Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
21af804c | 21 | #include <linux/blkdev.h> |
b7a9f29f | 22 | #include <linux/sort.h> |
4184ea7f | 23 | #include <linux/rcupdate.h> |
817d52f8 | 24 | #include <linux/kthread.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
dff51cd1 | 26 | #include <linux/ratelimit.h> |
4b4e25f2 | 27 | #include "compat.h" |
74493f7a | 28 | #include "hash.h" |
fec577fb CM |
29 | #include "ctree.h" |
30 | #include "disk-io.h" | |
31 | #include "print-tree.h" | |
e089f05c | 32 | #include "transaction.h" |
0b86a832 | 33 | #include "volumes.h" |
53b381b3 | 34 | #include "raid56.h" |
925baedd | 35 | #include "locking.h" |
fa9c0d79 | 36 | #include "free-space-cache.h" |
3fed40cc | 37 | #include "math.h" |
fec577fb | 38 | |
709c0486 AJ |
39 | #undef SCRAMBLE_DELAYED_REFS |
40 | ||
9e622d6b MX |
41 | /* |
42 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
43 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
44 | * if we really need one. | |
45 | * | |
0e4f8f88 CM |
46 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
47 | * if we have very few chunks already allocated. This is | |
48 | * used as part of the clustering code to help make sure | |
49 | * we have a good pool of storage to cluster in, without | |
50 | * filling the FS with empty chunks | |
51 | * | |
9e622d6b MX |
52 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
53 | * | |
0e4f8f88 CM |
54 | */ |
55 | enum { | |
56 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
57 | CHUNK_ALLOC_LIMITED = 1, |
58 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
59 | }; |
60 | ||
fb25e914 JB |
61 | /* |
62 | * Control how reservations are dealt with. | |
63 | * | |
64 | * RESERVE_FREE - freeing a reservation. | |
65 | * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for | |
66 | * ENOSPC accounting | |
67 | * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update | |
68 | * bytes_may_use as the ENOSPC accounting is done elsewhere | |
69 | */ | |
70 | enum { | |
71 | RESERVE_FREE = 0, | |
72 | RESERVE_ALLOC = 1, | |
73 | RESERVE_ALLOC_NO_ACCOUNT = 2, | |
74 | }; | |
75 | ||
c53d613e | 76 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 77 | u64 bytenr, u64 num_bytes, int alloc); |
5d4f98a2 YZ |
78 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
79 | struct btrfs_root *root, | |
80 | u64 bytenr, u64 num_bytes, u64 parent, | |
81 | u64 root_objectid, u64 owner_objectid, | |
82 | u64 owner_offset, int refs_to_drop, | |
83 | struct btrfs_delayed_extent_op *extra_op); | |
84 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
85 | struct extent_buffer *leaf, | |
86 | struct btrfs_extent_item *ei); | |
87 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
88 | struct btrfs_root *root, | |
89 | u64 parent, u64 root_objectid, | |
90 | u64 flags, u64 owner, u64 offset, | |
91 | struct btrfs_key *ins, int ref_mod); | |
92 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
93 | struct btrfs_root *root, | |
94 | u64 parent, u64 root_objectid, | |
95 | u64 flags, struct btrfs_disk_key *key, | |
96 | int level, struct btrfs_key *ins); | |
6a63209f | 97 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 JB |
98 | struct btrfs_root *extent_root, u64 flags, |
99 | int force); | |
11833d66 YZ |
100 | static int find_next_key(struct btrfs_path *path, int level, |
101 | struct btrfs_key *key); | |
9ed74f2d JB |
102 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
103 | int dump_block_groups); | |
fb25e914 JB |
104 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
105 | u64 num_bytes, int reserve); | |
5d80366e JB |
106 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
107 | u64 num_bytes); | |
6a63209f | 108 | |
817d52f8 JB |
109 | static noinline int |
110 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
111 | { | |
112 | smp_mb(); | |
113 | return cache->cached == BTRFS_CACHE_FINISHED; | |
114 | } | |
115 | ||
0f9dd46c JB |
116 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
117 | { | |
118 | return (cache->flags & bits) == bits; | |
119 | } | |
120 | ||
62a45b60 | 121 | static void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
122 | { |
123 | atomic_inc(&cache->count); | |
124 | } | |
125 | ||
126 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
127 | { | |
f0486c68 YZ |
128 | if (atomic_dec_and_test(&cache->count)) { |
129 | WARN_ON(cache->pinned > 0); | |
130 | WARN_ON(cache->reserved > 0); | |
34d52cb6 | 131 | kfree(cache->free_space_ctl); |
11dfe35a | 132 | kfree(cache); |
f0486c68 | 133 | } |
11dfe35a JB |
134 | } |
135 | ||
0f9dd46c JB |
136 | /* |
137 | * this adds the block group to the fs_info rb tree for the block group | |
138 | * cache | |
139 | */ | |
b2950863 | 140 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
141 | struct btrfs_block_group_cache *block_group) |
142 | { | |
143 | struct rb_node **p; | |
144 | struct rb_node *parent = NULL; | |
145 | struct btrfs_block_group_cache *cache; | |
146 | ||
147 | spin_lock(&info->block_group_cache_lock); | |
148 | p = &info->block_group_cache_tree.rb_node; | |
149 | ||
150 | while (*p) { | |
151 | parent = *p; | |
152 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
153 | cache_node); | |
154 | if (block_group->key.objectid < cache->key.objectid) { | |
155 | p = &(*p)->rb_left; | |
156 | } else if (block_group->key.objectid > cache->key.objectid) { | |
157 | p = &(*p)->rb_right; | |
158 | } else { | |
159 | spin_unlock(&info->block_group_cache_lock); | |
160 | return -EEXIST; | |
161 | } | |
162 | } | |
163 | ||
164 | rb_link_node(&block_group->cache_node, parent, p); | |
165 | rb_insert_color(&block_group->cache_node, | |
166 | &info->block_group_cache_tree); | |
a1897fdd LB |
167 | |
168 | if (info->first_logical_byte > block_group->key.objectid) | |
169 | info->first_logical_byte = block_group->key.objectid; | |
170 | ||
0f9dd46c JB |
171 | spin_unlock(&info->block_group_cache_lock); |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | /* | |
177 | * This will return the block group at or after bytenr if contains is 0, else | |
178 | * it will return the block group that contains the bytenr | |
179 | */ | |
180 | static struct btrfs_block_group_cache * | |
181 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
182 | int contains) | |
183 | { | |
184 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
185 | struct rb_node *n; | |
186 | u64 end, start; | |
187 | ||
188 | spin_lock(&info->block_group_cache_lock); | |
189 | n = info->block_group_cache_tree.rb_node; | |
190 | ||
191 | while (n) { | |
192 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
193 | cache_node); | |
194 | end = cache->key.objectid + cache->key.offset - 1; | |
195 | start = cache->key.objectid; | |
196 | ||
197 | if (bytenr < start) { | |
198 | if (!contains && (!ret || start < ret->key.objectid)) | |
199 | ret = cache; | |
200 | n = n->rb_left; | |
201 | } else if (bytenr > start) { | |
202 | if (contains && bytenr <= end) { | |
203 | ret = cache; | |
204 | break; | |
205 | } | |
206 | n = n->rb_right; | |
207 | } else { | |
208 | ret = cache; | |
209 | break; | |
210 | } | |
211 | } | |
a1897fdd | 212 | if (ret) { |
11dfe35a | 213 | btrfs_get_block_group(ret); |
a1897fdd LB |
214 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
215 | info->first_logical_byte = ret->key.objectid; | |
216 | } | |
0f9dd46c JB |
217 | spin_unlock(&info->block_group_cache_lock); |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
11833d66 YZ |
222 | static int add_excluded_extent(struct btrfs_root *root, |
223 | u64 start, u64 num_bytes) | |
817d52f8 | 224 | { |
11833d66 YZ |
225 | u64 end = start + num_bytes - 1; |
226 | set_extent_bits(&root->fs_info->freed_extents[0], | |
227 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
228 | set_extent_bits(&root->fs_info->freed_extents[1], | |
229 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
230 | return 0; | |
231 | } | |
817d52f8 | 232 | |
11833d66 YZ |
233 | static void free_excluded_extents(struct btrfs_root *root, |
234 | struct btrfs_block_group_cache *cache) | |
235 | { | |
236 | u64 start, end; | |
817d52f8 | 237 | |
11833d66 YZ |
238 | start = cache->key.objectid; |
239 | end = start + cache->key.offset - 1; | |
240 | ||
241 | clear_extent_bits(&root->fs_info->freed_extents[0], | |
242 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
243 | clear_extent_bits(&root->fs_info->freed_extents[1], | |
244 | start, end, EXTENT_UPTODATE, GFP_NOFS); | |
817d52f8 JB |
245 | } |
246 | ||
11833d66 YZ |
247 | static int exclude_super_stripes(struct btrfs_root *root, |
248 | struct btrfs_block_group_cache *cache) | |
817d52f8 | 249 | { |
817d52f8 JB |
250 | u64 bytenr; |
251 | u64 *logical; | |
252 | int stripe_len; | |
253 | int i, nr, ret; | |
254 | ||
06b2331f YZ |
255 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
256 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
257 | cache->bytes_super += stripe_len; | |
258 | ret = add_excluded_extent(root, cache->key.objectid, | |
259 | stripe_len); | |
835d974f JB |
260 | if (ret) |
261 | return ret; | |
06b2331f YZ |
262 | } |
263 | ||
817d52f8 JB |
264 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
265 | bytenr = btrfs_sb_offset(i); | |
266 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, | |
267 | cache->key.objectid, bytenr, | |
268 | 0, &logical, &nr, &stripe_len); | |
835d974f JB |
269 | if (ret) |
270 | return ret; | |
11833d66 | 271 | |
817d52f8 | 272 | while (nr--) { |
1b2da372 | 273 | cache->bytes_super += stripe_len; |
11833d66 YZ |
274 | ret = add_excluded_extent(root, logical[nr], |
275 | stripe_len); | |
835d974f JB |
276 | if (ret) { |
277 | kfree(logical); | |
278 | return ret; | |
279 | } | |
817d52f8 | 280 | } |
11833d66 | 281 | |
817d52f8 JB |
282 | kfree(logical); |
283 | } | |
817d52f8 JB |
284 | return 0; |
285 | } | |
286 | ||
11833d66 YZ |
287 | static struct btrfs_caching_control * |
288 | get_caching_control(struct btrfs_block_group_cache *cache) | |
289 | { | |
290 | struct btrfs_caching_control *ctl; | |
291 | ||
292 | spin_lock(&cache->lock); | |
293 | if (cache->cached != BTRFS_CACHE_STARTED) { | |
294 | spin_unlock(&cache->lock); | |
295 | return NULL; | |
296 | } | |
297 | ||
dde5abee JB |
298 | /* We're loading it the fast way, so we don't have a caching_ctl. */ |
299 | if (!cache->caching_ctl) { | |
300 | spin_unlock(&cache->lock); | |
11833d66 YZ |
301 | return NULL; |
302 | } | |
303 | ||
304 | ctl = cache->caching_ctl; | |
305 | atomic_inc(&ctl->count); | |
306 | spin_unlock(&cache->lock); | |
307 | return ctl; | |
308 | } | |
309 | ||
310 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
311 | { | |
312 | if (atomic_dec_and_test(&ctl->count)) | |
313 | kfree(ctl); | |
314 | } | |
315 | ||
0f9dd46c JB |
316 | /* |
317 | * this is only called by cache_block_group, since we could have freed extents | |
318 | * we need to check the pinned_extents for any extents that can't be used yet | |
319 | * since their free space will be released as soon as the transaction commits. | |
320 | */ | |
817d52f8 | 321 | static u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
0f9dd46c JB |
322 | struct btrfs_fs_info *info, u64 start, u64 end) |
323 | { | |
817d52f8 | 324 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
325 | int ret; |
326 | ||
327 | while (start < end) { | |
11833d66 | 328 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 329 | &extent_start, &extent_end, |
e6138876 JB |
330 | EXTENT_DIRTY | EXTENT_UPTODATE, |
331 | NULL); | |
0f9dd46c JB |
332 | if (ret) |
333 | break; | |
334 | ||
06b2331f | 335 | if (extent_start <= start) { |
0f9dd46c JB |
336 | start = extent_end + 1; |
337 | } else if (extent_start > start && extent_start < end) { | |
338 | size = extent_start - start; | |
817d52f8 | 339 | total_added += size; |
ea6a478e JB |
340 | ret = btrfs_add_free_space(block_group, start, |
341 | size); | |
79787eaa | 342 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
343 | start = extent_end + 1; |
344 | } else { | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | if (start < end) { | |
350 | size = end - start; | |
817d52f8 | 351 | total_added += size; |
ea6a478e | 352 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 353 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
354 | } |
355 | ||
817d52f8 | 356 | return total_added; |
0f9dd46c JB |
357 | } |
358 | ||
bab39bf9 | 359 | static noinline void caching_thread(struct btrfs_work *work) |
e37c9e69 | 360 | { |
bab39bf9 JB |
361 | struct btrfs_block_group_cache *block_group; |
362 | struct btrfs_fs_info *fs_info; | |
363 | struct btrfs_caching_control *caching_ctl; | |
364 | struct btrfs_root *extent_root; | |
e37c9e69 | 365 | struct btrfs_path *path; |
5f39d397 | 366 | struct extent_buffer *leaf; |
11833d66 | 367 | struct btrfs_key key; |
817d52f8 | 368 | u64 total_found = 0; |
11833d66 YZ |
369 | u64 last = 0; |
370 | u32 nritems; | |
371 | int ret = 0; | |
f510cfec | 372 | |
bab39bf9 JB |
373 | caching_ctl = container_of(work, struct btrfs_caching_control, work); |
374 | block_group = caching_ctl->block_group; | |
375 | fs_info = block_group->fs_info; | |
376 | extent_root = fs_info->extent_root; | |
377 | ||
e37c9e69 CM |
378 | path = btrfs_alloc_path(); |
379 | if (!path) | |
bab39bf9 | 380 | goto out; |
7d7d6068 | 381 | |
817d52f8 | 382 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 383 | |
5cd57b2c | 384 | /* |
817d52f8 JB |
385 | * We don't want to deadlock with somebody trying to allocate a new |
386 | * extent for the extent root while also trying to search the extent | |
387 | * root to add free space. So we skip locking and search the commit | |
388 | * root, since its read-only | |
5cd57b2c CM |
389 | */ |
390 | path->skip_locking = 1; | |
817d52f8 | 391 | path->search_commit_root = 1; |
026fd317 | 392 | path->reada = 1; |
817d52f8 | 393 | |
e4404d6e | 394 | key.objectid = last; |
e37c9e69 | 395 | key.offset = 0; |
11833d66 | 396 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 397 | again: |
11833d66 | 398 | mutex_lock(&caching_ctl->mutex); |
013f1b12 CM |
399 | /* need to make sure the commit_root doesn't disappear */ |
400 | down_read(&fs_info->extent_commit_sem); | |
401 | ||
11833d66 | 402 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 403 | if (ret < 0) |
ef8bbdfe | 404 | goto err; |
a512bbf8 | 405 | |
11833d66 YZ |
406 | leaf = path->nodes[0]; |
407 | nritems = btrfs_header_nritems(leaf); | |
408 | ||
d397712b | 409 | while (1) { |
7841cb28 | 410 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 411 | last = (u64)-1; |
817d52f8 | 412 | break; |
f25784b3 | 413 | } |
817d52f8 | 414 | |
11833d66 YZ |
415 | if (path->slots[0] < nritems) { |
416 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
417 | } else { | |
418 | ret = find_next_key(path, 0, &key); | |
419 | if (ret) | |
e37c9e69 | 420 | break; |
817d52f8 | 421 | |
589d8ade JB |
422 | if (need_resched() || |
423 | btrfs_next_leaf(extent_root, path)) { | |
424 | caching_ctl->progress = last; | |
ff5714cc | 425 | btrfs_release_path(path); |
589d8ade JB |
426 | up_read(&fs_info->extent_commit_sem); |
427 | mutex_unlock(&caching_ctl->mutex); | |
11833d66 | 428 | cond_resched(); |
589d8ade JB |
429 | goto again; |
430 | } | |
431 | leaf = path->nodes[0]; | |
432 | nritems = btrfs_header_nritems(leaf); | |
433 | continue; | |
11833d66 | 434 | } |
817d52f8 | 435 | |
11833d66 YZ |
436 | if (key.objectid < block_group->key.objectid) { |
437 | path->slots[0]++; | |
817d52f8 | 438 | continue; |
e37c9e69 | 439 | } |
0f9dd46c | 440 | |
e37c9e69 | 441 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 442 | block_group->key.offset) |
e37c9e69 | 443 | break; |
7d7d6068 | 444 | |
11833d66 | 445 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
817d52f8 JB |
446 | total_found += add_new_free_space(block_group, |
447 | fs_info, last, | |
448 | key.objectid); | |
7d7d6068 | 449 | last = key.objectid + key.offset; |
817d52f8 | 450 | |
11833d66 YZ |
451 | if (total_found > (1024 * 1024 * 2)) { |
452 | total_found = 0; | |
453 | wake_up(&caching_ctl->wait); | |
454 | } | |
817d52f8 | 455 | } |
e37c9e69 CM |
456 | path->slots[0]++; |
457 | } | |
817d52f8 | 458 | ret = 0; |
e37c9e69 | 459 | |
817d52f8 JB |
460 | total_found += add_new_free_space(block_group, fs_info, last, |
461 | block_group->key.objectid + | |
462 | block_group->key.offset); | |
11833d66 | 463 | caching_ctl->progress = (u64)-1; |
817d52f8 JB |
464 | |
465 | spin_lock(&block_group->lock); | |
11833d66 | 466 | block_group->caching_ctl = NULL; |
817d52f8 JB |
467 | block_group->cached = BTRFS_CACHE_FINISHED; |
468 | spin_unlock(&block_group->lock); | |
0f9dd46c | 469 | |
54aa1f4d | 470 | err: |
e37c9e69 | 471 | btrfs_free_path(path); |
276e680d | 472 | up_read(&fs_info->extent_commit_sem); |
817d52f8 | 473 | |
11833d66 YZ |
474 | free_excluded_extents(extent_root, block_group); |
475 | ||
476 | mutex_unlock(&caching_ctl->mutex); | |
bab39bf9 | 477 | out: |
11833d66 YZ |
478 | wake_up(&caching_ctl->wait); |
479 | ||
480 | put_caching_control(caching_ctl); | |
11dfe35a | 481 | btrfs_put_block_group(block_group); |
817d52f8 JB |
482 | } |
483 | ||
9d66e233 | 484 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 485 | int load_cache_only) |
817d52f8 | 486 | { |
291c7d2f | 487 | DEFINE_WAIT(wait); |
11833d66 YZ |
488 | struct btrfs_fs_info *fs_info = cache->fs_info; |
489 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
490 | int ret = 0; |
491 | ||
291c7d2f | 492 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
493 | if (!caching_ctl) |
494 | return -ENOMEM; | |
291c7d2f JB |
495 | |
496 | INIT_LIST_HEAD(&caching_ctl->list); | |
497 | mutex_init(&caching_ctl->mutex); | |
498 | init_waitqueue_head(&caching_ctl->wait); | |
499 | caching_ctl->block_group = cache; | |
500 | caching_ctl->progress = cache->key.objectid; | |
501 | atomic_set(&caching_ctl->count, 1); | |
502 | caching_ctl->work.func = caching_thread; | |
503 | ||
504 | spin_lock(&cache->lock); | |
505 | /* | |
506 | * This should be a rare occasion, but this could happen I think in the | |
507 | * case where one thread starts to load the space cache info, and then | |
508 | * some other thread starts a transaction commit which tries to do an | |
509 | * allocation while the other thread is still loading the space cache | |
510 | * info. The previous loop should have kept us from choosing this block | |
511 | * group, but if we've moved to the state where we will wait on caching | |
512 | * block groups we need to first check if we're doing a fast load here, | |
513 | * so we can wait for it to finish, otherwise we could end up allocating | |
514 | * from a block group who's cache gets evicted for one reason or | |
515 | * another. | |
516 | */ | |
517 | while (cache->cached == BTRFS_CACHE_FAST) { | |
518 | struct btrfs_caching_control *ctl; | |
519 | ||
520 | ctl = cache->caching_ctl; | |
521 | atomic_inc(&ctl->count); | |
522 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); | |
523 | spin_unlock(&cache->lock); | |
524 | ||
525 | schedule(); | |
526 | ||
527 | finish_wait(&ctl->wait, &wait); | |
528 | put_caching_control(ctl); | |
529 | spin_lock(&cache->lock); | |
530 | } | |
531 | ||
532 | if (cache->cached != BTRFS_CACHE_NO) { | |
533 | spin_unlock(&cache->lock); | |
534 | kfree(caching_ctl); | |
11833d66 | 535 | return 0; |
291c7d2f JB |
536 | } |
537 | WARN_ON(cache->caching_ctl); | |
538 | cache->caching_ctl = caching_ctl; | |
539 | cache->cached = BTRFS_CACHE_FAST; | |
540 | spin_unlock(&cache->lock); | |
11833d66 | 541 | |
d53ba474 | 542 | if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) { |
9d66e233 JB |
543 | ret = load_free_space_cache(fs_info, cache); |
544 | ||
545 | spin_lock(&cache->lock); | |
546 | if (ret == 1) { | |
291c7d2f | 547 | cache->caching_ctl = NULL; |
9d66e233 JB |
548 | cache->cached = BTRFS_CACHE_FINISHED; |
549 | cache->last_byte_to_unpin = (u64)-1; | |
550 | } else { | |
291c7d2f JB |
551 | if (load_cache_only) { |
552 | cache->caching_ctl = NULL; | |
553 | cache->cached = BTRFS_CACHE_NO; | |
554 | } else { | |
555 | cache->cached = BTRFS_CACHE_STARTED; | |
556 | } | |
9d66e233 JB |
557 | } |
558 | spin_unlock(&cache->lock); | |
291c7d2f | 559 | wake_up(&caching_ctl->wait); |
3c14874a | 560 | if (ret == 1) { |
291c7d2f | 561 | put_caching_control(caching_ctl); |
3c14874a | 562 | free_excluded_extents(fs_info->extent_root, cache); |
9d66e233 | 563 | return 0; |
3c14874a | 564 | } |
291c7d2f JB |
565 | } else { |
566 | /* | |
567 | * We are not going to do the fast caching, set cached to the | |
568 | * appropriate value and wakeup any waiters. | |
569 | */ | |
570 | spin_lock(&cache->lock); | |
571 | if (load_cache_only) { | |
572 | cache->caching_ctl = NULL; | |
573 | cache->cached = BTRFS_CACHE_NO; | |
574 | } else { | |
575 | cache->cached = BTRFS_CACHE_STARTED; | |
576 | } | |
577 | spin_unlock(&cache->lock); | |
578 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
579 | } |
580 | ||
291c7d2f JB |
581 | if (load_cache_only) { |
582 | put_caching_control(caching_ctl); | |
11833d66 | 583 | return 0; |
817d52f8 | 584 | } |
817d52f8 | 585 | |
11833d66 | 586 | down_write(&fs_info->extent_commit_sem); |
291c7d2f | 587 | atomic_inc(&caching_ctl->count); |
11833d66 YZ |
588 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
589 | up_write(&fs_info->extent_commit_sem); | |
590 | ||
11dfe35a | 591 | btrfs_get_block_group(cache); |
11833d66 | 592 | |
bab39bf9 | 593 | btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 594 | |
ef8bbdfe | 595 | return ret; |
e37c9e69 CM |
596 | } |
597 | ||
0f9dd46c JB |
598 | /* |
599 | * return the block group that starts at or after bytenr | |
600 | */ | |
d397712b CM |
601 | static struct btrfs_block_group_cache * |
602 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 603 | { |
0f9dd46c | 604 | struct btrfs_block_group_cache *cache; |
0ef3e66b | 605 | |
0f9dd46c | 606 | cache = block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b | 607 | |
0f9dd46c | 608 | return cache; |
0ef3e66b CM |
609 | } |
610 | ||
0f9dd46c | 611 | /* |
9f55684c | 612 | * return the block group that contains the given bytenr |
0f9dd46c | 613 | */ |
d397712b CM |
614 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
615 | struct btrfs_fs_info *info, | |
616 | u64 bytenr) | |
be744175 | 617 | { |
0f9dd46c | 618 | struct btrfs_block_group_cache *cache; |
be744175 | 619 | |
0f9dd46c | 620 | cache = block_group_cache_tree_search(info, bytenr, 1); |
96b5179d | 621 | |
0f9dd46c | 622 | return cache; |
be744175 | 623 | } |
0b86a832 | 624 | |
0f9dd46c JB |
625 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
626 | u64 flags) | |
6324fbf3 | 627 | { |
0f9dd46c | 628 | struct list_head *head = &info->space_info; |
0f9dd46c | 629 | struct btrfs_space_info *found; |
4184ea7f | 630 | |
52ba6929 | 631 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 632 | |
4184ea7f CM |
633 | rcu_read_lock(); |
634 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 635 | if (found->flags & flags) { |
4184ea7f | 636 | rcu_read_unlock(); |
0f9dd46c | 637 | return found; |
4184ea7f | 638 | } |
0f9dd46c | 639 | } |
4184ea7f | 640 | rcu_read_unlock(); |
0f9dd46c | 641 | return NULL; |
6324fbf3 CM |
642 | } |
643 | ||
4184ea7f CM |
644 | /* |
645 | * after adding space to the filesystem, we need to clear the full flags | |
646 | * on all the space infos. | |
647 | */ | |
648 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
649 | { | |
650 | struct list_head *head = &info->space_info; | |
651 | struct btrfs_space_info *found; | |
652 | ||
653 | rcu_read_lock(); | |
654 | list_for_each_entry_rcu(found, head, list) | |
655 | found->full = 0; | |
656 | rcu_read_unlock(); | |
657 | } | |
658 | ||
d2fb3437 YZ |
659 | u64 btrfs_find_block_group(struct btrfs_root *root, |
660 | u64 search_start, u64 search_hint, int owner) | |
cd1bc465 | 661 | { |
96b5179d | 662 | struct btrfs_block_group_cache *cache; |
cd1bc465 | 663 | u64 used; |
d2fb3437 YZ |
664 | u64 last = max(search_hint, search_start); |
665 | u64 group_start = 0; | |
31f3c99b | 666 | int full_search = 0; |
d2fb3437 | 667 | int factor = 9; |
0ef3e66b | 668 | int wrapped = 0; |
31f3c99b | 669 | again: |
e8569813 ZY |
670 | while (1) { |
671 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
0f9dd46c JB |
672 | if (!cache) |
673 | break; | |
96b5179d | 674 | |
c286ac48 | 675 | spin_lock(&cache->lock); |
96b5179d CM |
676 | last = cache->key.objectid + cache->key.offset; |
677 | used = btrfs_block_group_used(&cache->item); | |
678 | ||
d2fb3437 YZ |
679 | if ((full_search || !cache->ro) && |
680 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { | |
e8569813 | 681 | if (used + cache->pinned + cache->reserved < |
d2fb3437 YZ |
682 | div_factor(cache->key.offset, factor)) { |
683 | group_start = cache->key.objectid; | |
c286ac48 | 684 | spin_unlock(&cache->lock); |
fa9c0d79 | 685 | btrfs_put_block_group(cache); |
8790d502 CM |
686 | goto found; |
687 | } | |
6324fbf3 | 688 | } |
c286ac48 | 689 | spin_unlock(&cache->lock); |
fa9c0d79 | 690 | btrfs_put_block_group(cache); |
de428b63 | 691 | cond_resched(); |
cd1bc465 | 692 | } |
0ef3e66b CM |
693 | if (!wrapped) { |
694 | last = search_start; | |
695 | wrapped = 1; | |
696 | goto again; | |
697 | } | |
698 | if (!full_search && factor < 10) { | |
be744175 | 699 | last = search_start; |
31f3c99b | 700 | full_search = 1; |
0ef3e66b | 701 | factor = 10; |
31f3c99b CM |
702 | goto again; |
703 | } | |
be744175 | 704 | found: |
d2fb3437 | 705 | return group_start; |
925baedd | 706 | } |
0f9dd46c | 707 | |
e02119d5 | 708 | /* simple helper to search for an existing extent at a given offset */ |
31840ae1 | 709 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
e02119d5 CM |
710 | { |
711 | int ret; | |
712 | struct btrfs_key key; | |
31840ae1 | 713 | struct btrfs_path *path; |
e02119d5 | 714 | |
31840ae1 | 715 | path = btrfs_alloc_path(); |
d8926bb3 MF |
716 | if (!path) |
717 | return -ENOMEM; | |
718 | ||
e02119d5 CM |
719 | key.objectid = start; |
720 | key.offset = len; | |
721 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
722 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, | |
723 | 0, 0); | |
31840ae1 | 724 | btrfs_free_path(path); |
7bb86316 CM |
725 | return ret; |
726 | } | |
727 | ||
a22285a6 YZ |
728 | /* |
729 | * helper function to lookup reference count and flags of extent. | |
730 | * | |
731 | * the head node for delayed ref is used to store the sum of all the | |
732 | * reference count modifications queued up in the rbtree. the head | |
733 | * node may also store the extent flags to set. This way you can check | |
734 | * to see what the reference count and extent flags would be if all of | |
735 | * the delayed refs are not processed. | |
736 | */ | |
737 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
738 | struct btrfs_root *root, u64 bytenr, | |
739 | u64 num_bytes, u64 *refs, u64 *flags) | |
740 | { | |
741 | struct btrfs_delayed_ref_head *head; | |
742 | struct btrfs_delayed_ref_root *delayed_refs; | |
743 | struct btrfs_path *path; | |
744 | struct btrfs_extent_item *ei; | |
745 | struct extent_buffer *leaf; | |
746 | struct btrfs_key key; | |
747 | u32 item_size; | |
748 | u64 num_refs; | |
749 | u64 extent_flags; | |
750 | int ret; | |
751 | ||
752 | path = btrfs_alloc_path(); | |
753 | if (!path) | |
754 | return -ENOMEM; | |
755 | ||
756 | key.objectid = bytenr; | |
757 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
758 | key.offset = num_bytes; | |
759 | if (!trans) { | |
760 | path->skip_locking = 1; | |
761 | path->search_commit_root = 1; | |
762 | } | |
763 | again: | |
764 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, | |
765 | &key, path, 0, 0); | |
766 | if (ret < 0) | |
767 | goto out_free; | |
768 | ||
769 | if (ret == 0) { | |
770 | leaf = path->nodes[0]; | |
771 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
772 | if (item_size >= sizeof(*ei)) { | |
773 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
774 | struct btrfs_extent_item); | |
775 | num_refs = btrfs_extent_refs(leaf, ei); | |
776 | extent_flags = btrfs_extent_flags(leaf, ei); | |
777 | } else { | |
778 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
779 | struct btrfs_extent_item_v0 *ei0; | |
780 | BUG_ON(item_size != sizeof(*ei0)); | |
781 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
782 | struct btrfs_extent_item_v0); | |
783 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
784 | /* FIXME: this isn't correct for data */ | |
785 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
786 | #else | |
787 | BUG(); | |
788 | #endif | |
789 | } | |
790 | BUG_ON(num_refs == 0); | |
791 | } else { | |
792 | num_refs = 0; | |
793 | extent_flags = 0; | |
794 | ret = 0; | |
795 | } | |
796 | ||
797 | if (!trans) | |
798 | goto out; | |
799 | ||
800 | delayed_refs = &trans->transaction->delayed_refs; | |
801 | spin_lock(&delayed_refs->lock); | |
802 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
803 | if (head) { | |
804 | if (!mutex_trylock(&head->mutex)) { | |
805 | atomic_inc(&head->node.refs); | |
806 | spin_unlock(&delayed_refs->lock); | |
807 | ||
b3b4aa74 | 808 | btrfs_release_path(path); |
a22285a6 | 809 | |
8cc33e5c DS |
810 | /* |
811 | * Mutex was contended, block until it's released and try | |
812 | * again | |
813 | */ | |
a22285a6 YZ |
814 | mutex_lock(&head->mutex); |
815 | mutex_unlock(&head->mutex); | |
816 | btrfs_put_delayed_ref(&head->node); | |
817 | goto again; | |
818 | } | |
819 | if (head->extent_op && head->extent_op->update_flags) | |
820 | extent_flags |= head->extent_op->flags_to_set; | |
821 | else | |
822 | BUG_ON(num_refs == 0); | |
823 | ||
824 | num_refs += head->node.ref_mod; | |
825 | mutex_unlock(&head->mutex); | |
826 | } | |
827 | spin_unlock(&delayed_refs->lock); | |
828 | out: | |
829 | WARN_ON(num_refs == 0); | |
830 | if (refs) | |
831 | *refs = num_refs; | |
832 | if (flags) | |
833 | *flags = extent_flags; | |
834 | out_free: | |
835 | btrfs_free_path(path); | |
836 | return ret; | |
837 | } | |
838 | ||
d8d5f3e1 CM |
839 | /* |
840 | * Back reference rules. Back refs have three main goals: | |
841 | * | |
842 | * 1) differentiate between all holders of references to an extent so that | |
843 | * when a reference is dropped we can make sure it was a valid reference | |
844 | * before freeing the extent. | |
845 | * | |
846 | * 2) Provide enough information to quickly find the holders of an extent | |
847 | * if we notice a given block is corrupted or bad. | |
848 | * | |
849 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
850 | * maintenance. This is actually the same as #2, but with a slightly | |
851 | * different use case. | |
852 | * | |
5d4f98a2 YZ |
853 | * There are two kinds of back refs. The implicit back refs is optimized |
854 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
855 | * back refs of this kind provide information about the block's owner tree | |
856 | * and the pointer's key. These information allow us to find the block by | |
857 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
858 | * referenced by their owner trees. The location of tree block is recorded | |
859 | * in the back refs. Actually the full back refs is generic, and can be | |
860 | * used in all cases the implicit back refs is used. The major shortcoming | |
861 | * of the full back refs is its overhead. Every time a tree block gets | |
862 | * COWed, we have to update back refs entry for all pointers in it. | |
863 | * | |
864 | * For a newly allocated tree block, we use implicit back refs for | |
865 | * pointers in it. This means most tree related operations only involve | |
866 | * implicit back refs. For a tree block created in old transaction, the | |
867 | * only way to drop a reference to it is COW it. So we can detect the | |
868 | * event that tree block loses its owner tree's reference and do the | |
869 | * back refs conversion. | |
870 | * | |
871 | * When a tree block is COW'd through a tree, there are four cases: | |
872 | * | |
873 | * The reference count of the block is one and the tree is the block's | |
874 | * owner tree. Nothing to do in this case. | |
875 | * | |
876 | * The reference count of the block is one and the tree is not the | |
877 | * block's owner tree. In this case, full back refs is used for pointers | |
878 | * in the block. Remove these full back refs, add implicit back refs for | |
879 | * every pointers in the new block. | |
880 | * | |
881 | * The reference count of the block is greater than one and the tree is | |
882 | * the block's owner tree. In this case, implicit back refs is used for | |
883 | * pointers in the block. Add full back refs for every pointers in the | |
884 | * block, increase lower level extents' reference counts. The original | |
885 | * implicit back refs are entailed to the new block. | |
886 | * | |
887 | * The reference count of the block is greater than one and the tree is | |
888 | * not the block's owner tree. Add implicit back refs for every pointer in | |
889 | * the new block, increase lower level extents' reference count. | |
890 | * | |
891 | * Back Reference Key composing: | |
892 | * | |
893 | * The key objectid corresponds to the first byte in the extent, | |
894 | * The key type is used to differentiate between types of back refs. | |
895 | * There are different meanings of the key offset for different types | |
896 | * of back refs. | |
897 | * | |
d8d5f3e1 CM |
898 | * File extents can be referenced by: |
899 | * | |
900 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 901 | * - different files inside a single subvolume |
d8d5f3e1 CM |
902 | * - different offsets inside a file (bookend extents in file.c) |
903 | * | |
5d4f98a2 | 904 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
905 | * |
906 | * - Objectid of the subvolume root | |
d8d5f3e1 | 907 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
908 | * - original offset in the file |
909 | * - how many bookend extents | |
d8d5f3e1 | 910 | * |
5d4f98a2 YZ |
911 | * The key offset for the implicit back refs is hash of the first |
912 | * three fields. | |
d8d5f3e1 | 913 | * |
5d4f98a2 | 914 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 915 | * |
5d4f98a2 | 916 | * - number of pointers in the tree leaf |
d8d5f3e1 | 917 | * |
5d4f98a2 YZ |
918 | * The key offset for the implicit back refs is the first byte of |
919 | * the tree leaf | |
d8d5f3e1 | 920 | * |
5d4f98a2 YZ |
921 | * When a file extent is allocated, The implicit back refs is used. |
922 | * the fields are filled in: | |
d8d5f3e1 | 923 | * |
5d4f98a2 | 924 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 925 | * |
5d4f98a2 YZ |
926 | * When a file extent is removed file truncation, we find the |
927 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 928 | * |
5d4f98a2 | 929 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 930 | * |
5d4f98a2 | 931 | * Btree extents can be referenced by: |
d8d5f3e1 | 932 | * |
5d4f98a2 | 933 | * - Different subvolumes |
d8d5f3e1 | 934 | * |
5d4f98a2 YZ |
935 | * Both the implicit back refs and the full back refs for tree blocks |
936 | * only consist of key. The key offset for the implicit back refs is | |
937 | * objectid of block's owner tree. The key offset for the full back refs | |
938 | * is the first byte of parent block. | |
d8d5f3e1 | 939 | * |
5d4f98a2 YZ |
940 | * When implicit back refs is used, information about the lowest key and |
941 | * level of the tree block are required. These information are stored in | |
942 | * tree block info structure. | |
d8d5f3e1 | 943 | */ |
31840ae1 | 944 | |
5d4f98a2 YZ |
945 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
946 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
947 | struct btrfs_root *root, | |
948 | struct btrfs_path *path, | |
949 | u64 owner, u32 extra_size) | |
7bb86316 | 950 | { |
5d4f98a2 YZ |
951 | struct btrfs_extent_item *item; |
952 | struct btrfs_extent_item_v0 *ei0; | |
953 | struct btrfs_extent_ref_v0 *ref0; | |
954 | struct btrfs_tree_block_info *bi; | |
955 | struct extent_buffer *leaf; | |
7bb86316 | 956 | struct btrfs_key key; |
5d4f98a2 YZ |
957 | struct btrfs_key found_key; |
958 | u32 new_size = sizeof(*item); | |
959 | u64 refs; | |
960 | int ret; | |
961 | ||
962 | leaf = path->nodes[0]; | |
963 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
964 | ||
965 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
966 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
967 | struct btrfs_extent_item_v0); | |
968 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
969 | ||
970 | if (owner == (u64)-1) { | |
971 | while (1) { | |
972 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
973 | ret = btrfs_next_leaf(root, path); | |
974 | if (ret < 0) | |
975 | return ret; | |
79787eaa | 976 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
977 | leaf = path->nodes[0]; |
978 | } | |
979 | btrfs_item_key_to_cpu(leaf, &found_key, | |
980 | path->slots[0]); | |
981 | BUG_ON(key.objectid != found_key.objectid); | |
982 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
983 | path->slots[0]++; | |
984 | continue; | |
985 | } | |
986 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
987 | struct btrfs_extent_ref_v0); | |
988 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
989 | break; | |
990 | } | |
991 | } | |
b3b4aa74 | 992 | btrfs_release_path(path); |
5d4f98a2 YZ |
993 | |
994 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
995 | new_size += sizeof(*bi); | |
996 | ||
997 | new_size -= sizeof(*ei0); | |
998 | ret = btrfs_search_slot(trans, root, &key, path, | |
999 | new_size + extra_size, 1); | |
1000 | if (ret < 0) | |
1001 | return ret; | |
79787eaa | 1002 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1003 | |
143bede5 | 1004 | btrfs_extend_item(trans, root, path, new_size); |
5d4f98a2 YZ |
1005 | |
1006 | leaf = path->nodes[0]; | |
1007 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1008 | btrfs_set_extent_refs(leaf, item, refs); | |
1009 | /* FIXME: get real generation */ | |
1010 | btrfs_set_extent_generation(leaf, item, 0); | |
1011 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1012 | btrfs_set_extent_flags(leaf, item, | |
1013 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1014 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1015 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1016 | /* FIXME: get first key of the block */ | |
1017 | memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi)); | |
1018 | btrfs_set_tree_block_level(leaf, bi, (int)owner); | |
1019 | } else { | |
1020 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1021 | } | |
1022 | btrfs_mark_buffer_dirty(leaf); | |
1023 | return 0; | |
1024 | } | |
1025 | #endif | |
1026 | ||
1027 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) | |
1028 | { | |
1029 | u32 high_crc = ~(u32)0; | |
1030 | u32 low_crc = ~(u32)0; | |
1031 | __le64 lenum; | |
1032 | ||
1033 | lenum = cpu_to_le64(root_objectid); | |
163e783e | 1034 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1035 | lenum = cpu_to_le64(owner); |
163e783e | 1036 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1037 | lenum = cpu_to_le64(offset); |
163e783e | 1038 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1039 | |
1040 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1041 | } | |
1042 | ||
1043 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1044 | struct btrfs_extent_data_ref *ref) | |
1045 | { | |
1046 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1047 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1048 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1049 | } | |
1050 | ||
1051 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1052 | struct btrfs_extent_data_ref *ref, | |
1053 | u64 root_objectid, u64 owner, u64 offset) | |
1054 | { | |
1055 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1056 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1057 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1058 | return 0; | |
1059 | return 1; | |
1060 | } | |
1061 | ||
1062 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
1063 | struct btrfs_root *root, | |
1064 | struct btrfs_path *path, | |
1065 | u64 bytenr, u64 parent, | |
1066 | u64 root_objectid, | |
1067 | u64 owner, u64 offset) | |
1068 | { | |
1069 | struct btrfs_key key; | |
1070 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1071 | struct extent_buffer *leaf; |
5d4f98a2 | 1072 | u32 nritems; |
74493f7a | 1073 | int ret; |
5d4f98a2 YZ |
1074 | int recow; |
1075 | int err = -ENOENT; | |
74493f7a | 1076 | |
31840ae1 | 1077 | key.objectid = bytenr; |
5d4f98a2 YZ |
1078 | if (parent) { |
1079 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1080 | key.offset = parent; | |
1081 | } else { | |
1082 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1083 | key.offset = hash_extent_data_ref(root_objectid, | |
1084 | owner, offset); | |
1085 | } | |
1086 | again: | |
1087 | recow = 0; | |
1088 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1089 | if (ret < 0) { | |
1090 | err = ret; | |
1091 | goto fail; | |
1092 | } | |
31840ae1 | 1093 | |
5d4f98a2 YZ |
1094 | if (parent) { |
1095 | if (!ret) | |
1096 | return 0; | |
1097 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1098 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1099 | btrfs_release_path(path); |
5d4f98a2 YZ |
1100 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1101 | if (ret < 0) { | |
1102 | err = ret; | |
1103 | goto fail; | |
1104 | } | |
1105 | if (!ret) | |
1106 | return 0; | |
1107 | #endif | |
1108 | goto fail; | |
31840ae1 ZY |
1109 | } |
1110 | ||
1111 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1112 | nritems = btrfs_header_nritems(leaf); |
1113 | while (1) { | |
1114 | if (path->slots[0] >= nritems) { | |
1115 | ret = btrfs_next_leaf(root, path); | |
1116 | if (ret < 0) | |
1117 | err = ret; | |
1118 | if (ret) | |
1119 | goto fail; | |
1120 | ||
1121 | leaf = path->nodes[0]; | |
1122 | nritems = btrfs_header_nritems(leaf); | |
1123 | recow = 1; | |
1124 | } | |
1125 | ||
1126 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1127 | if (key.objectid != bytenr || | |
1128 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1129 | goto fail; | |
1130 | ||
1131 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1132 | struct btrfs_extent_data_ref); | |
1133 | ||
1134 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1135 | owner, offset)) { | |
1136 | if (recow) { | |
b3b4aa74 | 1137 | btrfs_release_path(path); |
5d4f98a2 YZ |
1138 | goto again; |
1139 | } | |
1140 | err = 0; | |
1141 | break; | |
1142 | } | |
1143 | path->slots[0]++; | |
31840ae1 | 1144 | } |
5d4f98a2 YZ |
1145 | fail: |
1146 | return err; | |
31840ae1 ZY |
1147 | } |
1148 | ||
5d4f98a2 YZ |
1149 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
1150 | struct btrfs_root *root, | |
1151 | struct btrfs_path *path, | |
1152 | u64 bytenr, u64 parent, | |
1153 | u64 root_objectid, u64 owner, | |
1154 | u64 offset, int refs_to_add) | |
31840ae1 ZY |
1155 | { |
1156 | struct btrfs_key key; | |
1157 | struct extent_buffer *leaf; | |
5d4f98a2 | 1158 | u32 size; |
31840ae1 ZY |
1159 | u32 num_refs; |
1160 | int ret; | |
74493f7a | 1161 | |
74493f7a | 1162 | key.objectid = bytenr; |
5d4f98a2 YZ |
1163 | if (parent) { |
1164 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1165 | key.offset = parent; | |
1166 | size = sizeof(struct btrfs_shared_data_ref); | |
1167 | } else { | |
1168 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1169 | key.offset = hash_extent_data_ref(root_objectid, | |
1170 | owner, offset); | |
1171 | size = sizeof(struct btrfs_extent_data_ref); | |
1172 | } | |
74493f7a | 1173 | |
5d4f98a2 YZ |
1174 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1175 | if (ret && ret != -EEXIST) | |
1176 | goto fail; | |
1177 | ||
1178 | leaf = path->nodes[0]; | |
1179 | if (parent) { | |
1180 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1181 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1182 | struct btrfs_shared_data_ref); |
1183 | if (ret == 0) { | |
1184 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1185 | } else { | |
1186 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1187 | num_refs += refs_to_add; | |
1188 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1189 | } |
5d4f98a2 YZ |
1190 | } else { |
1191 | struct btrfs_extent_data_ref *ref; | |
1192 | while (ret == -EEXIST) { | |
1193 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1194 | struct btrfs_extent_data_ref); | |
1195 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1196 | owner, offset)) | |
1197 | break; | |
b3b4aa74 | 1198 | btrfs_release_path(path); |
5d4f98a2 YZ |
1199 | key.offset++; |
1200 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1201 | size); | |
1202 | if (ret && ret != -EEXIST) | |
1203 | goto fail; | |
31840ae1 | 1204 | |
5d4f98a2 YZ |
1205 | leaf = path->nodes[0]; |
1206 | } | |
1207 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1208 | struct btrfs_extent_data_ref); | |
1209 | if (ret == 0) { | |
1210 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1211 | root_objectid); | |
1212 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1213 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1214 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1215 | } else { | |
1216 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1217 | num_refs += refs_to_add; | |
1218 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1219 | } |
31840ae1 | 1220 | } |
5d4f98a2 YZ |
1221 | btrfs_mark_buffer_dirty(leaf); |
1222 | ret = 0; | |
1223 | fail: | |
b3b4aa74 | 1224 | btrfs_release_path(path); |
7bb86316 | 1225 | return ret; |
74493f7a CM |
1226 | } |
1227 | ||
5d4f98a2 YZ |
1228 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
1229 | struct btrfs_root *root, | |
1230 | struct btrfs_path *path, | |
1231 | int refs_to_drop) | |
31840ae1 | 1232 | { |
5d4f98a2 YZ |
1233 | struct btrfs_key key; |
1234 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1235 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1236 | struct extent_buffer *leaf; |
5d4f98a2 | 1237 | u32 num_refs = 0; |
31840ae1 ZY |
1238 | int ret = 0; |
1239 | ||
1240 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1241 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1242 | ||
1243 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1244 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1245 | struct btrfs_extent_data_ref); | |
1246 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1247 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1248 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1249 | struct btrfs_shared_data_ref); | |
1250 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1251 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1252 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1253 | struct btrfs_extent_ref_v0 *ref0; | |
1254 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1255 | struct btrfs_extent_ref_v0); | |
1256 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1257 | #endif | |
1258 | } else { | |
1259 | BUG(); | |
1260 | } | |
1261 | ||
56bec294 CM |
1262 | BUG_ON(num_refs < refs_to_drop); |
1263 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1264 | |
31840ae1 ZY |
1265 | if (num_refs == 0) { |
1266 | ret = btrfs_del_item(trans, root, path); | |
1267 | } else { | |
5d4f98a2 YZ |
1268 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1269 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1270 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1271 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1272 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1273 | else { | |
1274 | struct btrfs_extent_ref_v0 *ref0; | |
1275 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1276 | struct btrfs_extent_ref_v0); | |
1277 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1278 | } | |
1279 | #endif | |
31840ae1 ZY |
1280 | btrfs_mark_buffer_dirty(leaf); |
1281 | } | |
31840ae1 ZY |
1282 | return ret; |
1283 | } | |
1284 | ||
5d4f98a2 YZ |
1285 | static noinline u32 extent_data_ref_count(struct btrfs_root *root, |
1286 | struct btrfs_path *path, | |
1287 | struct btrfs_extent_inline_ref *iref) | |
15916de8 | 1288 | { |
5d4f98a2 YZ |
1289 | struct btrfs_key key; |
1290 | struct extent_buffer *leaf; | |
1291 | struct btrfs_extent_data_ref *ref1; | |
1292 | struct btrfs_shared_data_ref *ref2; | |
1293 | u32 num_refs = 0; | |
1294 | ||
1295 | leaf = path->nodes[0]; | |
1296 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1297 | if (iref) { | |
1298 | if (btrfs_extent_inline_ref_type(leaf, iref) == | |
1299 | BTRFS_EXTENT_DATA_REF_KEY) { | |
1300 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1301 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1302 | } else { | |
1303 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1304 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1305 | } | |
1306 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1307 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1308 | struct btrfs_extent_data_ref); | |
1309 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1310 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1311 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1312 | struct btrfs_shared_data_ref); | |
1313 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1314 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1315 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1316 | struct btrfs_extent_ref_v0 *ref0; | |
1317 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1318 | struct btrfs_extent_ref_v0); | |
1319 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1320 | #endif |
5d4f98a2 YZ |
1321 | } else { |
1322 | WARN_ON(1); | |
1323 | } | |
1324 | return num_refs; | |
1325 | } | |
15916de8 | 1326 | |
5d4f98a2 YZ |
1327 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
1328 | struct btrfs_root *root, | |
1329 | struct btrfs_path *path, | |
1330 | u64 bytenr, u64 parent, | |
1331 | u64 root_objectid) | |
1f3c79a2 | 1332 | { |
5d4f98a2 | 1333 | struct btrfs_key key; |
1f3c79a2 | 1334 | int ret; |
1f3c79a2 | 1335 | |
5d4f98a2 YZ |
1336 | key.objectid = bytenr; |
1337 | if (parent) { | |
1338 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1339 | key.offset = parent; | |
1340 | } else { | |
1341 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1342 | key.offset = root_objectid; | |
1f3c79a2 LH |
1343 | } |
1344 | ||
5d4f98a2 YZ |
1345 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1346 | if (ret > 0) | |
1347 | ret = -ENOENT; | |
1348 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1349 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1350 | btrfs_release_path(path); |
5d4f98a2 YZ |
1351 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1352 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1353 | if (ret > 0) | |
1354 | ret = -ENOENT; | |
1355 | } | |
1f3c79a2 | 1356 | #endif |
5d4f98a2 | 1357 | return ret; |
1f3c79a2 LH |
1358 | } |
1359 | ||
5d4f98a2 YZ |
1360 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
1361 | struct btrfs_root *root, | |
1362 | struct btrfs_path *path, | |
1363 | u64 bytenr, u64 parent, | |
1364 | u64 root_objectid) | |
31840ae1 | 1365 | { |
5d4f98a2 | 1366 | struct btrfs_key key; |
31840ae1 | 1367 | int ret; |
31840ae1 | 1368 | |
5d4f98a2 YZ |
1369 | key.objectid = bytenr; |
1370 | if (parent) { | |
1371 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1372 | key.offset = parent; | |
1373 | } else { | |
1374 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1375 | key.offset = root_objectid; | |
1376 | } | |
1377 | ||
1378 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
b3b4aa74 | 1379 | btrfs_release_path(path); |
31840ae1 ZY |
1380 | return ret; |
1381 | } | |
1382 | ||
5d4f98a2 | 1383 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1384 | { |
5d4f98a2 YZ |
1385 | int type; |
1386 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1387 | if (parent > 0) | |
1388 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1389 | else | |
1390 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1391 | } else { | |
1392 | if (parent > 0) | |
1393 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1394 | else | |
1395 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1396 | } | |
1397 | return type; | |
31840ae1 | 1398 | } |
56bec294 | 1399 | |
2c47e605 YZ |
1400 | static int find_next_key(struct btrfs_path *path, int level, |
1401 | struct btrfs_key *key) | |
56bec294 | 1402 | |
02217ed2 | 1403 | { |
2c47e605 | 1404 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1405 | if (!path->nodes[level]) |
1406 | break; | |
5d4f98a2 YZ |
1407 | if (path->slots[level] + 1 >= |
1408 | btrfs_header_nritems(path->nodes[level])) | |
1409 | continue; | |
1410 | if (level == 0) | |
1411 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1412 | path->slots[level] + 1); | |
1413 | else | |
1414 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1415 | path->slots[level] + 1); | |
1416 | return 0; | |
1417 | } | |
1418 | return 1; | |
1419 | } | |
037e6390 | 1420 | |
5d4f98a2 YZ |
1421 | /* |
1422 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1423 | * to the address of inline back ref, and 0 is returned. | |
1424 | * | |
1425 | * if back ref isn't found, *ref_ret is set to the address where it | |
1426 | * should be inserted, and -ENOENT is returned. | |
1427 | * | |
1428 | * if insert is true and there are too many inline back refs, the path | |
1429 | * points to the extent item, and -EAGAIN is returned. | |
1430 | * | |
1431 | * NOTE: inline back refs are ordered in the same way that back ref | |
1432 | * items in the tree are ordered. | |
1433 | */ | |
1434 | static noinline_for_stack | |
1435 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1436 | struct btrfs_root *root, | |
1437 | struct btrfs_path *path, | |
1438 | struct btrfs_extent_inline_ref **ref_ret, | |
1439 | u64 bytenr, u64 num_bytes, | |
1440 | u64 parent, u64 root_objectid, | |
1441 | u64 owner, u64 offset, int insert) | |
1442 | { | |
1443 | struct btrfs_key key; | |
1444 | struct extent_buffer *leaf; | |
1445 | struct btrfs_extent_item *ei; | |
1446 | struct btrfs_extent_inline_ref *iref; | |
1447 | u64 flags; | |
1448 | u64 item_size; | |
1449 | unsigned long ptr; | |
1450 | unsigned long end; | |
1451 | int extra_size; | |
1452 | int type; | |
1453 | int want; | |
1454 | int ret; | |
1455 | int err = 0; | |
26b8003f | 1456 | |
db94535d | 1457 | key.objectid = bytenr; |
31840ae1 | 1458 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1459 | key.offset = num_bytes; |
31840ae1 | 1460 | |
5d4f98a2 YZ |
1461 | want = extent_ref_type(parent, owner); |
1462 | if (insert) { | |
1463 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1464 | path->keep_locks = 1; |
5d4f98a2 YZ |
1465 | } else |
1466 | extra_size = -1; | |
1467 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); | |
b9473439 | 1468 | if (ret < 0) { |
5d4f98a2 YZ |
1469 | err = ret; |
1470 | goto out; | |
1471 | } | |
79787eaa JM |
1472 | if (ret && !insert) { |
1473 | err = -ENOENT; | |
1474 | goto out; | |
492104c8 JB |
1475 | } else if (ret) { |
1476 | err = -EIO; | |
1477 | WARN_ON(1); | |
1478 | goto out; | |
79787eaa | 1479 | } |
5d4f98a2 YZ |
1480 | |
1481 | leaf = path->nodes[0]; | |
1482 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1483 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1484 | if (item_size < sizeof(*ei)) { | |
1485 | if (!insert) { | |
1486 | err = -ENOENT; | |
1487 | goto out; | |
1488 | } | |
1489 | ret = convert_extent_item_v0(trans, root, path, owner, | |
1490 | extra_size); | |
1491 | if (ret < 0) { | |
1492 | err = ret; | |
1493 | goto out; | |
1494 | } | |
1495 | leaf = path->nodes[0]; | |
1496 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1497 | } | |
1498 | #endif | |
1499 | BUG_ON(item_size < sizeof(*ei)); | |
1500 | ||
5d4f98a2 YZ |
1501 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1502 | flags = btrfs_extent_flags(leaf, ei); | |
1503 | ||
1504 | ptr = (unsigned long)(ei + 1); | |
1505 | end = (unsigned long)ei + item_size; | |
1506 | ||
1507 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1508 | ptr += sizeof(struct btrfs_tree_block_info); | |
1509 | BUG_ON(ptr > end); | |
1510 | } else { | |
1511 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA)); | |
1512 | } | |
1513 | ||
1514 | err = -ENOENT; | |
1515 | while (1) { | |
1516 | if (ptr >= end) { | |
1517 | WARN_ON(ptr > end); | |
1518 | break; | |
1519 | } | |
1520 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1521 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1522 | if (want < type) | |
1523 | break; | |
1524 | if (want > type) { | |
1525 | ptr += btrfs_extent_inline_ref_size(type); | |
1526 | continue; | |
1527 | } | |
1528 | ||
1529 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1530 | struct btrfs_extent_data_ref *dref; | |
1531 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1532 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1533 | owner, offset)) { | |
1534 | err = 0; | |
1535 | break; | |
1536 | } | |
1537 | if (hash_extent_data_ref_item(leaf, dref) < | |
1538 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1539 | break; | |
1540 | } else { | |
1541 | u64 ref_offset; | |
1542 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1543 | if (parent > 0) { | |
1544 | if (parent == ref_offset) { | |
1545 | err = 0; | |
1546 | break; | |
1547 | } | |
1548 | if (ref_offset < parent) | |
1549 | break; | |
1550 | } else { | |
1551 | if (root_objectid == ref_offset) { | |
1552 | err = 0; | |
1553 | break; | |
1554 | } | |
1555 | if (ref_offset < root_objectid) | |
1556 | break; | |
1557 | } | |
1558 | } | |
1559 | ptr += btrfs_extent_inline_ref_size(type); | |
1560 | } | |
1561 | if (err == -ENOENT && insert) { | |
1562 | if (item_size + extra_size >= | |
1563 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1564 | err = -EAGAIN; | |
1565 | goto out; | |
1566 | } | |
1567 | /* | |
1568 | * To add new inline back ref, we have to make sure | |
1569 | * there is no corresponding back ref item. | |
1570 | * For simplicity, we just do not add new inline back | |
1571 | * ref if there is any kind of item for this block | |
1572 | */ | |
2c47e605 YZ |
1573 | if (find_next_key(path, 0, &key) == 0 && |
1574 | key.objectid == bytenr && | |
85d4198e | 1575 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1576 | err = -EAGAIN; |
1577 | goto out; | |
1578 | } | |
1579 | } | |
1580 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1581 | out: | |
85d4198e | 1582 | if (insert) { |
5d4f98a2 YZ |
1583 | path->keep_locks = 0; |
1584 | btrfs_unlock_up_safe(path, 1); | |
1585 | } | |
1586 | return err; | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * helper to add new inline back ref | |
1591 | */ | |
1592 | static noinline_for_stack | |
143bede5 JM |
1593 | void setup_inline_extent_backref(struct btrfs_trans_handle *trans, |
1594 | struct btrfs_root *root, | |
1595 | struct btrfs_path *path, | |
1596 | struct btrfs_extent_inline_ref *iref, | |
1597 | u64 parent, u64 root_objectid, | |
1598 | u64 owner, u64 offset, int refs_to_add, | |
1599 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1600 | { |
1601 | struct extent_buffer *leaf; | |
1602 | struct btrfs_extent_item *ei; | |
1603 | unsigned long ptr; | |
1604 | unsigned long end; | |
1605 | unsigned long item_offset; | |
1606 | u64 refs; | |
1607 | int size; | |
1608 | int type; | |
5d4f98a2 YZ |
1609 | |
1610 | leaf = path->nodes[0]; | |
1611 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1612 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1613 | ||
1614 | type = extent_ref_type(parent, owner); | |
1615 | size = btrfs_extent_inline_ref_size(type); | |
1616 | ||
143bede5 | 1617 | btrfs_extend_item(trans, root, path, size); |
5d4f98a2 YZ |
1618 | |
1619 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1620 | refs = btrfs_extent_refs(leaf, ei); | |
1621 | refs += refs_to_add; | |
1622 | btrfs_set_extent_refs(leaf, ei, refs); | |
1623 | if (extent_op) | |
1624 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1625 | ||
1626 | ptr = (unsigned long)ei + item_offset; | |
1627 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1628 | if (ptr < end - size) | |
1629 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1630 | end - size - ptr); | |
1631 | ||
1632 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1633 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1634 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1635 | struct btrfs_extent_data_ref *dref; | |
1636 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1637 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1638 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1639 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1640 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1641 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1642 | struct btrfs_shared_data_ref *sref; | |
1643 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1644 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1645 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1646 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1647 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1648 | } else { | |
1649 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1650 | } | |
1651 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1652 | } |
1653 | ||
1654 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
1655 | struct btrfs_root *root, | |
1656 | struct btrfs_path *path, | |
1657 | struct btrfs_extent_inline_ref **ref_ret, | |
1658 | u64 bytenr, u64 num_bytes, u64 parent, | |
1659 | u64 root_objectid, u64 owner, u64 offset) | |
1660 | { | |
1661 | int ret; | |
1662 | ||
1663 | ret = lookup_inline_extent_backref(trans, root, path, ref_ret, | |
1664 | bytenr, num_bytes, parent, | |
1665 | root_objectid, owner, offset, 0); | |
1666 | if (ret != -ENOENT) | |
54aa1f4d | 1667 | return ret; |
5d4f98a2 | 1668 | |
b3b4aa74 | 1669 | btrfs_release_path(path); |
5d4f98a2 YZ |
1670 | *ref_ret = NULL; |
1671 | ||
1672 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1673 | ret = lookup_tree_block_ref(trans, root, path, bytenr, parent, | |
1674 | root_objectid); | |
1675 | } else { | |
1676 | ret = lookup_extent_data_ref(trans, root, path, bytenr, parent, | |
1677 | root_objectid, owner, offset); | |
b9473439 | 1678 | } |
5d4f98a2 YZ |
1679 | return ret; |
1680 | } | |
31840ae1 | 1681 | |
5d4f98a2 YZ |
1682 | /* |
1683 | * helper to update/remove inline back ref | |
1684 | */ | |
1685 | static noinline_for_stack | |
143bede5 JM |
1686 | void update_inline_extent_backref(struct btrfs_trans_handle *trans, |
1687 | struct btrfs_root *root, | |
1688 | struct btrfs_path *path, | |
1689 | struct btrfs_extent_inline_ref *iref, | |
1690 | int refs_to_mod, | |
1691 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1692 | { |
1693 | struct extent_buffer *leaf; | |
1694 | struct btrfs_extent_item *ei; | |
1695 | struct btrfs_extent_data_ref *dref = NULL; | |
1696 | struct btrfs_shared_data_ref *sref = NULL; | |
1697 | unsigned long ptr; | |
1698 | unsigned long end; | |
1699 | u32 item_size; | |
1700 | int size; | |
1701 | int type; | |
5d4f98a2 YZ |
1702 | u64 refs; |
1703 | ||
1704 | leaf = path->nodes[0]; | |
1705 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1706 | refs = btrfs_extent_refs(leaf, ei); | |
1707 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1708 | refs += refs_to_mod; | |
1709 | btrfs_set_extent_refs(leaf, ei, refs); | |
1710 | if (extent_op) | |
1711 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1712 | ||
1713 | type = btrfs_extent_inline_ref_type(leaf, iref); | |
1714 | ||
1715 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1716 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1717 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1718 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1719 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1720 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1721 | } else { | |
1722 | refs = 1; | |
1723 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1724 | } |
31840ae1 | 1725 | |
5d4f98a2 YZ |
1726 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1727 | refs += refs_to_mod; | |
1728 | ||
1729 | if (refs > 0) { | |
1730 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1731 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1732 | else | |
1733 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1734 | } else { | |
1735 | size = btrfs_extent_inline_ref_size(type); | |
1736 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1737 | ptr = (unsigned long)iref; | |
1738 | end = (unsigned long)ei + item_size; | |
1739 | if (ptr + size < end) | |
1740 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1741 | end - ptr - size); | |
1742 | item_size -= size; | |
143bede5 | 1743 | btrfs_truncate_item(trans, root, path, item_size, 1); |
5d4f98a2 YZ |
1744 | } |
1745 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1746 | } |
1747 | ||
1748 | static noinline_for_stack | |
1749 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
1750 | struct btrfs_root *root, | |
1751 | struct btrfs_path *path, | |
1752 | u64 bytenr, u64 num_bytes, u64 parent, | |
1753 | u64 root_objectid, u64 owner, | |
1754 | u64 offset, int refs_to_add, | |
1755 | struct btrfs_delayed_extent_op *extent_op) | |
1756 | { | |
1757 | struct btrfs_extent_inline_ref *iref; | |
1758 | int ret; | |
1759 | ||
1760 | ret = lookup_inline_extent_backref(trans, root, path, &iref, | |
1761 | bytenr, num_bytes, parent, | |
1762 | root_objectid, owner, offset, 1); | |
1763 | if (ret == 0) { | |
1764 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
143bede5 JM |
1765 | update_inline_extent_backref(trans, root, path, iref, |
1766 | refs_to_add, extent_op); | |
5d4f98a2 | 1767 | } else if (ret == -ENOENT) { |
143bede5 JM |
1768 | setup_inline_extent_backref(trans, root, path, iref, parent, |
1769 | root_objectid, owner, offset, | |
1770 | refs_to_add, extent_op); | |
1771 | ret = 0; | |
771ed689 | 1772 | } |
5d4f98a2 YZ |
1773 | return ret; |
1774 | } | |
31840ae1 | 1775 | |
5d4f98a2 YZ |
1776 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
1777 | struct btrfs_root *root, | |
1778 | struct btrfs_path *path, | |
1779 | u64 bytenr, u64 parent, u64 root_objectid, | |
1780 | u64 owner, u64 offset, int refs_to_add) | |
1781 | { | |
1782 | int ret; | |
1783 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1784 | BUG_ON(refs_to_add != 1); | |
1785 | ret = insert_tree_block_ref(trans, root, path, bytenr, | |
1786 | parent, root_objectid); | |
1787 | } else { | |
1788 | ret = insert_extent_data_ref(trans, root, path, bytenr, | |
1789 | parent, root_objectid, | |
1790 | owner, offset, refs_to_add); | |
1791 | } | |
1792 | return ret; | |
1793 | } | |
56bec294 | 1794 | |
5d4f98a2 YZ |
1795 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
1796 | struct btrfs_root *root, | |
1797 | struct btrfs_path *path, | |
1798 | struct btrfs_extent_inline_ref *iref, | |
1799 | int refs_to_drop, int is_data) | |
1800 | { | |
143bede5 | 1801 | int ret = 0; |
b9473439 | 1802 | |
5d4f98a2 YZ |
1803 | BUG_ON(!is_data && refs_to_drop != 1); |
1804 | if (iref) { | |
143bede5 JM |
1805 | update_inline_extent_backref(trans, root, path, iref, |
1806 | -refs_to_drop, NULL); | |
5d4f98a2 YZ |
1807 | } else if (is_data) { |
1808 | ret = remove_extent_data_ref(trans, root, path, refs_to_drop); | |
1809 | } else { | |
1810 | ret = btrfs_del_item(trans, root, path); | |
1811 | } | |
1812 | return ret; | |
1813 | } | |
1814 | ||
5378e607 | 1815 | static int btrfs_issue_discard(struct block_device *bdev, |
5d4f98a2 YZ |
1816 | u64 start, u64 len) |
1817 | { | |
5378e607 | 1818 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0); |
5d4f98a2 | 1819 | } |
5d4f98a2 YZ |
1820 | |
1821 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 1822 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 1823 | { |
5d4f98a2 | 1824 | int ret; |
5378e607 | 1825 | u64 discarded_bytes = 0; |
a1d3c478 | 1826 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 1827 | |
e244a0ae | 1828 | |
5d4f98a2 | 1829 | /* Tell the block device(s) that the sectors can be discarded */ |
3ec706c8 | 1830 | ret = btrfs_map_block(root->fs_info, REQ_DISCARD, |
a1d3c478 | 1831 | bytenr, &num_bytes, &bbio, 0); |
79787eaa | 1832 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 1833 | if (!ret) { |
a1d3c478 | 1834 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
1835 | int i; |
1836 | ||
5d4f98a2 | 1837 | |
a1d3c478 | 1838 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d5e2003c JB |
1839 | if (!stripe->dev->can_discard) |
1840 | continue; | |
1841 | ||
5378e607 LD |
1842 | ret = btrfs_issue_discard(stripe->dev->bdev, |
1843 | stripe->physical, | |
1844 | stripe->length); | |
1845 | if (!ret) | |
1846 | discarded_bytes += stripe->length; | |
1847 | else if (ret != -EOPNOTSUPP) | |
79787eaa | 1848 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
1849 | |
1850 | /* | |
1851 | * Just in case we get back EOPNOTSUPP for some reason, | |
1852 | * just ignore the return value so we don't screw up | |
1853 | * people calling discard_extent. | |
1854 | */ | |
1855 | ret = 0; | |
5d4f98a2 | 1856 | } |
a1d3c478 | 1857 | kfree(bbio); |
5d4f98a2 | 1858 | } |
5378e607 LD |
1859 | |
1860 | if (actual_bytes) | |
1861 | *actual_bytes = discarded_bytes; | |
1862 | ||
5d4f98a2 | 1863 | |
53b381b3 DW |
1864 | if (ret == -EOPNOTSUPP) |
1865 | ret = 0; | |
5d4f98a2 | 1866 | return ret; |
5d4f98a2 YZ |
1867 | } |
1868 | ||
79787eaa | 1869 | /* Can return -ENOMEM */ |
5d4f98a2 YZ |
1870 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1871 | struct btrfs_root *root, | |
1872 | u64 bytenr, u64 num_bytes, u64 parent, | |
66d7e7f0 | 1873 | u64 root_objectid, u64 owner, u64 offset, int for_cow) |
5d4f98a2 YZ |
1874 | { |
1875 | int ret; | |
66d7e7f0 AJ |
1876 | struct btrfs_fs_info *fs_info = root->fs_info; |
1877 | ||
5d4f98a2 YZ |
1878 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
1879 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
1880 | ||
1881 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
66d7e7f0 AJ |
1882 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
1883 | num_bytes, | |
5d4f98a2 | 1884 | parent, root_objectid, (int)owner, |
66d7e7f0 | 1885 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 1886 | } else { |
66d7e7f0 AJ |
1887 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
1888 | num_bytes, | |
5d4f98a2 | 1889 | parent, root_objectid, owner, offset, |
66d7e7f0 | 1890 | BTRFS_ADD_DELAYED_REF, NULL, for_cow); |
5d4f98a2 YZ |
1891 | } |
1892 | return ret; | |
1893 | } | |
1894 | ||
1895 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | |
1896 | struct btrfs_root *root, | |
1897 | u64 bytenr, u64 num_bytes, | |
1898 | u64 parent, u64 root_objectid, | |
1899 | u64 owner, u64 offset, int refs_to_add, | |
1900 | struct btrfs_delayed_extent_op *extent_op) | |
1901 | { | |
1902 | struct btrfs_path *path; | |
1903 | struct extent_buffer *leaf; | |
1904 | struct btrfs_extent_item *item; | |
1905 | u64 refs; | |
1906 | int ret; | |
1907 | int err = 0; | |
1908 | ||
1909 | path = btrfs_alloc_path(); | |
1910 | if (!path) | |
1911 | return -ENOMEM; | |
1912 | ||
1913 | path->reada = 1; | |
1914 | path->leave_spinning = 1; | |
1915 | /* this will setup the path even if it fails to insert the back ref */ | |
1916 | ret = insert_inline_extent_backref(trans, root->fs_info->extent_root, | |
1917 | path, bytenr, num_bytes, parent, | |
1918 | root_objectid, owner, offset, | |
1919 | refs_to_add, extent_op); | |
1920 | if (ret == 0) | |
1921 | goto out; | |
1922 | ||
1923 | if (ret != -EAGAIN) { | |
1924 | err = ret; | |
1925 | goto out; | |
1926 | } | |
1927 | ||
1928 | leaf = path->nodes[0]; | |
1929 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1930 | refs = btrfs_extent_refs(leaf, item); | |
1931 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
1932 | if (extent_op) | |
1933 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 1934 | |
5d4f98a2 | 1935 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 1936 | btrfs_release_path(path); |
56bec294 CM |
1937 | |
1938 | path->reada = 1; | |
b9473439 CM |
1939 | path->leave_spinning = 1; |
1940 | ||
56bec294 CM |
1941 | /* now insert the actual backref */ |
1942 | ret = insert_extent_backref(trans, root->fs_info->extent_root, | |
5d4f98a2 YZ |
1943 | path, bytenr, parent, root_objectid, |
1944 | owner, offset, refs_to_add); | |
79787eaa JM |
1945 | if (ret) |
1946 | btrfs_abort_transaction(trans, root, ret); | |
5d4f98a2 | 1947 | out: |
56bec294 | 1948 | btrfs_free_path(path); |
5d4f98a2 | 1949 | return err; |
56bec294 CM |
1950 | } |
1951 | ||
5d4f98a2 YZ |
1952 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
1953 | struct btrfs_root *root, | |
1954 | struct btrfs_delayed_ref_node *node, | |
1955 | struct btrfs_delayed_extent_op *extent_op, | |
1956 | int insert_reserved) | |
56bec294 | 1957 | { |
5d4f98a2 YZ |
1958 | int ret = 0; |
1959 | struct btrfs_delayed_data_ref *ref; | |
1960 | struct btrfs_key ins; | |
1961 | u64 parent = 0; | |
1962 | u64 ref_root = 0; | |
1963 | u64 flags = 0; | |
1964 | ||
1965 | ins.objectid = node->bytenr; | |
1966 | ins.offset = node->num_bytes; | |
1967 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
1968 | ||
1969 | ref = btrfs_delayed_node_to_data_ref(node); | |
1970 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) | |
1971 | parent = ref->parent; | |
1972 | else | |
1973 | ref_root = ref->root; | |
1974 | ||
1975 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
1976 | if (extent_op) { | |
1977 | BUG_ON(extent_op->update_key); | |
1978 | flags |= extent_op->flags_to_set; | |
1979 | } | |
1980 | ret = alloc_reserved_file_extent(trans, root, | |
1981 | parent, ref_root, flags, | |
1982 | ref->objectid, ref->offset, | |
1983 | &ins, node->ref_mod); | |
5d4f98a2 YZ |
1984 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
1985 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
1986 | node->num_bytes, parent, | |
1987 | ref_root, ref->objectid, | |
1988 | ref->offset, node->ref_mod, | |
1989 | extent_op); | |
1990 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
1991 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
1992 | node->num_bytes, parent, | |
1993 | ref_root, ref->objectid, | |
1994 | ref->offset, node->ref_mod, | |
1995 | extent_op); | |
1996 | } else { | |
1997 | BUG(); | |
1998 | } | |
1999 | return ret; | |
2000 | } | |
2001 | ||
2002 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2003 | struct extent_buffer *leaf, | |
2004 | struct btrfs_extent_item *ei) | |
2005 | { | |
2006 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2007 | if (extent_op->update_flags) { | |
2008 | flags |= extent_op->flags_to_set; | |
2009 | btrfs_set_extent_flags(leaf, ei, flags); | |
2010 | } | |
2011 | ||
2012 | if (extent_op->update_key) { | |
2013 | struct btrfs_tree_block_info *bi; | |
2014 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2015 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2016 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2017 | } | |
2018 | } | |
2019 | ||
2020 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2021 | struct btrfs_root *root, | |
2022 | struct btrfs_delayed_ref_node *node, | |
2023 | struct btrfs_delayed_extent_op *extent_op) | |
2024 | { | |
2025 | struct btrfs_key key; | |
2026 | struct btrfs_path *path; | |
2027 | struct btrfs_extent_item *ei; | |
2028 | struct extent_buffer *leaf; | |
2029 | u32 item_size; | |
56bec294 | 2030 | int ret; |
5d4f98a2 YZ |
2031 | int err = 0; |
2032 | ||
79787eaa JM |
2033 | if (trans->aborted) |
2034 | return 0; | |
2035 | ||
5d4f98a2 YZ |
2036 | path = btrfs_alloc_path(); |
2037 | if (!path) | |
2038 | return -ENOMEM; | |
2039 | ||
2040 | key.objectid = node->bytenr; | |
2041 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2042 | key.offset = node->num_bytes; | |
2043 | ||
2044 | path->reada = 1; | |
2045 | path->leave_spinning = 1; | |
2046 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, | |
2047 | path, 0, 1); | |
2048 | if (ret < 0) { | |
2049 | err = ret; | |
2050 | goto out; | |
2051 | } | |
2052 | if (ret > 0) { | |
2053 | err = -EIO; | |
2054 | goto out; | |
2055 | } | |
2056 | ||
2057 | leaf = path->nodes[0]; | |
2058 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2059 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2060 | if (item_size < sizeof(*ei)) { | |
2061 | ret = convert_extent_item_v0(trans, root->fs_info->extent_root, | |
2062 | path, (u64)-1, 0); | |
2063 | if (ret < 0) { | |
2064 | err = ret; | |
2065 | goto out; | |
2066 | } | |
2067 | leaf = path->nodes[0]; | |
2068 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2069 | } | |
2070 | #endif | |
2071 | BUG_ON(item_size < sizeof(*ei)); | |
2072 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2073 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2074 | |
5d4f98a2 YZ |
2075 | btrfs_mark_buffer_dirty(leaf); |
2076 | out: | |
2077 | btrfs_free_path(path); | |
2078 | return err; | |
56bec294 CM |
2079 | } |
2080 | ||
5d4f98a2 YZ |
2081 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2082 | struct btrfs_root *root, | |
2083 | struct btrfs_delayed_ref_node *node, | |
2084 | struct btrfs_delayed_extent_op *extent_op, | |
2085 | int insert_reserved) | |
56bec294 CM |
2086 | { |
2087 | int ret = 0; | |
5d4f98a2 YZ |
2088 | struct btrfs_delayed_tree_ref *ref; |
2089 | struct btrfs_key ins; | |
2090 | u64 parent = 0; | |
2091 | u64 ref_root = 0; | |
56bec294 | 2092 | |
5d4f98a2 YZ |
2093 | ins.objectid = node->bytenr; |
2094 | ins.offset = node->num_bytes; | |
2095 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
56bec294 | 2096 | |
5d4f98a2 YZ |
2097 | ref = btrfs_delayed_node_to_tree_ref(node); |
2098 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2099 | parent = ref->parent; | |
2100 | else | |
2101 | ref_root = ref->root; | |
2102 | ||
2103 | BUG_ON(node->ref_mod != 1); | |
2104 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
2105 | BUG_ON(!extent_op || !extent_op->update_flags || | |
2106 | !extent_op->update_key); | |
2107 | ret = alloc_reserved_tree_block(trans, root, | |
2108 | parent, ref_root, | |
2109 | extent_op->flags_to_set, | |
2110 | &extent_op->key, | |
2111 | ref->level, &ins); | |
5d4f98a2 YZ |
2112 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2113 | ret = __btrfs_inc_extent_ref(trans, root, node->bytenr, | |
2114 | node->num_bytes, parent, ref_root, | |
2115 | ref->level, 0, 1, extent_op); | |
2116 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { | |
2117 | ret = __btrfs_free_extent(trans, root, node->bytenr, | |
2118 | node->num_bytes, parent, ref_root, | |
2119 | ref->level, 0, 1, extent_op); | |
2120 | } else { | |
2121 | BUG(); | |
2122 | } | |
56bec294 CM |
2123 | return ret; |
2124 | } | |
2125 | ||
2126 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 YZ |
2127 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2128 | struct btrfs_root *root, | |
2129 | struct btrfs_delayed_ref_node *node, | |
2130 | struct btrfs_delayed_extent_op *extent_op, | |
2131 | int insert_reserved) | |
56bec294 | 2132 | { |
79787eaa JM |
2133 | int ret = 0; |
2134 | ||
2135 | if (trans->aborted) | |
2136 | return 0; | |
2137 | ||
5d4f98a2 | 2138 | if (btrfs_delayed_ref_is_head(node)) { |
56bec294 CM |
2139 | struct btrfs_delayed_ref_head *head; |
2140 | /* | |
2141 | * we've hit the end of the chain and we were supposed | |
2142 | * to insert this extent into the tree. But, it got | |
2143 | * deleted before we ever needed to insert it, so all | |
2144 | * we have to do is clean up the accounting | |
2145 | */ | |
5d4f98a2 YZ |
2146 | BUG_ON(extent_op); |
2147 | head = btrfs_delayed_node_to_head(node); | |
56bec294 | 2148 | if (insert_reserved) { |
f0486c68 YZ |
2149 | btrfs_pin_extent(root, node->bytenr, |
2150 | node->num_bytes, 1); | |
5d4f98a2 YZ |
2151 | if (head->is_data) { |
2152 | ret = btrfs_del_csums(trans, root, | |
2153 | node->bytenr, | |
2154 | node->num_bytes); | |
5d4f98a2 | 2155 | } |
56bec294 | 2156 | } |
79787eaa | 2157 | return ret; |
56bec294 CM |
2158 | } |
2159 | ||
5d4f98a2 YZ |
2160 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2161 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2162 | ret = run_delayed_tree_ref(trans, root, node, extent_op, | |
2163 | insert_reserved); | |
2164 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2165 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2166 | ret = run_delayed_data_ref(trans, root, node, extent_op, | |
2167 | insert_reserved); | |
2168 | else | |
2169 | BUG(); | |
2170 | return ret; | |
56bec294 CM |
2171 | } |
2172 | ||
2173 | static noinline struct btrfs_delayed_ref_node * | |
2174 | select_delayed_ref(struct btrfs_delayed_ref_head *head) | |
2175 | { | |
2176 | struct rb_node *node; | |
2177 | struct btrfs_delayed_ref_node *ref; | |
2178 | int action = BTRFS_ADD_DELAYED_REF; | |
2179 | again: | |
2180 | /* | |
2181 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2182 | * this prevents ref count from going down to zero when | |
2183 | * there still are pending delayed ref. | |
2184 | */ | |
2185 | node = rb_prev(&head->node.rb_node); | |
2186 | while (1) { | |
2187 | if (!node) | |
2188 | break; | |
2189 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2190 | rb_node); | |
2191 | if (ref->bytenr != head->node.bytenr) | |
2192 | break; | |
5d4f98a2 | 2193 | if (ref->action == action) |
56bec294 CM |
2194 | return ref; |
2195 | node = rb_prev(node); | |
2196 | } | |
2197 | if (action == BTRFS_ADD_DELAYED_REF) { | |
2198 | action = BTRFS_DROP_DELAYED_REF; | |
2199 | goto again; | |
2200 | } | |
2201 | return NULL; | |
2202 | } | |
2203 | ||
79787eaa JM |
2204 | /* |
2205 | * Returns 0 on success or if called with an already aborted transaction. | |
2206 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2207 | */ | |
c3e69d58 CM |
2208 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
2209 | struct btrfs_root *root, | |
2210 | struct list_head *cluster) | |
56bec294 | 2211 | { |
56bec294 CM |
2212 | struct btrfs_delayed_ref_root *delayed_refs; |
2213 | struct btrfs_delayed_ref_node *ref; | |
2214 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2215 | struct btrfs_delayed_extent_op *extent_op; |
097b8a7c | 2216 | struct btrfs_fs_info *fs_info = root->fs_info; |
56bec294 | 2217 | int ret; |
c3e69d58 | 2218 | int count = 0; |
56bec294 | 2219 | int must_insert_reserved = 0; |
56bec294 CM |
2220 | |
2221 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2222 | while (1) { |
2223 | if (!locked_ref) { | |
c3e69d58 CM |
2224 | /* pick a new head ref from the cluster list */ |
2225 | if (list_empty(cluster)) | |
56bec294 | 2226 | break; |
56bec294 | 2227 | |
c3e69d58 CM |
2228 | locked_ref = list_entry(cluster->next, |
2229 | struct btrfs_delayed_ref_head, cluster); | |
2230 | ||
2231 | /* grab the lock that says we are going to process | |
2232 | * all the refs for this head */ | |
2233 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
2234 | ||
2235 | /* | |
2236 | * we may have dropped the spin lock to get the head | |
2237 | * mutex lock, and that might have given someone else | |
2238 | * time to free the head. If that's true, it has been | |
2239 | * removed from our list and we can move on. | |
2240 | */ | |
2241 | if (ret == -EAGAIN) { | |
2242 | locked_ref = NULL; | |
2243 | count++; | |
2244 | continue; | |
56bec294 CM |
2245 | } |
2246 | } | |
a28ec197 | 2247 | |
ae1e206b JB |
2248 | /* |
2249 | * We need to try and merge add/drops of the same ref since we | |
2250 | * can run into issues with relocate dropping the implicit ref | |
2251 | * and then it being added back again before the drop can | |
2252 | * finish. If we merged anything we need to re-loop so we can | |
2253 | * get a good ref. | |
2254 | */ | |
2255 | btrfs_merge_delayed_refs(trans, fs_info, delayed_refs, | |
2256 | locked_ref); | |
2257 | ||
d1270cd9 AJ |
2258 | /* |
2259 | * locked_ref is the head node, so we have to go one | |
2260 | * node back for any delayed ref updates | |
2261 | */ | |
2262 | ref = select_delayed_ref(locked_ref); | |
2263 | ||
2264 | if (ref && ref->seq && | |
097b8a7c | 2265 | btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) { |
d1270cd9 AJ |
2266 | /* |
2267 | * there are still refs with lower seq numbers in the | |
2268 | * process of being added. Don't run this ref yet. | |
2269 | */ | |
2270 | list_del_init(&locked_ref->cluster); | |
093486c4 | 2271 | btrfs_delayed_ref_unlock(locked_ref); |
d1270cd9 AJ |
2272 | locked_ref = NULL; |
2273 | delayed_refs->num_heads_ready++; | |
2274 | spin_unlock(&delayed_refs->lock); | |
2275 | cond_resched(); | |
2276 | spin_lock(&delayed_refs->lock); | |
2277 | continue; | |
2278 | } | |
2279 | ||
56bec294 CM |
2280 | /* |
2281 | * record the must insert reserved flag before we | |
2282 | * drop the spin lock. | |
2283 | */ | |
2284 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2285 | locked_ref->must_insert_reserved = 0; | |
7bb86316 | 2286 | |
5d4f98a2 YZ |
2287 | extent_op = locked_ref->extent_op; |
2288 | locked_ref->extent_op = NULL; | |
2289 | ||
56bec294 CM |
2290 | if (!ref) { |
2291 | /* All delayed refs have been processed, Go ahead | |
2292 | * and send the head node to run_one_delayed_ref, | |
2293 | * so that any accounting fixes can happen | |
2294 | */ | |
2295 | ref = &locked_ref->node; | |
5d4f98a2 YZ |
2296 | |
2297 | if (extent_op && must_insert_reserved) { | |
78a6184a | 2298 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2299 | extent_op = NULL; |
2300 | } | |
2301 | ||
2302 | if (extent_op) { | |
2303 | spin_unlock(&delayed_refs->lock); | |
2304 | ||
2305 | ret = run_delayed_extent_op(trans, root, | |
2306 | ref, extent_op); | |
78a6184a | 2307 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 | 2308 | |
79787eaa | 2309 | if (ret) { |
093486c4 MX |
2310 | printk(KERN_DEBUG |
2311 | "btrfs: run_delayed_extent_op " | |
2312 | "returned %d\n", ret); | |
253beebd | 2313 | spin_lock(&delayed_refs->lock); |
093486c4 | 2314 | btrfs_delayed_ref_unlock(locked_ref); |
79787eaa JM |
2315 | return ret; |
2316 | } | |
2317 | ||
203bf287 | 2318 | goto next; |
5d4f98a2 | 2319 | } |
56bec294 | 2320 | } |
02217ed2 | 2321 | |
56bec294 CM |
2322 | ref->in_tree = 0; |
2323 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2324 | delayed_refs->num_entries--; | |
093486c4 | 2325 | if (!btrfs_delayed_ref_is_head(ref)) { |
22cd2e7d AJ |
2326 | /* |
2327 | * when we play the delayed ref, also correct the | |
2328 | * ref_mod on head | |
2329 | */ | |
2330 | switch (ref->action) { | |
2331 | case BTRFS_ADD_DELAYED_REF: | |
2332 | case BTRFS_ADD_DELAYED_EXTENT: | |
2333 | locked_ref->node.ref_mod -= ref->ref_mod; | |
2334 | break; | |
2335 | case BTRFS_DROP_DELAYED_REF: | |
2336 | locked_ref->node.ref_mod += ref->ref_mod; | |
2337 | break; | |
2338 | default: | |
2339 | WARN_ON(1); | |
2340 | } | |
2341 | } | |
56bec294 | 2342 | spin_unlock(&delayed_refs->lock); |
925baedd | 2343 | |
5d4f98a2 | 2344 | ret = run_one_delayed_ref(trans, root, ref, extent_op, |
56bec294 | 2345 | must_insert_reserved); |
eb099670 | 2346 | |
78a6184a | 2347 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2348 | if (ret) { |
093486c4 MX |
2349 | btrfs_delayed_ref_unlock(locked_ref); |
2350 | btrfs_put_delayed_ref(ref); | |
2351 | printk(KERN_DEBUG | |
2352 | "btrfs: run_one_delayed_ref returned %d\n", ret); | |
253beebd | 2353 | spin_lock(&delayed_refs->lock); |
79787eaa JM |
2354 | return ret; |
2355 | } | |
2356 | ||
093486c4 MX |
2357 | /* |
2358 | * If this node is a head, that means all the refs in this head | |
2359 | * have been dealt with, and we will pick the next head to deal | |
2360 | * with, so we must unlock the head and drop it from the cluster | |
2361 | * list before we release it. | |
2362 | */ | |
2363 | if (btrfs_delayed_ref_is_head(ref)) { | |
2364 | list_del_init(&locked_ref->cluster); | |
2365 | btrfs_delayed_ref_unlock(locked_ref); | |
2366 | locked_ref = NULL; | |
2367 | } | |
2368 | btrfs_put_delayed_ref(ref); | |
2369 | count++; | |
203bf287 | 2370 | next: |
c3e69d58 CM |
2371 | cond_resched(); |
2372 | spin_lock(&delayed_refs->lock); | |
2373 | } | |
2374 | return count; | |
2375 | } | |
2376 | ||
709c0486 AJ |
2377 | #ifdef SCRAMBLE_DELAYED_REFS |
2378 | /* | |
2379 | * Normally delayed refs get processed in ascending bytenr order. This | |
2380 | * correlates in most cases to the order added. To expose dependencies on this | |
2381 | * order, we start to process the tree in the middle instead of the beginning | |
2382 | */ | |
2383 | static u64 find_middle(struct rb_root *root) | |
2384 | { | |
2385 | struct rb_node *n = root->rb_node; | |
2386 | struct btrfs_delayed_ref_node *entry; | |
2387 | int alt = 1; | |
2388 | u64 middle; | |
2389 | u64 first = 0, last = 0; | |
2390 | ||
2391 | n = rb_first(root); | |
2392 | if (n) { | |
2393 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2394 | first = entry->bytenr; | |
2395 | } | |
2396 | n = rb_last(root); | |
2397 | if (n) { | |
2398 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2399 | last = entry->bytenr; | |
2400 | } | |
2401 | n = root->rb_node; | |
2402 | ||
2403 | while (n) { | |
2404 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2405 | WARN_ON(!entry->in_tree); | |
2406 | ||
2407 | middle = entry->bytenr; | |
2408 | ||
2409 | if (alt) | |
2410 | n = n->rb_left; | |
2411 | else | |
2412 | n = n->rb_right; | |
2413 | ||
2414 | alt = 1 - alt; | |
2415 | } | |
2416 | return middle; | |
2417 | } | |
2418 | #endif | |
2419 | ||
bed92eae AJ |
2420 | int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, |
2421 | struct btrfs_fs_info *fs_info) | |
2422 | { | |
2423 | struct qgroup_update *qgroup_update; | |
2424 | int ret = 0; | |
2425 | ||
2426 | if (list_empty(&trans->qgroup_ref_list) != | |
2427 | !trans->delayed_ref_elem.seq) { | |
2428 | /* list without seq or seq without list */ | |
2429 | printk(KERN_ERR "btrfs: qgroup accounting update error, list is%s empty, seq is %llu\n", | |
2430 | list_empty(&trans->qgroup_ref_list) ? "" : " not", | |
2431 | trans->delayed_ref_elem.seq); | |
2432 | BUG(); | |
2433 | } | |
2434 | ||
2435 | if (!trans->delayed_ref_elem.seq) | |
2436 | return 0; | |
2437 | ||
2438 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2439 | qgroup_update = list_first_entry(&trans->qgroup_ref_list, | |
2440 | struct qgroup_update, list); | |
2441 | list_del(&qgroup_update->list); | |
2442 | if (!ret) | |
2443 | ret = btrfs_qgroup_account_ref( | |
2444 | trans, fs_info, qgroup_update->node, | |
2445 | qgroup_update->extent_op); | |
2446 | kfree(qgroup_update); | |
2447 | } | |
2448 | ||
2449 | btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem); | |
2450 | ||
2451 | return ret; | |
2452 | } | |
2453 | ||
bb721703 CM |
2454 | static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq, |
2455 | int count) | |
2456 | { | |
2457 | int val = atomic_read(&delayed_refs->ref_seq); | |
2458 | ||
2459 | if (val < seq || val >= seq + count) | |
2460 | return 1; | |
2461 | return 0; | |
2462 | } | |
2463 | ||
c3e69d58 CM |
2464 | /* |
2465 | * this starts processing the delayed reference count updates and | |
2466 | * extent insertions we have queued up so far. count can be | |
2467 | * 0, which means to process everything in the tree at the start | |
2468 | * of the run (but not newly added entries), or it can be some target | |
2469 | * number you'd like to process. | |
79787eaa JM |
2470 | * |
2471 | * Returns 0 on success or if called with an aborted transaction | |
2472 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
2473 | */ |
2474 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
2475 | struct btrfs_root *root, unsigned long count) | |
2476 | { | |
2477 | struct rb_node *node; | |
2478 | struct btrfs_delayed_ref_root *delayed_refs; | |
2479 | struct btrfs_delayed_ref_node *ref; | |
2480 | struct list_head cluster; | |
2481 | int ret; | |
a168650c | 2482 | u64 delayed_start; |
c3e69d58 CM |
2483 | int run_all = count == (unsigned long)-1; |
2484 | int run_most = 0; | |
1fa11e26 | 2485 | int loops; |
c3e69d58 | 2486 | |
79787eaa JM |
2487 | /* We'll clean this up in btrfs_cleanup_transaction */ |
2488 | if (trans->aborted) | |
2489 | return 0; | |
2490 | ||
c3e69d58 CM |
2491 | if (root == root->fs_info->extent_root) |
2492 | root = root->fs_info->tree_root; | |
2493 | ||
edf39272 JS |
2494 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
2495 | ||
c3e69d58 CM |
2496 | delayed_refs = &trans->transaction->delayed_refs; |
2497 | INIT_LIST_HEAD(&cluster); | |
bb721703 CM |
2498 | if (count == 0) { |
2499 | count = delayed_refs->num_entries * 2; | |
2500 | run_most = 1; | |
2501 | } | |
2502 | ||
2503 | if (!run_all && !run_most) { | |
2504 | int old; | |
2505 | int seq = atomic_read(&delayed_refs->ref_seq); | |
2506 | ||
2507 | progress: | |
2508 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2509 | if (old) { | |
2510 | DEFINE_WAIT(__wait); | |
2511 | if (delayed_refs->num_entries < 16348) | |
2512 | return 0; | |
2513 | ||
2514 | prepare_to_wait(&delayed_refs->wait, &__wait, | |
2515 | TASK_UNINTERRUPTIBLE); | |
2516 | ||
2517 | old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1); | |
2518 | if (old) { | |
2519 | schedule(); | |
2520 | finish_wait(&delayed_refs->wait, &__wait); | |
2521 | ||
2522 | if (!refs_newer(delayed_refs, seq, 256)) | |
2523 | goto progress; | |
2524 | else | |
2525 | return 0; | |
2526 | } else { | |
2527 | finish_wait(&delayed_refs->wait, &__wait); | |
2528 | goto again; | |
2529 | } | |
2530 | } | |
2531 | ||
2532 | } else { | |
2533 | atomic_inc(&delayed_refs->procs_running_refs); | |
2534 | } | |
2535 | ||
c3e69d58 | 2536 | again: |
1fa11e26 | 2537 | loops = 0; |
c3e69d58 | 2538 | spin_lock(&delayed_refs->lock); |
097b8a7c | 2539 | |
709c0486 AJ |
2540 | #ifdef SCRAMBLE_DELAYED_REFS |
2541 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
2542 | #endif | |
2543 | ||
c3e69d58 CM |
2544 | while (1) { |
2545 | if (!(run_all || run_most) && | |
2546 | delayed_refs->num_heads_ready < 64) | |
2547 | break; | |
eb099670 | 2548 | |
56bec294 | 2549 | /* |
c3e69d58 CM |
2550 | * go find something we can process in the rbtree. We start at |
2551 | * the beginning of the tree, and then build a cluster | |
2552 | * of refs to process starting at the first one we are able to | |
2553 | * lock | |
56bec294 | 2554 | */ |
a168650c | 2555 | delayed_start = delayed_refs->run_delayed_start; |
c3e69d58 CM |
2556 | ret = btrfs_find_ref_cluster(trans, &cluster, |
2557 | delayed_refs->run_delayed_start); | |
2558 | if (ret) | |
56bec294 CM |
2559 | break; |
2560 | ||
c3e69d58 | 2561 | ret = run_clustered_refs(trans, root, &cluster); |
79787eaa | 2562 | if (ret < 0) { |
093486c4 | 2563 | btrfs_release_ref_cluster(&cluster); |
79787eaa JM |
2564 | spin_unlock(&delayed_refs->lock); |
2565 | btrfs_abort_transaction(trans, root, ret); | |
bb721703 | 2566 | atomic_dec(&delayed_refs->procs_running_refs); |
79787eaa JM |
2567 | return ret; |
2568 | } | |
c3e69d58 | 2569 | |
bb721703 CM |
2570 | atomic_add(ret, &delayed_refs->ref_seq); |
2571 | ||
c3e69d58 CM |
2572 | count -= min_t(unsigned long, ret, count); |
2573 | ||
2574 | if (count == 0) | |
2575 | break; | |
a168650c | 2576 | |
1fa11e26 AJ |
2577 | if (delayed_start >= delayed_refs->run_delayed_start) { |
2578 | if (loops == 0) { | |
2579 | /* | |
2580 | * btrfs_find_ref_cluster looped. let's do one | |
2581 | * more cycle. if we don't run any delayed ref | |
2582 | * during that cycle (because we can't because | |
2583 | * all of them are blocked), bail out. | |
2584 | */ | |
2585 | loops = 1; | |
2586 | } else { | |
2587 | /* | |
2588 | * no runnable refs left, stop trying | |
2589 | */ | |
2590 | BUG_ON(run_all); | |
2591 | break; | |
2592 | } | |
2593 | } | |
2594 | if (ret) { | |
a168650c | 2595 | /* refs were run, let's reset staleness detection */ |
1fa11e26 | 2596 | loops = 0; |
a168650c | 2597 | } |
eb099670 | 2598 | } |
c3e69d58 | 2599 | |
56bec294 | 2600 | if (run_all) { |
ea658bad JB |
2601 | if (!list_empty(&trans->new_bgs)) { |
2602 | spin_unlock(&delayed_refs->lock); | |
2603 | btrfs_create_pending_block_groups(trans, root); | |
2604 | spin_lock(&delayed_refs->lock); | |
2605 | } | |
2606 | ||
56bec294 | 2607 | node = rb_first(&delayed_refs->root); |
c3e69d58 | 2608 | if (!node) |
56bec294 | 2609 | goto out; |
c3e69d58 | 2610 | count = (unsigned long)-1; |
e9d0b13b | 2611 | |
56bec294 CM |
2612 | while (node) { |
2613 | ref = rb_entry(node, struct btrfs_delayed_ref_node, | |
2614 | rb_node); | |
2615 | if (btrfs_delayed_ref_is_head(ref)) { | |
2616 | struct btrfs_delayed_ref_head *head; | |
5caf2a00 | 2617 | |
56bec294 CM |
2618 | head = btrfs_delayed_node_to_head(ref); |
2619 | atomic_inc(&ref->refs); | |
2620 | ||
2621 | spin_unlock(&delayed_refs->lock); | |
8cc33e5c DS |
2622 | /* |
2623 | * Mutex was contended, block until it's | |
2624 | * released and try again | |
2625 | */ | |
56bec294 CM |
2626 | mutex_lock(&head->mutex); |
2627 | mutex_unlock(&head->mutex); | |
2628 | ||
2629 | btrfs_put_delayed_ref(ref); | |
1887be66 | 2630 | cond_resched(); |
56bec294 CM |
2631 | goto again; |
2632 | } | |
2633 | node = rb_next(node); | |
2634 | } | |
2635 | spin_unlock(&delayed_refs->lock); | |
56bec294 CM |
2636 | schedule_timeout(1); |
2637 | goto again; | |
5f39d397 | 2638 | } |
54aa1f4d | 2639 | out: |
bb721703 CM |
2640 | atomic_dec(&delayed_refs->procs_running_refs); |
2641 | smp_mb(); | |
2642 | if (waitqueue_active(&delayed_refs->wait)) | |
2643 | wake_up(&delayed_refs->wait); | |
2644 | ||
c3e69d58 | 2645 | spin_unlock(&delayed_refs->lock); |
edf39272 | 2646 | assert_qgroups_uptodate(trans); |
a28ec197 CM |
2647 | return 0; |
2648 | } | |
2649 | ||
5d4f98a2 YZ |
2650 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2651 | struct btrfs_root *root, | |
2652 | u64 bytenr, u64 num_bytes, u64 flags, | |
2653 | int is_data) | |
2654 | { | |
2655 | struct btrfs_delayed_extent_op *extent_op; | |
2656 | int ret; | |
2657 | ||
78a6184a | 2658 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
2659 | if (!extent_op) |
2660 | return -ENOMEM; | |
2661 | ||
2662 | extent_op->flags_to_set = flags; | |
2663 | extent_op->update_flags = 1; | |
2664 | extent_op->update_key = 0; | |
2665 | extent_op->is_data = is_data ? 1 : 0; | |
2666 | ||
66d7e7f0 AJ |
2667 | ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr, |
2668 | num_bytes, extent_op); | |
5d4f98a2 | 2669 | if (ret) |
78a6184a | 2670 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
2671 | return ret; |
2672 | } | |
2673 | ||
2674 | static noinline int check_delayed_ref(struct btrfs_trans_handle *trans, | |
2675 | struct btrfs_root *root, | |
2676 | struct btrfs_path *path, | |
2677 | u64 objectid, u64 offset, u64 bytenr) | |
2678 | { | |
2679 | struct btrfs_delayed_ref_head *head; | |
2680 | struct btrfs_delayed_ref_node *ref; | |
2681 | struct btrfs_delayed_data_ref *data_ref; | |
2682 | struct btrfs_delayed_ref_root *delayed_refs; | |
2683 | struct rb_node *node; | |
2684 | int ret = 0; | |
2685 | ||
2686 | ret = -ENOENT; | |
2687 | delayed_refs = &trans->transaction->delayed_refs; | |
2688 | spin_lock(&delayed_refs->lock); | |
2689 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
2690 | if (!head) | |
2691 | goto out; | |
2692 | ||
2693 | if (!mutex_trylock(&head->mutex)) { | |
2694 | atomic_inc(&head->node.refs); | |
2695 | spin_unlock(&delayed_refs->lock); | |
2696 | ||
b3b4aa74 | 2697 | btrfs_release_path(path); |
5d4f98a2 | 2698 | |
8cc33e5c DS |
2699 | /* |
2700 | * Mutex was contended, block until it's released and let | |
2701 | * caller try again | |
2702 | */ | |
5d4f98a2 YZ |
2703 | mutex_lock(&head->mutex); |
2704 | mutex_unlock(&head->mutex); | |
2705 | btrfs_put_delayed_ref(&head->node); | |
2706 | return -EAGAIN; | |
2707 | } | |
2708 | ||
2709 | node = rb_prev(&head->node.rb_node); | |
2710 | if (!node) | |
2711 | goto out_unlock; | |
2712 | ||
2713 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2714 | ||
2715 | if (ref->bytenr != bytenr) | |
2716 | goto out_unlock; | |
2717 | ||
2718 | ret = 1; | |
2719 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) | |
2720 | goto out_unlock; | |
2721 | ||
2722 | data_ref = btrfs_delayed_node_to_data_ref(ref); | |
2723 | ||
2724 | node = rb_prev(node); | |
2725 | if (node) { | |
df57dbe6 LB |
2726 | int seq = ref->seq; |
2727 | ||
5d4f98a2 | 2728 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
df57dbe6 | 2729 | if (ref->bytenr == bytenr && ref->seq == seq) |
5d4f98a2 YZ |
2730 | goto out_unlock; |
2731 | } | |
2732 | ||
2733 | if (data_ref->root != root->root_key.objectid || | |
2734 | data_ref->objectid != objectid || data_ref->offset != offset) | |
2735 | goto out_unlock; | |
2736 | ||
2737 | ret = 0; | |
2738 | out_unlock: | |
2739 | mutex_unlock(&head->mutex); | |
2740 | out: | |
2741 | spin_unlock(&delayed_refs->lock); | |
2742 | return ret; | |
2743 | } | |
2744 | ||
2745 | static noinline int check_committed_ref(struct btrfs_trans_handle *trans, | |
2746 | struct btrfs_root *root, | |
2747 | struct btrfs_path *path, | |
2748 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d CM |
2749 | { |
2750 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
f321e491 | 2751 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
2752 | struct btrfs_extent_data_ref *ref; |
2753 | struct btrfs_extent_inline_ref *iref; | |
2754 | struct btrfs_extent_item *ei; | |
f321e491 | 2755 | struct btrfs_key key; |
5d4f98a2 | 2756 | u32 item_size; |
be20aa9d | 2757 | int ret; |
925baedd | 2758 | |
be20aa9d | 2759 | key.objectid = bytenr; |
31840ae1 | 2760 | key.offset = (u64)-1; |
f321e491 | 2761 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 2762 | |
be20aa9d CM |
2763 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
2764 | if (ret < 0) | |
2765 | goto out; | |
79787eaa | 2766 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
2767 | |
2768 | ret = -ENOENT; | |
2769 | if (path->slots[0] == 0) | |
31840ae1 | 2770 | goto out; |
be20aa9d | 2771 | |
31840ae1 | 2772 | path->slots[0]--; |
f321e491 | 2773 | leaf = path->nodes[0]; |
5d4f98a2 | 2774 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 2775 | |
5d4f98a2 | 2776 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 2777 | goto out; |
f321e491 | 2778 | |
5d4f98a2 YZ |
2779 | ret = 1; |
2780 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2781 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2782 | if (item_size < sizeof(*ei)) { | |
2783 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
2784 | goto out; | |
2785 | } | |
2786 | #endif | |
2787 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 2788 | |
5d4f98a2 YZ |
2789 | if (item_size != sizeof(*ei) + |
2790 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
2791 | goto out; | |
be20aa9d | 2792 | |
5d4f98a2 YZ |
2793 | if (btrfs_extent_generation(leaf, ei) <= |
2794 | btrfs_root_last_snapshot(&root->root_item)) | |
2795 | goto out; | |
2796 | ||
2797 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
2798 | if (btrfs_extent_inline_ref_type(leaf, iref) != | |
2799 | BTRFS_EXTENT_DATA_REF_KEY) | |
2800 | goto out; | |
2801 | ||
2802 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
2803 | if (btrfs_extent_refs(leaf, ei) != | |
2804 | btrfs_extent_data_ref_count(leaf, ref) || | |
2805 | btrfs_extent_data_ref_root(leaf, ref) != | |
2806 | root->root_key.objectid || | |
2807 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
2808 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
2809 | goto out; | |
2810 | ||
2811 | ret = 0; | |
2812 | out: | |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, | |
2817 | struct btrfs_root *root, | |
2818 | u64 objectid, u64 offset, u64 bytenr) | |
2819 | { | |
2820 | struct btrfs_path *path; | |
2821 | int ret; | |
2822 | int ret2; | |
2823 | ||
2824 | path = btrfs_alloc_path(); | |
2825 | if (!path) | |
2826 | return -ENOENT; | |
2827 | ||
2828 | do { | |
2829 | ret = check_committed_ref(trans, root, path, objectid, | |
2830 | offset, bytenr); | |
2831 | if (ret && ret != -ENOENT) | |
f321e491 | 2832 | goto out; |
80ff3856 | 2833 | |
5d4f98a2 YZ |
2834 | ret2 = check_delayed_ref(trans, root, path, objectid, |
2835 | offset, bytenr); | |
2836 | } while (ret2 == -EAGAIN); | |
2837 | ||
2838 | if (ret2 && ret2 != -ENOENT) { | |
2839 | ret = ret2; | |
2840 | goto out; | |
f321e491 | 2841 | } |
5d4f98a2 YZ |
2842 | |
2843 | if (ret != -ENOENT || ret2 != -ENOENT) | |
2844 | ret = 0; | |
be20aa9d | 2845 | out: |
80ff3856 | 2846 | btrfs_free_path(path); |
f0486c68 YZ |
2847 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
2848 | WARN_ON(ret > 0); | |
f321e491 | 2849 | return ret; |
be20aa9d | 2850 | } |
c5739bba | 2851 | |
5d4f98a2 | 2852 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 2853 | struct btrfs_root *root, |
5d4f98a2 | 2854 | struct extent_buffer *buf, |
66d7e7f0 | 2855 | int full_backref, int inc, int for_cow) |
31840ae1 ZY |
2856 | { |
2857 | u64 bytenr; | |
5d4f98a2 YZ |
2858 | u64 num_bytes; |
2859 | u64 parent; | |
31840ae1 | 2860 | u64 ref_root; |
31840ae1 | 2861 | u32 nritems; |
31840ae1 ZY |
2862 | struct btrfs_key key; |
2863 | struct btrfs_file_extent_item *fi; | |
2864 | int i; | |
2865 | int level; | |
2866 | int ret = 0; | |
31840ae1 | 2867 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
66d7e7f0 | 2868 | u64, u64, u64, u64, u64, u64, int); |
31840ae1 ZY |
2869 | |
2870 | ref_root = btrfs_header_owner(buf); | |
31840ae1 ZY |
2871 | nritems = btrfs_header_nritems(buf); |
2872 | level = btrfs_header_level(buf); | |
2873 | ||
5d4f98a2 YZ |
2874 | if (!root->ref_cows && level == 0) |
2875 | return 0; | |
31840ae1 | 2876 | |
5d4f98a2 YZ |
2877 | if (inc) |
2878 | process_func = btrfs_inc_extent_ref; | |
2879 | else | |
2880 | process_func = btrfs_free_extent; | |
31840ae1 | 2881 | |
5d4f98a2 YZ |
2882 | if (full_backref) |
2883 | parent = buf->start; | |
2884 | else | |
2885 | parent = 0; | |
2886 | ||
2887 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 2888 | if (level == 0) { |
5d4f98a2 | 2889 | btrfs_item_key_to_cpu(buf, &key, i); |
31840ae1 ZY |
2890 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
2891 | continue; | |
5d4f98a2 | 2892 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
2893 | struct btrfs_file_extent_item); |
2894 | if (btrfs_file_extent_type(buf, fi) == | |
2895 | BTRFS_FILE_EXTENT_INLINE) | |
2896 | continue; | |
2897 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
2898 | if (bytenr == 0) | |
2899 | continue; | |
5d4f98a2 YZ |
2900 | |
2901 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
2902 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
2903 | ret = process_func(trans, root, bytenr, num_bytes, | |
2904 | parent, ref_root, key.objectid, | |
66d7e7f0 | 2905 | key.offset, for_cow); |
31840ae1 ZY |
2906 | if (ret) |
2907 | goto fail; | |
2908 | } else { | |
5d4f98a2 YZ |
2909 | bytenr = btrfs_node_blockptr(buf, i); |
2910 | num_bytes = btrfs_level_size(root, level - 1); | |
2911 | ret = process_func(trans, root, bytenr, num_bytes, | |
66d7e7f0 AJ |
2912 | parent, ref_root, level - 1, 0, |
2913 | for_cow); | |
31840ae1 ZY |
2914 | if (ret) |
2915 | goto fail; | |
2916 | } | |
2917 | } | |
2918 | return 0; | |
2919 | fail: | |
5d4f98a2 YZ |
2920 | return ret; |
2921 | } | |
2922 | ||
2923 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 2924 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 2925 | { |
66d7e7f0 | 2926 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow); |
5d4f98a2 YZ |
2927 | } |
2928 | ||
2929 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
66d7e7f0 | 2930 | struct extent_buffer *buf, int full_backref, int for_cow) |
5d4f98a2 | 2931 | { |
66d7e7f0 | 2932 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow); |
31840ae1 ZY |
2933 | } |
2934 | ||
9078a3e1 CM |
2935 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2936 | struct btrfs_root *root, | |
2937 | struct btrfs_path *path, | |
2938 | struct btrfs_block_group_cache *cache) | |
2939 | { | |
2940 | int ret; | |
9078a3e1 | 2941 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
5f39d397 CM |
2942 | unsigned long bi; |
2943 | struct extent_buffer *leaf; | |
9078a3e1 | 2944 | |
9078a3e1 | 2945 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
2946 | if (ret < 0) |
2947 | goto fail; | |
79787eaa | 2948 | BUG_ON(ret); /* Corruption */ |
5f39d397 CM |
2949 | |
2950 | leaf = path->nodes[0]; | |
2951 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2952 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
2953 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 2954 | btrfs_release_path(path); |
54aa1f4d | 2955 | fail: |
79787eaa JM |
2956 | if (ret) { |
2957 | btrfs_abort_transaction(trans, root, ret); | |
9078a3e1 | 2958 | return ret; |
79787eaa | 2959 | } |
9078a3e1 CM |
2960 | return 0; |
2961 | ||
2962 | } | |
2963 | ||
4a8c9a62 YZ |
2964 | static struct btrfs_block_group_cache * |
2965 | next_block_group(struct btrfs_root *root, | |
2966 | struct btrfs_block_group_cache *cache) | |
2967 | { | |
2968 | struct rb_node *node; | |
2969 | spin_lock(&root->fs_info->block_group_cache_lock); | |
2970 | node = rb_next(&cache->cache_node); | |
2971 | btrfs_put_block_group(cache); | |
2972 | if (node) { | |
2973 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
2974 | cache_node); | |
11dfe35a | 2975 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
2976 | } else |
2977 | cache = NULL; | |
2978 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
2979 | return cache; | |
2980 | } | |
2981 | ||
0af3d00b JB |
2982 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
2983 | struct btrfs_trans_handle *trans, | |
2984 | struct btrfs_path *path) | |
2985 | { | |
2986 | struct btrfs_root *root = block_group->fs_info->tree_root; | |
2987 | struct inode *inode = NULL; | |
2988 | u64 alloc_hint = 0; | |
2b20982e | 2989 | int dcs = BTRFS_DC_ERROR; |
0af3d00b JB |
2990 | int num_pages = 0; |
2991 | int retries = 0; | |
2992 | int ret = 0; | |
2993 | ||
2994 | /* | |
2995 | * If this block group is smaller than 100 megs don't bother caching the | |
2996 | * block group. | |
2997 | */ | |
2998 | if (block_group->key.offset < (100 * 1024 * 1024)) { | |
2999 | spin_lock(&block_group->lock); | |
3000 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3001 | spin_unlock(&block_group->lock); | |
3002 | return 0; | |
3003 | } | |
3004 | ||
3005 | again: | |
3006 | inode = lookup_free_space_inode(root, block_group, path); | |
3007 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { | |
3008 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3009 | btrfs_release_path(path); |
0af3d00b JB |
3010 | goto out; |
3011 | } | |
3012 | ||
3013 | if (IS_ERR(inode)) { | |
3014 | BUG_ON(retries); | |
3015 | retries++; | |
3016 | ||
3017 | if (block_group->ro) | |
3018 | goto out_free; | |
3019 | ||
3020 | ret = create_free_space_inode(root, trans, block_group, path); | |
3021 | if (ret) | |
3022 | goto out_free; | |
3023 | goto again; | |
3024 | } | |
3025 | ||
5b0e95bf JB |
3026 | /* We've already setup this transaction, go ahead and exit */ |
3027 | if (block_group->cache_generation == trans->transid && | |
3028 | i_size_read(inode)) { | |
3029 | dcs = BTRFS_DC_SETUP; | |
3030 | goto out_put; | |
3031 | } | |
3032 | ||
0af3d00b JB |
3033 | /* |
3034 | * We want to set the generation to 0, that way if anything goes wrong | |
3035 | * from here on out we know not to trust this cache when we load up next | |
3036 | * time. | |
3037 | */ | |
3038 | BTRFS_I(inode)->generation = 0; | |
3039 | ret = btrfs_update_inode(trans, root, inode); | |
3040 | WARN_ON(ret); | |
3041 | ||
3042 | if (i_size_read(inode) > 0) { | |
3043 | ret = btrfs_truncate_free_space_cache(root, trans, path, | |
3044 | inode); | |
3045 | if (ret) | |
3046 | goto out_put; | |
3047 | } | |
3048 | ||
3049 | spin_lock(&block_group->lock); | |
cf7c1ef6 LB |
3050 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
3051 | !btrfs_test_opt(root, SPACE_CACHE)) { | |
3052 | /* | |
3053 | * don't bother trying to write stuff out _if_ | |
3054 | * a) we're not cached, | |
3055 | * b) we're with nospace_cache mount option. | |
3056 | */ | |
2b20982e | 3057 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3058 | spin_unlock(&block_group->lock); |
3059 | goto out_put; | |
3060 | } | |
3061 | spin_unlock(&block_group->lock); | |
3062 | ||
6fc823b1 JB |
3063 | /* |
3064 | * Try to preallocate enough space based on how big the block group is. | |
3065 | * Keep in mind this has to include any pinned space which could end up | |
3066 | * taking up quite a bit since it's not folded into the other space | |
3067 | * cache. | |
3068 | */ | |
3069 | num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024); | |
0af3d00b JB |
3070 | if (!num_pages) |
3071 | num_pages = 1; | |
3072 | ||
0af3d00b JB |
3073 | num_pages *= 16; |
3074 | num_pages *= PAGE_CACHE_SIZE; | |
3075 | ||
3076 | ret = btrfs_check_data_free_space(inode, num_pages); | |
3077 | if (ret) | |
3078 | goto out_put; | |
3079 | ||
3080 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3081 | num_pages, num_pages, | |
3082 | &alloc_hint); | |
2b20982e JB |
3083 | if (!ret) |
3084 | dcs = BTRFS_DC_SETUP; | |
0af3d00b | 3085 | btrfs_free_reserved_data_space(inode, num_pages); |
c09544e0 | 3086 | |
0af3d00b JB |
3087 | out_put: |
3088 | iput(inode); | |
3089 | out_free: | |
b3b4aa74 | 3090 | btrfs_release_path(path); |
0af3d00b JB |
3091 | out: |
3092 | spin_lock(&block_group->lock); | |
e65cbb94 | 3093 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3094 | block_group->cache_generation = trans->transid; |
2b20982e | 3095 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3096 | spin_unlock(&block_group->lock); |
3097 | ||
3098 | return ret; | |
3099 | } | |
3100 | ||
96b5179d CM |
3101 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
3102 | struct btrfs_root *root) | |
9078a3e1 | 3103 | { |
4a8c9a62 | 3104 | struct btrfs_block_group_cache *cache; |
9078a3e1 | 3105 | int err = 0; |
9078a3e1 | 3106 | struct btrfs_path *path; |
96b5179d | 3107 | u64 last = 0; |
9078a3e1 CM |
3108 | |
3109 | path = btrfs_alloc_path(); | |
3110 | if (!path) | |
3111 | return -ENOMEM; | |
3112 | ||
0af3d00b JB |
3113 | again: |
3114 | while (1) { | |
3115 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3116 | while (cache) { | |
3117 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3118 | break; | |
3119 | cache = next_block_group(root, cache); | |
3120 | } | |
3121 | if (!cache) { | |
3122 | if (last == 0) | |
3123 | break; | |
3124 | last = 0; | |
3125 | continue; | |
3126 | } | |
3127 | err = cache_save_setup(cache, trans, path); | |
3128 | last = cache->key.objectid + cache->key.offset; | |
3129 | btrfs_put_block_group(cache); | |
3130 | } | |
3131 | ||
d397712b | 3132 | while (1) { |
4a8c9a62 YZ |
3133 | if (last == 0) { |
3134 | err = btrfs_run_delayed_refs(trans, root, | |
3135 | (unsigned long)-1); | |
79787eaa JM |
3136 | if (err) /* File system offline */ |
3137 | goto out; | |
0f9dd46c | 3138 | } |
54aa1f4d | 3139 | |
4a8c9a62 YZ |
3140 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
3141 | while (cache) { | |
0af3d00b JB |
3142 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) { |
3143 | btrfs_put_block_group(cache); | |
3144 | goto again; | |
3145 | } | |
3146 | ||
4a8c9a62 YZ |
3147 | if (cache->dirty) |
3148 | break; | |
3149 | cache = next_block_group(root, cache); | |
3150 | } | |
3151 | if (!cache) { | |
3152 | if (last == 0) | |
3153 | break; | |
3154 | last = 0; | |
3155 | continue; | |
3156 | } | |
0f9dd46c | 3157 | |
0cb59c99 JB |
3158 | if (cache->disk_cache_state == BTRFS_DC_SETUP) |
3159 | cache->disk_cache_state = BTRFS_DC_NEED_WRITE; | |
e8569813 | 3160 | cache->dirty = 0; |
4a8c9a62 | 3161 | last = cache->key.objectid + cache->key.offset; |
0f9dd46c | 3162 | |
4a8c9a62 | 3163 | err = write_one_cache_group(trans, root, path, cache); |
79787eaa JM |
3164 | if (err) /* File system offline */ |
3165 | goto out; | |
3166 | ||
4a8c9a62 | 3167 | btrfs_put_block_group(cache); |
9078a3e1 | 3168 | } |
4a8c9a62 | 3169 | |
0cb59c99 JB |
3170 | while (1) { |
3171 | /* | |
3172 | * I don't think this is needed since we're just marking our | |
3173 | * preallocated extent as written, but just in case it can't | |
3174 | * hurt. | |
3175 | */ | |
3176 | if (last == 0) { | |
3177 | err = btrfs_run_delayed_refs(trans, root, | |
3178 | (unsigned long)-1); | |
79787eaa JM |
3179 | if (err) /* File system offline */ |
3180 | goto out; | |
0cb59c99 JB |
3181 | } |
3182 | ||
3183 | cache = btrfs_lookup_first_block_group(root->fs_info, last); | |
3184 | while (cache) { | |
3185 | /* | |
3186 | * Really this shouldn't happen, but it could if we | |
3187 | * couldn't write the entire preallocated extent and | |
3188 | * splitting the extent resulted in a new block. | |
3189 | */ | |
3190 | if (cache->dirty) { | |
3191 | btrfs_put_block_group(cache); | |
3192 | goto again; | |
3193 | } | |
3194 | if (cache->disk_cache_state == BTRFS_DC_NEED_WRITE) | |
3195 | break; | |
3196 | cache = next_block_group(root, cache); | |
3197 | } | |
3198 | if (!cache) { | |
3199 | if (last == 0) | |
3200 | break; | |
3201 | last = 0; | |
3202 | continue; | |
3203 | } | |
3204 | ||
79787eaa | 3205 | err = btrfs_write_out_cache(root, trans, cache, path); |
0cb59c99 JB |
3206 | |
3207 | /* | |
3208 | * If we didn't have an error then the cache state is still | |
3209 | * NEED_WRITE, so we can set it to WRITTEN. | |
3210 | */ | |
79787eaa | 3211 | if (!err && cache->disk_cache_state == BTRFS_DC_NEED_WRITE) |
0cb59c99 JB |
3212 | cache->disk_cache_state = BTRFS_DC_WRITTEN; |
3213 | last = cache->key.objectid + cache->key.offset; | |
3214 | btrfs_put_block_group(cache); | |
3215 | } | |
79787eaa | 3216 | out: |
0cb59c99 | 3217 | |
9078a3e1 | 3218 | btrfs_free_path(path); |
79787eaa | 3219 | return err; |
9078a3e1 CM |
3220 | } |
3221 | ||
d2fb3437 YZ |
3222 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
3223 | { | |
3224 | struct btrfs_block_group_cache *block_group; | |
3225 | int readonly = 0; | |
3226 | ||
3227 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); | |
3228 | if (!block_group || block_group->ro) | |
3229 | readonly = 1; | |
3230 | if (block_group) | |
fa9c0d79 | 3231 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3232 | return readonly; |
3233 | } | |
3234 | ||
593060d7 CM |
3235 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
3236 | u64 total_bytes, u64 bytes_used, | |
3237 | struct btrfs_space_info **space_info) | |
3238 | { | |
3239 | struct btrfs_space_info *found; | |
b742bb82 YZ |
3240 | int i; |
3241 | int factor; | |
3242 | ||
3243 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
3244 | BTRFS_BLOCK_GROUP_RAID10)) | |
3245 | factor = 2; | |
3246 | else | |
3247 | factor = 1; | |
593060d7 CM |
3248 | |
3249 | found = __find_space_info(info, flags); | |
3250 | if (found) { | |
25179201 | 3251 | spin_lock(&found->lock); |
593060d7 | 3252 | found->total_bytes += total_bytes; |
89a55897 | 3253 | found->disk_total += total_bytes * factor; |
593060d7 | 3254 | found->bytes_used += bytes_used; |
b742bb82 | 3255 | found->disk_used += bytes_used * factor; |
8f18cf13 | 3256 | found->full = 0; |
25179201 | 3257 | spin_unlock(&found->lock); |
593060d7 CM |
3258 | *space_info = found; |
3259 | return 0; | |
3260 | } | |
c146afad | 3261 | found = kzalloc(sizeof(*found), GFP_NOFS); |
593060d7 CM |
3262 | if (!found) |
3263 | return -ENOMEM; | |
3264 | ||
b742bb82 YZ |
3265 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) |
3266 | INIT_LIST_HEAD(&found->block_groups[i]); | |
80eb234a | 3267 | init_rwsem(&found->groups_sem); |
0f9dd46c | 3268 | spin_lock_init(&found->lock); |
52ba6929 | 3269 | found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; |
593060d7 | 3270 | found->total_bytes = total_bytes; |
89a55897 | 3271 | found->disk_total = total_bytes * factor; |
593060d7 | 3272 | found->bytes_used = bytes_used; |
b742bb82 | 3273 | found->disk_used = bytes_used * factor; |
593060d7 | 3274 | found->bytes_pinned = 0; |
e8569813 | 3275 | found->bytes_reserved = 0; |
c146afad | 3276 | found->bytes_readonly = 0; |
f0486c68 | 3277 | found->bytes_may_use = 0; |
593060d7 | 3278 | found->full = 0; |
0e4f8f88 | 3279 | found->force_alloc = CHUNK_ALLOC_NO_FORCE; |
6d74119f | 3280 | found->chunk_alloc = 0; |
fdb5effd JB |
3281 | found->flush = 0; |
3282 | init_waitqueue_head(&found->wait); | |
593060d7 | 3283 | *space_info = found; |
4184ea7f | 3284 | list_add_rcu(&found->list, &info->space_info); |
b4d7c3c9 LZ |
3285 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3286 | info->data_sinfo = found; | |
593060d7 CM |
3287 | return 0; |
3288 | } | |
3289 | ||
8790d502 CM |
3290 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
3291 | { | |
899c81ea ID |
3292 | u64 extra_flags = chunk_to_extended(flags) & |
3293 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 3294 | |
de98ced9 | 3295 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
3296 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
3297 | fs_info->avail_data_alloc_bits |= extra_flags; | |
3298 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3299 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
3300 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3301 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 3302 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 3303 | } |
593060d7 | 3304 | |
fc67c450 ID |
3305 | /* |
3306 | * returns target flags in extended format or 0 if restripe for this | |
3307 | * chunk_type is not in progress | |
c6664b42 ID |
3308 | * |
3309 | * should be called with either volume_mutex or balance_lock held | |
fc67c450 ID |
3310 | */ |
3311 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
3312 | { | |
3313 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3314 | u64 target = 0; | |
3315 | ||
fc67c450 ID |
3316 | if (!bctl) |
3317 | return 0; | |
3318 | ||
3319 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
3320 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3321 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
3322 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
3323 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3324 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
3325 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
3326 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
3327 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
3328 | } | |
3329 | ||
3330 | return target; | |
3331 | } | |
3332 | ||
a46d11a8 ID |
3333 | /* |
3334 | * @flags: available profiles in extended format (see ctree.h) | |
3335 | * | |
e4d8ec0f ID |
3336 | * Returns reduced profile in chunk format. If profile changing is in |
3337 | * progress (either running or paused) picks the target profile (if it's | |
3338 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 3339 | */ |
2b82032c | 3340 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 3341 | { |
cd02dca5 CM |
3342 | /* |
3343 | * we add in the count of missing devices because we want | |
3344 | * to make sure that any RAID levels on a degraded FS | |
3345 | * continue to be honored. | |
3346 | */ | |
3347 | u64 num_devices = root->fs_info->fs_devices->rw_devices + | |
3348 | root->fs_info->fs_devices->missing_devices; | |
fc67c450 | 3349 | u64 target; |
53b381b3 | 3350 | u64 tmp; |
a061fc8d | 3351 | |
fc67c450 ID |
3352 | /* |
3353 | * see if restripe for this chunk_type is in progress, if so | |
3354 | * try to reduce to the target profile | |
3355 | */ | |
e4d8ec0f | 3356 | spin_lock(&root->fs_info->balance_lock); |
fc67c450 ID |
3357 | target = get_restripe_target(root->fs_info, flags); |
3358 | if (target) { | |
3359 | /* pick target profile only if it's already available */ | |
3360 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
e4d8ec0f | 3361 | spin_unlock(&root->fs_info->balance_lock); |
fc67c450 | 3362 | return extended_to_chunk(target); |
e4d8ec0f ID |
3363 | } |
3364 | } | |
3365 | spin_unlock(&root->fs_info->balance_lock); | |
3366 | ||
53b381b3 | 3367 | /* First, mask out the RAID levels which aren't possible */ |
a061fc8d | 3368 | if (num_devices == 1) |
53b381b3 DW |
3369 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0 | |
3370 | BTRFS_BLOCK_GROUP_RAID5); | |
3371 | if (num_devices < 3) | |
3372 | flags &= ~BTRFS_BLOCK_GROUP_RAID6; | |
a061fc8d CM |
3373 | if (num_devices < 4) |
3374 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
3375 | ||
53b381b3 DW |
3376 | tmp = flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | |
3377 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID5 | | |
3378 | BTRFS_BLOCK_GROUP_RAID6 | BTRFS_BLOCK_GROUP_RAID10); | |
3379 | flags &= ~tmp; | |
ec44a35c | 3380 | |
53b381b3 DW |
3381 | if (tmp & BTRFS_BLOCK_GROUP_RAID6) |
3382 | tmp = BTRFS_BLOCK_GROUP_RAID6; | |
3383 | else if (tmp & BTRFS_BLOCK_GROUP_RAID5) | |
3384 | tmp = BTRFS_BLOCK_GROUP_RAID5; | |
3385 | else if (tmp & BTRFS_BLOCK_GROUP_RAID10) | |
3386 | tmp = BTRFS_BLOCK_GROUP_RAID10; | |
3387 | else if (tmp & BTRFS_BLOCK_GROUP_RAID1) | |
3388 | tmp = BTRFS_BLOCK_GROUP_RAID1; | |
3389 | else if (tmp & BTRFS_BLOCK_GROUP_RAID0) | |
3390 | tmp = BTRFS_BLOCK_GROUP_RAID0; | |
a46d11a8 | 3391 | |
53b381b3 | 3392 | return extended_to_chunk(flags | tmp); |
ec44a35c CM |
3393 | } |
3394 | ||
b742bb82 | 3395 | static u64 get_alloc_profile(struct btrfs_root *root, u64 flags) |
6a63209f | 3396 | { |
de98ced9 MX |
3397 | unsigned seq; |
3398 | ||
3399 | do { | |
3400 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
3401 | ||
3402 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
3403 | flags |= root->fs_info->avail_data_alloc_bits; | |
3404 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
3405 | flags |= root->fs_info->avail_system_alloc_bits; | |
3406 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
3407 | flags |= root->fs_info->avail_metadata_alloc_bits; | |
3408 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
6fef8df1 | 3409 | |
b742bb82 | 3410 | return btrfs_reduce_alloc_profile(root, flags); |
6a63209f JB |
3411 | } |
3412 | ||
6d07bcec | 3413 | u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data) |
9ed74f2d | 3414 | { |
b742bb82 | 3415 | u64 flags; |
53b381b3 | 3416 | u64 ret; |
9ed74f2d | 3417 | |
b742bb82 YZ |
3418 | if (data) |
3419 | flags = BTRFS_BLOCK_GROUP_DATA; | |
3420 | else if (root == root->fs_info->chunk_root) | |
3421 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
9ed74f2d | 3422 | else |
b742bb82 | 3423 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 3424 | |
53b381b3 DW |
3425 | ret = get_alloc_profile(root, flags); |
3426 | return ret; | |
6a63209f | 3427 | } |
9ed74f2d | 3428 | |
6a63209f | 3429 | /* |
6a63209f JB |
3430 | * This will check the space that the inode allocates from to make sure we have |
3431 | * enough space for bytes. | |
6a63209f | 3432 | */ |
0ca1f7ce | 3433 | int btrfs_check_data_free_space(struct inode *inode, u64 bytes) |
6a63209f | 3434 | { |
6a63209f | 3435 | struct btrfs_space_info *data_sinfo; |
0ca1f7ce | 3436 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b4d7c3c9 | 3437 | struct btrfs_fs_info *fs_info = root->fs_info; |
ab6e2410 | 3438 | u64 used; |
0af3d00b | 3439 | int ret = 0, committed = 0, alloc_chunk = 1; |
6a63209f | 3440 | |
6a63209f | 3441 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3442 | bytes = ALIGN(bytes, root->sectorsize); |
6a63209f | 3443 | |
82d5902d LZ |
3444 | if (root == root->fs_info->tree_root || |
3445 | BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { | |
0af3d00b JB |
3446 | alloc_chunk = 0; |
3447 | committed = 1; | |
3448 | } | |
3449 | ||
b4d7c3c9 | 3450 | data_sinfo = fs_info->data_sinfo; |
33b4d47f CM |
3451 | if (!data_sinfo) |
3452 | goto alloc; | |
9ed74f2d | 3453 | |
6a63209f JB |
3454 | again: |
3455 | /* make sure we have enough space to handle the data first */ | |
3456 | spin_lock(&data_sinfo->lock); | |
8929ecfa YZ |
3457 | used = data_sinfo->bytes_used + data_sinfo->bytes_reserved + |
3458 | data_sinfo->bytes_pinned + data_sinfo->bytes_readonly + | |
3459 | data_sinfo->bytes_may_use; | |
ab6e2410 JB |
3460 | |
3461 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 3462 | struct btrfs_trans_handle *trans; |
9ed74f2d | 3463 | |
6a63209f JB |
3464 | /* |
3465 | * if we don't have enough free bytes in this space then we need | |
3466 | * to alloc a new chunk. | |
3467 | */ | |
0af3d00b | 3468 | if (!data_sinfo->full && alloc_chunk) { |
6a63209f | 3469 | u64 alloc_target; |
9ed74f2d | 3470 | |
0e4f8f88 | 3471 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 3472 | spin_unlock(&data_sinfo->lock); |
33b4d47f | 3473 | alloc: |
6a63209f | 3474 | alloc_target = btrfs_get_alloc_profile(root, 1); |
7a7eaa40 | 3475 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3476 | if (IS_ERR(trans)) |
3477 | return PTR_ERR(trans); | |
9ed74f2d | 3478 | |
6a63209f | 3479 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0e4f8f88 CM |
3480 | alloc_target, |
3481 | CHUNK_ALLOC_NO_FORCE); | |
6a63209f | 3482 | btrfs_end_transaction(trans, root); |
d52a5b5f MX |
3483 | if (ret < 0) { |
3484 | if (ret != -ENOSPC) | |
3485 | return ret; | |
3486 | else | |
3487 | goto commit_trans; | |
3488 | } | |
9ed74f2d | 3489 | |
b4d7c3c9 LZ |
3490 | if (!data_sinfo) |
3491 | data_sinfo = fs_info->data_sinfo; | |
3492 | ||
6a63209f JB |
3493 | goto again; |
3494 | } | |
f2bb8f5c JB |
3495 | |
3496 | /* | |
3497 | * If we have less pinned bytes than we want to allocate then | |
3498 | * don't bother committing the transaction, it won't help us. | |
3499 | */ | |
3500 | if (data_sinfo->bytes_pinned < bytes) | |
3501 | committed = 1; | |
6a63209f | 3502 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3503 | |
4e06bdd6 | 3504 | /* commit the current transaction and try again */ |
d52a5b5f | 3505 | commit_trans: |
a4abeea4 JB |
3506 | if (!committed && |
3507 | !atomic_read(&root->fs_info->open_ioctl_trans)) { | |
4e06bdd6 | 3508 | committed = 1; |
7a7eaa40 | 3509 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
3510 | if (IS_ERR(trans)) |
3511 | return PTR_ERR(trans); | |
4e06bdd6 JB |
3512 | ret = btrfs_commit_transaction(trans, root); |
3513 | if (ret) | |
3514 | return ret; | |
3515 | goto again; | |
3516 | } | |
9ed74f2d | 3517 | |
6a63209f JB |
3518 | return -ENOSPC; |
3519 | } | |
3520 | data_sinfo->bytes_may_use += bytes; | |
8c2a3ca2 | 3521 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3522 | data_sinfo->flags, bytes, 1); |
6a63209f | 3523 | spin_unlock(&data_sinfo->lock); |
6a63209f | 3524 | |
9ed74f2d | 3525 | return 0; |
9ed74f2d | 3526 | } |
6a63209f | 3527 | |
6a63209f | 3528 | /* |
fb25e914 | 3529 | * Called if we need to clear a data reservation for this inode. |
6a63209f | 3530 | */ |
0ca1f7ce | 3531 | void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) |
e3ccfa98 | 3532 | { |
0ca1f7ce | 3533 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6a63209f | 3534 | struct btrfs_space_info *data_sinfo; |
e3ccfa98 | 3535 | |
6a63209f | 3536 | /* make sure bytes are sectorsize aligned */ |
fda2832f | 3537 | bytes = ALIGN(bytes, root->sectorsize); |
e3ccfa98 | 3538 | |
b4d7c3c9 | 3539 | data_sinfo = root->fs_info->data_sinfo; |
6a63209f JB |
3540 | spin_lock(&data_sinfo->lock); |
3541 | data_sinfo->bytes_may_use -= bytes; | |
8c2a3ca2 | 3542 | trace_btrfs_space_reservation(root->fs_info, "space_info", |
2bcc0328 | 3543 | data_sinfo->flags, bytes, 0); |
6a63209f | 3544 | spin_unlock(&data_sinfo->lock); |
e3ccfa98 JB |
3545 | } |
3546 | ||
97e728d4 | 3547 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 3548 | { |
97e728d4 JB |
3549 | struct list_head *head = &info->space_info; |
3550 | struct btrfs_space_info *found; | |
e3ccfa98 | 3551 | |
97e728d4 JB |
3552 | rcu_read_lock(); |
3553 | list_for_each_entry_rcu(found, head, list) { | |
3554 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 3555 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 3556 | } |
97e728d4 | 3557 | rcu_read_unlock(); |
e3ccfa98 JB |
3558 | } |
3559 | ||
e5bc2458 | 3560 | static int should_alloc_chunk(struct btrfs_root *root, |
698d0082 | 3561 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 3562 | { |
fb25e914 | 3563 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
424499db | 3564 | u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly; |
0e4f8f88 | 3565 | u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved; |
e5bc2458 | 3566 | u64 thresh; |
e3ccfa98 | 3567 | |
0e4f8f88 CM |
3568 | if (force == CHUNK_ALLOC_FORCE) |
3569 | return 1; | |
3570 | ||
fb25e914 JB |
3571 | /* |
3572 | * We need to take into account the global rsv because for all intents | |
3573 | * and purposes it's used space. Don't worry about locking the | |
3574 | * global_rsv, it doesn't change except when the transaction commits. | |
3575 | */ | |
54338b5c JB |
3576 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
3577 | num_allocated += global_rsv->size; | |
fb25e914 | 3578 | |
0e4f8f88 CM |
3579 | /* |
3580 | * in limited mode, we want to have some free space up to | |
3581 | * about 1% of the FS size. | |
3582 | */ | |
3583 | if (force == CHUNK_ALLOC_LIMITED) { | |
6c41761f | 3584 | thresh = btrfs_super_total_bytes(root->fs_info->super_copy); |
0e4f8f88 CM |
3585 | thresh = max_t(u64, 64 * 1024 * 1024, |
3586 | div_factor_fine(thresh, 1)); | |
3587 | ||
3588 | if (num_bytes - num_allocated < thresh) | |
3589 | return 1; | |
3590 | } | |
0e4f8f88 | 3591 | |
698d0082 | 3592 | if (num_allocated + 2 * 1024 * 1024 < div_factor(num_bytes, 8)) |
14ed0ca6 | 3593 | return 0; |
424499db | 3594 | return 1; |
32c00aff JB |
3595 | } |
3596 | ||
15d1ff81 LB |
3597 | static u64 get_system_chunk_thresh(struct btrfs_root *root, u64 type) |
3598 | { | |
3599 | u64 num_dev; | |
3600 | ||
53b381b3 DW |
3601 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
3602 | BTRFS_BLOCK_GROUP_RAID0 | | |
3603 | BTRFS_BLOCK_GROUP_RAID5 | | |
3604 | BTRFS_BLOCK_GROUP_RAID6)) | |
15d1ff81 LB |
3605 | num_dev = root->fs_info->fs_devices->rw_devices; |
3606 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
3607 | num_dev = 2; | |
3608 | else | |
3609 | num_dev = 1; /* DUP or single */ | |
3610 | ||
3611 | /* metadata for updaing devices and chunk tree */ | |
3612 | return btrfs_calc_trans_metadata_size(root, num_dev + 1); | |
3613 | } | |
3614 | ||
3615 | static void check_system_chunk(struct btrfs_trans_handle *trans, | |
3616 | struct btrfs_root *root, u64 type) | |
3617 | { | |
3618 | struct btrfs_space_info *info; | |
3619 | u64 left; | |
3620 | u64 thresh; | |
3621 | ||
3622 | info = __find_space_info(root->fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
3623 | spin_lock(&info->lock); | |
3624 | left = info->total_bytes - info->bytes_used - info->bytes_pinned - | |
3625 | info->bytes_reserved - info->bytes_readonly; | |
3626 | spin_unlock(&info->lock); | |
3627 | ||
3628 | thresh = get_system_chunk_thresh(root, type); | |
3629 | if (left < thresh && btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
3630 | printk(KERN_INFO "left=%llu, need=%llu, flags=%llu\n", | |
3631 | left, thresh, type); | |
3632 | dump_space_info(info, 0, 0); | |
3633 | } | |
3634 | ||
3635 | if (left < thresh) { | |
3636 | u64 flags; | |
3637 | ||
3638 | flags = btrfs_get_alloc_profile(root->fs_info->chunk_root, 0); | |
3639 | btrfs_alloc_chunk(trans, root, flags); | |
3640 | } | |
3641 | } | |
3642 | ||
6324fbf3 | 3643 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
698d0082 | 3644 | struct btrfs_root *extent_root, u64 flags, int force) |
9ed74f2d | 3645 | { |
6324fbf3 | 3646 | struct btrfs_space_info *space_info; |
97e728d4 | 3647 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
6d74119f | 3648 | int wait_for_alloc = 0; |
9ed74f2d | 3649 | int ret = 0; |
9ed74f2d | 3650 | |
c6b305a8 JB |
3651 | /* Don't re-enter if we're already allocating a chunk */ |
3652 | if (trans->allocating_chunk) | |
3653 | return -ENOSPC; | |
3654 | ||
6324fbf3 | 3655 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
3656 | if (!space_info) { |
3657 | ret = update_space_info(extent_root->fs_info, flags, | |
3658 | 0, 0, &space_info); | |
79787eaa | 3659 | BUG_ON(ret); /* -ENOMEM */ |
9ed74f2d | 3660 | } |
79787eaa | 3661 | BUG_ON(!space_info); /* Logic error */ |
9ed74f2d | 3662 | |
6d74119f | 3663 | again: |
25179201 | 3664 | spin_lock(&space_info->lock); |
9e622d6b | 3665 | if (force < space_info->force_alloc) |
0e4f8f88 | 3666 | force = space_info->force_alloc; |
25179201 JB |
3667 | if (space_info->full) { |
3668 | spin_unlock(&space_info->lock); | |
6d74119f | 3669 | return 0; |
9ed74f2d JB |
3670 | } |
3671 | ||
698d0082 | 3672 | if (!should_alloc_chunk(extent_root, space_info, force)) { |
25179201 | 3673 | spin_unlock(&space_info->lock); |
6d74119f JB |
3674 | return 0; |
3675 | } else if (space_info->chunk_alloc) { | |
3676 | wait_for_alloc = 1; | |
3677 | } else { | |
3678 | space_info->chunk_alloc = 1; | |
9ed74f2d | 3679 | } |
0e4f8f88 | 3680 | |
25179201 | 3681 | spin_unlock(&space_info->lock); |
9ed74f2d | 3682 | |
6d74119f JB |
3683 | mutex_lock(&fs_info->chunk_mutex); |
3684 | ||
3685 | /* | |
3686 | * The chunk_mutex is held throughout the entirety of a chunk | |
3687 | * allocation, so once we've acquired the chunk_mutex we know that the | |
3688 | * other guy is done and we need to recheck and see if we should | |
3689 | * allocate. | |
3690 | */ | |
3691 | if (wait_for_alloc) { | |
3692 | mutex_unlock(&fs_info->chunk_mutex); | |
3693 | wait_for_alloc = 0; | |
3694 | goto again; | |
3695 | } | |
3696 | ||
c6b305a8 JB |
3697 | trans->allocating_chunk = true; |
3698 | ||
67377734 JB |
3699 | /* |
3700 | * If we have mixed data/metadata chunks we want to make sure we keep | |
3701 | * allocating mixed chunks instead of individual chunks. | |
3702 | */ | |
3703 | if (btrfs_mixed_space_info(space_info)) | |
3704 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
3705 | ||
97e728d4 JB |
3706 | /* |
3707 | * if we're doing a data chunk, go ahead and make sure that | |
3708 | * we keep a reasonable number of metadata chunks allocated in the | |
3709 | * FS as well. | |
3710 | */ | |
9ed74f2d | 3711 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
3712 | fs_info->data_chunk_allocations++; |
3713 | if (!(fs_info->data_chunk_allocations % | |
3714 | fs_info->metadata_ratio)) | |
3715 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
3716 | } |
3717 | ||
15d1ff81 LB |
3718 | /* |
3719 | * Check if we have enough space in SYSTEM chunk because we may need | |
3720 | * to update devices. | |
3721 | */ | |
3722 | check_system_chunk(trans, extent_root, flags); | |
3723 | ||
2b82032c | 3724 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
c6b305a8 | 3725 | trans->allocating_chunk = false; |
92b8e897 | 3726 | |
9ed74f2d | 3727 | spin_lock(&space_info->lock); |
a81cb9a2 AO |
3728 | if (ret < 0 && ret != -ENOSPC) |
3729 | goto out; | |
9ed74f2d | 3730 | if (ret) |
6324fbf3 | 3731 | space_info->full = 1; |
424499db YZ |
3732 | else |
3733 | ret = 1; | |
6d74119f | 3734 | |
0e4f8f88 | 3735 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 3736 | out: |
6d74119f | 3737 | space_info->chunk_alloc = 0; |
9ed74f2d | 3738 | spin_unlock(&space_info->lock); |
a25c75d5 | 3739 | mutex_unlock(&fs_info->chunk_mutex); |
0f9dd46c | 3740 | return ret; |
6324fbf3 | 3741 | } |
9ed74f2d | 3742 | |
a80c8dcf JB |
3743 | static int can_overcommit(struct btrfs_root *root, |
3744 | struct btrfs_space_info *space_info, u64 bytes, | |
08e007d2 | 3745 | enum btrfs_reserve_flush_enum flush) |
a80c8dcf | 3746 | { |
96f1bb57 | 3747 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
a80c8dcf | 3748 | u64 profile = btrfs_get_alloc_profile(root, 0); |
96f1bb57 | 3749 | u64 rsv_size = 0; |
a80c8dcf JB |
3750 | u64 avail; |
3751 | u64 used; | |
70afa399 | 3752 | u64 to_add; |
a80c8dcf JB |
3753 | |
3754 | used = space_info->bytes_used + space_info->bytes_reserved + | |
96f1bb57 JB |
3755 | space_info->bytes_pinned + space_info->bytes_readonly; |
3756 | ||
3757 | spin_lock(&global_rsv->lock); | |
3758 | rsv_size = global_rsv->size; | |
3759 | spin_unlock(&global_rsv->lock); | |
3760 | ||
3761 | /* | |
3762 | * We only want to allow over committing if we have lots of actual space | |
3763 | * free, but if we don't have enough space to handle the global reserve | |
3764 | * space then we could end up having a real enospc problem when trying | |
3765 | * to allocate a chunk or some other such important allocation. | |
3766 | */ | |
3767 | rsv_size <<= 1; | |
3768 | if (used + rsv_size >= space_info->total_bytes) | |
3769 | return 0; | |
3770 | ||
3771 | used += space_info->bytes_may_use; | |
a80c8dcf JB |
3772 | |
3773 | spin_lock(&root->fs_info->free_chunk_lock); | |
3774 | avail = root->fs_info->free_chunk_space; | |
3775 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3776 | ||
3777 | /* | |
3778 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
3779 | * space is actually useable. For raid56, the space info used |
3780 | * doesn't include the parity drive, so we don't have to | |
3781 | * change the math | |
a80c8dcf JB |
3782 | */ |
3783 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
3784 | BTRFS_BLOCK_GROUP_RAID1 | | |
3785 | BTRFS_BLOCK_GROUP_RAID10)) | |
3786 | avail >>= 1; | |
3787 | ||
70afa399 JB |
3788 | to_add = space_info->total_bytes; |
3789 | ||
a80c8dcf | 3790 | /* |
561c294d MX |
3791 | * If we aren't flushing all things, let us overcommit up to |
3792 | * 1/2th of the space. If we can flush, don't let us overcommit | |
3793 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 3794 | */ |
08e007d2 | 3795 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
70afa399 | 3796 | to_add >>= 3; |
a80c8dcf | 3797 | else |
70afa399 | 3798 | to_add >>= 1; |
a80c8dcf | 3799 | |
70afa399 JB |
3800 | /* |
3801 | * Limit the overcommit to the amount of free space we could possibly | |
3802 | * allocate for chunks. | |
3803 | */ | |
3804 | to_add = min(avail, to_add); | |
a80c8dcf | 3805 | |
70afa399 | 3806 | if (used + bytes < space_info->total_bytes + to_add) |
a80c8dcf JB |
3807 | return 1; |
3808 | return 0; | |
3809 | } | |
3810 | ||
da633a42 MX |
3811 | void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, |
3812 | unsigned long nr_pages) | |
3813 | { | |
3814 | struct super_block *sb = root->fs_info->sb; | |
3815 | int started; | |
3816 | ||
3817 | /* If we can not start writeback, just sync all the delalloc file. */ | |
b695188d | 3818 | started = try_to_writeback_inodes_sb_nr(sb, nr_pages, |
da633a42 MX |
3819 | WB_REASON_FS_FREE_SPACE); |
3820 | if (!started) { | |
3821 | /* | |
3822 | * We needn't worry the filesystem going from r/w to r/o though | |
3823 | * we don't acquire ->s_umount mutex, because the filesystem | |
3824 | * should guarantee the delalloc inodes list be empty after | |
3825 | * the filesystem is readonly(all dirty pages are written to | |
3826 | * the disk). | |
3827 | */ | |
3828 | btrfs_start_delalloc_inodes(root, 0); | |
3829 | btrfs_wait_ordered_extents(root, 0); | |
3830 | } | |
3831 | } | |
3832 | ||
9ed74f2d | 3833 | /* |
5da9d01b | 3834 | * shrink metadata reservation for delalloc |
9ed74f2d | 3835 | */ |
f4c738c2 JB |
3836 | static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, |
3837 | bool wait_ordered) | |
5da9d01b | 3838 | { |
0ca1f7ce | 3839 | struct btrfs_block_rsv *block_rsv; |
0019f10d | 3840 | struct btrfs_space_info *space_info; |
663350ac | 3841 | struct btrfs_trans_handle *trans; |
f4c738c2 | 3842 | u64 delalloc_bytes; |
5da9d01b | 3843 | u64 max_reclaim; |
b1953bce | 3844 | long time_left; |
877da174 | 3845 | unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; |
b1953bce | 3846 | int loops = 0; |
08e007d2 | 3847 | enum btrfs_reserve_flush_enum flush; |
5da9d01b | 3848 | |
663350ac | 3849 | trans = (struct btrfs_trans_handle *)current->journal_info; |
0ca1f7ce | 3850 | block_rsv = &root->fs_info->delalloc_block_rsv; |
0019f10d | 3851 | space_info = block_rsv->space_info; |
bf9022e0 CM |
3852 | |
3853 | smp_mb(); | |
963d678b MX |
3854 | delalloc_bytes = percpu_counter_sum_positive( |
3855 | &root->fs_info->delalloc_bytes); | |
f4c738c2 | 3856 | if (delalloc_bytes == 0) { |
fdb5effd | 3857 | if (trans) |
f4c738c2 | 3858 | return; |
6bbe3a9c | 3859 | btrfs_wait_ordered_extents(root, 0); |
f4c738c2 | 3860 | return; |
fdb5effd JB |
3861 | } |
3862 | ||
f4c738c2 JB |
3863 | while (delalloc_bytes && loops < 3) { |
3864 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
3865 | nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; | |
da633a42 | 3866 | btrfs_writeback_inodes_sb_nr(root, nr_pages); |
dea31f52 JB |
3867 | /* |
3868 | * We need to wait for the async pages to actually start before | |
3869 | * we do anything. | |
3870 | */ | |
3871 | wait_event(root->fs_info->async_submit_wait, | |
3872 | !atomic_read(&root->fs_info->async_delalloc_pages)); | |
3873 | ||
08e007d2 MX |
3874 | if (!trans) |
3875 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
3876 | else | |
3877 | flush = BTRFS_RESERVE_NO_FLUSH; | |
0019f10d | 3878 | spin_lock(&space_info->lock); |
08e007d2 | 3879 | if (can_overcommit(root, space_info, orig, flush)) { |
f4c738c2 JB |
3880 | spin_unlock(&space_info->lock); |
3881 | break; | |
3882 | } | |
0019f10d | 3883 | spin_unlock(&space_info->lock); |
5da9d01b | 3884 | |
36e39c40 | 3885 | loops++; |
f104d044 | 3886 | if (wait_ordered && !trans) { |
6bbe3a9c | 3887 | btrfs_wait_ordered_extents(root, 0); |
f104d044 | 3888 | } else { |
f4c738c2 | 3889 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
3890 | if (time_left) |
3891 | break; | |
3892 | } | |
f4c738c2 | 3893 | smp_mb(); |
963d678b MX |
3894 | delalloc_bytes = percpu_counter_sum_positive( |
3895 | &root->fs_info->delalloc_bytes); | |
5da9d01b | 3896 | } |
5da9d01b YZ |
3897 | } |
3898 | ||
663350ac JB |
3899 | /** |
3900 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
3901 | * @root - the root we're allocating for | |
3902 | * @bytes - the number of bytes we want to reserve | |
3903 | * @force - force the commit | |
8bb8ab2e | 3904 | * |
663350ac JB |
3905 | * This will check to make sure that committing the transaction will actually |
3906 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
3907 | * will return -ENOSPC. | |
8bb8ab2e | 3908 | */ |
663350ac JB |
3909 | static int may_commit_transaction(struct btrfs_root *root, |
3910 | struct btrfs_space_info *space_info, | |
3911 | u64 bytes, int force) | |
3912 | { | |
3913 | struct btrfs_block_rsv *delayed_rsv = &root->fs_info->delayed_block_rsv; | |
3914 | struct btrfs_trans_handle *trans; | |
3915 | ||
3916 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
3917 | if (trans) | |
3918 | return -EAGAIN; | |
3919 | ||
3920 | if (force) | |
3921 | goto commit; | |
3922 | ||
3923 | /* See if there is enough pinned space to make this reservation */ | |
3924 | spin_lock(&space_info->lock); | |
3925 | if (space_info->bytes_pinned >= bytes) { | |
3926 | spin_unlock(&space_info->lock); | |
3927 | goto commit; | |
3928 | } | |
3929 | spin_unlock(&space_info->lock); | |
3930 | ||
3931 | /* | |
3932 | * See if there is some space in the delayed insertion reservation for | |
3933 | * this reservation. | |
3934 | */ | |
3935 | if (space_info != delayed_rsv->space_info) | |
3936 | return -ENOSPC; | |
3937 | ||
d9b0218f | 3938 | spin_lock(&space_info->lock); |
663350ac | 3939 | spin_lock(&delayed_rsv->lock); |
d9b0218f | 3940 | if (space_info->bytes_pinned + delayed_rsv->size < bytes) { |
663350ac | 3941 | spin_unlock(&delayed_rsv->lock); |
d9b0218f | 3942 | spin_unlock(&space_info->lock); |
663350ac JB |
3943 | return -ENOSPC; |
3944 | } | |
3945 | spin_unlock(&delayed_rsv->lock); | |
d9b0218f | 3946 | spin_unlock(&space_info->lock); |
663350ac JB |
3947 | |
3948 | commit: | |
3949 | trans = btrfs_join_transaction(root); | |
3950 | if (IS_ERR(trans)) | |
3951 | return -ENOSPC; | |
3952 | ||
3953 | return btrfs_commit_transaction(trans, root); | |
3954 | } | |
3955 | ||
96c3f433 | 3956 | enum flush_state { |
67b0fd63 JB |
3957 | FLUSH_DELAYED_ITEMS_NR = 1, |
3958 | FLUSH_DELAYED_ITEMS = 2, | |
3959 | FLUSH_DELALLOC = 3, | |
3960 | FLUSH_DELALLOC_WAIT = 4, | |
ea658bad JB |
3961 | ALLOC_CHUNK = 5, |
3962 | COMMIT_TRANS = 6, | |
96c3f433 JB |
3963 | }; |
3964 | ||
3965 | static int flush_space(struct btrfs_root *root, | |
3966 | struct btrfs_space_info *space_info, u64 num_bytes, | |
3967 | u64 orig_bytes, int state) | |
3968 | { | |
3969 | struct btrfs_trans_handle *trans; | |
3970 | int nr; | |
f4c738c2 | 3971 | int ret = 0; |
96c3f433 JB |
3972 | |
3973 | switch (state) { | |
96c3f433 JB |
3974 | case FLUSH_DELAYED_ITEMS_NR: |
3975 | case FLUSH_DELAYED_ITEMS: | |
3976 | if (state == FLUSH_DELAYED_ITEMS_NR) { | |
3977 | u64 bytes = btrfs_calc_trans_metadata_size(root, 1); | |
3978 | ||
3979 | nr = (int)div64_u64(num_bytes, bytes); | |
3980 | if (!nr) | |
3981 | nr = 1; | |
3982 | nr *= 2; | |
3983 | } else { | |
3984 | nr = -1; | |
3985 | } | |
3986 | trans = btrfs_join_transaction(root); | |
3987 | if (IS_ERR(trans)) { | |
3988 | ret = PTR_ERR(trans); | |
3989 | break; | |
3990 | } | |
3991 | ret = btrfs_run_delayed_items_nr(trans, root, nr); | |
3992 | btrfs_end_transaction(trans, root); | |
3993 | break; | |
67b0fd63 JB |
3994 | case FLUSH_DELALLOC: |
3995 | case FLUSH_DELALLOC_WAIT: | |
3996 | shrink_delalloc(root, num_bytes, orig_bytes, | |
3997 | state == FLUSH_DELALLOC_WAIT); | |
3998 | break; | |
ea658bad JB |
3999 | case ALLOC_CHUNK: |
4000 | trans = btrfs_join_transaction(root); | |
4001 | if (IS_ERR(trans)) { | |
4002 | ret = PTR_ERR(trans); | |
4003 | break; | |
4004 | } | |
4005 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
ea658bad JB |
4006 | btrfs_get_alloc_profile(root, 0), |
4007 | CHUNK_ALLOC_NO_FORCE); | |
4008 | btrfs_end_transaction(trans, root); | |
4009 | if (ret == -ENOSPC) | |
4010 | ret = 0; | |
4011 | break; | |
96c3f433 JB |
4012 | case COMMIT_TRANS: |
4013 | ret = may_commit_transaction(root, space_info, orig_bytes, 0); | |
4014 | break; | |
4015 | default: | |
4016 | ret = -ENOSPC; | |
4017 | break; | |
4018 | } | |
4019 | ||
4020 | return ret; | |
4021 | } | |
4a92b1b8 JB |
4022 | /** |
4023 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
4024 | * @root - the root we're allocating for | |
4025 | * @block_rsv - the block_rsv we're allocating for | |
4026 | * @orig_bytes - the number of bytes we want | |
48fc7f7e | 4027 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 4028 | * |
4a92b1b8 JB |
4029 | * This will reserve orgi_bytes number of bytes from the space info associated |
4030 | * with the block_rsv. If there is not enough space it will make an attempt to | |
4031 | * flush out space to make room. It will do this by flushing delalloc if | |
4032 | * possible or committing the transaction. If flush is 0 then no attempts to | |
4033 | * regain reservations will be made and this will fail if there is not enough | |
4034 | * space already. | |
8bb8ab2e | 4035 | */ |
4a92b1b8 | 4036 | static int reserve_metadata_bytes(struct btrfs_root *root, |
8bb8ab2e | 4037 | struct btrfs_block_rsv *block_rsv, |
08e007d2 MX |
4038 | u64 orig_bytes, |
4039 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4040 | { |
f0486c68 | 4041 | struct btrfs_space_info *space_info = block_rsv->space_info; |
2bf64758 | 4042 | u64 used; |
8bb8ab2e | 4043 | u64 num_bytes = orig_bytes; |
67b0fd63 | 4044 | int flush_state = FLUSH_DELAYED_ITEMS_NR; |
8bb8ab2e | 4045 | int ret = 0; |
fdb5effd | 4046 | bool flushing = false; |
9ed74f2d | 4047 | |
8bb8ab2e | 4048 | again: |
fdb5effd | 4049 | ret = 0; |
8bb8ab2e | 4050 | spin_lock(&space_info->lock); |
fdb5effd | 4051 | /* |
08e007d2 MX |
4052 | * We only want to wait if somebody other than us is flushing and we |
4053 | * are actually allowed to flush all things. | |
fdb5effd | 4054 | */ |
08e007d2 MX |
4055 | while (flush == BTRFS_RESERVE_FLUSH_ALL && !flushing && |
4056 | space_info->flush) { | |
fdb5effd JB |
4057 | spin_unlock(&space_info->lock); |
4058 | /* | |
4059 | * If we have a trans handle we can't wait because the flusher | |
4060 | * may have to commit the transaction, which would mean we would | |
4061 | * deadlock since we are waiting for the flusher to finish, but | |
4062 | * hold the current transaction open. | |
4063 | */ | |
663350ac | 4064 | if (current->journal_info) |
fdb5effd | 4065 | return -EAGAIN; |
b9688bb8 AJ |
4066 | ret = wait_event_killable(space_info->wait, !space_info->flush); |
4067 | /* Must have been killed, return */ | |
4068 | if (ret) | |
fdb5effd JB |
4069 | return -EINTR; |
4070 | ||
4071 | spin_lock(&space_info->lock); | |
4072 | } | |
4073 | ||
4074 | ret = -ENOSPC; | |
2bf64758 JB |
4075 | used = space_info->bytes_used + space_info->bytes_reserved + |
4076 | space_info->bytes_pinned + space_info->bytes_readonly + | |
4077 | space_info->bytes_may_use; | |
9ed74f2d | 4078 | |
8bb8ab2e JB |
4079 | /* |
4080 | * The idea here is that we've not already over-reserved the block group | |
4081 | * then we can go ahead and save our reservation first and then start | |
4082 | * flushing if we need to. Otherwise if we've already overcommitted | |
4083 | * lets start flushing stuff first and then come back and try to make | |
4084 | * our reservation. | |
4085 | */ | |
2bf64758 JB |
4086 | if (used <= space_info->total_bytes) { |
4087 | if (used + orig_bytes <= space_info->total_bytes) { | |
fb25e914 | 4088 | space_info->bytes_may_use += orig_bytes; |
8c2a3ca2 | 4089 | trace_btrfs_space_reservation(root->fs_info, |
2bcc0328 | 4090 | "space_info", space_info->flags, orig_bytes, 1); |
8bb8ab2e JB |
4091 | ret = 0; |
4092 | } else { | |
4093 | /* | |
4094 | * Ok set num_bytes to orig_bytes since we aren't | |
4095 | * overocmmitted, this way we only try and reclaim what | |
4096 | * we need. | |
4097 | */ | |
4098 | num_bytes = orig_bytes; | |
4099 | } | |
4100 | } else { | |
4101 | /* | |
4102 | * Ok we're over committed, set num_bytes to the overcommitted | |
4103 | * amount plus the amount of bytes that we need for this | |
4104 | * reservation. | |
4105 | */ | |
2bf64758 | 4106 | num_bytes = used - space_info->total_bytes + |
96c3f433 | 4107 | (orig_bytes * 2); |
8bb8ab2e | 4108 | } |
9ed74f2d | 4109 | |
44734ed1 JB |
4110 | if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { |
4111 | space_info->bytes_may_use += orig_bytes; | |
4112 | trace_btrfs_space_reservation(root->fs_info, "space_info", | |
4113 | space_info->flags, orig_bytes, | |
4114 | 1); | |
4115 | ret = 0; | |
2bf64758 JB |
4116 | } |
4117 | ||
8bb8ab2e JB |
4118 | /* |
4119 | * Couldn't make our reservation, save our place so while we're trying | |
4120 | * to reclaim space we can actually use it instead of somebody else | |
4121 | * stealing it from us. | |
08e007d2 MX |
4122 | * |
4123 | * We make the other tasks wait for the flush only when we can flush | |
4124 | * all things. | |
8bb8ab2e | 4125 | */ |
72bcd99d | 4126 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
fdb5effd JB |
4127 | flushing = true; |
4128 | space_info->flush = 1; | |
8bb8ab2e | 4129 | } |
9ed74f2d | 4130 | |
f0486c68 | 4131 | spin_unlock(&space_info->lock); |
9ed74f2d | 4132 | |
08e007d2 | 4133 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
8bb8ab2e | 4134 | goto out; |
f0486c68 | 4135 | |
96c3f433 JB |
4136 | ret = flush_space(root, space_info, num_bytes, orig_bytes, |
4137 | flush_state); | |
4138 | flush_state++; | |
08e007d2 MX |
4139 | |
4140 | /* | |
4141 | * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock | |
4142 | * would happen. So skip delalloc flush. | |
4143 | */ | |
4144 | if (flush == BTRFS_RESERVE_FLUSH_LIMIT && | |
4145 | (flush_state == FLUSH_DELALLOC || | |
4146 | flush_state == FLUSH_DELALLOC_WAIT)) | |
4147 | flush_state = ALLOC_CHUNK; | |
4148 | ||
96c3f433 | 4149 | if (!ret) |
8bb8ab2e | 4150 | goto again; |
08e007d2 MX |
4151 | else if (flush == BTRFS_RESERVE_FLUSH_LIMIT && |
4152 | flush_state < COMMIT_TRANS) | |
4153 | goto again; | |
4154 | else if (flush == BTRFS_RESERVE_FLUSH_ALL && | |
4155 | flush_state <= COMMIT_TRANS) | |
8bb8ab2e JB |
4156 | goto again; |
4157 | ||
4158 | out: | |
5d80366e JB |
4159 | if (ret == -ENOSPC && |
4160 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
4161 | struct btrfs_block_rsv *global_rsv = | |
4162 | &root->fs_info->global_block_rsv; | |
4163 | ||
4164 | if (block_rsv != global_rsv && | |
4165 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
4166 | ret = 0; | |
4167 | } | |
fdb5effd | 4168 | if (flushing) { |
8bb8ab2e | 4169 | spin_lock(&space_info->lock); |
fdb5effd JB |
4170 | space_info->flush = 0; |
4171 | wake_up_all(&space_info->wait); | |
8bb8ab2e | 4172 | spin_unlock(&space_info->lock); |
f0486c68 | 4173 | } |
f0486c68 YZ |
4174 | return ret; |
4175 | } | |
4176 | ||
79787eaa JM |
4177 | static struct btrfs_block_rsv *get_block_rsv( |
4178 | const struct btrfs_trans_handle *trans, | |
4179 | const struct btrfs_root *root) | |
f0486c68 | 4180 | { |
4c13d758 JB |
4181 | struct btrfs_block_rsv *block_rsv = NULL; |
4182 | ||
0e721106 JB |
4183 | if (root->ref_cows) |
4184 | block_rsv = trans->block_rsv; | |
4185 | ||
4186 | if (root == root->fs_info->csum_root && trans->adding_csums) | |
f0486c68 | 4187 | block_rsv = trans->block_rsv; |
4c13d758 JB |
4188 | |
4189 | if (!block_rsv) | |
f0486c68 YZ |
4190 | block_rsv = root->block_rsv; |
4191 | ||
4192 | if (!block_rsv) | |
4193 | block_rsv = &root->fs_info->empty_block_rsv; | |
4194 | ||
4195 | return block_rsv; | |
4196 | } | |
4197 | ||
4198 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
4199 | u64 num_bytes) | |
4200 | { | |
4201 | int ret = -ENOSPC; | |
4202 | spin_lock(&block_rsv->lock); | |
4203 | if (block_rsv->reserved >= num_bytes) { | |
4204 | block_rsv->reserved -= num_bytes; | |
4205 | if (block_rsv->reserved < block_rsv->size) | |
4206 | block_rsv->full = 0; | |
4207 | ret = 0; | |
4208 | } | |
4209 | spin_unlock(&block_rsv->lock); | |
4210 | return ret; | |
4211 | } | |
4212 | ||
4213 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
4214 | u64 num_bytes, int update_size) | |
4215 | { | |
4216 | spin_lock(&block_rsv->lock); | |
4217 | block_rsv->reserved += num_bytes; | |
4218 | if (update_size) | |
4219 | block_rsv->size += num_bytes; | |
4220 | else if (block_rsv->reserved >= block_rsv->size) | |
4221 | block_rsv->full = 1; | |
4222 | spin_unlock(&block_rsv->lock); | |
4223 | } | |
4224 | ||
8c2a3ca2 JB |
4225 | static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
4226 | struct btrfs_block_rsv *block_rsv, | |
62a45b60 | 4227 | struct btrfs_block_rsv *dest, u64 num_bytes) |
f0486c68 YZ |
4228 | { |
4229 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
4230 | ||
4231 | spin_lock(&block_rsv->lock); | |
4232 | if (num_bytes == (u64)-1) | |
4233 | num_bytes = block_rsv->size; | |
4234 | block_rsv->size -= num_bytes; | |
4235 | if (block_rsv->reserved >= block_rsv->size) { | |
4236 | num_bytes = block_rsv->reserved - block_rsv->size; | |
4237 | block_rsv->reserved = block_rsv->size; | |
4238 | block_rsv->full = 1; | |
4239 | } else { | |
4240 | num_bytes = 0; | |
4241 | } | |
4242 | spin_unlock(&block_rsv->lock); | |
4243 | ||
4244 | if (num_bytes > 0) { | |
4245 | if (dest) { | |
e9e22899 JB |
4246 | spin_lock(&dest->lock); |
4247 | if (!dest->full) { | |
4248 | u64 bytes_to_add; | |
4249 | ||
4250 | bytes_to_add = dest->size - dest->reserved; | |
4251 | bytes_to_add = min(num_bytes, bytes_to_add); | |
4252 | dest->reserved += bytes_to_add; | |
4253 | if (dest->reserved >= dest->size) | |
4254 | dest->full = 1; | |
4255 | num_bytes -= bytes_to_add; | |
4256 | } | |
4257 | spin_unlock(&dest->lock); | |
4258 | } | |
4259 | if (num_bytes) { | |
f0486c68 | 4260 | spin_lock(&space_info->lock); |
fb25e914 | 4261 | space_info->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4262 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4263 | space_info->flags, num_bytes, 0); |
36e39c40 | 4264 | space_info->reservation_progress++; |
f0486c68 | 4265 | spin_unlock(&space_info->lock); |
4e06bdd6 | 4266 | } |
9ed74f2d | 4267 | } |
f0486c68 | 4268 | } |
4e06bdd6 | 4269 | |
f0486c68 YZ |
4270 | static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, |
4271 | struct btrfs_block_rsv *dst, u64 num_bytes) | |
4272 | { | |
4273 | int ret; | |
9ed74f2d | 4274 | |
f0486c68 YZ |
4275 | ret = block_rsv_use_bytes(src, num_bytes); |
4276 | if (ret) | |
4277 | return ret; | |
9ed74f2d | 4278 | |
f0486c68 | 4279 | block_rsv_add_bytes(dst, num_bytes, 1); |
9ed74f2d JB |
4280 | return 0; |
4281 | } | |
4282 | ||
66d8f3dd | 4283 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 4284 | { |
f0486c68 YZ |
4285 | memset(rsv, 0, sizeof(*rsv)); |
4286 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 4287 | rsv->type = type; |
f0486c68 YZ |
4288 | } |
4289 | ||
66d8f3dd MX |
4290 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, |
4291 | unsigned short type) | |
f0486c68 YZ |
4292 | { |
4293 | struct btrfs_block_rsv *block_rsv; | |
4294 | struct btrfs_fs_info *fs_info = root->fs_info; | |
9ed74f2d | 4295 | |
f0486c68 YZ |
4296 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
4297 | if (!block_rsv) | |
4298 | return NULL; | |
9ed74f2d | 4299 | |
66d8f3dd | 4300 | btrfs_init_block_rsv(block_rsv, type); |
f0486c68 YZ |
4301 | block_rsv->space_info = __find_space_info(fs_info, |
4302 | BTRFS_BLOCK_GROUP_METADATA); | |
f0486c68 YZ |
4303 | return block_rsv; |
4304 | } | |
9ed74f2d | 4305 | |
f0486c68 YZ |
4306 | void btrfs_free_block_rsv(struct btrfs_root *root, |
4307 | struct btrfs_block_rsv *rsv) | |
4308 | { | |
2aaa6655 JB |
4309 | if (!rsv) |
4310 | return; | |
dabdb640 JB |
4311 | btrfs_block_rsv_release(root, rsv, (u64)-1); |
4312 | kfree(rsv); | |
9ed74f2d JB |
4313 | } |
4314 | ||
08e007d2 MX |
4315 | int btrfs_block_rsv_add(struct btrfs_root *root, |
4316 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
4317 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 4318 | { |
f0486c68 | 4319 | int ret; |
9ed74f2d | 4320 | |
f0486c68 YZ |
4321 | if (num_bytes == 0) |
4322 | return 0; | |
8bb8ab2e | 4323 | |
61b520a9 | 4324 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
4325 | if (!ret) { |
4326 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
4327 | return 0; | |
4328 | } | |
9ed74f2d | 4329 | |
f0486c68 | 4330 | return ret; |
f0486c68 | 4331 | } |
9ed74f2d | 4332 | |
4a92b1b8 | 4333 | int btrfs_block_rsv_check(struct btrfs_root *root, |
36ba022a | 4334 | struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
4335 | { |
4336 | u64 num_bytes = 0; | |
f0486c68 | 4337 | int ret = -ENOSPC; |
9ed74f2d | 4338 | |
f0486c68 YZ |
4339 | if (!block_rsv) |
4340 | return 0; | |
9ed74f2d | 4341 | |
f0486c68 | 4342 | spin_lock(&block_rsv->lock); |
36ba022a JB |
4343 | num_bytes = div_factor(block_rsv->size, min_factor); |
4344 | if (block_rsv->reserved >= num_bytes) | |
4345 | ret = 0; | |
4346 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 4347 | |
36ba022a JB |
4348 | return ret; |
4349 | } | |
4350 | ||
08e007d2 MX |
4351 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
4352 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
4353 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
4354 | { |
4355 | u64 num_bytes = 0; | |
4356 | int ret = -ENOSPC; | |
4357 | ||
4358 | if (!block_rsv) | |
4359 | return 0; | |
4360 | ||
4361 | spin_lock(&block_rsv->lock); | |
4362 | num_bytes = min_reserved; | |
13553e52 | 4363 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 4364 | ret = 0; |
13553e52 | 4365 | else |
f0486c68 | 4366 | num_bytes -= block_rsv->reserved; |
f0486c68 | 4367 | spin_unlock(&block_rsv->lock); |
13553e52 | 4368 | |
f0486c68 YZ |
4369 | if (!ret) |
4370 | return 0; | |
4371 | ||
aa38a711 | 4372 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
4373 | if (!ret) { |
4374 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 4375 | return 0; |
6a63209f | 4376 | } |
9ed74f2d | 4377 | |
13553e52 | 4378 | return ret; |
f0486c68 YZ |
4379 | } |
4380 | ||
4381 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, | |
4382 | struct btrfs_block_rsv *dst_rsv, | |
4383 | u64 num_bytes) | |
4384 | { | |
4385 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); | |
4386 | } | |
4387 | ||
4388 | void btrfs_block_rsv_release(struct btrfs_root *root, | |
4389 | struct btrfs_block_rsv *block_rsv, | |
4390 | u64 num_bytes) | |
4391 | { | |
4392 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; | |
4393 | if (global_rsv->full || global_rsv == block_rsv || | |
4394 | block_rsv->space_info != global_rsv->space_info) | |
4395 | global_rsv = NULL; | |
8c2a3ca2 JB |
4396 | block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv, |
4397 | num_bytes); | |
6a63209f JB |
4398 | } |
4399 | ||
4400 | /* | |
8929ecfa YZ |
4401 | * helper to calculate size of global block reservation. |
4402 | * the desired value is sum of space used by extent tree, | |
4403 | * checksum tree and root tree | |
6a63209f | 4404 | */ |
8929ecfa | 4405 | static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) |
6a63209f | 4406 | { |
8929ecfa YZ |
4407 | struct btrfs_space_info *sinfo; |
4408 | u64 num_bytes; | |
4409 | u64 meta_used; | |
4410 | u64 data_used; | |
6c41761f | 4411 | int csum_size = btrfs_super_csum_size(fs_info->super_copy); |
6a63209f | 4412 | |
8929ecfa YZ |
4413 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA); |
4414 | spin_lock(&sinfo->lock); | |
4415 | data_used = sinfo->bytes_used; | |
4416 | spin_unlock(&sinfo->lock); | |
33b4d47f | 4417 | |
8929ecfa YZ |
4418 | sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
4419 | spin_lock(&sinfo->lock); | |
6d48755d JB |
4420 | if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) |
4421 | data_used = 0; | |
8929ecfa YZ |
4422 | meta_used = sinfo->bytes_used; |
4423 | spin_unlock(&sinfo->lock); | |
ab6e2410 | 4424 | |
8929ecfa YZ |
4425 | num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) * |
4426 | csum_size * 2; | |
4427 | num_bytes += div64_u64(data_used + meta_used, 50); | |
4e06bdd6 | 4428 | |
8929ecfa | 4429 | if (num_bytes * 3 > meta_used) |
8e62c2de | 4430 | num_bytes = div64_u64(meta_used, 3); |
ab6e2410 | 4431 | |
8929ecfa YZ |
4432 | return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10); |
4433 | } | |
6a63209f | 4434 | |
8929ecfa YZ |
4435 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
4436 | { | |
4437 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
4438 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
4439 | u64 num_bytes; | |
6a63209f | 4440 | |
8929ecfa | 4441 | num_bytes = calc_global_metadata_size(fs_info); |
33b4d47f | 4442 | |
8929ecfa | 4443 | spin_lock(&sinfo->lock); |
1f699d38 | 4444 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 4445 | |
fdf30d1c | 4446 | block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); |
4e06bdd6 | 4447 | |
8929ecfa | 4448 | num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + |
6d48755d JB |
4449 | sinfo->bytes_reserved + sinfo->bytes_readonly + |
4450 | sinfo->bytes_may_use; | |
8929ecfa YZ |
4451 | |
4452 | if (sinfo->total_bytes > num_bytes) { | |
4453 | num_bytes = sinfo->total_bytes - num_bytes; | |
4454 | block_rsv->reserved += num_bytes; | |
fb25e914 | 4455 | sinfo->bytes_may_use += num_bytes; |
8c2a3ca2 | 4456 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4457 | sinfo->flags, num_bytes, 1); |
6a63209f | 4458 | } |
6a63209f | 4459 | |
8929ecfa YZ |
4460 | if (block_rsv->reserved >= block_rsv->size) { |
4461 | num_bytes = block_rsv->reserved - block_rsv->size; | |
fb25e914 | 4462 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 4463 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4464 | sinfo->flags, num_bytes, 0); |
36e39c40 | 4465 | sinfo->reservation_progress++; |
8929ecfa YZ |
4466 | block_rsv->reserved = block_rsv->size; |
4467 | block_rsv->full = 1; | |
4468 | } | |
182608c8 | 4469 | |
8929ecfa | 4470 | spin_unlock(&block_rsv->lock); |
1f699d38 | 4471 | spin_unlock(&sinfo->lock); |
6a63209f JB |
4472 | } |
4473 | ||
f0486c68 | 4474 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4475 | { |
f0486c68 | 4476 | struct btrfs_space_info *space_info; |
6a63209f | 4477 | |
f0486c68 YZ |
4478 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
4479 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 4480 | |
f0486c68 | 4481 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 4482 | fs_info->global_block_rsv.space_info = space_info; |
8929ecfa | 4483 | fs_info->delalloc_block_rsv.space_info = space_info; |
f0486c68 YZ |
4484 | fs_info->trans_block_rsv.space_info = space_info; |
4485 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 4486 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 4487 | |
8929ecfa YZ |
4488 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
4489 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
4490 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
4491 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 4492 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 4493 | |
8929ecfa | 4494 | update_global_block_rsv(fs_info); |
6a63209f JB |
4495 | } |
4496 | ||
8929ecfa | 4497 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 4498 | { |
8c2a3ca2 JB |
4499 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
4500 | (u64)-1); | |
8929ecfa YZ |
4501 | WARN_ON(fs_info->delalloc_block_rsv.size > 0); |
4502 | WARN_ON(fs_info->delalloc_block_rsv.reserved > 0); | |
4503 | WARN_ON(fs_info->trans_block_rsv.size > 0); | |
4504 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
4505 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
4506 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
4507 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
4508 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
4509 | } |
4510 | ||
a22285a6 YZ |
4511 | void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
4512 | struct btrfs_root *root) | |
6a63209f | 4513 | { |
0e721106 JB |
4514 | if (!trans->block_rsv) |
4515 | return; | |
4516 | ||
a22285a6 YZ |
4517 | if (!trans->bytes_reserved) |
4518 | return; | |
6a63209f | 4519 | |
e77266e4 | 4520 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 4521 | trans->transid, trans->bytes_reserved, 0); |
b24e03db | 4522 | btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved); |
a22285a6 YZ |
4523 | trans->bytes_reserved = 0; |
4524 | } | |
6a63209f | 4525 | |
79787eaa | 4526 | /* Can only return 0 or -ENOSPC */ |
d68fc57b YZ |
4527 | int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
4528 | struct inode *inode) | |
4529 | { | |
4530 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4531 | struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root); | |
4532 | struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv; | |
4533 | ||
4534 | /* | |
fcb80c2a JB |
4535 | * We need to hold space in order to delete our orphan item once we've |
4536 | * added it, so this takes the reservation so we can release it later | |
4537 | * when we are truly done with the orphan item. | |
d68fc57b | 4538 | */ |
ff5714cc | 4539 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4540 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4541 | btrfs_ino(inode), num_bytes, 1); | |
d68fc57b | 4542 | return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); |
6a63209f JB |
4543 | } |
4544 | ||
d68fc57b | 4545 | void btrfs_orphan_release_metadata(struct inode *inode) |
97e728d4 | 4546 | { |
d68fc57b | 4547 | struct btrfs_root *root = BTRFS_I(inode)->root; |
ff5714cc | 4548 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1); |
8c2a3ca2 JB |
4549 | trace_btrfs_space_reservation(root->fs_info, "orphan", |
4550 | btrfs_ino(inode), num_bytes, 0); | |
d68fc57b YZ |
4551 | btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes); |
4552 | } | |
97e728d4 | 4553 | |
d5c12070 MX |
4554 | /* |
4555 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
4556 | * root: the root of the parent directory | |
4557 | * rsv: block reservation | |
4558 | * items: the number of items that we need do reservation | |
4559 | * qgroup_reserved: used to return the reserved size in qgroup | |
4560 | * | |
4561 | * This function is used to reserve the space for snapshot/subvolume | |
4562 | * creation and deletion. Those operations are different with the | |
4563 | * common file/directory operations, they change two fs/file trees | |
4564 | * and root tree, the number of items that the qgroup reserves is | |
4565 | * different with the free space reservation. So we can not use | |
4566 | * the space reseravtion mechanism in start_transaction(). | |
4567 | */ | |
4568 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
4569 | struct btrfs_block_rsv *rsv, | |
4570 | int items, | |
4571 | u64 *qgroup_reserved) | |
a22285a6 | 4572 | { |
d5c12070 MX |
4573 | u64 num_bytes; |
4574 | int ret; | |
4575 | ||
4576 | if (root->fs_info->quota_enabled) { | |
4577 | /* One for parent inode, two for dir entries */ | |
4578 | num_bytes = 3 * root->leafsize; | |
4579 | ret = btrfs_qgroup_reserve(root, num_bytes); | |
4580 | if (ret) | |
4581 | return ret; | |
4582 | } else { | |
4583 | num_bytes = 0; | |
4584 | } | |
4585 | ||
4586 | *qgroup_reserved = num_bytes; | |
4587 | ||
4588 | num_bytes = btrfs_calc_trans_metadata_size(root, items); | |
4589 | rsv->space_info = __find_space_info(root->fs_info, | |
4590 | BTRFS_BLOCK_GROUP_METADATA); | |
4591 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
4592 | BTRFS_RESERVE_FLUSH_ALL); | |
4593 | if (ret) { | |
4594 | if (*qgroup_reserved) | |
4595 | btrfs_qgroup_free(root, *qgroup_reserved); | |
4596 | } | |
4597 | ||
4598 | return ret; | |
4599 | } | |
4600 | ||
4601 | void btrfs_subvolume_release_metadata(struct btrfs_root *root, | |
4602 | struct btrfs_block_rsv *rsv, | |
4603 | u64 qgroup_reserved) | |
4604 | { | |
4605 | btrfs_block_rsv_release(root, rsv, (u64)-1); | |
4606 | if (qgroup_reserved) | |
4607 | btrfs_qgroup_free(root, qgroup_reserved); | |
97e728d4 JB |
4608 | } |
4609 | ||
7709cde3 JB |
4610 | /** |
4611 | * drop_outstanding_extent - drop an outstanding extent | |
4612 | * @inode: the inode we're dropping the extent for | |
4613 | * | |
4614 | * This is called when we are freeing up an outstanding extent, either called | |
4615 | * after an error or after an extent is written. This will return the number of | |
4616 | * reserved extents that need to be freed. This must be called with | |
4617 | * BTRFS_I(inode)->lock held. | |
4618 | */ | |
9e0baf60 JB |
4619 | static unsigned drop_outstanding_extent(struct inode *inode) |
4620 | { | |
7fd2ae21 | 4621 | unsigned drop_inode_space = 0; |
9e0baf60 JB |
4622 | unsigned dropped_extents = 0; |
4623 | ||
9e0baf60 JB |
4624 | BUG_ON(!BTRFS_I(inode)->outstanding_extents); |
4625 | BTRFS_I(inode)->outstanding_extents--; | |
4626 | ||
7fd2ae21 | 4627 | if (BTRFS_I(inode)->outstanding_extents == 0 && |
72ac3c0d JB |
4628 | test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4629 | &BTRFS_I(inode)->runtime_flags)) | |
7fd2ae21 | 4630 | drop_inode_space = 1; |
7fd2ae21 | 4631 | |
9e0baf60 JB |
4632 | /* |
4633 | * If we have more or the same amount of outsanding extents than we have | |
4634 | * reserved then we need to leave the reserved extents count alone. | |
4635 | */ | |
4636 | if (BTRFS_I(inode)->outstanding_extents >= | |
4637 | BTRFS_I(inode)->reserved_extents) | |
7fd2ae21 | 4638 | return drop_inode_space; |
9e0baf60 JB |
4639 | |
4640 | dropped_extents = BTRFS_I(inode)->reserved_extents - | |
4641 | BTRFS_I(inode)->outstanding_extents; | |
4642 | BTRFS_I(inode)->reserved_extents -= dropped_extents; | |
7fd2ae21 | 4643 | return dropped_extents + drop_inode_space; |
9e0baf60 JB |
4644 | } |
4645 | ||
7709cde3 JB |
4646 | /** |
4647 | * calc_csum_metadata_size - return the amount of metada space that must be | |
4648 | * reserved/free'd for the given bytes. | |
4649 | * @inode: the inode we're manipulating | |
4650 | * @num_bytes: the number of bytes in question | |
4651 | * @reserve: 1 if we are reserving space, 0 if we are freeing space | |
4652 | * | |
4653 | * This adjusts the number of csum_bytes in the inode and then returns the | |
4654 | * correct amount of metadata that must either be reserved or freed. We | |
4655 | * calculate how many checksums we can fit into one leaf and then divide the | |
4656 | * number of bytes that will need to be checksumed by this value to figure out | |
4657 | * how many checksums will be required. If we are adding bytes then the number | |
4658 | * may go up and we will return the number of additional bytes that must be | |
4659 | * reserved. If it is going down we will return the number of bytes that must | |
4660 | * be freed. | |
4661 | * | |
4662 | * This must be called with BTRFS_I(inode)->lock held. | |
4663 | */ | |
4664 | static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes, | |
4665 | int reserve) | |
6324fbf3 | 4666 | { |
7709cde3 JB |
4667 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4668 | u64 csum_size; | |
4669 | int num_csums_per_leaf; | |
4670 | int num_csums; | |
4671 | int old_csums; | |
4672 | ||
4673 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM && | |
4674 | BTRFS_I(inode)->csum_bytes == 0) | |
4675 | return 0; | |
4676 | ||
4677 | old_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4678 | if (reserve) | |
4679 | BTRFS_I(inode)->csum_bytes += num_bytes; | |
4680 | else | |
4681 | BTRFS_I(inode)->csum_bytes -= num_bytes; | |
4682 | csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item); | |
4683 | num_csums_per_leaf = (int)div64_u64(csum_size, | |
4684 | sizeof(struct btrfs_csum_item) + | |
4685 | sizeof(struct btrfs_disk_key)); | |
4686 | num_csums = (int)div64_u64(BTRFS_I(inode)->csum_bytes, root->sectorsize); | |
4687 | num_csums = num_csums + num_csums_per_leaf - 1; | |
4688 | num_csums = num_csums / num_csums_per_leaf; | |
4689 | ||
4690 | old_csums = old_csums + num_csums_per_leaf - 1; | |
4691 | old_csums = old_csums / num_csums_per_leaf; | |
4692 | ||
4693 | /* No change, no need to reserve more */ | |
4694 | if (old_csums == num_csums) | |
4695 | return 0; | |
4696 | ||
4697 | if (reserve) | |
4698 | return btrfs_calc_trans_metadata_size(root, | |
4699 | num_csums - old_csums); | |
4700 | ||
4701 | return btrfs_calc_trans_metadata_size(root, old_csums - num_csums); | |
0ca1f7ce | 4702 | } |
c146afad | 4703 | |
0ca1f7ce YZ |
4704 | int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) |
4705 | { | |
4706 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4707 | struct btrfs_block_rsv *block_rsv = &root->fs_info->delalloc_block_rsv; | |
9e0baf60 | 4708 | u64 to_reserve = 0; |
660d3f6c | 4709 | u64 csum_bytes; |
9e0baf60 | 4710 | unsigned nr_extents = 0; |
660d3f6c | 4711 | int extra_reserve = 0; |
08e007d2 | 4712 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 4713 | int ret = 0; |
c64c2bd8 | 4714 | bool delalloc_lock = true; |
88e081bf WS |
4715 | u64 to_free = 0; |
4716 | unsigned dropped; | |
6324fbf3 | 4717 | |
c64c2bd8 JB |
4718 | /* If we are a free space inode we need to not flush since we will be in |
4719 | * the middle of a transaction commit. We also don't need the delalloc | |
4720 | * mutex since we won't race with anybody. We need this mostly to make | |
4721 | * lockdep shut its filthy mouth. | |
4722 | */ | |
4723 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 4724 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 JB |
4725 | delalloc_lock = false; |
4726 | } | |
c09544e0 | 4727 | |
08e007d2 MX |
4728 | if (flush != BTRFS_RESERVE_NO_FLUSH && |
4729 | btrfs_transaction_in_commit(root->fs_info)) | |
0ca1f7ce | 4730 | schedule_timeout(1); |
ec44a35c | 4731 | |
c64c2bd8 JB |
4732 | if (delalloc_lock) |
4733 | mutex_lock(&BTRFS_I(inode)->delalloc_mutex); | |
4734 | ||
0ca1f7ce | 4735 | num_bytes = ALIGN(num_bytes, root->sectorsize); |
8bb8ab2e | 4736 | |
9e0baf60 JB |
4737 | spin_lock(&BTRFS_I(inode)->lock); |
4738 | BTRFS_I(inode)->outstanding_extents++; | |
4739 | ||
4740 | if (BTRFS_I(inode)->outstanding_extents > | |
660d3f6c | 4741 | BTRFS_I(inode)->reserved_extents) |
9e0baf60 JB |
4742 | nr_extents = BTRFS_I(inode)->outstanding_extents - |
4743 | BTRFS_I(inode)->reserved_extents; | |
57a45ced | 4744 | |
7fd2ae21 JB |
4745 | /* |
4746 | * Add an item to reserve for updating the inode when we complete the | |
4747 | * delalloc io. | |
4748 | */ | |
72ac3c0d JB |
4749 | if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4750 | &BTRFS_I(inode)->runtime_flags)) { | |
7fd2ae21 | 4751 | nr_extents++; |
660d3f6c | 4752 | extra_reserve = 1; |
593060d7 | 4753 | } |
7fd2ae21 JB |
4754 | |
4755 | to_reserve = btrfs_calc_trans_metadata_size(root, nr_extents); | |
7709cde3 | 4756 | to_reserve += calc_csum_metadata_size(inode, num_bytes, 1); |
660d3f6c | 4757 | csum_bytes = BTRFS_I(inode)->csum_bytes; |
9e0baf60 | 4758 | spin_unlock(&BTRFS_I(inode)->lock); |
57a45ced | 4759 | |
88e081bf | 4760 | if (root->fs_info->quota_enabled) { |
c5567237 AJ |
4761 | ret = btrfs_qgroup_reserve(root, num_bytes + |
4762 | nr_extents * root->leafsize); | |
88e081bf WS |
4763 | if (ret) |
4764 | goto out_fail; | |
4765 | } | |
c5567237 | 4766 | |
88e081bf WS |
4767 | ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); |
4768 | if (unlikely(ret)) { | |
4769 | if (root->fs_info->quota_enabled) | |
4b5829a8 MX |
4770 | btrfs_qgroup_free(root, num_bytes + |
4771 | nr_extents * root->leafsize); | |
88e081bf | 4772 | goto out_fail; |
9e0baf60 | 4773 | } |
25179201 | 4774 | |
660d3f6c JB |
4775 | spin_lock(&BTRFS_I(inode)->lock); |
4776 | if (extra_reserve) { | |
72ac3c0d JB |
4777 | set_bit(BTRFS_INODE_DELALLOC_META_RESERVED, |
4778 | &BTRFS_I(inode)->runtime_flags); | |
660d3f6c JB |
4779 | nr_extents--; |
4780 | } | |
4781 | BTRFS_I(inode)->reserved_extents += nr_extents; | |
4782 | spin_unlock(&BTRFS_I(inode)->lock); | |
c64c2bd8 JB |
4783 | |
4784 | if (delalloc_lock) | |
4785 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
660d3f6c | 4786 | |
8c2a3ca2 JB |
4787 | if (to_reserve) |
4788 | trace_btrfs_space_reservation(root->fs_info,"delalloc", | |
4789 | btrfs_ino(inode), to_reserve, 1); | |
0ca1f7ce YZ |
4790 | block_rsv_add_bytes(block_rsv, to_reserve, 1); |
4791 | ||
0ca1f7ce | 4792 | return 0; |
88e081bf WS |
4793 | |
4794 | out_fail: | |
4795 | spin_lock(&BTRFS_I(inode)->lock); | |
4796 | dropped = drop_outstanding_extent(inode); | |
4797 | /* | |
4798 | * If the inodes csum_bytes is the same as the original | |
4799 | * csum_bytes then we know we haven't raced with any free()ers | |
4800 | * so we can just reduce our inodes csum bytes and carry on. | |
88e081bf | 4801 | */ |
f4881bc7 | 4802 | if (BTRFS_I(inode)->csum_bytes == csum_bytes) { |
88e081bf | 4803 | calc_csum_metadata_size(inode, num_bytes, 0); |
f4881bc7 JB |
4804 | } else { |
4805 | u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes; | |
4806 | u64 bytes; | |
4807 | ||
4808 | /* | |
4809 | * This is tricky, but first we need to figure out how much we | |
4810 | * free'd from any free-ers that occured during this | |
4811 | * reservation, so we reset ->csum_bytes to the csum_bytes | |
4812 | * before we dropped our lock, and then call the free for the | |
4813 | * number of bytes that were freed while we were trying our | |
4814 | * reservation. | |
4815 | */ | |
4816 | bytes = csum_bytes - BTRFS_I(inode)->csum_bytes; | |
4817 | BTRFS_I(inode)->csum_bytes = csum_bytes; | |
4818 | to_free = calc_csum_metadata_size(inode, bytes, 0); | |
4819 | ||
4820 | ||
4821 | /* | |
4822 | * Now we need to see how much we would have freed had we not | |
4823 | * been making this reservation and our ->csum_bytes were not | |
4824 | * artificially inflated. | |
4825 | */ | |
4826 | BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes; | |
4827 | bytes = csum_bytes - orig_csum_bytes; | |
4828 | bytes = calc_csum_metadata_size(inode, bytes, 0); | |
4829 | ||
4830 | /* | |
4831 | * Now reset ->csum_bytes to what it should be. If bytes is | |
4832 | * more than to_free then we would have free'd more space had we | |
4833 | * not had an artificially high ->csum_bytes, so we need to free | |
4834 | * the remainder. If bytes is the same or less then we don't | |
4835 | * need to do anything, the other free-ers did the correct | |
4836 | * thing. | |
4837 | */ | |
4838 | BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes; | |
4839 | if (bytes > to_free) | |
4840 | to_free = bytes - to_free; | |
4841 | else | |
4842 | to_free = 0; | |
4843 | } | |
88e081bf WS |
4844 | spin_unlock(&BTRFS_I(inode)->lock); |
4845 | if (dropped) | |
4846 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
4847 | ||
4848 | if (to_free) { | |
4849 | btrfs_block_rsv_release(root, block_rsv, to_free); | |
4850 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
4851 | btrfs_ino(inode), to_free, 0); | |
4852 | } | |
4853 | if (delalloc_lock) | |
4854 | mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); | |
4855 | return ret; | |
0ca1f7ce YZ |
4856 | } |
4857 | ||
7709cde3 JB |
4858 | /** |
4859 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
4860 | * @inode: the inode to release the reservation for | |
4861 | * @num_bytes: the number of bytes we're releasing | |
4862 | * | |
4863 | * This will release the metadata reservation for an inode. This can be called | |
4864 | * once we complete IO for a given set of bytes to release their metadata | |
4865 | * reservations. | |
4866 | */ | |
0ca1f7ce YZ |
4867 | void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) |
4868 | { | |
4869 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
9e0baf60 JB |
4870 | u64 to_free = 0; |
4871 | unsigned dropped; | |
0ca1f7ce YZ |
4872 | |
4873 | num_bytes = ALIGN(num_bytes, root->sectorsize); | |
7709cde3 | 4874 | spin_lock(&BTRFS_I(inode)->lock); |
9e0baf60 | 4875 | dropped = drop_outstanding_extent(inode); |
97e728d4 | 4876 | |
0934856d MX |
4877 | if (num_bytes) |
4878 | to_free = calc_csum_metadata_size(inode, num_bytes, 0); | |
7709cde3 | 4879 | spin_unlock(&BTRFS_I(inode)->lock); |
9e0baf60 JB |
4880 | if (dropped > 0) |
4881 | to_free += btrfs_calc_trans_metadata_size(root, dropped); | |
0ca1f7ce | 4882 | |
8c2a3ca2 JB |
4883 | trace_btrfs_space_reservation(root->fs_info, "delalloc", |
4884 | btrfs_ino(inode), to_free, 0); | |
c5567237 AJ |
4885 | if (root->fs_info->quota_enabled) { |
4886 | btrfs_qgroup_free(root, num_bytes + | |
4887 | dropped * root->leafsize); | |
4888 | } | |
4889 | ||
0ca1f7ce YZ |
4890 | btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, |
4891 | to_free); | |
4892 | } | |
4893 | ||
7709cde3 JB |
4894 | /** |
4895 | * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc | |
4896 | * @inode: inode we're writing to | |
4897 | * @num_bytes: the number of bytes we want to allocate | |
4898 | * | |
4899 | * This will do the following things | |
4900 | * | |
4901 | * o reserve space in the data space info for num_bytes | |
4902 | * o reserve space in the metadata space info based on number of outstanding | |
4903 | * extents and how much csums will be needed | |
4904 | * o add to the inodes ->delalloc_bytes | |
4905 | * o add it to the fs_info's delalloc inodes list. | |
4906 | * | |
4907 | * This will return 0 for success and -ENOSPC if there is no space left. | |
4908 | */ | |
0ca1f7ce YZ |
4909 | int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) |
4910 | { | |
4911 | int ret; | |
4912 | ||
4913 | ret = btrfs_check_data_free_space(inode, num_bytes); | |
d397712b | 4914 | if (ret) |
0ca1f7ce YZ |
4915 | return ret; |
4916 | ||
4917 | ret = btrfs_delalloc_reserve_metadata(inode, num_bytes); | |
4918 | if (ret) { | |
4919 | btrfs_free_reserved_data_space(inode, num_bytes); | |
4920 | return ret; | |
4921 | } | |
4922 | ||
4923 | return 0; | |
4924 | } | |
4925 | ||
7709cde3 JB |
4926 | /** |
4927 | * btrfs_delalloc_release_space - release data and metadata space for delalloc | |
4928 | * @inode: inode we're releasing space for | |
4929 | * @num_bytes: the number of bytes we want to free up | |
4930 | * | |
4931 | * This must be matched with a call to btrfs_delalloc_reserve_space. This is | |
4932 | * called in the case that we don't need the metadata AND data reservations | |
4933 | * anymore. So if there is an error or we insert an inline extent. | |
4934 | * | |
4935 | * This function will release the metadata space that was not used and will | |
4936 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
4937 | * list if there are no delalloc bytes left. | |
4938 | */ | |
0ca1f7ce YZ |
4939 | void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes) |
4940 | { | |
4941 | btrfs_delalloc_release_metadata(inode, num_bytes); | |
4942 | btrfs_free_reserved_data_space(inode, num_bytes); | |
6324fbf3 CM |
4943 | } |
4944 | ||
c53d613e | 4945 | static int update_block_group(struct btrfs_root *root, |
f0486c68 | 4946 | u64 bytenr, u64 num_bytes, int alloc) |
9078a3e1 | 4947 | { |
0af3d00b | 4948 | struct btrfs_block_group_cache *cache = NULL; |
9078a3e1 | 4949 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 4950 | u64 total = num_bytes; |
9078a3e1 | 4951 | u64 old_val; |
db94535d | 4952 | u64 byte_in_group; |
0af3d00b | 4953 | int factor; |
3e1ad54f | 4954 | |
5d4f98a2 YZ |
4955 | /* block accounting for super block */ |
4956 | spin_lock(&info->delalloc_lock); | |
6c41761f | 4957 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
4958 | if (alloc) |
4959 | old_val += num_bytes; | |
4960 | else | |
4961 | old_val -= num_bytes; | |
6c41761f | 4962 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
5d4f98a2 YZ |
4963 | spin_unlock(&info->delalloc_lock); |
4964 | ||
d397712b | 4965 | while (total) { |
db94535d | 4966 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 4967 | if (!cache) |
79787eaa | 4968 | return -ENOENT; |
b742bb82 YZ |
4969 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
4970 | BTRFS_BLOCK_GROUP_RAID1 | | |
4971 | BTRFS_BLOCK_GROUP_RAID10)) | |
4972 | factor = 2; | |
4973 | else | |
4974 | factor = 1; | |
9d66e233 JB |
4975 | /* |
4976 | * If this block group has free space cache written out, we | |
4977 | * need to make sure to load it if we are removing space. This | |
4978 | * is because we need the unpinning stage to actually add the | |
4979 | * space back to the block group, otherwise we will leak space. | |
4980 | */ | |
4981 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 4982 | cache_block_group(cache, 1); |
0af3d00b | 4983 | |
db94535d CM |
4984 | byte_in_group = bytenr - cache->key.objectid; |
4985 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 4986 | |
25179201 | 4987 | spin_lock(&cache->space_info->lock); |
c286ac48 | 4988 | spin_lock(&cache->lock); |
0af3d00b | 4989 | |
73bc1876 | 4990 | if (btrfs_test_opt(root, SPACE_CACHE) && |
0af3d00b JB |
4991 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
4992 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
4993 | ||
0f9dd46c | 4994 | cache->dirty = 1; |
9078a3e1 | 4995 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 4996 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 4997 | if (alloc) { |
db94535d | 4998 | old_val += num_bytes; |
11833d66 YZ |
4999 | btrfs_set_block_group_used(&cache->item, old_val); |
5000 | cache->reserved -= num_bytes; | |
11833d66 | 5001 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
5002 | cache->space_info->bytes_used += num_bytes; |
5003 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 5004 | spin_unlock(&cache->lock); |
25179201 | 5005 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 5006 | } else { |
db94535d | 5007 | old_val -= num_bytes; |
c286ac48 | 5008 | btrfs_set_block_group_used(&cache->item, old_val); |
f0486c68 YZ |
5009 | cache->pinned += num_bytes; |
5010 | cache->space_info->bytes_pinned += num_bytes; | |
6324fbf3 | 5011 | cache->space_info->bytes_used -= num_bytes; |
b742bb82 | 5012 | cache->space_info->disk_used -= num_bytes * factor; |
c286ac48 | 5013 | spin_unlock(&cache->lock); |
25179201 | 5014 | spin_unlock(&cache->space_info->lock); |
1f3c79a2 | 5015 | |
f0486c68 YZ |
5016 | set_extent_dirty(info->pinned_extents, |
5017 | bytenr, bytenr + num_bytes - 1, | |
5018 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 5019 | } |
fa9c0d79 | 5020 | btrfs_put_block_group(cache); |
db94535d CM |
5021 | total -= num_bytes; |
5022 | bytenr += num_bytes; | |
9078a3e1 CM |
5023 | } |
5024 | return 0; | |
5025 | } | |
6324fbf3 | 5026 | |
a061fc8d CM |
5027 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
5028 | { | |
0f9dd46c | 5029 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 5030 | u64 bytenr; |
0f9dd46c | 5031 | |
a1897fdd LB |
5032 | spin_lock(&root->fs_info->block_group_cache_lock); |
5033 | bytenr = root->fs_info->first_logical_byte; | |
5034 | spin_unlock(&root->fs_info->block_group_cache_lock); | |
5035 | ||
5036 | if (bytenr < (u64)-1) | |
5037 | return bytenr; | |
5038 | ||
0f9dd46c JB |
5039 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
5040 | if (!cache) | |
a061fc8d | 5041 | return 0; |
0f9dd46c | 5042 | |
d2fb3437 | 5043 | bytenr = cache->key.objectid; |
fa9c0d79 | 5044 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
5045 | |
5046 | return bytenr; | |
a061fc8d CM |
5047 | } |
5048 | ||
f0486c68 YZ |
5049 | static int pin_down_extent(struct btrfs_root *root, |
5050 | struct btrfs_block_group_cache *cache, | |
5051 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 5052 | { |
11833d66 YZ |
5053 | spin_lock(&cache->space_info->lock); |
5054 | spin_lock(&cache->lock); | |
5055 | cache->pinned += num_bytes; | |
5056 | cache->space_info->bytes_pinned += num_bytes; | |
5057 | if (reserved) { | |
5058 | cache->reserved -= num_bytes; | |
5059 | cache->space_info->bytes_reserved -= num_bytes; | |
5060 | } | |
5061 | spin_unlock(&cache->lock); | |
5062 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 5063 | |
f0486c68 YZ |
5064 | set_extent_dirty(root->fs_info->pinned_extents, bytenr, |
5065 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); | |
5066 | return 0; | |
5067 | } | |
68b38550 | 5068 | |
f0486c68 YZ |
5069 | /* |
5070 | * this function must be called within transaction | |
5071 | */ | |
5072 | int btrfs_pin_extent(struct btrfs_root *root, | |
5073 | u64 bytenr, u64 num_bytes, int reserved) | |
5074 | { | |
5075 | struct btrfs_block_group_cache *cache; | |
68b38550 | 5076 | |
f0486c68 | 5077 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); |
79787eaa | 5078 | BUG_ON(!cache); /* Logic error */ |
f0486c68 YZ |
5079 | |
5080 | pin_down_extent(root, cache, bytenr, num_bytes, reserved); | |
5081 | ||
5082 | btrfs_put_block_group(cache); | |
11833d66 YZ |
5083 | return 0; |
5084 | } | |
5085 | ||
f0486c68 | 5086 | /* |
e688b725 CM |
5087 | * this function must be called within transaction |
5088 | */ | |
dcfac415 | 5089 | int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, |
e688b725 CM |
5090 | u64 bytenr, u64 num_bytes) |
5091 | { | |
5092 | struct btrfs_block_group_cache *cache; | |
5093 | ||
5094 | cache = btrfs_lookup_block_group(root->fs_info, bytenr); | |
79787eaa | 5095 | BUG_ON(!cache); /* Logic error */ |
e688b725 CM |
5096 | |
5097 | /* | |
5098 | * pull in the free space cache (if any) so that our pin | |
5099 | * removes the free space from the cache. We have load_only set | |
5100 | * to one because the slow code to read in the free extents does check | |
5101 | * the pinned extents. | |
5102 | */ | |
f6373bf3 | 5103 | cache_block_group(cache, 1); |
e688b725 CM |
5104 | |
5105 | pin_down_extent(root, cache, bytenr, num_bytes, 0); | |
5106 | ||
5107 | /* remove us from the free space cache (if we're there at all) */ | |
5108 | btrfs_remove_free_space(cache, bytenr, num_bytes); | |
5109 | btrfs_put_block_group(cache); | |
5110 | return 0; | |
5111 | } | |
5112 | ||
fb25e914 JB |
5113 | /** |
5114 | * btrfs_update_reserved_bytes - update the block_group and space info counters | |
5115 | * @cache: The cache we are manipulating | |
5116 | * @num_bytes: The number of bytes in question | |
5117 | * @reserve: One of the reservation enums | |
5118 | * | |
5119 | * This is called by the allocator when it reserves space, or by somebody who is | |
5120 | * freeing space that was never actually used on disk. For example if you | |
5121 | * reserve some space for a new leaf in transaction A and before transaction A | |
5122 | * commits you free that leaf, you call this with reserve set to 0 in order to | |
5123 | * clear the reservation. | |
5124 | * | |
5125 | * Metadata reservations should be called with RESERVE_ALLOC so we do the proper | |
5126 | * ENOSPC accounting. For data we handle the reservation through clearing the | |
5127 | * delalloc bits in the io_tree. We have to do this since we could end up | |
5128 | * allocating less disk space for the amount of data we have reserved in the | |
5129 | * case of compression. | |
5130 | * | |
5131 | * If this is a reservation and the block group has become read only we cannot | |
5132 | * make the reservation and return -EAGAIN, otherwise this function always | |
5133 | * succeeds. | |
f0486c68 | 5134 | */ |
fb25e914 JB |
5135 | static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, |
5136 | u64 num_bytes, int reserve) | |
11833d66 | 5137 | { |
fb25e914 | 5138 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 5139 | int ret = 0; |
79787eaa | 5140 | |
fb25e914 JB |
5141 | spin_lock(&space_info->lock); |
5142 | spin_lock(&cache->lock); | |
5143 | if (reserve != RESERVE_FREE) { | |
f0486c68 YZ |
5144 | if (cache->ro) { |
5145 | ret = -EAGAIN; | |
5146 | } else { | |
fb25e914 JB |
5147 | cache->reserved += num_bytes; |
5148 | space_info->bytes_reserved += num_bytes; | |
5149 | if (reserve == RESERVE_ALLOC) { | |
8c2a3ca2 | 5150 | trace_btrfs_space_reservation(cache->fs_info, |
2bcc0328 LB |
5151 | "space_info", space_info->flags, |
5152 | num_bytes, 0); | |
fb25e914 JB |
5153 | space_info->bytes_may_use -= num_bytes; |
5154 | } | |
f0486c68 | 5155 | } |
fb25e914 JB |
5156 | } else { |
5157 | if (cache->ro) | |
5158 | space_info->bytes_readonly += num_bytes; | |
5159 | cache->reserved -= num_bytes; | |
5160 | space_info->bytes_reserved -= num_bytes; | |
5161 | space_info->reservation_progress++; | |
324ae4df | 5162 | } |
fb25e914 JB |
5163 | spin_unlock(&cache->lock); |
5164 | spin_unlock(&space_info->lock); | |
f0486c68 | 5165 | return ret; |
324ae4df | 5166 | } |
9078a3e1 | 5167 | |
143bede5 | 5168 | void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
11833d66 | 5169 | struct btrfs_root *root) |
e8569813 | 5170 | { |
e8569813 | 5171 | struct btrfs_fs_info *fs_info = root->fs_info; |
11833d66 YZ |
5172 | struct btrfs_caching_control *next; |
5173 | struct btrfs_caching_control *caching_ctl; | |
5174 | struct btrfs_block_group_cache *cache; | |
e8569813 | 5175 | |
11833d66 | 5176 | down_write(&fs_info->extent_commit_sem); |
25179201 | 5177 | |
11833d66 YZ |
5178 | list_for_each_entry_safe(caching_ctl, next, |
5179 | &fs_info->caching_block_groups, list) { | |
5180 | cache = caching_ctl->block_group; | |
5181 | if (block_group_cache_done(cache)) { | |
5182 | cache->last_byte_to_unpin = (u64)-1; | |
5183 | list_del_init(&caching_ctl->list); | |
5184 | put_caching_control(caching_ctl); | |
e8569813 | 5185 | } else { |
11833d66 | 5186 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 5187 | } |
e8569813 | 5188 | } |
11833d66 YZ |
5189 | |
5190 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
5191 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
5192 | else | |
5193 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
5194 | ||
5195 | up_write(&fs_info->extent_commit_sem); | |
8929ecfa YZ |
5196 | |
5197 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
5198 | } |
5199 | ||
11833d66 | 5200 | static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
ccd467d6 | 5201 | { |
11833d66 YZ |
5202 | struct btrfs_fs_info *fs_info = root->fs_info; |
5203 | struct btrfs_block_group_cache *cache = NULL; | |
7b398f8e JB |
5204 | struct btrfs_space_info *space_info; |
5205 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
11833d66 | 5206 | u64 len; |
7b398f8e | 5207 | bool readonly; |
ccd467d6 | 5208 | |
11833d66 | 5209 | while (start <= end) { |
7b398f8e | 5210 | readonly = false; |
11833d66 YZ |
5211 | if (!cache || |
5212 | start >= cache->key.objectid + cache->key.offset) { | |
5213 | if (cache) | |
5214 | btrfs_put_block_group(cache); | |
5215 | cache = btrfs_lookup_block_group(fs_info, start); | |
79787eaa | 5216 | BUG_ON(!cache); /* Logic error */ |
11833d66 YZ |
5217 | } |
5218 | ||
5219 | len = cache->key.objectid + cache->key.offset - start; | |
5220 | len = min(len, end + 1 - start); | |
5221 | ||
5222 | if (start < cache->last_byte_to_unpin) { | |
5223 | len = min(len, cache->last_byte_to_unpin - start); | |
5224 | btrfs_add_free_space(cache, start, len); | |
5225 | } | |
5226 | ||
f0486c68 | 5227 | start += len; |
7b398f8e | 5228 | space_info = cache->space_info; |
f0486c68 | 5229 | |
7b398f8e | 5230 | spin_lock(&space_info->lock); |
11833d66 YZ |
5231 | spin_lock(&cache->lock); |
5232 | cache->pinned -= len; | |
7b398f8e JB |
5233 | space_info->bytes_pinned -= len; |
5234 | if (cache->ro) { | |
5235 | space_info->bytes_readonly += len; | |
5236 | readonly = true; | |
5237 | } | |
11833d66 | 5238 | spin_unlock(&cache->lock); |
7b398f8e JB |
5239 | if (!readonly && global_rsv->space_info == space_info) { |
5240 | spin_lock(&global_rsv->lock); | |
5241 | if (!global_rsv->full) { | |
5242 | len = min(len, global_rsv->size - | |
5243 | global_rsv->reserved); | |
5244 | global_rsv->reserved += len; | |
5245 | space_info->bytes_may_use += len; | |
5246 | if (global_rsv->reserved >= global_rsv->size) | |
5247 | global_rsv->full = 1; | |
5248 | } | |
5249 | spin_unlock(&global_rsv->lock); | |
5250 | } | |
5251 | spin_unlock(&space_info->lock); | |
ccd467d6 | 5252 | } |
11833d66 YZ |
5253 | |
5254 | if (cache) | |
5255 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
5256 | return 0; |
5257 | } | |
5258 | ||
5259 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
11833d66 | 5260 | struct btrfs_root *root) |
a28ec197 | 5261 | { |
11833d66 YZ |
5262 | struct btrfs_fs_info *fs_info = root->fs_info; |
5263 | struct extent_io_tree *unpin; | |
1a5bc167 CM |
5264 | u64 start; |
5265 | u64 end; | |
a28ec197 | 5266 | int ret; |
a28ec197 | 5267 | |
79787eaa JM |
5268 | if (trans->aborted) |
5269 | return 0; | |
5270 | ||
11833d66 YZ |
5271 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
5272 | unpin = &fs_info->freed_extents[1]; | |
5273 | else | |
5274 | unpin = &fs_info->freed_extents[0]; | |
5275 | ||
d397712b | 5276 | while (1) { |
1a5bc167 | 5277 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 5278 | EXTENT_DIRTY, NULL); |
1a5bc167 | 5279 | if (ret) |
a28ec197 | 5280 | break; |
1f3c79a2 | 5281 | |
5378e607 LD |
5282 | if (btrfs_test_opt(root, DISCARD)) |
5283 | ret = btrfs_discard_extent(root, start, | |
5284 | end + 1 - start, NULL); | |
1f3c79a2 | 5285 | |
1a5bc167 | 5286 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
11833d66 | 5287 | unpin_extent_range(root, start, end); |
b9473439 | 5288 | cond_resched(); |
a28ec197 | 5289 | } |
817d52f8 | 5290 | |
e20d96d6 CM |
5291 | return 0; |
5292 | } | |
5293 | ||
5d4f98a2 YZ |
5294 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
5295 | struct btrfs_root *root, | |
5296 | u64 bytenr, u64 num_bytes, u64 parent, | |
5297 | u64 root_objectid, u64 owner_objectid, | |
5298 | u64 owner_offset, int refs_to_drop, | |
5299 | struct btrfs_delayed_extent_op *extent_op) | |
a28ec197 | 5300 | { |
e2fa7227 | 5301 | struct btrfs_key key; |
5d4f98a2 | 5302 | struct btrfs_path *path; |
1261ec42 CM |
5303 | struct btrfs_fs_info *info = root->fs_info; |
5304 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 5305 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
5306 | struct btrfs_extent_item *ei; |
5307 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 5308 | int ret; |
5d4f98a2 | 5309 | int is_data; |
952fccac CM |
5310 | int extent_slot = 0; |
5311 | int found_extent = 0; | |
5312 | int num_to_del = 1; | |
5d4f98a2 YZ |
5313 | u32 item_size; |
5314 | u64 refs; | |
037e6390 | 5315 | |
5caf2a00 | 5316 | path = btrfs_alloc_path(); |
54aa1f4d CM |
5317 | if (!path) |
5318 | return -ENOMEM; | |
5f26f772 | 5319 | |
3c12ac72 | 5320 | path->reada = 1; |
b9473439 | 5321 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5322 | |
5323 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
5324 | BUG_ON(!is_data && refs_to_drop != 1); | |
5325 | ||
5326 | ret = lookup_extent_backref(trans, extent_root, path, &iref, | |
5327 | bytenr, num_bytes, parent, | |
5328 | root_objectid, owner_objectid, | |
5329 | owner_offset); | |
7bb86316 | 5330 | if (ret == 0) { |
952fccac | 5331 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
5332 | while (extent_slot >= 0) { |
5333 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 5334 | extent_slot); |
5d4f98a2 | 5335 | if (key.objectid != bytenr) |
952fccac | 5336 | break; |
5d4f98a2 YZ |
5337 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
5338 | key.offset == num_bytes) { | |
952fccac CM |
5339 | found_extent = 1; |
5340 | break; | |
5341 | } | |
5342 | if (path->slots[0] - extent_slot > 5) | |
5343 | break; | |
5d4f98a2 | 5344 | extent_slot--; |
952fccac | 5345 | } |
5d4f98a2 YZ |
5346 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
5347 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
5348 | if (found_extent && item_size < sizeof(*ei)) | |
5349 | found_extent = 0; | |
5350 | #endif | |
31840ae1 | 5351 | if (!found_extent) { |
5d4f98a2 | 5352 | BUG_ON(iref); |
56bec294 | 5353 | ret = remove_extent_backref(trans, extent_root, path, |
5d4f98a2 YZ |
5354 | NULL, refs_to_drop, |
5355 | is_data); | |
005d6427 DS |
5356 | if (ret) { |
5357 | btrfs_abort_transaction(trans, extent_root, ret); | |
5358 | goto out; | |
5359 | } | |
b3b4aa74 | 5360 | btrfs_release_path(path); |
b9473439 | 5361 | path->leave_spinning = 1; |
5d4f98a2 YZ |
5362 | |
5363 | key.objectid = bytenr; | |
5364 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5365 | key.offset = num_bytes; | |
5366 | ||
31840ae1 ZY |
5367 | ret = btrfs_search_slot(trans, extent_root, |
5368 | &key, path, -1, 1); | |
f3465ca4 JB |
5369 | if (ret) { |
5370 | printk(KERN_ERR "umm, got %d back from search" | |
d397712b CM |
5371 | ", was looking for %llu\n", ret, |
5372 | (unsigned long long)bytenr); | |
b783e62d JB |
5373 | if (ret > 0) |
5374 | btrfs_print_leaf(extent_root, | |
5375 | path->nodes[0]); | |
f3465ca4 | 5376 | } |
005d6427 DS |
5377 | if (ret < 0) { |
5378 | btrfs_abort_transaction(trans, extent_root, ret); | |
5379 | goto out; | |
5380 | } | |
31840ae1 ZY |
5381 | extent_slot = path->slots[0]; |
5382 | } | |
79787eaa | 5383 | } else if (ret == -ENOENT) { |
7bb86316 CM |
5384 | btrfs_print_leaf(extent_root, path->nodes[0]); |
5385 | WARN_ON(1); | |
d397712b | 5386 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
5d4f98a2 | 5387 | "parent %llu root %llu owner %llu offset %llu\n", |
d397712b | 5388 | (unsigned long long)bytenr, |
56bec294 | 5389 | (unsigned long long)parent, |
d397712b | 5390 | (unsigned long long)root_objectid, |
5d4f98a2 YZ |
5391 | (unsigned long long)owner_objectid, |
5392 | (unsigned long long)owner_offset); | |
79787eaa | 5393 | } else { |
005d6427 DS |
5394 | btrfs_abort_transaction(trans, extent_root, ret); |
5395 | goto out; | |
7bb86316 | 5396 | } |
5f39d397 CM |
5397 | |
5398 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
5399 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
5400 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
5401 | if (item_size < sizeof(*ei)) { | |
5402 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
5403 | ret = convert_extent_item_v0(trans, extent_root, path, | |
5404 | owner_objectid, 0); | |
005d6427 DS |
5405 | if (ret < 0) { |
5406 | btrfs_abort_transaction(trans, extent_root, ret); | |
5407 | goto out; | |
5408 | } | |
5d4f98a2 | 5409 | |
b3b4aa74 | 5410 | btrfs_release_path(path); |
5d4f98a2 YZ |
5411 | path->leave_spinning = 1; |
5412 | ||
5413 | key.objectid = bytenr; | |
5414 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
5415 | key.offset = num_bytes; | |
5416 | ||
5417 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
5418 | -1, 1); | |
5419 | if (ret) { | |
5420 | printk(KERN_ERR "umm, got %d back from search" | |
5421 | ", was looking for %llu\n", ret, | |
5422 | (unsigned long long)bytenr); | |
5423 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
5424 | } | |
005d6427 DS |
5425 | if (ret < 0) { |
5426 | btrfs_abort_transaction(trans, extent_root, ret); | |
5427 | goto out; | |
5428 | } | |
5429 | ||
5d4f98a2 YZ |
5430 | extent_slot = path->slots[0]; |
5431 | leaf = path->nodes[0]; | |
5432 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
5433 | } | |
5434 | #endif | |
5435 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 5436 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 5437 | struct btrfs_extent_item); |
5d4f98a2 YZ |
5438 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
5439 | struct btrfs_tree_block_info *bi; | |
5440 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
5441 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
5442 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
5443 | } | |
56bec294 | 5444 | |
5d4f98a2 | 5445 | refs = btrfs_extent_refs(leaf, ei); |
56bec294 CM |
5446 | BUG_ON(refs < refs_to_drop); |
5447 | refs -= refs_to_drop; | |
5f39d397 | 5448 | |
5d4f98a2 YZ |
5449 | if (refs > 0) { |
5450 | if (extent_op) | |
5451 | __run_delayed_extent_op(extent_op, leaf, ei); | |
5452 | /* | |
5453 | * In the case of inline back ref, reference count will | |
5454 | * be updated by remove_extent_backref | |
952fccac | 5455 | */ |
5d4f98a2 YZ |
5456 | if (iref) { |
5457 | BUG_ON(!found_extent); | |
5458 | } else { | |
5459 | btrfs_set_extent_refs(leaf, ei, refs); | |
5460 | btrfs_mark_buffer_dirty(leaf); | |
5461 | } | |
5462 | if (found_extent) { | |
5463 | ret = remove_extent_backref(trans, extent_root, path, | |
5464 | iref, refs_to_drop, | |
5465 | is_data); | |
005d6427 DS |
5466 | if (ret) { |
5467 | btrfs_abort_transaction(trans, extent_root, ret); | |
5468 | goto out; | |
5469 | } | |
952fccac | 5470 | } |
5d4f98a2 | 5471 | } else { |
5d4f98a2 YZ |
5472 | if (found_extent) { |
5473 | BUG_ON(is_data && refs_to_drop != | |
5474 | extent_data_ref_count(root, path, iref)); | |
5475 | if (iref) { | |
5476 | BUG_ON(path->slots[0] != extent_slot); | |
5477 | } else { | |
5478 | BUG_ON(path->slots[0] != extent_slot + 1); | |
5479 | path->slots[0] = extent_slot; | |
5480 | num_to_del = 2; | |
5481 | } | |
78fae27e | 5482 | } |
b9473439 | 5483 | |
952fccac CM |
5484 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
5485 | num_to_del); | |
005d6427 DS |
5486 | if (ret) { |
5487 | btrfs_abort_transaction(trans, extent_root, ret); | |
5488 | goto out; | |
5489 | } | |
b3b4aa74 | 5490 | btrfs_release_path(path); |
21af804c | 5491 | |
5d4f98a2 | 5492 | if (is_data) { |
459931ec | 5493 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
005d6427 DS |
5494 | if (ret) { |
5495 | btrfs_abort_transaction(trans, extent_root, ret); | |
5496 | goto out; | |
5497 | } | |
459931ec CM |
5498 | } |
5499 | ||
c53d613e | 5500 | ret = update_block_group(root, bytenr, num_bytes, 0); |
005d6427 DS |
5501 | if (ret) { |
5502 | btrfs_abort_transaction(trans, extent_root, ret); | |
5503 | goto out; | |
5504 | } | |
a28ec197 | 5505 | } |
79787eaa | 5506 | out: |
5caf2a00 | 5507 | btrfs_free_path(path); |
a28ec197 CM |
5508 | return ret; |
5509 | } | |
5510 | ||
1887be66 | 5511 | /* |
f0486c68 | 5512 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
5513 | * delayed ref for that extent as well. This searches the delayed ref tree for |
5514 | * a given extent, and if there are no other delayed refs to be processed, it | |
5515 | * removes it from the tree. | |
5516 | */ | |
5517 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
5518 | struct btrfs_root *root, u64 bytenr) | |
5519 | { | |
5520 | struct btrfs_delayed_ref_head *head; | |
5521 | struct btrfs_delayed_ref_root *delayed_refs; | |
5522 | struct btrfs_delayed_ref_node *ref; | |
5523 | struct rb_node *node; | |
f0486c68 | 5524 | int ret = 0; |
1887be66 CM |
5525 | |
5526 | delayed_refs = &trans->transaction->delayed_refs; | |
5527 | spin_lock(&delayed_refs->lock); | |
5528 | head = btrfs_find_delayed_ref_head(trans, bytenr); | |
5529 | if (!head) | |
5530 | goto out; | |
5531 | ||
5532 | node = rb_prev(&head->node.rb_node); | |
5533 | if (!node) | |
5534 | goto out; | |
5535 | ||
5536 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
5537 | ||
5538 | /* there are still entries for this ref, we can't drop it */ | |
5539 | if (ref->bytenr == bytenr) | |
5540 | goto out; | |
5541 | ||
5d4f98a2 YZ |
5542 | if (head->extent_op) { |
5543 | if (!head->must_insert_reserved) | |
5544 | goto out; | |
78a6184a | 5545 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
5546 | head->extent_op = NULL; |
5547 | } | |
5548 | ||
1887be66 CM |
5549 | /* |
5550 | * waiting for the lock here would deadlock. If someone else has it | |
5551 | * locked they are already in the process of dropping it anyway | |
5552 | */ | |
5553 | if (!mutex_trylock(&head->mutex)) | |
5554 | goto out; | |
5555 | ||
5556 | /* | |
5557 | * at this point we have a head with no other entries. Go | |
5558 | * ahead and process it. | |
5559 | */ | |
5560 | head->node.in_tree = 0; | |
5561 | rb_erase(&head->node.rb_node, &delayed_refs->root); | |
c3e69d58 | 5562 | |
1887be66 CM |
5563 | delayed_refs->num_entries--; |
5564 | ||
5565 | /* | |
5566 | * we don't take a ref on the node because we're removing it from the | |
5567 | * tree, so we just steal the ref the tree was holding. | |
5568 | */ | |
c3e69d58 CM |
5569 | delayed_refs->num_heads--; |
5570 | if (list_empty(&head->cluster)) | |
5571 | delayed_refs->num_heads_ready--; | |
5572 | ||
5573 | list_del_init(&head->cluster); | |
1887be66 CM |
5574 | spin_unlock(&delayed_refs->lock); |
5575 | ||
f0486c68 YZ |
5576 | BUG_ON(head->extent_op); |
5577 | if (head->must_insert_reserved) | |
5578 | ret = 1; | |
5579 | ||
5580 | mutex_unlock(&head->mutex); | |
1887be66 | 5581 | btrfs_put_delayed_ref(&head->node); |
f0486c68 | 5582 | return ret; |
1887be66 CM |
5583 | out: |
5584 | spin_unlock(&delayed_refs->lock); | |
5585 | return 0; | |
5586 | } | |
5587 | ||
f0486c68 YZ |
5588 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
5589 | struct btrfs_root *root, | |
5590 | struct extent_buffer *buf, | |
5581a51a | 5591 | u64 parent, int last_ref) |
f0486c68 | 5592 | { |
f0486c68 YZ |
5593 | struct btrfs_block_group_cache *cache = NULL; |
5594 | int ret; | |
5595 | ||
5596 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
66d7e7f0 AJ |
5597 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
5598 | buf->start, buf->len, | |
5599 | parent, root->root_key.objectid, | |
5600 | btrfs_header_level(buf), | |
5581a51a | 5601 | BTRFS_DROP_DELAYED_REF, NULL, 0); |
79787eaa | 5602 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 YZ |
5603 | } |
5604 | ||
5605 | if (!last_ref) | |
5606 | return; | |
5607 | ||
f0486c68 | 5608 | cache = btrfs_lookup_block_group(root->fs_info, buf->start); |
f0486c68 YZ |
5609 | |
5610 | if (btrfs_header_generation(buf) == trans->transid) { | |
5611 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
5612 | ret = check_ref_cleanup(trans, root, buf->start); | |
5613 | if (!ret) | |
37be25bc | 5614 | goto out; |
f0486c68 YZ |
5615 | } |
5616 | ||
5617 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
5618 | pin_down_extent(root, cache, buf->start, buf->len, 1); | |
37be25bc | 5619 | goto out; |
f0486c68 YZ |
5620 | } |
5621 | ||
5622 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
5623 | ||
5624 | btrfs_add_free_space(cache, buf->start, buf->len); | |
fb25e914 | 5625 | btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE); |
f0486c68 YZ |
5626 | } |
5627 | out: | |
a826d6dc JB |
5628 | /* |
5629 | * Deleting the buffer, clear the corrupt flag since it doesn't matter | |
5630 | * anymore. | |
5631 | */ | |
5632 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
f0486c68 YZ |
5633 | btrfs_put_block_group(cache); |
5634 | } | |
5635 | ||
79787eaa | 5636 | /* Can return -ENOMEM */ |
66d7e7f0 AJ |
5637 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5638 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, | |
5639 | u64 owner, u64 offset, int for_cow) | |
925baedd CM |
5640 | { |
5641 | int ret; | |
66d7e7f0 | 5642 | struct btrfs_fs_info *fs_info = root->fs_info; |
925baedd | 5643 | |
56bec294 CM |
5644 | /* |
5645 | * tree log blocks never actually go into the extent allocation | |
5646 | * tree, just update pinning info and exit early. | |
56bec294 | 5647 | */ |
5d4f98a2 YZ |
5648 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
5649 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 5650 | /* unlocks the pinned mutex */ |
11833d66 | 5651 | btrfs_pin_extent(root, bytenr, num_bytes, 1); |
56bec294 | 5652 | ret = 0; |
5d4f98a2 | 5653 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 AJ |
5654 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
5655 | num_bytes, | |
5d4f98a2 | 5656 | parent, root_objectid, (int)owner, |
66d7e7f0 | 5657 | BTRFS_DROP_DELAYED_REF, NULL, for_cow); |
5d4f98a2 | 5658 | } else { |
66d7e7f0 AJ |
5659 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
5660 | num_bytes, | |
5661 | parent, root_objectid, owner, | |
5662 | offset, BTRFS_DROP_DELAYED_REF, | |
5663 | NULL, for_cow); | |
56bec294 | 5664 | } |
925baedd CM |
5665 | return ret; |
5666 | } | |
5667 | ||
53b381b3 DW |
5668 | static u64 stripe_align(struct btrfs_root *root, |
5669 | struct btrfs_block_group_cache *cache, | |
5670 | u64 val, u64 num_bytes) | |
87ee04eb | 5671 | { |
fda2832f | 5672 | u64 ret = ALIGN(val, root->stripesize); |
87ee04eb CM |
5673 | return ret; |
5674 | } | |
5675 | ||
817d52f8 JB |
5676 | /* |
5677 | * when we wait for progress in the block group caching, its because | |
5678 | * our allocation attempt failed at least once. So, we must sleep | |
5679 | * and let some progress happen before we try again. | |
5680 | * | |
5681 | * This function will sleep at least once waiting for new free space to | |
5682 | * show up, and then it will check the block group free space numbers | |
5683 | * for our min num_bytes. Another option is to have it go ahead | |
5684 | * and look in the rbtree for a free extent of a given size, but this | |
5685 | * is a good start. | |
5686 | */ | |
5687 | static noinline int | |
5688 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, | |
5689 | u64 num_bytes) | |
5690 | { | |
11833d66 | 5691 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 5692 | |
11833d66 YZ |
5693 | caching_ctl = get_caching_control(cache); |
5694 | if (!caching_ctl) | |
817d52f8 | 5695 | return 0; |
817d52f8 | 5696 | |
11833d66 | 5697 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 5698 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
5699 | |
5700 | put_caching_control(caching_ctl); | |
5701 | return 0; | |
5702 | } | |
5703 | ||
5704 | static noinline int | |
5705 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
5706 | { | |
5707 | struct btrfs_caching_control *caching_ctl; | |
11833d66 YZ |
5708 | |
5709 | caching_ctl = get_caching_control(cache); | |
5710 | if (!caching_ctl) | |
5711 | return 0; | |
5712 | ||
5713 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
5714 | ||
5715 | put_caching_control(caching_ctl); | |
817d52f8 JB |
5716 | return 0; |
5717 | } | |
5718 | ||
31e50229 | 5719 | int __get_raid_index(u64 flags) |
b742bb82 | 5720 | { |
7738a53a | 5721 | if (flags & BTRFS_BLOCK_GROUP_RAID10) |
e6ec716f | 5722 | return BTRFS_RAID_RAID10; |
7738a53a | 5723 | else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
e6ec716f | 5724 | return BTRFS_RAID_RAID1; |
7738a53a | 5725 | else if (flags & BTRFS_BLOCK_GROUP_DUP) |
e6ec716f | 5726 | return BTRFS_RAID_DUP; |
7738a53a | 5727 | else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
e6ec716f | 5728 | return BTRFS_RAID_RAID0; |
53b381b3 | 5729 | else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
e942f883 | 5730 | return BTRFS_RAID_RAID5; |
53b381b3 | 5731 | else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
e942f883 | 5732 | return BTRFS_RAID_RAID6; |
7738a53a | 5733 | |
e942f883 | 5734 | return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
b742bb82 YZ |
5735 | } |
5736 | ||
7738a53a ID |
5737 | static int get_block_group_index(struct btrfs_block_group_cache *cache) |
5738 | { | |
31e50229 | 5739 | return __get_raid_index(cache->flags); |
7738a53a ID |
5740 | } |
5741 | ||
817d52f8 | 5742 | enum btrfs_loop_type { |
285ff5af JB |
5743 | LOOP_CACHING_NOWAIT = 0, |
5744 | LOOP_CACHING_WAIT = 1, | |
5745 | LOOP_ALLOC_CHUNK = 2, | |
5746 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
5747 | }; |
5748 | ||
fec577fb CM |
5749 | /* |
5750 | * walks the btree of allocated extents and find a hole of a given size. | |
5751 | * The key ins is changed to record the hole: | |
5752 | * ins->objectid == block start | |
62e2749e | 5753 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
5754 | * ins->offset == number of blocks |
5755 | * Any available blocks before search_start are skipped. | |
5756 | */ | |
d397712b | 5757 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
98ed5174 CM |
5758 | struct btrfs_root *orig_root, |
5759 | u64 num_bytes, u64 empty_size, | |
98ed5174 | 5760 | u64 hint_byte, struct btrfs_key *ins, |
e0f54067 | 5761 | u64 data) |
fec577fb | 5762 | { |
80eb234a | 5763 | int ret = 0; |
d397712b | 5764 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
fa9c0d79 | 5765 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 5766 | struct btrfs_block_group_cache *block_group = NULL; |
274bd4fb | 5767 | struct btrfs_block_group_cache *used_block_group; |
81c9ad23 | 5768 | u64 search_start = 0; |
239b14b3 | 5769 | int empty_cluster = 2 * 1024 * 1024; |
80eb234a | 5770 | struct btrfs_space_info *space_info; |
fa9c0d79 | 5771 | int loop = 0; |
ac5c9300 | 5772 | int index = __get_raid_index(data); |
fb25e914 JB |
5773 | int alloc_type = (data & BTRFS_BLOCK_GROUP_DATA) ? |
5774 | RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC; | |
817d52f8 | 5775 | bool found_uncached_bg = false; |
0a24325e | 5776 | bool failed_cluster_refill = false; |
1cdda9b8 | 5777 | bool failed_alloc = false; |
67377734 | 5778 | bool use_cluster = true; |
60d2adbb | 5779 | bool have_caching_bg = false; |
fec577fb | 5780 | |
db94535d | 5781 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 | 5782 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
80eb234a JB |
5783 | ins->objectid = 0; |
5784 | ins->offset = 0; | |
b1a4d965 | 5785 | |
3f7de037 JB |
5786 | trace_find_free_extent(orig_root, num_bytes, empty_size, data); |
5787 | ||
2552d17e | 5788 | space_info = __find_space_info(root->fs_info, data); |
1b1d1f66 | 5789 | if (!space_info) { |
e0f54067 | 5790 | printk(KERN_ERR "No space info for %llu\n", data); |
1b1d1f66 JB |
5791 | return -ENOSPC; |
5792 | } | |
2552d17e | 5793 | |
67377734 JB |
5794 | /* |
5795 | * If the space info is for both data and metadata it means we have a | |
5796 | * small filesystem and we can't use the clustering stuff. | |
5797 | */ | |
5798 | if (btrfs_mixed_space_info(space_info)) | |
5799 | use_cluster = false; | |
5800 | ||
67377734 | 5801 | if (data & BTRFS_BLOCK_GROUP_METADATA && use_cluster) { |
fa9c0d79 | 5802 | last_ptr = &root->fs_info->meta_alloc_cluster; |
536ac8ae CM |
5803 | if (!btrfs_test_opt(root, SSD)) |
5804 | empty_cluster = 64 * 1024; | |
239b14b3 CM |
5805 | } |
5806 | ||
67377734 JB |
5807 | if ((data & BTRFS_BLOCK_GROUP_DATA) && use_cluster && |
5808 | btrfs_test_opt(root, SSD)) { | |
fa9c0d79 CM |
5809 | last_ptr = &root->fs_info->data_alloc_cluster; |
5810 | } | |
0f9dd46c | 5811 | |
239b14b3 | 5812 | if (last_ptr) { |
fa9c0d79 CM |
5813 | spin_lock(&last_ptr->lock); |
5814 | if (last_ptr->block_group) | |
5815 | hint_byte = last_ptr->window_start; | |
5816 | spin_unlock(&last_ptr->lock); | |
239b14b3 | 5817 | } |
fa9c0d79 | 5818 | |
a061fc8d | 5819 | search_start = max(search_start, first_logical_byte(root, 0)); |
239b14b3 | 5820 | search_start = max(search_start, hint_byte); |
0b86a832 | 5821 | |
817d52f8 | 5822 | if (!last_ptr) |
fa9c0d79 | 5823 | empty_cluster = 0; |
fa9c0d79 | 5824 | |
2552d17e | 5825 | if (search_start == hint_byte) { |
2552d17e JB |
5826 | block_group = btrfs_lookup_block_group(root->fs_info, |
5827 | search_start); | |
274bd4fb | 5828 | used_block_group = block_group; |
817d52f8 JB |
5829 | /* |
5830 | * we don't want to use the block group if it doesn't match our | |
5831 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
5832 | * |
5833 | * However if we are re-searching with an ideal block group | |
5834 | * picked out then we don't care that the block group is cached. | |
817d52f8 JB |
5835 | */ |
5836 | if (block_group && block_group_bits(block_group, data) && | |
285ff5af | 5837 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 5838 | down_read(&space_info->groups_sem); |
44fb5511 CM |
5839 | if (list_empty(&block_group->list) || |
5840 | block_group->ro) { | |
5841 | /* | |
5842 | * someone is removing this block group, | |
5843 | * we can't jump into the have_block_group | |
5844 | * target because our list pointers are not | |
5845 | * valid | |
5846 | */ | |
5847 | btrfs_put_block_group(block_group); | |
5848 | up_read(&space_info->groups_sem); | |
ccf0e725 | 5849 | } else { |
b742bb82 | 5850 | index = get_block_group_index(block_group); |
44fb5511 | 5851 | goto have_block_group; |
ccf0e725 | 5852 | } |
2552d17e | 5853 | } else if (block_group) { |
fa9c0d79 | 5854 | btrfs_put_block_group(block_group); |
2552d17e | 5855 | } |
42e70e7a | 5856 | } |
2552d17e | 5857 | search: |
60d2adbb | 5858 | have_caching_bg = false; |
80eb234a | 5859 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
5860 | list_for_each_entry(block_group, &space_info->block_groups[index], |
5861 | list) { | |
6226cb0a | 5862 | u64 offset; |
817d52f8 | 5863 | int cached; |
8a1413a2 | 5864 | |
274bd4fb | 5865 | used_block_group = block_group; |
11dfe35a | 5866 | btrfs_get_block_group(block_group); |
2552d17e | 5867 | search_start = block_group->key.objectid; |
42e70e7a | 5868 | |
83a50de9 CM |
5869 | /* |
5870 | * this can happen if we end up cycling through all the | |
5871 | * raid types, but we want to make sure we only allocate | |
5872 | * for the proper type. | |
5873 | */ | |
5874 | if (!block_group_bits(block_group, data)) { | |
5875 | u64 extra = BTRFS_BLOCK_GROUP_DUP | | |
5876 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
5877 | BTRFS_BLOCK_GROUP_RAID5 | |
5878 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
5879 | BTRFS_BLOCK_GROUP_RAID10; |
5880 | ||
5881 | /* | |
5882 | * if they asked for extra copies and this block group | |
5883 | * doesn't provide them, bail. This does allow us to | |
5884 | * fill raid0 from raid1. | |
5885 | */ | |
5886 | if ((data & extra) && !(block_group->flags & extra)) | |
5887 | goto loop; | |
5888 | } | |
5889 | ||
2552d17e | 5890 | have_block_group: |
291c7d2f JB |
5891 | cached = block_group_cache_done(block_group); |
5892 | if (unlikely(!cached)) { | |
291c7d2f | 5893 | found_uncached_bg = true; |
f6373bf3 | 5894 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
5895 | BUG_ON(ret < 0); |
5896 | ret = 0; | |
817d52f8 JB |
5897 | } |
5898 | ||
ea6a478e | 5899 | if (unlikely(block_group->ro)) |
2552d17e | 5900 | goto loop; |
0f9dd46c | 5901 | |
0a24325e | 5902 | /* |
062c05c4 AO |
5903 | * Ok we want to try and use the cluster allocator, so |
5904 | * lets look there | |
0a24325e | 5905 | */ |
062c05c4 | 5906 | if (last_ptr) { |
8de972b4 | 5907 | unsigned long aligned_cluster; |
fa9c0d79 CM |
5908 | /* |
5909 | * the refill lock keeps out other | |
5910 | * people trying to start a new cluster | |
5911 | */ | |
5912 | spin_lock(&last_ptr->refill_lock); | |
274bd4fb AO |
5913 | used_block_group = last_ptr->block_group; |
5914 | if (used_block_group != block_group && | |
5915 | (!used_block_group || | |
5916 | used_block_group->ro || | |
5917 | !block_group_bits(used_block_group, data))) { | |
5918 | used_block_group = block_group; | |
44fb5511 | 5919 | goto refill_cluster; |
274bd4fb AO |
5920 | } |
5921 | ||
5922 | if (used_block_group != block_group) | |
5923 | btrfs_get_block_group(used_block_group); | |
44fb5511 | 5924 | |
274bd4fb AO |
5925 | offset = btrfs_alloc_from_cluster(used_block_group, |
5926 | last_ptr, num_bytes, used_block_group->key.objectid); | |
fa9c0d79 CM |
5927 | if (offset) { |
5928 | /* we have a block, we're done */ | |
5929 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
5930 | trace_btrfs_reserve_extent_cluster(root, |
5931 | block_group, search_start, num_bytes); | |
fa9c0d79 CM |
5932 | goto checks; |
5933 | } | |
5934 | ||
274bd4fb AO |
5935 | WARN_ON(last_ptr->block_group != used_block_group); |
5936 | if (used_block_group != block_group) { | |
5937 | btrfs_put_block_group(used_block_group); | |
5938 | used_block_group = block_group; | |
fa9c0d79 | 5939 | } |
44fb5511 | 5940 | refill_cluster: |
274bd4fb | 5941 | BUG_ON(used_block_group != block_group); |
062c05c4 AO |
5942 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
5943 | * set up a new clusters, so lets just skip it | |
5944 | * and let the allocator find whatever block | |
5945 | * it can find. If we reach this point, we | |
5946 | * will have tried the cluster allocator | |
5947 | * plenty of times and not have found | |
5948 | * anything, so we are likely way too | |
5949 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
5950 | * anything. |
5951 | * | |
5952 | * However, if the cluster is taken from the | |
5953 | * current block group, release the cluster | |
5954 | * first, so that we stand a better chance of | |
5955 | * succeeding in the unclustered | |
5956 | * allocation. */ | |
5957 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
5958 | last_ptr->block_group != block_group) { | |
062c05c4 AO |
5959 | spin_unlock(&last_ptr->refill_lock); |
5960 | goto unclustered_alloc; | |
5961 | } | |
5962 | ||
fa9c0d79 CM |
5963 | /* |
5964 | * this cluster didn't work out, free it and | |
5965 | * start over | |
5966 | */ | |
5967 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
5968 | ||
a5f6f719 AO |
5969 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
5970 | spin_unlock(&last_ptr->refill_lock); | |
5971 | goto unclustered_alloc; | |
5972 | } | |
5973 | ||
8de972b4 CM |
5974 | aligned_cluster = max_t(unsigned long, |
5975 | empty_cluster + empty_size, | |
5976 | block_group->full_stripe_len); | |
5977 | ||
fa9c0d79 | 5978 | /* allocate a cluster in this block group */ |
451d7585 | 5979 | ret = btrfs_find_space_cluster(trans, root, |
fa9c0d79 | 5980 | block_group, last_ptr, |
1b22bad7 | 5981 | search_start, num_bytes, |
8de972b4 | 5982 | aligned_cluster); |
fa9c0d79 CM |
5983 | if (ret == 0) { |
5984 | /* | |
5985 | * now pull our allocation out of this | |
5986 | * cluster | |
5987 | */ | |
5988 | offset = btrfs_alloc_from_cluster(block_group, | |
5989 | last_ptr, num_bytes, | |
5990 | search_start); | |
5991 | if (offset) { | |
5992 | /* we found one, proceed */ | |
5993 | spin_unlock(&last_ptr->refill_lock); | |
3f7de037 JB |
5994 | trace_btrfs_reserve_extent_cluster(root, |
5995 | block_group, search_start, | |
5996 | num_bytes); | |
fa9c0d79 CM |
5997 | goto checks; |
5998 | } | |
0a24325e JB |
5999 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
6000 | && !failed_cluster_refill) { | |
817d52f8 JB |
6001 | spin_unlock(&last_ptr->refill_lock); |
6002 | ||
0a24325e | 6003 | failed_cluster_refill = true; |
817d52f8 JB |
6004 | wait_block_group_cache_progress(block_group, |
6005 | num_bytes + empty_cluster + empty_size); | |
6006 | goto have_block_group; | |
fa9c0d79 | 6007 | } |
817d52f8 | 6008 | |
fa9c0d79 CM |
6009 | /* |
6010 | * at this point we either didn't find a cluster | |
6011 | * or we weren't able to allocate a block from our | |
6012 | * cluster. Free the cluster we've been trying | |
6013 | * to use, and go to the next block group | |
6014 | */ | |
0a24325e | 6015 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 6016 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 6017 | goto loop; |
fa9c0d79 CM |
6018 | } |
6019 | ||
062c05c4 | 6020 | unclustered_alloc: |
a5f6f719 AO |
6021 | spin_lock(&block_group->free_space_ctl->tree_lock); |
6022 | if (cached && | |
6023 | block_group->free_space_ctl->free_space < | |
6024 | num_bytes + empty_cluster + empty_size) { | |
6025 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6026 | goto loop; | |
6027 | } | |
6028 | spin_unlock(&block_group->free_space_ctl->tree_lock); | |
6029 | ||
6226cb0a JB |
6030 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
6031 | num_bytes, empty_size); | |
1cdda9b8 JB |
6032 | /* |
6033 | * If we didn't find a chunk, and we haven't failed on this | |
6034 | * block group before, and this block group is in the middle of | |
6035 | * caching and we are ok with waiting, then go ahead and wait | |
6036 | * for progress to be made, and set failed_alloc to true. | |
6037 | * | |
6038 | * If failed_alloc is true then we've already waited on this | |
6039 | * block group once and should move on to the next block group. | |
6040 | */ | |
6041 | if (!offset && !failed_alloc && !cached && | |
6042 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 6043 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
6044 | num_bytes + empty_size); |
6045 | failed_alloc = true; | |
817d52f8 | 6046 | goto have_block_group; |
1cdda9b8 | 6047 | } else if (!offset) { |
60d2adbb MX |
6048 | if (!cached) |
6049 | have_caching_bg = true; | |
1cdda9b8 | 6050 | goto loop; |
817d52f8 | 6051 | } |
fa9c0d79 | 6052 | checks: |
53b381b3 DW |
6053 | search_start = stripe_align(root, used_block_group, |
6054 | offset, num_bytes); | |
25179201 | 6055 | |
2552d17e JB |
6056 | /* move on to the next group */ |
6057 | if (search_start + num_bytes > | |
274bd4fb AO |
6058 | used_block_group->key.objectid + used_block_group->key.offset) { |
6059 | btrfs_add_free_space(used_block_group, offset, num_bytes); | |
2552d17e | 6060 | goto loop; |
6226cb0a | 6061 | } |
f5a31e16 | 6062 | |
f0486c68 | 6063 | if (offset < search_start) |
274bd4fb | 6064 | btrfs_add_free_space(used_block_group, offset, |
f0486c68 YZ |
6065 | search_start - offset); |
6066 | BUG_ON(offset > search_start); | |
2552d17e | 6067 | |
274bd4fb | 6068 | ret = btrfs_update_reserved_bytes(used_block_group, num_bytes, |
fb25e914 | 6069 | alloc_type); |
f0486c68 | 6070 | if (ret == -EAGAIN) { |
274bd4fb | 6071 | btrfs_add_free_space(used_block_group, offset, num_bytes); |
2552d17e | 6072 | goto loop; |
0f9dd46c | 6073 | } |
0b86a832 | 6074 | |
f0486c68 | 6075 | /* we are all good, lets return */ |
2552d17e JB |
6076 | ins->objectid = search_start; |
6077 | ins->offset = num_bytes; | |
d2fb3437 | 6078 | |
3f7de037 JB |
6079 | trace_btrfs_reserve_extent(orig_root, block_group, |
6080 | search_start, num_bytes); | |
274bd4fb AO |
6081 | if (used_block_group != block_group) |
6082 | btrfs_put_block_group(used_block_group); | |
d82a6f1d | 6083 | btrfs_put_block_group(block_group); |
2552d17e JB |
6084 | break; |
6085 | loop: | |
0a24325e | 6086 | failed_cluster_refill = false; |
1cdda9b8 | 6087 | failed_alloc = false; |
b742bb82 | 6088 | BUG_ON(index != get_block_group_index(block_group)); |
274bd4fb AO |
6089 | if (used_block_group != block_group) |
6090 | btrfs_put_block_group(used_block_group); | |
fa9c0d79 | 6091 | btrfs_put_block_group(block_group); |
2552d17e JB |
6092 | } |
6093 | up_read(&space_info->groups_sem); | |
6094 | ||
60d2adbb MX |
6095 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
6096 | goto search; | |
6097 | ||
b742bb82 YZ |
6098 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
6099 | goto search; | |
6100 | ||
285ff5af | 6101 | /* |
ccf0e725 JB |
6102 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
6103 | * caching kthreads as we move along | |
817d52f8 JB |
6104 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
6105 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
6106 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
6107 | * again | |
fa9c0d79 | 6108 | */ |
723bda20 | 6109 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 6110 | index = 0; |
723bda20 | 6111 | loop++; |
817d52f8 | 6112 | if (loop == LOOP_ALLOC_CHUNK) { |
698d0082 | 6113 | ret = do_chunk_alloc(trans, root, data, |
ea658bad JB |
6114 | CHUNK_ALLOC_FORCE); |
6115 | /* | |
6116 | * Do not bail out on ENOSPC since we | |
6117 | * can do more things. | |
6118 | */ | |
6119 | if (ret < 0 && ret != -ENOSPC) { | |
6120 | btrfs_abort_transaction(trans, | |
6121 | root, ret); | |
6122 | goto out; | |
723bda20 | 6123 | } |
2552d17e JB |
6124 | } |
6125 | ||
723bda20 JB |
6126 | if (loop == LOOP_NO_EMPTY_SIZE) { |
6127 | empty_size = 0; | |
6128 | empty_cluster = 0; | |
fa9c0d79 | 6129 | } |
723bda20 JB |
6130 | |
6131 | goto search; | |
2552d17e JB |
6132 | } else if (!ins->objectid) { |
6133 | ret = -ENOSPC; | |
d82a6f1d | 6134 | } else if (ins->objectid) { |
80eb234a | 6135 | ret = 0; |
be744175 | 6136 | } |
79787eaa | 6137 | out: |
be744175 | 6138 | |
0f70abe2 | 6139 | return ret; |
fec577fb | 6140 | } |
ec44a35c | 6141 | |
9ed74f2d JB |
6142 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes, |
6143 | int dump_block_groups) | |
0f9dd46c JB |
6144 | { |
6145 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 6146 | int index = 0; |
0f9dd46c | 6147 | |
9ed74f2d | 6148 | spin_lock(&info->lock); |
fb25e914 JB |
6149 | printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n", |
6150 | (unsigned long long)info->flags, | |
d397712b | 6151 | (unsigned long long)(info->total_bytes - info->bytes_used - |
9ed74f2d | 6152 | info->bytes_pinned - info->bytes_reserved - |
8929ecfa | 6153 | info->bytes_readonly), |
d397712b | 6154 | (info->full) ? "" : "not "); |
8929ecfa YZ |
6155 | printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, " |
6156 | "reserved=%llu, may_use=%llu, readonly=%llu\n", | |
21380931 | 6157 | (unsigned long long)info->total_bytes, |
8929ecfa | 6158 | (unsigned long long)info->bytes_used, |
21380931 | 6159 | (unsigned long long)info->bytes_pinned, |
8929ecfa | 6160 | (unsigned long long)info->bytes_reserved, |
21380931 | 6161 | (unsigned long long)info->bytes_may_use, |
8929ecfa | 6162 | (unsigned long long)info->bytes_readonly); |
9ed74f2d JB |
6163 | spin_unlock(&info->lock); |
6164 | ||
6165 | if (!dump_block_groups) | |
6166 | return; | |
0f9dd46c | 6167 | |
80eb234a | 6168 | down_read(&info->groups_sem); |
b742bb82 YZ |
6169 | again: |
6170 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 6171 | spin_lock(&cache->lock); |
799ffc3c | 6172 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n", |
d397712b CM |
6173 | (unsigned long long)cache->key.objectid, |
6174 | (unsigned long long)cache->key.offset, | |
6175 | (unsigned long long)btrfs_block_group_used(&cache->item), | |
6176 | (unsigned long long)cache->pinned, | |
799ffc3c LB |
6177 | (unsigned long long)cache->reserved, |
6178 | cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
6179 | btrfs_dump_free_space(cache, bytes); |
6180 | spin_unlock(&cache->lock); | |
6181 | } | |
b742bb82 YZ |
6182 | if (++index < BTRFS_NR_RAID_TYPES) |
6183 | goto again; | |
80eb234a | 6184 | up_read(&info->groups_sem); |
0f9dd46c | 6185 | } |
e8569813 | 6186 | |
11833d66 YZ |
6187 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
6188 | struct btrfs_root *root, | |
6189 | u64 num_bytes, u64 min_alloc_size, | |
6190 | u64 empty_size, u64 hint_byte, | |
81c9ad23 | 6191 | struct btrfs_key *ins, u64 data) |
fec577fb | 6192 | { |
9e622d6b | 6193 | bool final_tried = false; |
fec577fb | 6194 | int ret; |
925baedd | 6195 | |
6a63209f | 6196 | data = btrfs_get_alloc_profile(root, data); |
98d20f67 | 6197 | again: |
db94535d CM |
6198 | WARN_ON(num_bytes < root->sectorsize); |
6199 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
81c9ad23 | 6200 | hint_byte, ins, data); |
3b951516 | 6201 | |
9e622d6b MX |
6202 | if (ret == -ENOSPC) { |
6203 | if (!final_tried) { | |
6204 | num_bytes = num_bytes >> 1; | |
24542bf7 | 6205 | num_bytes = round_down(num_bytes, root->sectorsize); |
9e622d6b | 6206 | num_bytes = max(num_bytes, min_alloc_size); |
9e622d6b MX |
6207 | if (num_bytes == min_alloc_size) |
6208 | final_tried = true; | |
6209 | goto again; | |
6210 | } else if (btrfs_test_opt(root, ENOSPC_DEBUG)) { | |
6211 | struct btrfs_space_info *sinfo; | |
6212 | ||
6213 | sinfo = __find_space_info(root->fs_info, data); | |
6214 | printk(KERN_ERR "btrfs allocation failed flags %llu, " | |
6215 | "wanted %llu\n", (unsigned long long)data, | |
6216 | (unsigned long long)num_bytes); | |
53804280 JM |
6217 | if (sinfo) |
6218 | dump_space_info(sinfo, num_bytes, 1); | |
9e622d6b | 6219 | } |
925baedd | 6220 | } |
0f9dd46c | 6221 | |
1abe9b8a | 6222 | trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset); |
6223 | ||
0f9dd46c | 6224 | return ret; |
e6dcd2dc CM |
6225 | } |
6226 | ||
e688b725 CM |
6227 | static int __btrfs_free_reserved_extent(struct btrfs_root *root, |
6228 | u64 start, u64 len, int pin) | |
65b51a00 | 6229 | { |
0f9dd46c | 6230 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 6231 | int ret = 0; |
0f9dd46c | 6232 | |
0f9dd46c JB |
6233 | cache = btrfs_lookup_block_group(root->fs_info, start); |
6234 | if (!cache) { | |
d397712b CM |
6235 | printk(KERN_ERR "Unable to find block group for %llu\n", |
6236 | (unsigned long long)start); | |
0f9dd46c JB |
6237 | return -ENOSPC; |
6238 | } | |
1f3c79a2 | 6239 | |
5378e607 LD |
6240 | if (btrfs_test_opt(root, DISCARD)) |
6241 | ret = btrfs_discard_extent(root, start, len, NULL); | |
1f3c79a2 | 6242 | |
e688b725 CM |
6243 | if (pin) |
6244 | pin_down_extent(root, cache, start, len, 1); | |
6245 | else { | |
6246 | btrfs_add_free_space(cache, start, len); | |
6247 | btrfs_update_reserved_bytes(cache, len, RESERVE_FREE); | |
6248 | } | |
fa9c0d79 | 6249 | btrfs_put_block_group(cache); |
817d52f8 | 6250 | |
1abe9b8a | 6251 | trace_btrfs_reserved_extent_free(root, start, len); |
6252 | ||
e6dcd2dc CM |
6253 | return ret; |
6254 | } | |
6255 | ||
e688b725 CM |
6256 | int btrfs_free_reserved_extent(struct btrfs_root *root, |
6257 | u64 start, u64 len) | |
6258 | { | |
6259 | return __btrfs_free_reserved_extent(root, start, len, 0); | |
6260 | } | |
6261 | ||
6262 | int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, | |
6263 | u64 start, u64 len) | |
6264 | { | |
6265 | return __btrfs_free_reserved_extent(root, start, len, 1); | |
6266 | } | |
6267 | ||
5d4f98a2 YZ |
6268 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
6269 | struct btrfs_root *root, | |
6270 | u64 parent, u64 root_objectid, | |
6271 | u64 flags, u64 owner, u64 offset, | |
6272 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
6273 | { |
6274 | int ret; | |
5d4f98a2 | 6275 | struct btrfs_fs_info *fs_info = root->fs_info; |
e6dcd2dc | 6276 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 6277 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 6278 | struct btrfs_path *path; |
5d4f98a2 YZ |
6279 | struct extent_buffer *leaf; |
6280 | int type; | |
6281 | u32 size; | |
26b8003f | 6282 | |
5d4f98a2 YZ |
6283 | if (parent > 0) |
6284 | type = BTRFS_SHARED_DATA_REF_KEY; | |
6285 | else | |
6286 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 6287 | |
5d4f98a2 | 6288 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
6289 | |
6290 | path = btrfs_alloc_path(); | |
db5b493a TI |
6291 | if (!path) |
6292 | return -ENOMEM; | |
47e4bb98 | 6293 | |
b9473439 | 6294 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6295 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
6296 | ins, size); | |
79787eaa JM |
6297 | if (ret) { |
6298 | btrfs_free_path(path); | |
6299 | return ret; | |
6300 | } | |
0f9dd46c | 6301 | |
5d4f98a2 YZ |
6302 | leaf = path->nodes[0]; |
6303 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 6304 | struct btrfs_extent_item); |
5d4f98a2 YZ |
6305 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
6306 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6307 | btrfs_set_extent_flags(leaf, extent_item, | |
6308 | flags | BTRFS_EXTENT_FLAG_DATA); | |
6309 | ||
6310 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
6311 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
6312 | if (parent > 0) { | |
6313 | struct btrfs_shared_data_ref *ref; | |
6314 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
6315 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6316 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
6317 | } else { | |
6318 | struct btrfs_extent_data_ref *ref; | |
6319 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
6320 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
6321 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
6322 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
6323 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
6324 | } | |
47e4bb98 CM |
6325 | |
6326 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 6327 | btrfs_free_path(path); |
f510cfec | 6328 | |
c53d613e | 6329 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6330 | if (ret) { /* -ENOENT, logic error */ |
d397712b CM |
6331 | printk(KERN_ERR "btrfs update block group failed for %llu " |
6332 | "%llu\n", (unsigned long long)ins->objectid, | |
6333 | (unsigned long long)ins->offset); | |
f5947066 CM |
6334 | BUG(); |
6335 | } | |
e6dcd2dc CM |
6336 | return ret; |
6337 | } | |
6338 | ||
5d4f98a2 YZ |
6339 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
6340 | struct btrfs_root *root, | |
6341 | u64 parent, u64 root_objectid, | |
6342 | u64 flags, struct btrfs_disk_key *key, | |
6343 | int level, struct btrfs_key *ins) | |
e6dcd2dc CM |
6344 | { |
6345 | int ret; | |
5d4f98a2 YZ |
6346 | struct btrfs_fs_info *fs_info = root->fs_info; |
6347 | struct btrfs_extent_item *extent_item; | |
6348 | struct btrfs_tree_block_info *block_info; | |
6349 | struct btrfs_extent_inline_ref *iref; | |
6350 | struct btrfs_path *path; | |
6351 | struct extent_buffer *leaf; | |
6352 | u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); | |
1c2308f8 | 6353 | |
5d4f98a2 | 6354 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6355 | if (!path) |
6356 | return -ENOMEM; | |
56bec294 | 6357 | |
5d4f98a2 YZ |
6358 | path->leave_spinning = 1; |
6359 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
6360 | ins, size); | |
79787eaa JM |
6361 | if (ret) { |
6362 | btrfs_free_path(path); | |
6363 | return ret; | |
6364 | } | |
5d4f98a2 YZ |
6365 | |
6366 | leaf = path->nodes[0]; | |
6367 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
6368 | struct btrfs_extent_item); | |
6369 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
6370 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
6371 | btrfs_set_extent_flags(leaf, extent_item, | |
6372 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
6373 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
6374 | ||
6375 | btrfs_set_tree_block_key(leaf, block_info, key); | |
6376 | btrfs_set_tree_block_level(leaf, block_info, level); | |
6377 | ||
6378 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); | |
6379 | if (parent > 0) { | |
6380 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); | |
6381 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6382 | BTRFS_SHARED_BLOCK_REF_KEY); | |
6383 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
6384 | } else { | |
6385 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
6386 | BTRFS_TREE_BLOCK_REF_KEY); | |
6387 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
6388 | } | |
6389 | ||
6390 | btrfs_mark_buffer_dirty(leaf); | |
6391 | btrfs_free_path(path); | |
6392 | ||
c53d613e | 6393 | ret = update_block_group(root, ins->objectid, ins->offset, 1); |
79787eaa | 6394 | if (ret) { /* -ENOENT, logic error */ |
5d4f98a2 YZ |
6395 | printk(KERN_ERR "btrfs update block group failed for %llu " |
6396 | "%llu\n", (unsigned long long)ins->objectid, | |
6397 | (unsigned long long)ins->offset); | |
6398 | BUG(); | |
6399 | } | |
6400 | return ret; | |
6401 | } | |
6402 | ||
6403 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
6404 | struct btrfs_root *root, | |
6405 | u64 root_objectid, u64 owner, | |
6406 | u64 offset, struct btrfs_key *ins) | |
6407 | { | |
6408 | int ret; | |
6409 | ||
6410 | BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
6411 | ||
66d7e7f0 AJ |
6412 | ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid, |
6413 | ins->offset, 0, | |
6414 | root_objectid, owner, offset, | |
6415 | BTRFS_ADD_DELAYED_EXTENT, NULL, 0); | |
e6dcd2dc CM |
6416 | return ret; |
6417 | } | |
e02119d5 CM |
6418 | |
6419 | /* | |
6420 | * this is used by the tree logging recovery code. It records that | |
6421 | * an extent has been allocated and makes sure to clear the free | |
6422 | * space cache bits as well | |
6423 | */ | |
5d4f98a2 YZ |
6424 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
6425 | struct btrfs_root *root, | |
6426 | u64 root_objectid, u64 owner, u64 offset, | |
6427 | struct btrfs_key *ins) | |
e02119d5 CM |
6428 | { |
6429 | int ret; | |
6430 | struct btrfs_block_group_cache *block_group; | |
11833d66 YZ |
6431 | struct btrfs_caching_control *caching_ctl; |
6432 | u64 start = ins->objectid; | |
6433 | u64 num_bytes = ins->offset; | |
e02119d5 | 6434 | |
e02119d5 | 6435 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
f6373bf3 | 6436 | cache_block_group(block_group, 0); |
11833d66 | 6437 | caching_ctl = get_caching_control(block_group); |
e02119d5 | 6438 | |
11833d66 YZ |
6439 | if (!caching_ctl) { |
6440 | BUG_ON(!block_group_cache_done(block_group)); | |
6441 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
79787eaa | 6442 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6443 | } else { |
6444 | mutex_lock(&caching_ctl->mutex); | |
6445 | ||
6446 | if (start >= caching_ctl->progress) { | |
6447 | ret = add_excluded_extent(root, start, num_bytes); | |
79787eaa | 6448 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6449 | } else if (start + num_bytes <= caching_ctl->progress) { |
6450 | ret = btrfs_remove_free_space(block_group, | |
6451 | start, num_bytes); | |
79787eaa | 6452 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6453 | } else { |
6454 | num_bytes = caching_ctl->progress - start; | |
6455 | ret = btrfs_remove_free_space(block_group, | |
6456 | start, num_bytes); | |
79787eaa | 6457 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6458 | |
6459 | start = caching_ctl->progress; | |
6460 | num_bytes = ins->objectid + ins->offset - | |
6461 | caching_ctl->progress; | |
6462 | ret = add_excluded_extent(root, start, num_bytes); | |
79787eaa | 6463 | BUG_ON(ret); /* -ENOMEM */ |
11833d66 YZ |
6464 | } |
6465 | ||
6466 | mutex_unlock(&caching_ctl->mutex); | |
6467 | put_caching_control(caching_ctl); | |
6468 | } | |
6469 | ||
fb25e914 JB |
6470 | ret = btrfs_update_reserved_bytes(block_group, ins->offset, |
6471 | RESERVE_ALLOC_NO_ACCOUNT); | |
79787eaa | 6472 | BUG_ON(ret); /* logic error */ |
fa9c0d79 | 6473 | btrfs_put_block_group(block_group); |
5d4f98a2 YZ |
6474 | ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, |
6475 | 0, owner, offset, ins, 1); | |
e02119d5 CM |
6476 | return ret; |
6477 | } | |
6478 | ||
65b51a00 CM |
6479 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
6480 | struct btrfs_root *root, | |
4008c04a CM |
6481 | u64 bytenr, u32 blocksize, |
6482 | int level) | |
65b51a00 CM |
6483 | { |
6484 | struct extent_buffer *buf; | |
6485 | ||
6486 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
6487 | if (!buf) | |
6488 | return ERR_PTR(-ENOMEM); | |
6489 | btrfs_set_header_generation(buf, trans->transid); | |
85d4e461 | 6490 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 CM |
6491 | btrfs_tree_lock(buf); |
6492 | clean_tree_block(trans, root, buf); | |
3083ee2e | 6493 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
6494 | |
6495 | btrfs_set_lock_blocking(buf); | |
65b51a00 | 6496 | btrfs_set_buffer_uptodate(buf); |
b4ce94de | 6497 | |
d0c803c4 | 6498 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
8cef4e16 YZ |
6499 | /* |
6500 | * we allow two log transactions at a time, use different | |
6501 | * EXENT bit to differentiate dirty pages. | |
6502 | */ | |
6503 | if (root->log_transid % 2 == 0) | |
6504 | set_extent_dirty(&root->dirty_log_pages, buf->start, | |
6505 | buf->start + buf->len - 1, GFP_NOFS); | |
6506 | else | |
6507 | set_extent_new(&root->dirty_log_pages, buf->start, | |
6508 | buf->start + buf->len - 1, GFP_NOFS); | |
d0c803c4 CM |
6509 | } else { |
6510 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
65b51a00 | 6511 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 6512 | } |
65b51a00 | 6513 | trans->blocks_used++; |
b4ce94de | 6514 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
6515 | return buf; |
6516 | } | |
6517 | ||
f0486c68 YZ |
6518 | static struct btrfs_block_rsv * |
6519 | use_block_rsv(struct btrfs_trans_handle *trans, | |
6520 | struct btrfs_root *root, u32 blocksize) | |
6521 | { | |
6522 | struct btrfs_block_rsv *block_rsv; | |
68a82277 | 6523 | struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; |
f0486c68 YZ |
6524 | int ret; |
6525 | ||
6526 | block_rsv = get_block_rsv(trans, root); | |
6527 | ||
6528 | if (block_rsv->size == 0) { | |
08e007d2 MX |
6529 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6530 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 JB |
6531 | /* |
6532 | * If we couldn't reserve metadata bytes try and use some from | |
6533 | * the global reserve. | |
6534 | */ | |
6535 | if (ret && block_rsv != global_rsv) { | |
6536 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6537 | if (!ret) | |
6538 | return global_rsv; | |
f0486c68 | 6539 | return ERR_PTR(ret); |
68a82277 | 6540 | } else if (ret) { |
f0486c68 | 6541 | return ERR_PTR(ret); |
68a82277 | 6542 | } |
f0486c68 YZ |
6543 | return block_rsv; |
6544 | } | |
6545 | ||
6546 | ret = block_rsv_use_bytes(block_rsv, blocksize); | |
6547 | if (!ret) | |
6548 | return block_rsv; | |
ca7e70f5 | 6549 | if (ret && !block_rsv->failfast) { |
b069e0c3 DS |
6550 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) { |
6551 | static DEFINE_RATELIMIT_STATE(_rs, | |
6552 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
6553 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
6554 | if (__ratelimit(&_rs)) | |
6555 | WARN(1, KERN_DEBUG | |
6556 | "btrfs: block rsv returned %d\n", ret); | |
6557 | } | |
08e007d2 MX |
6558 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, |
6559 | BTRFS_RESERVE_NO_FLUSH); | |
68a82277 | 6560 | if (!ret) { |
68a82277 JB |
6561 | return block_rsv; |
6562 | } else if (ret && block_rsv != global_rsv) { | |
6563 | ret = block_rsv_use_bytes(global_rsv, blocksize); | |
6564 | if (!ret) | |
6565 | return global_rsv; | |
6566 | } | |
6567 | } | |
f0486c68 | 6568 | |
f0486c68 YZ |
6569 | return ERR_PTR(-ENOSPC); |
6570 | } | |
6571 | ||
8c2a3ca2 JB |
6572 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
6573 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
6574 | { |
6575 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
8c2a3ca2 | 6576 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0); |
f0486c68 YZ |
6577 | } |
6578 | ||
fec577fb | 6579 | /* |
f0486c68 YZ |
6580 | * finds a free extent and does all the dirty work required for allocation |
6581 | * returns the key for the extent through ins, and a tree buffer for | |
6582 | * the first block of the extent through buf. | |
6583 | * | |
fec577fb CM |
6584 | * returns the tree buffer or NULL. |
6585 | */ | |
5f39d397 | 6586 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
6587 | struct btrfs_root *root, u32 blocksize, |
6588 | u64 parent, u64 root_objectid, | |
6589 | struct btrfs_disk_key *key, int level, | |
5581a51a | 6590 | u64 hint, u64 empty_size) |
fec577fb | 6591 | { |
e2fa7227 | 6592 | struct btrfs_key ins; |
f0486c68 | 6593 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 6594 | struct extent_buffer *buf; |
f0486c68 YZ |
6595 | u64 flags = 0; |
6596 | int ret; | |
6597 | ||
fec577fb | 6598 | |
f0486c68 YZ |
6599 | block_rsv = use_block_rsv(trans, root, blocksize); |
6600 | if (IS_ERR(block_rsv)) | |
6601 | return ERR_CAST(block_rsv); | |
6602 | ||
6603 | ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, | |
81c9ad23 | 6604 | empty_size, hint, &ins, 0); |
fec577fb | 6605 | if (ret) { |
8c2a3ca2 | 6606 | unuse_block_rsv(root->fs_info, block_rsv, blocksize); |
54aa1f4d | 6607 | return ERR_PTR(ret); |
fec577fb | 6608 | } |
55c69072 | 6609 | |
4008c04a CM |
6610 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
6611 | blocksize, level); | |
79787eaa | 6612 | BUG_ON(IS_ERR(buf)); /* -ENOMEM */ |
f0486c68 YZ |
6613 | |
6614 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
6615 | if (parent == 0) | |
6616 | parent = ins.objectid; | |
6617 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
6618 | } else | |
6619 | BUG_ON(parent > 0); | |
6620 | ||
6621 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
6622 | struct btrfs_delayed_extent_op *extent_op; | |
78a6184a | 6623 | extent_op = btrfs_alloc_delayed_extent_op(); |
79787eaa | 6624 | BUG_ON(!extent_op); /* -ENOMEM */ |
f0486c68 YZ |
6625 | if (key) |
6626 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
6627 | else | |
6628 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
6629 | extent_op->flags_to_set = flags; | |
6630 | extent_op->update_key = 1; | |
6631 | extent_op->update_flags = 1; | |
6632 | extent_op->is_data = 0; | |
6633 | ||
66d7e7f0 AJ |
6634 | ret = btrfs_add_delayed_tree_ref(root->fs_info, trans, |
6635 | ins.objectid, | |
f0486c68 YZ |
6636 | ins.offset, parent, root_objectid, |
6637 | level, BTRFS_ADD_DELAYED_EXTENT, | |
5581a51a | 6638 | extent_op, 0); |
79787eaa | 6639 | BUG_ON(ret); /* -ENOMEM */ |
f0486c68 | 6640 | } |
fec577fb CM |
6641 | return buf; |
6642 | } | |
a28ec197 | 6643 | |
2c47e605 YZ |
6644 | struct walk_control { |
6645 | u64 refs[BTRFS_MAX_LEVEL]; | |
6646 | u64 flags[BTRFS_MAX_LEVEL]; | |
6647 | struct btrfs_key update_progress; | |
6648 | int stage; | |
6649 | int level; | |
6650 | int shared_level; | |
6651 | int update_ref; | |
6652 | int keep_locks; | |
1c4850e2 YZ |
6653 | int reada_slot; |
6654 | int reada_count; | |
66d7e7f0 | 6655 | int for_reloc; |
2c47e605 YZ |
6656 | }; |
6657 | ||
6658 | #define DROP_REFERENCE 1 | |
6659 | #define UPDATE_BACKREF 2 | |
6660 | ||
1c4850e2 YZ |
6661 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
6662 | struct btrfs_root *root, | |
6663 | struct walk_control *wc, | |
6664 | struct btrfs_path *path) | |
6407bf6d | 6665 | { |
1c4850e2 YZ |
6666 | u64 bytenr; |
6667 | u64 generation; | |
6668 | u64 refs; | |
94fcca9f | 6669 | u64 flags; |
5d4f98a2 | 6670 | u32 nritems; |
1c4850e2 YZ |
6671 | u32 blocksize; |
6672 | struct btrfs_key key; | |
6673 | struct extent_buffer *eb; | |
6407bf6d | 6674 | int ret; |
1c4850e2 YZ |
6675 | int slot; |
6676 | int nread = 0; | |
6407bf6d | 6677 | |
1c4850e2 YZ |
6678 | if (path->slots[wc->level] < wc->reada_slot) { |
6679 | wc->reada_count = wc->reada_count * 2 / 3; | |
6680 | wc->reada_count = max(wc->reada_count, 2); | |
6681 | } else { | |
6682 | wc->reada_count = wc->reada_count * 3 / 2; | |
6683 | wc->reada_count = min_t(int, wc->reada_count, | |
6684 | BTRFS_NODEPTRS_PER_BLOCK(root)); | |
6685 | } | |
7bb86316 | 6686 | |
1c4850e2 YZ |
6687 | eb = path->nodes[wc->level]; |
6688 | nritems = btrfs_header_nritems(eb); | |
6689 | blocksize = btrfs_level_size(root, wc->level - 1); | |
bd56b302 | 6690 | |
1c4850e2 YZ |
6691 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
6692 | if (nread >= wc->reada_count) | |
6693 | break; | |
bd56b302 | 6694 | |
2dd3e67b | 6695 | cond_resched(); |
1c4850e2 YZ |
6696 | bytenr = btrfs_node_blockptr(eb, slot); |
6697 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 6698 | |
1c4850e2 YZ |
6699 | if (slot == path->slots[wc->level]) |
6700 | goto reada; | |
5d4f98a2 | 6701 | |
1c4850e2 YZ |
6702 | if (wc->stage == UPDATE_BACKREF && |
6703 | generation <= root->root_key.offset) | |
bd56b302 CM |
6704 | continue; |
6705 | ||
94fcca9f YZ |
6706 | /* We don't lock the tree block, it's OK to be racy here */ |
6707 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, | |
6708 | &refs, &flags); | |
79787eaa JM |
6709 | /* We don't care about errors in readahead. */ |
6710 | if (ret < 0) | |
6711 | continue; | |
94fcca9f YZ |
6712 | BUG_ON(refs == 0); |
6713 | ||
1c4850e2 | 6714 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
6715 | if (refs == 1) |
6716 | goto reada; | |
bd56b302 | 6717 | |
94fcca9f YZ |
6718 | if (wc->level == 1 && |
6719 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6720 | continue; | |
1c4850e2 YZ |
6721 | if (!wc->update_ref || |
6722 | generation <= root->root_key.offset) | |
6723 | continue; | |
6724 | btrfs_node_key_to_cpu(eb, &key, slot); | |
6725 | ret = btrfs_comp_cpu_keys(&key, | |
6726 | &wc->update_progress); | |
6727 | if (ret < 0) | |
6728 | continue; | |
94fcca9f YZ |
6729 | } else { |
6730 | if (wc->level == 1 && | |
6731 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6732 | continue; | |
6407bf6d | 6733 | } |
1c4850e2 YZ |
6734 | reada: |
6735 | ret = readahead_tree_block(root, bytenr, blocksize, | |
6736 | generation); | |
6737 | if (ret) | |
bd56b302 | 6738 | break; |
1c4850e2 | 6739 | nread++; |
20524f02 | 6740 | } |
1c4850e2 | 6741 | wc->reada_slot = slot; |
20524f02 | 6742 | } |
2c47e605 | 6743 | |
f82d02d9 | 6744 | /* |
2c016dc2 | 6745 | * helper to process tree block while walking down the tree. |
2c47e605 | 6746 | * |
2c47e605 YZ |
6747 | * when wc->stage == UPDATE_BACKREF, this function updates |
6748 | * back refs for pointers in the block. | |
6749 | * | |
6750 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 6751 | */ |
2c47e605 | 6752 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 6753 | struct btrfs_root *root, |
2c47e605 | 6754 | struct btrfs_path *path, |
94fcca9f | 6755 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 6756 | { |
2c47e605 YZ |
6757 | int level = wc->level; |
6758 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 6759 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
6760 | int ret; |
6761 | ||
2c47e605 YZ |
6762 | if (wc->stage == UPDATE_BACKREF && |
6763 | btrfs_header_owner(eb) != root->root_key.objectid) | |
6764 | return 1; | |
f82d02d9 | 6765 | |
2c47e605 YZ |
6766 | /* |
6767 | * when reference count of tree block is 1, it won't increase | |
6768 | * again. once full backref flag is set, we never clear it. | |
6769 | */ | |
94fcca9f YZ |
6770 | if (lookup_info && |
6771 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
6772 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 YZ |
6773 | BUG_ON(!path->locks[level]); |
6774 | ret = btrfs_lookup_extent_info(trans, root, | |
6775 | eb->start, eb->len, | |
6776 | &wc->refs[level], | |
6777 | &wc->flags[level]); | |
79787eaa JM |
6778 | BUG_ON(ret == -ENOMEM); |
6779 | if (ret) | |
6780 | return ret; | |
2c47e605 YZ |
6781 | BUG_ON(wc->refs[level] == 0); |
6782 | } | |
5d4f98a2 | 6783 | |
2c47e605 YZ |
6784 | if (wc->stage == DROP_REFERENCE) { |
6785 | if (wc->refs[level] > 1) | |
6786 | return 1; | |
f82d02d9 | 6787 | |
2c47e605 | 6788 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 6789 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6790 | path->locks[level] = 0; |
6791 | } | |
6792 | return 0; | |
6793 | } | |
f82d02d9 | 6794 | |
2c47e605 YZ |
6795 | /* wc->stage == UPDATE_BACKREF */ |
6796 | if (!(wc->flags[level] & flag)) { | |
6797 | BUG_ON(!path->locks[level]); | |
66d7e7f0 | 6798 | ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc); |
79787eaa | 6799 | BUG_ON(ret); /* -ENOMEM */ |
66d7e7f0 | 6800 | ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc); |
79787eaa | 6801 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6802 | ret = btrfs_set_disk_extent_flags(trans, root, eb->start, |
6803 | eb->len, flag, 0); | |
79787eaa | 6804 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
6805 | wc->flags[level] |= flag; |
6806 | } | |
6807 | ||
6808 | /* | |
6809 | * the block is shared by multiple trees, so it's not good to | |
6810 | * keep the tree lock | |
6811 | */ | |
6812 | if (path->locks[level] && level > 0) { | |
bd681513 | 6813 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
6814 | path->locks[level] = 0; |
6815 | } | |
6816 | return 0; | |
6817 | } | |
6818 | ||
1c4850e2 | 6819 | /* |
2c016dc2 | 6820 | * helper to process tree block pointer. |
1c4850e2 YZ |
6821 | * |
6822 | * when wc->stage == DROP_REFERENCE, this function checks | |
6823 | * reference count of the block pointed to. if the block | |
6824 | * is shared and we need update back refs for the subtree | |
6825 | * rooted at the block, this function changes wc->stage to | |
6826 | * UPDATE_BACKREF. if the block is shared and there is no | |
6827 | * need to update back, this function drops the reference | |
6828 | * to the block. | |
6829 | * | |
6830 | * NOTE: return value 1 means we should stop walking down. | |
6831 | */ | |
6832 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
6833 | struct btrfs_root *root, | |
6834 | struct btrfs_path *path, | |
94fcca9f | 6835 | struct walk_control *wc, int *lookup_info) |
1c4850e2 YZ |
6836 | { |
6837 | u64 bytenr; | |
6838 | u64 generation; | |
6839 | u64 parent; | |
6840 | u32 blocksize; | |
6841 | struct btrfs_key key; | |
6842 | struct extent_buffer *next; | |
6843 | int level = wc->level; | |
6844 | int reada = 0; | |
6845 | int ret = 0; | |
6846 | ||
6847 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
6848 | path->slots[level]); | |
6849 | /* | |
6850 | * if the lower level block was created before the snapshot | |
6851 | * was created, we know there is no need to update back refs | |
6852 | * for the subtree | |
6853 | */ | |
6854 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
6855 | generation <= root->root_key.offset) { |
6856 | *lookup_info = 1; | |
1c4850e2 | 6857 | return 1; |
94fcca9f | 6858 | } |
1c4850e2 YZ |
6859 | |
6860 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
6861 | blocksize = btrfs_level_size(root, level - 1); | |
6862 | ||
6863 | next = btrfs_find_tree_block(root, bytenr, blocksize); | |
6864 | if (!next) { | |
6865 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
90d2c51d MX |
6866 | if (!next) |
6867 | return -ENOMEM; | |
1c4850e2 YZ |
6868 | reada = 1; |
6869 | } | |
6870 | btrfs_tree_lock(next); | |
6871 | btrfs_set_lock_blocking(next); | |
6872 | ||
94fcca9f YZ |
6873 | ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize, |
6874 | &wc->refs[level - 1], | |
6875 | &wc->flags[level - 1]); | |
79787eaa JM |
6876 | if (ret < 0) { |
6877 | btrfs_tree_unlock(next); | |
6878 | return ret; | |
6879 | } | |
6880 | ||
94fcca9f YZ |
6881 | BUG_ON(wc->refs[level - 1] == 0); |
6882 | *lookup_info = 0; | |
1c4850e2 | 6883 | |
94fcca9f | 6884 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 6885 | if (wc->refs[level - 1] > 1) { |
94fcca9f YZ |
6886 | if (level == 1 && |
6887 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6888 | goto skip; | |
6889 | ||
1c4850e2 YZ |
6890 | if (!wc->update_ref || |
6891 | generation <= root->root_key.offset) | |
6892 | goto skip; | |
6893 | ||
6894 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
6895 | path->slots[level]); | |
6896 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
6897 | if (ret < 0) | |
6898 | goto skip; | |
6899 | ||
6900 | wc->stage = UPDATE_BACKREF; | |
6901 | wc->shared_level = level - 1; | |
6902 | } | |
94fcca9f YZ |
6903 | } else { |
6904 | if (level == 1 && | |
6905 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
6906 | goto skip; | |
1c4850e2 YZ |
6907 | } |
6908 | ||
b9fab919 | 6909 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
6910 | btrfs_tree_unlock(next); |
6911 | free_extent_buffer(next); | |
6912 | next = NULL; | |
94fcca9f | 6913 | *lookup_info = 1; |
1c4850e2 YZ |
6914 | } |
6915 | ||
6916 | if (!next) { | |
6917 | if (reada && level == 1) | |
6918 | reada_walk_down(trans, root, wc, path); | |
6919 | next = read_tree_block(root, bytenr, blocksize, generation); | |
97d9a8a4 TI |
6920 | if (!next) |
6921 | return -EIO; | |
1c4850e2 YZ |
6922 | btrfs_tree_lock(next); |
6923 | btrfs_set_lock_blocking(next); | |
6924 | } | |
6925 | ||
6926 | level--; | |
6927 | BUG_ON(level != btrfs_header_level(next)); | |
6928 | path->nodes[level] = next; | |
6929 | path->slots[level] = 0; | |
bd681513 | 6930 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
6931 | wc->level = level; |
6932 | if (wc->level == 1) | |
6933 | wc->reada_slot = 0; | |
6934 | return 0; | |
6935 | skip: | |
6936 | wc->refs[level - 1] = 0; | |
6937 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
6938 | if (wc->stage == DROP_REFERENCE) { |
6939 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
6940 | parent = path->nodes[level]->start; | |
6941 | } else { | |
6942 | BUG_ON(root->root_key.objectid != | |
6943 | btrfs_header_owner(path->nodes[level])); | |
6944 | parent = 0; | |
6945 | } | |
1c4850e2 | 6946 | |
94fcca9f | 6947 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, |
66d7e7f0 | 6948 | root->root_key.objectid, level - 1, 0, 0); |
79787eaa | 6949 | BUG_ON(ret); /* -ENOMEM */ |
1c4850e2 | 6950 | } |
1c4850e2 YZ |
6951 | btrfs_tree_unlock(next); |
6952 | free_extent_buffer(next); | |
94fcca9f | 6953 | *lookup_info = 1; |
1c4850e2 YZ |
6954 | return 1; |
6955 | } | |
6956 | ||
2c47e605 | 6957 | /* |
2c016dc2 | 6958 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
6959 | * |
6960 | * when wc->stage == DROP_REFERENCE, this function drops | |
6961 | * reference count on the block. | |
6962 | * | |
6963 | * when wc->stage == UPDATE_BACKREF, this function changes | |
6964 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
6965 | * to UPDATE_BACKREF previously while processing the block. | |
6966 | * | |
6967 | * NOTE: return value 1 means we should stop walking up. | |
6968 | */ | |
6969 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
6970 | struct btrfs_root *root, | |
6971 | struct btrfs_path *path, | |
6972 | struct walk_control *wc) | |
6973 | { | |
f0486c68 | 6974 | int ret; |
2c47e605 YZ |
6975 | int level = wc->level; |
6976 | struct extent_buffer *eb = path->nodes[level]; | |
6977 | u64 parent = 0; | |
6978 | ||
6979 | if (wc->stage == UPDATE_BACKREF) { | |
6980 | BUG_ON(wc->shared_level < level); | |
6981 | if (level < wc->shared_level) | |
6982 | goto out; | |
6983 | ||
2c47e605 YZ |
6984 | ret = find_next_key(path, level + 1, &wc->update_progress); |
6985 | if (ret > 0) | |
6986 | wc->update_ref = 0; | |
6987 | ||
6988 | wc->stage = DROP_REFERENCE; | |
6989 | wc->shared_level = -1; | |
6990 | path->slots[level] = 0; | |
6991 | ||
6992 | /* | |
6993 | * check reference count again if the block isn't locked. | |
6994 | * we should start walking down the tree again if reference | |
6995 | * count is one. | |
6996 | */ | |
6997 | if (!path->locks[level]) { | |
6998 | BUG_ON(level == 0); | |
6999 | btrfs_tree_lock(eb); | |
7000 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7001 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7002 | |
7003 | ret = btrfs_lookup_extent_info(trans, root, | |
7004 | eb->start, eb->len, | |
7005 | &wc->refs[level], | |
7006 | &wc->flags[level]); | |
79787eaa JM |
7007 | if (ret < 0) { |
7008 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 7009 | path->locks[level] = 0; |
79787eaa JM |
7010 | return ret; |
7011 | } | |
2c47e605 YZ |
7012 | BUG_ON(wc->refs[level] == 0); |
7013 | if (wc->refs[level] == 1) { | |
bd681513 | 7014 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 7015 | path->locks[level] = 0; |
2c47e605 YZ |
7016 | return 1; |
7017 | } | |
f82d02d9 | 7018 | } |
2c47e605 | 7019 | } |
f82d02d9 | 7020 | |
2c47e605 YZ |
7021 | /* wc->stage == DROP_REFERENCE */ |
7022 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 7023 | |
2c47e605 YZ |
7024 | if (wc->refs[level] == 1) { |
7025 | if (level == 0) { | |
7026 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
66d7e7f0 AJ |
7027 | ret = btrfs_dec_ref(trans, root, eb, 1, |
7028 | wc->for_reloc); | |
2c47e605 | 7029 | else |
66d7e7f0 AJ |
7030 | ret = btrfs_dec_ref(trans, root, eb, 0, |
7031 | wc->for_reloc); | |
79787eaa | 7032 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
7033 | } |
7034 | /* make block locked assertion in clean_tree_block happy */ | |
7035 | if (!path->locks[level] && | |
7036 | btrfs_header_generation(eb) == trans->transid) { | |
7037 | btrfs_tree_lock(eb); | |
7038 | btrfs_set_lock_blocking(eb); | |
bd681513 | 7039 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7040 | } |
7041 | clean_tree_block(trans, root, eb); | |
7042 | } | |
7043 | ||
7044 | if (eb == root->node) { | |
7045 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7046 | parent = eb->start; | |
7047 | else | |
7048 | BUG_ON(root->root_key.objectid != | |
7049 | btrfs_header_owner(eb)); | |
7050 | } else { | |
7051 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
7052 | parent = path->nodes[level + 1]->start; | |
7053 | else | |
7054 | BUG_ON(root->root_key.objectid != | |
7055 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 7056 | } |
f82d02d9 | 7057 | |
5581a51a | 7058 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
7059 | out: |
7060 | wc->refs[level] = 0; | |
7061 | wc->flags[level] = 0; | |
f0486c68 | 7062 | return 0; |
2c47e605 YZ |
7063 | } |
7064 | ||
7065 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
7066 | struct btrfs_root *root, | |
7067 | struct btrfs_path *path, | |
7068 | struct walk_control *wc) | |
7069 | { | |
2c47e605 | 7070 | int level = wc->level; |
94fcca9f | 7071 | int lookup_info = 1; |
2c47e605 YZ |
7072 | int ret; |
7073 | ||
7074 | while (level >= 0) { | |
94fcca9f | 7075 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
7076 | if (ret > 0) |
7077 | break; | |
7078 | ||
7079 | if (level == 0) | |
7080 | break; | |
7081 | ||
7a7965f8 YZ |
7082 | if (path->slots[level] >= |
7083 | btrfs_header_nritems(path->nodes[level])) | |
7084 | break; | |
7085 | ||
94fcca9f | 7086 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
7087 | if (ret > 0) { |
7088 | path->slots[level]++; | |
7089 | continue; | |
90d2c51d MX |
7090 | } else if (ret < 0) |
7091 | return ret; | |
1c4850e2 | 7092 | level = wc->level; |
f82d02d9 | 7093 | } |
f82d02d9 YZ |
7094 | return 0; |
7095 | } | |
7096 | ||
d397712b | 7097 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 7098 | struct btrfs_root *root, |
f82d02d9 | 7099 | struct btrfs_path *path, |
2c47e605 | 7100 | struct walk_control *wc, int max_level) |
20524f02 | 7101 | { |
2c47e605 | 7102 | int level = wc->level; |
20524f02 | 7103 | int ret; |
9f3a7427 | 7104 | |
2c47e605 YZ |
7105 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
7106 | while (level < max_level && path->nodes[level]) { | |
7107 | wc->level = level; | |
7108 | if (path->slots[level] + 1 < | |
7109 | btrfs_header_nritems(path->nodes[level])) { | |
7110 | path->slots[level]++; | |
20524f02 CM |
7111 | return 0; |
7112 | } else { | |
2c47e605 YZ |
7113 | ret = walk_up_proc(trans, root, path, wc); |
7114 | if (ret > 0) | |
7115 | return 0; | |
bd56b302 | 7116 | |
2c47e605 | 7117 | if (path->locks[level]) { |
bd681513 CM |
7118 | btrfs_tree_unlock_rw(path->nodes[level], |
7119 | path->locks[level]); | |
2c47e605 | 7120 | path->locks[level] = 0; |
f82d02d9 | 7121 | } |
2c47e605 YZ |
7122 | free_extent_buffer(path->nodes[level]); |
7123 | path->nodes[level] = NULL; | |
7124 | level++; | |
20524f02 CM |
7125 | } |
7126 | } | |
7127 | return 1; | |
7128 | } | |
7129 | ||
9aca1d51 | 7130 | /* |
2c47e605 YZ |
7131 | * drop a subvolume tree. |
7132 | * | |
7133 | * this function traverses the tree freeing any blocks that only | |
7134 | * referenced by the tree. | |
7135 | * | |
7136 | * when a shared tree block is found. this function decreases its | |
7137 | * reference count by one. if update_ref is true, this function | |
7138 | * also make sure backrefs for the shared block and all lower level | |
7139 | * blocks are properly updated. | |
9aca1d51 | 7140 | */ |
2c536799 | 7141 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
7142 | struct btrfs_block_rsv *block_rsv, int update_ref, |
7143 | int for_reloc) | |
20524f02 | 7144 | { |
5caf2a00 | 7145 | struct btrfs_path *path; |
2c47e605 YZ |
7146 | struct btrfs_trans_handle *trans; |
7147 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
9f3a7427 | 7148 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
7149 | struct walk_control *wc; |
7150 | struct btrfs_key key; | |
7151 | int err = 0; | |
7152 | int ret; | |
7153 | int level; | |
20524f02 | 7154 | |
5caf2a00 | 7155 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
7156 | if (!path) { |
7157 | err = -ENOMEM; | |
7158 | goto out; | |
7159 | } | |
20524f02 | 7160 | |
2c47e605 | 7161 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
7162 | if (!wc) { |
7163 | btrfs_free_path(path); | |
cb1b69f4 TI |
7164 | err = -ENOMEM; |
7165 | goto out; | |
38a1a919 | 7166 | } |
2c47e605 | 7167 | |
a22285a6 | 7168 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7169 | if (IS_ERR(trans)) { |
7170 | err = PTR_ERR(trans); | |
7171 | goto out_free; | |
7172 | } | |
98d5dc13 | 7173 | |
3fd0a558 YZ |
7174 | if (block_rsv) |
7175 | trans->block_rsv = block_rsv; | |
2c47e605 | 7176 | |
9f3a7427 | 7177 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 7178 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
7179 | path->nodes[level] = btrfs_lock_root_node(root); |
7180 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 7181 | path->slots[level] = 0; |
bd681513 | 7182 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7183 | memset(&wc->update_progress, 0, |
7184 | sizeof(wc->update_progress)); | |
9f3a7427 | 7185 | } else { |
9f3a7427 | 7186 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
7187 | memcpy(&wc->update_progress, &key, |
7188 | sizeof(wc->update_progress)); | |
7189 | ||
6702ed49 | 7190 | level = root_item->drop_level; |
2c47e605 | 7191 | BUG_ON(level == 0); |
6702ed49 | 7192 | path->lowest_level = level; |
2c47e605 YZ |
7193 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
7194 | path->lowest_level = 0; | |
7195 | if (ret < 0) { | |
7196 | err = ret; | |
79787eaa | 7197 | goto out_end_trans; |
9f3a7427 | 7198 | } |
1c4850e2 | 7199 | WARN_ON(ret > 0); |
2c47e605 | 7200 | |
7d9eb12c CM |
7201 | /* |
7202 | * unlock our path, this is safe because only this | |
7203 | * function is allowed to delete this snapshot | |
7204 | */ | |
5d4f98a2 | 7205 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
7206 | |
7207 | level = btrfs_header_level(root->node); | |
7208 | while (1) { | |
7209 | btrfs_tree_lock(path->nodes[level]); | |
7210 | btrfs_set_lock_blocking(path->nodes[level]); | |
7211 | ||
7212 | ret = btrfs_lookup_extent_info(trans, root, | |
7213 | path->nodes[level]->start, | |
7214 | path->nodes[level]->len, | |
7215 | &wc->refs[level], | |
7216 | &wc->flags[level]); | |
79787eaa JM |
7217 | if (ret < 0) { |
7218 | err = ret; | |
7219 | goto out_end_trans; | |
7220 | } | |
2c47e605 YZ |
7221 | BUG_ON(wc->refs[level] == 0); |
7222 | ||
7223 | if (level == root_item->drop_level) | |
7224 | break; | |
7225 | ||
7226 | btrfs_tree_unlock(path->nodes[level]); | |
7227 | WARN_ON(wc->refs[level] != 1); | |
7228 | level--; | |
7229 | } | |
9f3a7427 | 7230 | } |
2c47e605 YZ |
7231 | |
7232 | wc->level = level; | |
7233 | wc->shared_level = -1; | |
7234 | wc->stage = DROP_REFERENCE; | |
7235 | wc->update_ref = update_ref; | |
7236 | wc->keep_locks = 0; | |
66d7e7f0 | 7237 | wc->for_reloc = for_reloc; |
1c4850e2 | 7238 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
2c47e605 | 7239 | |
d397712b | 7240 | while (1) { |
2c47e605 YZ |
7241 | ret = walk_down_tree(trans, root, path, wc); |
7242 | if (ret < 0) { | |
7243 | err = ret; | |
20524f02 | 7244 | break; |
2c47e605 | 7245 | } |
9aca1d51 | 7246 | |
2c47e605 YZ |
7247 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
7248 | if (ret < 0) { | |
7249 | err = ret; | |
20524f02 | 7250 | break; |
2c47e605 YZ |
7251 | } |
7252 | ||
7253 | if (ret > 0) { | |
7254 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
7255 | break; |
7256 | } | |
2c47e605 YZ |
7257 | |
7258 | if (wc->stage == DROP_REFERENCE) { | |
7259 | level = wc->level; | |
7260 | btrfs_node_key(path->nodes[level], | |
7261 | &root_item->drop_progress, | |
7262 | path->slots[level]); | |
7263 | root_item->drop_level = level; | |
7264 | } | |
7265 | ||
7266 | BUG_ON(wc->level == 0); | |
3fd0a558 | 7267 | if (btrfs_should_end_transaction(trans, tree_root)) { |
2c47e605 YZ |
7268 | ret = btrfs_update_root(trans, tree_root, |
7269 | &root->root_key, | |
7270 | root_item); | |
79787eaa JM |
7271 | if (ret) { |
7272 | btrfs_abort_transaction(trans, tree_root, ret); | |
7273 | err = ret; | |
7274 | goto out_end_trans; | |
7275 | } | |
2c47e605 | 7276 | |
3fd0a558 | 7277 | btrfs_end_transaction_throttle(trans, tree_root); |
a22285a6 | 7278 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
7279 | if (IS_ERR(trans)) { |
7280 | err = PTR_ERR(trans); | |
7281 | goto out_free; | |
7282 | } | |
3fd0a558 YZ |
7283 | if (block_rsv) |
7284 | trans->block_rsv = block_rsv; | |
c3e69d58 | 7285 | } |
20524f02 | 7286 | } |
b3b4aa74 | 7287 | btrfs_release_path(path); |
79787eaa JM |
7288 | if (err) |
7289 | goto out_end_trans; | |
2c47e605 YZ |
7290 | |
7291 | ret = btrfs_del_root(trans, tree_root, &root->root_key); | |
79787eaa JM |
7292 | if (ret) { |
7293 | btrfs_abort_transaction(trans, tree_root, ret); | |
7294 | goto out_end_trans; | |
7295 | } | |
2c47e605 | 7296 | |
76dda93c YZ |
7297 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
7298 | ret = btrfs_find_last_root(tree_root, root->root_key.objectid, | |
7299 | NULL, NULL); | |
79787eaa JM |
7300 | if (ret < 0) { |
7301 | btrfs_abort_transaction(trans, tree_root, ret); | |
7302 | err = ret; | |
7303 | goto out_end_trans; | |
7304 | } else if (ret > 0) { | |
84cd948c JB |
7305 | /* if we fail to delete the orphan item this time |
7306 | * around, it'll get picked up the next time. | |
7307 | * | |
7308 | * The most common failure here is just -ENOENT. | |
7309 | */ | |
7310 | btrfs_del_orphan_item(trans, tree_root, | |
7311 | root->root_key.objectid); | |
76dda93c YZ |
7312 | } |
7313 | } | |
7314 | ||
7315 | if (root->in_radix) { | |
7316 | btrfs_free_fs_root(tree_root->fs_info, root); | |
7317 | } else { | |
7318 | free_extent_buffer(root->node); | |
7319 | free_extent_buffer(root->commit_root); | |
7320 | kfree(root); | |
7321 | } | |
79787eaa | 7322 | out_end_trans: |
3fd0a558 | 7323 | btrfs_end_transaction_throttle(trans, tree_root); |
79787eaa | 7324 | out_free: |
2c47e605 | 7325 | kfree(wc); |
5caf2a00 | 7326 | btrfs_free_path(path); |
cb1b69f4 TI |
7327 | out: |
7328 | if (err) | |
7329 | btrfs_std_error(root->fs_info, err); | |
2c536799 | 7330 | return err; |
20524f02 | 7331 | } |
9078a3e1 | 7332 | |
2c47e605 YZ |
7333 | /* |
7334 | * drop subtree rooted at tree block 'node'. | |
7335 | * | |
7336 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 7337 | * only used by relocation code |
2c47e605 | 7338 | */ |
f82d02d9 YZ |
7339 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
7340 | struct btrfs_root *root, | |
7341 | struct extent_buffer *node, | |
7342 | struct extent_buffer *parent) | |
7343 | { | |
7344 | struct btrfs_path *path; | |
2c47e605 | 7345 | struct walk_control *wc; |
f82d02d9 YZ |
7346 | int level; |
7347 | int parent_level; | |
7348 | int ret = 0; | |
7349 | int wret; | |
7350 | ||
2c47e605 YZ |
7351 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
7352 | ||
f82d02d9 | 7353 | path = btrfs_alloc_path(); |
db5b493a TI |
7354 | if (!path) |
7355 | return -ENOMEM; | |
f82d02d9 | 7356 | |
2c47e605 | 7357 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
7358 | if (!wc) { |
7359 | btrfs_free_path(path); | |
7360 | return -ENOMEM; | |
7361 | } | |
2c47e605 | 7362 | |
b9447ef8 | 7363 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
7364 | parent_level = btrfs_header_level(parent); |
7365 | extent_buffer_get(parent); | |
7366 | path->nodes[parent_level] = parent; | |
7367 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
7368 | ||
b9447ef8 | 7369 | btrfs_assert_tree_locked(node); |
f82d02d9 | 7370 | level = btrfs_header_level(node); |
f82d02d9 YZ |
7371 | path->nodes[level] = node; |
7372 | path->slots[level] = 0; | |
bd681513 | 7373 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
7374 | |
7375 | wc->refs[parent_level] = 1; | |
7376 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
7377 | wc->level = level; | |
7378 | wc->shared_level = -1; | |
7379 | wc->stage = DROP_REFERENCE; | |
7380 | wc->update_ref = 0; | |
7381 | wc->keep_locks = 1; | |
66d7e7f0 | 7382 | wc->for_reloc = 1; |
1c4850e2 | 7383 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); |
f82d02d9 YZ |
7384 | |
7385 | while (1) { | |
2c47e605 YZ |
7386 | wret = walk_down_tree(trans, root, path, wc); |
7387 | if (wret < 0) { | |
f82d02d9 | 7388 | ret = wret; |
f82d02d9 | 7389 | break; |
2c47e605 | 7390 | } |
f82d02d9 | 7391 | |
2c47e605 | 7392 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
7393 | if (wret < 0) |
7394 | ret = wret; | |
7395 | if (wret != 0) | |
7396 | break; | |
7397 | } | |
7398 | ||
2c47e605 | 7399 | kfree(wc); |
f82d02d9 YZ |
7400 | btrfs_free_path(path); |
7401 | return ret; | |
7402 | } | |
7403 | ||
ec44a35c CM |
7404 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
7405 | { | |
7406 | u64 num_devices; | |
fc67c450 | 7407 | u64 stripped; |
e4d8ec0f | 7408 | |
fc67c450 ID |
7409 | /* |
7410 | * if restripe for this chunk_type is on pick target profile and | |
7411 | * return, otherwise do the usual balance | |
7412 | */ | |
7413 | stripped = get_restripe_target(root->fs_info, flags); | |
7414 | if (stripped) | |
7415 | return extended_to_chunk(stripped); | |
e4d8ec0f | 7416 | |
cd02dca5 CM |
7417 | /* |
7418 | * we add in the count of missing devices because we want | |
7419 | * to make sure that any RAID levels on a degraded FS | |
7420 | * continue to be honored. | |
7421 | */ | |
7422 | num_devices = root->fs_info->fs_devices->rw_devices + | |
7423 | root->fs_info->fs_devices->missing_devices; | |
7424 | ||
fc67c450 | 7425 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 7426 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
7427 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
7428 | ||
ec44a35c CM |
7429 | if (num_devices == 1) { |
7430 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7431 | stripped = flags & ~stripped; | |
7432 | ||
7433 | /* turn raid0 into single device chunks */ | |
7434 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
7435 | return stripped; | |
7436 | ||
7437 | /* turn mirroring into duplication */ | |
7438 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7439 | BTRFS_BLOCK_GROUP_RAID10)) | |
7440 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
7441 | } else { |
7442 | /* they already had raid on here, just return */ | |
ec44a35c CM |
7443 | if (flags & stripped) |
7444 | return flags; | |
7445 | ||
7446 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
7447 | stripped = flags & ~stripped; | |
7448 | ||
7449 | /* switch duplicated blocks with raid1 */ | |
7450 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
7451 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
7452 | ||
e3176ca2 | 7453 | /* this is drive concat, leave it alone */ |
ec44a35c | 7454 | } |
e3176ca2 | 7455 | |
ec44a35c CM |
7456 | return flags; |
7457 | } | |
7458 | ||
199c36ea | 7459 | static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 7460 | { |
f0486c68 YZ |
7461 | struct btrfs_space_info *sinfo = cache->space_info; |
7462 | u64 num_bytes; | |
199c36ea | 7463 | u64 min_allocable_bytes; |
f0486c68 | 7464 | int ret = -ENOSPC; |
0ef3e66b | 7465 | |
c286ac48 | 7466 | |
199c36ea MX |
7467 | /* |
7468 | * We need some metadata space and system metadata space for | |
7469 | * allocating chunks in some corner cases until we force to set | |
7470 | * it to be readonly. | |
7471 | */ | |
7472 | if ((sinfo->flags & | |
7473 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
7474 | !force) | |
7475 | min_allocable_bytes = 1 * 1024 * 1024; | |
7476 | else | |
7477 | min_allocable_bytes = 0; | |
7478 | ||
f0486c68 YZ |
7479 | spin_lock(&sinfo->lock); |
7480 | spin_lock(&cache->lock); | |
61cfea9b W |
7481 | |
7482 | if (cache->ro) { | |
7483 | ret = 0; | |
7484 | goto out; | |
7485 | } | |
7486 | ||
f0486c68 YZ |
7487 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
7488 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7489 | ||
7490 | if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + | |
37be25bc JB |
7491 | sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes + |
7492 | min_allocable_bytes <= sinfo->total_bytes) { | |
f0486c68 | 7493 | sinfo->bytes_readonly += num_bytes; |
f0486c68 YZ |
7494 | cache->ro = 1; |
7495 | ret = 0; | |
7496 | } | |
61cfea9b | 7497 | out: |
f0486c68 YZ |
7498 | spin_unlock(&cache->lock); |
7499 | spin_unlock(&sinfo->lock); | |
7500 | return ret; | |
7501 | } | |
7d9eb12c | 7502 | |
f0486c68 YZ |
7503 | int btrfs_set_block_group_ro(struct btrfs_root *root, |
7504 | struct btrfs_block_group_cache *cache) | |
c286ac48 | 7505 | |
f0486c68 YZ |
7506 | { |
7507 | struct btrfs_trans_handle *trans; | |
7508 | u64 alloc_flags; | |
7509 | int ret; | |
7d9eb12c | 7510 | |
f0486c68 | 7511 | BUG_ON(cache->ro); |
0ef3e66b | 7512 | |
ff5714cc | 7513 | trans = btrfs_join_transaction(root); |
79787eaa JM |
7514 | if (IS_ERR(trans)) |
7515 | return PTR_ERR(trans); | |
5d4f98a2 | 7516 | |
f0486c68 | 7517 | alloc_flags = update_block_group_flags(root, cache->flags); |
79787eaa | 7518 | if (alloc_flags != cache->flags) { |
698d0082 | 7519 | ret = do_chunk_alloc(trans, root, alloc_flags, |
79787eaa JM |
7520 | CHUNK_ALLOC_FORCE); |
7521 | if (ret < 0) | |
7522 | goto out; | |
7523 | } | |
5d4f98a2 | 7524 | |
199c36ea | 7525 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7526 | if (!ret) |
7527 | goto out; | |
7528 | alloc_flags = get_alloc_profile(root, cache->space_info->flags); | |
698d0082 | 7529 | ret = do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7530 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
7531 | if (ret < 0) |
7532 | goto out; | |
199c36ea | 7533 | ret = set_block_group_ro(cache, 0); |
f0486c68 YZ |
7534 | out: |
7535 | btrfs_end_transaction(trans, root); | |
7536 | return ret; | |
7537 | } | |
5d4f98a2 | 7538 | |
c87f08ca CM |
7539 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
7540 | struct btrfs_root *root, u64 type) | |
7541 | { | |
7542 | u64 alloc_flags = get_alloc_profile(root, type); | |
698d0082 | 7543 | return do_chunk_alloc(trans, root, alloc_flags, |
0e4f8f88 | 7544 | CHUNK_ALLOC_FORCE); |
c87f08ca CM |
7545 | } |
7546 | ||
6d07bcec MX |
7547 | /* |
7548 | * helper to account the unused space of all the readonly block group in the | |
7549 | * list. takes mirrors into account. | |
7550 | */ | |
7551 | static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) | |
7552 | { | |
7553 | struct btrfs_block_group_cache *block_group; | |
7554 | u64 free_bytes = 0; | |
7555 | int factor; | |
7556 | ||
7557 | list_for_each_entry(block_group, groups_list, list) { | |
7558 | spin_lock(&block_group->lock); | |
7559 | ||
7560 | if (!block_group->ro) { | |
7561 | spin_unlock(&block_group->lock); | |
7562 | continue; | |
7563 | } | |
7564 | ||
7565 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
7566 | BTRFS_BLOCK_GROUP_RAID10 | | |
7567 | BTRFS_BLOCK_GROUP_DUP)) | |
7568 | factor = 2; | |
7569 | else | |
7570 | factor = 1; | |
7571 | ||
7572 | free_bytes += (block_group->key.offset - | |
7573 | btrfs_block_group_used(&block_group->item)) * | |
7574 | factor; | |
7575 | ||
7576 | spin_unlock(&block_group->lock); | |
7577 | } | |
7578 | ||
7579 | return free_bytes; | |
7580 | } | |
7581 | ||
7582 | /* | |
7583 | * helper to account the unused space of all the readonly block group in the | |
7584 | * space_info. takes mirrors into account. | |
7585 | */ | |
7586 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) | |
7587 | { | |
7588 | int i; | |
7589 | u64 free_bytes = 0; | |
7590 | ||
7591 | spin_lock(&sinfo->lock); | |
7592 | ||
7593 | for(i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
7594 | if (!list_empty(&sinfo->block_groups[i])) | |
7595 | free_bytes += __btrfs_get_ro_block_group_free_space( | |
7596 | &sinfo->block_groups[i]); | |
7597 | ||
7598 | spin_unlock(&sinfo->lock); | |
7599 | ||
7600 | return free_bytes; | |
7601 | } | |
7602 | ||
143bede5 | 7603 | void btrfs_set_block_group_rw(struct btrfs_root *root, |
f0486c68 | 7604 | struct btrfs_block_group_cache *cache) |
5d4f98a2 | 7605 | { |
f0486c68 YZ |
7606 | struct btrfs_space_info *sinfo = cache->space_info; |
7607 | u64 num_bytes; | |
7608 | ||
7609 | BUG_ON(!cache->ro); | |
7610 | ||
7611 | spin_lock(&sinfo->lock); | |
7612 | spin_lock(&cache->lock); | |
7613 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - | |
7614 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
7615 | sinfo->bytes_readonly -= num_bytes; | |
7616 | cache->ro = 0; | |
7617 | spin_unlock(&cache->lock); | |
7618 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
7619 | } |
7620 | ||
ba1bf481 JB |
7621 | /* |
7622 | * checks to see if its even possible to relocate this block group. | |
7623 | * | |
7624 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
7625 | * ok to go ahead and try. | |
7626 | */ | |
7627 | int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) | |
1a40e23b | 7628 | { |
ba1bf481 JB |
7629 | struct btrfs_block_group_cache *block_group; |
7630 | struct btrfs_space_info *space_info; | |
7631 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
7632 | struct btrfs_device *device; | |
cdcb725c | 7633 | u64 min_free; |
6719db6a JB |
7634 | u64 dev_min = 1; |
7635 | u64 dev_nr = 0; | |
4a5e98f5 | 7636 | u64 target; |
cdcb725c | 7637 | int index; |
ba1bf481 JB |
7638 | int full = 0; |
7639 | int ret = 0; | |
1a40e23b | 7640 | |
ba1bf481 | 7641 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
1a40e23b | 7642 | |
ba1bf481 JB |
7643 | /* odd, couldn't find the block group, leave it alone */ |
7644 | if (!block_group) | |
7645 | return -1; | |
1a40e23b | 7646 | |
cdcb725c | 7647 | min_free = btrfs_block_group_used(&block_group->item); |
7648 | ||
ba1bf481 | 7649 | /* no bytes used, we're good */ |
cdcb725c | 7650 | if (!min_free) |
1a40e23b ZY |
7651 | goto out; |
7652 | ||
ba1bf481 JB |
7653 | space_info = block_group->space_info; |
7654 | spin_lock(&space_info->lock); | |
17d217fe | 7655 | |
ba1bf481 | 7656 | full = space_info->full; |
17d217fe | 7657 | |
ba1bf481 JB |
7658 | /* |
7659 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
7660 | * relocate it unless we're able to allocate a new chunk below. |
7661 | * | |
7662 | * Otherwise, we need to make sure we have room in the space to handle | |
7663 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 7664 | */ |
7ce618db | 7665 | if ((space_info->total_bytes != block_group->key.offset) && |
cdcb725c | 7666 | (space_info->bytes_used + space_info->bytes_reserved + |
7667 | space_info->bytes_pinned + space_info->bytes_readonly + | |
7668 | min_free < space_info->total_bytes)) { | |
ba1bf481 JB |
7669 | spin_unlock(&space_info->lock); |
7670 | goto out; | |
17d217fe | 7671 | } |
ba1bf481 | 7672 | spin_unlock(&space_info->lock); |
ea8c2819 | 7673 | |
ba1bf481 JB |
7674 | /* |
7675 | * ok we don't have enough space, but maybe we have free space on our | |
7676 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
7677 | * alloc devices and guess if we have enough space. if this block |
7678 | * group is going to be restriped, run checks against the target | |
7679 | * profile instead of the current one. | |
ba1bf481 JB |
7680 | */ |
7681 | ret = -1; | |
ea8c2819 | 7682 | |
cdcb725c | 7683 | /* |
7684 | * index: | |
7685 | * 0: raid10 | |
7686 | * 1: raid1 | |
7687 | * 2: dup | |
7688 | * 3: raid0 | |
7689 | * 4: single | |
7690 | */ | |
4a5e98f5 ID |
7691 | target = get_restripe_target(root->fs_info, block_group->flags); |
7692 | if (target) { | |
31e50229 | 7693 | index = __get_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
7694 | } else { |
7695 | /* | |
7696 | * this is just a balance, so if we were marked as full | |
7697 | * we know there is no space for a new chunk | |
7698 | */ | |
7699 | if (full) | |
7700 | goto out; | |
7701 | ||
7702 | index = get_block_group_index(block_group); | |
7703 | } | |
7704 | ||
e6ec716f | 7705 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 7706 | dev_min = 4; |
6719db6a JB |
7707 | /* Divide by 2 */ |
7708 | min_free >>= 1; | |
e6ec716f | 7709 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 7710 | dev_min = 2; |
e6ec716f | 7711 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
7712 | /* Multiply by 2 */ |
7713 | min_free <<= 1; | |
e6ec716f | 7714 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 7715 | dev_min = fs_devices->rw_devices; |
6719db6a | 7716 | do_div(min_free, dev_min); |
cdcb725c | 7717 | } |
7718 | ||
ba1bf481 JB |
7719 | mutex_lock(&root->fs_info->chunk_mutex); |
7720 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
7bfc837d | 7721 | u64 dev_offset; |
56bec294 | 7722 | |
ba1bf481 JB |
7723 | /* |
7724 | * check to make sure we can actually find a chunk with enough | |
7725 | * space to fit our block group in. | |
7726 | */ | |
63a212ab SB |
7727 | if (device->total_bytes > device->bytes_used + min_free && |
7728 | !device->is_tgtdev_for_dev_replace) { | |
125ccb0a | 7729 | ret = find_free_dev_extent(device, min_free, |
7bfc837d | 7730 | &dev_offset, NULL); |
ba1bf481 | 7731 | if (!ret) |
cdcb725c | 7732 | dev_nr++; |
7733 | ||
7734 | if (dev_nr >= dev_min) | |
73e48b27 | 7735 | break; |
cdcb725c | 7736 | |
ba1bf481 | 7737 | ret = -1; |
725c8463 | 7738 | } |
edbd8d4e | 7739 | } |
ba1bf481 | 7740 | mutex_unlock(&root->fs_info->chunk_mutex); |
edbd8d4e | 7741 | out: |
ba1bf481 | 7742 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
7743 | return ret; |
7744 | } | |
7745 | ||
b2950863 CH |
7746 | static int find_first_block_group(struct btrfs_root *root, |
7747 | struct btrfs_path *path, struct btrfs_key *key) | |
0b86a832 | 7748 | { |
925baedd | 7749 | int ret = 0; |
0b86a832 CM |
7750 | struct btrfs_key found_key; |
7751 | struct extent_buffer *leaf; | |
7752 | int slot; | |
edbd8d4e | 7753 | |
0b86a832 CM |
7754 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
7755 | if (ret < 0) | |
925baedd CM |
7756 | goto out; |
7757 | ||
d397712b | 7758 | while (1) { |
0b86a832 | 7759 | slot = path->slots[0]; |
edbd8d4e | 7760 | leaf = path->nodes[0]; |
0b86a832 CM |
7761 | if (slot >= btrfs_header_nritems(leaf)) { |
7762 | ret = btrfs_next_leaf(root, path); | |
7763 | if (ret == 0) | |
7764 | continue; | |
7765 | if (ret < 0) | |
925baedd | 7766 | goto out; |
0b86a832 | 7767 | break; |
edbd8d4e | 7768 | } |
0b86a832 | 7769 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 7770 | |
0b86a832 | 7771 | if (found_key.objectid >= key->objectid && |
925baedd CM |
7772 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
7773 | ret = 0; | |
7774 | goto out; | |
7775 | } | |
0b86a832 | 7776 | path->slots[0]++; |
edbd8d4e | 7777 | } |
925baedd | 7778 | out: |
0b86a832 | 7779 | return ret; |
edbd8d4e CM |
7780 | } |
7781 | ||
0af3d00b JB |
7782 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
7783 | { | |
7784 | struct btrfs_block_group_cache *block_group; | |
7785 | u64 last = 0; | |
7786 | ||
7787 | while (1) { | |
7788 | struct inode *inode; | |
7789 | ||
7790 | block_group = btrfs_lookup_first_block_group(info, last); | |
7791 | while (block_group) { | |
7792 | spin_lock(&block_group->lock); | |
7793 | if (block_group->iref) | |
7794 | break; | |
7795 | spin_unlock(&block_group->lock); | |
7796 | block_group = next_block_group(info->tree_root, | |
7797 | block_group); | |
7798 | } | |
7799 | if (!block_group) { | |
7800 | if (last == 0) | |
7801 | break; | |
7802 | last = 0; | |
7803 | continue; | |
7804 | } | |
7805 | ||
7806 | inode = block_group->inode; | |
7807 | block_group->iref = 0; | |
7808 | block_group->inode = NULL; | |
7809 | spin_unlock(&block_group->lock); | |
7810 | iput(inode); | |
7811 | last = block_group->key.objectid + block_group->key.offset; | |
7812 | btrfs_put_block_group(block_group); | |
7813 | } | |
7814 | } | |
7815 | ||
1a40e23b ZY |
7816 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
7817 | { | |
7818 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 7819 | struct btrfs_space_info *space_info; |
11833d66 | 7820 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
7821 | struct rb_node *n; |
7822 | ||
11833d66 YZ |
7823 | down_write(&info->extent_commit_sem); |
7824 | while (!list_empty(&info->caching_block_groups)) { | |
7825 | caching_ctl = list_entry(info->caching_block_groups.next, | |
7826 | struct btrfs_caching_control, list); | |
7827 | list_del(&caching_ctl->list); | |
7828 | put_caching_control(caching_ctl); | |
7829 | } | |
7830 | up_write(&info->extent_commit_sem); | |
7831 | ||
1a40e23b ZY |
7832 | spin_lock(&info->block_group_cache_lock); |
7833 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
7834 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
7835 | cache_node); | |
1a40e23b ZY |
7836 | rb_erase(&block_group->cache_node, |
7837 | &info->block_group_cache_tree); | |
d899e052 YZ |
7838 | spin_unlock(&info->block_group_cache_lock); |
7839 | ||
80eb234a | 7840 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 7841 | list_del(&block_group->list); |
80eb234a | 7842 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 7843 | |
817d52f8 | 7844 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 7845 | wait_block_group_cache_done(block_group); |
817d52f8 | 7846 | |
3c14874a JB |
7847 | /* |
7848 | * We haven't cached this block group, which means we could | |
7849 | * possibly have excluded extents on this block group. | |
7850 | */ | |
7851 | if (block_group->cached == BTRFS_CACHE_NO) | |
7852 | free_excluded_extents(info->extent_root, block_group); | |
7853 | ||
817d52f8 | 7854 | btrfs_remove_free_space_cache(block_group); |
11dfe35a | 7855 | btrfs_put_block_group(block_group); |
d899e052 YZ |
7856 | |
7857 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
7858 | } |
7859 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
7860 | |
7861 | /* now that all the block groups are freed, go through and | |
7862 | * free all the space_info structs. This is only called during | |
7863 | * the final stages of unmount, and so we know nobody is | |
7864 | * using them. We call synchronize_rcu() once before we start, | |
7865 | * just to be on the safe side. | |
7866 | */ | |
7867 | synchronize_rcu(); | |
7868 | ||
8929ecfa YZ |
7869 | release_global_block_rsv(info); |
7870 | ||
4184ea7f CM |
7871 | while(!list_empty(&info->space_info)) { |
7872 | space_info = list_entry(info->space_info.next, | |
7873 | struct btrfs_space_info, | |
7874 | list); | |
b069e0c3 DS |
7875 | if (btrfs_test_opt(info->tree_root, ENOSPC_DEBUG)) { |
7876 | if (space_info->bytes_pinned > 0 || | |
7877 | space_info->bytes_reserved > 0 || | |
7878 | space_info->bytes_may_use > 0) { | |
7879 | WARN_ON(1); | |
7880 | dump_space_info(space_info, 0, 0); | |
7881 | } | |
f0486c68 | 7882 | } |
4184ea7f CM |
7883 | list_del(&space_info->list); |
7884 | kfree(space_info); | |
7885 | } | |
1a40e23b ZY |
7886 | return 0; |
7887 | } | |
7888 | ||
b742bb82 YZ |
7889 | static void __link_block_group(struct btrfs_space_info *space_info, |
7890 | struct btrfs_block_group_cache *cache) | |
7891 | { | |
7892 | int index = get_block_group_index(cache); | |
7893 | ||
7894 | down_write(&space_info->groups_sem); | |
7895 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
7896 | up_write(&space_info->groups_sem); | |
7897 | } | |
7898 | ||
9078a3e1 CM |
7899 | int btrfs_read_block_groups(struct btrfs_root *root) |
7900 | { | |
7901 | struct btrfs_path *path; | |
7902 | int ret; | |
9078a3e1 | 7903 | struct btrfs_block_group_cache *cache; |
be744175 | 7904 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 7905 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
7906 | struct btrfs_key key; |
7907 | struct btrfs_key found_key; | |
5f39d397 | 7908 | struct extent_buffer *leaf; |
0af3d00b JB |
7909 | int need_clear = 0; |
7910 | u64 cache_gen; | |
96b5179d | 7911 | |
be744175 | 7912 | root = info->extent_root; |
9078a3e1 | 7913 | key.objectid = 0; |
0b86a832 | 7914 | key.offset = 0; |
9078a3e1 | 7915 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
7916 | path = btrfs_alloc_path(); |
7917 | if (!path) | |
7918 | return -ENOMEM; | |
026fd317 | 7919 | path->reada = 1; |
9078a3e1 | 7920 | |
6c41761f | 7921 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 | 7922 | if (btrfs_test_opt(root, SPACE_CACHE) && |
6c41761f | 7923 | btrfs_super_generation(root->fs_info->super_copy) != cache_gen) |
0af3d00b | 7924 | need_clear = 1; |
88c2ba3b JB |
7925 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
7926 | need_clear = 1; | |
0af3d00b | 7927 | |
d397712b | 7928 | while (1) { |
0b86a832 | 7929 | ret = find_first_block_group(root, path, &key); |
b742bb82 YZ |
7930 | if (ret > 0) |
7931 | break; | |
0b86a832 CM |
7932 | if (ret != 0) |
7933 | goto error; | |
5f39d397 CM |
7934 | leaf = path->nodes[0]; |
7935 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 7936 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 7937 | if (!cache) { |
0b86a832 | 7938 | ret = -ENOMEM; |
f0486c68 | 7939 | goto error; |
9078a3e1 | 7940 | } |
34d52cb6 LZ |
7941 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
7942 | GFP_NOFS); | |
7943 | if (!cache->free_space_ctl) { | |
7944 | kfree(cache); | |
7945 | ret = -ENOMEM; | |
7946 | goto error; | |
7947 | } | |
3e1ad54f | 7948 | |
d2fb3437 | 7949 | atomic_set(&cache->count, 1); |
c286ac48 | 7950 | spin_lock_init(&cache->lock); |
817d52f8 | 7951 | cache->fs_info = info; |
0f9dd46c | 7952 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 7953 | INIT_LIST_HEAD(&cache->cluster_list); |
96303081 | 7954 | |
cf7c1ef6 LB |
7955 | if (need_clear) { |
7956 | /* | |
7957 | * When we mount with old space cache, we need to | |
7958 | * set BTRFS_DC_CLEAR and set dirty flag. | |
7959 | * | |
7960 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
7961 | * truncate the old free space cache inode and | |
7962 | * setup a new one. | |
7963 | * b) Setting 'dirty flag' makes sure that we flush | |
7964 | * the new space cache info onto disk. | |
7965 | */ | |
0af3d00b | 7966 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 LB |
7967 | if (btrfs_test_opt(root, SPACE_CACHE)) |
7968 | cache->dirty = 1; | |
7969 | } | |
0af3d00b | 7970 | |
5f39d397 CM |
7971 | read_extent_buffer(leaf, &cache->item, |
7972 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
7973 | sizeof(cache->item)); | |
9078a3e1 | 7974 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 7975 | |
9078a3e1 | 7976 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 7977 | btrfs_release_path(path); |
0b86a832 | 7978 | cache->flags = btrfs_block_group_flags(&cache->item); |
817d52f8 | 7979 | cache->sectorsize = root->sectorsize; |
53b381b3 DW |
7980 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
7981 | &root->fs_info->mapping_tree, | |
7982 | found_key.objectid); | |
34d52cb6 LZ |
7983 | btrfs_init_free_space_ctl(cache); |
7984 | ||
3c14874a JB |
7985 | /* |
7986 | * We need to exclude the super stripes now so that the space | |
7987 | * info has super bytes accounted for, otherwise we'll think | |
7988 | * we have more space than we actually do. | |
7989 | */ | |
835d974f JB |
7990 | ret = exclude_super_stripes(root, cache); |
7991 | if (ret) { | |
7992 | /* | |
7993 | * We may have excluded something, so call this just in | |
7994 | * case. | |
7995 | */ | |
7996 | free_excluded_extents(root, cache); | |
7997 | kfree(cache->free_space_ctl); | |
7998 | kfree(cache); | |
7999 | goto error; | |
8000 | } | |
3c14874a | 8001 | |
817d52f8 JB |
8002 | /* |
8003 | * check for two cases, either we are full, and therefore | |
8004 | * don't need to bother with the caching work since we won't | |
8005 | * find any space, or we are empty, and we can just add all | |
8006 | * the space in and be done with it. This saves us _alot_ of | |
8007 | * time, particularly in the full case. | |
8008 | */ | |
8009 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 8010 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8011 | cache->cached = BTRFS_CACHE_FINISHED; |
1b2da372 | 8012 | free_excluded_extents(root, cache); |
817d52f8 | 8013 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 8014 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 JB |
8015 | cache->cached = BTRFS_CACHE_FINISHED; |
8016 | add_new_free_space(cache, root->fs_info, | |
8017 | found_key.objectid, | |
8018 | found_key.objectid + | |
8019 | found_key.offset); | |
11833d66 | 8020 | free_excluded_extents(root, cache); |
817d52f8 | 8021 | } |
96b5179d | 8022 | |
6324fbf3 CM |
8023 | ret = update_space_info(info, cache->flags, found_key.offset, |
8024 | btrfs_block_group_used(&cache->item), | |
8025 | &space_info); | |
79787eaa | 8026 | BUG_ON(ret); /* -ENOMEM */ |
6324fbf3 | 8027 | cache->space_info = space_info; |
1b2da372 | 8028 | spin_lock(&cache->space_info->lock); |
f0486c68 | 8029 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8030 | spin_unlock(&cache->space_info->lock); |
8031 | ||
b742bb82 | 8032 | __link_block_group(space_info, cache); |
0f9dd46c JB |
8033 | |
8034 | ret = btrfs_add_block_group_cache(root->fs_info, cache); | |
79787eaa | 8035 | BUG_ON(ret); /* Logic error */ |
75ccf47d CM |
8036 | |
8037 | set_avail_alloc_bits(root->fs_info, cache->flags); | |
2b82032c | 8038 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
199c36ea | 8039 | set_block_group_ro(cache, 1); |
9078a3e1 | 8040 | } |
b742bb82 YZ |
8041 | |
8042 | list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { | |
8043 | if (!(get_alloc_profile(root, space_info->flags) & | |
8044 | (BTRFS_BLOCK_GROUP_RAID10 | | |
8045 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
8046 | BTRFS_BLOCK_GROUP_RAID5 | |
8047 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
8048 | BTRFS_BLOCK_GROUP_DUP))) |
8049 | continue; | |
8050 | /* | |
8051 | * avoid allocating from un-mirrored block group if there are | |
8052 | * mirrored block groups. | |
8053 | */ | |
8054 | list_for_each_entry(cache, &space_info->block_groups[3], list) | |
199c36ea | 8055 | set_block_group_ro(cache, 1); |
b742bb82 | 8056 | list_for_each_entry(cache, &space_info->block_groups[4], list) |
199c36ea | 8057 | set_block_group_ro(cache, 1); |
9078a3e1 | 8058 | } |
f0486c68 YZ |
8059 | |
8060 | init_global_block_rsv(info); | |
0b86a832 CM |
8061 | ret = 0; |
8062 | error: | |
9078a3e1 | 8063 | btrfs_free_path(path); |
0b86a832 | 8064 | return ret; |
9078a3e1 | 8065 | } |
6324fbf3 | 8066 | |
ea658bad JB |
8067 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, |
8068 | struct btrfs_root *root) | |
8069 | { | |
8070 | struct btrfs_block_group_cache *block_group, *tmp; | |
8071 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
8072 | struct btrfs_block_group_item item; | |
8073 | struct btrfs_key key; | |
8074 | int ret = 0; | |
8075 | ||
8076 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, | |
8077 | new_bg_list) { | |
8078 | list_del_init(&block_group->new_bg_list); | |
8079 | ||
8080 | if (ret) | |
8081 | continue; | |
8082 | ||
8083 | spin_lock(&block_group->lock); | |
8084 | memcpy(&item, &block_group->item, sizeof(item)); | |
8085 | memcpy(&key, &block_group->key, sizeof(key)); | |
8086 | spin_unlock(&block_group->lock); | |
8087 | ||
8088 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
8089 | sizeof(item)); | |
8090 | if (ret) | |
8091 | btrfs_abort_transaction(trans, extent_root, ret); | |
8092 | } | |
8093 | } | |
8094 | ||
6324fbf3 CM |
8095 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
8096 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 8097 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
8098 | u64 size) |
8099 | { | |
8100 | int ret; | |
6324fbf3 CM |
8101 | struct btrfs_root *extent_root; |
8102 | struct btrfs_block_group_cache *cache; | |
6324fbf3 CM |
8103 | |
8104 | extent_root = root->fs_info->extent_root; | |
6324fbf3 | 8105 | |
12fcfd22 | 8106 | root->fs_info->last_trans_log_full_commit = trans->transid; |
e02119d5 | 8107 | |
8f18cf13 | 8108 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
0f9dd46c JB |
8109 | if (!cache) |
8110 | return -ENOMEM; | |
34d52cb6 LZ |
8111 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), |
8112 | GFP_NOFS); | |
8113 | if (!cache->free_space_ctl) { | |
8114 | kfree(cache); | |
8115 | return -ENOMEM; | |
8116 | } | |
0f9dd46c | 8117 | |
e17cade2 | 8118 | cache->key.objectid = chunk_offset; |
6324fbf3 | 8119 | cache->key.offset = size; |
d2fb3437 | 8120 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
96303081 | 8121 | cache->sectorsize = root->sectorsize; |
0af3d00b | 8122 | cache->fs_info = root->fs_info; |
53b381b3 DW |
8123 | cache->full_stripe_len = btrfs_full_stripe_len(root, |
8124 | &root->fs_info->mapping_tree, | |
8125 | chunk_offset); | |
96303081 | 8126 | |
d2fb3437 | 8127 | atomic_set(&cache->count, 1); |
c286ac48 | 8128 | spin_lock_init(&cache->lock); |
0f9dd46c | 8129 | INIT_LIST_HEAD(&cache->list); |
fa9c0d79 | 8130 | INIT_LIST_HEAD(&cache->cluster_list); |
ea658bad | 8131 | INIT_LIST_HEAD(&cache->new_bg_list); |
0ef3e66b | 8132 | |
34d52cb6 LZ |
8133 | btrfs_init_free_space_ctl(cache); |
8134 | ||
6324fbf3 | 8135 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
8136 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
8137 | cache->flags = type; | |
8138 | btrfs_set_block_group_flags(&cache->item, type); | |
8139 | ||
11833d66 | 8140 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 8141 | cache->cached = BTRFS_CACHE_FINISHED; |
835d974f JB |
8142 | ret = exclude_super_stripes(root, cache); |
8143 | if (ret) { | |
8144 | /* | |
8145 | * We may have excluded something, so call this just in | |
8146 | * case. | |
8147 | */ | |
8148 | free_excluded_extents(root, cache); | |
8149 | kfree(cache->free_space_ctl); | |
8150 | kfree(cache); | |
8151 | return ret; | |
8152 | } | |
96303081 | 8153 | |
817d52f8 JB |
8154 | add_new_free_space(cache, root->fs_info, chunk_offset, |
8155 | chunk_offset + size); | |
8156 | ||
11833d66 YZ |
8157 | free_excluded_extents(root, cache); |
8158 | ||
6324fbf3 CM |
8159 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
8160 | &cache->space_info); | |
79787eaa | 8161 | BUG_ON(ret); /* -ENOMEM */ |
c7c144db | 8162 | update_global_block_rsv(root->fs_info); |
1b2da372 JB |
8163 | |
8164 | spin_lock(&cache->space_info->lock); | |
f0486c68 | 8165 | cache->space_info->bytes_readonly += cache->bytes_super; |
1b2da372 JB |
8166 | spin_unlock(&cache->space_info->lock); |
8167 | ||
b742bb82 | 8168 | __link_block_group(cache->space_info, cache); |
6324fbf3 | 8169 | |
0f9dd46c | 8170 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
79787eaa | 8171 | BUG_ON(ret); /* Logic error */ |
c286ac48 | 8172 | |
ea658bad | 8173 | list_add_tail(&cache->new_bg_list, &trans->new_bgs); |
6324fbf3 | 8174 | |
d18a2c44 | 8175 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 8176 | |
6324fbf3 CM |
8177 | return 0; |
8178 | } | |
1a40e23b | 8179 | |
10ea00f5 ID |
8180 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
8181 | { | |
899c81ea ID |
8182 | u64 extra_flags = chunk_to_extended(flags) & |
8183 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 8184 | |
de98ced9 | 8185 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8186 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
8187 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
8188 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
8189 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
8190 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
8191 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 8192 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
8193 | } |
8194 | ||
1a40e23b ZY |
8195 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
8196 | struct btrfs_root *root, u64 group_start) | |
8197 | { | |
8198 | struct btrfs_path *path; | |
8199 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 8200 | struct btrfs_free_cluster *cluster; |
0af3d00b | 8201 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
1a40e23b | 8202 | struct btrfs_key key; |
0af3d00b | 8203 | struct inode *inode; |
1a40e23b | 8204 | int ret; |
10ea00f5 | 8205 | int index; |
89a55897 | 8206 | int factor; |
1a40e23b | 8207 | |
1a40e23b ZY |
8208 | root = root->fs_info->extent_root; |
8209 | ||
8210 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); | |
8211 | BUG_ON(!block_group); | |
c146afad | 8212 | BUG_ON(!block_group->ro); |
1a40e23b | 8213 | |
9f7c43c9 | 8214 | /* |
8215 | * Free the reserved super bytes from this block group before | |
8216 | * remove it. | |
8217 | */ | |
8218 | free_excluded_extents(root, block_group); | |
8219 | ||
1a40e23b | 8220 | memcpy(&key, &block_group->key, sizeof(key)); |
10ea00f5 | 8221 | index = get_block_group_index(block_group); |
89a55897 JB |
8222 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
8223 | BTRFS_BLOCK_GROUP_RAID1 | | |
8224 | BTRFS_BLOCK_GROUP_RAID10)) | |
8225 | factor = 2; | |
8226 | else | |
8227 | factor = 1; | |
1a40e23b | 8228 | |
44fb5511 CM |
8229 | /* make sure this block group isn't part of an allocation cluster */ |
8230 | cluster = &root->fs_info->data_alloc_cluster; | |
8231 | spin_lock(&cluster->refill_lock); | |
8232 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8233 | spin_unlock(&cluster->refill_lock); | |
8234 | ||
8235 | /* | |
8236 | * make sure this block group isn't part of a metadata | |
8237 | * allocation cluster | |
8238 | */ | |
8239 | cluster = &root->fs_info->meta_alloc_cluster; | |
8240 | spin_lock(&cluster->refill_lock); | |
8241 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
8242 | spin_unlock(&cluster->refill_lock); | |
8243 | ||
1a40e23b | 8244 | path = btrfs_alloc_path(); |
d8926bb3 MF |
8245 | if (!path) { |
8246 | ret = -ENOMEM; | |
8247 | goto out; | |
8248 | } | |
1a40e23b | 8249 | |
10b2f34d | 8250 | inode = lookup_free_space_inode(tree_root, block_group, path); |
0af3d00b | 8251 | if (!IS_ERR(inode)) { |
b532402e | 8252 | ret = btrfs_orphan_add(trans, inode); |
79787eaa JM |
8253 | if (ret) { |
8254 | btrfs_add_delayed_iput(inode); | |
8255 | goto out; | |
8256 | } | |
0af3d00b JB |
8257 | clear_nlink(inode); |
8258 | /* One for the block groups ref */ | |
8259 | spin_lock(&block_group->lock); | |
8260 | if (block_group->iref) { | |
8261 | block_group->iref = 0; | |
8262 | block_group->inode = NULL; | |
8263 | spin_unlock(&block_group->lock); | |
8264 | iput(inode); | |
8265 | } else { | |
8266 | spin_unlock(&block_group->lock); | |
8267 | } | |
8268 | /* One for our lookup ref */ | |
455757c3 | 8269 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
8270 | } |
8271 | ||
8272 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
8273 | key.offset = block_group->key.objectid; | |
8274 | key.type = 0; | |
8275 | ||
8276 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
8277 | if (ret < 0) | |
8278 | goto out; | |
8279 | if (ret > 0) | |
b3b4aa74 | 8280 | btrfs_release_path(path); |
0af3d00b JB |
8281 | if (ret == 0) { |
8282 | ret = btrfs_del_item(trans, tree_root, path); | |
8283 | if (ret) | |
8284 | goto out; | |
b3b4aa74 | 8285 | btrfs_release_path(path); |
0af3d00b JB |
8286 | } |
8287 | ||
3dfdb934 | 8288 | spin_lock(&root->fs_info->block_group_cache_lock); |
1a40e23b ZY |
8289 | rb_erase(&block_group->cache_node, |
8290 | &root->fs_info->block_group_cache_tree); | |
a1897fdd LB |
8291 | |
8292 | if (root->fs_info->first_logical_byte == block_group->key.objectid) | |
8293 | root->fs_info->first_logical_byte = (u64)-1; | |
3dfdb934 | 8294 | spin_unlock(&root->fs_info->block_group_cache_lock); |
817d52f8 | 8295 | |
80eb234a | 8296 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
8297 | /* |
8298 | * we must use list_del_init so people can check to see if they | |
8299 | * are still on the list after taking the semaphore | |
8300 | */ | |
8301 | list_del_init(&block_group->list); | |
10ea00f5 ID |
8302 | if (list_empty(&block_group->space_info->block_groups[index])) |
8303 | clear_avail_alloc_bits(root->fs_info, block_group->flags); | |
80eb234a | 8304 | up_write(&block_group->space_info->groups_sem); |
1a40e23b | 8305 | |
817d52f8 | 8306 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 8307 | wait_block_group_cache_done(block_group); |
817d52f8 JB |
8308 | |
8309 | btrfs_remove_free_space_cache(block_group); | |
8310 | ||
c146afad YZ |
8311 | spin_lock(&block_group->space_info->lock); |
8312 | block_group->space_info->total_bytes -= block_group->key.offset; | |
8313 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 8314 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
c146afad | 8315 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 8316 | |
0af3d00b JB |
8317 | memcpy(&key, &block_group->key, sizeof(key)); |
8318 | ||
283bb197 | 8319 | btrfs_clear_space_info_full(root->fs_info); |
c146afad | 8320 | |
fa9c0d79 CM |
8321 | btrfs_put_block_group(block_group); |
8322 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
8323 | |
8324 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
8325 | if (ret > 0) | |
8326 | ret = -EIO; | |
8327 | if (ret < 0) | |
8328 | goto out; | |
8329 | ||
8330 | ret = btrfs_del_item(trans, root, path); | |
8331 | out: | |
8332 | btrfs_free_path(path); | |
8333 | return ret; | |
8334 | } | |
acce952b | 8335 | |
c59021f8 | 8336 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
8337 | { | |
8338 | struct btrfs_space_info *space_info; | |
1aba86d6 | 8339 | struct btrfs_super_block *disk_super; |
8340 | u64 features; | |
8341 | u64 flags; | |
8342 | int mixed = 0; | |
c59021f8 | 8343 | int ret; |
8344 | ||
6c41761f | 8345 | disk_super = fs_info->super_copy; |
1aba86d6 | 8346 | if (!btrfs_super_root(disk_super)) |
8347 | return 1; | |
c59021f8 | 8348 | |
1aba86d6 | 8349 | features = btrfs_super_incompat_flags(disk_super); |
8350 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
8351 | mixed = 1; | |
c59021f8 | 8352 | |
1aba86d6 | 8353 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
8354 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
c59021f8 | 8355 | if (ret) |
1aba86d6 | 8356 | goto out; |
c59021f8 | 8357 | |
1aba86d6 | 8358 | if (mixed) { |
8359 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
8360 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8361 | } else { | |
8362 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
8363 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8364 | if (ret) | |
8365 | goto out; | |
8366 | ||
8367 | flags = BTRFS_BLOCK_GROUP_DATA; | |
8368 | ret = update_space_info(fs_info, flags, 0, 0, &space_info); | |
8369 | } | |
8370 | out: | |
c59021f8 | 8371 | return ret; |
8372 | } | |
8373 | ||
acce952b | 8374 | int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end) |
8375 | { | |
8376 | return unpin_extent_range(root, start, end); | |
8377 | } | |
8378 | ||
8379 | int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, | |
5378e607 | 8380 | u64 num_bytes, u64 *actual_bytes) |
acce952b | 8381 | { |
5378e607 | 8382 | return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes); |
acce952b | 8383 | } |
f7039b1d LD |
8384 | |
8385 | int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) | |
8386 | { | |
8387 | struct btrfs_fs_info *fs_info = root->fs_info; | |
8388 | struct btrfs_block_group_cache *cache = NULL; | |
8389 | u64 group_trimmed; | |
8390 | u64 start; | |
8391 | u64 end; | |
8392 | u64 trimmed = 0; | |
2cac13e4 | 8393 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
8394 | int ret = 0; |
8395 | ||
2cac13e4 LB |
8396 | /* |
8397 | * try to trim all FS space, our block group may start from non-zero. | |
8398 | */ | |
8399 | if (range->len == total_bytes) | |
8400 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
8401 | else | |
8402 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
8403 | |
8404 | while (cache) { | |
8405 | if (cache->key.objectid >= (range->start + range->len)) { | |
8406 | btrfs_put_block_group(cache); | |
8407 | break; | |
8408 | } | |
8409 | ||
8410 | start = max(range->start, cache->key.objectid); | |
8411 | end = min(range->start + range->len, | |
8412 | cache->key.objectid + cache->key.offset); | |
8413 | ||
8414 | if (end - start >= range->minlen) { | |
8415 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 8416 | ret = cache_block_group(cache, 0); |
f7039b1d LD |
8417 | if (!ret) |
8418 | wait_block_group_cache_done(cache); | |
8419 | } | |
8420 | ret = btrfs_trim_block_group(cache, | |
8421 | &group_trimmed, | |
8422 | start, | |
8423 | end, | |
8424 | range->minlen); | |
8425 | ||
8426 | trimmed += group_trimmed; | |
8427 | if (ret) { | |
8428 | btrfs_put_block_group(cache); | |
8429 | break; | |
8430 | } | |
8431 | } | |
8432 | ||
8433 | cache = next_block_group(fs_info->tree_root, cache); | |
8434 | } | |
8435 | ||
8436 | range->len = trimmed; | |
8437 | return ret; | |
8438 | } |