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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 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/writeback.h> | |
21 | #include <linux/blkdev.h> | |
22 | #include <linux/sort.h> | |
23 | #include <linux/rcupdate.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/ratelimit.h> | |
27 | #include <linux/percpu_counter.h> | |
28 | #include "hash.h" | |
29 | #include "tree-log.h" | |
30 | #include "disk-io.h" | |
31 | #include "print-tree.h" | |
32 | #include "volumes.h" | |
33 | #include "raid56.h" | |
34 | #include "locking.h" | |
35 | #include "free-space-cache.h" | |
36 | #include "math.h" | |
37 | #include "sysfs.h" | |
38 | #include "qgroup.h" | |
39 | ||
40 | #undef SCRAMBLE_DELAYED_REFS | |
41 | ||
42 | /* | |
43 | * control flags for do_chunk_alloc's force field | |
44 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk | |
45 | * if we really need one. | |
46 | * | |
47 | * CHUNK_ALLOC_LIMITED means to only try and allocate one | |
48 | * if we have very few chunks already allocated. This is | |
49 | * used as part of the clustering code to help make sure | |
50 | * we have a good pool of storage to cluster in, without | |
51 | * filling the FS with empty chunks | |
52 | * | |
53 | * CHUNK_ALLOC_FORCE means it must try to allocate one | |
54 | * | |
55 | */ | |
56 | enum { | |
57 | CHUNK_ALLOC_NO_FORCE = 0, | |
58 | CHUNK_ALLOC_LIMITED = 1, | |
59 | CHUNK_ALLOC_FORCE = 2, | |
60 | }; | |
61 | ||
62 | /* | |
63 | * Control how reservations are dealt with. | |
64 | * | |
65 | * RESERVE_FREE - freeing a reservation. | |
66 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
67 | * ENOSPC accounting | |
68 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
69 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
70 | */ | |
71 | enum { | |
72 | RESERVE_FREE = 0, | |
73 | RESERVE_ALLOC = 1, | |
74 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
75 | }; | |
76 | ||
77 | static int update_block_group(struct btrfs_trans_handle *trans, | |
78 | struct btrfs_root *root, u64 bytenr, | |
79 | u64 num_bytes, int alloc); | |
80 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, | |
81 | struct btrfs_root *root, | |
82 | u64 bytenr, u64 num_bytes, u64 parent, | |
83 | u64 root_objectid, u64 owner_objectid, | |
84 | u64 owner_offset, int refs_to_drop, | |
85 | struct btrfs_delayed_extent_op *extra_op, | |
86 | int no_quota); | |
87 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
88 | struct extent_buffer *leaf, | |
89 | struct btrfs_extent_item *ei); | |
90 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
91 | struct btrfs_root *root, | |
92 | u64 parent, u64 root_objectid, | |
93 | u64 flags, u64 owner, u64 offset, | |
94 | struct btrfs_key *ins, int ref_mod); | |
95 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
96 | struct btrfs_root *root, | |
97 | u64 parent, u64 root_objectid, | |
98 | u64 flags, struct btrfs_disk_key *key, | |
99 | int level, struct btrfs_key *ins, | |
100 | int no_quota); | |
101 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, | |
102 | struct btrfs_root *extent_root, u64 flags, | |
103 | int force); | |
104 | static int find_next_key(struct btrfs_path *path, int level, | |
105 | struct btrfs_key *key); | |
106 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, | |
107 | int dump_block_groups); | |
108 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
109 | u64 num_bytes, int reserve, | |
110 | int delalloc); | |
111 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
112 | u64 num_bytes); | |
113 | int btrfs_pin_extent(struct btrfs_root *root, | |
114 | u64 bytenr, u64 num_bytes, int reserved); | |
115 | ||
116 | static noinline int | |
117 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
118 | { | |
119 | smp_mb(); | |
120 | return cache->cached == BTRFS_CACHE_FINISHED || | |
121 | cache->cached == BTRFS_CACHE_ERROR; | |
122 | } | |
123 | ||
124 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) | |
125 | { | |
126 | return (cache->flags & bits) == bits; | |
127 | } | |
128 | ||
129 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) | |
130 | { | |
131 | atomic_inc(&cache->count); | |
132 | } | |
133 | ||
134 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
135 | { | |
136 | if (atomic_dec_and_test(&cache->count)) { | |
137 | WARN_ON(cache->pinned > 0); | |
138 | WARN_ON(cache->reserved > 0); | |
139 | kfree(cache->free_space_ctl); | |
140 | kfree(cache); | |
141 | } | |
142 | } | |
143 | ||
144 | /* | |
145 | * this adds the block group to the fs_info rb tree for the block group | |
146 | * cache | |
147 | */ | |
148 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, | |
149 | struct btrfs_block_group_cache *block_group) | |
150 | { | |
151 | struct rb_node **p; | |
152 | struct rb_node *parent = NULL; | |
153 | struct btrfs_block_group_cache *cache; | |
154 | ||
155 | spin_lock(&info->block_group_cache_lock); | |
156 | p = &info->block_group_cache_tree.rb_node; | |
157 | ||
158 | while (*p) { | |
159 | parent = *p; | |
160 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
161 | cache_node); | |
162 | if (block_group->key.objectid < cache->key.objectid) { | |
163 | p = &(*p)->rb_left; | |
164 | } else if (block_group->key.objectid > cache->key.objectid) { | |
165 | p = &(*p)->rb_right; | |
166 | } else { | |
167 | spin_unlock(&info->block_group_cache_lock); | |
168 | return -EEXIST; | |
169 | } | |
170 | } | |
171 | ||
172 | rb_link_node(&block_group->cache_node, parent, p); | |
173 | rb_insert_color(&block_group->cache_node, | |
174 | &info->block_group_cache_tree); | |
175 | ||
176 | if (info->first_logical_byte > block_group->key.objectid) | |
177 | info->first_logical_byte = block_group->key.objectid; | |
178 | ||
179 | spin_unlock(&info->block_group_cache_lock); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | * This will return the block group at or after bytenr if contains is 0, else | |
186 | * it will return the block group that contains the bytenr | |
187 | */ | |
188 | static struct btrfs_block_group_cache * | |
189 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
190 | int contains) | |
191 | { | |
192 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
193 | struct rb_node *n; | |
194 | u64 end, start; | |
195 | ||
196 | spin_lock(&info->block_group_cache_lock); | |
197 | n = info->block_group_cache_tree.rb_node; | |
198 | ||
199 | while (n) { | |
200 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
201 | cache_node); | |
202 | end = cache->key.objectid + cache->key.offset - 1; | |
203 | start = cache->key.objectid; | |
204 | ||
205 | if (bytenr < start) { | |
206 | if (!contains && (!ret || start < ret->key.objectid)) | |
207 | ret = cache; | |
208 | n = n->rb_left; | |
209 | } else if (bytenr > start) { | |
210 | if (contains && bytenr <= end) { | |
211 | ret = cache; | |
212 | break; | |
213 | } | |
214 | n = n->rb_right; | |
215 | } else { | |
216 | ret = cache; | |
217 | break; | |
218 | } | |
219 | } | |
220 | if (ret) { | |
221 | btrfs_get_block_group(ret); | |
222 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) | |
223 | info->first_logical_byte = ret->key.objectid; | |
224 | } | |
225 | spin_unlock(&info->block_group_cache_lock); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static int add_excluded_extent(struct btrfs_root *root, | |
231 | u64 start, u64 num_bytes) | |
232 | { | |
233 | u64 end = start + num_bytes - 1; | |
234 | set_extent_bits(&root->fs_info->freed_extents[0], | |
235 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
236 | set_extent_bits(&root->fs_info->freed_extents[1], | |
237 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static void free_excluded_extents(struct btrfs_root *root, | |
242 | struct btrfs_block_group_cache *cache) | |
243 | { | |
244 | u64 start, end; | |
245 | ||
246 | start = cache->key.objectid; | |
247 | end = start + cache->key.offset - 1; | |
248 | ||
249 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
250 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
251 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
252 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
253 | } | |
254 | ||
255 | static int exclude_super_stripes(struct btrfs_root *root, | |
256 | struct btrfs_block_group_cache *cache) | |
257 | { | |
258 | u64 bytenr; | |
259 | u64 *logical; | |
260 | int stripe_len; | |
261 | int i, nr, ret; | |
262 | ||
263 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { | |
264 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
265 | cache->bytes_super += stripe_len; | |
266 | ret = add_excluded_extent(root, cache->key.objectid, | |
267 | stripe_len); | |
268 | if (ret) | |
269 | return ret; | |
270 | } | |
271 | ||
272 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
273 | bytenr = btrfs_sb_offset(i); | |
274 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
275 | cache->key.objectid, bytenr, | |
276 | 0, &logical, &nr, &stripe_len); | |
277 | if (ret) | |
278 | return ret; | |
279 | ||
280 | while (nr--) { | |
281 | u64 start, len; | |
282 | ||
283 | if (logical[nr] > cache->key.objectid + | |
284 | cache->key.offset) | |
285 | continue; | |
286 | ||
287 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
288 | continue; | |
289 | ||
290 | start = logical[nr]; | |
291 | if (start < cache->key.objectid) { | |
292 | start = cache->key.objectid; | |
293 | len = (logical[nr] + stripe_len) - start; | |
294 | } else { | |
295 | len = min_t(u64, stripe_len, | |
296 | cache->key.objectid + | |
297 | cache->key.offset - start); | |
298 | } | |
299 | ||
300 | cache->bytes_super += len; | |
301 | ret = add_excluded_extent(root, start, len); | |
302 | if (ret) { | |
303 | kfree(logical); | |
304 | return ret; | |
305 | } | |
306 | } | |
307 | ||
308 | kfree(logical); | |
309 | } | |
310 | return 0; | |
311 | } | |
312 | ||
313 | static struct btrfs_caching_control * | |
314 | get_caching_control(struct btrfs_block_group_cache *cache) | |
315 | { | |
316 | struct btrfs_caching_control *ctl; | |
317 | ||
318 | spin_lock(&cache->lock); | |
319 | if (!cache->caching_ctl) { | |
320 | spin_unlock(&cache->lock); | |
321 | return NULL; | |
322 | } | |
323 | ||
324 | ctl = cache->caching_ctl; | |
325 | atomic_inc(&ctl->count); | |
326 | spin_unlock(&cache->lock); | |
327 | return ctl; | |
328 | } | |
329 | ||
330 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
331 | { | |
332 | if (atomic_dec_and_test(&ctl->count)) | |
333 | kfree(ctl); | |
334 | } | |
335 | ||
336 | /* | |
337 | * this is only called by cache_block_group, since we could have freed extents | |
338 | * we need to check the pinned_extents for any extents that can't be used yet | |
339 | * since their free space will be released as soon as the transaction commits. | |
340 | */ | |
341 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, | |
342 | struct btrfs_fs_info *info, u64 start, u64 end) | |
343 | { | |
344 | u64 extent_start, extent_end, size, total_added = 0; | |
345 | int ret; | |
346 | ||
347 | while (start < end) { | |
348 | ret = find_first_extent_bit(info->pinned_extents, start, | |
349 | &extent_start, &extent_end, | |
350 | EXTENT_DIRTY | EXTENT_UPTODATE, | |
351 | NULL); | |
352 | if (ret) | |
353 | break; | |
354 | ||
355 | if (extent_start <= start) { | |
356 | start = extent_end + 1; | |
357 | } else if (extent_start > start && extent_start < end) { | |
358 | size = extent_start - start; | |
359 | total_added += size; | |
360 | ret = btrfs_add_free_space(block_group, start, | |
361 | size); | |
362 | BUG_ON(ret); /* -ENOMEM or logic error */ | |
363 | start = extent_end + 1; | |
364 | } else { | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
369 | if (start < end) { | |
370 | size = end - start; | |
371 | total_added += size; | |
372 | ret = btrfs_add_free_space(block_group, start, size); | |
373 | BUG_ON(ret); /* -ENOMEM or logic error */ | |
374 | } | |
375 | ||
376 | return total_added; | |
377 | } | |
378 | ||
379 | static noinline void caching_thread(struct btrfs_work *work) | |
380 | { | |
381 | struct btrfs_block_group_cache *block_group; | |
382 | struct btrfs_fs_info *fs_info; | |
383 | struct btrfs_caching_control *caching_ctl; | |
384 | struct btrfs_root *extent_root; | |
385 | struct btrfs_path *path; | |
386 | struct extent_buffer *leaf; | |
387 | struct btrfs_key key; | |
388 | u64 total_found = 0; | |
389 | u64 last = 0; | |
390 | u32 nritems; | |
391 | int ret = -ENOMEM; | |
392 | ||
393 | caching_ctl = container_of(work, struct btrfs_caching_control, work); | |
394 | block_group = caching_ctl->block_group; | |
395 | fs_info = block_group->fs_info; | |
396 | extent_root = fs_info->extent_root; | |
397 | ||
398 | path = btrfs_alloc_path(); | |
399 | if (!path) | |
400 | goto out; | |
401 | ||
402 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); | |
403 | ||
404 | /* | |
405 | * We don't want to deadlock with somebody trying to allocate a new | |
406 | * extent for the extent root while also trying to search the extent | |
407 | * root to add free space. So we skip locking and search the commit | |
408 | * root, since its read-only | |
409 | */ | |
410 | path->skip_locking = 1; | |
411 | path->search_commit_root = 1; | |
412 | path->reada = 1; | |
413 | ||
414 | key.objectid = last; | |
415 | key.offset = 0; | |
416 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
417 | again: | |
418 | mutex_lock(&caching_ctl->mutex); | |
419 | /* need to make sure the commit_root doesn't disappear */ | |
420 | down_read(&fs_info->commit_root_sem); | |
421 | ||
422 | next: | |
423 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
424 | if (ret < 0) | |
425 | goto err; | |
426 | ||
427 | leaf = path->nodes[0]; | |
428 | nritems = btrfs_header_nritems(leaf); | |
429 | ||
430 | while (1) { | |
431 | if (btrfs_fs_closing(fs_info) > 1) { | |
432 | last = (u64)-1; | |
433 | break; | |
434 | } | |
435 | ||
436 | if (path->slots[0] < nritems) { | |
437 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
438 | } else { | |
439 | ret = find_next_key(path, 0, &key); | |
440 | if (ret) | |
441 | break; | |
442 | ||
443 | if (need_resched() || | |
444 | rwsem_is_contended(&fs_info->commit_root_sem)) { | |
445 | caching_ctl->progress = last; | |
446 | btrfs_release_path(path); | |
447 | up_read(&fs_info->commit_root_sem); | |
448 | mutex_unlock(&caching_ctl->mutex); | |
449 | cond_resched(); | |
450 | goto again; | |
451 | } | |
452 | ||
453 | ret = btrfs_next_leaf(extent_root, path); | |
454 | if (ret < 0) | |
455 | goto err; | |
456 | if (ret) | |
457 | break; | |
458 | leaf = path->nodes[0]; | |
459 | nritems = btrfs_header_nritems(leaf); | |
460 | continue; | |
461 | } | |
462 | ||
463 | if (key.objectid < last) { | |
464 | key.objectid = last; | |
465 | key.offset = 0; | |
466 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
467 | ||
468 | caching_ctl->progress = last; | |
469 | btrfs_release_path(path); | |
470 | goto next; | |
471 | } | |
472 | ||
473 | if (key.objectid < block_group->key.objectid) { | |
474 | path->slots[0]++; | |
475 | continue; | |
476 | } | |
477 | ||
478 | if (key.objectid >= block_group->key.objectid + | |
479 | block_group->key.offset) | |
480 | break; | |
481 | ||
482 | if (key.type == BTRFS_EXTENT_ITEM_KEY || | |
483 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
484 | total_found += add_new_free_space(block_group, | |
485 | fs_info, last, | |
486 | key.objectid); | |
487 | if (key.type == BTRFS_METADATA_ITEM_KEY) | |
488 | last = key.objectid + | |
489 | fs_info->tree_root->nodesize; | |
490 | else | |
491 | last = key.objectid + key.offset; | |
492 | ||
493 | if (total_found > (1024 * 1024 * 2)) { | |
494 | total_found = 0; | |
495 | wake_up(&caching_ctl->wait); | |
496 | } | |
497 | } | |
498 | path->slots[0]++; | |
499 | } | |
500 | ret = 0; | |
501 | ||
502 | total_found += add_new_free_space(block_group, fs_info, last, | |
503 | block_group->key.objectid + | |
504 | block_group->key.offset); | |
505 | caching_ctl->progress = (u64)-1; | |
506 | ||
507 | spin_lock(&block_group->lock); | |
508 | block_group->caching_ctl = NULL; | |
509 | block_group->cached = BTRFS_CACHE_FINISHED; | |
510 | spin_unlock(&block_group->lock); | |
511 | ||
512 | err: | |
513 | btrfs_free_path(path); | |
514 | up_read(&fs_info->commit_root_sem); | |
515 | ||
516 | free_excluded_extents(extent_root, block_group); | |
517 | ||
518 | mutex_unlock(&caching_ctl->mutex); | |
519 | out: | |
520 | if (ret) { | |
521 | spin_lock(&block_group->lock); | |
522 | block_group->caching_ctl = NULL; | |
523 | block_group->cached = BTRFS_CACHE_ERROR; | |
524 | spin_unlock(&block_group->lock); | |
525 | } | |
526 | wake_up(&caching_ctl->wait); | |
527 | ||
528 | put_caching_control(caching_ctl); | |
529 | btrfs_put_block_group(block_group); | |
530 | } | |
531 | ||
532 | static int cache_block_group(struct btrfs_block_group_cache *cache, | |
533 | int load_cache_only) | |
534 | { | |
535 | DEFINE_WAIT(wait); | |
536 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
537 | struct btrfs_caching_control *caching_ctl; | |
538 | int ret = 0; | |
539 | ||
540 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); | |
541 | if (!caching_ctl) | |
542 | return -ENOMEM; | |
543 | ||
544 | INIT_LIST_HEAD(&caching_ctl->list); | |
545 | mutex_init(&caching_ctl->mutex); | |
546 | init_waitqueue_head(&caching_ctl->wait); | |
547 | caching_ctl->block_group = cache; | |
548 | caching_ctl->progress = cache->key.objectid; | |
549 | atomic_set(&caching_ctl->count, 1); | |
550 | btrfs_init_work(&caching_ctl->work, btrfs_cache_helper, | |
551 | caching_thread, NULL, NULL); | |
552 | ||
553 | spin_lock(&cache->lock); | |
554 | /* | |
555 | * This should be a rare occasion, but this could happen I think in the | |
556 | * case where one thread starts to load the space cache info, and then | |
557 | * some other thread starts a transaction commit which tries to do an | |
558 | * allocation while the other thread is still loading the space cache | |
559 | * info. The previous loop should have kept us from choosing this block | |
560 | * group, but if we've moved to the state where we will wait on caching | |
561 | * block groups we need to first check if we're doing a fast load here, | |
562 | * so we can wait for it to finish, otherwise we could end up allocating | |
563 | * from a block group who's cache gets evicted for one reason or | |
564 | * another. | |
565 | */ | |
566 | while (cache->cached == BTRFS_CACHE_FAST) { | |
567 | struct btrfs_caching_control *ctl; | |
568 | ||
569 | ctl = cache->caching_ctl; | |
570 | atomic_inc(&ctl->count); | |
571 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
572 | spin_unlock(&cache->lock); | |
573 | ||
574 | schedule(); | |
575 | ||
576 | finish_wait(&ctl->wait, &wait); | |
577 | put_caching_control(ctl); | |
578 | spin_lock(&cache->lock); | |
579 | } | |
580 | ||
581 | if (cache->cached != BTRFS_CACHE_NO) { | |
582 | spin_unlock(&cache->lock); | |
583 | kfree(caching_ctl); | |
584 | return 0; | |
585 | } | |
586 | WARN_ON(cache->caching_ctl); | |
587 | cache->caching_ctl = caching_ctl; | |
588 | cache->cached = BTRFS_CACHE_FAST; | |
589 | spin_unlock(&cache->lock); | |
590 | ||
591 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { | |
592 | mutex_lock(&caching_ctl->mutex); | |
593 | ret = load_free_space_cache(fs_info, cache); | |
594 | ||
595 | spin_lock(&cache->lock); | |
596 | if (ret == 1) { | |
597 | cache->caching_ctl = NULL; | |
598 | cache->cached = BTRFS_CACHE_FINISHED; | |
599 | cache->last_byte_to_unpin = (u64)-1; | |
600 | caching_ctl->progress = (u64)-1; | |
601 | } else { | |
602 | if (load_cache_only) { | |
603 | cache->caching_ctl = NULL; | |
604 | cache->cached = BTRFS_CACHE_NO; | |
605 | } else { | |
606 | cache->cached = BTRFS_CACHE_STARTED; | |
607 | cache->has_caching_ctl = 1; | |
608 | } | |
609 | } | |
610 | spin_unlock(&cache->lock); | |
611 | mutex_unlock(&caching_ctl->mutex); | |
612 | ||
613 | wake_up(&caching_ctl->wait); | |
614 | if (ret == 1) { | |
615 | put_caching_control(caching_ctl); | |
616 | free_excluded_extents(fs_info->extent_root, cache); | |
617 | return 0; | |
618 | } | |
619 | } else { | |
620 | /* | |
621 | * We are not going to do the fast caching, set cached to the | |
622 | * appropriate value and wakeup any waiters. | |
623 | */ | |
624 | spin_lock(&cache->lock); | |
625 | if (load_cache_only) { | |
626 | cache->caching_ctl = NULL; | |
627 | cache->cached = BTRFS_CACHE_NO; | |
628 | } else { | |
629 | cache->cached = BTRFS_CACHE_STARTED; | |
630 | cache->has_caching_ctl = 1; | |
631 | } | |
632 | spin_unlock(&cache->lock); | |
633 | wake_up(&caching_ctl->wait); | |
634 | } | |
635 | ||
636 | if (load_cache_only) { | |
637 | put_caching_control(caching_ctl); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | down_write(&fs_info->commit_root_sem); | |
642 | atomic_inc(&caching_ctl->count); | |
643 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); | |
644 | up_write(&fs_info->commit_root_sem); | |
645 | ||
646 | btrfs_get_block_group(cache); | |
647 | ||
648 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
653 | /* | |
654 | * return the block group that starts at or after bytenr | |
655 | */ | |
656 | static struct btrfs_block_group_cache * | |
657 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
658 | { | |
659 | struct btrfs_block_group_cache *cache; | |
660 | ||
661 | cache = block_group_cache_tree_search(info, bytenr, 0); | |
662 | ||
663 | return cache; | |
664 | } | |
665 | ||
666 | /* | |
667 | * return the block group that contains the given bytenr | |
668 | */ | |
669 | struct btrfs_block_group_cache *btrfs_lookup_block_group( | |
670 | struct btrfs_fs_info *info, | |
671 | u64 bytenr) | |
672 | { | |
673 | struct btrfs_block_group_cache *cache; | |
674 | ||
675 | cache = block_group_cache_tree_search(info, bytenr, 1); | |
676 | ||
677 | return cache; | |
678 | } | |
679 | ||
680 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, | |
681 | u64 flags) | |
682 | { | |
683 | struct list_head *head = &info->space_info; | |
684 | struct btrfs_space_info *found; | |
685 | ||
686 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; | |
687 | ||
688 | rcu_read_lock(); | |
689 | list_for_each_entry_rcu(found, head, list) { | |
690 | if (found->flags & flags) { | |
691 | rcu_read_unlock(); | |
692 | return found; | |
693 | } | |
694 | } | |
695 | rcu_read_unlock(); | |
696 | return NULL; | |
697 | } | |
698 | ||
699 | /* | |
700 | * after adding space to the filesystem, we need to clear the full flags | |
701 | * on all the space infos. | |
702 | */ | |
703 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
704 | { | |
705 | struct list_head *head = &info->space_info; | |
706 | struct btrfs_space_info *found; | |
707 | ||
708 | rcu_read_lock(); | |
709 | list_for_each_entry_rcu(found, head, list) | |
710 | found->full = 0; | |
711 | rcu_read_unlock(); | |
712 | } | |
713 | ||
714 | /* simple helper to search for an existing data extent at a given offset */ | |
715 | int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len) | |
716 | { | |
717 | int ret; | |
718 | struct btrfs_key key; | |
719 | struct btrfs_path *path; | |
720 | ||
721 | path = btrfs_alloc_path(); | |
722 | if (!path) | |
723 | return -ENOMEM; | |
724 | ||
725 | key.objectid = start; | |
726 | key.offset = len; | |
727 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
728 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
729 | 0, 0); | |
730 | btrfs_free_path(path); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | /* | |
735 | * helper function to lookup reference count and flags of a tree block. | |
736 | * | |
737 | * the head node for delayed ref is used to store the sum of all the | |
738 | * reference count modifications queued up in the rbtree. the head | |
739 | * node may also store the extent flags to set. This way you can check | |
740 | * to see what the reference count and extent flags would be if all of | |
741 | * the delayed refs are not processed. | |
742 | */ | |
743 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
744 | struct btrfs_root *root, u64 bytenr, | |
745 | u64 offset, int metadata, u64 *refs, u64 *flags) | |
746 | { | |
747 | struct btrfs_delayed_ref_head *head; | |
748 | struct btrfs_delayed_ref_root *delayed_refs; | |
749 | struct btrfs_path *path; | |
750 | struct btrfs_extent_item *ei; | |
751 | struct extent_buffer *leaf; | |
752 | struct btrfs_key key; | |
753 | u32 item_size; | |
754 | u64 num_refs; | |
755 | u64 extent_flags; | |
756 | int ret; | |
757 | ||
758 | /* | |
759 | * If we don't have skinny metadata, don't bother doing anything | |
760 | * different | |
761 | */ | |
762 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) { | |
763 | offset = root->nodesize; | |
764 | metadata = 0; | |
765 | } | |
766 | ||
767 | path = btrfs_alloc_path(); | |
768 | if (!path) | |
769 | return -ENOMEM; | |
770 | ||
771 | if (!trans) { | |
772 | path->skip_locking = 1; | |
773 | path->search_commit_root = 1; | |
774 | } | |
775 | ||
776 | search_again: | |
777 | key.objectid = bytenr; | |
778 | key.offset = offset; | |
779 | if (metadata) | |
780 | key.type = BTRFS_METADATA_ITEM_KEY; | |
781 | else | |
782 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
783 | ||
784 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
785 | &key, path, 0, 0); | |
786 | if (ret < 0) | |
787 | goto out_free; | |
788 | ||
789 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { | |
790 | if (path->slots[0]) { | |
791 | path->slots[0]--; | |
792 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
793 | path->slots[0]); | |
794 | if (key.objectid == bytenr && | |
795 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
796 | key.offset == root->nodesize) | |
797 | ret = 0; | |
798 | } | |
799 | } | |
800 | ||
801 | if (ret == 0) { | |
802 | leaf = path->nodes[0]; | |
803 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
804 | if (item_size >= sizeof(*ei)) { | |
805 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
806 | struct btrfs_extent_item); | |
807 | num_refs = btrfs_extent_refs(leaf, ei); | |
808 | extent_flags = btrfs_extent_flags(leaf, ei); | |
809 | } else { | |
810 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
811 | struct btrfs_extent_item_v0 *ei0; | |
812 | BUG_ON(item_size != sizeof(*ei0)); | |
813 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
814 | struct btrfs_extent_item_v0); | |
815 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
816 | /* FIXME: this isn't correct for data */ | |
817 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
818 | #else | |
819 | BUG(); | |
820 | #endif | |
821 | } | |
822 | BUG_ON(num_refs == 0); | |
823 | } else { | |
824 | num_refs = 0; | |
825 | extent_flags = 0; | |
826 | ret = 0; | |
827 | } | |
828 | ||
829 | if (!trans) | |
830 | goto out; | |
831 | ||
832 | delayed_refs = &trans->transaction->delayed_refs; | |
833 | spin_lock(&delayed_refs->lock); | |
834 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
835 | if (head) { | |
836 | if (!mutex_trylock(&head->mutex)) { | |
837 | atomic_inc(&head->node.refs); | |
838 | spin_unlock(&delayed_refs->lock); | |
839 | ||
840 | btrfs_release_path(path); | |
841 | ||
842 | /* | |
843 | * Mutex was contended, block until it's released and try | |
844 | * again | |
845 | */ | |
846 | mutex_lock(&head->mutex); | |
847 | mutex_unlock(&head->mutex); | |
848 | btrfs_put_delayed_ref(&head->node); | |
849 | goto search_again; | |
850 | } | |
851 | spin_lock(&head->lock); | |
852 | if (head->extent_op && head->extent_op->update_flags) | |
853 | extent_flags |= head->extent_op->flags_to_set; | |
854 | else | |
855 | BUG_ON(num_refs == 0); | |
856 | ||
857 | num_refs += head->node.ref_mod; | |
858 | spin_unlock(&head->lock); | |
859 | mutex_unlock(&head->mutex); | |
860 | } | |
861 | spin_unlock(&delayed_refs->lock); | |
862 | out: | |
863 | WARN_ON(num_refs == 0); | |
864 | if (refs) | |
865 | *refs = num_refs; | |
866 | if (flags) | |
867 | *flags = extent_flags; | |
868 | out_free: | |
869 | btrfs_free_path(path); | |
870 | return ret; | |
871 | } | |
872 | ||
873 | /* | |
874 | * Back reference rules. Back refs have three main goals: | |
875 | * | |
876 | * 1) differentiate between all holders of references to an extent so that | |
877 | * when a reference is dropped we can make sure it was a valid reference | |
878 | * before freeing the extent. | |
879 | * | |
880 | * 2) Provide enough information to quickly find the holders of an extent | |
881 | * if we notice a given block is corrupted or bad. | |
882 | * | |
883 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
884 | * maintenance. This is actually the same as #2, but with a slightly | |
885 | * different use case. | |
886 | * | |
887 | * There are two kinds of back refs. The implicit back refs is optimized | |
888 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
889 | * back refs of this kind provide information about the block's owner tree | |
890 | * and the pointer's key. These information allow us to find the block by | |
891 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
892 | * referenced by their owner trees. The location of tree block is recorded | |
893 | * in the back refs. Actually the full back refs is generic, and can be | |
894 | * used in all cases the implicit back refs is used. The major shortcoming | |
895 | * of the full back refs is its overhead. Every time a tree block gets | |
896 | * COWed, we have to update back refs entry for all pointers in it. | |
897 | * | |
898 | * For a newly allocated tree block, we use implicit back refs for | |
899 | * pointers in it. This means most tree related operations only involve | |
900 | * implicit back refs. For a tree block created in old transaction, the | |
901 | * only way to drop a reference to it is COW it. So we can detect the | |
902 | * event that tree block loses its owner tree's reference and do the | |
903 | * back refs conversion. | |
904 | * | |
905 | * When a tree block is COW'd through a tree, there are four cases: | |
906 | * | |
907 | * The reference count of the block is one and the tree is the block's | |
908 | * owner tree. Nothing to do in this case. | |
909 | * | |
910 | * The reference count of the block is one and the tree is not the | |
911 | * block's owner tree. In this case, full back refs is used for pointers | |
912 | * in the block. Remove these full back refs, add implicit back refs for | |
913 | * every pointers in the new block. | |
914 | * | |
915 | * The reference count of the block is greater than one and the tree is | |
916 | * the block's owner tree. In this case, implicit back refs is used for | |
917 | * pointers in the block. Add full back refs for every pointers in the | |
918 | * block, increase lower level extents' reference counts. The original | |
919 | * implicit back refs are entailed to the new block. | |
920 | * | |
921 | * The reference count of the block is greater than one and the tree is | |
922 | * not the block's owner tree. Add implicit back refs for every pointer in | |
923 | * the new block, increase lower level extents' reference count. | |
924 | * | |
925 | * Back Reference Key composing: | |
926 | * | |
927 | * The key objectid corresponds to the first byte in the extent, | |
928 | * The key type is used to differentiate between types of back refs. | |
929 | * There are different meanings of the key offset for different types | |
930 | * of back refs. | |
931 | * | |
932 | * File extents can be referenced by: | |
933 | * | |
934 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
935 | * - different files inside a single subvolume | |
936 | * - different offsets inside a file (bookend extents in file.c) | |
937 | * | |
938 | * The extent ref structure for the implicit back refs has fields for: | |
939 | * | |
940 | * - Objectid of the subvolume root | |
941 | * - objectid of the file holding the reference | |
942 | * - original offset in the file | |
943 | * - how many bookend extents | |
944 | * | |
945 | * The key offset for the implicit back refs is hash of the first | |
946 | * three fields. | |
947 | * | |
948 | * The extent ref structure for the full back refs has field for: | |
949 | * | |
950 | * - number of pointers in the tree leaf | |
951 | * | |
952 | * The key offset for the implicit back refs is the first byte of | |
953 | * the tree leaf | |
954 | * | |
955 | * When a file extent is allocated, The implicit back refs is used. | |
956 | * the fields are filled in: | |
957 | * | |
958 | * (root_key.objectid, inode objectid, offset in file, 1) | |
959 | * | |
960 | * When a file extent is removed file truncation, we find the | |
961 | * corresponding implicit back refs and check the following fields: | |
962 | * | |
963 | * (btrfs_header_owner(leaf), inode objectid, offset in file) | |
964 | * | |
965 | * Btree extents can be referenced by: | |
966 | * | |
967 | * - Different subvolumes | |
968 | * | |
969 | * Both the implicit back refs and the full back refs for tree blocks | |
970 | * only consist of key. The key offset for the implicit back refs is | |
971 | * objectid of block's owner tree. The key offset for the full back refs | |
972 | * is the first byte of parent block. | |
973 | * | |
974 | * When implicit back refs is used, information about the lowest key and | |
975 | * level of the tree block are required. These information are stored in | |
976 | * tree block info structure. | |
977 | */ | |
978 | ||
979 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
980 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
981 | struct btrfs_root *root, | |
982 | struct btrfs_path *path, | |
983 | u64 owner, u32 extra_size) | |
984 | { | |
985 | struct btrfs_extent_item *item; | |
986 | struct btrfs_extent_item_v0 *ei0; | |
987 | struct btrfs_extent_ref_v0 *ref0; | |
988 | struct btrfs_tree_block_info *bi; | |
989 | struct extent_buffer *leaf; | |
990 | struct btrfs_key key; | |
991 | struct btrfs_key found_key; | |
992 | u32 new_size = sizeof(*item); | |
993 | u64 refs; | |
994 | int ret; | |
995 | ||
996 | leaf = path->nodes[0]; | |
997 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
998 | ||
999 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1000 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1001 | struct btrfs_extent_item_v0); | |
1002 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1003 | ||
1004 | if (owner == (u64)-1) { | |
1005 | while (1) { | |
1006 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1007 | ret = btrfs_next_leaf(root, path); | |
1008 | if (ret < 0) | |
1009 | return ret; | |
1010 | BUG_ON(ret > 0); /* Corruption */ | |
1011 | leaf = path->nodes[0]; | |
1012 | } | |
1013 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1014 | path->slots[0]); | |
1015 | BUG_ON(key.objectid != found_key.objectid); | |
1016 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1017 | path->slots[0]++; | |
1018 | continue; | |
1019 | } | |
1020 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1021 | struct btrfs_extent_ref_v0); | |
1022 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | btrfs_release_path(path); | |
1027 | ||
1028 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1029 | new_size += sizeof(*bi); | |
1030 | ||
1031 | new_size -= sizeof(*ei0); | |
1032 | ret = btrfs_search_slot(trans, root, &key, path, | |
1033 | new_size + extra_size, 1); | |
1034 | if (ret < 0) | |
1035 | return ret; | |
1036 | BUG_ON(ret); /* Corruption */ | |
1037 | ||
1038 | btrfs_extend_item(root, path, new_size); | |
1039 | ||
1040 | leaf = path->nodes[0]; | |
1041 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1042 | btrfs_set_extent_refs(leaf, item, refs); | |
1043 | /* FIXME: get real generation */ | |
1044 | btrfs_set_extent_generation(leaf, item, 0); | |
1045 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1046 | btrfs_set_extent_flags(leaf, item, | |
1047 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1048 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1049 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1050 | /* FIXME: get first key of the block */ | |
1051 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1052 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1053 | } else { | |
1054 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1055 | } | |
1056 | btrfs_mark_buffer_dirty(leaf); | |
1057 | return 0; | |
1058 | } | |
1059 | #endif | |
1060 | ||
1061 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1062 | { | |
1063 | u32 high_crc = ~(u32)0; | |
1064 | u32 low_crc = ~(u32)0; | |
1065 | __le64 lenum; | |
1066 | ||
1067 | lenum = cpu_to_le64(root_objectid); | |
1068 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); | |
1069 | lenum = cpu_to_le64(owner); | |
1070 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); | |
1071 | lenum = cpu_to_le64(offset); | |
1072 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); | |
1073 | ||
1074 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1075 | } | |
1076 | ||
1077 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1078 | struct btrfs_extent_data_ref *ref) | |
1079 | { | |
1080 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1081 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1082 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1083 | } | |
1084 | ||
1085 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1086 | struct btrfs_extent_data_ref *ref, | |
1087 | u64 root_objectid, u64 owner, u64 offset) | |
1088 | { | |
1089 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1090 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1091 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1092 | return 0; | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1097 | struct btrfs_root *root, | |
1098 | struct btrfs_path *path, | |
1099 | u64 bytenr, u64 parent, | |
1100 | u64 root_objectid, | |
1101 | u64 owner, u64 offset) | |
1102 | { | |
1103 | struct btrfs_key key; | |
1104 | struct btrfs_extent_data_ref *ref; | |
1105 | struct extent_buffer *leaf; | |
1106 | u32 nritems; | |
1107 | int ret; | |
1108 | int recow; | |
1109 | int err = -ENOENT; | |
1110 | ||
1111 | key.objectid = bytenr; | |
1112 | if (parent) { | |
1113 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1114 | key.offset = parent; | |
1115 | } else { | |
1116 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1117 | key.offset = hash_extent_data_ref(root_objectid, | |
1118 | owner, offset); | |
1119 | } | |
1120 | again: | |
1121 | recow = 0; | |
1122 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1123 | if (ret < 0) { | |
1124 | err = ret; | |
1125 | goto fail; | |
1126 | } | |
1127 | ||
1128 | if (parent) { | |
1129 | if (!ret) | |
1130 | return 0; | |
1131 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1132 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1133 | btrfs_release_path(path); | |
1134 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1135 | if (ret < 0) { | |
1136 | err = ret; | |
1137 | goto fail; | |
1138 | } | |
1139 | if (!ret) | |
1140 | return 0; | |
1141 | #endif | |
1142 | goto fail; | |
1143 | } | |
1144 | ||
1145 | leaf = path->nodes[0]; | |
1146 | nritems = btrfs_header_nritems(leaf); | |
1147 | while (1) { | |
1148 | if (path->slots[0] >= nritems) { | |
1149 | ret = btrfs_next_leaf(root, path); | |
1150 | if (ret < 0) | |
1151 | err = ret; | |
1152 | if (ret) | |
1153 | goto fail; | |
1154 | ||
1155 | leaf = path->nodes[0]; | |
1156 | nritems = btrfs_header_nritems(leaf); | |
1157 | recow = 1; | |
1158 | } | |
1159 | ||
1160 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1161 | if (key.objectid != bytenr || | |
1162 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1163 | goto fail; | |
1164 | ||
1165 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1166 | struct btrfs_extent_data_ref); | |
1167 | ||
1168 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1169 | owner, offset)) { | |
1170 | if (recow) { | |
1171 | btrfs_release_path(path); | |
1172 | goto again; | |
1173 | } | |
1174 | err = 0; | |
1175 | break; | |
1176 | } | |
1177 | path->slots[0]++; | |
1178 | } | |
1179 | fail: | |
1180 | return err; | |
1181 | } | |
1182 | ||
1183 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, | |
1184 | struct btrfs_root *root, | |
1185 | struct btrfs_path *path, | |
1186 | u64 bytenr, u64 parent, | |
1187 | u64 root_objectid, u64 owner, | |
1188 | u64 offset, int refs_to_add) | |
1189 | { | |
1190 | struct btrfs_key key; | |
1191 | struct extent_buffer *leaf; | |
1192 | u32 size; | |
1193 | u32 num_refs; | |
1194 | int ret; | |
1195 | ||
1196 | key.objectid = bytenr; | |
1197 | if (parent) { | |
1198 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1199 | key.offset = parent; | |
1200 | size = sizeof(struct btrfs_shared_data_ref); | |
1201 | } else { | |
1202 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1203 | key.offset = hash_extent_data_ref(root_objectid, | |
1204 | owner, offset); | |
1205 | size = sizeof(struct btrfs_extent_data_ref); | |
1206 | } | |
1207 | ||
1208 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); | |
1209 | if (ret && ret != -EEXIST) | |
1210 | goto fail; | |
1211 | ||
1212 | leaf = path->nodes[0]; | |
1213 | if (parent) { | |
1214 | struct btrfs_shared_data_ref *ref; | |
1215 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1216 | struct btrfs_shared_data_ref); | |
1217 | if (ret == 0) { | |
1218 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1219 | } else { | |
1220 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1221 | num_refs += refs_to_add; | |
1222 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
1223 | } | |
1224 | } else { | |
1225 | struct btrfs_extent_data_ref *ref; | |
1226 | while (ret == -EEXIST) { | |
1227 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1228 | struct btrfs_extent_data_ref); | |
1229 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1230 | owner, offset)) | |
1231 | break; | |
1232 | btrfs_release_path(path); | |
1233 | key.offset++; | |
1234 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1235 | size); | |
1236 | if (ret && ret != -EEXIST) | |
1237 | goto fail; | |
1238 | ||
1239 | leaf = path->nodes[0]; | |
1240 | } | |
1241 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1242 | struct btrfs_extent_data_ref); | |
1243 | if (ret == 0) { | |
1244 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1245 | root_objectid); | |
1246 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1247 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1248 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1249 | } else { | |
1250 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1251 | num_refs += refs_to_add; | |
1252 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
1253 | } | |
1254 | } | |
1255 | btrfs_mark_buffer_dirty(leaf); | |
1256 | ret = 0; | |
1257 | fail: | |
1258 | btrfs_release_path(path); | |
1259 | return ret; | |
1260 | } | |
1261 | ||
1262 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, | |
1263 | struct btrfs_root *root, | |
1264 | struct btrfs_path *path, | |
1265 | int refs_to_drop, int *last_ref) | |
1266 | { | |
1267 | struct btrfs_key key; | |
1268 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1269 | struct btrfs_shared_data_ref *ref2 = NULL; | |
1270 | struct extent_buffer *leaf; | |
1271 | u32 num_refs = 0; | |
1272 | int ret = 0; | |
1273 | ||
1274 | leaf = path->nodes[0]; | |
1275 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1276 | ||
1277 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1278 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1279 | struct btrfs_extent_data_ref); | |
1280 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1281 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1282 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1283 | struct btrfs_shared_data_ref); | |
1284 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1285 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1286 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1287 | struct btrfs_extent_ref_v0 *ref0; | |
1288 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1289 | struct btrfs_extent_ref_v0); | |
1290 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1291 | #endif | |
1292 | } else { | |
1293 | BUG(); | |
1294 | } | |
1295 | ||
1296 | BUG_ON(num_refs < refs_to_drop); | |
1297 | num_refs -= refs_to_drop; | |
1298 | ||
1299 | if (num_refs == 0) { | |
1300 | ret = btrfs_del_item(trans, root, path); | |
1301 | *last_ref = 1; | |
1302 | } else { | |
1303 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) | |
1304 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1305 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1306 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1307 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1308 | else { | |
1309 | struct btrfs_extent_ref_v0 *ref0; | |
1310 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1311 | struct btrfs_extent_ref_v0); | |
1312 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1313 | } | |
1314 | #endif | |
1315 | btrfs_mark_buffer_dirty(leaf); | |
1316 | } | |
1317 | return ret; | |
1318 | } | |
1319 | ||
1320 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, | |
1321 | struct btrfs_path *path, | |
1322 | struct btrfs_extent_inline_ref *iref) | |
1323 | { | |
1324 | struct btrfs_key key; | |
1325 | struct extent_buffer *leaf; | |
1326 | struct btrfs_extent_data_ref *ref1; | |
1327 | struct btrfs_shared_data_ref *ref2; | |
1328 | u32 num_refs = 0; | |
1329 | ||
1330 | leaf = path->nodes[0]; | |
1331 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1332 | if (iref) { | |
1333 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1334 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1335 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1336 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1337 | } else { | |
1338 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1339 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1340 | } | |
1341 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1342 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1343 | struct btrfs_extent_data_ref); | |
1344 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1345 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1346 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1347 | struct btrfs_shared_data_ref); | |
1348 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1349 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1350 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1351 | struct btrfs_extent_ref_v0 *ref0; | |
1352 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1353 | struct btrfs_extent_ref_v0); | |
1354 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1355 | #endif | |
1356 | } else { | |
1357 | WARN_ON(1); | |
1358 | } | |
1359 | return num_refs; | |
1360 | } | |
1361 | ||
1362 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, | |
1363 | struct btrfs_root *root, | |
1364 | struct btrfs_path *path, | |
1365 | u64 bytenr, u64 parent, | |
1366 | u64 root_objectid) | |
1367 | { | |
1368 | struct btrfs_key key; | |
1369 | int ret; | |
1370 | ||
1371 | key.objectid = bytenr; | |
1372 | if (parent) { | |
1373 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1374 | key.offset = parent; | |
1375 | } else { | |
1376 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1377 | key.offset = root_objectid; | |
1378 | } | |
1379 | ||
1380 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1381 | if (ret > 0) | |
1382 | ret = -ENOENT; | |
1383 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1384 | if (ret == -ENOENT && parent) { | |
1385 | btrfs_release_path(path); | |
1386 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
1387 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1388 | if (ret > 0) | |
1389 | ret = -ENOENT; | |
1390 | } | |
1391 | #endif | |
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, | |
1396 | struct btrfs_root *root, | |
1397 | struct btrfs_path *path, | |
1398 | u64 bytenr, u64 parent, | |
1399 | u64 root_objectid) | |
1400 | { | |
1401 | struct btrfs_key key; | |
1402 | int ret; | |
1403 | ||
1404 | key.objectid = bytenr; | |
1405 | if (parent) { | |
1406 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1407 | key.offset = parent; | |
1408 | } else { | |
1409 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1410 | key.offset = root_objectid; | |
1411 | } | |
1412 | ||
1413 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1414 | btrfs_release_path(path); | |
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | static inline int extent_ref_type(u64 parent, u64 owner) | |
1419 | { | |
1420 | int type; | |
1421 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1422 | if (parent > 0) | |
1423 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1424 | else | |
1425 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1426 | } else { | |
1427 | if (parent > 0) | |
1428 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1429 | else | |
1430 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1431 | } | |
1432 | return type; | |
1433 | } | |
1434 | ||
1435 | static int find_next_key(struct btrfs_path *path, int level, | |
1436 | struct btrfs_key *key) | |
1437 | ||
1438 | { | |
1439 | for (; level < BTRFS_MAX_LEVEL; level++) { | |
1440 | if (!path->nodes[level]) | |
1441 | break; | |
1442 | if (path->slots[level] + 1 >= | |
1443 | btrfs_header_nritems(path->nodes[level])) | |
1444 | continue; | |
1445 | if (level == 0) | |
1446 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1447 | path->slots[level] + 1); | |
1448 | else | |
1449 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1450 | path->slots[level] + 1); | |
1451 | return 0; | |
1452 | } | |
1453 | return 1; | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1458 | * to the address of inline back ref, and 0 is returned. | |
1459 | * | |
1460 | * if back ref isn't found, *ref_ret is set to the address where it | |
1461 | * should be inserted, and -ENOENT is returned. | |
1462 | * | |
1463 | * if insert is true and there are too many inline back refs, the path | |
1464 | * points to the extent item, and -EAGAIN is returned. | |
1465 | * | |
1466 | * NOTE: inline back refs are ordered in the same way that back ref | |
1467 | * items in the tree are ordered. | |
1468 | */ | |
1469 | static noinline_for_stack | |
1470 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1471 | struct btrfs_root *root, | |
1472 | struct btrfs_path *path, | |
1473 | struct btrfs_extent_inline_ref **ref_ret, | |
1474 | u64 bytenr, u64 num_bytes, | |
1475 | u64 parent, u64 root_objectid, | |
1476 | u64 owner, u64 offset, int insert) | |
1477 | { | |
1478 | struct btrfs_key key; | |
1479 | struct extent_buffer *leaf; | |
1480 | struct btrfs_extent_item *ei; | |
1481 | struct btrfs_extent_inline_ref *iref; | |
1482 | u64 flags; | |
1483 | u64 item_size; | |
1484 | unsigned long ptr; | |
1485 | unsigned long end; | |
1486 | int extra_size; | |
1487 | int type; | |
1488 | int want; | |
1489 | int ret; | |
1490 | int err = 0; | |
1491 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
1492 | SKINNY_METADATA); | |
1493 | ||
1494 | key.objectid = bytenr; | |
1495 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1496 | key.offset = num_bytes; | |
1497 | ||
1498 | want = extent_ref_type(parent, owner); | |
1499 | if (insert) { | |
1500 | extra_size = btrfs_extent_inline_ref_size(want); | |
1501 | path->keep_locks = 1; | |
1502 | } else | |
1503 | extra_size = -1; | |
1504 | ||
1505 | /* | |
1506 | * Owner is our parent level, so we can just add one to get the level | |
1507 | * for the block we are interested in. | |
1508 | */ | |
1509 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1510 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1511 | key.offset = owner; | |
1512 | } | |
1513 | ||
1514 | again: | |
1515 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
1516 | if (ret < 0) { | |
1517 | err = ret; | |
1518 | goto out; | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * We may be a newly converted file system which still has the old fat | |
1523 | * extent entries for metadata, so try and see if we have one of those. | |
1524 | */ | |
1525 | if (ret > 0 && skinny_metadata) { | |
1526 | skinny_metadata = false; | |
1527 | if (path->slots[0]) { | |
1528 | path->slots[0]--; | |
1529 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1530 | path->slots[0]); | |
1531 | if (key.objectid == bytenr && | |
1532 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1533 | key.offset == num_bytes) | |
1534 | ret = 0; | |
1535 | } | |
1536 | if (ret) { | |
1537 | key.objectid = bytenr; | |
1538 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1539 | key.offset = num_bytes; | |
1540 | btrfs_release_path(path); | |
1541 | goto again; | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | if (ret && !insert) { | |
1546 | err = -ENOENT; | |
1547 | goto out; | |
1548 | } else if (WARN_ON(ret)) { | |
1549 | err = -EIO; | |
1550 | goto out; | |
1551 | } | |
1552 | ||
1553 | leaf = path->nodes[0]; | |
1554 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1555 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1556 | if (item_size < sizeof(*ei)) { | |
1557 | if (!insert) { | |
1558 | err = -ENOENT; | |
1559 | goto out; | |
1560 | } | |
1561 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1562 | extra_size); | |
1563 | if (ret < 0) { | |
1564 | err = ret; | |
1565 | goto out; | |
1566 | } | |
1567 | leaf = path->nodes[0]; | |
1568 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1569 | } | |
1570 | #endif | |
1571 | BUG_ON(item_size < sizeof(*ei)); | |
1572 | ||
1573 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1574 | flags = btrfs_extent_flags(leaf, ei); | |
1575 | ||
1576 | ptr = (unsigned long)(ei + 1); | |
1577 | end = (unsigned long)ei + item_size; | |
1578 | ||
1579 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { | |
1580 | ptr += sizeof(struct btrfs_tree_block_info); | |
1581 | BUG_ON(ptr > end); | |
1582 | } | |
1583 | ||
1584 | err = -ENOENT; | |
1585 | while (1) { | |
1586 | if (ptr >= end) { | |
1587 | WARN_ON(ptr > end); | |
1588 | break; | |
1589 | } | |
1590 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1591 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1592 | if (want < type) | |
1593 | break; | |
1594 | if (want > type) { | |
1595 | ptr += btrfs_extent_inline_ref_size(type); | |
1596 | continue; | |
1597 | } | |
1598 | ||
1599 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1600 | struct btrfs_extent_data_ref *dref; | |
1601 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1602 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1603 | owner, offset)) { | |
1604 | err = 0; | |
1605 | break; | |
1606 | } | |
1607 | if (hash_extent_data_ref_item(leaf, dref) < | |
1608 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1609 | break; | |
1610 | } else { | |
1611 | u64 ref_offset; | |
1612 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1613 | if (parent > 0) { | |
1614 | if (parent == ref_offset) { | |
1615 | err = 0; | |
1616 | break; | |
1617 | } | |
1618 | if (ref_offset < parent) | |
1619 | break; | |
1620 | } else { | |
1621 | if (root_objectid == ref_offset) { | |
1622 | err = 0; | |
1623 | break; | |
1624 | } | |
1625 | if (ref_offset < root_objectid) | |
1626 | break; | |
1627 | } | |
1628 | } | |
1629 | ptr += btrfs_extent_inline_ref_size(type); | |
1630 | } | |
1631 | if (err == -ENOENT && insert) { | |
1632 | if (item_size + extra_size >= | |
1633 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1634 | err = -EAGAIN; | |
1635 | goto out; | |
1636 | } | |
1637 | /* | |
1638 | * To add new inline back ref, we have to make sure | |
1639 | * there is no corresponding back ref item. | |
1640 | * For simplicity, we just do not add new inline back | |
1641 | * ref if there is any kind of item for this block | |
1642 | */ | |
1643 | if (find_next_key(path, 0, &key) == 0 && | |
1644 | key.objectid == bytenr && | |
1645 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { | |
1646 | err = -EAGAIN; | |
1647 | goto out; | |
1648 | } | |
1649 | } | |
1650 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1651 | out: | |
1652 | if (insert) { | |
1653 | path->keep_locks = 0; | |
1654 | btrfs_unlock_up_safe(path, 1); | |
1655 | } | |
1656 | return err; | |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * helper to add new inline back ref | |
1661 | */ | |
1662 | static noinline_for_stack | |
1663 | void setup_inline_extent_backref(struct btrfs_root *root, | |
1664 | struct btrfs_path *path, | |
1665 | struct btrfs_extent_inline_ref *iref, | |
1666 | u64 parent, u64 root_objectid, | |
1667 | u64 owner, u64 offset, int refs_to_add, | |
1668 | struct btrfs_delayed_extent_op *extent_op) | |
1669 | { | |
1670 | struct extent_buffer *leaf; | |
1671 | struct btrfs_extent_item *ei; | |
1672 | unsigned long ptr; | |
1673 | unsigned long end; | |
1674 | unsigned long item_offset; | |
1675 | u64 refs; | |
1676 | int size; | |
1677 | int type; | |
1678 | ||
1679 | leaf = path->nodes[0]; | |
1680 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1681 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1682 | ||
1683 | type = extent_ref_type(parent, owner); | |
1684 | size = btrfs_extent_inline_ref_size(type); | |
1685 | ||
1686 | btrfs_extend_item(root, path, size); | |
1687 | ||
1688 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1689 | refs = btrfs_extent_refs(leaf, ei); | |
1690 | refs += refs_to_add; | |
1691 | btrfs_set_extent_refs(leaf, ei, refs); | |
1692 | if (extent_op) | |
1693 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1694 | ||
1695 | ptr = (unsigned long)ei + item_offset; | |
1696 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1697 | if (ptr < end - size) | |
1698 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1699 | end - size - ptr); | |
1700 | ||
1701 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1702 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1703 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1704 | struct btrfs_extent_data_ref *dref; | |
1705 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1706 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1707 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1708 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1709 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1710 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1711 | struct btrfs_shared_data_ref *sref; | |
1712 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1713 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1714 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1715 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1716 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1717 | } else { | |
1718 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1719 | } | |
1720 | btrfs_mark_buffer_dirty(leaf); | |
1721 | } | |
1722 | ||
1723 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1724 | struct btrfs_root *root, | |
1725 | struct btrfs_path *path, | |
1726 | struct btrfs_extent_inline_ref **ref_ret, | |
1727 | u64 bytenr, u64 num_bytes, u64 parent, | |
1728 | u64 root_objectid, u64 owner, u64 offset) | |
1729 | { | |
1730 | int ret; | |
1731 | ||
1732 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1733 | bytenr, num_bytes, parent, | |
1734 | root_objectid, owner, offset, 0); | |
1735 | if (ret != -ENOENT) | |
1736 | return ret; | |
1737 | ||
1738 | btrfs_release_path(path); | |
1739 | *ref_ret = NULL; | |
1740 | ||
1741 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1742 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1743 | root_objectid); | |
1744 | } else { | |
1745 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1746 | root_objectid, owner, offset); | |
1747 | } | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * helper to update/remove inline back ref | |
1753 | */ | |
1754 | static noinline_for_stack | |
1755 | void update_inline_extent_backref(struct btrfs_root *root, | |
1756 | struct btrfs_path *path, | |
1757 | struct btrfs_extent_inline_ref *iref, | |
1758 | int refs_to_mod, | |
1759 | struct btrfs_delayed_extent_op *extent_op, | |
1760 | int *last_ref) | |
1761 | { | |
1762 | struct extent_buffer *leaf; | |
1763 | struct btrfs_extent_item *ei; | |
1764 | struct btrfs_extent_data_ref *dref = NULL; | |
1765 | struct btrfs_shared_data_ref *sref = NULL; | |
1766 | unsigned long ptr; | |
1767 | unsigned long end; | |
1768 | u32 item_size; | |
1769 | int size; | |
1770 | int type; | |
1771 | u64 refs; | |
1772 | ||
1773 | leaf = path->nodes[0]; | |
1774 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1775 | refs = btrfs_extent_refs(leaf, ei); | |
1776 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1777 | refs += refs_to_mod; | |
1778 | btrfs_set_extent_refs(leaf, ei, refs); | |
1779 | if (extent_op) | |
1780 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1781 | ||
1782 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1783 | ||
1784 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1785 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1786 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1787 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1788 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1789 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1790 | } else { | |
1791 | refs = 1; | |
1792 | BUG_ON(refs_to_mod != -1); | |
1793 | } | |
1794 | ||
1795 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); | |
1796 | refs += refs_to_mod; | |
1797 | ||
1798 | if (refs > 0) { | |
1799 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1800 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1801 | else | |
1802 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1803 | } else { | |
1804 | *last_ref = 1; | |
1805 | size = btrfs_extent_inline_ref_size(type); | |
1806 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1807 | ptr = (unsigned long)iref; | |
1808 | end = (unsigned long)ei + item_size; | |
1809 | if (ptr + size < end) | |
1810 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1811 | end - ptr - size); | |
1812 | item_size -= size; | |
1813 | btrfs_truncate_item(root, path, item_size, 1); | |
1814 | } | |
1815 | btrfs_mark_buffer_dirty(leaf); | |
1816 | } | |
1817 | ||
1818 | static noinline_for_stack | |
1819 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1820 | struct btrfs_root *root, | |
1821 | struct btrfs_path *path, | |
1822 | u64 bytenr, u64 num_bytes, u64 parent, | |
1823 | u64 root_objectid, u64 owner, | |
1824 | u64 offset, int refs_to_add, | |
1825 | struct btrfs_delayed_extent_op *extent_op) | |
1826 | { | |
1827 | struct btrfs_extent_inline_ref *iref; | |
1828 | int ret; | |
1829 | ||
1830 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1831 | bytenr, num_bytes, parent, | |
1832 | root_objectid, owner, offset, 1); | |
1833 | if (ret == 0) { | |
1834 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
1835 | update_inline_extent_backref(root, path, iref, | |
1836 | refs_to_add, extent_op, NULL); | |
1837 | } else if (ret == -ENOENT) { | |
1838 | setup_inline_extent_backref(root, path, iref, parent, | |
1839 | root_objectid, owner, offset, | |
1840 | refs_to_add, extent_op); | |
1841 | ret = 0; | |
1842 | } | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | static int insert_extent_backref(struct btrfs_trans_handle *trans, | |
1847 | struct btrfs_root *root, | |
1848 | struct btrfs_path *path, | |
1849 | u64 bytenr, u64 parent, u64 root_objectid, | |
1850 | u64 owner, u64 offset, int refs_to_add) | |
1851 | { | |
1852 | int ret; | |
1853 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1854 | BUG_ON(refs_to_add != 1); | |
1855 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1856 | parent, root_objectid); | |
1857 | } else { | |
1858 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1859 | parent, root_objectid, | |
1860 | owner, offset, refs_to_add); | |
1861 | } | |
1862 | return ret; | |
1863 | } | |
1864 | ||
1865 | static int remove_extent_backref(struct btrfs_trans_handle *trans, | |
1866 | struct btrfs_root *root, | |
1867 | struct btrfs_path *path, | |
1868 | struct btrfs_extent_inline_ref *iref, | |
1869 | int refs_to_drop, int is_data, int *last_ref) | |
1870 | { | |
1871 | int ret = 0; | |
1872 | ||
1873 | BUG_ON(!is_data && refs_to_drop != 1); | |
1874 | if (iref) { | |
1875 | update_inline_extent_backref(root, path, iref, | |
1876 | -refs_to_drop, NULL, last_ref); | |
1877 | } else if (is_data) { | |
1878 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop, | |
1879 | last_ref); | |
1880 | } else { | |
1881 | *last_ref = 1; | |
1882 | ret = btrfs_del_item(trans, root, path); | |
1883 | } | |
1884 | return ret; | |
1885 | } | |
1886 | ||
1887 | static int btrfs_issue_discard(struct block_device *bdev, | |
1888 | u64 start, u64 len) | |
1889 | { | |
1890 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); | |
1891 | } | |
1892 | ||
1893 | int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
1894 | u64 num_bytes, u64 *actual_bytes) | |
1895 | { | |
1896 | int ret; | |
1897 | u64 discarded_bytes = 0; | |
1898 | struct btrfs_bio *bbio = NULL; | |
1899 | ||
1900 | ||
1901 | /* Tell the block device(s) that the sectors can be discarded */ | |
1902 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, | |
1903 | bytenr, &num_bytes, &bbio, 0); | |
1904 | /* Error condition is -ENOMEM */ | |
1905 | if (!ret) { | |
1906 | struct btrfs_bio_stripe *stripe = bbio->stripes; | |
1907 | int i; | |
1908 | ||
1909 | ||
1910 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { | |
1911 | if (!stripe->dev->can_discard) | |
1912 | continue; | |
1913 | ||
1914 | ret = btrfs_issue_discard(stripe->dev->bdev, | |
1915 | stripe->physical, | |
1916 | stripe->length); | |
1917 | if (!ret) | |
1918 | discarded_bytes += stripe->length; | |
1919 | else if (ret != -EOPNOTSUPP) | |
1920 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ | |
1921 | ||
1922 | /* | |
1923 | * Just in case we get back EOPNOTSUPP for some reason, | |
1924 | * just ignore the return value so we don't screw up | |
1925 | * people calling discard_extent. | |
1926 | */ | |
1927 | ret = 0; | |
1928 | } | |
1929 | btrfs_put_bbio(bbio); | |
1930 | } | |
1931 | ||
1932 | if (actual_bytes) | |
1933 | *actual_bytes = discarded_bytes; | |
1934 | ||
1935 | ||
1936 | if (ret == -EOPNOTSUPP) | |
1937 | ret = 0; | |
1938 | return ret; | |
1939 | } | |
1940 | ||
1941 | /* Can return -ENOMEM */ | |
1942 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1943 | struct btrfs_root *root, | |
1944 | u64 bytenr, u64 num_bytes, u64 parent, | |
1945 | u64 root_objectid, u64 owner, u64 offset, | |
1946 | int no_quota) | |
1947 | { | |
1948 | int ret; | |
1949 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1950 | ||
1951 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && | |
1952 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1953 | ||
1954 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1955 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, | |
1956 | num_bytes, | |
1957 | parent, root_objectid, (int)owner, | |
1958 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); | |
1959 | } else { | |
1960 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, | |
1961 | num_bytes, | |
1962 | parent, root_objectid, owner, offset, | |
1963 | BTRFS_ADD_DELAYED_REF, NULL, no_quota); | |
1964 | } | |
1965 | return ret; | |
1966 | } | |
1967 | ||
1968 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1969 | struct btrfs_root *root, | |
1970 | u64 bytenr, u64 num_bytes, | |
1971 | u64 parent, u64 root_objectid, | |
1972 | u64 owner, u64 offset, int refs_to_add, | |
1973 | int no_quota, | |
1974 | struct btrfs_delayed_extent_op *extent_op) | |
1975 | { | |
1976 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1977 | struct btrfs_path *path; | |
1978 | struct extent_buffer *leaf; | |
1979 | struct btrfs_extent_item *item; | |
1980 | struct btrfs_key key; | |
1981 | u64 refs; | |
1982 | int ret; | |
1983 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_ADD_EXCL; | |
1984 | ||
1985 | path = btrfs_alloc_path(); | |
1986 | if (!path) | |
1987 | return -ENOMEM; | |
1988 | ||
1989 | if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled) | |
1990 | no_quota = 1; | |
1991 | ||
1992 | path->reada = 1; | |
1993 | path->leave_spinning = 1; | |
1994 | /* this will setup the path even if it fails to insert the back ref */ | |
1995 | ret = insert_inline_extent_backref(trans, fs_info->extent_root, path, | |
1996 | bytenr, num_bytes, parent, | |
1997 | root_objectid, owner, offset, | |
1998 | refs_to_add, extent_op); | |
1999 | if ((ret < 0 && ret != -EAGAIN) || (!ret && no_quota)) | |
2000 | goto out; | |
2001 | /* | |
2002 | * Ok we were able to insert an inline extent and it appears to be a new | |
2003 | * reference, deal with the qgroup accounting. | |
2004 | */ | |
2005 | if (!ret && !no_quota) { | |
2006 | ASSERT(root->fs_info->quota_enabled); | |
2007 | leaf = path->nodes[0]; | |
2008 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2009 | item = btrfs_item_ptr(leaf, path->slots[0], | |
2010 | struct btrfs_extent_item); | |
2011 | if (btrfs_extent_refs(leaf, item) > (u64)refs_to_add) | |
2012 | type = BTRFS_QGROUP_OPER_ADD_SHARED; | |
2013 | btrfs_release_path(path); | |
2014 | ||
2015 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, | |
2016 | bytenr, num_bytes, type, 0); | |
2017 | goto out; | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * Ok we had -EAGAIN which means we didn't have space to insert and | |
2022 | * inline extent ref, so just update the reference count and add a | |
2023 | * normal backref. | |
2024 | */ | |
2025 | leaf = path->nodes[0]; | |
2026 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2027 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2028 | refs = btrfs_extent_refs(leaf, item); | |
2029 | if (refs) | |
2030 | type = BTRFS_QGROUP_OPER_ADD_SHARED; | |
2031 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2032 | if (extent_op) | |
2033 | __run_delayed_extent_op(extent_op, leaf, item); | |
2034 | ||
2035 | btrfs_mark_buffer_dirty(leaf); | |
2036 | btrfs_release_path(path); | |
2037 | ||
2038 | if (!no_quota) { | |
2039 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, | |
2040 | bytenr, num_bytes, type, 0); | |
2041 | if (ret) | |
2042 | goto out; | |
2043 | } | |
2044 | ||
2045 | path->reada = 1; | |
2046 | path->leave_spinning = 1; | |
2047 | /* now insert the actual backref */ | |
2048 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
2049 | path, bytenr, parent, root_objectid, | |
2050 | owner, offset, refs_to_add); | |
2051 | if (ret) | |
2052 | btrfs_abort_transaction(trans, root, ret); | |
2053 | out: | |
2054 | btrfs_free_path(path); | |
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, | |
2059 | struct btrfs_root *root, | |
2060 | struct btrfs_delayed_ref_node *node, | |
2061 | struct btrfs_delayed_extent_op *extent_op, | |
2062 | int insert_reserved) | |
2063 | { | |
2064 | int ret = 0; | |
2065 | struct btrfs_delayed_data_ref *ref; | |
2066 | struct btrfs_key ins; | |
2067 | u64 parent = 0; | |
2068 | u64 ref_root = 0; | |
2069 | u64 flags = 0; | |
2070 | ||
2071 | ins.objectid = node->bytenr; | |
2072 | ins.offset = node->num_bytes; | |
2073 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2074 | ||
2075 | ref = btrfs_delayed_node_to_data_ref(node); | |
2076 | trace_run_delayed_data_ref(node, ref, node->action); | |
2077 | ||
2078 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2079 | parent = ref->parent; | |
2080 | ref_root = ref->root; | |
2081 | ||
2082 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2083 | if (extent_op) | |
2084 | flags |= extent_op->flags_to_set; | |
2085 | ret = alloc_reserved_file_extent(trans, root, | |
2086 | parent, ref_root, flags, | |
2087 | ref->objectid, ref->offset, | |
2088 | &ins, node->ref_mod); | |
2089 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { | |
2090 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2091 | node->num_bytes, parent, | |
2092 | ref_root, ref->objectid, | |
2093 | ref->offset, node->ref_mod, | |
2094 | node->no_quota, extent_op); | |
2095 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2096 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2097 | node->num_bytes, parent, | |
2098 | ref_root, ref->objectid, | |
2099 | ref->offset, node->ref_mod, | |
2100 | extent_op, node->no_quota); | |
2101 | } else { | |
2102 | BUG(); | |
2103 | } | |
2104 | return ret; | |
2105 | } | |
2106 | ||
2107 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2108 | struct extent_buffer *leaf, | |
2109 | struct btrfs_extent_item *ei) | |
2110 | { | |
2111 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2112 | if (extent_op->update_flags) { | |
2113 | flags |= extent_op->flags_to_set; | |
2114 | btrfs_set_extent_flags(leaf, ei, flags); | |
2115 | } | |
2116 | ||
2117 | if (extent_op->update_key) { | |
2118 | struct btrfs_tree_block_info *bi; | |
2119 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2120 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2121 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2126 | struct btrfs_root *root, | |
2127 | struct btrfs_delayed_ref_node *node, | |
2128 | struct btrfs_delayed_extent_op *extent_op) | |
2129 | { | |
2130 | struct btrfs_key key; | |
2131 | struct btrfs_path *path; | |
2132 | struct btrfs_extent_item *ei; | |
2133 | struct extent_buffer *leaf; | |
2134 | u32 item_size; | |
2135 | int ret; | |
2136 | int err = 0; | |
2137 | int metadata = !extent_op->is_data; | |
2138 | ||
2139 | if (trans->aborted) | |
2140 | return 0; | |
2141 | ||
2142 | if (metadata && !btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2143 | metadata = 0; | |
2144 | ||
2145 | path = btrfs_alloc_path(); | |
2146 | if (!path) | |
2147 | return -ENOMEM; | |
2148 | ||
2149 | key.objectid = node->bytenr; | |
2150 | ||
2151 | if (metadata) { | |
2152 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2153 | key.offset = extent_op->level; | |
2154 | } else { | |
2155 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2156 | key.offset = node->num_bytes; | |
2157 | } | |
2158 | ||
2159 | again: | |
2160 | path->reada = 1; | |
2161 | path->leave_spinning = 1; | |
2162 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2163 | path, 0, 1); | |
2164 | if (ret < 0) { | |
2165 | err = ret; | |
2166 | goto out; | |
2167 | } | |
2168 | if (ret > 0) { | |
2169 | if (metadata) { | |
2170 | if (path->slots[0] > 0) { | |
2171 | path->slots[0]--; | |
2172 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2173 | path->slots[0]); | |
2174 | if (key.objectid == node->bytenr && | |
2175 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
2176 | key.offset == node->num_bytes) | |
2177 | ret = 0; | |
2178 | } | |
2179 | if (ret > 0) { | |
2180 | btrfs_release_path(path); | |
2181 | metadata = 0; | |
2182 | ||
2183 | key.objectid = node->bytenr; | |
2184 | key.offset = node->num_bytes; | |
2185 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2186 | goto again; | |
2187 | } | |
2188 | } else { | |
2189 | err = -EIO; | |
2190 | goto out; | |
2191 | } | |
2192 | } | |
2193 | ||
2194 | leaf = path->nodes[0]; | |
2195 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2196 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2197 | if (item_size < sizeof(*ei)) { | |
2198 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2199 | path, (u64)-1, 0); | |
2200 | if (ret < 0) { | |
2201 | err = ret; | |
2202 | goto out; | |
2203 | } | |
2204 | leaf = path->nodes[0]; | |
2205 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2206 | } | |
2207 | #endif | |
2208 | BUG_ON(item_size < sizeof(*ei)); | |
2209 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2210 | __run_delayed_extent_op(extent_op, leaf, ei); | |
2211 | ||
2212 | btrfs_mark_buffer_dirty(leaf); | |
2213 | out: | |
2214 | btrfs_free_path(path); | |
2215 | return err; | |
2216 | } | |
2217 | ||
2218 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, | |
2219 | struct btrfs_root *root, | |
2220 | struct btrfs_delayed_ref_node *node, | |
2221 | struct btrfs_delayed_extent_op *extent_op, | |
2222 | int insert_reserved) | |
2223 | { | |
2224 | int ret = 0; | |
2225 | struct btrfs_delayed_tree_ref *ref; | |
2226 | struct btrfs_key ins; | |
2227 | u64 parent = 0; | |
2228 | u64 ref_root = 0; | |
2229 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
2230 | SKINNY_METADATA); | |
2231 | ||
2232 | ref = btrfs_delayed_node_to_tree_ref(node); | |
2233 | trace_run_delayed_tree_ref(node, ref, node->action); | |
2234 | ||
2235 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2236 | parent = ref->parent; | |
2237 | ref_root = ref->root; | |
2238 | ||
2239 | ins.objectid = node->bytenr; | |
2240 | if (skinny_metadata) { | |
2241 | ins.offset = ref->level; | |
2242 | ins.type = BTRFS_METADATA_ITEM_KEY; | |
2243 | } else { | |
2244 | ins.offset = node->num_bytes; | |
2245 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2246 | } | |
2247 | ||
2248 | BUG_ON(node->ref_mod != 1); | |
2249 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2250 | BUG_ON(!extent_op || !extent_op->update_flags); | |
2251 | ret = alloc_reserved_tree_block(trans, root, | |
2252 | parent, ref_root, | |
2253 | extent_op->flags_to_set, | |
2254 | &extent_op->key, | |
2255 | ref->level, &ins, | |
2256 | node->no_quota); | |
2257 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { | |
2258 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2259 | node->num_bytes, parent, ref_root, | |
2260 | ref->level, 0, 1, node->no_quota, | |
2261 | extent_op); | |
2262 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2263 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2264 | node->num_bytes, parent, ref_root, | |
2265 | ref->level, 0, 1, extent_op, | |
2266 | node->no_quota); | |
2267 | } else { | |
2268 | BUG(); | |
2269 | } | |
2270 | return ret; | |
2271 | } | |
2272 | ||
2273 | /* helper function to actually process a single delayed ref entry */ | |
2274 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, | |
2275 | struct btrfs_root *root, | |
2276 | struct btrfs_delayed_ref_node *node, | |
2277 | struct btrfs_delayed_extent_op *extent_op, | |
2278 | int insert_reserved) | |
2279 | { | |
2280 | int ret = 0; | |
2281 | ||
2282 | if (trans->aborted) { | |
2283 | if (insert_reserved) | |
2284 | btrfs_pin_extent(root, node->bytenr, | |
2285 | node->num_bytes, 1); | |
2286 | return 0; | |
2287 | } | |
2288 | ||
2289 | if (btrfs_delayed_ref_is_head(node)) { | |
2290 | struct btrfs_delayed_ref_head *head; | |
2291 | /* | |
2292 | * we've hit the end of the chain and we were supposed | |
2293 | * to insert this extent into the tree. But, it got | |
2294 | * deleted before we ever needed to insert it, so all | |
2295 | * we have to do is clean up the accounting | |
2296 | */ | |
2297 | BUG_ON(extent_op); | |
2298 | head = btrfs_delayed_node_to_head(node); | |
2299 | trace_run_delayed_ref_head(node, head, node->action); | |
2300 | ||
2301 | if (insert_reserved) { | |
2302 | btrfs_pin_extent(root, node->bytenr, | |
2303 | node->num_bytes, 1); | |
2304 | if (head->is_data) { | |
2305 | ret = btrfs_del_csums(trans, root, | |
2306 | node->bytenr, | |
2307 | node->num_bytes); | |
2308 | } | |
2309 | } | |
2310 | return ret; | |
2311 | } | |
2312 | ||
2313 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || | |
2314 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2315 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2316 | insert_reserved); | |
2317 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2318 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2319 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2320 | insert_reserved); | |
2321 | else | |
2322 | BUG(); | |
2323 | return ret; | |
2324 | } | |
2325 | ||
2326 | static inline struct btrfs_delayed_ref_node * | |
2327 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2328 | { | |
2329 | if (list_empty(&head->ref_list)) | |
2330 | return NULL; | |
2331 | ||
2332 | return list_entry(head->ref_list.next, struct btrfs_delayed_ref_node, | |
2333 | list); | |
2334 | } | |
2335 | ||
2336 | /* | |
2337 | * Returns 0 on success or if called with an already aborted transaction. | |
2338 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2339 | */ | |
2340 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2341 | struct btrfs_root *root, | |
2342 | unsigned long nr) | |
2343 | { | |
2344 | struct btrfs_delayed_ref_root *delayed_refs; | |
2345 | struct btrfs_delayed_ref_node *ref; | |
2346 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
2347 | struct btrfs_delayed_extent_op *extent_op; | |
2348 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2349 | ktime_t start = ktime_get(); | |
2350 | int ret; | |
2351 | unsigned long count = 0; | |
2352 | unsigned long actual_count = 0; | |
2353 | int must_insert_reserved = 0; | |
2354 | ||
2355 | delayed_refs = &trans->transaction->delayed_refs; | |
2356 | while (1) { | |
2357 | if (!locked_ref) { | |
2358 | if (count >= nr) | |
2359 | break; | |
2360 | ||
2361 | spin_lock(&delayed_refs->lock); | |
2362 | locked_ref = btrfs_select_ref_head(trans); | |
2363 | if (!locked_ref) { | |
2364 | spin_unlock(&delayed_refs->lock); | |
2365 | break; | |
2366 | } | |
2367 | ||
2368 | /* grab the lock that says we are going to process | |
2369 | * all the refs for this head */ | |
2370 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2371 | spin_unlock(&delayed_refs->lock); | |
2372 | /* | |
2373 | * we may have dropped the spin lock to get the head | |
2374 | * mutex lock, and that might have given someone else | |
2375 | * time to free the head. If that's true, it has been | |
2376 | * removed from our list and we can move on. | |
2377 | */ | |
2378 | if (ret == -EAGAIN) { | |
2379 | locked_ref = NULL; | |
2380 | count++; | |
2381 | continue; | |
2382 | } | |
2383 | } | |
2384 | ||
2385 | spin_lock(&locked_ref->lock); | |
2386 | ||
2387 | /* | |
2388 | * locked_ref is the head node, so we have to go one | |
2389 | * node back for any delayed ref updates | |
2390 | */ | |
2391 | ref = select_delayed_ref(locked_ref); | |
2392 | ||
2393 | if (ref && ref->seq && | |
2394 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { | |
2395 | spin_unlock(&locked_ref->lock); | |
2396 | btrfs_delayed_ref_unlock(locked_ref); | |
2397 | spin_lock(&delayed_refs->lock); | |
2398 | locked_ref->processing = 0; | |
2399 | delayed_refs->num_heads_ready++; | |
2400 | spin_unlock(&delayed_refs->lock); | |
2401 | locked_ref = NULL; | |
2402 | cond_resched(); | |
2403 | count++; | |
2404 | continue; | |
2405 | } | |
2406 | ||
2407 | /* | |
2408 | * record the must insert reserved flag before we | |
2409 | * drop the spin lock. | |
2410 | */ | |
2411 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2412 | locked_ref->must_insert_reserved = 0; | |
2413 | ||
2414 | extent_op = locked_ref->extent_op; | |
2415 | locked_ref->extent_op = NULL; | |
2416 | ||
2417 | if (!ref) { | |
2418 | ||
2419 | ||
2420 | /* All delayed refs have been processed, Go ahead | |
2421 | * and send the head node to run_one_delayed_ref, | |
2422 | * so that any accounting fixes can happen | |
2423 | */ | |
2424 | ref = &locked_ref->node; | |
2425 | ||
2426 | if (extent_op && must_insert_reserved) { | |
2427 | btrfs_free_delayed_extent_op(extent_op); | |
2428 | extent_op = NULL; | |
2429 | } | |
2430 | ||
2431 | if (extent_op) { | |
2432 | spin_unlock(&locked_ref->lock); | |
2433 | ret = run_delayed_extent_op(trans, root, | |
2434 | ref, extent_op); | |
2435 | btrfs_free_delayed_extent_op(extent_op); | |
2436 | ||
2437 | if (ret) { | |
2438 | /* | |
2439 | * Need to reset must_insert_reserved if | |
2440 | * there was an error so the abort stuff | |
2441 | * can cleanup the reserved space | |
2442 | * properly. | |
2443 | */ | |
2444 | if (must_insert_reserved) | |
2445 | locked_ref->must_insert_reserved = 1; | |
2446 | locked_ref->processing = 0; | |
2447 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); | |
2448 | btrfs_delayed_ref_unlock(locked_ref); | |
2449 | return ret; | |
2450 | } | |
2451 | continue; | |
2452 | } | |
2453 | ||
2454 | /* | |
2455 | * Need to drop our head ref lock and re-aqcuire the | |
2456 | * delayed ref lock and then re-check to make sure | |
2457 | * nobody got added. | |
2458 | */ | |
2459 | spin_unlock(&locked_ref->lock); | |
2460 | spin_lock(&delayed_refs->lock); | |
2461 | spin_lock(&locked_ref->lock); | |
2462 | if (!list_empty(&locked_ref->ref_list) || | |
2463 | locked_ref->extent_op) { | |
2464 | spin_unlock(&locked_ref->lock); | |
2465 | spin_unlock(&delayed_refs->lock); | |
2466 | continue; | |
2467 | } | |
2468 | ref->in_tree = 0; | |
2469 | delayed_refs->num_heads--; | |
2470 | rb_erase(&locked_ref->href_node, | |
2471 | &delayed_refs->href_root); | |
2472 | spin_unlock(&delayed_refs->lock); | |
2473 | } else { | |
2474 | actual_count++; | |
2475 | ref->in_tree = 0; | |
2476 | list_del(&ref->list); | |
2477 | } | |
2478 | atomic_dec(&delayed_refs->num_entries); | |
2479 | ||
2480 | if (!btrfs_delayed_ref_is_head(ref)) { | |
2481 | /* | |
2482 | * when we play the delayed ref, also correct the | |
2483 | * ref_mod on head | |
2484 | */ | |
2485 | switch (ref->action) { | |
2486 | case BTRFS_ADD_DELAYED_REF: | |
2487 | case BTRFS_ADD_DELAYED_EXTENT: | |
2488 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2489 | break; | |
2490 | case BTRFS_DROP_DELAYED_REF: | |
2491 | locked_ref->node.ref_mod += ref->ref_mod; | |
2492 | break; | |
2493 | default: | |
2494 | WARN_ON(1); | |
2495 | } | |
2496 | } | |
2497 | spin_unlock(&locked_ref->lock); | |
2498 | ||
2499 | ret = run_one_delayed_ref(trans, root, ref, extent_op, | |
2500 | must_insert_reserved); | |
2501 | ||
2502 | btrfs_free_delayed_extent_op(extent_op); | |
2503 | if (ret) { | |
2504 | locked_ref->processing = 0; | |
2505 | btrfs_delayed_ref_unlock(locked_ref); | |
2506 | btrfs_put_delayed_ref(ref); | |
2507 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret); | |
2508 | return ret; | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * If this node is a head, that means all the refs in this head | |
2513 | * have been dealt with, and we will pick the next head to deal | |
2514 | * with, so we must unlock the head and drop it from the cluster | |
2515 | * list before we release it. | |
2516 | */ | |
2517 | if (btrfs_delayed_ref_is_head(ref)) { | |
2518 | if (locked_ref->is_data && | |
2519 | locked_ref->total_ref_mod < 0) { | |
2520 | spin_lock(&delayed_refs->lock); | |
2521 | delayed_refs->pending_csums -= ref->num_bytes; | |
2522 | spin_unlock(&delayed_refs->lock); | |
2523 | } | |
2524 | btrfs_delayed_ref_unlock(locked_ref); | |
2525 | locked_ref = NULL; | |
2526 | } | |
2527 | btrfs_put_delayed_ref(ref); | |
2528 | count++; | |
2529 | cond_resched(); | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * We don't want to include ref heads since we can have empty ref heads | |
2534 | * and those will drastically skew our runtime down since we just do | |
2535 | * accounting, no actual extent tree updates. | |
2536 | */ | |
2537 | if (actual_count > 0) { | |
2538 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2539 | u64 avg; | |
2540 | ||
2541 | /* | |
2542 | * We weigh the current average higher than our current runtime | |
2543 | * to avoid large swings in the average. | |
2544 | */ | |
2545 | spin_lock(&delayed_refs->lock); | |
2546 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
2547 | fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */ | |
2548 | spin_unlock(&delayed_refs->lock); | |
2549 | } | |
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | #ifdef SCRAMBLE_DELAYED_REFS | |
2554 | /* | |
2555 | * Normally delayed refs get processed in ascending bytenr order. This | |
2556 | * correlates in most cases to the order added. To expose dependencies on this | |
2557 | * order, we start to process the tree in the middle instead of the beginning | |
2558 | */ | |
2559 | static u64 find_middle(struct rb_root *root) | |
2560 | { | |
2561 | struct rb_node *n = root->rb_node; | |
2562 | struct btrfs_delayed_ref_node *entry; | |
2563 | int alt = 1; | |
2564 | u64 middle; | |
2565 | u64 first = 0, last = 0; | |
2566 | ||
2567 | n = rb_first(root); | |
2568 | if (n) { | |
2569 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2570 | first = entry->bytenr; | |
2571 | } | |
2572 | n = rb_last(root); | |
2573 | if (n) { | |
2574 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2575 | last = entry->bytenr; | |
2576 | } | |
2577 | n = root->rb_node; | |
2578 | ||
2579 | while (n) { | |
2580 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2581 | WARN_ON(!entry->in_tree); | |
2582 | ||
2583 | middle = entry->bytenr; | |
2584 | ||
2585 | if (alt) | |
2586 | n = n->rb_left; | |
2587 | else | |
2588 | n = n->rb_right; | |
2589 | ||
2590 | alt = 1 - alt; | |
2591 | } | |
2592 | return middle; | |
2593 | } | |
2594 | #endif | |
2595 | ||
2596 | static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads) | |
2597 | { | |
2598 | u64 num_bytes; | |
2599 | ||
2600 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2601 | sizeof(struct btrfs_extent_inline_ref)); | |
2602 | if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) | |
2603 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); | |
2604 | ||
2605 | /* | |
2606 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
2607 | * closer to what we're really going to want to ouse. | |
2608 | */ | |
2609 | return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root)); | |
2610 | } | |
2611 | ||
2612 | /* | |
2613 | * Takes the number of bytes to be csumm'ed and figures out how many leaves it | |
2614 | * would require to store the csums for that many bytes. | |
2615 | */ | |
2616 | u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes) | |
2617 | { | |
2618 | u64 csum_size; | |
2619 | u64 num_csums_per_leaf; | |
2620 | u64 num_csums; | |
2621 | ||
2622 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
2623 | num_csums_per_leaf = div64_u64(csum_size, | |
2624 | (u64)btrfs_super_csum_size(root->fs_info->super_copy)); | |
2625 | num_csums = div64_u64(csum_bytes, root->sectorsize); | |
2626 | num_csums += num_csums_per_leaf - 1; | |
2627 | num_csums = div64_u64(num_csums, num_csums_per_leaf); | |
2628 | return num_csums; | |
2629 | } | |
2630 | ||
2631 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, | |
2632 | struct btrfs_root *root) | |
2633 | { | |
2634 | struct btrfs_block_rsv *global_rsv; | |
2635 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
2636 | u64 csum_bytes = trans->transaction->delayed_refs.pending_csums; | |
2637 | u64 num_dirty_bgs = trans->transaction->num_dirty_bgs; | |
2638 | u64 num_bytes, num_dirty_bgs_bytes; | |
2639 | int ret = 0; | |
2640 | ||
2641 | num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
2642 | num_heads = heads_to_leaves(root, num_heads); | |
2643 | if (num_heads > 1) | |
2644 | num_bytes += (num_heads - 1) * root->nodesize; | |
2645 | num_bytes <<= 1; | |
2646 | num_bytes += btrfs_csum_bytes_to_leaves(root, csum_bytes) * root->nodesize; | |
2647 | num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(root, | |
2648 | num_dirty_bgs); | |
2649 | global_rsv = &root->fs_info->global_block_rsv; | |
2650 | ||
2651 | /* | |
2652 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2653 | * wiggle room since running delayed refs can create more delayed refs. | |
2654 | */ | |
2655 | if (global_rsv->space_info->full) { | |
2656 | num_dirty_bgs_bytes <<= 1; | |
2657 | num_bytes <<= 1; | |
2658 | } | |
2659 | ||
2660 | spin_lock(&global_rsv->lock); | |
2661 | if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes) | |
2662 | ret = 1; | |
2663 | spin_unlock(&global_rsv->lock); | |
2664 | return ret; | |
2665 | } | |
2666 | ||
2667 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, | |
2668 | struct btrfs_root *root) | |
2669 | { | |
2670 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2671 | u64 num_entries = | |
2672 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2673 | u64 avg_runtime; | |
2674 | u64 val; | |
2675 | ||
2676 | smp_mb(); | |
2677 | avg_runtime = fs_info->avg_delayed_ref_runtime; | |
2678 | val = num_entries * avg_runtime; | |
2679 | if (num_entries * avg_runtime >= NSEC_PER_SEC) | |
2680 | return 1; | |
2681 | if (val >= NSEC_PER_SEC / 2) | |
2682 | return 2; | |
2683 | ||
2684 | return btrfs_check_space_for_delayed_refs(trans, root); | |
2685 | } | |
2686 | ||
2687 | struct async_delayed_refs { | |
2688 | struct btrfs_root *root; | |
2689 | int count; | |
2690 | int error; | |
2691 | int sync; | |
2692 | struct completion wait; | |
2693 | struct btrfs_work work; | |
2694 | }; | |
2695 | ||
2696 | static void delayed_ref_async_start(struct btrfs_work *work) | |
2697 | { | |
2698 | struct async_delayed_refs *async; | |
2699 | struct btrfs_trans_handle *trans; | |
2700 | int ret; | |
2701 | ||
2702 | async = container_of(work, struct async_delayed_refs, work); | |
2703 | ||
2704 | trans = btrfs_join_transaction(async->root); | |
2705 | if (IS_ERR(trans)) { | |
2706 | async->error = PTR_ERR(trans); | |
2707 | goto done; | |
2708 | } | |
2709 | ||
2710 | /* | |
2711 | * trans->sync means that when we call end_transaciton, we won't | |
2712 | * wait on delayed refs | |
2713 | */ | |
2714 | trans->sync = true; | |
2715 | ret = btrfs_run_delayed_refs(trans, async->root, async->count); | |
2716 | if (ret) | |
2717 | async->error = ret; | |
2718 | ||
2719 | ret = btrfs_end_transaction(trans, async->root); | |
2720 | if (ret && !async->error) | |
2721 | async->error = ret; | |
2722 | done: | |
2723 | if (async->sync) | |
2724 | complete(&async->wait); | |
2725 | else | |
2726 | kfree(async); | |
2727 | } | |
2728 | ||
2729 | int btrfs_async_run_delayed_refs(struct btrfs_root *root, | |
2730 | unsigned long count, int wait) | |
2731 | { | |
2732 | struct async_delayed_refs *async; | |
2733 | int ret; | |
2734 | ||
2735 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
2736 | if (!async) | |
2737 | return -ENOMEM; | |
2738 | ||
2739 | async->root = root->fs_info->tree_root; | |
2740 | async->count = count; | |
2741 | async->error = 0; | |
2742 | if (wait) | |
2743 | async->sync = 1; | |
2744 | else | |
2745 | async->sync = 0; | |
2746 | init_completion(&async->wait); | |
2747 | ||
2748 | btrfs_init_work(&async->work, btrfs_extent_refs_helper, | |
2749 | delayed_ref_async_start, NULL, NULL); | |
2750 | ||
2751 | btrfs_queue_work(root->fs_info->extent_workers, &async->work); | |
2752 | ||
2753 | if (wait) { | |
2754 | wait_for_completion(&async->wait); | |
2755 | ret = async->error; | |
2756 | kfree(async); | |
2757 | return ret; | |
2758 | } | |
2759 | return 0; | |
2760 | } | |
2761 | ||
2762 | /* | |
2763 | * this starts processing the delayed reference count updates and | |
2764 | * extent insertions we have queued up so far. count can be | |
2765 | * 0, which means to process everything in the tree at the start | |
2766 | * of the run (but not newly added entries), or it can be some target | |
2767 | * number you'd like to process. | |
2768 | * | |
2769 | * Returns 0 on success or if called with an aborted transaction | |
2770 | * Returns <0 on error and aborts the transaction | |
2771 | */ | |
2772 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2773 | struct btrfs_root *root, unsigned long count) | |
2774 | { | |
2775 | struct rb_node *node; | |
2776 | struct btrfs_delayed_ref_root *delayed_refs; | |
2777 | struct btrfs_delayed_ref_head *head; | |
2778 | int ret; | |
2779 | int run_all = count == (unsigned long)-1; | |
2780 | ||
2781 | /* We'll clean this up in btrfs_cleanup_transaction */ | |
2782 | if (trans->aborted) | |
2783 | return 0; | |
2784 | ||
2785 | if (root == root->fs_info->extent_root) | |
2786 | root = root->fs_info->tree_root; | |
2787 | ||
2788 | delayed_refs = &trans->transaction->delayed_refs; | |
2789 | if (count == 0) | |
2790 | count = atomic_read(&delayed_refs->num_entries) * 2; | |
2791 | ||
2792 | again: | |
2793 | #ifdef SCRAMBLE_DELAYED_REFS | |
2794 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2795 | #endif | |
2796 | ret = __btrfs_run_delayed_refs(trans, root, count); | |
2797 | if (ret < 0) { | |
2798 | btrfs_abort_transaction(trans, root, ret); | |
2799 | return ret; | |
2800 | } | |
2801 | ||
2802 | if (run_all) { | |
2803 | if (!list_empty(&trans->new_bgs)) | |
2804 | btrfs_create_pending_block_groups(trans, root); | |
2805 | ||
2806 | spin_lock(&delayed_refs->lock); | |
2807 | node = rb_first(&delayed_refs->href_root); | |
2808 | if (!node) { | |
2809 | spin_unlock(&delayed_refs->lock); | |
2810 | goto out; | |
2811 | } | |
2812 | count = (unsigned long)-1; | |
2813 | ||
2814 | while (node) { | |
2815 | head = rb_entry(node, struct btrfs_delayed_ref_head, | |
2816 | href_node); | |
2817 | if (btrfs_delayed_ref_is_head(&head->node)) { | |
2818 | struct btrfs_delayed_ref_node *ref; | |
2819 | ||
2820 | ref = &head->node; | |
2821 | atomic_inc(&ref->refs); | |
2822 | ||
2823 | spin_unlock(&delayed_refs->lock); | |
2824 | /* | |
2825 | * Mutex was contended, block until it's | |
2826 | * released and try again | |
2827 | */ | |
2828 | mutex_lock(&head->mutex); | |
2829 | mutex_unlock(&head->mutex); | |
2830 | ||
2831 | btrfs_put_delayed_ref(ref); | |
2832 | cond_resched(); | |
2833 | goto again; | |
2834 | } else { | |
2835 | WARN_ON(1); | |
2836 | } | |
2837 | node = rb_next(node); | |
2838 | } | |
2839 | spin_unlock(&delayed_refs->lock); | |
2840 | cond_resched(); | |
2841 | goto again; | |
2842 | } | |
2843 | out: | |
2844 | ret = btrfs_delayed_qgroup_accounting(trans, root->fs_info); | |
2845 | if (ret) | |
2846 | return ret; | |
2847 | assert_qgroups_uptodate(trans); | |
2848 | return 0; | |
2849 | } | |
2850 | ||
2851 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, | |
2852 | struct btrfs_root *root, | |
2853 | u64 bytenr, u64 num_bytes, u64 flags, | |
2854 | int level, int is_data) | |
2855 | { | |
2856 | struct btrfs_delayed_extent_op *extent_op; | |
2857 | int ret; | |
2858 | ||
2859 | extent_op = btrfs_alloc_delayed_extent_op(); | |
2860 | if (!extent_op) | |
2861 | return -ENOMEM; | |
2862 | ||
2863 | extent_op->flags_to_set = flags; | |
2864 | extent_op->update_flags = 1; | |
2865 | extent_op->update_key = 0; | |
2866 | extent_op->is_data = is_data ? 1 : 0; | |
2867 | extent_op->level = level; | |
2868 | ||
2869 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, | |
2870 | num_bytes, extent_op); | |
2871 | if (ret) | |
2872 | btrfs_free_delayed_extent_op(extent_op); | |
2873 | return ret; | |
2874 | } | |
2875 | ||
2876 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2877 | struct btrfs_root *root, | |
2878 | struct btrfs_path *path, | |
2879 | u64 objectid, u64 offset, u64 bytenr) | |
2880 | { | |
2881 | struct btrfs_delayed_ref_head *head; | |
2882 | struct btrfs_delayed_ref_node *ref; | |
2883 | struct btrfs_delayed_data_ref *data_ref; | |
2884 | struct btrfs_delayed_ref_root *delayed_refs; | |
2885 | int ret = 0; | |
2886 | ||
2887 | delayed_refs = &trans->transaction->delayed_refs; | |
2888 | spin_lock(&delayed_refs->lock); | |
2889 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2890 | if (!head) { | |
2891 | spin_unlock(&delayed_refs->lock); | |
2892 | return 0; | |
2893 | } | |
2894 | ||
2895 | if (!mutex_trylock(&head->mutex)) { | |
2896 | atomic_inc(&head->node.refs); | |
2897 | spin_unlock(&delayed_refs->lock); | |
2898 | ||
2899 | btrfs_release_path(path); | |
2900 | ||
2901 | /* | |
2902 | * Mutex was contended, block until it's released and let | |
2903 | * caller try again | |
2904 | */ | |
2905 | mutex_lock(&head->mutex); | |
2906 | mutex_unlock(&head->mutex); | |
2907 | btrfs_put_delayed_ref(&head->node); | |
2908 | return -EAGAIN; | |
2909 | } | |
2910 | spin_unlock(&delayed_refs->lock); | |
2911 | ||
2912 | spin_lock(&head->lock); | |
2913 | list_for_each_entry(ref, &head->ref_list, list) { | |
2914 | /* If it's a shared ref we know a cross reference exists */ | |
2915 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
2916 | ret = 1; | |
2917 | break; | |
2918 | } | |
2919 | ||
2920 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2921 | ||
2922 | /* | |
2923 | * If our ref doesn't match the one we're currently looking at | |
2924 | * then we have a cross reference. | |
2925 | */ | |
2926 | if (data_ref->root != root->root_key.objectid || | |
2927 | data_ref->objectid != objectid || | |
2928 | data_ref->offset != offset) { | |
2929 | ret = 1; | |
2930 | break; | |
2931 | } | |
2932 | } | |
2933 | spin_unlock(&head->lock); | |
2934 | mutex_unlock(&head->mutex); | |
2935 | return ret; | |
2936 | } | |
2937 | ||
2938 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2939 | struct btrfs_root *root, | |
2940 | struct btrfs_path *path, | |
2941 | u64 objectid, u64 offset, u64 bytenr) | |
2942 | { | |
2943 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
2944 | struct extent_buffer *leaf; | |
2945 | struct btrfs_extent_data_ref *ref; | |
2946 | struct btrfs_extent_inline_ref *iref; | |
2947 | struct btrfs_extent_item *ei; | |
2948 | struct btrfs_key key; | |
2949 | u32 item_size; | |
2950 | int ret; | |
2951 | ||
2952 | key.objectid = bytenr; | |
2953 | key.offset = (u64)-1; | |
2954 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2955 | ||
2956 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
2957 | if (ret < 0) | |
2958 | goto out; | |
2959 | BUG_ON(ret == 0); /* Corruption */ | |
2960 | ||
2961 | ret = -ENOENT; | |
2962 | if (path->slots[0] == 0) | |
2963 | goto out; | |
2964 | ||
2965 | path->slots[0]--; | |
2966 | leaf = path->nodes[0]; | |
2967 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2968 | ||
2969 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) | |
2970 | goto out; | |
2971 | ||
2972 | ret = 1; | |
2973 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2974 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2975 | if (item_size < sizeof(*ei)) { | |
2976 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2977 | goto out; | |
2978 | } | |
2979 | #endif | |
2980 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2981 | ||
2982 | if (item_size != sizeof(*ei) + | |
2983 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2984 | goto out; | |
2985 | ||
2986 | if (btrfs_extent_generation(leaf, ei) <= | |
2987 | btrfs_root_last_snapshot(&root->root_item)) | |
2988 | goto out; | |
2989 | ||
2990 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2991 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2992 | BTRFS_EXTENT_DATA_REF_KEY) | |
2993 | goto out; | |
2994 | ||
2995 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2996 | if (btrfs_extent_refs(leaf, ei) != | |
2997 | btrfs_extent_data_ref_count(leaf, ref) || | |
2998 | btrfs_extent_data_ref_root(leaf, ref) != | |
2999 | root->root_key.objectid || | |
3000 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
3001 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
3002 | goto out; | |
3003 | ||
3004 | ret = 0; | |
3005 | out: | |
3006 | return ret; | |
3007 | } | |
3008 | ||
3009 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
3010 | struct btrfs_root *root, | |
3011 | u64 objectid, u64 offset, u64 bytenr) | |
3012 | { | |
3013 | struct btrfs_path *path; | |
3014 | int ret; | |
3015 | int ret2; | |
3016 | ||
3017 | path = btrfs_alloc_path(); | |
3018 | if (!path) | |
3019 | return -ENOENT; | |
3020 | ||
3021 | do { | |
3022 | ret = check_committed_ref(trans, root, path, objectid, | |
3023 | offset, bytenr); | |
3024 | if (ret && ret != -ENOENT) | |
3025 | goto out; | |
3026 | ||
3027 | ret2 = check_delayed_ref(trans, root, path, objectid, | |
3028 | offset, bytenr); | |
3029 | } while (ret2 == -EAGAIN); | |
3030 | ||
3031 | if (ret2 && ret2 != -ENOENT) { | |
3032 | ret = ret2; | |
3033 | goto out; | |
3034 | } | |
3035 | ||
3036 | if (ret != -ENOENT || ret2 != -ENOENT) | |
3037 | ret = 0; | |
3038 | out: | |
3039 | btrfs_free_path(path); | |
3040 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
3041 | WARN_ON(ret > 0); | |
3042 | return ret; | |
3043 | } | |
3044 | ||
3045 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, | |
3046 | struct btrfs_root *root, | |
3047 | struct extent_buffer *buf, | |
3048 | int full_backref, int inc) | |
3049 | { | |
3050 | u64 bytenr; | |
3051 | u64 num_bytes; | |
3052 | u64 parent; | |
3053 | u64 ref_root; | |
3054 | u32 nritems; | |
3055 | struct btrfs_key key; | |
3056 | struct btrfs_file_extent_item *fi; | |
3057 | int i; | |
3058 | int level; | |
3059 | int ret = 0; | |
3060 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, | |
3061 | u64, u64, u64, u64, u64, u64, int); | |
3062 | ||
3063 | ||
3064 | if (btrfs_test_is_dummy_root(root)) | |
3065 | return 0; | |
3066 | ||
3067 | ref_root = btrfs_header_owner(buf); | |
3068 | nritems = btrfs_header_nritems(buf); | |
3069 | level = btrfs_header_level(buf); | |
3070 | ||
3071 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) | |
3072 | return 0; | |
3073 | ||
3074 | if (inc) | |
3075 | process_func = btrfs_inc_extent_ref; | |
3076 | else | |
3077 | process_func = btrfs_free_extent; | |
3078 | ||
3079 | if (full_backref) | |
3080 | parent = buf->start; | |
3081 | else | |
3082 | parent = 0; | |
3083 | ||
3084 | for (i = 0; i < nritems; i++) { | |
3085 | if (level == 0) { | |
3086 | btrfs_item_key_to_cpu(buf, &key, i); | |
3087 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
3088 | continue; | |
3089 | fi = btrfs_item_ptr(buf, i, | |
3090 | struct btrfs_file_extent_item); | |
3091 | if (btrfs_file_extent_type(buf, fi) == | |
3092 | BTRFS_FILE_EXTENT_INLINE) | |
3093 | continue; | |
3094 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3095 | if (bytenr == 0) | |
3096 | continue; | |
3097 | ||
3098 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3099 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
3100 | ret = process_func(trans, root, bytenr, num_bytes, | |
3101 | parent, ref_root, key.objectid, | |
3102 | key.offset, 1); | |
3103 | if (ret) | |
3104 | goto fail; | |
3105 | } else { | |
3106 | bytenr = btrfs_node_blockptr(buf, i); | |
3107 | num_bytes = root->nodesize; | |
3108 | ret = process_func(trans, root, bytenr, num_bytes, | |
3109 | parent, ref_root, level - 1, 0, | |
3110 | 1); | |
3111 | if (ret) | |
3112 | goto fail; | |
3113 | } | |
3114 | } | |
3115 | return 0; | |
3116 | fail: | |
3117 | return ret; | |
3118 | } | |
3119 | ||
3120 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
3121 | struct extent_buffer *buf, int full_backref) | |
3122 | { | |
3123 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); | |
3124 | } | |
3125 | ||
3126 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
3127 | struct extent_buffer *buf, int full_backref) | |
3128 | { | |
3129 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); | |
3130 | } | |
3131 | ||
3132 | static int write_one_cache_group(struct btrfs_trans_handle *trans, | |
3133 | struct btrfs_root *root, | |
3134 | struct btrfs_path *path, | |
3135 | struct btrfs_block_group_cache *cache) | |
3136 | { | |
3137 | int ret; | |
3138 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
3139 | unsigned long bi; | |
3140 | struct extent_buffer *leaf; | |
3141 | ||
3142 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); | |
3143 | if (ret) { | |
3144 | if (ret > 0) | |
3145 | ret = -ENOENT; | |
3146 | goto fail; | |
3147 | } | |
3148 | ||
3149 | leaf = path->nodes[0]; | |
3150 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3151 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3152 | btrfs_mark_buffer_dirty(leaf); | |
3153 | fail: | |
3154 | btrfs_release_path(path); | |
3155 | return ret; | |
3156 | ||
3157 | } | |
3158 | ||
3159 | static struct btrfs_block_group_cache * | |
3160 | next_block_group(struct btrfs_root *root, | |
3161 | struct btrfs_block_group_cache *cache) | |
3162 | { | |
3163 | struct rb_node *node; | |
3164 | ||
3165 | spin_lock(&root->fs_info->block_group_cache_lock); | |
3166 | ||
3167 | /* If our block group was removed, we need a full search. */ | |
3168 | if (RB_EMPTY_NODE(&cache->cache_node)) { | |
3169 | const u64 next_bytenr = cache->key.objectid + cache->key.offset; | |
3170 | ||
3171 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3172 | btrfs_put_block_group(cache); | |
3173 | cache = btrfs_lookup_first_block_group(root->fs_info, | |
3174 | next_bytenr); | |
3175 | return cache; | |
3176 | } | |
3177 | node = rb_next(&cache->cache_node); | |
3178 | btrfs_put_block_group(cache); | |
3179 | if (node) { | |
3180 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3181 | cache_node); | |
3182 | btrfs_get_block_group(cache); | |
3183 | } else | |
3184 | cache = NULL; | |
3185 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
3186 | return cache; | |
3187 | } | |
3188 | ||
3189 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, | |
3190 | struct btrfs_trans_handle *trans, | |
3191 | struct btrfs_path *path) | |
3192 | { | |
3193 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
3194 | struct inode *inode = NULL; | |
3195 | u64 alloc_hint = 0; | |
3196 | int dcs = BTRFS_DC_ERROR; | |
3197 | u64 num_pages = 0; | |
3198 | int retries = 0; | |
3199 | int ret = 0; | |
3200 | ||
3201 | /* | |
3202 | * If this block group is smaller than 100 megs don't bother caching the | |
3203 | * block group. | |
3204 | */ | |
3205 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
3206 | spin_lock(&block_group->lock); | |
3207 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3208 | spin_unlock(&block_group->lock); | |
3209 | return 0; | |
3210 | } | |
3211 | ||
3212 | if (trans->aborted) | |
3213 | return 0; | |
3214 | again: | |
3215 | inode = lookup_free_space_inode(root, block_group, path); | |
3216 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3217 | ret = PTR_ERR(inode); | |
3218 | btrfs_release_path(path); | |
3219 | goto out; | |
3220 | } | |
3221 | ||
3222 | if (IS_ERR(inode)) { | |
3223 | BUG_ON(retries); | |
3224 | retries++; | |
3225 | ||
3226 | if (block_group->ro) | |
3227 | goto out_free; | |
3228 | ||
3229 | ret = create_free_space_inode(root, trans, block_group, path); | |
3230 | if (ret) | |
3231 | goto out_free; | |
3232 | goto again; | |
3233 | } | |
3234 | ||
3235 | /* We've already setup this transaction, go ahead and exit */ | |
3236 | if (block_group->cache_generation == trans->transid && | |
3237 | i_size_read(inode)) { | |
3238 | dcs = BTRFS_DC_SETUP; | |
3239 | goto out_put; | |
3240 | } | |
3241 | ||
3242 | /* | |
3243 | * We want to set the generation to 0, that way if anything goes wrong | |
3244 | * from here on out we know not to trust this cache when we load up next | |
3245 | * time. | |
3246 | */ | |
3247 | BTRFS_I(inode)->generation = 0; | |
3248 | ret = btrfs_update_inode(trans, root, inode); | |
3249 | if (ret) { | |
3250 | /* | |
3251 | * So theoretically we could recover from this, simply set the | |
3252 | * super cache generation to 0 so we know to invalidate the | |
3253 | * cache, but then we'd have to keep track of the block groups | |
3254 | * that fail this way so we know we _have_ to reset this cache | |
3255 | * before the next commit or risk reading stale cache. So to | |
3256 | * limit our exposure to horrible edge cases lets just abort the | |
3257 | * transaction, this only happens in really bad situations | |
3258 | * anyway. | |
3259 | */ | |
3260 | btrfs_abort_transaction(trans, root, ret); | |
3261 | goto out_put; | |
3262 | } | |
3263 | WARN_ON(ret); | |
3264 | ||
3265 | if (i_size_read(inode) > 0) { | |
3266 | ret = btrfs_check_trunc_cache_free_space(root, | |
3267 | &root->fs_info->global_block_rsv); | |
3268 | if (ret) | |
3269 | goto out_put; | |
3270 | ||
3271 | ret = btrfs_truncate_free_space_cache(root, trans, NULL, inode); | |
3272 | if (ret) | |
3273 | goto out_put; | |
3274 | } | |
3275 | ||
3276 | spin_lock(&block_group->lock); | |
3277 | if (block_group->cached != BTRFS_CACHE_FINISHED || | |
3278 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3279 | /* | |
3280 | * don't bother trying to write stuff out _if_ | |
3281 | * a) we're not cached, | |
3282 | * b) we're with nospace_cache mount option. | |
3283 | */ | |
3284 | dcs = BTRFS_DC_WRITTEN; | |
3285 | spin_unlock(&block_group->lock); | |
3286 | goto out_put; | |
3287 | } | |
3288 | spin_unlock(&block_group->lock); | |
3289 | ||
3290 | /* | |
3291 | * Try to preallocate enough space based on how big the block group is. | |
3292 | * Keep in mind this has to include any pinned space which could end up | |
3293 | * taking up quite a bit since it's not folded into the other space | |
3294 | * cache. | |
3295 | */ | |
3296 | num_pages = div_u64(block_group->key.offset, 256 * 1024 * 1024); | |
3297 | if (!num_pages) | |
3298 | num_pages = 1; | |
3299 | ||
3300 | num_pages *= 16; | |
3301 | num_pages *= PAGE_CACHE_SIZE; | |
3302 | ||
3303 | ret = btrfs_check_data_free_space(inode, num_pages, num_pages); | |
3304 | if (ret) | |
3305 | goto out_put; | |
3306 | ||
3307 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3308 | num_pages, num_pages, | |
3309 | &alloc_hint); | |
3310 | if (!ret) | |
3311 | dcs = BTRFS_DC_SETUP; | |
3312 | btrfs_free_reserved_data_space(inode, num_pages); | |
3313 | ||
3314 | out_put: | |
3315 | iput(inode); | |
3316 | out_free: | |
3317 | btrfs_release_path(path); | |
3318 | out: | |
3319 | spin_lock(&block_group->lock); | |
3320 | if (!ret && dcs == BTRFS_DC_SETUP) | |
3321 | block_group->cache_generation = trans->transid; | |
3322 | block_group->disk_cache_state = dcs; | |
3323 | spin_unlock(&block_group->lock); | |
3324 | ||
3325 | return ret; | |
3326 | } | |
3327 | ||
3328 | int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, | |
3329 | struct btrfs_root *root) | |
3330 | { | |
3331 | struct btrfs_block_group_cache *cache, *tmp; | |
3332 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3333 | struct btrfs_path *path; | |
3334 | ||
3335 | if (list_empty(&cur_trans->dirty_bgs) || | |
3336 | !btrfs_test_opt(root, SPACE_CACHE)) | |
3337 | return 0; | |
3338 | ||
3339 | path = btrfs_alloc_path(); | |
3340 | if (!path) | |
3341 | return -ENOMEM; | |
3342 | ||
3343 | /* Could add new block groups, use _safe just in case */ | |
3344 | list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, | |
3345 | dirty_list) { | |
3346 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3347 | cache_save_setup(cache, trans, path); | |
3348 | } | |
3349 | ||
3350 | btrfs_free_path(path); | |
3351 | return 0; | |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * transaction commit does final block group cache writeback during a | |
3356 | * critical section where nothing is allowed to change the FS. This is | |
3357 | * required in order for the cache to actually match the block group, | |
3358 | * but can introduce a lot of latency into the commit. | |
3359 | * | |
3360 | * So, btrfs_start_dirty_block_groups is here to kick off block group | |
3361 | * cache IO. There's a chance we'll have to redo some of it if the | |
3362 | * block group changes again during the commit, but it greatly reduces | |
3363 | * the commit latency by getting rid of the easy block groups while | |
3364 | * we're still allowing others to join the commit. | |
3365 | */ | |
3366 | int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans, | |
3367 | struct btrfs_root *root) | |
3368 | { | |
3369 | struct btrfs_block_group_cache *cache; | |
3370 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3371 | int ret = 0; | |
3372 | int should_put; | |
3373 | struct btrfs_path *path = NULL; | |
3374 | LIST_HEAD(dirty); | |
3375 | struct list_head *io = &cur_trans->io_bgs; | |
3376 | int num_started = 0; | |
3377 | int loops = 0; | |
3378 | ||
3379 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3380 | if (list_empty(&cur_trans->dirty_bgs)) { | |
3381 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3382 | return 0; | |
3383 | } | |
3384 | list_splice_init(&cur_trans->dirty_bgs, &dirty); | |
3385 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3386 | ||
3387 | again: | |
3388 | /* | |
3389 | * make sure all the block groups on our dirty list actually | |
3390 | * exist | |
3391 | */ | |
3392 | btrfs_create_pending_block_groups(trans, root); | |
3393 | ||
3394 | if (!path) { | |
3395 | path = btrfs_alloc_path(); | |
3396 | if (!path) | |
3397 | return -ENOMEM; | |
3398 | } | |
3399 | ||
3400 | /* | |
3401 | * cache_write_mutex is here only to save us from balance or automatic | |
3402 | * removal of empty block groups deleting this block group while we are | |
3403 | * writing out the cache | |
3404 | */ | |
3405 | mutex_lock(&trans->transaction->cache_write_mutex); | |
3406 | while (!list_empty(&dirty)) { | |
3407 | cache = list_first_entry(&dirty, | |
3408 | struct btrfs_block_group_cache, | |
3409 | dirty_list); | |
3410 | /* | |
3411 | * this can happen if something re-dirties a block | |
3412 | * group that is already under IO. Just wait for it to | |
3413 | * finish and then do it all again | |
3414 | */ | |
3415 | if (!list_empty(&cache->io_list)) { | |
3416 | list_del_init(&cache->io_list); | |
3417 | btrfs_wait_cache_io(root, trans, cache, | |
3418 | &cache->io_ctl, path, | |
3419 | cache->key.objectid); | |
3420 | btrfs_put_block_group(cache); | |
3421 | } | |
3422 | ||
3423 | ||
3424 | /* | |
3425 | * btrfs_wait_cache_io uses the cache->dirty_list to decide | |
3426 | * if it should update the cache_state. Don't delete | |
3427 | * until after we wait. | |
3428 | * | |
3429 | * Since we're not running in the commit critical section | |
3430 | * we need the dirty_bgs_lock to protect from update_block_group | |
3431 | */ | |
3432 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3433 | list_del_init(&cache->dirty_list); | |
3434 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3435 | ||
3436 | should_put = 1; | |
3437 | ||
3438 | cache_save_setup(cache, trans, path); | |
3439 | ||
3440 | if (cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3441 | cache->io_ctl.inode = NULL; | |
3442 | ret = btrfs_write_out_cache(root, trans, cache, path); | |
3443 | if (ret == 0 && cache->io_ctl.inode) { | |
3444 | num_started++; | |
3445 | should_put = 0; | |
3446 | ||
3447 | /* | |
3448 | * the cache_write_mutex is protecting | |
3449 | * the io_list | |
3450 | */ | |
3451 | list_add_tail(&cache->io_list, io); | |
3452 | } else { | |
3453 | /* | |
3454 | * if we failed to write the cache, the | |
3455 | * generation will be bad and life goes on | |
3456 | */ | |
3457 | ret = 0; | |
3458 | } | |
3459 | } | |
3460 | if (!ret) { | |
3461 | ret = write_one_cache_group(trans, root, path, cache); | |
3462 | /* | |
3463 | * Our block group might still be attached to the list | |
3464 | * of new block groups in the transaction handle of some | |
3465 | * other task (struct btrfs_trans_handle->new_bgs). This | |
3466 | * means its block group item isn't yet in the extent | |
3467 | * tree. If this happens ignore the error, as we will | |
3468 | * try again later in the critical section of the | |
3469 | * transaction commit. | |
3470 | */ | |
3471 | if (ret == -ENOENT) { | |
3472 | ret = 0; | |
3473 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3474 | if (list_empty(&cache->dirty_list)) { | |
3475 | list_add_tail(&cache->dirty_list, | |
3476 | &cur_trans->dirty_bgs); | |
3477 | btrfs_get_block_group(cache); | |
3478 | } | |
3479 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3480 | } else if (ret) { | |
3481 | btrfs_abort_transaction(trans, root, ret); | |
3482 | } | |
3483 | } | |
3484 | ||
3485 | /* if its not on the io list, we need to put the block group */ | |
3486 | if (should_put) | |
3487 | btrfs_put_block_group(cache); | |
3488 | ||
3489 | if (ret) | |
3490 | break; | |
3491 | ||
3492 | /* | |
3493 | * Avoid blocking other tasks for too long. It might even save | |
3494 | * us from writing caches for block groups that are going to be | |
3495 | * removed. | |
3496 | */ | |
3497 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
3498 | mutex_lock(&trans->transaction->cache_write_mutex); | |
3499 | } | |
3500 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
3501 | ||
3502 | /* | |
3503 | * go through delayed refs for all the stuff we've just kicked off | |
3504 | * and then loop back (just once) | |
3505 | */ | |
3506 | ret = btrfs_run_delayed_refs(trans, root, 0); | |
3507 | if (!ret && loops == 0) { | |
3508 | loops++; | |
3509 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3510 | list_splice_init(&cur_trans->dirty_bgs, &dirty); | |
3511 | /* | |
3512 | * dirty_bgs_lock protects us from concurrent block group | |
3513 | * deletes too (not just cache_write_mutex). | |
3514 | */ | |
3515 | if (!list_empty(&dirty)) { | |
3516 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3517 | goto again; | |
3518 | } | |
3519 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3520 | } | |
3521 | ||
3522 | btrfs_free_path(path); | |
3523 | return ret; | |
3524 | } | |
3525 | ||
3526 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, | |
3527 | struct btrfs_root *root) | |
3528 | { | |
3529 | struct btrfs_block_group_cache *cache; | |
3530 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3531 | int ret = 0; | |
3532 | int should_put; | |
3533 | struct btrfs_path *path; | |
3534 | struct list_head *io = &cur_trans->io_bgs; | |
3535 | int num_started = 0; | |
3536 | ||
3537 | path = btrfs_alloc_path(); | |
3538 | if (!path) | |
3539 | return -ENOMEM; | |
3540 | ||
3541 | /* | |
3542 | * We don't need the lock here since we are protected by the transaction | |
3543 | * commit. We want to do the cache_save_setup first and then run the | |
3544 | * delayed refs to make sure we have the best chance at doing this all | |
3545 | * in one shot. | |
3546 | */ | |
3547 | while (!list_empty(&cur_trans->dirty_bgs)) { | |
3548 | cache = list_first_entry(&cur_trans->dirty_bgs, | |
3549 | struct btrfs_block_group_cache, | |
3550 | dirty_list); | |
3551 | ||
3552 | /* | |
3553 | * this can happen if cache_save_setup re-dirties a block | |
3554 | * group that is already under IO. Just wait for it to | |
3555 | * finish and then do it all again | |
3556 | */ | |
3557 | if (!list_empty(&cache->io_list)) { | |
3558 | list_del_init(&cache->io_list); | |
3559 | btrfs_wait_cache_io(root, trans, cache, | |
3560 | &cache->io_ctl, path, | |
3561 | cache->key.objectid); | |
3562 | btrfs_put_block_group(cache); | |
3563 | } | |
3564 | ||
3565 | /* | |
3566 | * don't remove from the dirty list until after we've waited | |
3567 | * on any pending IO | |
3568 | */ | |
3569 | list_del_init(&cache->dirty_list); | |
3570 | should_put = 1; | |
3571 | ||
3572 | cache_save_setup(cache, trans, path); | |
3573 | ||
3574 | if (!ret) | |
3575 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long) -1); | |
3576 | ||
3577 | if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3578 | cache->io_ctl.inode = NULL; | |
3579 | ret = btrfs_write_out_cache(root, trans, cache, path); | |
3580 | if (ret == 0 && cache->io_ctl.inode) { | |
3581 | num_started++; | |
3582 | should_put = 0; | |
3583 | list_add_tail(&cache->io_list, io); | |
3584 | } else { | |
3585 | /* | |
3586 | * if we failed to write the cache, the | |
3587 | * generation will be bad and life goes on | |
3588 | */ | |
3589 | ret = 0; | |
3590 | } | |
3591 | } | |
3592 | if (!ret) { | |
3593 | ret = write_one_cache_group(trans, root, path, cache); | |
3594 | if (ret) | |
3595 | btrfs_abort_transaction(trans, root, ret); | |
3596 | } | |
3597 | ||
3598 | /* if its not on the io list, we need to put the block group */ | |
3599 | if (should_put) | |
3600 | btrfs_put_block_group(cache); | |
3601 | } | |
3602 | ||
3603 | while (!list_empty(io)) { | |
3604 | cache = list_first_entry(io, struct btrfs_block_group_cache, | |
3605 | io_list); | |
3606 | list_del_init(&cache->io_list); | |
3607 | btrfs_wait_cache_io(root, trans, cache, | |
3608 | &cache->io_ctl, path, cache->key.objectid); | |
3609 | btrfs_put_block_group(cache); | |
3610 | } | |
3611 | ||
3612 | btrfs_free_path(path); | |
3613 | return ret; | |
3614 | } | |
3615 | ||
3616 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) | |
3617 | { | |
3618 | struct btrfs_block_group_cache *block_group; | |
3619 | int readonly = 0; | |
3620 | ||
3621 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3622 | if (!block_group || block_group->ro) | |
3623 | readonly = 1; | |
3624 | if (block_group) | |
3625 | btrfs_put_block_group(block_group); | |
3626 | return readonly; | |
3627 | } | |
3628 | ||
3629 | static const char *alloc_name(u64 flags) | |
3630 | { | |
3631 | switch (flags) { | |
3632 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
3633 | return "mixed"; | |
3634 | case BTRFS_BLOCK_GROUP_METADATA: | |
3635 | return "metadata"; | |
3636 | case BTRFS_BLOCK_GROUP_DATA: | |
3637 | return "data"; | |
3638 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
3639 | return "system"; | |
3640 | default: | |
3641 | WARN_ON(1); | |
3642 | return "invalid-combination"; | |
3643 | }; | |
3644 | } | |
3645 | ||
3646 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, | |
3647 | u64 total_bytes, u64 bytes_used, | |
3648 | struct btrfs_space_info **space_info) | |
3649 | { | |
3650 | struct btrfs_space_info *found; | |
3651 | int i; | |
3652 | int factor; | |
3653 | int ret; | |
3654 | ||
3655 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3656 | BTRFS_BLOCK_GROUP_RAID10)) | |
3657 | factor = 2; | |
3658 | else | |
3659 | factor = 1; | |
3660 | ||
3661 | found = __find_space_info(info, flags); | |
3662 | if (found) { | |
3663 | spin_lock(&found->lock); | |
3664 | found->total_bytes += total_bytes; | |
3665 | found->disk_total += total_bytes * factor; | |
3666 | found->bytes_used += bytes_used; | |
3667 | found->disk_used += bytes_used * factor; | |
3668 | if (total_bytes > 0) | |
3669 | found->full = 0; | |
3670 | spin_unlock(&found->lock); | |
3671 | *space_info = found; | |
3672 | return 0; | |
3673 | } | |
3674 | found = kzalloc(sizeof(*found), GFP_NOFS); | |
3675 | if (!found) | |
3676 | return -ENOMEM; | |
3677 | ||
3678 | ret = percpu_counter_init(&found->total_bytes_pinned, 0, GFP_KERNEL); | |
3679 | if (ret) { | |
3680 | kfree(found); | |
3681 | return ret; | |
3682 | } | |
3683 | ||
3684 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
3685 | INIT_LIST_HEAD(&found->block_groups[i]); | |
3686 | init_rwsem(&found->groups_sem); | |
3687 | spin_lock_init(&found->lock); | |
3688 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3689 | found->total_bytes = total_bytes; | |
3690 | found->disk_total = total_bytes * factor; | |
3691 | found->bytes_used = bytes_used; | |
3692 | found->disk_used = bytes_used * factor; | |
3693 | found->bytes_pinned = 0; | |
3694 | found->bytes_reserved = 0; | |
3695 | found->bytes_readonly = 0; | |
3696 | found->bytes_may_use = 0; | |
3697 | if (total_bytes > 0) | |
3698 | found->full = 0; | |
3699 | else | |
3700 | found->full = 1; | |
3701 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; | |
3702 | found->chunk_alloc = 0; | |
3703 | found->flush = 0; | |
3704 | init_waitqueue_head(&found->wait); | |
3705 | INIT_LIST_HEAD(&found->ro_bgs); | |
3706 | ||
3707 | ret = kobject_init_and_add(&found->kobj, &space_info_ktype, | |
3708 | info->space_info_kobj, "%s", | |
3709 | alloc_name(found->flags)); | |
3710 | if (ret) { | |
3711 | kfree(found); | |
3712 | return ret; | |
3713 | } | |
3714 | ||
3715 | *space_info = found; | |
3716 | list_add_rcu(&found->list, &info->space_info); | |
3717 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3718 | info->data_sinfo = found; | |
3719 | ||
3720 | return ret; | |
3721 | } | |
3722 | ||
3723 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) | |
3724 | { | |
3725 | u64 extra_flags = chunk_to_extended(flags) & | |
3726 | BTRFS_EXTENDED_PROFILE_MASK; | |
3727 | ||
3728 | write_seqlock(&fs_info->profiles_lock); | |
3729 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3730 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3731 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3732 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3733 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3734 | fs_info->avail_system_alloc_bits |= extra_flags; | |
3735 | write_sequnlock(&fs_info->profiles_lock); | |
3736 | } | |
3737 | ||
3738 | /* | |
3739 | * returns target flags in extended format or 0 if restripe for this | |
3740 | * chunk_type is not in progress | |
3741 | * | |
3742 | * should be called with either volume_mutex or balance_lock held | |
3743 | */ | |
3744 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3745 | { | |
3746 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3747 | u64 target = 0; | |
3748 | ||
3749 | if (!bctl) | |
3750 | return 0; | |
3751 | ||
3752 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3753 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3754 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3755 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3756 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3757 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3758 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3759 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3760 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3761 | } | |
3762 | ||
3763 | return target; | |
3764 | } | |
3765 | ||
3766 | /* | |
3767 | * @flags: available profiles in extended format (see ctree.h) | |
3768 | * | |
3769 | * Returns reduced profile in chunk format. If profile changing is in | |
3770 | * progress (either running or paused) picks the target profile (if it's | |
3771 | * already available), otherwise falls back to plain reducing. | |
3772 | */ | |
3773 | static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) | |
3774 | { | |
3775 | u64 num_devices = root->fs_info->fs_devices->rw_devices; | |
3776 | u64 target; | |
3777 | u64 tmp; | |
3778 | ||
3779 | /* | |
3780 | * see if restripe for this chunk_type is in progress, if so | |
3781 | * try to reduce to the target profile | |
3782 | */ | |
3783 | spin_lock(&root->fs_info->balance_lock); | |
3784 | target = get_restripe_target(root->fs_info, flags); | |
3785 | if (target) { | |
3786 | /* pick target profile only if it's already available */ | |
3787 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
3788 | spin_unlock(&root->fs_info->balance_lock); | |
3789 | return extended_to_chunk(target); | |
3790 | } | |
3791 | } | |
3792 | spin_unlock(&root->fs_info->balance_lock); | |
3793 | ||
3794 | /* First, mask out the RAID levels which aren't possible */ | |
3795 | if (num_devices == 1) | |
3796 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | | |
3797 | BTRFS_BLOCK_GROUP_RAID5); | |
3798 | if (num_devices < 3) | |
3799 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
3800 | if (num_devices < 4) | |
3801 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3802 | ||
3803 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | | |
3804 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3805 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3806 | flags &= ~tmp; | |
3807 | ||
3808 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) | |
3809 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3810 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3811 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3812 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3813 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3814 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3815 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3816 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3817 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
3818 | ||
3819 | return extended_to_chunk(flags | tmp); | |
3820 | } | |
3821 | ||
3822 | static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags) | |
3823 | { | |
3824 | unsigned seq; | |
3825 | u64 flags; | |
3826 | ||
3827 | do { | |
3828 | flags = orig_flags; | |
3829 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3830 | ||
3831 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3832 | flags |= root->fs_info->avail_data_alloc_bits; | |
3833 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3834 | flags |= root->fs_info->avail_system_alloc_bits; | |
3835 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3836 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3837 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
3838 | ||
3839 | return btrfs_reduce_alloc_profile(root, flags); | |
3840 | } | |
3841 | ||
3842 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) | |
3843 | { | |
3844 | u64 flags; | |
3845 | u64 ret; | |
3846 | ||
3847 | if (data) | |
3848 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3849 | else if (root == root->fs_info->chunk_root) | |
3850 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
3851 | else | |
3852 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
3853 | ||
3854 | ret = get_alloc_profile(root, flags); | |
3855 | return ret; | |
3856 | } | |
3857 | ||
3858 | /* | |
3859 | * This will check the space that the inode allocates from to make sure we have | |
3860 | * enough space for bytes. | |
3861 | */ | |
3862 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes) | |
3863 | { | |
3864 | struct btrfs_space_info *data_sinfo; | |
3865 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3866 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3867 | u64 used; | |
3868 | int ret = 0; | |
3869 | int need_commit = 2; | |
3870 | int have_pinned_space; | |
3871 | ||
3872 | /* make sure bytes are sectorsize aligned */ | |
3873 | bytes = ALIGN(bytes, root->sectorsize); | |
3874 | ||
3875 | if (btrfs_is_free_space_inode(inode)) { | |
3876 | need_commit = 0; | |
3877 | ASSERT(current->journal_info); | |
3878 | } | |
3879 | ||
3880 | data_sinfo = fs_info->data_sinfo; | |
3881 | if (!data_sinfo) | |
3882 | goto alloc; | |
3883 | ||
3884 | again: | |
3885 | /* make sure we have enough space to handle the data first */ | |
3886 | spin_lock(&data_sinfo->lock); | |
3887 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + | |
3888 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3889 | data_sinfo->bytes_may_use; | |
3890 | ||
3891 | if (used + bytes > data_sinfo->total_bytes) { | |
3892 | struct btrfs_trans_handle *trans; | |
3893 | ||
3894 | /* | |
3895 | * if we don't have enough free bytes in this space then we need | |
3896 | * to alloc a new chunk. | |
3897 | */ | |
3898 | if (!data_sinfo->full) { | |
3899 | u64 alloc_target; | |
3900 | ||
3901 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; | |
3902 | spin_unlock(&data_sinfo->lock); | |
3903 | alloc: | |
3904 | alloc_target = btrfs_get_alloc_profile(root, 1); | |
3905 | /* | |
3906 | * It is ugly that we don't call nolock join | |
3907 | * transaction for the free space inode case here. | |
3908 | * But it is safe because we only do the data space | |
3909 | * reservation for the free space cache in the | |
3910 | * transaction context, the common join transaction | |
3911 | * just increase the counter of the current transaction | |
3912 | * handler, doesn't try to acquire the trans_lock of | |
3913 | * the fs. | |
3914 | */ | |
3915 | trans = btrfs_join_transaction(root); | |
3916 | if (IS_ERR(trans)) | |
3917 | return PTR_ERR(trans); | |
3918 | ||
3919 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
3920 | alloc_target, | |
3921 | CHUNK_ALLOC_NO_FORCE); | |
3922 | btrfs_end_transaction(trans, root); | |
3923 | if (ret < 0) { | |
3924 | if (ret != -ENOSPC) | |
3925 | return ret; | |
3926 | else { | |
3927 | have_pinned_space = 1; | |
3928 | goto commit_trans; | |
3929 | } | |
3930 | } | |
3931 | ||
3932 | if (!data_sinfo) | |
3933 | data_sinfo = fs_info->data_sinfo; | |
3934 | ||
3935 | goto again; | |
3936 | } | |
3937 | ||
3938 | /* | |
3939 | * If we don't have enough pinned space to deal with this | |
3940 | * allocation, and no removed chunk in current transaction, | |
3941 | * don't bother committing the transaction. | |
3942 | */ | |
3943 | have_pinned_space = percpu_counter_compare( | |
3944 | &data_sinfo->total_bytes_pinned, | |
3945 | used + bytes - data_sinfo->total_bytes); | |
3946 | spin_unlock(&data_sinfo->lock); | |
3947 | ||
3948 | /* commit the current transaction and try again */ | |
3949 | commit_trans: | |
3950 | if (need_commit && | |
3951 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
3952 | need_commit--; | |
3953 | ||
3954 | trans = btrfs_join_transaction(root); | |
3955 | if (IS_ERR(trans)) | |
3956 | return PTR_ERR(trans); | |
3957 | if (have_pinned_space >= 0 || | |
3958 | trans->transaction->have_free_bgs || | |
3959 | need_commit > 0) { | |
3960 | ret = btrfs_commit_transaction(trans, root); | |
3961 | if (ret) | |
3962 | return ret; | |
3963 | /* | |
3964 | * make sure that all running delayed iput are | |
3965 | * done | |
3966 | */ | |
3967 | down_write(&root->fs_info->delayed_iput_sem); | |
3968 | up_write(&root->fs_info->delayed_iput_sem); | |
3969 | goto again; | |
3970 | } else { | |
3971 | btrfs_end_transaction(trans, root); | |
3972 | } | |
3973 | } | |
3974 | ||
3975 | trace_btrfs_space_reservation(root->fs_info, | |
3976 | "space_info:enospc", | |
3977 | data_sinfo->flags, bytes, 1); | |
3978 | return -ENOSPC; | |
3979 | } | |
3980 | ret = btrfs_qgroup_reserve(root, write_bytes); | |
3981 | if (ret) | |
3982 | goto out; | |
3983 | data_sinfo->bytes_may_use += bytes; | |
3984 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
3985 | data_sinfo->flags, bytes, 1); | |
3986 | out: | |
3987 | spin_unlock(&data_sinfo->lock); | |
3988 | ||
3989 | return ret; | |
3990 | } | |
3991 | ||
3992 | /* | |
3993 | * Called if we need to clear a data reservation for this inode. | |
3994 | */ | |
3995 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) | |
3996 | { | |
3997 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3998 | struct btrfs_space_info *data_sinfo; | |
3999 | ||
4000 | /* make sure bytes are sectorsize aligned */ | |
4001 | bytes = ALIGN(bytes, root->sectorsize); | |
4002 | ||
4003 | data_sinfo = root->fs_info->data_sinfo; | |
4004 | spin_lock(&data_sinfo->lock); | |
4005 | WARN_ON(data_sinfo->bytes_may_use < bytes); | |
4006 | data_sinfo->bytes_may_use -= bytes; | |
4007 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4008 | data_sinfo->flags, bytes, 0); | |
4009 | spin_unlock(&data_sinfo->lock); | |
4010 | } | |
4011 | ||
4012 | static void force_metadata_allocation(struct btrfs_fs_info *info) | |
4013 | { | |
4014 | struct list_head *head = &info->space_info; | |
4015 | struct btrfs_space_info *found; | |
4016 | ||
4017 | rcu_read_lock(); | |
4018 | list_for_each_entry_rcu(found, head, list) { | |
4019 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
4020 | found->force_alloc = CHUNK_ALLOC_FORCE; | |
4021 | } | |
4022 | rcu_read_unlock(); | |
4023 | } | |
4024 | ||
4025 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) | |
4026 | { | |
4027 | return (global->size << 1); | |
4028 | } | |
4029 | ||
4030 | static int should_alloc_chunk(struct btrfs_root *root, | |
4031 | struct btrfs_space_info *sinfo, int force) | |
4032 | { | |
4033 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4034 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; | |
4035 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; | |
4036 | u64 thresh; | |
4037 | ||
4038 | if (force == CHUNK_ALLOC_FORCE) | |
4039 | return 1; | |
4040 | ||
4041 | /* | |
4042 | * We need to take into account the global rsv because for all intents | |
4043 | * and purposes it's used space. Don't worry about locking the | |
4044 | * global_rsv, it doesn't change except when the transaction commits. | |
4045 | */ | |
4046 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) | |
4047 | num_allocated += calc_global_rsv_need_space(global_rsv); | |
4048 | ||
4049 | /* | |
4050 | * in limited mode, we want to have some free space up to | |
4051 | * about 1% of the FS size. | |
4052 | */ | |
4053 | if (force == CHUNK_ALLOC_LIMITED) { | |
4054 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); | |
4055 | thresh = max_t(u64, 64 * 1024 * 1024, | |
4056 | div_factor_fine(thresh, 1)); | |
4057 | ||
4058 | if (num_bytes - num_allocated < thresh) | |
4059 | return 1; | |
4060 | } | |
4061 | ||
4062 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) | |
4063 | return 0; | |
4064 | return 1; | |
4065 | } | |
4066 | ||
4067 | static u64 get_profile_num_devs(struct btrfs_root *root, u64 type) | |
4068 | { | |
4069 | u64 num_dev; | |
4070 | ||
4071 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | | |
4072 | BTRFS_BLOCK_GROUP_RAID0 | | |
4073 | BTRFS_BLOCK_GROUP_RAID5 | | |
4074 | BTRFS_BLOCK_GROUP_RAID6)) | |
4075 | num_dev = root->fs_info->fs_devices->rw_devices; | |
4076 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
4077 | num_dev = 2; | |
4078 | else | |
4079 | num_dev = 1; /* DUP or single */ | |
4080 | ||
4081 | return num_dev; | |
4082 | } | |
4083 | ||
4084 | /* | |
4085 | * If @is_allocation is true, reserve space in the system space info necessary | |
4086 | * for allocating a chunk, otherwise if it's false, reserve space necessary for | |
4087 | * removing a chunk. | |
4088 | */ | |
4089 | void check_system_chunk(struct btrfs_trans_handle *trans, | |
4090 | struct btrfs_root *root, | |
4091 | u64 type) | |
4092 | { | |
4093 | struct btrfs_space_info *info; | |
4094 | u64 left; | |
4095 | u64 thresh; | |
4096 | int ret = 0; | |
4097 | u64 num_devs; | |
4098 | ||
4099 | /* | |
4100 | * Needed because we can end up allocating a system chunk and for an | |
4101 | * atomic and race free space reservation in the chunk block reserve. | |
4102 | */ | |
4103 | ASSERT(mutex_is_locked(&root->fs_info->chunk_mutex)); | |
4104 | ||
4105 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
4106 | spin_lock(&info->lock); | |
4107 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
4108 | info->bytes_reserved - info->bytes_readonly - | |
4109 | info->bytes_may_use; | |
4110 | spin_unlock(&info->lock); | |
4111 | ||
4112 | num_devs = get_profile_num_devs(root, type); | |
4113 | ||
4114 | /* num_devs device items to update and 1 chunk item to add or remove */ | |
4115 | thresh = btrfs_calc_trunc_metadata_size(root, num_devs) + | |
4116 | btrfs_calc_trans_metadata_size(root, 1); | |
4117 | ||
4118 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
4119 | btrfs_info(root->fs_info, "left=%llu, need=%llu, flags=%llu", | |
4120 | left, thresh, type); | |
4121 | dump_space_info(info, 0, 0); | |
4122 | } | |
4123 | ||
4124 | if (left < thresh) { | |
4125 | u64 flags; | |
4126 | ||
4127 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
4128 | /* | |
4129 | * Ignore failure to create system chunk. We might end up not | |
4130 | * needing it, as we might not need to COW all nodes/leafs from | |
4131 | * the paths we visit in the chunk tree (they were already COWed | |
4132 | * or created in the current transaction for example). | |
4133 | */ | |
4134 | ret = btrfs_alloc_chunk(trans, root, flags); | |
4135 | } | |
4136 | ||
4137 | if (!ret) { | |
4138 | ret = btrfs_block_rsv_add(root->fs_info->chunk_root, | |
4139 | &root->fs_info->chunk_block_rsv, | |
4140 | thresh, BTRFS_RESERVE_NO_FLUSH); | |
4141 | if (!ret) | |
4142 | trans->chunk_bytes_reserved += thresh; | |
4143 | } | |
4144 | } | |
4145 | ||
4146 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, | |
4147 | struct btrfs_root *extent_root, u64 flags, int force) | |
4148 | { | |
4149 | struct btrfs_space_info *space_info; | |
4150 | struct btrfs_fs_info *fs_info = extent_root->fs_info; | |
4151 | int wait_for_alloc = 0; | |
4152 | int ret = 0; | |
4153 | ||
4154 | /* Don't re-enter if we're already allocating a chunk */ | |
4155 | if (trans->allocating_chunk) | |
4156 | return -ENOSPC; | |
4157 | ||
4158 | space_info = __find_space_info(extent_root->fs_info, flags); | |
4159 | if (!space_info) { | |
4160 | ret = update_space_info(extent_root->fs_info, flags, | |
4161 | 0, 0, &space_info); | |
4162 | BUG_ON(ret); /* -ENOMEM */ | |
4163 | } | |
4164 | BUG_ON(!space_info); /* Logic error */ | |
4165 | ||
4166 | again: | |
4167 | spin_lock(&space_info->lock); | |
4168 | if (force < space_info->force_alloc) | |
4169 | force = space_info->force_alloc; | |
4170 | if (space_info->full) { | |
4171 | if (should_alloc_chunk(extent_root, space_info, force)) | |
4172 | ret = -ENOSPC; | |
4173 | else | |
4174 | ret = 0; | |
4175 | spin_unlock(&space_info->lock); | |
4176 | return ret; | |
4177 | } | |
4178 | ||
4179 | if (!should_alloc_chunk(extent_root, space_info, force)) { | |
4180 | spin_unlock(&space_info->lock); | |
4181 | return 0; | |
4182 | } else if (space_info->chunk_alloc) { | |
4183 | wait_for_alloc = 1; | |
4184 | } else { | |
4185 | space_info->chunk_alloc = 1; | |
4186 | } | |
4187 | ||
4188 | spin_unlock(&space_info->lock); | |
4189 | ||
4190 | mutex_lock(&fs_info->chunk_mutex); | |
4191 | ||
4192 | /* | |
4193 | * The chunk_mutex is held throughout the entirety of a chunk | |
4194 | * allocation, so once we've acquired the chunk_mutex we know that the | |
4195 | * other guy is done and we need to recheck and see if we should | |
4196 | * allocate. | |
4197 | */ | |
4198 | if (wait_for_alloc) { | |
4199 | mutex_unlock(&fs_info->chunk_mutex); | |
4200 | wait_for_alloc = 0; | |
4201 | goto again; | |
4202 | } | |
4203 | ||
4204 | trans->allocating_chunk = true; | |
4205 | ||
4206 | /* | |
4207 | * If we have mixed data/metadata chunks we want to make sure we keep | |
4208 | * allocating mixed chunks instead of individual chunks. | |
4209 | */ | |
4210 | if (btrfs_mixed_space_info(space_info)) | |
4211 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
4212 | ||
4213 | /* | |
4214 | * if we're doing a data chunk, go ahead and make sure that | |
4215 | * we keep a reasonable number of metadata chunks allocated in the | |
4216 | * FS as well. | |
4217 | */ | |
4218 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { | |
4219 | fs_info->data_chunk_allocations++; | |
4220 | if (!(fs_info->data_chunk_allocations % | |
4221 | fs_info->metadata_ratio)) | |
4222 | force_metadata_allocation(fs_info); | |
4223 | } | |
4224 | ||
4225 | /* | |
4226 | * Check if we have enough space in SYSTEM chunk because we may need | |
4227 | * to update devices. | |
4228 | */ | |
4229 | check_system_chunk(trans, extent_root, flags); | |
4230 | ||
4231 | ret = btrfs_alloc_chunk(trans, extent_root, flags); | |
4232 | trans->allocating_chunk = false; | |
4233 | ||
4234 | spin_lock(&space_info->lock); | |
4235 | if (ret < 0 && ret != -ENOSPC) | |
4236 | goto out; | |
4237 | if (ret) | |
4238 | space_info->full = 1; | |
4239 | else | |
4240 | ret = 1; | |
4241 | ||
4242 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; | |
4243 | out: | |
4244 | space_info->chunk_alloc = 0; | |
4245 | spin_unlock(&space_info->lock); | |
4246 | mutex_unlock(&fs_info->chunk_mutex); | |
4247 | return ret; | |
4248 | } | |
4249 | ||
4250 | static int can_overcommit(struct btrfs_root *root, | |
4251 | struct btrfs_space_info *space_info, u64 bytes, | |
4252 | enum btrfs_reserve_flush_enum flush) | |
4253 | { | |
4254 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4255 | u64 profile = btrfs_get_alloc_profile(root, 0); | |
4256 | u64 space_size; | |
4257 | u64 avail; | |
4258 | u64 used; | |
4259 | ||
4260 | used = space_info->bytes_used + space_info->bytes_reserved + | |
4261 | space_info->bytes_pinned + space_info->bytes_readonly; | |
4262 | ||
4263 | /* | |
4264 | * We only want to allow over committing if we have lots of actual space | |
4265 | * free, but if we don't have enough space to handle the global reserve | |
4266 | * space then we could end up having a real enospc problem when trying | |
4267 | * to allocate a chunk or some other such important allocation. | |
4268 | */ | |
4269 | spin_lock(&global_rsv->lock); | |
4270 | space_size = calc_global_rsv_need_space(global_rsv); | |
4271 | spin_unlock(&global_rsv->lock); | |
4272 | if (used + space_size >= space_info->total_bytes) | |
4273 | return 0; | |
4274 | ||
4275 | used += space_info->bytes_may_use; | |
4276 | ||
4277 | spin_lock(&root->fs_info->free_chunk_lock); | |
4278 | avail = root->fs_info->free_chunk_space; | |
4279 | spin_unlock(&root->fs_info->free_chunk_lock); | |
4280 | ||
4281 | /* | |
4282 | * If we have dup, raid1 or raid10 then only half of the free | |
4283 | * space is actually useable. For raid56, the space info used | |
4284 | * doesn't include the parity drive, so we don't have to | |
4285 | * change the math | |
4286 | */ | |
4287 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
4288 | BTRFS_BLOCK_GROUP_RAID1 | | |
4289 | BTRFS_BLOCK_GROUP_RAID10)) | |
4290 | avail >>= 1; | |
4291 | ||
4292 | /* | |
4293 | * If we aren't flushing all things, let us overcommit up to | |
4294 | * 1/2th of the space. If we can flush, don't let us overcommit | |
4295 | * too much, let it overcommit up to 1/8 of the space. | |
4296 | */ | |
4297 | if (flush == BTRFS_RESERVE_FLUSH_ALL) | |
4298 | avail >>= 3; | |
4299 | else | |
4300 | avail >>= 1; | |
4301 | ||
4302 | if (used + bytes < space_info->total_bytes + avail) | |
4303 | return 1; | |
4304 | return 0; | |
4305 | } | |
4306 | ||
4307 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, | |
4308 | unsigned long nr_pages, int nr_items) | |
4309 | { | |
4310 | struct super_block *sb = root->fs_info->sb; | |
4311 | ||
4312 | if (down_read_trylock(&sb->s_umount)) { | |
4313 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
4314 | up_read(&sb->s_umount); | |
4315 | } else { | |
4316 | /* | |
4317 | * We needn't worry the filesystem going from r/w to r/o though | |
4318 | * we don't acquire ->s_umount mutex, because the filesystem | |
4319 | * should guarantee the delalloc inodes list be empty after | |
4320 | * the filesystem is readonly(all dirty pages are written to | |
4321 | * the disk). | |
4322 | */ | |
4323 | btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); | |
4324 | if (!current->journal_info) | |
4325 | btrfs_wait_ordered_roots(root->fs_info, nr_items); | |
4326 | } | |
4327 | } | |
4328 | ||
4329 | static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim) | |
4330 | { | |
4331 | u64 bytes; | |
4332 | int nr; | |
4333 | ||
4334 | bytes = btrfs_calc_trans_metadata_size(root, 1); | |
4335 | nr = (int)div64_u64(to_reclaim, bytes); | |
4336 | if (!nr) | |
4337 | nr = 1; | |
4338 | return nr; | |
4339 | } | |
4340 | ||
4341 | #define EXTENT_SIZE_PER_ITEM (256 * 1024) | |
4342 | ||
4343 | /* | |
4344 | * shrink metadata reservation for delalloc | |
4345 | */ | |
4346 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, | |
4347 | bool wait_ordered) | |
4348 | { | |
4349 | struct btrfs_block_rsv *block_rsv; | |
4350 | struct btrfs_space_info *space_info; | |
4351 | struct btrfs_trans_handle *trans; | |
4352 | u64 delalloc_bytes; | |
4353 | u64 max_reclaim; | |
4354 | long time_left; | |
4355 | unsigned long nr_pages; | |
4356 | int loops; | |
4357 | int items; | |
4358 | enum btrfs_reserve_flush_enum flush; | |
4359 | ||
4360 | /* Calc the number of the pages we need flush for space reservation */ | |
4361 | items = calc_reclaim_items_nr(root, to_reclaim); | |
4362 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; | |
4363 | ||
4364 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4365 | block_rsv = &root->fs_info->delalloc_block_rsv; | |
4366 | space_info = block_rsv->space_info; | |
4367 | ||
4368 | delalloc_bytes = percpu_counter_sum_positive( | |
4369 | &root->fs_info->delalloc_bytes); | |
4370 | if (delalloc_bytes == 0) { | |
4371 | if (trans) | |
4372 | return; | |
4373 | if (wait_ordered) | |
4374 | btrfs_wait_ordered_roots(root->fs_info, items); | |
4375 | return; | |
4376 | } | |
4377 | ||
4378 | loops = 0; | |
4379 | while (delalloc_bytes && loops < 3) { | |
4380 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
4381 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
4382 | btrfs_writeback_inodes_sb_nr(root, nr_pages, items); | |
4383 | /* | |
4384 | * We need to wait for the async pages to actually start before | |
4385 | * we do anything. | |
4386 | */ | |
4387 | max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages); | |
4388 | if (!max_reclaim) | |
4389 | goto skip_async; | |
4390 | ||
4391 | if (max_reclaim <= nr_pages) | |
4392 | max_reclaim = 0; | |
4393 | else | |
4394 | max_reclaim -= nr_pages; | |
4395 | ||
4396 | wait_event(root->fs_info->async_submit_wait, | |
4397 | atomic_read(&root->fs_info->async_delalloc_pages) <= | |
4398 | (int)max_reclaim); | |
4399 | skip_async: | |
4400 | if (!trans) | |
4401 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
4402 | else | |
4403 | flush = BTRFS_RESERVE_NO_FLUSH; | |
4404 | spin_lock(&space_info->lock); | |
4405 | if (can_overcommit(root, space_info, orig, flush)) { | |
4406 | spin_unlock(&space_info->lock); | |
4407 | break; | |
4408 | } | |
4409 | spin_unlock(&space_info->lock); | |
4410 | ||
4411 | loops++; | |
4412 | if (wait_ordered && !trans) { | |
4413 | btrfs_wait_ordered_roots(root->fs_info, items); | |
4414 | } else { | |
4415 | time_left = schedule_timeout_killable(1); | |
4416 | if (time_left) | |
4417 | break; | |
4418 | } | |
4419 | delalloc_bytes = percpu_counter_sum_positive( | |
4420 | &root->fs_info->delalloc_bytes); | |
4421 | } | |
4422 | } | |
4423 | ||
4424 | /** | |
4425 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4426 | * @root - the root we're allocating for | |
4427 | * @bytes - the number of bytes we want to reserve | |
4428 | * @force - force the commit | |
4429 | * | |
4430 | * This will check to make sure that committing the transaction will actually | |
4431 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4432 | * will return -ENOSPC. | |
4433 | */ | |
4434 | static int may_commit_transaction(struct btrfs_root *root, | |
4435 | struct btrfs_space_info *space_info, | |
4436 | u64 bytes, int force) | |
4437 | { | |
4438 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
4439 | struct btrfs_trans_handle *trans; | |
4440 | ||
4441 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4442 | if (trans) | |
4443 | return -EAGAIN; | |
4444 | ||
4445 | if (force) | |
4446 | goto commit; | |
4447 | ||
4448 | /* See if there is enough pinned space to make this reservation */ | |
4449 | if (percpu_counter_compare(&space_info->total_bytes_pinned, | |
4450 | bytes) >= 0) | |
4451 | goto commit; | |
4452 | ||
4453 | /* | |
4454 | * See if there is some space in the delayed insertion reservation for | |
4455 | * this reservation. | |
4456 | */ | |
4457 | if (space_info != delayed_rsv->space_info) | |
4458 | return -ENOSPC; | |
4459 | ||
4460 | spin_lock(&delayed_rsv->lock); | |
4461 | if (percpu_counter_compare(&space_info->total_bytes_pinned, | |
4462 | bytes - delayed_rsv->size) >= 0) { | |
4463 | spin_unlock(&delayed_rsv->lock); | |
4464 | return -ENOSPC; | |
4465 | } | |
4466 | spin_unlock(&delayed_rsv->lock); | |
4467 | ||
4468 | commit: | |
4469 | trans = btrfs_join_transaction(root); | |
4470 | if (IS_ERR(trans)) | |
4471 | return -ENOSPC; | |
4472 | ||
4473 | return btrfs_commit_transaction(trans, root); | |
4474 | } | |
4475 | ||
4476 | enum flush_state { | |
4477 | FLUSH_DELAYED_ITEMS_NR = 1, | |
4478 | FLUSH_DELAYED_ITEMS = 2, | |
4479 | FLUSH_DELALLOC = 3, | |
4480 | FLUSH_DELALLOC_WAIT = 4, | |
4481 | ALLOC_CHUNK = 5, | |
4482 | COMMIT_TRANS = 6, | |
4483 | }; | |
4484 | ||
4485 | static int flush_space(struct btrfs_root *root, | |
4486 | struct btrfs_space_info *space_info, u64 num_bytes, | |
4487 | u64 orig_bytes, int state) | |
4488 | { | |
4489 | struct btrfs_trans_handle *trans; | |
4490 | int nr; | |
4491 | int ret = 0; | |
4492 | ||
4493 | switch (state) { | |
4494 | case FLUSH_DELAYED_ITEMS_NR: | |
4495 | case FLUSH_DELAYED_ITEMS: | |
4496 | if (state == FLUSH_DELAYED_ITEMS_NR) | |
4497 | nr = calc_reclaim_items_nr(root, num_bytes) * 2; | |
4498 | else | |
4499 | nr = -1; | |
4500 | ||
4501 | trans = btrfs_join_transaction(root); | |
4502 | if (IS_ERR(trans)) { | |
4503 | ret = PTR_ERR(trans); | |
4504 | break; | |
4505 | } | |
4506 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
4507 | btrfs_end_transaction(trans, root); | |
4508 | break; | |
4509 | case FLUSH_DELALLOC: | |
4510 | case FLUSH_DELALLOC_WAIT: | |
4511 | shrink_delalloc(root, num_bytes * 2, orig_bytes, | |
4512 | state == FLUSH_DELALLOC_WAIT); | |
4513 | break; | |
4514 | case ALLOC_CHUNK: | |
4515 | trans = btrfs_join_transaction(root); | |
4516 | if (IS_ERR(trans)) { | |
4517 | ret = PTR_ERR(trans); | |
4518 | break; | |
4519 | } | |
4520 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
4521 | btrfs_get_alloc_profile(root, 0), | |
4522 | CHUNK_ALLOC_NO_FORCE); | |
4523 | btrfs_end_transaction(trans, root); | |
4524 | if (ret == -ENOSPC) | |
4525 | ret = 0; | |
4526 | break; | |
4527 | case COMMIT_TRANS: | |
4528 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4529 | break; | |
4530 | default: | |
4531 | ret = -ENOSPC; | |
4532 | break; | |
4533 | } | |
4534 | ||
4535 | return ret; | |
4536 | } | |
4537 | ||
4538 | static inline u64 | |
4539 | btrfs_calc_reclaim_metadata_size(struct btrfs_root *root, | |
4540 | struct btrfs_space_info *space_info) | |
4541 | { | |
4542 | u64 used; | |
4543 | u64 expected; | |
4544 | u64 to_reclaim; | |
4545 | ||
4546 | to_reclaim = min_t(u64, num_online_cpus() * 1024 * 1024, | |
4547 | 16 * 1024 * 1024); | |
4548 | spin_lock(&space_info->lock); | |
4549 | if (can_overcommit(root, space_info, to_reclaim, | |
4550 | BTRFS_RESERVE_FLUSH_ALL)) { | |
4551 | to_reclaim = 0; | |
4552 | goto out; | |
4553 | } | |
4554 | ||
4555 | used = space_info->bytes_used + space_info->bytes_reserved + | |
4556 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4557 | space_info->bytes_may_use; | |
4558 | if (can_overcommit(root, space_info, 1024 * 1024, | |
4559 | BTRFS_RESERVE_FLUSH_ALL)) | |
4560 | expected = div_factor_fine(space_info->total_bytes, 95); | |
4561 | else | |
4562 | expected = div_factor_fine(space_info->total_bytes, 90); | |
4563 | ||
4564 | if (used > expected) | |
4565 | to_reclaim = used - expected; | |
4566 | else | |
4567 | to_reclaim = 0; | |
4568 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + | |
4569 | space_info->bytes_reserved); | |
4570 | out: | |
4571 | spin_unlock(&space_info->lock); | |
4572 | ||
4573 | return to_reclaim; | |
4574 | } | |
4575 | ||
4576 | static inline int need_do_async_reclaim(struct btrfs_space_info *space_info, | |
4577 | struct btrfs_fs_info *fs_info, u64 used) | |
4578 | { | |
4579 | u64 thresh = div_factor_fine(space_info->total_bytes, 98); | |
4580 | ||
4581 | /* If we're just plain full then async reclaim just slows us down. */ | |
4582 | if (space_info->bytes_used >= thresh) | |
4583 | return 0; | |
4584 | ||
4585 | return (used >= thresh && !btrfs_fs_closing(fs_info) && | |
4586 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); | |
4587 | } | |
4588 | ||
4589 | static int btrfs_need_do_async_reclaim(struct btrfs_space_info *space_info, | |
4590 | struct btrfs_fs_info *fs_info, | |
4591 | int flush_state) | |
4592 | { | |
4593 | u64 used; | |
4594 | ||
4595 | spin_lock(&space_info->lock); | |
4596 | /* | |
4597 | * We run out of space and have not got any free space via flush_space, | |
4598 | * so don't bother doing async reclaim. | |
4599 | */ | |
4600 | if (flush_state > COMMIT_TRANS && space_info->full) { | |
4601 | spin_unlock(&space_info->lock); | |
4602 | return 0; | |
4603 | } | |
4604 | ||
4605 | used = space_info->bytes_used + space_info->bytes_reserved + | |
4606 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4607 | space_info->bytes_may_use; | |
4608 | if (need_do_async_reclaim(space_info, fs_info, used)) { | |
4609 | spin_unlock(&space_info->lock); | |
4610 | return 1; | |
4611 | } | |
4612 | spin_unlock(&space_info->lock); | |
4613 | ||
4614 | return 0; | |
4615 | } | |
4616 | ||
4617 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) | |
4618 | { | |
4619 | struct btrfs_fs_info *fs_info; | |
4620 | struct btrfs_space_info *space_info; | |
4621 | u64 to_reclaim; | |
4622 | int flush_state; | |
4623 | ||
4624 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); | |
4625 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
4626 | ||
4627 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root, | |
4628 | space_info); | |
4629 | if (!to_reclaim) | |
4630 | return; | |
4631 | ||
4632 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
4633 | do { | |
4634 | flush_space(fs_info->fs_root, space_info, to_reclaim, | |
4635 | to_reclaim, flush_state); | |
4636 | flush_state++; | |
4637 | if (!btrfs_need_do_async_reclaim(space_info, fs_info, | |
4638 | flush_state)) | |
4639 | return; | |
4640 | } while (flush_state < COMMIT_TRANS); | |
4641 | } | |
4642 | ||
4643 | void btrfs_init_async_reclaim_work(struct work_struct *work) | |
4644 | { | |
4645 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); | |
4646 | } | |
4647 | ||
4648 | /** | |
4649 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4650 | * @root - the root we're allocating for | |
4651 | * @block_rsv - the block_rsv we're allocating for | |
4652 | * @orig_bytes - the number of bytes we want | |
4653 | * @flush - whether or not we can flush to make our reservation | |
4654 | * | |
4655 | * This will reserve orgi_bytes number of bytes from the space info associated | |
4656 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4657 | * flush out space to make room. It will do this by flushing delalloc if | |
4658 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4659 | * regain reservations will be made and this will fail if there is not enough | |
4660 | * space already. | |
4661 | */ | |
4662 | static int reserve_metadata_bytes(struct btrfs_root *root, | |
4663 | struct btrfs_block_rsv *block_rsv, | |
4664 | u64 orig_bytes, | |
4665 | enum btrfs_reserve_flush_enum flush) | |
4666 | { | |
4667 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4668 | u64 used; | |
4669 | u64 num_bytes = orig_bytes; | |
4670 | int flush_state = FLUSH_DELAYED_ITEMS_NR; | |
4671 | int ret = 0; | |
4672 | bool flushing = false; | |
4673 | ||
4674 | again: | |
4675 | ret = 0; | |
4676 | spin_lock(&space_info->lock); | |
4677 | /* | |
4678 | * We only want to wait if somebody other than us is flushing and we | |
4679 | * are actually allowed to flush all things. | |
4680 | */ | |
4681 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && | |
4682 | space_info->flush) { | |
4683 | spin_unlock(&space_info->lock); | |
4684 | /* | |
4685 | * If we have a trans handle we can't wait because the flusher | |
4686 | * may have to commit the transaction, which would mean we would | |
4687 | * deadlock since we are waiting for the flusher to finish, but | |
4688 | * hold the current transaction open. | |
4689 | */ | |
4690 | if (current->journal_info) | |
4691 | return -EAGAIN; | |
4692 | ret = wait_event_killable(space_info->wait, !space_info->flush); | |
4693 | /* Must have been killed, return */ | |
4694 | if (ret) | |
4695 | return -EINTR; | |
4696 | ||
4697 | spin_lock(&space_info->lock); | |
4698 | } | |
4699 | ||
4700 | ret = -ENOSPC; | |
4701 | used = space_info->bytes_used + space_info->bytes_reserved + | |
4702 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4703 | space_info->bytes_may_use; | |
4704 | ||
4705 | /* | |
4706 | * The idea here is that we've not already over-reserved the block group | |
4707 | * then we can go ahead and save our reservation first and then start | |
4708 | * flushing if we need to. Otherwise if we've already overcommitted | |
4709 | * lets start flushing stuff first and then come back and try to make | |
4710 | * our reservation. | |
4711 | */ | |
4712 | if (used <= space_info->total_bytes) { | |
4713 | if (used + orig_bytes <= space_info->total_bytes) { | |
4714 | space_info->bytes_may_use += orig_bytes; | |
4715 | trace_btrfs_space_reservation(root->fs_info, | |
4716 | "space_info", space_info->flags, orig_bytes, 1); | |
4717 | ret = 0; | |
4718 | } else { | |
4719 | /* | |
4720 | * Ok set num_bytes to orig_bytes since we aren't | |
4721 | * overocmmitted, this way we only try and reclaim what | |
4722 | * we need. | |
4723 | */ | |
4724 | num_bytes = orig_bytes; | |
4725 | } | |
4726 | } else { | |
4727 | /* | |
4728 | * Ok we're over committed, set num_bytes to the overcommitted | |
4729 | * amount plus the amount of bytes that we need for this | |
4730 | * reservation. | |
4731 | */ | |
4732 | num_bytes = used - space_info->total_bytes + | |
4733 | (orig_bytes * 2); | |
4734 | } | |
4735 | ||
4736 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { | |
4737 | space_info->bytes_may_use += orig_bytes; | |
4738 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4739 | space_info->flags, orig_bytes, | |
4740 | 1); | |
4741 | ret = 0; | |
4742 | } | |
4743 | ||
4744 | /* | |
4745 | * Couldn't make our reservation, save our place so while we're trying | |
4746 | * to reclaim space we can actually use it instead of somebody else | |
4747 | * stealing it from us. | |
4748 | * | |
4749 | * We make the other tasks wait for the flush only when we can flush | |
4750 | * all things. | |
4751 | */ | |
4752 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { | |
4753 | flushing = true; | |
4754 | space_info->flush = 1; | |
4755 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
4756 | used += orig_bytes; | |
4757 | /* | |
4758 | * We will do the space reservation dance during log replay, | |
4759 | * which means we won't have fs_info->fs_root set, so don't do | |
4760 | * the async reclaim as we will panic. | |
4761 | */ | |
4762 | if (!root->fs_info->log_root_recovering && | |
4763 | need_do_async_reclaim(space_info, root->fs_info, used) && | |
4764 | !work_busy(&root->fs_info->async_reclaim_work)) | |
4765 | queue_work(system_unbound_wq, | |
4766 | &root->fs_info->async_reclaim_work); | |
4767 | } | |
4768 | spin_unlock(&space_info->lock); | |
4769 | ||
4770 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) | |
4771 | goto out; | |
4772 | ||
4773 | ret = flush_space(root, space_info, num_bytes, orig_bytes, | |
4774 | flush_state); | |
4775 | flush_state++; | |
4776 | ||
4777 | /* | |
4778 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4779 | * would happen. So skip delalloc flush. | |
4780 | */ | |
4781 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4782 | (flush_state == FLUSH_DELALLOC || | |
4783 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4784 | flush_state = ALLOC_CHUNK; | |
4785 | ||
4786 | if (!ret) | |
4787 | goto again; | |
4788 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4789 | flush_state < COMMIT_TRANS) | |
4790 | goto again; | |
4791 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4792 | flush_state <= COMMIT_TRANS) | |
4793 | goto again; | |
4794 | ||
4795 | out: | |
4796 | if (ret == -ENOSPC && | |
4797 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4798 | struct btrfs_block_rsv *global_rsv = | |
4799 | &root->fs_info->global_block_rsv; | |
4800 | ||
4801 | if (block_rsv != global_rsv && | |
4802 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4803 | ret = 0; | |
4804 | } | |
4805 | if (ret == -ENOSPC) | |
4806 | trace_btrfs_space_reservation(root->fs_info, | |
4807 | "space_info:enospc", | |
4808 | space_info->flags, orig_bytes, 1); | |
4809 | if (flushing) { | |
4810 | spin_lock(&space_info->lock); | |
4811 | space_info->flush = 0; | |
4812 | wake_up_all(&space_info->wait); | |
4813 | spin_unlock(&space_info->lock); | |
4814 | } | |
4815 | return ret; | |
4816 | } | |
4817 | ||
4818 | static struct btrfs_block_rsv *get_block_rsv( | |
4819 | const struct btrfs_trans_handle *trans, | |
4820 | const struct btrfs_root *root) | |
4821 | { | |
4822 | struct btrfs_block_rsv *block_rsv = NULL; | |
4823 | ||
4824 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4825 | block_rsv = trans->block_rsv; | |
4826 | ||
4827 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
4828 | block_rsv = trans->block_rsv; | |
4829 | ||
4830 | if (root == root->fs_info->uuid_root) | |
4831 | block_rsv = trans->block_rsv; | |
4832 | ||
4833 | if (!block_rsv) | |
4834 | block_rsv = root->block_rsv; | |
4835 | ||
4836 | if (!block_rsv) | |
4837 | block_rsv = &root->fs_info->empty_block_rsv; | |
4838 | ||
4839 | return block_rsv; | |
4840 | } | |
4841 | ||
4842 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4843 | u64 num_bytes) | |
4844 | { | |
4845 | int ret = -ENOSPC; | |
4846 | spin_lock(&block_rsv->lock); | |
4847 | if (block_rsv->reserved >= num_bytes) { | |
4848 | block_rsv->reserved -= num_bytes; | |
4849 | if (block_rsv->reserved < block_rsv->size) | |
4850 | block_rsv->full = 0; | |
4851 | ret = 0; | |
4852 | } | |
4853 | spin_unlock(&block_rsv->lock); | |
4854 | return ret; | |
4855 | } | |
4856 | ||
4857 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4858 | u64 num_bytes, int update_size) | |
4859 | { | |
4860 | spin_lock(&block_rsv->lock); | |
4861 | block_rsv->reserved += num_bytes; | |
4862 | if (update_size) | |
4863 | block_rsv->size += num_bytes; | |
4864 | else if (block_rsv->reserved >= block_rsv->size) | |
4865 | block_rsv->full = 1; | |
4866 | spin_unlock(&block_rsv->lock); | |
4867 | } | |
4868 | ||
4869 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, | |
4870 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
4871 | int min_factor) | |
4872 | { | |
4873 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
4874 | u64 min_bytes; | |
4875 | ||
4876 | if (global_rsv->space_info != dest->space_info) | |
4877 | return -ENOSPC; | |
4878 | ||
4879 | spin_lock(&global_rsv->lock); | |
4880 | min_bytes = div_factor(global_rsv->size, min_factor); | |
4881 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
4882 | spin_unlock(&global_rsv->lock); | |
4883 | return -ENOSPC; | |
4884 | } | |
4885 | global_rsv->reserved -= num_bytes; | |
4886 | if (global_rsv->reserved < global_rsv->size) | |
4887 | global_rsv->full = 0; | |
4888 | spin_unlock(&global_rsv->lock); | |
4889 | ||
4890 | block_rsv_add_bytes(dest, num_bytes, 1); | |
4891 | return 0; | |
4892 | } | |
4893 | ||
4894 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, | |
4895 | struct btrfs_block_rsv *block_rsv, | |
4896 | struct btrfs_block_rsv *dest, u64 num_bytes) | |
4897 | { | |
4898 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4899 | ||
4900 | spin_lock(&block_rsv->lock); | |
4901 | if (num_bytes == (u64)-1) | |
4902 | num_bytes = block_rsv->size; | |
4903 | block_rsv->size -= num_bytes; | |
4904 | if (block_rsv->reserved >= block_rsv->size) { | |
4905 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4906 | block_rsv->reserved = block_rsv->size; | |
4907 | block_rsv->full = 1; | |
4908 | } else { | |
4909 | num_bytes = 0; | |
4910 | } | |
4911 | spin_unlock(&block_rsv->lock); | |
4912 | ||
4913 | if (num_bytes > 0) { | |
4914 | if (dest) { | |
4915 | spin_lock(&dest->lock); | |
4916 | if (!dest->full) { | |
4917 | u64 bytes_to_add; | |
4918 | ||
4919 | bytes_to_add = dest->size - dest->reserved; | |
4920 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4921 | dest->reserved += bytes_to_add; | |
4922 | if (dest->reserved >= dest->size) | |
4923 | dest->full = 1; | |
4924 | num_bytes -= bytes_to_add; | |
4925 | } | |
4926 | spin_unlock(&dest->lock); | |
4927 | } | |
4928 | if (num_bytes) { | |
4929 | spin_lock(&space_info->lock); | |
4930 | space_info->bytes_may_use -= num_bytes; | |
4931 | trace_btrfs_space_reservation(fs_info, "space_info", | |
4932 | space_info->flags, num_bytes, 0); | |
4933 | spin_unlock(&space_info->lock); | |
4934 | } | |
4935 | } | |
4936 | } | |
4937 | ||
4938 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, | |
4939 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4940 | { | |
4941 | int ret; | |
4942 | ||
4943 | ret = block_rsv_use_bytes(src, num_bytes); | |
4944 | if (ret) | |
4945 | return ret; | |
4946 | ||
4947 | block_rsv_add_bytes(dst, num_bytes, 1); | |
4948 | return 0; | |
4949 | } | |
4950 | ||
4951 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) | |
4952 | { | |
4953 | memset(rsv, 0, sizeof(*rsv)); | |
4954 | spin_lock_init(&rsv->lock); | |
4955 | rsv->type = type; | |
4956 | } | |
4957 | ||
4958 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, | |
4959 | unsigned short type) | |
4960 | { | |
4961 | struct btrfs_block_rsv *block_rsv; | |
4962 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4963 | ||
4964 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); | |
4965 | if (!block_rsv) | |
4966 | return NULL; | |
4967 | ||
4968 | btrfs_init_block_rsv(block_rsv, type); | |
4969 | block_rsv->space_info = __find_space_info(fs_info, | |
4970 | BTRFS_BLOCK_GROUP_METADATA); | |
4971 | return block_rsv; | |
4972 | } | |
4973 | ||
4974 | void btrfs_free_block_rsv(struct btrfs_root *root, | |
4975 | struct btrfs_block_rsv *rsv) | |
4976 | { | |
4977 | if (!rsv) | |
4978 | return; | |
4979 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4980 | kfree(rsv); | |
4981 | } | |
4982 | ||
4983 | void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv) | |
4984 | { | |
4985 | kfree(rsv); | |
4986 | } | |
4987 | ||
4988 | int btrfs_block_rsv_add(struct btrfs_root *root, | |
4989 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4990 | enum btrfs_reserve_flush_enum flush) | |
4991 | { | |
4992 | int ret; | |
4993 | ||
4994 | if (num_bytes == 0) | |
4995 | return 0; | |
4996 | ||
4997 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); | |
4998 | if (!ret) { | |
4999 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
5000 | return 0; | |
5001 | } | |
5002 | ||
5003 | return ret; | |
5004 | } | |
5005 | ||
5006 | int btrfs_block_rsv_check(struct btrfs_root *root, | |
5007 | struct btrfs_block_rsv *block_rsv, int min_factor) | |
5008 | { | |
5009 | u64 num_bytes = 0; | |
5010 | int ret = -ENOSPC; | |
5011 | ||
5012 | if (!block_rsv) | |
5013 | return 0; | |
5014 | ||
5015 | spin_lock(&block_rsv->lock); | |
5016 | num_bytes = div_factor(block_rsv->size, min_factor); | |
5017 | if (block_rsv->reserved >= num_bytes) | |
5018 | ret = 0; | |
5019 | spin_unlock(&block_rsv->lock); | |
5020 | ||
5021 | return ret; | |
5022 | } | |
5023 | ||
5024 | int btrfs_block_rsv_refill(struct btrfs_root *root, | |
5025 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
5026 | enum btrfs_reserve_flush_enum flush) | |
5027 | { | |
5028 | u64 num_bytes = 0; | |
5029 | int ret = -ENOSPC; | |
5030 | ||
5031 | if (!block_rsv) | |
5032 | return 0; | |
5033 | ||
5034 | spin_lock(&block_rsv->lock); | |
5035 | num_bytes = min_reserved; | |
5036 | if (block_rsv->reserved >= num_bytes) | |
5037 | ret = 0; | |
5038 | else | |
5039 | num_bytes -= block_rsv->reserved; | |
5040 | spin_unlock(&block_rsv->lock); | |
5041 | ||
5042 | if (!ret) | |
5043 | return 0; | |
5044 | ||
5045 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); | |
5046 | if (!ret) { | |
5047 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
5048 | return 0; | |
5049 | } | |
5050 | ||
5051 | return ret; | |
5052 | } | |
5053 | ||
5054 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
5055 | struct btrfs_block_rsv *dst_rsv, | |
5056 | u64 num_bytes) | |
5057 | { | |
5058 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
5059 | } | |
5060 | ||
5061 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
5062 | struct btrfs_block_rsv *block_rsv, | |
5063 | u64 num_bytes) | |
5064 | { | |
5065 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
5066 | if (global_rsv == block_rsv || | |
5067 | block_rsv->space_info != global_rsv->space_info) | |
5068 | global_rsv = NULL; | |
5069 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, | |
5070 | num_bytes); | |
5071 | } | |
5072 | ||
5073 | /* | |
5074 | * helper to calculate size of global block reservation. | |
5075 | * the desired value is sum of space used by extent tree, | |
5076 | * checksum tree and root tree | |
5077 | */ | |
5078 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) | |
5079 | { | |
5080 | struct btrfs_space_info *sinfo; | |
5081 | u64 num_bytes; | |
5082 | u64 meta_used; | |
5083 | u64 data_used; | |
5084 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
5085 | ||
5086 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
5087 | spin_lock(&sinfo->lock); | |
5088 | data_used = sinfo->bytes_used; | |
5089 | spin_unlock(&sinfo->lock); | |
5090 | ||
5091 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
5092 | spin_lock(&sinfo->lock); | |
5093 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) | |
5094 | data_used = 0; | |
5095 | meta_used = sinfo->bytes_used; | |
5096 | spin_unlock(&sinfo->lock); | |
5097 | ||
5098 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * | |
5099 | csum_size * 2; | |
5100 | num_bytes += div_u64(data_used + meta_used, 50); | |
5101 | ||
5102 | if (num_bytes * 3 > meta_used) | |
5103 | num_bytes = div_u64(meta_used, 3); | |
5104 | ||
5105 | return ALIGN(num_bytes, fs_info->extent_root->nodesize << 10); | |
5106 | } | |
5107 | ||
5108 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) | |
5109 | { | |
5110 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
5111 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
5112 | u64 num_bytes; | |
5113 | ||
5114 | num_bytes = calc_global_metadata_size(fs_info); | |
5115 | ||
5116 | spin_lock(&sinfo->lock); | |
5117 | spin_lock(&block_rsv->lock); | |
5118 | ||
5119 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); | |
5120 | ||
5121 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + | |
5122 | sinfo->bytes_reserved + sinfo->bytes_readonly + | |
5123 | sinfo->bytes_may_use; | |
5124 | ||
5125 | if (sinfo->total_bytes > num_bytes) { | |
5126 | num_bytes = sinfo->total_bytes - num_bytes; | |
5127 | block_rsv->reserved += num_bytes; | |
5128 | sinfo->bytes_may_use += num_bytes; | |
5129 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5130 | sinfo->flags, num_bytes, 1); | |
5131 | } | |
5132 | ||
5133 | if (block_rsv->reserved >= block_rsv->size) { | |
5134 | num_bytes = block_rsv->reserved - block_rsv->size; | |
5135 | sinfo->bytes_may_use -= num_bytes; | |
5136 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5137 | sinfo->flags, num_bytes, 0); | |
5138 | block_rsv->reserved = block_rsv->size; | |
5139 | block_rsv->full = 1; | |
5140 | } | |
5141 | ||
5142 | spin_unlock(&block_rsv->lock); | |
5143 | spin_unlock(&sinfo->lock); | |
5144 | } | |
5145 | ||
5146 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) | |
5147 | { | |
5148 | struct btrfs_space_info *space_info; | |
5149 | ||
5150 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
5151 | fs_info->chunk_block_rsv.space_info = space_info; | |
5152 | ||
5153 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
5154 | fs_info->global_block_rsv.space_info = space_info; | |
5155 | fs_info->delalloc_block_rsv.space_info = space_info; | |
5156 | fs_info->trans_block_rsv.space_info = space_info; | |
5157 | fs_info->empty_block_rsv.space_info = space_info; | |
5158 | fs_info->delayed_block_rsv.space_info = space_info; | |
5159 | ||
5160 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; | |
5161 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
5162 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
5163 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
5164 | if (fs_info->quota_root) | |
5165 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
5166 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; | |
5167 | ||
5168 | update_global_block_rsv(fs_info); | |
5169 | } | |
5170 | ||
5171 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) | |
5172 | { | |
5173 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, | |
5174 | (u64)-1); | |
5175 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); | |
5176 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
5177 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
5178 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
5179 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
5180 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
5181 | WARN_ON(fs_info->delayed_block_rsv.size > 0); | |
5182 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
5183 | } | |
5184 | ||
5185 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, | |
5186 | struct btrfs_root *root) | |
5187 | { | |
5188 | if (!trans->block_rsv) | |
5189 | return; | |
5190 | ||
5191 | if (!trans->bytes_reserved) | |
5192 | return; | |
5193 | ||
5194 | trace_btrfs_space_reservation(root->fs_info, "transaction", | |
5195 | trans->transid, trans->bytes_reserved, 0); | |
5196 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); | |
5197 | trans->bytes_reserved = 0; | |
5198 | } | |
5199 | ||
5200 | /* | |
5201 | * To be called after all the new block groups attached to the transaction | |
5202 | * handle have been created (btrfs_create_pending_block_groups()). | |
5203 | */ | |
5204 | void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans) | |
5205 | { | |
5206 | struct btrfs_fs_info *fs_info = trans->root->fs_info; | |
5207 | ||
5208 | if (!trans->chunk_bytes_reserved) | |
5209 | return; | |
5210 | ||
5211 | WARN_ON_ONCE(!list_empty(&trans->new_bgs)); | |
5212 | ||
5213 | block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL, | |
5214 | trans->chunk_bytes_reserved); | |
5215 | trans->chunk_bytes_reserved = 0; | |
5216 | } | |
5217 | ||
5218 | /* Can only return 0 or -ENOSPC */ | |
5219 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, | |
5220 | struct inode *inode) | |
5221 | { | |
5222 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5223 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
5224 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
5225 | ||
5226 | /* | |
5227 | * We need to hold space in order to delete our orphan item once we've | |
5228 | * added it, so this takes the reservation so we can release it later | |
5229 | * when we are truly done with the orphan item. | |
5230 | */ | |
5231 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
5232 | trace_btrfs_space_reservation(root->fs_info, "orphan", | |
5233 | btrfs_ino(inode), num_bytes, 1); | |
5234 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
5235 | } | |
5236 | ||
5237 | void btrfs_orphan_release_metadata(struct inode *inode) | |
5238 | { | |
5239 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5240 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); | |
5241 | trace_btrfs_space_reservation(root->fs_info, "orphan", | |
5242 | btrfs_ino(inode), num_bytes, 0); | |
5243 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); | |
5244 | } | |
5245 | ||
5246 | /* | |
5247 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
5248 | * root: the root of the parent directory | |
5249 | * rsv: block reservation | |
5250 | * items: the number of items that we need do reservation | |
5251 | * qgroup_reserved: used to return the reserved size in qgroup | |
5252 | * | |
5253 | * This function is used to reserve the space for snapshot/subvolume | |
5254 | * creation and deletion. Those operations are different with the | |
5255 | * common file/directory operations, they change two fs/file trees | |
5256 | * and root tree, the number of items that the qgroup reserves is | |
5257 | * different with the free space reservation. So we can not use | |
5258 | * the space reseravtion mechanism in start_transaction(). | |
5259 | */ | |
5260 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
5261 | struct btrfs_block_rsv *rsv, | |
5262 | int items, | |
5263 | u64 *qgroup_reserved, | |
5264 | bool use_global_rsv) | |
5265 | { | |
5266 | u64 num_bytes; | |
5267 | int ret; | |
5268 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
5269 | ||
5270 | if (root->fs_info->quota_enabled) { | |
5271 | /* One for parent inode, two for dir entries */ | |
5272 | num_bytes = 3 * root->nodesize; | |
5273 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
5274 | if (ret) | |
5275 | return ret; | |
5276 | } else { | |
5277 | num_bytes = 0; | |
5278 | } | |
5279 | ||
5280 | *qgroup_reserved = num_bytes; | |
5281 | ||
5282 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
5283 | rsv->space_info = __find_space_info(root->fs_info, | |
5284 | BTRFS_BLOCK_GROUP_METADATA); | |
5285 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
5286 | BTRFS_RESERVE_FLUSH_ALL); | |
5287 | ||
5288 | if (ret == -ENOSPC && use_global_rsv) | |
5289 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes); | |
5290 | ||
5291 | if (ret) { | |
5292 | if (*qgroup_reserved) | |
5293 | btrfs_qgroup_free(root, *qgroup_reserved); | |
5294 | } | |
5295 | ||
5296 | return ret; | |
5297 | } | |
5298 | ||
5299 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
5300 | struct btrfs_block_rsv *rsv, | |
5301 | u64 qgroup_reserved) | |
5302 | { | |
5303 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
5304 | } | |
5305 | ||
5306 | /** | |
5307 | * drop_outstanding_extent - drop an outstanding extent | |
5308 | * @inode: the inode we're dropping the extent for | |
5309 | * @num_bytes: the number of bytes we're relaseing. | |
5310 | * | |
5311 | * This is called when we are freeing up an outstanding extent, either called | |
5312 | * after an error or after an extent is written. This will return the number of | |
5313 | * reserved extents that need to be freed. This must be called with | |
5314 | * BTRFS_I(inode)->lock held. | |
5315 | */ | |
5316 | static unsigned drop_outstanding_extent(struct inode *inode, u64 num_bytes) | |
5317 | { | |
5318 | unsigned drop_inode_space = 0; | |
5319 | unsigned dropped_extents = 0; | |
5320 | unsigned num_extents = 0; | |
5321 | ||
5322 | num_extents = (unsigned)div64_u64(num_bytes + | |
5323 | BTRFS_MAX_EXTENT_SIZE - 1, | |
5324 | BTRFS_MAX_EXTENT_SIZE); | |
5325 | ASSERT(num_extents); | |
5326 | ASSERT(BTRFS_I(inode)->outstanding_extents >= num_extents); | |
5327 | BTRFS_I(inode)->outstanding_extents -= num_extents; | |
5328 | ||
5329 | if (BTRFS_I(inode)->outstanding_extents == 0 && | |
5330 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, | |
5331 | &BTRFS_I(inode)->runtime_flags)) | |
5332 | drop_inode_space = 1; | |
5333 | ||
5334 | /* | |
5335 | * If we have more or the same amount of outsanding extents than we have | |
5336 | * reserved then we need to leave the reserved extents count alone. | |
5337 | */ | |
5338 | if (BTRFS_I(inode)->outstanding_extents >= | |
5339 | BTRFS_I(inode)->reserved_extents) | |
5340 | return drop_inode_space; | |
5341 | ||
5342 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
5343 | BTRFS_I(inode)->outstanding_extents; | |
5344 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
5345 | return dropped_extents + drop_inode_space; | |
5346 | } | |
5347 | ||
5348 | /** | |
5349 | * calc_csum_metadata_size - return the amount of metada space that must be | |
5350 | * reserved/free'd for the given bytes. | |
5351 | * @inode: the inode we're manipulating | |
5352 | * @num_bytes: the number of bytes in question | |
5353 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
5354 | * | |
5355 | * This adjusts the number of csum_bytes in the inode and then returns the | |
5356 | * correct amount of metadata that must either be reserved or freed. We | |
5357 | * calculate how many checksums we can fit into one leaf and then divide the | |
5358 | * number of bytes that will need to be checksumed by this value to figure out | |
5359 | * how many checksums will be required. If we are adding bytes then the number | |
5360 | * may go up and we will return the number of additional bytes that must be | |
5361 | * reserved. If it is going down we will return the number of bytes that must | |
5362 | * be freed. | |
5363 | * | |
5364 | * This must be called with BTRFS_I(inode)->lock held. | |
5365 | */ | |
5366 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
5367 | int reserve) | |
5368 | { | |
5369 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5370 | u64 old_csums, num_csums; | |
5371 | ||
5372 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
5373 | BTRFS_I(inode)->csum_bytes == 0) | |
5374 | return 0; | |
5375 | ||
5376 | old_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); | |
5377 | if (reserve) | |
5378 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
5379 | else | |
5380 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
5381 | num_csums = btrfs_csum_bytes_to_leaves(root, BTRFS_I(inode)->csum_bytes); | |
5382 | ||
5383 | /* No change, no need to reserve more */ | |
5384 | if (old_csums == num_csums) | |
5385 | return 0; | |
5386 | ||
5387 | if (reserve) | |
5388 | return btrfs_calc_trans_metadata_size(root, | |
5389 | num_csums - old_csums); | |
5390 | ||
5391 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
5392 | } | |
5393 | ||
5394 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) | |
5395 | { | |
5396 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5397 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
5398 | u64 to_reserve = 0; | |
5399 | u64 csum_bytes; | |
5400 | unsigned nr_extents = 0; | |
5401 | int extra_reserve = 0; | |
5402 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; | |
5403 | int ret = 0; | |
5404 | bool delalloc_lock = true; | |
5405 | u64 to_free = 0; | |
5406 | unsigned dropped; | |
5407 | ||
5408 | /* If we are a free space inode we need to not flush since we will be in | |
5409 | * the middle of a transaction commit. We also don't need the delalloc | |
5410 | * mutex since we won't race with anybody. We need this mostly to make | |
5411 | * lockdep shut its filthy mouth. | |
5412 | */ | |
5413 | if (btrfs_is_free_space_inode(inode)) { | |
5414 | flush = BTRFS_RESERVE_NO_FLUSH; | |
5415 | delalloc_lock = false; | |
5416 | } | |
5417 | ||
5418 | if (flush != BTRFS_RESERVE_NO_FLUSH && | |
5419 | btrfs_transaction_in_commit(root->fs_info)) | |
5420 | schedule_timeout(1); | |
5421 | ||
5422 | if (delalloc_lock) | |
5423 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
5424 | ||
5425 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
5426 | ||
5427 | spin_lock(&BTRFS_I(inode)->lock); | |
5428 | nr_extents = (unsigned)div64_u64(num_bytes + | |
5429 | BTRFS_MAX_EXTENT_SIZE - 1, | |
5430 | BTRFS_MAX_EXTENT_SIZE); | |
5431 | BTRFS_I(inode)->outstanding_extents += nr_extents; | |
5432 | nr_extents = 0; | |
5433 | ||
5434 | if (BTRFS_I(inode)->outstanding_extents > | |
5435 | BTRFS_I(inode)->reserved_extents) | |
5436 | nr_extents = BTRFS_I(inode)->outstanding_extents - | |
5437 | BTRFS_I(inode)->reserved_extents; | |
5438 | ||
5439 | /* | |
5440 | * Add an item to reserve for updating the inode when we complete the | |
5441 | * delalloc io. | |
5442 | */ | |
5443 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, | |
5444 | &BTRFS_I(inode)->runtime_flags)) { | |
5445 | nr_extents++; | |
5446 | extra_reserve = 1; | |
5447 | } | |
5448 | ||
5449 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
5450 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); | |
5451 | csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5452 | spin_unlock(&BTRFS_I(inode)->lock); | |
5453 | ||
5454 | if (root->fs_info->quota_enabled) { | |
5455 | ret = btrfs_qgroup_reserve(root, nr_extents * root->nodesize); | |
5456 | if (ret) | |
5457 | goto out_fail; | |
5458 | } | |
5459 | ||
5460 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); | |
5461 | if (unlikely(ret)) { | |
5462 | if (root->fs_info->quota_enabled) | |
5463 | btrfs_qgroup_free(root, nr_extents * root->nodesize); | |
5464 | goto out_fail; | |
5465 | } | |
5466 | ||
5467 | spin_lock(&BTRFS_I(inode)->lock); | |
5468 | if (extra_reserve) { | |
5469 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, | |
5470 | &BTRFS_I(inode)->runtime_flags); | |
5471 | nr_extents--; | |
5472 | } | |
5473 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
5474 | spin_unlock(&BTRFS_I(inode)->lock); | |
5475 | ||
5476 | if (delalloc_lock) | |
5477 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5478 | ||
5479 | if (to_reserve) | |
5480 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5481 | btrfs_ino(inode), to_reserve, 1); | |
5482 | block_rsv_add_bytes(block_rsv, to_reserve, 1); | |
5483 | ||
5484 | return 0; | |
5485 | ||
5486 | out_fail: | |
5487 | spin_lock(&BTRFS_I(inode)->lock); | |
5488 | dropped = drop_outstanding_extent(inode, num_bytes); | |
5489 | /* | |
5490 | * If the inodes csum_bytes is the same as the original | |
5491 | * csum_bytes then we know we haven't raced with any free()ers | |
5492 | * so we can just reduce our inodes csum bytes and carry on. | |
5493 | */ | |
5494 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { | |
5495 | calc_csum_metadata_size(inode, num_bytes, 0); | |
5496 | } else { | |
5497 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
5498 | u64 bytes; | |
5499 | ||
5500 | /* | |
5501 | * This is tricky, but first we need to figure out how much we | |
5502 | * free'd from any free-ers that occured during this | |
5503 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
5504 | * before we dropped our lock, and then call the free for the | |
5505 | * number of bytes that were freed while we were trying our | |
5506 | * reservation. | |
5507 | */ | |
5508 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
5509 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
5510 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
5511 | ||
5512 | ||
5513 | /* | |
5514 | * Now we need to see how much we would have freed had we not | |
5515 | * been making this reservation and our ->csum_bytes were not | |
5516 | * artificially inflated. | |
5517 | */ | |
5518 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
5519 | bytes = csum_bytes - orig_csum_bytes; | |
5520 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
5521 | ||
5522 | /* | |
5523 | * Now reset ->csum_bytes to what it should be. If bytes is | |
5524 | * more than to_free then we would have free'd more space had we | |
5525 | * not had an artificially high ->csum_bytes, so we need to free | |
5526 | * the remainder. If bytes is the same or less then we don't | |
5527 | * need to do anything, the other free-ers did the correct | |
5528 | * thing. | |
5529 | */ | |
5530 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
5531 | if (bytes > to_free) | |
5532 | to_free = bytes - to_free; | |
5533 | else | |
5534 | to_free = 0; | |
5535 | } | |
5536 | spin_unlock(&BTRFS_I(inode)->lock); | |
5537 | if (dropped) | |
5538 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5539 | ||
5540 | if (to_free) { | |
5541 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
5542 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5543 | btrfs_ino(inode), to_free, 0); | |
5544 | } | |
5545 | if (delalloc_lock) | |
5546 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
5547 | return ret; | |
5548 | } | |
5549 | ||
5550 | /** | |
5551 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
5552 | * @inode: the inode to release the reservation for | |
5553 | * @num_bytes: the number of bytes we're releasing | |
5554 | * | |
5555 | * This will release the metadata reservation for an inode. This can be called | |
5556 | * once we complete IO for a given set of bytes to release their metadata | |
5557 | * reservations. | |
5558 | */ | |
5559 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) | |
5560 | { | |
5561 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5562 | u64 to_free = 0; | |
5563 | unsigned dropped; | |
5564 | ||
5565 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
5566 | spin_lock(&BTRFS_I(inode)->lock); | |
5567 | dropped = drop_outstanding_extent(inode, num_bytes); | |
5568 | ||
5569 | if (num_bytes) | |
5570 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
5571 | spin_unlock(&BTRFS_I(inode)->lock); | |
5572 | if (dropped > 0) | |
5573 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
5574 | ||
5575 | if (btrfs_test_is_dummy_root(root)) | |
5576 | return; | |
5577 | ||
5578 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5579 | btrfs_ino(inode), to_free, 0); | |
5580 | ||
5581 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, | |
5582 | to_free); | |
5583 | } | |
5584 | ||
5585 | /** | |
5586 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
5587 | * @inode: inode we're writing to | |
5588 | * @num_bytes: the number of bytes we want to allocate | |
5589 | * | |
5590 | * This will do the following things | |
5591 | * | |
5592 | * o reserve space in the data space info for num_bytes | |
5593 | * o reserve space in the metadata space info based on number of outstanding | |
5594 | * extents and how much csums will be needed | |
5595 | * o add to the inodes ->delalloc_bytes | |
5596 | * o add it to the fs_info's delalloc inodes list. | |
5597 | * | |
5598 | * This will return 0 for success and -ENOSPC if there is no space left. | |
5599 | */ | |
5600 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) | |
5601 | { | |
5602 | int ret; | |
5603 | ||
5604 | ret = btrfs_check_data_free_space(inode, num_bytes, num_bytes); | |
5605 | if (ret) | |
5606 | return ret; | |
5607 | ||
5608 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
5609 | if (ret) { | |
5610 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5611 | return ret; | |
5612 | } | |
5613 | ||
5614 | return 0; | |
5615 | } | |
5616 | ||
5617 | /** | |
5618 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
5619 | * @inode: inode we're releasing space for | |
5620 | * @num_bytes: the number of bytes we want to free up | |
5621 | * | |
5622 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
5623 | * called in the case that we don't need the metadata AND data reservations | |
5624 | * anymore. So if there is an error or we insert an inline extent. | |
5625 | * | |
5626 | * This function will release the metadata space that was not used and will | |
5627 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
5628 | * list if there are no delalloc bytes left. | |
5629 | */ | |
5630 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) | |
5631 | { | |
5632 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
5633 | btrfs_free_reserved_data_space(inode, num_bytes); | |
5634 | } | |
5635 | ||
5636 | static int update_block_group(struct btrfs_trans_handle *trans, | |
5637 | struct btrfs_root *root, u64 bytenr, | |
5638 | u64 num_bytes, int alloc) | |
5639 | { | |
5640 | struct btrfs_block_group_cache *cache = NULL; | |
5641 | struct btrfs_fs_info *info = root->fs_info; | |
5642 | u64 total = num_bytes; | |
5643 | u64 old_val; | |
5644 | u64 byte_in_group; | |
5645 | int factor; | |
5646 | ||
5647 | /* block accounting for super block */ | |
5648 | spin_lock(&info->delalloc_root_lock); | |
5649 | old_val = btrfs_super_bytes_used(info->super_copy); | |
5650 | if (alloc) | |
5651 | old_val += num_bytes; | |
5652 | else | |
5653 | old_val -= num_bytes; | |
5654 | btrfs_set_super_bytes_used(info->super_copy, old_val); | |
5655 | spin_unlock(&info->delalloc_root_lock); | |
5656 | ||
5657 | while (total) { | |
5658 | cache = btrfs_lookup_block_group(info, bytenr); | |
5659 | if (!cache) | |
5660 | return -ENOENT; | |
5661 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | | |
5662 | BTRFS_BLOCK_GROUP_RAID1 | | |
5663 | BTRFS_BLOCK_GROUP_RAID10)) | |
5664 | factor = 2; | |
5665 | else | |
5666 | factor = 1; | |
5667 | /* | |
5668 | * If this block group has free space cache written out, we | |
5669 | * need to make sure to load it if we are removing space. This | |
5670 | * is because we need the unpinning stage to actually add the | |
5671 | * space back to the block group, otherwise we will leak space. | |
5672 | */ | |
5673 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
5674 | cache_block_group(cache, 1); | |
5675 | ||
5676 | byte_in_group = bytenr - cache->key.objectid; | |
5677 | WARN_ON(byte_in_group > cache->key.offset); | |
5678 | ||
5679 | spin_lock(&cache->space_info->lock); | |
5680 | spin_lock(&cache->lock); | |
5681 | ||
5682 | if (btrfs_test_opt(root, SPACE_CACHE) && | |
5683 | cache->disk_cache_state < BTRFS_DC_CLEAR) | |
5684 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
5685 | ||
5686 | old_val = btrfs_block_group_used(&cache->item); | |
5687 | num_bytes = min(total, cache->key.offset - byte_in_group); | |
5688 | if (alloc) { | |
5689 | old_val += num_bytes; | |
5690 | btrfs_set_block_group_used(&cache->item, old_val); | |
5691 | cache->reserved -= num_bytes; | |
5692 | cache->space_info->bytes_reserved -= num_bytes; | |
5693 | cache->space_info->bytes_used += num_bytes; | |
5694 | cache->space_info->disk_used += num_bytes * factor; | |
5695 | spin_unlock(&cache->lock); | |
5696 | spin_unlock(&cache->space_info->lock); | |
5697 | } else { | |
5698 | old_val -= num_bytes; | |
5699 | btrfs_set_block_group_used(&cache->item, old_val); | |
5700 | cache->pinned += num_bytes; | |
5701 | cache->space_info->bytes_pinned += num_bytes; | |
5702 | cache->space_info->bytes_used -= num_bytes; | |
5703 | cache->space_info->disk_used -= num_bytes * factor; | |
5704 | spin_unlock(&cache->lock); | |
5705 | spin_unlock(&cache->space_info->lock); | |
5706 | ||
5707 | set_extent_dirty(info->pinned_extents, | |
5708 | bytenr, bytenr + num_bytes - 1, | |
5709 | GFP_NOFS | __GFP_NOFAIL); | |
5710 | /* | |
5711 | * No longer have used bytes in this block group, queue | |
5712 | * it for deletion. | |
5713 | */ | |
5714 | if (old_val == 0) { | |
5715 | spin_lock(&info->unused_bgs_lock); | |
5716 | if (list_empty(&cache->bg_list)) { | |
5717 | btrfs_get_block_group(cache); | |
5718 | list_add_tail(&cache->bg_list, | |
5719 | &info->unused_bgs); | |
5720 | } | |
5721 | spin_unlock(&info->unused_bgs_lock); | |
5722 | } | |
5723 | } | |
5724 | ||
5725 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
5726 | if (list_empty(&cache->dirty_list)) { | |
5727 | list_add_tail(&cache->dirty_list, | |
5728 | &trans->transaction->dirty_bgs); | |
5729 | trans->transaction->num_dirty_bgs++; | |
5730 | btrfs_get_block_group(cache); | |
5731 | } | |
5732 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
5733 | ||
5734 | btrfs_put_block_group(cache); | |
5735 | total -= num_bytes; | |
5736 | bytenr += num_bytes; | |
5737 | } | |
5738 | return 0; | |
5739 | } | |
5740 | ||
5741 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) | |
5742 | { | |
5743 | struct btrfs_block_group_cache *cache; | |
5744 | u64 bytenr; | |
5745 | ||
5746 | spin_lock(&root->fs_info->block_group_cache_lock); | |
5747 | bytenr = root->fs_info->first_logical_byte; | |
5748 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5749 | ||
5750 | if (bytenr < (u64)-1) | |
5751 | return bytenr; | |
5752 | ||
5753 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); | |
5754 | if (!cache) | |
5755 | return 0; | |
5756 | ||
5757 | bytenr = cache->key.objectid; | |
5758 | btrfs_put_block_group(cache); | |
5759 | ||
5760 | return bytenr; | |
5761 | } | |
5762 | ||
5763 | static int pin_down_extent(struct btrfs_root *root, | |
5764 | struct btrfs_block_group_cache *cache, | |
5765 | u64 bytenr, u64 num_bytes, int reserved) | |
5766 | { | |
5767 | spin_lock(&cache->space_info->lock); | |
5768 | spin_lock(&cache->lock); | |
5769 | cache->pinned += num_bytes; | |
5770 | cache->space_info->bytes_pinned += num_bytes; | |
5771 | if (reserved) { | |
5772 | cache->reserved -= num_bytes; | |
5773 | cache->space_info->bytes_reserved -= num_bytes; | |
5774 | } | |
5775 | spin_unlock(&cache->lock); | |
5776 | spin_unlock(&cache->space_info->lock); | |
5777 | ||
5778 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, | |
5779 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
5780 | if (reserved) | |
5781 | trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); | |
5782 | return 0; | |
5783 | } | |
5784 | ||
5785 | /* | |
5786 | * this function must be called within transaction | |
5787 | */ | |
5788 | int btrfs_pin_extent(struct btrfs_root *root, | |
5789 | u64 bytenr, u64 num_bytes, int reserved) | |
5790 | { | |
5791 | struct btrfs_block_group_cache *cache; | |
5792 | ||
5793 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
5794 | BUG_ON(!cache); /* Logic error */ | |
5795 | ||
5796 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5797 | ||
5798 | btrfs_put_block_group(cache); | |
5799 | return 0; | |
5800 | } | |
5801 | ||
5802 | /* | |
5803 | * this function must be called within transaction | |
5804 | */ | |
5805 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, | |
5806 | u64 bytenr, u64 num_bytes) | |
5807 | { | |
5808 | struct btrfs_block_group_cache *cache; | |
5809 | int ret; | |
5810 | ||
5811 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
5812 | if (!cache) | |
5813 | return -EINVAL; | |
5814 | ||
5815 | /* | |
5816 | * pull in the free space cache (if any) so that our pin | |
5817 | * removes the free space from the cache. We have load_only set | |
5818 | * to one because the slow code to read in the free extents does check | |
5819 | * the pinned extents. | |
5820 | */ | |
5821 | cache_block_group(cache, 1); | |
5822 | ||
5823 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5824 | ||
5825 | /* remove us from the free space cache (if we're there at all) */ | |
5826 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); | |
5827 | btrfs_put_block_group(cache); | |
5828 | return ret; | |
5829 | } | |
5830 | ||
5831 | static int __exclude_logged_extent(struct btrfs_root *root, u64 start, u64 num_bytes) | |
5832 | { | |
5833 | int ret; | |
5834 | struct btrfs_block_group_cache *block_group; | |
5835 | struct btrfs_caching_control *caching_ctl; | |
5836 | ||
5837 | block_group = btrfs_lookup_block_group(root->fs_info, start); | |
5838 | if (!block_group) | |
5839 | return -EINVAL; | |
5840 | ||
5841 | cache_block_group(block_group, 0); | |
5842 | caching_ctl = get_caching_control(block_group); | |
5843 | ||
5844 | if (!caching_ctl) { | |
5845 | /* Logic error */ | |
5846 | BUG_ON(!block_group_cache_done(block_group)); | |
5847 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
5848 | } else { | |
5849 | mutex_lock(&caching_ctl->mutex); | |
5850 | ||
5851 | if (start >= caching_ctl->progress) { | |
5852 | ret = add_excluded_extent(root, start, num_bytes); | |
5853 | } else if (start + num_bytes <= caching_ctl->progress) { | |
5854 | ret = btrfs_remove_free_space(block_group, | |
5855 | start, num_bytes); | |
5856 | } else { | |
5857 | num_bytes = caching_ctl->progress - start; | |
5858 | ret = btrfs_remove_free_space(block_group, | |
5859 | start, num_bytes); | |
5860 | if (ret) | |
5861 | goto out_lock; | |
5862 | ||
5863 | num_bytes = (start + num_bytes) - | |
5864 | caching_ctl->progress; | |
5865 | start = caching_ctl->progress; | |
5866 | ret = add_excluded_extent(root, start, num_bytes); | |
5867 | } | |
5868 | out_lock: | |
5869 | mutex_unlock(&caching_ctl->mutex); | |
5870 | put_caching_control(caching_ctl); | |
5871 | } | |
5872 | btrfs_put_block_group(block_group); | |
5873 | return ret; | |
5874 | } | |
5875 | ||
5876 | int btrfs_exclude_logged_extents(struct btrfs_root *log, | |
5877 | struct extent_buffer *eb) | |
5878 | { | |
5879 | struct btrfs_file_extent_item *item; | |
5880 | struct btrfs_key key; | |
5881 | int found_type; | |
5882 | int i; | |
5883 | ||
5884 | if (!btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) | |
5885 | return 0; | |
5886 | ||
5887 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
5888 | btrfs_item_key_to_cpu(eb, &key, i); | |
5889 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
5890 | continue; | |
5891 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
5892 | found_type = btrfs_file_extent_type(eb, item); | |
5893 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
5894 | continue; | |
5895 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
5896 | continue; | |
5897 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
5898 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
5899 | __exclude_logged_extent(log, key.objectid, key.offset); | |
5900 | } | |
5901 | ||
5902 | return 0; | |
5903 | } | |
5904 | ||
5905 | /** | |
5906 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5907 | * @cache: The cache we are manipulating | |
5908 | * @num_bytes: The number of bytes in question | |
5909 | * @reserve: One of the reservation enums | |
5910 | * @delalloc: The blocks are allocated for the delalloc write | |
5911 | * | |
5912 | * This is called by the allocator when it reserves space, or by somebody who is | |
5913 | * freeing space that was never actually used on disk. For example if you | |
5914 | * reserve some space for a new leaf in transaction A and before transaction A | |
5915 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5916 | * clear the reservation. | |
5917 | * | |
5918 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5919 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5920 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5921 | * allocating less disk space for the amount of data we have reserved in the | |
5922 | * case of compression. | |
5923 | * | |
5924 | * If this is a reservation and the block group has become read only we cannot | |
5925 | * make the reservation and return -EAGAIN, otherwise this function always | |
5926 | * succeeds. | |
5927 | */ | |
5928 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, | |
5929 | u64 num_bytes, int reserve, int delalloc) | |
5930 | { | |
5931 | struct btrfs_space_info *space_info = cache->space_info; | |
5932 | int ret = 0; | |
5933 | ||
5934 | spin_lock(&space_info->lock); | |
5935 | spin_lock(&cache->lock); | |
5936 | if (reserve != RESERVE_FREE) { | |
5937 | if (cache->ro) { | |
5938 | ret = -EAGAIN; | |
5939 | } else { | |
5940 | cache->reserved += num_bytes; | |
5941 | space_info->bytes_reserved += num_bytes; | |
5942 | if (reserve == RESERVE_ALLOC) { | |
5943 | trace_btrfs_space_reservation(cache->fs_info, | |
5944 | "space_info", space_info->flags, | |
5945 | num_bytes, 0); | |
5946 | space_info->bytes_may_use -= num_bytes; | |
5947 | } | |
5948 | ||
5949 | if (delalloc) | |
5950 | cache->delalloc_bytes += num_bytes; | |
5951 | } | |
5952 | } else { | |
5953 | if (cache->ro) | |
5954 | space_info->bytes_readonly += num_bytes; | |
5955 | cache->reserved -= num_bytes; | |
5956 | space_info->bytes_reserved -= num_bytes; | |
5957 | ||
5958 | if (delalloc) | |
5959 | cache->delalloc_bytes -= num_bytes; | |
5960 | } | |
5961 | spin_unlock(&cache->lock); | |
5962 | spin_unlock(&space_info->lock); | |
5963 | return ret; | |
5964 | } | |
5965 | ||
5966 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, | |
5967 | struct btrfs_root *root) | |
5968 | { | |
5969 | struct btrfs_fs_info *fs_info = root->fs_info; | |
5970 | struct btrfs_caching_control *next; | |
5971 | struct btrfs_caching_control *caching_ctl; | |
5972 | struct btrfs_block_group_cache *cache; | |
5973 | ||
5974 | down_write(&fs_info->commit_root_sem); | |
5975 | ||
5976 | list_for_each_entry_safe(caching_ctl, next, | |
5977 | &fs_info->caching_block_groups, list) { | |
5978 | cache = caching_ctl->block_group; | |
5979 | if (block_group_cache_done(cache)) { | |
5980 | cache->last_byte_to_unpin = (u64)-1; | |
5981 | list_del_init(&caching_ctl->list); | |
5982 | put_caching_control(caching_ctl); | |
5983 | } else { | |
5984 | cache->last_byte_to_unpin = caching_ctl->progress; | |
5985 | } | |
5986 | } | |
5987 | ||
5988 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5989 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5990 | else | |
5991 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5992 | ||
5993 | up_write(&fs_info->commit_root_sem); | |
5994 | ||
5995 | update_global_block_rsv(fs_info); | |
5996 | } | |
5997 | ||
5998 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end, | |
5999 | const bool return_free_space) | |
6000 | { | |
6001 | struct btrfs_fs_info *fs_info = root->fs_info; | |
6002 | struct btrfs_block_group_cache *cache = NULL; | |
6003 | struct btrfs_space_info *space_info; | |
6004 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
6005 | u64 len; | |
6006 | bool readonly; | |
6007 | ||
6008 | while (start <= end) { | |
6009 | readonly = false; | |
6010 | if (!cache || | |
6011 | start >= cache->key.objectid + cache->key.offset) { | |
6012 | if (cache) | |
6013 | btrfs_put_block_group(cache); | |
6014 | cache = btrfs_lookup_block_group(fs_info, start); | |
6015 | BUG_ON(!cache); /* Logic error */ | |
6016 | } | |
6017 | ||
6018 | len = cache->key.objectid + cache->key.offset - start; | |
6019 | len = min(len, end + 1 - start); | |
6020 | ||
6021 | if (start < cache->last_byte_to_unpin) { | |
6022 | len = min(len, cache->last_byte_to_unpin - start); | |
6023 | if (return_free_space) | |
6024 | btrfs_add_free_space(cache, start, len); | |
6025 | } | |
6026 | ||
6027 | start += len; | |
6028 | space_info = cache->space_info; | |
6029 | ||
6030 | spin_lock(&space_info->lock); | |
6031 | spin_lock(&cache->lock); | |
6032 | cache->pinned -= len; | |
6033 | space_info->bytes_pinned -= len; | |
6034 | percpu_counter_add(&space_info->total_bytes_pinned, -len); | |
6035 | if (cache->ro) { | |
6036 | space_info->bytes_readonly += len; | |
6037 | readonly = true; | |
6038 | } | |
6039 | spin_unlock(&cache->lock); | |
6040 | if (!readonly && global_rsv->space_info == space_info) { | |
6041 | spin_lock(&global_rsv->lock); | |
6042 | if (!global_rsv->full) { | |
6043 | len = min(len, global_rsv->size - | |
6044 | global_rsv->reserved); | |
6045 | global_rsv->reserved += len; | |
6046 | space_info->bytes_may_use += len; | |
6047 | if (global_rsv->reserved >= global_rsv->size) | |
6048 | global_rsv->full = 1; | |
6049 | } | |
6050 | spin_unlock(&global_rsv->lock); | |
6051 | } | |
6052 | spin_unlock(&space_info->lock); | |
6053 | } | |
6054 | ||
6055 | if (cache) | |
6056 | btrfs_put_block_group(cache); | |
6057 | return 0; | |
6058 | } | |
6059 | ||
6060 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
6061 | struct btrfs_root *root) | |
6062 | { | |
6063 | struct btrfs_fs_info *fs_info = root->fs_info; | |
6064 | struct extent_io_tree *unpin; | |
6065 | u64 start; | |
6066 | u64 end; | |
6067 | int ret; | |
6068 | ||
6069 | if (trans->aborted) | |
6070 | return 0; | |
6071 | ||
6072 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
6073 | unpin = &fs_info->freed_extents[1]; | |
6074 | else | |
6075 | unpin = &fs_info->freed_extents[0]; | |
6076 | ||
6077 | while (1) { | |
6078 | mutex_lock(&fs_info->unused_bg_unpin_mutex); | |
6079 | ret = find_first_extent_bit(unpin, 0, &start, &end, | |
6080 | EXTENT_DIRTY, NULL); | |
6081 | if (ret) { | |
6082 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
6083 | break; | |
6084 | } | |
6085 | ||
6086 | if (btrfs_test_opt(root, DISCARD)) | |
6087 | ret = btrfs_discard_extent(root, start, | |
6088 | end + 1 - start, NULL); | |
6089 | ||
6090 | clear_extent_dirty(unpin, start, end, GFP_NOFS); | |
6091 | unpin_extent_range(root, start, end, true); | |
6092 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
6093 | cond_resched(); | |
6094 | } | |
6095 | ||
6096 | return 0; | |
6097 | } | |
6098 | ||
6099 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes, | |
6100 | u64 owner, u64 root_objectid) | |
6101 | { | |
6102 | struct btrfs_space_info *space_info; | |
6103 | u64 flags; | |
6104 | ||
6105 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
6106 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
6107 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
6108 | else | |
6109 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
6110 | } else { | |
6111 | flags = BTRFS_BLOCK_GROUP_DATA; | |
6112 | } | |
6113 | ||
6114 | space_info = __find_space_info(fs_info, flags); | |
6115 | BUG_ON(!space_info); /* Logic bug */ | |
6116 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); | |
6117 | } | |
6118 | ||
6119 | ||
6120 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, | |
6121 | struct btrfs_root *root, | |
6122 | u64 bytenr, u64 num_bytes, u64 parent, | |
6123 | u64 root_objectid, u64 owner_objectid, | |
6124 | u64 owner_offset, int refs_to_drop, | |
6125 | struct btrfs_delayed_extent_op *extent_op, | |
6126 | int no_quota) | |
6127 | { | |
6128 | struct btrfs_key key; | |
6129 | struct btrfs_path *path; | |
6130 | struct btrfs_fs_info *info = root->fs_info; | |
6131 | struct btrfs_root *extent_root = info->extent_root; | |
6132 | struct extent_buffer *leaf; | |
6133 | struct btrfs_extent_item *ei; | |
6134 | struct btrfs_extent_inline_ref *iref; | |
6135 | int ret; | |
6136 | int is_data; | |
6137 | int extent_slot = 0; | |
6138 | int found_extent = 0; | |
6139 | int num_to_del = 1; | |
6140 | u32 item_size; | |
6141 | u64 refs; | |
6142 | int last_ref = 0; | |
6143 | enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_SUB_EXCL; | |
6144 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
6145 | SKINNY_METADATA); | |
6146 | ||
6147 | if (!info->quota_enabled || !is_fstree(root_objectid)) | |
6148 | no_quota = 1; | |
6149 | ||
6150 | path = btrfs_alloc_path(); | |
6151 | if (!path) | |
6152 | return -ENOMEM; | |
6153 | ||
6154 | path->reada = 1; | |
6155 | path->leave_spinning = 1; | |
6156 | ||
6157 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
6158 | BUG_ON(!is_data && refs_to_drop != 1); | |
6159 | ||
6160 | if (is_data) | |
6161 | skinny_metadata = 0; | |
6162 | ||
6163 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
6164 | bytenr, num_bytes, parent, | |
6165 | root_objectid, owner_objectid, | |
6166 | owner_offset); | |
6167 | if (ret == 0) { | |
6168 | extent_slot = path->slots[0]; | |
6169 | while (extent_slot >= 0) { | |
6170 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
6171 | extent_slot); | |
6172 | if (key.objectid != bytenr) | |
6173 | break; | |
6174 | if (key.type == BTRFS_EXTENT_ITEM_KEY && | |
6175 | key.offset == num_bytes) { | |
6176 | found_extent = 1; | |
6177 | break; | |
6178 | } | |
6179 | if (key.type == BTRFS_METADATA_ITEM_KEY && | |
6180 | key.offset == owner_objectid) { | |
6181 | found_extent = 1; | |
6182 | break; | |
6183 | } | |
6184 | if (path->slots[0] - extent_slot > 5) | |
6185 | break; | |
6186 | extent_slot--; | |
6187 | } | |
6188 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
6189 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
6190 | if (found_extent && item_size < sizeof(*ei)) | |
6191 | found_extent = 0; | |
6192 | #endif | |
6193 | if (!found_extent) { | |
6194 | BUG_ON(iref); | |
6195 | ret = remove_extent_backref(trans, extent_root, path, | |
6196 | NULL, refs_to_drop, | |
6197 | is_data, &last_ref); | |
6198 | if (ret) { | |
6199 | btrfs_abort_transaction(trans, extent_root, ret); | |
6200 | goto out; | |
6201 | } | |
6202 | btrfs_release_path(path); | |
6203 | path->leave_spinning = 1; | |
6204 | ||
6205 | key.objectid = bytenr; | |
6206 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6207 | key.offset = num_bytes; | |
6208 | ||
6209 | if (!is_data && skinny_metadata) { | |
6210 | key.type = BTRFS_METADATA_ITEM_KEY; | |
6211 | key.offset = owner_objectid; | |
6212 | } | |
6213 | ||
6214 | ret = btrfs_search_slot(trans, extent_root, | |
6215 | &key, path, -1, 1); | |
6216 | if (ret > 0 && skinny_metadata && path->slots[0]) { | |
6217 | /* | |
6218 | * Couldn't find our skinny metadata item, | |
6219 | * see if we have ye olde extent item. | |
6220 | */ | |
6221 | path->slots[0]--; | |
6222 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
6223 | path->slots[0]); | |
6224 | if (key.objectid == bytenr && | |
6225 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
6226 | key.offset == num_bytes) | |
6227 | ret = 0; | |
6228 | } | |
6229 | ||
6230 | if (ret > 0 && skinny_metadata) { | |
6231 | skinny_metadata = false; | |
6232 | key.objectid = bytenr; | |
6233 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6234 | key.offset = num_bytes; | |
6235 | btrfs_release_path(path); | |
6236 | ret = btrfs_search_slot(trans, extent_root, | |
6237 | &key, path, -1, 1); | |
6238 | } | |
6239 | ||
6240 | if (ret) { | |
6241 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", | |
6242 | ret, bytenr); | |
6243 | if (ret > 0) | |
6244 | btrfs_print_leaf(extent_root, | |
6245 | path->nodes[0]); | |
6246 | } | |
6247 | if (ret < 0) { | |
6248 | btrfs_abort_transaction(trans, extent_root, ret); | |
6249 | goto out; | |
6250 | } | |
6251 | extent_slot = path->slots[0]; | |
6252 | } | |
6253 | } else if (WARN_ON(ret == -ENOENT)) { | |
6254 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
6255 | btrfs_err(info, | |
6256 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
6257 | bytenr, parent, root_objectid, owner_objectid, | |
6258 | owner_offset); | |
6259 | btrfs_abort_transaction(trans, extent_root, ret); | |
6260 | goto out; | |
6261 | } else { | |
6262 | btrfs_abort_transaction(trans, extent_root, ret); | |
6263 | goto out; | |
6264 | } | |
6265 | ||
6266 | leaf = path->nodes[0]; | |
6267 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
6268 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
6269 | if (item_size < sizeof(*ei)) { | |
6270 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
6271 | ret = convert_extent_item_v0(trans, extent_root, path, | |
6272 | owner_objectid, 0); | |
6273 | if (ret < 0) { | |
6274 | btrfs_abort_transaction(trans, extent_root, ret); | |
6275 | goto out; | |
6276 | } | |
6277 | ||
6278 | btrfs_release_path(path); | |
6279 | path->leave_spinning = 1; | |
6280 | ||
6281 | key.objectid = bytenr; | |
6282 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6283 | key.offset = num_bytes; | |
6284 | ||
6285 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
6286 | -1, 1); | |
6287 | if (ret) { | |
6288 | btrfs_err(info, "umm, got %d back from search, was looking for %llu", | |
6289 | ret, bytenr); | |
6290 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
6291 | } | |
6292 | if (ret < 0) { | |
6293 | btrfs_abort_transaction(trans, extent_root, ret); | |
6294 | goto out; | |
6295 | } | |
6296 | ||
6297 | extent_slot = path->slots[0]; | |
6298 | leaf = path->nodes[0]; | |
6299 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
6300 | } | |
6301 | #endif | |
6302 | BUG_ON(item_size < sizeof(*ei)); | |
6303 | ei = btrfs_item_ptr(leaf, extent_slot, | |
6304 | struct btrfs_extent_item); | |
6305 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && | |
6306 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
6307 | struct btrfs_tree_block_info *bi; | |
6308 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
6309 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
6310 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
6311 | } | |
6312 | ||
6313 | refs = btrfs_extent_refs(leaf, ei); | |
6314 | if (refs < refs_to_drop) { | |
6315 | btrfs_err(info, "trying to drop %d refs but we only have %Lu " | |
6316 | "for bytenr %Lu", refs_to_drop, refs, bytenr); | |
6317 | ret = -EINVAL; | |
6318 | btrfs_abort_transaction(trans, extent_root, ret); | |
6319 | goto out; | |
6320 | } | |
6321 | refs -= refs_to_drop; | |
6322 | ||
6323 | if (refs > 0) { | |
6324 | type = BTRFS_QGROUP_OPER_SUB_SHARED; | |
6325 | if (extent_op) | |
6326 | __run_delayed_extent_op(extent_op, leaf, ei); | |
6327 | /* | |
6328 | * In the case of inline back ref, reference count will | |
6329 | * be updated by remove_extent_backref | |
6330 | */ | |
6331 | if (iref) { | |
6332 | BUG_ON(!found_extent); | |
6333 | } else { | |
6334 | btrfs_set_extent_refs(leaf, ei, refs); | |
6335 | btrfs_mark_buffer_dirty(leaf); | |
6336 | } | |
6337 | if (found_extent) { | |
6338 | ret = remove_extent_backref(trans, extent_root, path, | |
6339 | iref, refs_to_drop, | |
6340 | is_data, &last_ref); | |
6341 | if (ret) { | |
6342 | btrfs_abort_transaction(trans, extent_root, ret); | |
6343 | goto out; | |
6344 | } | |
6345 | } | |
6346 | add_pinned_bytes(root->fs_info, -num_bytes, owner_objectid, | |
6347 | root_objectid); | |
6348 | } else { | |
6349 | if (found_extent) { | |
6350 | BUG_ON(is_data && refs_to_drop != | |
6351 | extent_data_ref_count(root, path, iref)); | |
6352 | if (iref) { | |
6353 | BUG_ON(path->slots[0] != extent_slot); | |
6354 | } else { | |
6355 | BUG_ON(path->slots[0] != extent_slot + 1); | |
6356 | path->slots[0] = extent_slot; | |
6357 | num_to_del = 2; | |
6358 | } | |
6359 | } | |
6360 | ||
6361 | last_ref = 1; | |
6362 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], | |
6363 | num_to_del); | |
6364 | if (ret) { | |
6365 | btrfs_abort_transaction(trans, extent_root, ret); | |
6366 | goto out; | |
6367 | } | |
6368 | btrfs_release_path(path); | |
6369 | ||
6370 | if (is_data) { | |
6371 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); | |
6372 | if (ret) { | |
6373 | btrfs_abort_transaction(trans, extent_root, ret); | |
6374 | goto out; | |
6375 | } | |
6376 | } | |
6377 | ||
6378 | ret = update_block_group(trans, root, bytenr, num_bytes, 0); | |
6379 | if (ret) { | |
6380 | btrfs_abort_transaction(trans, extent_root, ret); | |
6381 | goto out; | |
6382 | } | |
6383 | } | |
6384 | btrfs_release_path(path); | |
6385 | ||
6386 | /* Deal with the quota accounting */ | |
6387 | if (!ret && last_ref && !no_quota) { | |
6388 | int mod_seq = 0; | |
6389 | ||
6390 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID && | |
6391 | type == BTRFS_QGROUP_OPER_SUB_SHARED) | |
6392 | mod_seq = 1; | |
6393 | ||
6394 | ret = btrfs_qgroup_record_ref(trans, info, root_objectid, | |
6395 | bytenr, num_bytes, type, | |
6396 | mod_seq); | |
6397 | } | |
6398 | out: | |
6399 | btrfs_free_path(path); | |
6400 | return ret; | |
6401 | } | |
6402 | ||
6403 | /* | |
6404 | * when we free an block, it is possible (and likely) that we free the last | |
6405 | * delayed ref for that extent as well. This searches the delayed ref tree for | |
6406 | * a given extent, and if there are no other delayed refs to be processed, it | |
6407 | * removes it from the tree. | |
6408 | */ | |
6409 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
6410 | struct btrfs_root *root, u64 bytenr) | |
6411 | { | |
6412 | struct btrfs_delayed_ref_head *head; | |
6413 | struct btrfs_delayed_ref_root *delayed_refs; | |
6414 | int ret = 0; | |
6415 | ||
6416 | delayed_refs = &trans->transaction->delayed_refs; | |
6417 | spin_lock(&delayed_refs->lock); | |
6418 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
6419 | if (!head) | |
6420 | goto out_delayed_unlock; | |
6421 | ||
6422 | spin_lock(&head->lock); | |
6423 | if (!list_empty(&head->ref_list)) | |
6424 | goto out; | |
6425 | ||
6426 | if (head->extent_op) { | |
6427 | if (!head->must_insert_reserved) | |
6428 | goto out; | |
6429 | btrfs_free_delayed_extent_op(head->extent_op); | |
6430 | head->extent_op = NULL; | |
6431 | } | |
6432 | ||
6433 | /* | |
6434 | * waiting for the lock here would deadlock. If someone else has it | |
6435 | * locked they are already in the process of dropping it anyway | |
6436 | */ | |
6437 | if (!mutex_trylock(&head->mutex)) | |
6438 | goto out; | |
6439 | ||
6440 | /* | |
6441 | * at this point we have a head with no other entries. Go | |
6442 | * ahead and process it. | |
6443 | */ | |
6444 | head->node.in_tree = 0; | |
6445 | rb_erase(&head->href_node, &delayed_refs->href_root); | |
6446 | ||
6447 | atomic_dec(&delayed_refs->num_entries); | |
6448 | ||
6449 | /* | |
6450 | * we don't take a ref on the node because we're removing it from the | |
6451 | * tree, so we just steal the ref the tree was holding. | |
6452 | */ | |
6453 | delayed_refs->num_heads--; | |
6454 | if (head->processing == 0) | |
6455 | delayed_refs->num_heads_ready--; | |
6456 | head->processing = 0; | |
6457 | spin_unlock(&head->lock); | |
6458 | spin_unlock(&delayed_refs->lock); | |
6459 | ||
6460 | BUG_ON(head->extent_op); | |
6461 | if (head->must_insert_reserved) | |
6462 | ret = 1; | |
6463 | ||
6464 | mutex_unlock(&head->mutex); | |
6465 | btrfs_put_delayed_ref(&head->node); | |
6466 | return ret; | |
6467 | out: | |
6468 | spin_unlock(&head->lock); | |
6469 | ||
6470 | out_delayed_unlock: | |
6471 | spin_unlock(&delayed_refs->lock); | |
6472 | return 0; | |
6473 | } | |
6474 | ||
6475 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, | |
6476 | struct btrfs_root *root, | |
6477 | struct extent_buffer *buf, | |
6478 | u64 parent, int last_ref) | |
6479 | { | |
6480 | int pin = 1; | |
6481 | int ret; | |
6482 | ||
6483 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6484 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, | |
6485 | buf->start, buf->len, | |
6486 | parent, root->root_key.objectid, | |
6487 | btrfs_header_level(buf), | |
6488 | BTRFS_DROP_DELAYED_REF, NULL, 0); | |
6489 | BUG_ON(ret); /* -ENOMEM */ | |
6490 | } | |
6491 | ||
6492 | if (!last_ref) | |
6493 | return; | |
6494 | ||
6495 | if (btrfs_header_generation(buf) == trans->transid) { | |
6496 | struct btrfs_block_group_cache *cache; | |
6497 | ||
6498 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6499 | ret = check_ref_cleanup(trans, root, buf->start); | |
6500 | if (!ret) | |
6501 | goto out; | |
6502 | } | |
6503 | ||
6504 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); | |
6505 | ||
6506 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
6507 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
6508 | btrfs_put_block_group(cache); | |
6509 | goto out; | |
6510 | } | |
6511 | ||
6512 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
6513 | ||
6514 | btrfs_add_free_space(cache, buf->start, buf->len); | |
6515 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE, 0); | |
6516 | btrfs_put_block_group(cache); | |
6517 | trace_btrfs_reserved_extent_free(root, buf->start, buf->len); | |
6518 | pin = 0; | |
6519 | } | |
6520 | out: | |
6521 | if (pin) | |
6522 | add_pinned_bytes(root->fs_info, buf->len, | |
6523 | btrfs_header_level(buf), | |
6524 | root->root_key.objectid); | |
6525 | ||
6526 | /* | |
6527 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
6528 | * anymore. | |
6529 | */ | |
6530 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
6531 | } | |
6532 | ||
6533 | /* Can return -ENOMEM */ | |
6534 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
6535 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
6536 | u64 owner, u64 offset, int no_quota) | |
6537 | { | |
6538 | int ret; | |
6539 | struct btrfs_fs_info *fs_info = root->fs_info; | |
6540 | ||
6541 | if (btrfs_test_is_dummy_root(root)) | |
6542 | return 0; | |
6543 | ||
6544 | add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid); | |
6545 | ||
6546 | /* | |
6547 | * tree log blocks never actually go into the extent allocation | |
6548 | * tree, just update pinning info and exit early. | |
6549 | */ | |
6550 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { | |
6551 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
6552 | /* unlocks the pinned mutex */ | |
6553 | btrfs_pin_extent(root, bytenr, num_bytes, 1); | |
6554 | ret = 0; | |
6555 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
6556 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, | |
6557 | num_bytes, | |
6558 | parent, root_objectid, (int)owner, | |
6559 | BTRFS_DROP_DELAYED_REF, NULL, no_quota); | |
6560 | } else { | |
6561 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, | |
6562 | num_bytes, | |
6563 | parent, root_objectid, owner, | |
6564 | offset, BTRFS_DROP_DELAYED_REF, | |
6565 | NULL, no_quota); | |
6566 | } | |
6567 | return ret; | |
6568 | } | |
6569 | ||
6570 | /* | |
6571 | * when we wait for progress in the block group caching, its because | |
6572 | * our allocation attempt failed at least once. So, we must sleep | |
6573 | * and let some progress happen before we try again. | |
6574 | * | |
6575 | * This function will sleep at least once waiting for new free space to | |
6576 | * show up, and then it will check the block group free space numbers | |
6577 | * for our min num_bytes. Another option is to have it go ahead | |
6578 | * and look in the rbtree for a free extent of a given size, but this | |
6579 | * is a good start. | |
6580 | * | |
6581 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
6582 | * any of the information in this block group. | |
6583 | */ | |
6584 | static noinline void | |
6585 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
6586 | u64 num_bytes) | |
6587 | { | |
6588 | struct btrfs_caching_control *caching_ctl; | |
6589 | ||
6590 | caching_ctl = get_caching_control(cache); | |
6591 | if (!caching_ctl) | |
6592 | return; | |
6593 | ||
6594 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || | |
6595 | (cache->free_space_ctl->free_space >= num_bytes)); | |
6596 | ||
6597 | put_caching_control(caching_ctl); | |
6598 | } | |
6599 | ||
6600 | static noinline int | |
6601 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
6602 | { | |
6603 | struct btrfs_caching_control *caching_ctl; | |
6604 | int ret = 0; | |
6605 | ||
6606 | caching_ctl = get_caching_control(cache); | |
6607 | if (!caching_ctl) | |
6608 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; | |
6609 | ||
6610 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
6611 | if (cache->cached == BTRFS_CACHE_ERROR) | |
6612 | ret = -EIO; | |
6613 | put_caching_control(caching_ctl); | |
6614 | return ret; | |
6615 | } | |
6616 | ||
6617 | int __get_raid_index(u64 flags) | |
6618 | { | |
6619 | if (flags & BTRFS_BLOCK_GROUP_RAID10) | |
6620 | return BTRFS_RAID_RAID10; | |
6621 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) | |
6622 | return BTRFS_RAID_RAID1; | |
6623 | else if (flags & BTRFS_BLOCK_GROUP_DUP) | |
6624 | return BTRFS_RAID_DUP; | |
6625 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
6626 | return BTRFS_RAID_RAID0; | |
6627 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) | |
6628 | return BTRFS_RAID_RAID5; | |
6629 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) | |
6630 | return BTRFS_RAID_RAID6; | |
6631 | ||
6632 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ | |
6633 | } | |
6634 | ||
6635 | int get_block_group_index(struct btrfs_block_group_cache *cache) | |
6636 | { | |
6637 | return __get_raid_index(cache->flags); | |
6638 | } | |
6639 | ||
6640 | static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = { | |
6641 | [BTRFS_RAID_RAID10] = "raid10", | |
6642 | [BTRFS_RAID_RAID1] = "raid1", | |
6643 | [BTRFS_RAID_DUP] = "dup", | |
6644 | [BTRFS_RAID_RAID0] = "raid0", | |
6645 | [BTRFS_RAID_SINGLE] = "single", | |
6646 | [BTRFS_RAID_RAID5] = "raid5", | |
6647 | [BTRFS_RAID_RAID6] = "raid6", | |
6648 | }; | |
6649 | ||
6650 | static const char *get_raid_name(enum btrfs_raid_types type) | |
6651 | { | |
6652 | if (type >= BTRFS_NR_RAID_TYPES) | |
6653 | return NULL; | |
6654 | ||
6655 | return btrfs_raid_type_names[type]; | |
6656 | } | |
6657 | ||
6658 | enum btrfs_loop_type { | |
6659 | LOOP_CACHING_NOWAIT = 0, | |
6660 | LOOP_CACHING_WAIT = 1, | |
6661 | LOOP_ALLOC_CHUNK = 2, | |
6662 | LOOP_NO_EMPTY_SIZE = 3, | |
6663 | }; | |
6664 | ||
6665 | static inline void | |
6666 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, | |
6667 | int delalloc) | |
6668 | { | |
6669 | if (delalloc) | |
6670 | down_read(&cache->data_rwsem); | |
6671 | } | |
6672 | ||
6673 | static inline void | |
6674 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, | |
6675 | int delalloc) | |
6676 | { | |
6677 | btrfs_get_block_group(cache); | |
6678 | if (delalloc) | |
6679 | down_read(&cache->data_rwsem); | |
6680 | } | |
6681 | ||
6682 | static struct btrfs_block_group_cache * | |
6683 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, | |
6684 | struct btrfs_free_cluster *cluster, | |
6685 | int delalloc) | |
6686 | { | |
6687 | struct btrfs_block_group_cache *used_bg; | |
6688 | bool locked = false; | |
6689 | again: | |
6690 | spin_lock(&cluster->refill_lock); | |
6691 | if (locked) { | |
6692 | if (used_bg == cluster->block_group) | |
6693 | return used_bg; | |
6694 | ||
6695 | up_read(&used_bg->data_rwsem); | |
6696 | btrfs_put_block_group(used_bg); | |
6697 | } | |
6698 | ||
6699 | used_bg = cluster->block_group; | |
6700 | if (!used_bg) | |
6701 | return NULL; | |
6702 | ||
6703 | if (used_bg == block_group) | |
6704 | return used_bg; | |
6705 | ||
6706 | btrfs_get_block_group(used_bg); | |
6707 | ||
6708 | if (!delalloc) | |
6709 | return used_bg; | |
6710 | ||
6711 | if (down_read_trylock(&used_bg->data_rwsem)) | |
6712 | return used_bg; | |
6713 | ||
6714 | spin_unlock(&cluster->refill_lock); | |
6715 | down_read(&used_bg->data_rwsem); | |
6716 | locked = true; | |
6717 | goto again; | |
6718 | } | |
6719 | ||
6720 | static inline void | |
6721 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, | |
6722 | int delalloc) | |
6723 | { | |
6724 | if (delalloc) | |
6725 | up_read(&cache->data_rwsem); | |
6726 | btrfs_put_block_group(cache); | |
6727 | } | |
6728 | ||
6729 | /* | |
6730 | * walks the btree of allocated extents and find a hole of a given size. | |
6731 | * The key ins is changed to record the hole: | |
6732 | * ins->objectid == start position | |
6733 | * ins->flags = BTRFS_EXTENT_ITEM_KEY | |
6734 | * ins->offset == the size of the hole. | |
6735 | * Any available blocks before search_start are skipped. | |
6736 | * | |
6737 | * If there is no suitable free space, we will record the max size of | |
6738 | * the free space extent currently. | |
6739 | */ | |
6740 | static noinline int find_free_extent(struct btrfs_root *orig_root, | |
6741 | u64 num_bytes, u64 empty_size, | |
6742 | u64 hint_byte, struct btrfs_key *ins, | |
6743 | u64 flags, int delalloc) | |
6744 | { | |
6745 | int ret = 0; | |
6746 | struct btrfs_root *root = orig_root->fs_info->extent_root; | |
6747 | struct btrfs_free_cluster *last_ptr = NULL; | |
6748 | struct btrfs_block_group_cache *block_group = NULL; | |
6749 | u64 search_start = 0; | |
6750 | u64 max_extent_size = 0; | |
6751 | int empty_cluster = 2 * 1024 * 1024; | |
6752 | struct btrfs_space_info *space_info; | |
6753 | int loop = 0; | |
6754 | int index = __get_raid_index(flags); | |
6755 | int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ? | |
6756 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
6757 | bool failed_cluster_refill = false; | |
6758 | bool failed_alloc = false; | |
6759 | bool use_cluster = true; | |
6760 | bool have_caching_bg = false; | |
6761 | ||
6762 | WARN_ON(num_bytes < root->sectorsize); | |
6763 | ins->type = BTRFS_EXTENT_ITEM_KEY; | |
6764 | ins->objectid = 0; | |
6765 | ins->offset = 0; | |
6766 | ||
6767 | trace_find_free_extent(orig_root, num_bytes, empty_size, flags); | |
6768 | ||
6769 | space_info = __find_space_info(root->fs_info, flags); | |
6770 | if (!space_info) { | |
6771 | btrfs_err(root->fs_info, "No space info for %llu", flags); | |
6772 | return -ENOSPC; | |
6773 | } | |
6774 | ||
6775 | /* | |
6776 | * If the space info is for both data and metadata it means we have a | |
6777 | * small filesystem and we can't use the clustering stuff. | |
6778 | */ | |
6779 | if (btrfs_mixed_space_info(space_info)) | |
6780 | use_cluster = false; | |
6781 | ||
6782 | if (flags & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { | |
6783 | last_ptr = &root->fs_info->meta_alloc_cluster; | |
6784 | if (!btrfs_test_opt(root, SSD)) | |
6785 | empty_cluster = 64 * 1024; | |
6786 | } | |
6787 | ||
6788 | if ((flags & BTRFS_BLOCK_GROUP_DATA) && use_cluster && | |
6789 | btrfs_test_opt(root, SSD)) { | |
6790 | last_ptr = &root->fs_info->data_alloc_cluster; | |
6791 | } | |
6792 | ||
6793 | if (last_ptr) { | |
6794 | spin_lock(&last_ptr->lock); | |
6795 | if (last_ptr->block_group) | |
6796 | hint_byte = last_ptr->window_start; | |
6797 | spin_unlock(&last_ptr->lock); | |
6798 | } | |
6799 | ||
6800 | search_start = max(search_start, first_logical_byte(root, 0)); | |
6801 | search_start = max(search_start, hint_byte); | |
6802 | ||
6803 | if (!last_ptr) | |
6804 | empty_cluster = 0; | |
6805 | ||
6806 | if (search_start == hint_byte) { | |
6807 | block_group = btrfs_lookup_block_group(root->fs_info, | |
6808 | search_start); | |
6809 | /* | |
6810 | * we don't want to use the block group if it doesn't match our | |
6811 | * allocation bits, or if its not cached. | |
6812 | * | |
6813 | * However if we are re-searching with an ideal block group | |
6814 | * picked out then we don't care that the block group is cached. | |
6815 | */ | |
6816 | if (block_group && block_group_bits(block_group, flags) && | |
6817 | block_group->cached != BTRFS_CACHE_NO) { | |
6818 | down_read(&space_info->groups_sem); | |
6819 | if (list_empty(&block_group->list) || | |
6820 | block_group->ro) { | |
6821 | /* | |
6822 | * someone is removing this block group, | |
6823 | * we can't jump into the have_block_group | |
6824 | * target because our list pointers are not | |
6825 | * valid | |
6826 | */ | |
6827 | btrfs_put_block_group(block_group); | |
6828 | up_read(&space_info->groups_sem); | |
6829 | } else { | |
6830 | index = get_block_group_index(block_group); | |
6831 | btrfs_lock_block_group(block_group, delalloc); | |
6832 | goto have_block_group; | |
6833 | } | |
6834 | } else if (block_group) { | |
6835 | btrfs_put_block_group(block_group); | |
6836 | } | |
6837 | } | |
6838 | search: | |
6839 | have_caching_bg = false; | |
6840 | down_read(&space_info->groups_sem); | |
6841 | list_for_each_entry(block_group, &space_info->block_groups[index], | |
6842 | list) { | |
6843 | u64 offset; | |
6844 | int cached; | |
6845 | ||
6846 | btrfs_grab_block_group(block_group, delalloc); | |
6847 | search_start = block_group->key.objectid; | |
6848 | ||
6849 | /* | |
6850 | * this can happen if we end up cycling through all the | |
6851 | * raid types, but we want to make sure we only allocate | |
6852 | * for the proper type. | |
6853 | */ | |
6854 | if (!block_group_bits(block_group, flags)) { | |
6855 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
6856 | BTRFS_BLOCK_GROUP_RAID1 | | |
6857 | BTRFS_BLOCK_GROUP_RAID5 | | |
6858 | BTRFS_BLOCK_GROUP_RAID6 | | |
6859 | BTRFS_BLOCK_GROUP_RAID10; | |
6860 | ||
6861 | /* | |
6862 | * if they asked for extra copies and this block group | |
6863 | * doesn't provide them, bail. This does allow us to | |
6864 | * fill raid0 from raid1. | |
6865 | */ | |
6866 | if ((flags & extra) && !(block_group->flags & extra)) | |
6867 | goto loop; | |
6868 | } | |
6869 | ||
6870 | have_block_group: | |
6871 | cached = block_group_cache_done(block_group); | |
6872 | if (unlikely(!cached)) { | |
6873 | ret = cache_block_group(block_group, 0); | |
6874 | BUG_ON(ret < 0); | |
6875 | ret = 0; | |
6876 | } | |
6877 | ||
6878 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) | |
6879 | goto loop; | |
6880 | if (unlikely(block_group->ro)) | |
6881 | goto loop; | |
6882 | ||
6883 | /* | |
6884 | * Ok we want to try and use the cluster allocator, so | |
6885 | * lets look there | |
6886 | */ | |
6887 | if (last_ptr) { | |
6888 | struct btrfs_block_group_cache *used_block_group; | |
6889 | unsigned long aligned_cluster; | |
6890 | /* | |
6891 | * the refill lock keeps out other | |
6892 | * people trying to start a new cluster | |
6893 | */ | |
6894 | used_block_group = btrfs_lock_cluster(block_group, | |
6895 | last_ptr, | |
6896 | delalloc); | |
6897 | if (!used_block_group) | |
6898 | goto refill_cluster; | |
6899 | ||
6900 | if (used_block_group != block_group && | |
6901 | (used_block_group->ro || | |
6902 | !block_group_bits(used_block_group, flags))) | |
6903 | goto release_cluster; | |
6904 | ||
6905 | offset = btrfs_alloc_from_cluster(used_block_group, | |
6906 | last_ptr, | |
6907 | num_bytes, | |
6908 | used_block_group->key.objectid, | |
6909 | &max_extent_size); | |
6910 | if (offset) { | |
6911 | /* we have a block, we're done */ | |
6912 | spin_unlock(&last_ptr->refill_lock); | |
6913 | trace_btrfs_reserve_extent_cluster(root, | |
6914 | used_block_group, | |
6915 | search_start, num_bytes); | |
6916 | if (used_block_group != block_group) { | |
6917 | btrfs_release_block_group(block_group, | |
6918 | delalloc); | |
6919 | block_group = used_block_group; | |
6920 | } | |
6921 | goto checks; | |
6922 | } | |
6923 | ||
6924 | WARN_ON(last_ptr->block_group != used_block_group); | |
6925 | release_cluster: | |
6926 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't | |
6927 | * set up a new clusters, so lets just skip it | |
6928 | * and let the allocator find whatever block | |
6929 | * it can find. If we reach this point, we | |
6930 | * will have tried the cluster allocator | |
6931 | * plenty of times and not have found | |
6932 | * anything, so we are likely way too | |
6933 | * fragmented for the clustering stuff to find | |
6934 | * anything. | |
6935 | * | |
6936 | * However, if the cluster is taken from the | |
6937 | * current block group, release the cluster | |
6938 | * first, so that we stand a better chance of | |
6939 | * succeeding in the unclustered | |
6940 | * allocation. */ | |
6941 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
6942 | used_block_group != block_group) { | |
6943 | spin_unlock(&last_ptr->refill_lock); | |
6944 | btrfs_release_block_group(used_block_group, | |
6945 | delalloc); | |
6946 | goto unclustered_alloc; | |
6947 | } | |
6948 | ||
6949 | /* | |
6950 | * this cluster didn't work out, free it and | |
6951 | * start over | |
6952 | */ | |
6953 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
6954 | ||
6955 | if (used_block_group != block_group) | |
6956 | btrfs_release_block_group(used_block_group, | |
6957 | delalloc); | |
6958 | refill_cluster: | |
6959 | if (loop >= LOOP_NO_EMPTY_SIZE) { | |
6960 | spin_unlock(&last_ptr->refill_lock); | |
6961 | goto unclustered_alloc; | |
6962 | } | |
6963 | ||
6964 | aligned_cluster = max_t(unsigned long, | |
6965 | empty_cluster + empty_size, | |
6966 | block_group->full_stripe_len); | |
6967 | ||
6968 | /* allocate a cluster in this block group */ | |
6969 | ret = btrfs_find_space_cluster(root, block_group, | |
6970 | last_ptr, search_start, | |
6971 | num_bytes, | |
6972 | aligned_cluster); | |
6973 | if (ret == 0) { | |
6974 | /* | |
6975 | * now pull our allocation out of this | |
6976 | * cluster | |
6977 | */ | |
6978 | offset = btrfs_alloc_from_cluster(block_group, | |
6979 | last_ptr, | |
6980 | num_bytes, | |
6981 | search_start, | |
6982 | &max_extent_size); | |
6983 | if (offset) { | |
6984 | /* we found one, proceed */ | |
6985 | spin_unlock(&last_ptr->refill_lock); | |
6986 | trace_btrfs_reserve_extent_cluster(root, | |
6987 | block_group, search_start, | |
6988 | num_bytes); | |
6989 | goto checks; | |
6990 | } | |
6991 | } else if (!cached && loop > LOOP_CACHING_NOWAIT | |
6992 | && !failed_cluster_refill) { | |
6993 | spin_unlock(&last_ptr->refill_lock); | |
6994 | ||
6995 | failed_cluster_refill = true; | |
6996 | wait_block_group_cache_progress(block_group, | |
6997 | num_bytes + empty_cluster + empty_size); | |
6998 | goto have_block_group; | |
6999 | } | |
7000 | ||
7001 | /* | |
7002 | * at this point we either didn't find a cluster | |
7003 | * or we weren't able to allocate a block from our | |
7004 | * cluster. Free the cluster we've been trying | |
7005 | * to use, and go to the next block group | |
7006 | */ | |
7007 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
7008 | spin_unlock(&last_ptr->refill_lock); | |
7009 | goto loop; | |
7010 | } | |
7011 | ||
7012 | unclustered_alloc: | |
7013 | spin_lock(&block_group->free_space_ctl->tree_lock); | |
7014 | if (cached && | |
7015 | block_group->free_space_ctl->free_space < | |
7016 | num_bytes + empty_cluster + empty_size) { | |
7017 | if (block_group->free_space_ctl->free_space > | |
7018 | max_extent_size) | |
7019 | max_extent_size = | |
7020 | block_group->free_space_ctl->free_space; | |
7021 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
7022 | goto loop; | |
7023 | } | |
7024 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
7025 | ||
7026 | offset = btrfs_find_space_for_alloc(block_group, search_start, | |
7027 | num_bytes, empty_size, | |
7028 | &max_extent_size); | |
7029 | /* | |
7030 | * If we didn't find a chunk, and we haven't failed on this | |
7031 | * block group before, and this block group is in the middle of | |
7032 | * caching and we are ok with waiting, then go ahead and wait | |
7033 | * for progress to be made, and set failed_alloc to true. | |
7034 | * | |
7035 | * If failed_alloc is true then we've already waited on this | |
7036 | * block group once and should move on to the next block group. | |
7037 | */ | |
7038 | if (!offset && !failed_alloc && !cached && | |
7039 | loop > LOOP_CACHING_NOWAIT) { | |
7040 | wait_block_group_cache_progress(block_group, | |
7041 | num_bytes + empty_size); | |
7042 | failed_alloc = true; | |
7043 | goto have_block_group; | |
7044 | } else if (!offset) { | |
7045 | if (!cached) | |
7046 | have_caching_bg = true; | |
7047 | goto loop; | |
7048 | } | |
7049 | checks: | |
7050 | search_start = ALIGN(offset, root->stripesize); | |
7051 | ||
7052 | /* move on to the next group */ | |
7053 | if (search_start + num_bytes > | |
7054 | block_group->key.objectid + block_group->key.offset) { | |
7055 | btrfs_add_free_space(block_group, offset, num_bytes); | |
7056 | goto loop; | |
7057 | } | |
7058 | ||
7059 | if (offset < search_start) | |
7060 | btrfs_add_free_space(block_group, offset, | |
7061 | search_start - offset); | |
7062 | BUG_ON(offset > search_start); | |
7063 | ||
7064 | ret = btrfs_update_reserved_bytes(block_group, num_bytes, | |
7065 | alloc_type, delalloc); | |
7066 | if (ret == -EAGAIN) { | |
7067 | btrfs_add_free_space(block_group, offset, num_bytes); | |
7068 | goto loop; | |
7069 | } | |
7070 | ||
7071 | /* we are all good, lets return */ | |
7072 | ins->objectid = search_start; | |
7073 | ins->offset = num_bytes; | |
7074 | ||
7075 | trace_btrfs_reserve_extent(orig_root, block_group, | |
7076 | search_start, num_bytes); | |
7077 | btrfs_release_block_group(block_group, delalloc); | |
7078 | break; | |
7079 | loop: | |
7080 | failed_cluster_refill = false; | |
7081 | failed_alloc = false; | |
7082 | BUG_ON(index != get_block_group_index(block_group)); | |
7083 | btrfs_release_block_group(block_group, delalloc); | |
7084 | } | |
7085 | up_read(&space_info->groups_sem); | |
7086 | ||
7087 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) | |
7088 | goto search; | |
7089 | ||
7090 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) | |
7091 | goto search; | |
7092 | ||
7093 | /* | |
7094 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking | |
7095 | * caching kthreads as we move along | |
7096 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching | |
7097 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
7098 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
7099 | * again | |
7100 | */ | |
7101 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { | |
7102 | index = 0; | |
7103 | loop++; | |
7104 | if (loop == LOOP_ALLOC_CHUNK) { | |
7105 | struct btrfs_trans_handle *trans; | |
7106 | int exist = 0; | |
7107 | ||
7108 | trans = current->journal_info; | |
7109 | if (trans) | |
7110 | exist = 1; | |
7111 | else | |
7112 | trans = btrfs_join_transaction(root); | |
7113 | ||
7114 | if (IS_ERR(trans)) { | |
7115 | ret = PTR_ERR(trans); | |
7116 | goto out; | |
7117 | } | |
7118 | ||
7119 | ret = do_chunk_alloc(trans, root, flags, | |
7120 | CHUNK_ALLOC_FORCE); | |
7121 | /* | |
7122 | * Do not bail out on ENOSPC since we | |
7123 | * can do more things. | |
7124 | */ | |
7125 | if (ret < 0 && ret != -ENOSPC) | |
7126 | btrfs_abort_transaction(trans, | |
7127 | root, ret); | |
7128 | else | |
7129 | ret = 0; | |
7130 | if (!exist) | |
7131 | btrfs_end_transaction(trans, root); | |
7132 | if (ret) | |
7133 | goto out; | |
7134 | } | |
7135 | ||
7136 | if (loop == LOOP_NO_EMPTY_SIZE) { | |
7137 | empty_size = 0; | |
7138 | empty_cluster = 0; | |
7139 | } | |
7140 | ||
7141 | goto search; | |
7142 | } else if (!ins->objectid) { | |
7143 | ret = -ENOSPC; | |
7144 | } else if (ins->objectid) { | |
7145 | ret = 0; | |
7146 | } | |
7147 | out: | |
7148 | if (ret == -ENOSPC) | |
7149 | ins->offset = max_extent_size; | |
7150 | return ret; | |
7151 | } | |
7152 | ||
7153 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, | |
7154 | int dump_block_groups) | |
7155 | { | |
7156 | struct btrfs_block_group_cache *cache; | |
7157 | int index = 0; | |
7158 | ||
7159 | spin_lock(&info->lock); | |
7160 | printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n", | |
7161 | info->flags, | |
7162 | info->total_bytes - info->bytes_used - info->bytes_pinned - | |
7163 | info->bytes_reserved - info->bytes_readonly, | |
7164 | (info->full) ? "" : "not "); | |
7165 | printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, " | |
7166 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
7167 | info->total_bytes, info->bytes_used, info->bytes_pinned, | |
7168 | info->bytes_reserved, info->bytes_may_use, | |
7169 | info->bytes_readonly); | |
7170 | spin_unlock(&info->lock); | |
7171 | ||
7172 | if (!dump_block_groups) | |
7173 | return; | |
7174 | ||
7175 | down_read(&info->groups_sem); | |
7176 | again: | |
7177 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
7178 | spin_lock(&cache->lock); | |
7179 | printk(KERN_INFO "BTRFS: " | |
7180 | "block group %llu has %llu bytes, " | |
7181 | "%llu used %llu pinned %llu reserved %s\n", | |
7182 | cache->key.objectid, cache->key.offset, | |
7183 | btrfs_block_group_used(&cache->item), cache->pinned, | |
7184 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
7185 | btrfs_dump_free_space(cache, bytes); | |
7186 | spin_unlock(&cache->lock); | |
7187 | } | |
7188 | if (++index < BTRFS_NR_RAID_TYPES) | |
7189 | goto again; | |
7190 | up_read(&info->groups_sem); | |
7191 | } | |
7192 | ||
7193 | int btrfs_reserve_extent(struct btrfs_root *root, | |
7194 | u64 num_bytes, u64 min_alloc_size, | |
7195 | u64 empty_size, u64 hint_byte, | |
7196 | struct btrfs_key *ins, int is_data, int delalloc) | |
7197 | { | |
7198 | bool final_tried = false; | |
7199 | u64 flags; | |
7200 | int ret; | |
7201 | ||
7202 | flags = btrfs_get_alloc_profile(root, is_data); | |
7203 | again: | |
7204 | WARN_ON(num_bytes < root->sectorsize); | |
7205 | ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins, | |
7206 | flags, delalloc); | |
7207 | ||
7208 | if (ret == -ENOSPC) { | |
7209 | if (!final_tried && ins->offset) { | |
7210 | num_bytes = min(num_bytes >> 1, ins->offset); | |
7211 | num_bytes = round_down(num_bytes, root->sectorsize); | |
7212 | num_bytes = max(num_bytes, min_alloc_size); | |
7213 | if (num_bytes == min_alloc_size) | |
7214 | final_tried = true; | |
7215 | goto again; | |
7216 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
7217 | struct btrfs_space_info *sinfo; | |
7218 | ||
7219 | sinfo = __find_space_info(root->fs_info, flags); | |
7220 | btrfs_err(root->fs_info, "allocation failed flags %llu, wanted %llu", | |
7221 | flags, num_bytes); | |
7222 | if (sinfo) | |
7223 | dump_space_info(sinfo, num_bytes, 1); | |
7224 | } | |
7225 | } | |
7226 | ||
7227 | return ret; | |
7228 | } | |
7229 | ||
7230 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, | |
7231 | u64 start, u64 len, | |
7232 | int pin, int delalloc) | |
7233 | { | |
7234 | struct btrfs_block_group_cache *cache; | |
7235 | int ret = 0; | |
7236 | ||
7237 | cache = btrfs_lookup_block_group(root->fs_info, start); | |
7238 | if (!cache) { | |
7239 | btrfs_err(root->fs_info, "Unable to find block group for %llu", | |
7240 | start); | |
7241 | return -ENOSPC; | |
7242 | } | |
7243 | ||
7244 | if (pin) | |
7245 | pin_down_extent(root, cache, start, len, 1); | |
7246 | else { | |
7247 | if (btrfs_test_opt(root, DISCARD)) | |
7248 | ret = btrfs_discard_extent(root, start, len, NULL); | |
7249 | btrfs_add_free_space(cache, start, len); | |
7250 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc); | |
7251 | } | |
7252 | ||
7253 | btrfs_put_block_group(cache); | |
7254 | ||
7255 | trace_btrfs_reserved_extent_free(root, start, len); | |
7256 | ||
7257 | return ret; | |
7258 | } | |
7259 | ||
7260 | int btrfs_free_reserved_extent(struct btrfs_root *root, | |
7261 | u64 start, u64 len, int delalloc) | |
7262 | { | |
7263 | return __btrfs_free_reserved_extent(root, start, len, 0, delalloc); | |
7264 | } | |
7265 | ||
7266 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
7267 | u64 start, u64 len) | |
7268 | { | |
7269 | return __btrfs_free_reserved_extent(root, start, len, 1, 0); | |
7270 | } | |
7271 | ||
7272 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
7273 | struct btrfs_root *root, | |
7274 | u64 parent, u64 root_objectid, | |
7275 | u64 flags, u64 owner, u64 offset, | |
7276 | struct btrfs_key *ins, int ref_mod) | |
7277 | { | |
7278 | int ret; | |
7279 | struct btrfs_fs_info *fs_info = root->fs_info; | |
7280 | struct btrfs_extent_item *extent_item; | |
7281 | struct btrfs_extent_inline_ref *iref; | |
7282 | struct btrfs_path *path; | |
7283 | struct extent_buffer *leaf; | |
7284 | int type; | |
7285 | u32 size; | |
7286 | ||
7287 | if (parent > 0) | |
7288 | type = BTRFS_SHARED_DATA_REF_KEY; | |
7289 | else | |
7290 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
7291 | ||
7292 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); | |
7293 | ||
7294 | path = btrfs_alloc_path(); | |
7295 | if (!path) | |
7296 | return -ENOMEM; | |
7297 | ||
7298 | path->leave_spinning = 1; | |
7299 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
7300 | ins, size); | |
7301 | if (ret) { | |
7302 | btrfs_free_path(path); | |
7303 | return ret; | |
7304 | } | |
7305 | ||
7306 | leaf = path->nodes[0]; | |
7307 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
7308 | struct btrfs_extent_item); | |
7309 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); | |
7310 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
7311 | btrfs_set_extent_flags(leaf, extent_item, | |
7312 | flags | BTRFS_EXTENT_FLAG_DATA); | |
7313 | ||
7314 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
7315 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
7316 | if (parent > 0) { | |
7317 | struct btrfs_shared_data_ref *ref; | |
7318 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
7319 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
7320 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
7321 | } else { | |
7322 | struct btrfs_extent_data_ref *ref; | |
7323 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
7324 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
7325 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
7326 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
7327 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
7328 | } | |
7329 | ||
7330 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7331 | btrfs_free_path(path); | |
7332 | ||
7333 | /* Always set parent to 0 here since its exclusive anyway. */ | |
7334 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, | |
7335 | ins->objectid, ins->offset, | |
7336 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); | |
7337 | if (ret) | |
7338 | return ret; | |
7339 | ||
7340 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); | |
7341 | if (ret) { /* -ENOENT, logic error */ | |
7342 | btrfs_err(fs_info, "update block group failed for %llu %llu", | |
7343 | ins->objectid, ins->offset); | |
7344 | BUG(); | |
7345 | } | |
7346 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); | |
7347 | return ret; | |
7348 | } | |
7349 | ||
7350 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
7351 | struct btrfs_root *root, | |
7352 | u64 parent, u64 root_objectid, | |
7353 | u64 flags, struct btrfs_disk_key *key, | |
7354 | int level, struct btrfs_key *ins, | |
7355 | int no_quota) | |
7356 | { | |
7357 | int ret; | |
7358 | struct btrfs_fs_info *fs_info = root->fs_info; | |
7359 | struct btrfs_extent_item *extent_item; | |
7360 | struct btrfs_tree_block_info *block_info; | |
7361 | struct btrfs_extent_inline_ref *iref; | |
7362 | struct btrfs_path *path; | |
7363 | struct extent_buffer *leaf; | |
7364 | u32 size = sizeof(*extent_item) + sizeof(*iref); | |
7365 | u64 num_bytes = ins->offset; | |
7366 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
7367 | SKINNY_METADATA); | |
7368 | ||
7369 | if (!skinny_metadata) | |
7370 | size += sizeof(*block_info); | |
7371 | ||
7372 | path = btrfs_alloc_path(); | |
7373 | if (!path) { | |
7374 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, | |
7375 | root->nodesize); | |
7376 | return -ENOMEM; | |
7377 | } | |
7378 | ||
7379 | path->leave_spinning = 1; | |
7380 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
7381 | ins, size); | |
7382 | if (ret) { | |
7383 | btrfs_free_path(path); | |
7384 | btrfs_free_and_pin_reserved_extent(root, ins->objectid, | |
7385 | root->nodesize); | |
7386 | return ret; | |
7387 | } | |
7388 | ||
7389 | leaf = path->nodes[0]; | |
7390 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
7391 | struct btrfs_extent_item); | |
7392 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
7393 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
7394 | btrfs_set_extent_flags(leaf, extent_item, | |
7395 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
7396 | ||
7397 | if (skinny_metadata) { | |
7398 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
7399 | num_bytes = root->nodesize; | |
7400 | } else { | |
7401 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
7402 | btrfs_set_tree_block_key(leaf, block_info, key); | |
7403 | btrfs_set_tree_block_level(leaf, block_info, level); | |
7404 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
7405 | } | |
7406 | ||
7407 | if (parent > 0) { | |
7408 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
7409 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
7410 | BTRFS_SHARED_BLOCK_REF_KEY); | |
7411 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
7412 | } else { | |
7413 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
7414 | BTRFS_TREE_BLOCK_REF_KEY); | |
7415 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
7416 | } | |
7417 | ||
7418 | btrfs_mark_buffer_dirty(leaf); | |
7419 | btrfs_free_path(path); | |
7420 | ||
7421 | if (!no_quota) { | |
7422 | ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid, | |
7423 | ins->objectid, num_bytes, | |
7424 | BTRFS_QGROUP_OPER_ADD_EXCL, 0); | |
7425 | if (ret) | |
7426 | return ret; | |
7427 | } | |
7428 | ||
7429 | ret = update_block_group(trans, root, ins->objectid, root->nodesize, | |
7430 | 1); | |
7431 | if (ret) { /* -ENOENT, logic error */ | |
7432 | btrfs_err(fs_info, "update block group failed for %llu %llu", | |
7433 | ins->objectid, ins->offset); | |
7434 | BUG(); | |
7435 | } | |
7436 | ||
7437 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, root->nodesize); | |
7438 | return ret; | |
7439 | } | |
7440 | ||
7441 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
7442 | struct btrfs_root *root, | |
7443 | u64 root_objectid, u64 owner, | |
7444 | u64 offset, struct btrfs_key *ins) | |
7445 | { | |
7446 | int ret; | |
7447 | ||
7448 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
7449 | ||
7450 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, | |
7451 | ins->offset, 0, | |
7452 | root_objectid, owner, offset, | |
7453 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
7454 | return ret; | |
7455 | } | |
7456 | ||
7457 | /* | |
7458 | * this is used by the tree logging recovery code. It records that | |
7459 | * an extent has been allocated and makes sure to clear the free | |
7460 | * space cache bits as well | |
7461 | */ | |
7462 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, | |
7463 | struct btrfs_root *root, | |
7464 | u64 root_objectid, u64 owner, u64 offset, | |
7465 | struct btrfs_key *ins) | |
7466 | { | |
7467 | int ret; | |
7468 | struct btrfs_block_group_cache *block_group; | |
7469 | ||
7470 | /* | |
7471 | * Mixed block groups will exclude before processing the log so we only | |
7472 | * need to do the exlude dance if this fs isn't mixed. | |
7473 | */ | |
7474 | if (!btrfs_fs_incompat(root->fs_info, MIXED_GROUPS)) { | |
7475 | ret = __exclude_logged_extent(root, ins->objectid, ins->offset); | |
7476 | if (ret) | |
7477 | return ret; | |
7478 | } | |
7479 | ||
7480 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); | |
7481 | if (!block_group) | |
7482 | return -EINVAL; | |
7483 | ||
7484 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, | |
7485 | RESERVE_ALLOC_NO_ACCOUNT, 0); | |
7486 | BUG_ON(ret); /* logic error */ | |
7487 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, | |
7488 | 0, owner, offset, ins, 1); | |
7489 | btrfs_put_block_group(block_group); | |
7490 | return ret; | |
7491 | } | |
7492 | ||
7493 | static struct extent_buffer * | |
7494 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
7495 | u64 bytenr, int level) | |
7496 | { | |
7497 | struct extent_buffer *buf; | |
7498 | ||
7499 | buf = btrfs_find_create_tree_block(root, bytenr); | |
7500 | if (!buf) | |
7501 | return ERR_PTR(-ENOMEM); | |
7502 | btrfs_set_header_generation(buf, trans->transid); | |
7503 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); | |
7504 | btrfs_tree_lock(buf); | |
7505 | clean_tree_block(trans, root->fs_info, buf); | |
7506 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); | |
7507 | ||
7508 | btrfs_set_lock_blocking(buf); | |
7509 | btrfs_set_buffer_uptodate(buf); | |
7510 | ||
7511 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { | |
7512 | buf->log_index = root->log_transid % 2; | |
7513 | /* | |
7514 | * we allow two log transactions at a time, use different | |
7515 | * EXENT bit to differentiate dirty pages. | |
7516 | */ | |
7517 | if (buf->log_index == 0) | |
7518 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
7519 | buf->start + buf->len - 1, GFP_NOFS); | |
7520 | else | |
7521 | set_extent_new(&root->dirty_log_pages, buf->start, | |
7522 | buf->start + buf->len - 1, GFP_NOFS); | |
7523 | } else { | |
7524 | buf->log_index = -1; | |
7525 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
7526 | buf->start + buf->len - 1, GFP_NOFS); | |
7527 | } | |
7528 | trans->blocks_used++; | |
7529 | /* this returns a buffer locked for blocking */ | |
7530 | return buf; | |
7531 | } | |
7532 | ||
7533 | static struct btrfs_block_rsv * | |
7534 | use_block_rsv(struct btrfs_trans_handle *trans, | |
7535 | struct btrfs_root *root, u32 blocksize) | |
7536 | { | |
7537 | struct btrfs_block_rsv *block_rsv; | |
7538 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
7539 | int ret; | |
7540 | bool global_updated = false; | |
7541 | ||
7542 | block_rsv = get_block_rsv(trans, root); | |
7543 | ||
7544 | if (unlikely(block_rsv->size == 0)) | |
7545 | goto try_reserve; | |
7546 | again: | |
7547 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
7548 | if (!ret) | |
7549 | return block_rsv; | |
7550 | ||
7551 | if (block_rsv->failfast) | |
7552 | return ERR_PTR(ret); | |
7553 | ||
7554 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { | |
7555 | global_updated = true; | |
7556 | update_global_block_rsv(root->fs_info); | |
7557 | goto again; | |
7558 | } | |
7559 | ||
7560 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
7561 | static DEFINE_RATELIMIT_STATE(_rs, | |
7562 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
7563 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
7564 | if (__ratelimit(&_rs)) | |
7565 | WARN(1, KERN_DEBUG | |
7566 | "BTRFS: block rsv returned %d\n", ret); | |
7567 | } | |
7568 | try_reserve: | |
7569 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
7570 | BTRFS_RESERVE_NO_FLUSH); | |
7571 | if (!ret) | |
7572 | return block_rsv; | |
7573 | /* | |
7574 | * If we couldn't reserve metadata bytes try and use some from | |
7575 | * the global reserve if its space type is the same as the global | |
7576 | * reservation. | |
7577 | */ | |
7578 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && | |
7579 | block_rsv->space_info == global_rsv->space_info) { | |
7580 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
7581 | if (!ret) | |
7582 | return global_rsv; | |
7583 | } | |
7584 | return ERR_PTR(ret); | |
7585 | } | |
7586 | ||
7587 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, | |
7588 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
7589 | { | |
7590 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
7591 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); | |
7592 | } | |
7593 | ||
7594 | /* | |
7595 | * finds a free extent and does all the dirty work required for allocation | |
7596 | * returns the key for the extent through ins, and a tree buffer for | |
7597 | * the first block of the extent through buf. | |
7598 | * | |
7599 | * returns the tree buffer or an ERR_PTR on error. | |
7600 | */ | |
7601 | struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, | |
7602 | struct btrfs_root *root, | |
7603 | u64 parent, u64 root_objectid, | |
7604 | struct btrfs_disk_key *key, int level, | |
7605 | u64 hint, u64 empty_size) | |
7606 | { | |
7607 | struct btrfs_key ins; | |
7608 | struct btrfs_block_rsv *block_rsv; | |
7609 | struct extent_buffer *buf; | |
7610 | struct btrfs_delayed_extent_op *extent_op; | |
7611 | u64 flags = 0; | |
7612 | int ret; | |
7613 | u32 blocksize = root->nodesize; | |
7614 | bool skinny_metadata = btrfs_fs_incompat(root->fs_info, | |
7615 | SKINNY_METADATA); | |
7616 | ||
7617 | if (btrfs_test_is_dummy_root(root)) { | |
7618 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, | |
7619 | level); | |
7620 | if (!IS_ERR(buf)) | |
7621 | root->alloc_bytenr += blocksize; | |
7622 | return buf; | |
7623 | } | |
7624 | ||
7625 | block_rsv = use_block_rsv(trans, root, blocksize); | |
7626 | if (IS_ERR(block_rsv)) | |
7627 | return ERR_CAST(block_rsv); | |
7628 | ||
7629 | ret = btrfs_reserve_extent(root, blocksize, blocksize, | |
7630 | empty_size, hint, &ins, 0, 0); | |
7631 | if (ret) | |
7632 | goto out_unuse; | |
7633 | ||
7634 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, level); | |
7635 | if (IS_ERR(buf)) { | |
7636 | ret = PTR_ERR(buf); | |
7637 | goto out_free_reserved; | |
7638 | } | |
7639 | ||
7640 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
7641 | if (parent == 0) | |
7642 | parent = ins.objectid; | |
7643 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7644 | } else | |
7645 | BUG_ON(parent > 0); | |
7646 | ||
7647 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
7648 | extent_op = btrfs_alloc_delayed_extent_op(); | |
7649 | if (!extent_op) { | |
7650 | ret = -ENOMEM; | |
7651 | goto out_free_buf; | |
7652 | } | |
7653 | if (key) | |
7654 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
7655 | else | |
7656 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
7657 | extent_op->flags_to_set = flags; | |
7658 | if (skinny_metadata) | |
7659 | extent_op->update_key = 0; | |
7660 | else | |
7661 | extent_op->update_key = 1; | |
7662 | extent_op->update_flags = 1; | |
7663 | extent_op->is_data = 0; | |
7664 | extent_op->level = level; | |
7665 | ||
7666 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, | |
7667 | ins.objectid, ins.offset, | |
7668 | parent, root_objectid, level, | |
7669 | BTRFS_ADD_DELAYED_EXTENT, | |
7670 | extent_op, 0); | |
7671 | if (ret) | |
7672 | goto out_free_delayed; | |
7673 | } | |
7674 | return buf; | |
7675 | ||
7676 | out_free_delayed: | |
7677 | btrfs_free_delayed_extent_op(extent_op); | |
7678 | out_free_buf: | |
7679 | free_extent_buffer(buf); | |
7680 | out_free_reserved: | |
7681 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 0); | |
7682 | out_unuse: | |
7683 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); | |
7684 | return ERR_PTR(ret); | |
7685 | } | |
7686 | ||
7687 | struct walk_control { | |
7688 | u64 refs[BTRFS_MAX_LEVEL]; | |
7689 | u64 flags[BTRFS_MAX_LEVEL]; | |
7690 | struct btrfs_key update_progress; | |
7691 | int stage; | |
7692 | int level; | |
7693 | int shared_level; | |
7694 | int update_ref; | |
7695 | int keep_locks; | |
7696 | int reada_slot; | |
7697 | int reada_count; | |
7698 | int for_reloc; | |
7699 | }; | |
7700 | ||
7701 | #define DROP_REFERENCE 1 | |
7702 | #define UPDATE_BACKREF 2 | |
7703 | ||
7704 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, | |
7705 | struct btrfs_root *root, | |
7706 | struct walk_control *wc, | |
7707 | struct btrfs_path *path) | |
7708 | { | |
7709 | u64 bytenr; | |
7710 | u64 generation; | |
7711 | u64 refs; | |
7712 | u64 flags; | |
7713 | u32 nritems; | |
7714 | u32 blocksize; | |
7715 | struct btrfs_key key; | |
7716 | struct extent_buffer *eb; | |
7717 | int ret; | |
7718 | int slot; | |
7719 | int nread = 0; | |
7720 | ||
7721 | if (path->slots[wc->level] < wc->reada_slot) { | |
7722 | wc->reada_count = wc->reada_count * 2 / 3; | |
7723 | wc->reada_count = max(wc->reada_count, 2); | |
7724 | } else { | |
7725 | wc->reada_count = wc->reada_count * 3 / 2; | |
7726 | wc->reada_count = min_t(int, wc->reada_count, | |
7727 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
7728 | } | |
7729 | ||
7730 | eb = path->nodes[wc->level]; | |
7731 | nritems = btrfs_header_nritems(eb); | |
7732 | blocksize = root->nodesize; | |
7733 | ||
7734 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { | |
7735 | if (nread >= wc->reada_count) | |
7736 | break; | |
7737 | ||
7738 | cond_resched(); | |
7739 | bytenr = btrfs_node_blockptr(eb, slot); | |
7740 | generation = btrfs_node_ptr_generation(eb, slot); | |
7741 | ||
7742 | if (slot == path->slots[wc->level]) | |
7743 | goto reada; | |
7744 | ||
7745 | if (wc->stage == UPDATE_BACKREF && | |
7746 | generation <= root->root_key.offset) | |
7747 | continue; | |
7748 | ||
7749 | /* We don't lock the tree block, it's OK to be racy here */ | |
7750 | ret = btrfs_lookup_extent_info(trans, root, bytenr, | |
7751 | wc->level - 1, 1, &refs, | |
7752 | &flags); | |
7753 | /* We don't care about errors in readahead. */ | |
7754 | if (ret < 0) | |
7755 | continue; | |
7756 | BUG_ON(refs == 0); | |
7757 | ||
7758 | if (wc->stage == DROP_REFERENCE) { | |
7759 | if (refs == 1) | |
7760 | goto reada; | |
7761 | ||
7762 | if (wc->level == 1 && | |
7763 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7764 | continue; | |
7765 | if (!wc->update_ref || | |
7766 | generation <= root->root_key.offset) | |
7767 | continue; | |
7768 | btrfs_node_key_to_cpu(eb, &key, slot); | |
7769 | ret = btrfs_comp_cpu_keys(&key, | |
7770 | &wc->update_progress); | |
7771 | if (ret < 0) | |
7772 | continue; | |
7773 | } else { | |
7774 | if (wc->level == 1 && | |
7775 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
7776 | continue; | |
7777 | } | |
7778 | reada: | |
7779 | readahead_tree_block(root, bytenr); | |
7780 | nread++; | |
7781 | } | |
7782 | wc->reada_slot = slot; | |
7783 | } | |
7784 | ||
7785 | static int account_leaf_items(struct btrfs_trans_handle *trans, | |
7786 | struct btrfs_root *root, | |
7787 | struct extent_buffer *eb) | |
7788 | { | |
7789 | int nr = btrfs_header_nritems(eb); | |
7790 | int i, extent_type, ret; | |
7791 | struct btrfs_key key; | |
7792 | struct btrfs_file_extent_item *fi; | |
7793 | u64 bytenr, num_bytes; | |
7794 | ||
7795 | for (i = 0; i < nr; i++) { | |
7796 | btrfs_item_key_to_cpu(eb, &key, i); | |
7797 | ||
7798 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
7799 | continue; | |
7800 | ||
7801 | fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
7802 | /* filter out non qgroup-accountable extents */ | |
7803 | extent_type = btrfs_file_extent_type(eb, fi); | |
7804 | ||
7805 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) | |
7806 | continue; | |
7807 | ||
7808 | bytenr = btrfs_file_extent_disk_bytenr(eb, fi); | |
7809 | if (!bytenr) | |
7810 | continue; | |
7811 | ||
7812 | num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); | |
7813 | ||
7814 | ret = btrfs_qgroup_record_ref(trans, root->fs_info, | |
7815 | root->objectid, | |
7816 | bytenr, num_bytes, | |
7817 | BTRFS_QGROUP_OPER_SUB_SUBTREE, 0); | |
7818 | if (ret) | |
7819 | return ret; | |
7820 | } | |
7821 | return 0; | |
7822 | } | |
7823 | ||
7824 | /* | |
7825 | * Walk up the tree from the bottom, freeing leaves and any interior | |
7826 | * nodes which have had all slots visited. If a node (leaf or | |
7827 | * interior) is freed, the node above it will have it's slot | |
7828 | * incremented. The root node will never be freed. | |
7829 | * | |
7830 | * At the end of this function, we should have a path which has all | |
7831 | * slots incremented to the next position for a search. If we need to | |
7832 | * read a new node it will be NULL and the node above it will have the | |
7833 | * correct slot selected for a later read. | |
7834 | * | |
7835 | * If we increment the root nodes slot counter past the number of | |
7836 | * elements, 1 is returned to signal completion of the search. | |
7837 | */ | |
7838 | static int adjust_slots_upwards(struct btrfs_root *root, | |
7839 | struct btrfs_path *path, int root_level) | |
7840 | { | |
7841 | int level = 0; | |
7842 | int nr, slot; | |
7843 | struct extent_buffer *eb; | |
7844 | ||
7845 | if (root_level == 0) | |
7846 | return 1; | |
7847 | ||
7848 | while (level <= root_level) { | |
7849 | eb = path->nodes[level]; | |
7850 | nr = btrfs_header_nritems(eb); | |
7851 | path->slots[level]++; | |
7852 | slot = path->slots[level]; | |
7853 | if (slot >= nr || level == 0) { | |
7854 | /* | |
7855 | * Don't free the root - we will detect this | |
7856 | * condition after our loop and return a | |
7857 | * positive value for caller to stop walking the tree. | |
7858 | */ | |
7859 | if (level != root_level) { | |
7860 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
7861 | path->locks[level] = 0; | |
7862 | ||
7863 | free_extent_buffer(eb); | |
7864 | path->nodes[level] = NULL; | |
7865 | path->slots[level] = 0; | |
7866 | } | |
7867 | } else { | |
7868 | /* | |
7869 | * We have a valid slot to walk back down | |
7870 | * from. Stop here so caller can process these | |
7871 | * new nodes. | |
7872 | */ | |
7873 | break; | |
7874 | } | |
7875 | ||
7876 | level++; | |
7877 | } | |
7878 | ||
7879 | eb = path->nodes[root_level]; | |
7880 | if (path->slots[root_level] >= btrfs_header_nritems(eb)) | |
7881 | return 1; | |
7882 | ||
7883 | return 0; | |
7884 | } | |
7885 | ||
7886 | /* | |
7887 | * root_eb is the subtree root and is locked before this function is called. | |
7888 | */ | |
7889 | static int account_shared_subtree(struct btrfs_trans_handle *trans, | |
7890 | struct btrfs_root *root, | |
7891 | struct extent_buffer *root_eb, | |
7892 | u64 root_gen, | |
7893 | int root_level) | |
7894 | { | |
7895 | int ret = 0; | |
7896 | int level; | |
7897 | struct extent_buffer *eb = root_eb; | |
7898 | struct btrfs_path *path = NULL; | |
7899 | ||
7900 | BUG_ON(root_level < 0 || root_level > BTRFS_MAX_LEVEL); | |
7901 | BUG_ON(root_eb == NULL); | |
7902 | ||
7903 | if (!root->fs_info->quota_enabled) | |
7904 | return 0; | |
7905 | ||
7906 | if (!extent_buffer_uptodate(root_eb)) { | |
7907 | ret = btrfs_read_buffer(root_eb, root_gen); | |
7908 | if (ret) | |
7909 | goto out; | |
7910 | } | |
7911 | ||
7912 | if (root_level == 0) { | |
7913 | ret = account_leaf_items(trans, root, root_eb); | |
7914 | goto out; | |
7915 | } | |
7916 | ||
7917 | path = btrfs_alloc_path(); | |
7918 | if (!path) | |
7919 | return -ENOMEM; | |
7920 | ||
7921 | /* | |
7922 | * Walk down the tree. Missing extent blocks are filled in as | |
7923 | * we go. Metadata is accounted every time we read a new | |
7924 | * extent block. | |
7925 | * | |
7926 | * When we reach a leaf, we account for file extent items in it, | |
7927 | * walk back up the tree (adjusting slot pointers as we go) | |
7928 | * and restart the search process. | |
7929 | */ | |
7930 | extent_buffer_get(root_eb); /* For path */ | |
7931 | path->nodes[root_level] = root_eb; | |
7932 | path->slots[root_level] = 0; | |
7933 | path->locks[root_level] = 0; /* so release_path doesn't try to unlock */ | |
7934 | walk_down: | |
7935 | level = root_level; | |
7936 | while (level >= 0) { | |
7937 | if (path->nodes[level] == NULL) { | |
7938 | int parent_slot; | |
7939 | u64 child_gen; | |
7940 | u64 child_bytenr; | |
7941 | ||
7942 | /* We need to get child blockptr/gen from | |
7943 | * parent before we can read it. */ | |
7944 | eb = path->nodes[level + 1]; | |
7945 | parent_slot = path->slots[level + 1]; | |
7946 | child_bytenr = btrfs_node_blockptr(eb, parent_slot); | |
7947 | child_gen = btrfs_node_ptr_generation(eb, parent_slot); | |
7948 | ||
7949 | eb = read_tree_block(root, child_bytenr, child_gen); | |
7950 | if (IS_ERR(eb)) { | |
7951 | ret = PTR_ERR(eb); | |
7952 | goto out; | |
7953 | } else if (!extent_buffer_uptodate(eb)) { | |
7954 | free_extent_buffer(eb); | |
7955 | ret = -EIO; | |
7956 | goto out; | |
7957 | } | |
7958 | ||
7959 | path->nodes[level] = eb; | |
7960 | path->slots[level] = 0; | |
7961 | ||
7962 | btrfs_tree_read_lock(eb); | |
7963 | btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); | |
7964 | path->locks[level] = BTRFS_READ_LOCK_BLOCKING; | |
7965 | ||
7966 | ret = btrfs_qgroup_record_ref(trans, root->fs_info, | |
7967 | root->objectid, | |
7968 | child_bytenr, | |
7969 | root->nodesize, | |
7970 | BTRFS_QGROUP_OPER_SUB_SUBTREE, | |
7971 | 0); | |
7972 | if (ret) | |
7973 | goto out; | |
7974 | ||
7975 | } | |
7976 | ||
7977 | if (level == 0) { | |
7978 | ret = account_leaf_items(trans, root, path->nodes[level]); | |
7979 | if (ret) | |
7980 | goto out; | |
7981 | ||
7982 | /* Nonzero return here means we completed our search */ | |
7983 | ret = adjust_slots_upwards(root, path, root_level); | |
7984 | if (ret) | |
7985 | break; | |
7986 | ||
7987 | /* Restart search with new slots */ | |
7988 | goto walk_down; | |
7989 | } | |
7990 | ||
7991 | level--; | |
7992 | } | |
7993 | ||
7994 | ret = 0; | |
7995 | out: | |
7996 | btrfs_free_path(path); | |
7997 | ||
7998 | return ret; | |
7999 | } | |
8000 | ||
8001 | /* | |
8002 | * helper to process tree block while walking down the tree. | |
8003 | * | |
8004 | * when wc->stage == UPDATE_BACKREF, this function updates | |
8005 | * back refs for pointers in the block. | |
8006 | * | |
8007 | * NOTE: return value 1 means we should stop walking down. | |
8008 | */ | |
8009 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, | |
8010 | struct btrfs_root *root, | |
8011 | struct btrfs_path *path, | |
8012 | struct walk_control *wc, int lookup_info) | |
8013 | { | |
8014 | int level = wc->level; | |
8015 | struct extent_buffer *eb = path->nodes[level]; | |
8016 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
8017 | int ret; | |
8018 | ||
8019 | if (wc->stage == UPDATE_BACKREF && | |
8020 | btrfs_header_owner(eb) != root->root_key.objectid) | |
8021 | return 1; | |
8022 | ||
8023 | /* | |
8024 | * when reference count of tree block is 1, it won't increase | |
8025 | * again. once full backref flag is set, we never clear it. | |
8026 | */ | |
8027 | if (lookup_info && | |
8028 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
8029 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
8030 | BUG_ON(!path->locks[level]); | |
8031 | ret = btrfs_lookup_extent_info(trans, root, | |
8032 | eb->start, level, 1, | |
8033 | &wc->refs[level], | |
8034 | &wc->flags[level]); | |
8035 | BUG_ON(ret == -ENOMEM); | |
8036 | if (ret) | |
8037 | return ret; | |
8038 | BUG_ON(wc->refs[level] == 0); | |
8039 | } | |
8040 | ||
8041 | if (wc->stage == DROP_REFERENCE) { | |
8042 | if (wc->refs[level] > 1) | |
8043 | return 1; | |
8044 | ||
8045 | if (path->locks[level] && !wc->keep_locks) { | |
8046 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
8047 | path->locks[level] = 0; | |
8048 | } | |
8049 | return 0; | |
8050 | } | |
8051 | ||
8052 | /* wc->stage == UPDATE_BACKREF */ | |
8053 | if (!(wc->flags[level] & flag)) { | |
8054 | BUG_ON(!path->locks[level]); | |
8055 | ret = btrfs_inc_ref(trans, root, eb, 1); | |
8056 | BUG_ON(ret); /* -ENOMEM */ | |
8057 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
8058 | BUG_ON(ret); /* -ENOMEM */ | |
8059 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, | |
8060 | eb->len, flag, | |
8061 | btrfs_header_level(eb), 0); | |
8062 | BUG_ON(ret); /* -ENOMEM */ | |
8063 | wc->flags[level] |= flag; | |
8064 | } | |
8065 | ||
8066 | /* | |
8067 | * the block is shared by multiple trees, so it's not good to | |
8068 | * keep the tree lock | |
8069 | */ | |
8070 | if (path->locks[level] && level > 0) { | |
8071 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
8072 | path->locks[level] = 0; | |
8073 | } | |
8074 | return 0; | |
8075 | } | |
8076 | ||
8077 | /* | |
8078 | * helper to process tree block pointer. | |
8079 | * | |
8080 | * when wc->stage == DROP_REFERENCE, this function checks | |
8081 | * reference count of the block pointed to. if the block | |
8082 | * is shared and we need update back refs for the subtree | |
8083 | * rooted at the block, this function changes wc->stage to | |
8084 | * UPDATE_BACKREF. if the block is shared and there is no | |
8085 | * need to update back, this function drops the reference | |
8086 | * to the block. | |
8087 | * | |
8088 | * NOTE: return value 1 means we should stop walking down. | |
8089 | */ | |
8090 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
8091 | struct btrfs_root *root, | |
8092 | struct btrfs_path *path, | |
8093 | struct walk_control *wc, int *lookup_info) | |
8094 | { | |
8095 | u64 bytenr; | |
8096 | u64 generation; | |
8097 | u64 parent; | |
8098 | u32 blocksize; | |
8099 | struct btrfs_key key; | |
8100 | struct extent_buffer *next; | |
8101 | int level = wc->level; | |
8102 | int reada = 0; | |
8103 | int ret = 0; | |
8104 | bool need_account = false; | |
8105 | ||
8106 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
8107 | path->slots[level]); | |
8108 | /* | |
8109 | * if the lower level block was created before the snapshot | |
8110 | * was created, we know there is no need to update back refs | |
8111 | * for the subtree | |
8112 | */ | |
8113 | if (wc->stage == UPDATE_BACKREF && | |
8114 | generation <= root->root_key.offset) { | |
8115 | *lookup_info = 1; | |
8116 | return 1; | |
8117 | } | |
8118 | ||
8119 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
8120 | blocksize = root->nodesize; | |
8121 | ||
8122 | next = btrfs_find_tree_block(root->fs_info, bytenr); | |
8123 | if (!next) { | |
8124 | next = btrfs_find_create_tree_block(root, bytenr); | |
8125 | if (!next) | |
8126 | return -ENOMEM; | |
8127 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, | |
8128 | level - 1); | |
8129 | reada = 1; | |
8130 | } | |
8131 | btrfs_tree_lock(next); | |
8132 | btrfs_set_lock_blocking(next); | |
8133 | ||
8134 | ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1, | |
8135 | &wc->refs[level - 1], | |
8136 | &wc->flags[level - 1]); | |
8137 | if (ret < 0) { | |
8138 | btrfs_tree_unlock(next); | |
8139 | return ret; | |
8140 | } | |
8141 | ||
8142 | if (unlikely(wc->refs[level - 1] == 0)) { | |
8143 | btrfs_err(root->fs_info, "Missing references."); | |
8144 | BUG(); | |
8145 | } | |
8146 | *lookup_info = 0; | |
8147 | ||
8148 | if (wc->stage == DROP_REFERENCE) { | |
8149 | if (wc->refs[level - 1] > 1) { | |
8150 | need_account = true; | |
8151 | if (level == 1 && | |
8152 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8153 | goto skip; | |
8154 | ||
8155 | if (!wc->update_ref || | |
8156 | generation <= root->root_key.offset) | |
8157 | goto skip; | |
8158 | ||
8159 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
8160 | path->slots[level]); | |
8161 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
8162 | if (ret < 0) | |
8163 | goto skip; | |
8164 | ||
8165 | wc->stage = UPDATE_BACKREF; | |
8166 | wc->shared_level = level - 1; | |
8167 | } | |
8168 | } else { | |
8169 | if (level == 1 && | |
8170 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8171 | goto skip; | |
8172 | } | |
8173 | ||
8174 | if (!btrfs_buffer_uptodate(next, generation, 0)) { | |
8175 | btrfs_tree_unlock(next); | |
8176 | free_extent_buffer(next); | |
8177 | next = NULL; | |
8178 | *lookup_info = 1; | |
8179 | } | |
8180 | ||
8181 | if (!next) { | |
8182 | if (reada && level == 1) | |
8183 | reada_walk_down(trans, root, wc, path); | |
8184 | next = read_tree_block(root, bytenr, generation); | |
8185 | if (IS_ERR(next)) { | |
8186 | return PTR_ERR(next); | |
8187 | } else if (!extent_buffer_uptodate(next)) { | |
8188 | free_extent_buffer(next); | |
8189 | return -EIO; | |
8190 | } | |
8191 | btrfs_tree_lock(next); | |
8192 | btrfs_set_lock_blocking(next); | |
8193 | } | |
8194 | ||
8195 | level--; | |
8196 | BUG_ON(level != btrfs_header_level(next)); | |
8197 | path->nodes[level] = next; | |
8198 | path->slots[level] = 0; | |
8199 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8200 | wc->level = level; | |
8201 | if (wc->level == 1) | |
8202 | wc->reada_slot = 0; | |
8203 | return 0; | |
8204 | skip: | |
8205 | wc->refs[level - 1] = 0; | |
8206 | wc->flags[level - 1] = 0; | |
8207 | if (wc->stage == DROP_REFERENCE) { | |
8208 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
8209 | parent = path->nodes[level]->start; | |
8210 | } else { | |
8211 | BUG_ON(root->root_key.objectid != | |
8212 | btrfs_header_owner(path->nodes[level])); | |
8213 | parent = 0; | |
8214 | } | |
8215 | ||
8216 | if (need_account) { | |
8217 | ret = account_shared_subtree(trans, root, next, | |
8218 | generation, level - 1); | |
8219 | if (ret) { | |
8220 | printk_ratelimited(KERN_ERR "BTRFS: %s Error " | |
8221 | "%d accounting shared subtree. Quota " | |
8222 | "is out of sync, rescan required.\n", | |
8223 | root->fs_info->sb->s_id, ret); | |
8224 | } | |
8225 | } | |
8226 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, | |
8227 | root->root_key.objectid, level - 1, 0, 0); | |
8228 | BUG_ON(ret); /* -ENOMEM */ | |
8229 | } | |
8230 | btrfs_tree_unlock(next); | |
8231 | free_extent_buffer(next); | |
8232 | *lookup_info = 1; | |
8233 | return 1; | |
8234 | } | |
8235 | ||
8236 | /* | |
8237 | * helper to process tree block while walking up the tree. | |
8238 | * | |
8239 | * when wc->stage == DROP_REFERENCE, this function drops | |
8240 | * reference count on the block. | |
8241 | * | |
8242 | * when wc->stage == UPDATE_BACKREF, this function changes | |
8243 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
8244 | * to UPDATE_BACKREF previously while processing the block. | |
8245 | * | |
8246 | * NOTE: return value 1 means we should stop walking up. | |
8247 | */ | |
8248 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
8249 | struct btrfs_root *root, | |
8250 | struct btrfs_path *path, | |
8251 | struct walk_control *wc) | |
8252 | { | |
8253 | int ret; | |
8254 | int level = wc->level; | |
8255 | struct extent_buffer *eb = path->nodes[level]; | |
8256 | u64 parent = 0; | |
8257 | ||
8258 | if (wc->stage == UPDATE_BACKREF) { | |
8259 | BUG_ON(wc->shared_level < level); | |
8260 | if (level < wc->shared_level) | |
8261 | goto out; | |
8262 | ||
8263 | ret = find_next_key(path, level + 1, &wc->update_progress); | |
8264 | if (ret > 0) | |
8265 | wc->update_ref = 0; | |
8266 | ||
8267 | wc->stage = DROP_REFERENCE; | |
8268 | wc->shared_level = -1; | |
8269 | path->slots[level] = 0; | |
8270 | ||
8271 | /* | |
8272 | * check reference count again if the block isn't locked. | |
8273 | * we should start walking down the tree again if reference | |
8274 | * count is one. | |
8275 | */ | |
8276 | if (!path->locks[level]) { | |
8277 | BUG_ON(level == 0); | |
8278 | btrfs_tree_lock(eb); | |
8279 | btrfs_set_lock_blocking(eb); | |
8280 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8281 | ||
8282 | ret = btrfs_lookup_extent_info(trans, root, | |
8283 | eb->start, level, 1, | |
8284 | &wc->refs[level], | |
8285 | &wc->flags[level]); | |
8286 | if (ret < 0) { | |
8287 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
8288 | path->locks[level] = 0; | |
8289 | return ret; | |
8290 | } | |
8291 | BUG_ON(wc->refs[level] == 0); | |
8292 | if (wc->refs[level] == 1) { | |
8293 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
8294 | path->locks[level] = 0; | |
8295 | return 1; | |
8296 | } | |
8297 | } | |
8298 | } | |
8299 | ||
8300 | /* wc->stage == DROP_REFERENCE */ | |
8301 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
8302 | ||
8303 | if (wc->refs[level] == 1) { | |
8304 | if (level == 0) { | |
8305 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8306 | ret = btrfs_dec_ref(trans, root, eb, 1); | |
8307 | else | |
8308 | ret = btrfs_dec_ref(trans, root, eb, 0); | |
8309 | BUG_ON(ret); /* -ENOMEM */ | |
8310 | ret = account_leaf_items(trans, root, eb); | |
8311 | if (ret) { | |
8312 | printk_ratelimited(KERN_ERR "BTRFS: %s Error " | |
8313 | "%d accounting leaf items. Quota " | |
8314 | "is out of sync, rescan required.\n", | |
8315 | root->fs_info->sb->s_id, ret); | |
8316 | } | |
8317 | } | |
8318 | /* make block locked assertion in clean_tree_block happy */ | |
8319 | if (!path->locks[level] && | |
8320 | btrfs_header_generation(eb) == trans->transid) { | |
8321 | btrfs_tree_lock(eb); | |
8322 | btrfs_set_lock_blocking(eb); | |
8323 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8324 | } | |
8325 | clean_tree_block(trans, root->fs_info, eb); | |
8326 | } | |
8327 | ||
8328 | if (eb == root->node) { | |
8329 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8330 | parent = eb->start; | |
8331 | else | |
8332 | BUG_ON(root->root_key.objectid != | |
8333 | btrfs_header_owner(eb)); | |
8334 | } else { | |
8335 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8336 | parent = path->nodes[level + 1]->start; | |
8337 | else | |
8338 | BUG_ON(root->root_key.objectid != | |
8339 | btrfs_header_owner(path->nodes[level + 1])); | |
8340 | } | |
8341 | ||
8342 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); | |
8343 | out: | |
8344 | wc->refs[level] = 0; | |
8345 | wc->flags[level] = 0; | |
8346 | return 0; | |
8347 | } | |
8348 | ||
8349 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
8350 | struct btrfs_root *root, | |
8351 | struct btrfs_path *path, | |
8352 | struct walk_control *wc) | |
8353 | { | |
8354 | int level = wc->level; | |
8355 | int lookup_info = 1; | |
8356 | int ret; | |
8357 | ||
8358 | while (level >= 0) { | |
8359 | ret = walk_down_proc(trans, root, path, wc, lookup_info); | |
8360 | if (ret > 0) | |
8361 | break; | |
8362 | ||
8363 | if (level == 0) | |
8364 | break; | |
8365 | ||
8366 | if (path->slots[level] >= | |
8367 | btrfs_header_nritems(path->nodes[level])) | |
8368 | break; | |
8369 | ||
8370 | ret = do_walk_down(trans, root, path, wc, &lookup_info); | |
8371 | if (ret > 0) { | |
8372 | path->slots[level]++; | |
8373 | continue; | |
8374 | } else if (ret < 0) | |
8375 | return ret; | |
8376 | level = wc->level; | |
8377 | } | |
8378 | return 0; | |
8379 | } | |
8380 | ||
8381 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, | |
8382 | struct btrfs_root *root, | |
8383 | struct btrfs_path *path, | |
8384 | struct walk_control *wc, int max_level) | |
8385 | { | |
8386 | int level = wc->level; | |
8387 | int ret; | |
8388 | ||
8389 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); | |
8390 | while (level < max_level && path->nodes[level]) { | |
8391 | wc->level = level; | |
8392 | if (path->slots[level] + 1 < | |
8393 | btrfs_header_nritems(path->nodes[level])) { | |
8394 | path->slots[level]++; | |
8395 | return 0; | |
8396 | } else { | |
8397 | ret = walk_up_proc(trans, root, path, wc); | |
8398 | if (ret > 0) | |
8399 | return 0; | |
8400 | ||
8401 | if (path->locks[level]) { | |
8402 | btrfs_tree_unlock_rw(path->nodes[level], | |
8403 | path->locks[level]); | |
8404 | path->locks[level] = 0; | |
8405 | } | |
8406 | free_extent_buffer(path->nodes[level]); | |
8407 | path->nodes[level] = NULL; | |
8408 | level++; | |
8409 | } | |
8410 | } | |
8411 | return 1; | |
8412 | } | |
8413 | ||
8414 | /* | |
8415 | * drop a subvolume tree. | |
8416 | * | |
8417 | * this function traverses the tree freeing any blocks that only | |
8418 | * referenced by the tree. | |
8419 | * | |
8420 | * when a shared tree block is found. this function decreases its | |
8421 | * reference count by one. if update_ref is true, this function | |
8422 | * also make sure backrefs for the shared block and all lower level | |
8423 | * blocks are properly updated. | |
8424 | * | |
8425 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
8426 | */ | |
8427 | int btrfs_drop_snapshot(struct btrfs_root *root, | |
8428 | struct btrfs_block_rsv *block_rsv, int update_ref, | |
8429 | int for_reloc) | |
8430 | { | |
8431 | struct btrfs_path *path; | |
8432 | struct btrfs_trans_handle *trans; | |
8433 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
8434 | struct btrfs_root_item *root_item = &root->root_item; | |
8435 | struct walk_control *wc; | |
8436 | struct btrfs_key key; | |
8437 | int err = 0; | |
8438 | int ret; | |
8439 | int level; | |
8440 | bool root_dropped = false; | |
8441 | ||
8442 | btrfs_debug(root->fs_info, "Drop subvolume %llu", root->objectid); | |
8443 | ||
8444 | path = btrfs_alloc_path(); | |
8445 | if (!path) { | |
8446 | err = -ENOMEM; | |
8447 | goto out; | |
8448 | } | |
8449 | ||
8450 | wc = kzalloc(sizeof(*wc), GFP_NOFS); | |
8451 | if (!wc) { | |
8452 | btrfs_free_path(path); | |
8453 | err = -ENOMEM; | |
8454 | goto out; | |
8455 | } | |
8456 | ||
8457 | trans = btrfs_start_transaction(tree_root, 0); | |
8458 | if (IS_ERR(trans)) { | |
8459 | err = PTR_ERR(trans); | |
8460 | goto out_free; | |
8461 | } | |
8462 | ||
8463 | if (block_rsv) | |
8464 | trans->block_rsv = block_rsv; | |
8465 | ||
8466 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { | |
8467 | level = btrfs_header_level(root->node); | |
8468 | path->nodes[level] = btrfs_lock_root_node(root); | |
8469 | btrfs_set_lock_blocking(path->nodes[level]); | |
8470 | path->slots[level] = 0; | |
8471 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8472 | memset(&wc->update_progress, 0, | |
8473 | sizeof(wc->update_progress)); | |
8474 | } else { | |
8475 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); | |
8476 | memcpy(&wc->update_progress, &key, | |
8477 | sizeof(wc->update_progress)); | |
8478 | ||
8479 | level = root_item->drop_level; | |
8480 | BUG_ON(level == 0); | |
8481 | path->lowest_level = level; | |
8482 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
8483 | path->lowest_level = 0; | |
8484 | if (ret < 0) { | |
8485 | err = ret; | |
8486 | goto out_end_trans; | |
8487 | } | |
8488 | WARN_ON(ret > 0); | |
8489 | ||
8490 | /* | |
8491 | * unlock our path, this is safe because only this | |
8492 | * function is allowed to delete this snapshot | |
8493 | */ | |
8494 | btrfs_unlock_up_safe(path, 0); | |
8495 | ||
8496 | level = btrfs_header_level(root->node); | |
8497 | while (1) { | |
8498 | btrfs_tree_lock(path->nodes[level]); | |
8499 | btrfs_set_lock_blocking(path->nodes[level]); | |
8500 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8501 | ||
8502 | ret = btrfs_lookup_extent_info(trans, root, | |
8503 | path->nodes[level]->start, | |
8504 | level, 1, &wc->refs[level], | |
8505 | &wc->flags[level]); | |
8506 | if (ret < 0) { | |
8507 | err = ret; | |
8508 | goto out_end_trans; | |
8509 | } | |
8510 | BUG_ON(wc->refs[level] == 0); | |
8511 | ||
8512 | if (level == root_item->drop_level) | |
8513 | break; | |
8514 | ||
8515 | btrfs_tree_unlock(path->nodes[level]); | |
8516 | path->locks[level] = 0; | |
8517 | WARN_ON(wc->refs[level] != 1); | |
8518 | level--; | |
8519 | } | |
8520 | } | |
8521 | ||
8522 | wc->level = level; | |
8523 | wc->shared_level = -1; | |
8524 | wc->stage = DROP_REFERENCE; | |
8525 | wc->update_ref = update_ref; | |
8526 | wc->keep_locks = 0; | |
8527 | wc->for_reloc = for_reloc; | |
8528 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); | |
8529 | ||
8530 | while (1) { | |
8531 | ||
8532 | ret = walk_down_tree(trans, root, path, wc); | |
8533 | if (ret < 0) { | |
8534 | err = ret; | |
8535 | break; | |
8536 | } | |
8537 | ||
8538 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); | |
8539 | if (ret < 0) { | |
8540 | err = ret; | |
8541 | break; | |
8542 | } | |
8543 | ||
8544 | if (ret > 0) { | |
8545 | BUG_ON(wc->stage != DROP_REFERENCE); | |
8546 | break; | |
8547 | } | |
8548 | ||
8549 | if (wc->stage == DROP_REFERENCE) { | |
8550 | level = wc->level; | |
8551 | btrfs_node_key(path->nodes[level], | |
8552 | &root_item->drop_progress, | |
8553 | path->slots[level]); | |
8554 | root_item->drop_level = level; | |
8555 | } | |
8556 | ||
8557 | BUG_ON(wc->level == 0); | |
8558 | if (btrfs_should_end_transaction(trans, tree_root) || | |
8559 | (!for_reloc && btrfs_need_cleaner_sleep(root))) { | |
8560 | ret = btrfs_update_root(trans, tree_root, | |
8561 | &root->root_key, | |
8562 | root_item); | |
8563 | if (ret) { | |
8564 | btrfs_abort_transaction(trans, tree_root, ret); | |
8565 | err = ret; | |
8566 | goto out_end_trans; | |
8567 | } | |
8568 | ||
8569 | /* | |
8570 | * Qgroup update accounting is run from | |
8571 | * delayed ref handling. This usually works | |
8572 | * out because delayed refs are normally the | |
8573 | * only way qgroup updates are added. However, | |
8574 | * we may have added updates during our tree | |
8575 | * walk so run qgroups here to make sure we | |
8576 | * don't lose any updates. | |
8577 | */ | |
8578 | ret = btrfs_delayed_qgroup_accounting(trans, | |
8579 | root->fs_info); | |
8580 | if (ret) | |
8581 | printk_ratelimited(KERN_ERR "BTRFS: Failure %d " | |
8582 | "running qgroup updates " | |
8583 | "during snapshot delete. " | |
8584 | "Quota is out of sync, " | |
8585 | "rescan required.\n", ret); | |
8586 | ||
8587 | btrfs_end_transaction_throttle(trans, tree_root); | |
8588 | if (!for_reloc && btrfs_need_cleaner_sleep(root)) { | |
8589 | pr_debug("BTRFS: drop snapshot early exit\n"); | |
8590 | err = -EAGAIN; | |
8591 | goto out_free; | |
8592 | } | |
8593 | ||
8594 | trans = btrfs_start_transaction(tree_root, 0); | |
8595 | if (IS_ERR(trans)) { | |
8596 | err = PTR_ERR(trans); | |
8597 | goto out_free; | |
8598 | } | |
8599 | if (block_rsv) | |
8600 | trans->block_rsv = block_rsv; | |
8601 | } | |
8602 | } | |
8603 | btrfs_release_path(path); | |
8604 | if (err) | |
8605 | goto out_end_trans; | |
8606 | ||
8607 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
8608 | if (ret) { | |
8609 | btrfs_abort_transaction(trans, tree_root, ret); | |
8610 | goto out_end_trans; | |
8611 | } | |
8612 | ||
8613 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { | |
8614 | ret = btrfs_find_root(tree_root, &root->root_key, path, | |
8615 | NULL, NULL); | |
8616 | if (ret < 0) { | |
8617 | btrfs_abort_transaction(trans, tree_root, ret); | |
8618 | err = ret; | |
8619 | goto out_end_trans; | |
8620 | } else if (ret > 0) { | |
8621 | /* if we fail to delete the orphan item this time | |
8622 | * around, it'll get picked up the next time. | |
8623 | * | |
8624 | * The most common failure here is just -ENOENT. | |
8625 | */ | |
8626 | btrfs_del_orphan_item(trans, tree_root, | |
8627 | root->root_key.objectid); | |
8628 | } | |
8629 | } | |
8630 | ||
8631 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { | |
8632 | btrfs_drop_and_free_fs_root(tree_root->fs_info, root); | |
8633 | } else { | |
8634 | free_extent_buffer(root->node); | |
8635 | free_extent_buffer(root->commit_root); | |
8636 | btrfs_put_fs_root(root); | |
8637 | } | |
8638 | root_dropped = true; | |
8639 | out_end_trans: | |
8640 | ret = btrfs_delayed_qgroup_accounting(trans, tree_root->fs_info); | |
8641 | if (ret) | |
8642 | printk_ratelimited(KERN_ERR "BTRFS: Failure %d " | |
8643 | "running qgroup updates " | |
8644 | "during snapshot delete. " | |
8645 | "Quota is out of sync, " | |
8646 | "rescan required.\n", ret); | |
8647 | ||
8648 | btrfs_end_transaction_throttle(trans, tree_root); | |
8649 | out_free: | |
8650 | kfree(wc); | |
8651 | btrfs_free_path(path); | |
8652 | out: | |
8653 | /* | |
8654 | * So if we need to stop dropping the snapshot for whatever reason we | |
8655 | * need to make sure to add it back to the dead root list so that we | |
8656 | * keep trying to do the work later. This also cleans up roots if we | |
8657 | * don't have it in the radix (like when we recover after a power fail | |
8658 | * or unmount) so we don't leak memory. | |
8659 | */ | |
8660 | if (!for_reloc && root_dropped == false) | |
8661 | btrfs_add_dead_root(root); | |
8662 | if (err && err != -EAGAIN) | |
8663 | btrfs_std_error(root->fs_info, err); | |
8664 | return err; | |
8665 | } | |
8666 | ||
8667 | /* | |
8668 | * drop subtree rooted at tree block 'node'. | |
8669 | * | |
8670 | * NOTE: this function will unlock and release tree block 'node' | |
8671 | * only used by relocation code | |
8672 | */ | |
8673 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, | |
8674 | struct btrfs_root *root, | |
8675 | struct extent_buffer *node, | |
8676 | struct extent_buffer *parent) | |
8677 | { | |
8678 | struct btrfs_path *path; | |
8679 | struct walk_control *wc; | |
8680 | int level; | |
8681 | int parent_level; | |
8682 | int ret = 0; | |
8683 | int wret; | |
8684 | ||
8685 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); | |
8686 | ||
8687 | path = btrfs_alloc_path(); | |
8688 | if (!path) | |
8689 | return -ENOMEM; | |
8690 | ||
8691 | wc = kzalloc(sizeof(*wc), GFP_NOFS); | |
8692 | if (!wc) { | |
8693 | btrfs_free_path(path); | |
8694 | return -ENOMEM; | |
8695 | } | |
8696 | ||
8697 | btrfs_assert_tree_locked(parent); | |
8698 | parent_level = btrfs_header_level(parent); | |
8699 | extent_buffer_get(parent); | |
8700 | path->nodes[parent_level] = parent; | |
8701 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
8702 | ||
8703 | btrfs_assert_tree_locked(node); | |
8704 | level = btrfs_header_level(node); | |
8705 | path->nodes[level] = node; | |
8706 | path->slots[level] = 0; | |
8707 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; | |
8708 | ||
8709 | wc->refs[parent_level] = 1; | |
8710 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
8711 | wc->level = level; | |
8712 | wc->shared_level = -1; | |
8713 | wc->stage = DROP_REFERENCE; | |
8714 | wc->update_ref = 0; | |
8715 | wc->keep_locks = 1; | |
8716 | wc->for_reloc = 1; | |
8717 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); | |
8718 | ||
8719 | while (1) { | |
8720 | wret = walk_down_tree(trans, root, path, wc); | |
8721 | if (wret < 0) { | |
8722 | ret = wret; | |
8723 | break; | |
8724 | } | |
8725 | ||
8726 | wret = walk_up_tree(trans, root, path, wc, parent_level); | |
8727 | if (wret < 0) | |
8728 | ret = wret; | |
8729 | if (wret != 0) | |
8730 | break; | |
8731 | } | |
8732 | ||
8733 | kfree(wc); | |
8734 | btrfs_free_path(path); | |
8735 | return ret; | |
8736 | } | |
8737 | ||
8738 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) | |
8739 | { | |
8740 | u64 num_devices; | |
8741 | u64 stripped; | |
8742 | ||
8743 | /* | |
8744 | * if restripe for this chunk_type is on pick target profile and | |
8745 | * return, otherwise do the usual balance | |
8746 | */ | |
8747 | stripped = get_restripe_target(root->fs_info, flags); | |
8748 | if (stripped) | |
8749 | return extended_to_chunk(stripped); | |
8750 | ||
8751 | num_devices = root->fs_info->fs_devices->rw_devices; | |
8752 | ||
8753 | stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
8754 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | | |
8755 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
8756 | ||
8757 | if (num_devices == 1) { | |
8758 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
8759 | stripped = flags & ~stripped; | |
8760 | ||
8761 | /* turn raid0 into single device chunks */ | |
8762 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
8763 | return stripped; | |
8764 | ||
8765 | /* turn mirroring into duplication */ | |
8766 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
8767 | BTRFS_BLOCK_GROUP_RAID10)) | |
8768 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
8769 | } else { | |
8770 | /* they already had raid on here, just return */ | |
8771 | if (flags & stripped) | |
8772 | return flags; | |
8773 | ||
8774 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
8775 | stripped = flags & ~stripped; | |
8776 | ||
8777 | /* switch duplicated blocks with raid1 */ | |
8778 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
8779 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
8780 | ||
8781 | /* this is drive concat, leave it alone */ | |
8782 | } | |
8783 | ||
8784 | return flags; | |
8785 | } | |
8786 | ||
8787 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) | |
8788 | { | |
8789 | struct btrfs_space_info *sinfo = cache->space_info; | |
8790 | u64 num_bytes; | |
8791 | u64 min_allocable_bytes; | |
8792 | int ret = -ENOSPC; | |
8793 | ||
8794 | ||
8795 | /* | |
8796 | * We need some metadata space and system metadata space for | |
8797 | * allocating chunks in some corner cases until we force to set | |
8798 | * it to be readonly. | |
8799 | */ | |
8800 | if ((sinfo->flags & | |
8801 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
8802 | !force) | |
8803 | min_allocable_bytes = 1 * 1024 * 1024; | |
8804 | else | |
8805 | min_allocable_bytes = 0; | |
8806 | ||
8807 | spin_lock(&sinfo->lock); | |
8808 | spin_lock(&cache->lock); | |
8809 | ||
8810 | if (cache->ro) { | |
8811 | ret = 0; | |
8812 | goto out; | |
8813 | } | |
8814 | ||
8815 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8816 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8817 | ||
8818 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
8819 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + | |
8820 | min_allocable_bytes <= sinfo->total_bytes) { | |
8821 | sinfo->bytes_readonly += num_bytes; | |
8822 | cache->ro = 1; | |
8823 | list_add_tail(&cache->ro_list, &sinfo->ro_bgs); | |
8824 | ret = 0; | |
8825 | } | |
8826 | out: | |
8827 | spin_unlock(&cache->lock); | |
8828 | spin_unlock(&sinfo->lock); | |
8829 | return ret; | |
8830 | } | |
8831 | ||
8832 | int btrfs_set_block_group_ro(struct btrfs_root *root, | |
8833 | struct btrfs_block_group_cache *cache) | |
8834 | ||
8835 | { | |
8836 | struct btrfs_trans_handle *trans; | |
8837 | u64 alloc_flags; | |
8838 | int ret; | |
8839 | ||
8840 | BUG_ON(cache->ro); | |
8841 | ||
8842 | again: | |
8843 | trans = btrfs_join_transaction(root); | |
8844 | if (IS_ERR(trans)) | |
8845 | return PTR_ERR(trans); | |
8846 | ||
8847 | /* | |
8848 | * we're not allowed to set block groups readonly after the dirty | |
8849 | * block groups cache has started writing. If it already started, | |
8850 | * back off and let this transaction commit | |
8851 | */ | |
8852 | mutex_lock(&root->fs_info->ro_block_group_mutex); | |
8853 | if (trans->transaction->dirty_bg_run) { | |
8854 | u64 transid = trans->transid; | |
8855 | ||
8856 | mutex_unlock(&root->fs_info->ro_block_group_mutex); | |
8857 | btrfs_end_transaction(trans, root); | |
8858 | ||
8859 | ret = btrfs_wait_for_commit(root, transid); | |
8860 | if (ret) | |
8861 | return ret; | |
8862 | goto again; | |
8863 | } | |
8864 | ||
8865 | /* | |
8866 | * if we are changing raid levels, try to allocate a corresponding | |
8867 | * block group with the new raid level. | |
8868 | */ | |
8869 | alloc_flags = update_block_group_flags(root, cache->flags); | |
8870 | if (alloc_flags != cache->flags) { | |
8871 | ret = do_chunk_alloc(trans, root, alloc_flags, | |
8872 | CHUNK_ALLOC_FORCE); | |
8873 | /* | |
8874 | * ENOSPC is allowed here, we may have enough space | |
8875 | * already allocated at the new raid level to | |
8876 | * carry on | |
8877 | */ | |
8878 | if (ret == -ENOSPC) | |
8879 | ret = 0; | |
8880 | if (ret < 0) | |
8881 | goto out; | |
8882 | } | |
8883 | ||
8884 | ret = set_block_group_ro(cache, 0); | |
8885 | if (!ret) | |
8886 | goto out; | |
8887 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
8888 | ret = do_chunk_alloc(trans, root, alloc_flags, | |
8889 | CHUNK_ALLOC_FORCE); | |
8890 | if (ret < 0) | |
8891 | goto out; | |
8892 | ret = set_block_group_ro(cache, 0); | |
8893 | out: | |
8894 | if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { | |
8895 | alloc_flags = update_block_group_flags(root, cache->flags); | |
8896 | lock_chunks(root->fs_info->chunk_root); | |
8897 | check_system_chunk(trans, root, alloc_flags); | |
8898 | unlock_chunks(root->fs_info->chunk_root); | |
8899 | } | |
8900 | mutex_unlock(&root->fs_info->ro_block_group_mutex); | |
8901 | ||
8902 | btrfs_end_transaction(trans, root); | |
8903 | return ret; | |
8904 | } | |
8905 | ||
8906 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, | |
8907 | struct btrfs_root *root, u64 type) | |
8908 | { | |
8909 | u64 alloc_flags = get_alloc_profile(root, type); | |
8910 | return do_chunk_alloc(trans, root, alloc_flags, | |
8911 | CHUNK_ALLOC_FORCE); | |
8912 | } | |
8913 | ||
8914 | /* | |
8915 | * helper to account the unused space of all the readonly block group in the | |
8916 | * space_info. takes mirrors into account. | |
8917 | */ | |
8918 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
8919 | { | |
8920 | struct btrfs_block_group_cache *block_group; | |
8921 | u64 free_bytes = 0; | |
8922 | int factor; | |
8923 | ||
8924 | /* It's df, we don't care if it's racey */ | |
8925 | if (list_empty(&sinfo->ro_bgs)) | |
8926 | return 0; | |
8927 | ||
8928 | spin_lock(&sinfo->lock); | |
8929 | list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { | |
8930 | spin_lock(&block_group->lock); | |
8931 | ||
8932 | if (!block_group->ro) { | |
8933 | spin_unlock(&block_group->lock); | |
8934 | continue; | |
8935 | } | |
8936 | ||
8937 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
8938 | BTRFS_BLOCK_GROUP_RAID10 | | |
8939 | BTRFS_BLOCK_GROUP_DUP)) | |
8940 | factor = 2; | |
8941 | else | |
8942 | factor = 1; | |
8943 | ||
8944 | free_bytes += (block_group->key.offset - | |
8945 | btrfs_block_group_used(&block_group->item)) * | |
8946 | factor; | |
8947 | ||
8948 | spin_unlock(&block_group->lock); | |
8949 | } | |
8950 | spin_unlock(&sinfo->lock); | |
8951 | ||
8952 | return free_bytes; | |
8953 | } | |
8954 | ||
8955 | void btrfs_set_block_group_rw(struct btrfs_root *root, | |
8956 | struct btrfs_block_group_cache *cache) | |
8957 | { | |
8958 | struct btrfs_space_info *sinfo = cache->space_info; | |
8959 | u64 num_bytes; | |
8960 | ||
8961 | BUG_ON(!cache->ro); | |
8962 | ||
8963 | spin_lock(&sinfo->lock); | |
8964 | spin_lock(&cache->lock); | |
8965 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
8966 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
8967 | sinfo->bytes_readonly -= num_bytes; | |
8968 | cache->ro = 0; | |
8969 | list_del_init(&cache->ro_list); | |
8970 | spin_unlock(&cache->lock); | |
8971 | spin_unlock(&sinfo->lock); | |
8972 | } | |
8973 | ||
8974 | /* | |
8975 | * checks to see if its even possible to relocate this block group. | |
8976 | * | |
8977 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
8978 | * ok to go ahead and try. | |
8979 | */ | |
8980 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
8981 | { | |
8982 | struct btrfs_block_group_cache *block_group; | |
8983 | struct btrfs_space_info *space_info; | |
8984 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
8985 | struct btrfs_device *device; | |
8986 | struct btrfs_trans_handle *trans; | |
8987 | u64 min_free; | |
8988 | u64 dev_min = 1; | |
8989 | u64 dev_nr = 0; | |
8990 | u64 target; | |
8991 | int index; | |
8992 | int full = 0; | |
8993 | int ret = 0; | |
8994 | ||
8995 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
8996 | ||
8997 | /* odd, couldn't find the block group, leave it alone */ | |
8998 | if (!block_group) | |
8999 | return -1; | |
9000 | ||
9001 | min_free = btrfs_block_group_used(&block_group->item); | |
9002 | ||
9003 | /* no bytes used, we're good */ | |
9004 | if (!min_free) | |
9005 | goto out; | |
9006 | ||
9007 | space_info = block_group->space_info; | |
9008 | spin_lock(&space_info->lock); | |
9009 | ||
9010 | full = space_info->full; | |
9011 | ||
9012 | /* | |
9013 | * if this is the last block group we have in this space, we can't | |
9014 | * relocate it unless we're able to allocate a new chunk below. | |
9015 | * | |
9016 | * Otherwise, we need to make sure we have room in the space to handle | |
9017 | * all of the extents from this block group. If we can, we're good | |
9018 | */ | |
9019 | if ((space_info->total_bytes != block_group->key.offset) && | |
9020 | (space_info->bytes_used + space_info->bytes_reserved + | |
9021 | space_info->bytes_pinned + space_info->bytes_readonly + | |
9022 | min_free < space_info->total_bytes)) { | |
9023 | spin_unlock(&space_info->lock); | |
9024 | goto out; | |
9025 | } | |
9026 | spin_unlock(&space_info->lock); | |
9027 | ||
9028 | /* | |
9029 | * ok we don't have enough space, but maybe we have free space on our | |
9030 | * devices to allocate new chunks for relocation, so loop through our | |
9031 | * alloc devices and guess if we have enough space. if this block | |
9032 | * group is going to be restriped, run checks against the target | |
9033 | * profile instead of the current one. | |
9034 | */ | |
9035 | ret = -1; | |
9036 | ||
9037 | /* | |
9038 | * index: | |
9039 | * 0: raid10 | |
9040 | * 1: raid1 | |
9041 | * 2: dup | |
9042 | * 3: raid0 | |
9043 | * 4: single | |
9044 | */ | |
9045 | target = get_restripe_target(root->fs_info, block_group->flags); | |
9046 | if (target) { | |
9047 | index = __get_raid_index(extended_to_chunk(target)); | |
9048 | } else { | |
9049 | /* | |
9050 | * this is just a balance, so if we were marked as full | |
9051 | * we know there is no space for a new chunk | |
9052 | */ | |
9053 | if (full) | |
9054 | goto out; | |
9055 | ||
9056 | index = get_block_group_index(block_group); | |
9057 | } | |
9058 | ||
9059 | if (index == BTRFS_RAID_RAID10) { | |
9060 | dev_min = 4; | |
9061 | /* Divide by 2 */ | |
9062 | min_free >>= 1; | |
9063 | } else if (index == BTRFS_RAID_RAID1) { | |
9064 | dev_min = 2; | |
9065 | } else if (index == BTRFS_RAID_DUP) { | |
9066 | /* Multiply by 2 */ | |
9067 | min_free <<= 1; | |
9068 | } else if (index == BTRFS_RAID_RAID0) { | |
9069 | dev_min = fs_devices->rw_devices; | |
9070 | min_free = div64_u64(min_free, dev_min); | |
9071 | } | |
9072 | ||
9073 | /* We need to do this so that we can look at pending chunks */ | |
9074 | trans = btrfs_join_transaction(root); | |
9075 | if (IS_ERR(trans)) { | |
9076 | ret = PTR_ERR(trans); | |
9077 | goto out; | |
9078 | } | |
9079 | ||
9080 | mutex_lock(&root->fs_info->chunk_mutex); | |
9081 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
9082 | u64 dev_offset; | |
9083 | ||
9084 | /* | |
9085 | * check to make sure we can actually find a chunk with enough | |
9086 | * space to fit our block group in. | |
9087 | */ | |
9088 | if (device->total_bytes > device->bytes_used + min_free && | |
9089 | !device->is_tgtdev_for_dev_replace) { | |
9090 | ret = find_free_dev_extent(trans, device, min_free, | |
9091 | &dev_offset, NULL); | |
9092 | if (!ret) | |
9093 | dev_nr++; | |
9094 | ||
9095 | if (dev_nr >= dev_min) | |
9096 | break; | |
9097 | ||
9098 | ret = -1; | |
9099 | } | |
9100 | } | |
9101 | mutex_unlock(&root->fs_info->chunk_mutex); | |
9102 | btrfs_end_transaction(trans, root); | |
9103 | out: | |
9104 | btrfs_put_block_group(block_group); | |
9105 | return ret; | |
9106 | } | |
9107 | ||
9108 | static int find_first_block_group(struct btrfs_root *root, | |
9109 | struct btrfs_path *path, struct btrfs_key *key) | |
9110 | { | |
9111 | int ret = 0; | |
9112 | struct btrfs_key found_key; | |
9113 | struct extent_buffer *leaf; | |
9114 | int slot; | |
9115 | ||
9116 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
9117 | if (ret < 0) | |
9118 | goto out; | |
9119 | ||
9120 | while (1) { | |
9121 | slot = path->slots[0]; | |
9122 | leaf = path->nodes[0]; | |
9123 | if (slot >= btrfs_header_nritems(leaf)) { | |
9124 | ret = btrfs_next_leaf(root, path); | |
9125 | if (ret == 0) | |
9126 | continue; | |
9127 | if (ret < 0) | |
9128 | goto out; | |
9129 | break; | |
9130 | } | |
9131 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
9132 | ||
9133 | if (found_key.objectid >= key->objectid && | |
9134 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { | |
9135 | ret = 0; | |
9136 | goto out; | |
9137 | } | |
9138 | path->slots[0]++; | |
9139 | } | |
9140 | out: | |
9141 | return ret; | |
9142 | } | |
9143 | ||
9144 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) | |
9145 | { | |
9146 | struct btrfs_block_group_cache *block_group; | |
9147 | u64 last = 0; | |
9148 | ||
9149 | while (1) { | |
9150 | struct inode *inode; | |
9151 | ||
9152 | block_group = btrfs_lookup_first_block_group(info, last); | |
9153 | while (block_group) { | |
9154 | spin_lock(&block_group->lock); | |
9155 | if (block_group->iref) | |
9156 | break; | |
9157 | spin_unlock(&block_group->lock); | |
9158 | block_group = next_block_group(info->tree_root, | |
9159 | block_group); | |
9160 | } | |
9161 | if (!block_group) { | |
9162 | if (last == 0) | |
9163 | break; | |
9164 | last = 0; | |
9165 | continue; | |
9166 | } | |
9167 | ||
9168 | inode = block_group->inode; | |
9169 | block_group->iref = 0; | |
9170 | block_group->inode = NULL; | |
9171 | spin_unlock(&block_group->lock); | |
9172 | iput(inode); | |
9173 | last = block_group->key.objectid + block_group->key.offset; | |
9174 | btrfs_put_block_group(block_group); | |
9175 | } | |
9176 | } | |
9177 | ||
9178 | int btrfs_free_block_groups(struct btrfs_fs_info *info) | |
9179 | { | |
9180 | struct btrfs_block_group_cache *block_group; | |
9181 | struct btrfs_space_info *space_info; | |
9182 | struct btrfs_caching_control *caching_ctl; | |
9183 | struct rb_node *n; | |
9184 | ||
9185 | down_write(&info->commit_root_sem); | |
9186 | while (!list_empty(&info->caching_block_groups)) { | |
9187 | caching_ctl = list_entry(info->caching_block_groups.next, | |
9188 | struct btrfs_caching_control, list); | |
9189 | list_del(&caching_ctl->list); | |
9190 | put_caching_control(caching_ctl); | |
9191 | } | |
9192 | up_write(&info->commit_root_sem); | |
9193 | ||
9194 | spin_lock(&info->unused_bgs_lock); | |
9195 | while (!list_empty(&info->unused_bgs)) { | |
9196 | block_group = list_first_entry(&info->unused_bgs, | |
9197 | struct btrfs_block_group_cache, | |
9198 | bg_list); | |
9199 | list_del_init(&block_group->bg_list); | |
9200 | btrfs_put_block_group(block_group); | |
9201 | } | |
9202 | spin_unlock(&info->unused_bgs_lock); | |
9203 | ||
9204 | spin_lock(&info->block_group_cache_lock); | |
9205 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
9206 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
9207 | cache_node); | |
9208 | rb_erase(&block_group->cache_node, | |
9209 | &info->block_group_cache_tree); | |
9210 | RB_CLEAR_NODE(&block_group->cache_node); | |
9211 | spin_unlock(&info->block_group_cache_lock); | |
9212 | ||
9213 | down_write(&block_group->space_info->groups_sem); | |
9214 | list_del(&block_group->list); | |
9215 | up_write(&block_group->space_info->groups_sem); | |
9216 | ||
9217 | if (block_group->cached == BTRFS_CACHE_STARTED) | |
9218 | wait_block_group_cache_done(block_group); | |
9219 | ||
9220 | /* | |
9221 | * We haven't cached this block group, which means we could | |
9222 | * possibly have excluded extents on this block group. | |
9223 | */ | |
9224 | if (block_group->cached == BTRFS_CACHE_NO || | |
9225 | block_group->cached == BTRFS_CACHE_ERROR) | |
9226 | free_excluded_extents(info->extent_root, block_group); | |
9227 | ||
9228 | btrfs_remove_free_space_cache(block_group); | |
9229 | btrfs_put_block_group(block_group); | |
9230 | ||
9231 | spin_lock(&info->block_group_cache_lock); | |
9232 | } | |
9233 | spin_unlock(&info->block_group_cache_lock); | |
9234 | ||
9235 | /* now that all the block groups are freed, go through and | |
9236 | * free all the space_info structs. This is only called during | |
9237 | * the final stages of unmount, and so we know nobody is | |
9238 | * using them. We call synchronize_rcu() once before we start, | |
9239 | * just to be on the safe side. | |
9240 | */ | |
9241 | synchronize_rcu(); | |
9242 | ||
9243 | release_global_block_rsv(info); | |
9244 | ||
9245 | while (!list_empty(&info->space_info)) { | |
9246 | int i; | |
9247 | ||
9248 | space_info = list_entry(info->space_info.next, | |
9249 | struct btrfs_space_info, | |
9250 | list); | |
9251 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { | |
9252 | if (WARN_ON(space_info->bytes_pinned > 0 || | |
9253 | space_info->bytes_reserved > 0 || | |
9254 | space_info->bytes_may_use > 0)) { | |
9255 | dump_space_info(space_info, 0, 0); | |
9256 | } | |
9257 | } | |
9258 | list_del(&space_info->list); | |
9259 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
9260 | struct kobject *kobj; | |
9261 | kobj = space_info->block_group_kobjs[i]; | |
9262 | space_info->block_group_kobjs[i] = NULL; | |
9263 | if (kobj) { | |
9264 | kobject_del(kobj); | |
9265 | kobject_put(kobj); | |
9266 | } | |
9267 | } | |
9268 | kobject_del(&space_info->kobj); | |
9269 | kobject_put(&space_info->kobj); | |
9270 | } | |
9271 | return 0; | |
9272 | } | |
9273 | ||
9274 | static void __link_block_group(struct btrfs_space_info *space_info, | |
9275 | struct btrfs_block_group_cache *cache) | |
9276 | { | |
9277 | int index = get_block_group_index(cache); | |
9278 | bool first = false; | |
9279 | ||
9280 | down_write(&space_info->groups_sem); | |
9281 | if (list_empty(&space_info->block_groups[index])) | |
9282 | first = true; | |
9283 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
9284 | up_write(&space_info->groups_sem); | |
9285 | ||
9286 | if (first) { | |
9287 | struct raid_kobject *rkobj; | |
9288 | int ret; | |
9289 | ||
9290 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); | |
9291 | if (!rkobj) | |
9292 | goto out_err; | |
9293 | rkobj->raid_type = index; | |
9294 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
9295 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, | |
9296 | "%s", get_raid_name(index)); | |
9297 | if (ret) { | |
9298 | kobject_put(&rkobj->kobj); | |
9299 | goto out_err; | |
9300 | } | |
9301 | space_info->block_group_kobjs[index] = &rkobj->kobj; | |
9302 | } | |
9303 | ||
9304 | return; | |
9305 | out_err: | |
9306 | pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n"); | |
9307 | } | |
9308 | ||
9309 | static struct btrfs_block_group_cache * | |
9310 | btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) | |
9311 | { | |
9312 | struct btrfs_block_group_cache *cache; | |
9313 | ||
9314 | cache = kzalloc(sizeof(*cache), GFP_NOFS); | |
9315 | if (!cache) | |
9316 | return NULL; | |
9317 | ||
9318 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), | |
9319 | GFP_NOFS); | |
9320 | if (!cache->free_space_ctl) { | |
9321 | kfree(cache); | |
9322 | return NULL; | |
9323 | } | |
9324 | ||
9325 | cache->key.objectid = start; | |
9326 | cache->key.offset = size; | |
9327 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
9328 | ||
9329 | cache->sectorsize = root->sectorsize; | |
9330 | cache->fs_info = root->fs_info; | |
9331 | cache->full_stripe_len = btrfs_full_stripe_len(root, | |
9332 | &root->fs_info->mapping_tree, | |
9333 | start); | |
9334 | atomic_set(&cache->count, 1); | |
9335 | spin_lock_init(&cache->lock); | |
9336 | init_rwsem(&cache->data_rwsem); | |
9337 | INIT_LIST_HEAD(&cache->list); | |
9338 | INIT_LIST_HEAD(&cache->cluster_list); | |
9339 | INIT_LIST_HEAD(&cache->bg_list); | |
9340 | INIT_LIST_HEAD(&cache->ro_list); | |
9341 | INIT_LIST_HEAD(&cache->dirty_list); | |
9342 | INIT_LIST_HEAD(&cache->io_list); | |
9343 | btrfs_init_free_space_ctl(cache); | |
9344 | atomic_set(&cache->trimming, 0); | |
9345 | ||
9346 | return cache; | |
9347 | } | |
9348 | ||
9349 | int btrfs_read_block_groups(struct btrfs_root *root) | |
9350 | { | |
9351 | struct btrfs_path *path; | |
9352 | int ret; | |
9353 | struct btrfs_block_group_cache *cache; | |
9354 | struct btrfs_fs_info *info = root->fs_info; | |
9355 | struct btrfs_space_info *space_info; | |
9356 | struct btrfs_key key; | |
9357 | struct btrfs_key found_key; | |
9358 | struct extent_buffer *leaf; | |
9359 | int need_clear = 0; | |
9360 | u64 cache_gen; | |
9361 | ||
9362 | root = info->extent_root; | |
9363 | key.objectid = 0; | |
9364 | key.offset = 0; | |
9365 | key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
9366 | path = btrfs_alloc_path(); | |
9367 | if (!path) | |
9368 | return -ENOMEM; | |
9369 | path->reada = 1; | |
9370 | ||
9371 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); | |
9372 | if (btrfs_test_opt(root, SPACE_CACHE) && | |
9373 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) | |
9374 | need_clear = 1; | |
9375 | if (btrfs_test_opt(root, CLEAR_CACHE)) | |
9376 | need_clear = 1; | |
9377 | ||
9378 | while (1) { | |
9379 | ret = find_first_block_group(root, path, &key); | |
9380 | if (ret > 0) | |
9381 | break; | |
9382 | if (ret != 0) | |
9383 | goto error; | |
9384 | ||
9385 | leaf = path->nodes[0]; | |
9386 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
9387 | ||
9388 | cache = btrfs_create_block_group_cache(root, found_key.objectid, | |
9389 | found_key.offset); | |
9390 | if (!cache) { | |
9391 | ret = -ENOMEM; | |
9392 | goto error; | |
9393 | } | |
9394 | ||
9395 | if (need_clear) { | |
9396 | /* | |
9397 | * When we mount with old space cache, we need to | |
9398 | * set BTRFS_DC_CLEAR and set dirty flag. | |
9399 | * | |
9400 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
9401 | * truncate the old free space cache inode and | |
9402 | * setup a new one. | |
9403 | * b) Setting 'dirty flag' makes sure that we flush | |
9404 | * the new space cache info onto disk. | |
9405 | */ | |
9406 | if (btrfs_test_opt(root, SPACE_CACHE)) | |
9407 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
9408 | } | |
9409 | ||
9410 | read_extent_buffer(leaf, &cache->item, | |
9411 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
9412 | sizeof(cache->item)); | |
9413 | cache->flags = btrfs_block_group_flags(&cache->item); | |
9414 | ||
9415 | key.objectid = found_key.objectid + found_key.offset; | |
9416 | btrfs_release_path(path); | |
9417 | ||
9418 | /* | |
9419 | * We need to exclude the super stripes now so that the space | |
9420 | * info has super bytes accounted for, otherwise we'll think | |
9421 | * we have more space than we actually do. | |
9422 | */ | |
9423 | ret = exclude_super_stripes(root, cache); | |
9424 | if (ret) { | |
9425 | /* | |
9426 | * We may have excluded something, so call this just in | |
9427 | * case. | |
9428 | */ | |
9429 | free_excluded_extents(root, cache); | |
9430 | btrfs_put_block_group(cache); | |
9431 | goto error; | |
9432 | } | |
9433 | ||
9434 | /* | |
9435 | * check for two cases, either we are full, and therefore | |
9436 | * don't need to bother with the caching work since we won't | |
9437 | * find any space, or we are empty, and we can just add all | |
9438 | * the space in and be done with it. This saves us _alot_ of | |
9439 | * time, particularly in the full case. | |
9440 | */ | |
9441 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
9442 | cache->last_byte_to_unpin = (u64)-1; | |
9443 | cache->cached = BTRFS_CACHE_FINISHED; | |
9444 | free_excluded_extents(root, cache); | |
9445 | } else if (btrfs_block_group_used(&cache->item) == 0) { | |
9446 | cache->last_byte_to_unpin = (u64)-1; | |
9447 | cache->cached = BTRFS_CACHE_FINISHED; | |
9448 | add_new_free_space(cache, root->fs_info, | |
9449 | found_key.objectid, | |
9450 | found_key.objectid + | |
9451 | found_key.offset); | |
9452 | free_excluded_extents(root, cache); | |
9453 | } | |
9454 | ||
9455 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
9456 | if (ret) { | |
9457 | btrfs_remove_free_space_cache(cache); | |
9458 | btrfs_put_block_group(cache); | |
9459 | goto error; | |
9460 | } | |
9461 | ||
9462 | ret = update_space_info(info, cache->flags, found_key.offset, | |
9463 | btrfs_block_group_used(&cache->item), | |
9464 | &space_info); | |
9465 | if (ret) { | |
9466 | btrfs_remove_free_space_cache(cache); | |
9467 | spin_lock(&info->block_group_cache_lock); | |
9468 | rb_erase(&cache->cache_node, | |
9469 | &info->block_group_cache_tree); | |
9470 | RB_CLEAR_NODE(&cache->cache_node); | |
9471 | spin_unlock(&info->block_group_cache_lock); | |
9472 | btrfs_put_block_group(cache); | |
9473 | goto error; | |
9474 | } | |
9475 | ||
9476 | cache->space_info = space_info; | |
9477 | spin_lock(&cache->space_info->lock); | |
9478 | cache->space_info->bytes_readonly += cache->bytes_super; | |
9479 | spin_unlock(&cache->space_info->lock); | |
9480 | ||
9481 | __link_block_group(space_info, cache); | |
9482 | ||
9483 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
9484 | if (btrfs_chunk_readonly(root, cache->key.objectid)) { | |
9485 | set_block_group_ro(cache, 1); | |
9486 | } else if (btrfs_block_group_used(&cache->item) == 0) { | |
9487 | spin_lock(&info->unused_bgs_lock); | |
9488 | /* Should always be true but just in case. */ | |
9489 | if (list_empty(&cache->bg_list)) { | |
9490 | btrfs_get_block_group(cache); | |
9491 | list_add_tail(&cache->bg_list, | |
9492 | &info->unused_bgs); | |
9493 | } | |
9494 | spin_unlock(&info->unused_bgs_lock); | |
9495 | } | |
9496 | } | |
9497 | ||
9498 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
9499 | if (!(get_alloc_profile(root, space_info->flags) & | |
9500 | (BTRFS_BLOCK_GROUP_RAID10 | | |
9501 | BTRFS_BLOCK_GROUP_RAID1 | | |
9502 | BTRFS_BLOCK_GROUP_RAID5 | | |
9503 | BTRFS_BLOCK_GROUP_RAID6 | | |
9504 | BTRFS_BLOCK_GROUP_DUP))) | |
9505 | continue; | |
9506 | /* | |
9507 | * avoid allocating from un-mirrored block group if there are | |
9508 | * mirrored block groups. | |
9509 | */ | |
9510 | list_for_each_entry(cache, | |
9511 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
9512 | list) | |
9513 | set_block_group_ro(cache, 1); | |
9514 | list_for_each_entry(cache, | |
9515 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
9516 | list) | |
9517 | set_block_group_ro(cache, 1); | |
9518 | } | |
9519 | ||
9520 | init_global_block_rsv(info); | |
9521 | ret = 0; | |
9522 | error: | |
9523 | btrfs_free_path(path); | |
9524 | return ret; | |
9525 | } | |
9526 | ||
9527 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, | |
9528 | struct btrfs_root *root) | |
9529 | { | |
9530 | struct btrfs_block_group_cache *block_group, *tmp; | |
9531 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
9532 | struct btrfs_block_group_item item; | |
9533 | struct btrfs_key key; | |
9534 | int ret = 0; | |
9535 | ||
9536 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) { | |
9537 | if (ret) | |
9538 | goto next; | |
9539 | ||
9540 | spin_lock(&block_group->lock); | |
9541 | memcpy(&item, &block_group->item, sizeof(item)); | |
9542 | memcpy(&key, &block_group->key, sizeof(key)); | |
9543 | spin_unlock(&block_group->lock); | |
9544 | ||
9545 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
9546 | sizeof(item)); | |
9547 | if (ret) | |
9548 | btrfs_abort_transaction(trans, extent_root, ret); | |
9549 | ret = btrfs_finish_chunk_alloc(trans, extent_root, | |
9550 | key.objectid, key.offset); | |
9551 | if (ret) | |
9552 | btrfs_abort_transaction(trans, extent_root, ret); | |
9553 | next: | |
9554 | list_del_init(&block_group->bg_list); | |
9555 | } | |
9556 | } | |
9557 | ||
9558 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
9559 | struct btrfs_root *root, u64 bytes_used, | |
9560 | u64 type, u64 chunk_objectid, u64 chunk_offset, | |
9561 | u64 size) | |
9562 | { | |
9563 | int ret; | |
9564 | struct btrfs_root *extent_root; | |
9565 | struct btrfs_block_group_cache *cache; | |
9566 | ||
9567 | extent_root = root->fs_info->extent_root; | |
9568 | ||
9569 | btrfs_set_log_full_commit(root->fs_info, trans); | |
9570 | ||
9571 | cache = btrfs_create_block_group_cache(root, chunk_offset, size); | |
9572 | if (!cache) | |
9573 | return -ENOMEM; | |
9574 | ||
9575 | btrfs_set_block_group_used(&cache->item, bytes_used); | |
9576 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); | |
9577 | btrfs_set_block_group_flags(&cache->item, type); | |
9578 | ||
9579 | cache->flags = type; | |
9580 | cache->last_byte_to_unpin = (u64)-1; | |
9581 | cache->cached = BTRFS_CACHE_FINISHED; | |
9582 | ret = exclude_super_stripes(root, cache); | |
9583 | if (ret) { | |
9584 | /* | |
9585 | * We may have excluded something, so call this just in | |
9586 | * case. | |
9587 | */ | |
9588 | free_excluded_extents(root, cache); | |
9589 | btrfs_put_block_group(cache); | |
9590 | return ret; | |
9591 | } | |
9592 | ||
9593 | add_new_free_space(cache, root->fs_info, chunk_offset, | |
9594 | chunk_offset + size); | |
9595 | ||
9596 | free_excluded_extents(root, cache); | |
9597 | ||
9598 | /* | |
9599 | * Call to ensure the corresponding space_info object is created and | |
9600 | * assigned to our block group, but don't update its counters just yet. | |
9601 | * We want our bg to be added to the rbtree with its ->space_info set. | |
9602 | */ | |
9603 | ret = update_space_info(root->fs_info, cache->flags, 0, 0, | |
9604 | &cache->space_info); | |
9605 | if (ret) { | |
9606 | btrfs_remove_free_space_cache(cache); | |
9607 | btrfs_put_block_group(cache); | |
9608 | return ret; | |
9609 | } | |
9610 | ||
9611 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
9612 | if (ret) { | |
9613 | btrfs_remove_free_space_cache(cache); | |
9614 | btrfs_put_block_group(cache); | |
9615 | return ret; | |
9616 | } | |
9617 | ||
9618 | /* | |
9619 | * Now that our block group has its ->space_info set and is inserted in | |
9620 | * the rbtree, update the space info's counters. | |
9621 | */ | |
9622 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
9623 | &cache->space_info); | |
9624 | if (ret) { | |
9625 | btrfs_remove_free_space_cache(cache); | |
9626 | spin_lock(&root->fs_info->block_group_cache_lock); | |
9627 | rb_erase(&cache->cache_node, | |
9628 | &root->fs_info->block_group_cache_tree); | |
9629 | RB_CLEAR_NODE(&cache->cache_node); | |
9630 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
9631 | btrfs_put_block_group(cache); | |
9632 | return ret; | |
9633 | } | |
9634 | update_global_block_rsv(root->fs_info); | |
9635 | ||
9636 | spin_lock(&cache->space_info->lock); | |
9637 | cache->space_info->bytes_readonly += cache->bytes_super; | |
9638 | spin_unlock(&cache->space_info->lock); | |
9639 | ||
9640 | __link_block_group(cache->space_info, cache); | |
9641 | ||
9642 | list_add_tail(&cache->bg_list, &trans->new_bgs); | |
9643 | ||
9644 | set_avail_alloc_bits(extent_root->fs_info, type); | |
9645 | ||
9646 | return 0; | |
9647 | } | |
9648 | ||
9649 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) | |
9650 | { | |
9651 | u64 extra_flags = chunk_to_extended(flags) & | |
9652 | BTRFS_EXTENDED_PROFILE_MASK; | |
9653 | ||
9654 | write_seqlock(&fs_info->profiles_lock); | |
9655 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
9656 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
9657 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
9658 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
9659 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
9660 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
9661 | write_sequnlock(&fs_info->profiles_lock); | |
9662 | } | |
9663 | ||
9664 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, | |
9665 | struct btrfs_root *root, u64 group_start, | |
9666 | struct extent_map *em) | |
9667 | { | |
9668 | struct btrfs_path *path; | |
9669 | struct btrfs_block_group_cache *block_group; | |
9670 | struct btrfs_free_cluster *cluster; | |
9671 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9672 | struct btrfs_key key; | |
9673 | struct inode *inode; | |
9674 | struct kobject *kobj = NULL; | |
9675 | int ret; | |
9676 | int index; | |
9677 | int factor; | |
9678 | struct btrfs_caching_control *caching_ctl = NULL; | |
9679 | bool remove_em; | |
9680 | ||
9681 | root = root->fs_info->extent_root; | |
9682 | ||
9683 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
9684 | BUG_ON(!block_group); | |
9685 | BUG_ON(!block_group->ro); | |
9686 | ||
9687 | /* | |
9688 | * Free the reserved super bytes from this block group before | |
9689 | * remove it. | |
9690 | */ | |
9691 | free_excluded_extents(root, block_group); | |
9692 | ||
9693 | memcpy(&key, &block_group->key, sizeof(key)); | |
9694 | index = get_block_group_index(block_group); | |
9695 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | | |
9696 | BTRFS_BLOCK_GROUP_RAID1 | | |
9697 | BTRFS_BLOCK_GROUP_RAID10)) | |
9698 | factor = 2; | |
9699 | else | |
9700 | factor = 1; | |
9701 | ||
9702 | /* make sure this block group isn't part of an allocation cluster */ | |
9703 | cluster = &root->fs_info->data_alloc_cluster; | |
9704 | spin_lock(&cluster->refill_lock); | |
9705 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
9706 | spin_unlock(&cluster->refill_lock); | |
9707 | ||
9708 | /* | |
9709 | * make sure this block group isn't part of a metadata | |
9710 | * allocation cluster | |
9711 | */ | |
9712 | cluster = &root->fs_info->meta_alloc_cluster; | |
9713 | spin_lock(&cluster->refill_lock); | |
9714 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
9715 | spin_unlock(&cluster->refill_lock); | |
9716 | ||
9717 | path = btrfs_alloc_path(); | |
9718 | if (!path) { | |
9719 | ret = -ENOMEM; | |
9720 | goto out; | |
9721 | } | |
9722 | ||
9723 | /* | |
9724 | * get the inode first so any iput calls done for the io_list | |
9725 | * aren't the final iput (no unlinks allowed now) | |
9726 | */ | |
9727 | inode = lookup_free_space_inode(tree_root, block_group, path); | |
9728 | ||
9729 | mutex_lock(&trans->transaction->cache_write_mutex); | |
9730 | /* | |
9731 | * make sure our free spache cache IO is done before remove the | |
9732 | * free space inode | |
9733 | */ | |
9734 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
9735 | if (!list_empty(&block_group->io_list)) { | |
9736 | list_del_init(&block_group->io_list); | |
9737 | ||
9738 | WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); | |
9739 | ||
9740 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
9741 | btrfs_wait_cache_io(root, trans, block_group, | |
9742 | &block_group->io_ctl, path, | |
9743 | block_group->key.objectid); | |
9744 | btrfs_put_block_group(block_group); | |
9745 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
9746 | } | |
9747 | ||
9748 | if (!list_empty(&block_group->dirty_list)) { | |
9749 | list_del_init(&block_group->dirty_list); | |
9750 | btrfs_put_block_group(block_group); | |
9751 | } | |
9752 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
9753 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
9754 | ||
9755 | if (!IS_ERR(inode)) { | |
9756 | ret = btrfs_orphan_add(trans, inode); | |
9757 | if (ret) { | |
9758 | btrfs_add_delayed_iput(inode); | |
9759 | goto out; | |
9760 | } | |
9761 | clear_nlink(inode); | |
9762 | /* One for the block groups ref */ | |
9763 | spin_lock(&block_group->lock); | |
9764 | if (block_group->iref) { | |
9765 | block_group->iref = 0; | |
9766 | block_group->inode = NULL; | |
9767 | spin_unlock(&block_group->lock); | |
9768 | iput(inode); | |
9769 | } else { | |
9770 | spin_unlock(&block_group->lock); | |
9771 | } | |
9772 | /* One for our lookup ref */ | |
9773 | btrfs_add_delayed_iput(inode); | |
9774 | } | |
9775 | ||
9776 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
9777 | key.offset = block_group->key.objectid; | |
9778 | key.type = 0; | |
9779 | ||
9780 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
9781 | if (ret < 0) | |
9782 | goto out; | |
9783 | if (ret > 0) | |
9784 | btrfs_release_path(path); | |
9785 | if (ret == 0) { | |
9786 | ret = btrfs_del_item(trans, tree_root, path); | |
9787 | if (ret) | |
9788 | goto out; | |
9789 | btrfs_release_path(path); | |
9790 | } | |
9791 | ||
9792 | spin_lock(&root->fs_info->block_group_cache_lock); | |
9793 | rb_erase(&block_group->cache_node, | |
9794 | &root->fs_info->block_group_cache_tree); | |
9795 | RB_CLEAR_NODE(&block_group->cache_node); | |
9796 | ||
9797 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
9798 | root->fs_info->first_logical_byte = (u64)-1; | |
9799 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
9800 | ||
9801 | down_write(&block_group->space_info->groups_sem); | |
9802 | /* | |
9803 | * we must use list_del_init so people can check to see if they | |
9804 | * are still on the list after taking the semaphore | |
9805 | */ | |
9806 | list_del_init(&block_group->list); | |
9807 | if (list_empty(&block_group->space_info->block_groups[index])) { | |
9808 | kobj = block_group->space_info->block_group_kobjs[index]; | |
9809 | block_group->space_info->block_group_kobjs[index] = NULL; | |
9810 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
9811 | } | |
9812 | up_write(&block_group->space_info->groups_sem); | |
9813 | if (kobj) { | |
9814 | kobject_del(kobj); | |
9815 | kobject_put(kobj); | |
9816 | } | |
9817 | ||
9818 | if (block_group->has_caching_ctl) | |
9819 | caching_ctl = get_caching_control(block_group); | |
9820 | if (block_group->cached == BTRFS_CACHE_STARTED) | |
9821 | wait_block_group_cache_done(block_group); | |
9822 | if (block_group->has_caching_ctl) { | |
9823 | down_write(&root->fs_info->commit_root_sem); | |
9824 | if (!caching_ctl) { | |
9825 | struct btrfs_caching_control *ctl; | |
9826 | ||
9827 | list_for_each_entry(ctl, | |
9828 | &root->fs_info->caching_block_groups, list) | |
9829 | if (ctl->block_group == block_group) { | |
9830 | caching_ctl = ctl; | |
9831 | atomic_inc(&caching_ctl->count); | |
9832 | break; | |
9833 | } | |
9834 | } | |
9835 | if (caching_ctl) | |
9836 | list_del_init(&caching_ctl->list); | |
9837 | up_write(&root->fs_info->commit_root_sem); | |
9838 | if (caching_ctl) { | |
9839 | /* Once for the caching bgs list and once for us. */ | |
9840 | put_caching_control(caching_ctl); | |
9841 | put_caching_control(caching_ctl); | |
9842 | } | |
9843 | } | |
9844 | ||
9845 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
9846 | if (!list_empty(&block_group->dirty_list)) { | |
9847 | WARN_ON(1); | |
9848 | } | |
9849 | if (!list_empty(&block_group->io_list)) { | |
9850 | WARN_ON(1); | |
9851 | } | |
9852 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
9853 | btrfs_remove_free_space_cache(block_group); | |
9854 | ||
9855 | spin_lock(&block_group->space_info->lock); | |
9856 | list_del_init(&block_group->ro_list); | |
9857 | ||
9858 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
9859 | WARN_ON(block_group->space_info->total_bytes | |
9860 | < block_group->key.offset); | |
9861 | WARN_ON(block_group->space_info->bytes_readonly | |
9862 | < block_group->key.offset); | |
9863 | WARN_ON(block_group->space_info->disk_total | |
9864 | < block_group->key.offset * factor); | |
9865 | } | |
9866 | block_group->space_info->total_bytes -= block_group->key.offset; | |
9867 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
9868 | block_group->space_info->disk_total -= block_group->key.offset * factor; | |
9869 | ||
9870 | spin_unlock(&block_group->space_info->lock); | |
9871 | ||
9872 | memcpy(&key, &block_group->key, sizeof(key)); | |
9873 | ||
9874 | lock_chunks(root); | |
9875 | if (!list_empty(&em->list)) { | |
9876 | /* We're in the transaction->pending_chunks list. */ | |
9877 | free_extent_map(em); | |
9878 | } | |
9879 | spin_lock(&block_group->lock); | |
9880 | block_group->removed = 1; | |
9881 | /* | |
9882 | * At this point trimming can't start on this block group, because we | |
9883 | * removed the block group from the tree fs_info->block_group_cache_tree | |
9884 | * so no one can't find it anymore and even if someone already got this | |
9885 | * block group before we removed it from the rbtree, they have already | |
9886 | * incremented block_group->trimming - if they didn't, they won't find | |
9887 | * any free space entries because we already removed them all when we | |
9888 | * called btrfs_remove_free_space_cache(). | |
9889 | * | |
9890 | * And we must not remove the extent map from the fs_info->mapping_tree | |
9891 | * to prevent the same logical address range and physical device space | |
9892 | * ranges from being reused for a new block group. This is because our | |
9893 | * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is | |
9894 | * completely transactionless, so while it is trimming a range the | |
9895 | * currently running transaction might finish and a new one start, | |
9896 | * allowing for new block groups to be created that can reuse the same | |
9897 | * physical device locations unless we take this special care. | |
9898 | */ | |
9899 | remove_em = (atomic_read(&block_group->trimming) == 0); | |
9900 | /* | |
9901 | * Make sure a trimmer task always sees the em in the pinned_chunks list | |
9902 | * if it sees block_group->removed == 1 (needs to lock block_group->lock | |
9903 | * before checking block_group->removed). | |
9904 | */ | |
9905 | if (!remove_em) { | |
9906 | /* | |
9907 | * Our em might be in trans->transaction->pending_chunks which | |
9908 | * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks), | |
9909 | * and so is the fs_info->pinned_chunks list. | |
9910 | * | |
9911 | * So at this point we must be holding the chunk_mutex to avoid | |
9912 | * any races with chunk allocation (more specifically at | |
9913 | * volumes.c:contains_pending_extent()), to ensure it always | |
9914 | * sees the em, either in the pending_chunks list or in the | |
9915 | * pinned_chunks list. | |
9916 | */ | |
9917 | list_move_tail(&em->list, &root->fs_info->pinned_chunks); | |
9918 | } | |
9919 | spin_unlock(&block_group->lock); | |
9920 | ||
9921 | if (remove_em) { | |
9922 | struct extent_map_tree *em_tree; | |
9923 | ||
9924 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
9925 | write_lock(&em_tree->lock); | |
9926 | /* | |
9927 | * The em might be in the pending_chunks list, so make sure the | |
9928 | * chunk mutex is locked, since remove_extent_mapping() will | |
9929 | * delete us from that list. | |
9930 | */ | |
9931 | remove_extent_mapping(em_tree, em); | |
9932 | write_unlock(&em_tree->lock); | |
9933 | /* once for the tree */ | |
9934 | free_extent_map(em); | |
9935 | } | |
9936 | ||
9937 | unlock_chunks(root); | |
9938 | ||
9939 | btrfs_put_block_group(block_group); | |
9940 | btrfs_put_block_group(block_group); | |
9941 | ||
9942 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
9943 | if (ret > 0) | |
9944 | ret = -EIO; | |
9945 | if (ret < 0) | |
9946 | goto out; | |
9947 | ||
9948 | ret = btrfs_del_item(trans, root, path); | |
9949 | out: | |
9950 | btrfs_free_path(path); | |
9951 | return ret; | |
9952 | } | |
9953 | ||
9954 | /* | |
9955 | * Process the unused_bgs list and remove any that don't have any allocated | |
9956 | * space inside of them. | |
9957 | */ | |
9958 | void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) | |
9959 | { | |
9960 | struct btrfs_block_group_cache *block_group; | |
9961 | struct btrfs_space_info *space_info; | |
9962 | struct btrfs_root *root = fs_info->extent_root; | |
9963 | struct btrfs_trans_handle *trans; | |
9964 | int ret = 0; | |
9965 | ||
9966 | if (!fs_info->open) | |
9967 | return; | |
9968 | ||
9969 | spin_lock(&fs_info->unused_bgs_lock); | |
9970 | while (!list_empty(&fs_info->unused_bgs)) { | |
9971 | u64 start, end; | |
9972 | ||
9973 | block_group = list_first_entry(&fs_info->unused_bgs, | |
9974 | struct btrfs_block_group_cache, | |
9975 | bg_list); | |
9976 | space_info = block_group->space_info; | |
9977 | list_del_init(&block_group->bg_list); | |
9978 | if (ret || btrfs_mixed_space_info(space_info)) { | |
9979 | btrfs_put_block_group(block_group); | |
9980 | continue; | |
9981 | } | |
9982 | spin_unlock(&fs_info->unused_bgs_lock); | |
9983 | ||
9984 | /* Don't want to race with allocators so take the groups_sem */ | |
9985 | down_write(&space_info->groups_sem); | |
9986 | spin_lock(&block_group->lock); | |
9987 | if (block_group->reserved || | |
9988 | btrfs_block_group_used(&block_group->item) || | |
9989 | block_group->ro) { | |
9990 | /* | |
9991 | * We want to bail if we made new allocations or have | |
9992 | * outstanding allocations in this block group. We do | |
9993 | * the ro check in case balance is currently acting on | |
9994 | * this block group. | |
9995 | */ | |
9996 | spin_unlock(&block_group->lock); | |
9997 | up_write(&space_info->groups_sem); | |
9998 | goto next; | |
9999 | } | |
10000 | spin_unlock(&block_group->lock); | |
10001 | ||
10002 | /* We don't want to force the issue, only flip if it's ok. */ | |
10003 | ret = set_block_group_ro(block_group, 0); | |
10004 | up_write(&space_info->groups_sem); | |
10005 | if (ret < 0) { | |
10006 | ret = 0; | |
10007 | goto next; | |
10008 | } | |
10009 | ||
10010 | /* | |
10011 | * Want to do this before we do anything else so we can recover | |
10012 | * properly if we fail to join the transaction. | |
10013 | */ | |
10014 | /* 1 for btrfs_orphan_reserve_metadata() */ | |
10015 | trans = btrfs_start_transaction(root, 1); | |
10016 | if (IS_ERR(trans)) { | |
10017 | btrfs_set_block_group_rw(root, block_group); | |
10018 | ret = PTR_ERR(trans); | |
10019 | goto next; | |
10020 | } | |
10021 | ||
10022 | /* | |
10023 | * We could have pending pinned extents for this block group, | |
10024 | * just delete them, we don't care about them anymore. | |
10025 | */ | |
10026 | start = block_group->key.objectid; | |
10027 | end = start + block_group->key.offset - 1; | |
10028 | /* | |
10029 | * Hold the unused_bg_unpin_mutex lock to avoid racing with | |
10030 | * btrfs_finish_extent_commit(). If we are at transaction N, | |
10031 | * another task might be running finish_extent_commit() for the | |
10032 | * previous transaction N - 1, and have seen a range belonging | |
10033 | * to the block group in freed_extents[] before we were able to | |
10034 | * clear the whole block group range from freed_extents[]. This | |
10035 | * means that task can lookup for the block group after we | |
10036 | * unpinned it from freed_extents[] and removed it, leading to | |
10037 | * a BUG_ON() at btrfs_unpin_extent_range(). | |
10038 | */ | |
10039 | mutex_lock(&fs_info->unused_bg_unpin_mutex); | |
10040 | ret = clear_extent_bits(&fs_info->freed_extents[0], start, end, | |
10041 | EXTENT_DIRTY, GFP_NOFS); | |
10042 | if (ret) { | |
10043 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
10044 | btrfs_set_block_group_rw(root, block_group); | |
10045 | goto end_trans; | |
10046 | } | |
10047 | ret = clear_extent_bits(&fs_info->freed_extents[1], start, end, | |
10048 | EXTENT_DIRTY, GFP_NOFS); | |
10049 | if (ret) { | |
10050 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
10051 | btrfs_set_block_group_rw(root, block_group); | |
10052 | goto end_trans; | |
10053 | } | |
10054 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
10055 | ||
10056 | /* Reset pinned so btrfs_put_block_group doesn't complain */ | |
10057 | spin_lock(&space_info->lock); | |
10058 | spin_lock(&block_group->lock); | |
10059 | ||
10060 | space_info->bytes_pinned -= block_group->pinned; | |
10061 | space_info->bytes_readonly += block_group->pinned; | |
10062 | percpu_counter_add(&space_info->total_bytes_pinned, | |
10063 | -block_group->pinned); | |
10064 | block_group->pinned = 0; | |
10065 | ||
10066 | spin_unlock(&block_group->lock); | |
10067 | spin_unlock(&space_info->lock); | |
10068 | ||
10069 | /* | |
10070 | * Btrfs_remove_chunk will abort the transaction if things go | |
10071 | * horribly wrong. | |
10072 | */ | |
10073 | ret = btrfs_remove_chunk(trans, root, | |
10074 | block_group->key.objectid); | |
10075 | end_trans: | |
10076 | btrfs_end_transaction(trans, root); | |
10077 | next: | |
10078 | btrfs_put_block_group(block_group); | |
10079 | spin_lock(&fs_info->unused_bgs_lock); | |
10080 | } | |
10081 | spin_unlock(&fs_info->unused_bgs_lock); | |
10082 | } | |
10083 | ||
10084 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) | |
10085 | { | |
10086 | struct btrfs_space_info *space_info; | |
10087 | struct btrfs_super_block *disk_super; | |
10088 | u64 features; | |
10089 | u64 flags; | |
10090 | int mixed = 0; | |
10091 | int ret; | |
10092 | ||
10093 | disk_super = fs_info->super_copy; | |
10094 | if (!btrfs_super_root(disk_super)) | |
10095 | return 1; | |
10096 | ||
10097 | features = btrfs_super_incompat_flags(disk_super); | |
10098 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
10099 | mixed = 1; | |
10100 | ||
10101 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
10102 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10103 | if (ret) | |
10104 | goto out; | |
10105 | ||
10106 | if (mixed) { | |
10107 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
10108 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10109 | } else { | |
10110 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
10111 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10112 | if (ret) | |
10113 | goto out; | |
10114 | ||
10115 | flags = BTRFS_BLOCK_GROUP_DATA; | |
10116 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
10117 | } | |
10118 | out: | |
10119 | return ret; | |
10120 | } | |
10121 | ||
10122 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) | |
10123 | { | |
10124 | return unpin_extent_range(root, start, end, false); | |
10125 | } | |
10126 | ||
10127 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
10128 | { | |
10129 | struct btrfs_fs_info *fs_info = root->fs_info; | |
10130 | struct btrfs_block_group_cache *cache = NULL; | |
10131 | u64 group_trimmed; | |
10132 | u64 start; | |
10133 | u64 end; | |
10134 | u64 trimmed = 0; | |
10135 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); | |
10136 | int ret = 0; | |
10137 | ||
10138 | /* | |
10139 | * try to trim all FS space, our block group may start from non-zero. | |
10140 | */ | |
10141 | if (range->len == total_bytes) | |
10142 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
10143 | else | |
10144 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
10145 | ||
10146 | while (cache) { | |
10147 | if (cache->key.objectid >= (range->start + range->len)) { | |
10148 | btrfs_put_block_group(cache); | |
10149 | break; | |
10150 | } | |
10151 | ||
10152 | start = max(range->start, cache->key.objectid); | |
10153 | end = min(range->start + range->len, | |
10154 | cache->key.objectid + cache->key.offset); | |
10155 | ||
10156 | if (end - start >= range->minlen) { | |
10157 | if (!block_group_cache_done(cache)) { | |
10158 | ret = cache_block_group(cache, 0); | |
10159 | if (ret) { | |
10160 | btrfs_put_block_group(cache); | |
10161 | break; | |
10162 | } | |
10163 | ret = wait_block_group_cache_done(cache); | |
10164 | if (ret) { | |
10165 | btrfs_put_block_group(cache); | |
10166 | break; | |
10167 | } | |
10168 | } | |
10169 | ret = btrfs_trim_block_group(cache, | |
10170 | &group_trimmed, | |
10171 | start, | |
10172 | end, | |
10173 | range->minlen); | |
10174 | ||
10175 | trimmed += group_trimmed; | |
10176 | if (ret) { | |
10177 | btrfs_put_block_group(cache); | |
10178 | break; | |
10179 | } | |
10180 | } | |
10181 | ||
10182 | cache = next_block_group(fs_info->tree_root, cache); | |
10183 | } | |
10184 | ||
10185 | range->len = trimmed; | |
10186 | return ret; | |
10187 | } | |
10188 | ||
10189 | /* | |
10190 | * btrfs_{start,end}_write_no_snapshoting() are similar to | |
10191 | * mnt_{want,drop}_write(), they are used to prevent some tasks from writing | |
10192 | * data into the page cache through nocow before the subvolume is snapshoted, | |
10193 | * but flush the data into disk after the snapshot creation, or to prevent | |
10194 | * operations while snapshoting is ongoing and that cause the snapshot to be | |
10195 | * inconsistent (writes followed by expanding truncates for example). | |
10196 | */ | |
10197 | void btrfs_end_write_no_snapshoting(struct btrfs_root *root) | |
10198 | { | |
10199 | percpu_counter_dec(&root->subv_writers->counter); | |
10200 | /* | |
10201 | * Make sure counter is updated before we wake up | |
10202 | * waiters. | |
10203 | */ | |
10204 | smp_mb(); | |
10205 | if (waitqueue_active(&root->subv_writers->wait)) | |
10206 | wake_up(&root->subv_writers->wait); | |
10207 | } | |
10208 | ||
10209 | int btrfs_start_write_no_snapshoting(struct btrfs_root *root) | |
10210 | { | |
10211 | if (atomic_read(&root->will_be_snapshoted)) | |
10212 | return 0; | |
10213 | ||
10214 | percpu_counter_inc(&root->subv_writers->counter); | |
10215 | /* | |
10216 | * Make sure counter is updated before we check for snapshot creation. | |
10217 | */ | |
10218 | smp_mb(); | |
10219 | if (atomic_read(&root->will_be_snapshoted)) { | |
10220 | btrfs_end_write_no_snapshoting(root); | |
10221 | return 0; | |
10222 | } | |
10223 | return 1; | |
10224 | } |