree(cache); | |
7195 | return -ENOMEM; | |
7196 | } | |
0f9dd46c | 7197 | |
e17cade2 | 7198 | cache->key.objectid = chunk_offset; |
6324fbf3 | 7199 | cache->key.offset = size; |
d2fb3437 | 7200 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 7201 | cache->sectorsize = root->sectorsize; |
0af3d00b | 7202 | cache->fs_info = root->fs_info; |
96303081 | 7203 | |
d2fb3437 | 7204 | atomic_set(&cache->count, 1); |
c286ac48 | 7205 | spin_lock_init(&cache->lock); |
0f9dd46c | 7206 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7207 | INIT_LIST_HEAD(&cache->cluster_list); |
0ef3e66b | 7208 | |
34d52cb6 LZ |
7209 | btrfs_init_free_space_ctl(cache); |
7210 | ||
6324fbf3 | 7211 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
7212 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
7213 | cache->flags = type; | |
7214 | btrfs_set_block_group_flags(&cache->item, type); | |
7215 | ||
11833d66 | 7216 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 7217 | cache->cached = BTRFS_CACHE_FINISHED; |
11833d66 | 7218 | exclude_super_stripes(root, cache); |
96303081 | 7219 | |
817d52f8 JB |
7220 | add_new_free_space(cache, root->fs_info, chunk_offset, |
7221 | chunk_offset + size); | |
7222 | ||
11833d66 YZ |
7223 | free_excluded_extents(root, cache); |
7224 | ||
6324fbf3 CM |
7225 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
7226 | &cache->space_info); | |
7227 | BUG_ON(ret); | |
1b2da372 JB |
7228 | |
7229 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 7230 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
7231 | spin_unlock(&cache->space_info->lock); |
7232 | ||
b742bb82 | 7233 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 7234 | |
0f9dd46c JB |
7235 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
7236 | BUG_ON(ret); | |
c286ac48 | 7237 | |
6324fbf3 CM |
7238 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
7239 | sizeof(cache->item)); | |
7240 | BUG_ON(ret); | |
7241 | ||
d18a2c44 | 7242 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 7243 | |
6324fbf3 CM |
7244 | return 0; |
7245 | } | |
1a40e23b ZY |
7246 | |
7247 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
7248 | struct btrfs_root *root, u64 group_start) | |
7249 | { | |
7250 | struct btrfs_path *path; | |
7251 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 7252 | struct btrfs_free_cluster *cluster; |
0af3d00b | 7253 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 7254 | struct btrfs_key key; |
0af3d00b | 7255 | struct inode *inode; |
1a40e23b | 7256 | int ret; |
89a55897 | 7257 | int factor; |
1a40e23b | 7258 | |
1a40e23b ZY |
7259 | root = root->fs_info->extent_root; |
7260 | ||
7261 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
7262 | BUG_ON(!block_group); | |
c146afad | 7263 | BUG_ON(!block_group->ro); |
1a40e23b | 7264 | |
9f7c43c9 | 7265 | /* |
7266 | * Free the reserved super bytes from this block group before | |
7267 | * remove it. | |
7268 | */ | |
7269 | free_excluded_extents(root, block_group); | |
7270 | ||
1a40e23b | 7271 | memcpy(&key, &block_group->key, sizeof(key)); |
89a55897 JB |
7272 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
7273 | BTRFS_BLOCK_GROUP_RAID1 | | |
7274 | BTRFS_BLOCK_GROUP_RAID10)) | |
7275 | factor = 2; | |
7276 | else | |
7277 | factor = 1; | |
1a40e23b | 7278 | |
44fb5511 CM |
7279 | /* make sure this block group isn't part of an allocation cluster */ |
7280 | cluster = &root->fs_info->data_alloc_cluster; | |
7281 | spin_lock(&cluster->refill_lock); | |
7282 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7283 | spin_unlock(&cluster->refill_lock); | |
7284 | ||
7285 | /* | |
7286 | * make sure this block group isn't part of a metadata | |
7287 | * allocation cluster | |
7288 | */ | |
7289 | cluster = &root->fs_info->meta_alloc_cluster; | |
7290 | spin_lock(&cluster->refill_lock); | |
7291 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
7292 | spin_unlock(&cluster->refill_lock); | |
7293 | ||
1a40e23b | 7294 | path = btrfs_alloc_path(); |
d8926bb3 MF |
7295 | if (!path) { |
7296 | ret = -ENOMEM; | |
7297 | goto out; | |
7298 | } | |
1a40e23b | 7299 | |
0af3d00b JB |
7300 | inode = lookup_free_space_inode(root, block_group, path); |
7301 | if (!IS_ERR(inode)) { | |
b532402e TI |
7302 | ret = btrfs_orphan_add(trans, inode); |
7303 | BUG_ON(ret); | |
0af3d00b JB |
7304 | clear_nlink(inode); |
7305 | /* One for the block groups ref */ | |
7306 | spin_lock(&block_group->lock); | |
7307 | if (block_group->iref) { | |
7308 | block_group->iref = 0; | |
7309 | block_group->inode = NULL; | |
7310 | spin_unlock(&block_group->lock); | |
7311 | iput(inode); | |
7312 | } else { | |
7313 | spin_unlock(&block_group->lock); | |
7314 | } | |
7315 | /* One for our lookup ref */ | |
455757c3 | 7316 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
7317 | } |
7318 | ||
7319 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
7320 | key.offset = block_group->key.objectid; | |
7321 | key.type = 0; | |
7322 | ||
7323 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
7324 | if (ret < 0) | |
7325 | goto out; | |
7326 | if (ret > 0) | |
b3b4aa74 | 7327 | btrfs_release_path(path); |
0af3d00b JB |
7328 | if (ret == 0) { |
7329 | ret = btrfs_del_item(trans, tree_root, path); | |
7330 | if (ret) | |
7331 | goto out; | |
b3b4aa74 | 7332 | btrfs_release_path(path); |
0af3d00b JB |
7333 | } |
7334 | ||
3dfdb934 | 7335 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
7336 | rb_erase(&block_group->cache_node, |
7337 | &root->fs_info->block_group_cache_tree); | |
3dfdb934 | 7338 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 7339 | |
80eb234a | 7340 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
7341 | /* |
7342 | * we must use list_del_init so people can check to see if they | |
7343 | * are still on the list after taking the semaphore | |
7344 | */ | |
7345 | list_del_init(&block_group->list); | |
80eb234a | 7346 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 7347 | |
817d52f8 | 7348 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7349 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
7350 | |
7351 | btrfs_remove_free_space_cache(block_group); | |
7352 | ||
c146afad YZ |
7353 | spin_lock(&block_group->space_info->lock); |
7354 | block_group->space_info->total_bytes -= block_group->key.offset; | |
7355 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 7356 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 7357 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 7358 | |
0af3d00b JB |
7359 | memcpy(&key, &block_group->key, sizeof(key)); |
7360 | ||
283bb197 | 7361 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 7362 | |
fa9c0d79 CM |
7363 | btrfs_put_block_group(block_group); |
7364 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
7365 | |
7366 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
7367 | if (ret > 0) | |
7368 | ret = -EIO; | |
7369 | if (ret < 0) | |
7370 | goto out; | |
7371 | ||
7372 | ret = btrfs_del_item(trans, root, path); | |
7373 | out: | |
7374 | btrfs_free_path(path); | |
7375 | return ret; | |
7376 | } | |
acce952b | 7377 | |
c59021f8 | 7378 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
7379 | { | |
7380 | struct btrfs_space_info *space_info; | |
1aba86d6 | 7381 | struct btrfs_super_block *disk_super; |
7382 | u64 features; | |
7383 | u64 flags; | |
7384 | int mixed = 0; | |
c59021f8 | 7385 | int ret; |
7386 | ||
1aba86d6 | 7387 | disk_super = &fs_info->super_copy; |
7388 | if (!btrfs_super_root(disk_super)) | |
7389 | return 1; | |
c59021f8 | 7390 | |
1aba86d6 | 7391 | features = btrfs_super_incompat_flags(disk_super); |
7392 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
7393 | mixed = 1; | |
c59021f8 | 7394 | |
1aba86d6 | 7395 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
7396 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 7397 | if (ret) |
1aba86d6 | 7398 | goto out; |
c59021f8 | 7399 | |
1aba86d6 | 7400 | if (mixed) { |
7401 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
7402 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7403 | } else { | |
7404 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
7405 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7406 | if (ret) | |
7407 | goto out; | |
7408 | ||
7409 | flags = BTRFS_BLOCK_GROUP_DATA; | |
7410 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
7411 | } | |
7412 | out: | |
c59021f8 | 7413 | return ret; |
7414 | } | |
7415 | ||
acce952b | 7416 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
7417 | { | |
7418 | return unpin_extent_range(root, start, end); | |
7419 | } | |
7420 | ||
7421 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 7422 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 7423 | { |
5378e607 | 7424 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 7425 | } |
f7039b1d LD |
7426 | |
7427 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
7428 | { | |
7429 | struct btrfs_fs_info *fs_info = root->fs_info; | |
7430 | struct btrfs_block_group_cache *cache = NULL; | |
7431 | u64 group_trimmed; | |
7432 | u64 start; | |
7433 | u64 end; | |
7434 | u64 trimmed = 0; | |
7435 | int ret = 0; | |
7436 | ||
7437 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
7438 | ||
7439 | while (cache) { | |
7440 | if (cache->key.objectid >= (range->start + range->len)) { | |
7441 | btrfs_put_block_group(cache); | |
7442 | break; | |
7443 | } | |
7444 | ||
7445 | start = max(range->start, cache->key.objectid); | |
7446 | end = min(range->start + range->len, | |
7447 | cache->key.objectid + cache->key.offset); | |
7448 | ||
7449 | if (end - start >= range->minlen) { | |
7450 | if (!block_group_cache_done(cache)) { | |
7451 | ret = cache_block_group(cache, NULL, root, 0); | |
7452 | if (!ret) | |
7453 | wait_block_group_cache_done(cache); | |
7454 | } | |
7455 | ret = btrfs_trim_block_group(cache, | |
7456 | &group_trimmed, | |
7457 | start, | |
7458 | end, | |
7459 | range->minlen); | |
7460 | ||
7461 | trimmed += group_trimmed; | |
7462 | if (ret) { | |
7463 | btrfs_put_block_group(cache); | |
7464 | break; | |
7465 | } | |
7466 | } | |
7467 | ||
7468 | cache = next_block_group(fs_info->tree_root, cache); | |
7469 | } | |
7470 | ||
7471 | range->len = trimmed; | |
7472 | return ret; | |
7473 | } |