Commit | Line | Data |
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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 | 4 | */ |
c1d7c514 | 5 | |
ec6b910f | 6 | #include <linux/sched.h> |
f361bf4a | 7 | #include <linux/sched/signal.h> |
edbd8d4e | 8 | #include <linux/pagemap.h> |
ec44a35c | 9 | #include <linux/writeback.h> |
21af804c | 10 | #include <linux/blkdev.h> |
b7a9f29f | 11 | #include <linux/sort.h> |
4184ea7f | 12 | #include <linux/rcupdate.h> |
817d52f8 | 13 | #include <linux/kthread.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
dff51cd1 | 15 | #include <linux/ratelimit.h> |
b150a4f1 | 16 | #include <linux/percpu_counter.h> |
69fe2d75 | 17 | #include <linux/lockdep.h> |
9678c543 | 18 | #include <linux/crc32c.h> |
995946dd | 19 | #include "tree-log.h" |
fec577fb CM |
20 | #include "disk-io.h" |
21 | #include "print-tree.h" | |
0b86a832 | 22 | #include "volumes.h" |
53b381b3 | 23 | #include "raid56.h" |
925baedd | 24 | #include "locking.h" |
fa9c0d79 | 25 | #include "free-space-cache.h" |
1e144fb8 | 26 | #include "free-space-tree.h" |
3fed40cc | 27 | #include "math.h" |
6ab0a202 | 28 | #include "sysfs.h" |
fcebe456 | 29 | #include "qgroup.h" |
fd708b81 | 30 | #include "ref-verify.h" |
fec577fb | 31 | |
709c0486 AJ |
32 | #undef SCRAMBLE_DELAYED_REFS |
33 | ||
9e622d6b MX |
34 | /* |
35 | * control flags for do_chunk_alloc's force field | |
0e4f8f88 CM |
36 | * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk |
37 | * if we really need one. | |
38 | * | |
0e4f8f88 CM |
39 | * CHUNK_ALLOC_LIMITED means to only try and allocate one |
40 | * if we have very few chunks already allocated. This is | |
41 | * used as part of the clustering code to help make sure | |
42 | * we have a good pool of storage to cluster in, without | |
43 | * filling the FS with empty chunks | |
44 | * | |
9e622d6b MX |
45 | * CHUNK_ALLOC_FORCE means it must try to allocate one |
46 | * | |
0e4f8f88 CM |
47 | */ |
48 | enum { | |
49 | CHUNK_ALLOC_NO_FORCE = 0, | |
9e622d6b MX |
50 | CHUNK_ALLOC_LIMITED = 1, |
51 | CHUNK_ALLOC_FORCE = 2, | |
0e4f8f88 CM |
52 | }; |
53 | ||
5d4f98a2 | 54 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
2ff7e61e | 55 | struct btrfs_fs_info *fs_info, |
c682f9b3 | 56 | struct btrfs_delayed_ref_node *node, u64 parent, |
5d4f98a2 YZ |
57 | u64 root_objectid, u64 owner_objectid, |
58 | u64 owner_offset, int refs_to_drop, | |
c682f9b3 | 59 | struct btrfs_delayed_extent_op *extra_op); |
5d4f98a2 YZ |
60 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, |
61 | struct extent_buffer *leaf, | |
62 | struct btrfs_extent_item *ei); | |
63 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
2ff7e61e | 64 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
65 | u64 parent, u64 root_objectid, |
66 | u64 flags, u64 owner, u64 offset, | |
67 | struct btrfs_key *ins, int ref_mod); | |
68 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, | |
4e6bd4e0 | 69 | struct btrfs_delayed_ref_node *node, |
21ebfbe7 | 70 | struct btrfs_delayed_extent_op *extent_op); |
6a63209f | 71 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
2ff7e61e | 72 | struct btrfs_fs_info *fs_info, u64 flags, |
698d0082 | 73 | int force); |
11833d66 YZ |
74 | static int find_next_key(struct btrfs_path *path, int level, |
75 | struct btrfs_key *key); | |
ab8d0fc4 JM |
76 | static void dump_space_info(struct btrfs_fs_info *fs_info, |
77 | struct btrfs_space_info *info, u64 bytes, | |
9ed74f2d | 78 | int dump_block_groups); |
5d80366e JB |
79 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, |
80 | u64 num_bytes); | |
957780eb JB |
81 | static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, |
82 | struct btrfs_space_info *space_info, | |
83 | u64 num_bytes); | |
84 | static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info, | |
85 | struct btrfs_space_info *space_info, | |
86 | u64 num_bytes); | |
6a63209f | 87 | |
817d52f8 JB |
88 | static noinline int |
89 | block_group_cache_done(struct btrfs_block_group_cache *cache) | |
90 | { | |
91 | smp_mb(); | |
36cce922 JB |
92 | return cache->cached == BTRFS_CACHE_FINISHED || |
93 | cache->cached == BTRFS_CACHE_ERROR; | |
817d52f8 JB |
94 | } |
95 | ||
0f9dd46c JB |
96 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
97 | { | |
98 | return (cache->flags & bits) == bits; | |
99 | } | |
100 | ||
758f2dfc | 101 | void btrfs_get_block_group(struct btrfs_block_group_cache *cache) |
11dfe35a JB |
102 | { |
103 | atomic_inc(&cache->count); | |
104 | } | |
105 | ||
106 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache) | |
107 | { | |
f0486c68 YZ |
108 | if (atomic_dec_and_test(&cache->count)) { |
109 | WARN_ON(cache->pinned > 0); | |
110 | WARN_ON(cache->reserved > 0); | |
0966a7b1 QW |
111 | |
112 | /* | |
113 | * If not empty, someone is still holding mutex of | |
114 | * full_stripe_lock, which can only be released by caller. | |
115 | * And it will definitely cause use-after-free when caller | |
116 | * tries to release full stripe lock. | |
117 | * | |
118 | * No better way to resolve, but only to warn. | |
119 | */ | |
120 | WARN_ON(!RB_EMPTY_ROOT(&cache->full_stripe_locks_root.root)); | |
34d52cb6 | 121 | kfree(cache->free_space_ctl); |
11dfe35a | 122 | kfree(cache); |
f0486c68 | 123 | } |
11dfe35a JB |
124 | } |
125 | ||
0f9dd46c JB |
126 | /* |
127 | * this adds the block group to the fs_info rb tree for the block group | |
128 | * cache | |
129 | */ | |
b2950863 | 130 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
0f9dd46c JB |
131 | struct btrfs_block_group_cache *block_group) |
132 | { | |
133 | struct rb_node **p; | |
134 | struct rb_node *parent = NULL; | |
135 | struct btrfs_block_group_cache *cache; | |
136 | ||
137 | spin_lock(&info->block_group_cache_lock); | |
138 | p = &info->block_group_cache_tree.rb_node; | |
139 | ||
140 | while (*p) { | |
141 | parent = *p; | |
142 | cache = rb_entry(parent, struct btrfs_block_group_cache, | |
143 | cache_node); | |
144 | if (block_group->key.objectid < cache->key.objectid) { | |
145 | p = &(*p)->rb_left; | |
146 | } else if (block_group->key.objectid > cache->key.objectid) { | |
147 | p = &(*p)->rb_right; | |
148 | } else { | |
149 | spin_unlock(&info->block_group_cache_lock); | |
150 | return -EEXIST; | |
151 | } | |
152 | } | |
153 | ||
154 | rb_link_node(&block_group->cache_node, parent, p); | |
155 | rb_insert_color(&block_group->cache_node, | |
156 | &info->block_group_cache_tree); | |
a1897fdd LB |
157 | |
158 | if (info->first_logical_byte > block_group->key.objectid) | |
159 | info->first_logical_byte = block_group->key.objectid; | |
160 | ||
0f9dd46c JB |
161 | spin_unlock(&info->block_group_cache_lock); |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /* | |
167 | * This will return the block group at or after bytenr if contains is 0, else | |
168 | * it will return the block group that contains the bytenr | |
169 | */ | |
170 | static struct btrfs_block_group_cache * | |
171 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, | |
172 | int contains) | |
173 | { | |
174 | struct btrfs_block_group_cache *cache, *ret = NULL; | |
175 | struct rb_node *n; | |
176 | u64 end, start; | |
177 | ||
178 | spin_lock(&info->block_group_cache_lock); | |
179 | n = info->block_group_cache_tree.rb_node; | |
180 | ||
181 | while (n) { | |
182 | cache = rb_entry(n, struct btrfs_block_group_cache, | |
183 | cache_node); | |
184 | end = cache->key.objectid + cache->key.offset - 1; | |
185 | start = cache->key.objectid; | |
186 | ||
187 | if (bytenr < start) { | |
188 | if (!contains && (!ret || start < ret->key.objectid)) | |
189 | ret = cache; | |
190 | n = n->rb_left; | |
191 | } else if (bytenr > start) { | |
192 | if (contains && bytenr <= end) { | |
193 | ret = cache; | |
194 | break; | |
195 | } | |
196 | n = n->rb_right; | |
197 | } else { | |
198 | ret = cache; | |
199 | break; | |
200 | } | |
201 | } | |
a1897fdd | 202 | if (ret) { |
11dfe35a | 203 | btrfs_get_block_group(ret); |
a1897fdd LB |
204 | if (bytenr == 0 && info->first_logical_byte > ret->key.objectid) |
205 | info->first_logical_byte = ret->key.objectid; | |
206 | } | |
0f9dd46c JB |
207 | spin_unlock(&info->block_group_cache_lock); |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
2ff7e61e | 212 | static int add_excluded_extent(struct btrfs_fs_info *fs_info, |
11833d66 | 213 | u64 start, u64 num_bytes) |
817d52f8 | 214 | { |
11833d66 | 215 | u64 end = start + num_bytes - 1; |
0b246afa | 216 | set_extent_bits(&fs_info->freed_extents[0], |
ceeb0ae7 | 217 | start, end, EXTENT_UPTODATE); |
0b246afa | 218 | set_extent_bits(&fs_info->freed_extents[1], |
ceeb0ae7 | 219 | start, end, EXTENT_UPTODATE); |
11833d66 YZ |
220 | return 0; |
221 | } | |
817d52f8 | 222 | |
2ff7e61e | 223 | static void free_excluded_extents(struct btrfs_fs_info *fs_info, |
11833d66 YZ |
224 | struct btrfs_block_group_cache *cache) |
225 | { | |
226 | u64 start, end; | |
817d52f8 | 227 | |
11833d66 YZ |
228 | start = cache->key.objectid; |
229 | end = start + cache->key.offset - 1; | |
230 | ||
0b246afa | 231 | clear_extent_bits(&fs_info->freed_extents[0], |
91166212 | 232 | start, end, EXTENT_UPTODATE); |
0b246afa | 233 | clear_extent_bits(&fs_info->freed_extents[1], |
91166212 | 234 | start, end, EXTENT_UPTODATE); |
817d52f8 JB |
235 | } |
236 | ||
2ff7e61e | 237 | static int exclude_super_stripes(struct btrfs_fs_info *fs_info, |
11833d66 | 238 | struct btrfs_block_group_cache *cache) |
817d52f8 | 239 | { |
817d52f8 JB |
240 | u64 bytenr; |
241 | u64 *logical; | |
242 | int stripe_len; | |
243 | int i, nr, ret; | |
244 | ||
06b2331f YZ |
245 | if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) { |
246 | stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid; | |
247 | cache->bytes_super += stripe_len; | |
2ff7e61e | 248 | ret = add_excluded_extent(fs_info, cache->key.objectid, |
06b2331f | 249 | stripe_len); |
835d974f JB |
250 | if (ret) |
251 | return ret; | |
06b2331f YZ |
252 | } |
253 | ||
817d52f8 JB |
254 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
255 | bytenr = btrfs_sb_offset(i); | |
0b246afa | 256 | ret = btrfs_rmap_block(fs_info, cache->key.objectid, |
63a9c7b9 | 257 | bytenr, &logical, &nr, &stripe_len); |
835d974f JB |
258 | if (ret) |
259 | return ret; | |
11833d66 | 260 | |
817d52f8 | 261 | while (nr--) { |
51bf5f0b JB |
262 | u64 start, len; |
263 | ||
264 | if (logical[nr] > cache->key.objectid + | |
265 | cache->key.offset) | |
266 | continue; | |
267 | ||
268 | if (logical[nr] + stripe_len <= cache->key.objectid) | |
269 | continue; | |
270 | ||
271 | start = logical[nr]; | |
272 | if (start < cache->key.objectid) { | |
273 | start = cache->key.objectid; | |
274 | len = (logical[nr] + stripe_len) - start; | |
275 | } else { | |
276 | len = min_t(u64, stripe_len, | |
277 | cache->key.objectid + | |
278 | cache->key.offset - start); | |
279 | } | |
280 | ||
281 | cache->bytes_super += len; | |
2ff7e61e | 282 | ret = add_excluded_extent(fs_info, start, len); |
835d974f JB |
283 | if (ret) { |
284 | kfree(logical); | |
285 | return ret; | |
286 | } | |
817d52f8 | 287 | } |
11833d66 | 288 | |
817d52f8 JB |
289 | kfree(logical); |
290 | } | |
817d52f8 JB |
291 | return 0; |
292 | } | |
293 | ||
11833d66 YZ |
294 | static struct btrfs_caching_control * |
295 | get_caching_control(struct btrfs_block_group_cache *cache) | |
296 | { | |
297 | struct btrfs_caching_control *ctl; | |
298 | ||
299 | spin_lock(&cache->lock); | |
dde5abee JB |
300 | if (!cache->caching_ctl) { |
301 | spin_unlock(&cache->lock); | |
11833d66 YZ |
302 | return NULL; |
303 | } | |
304 | ||
305 | ctl = cache->caching_ctl; | |
1e4f4714 | 306 | refcount_inc(&ctl->count); |
11833d66 YZ |
307 | spin_unlock(&cache->lock); |
308 | return ctl; | |
309 | } | |
310 | ||
311 | static void put_caching_control(struct btrfs_caching_control *ctl) | |
312 | { | |
1e4f4714 | 313 | if (refcount_dec_and_test(&ctl->count)) |
11833d66 YZ |
314 | kfree(ctl); |
315 | } | |
316 | ||
d0bd4560 | 317 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 318 | static void fragment_free_space(struct btrfs_block_group_cache *block_group) |
d0bd4560 | 319 | { |
2ff7e61e | 320 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
d0bd4560 JB |
321 | u64 start = block_group->key.objectid; |
322 | u64 len = block_group->key.offset; | |
323 | u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ? | |
0b246afa | 324 | fs_info->nodesize : fs_info->sectorsize; |
d0bd4560 JB |
325 | u64 step = chunk << 1; |
326 | ||
327 | while (len > chunk) { | |
328 | btrfs_remove_free_space(block_group, start, chunk); | |
329 | start += step; | |
330 | if (len < step) | |
331 | len = 0; | |
332 | else | |
333 | len -= step; | |
334 | } | |
335 | } | |
336 | #endif | |
337 | ||
0f9dd46c JB |
338 | /* |
339 | * this is only called by cache_block_group, since we could have freed extents | |
340 | * we need to check the pinned_extents for any extents that can't be used yet | |
341 | * since their free space will be released as soon as the transaction commits. | |
342 | */ | |
a5ed9182 | 343 | u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
4457c1c7 | 344 | u64 start, u64 end) |
0f9dd46c | 345 | { |
4457c1c7 | 346 | struct btrfs_fs_info *info = block_group->fs_info; |
817d52f8 | 347 | u64 extent_start, extent_end, size, total_added = 0; |
0f9dd46c JB |
348 | int ret; |
349 | ||
350 | while (start < end) { | |
11833d66 | 351 | ret = find_first_extent_bit(info->pinned_extents, start, |
0f9dd46c | 352 | &extent_start, &extent_end, |
e6138876 JB |
353 | EXTENT_DIRTY | EXTENT_UPTODATE, |
354 | NULL); | |
0f9dd46c JB |
355 | if (ret) |
356 | break; | |
357 | ||
06b2331f | 358 | if (extent_start <= start) { |
0f9dd46c JB |
359 | start = extent_end + 1; |
360 | } else if (extent_start > start && extent_start < end) { | |
361 | size = extent_start - start; | |
817d52f8 | 362 | total_added += size; |
ea6a478e JB |
363 | ret = btrfs_add_free_space(block_group, start, |
364 | size); | |
79787eaa | 365 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
366 | start = extent_end + 1; |
367 | } else { | |
368 | break; | |
369 | } | |
370 | } | |
371 | ||
372 | if (start < end) { | |
373 | size = end - start; | |
817d52f8 | 374 | total_added += size; |
ea6a478e | 375 | ret = btrfs_add_free_space(block_group, start, size); |
79787eaa | 376 | BUG_ON(ret); /* -ENOMEM or logic error */ |
0f9dd46c JB |
377 | } |
378 | ||
817d52f8 | 379 | return total_added; |
0f9dd46c JB |
380 | } |
381 | ||
73fa48b6 | 382 | static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl) |
e37c9e69 | 383 | { |
0b246afa JM |
384 | struct btrfs_block_group_cache *block_group = caching_ctl->block_group; |
385 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
386 | struct btrfs_root *extent_root = fs_info->extent_root; | |
e37c9e69 | 387 | struct btrfs_path *path; |
5f39d397 | 388 | struct extent_buffer *leaf; |
11833d66 | 389 | struct btrfs_key key; |
817d52f8 | 390 | u64 total_found = 0; |
11833d66 YZ |
391 | u64 last = 0; |
392 | u32 nritems; | |
73fa48b6 | 393 | int ret; |
d0bd4560 | 394 | bool wakeup = true; |
f510cfec | 395 | |
e37c9e69 CM |
396 | path = btrfs_alloc_path(); |
397 | if (!path) | |
73fa48b6 | 398 | return -ENOMEM; |
7d7d6068 | 399 | |
817d52f8 | 400 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
11833d66 | 401 | |
d0bd4560 JB |
402 | #ifdef CONFIG_BTRFS_DEBUG |
403 | /* | |
404 | * If we're fragmenting we don't want to make anybody think we can | |
405 | * allocate from this block group until we've had a chance to fragment | |
406 | * the free space. | |
407 | */ | |
2ff7e61e | 408 | if (btrfs_should_fragment_free_space(block_group)) |
d0bd4560 JB |
409 | wakeup = false; |
410 | #endif | |
5cd57b2c | 411 | /* |
817d52f8 JB |
412 | * We don't want to deadlock with somebody trying to allocate a new |
413 | * extent for the extent root while also trying to search the extent | |
414 | * root to add free space. So we skip locking and search the commit | |
415 | * root, since its read-only | |
5cd57b2c CM |
416 | */ |
417 | path->skip_locking = 1; | |
817d52f8 | 418 | path->search_commit_root = 1; |
e4058b54 | 419 | path->reada = READA_FORWARD; |
817d52f8 | 420 | |
e4404d6e | 421 | key.objectid = last; |
e37c9e69 | 422 | key.offset = 0; |
11833d66 | 423 | key.type = BTRFS_EXTENT_ITEM_KEY; |
013f1b12 | 424 | |
52ee28d2 | 425 | next: |
11833d66 | 426 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
e37c9e69 | 427 | if (ret < 0) |
73fa48b6 | 428 | goto out; |
a512bbf8 | 429 | |
11833d66 YZ |
430 | leaf = path->nodes[0]; |
431 | nritems = btrfs_header_nritems(leaf); | |
432 | ||
d397712b | 433 | while (1) { |
7841cb28 | 434 | if (btrfs_fs_closing(fs_info) > 1) { |
f25784b3 | 435 | last = (u64)-1; |
817d52f8 | 436 | break; |
f25784b3 | 437 | } |
817d52f8 | 438 | |
11833d66 YZ |
439 | if (path->slots[0] < nritems) { |
440 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
441 | } else { | |
442 | ret = find_next_key(path, 0, &key); | |
443 | if (ret) | |
e37c9e69 | 444 | break; |
817d52f8 | 445 | |
c9ea7b24 | 446 | if (need_resched() || |
9e351cc8 | 447 | rwsem_is_contended(&fs_info->commit_root_sem)) { |
d0bd4560 JB |
448 | if (wakeup) |
449 | caching_ctl->progress = last; | |
ff5714cc | 450 | btrfs_release_path(path); |
9e351cc8 | 451 | up_read(&fs_info->commit_root_sem); |
589d8ade | 452 | mutex_unlock(&caching_ctl->mutex); |
11833d66 | 453 | cond_resched(); |
73fa48b6 OS |
454 | mutex_lock(&caching_ctl->mutex); |
455 | down_read(&fs_info->commit_root_sem); | |
456 | goto next; | |
589d8ade | 457 | } |
0a3896d0 JB |
458 | |
459 | ret = btrfs_next_leaf(extent_root, path); | |
460 | if (ret < 0) | |
73fa48b6 | 461 | goto out; |
0a3896d0 JB |
462 | if (ret) |
463 | break; | |
589d8ade JB |
464 | leaf = path->nodes[0]; |
465 | nritems = btrfs_header_nritems(leaf); | |
466 | continue; | |
11833d66 | 467 | } |
817d52f8 | 468 | |
52ee28d2 LB |
469 | if (key.objectid < last) { |
470 | key.objectid = last; | |
471 | key.offset = 0; | |
472 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
473 | ||
d0bd4560 JB |
474 | if (wakeup) |
475 | caching_ctl->progress = last; | |
52ee28d2 LB |
476 | btrfs_release_path(path); |
477 | goto next; | |
478 | } | |
479 | ||
11833d66 YZ |
480 | if (key.objectid < block_group->key.objectid) { |
481 | path->slots[0]++; | |
817d52f8 | 482 | continue; |
e37c9e69 | 483 | } |
0f9dd46c | 484 | |
e37c9e69 | 485 | if (key.objectid >= block_group->key.objectid + |
0f9dd46c | 486 | block_group->key.offset) |
e37c9e69 | 487 | break; |
7d7d6068 | 488 | |
3173a18f JB |
489 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
490 | key.type == BTRFS_METADATA_ITEM_KEY) { | |
4457c1c7 | 491 | total_found += add_new_free_space(block_group, last, |
817d52f8 | 492 | key.objectid); |
3173a18f JB |
493 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
494 | last = key.objectid + | |
da17066c | 495 | fs_info->nodesize; |
3173a18f JB |
496 | else |
497 | last = key.objectid + key.offset; | |
817d52f8 | 498 | |
73fa48b6 | 499 | if (total_found > CACHING_CTL_WAKE_UP) { |
11833d66 | 500 | total_found = 0; |
d0bd4560 JB |
501 | if (wakeup) |
502 | wake_up(&caching_ctl->wait); | |
11833d66 | 503 | } |
817d52f8 | 504 | } |
e37c9e69 CM |
505 | path->slots[0]++; |
506 | } | |
817d52f8 | 507 | ret = 0; |
e37c9e69 | 508 | |
4457c1c7 | 509 | total_found += add_new_free_space(block_group, last, |
817d52f8 JB |
510 | block_group->key.objectid + |
511 | block_group->key.offset); | |
11833d66 | 512 | caching_ctl->progress = (u64)-1; |
817d52f8 | 513 | |
73fa48b6 OS |
514 | out: |
515 | btrfs_free_path(path); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | static noinline void caching_thread(struct btrfs_work *work) | |
520 | { | |
521 | struct btrfs_block_group_cache *block_group; | |
522 | struct btrfs_fs_info *fs_info; | |
523 | struct btrfs_caching_control *caching_ctl; | |
524 | int ret; | |
525 | ||
526 | caching_ctl = container_of(work, struct btrfs_caching_control, work); | |
527 | block_group = caching_ctl->block_group; | |
528 | fs_info = block_group->fs_info; | |
529 | ||
530 | mutex_lock(&caching_ctl->mutex); | |
531 | down_read(&fs_info->commit_root_sem); | |
532 | ||
1e144fb8 OS |
533 | if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) |
534 | ret = load_free_space_tree(caching_ctl); | |
535 | else | |
536 | ret = load_extent_tree_free(caching_ctl); | |
73fa48b6 | 537 | |
817d52f8 | 538 | spin_lock(&block_group->lock); |
11833d66 | 539 | block_group->caching_ctl = NULL; |
73fa48b6 | 540 | block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED; |
817d52f8 | 541 | spin_unlock(&block_group->lock); |
0f9dd46c | 542 | |
d0bd4560 | 543 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 544 | if (btrfs_should_fragment_free_space(block_group)) { |
d0bd4560 JB |
545 | u64 bytes_used; |
546 | ||
547 | spin_lock(&block_group->space_info->lock); | |
548 | spin_lock(&block_group->lock); | |
549 | bytes_used = block_group->key.offset - | |
550 | btrfs_block_group_used(&block_group->item); | |
551 | block_group->space_info->bytes_used += bytes_used >> 1; | |
552 | spin_unlock(&block_group->lock); | |
553 | spin_unlock(&block_group->space_info->lock); | |
2ff7e61e | 554 | fragment_free_space(block_group); |
d0bd4560 JB |
555 | } |
556 | #endif | |
557 | ||
558 | caching_ctl->progress = (u64)-1; | |
11833d66 | 559 | |
9e351cc8 | 560 | up_read(&fs_info->commit_root_sem); |
2ff7e61e | 561 | free_excluded_extents(fs_info, block_group); |
11833d66 | 562 | mutex_unlock(&caching_ctl->mutex); |
73fa48b6 | 563 | |
11833d66 YZ |
564 | wake_up(&caching_ctl->wait); |
565 | ||
566 | put_caching_control(caching_ctl); | |
11dfe35a | 567 | btrfs_put_block_group(block_group); |
817d52f8 JB |
568 | } |
569 | ||
9d66e233 | 570 | static int cache_block_group(struct btrfs_block_group_cache *cache, |
9d66e233 | 571 | int load_cache_only) |
817d52f8 | 572 | { |
291c7d2f | 573 | DEFINE_WAIT(wait); |
11833d66 YZ |
574 | struct btrfs_fs_info *fs_info = cache->fs_info; |
575 | struct btrfs_caching_control *caching_ctl; | |
817d52f8 JB |
576 | int ret = 0; |
577 | ||
291c7d2f | 578 | caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); |
79787eaa JM |
579 | if (!caching_ctl) |
580 | return -ENOMEM; | |
291c7d2f JB |
581 | |
582 | INIT_LIST_HEAD(&caching_ctl->list); | |
583 | mutex_init(&caching_ctl->mutex); | |
584 | init_waitqueue_head(&caching_ctl->wait); | |
585 | caching_ctl->block_group = cache; | |
586 | caching_ctl->progress = cache->key.objectid; | |
1e4f4714 | 587 | refcount_set(&caching_ctl->count, 1); |
9e0af237 LB |
588 | btrfs_init_work(&caching_ctl->work, btrfs_cache_helper, |
589 | caching_thread, NULL, NULL); | |
291c7d2f JB |
590 | |
591 | spin_lock(&cache->lock); | |
592 | /* | |
593 | * This should be a rare occasion, but this could happen I think in the | |
594 | * case where one thread starts to load the space cache info, and then | |
595 | * some other thread starts a transaction commit which tries to do an | |
596 | * allocation while the other thread is still loading the space cache | |
597 | * info. The previous loop should have kept us from choosing this block | |
598 | * group, but if we've moved to the state where we will wait on caching | |
599 | * block groups we need to first check if we're doing a fast load here, | |
600 | * so we can wait for it to finish, otherwise we could end up allocating | |
601 | * from a block group who's cache gets evicted for one reason or | |
602 | * another. | |
603 | */ | |
604 | while (cache->cached == BTRFS_CACHE_FAST) { | |
605 | struct btrfs_caching_control *ctl; | |
606 | ||
607 | ctl = cache->caching_ctl; | |
1e4f4714 | 608 | refcount_inc(&ctl->count); |
291c7d2f JB |
609 | prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE); |
610 | spin_unlock(&cache->lock); | |
611 | ||
612 | schedule(); | |
613 | ||
614 | finish_wait(&ctl->wait, &wait); | |
615 | put_caching_control(ctl); | |
616 | spin_lock(&cache->lock); | |
617 | } | |
618 | ||
619 | if (cache->cached != BTRFS_CACHE_NO) { | |
620 | spin_unlock(&cache->lock); | |
621 | kfree(caching_ctl); | |
11833d66 | 622 | return 0; |
291c7d2f JB |
623 | } |
624 | WARN_ON(cache->caching_ctl); | |
625 | cache->caching_ctl = caching_ctl; | |
626 | cache->cached = BTRFS_CACHE_FAST; | |
627 | spin_unlock(&cache->lock); | |
11833d66 | 628 | |
d8953d69 | 629 | if (btrfs_test_opt(fs_info, SPACE_CACHE)) { |
cb83b7b8 | 630 | mutex_lock(&caching_ctl->mutex); |
9d66e233 JB |
631 | ret = load_free_space_cache(fs_info, cache); |
632 | ||
633 | spin_lock(&cache->lock); | |
634 | if (ret == 1) { | |
291c7d2f | 635 | cache->caching_ctl = NULL; |
9d66e233 JB |
636 | cache->cached = BTRFS_CACHE_FINISHED; |
637 | cache->last_byte_to_unpin = (u64)-1; | |
cb83b7b8 | 638 | caching_ctl->progress = (u64)-1; |
9d66e233 | 639 | } else { |
291c7d2f JB |
640 | if (load_cache_only) { |
641 | cache->caching_ctl = NULL; | |
642 | cache->cached = BTRFS_CACHE_NO; | |
643 | } else { | |
644 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 645 | cache->has_caching_ctl = 1; |
291c7d2f | 646 | } |
9d66e233 JB |
647 | } |
648 | spin_unlock(&cache->lock); | |
d0bd4560 JB |
649 | #ifdef CONFIG_BTRFS_DEBUG |
650 | if (ret == 1 && | |
2ff7e61e | 651 | btrfs_should_fragment_free_space(cache)) { |
d0bd4560 JB |
652 | u64 bytes_used; |
653 | ||
654 | spin_lock(&cache->space_info->lock); | |
655 | spin_lock(&cache->lock); | |
656 | bytes_used = cache->key.offset - | |
657 | btrfs_block_group_used(&cache->item); | |
658 | cache->space_info->bytes_used += bytes_used >> 1; | |
659 | spin_unlock(&cache->lock); | |
660 | spin_unlock(&cache->space_info->lock); | |
2ff7e61e | 661 | fragment_free_space(cache); |
d0bd4560 JB |
662 | } |
663 | #endif | |
cb83b7b8 JB |
664 | mutex_unlock(&caching_ctl->mutex); |
665 | ||
291c7d2f | 666 | wake_up(&caching_ctl->wait); |
3c14874a | 667 | if (ret == 1) { |
291c7d2f | 668 | put_caching_control(caching_ctl); |
2ff7e61e | 669 | free_excluded_extents(fs_info, cache); |
9d66e233 | 670 | return 0; |
3c14874a | 671 | } |
291c7d2f JB |
672 | } else { |
673 | /* | |
1e144fb8 OS |
674 | * We're either using the free space tree or no caching at all. |
675 | * Set cached to the appropriate value and wakeup any waiters. | |
291c7d2f JB |
676 | */ |
677 | spin_lock(&cache->lock); | |
678 | if (load_cache_only) { | |
679 | cache->caching_ctl = NULL; | |
680 | cache->cached = BTRFS_CACHE_NO; | |
681 | } else { | |
682 | cache->cached = BTRFS_CACHE_STARTED; | |
4f69cb98 | 683 | cache->has_caching_ctl = 1; |
291c7d2f JB |
684 | } |
685 | spin_unlock(&cache->lock); | |
686 | wake_up(&caching_ctl->wait); | |
9d66e233 JB |
687 | } |
688 | ||
291c7d2f JB |
689 | if (load_cache_only) { |
690 | put_caching_control(caching_ctl); | |
11833d66 | 691 | return 0; |
817d52f8 | 692 | } |
817d52f8 | 693 | |
9e351cc8 | 694 | down_write(&fs_info->commit_root_sem); |
1e4f4714 | 695 | refcount_inc(&caching_ctl->count); |
11833d66 | 696 | list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); |
9e351cc8 | 697 | up_write(&fs_info->commit_root_sem); |
11833d66 | 698 | |
11dfe35a | 699 | btrfs_get_block_group(cache); |
11833d66 | 700 | |
e66f0bb1 | 701 | btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); |
817d52f8 | 702 | |
ef8bbdfe | 703 | return ret; |
e37c9e69 CM |
704 | } |
705 | ||
0f9dd46c JB |
706 | /* |
707 | * return the block group that starts at or after bytenr | |
708 | */ | |
d397712b CM |
709 | static struct btrfs_block_group_cache * |
710 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) | |
0ef3e66b | 711 | { |
e2c89907 | 712 | return block_group_cache_tree_search(info, bytenr, 0); |
0ef3e66b CM |
713 | } |
714 | ||
0f9dd46c | 715 | /* |
9f55684c | 716 | * return the block group that contains the given bytenr |
0f9dd46c | 717 | */ |
d397712b CM |
718 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
719 | struct btrfs_fs_info *info, | |
720 | u64 bytenr) | |
be744175 | 721 | { |
e2c89907 | 722 | return block_group_cache_tree_search(info, bytenr, 1); |
be744175 | 723 | } |
0b86a832 | 724 | |
0f9dd46c JB |
725 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
726 | u64 flags) | |
6324fbf3 | 727 | { |
0f9dd46c | 728 | struct list_head *head = &info->space_info; |
0f9dd46c | 729 | struct btrfs_space_info *found; |
4184ea7f | 730 | |
52ba6929 | 731 | flags &= BTRFS_BLOCK_GROUP_TYPE_MASK; |
b742bb82 | 732 | |
4184ea7f CM |
733 | rcu_read_lock(); |
734 | list_for_each_entry_rcu(found, head, list) { | |
67377734 | 735 | if (found->flags & flags) { |
4184ea7f | 736 | rcu_read_unlock(); |
0f9dd46c | 737 | return found; |
4184ea7f | 738 | } |
0f9dd46c | 739 | } |
4184ea7f | 740 | rcu_read_unlock(); |
0f9dd46c | 741 | return NULL; |
6324fbf3 CM |
742 | } |
743 | ||
0d9f824d | 744 | static void add_pinned_bytes(struct btrfs_fs_info *fs_info, s64 num_bytes, |
29d2b84c | 745 | bool metadata, u64 root_objectid) |
0d9f824d OS |
746 | { |
747 | struct btrfs_space_info *space_info; | |
748 | u64 flags; | |
749 | ||
29d2b84c | 750 | if (metadata) { |
0d9f824d OS |
751 | if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID) |
752 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
753 | else | |
754 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
755 | } else { | |
756 | flags = BTRFS_BLOCK_GROUP_DATA; | |
757 | } | |
758 | ||
759 | space_info = __find_space_info(fs_info, flags); | |
55e8196a | 760 | ASSERT(space_info); |
0d9f824d OS |
761 | percpu_counter_add(&space_info->total_bytes_pinned, num_bytes); |
762 | } | |
763 | ||
4184ea7f CM |
764 | /* |
765 | * after adding space to the filesystem, we need to clear the full flags | |
766 | * on all the space infos. | |
767 | */ | |
768 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) | |
769 | { | |
770 | struct list_head *head = &info->space_info; | |
771 | struct btrfs_space_info *found; | |
772 | ||
773 | rcu_read_lock(); | |
774 | list_for_each_entry_rcu(found, head, list) | |
775 | found->full = 0; | |
776 | rcu_read_unlock(); | |
777 | } | |
778 | ||
1a4ed8fd | 779 | /* simple helper to search for an existing data extent at a given offset */ |
2ff7e61e | 780 | int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len) |
e02119d5 CM |
781 | { |
782 | int ret; | |
783 | struct btrfs_key key; | |
31840ae1 | 784 | struct btrfs_path *path; |
e02119d5 | 785 | |
31840ae1 | 786 | path = btrfs_alloc_path(); |
d8926bb3 MF |
787 | if (!path) |
788 | return -ENOMEM; | |
789 | ||
e02119d5 CM |
790 | key.objectid = start; |
791 | key.offset = len; | |
3173a18f | 792 | key.type = BTRFS_EXTENT_ITEM_KEY; |
0b246afa | 793 | ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0); |
31840ae1 | 794 | btrfs_free_path(path); |
7bb86316 CM |
795 | return ret; |
796 | } | |
797 | ||
a22285a6 | 798 | /* |
3173a18f | 799 | * helper function to lookup reference count and flags of a tree block. |
a22285a6 YZ |
800 | * |
801 | * the head node for delayed ref is used to store the sum of all the | |
802 | * reference count modifications queued up in the rbtree. the head | |
803 | * node may also store the extent flags to set. This way you can check | |
804 | * to see what the reference count and extent flags would be if all of | |
805 | * the delayed refs are not processed. | |
806 | */ | |
807 | int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, | |
2ff7e61e | 808 | struct btrfs_fs_info *fs_info, u64 bytenr, |
3173a18f | 809 | u64 offset, int metadata, u64 *refs, u64 *flags) |
a22285a6 YZ |
810 | { |
811 | struct btrfs_delayed_ref_head *head; | |
812 | struct btrfs_delayed_ref_root *delayed_refs; | |
813 | struct btrfs_path *path; | |
814 | struct btrfs_extent_item *ei; | |
815 | struct extent_buffer *leaf; | |
816 | struct btrfs_key key; | |
817 | u32 item_size; | |
818 | u64 num_refs; | |
819 | u64 extent_flags; | |
820 | int ret; | |
821 | ||
3173a18f JB |
822 | /* |
823 | * If we don't have skinny metadata, don't bother doing anything | |
824 | * different | |
825 | */ | |
0b246afa JM |
826 | if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) { |
827 | offset = fs_info->nodesize; | |
3173a18f JB |
828 | metadata = 0; |
829 | } | |
830 | ||
a22285a6 YZ |
831 | path = btrfs_alloc_path(); |
832 | if (!path) | |
833 | return -ENOMEM; | |
834 | ||
a22285a6 YZ |
835 | if (!trans) { |
836 | path->skip_locking = 1; | |
837 | path->search_commit_root = 1; | |
838 | } | |
639eefc8 FDBM |
839 | |
840 | search_again: | |
841 | key.objectid = bytenr; | |
842 | key.offset = offset; | |
843 | if (metadata) | |
844 | key.type = BTRFS_METADATA_ITEM_KEY; | |
845 | else | |
846 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
847 | ||
0b246afa | 848 | ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0); |
a22285a6 YZ |
849 | if (ret < 0) |
850 | goto out_free; | |
851 | ||
3173a18f | 852 | if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { |
74be9510 FDBM |
853 | if (path->slots[0]) { |
854 | path->slots[0]--; | |
855 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
856 | path->slots[0]); | |
857 | if (key.objectid == bytenr && | |
858 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
0b246afa | 859 | key.offset == fs_info->nodesize) |
74be9510 FDBM |
860 | ret = 0; |
861 | } | |
3173a18f JB |
862 | } |
863 | ||
a22285a6 YZ |
864 | if (ret == 0) { |
865 | leaf = path->nodes[0]; | |
866 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
867 | if (item_size >= sizeof(*ei)) { | |
868 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
869 | struct btrfs_extent_item); | |
870 | num_refs = btrfs_extent_refs(leaf, ei); | |
871 | extent_flags = btrfs_extent_flags(leaf, ei); | |
872 | } else { | |
873 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
874 | struct btrfs_extent_item_v0 *ei0; | |
875 | BUG_ON(item_size != sizeof(*ei0)); | |
876 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
877 | struct btrfs_extent_item_v0); | |
878 | num_refs = btrfs_extent_refs_v0(leaf, ei0); | |
879 | /* FIXME: this isn't correct for data */ | |
880 | extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
881 | #else | |
882 | BUG(); | |
883 | #endif | |
884 | } | |
885 | BUG_ON(num_refs == 0); | |
886 | } else { | |
887 | num_refs = 0; | |
888 | extent_flags = 0; | |
889 | ret = 0; | |
890 | } | |
891 | ||
892 | if (!trans) | |
893 | goto out; | |
894 | ||
895 | delayed_refs = &trans->transaction->delayed_refs; | |
896 | spin_lock(&delayed_refs->lock); | |
f72ad18e | 897 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
a22285a6 YZ |
898 | if (head) { |
899 | if (!mutex_trylock(&head->mutex)) { | |
d278850e | 900 | refcount_inc(&head->refs); |
a22285a6 YZ |
901 | spin_unlock(&delayed_refs->lock); |
902 | ||
b3b4aa74 | 903 | btrfs_release_path(path); |
a22285a6 | 904 | |
8cc33e5c DS |
905 | /* |
906 | * Mutex was contended, block until it's released and try | |
907 | * again | |
908 | */ | |
a22285a6 YZ |
909 | mutex_lock(&head->mutex); |
910 | mutex_unlock(&head->mutex); | |
d278850e | 911 | btrfs_put_delayed_ref_head(head); |
639eefc8 | 912 | goto search_again; |
a22285a6 | 913 | } |
d7df2c79 | 914 | spin_lock(&head->lock); |
a22285a6 YZ |
915 | if (head->extent_op && head->extent_op->update_flags) |
916 | extent_flags |= head->extent_op->flags_to_set; | |
917 | else | |
918 | BUG_ON(num_refs == 0); | |
919 | ||
d278850e | 920 | num_refs += head->ref_mod; |
d7df2c79 | 921 | spin_unlock(&head->lock); |
a22285a6 YZ |
922 | mutex_unlock(&head->mutex); |
923 | } | |
924 | spin_unlock(&delayed_refs->lock); | |
925 | out: | |
926 | WARN_ON(num_refs == 0); | |
927 | if (refs) | |
928 | *refs = num_refs; | |
929 | if (flags) | |
930 | *flags = extent_flags; | |
931 | out_free: | |
932 | btrfs_free_path(path); | |
933 | return ret; | |
934 | } | |
935 | ||
d8d5f3e1 CM |
936 | /* |
937 | * Back reference rules. Back refs have three main goals: | |
938 | * | |
939 | * 1) differentiate between all holders of references to an extent so that | |
940 | * when a reference is dropped we can make sure it was a valid reference | |
941 | * before freeing the extent. | |
942 | * | |
943 | * 2) Provide enough information to quickly find the holders of an extent | |
944 | * if we notice a given block is corrupted or bad. | |
945 | * | |
946 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
947 | * maintenance. This is actually the same as #2, but with a slightly | |
948 | * different use case. | |
949 | * | |
5d4f98a2 YZ |
950 | * There are two kinds of back refs. The implicit back refs is optimized |
951 | * for pointers in non-shared tree blocks. For a given pointer in a block, | |
952 | * back refs of this kind provide information about the block's owner tree | |
953 | * and the pointer's key. These information allow us to find the block by | |
954 | * b-tree searching. The full back refs is for pointers in tree blocks not | |
955 | * referenced by their owner trees. The location of tree block is recorded | |
956 | * in the back refs. Actually the full back refs is generic, and can be | |
957 | * used in all cases the implicit back refs is used. The major shortcoming | |
958 | * of the full back refs is its overhead. Every time a tree block gets | |
959 | * COWed, we have to update back refs entry for all pointers in it. | |
960 | * | |
961 | * For a newly allocated tree block, we use implicit back refs for | |
962 | * pointers in it. This means most tree related operations only involve | |
963 | * implicit back refs. For a tree block created in old transaction, the | |
964 | * only way to drop a reference to it is COW it. So we can detect the | |
965 | * event that tree block loses its owner tree's reference and do the | |
966 | * back refs conversion. | |
967 | * | |
01327610 | 968 | * When a tree block is COWed through a tree, there are four cases: |
5d4f98a2 YZ |
969 | * |
970 | * The reference count of the block is one and the tree is the block's | |
971 | * owner tree. Nothing to do in this case. | |
972 | * | |
973 | * The reference count of the block is one and the tree is not the | |
974 | * block's owner tree. In this case, full back refs is used for pointers | |
975 | * in the block. Remove these full back refs, add implicit back refs for | |
976 | * every pointers in the new block. | |
977 | * | |
978 | * The reference count of the block is greater than one and the tree is | |
979 | * the block's owner tree. In this case, implicit back refs is used for | |
980 | * pointers in the block. Add full back refs for every pointers in the | |
981 | * block, increase lower level extents' reference counts. The original | |
982 | * implicit back refs are entailed to the new block. | |
983 | * | |
984 | * The reference count of the block is greater than one and the tree is | |
985 | * not the block's owner tree. Add implicit back refs for every pointer in | |
986 | * the new block, increase lower level extents' reference count. | |
987 | * | |
988 | * Back Reference Key composing: | |
989 | * | |
990 | * The key objectid corresponds to the first byte in the extent, | |
991 | * The key type is used to differentiate between types of back refs. | |
992 | * There are different meanings of the key offset for different types | |
993 | * of back refs. | |
994 | * | |
d8d5f3e1 CM |
995 | * File extents can be referenced by: |
996 | * | |
997 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
31840ae1 | 998 | * - different files inside a single subvolume |
d8d5f3e1 CM |
999 | * - different offsets inside a file (bookend extents in file.c) |
1000 | * | |
5d4f98a2 | 1001 | * The extent ref structure for the implicit back refs has fields for: |
d8d5f3e1 CM |
1002 | * |
1003 | * - Objectid of the subvolume root | |
d8d5f3e1 | 1004 | * - objectid of the file holding the reference |
5d4f98a2 YZ |
1005 | * - original offset in the file |
1006 | * - how many bookend extents | |
d8d5f3e1 | 1007 | * |
5d4f98a2 YZ |
1008 | * The key offset for the implicit back refs is hash of the first |
1009 | * three fields. | |
d8d5f3e1 | 1010 | * |
5d4f98a2 | 1011 | * The extent ref structure for the full back refs has field for: |
d8d5f3e1 | 1012 | * |
5d4f98a2 | 1013 | * - number of pointers in the tree leaf |
d8d5f3e1 | 1014 | * |
5d4f98a2 YZ |
1015 | * The key offset for the implicit back refs is the first byte of |
1016 | * the tree leaf | |
d8d5f3e1 | 1017 | * |
5d4f98a2 YZ |
1018 | * When a file extent is allocated, The implicit back refs is used. |
1019 | * the fields are filled in: | |
d8d5f3e1 | 1020 | * |
5d4f98a2 | 1021 | * (root_key.objectid, inode objectid, offset in file, 1) |
d8d5f3e1 | 1022 | * |
5d4f98a2 YZ |
1023 | * When a file extent is removed file truncation, we find the |
1024 | * corresponding implicit back refs and check the following fields: | |
d8d5f3e1 | 1025 | * |
5d4f98a2 | 1026 | * (btrfs_header_owner(leaf), inode objectid, offset in file) |
d8d5f3e1 | 1027 | * |
5d4f98a2 | 1028 | * Btree extents can be referenced by: |
d8d5f3e1 | 1029 | * |
5d4f98a2 | 1030 | * - Different subvolumes |
d8d5f3e1 | 1031 | * |
5d4f98a2 YZ |
1032 | * Both the implicit back refs and the full back refs for tree blocks |
1033 | * only consist of key. The key offset for the implicit back refs is | |
1034 | * objectid of block's owner tree. The key offset for the full back refs | |
1035 | * is the first byte of parent block. | |
d8d5f3e1 | 1036 | * |
5d4f98a2 YZ |
1037 | * When implicit back refs is used, information about the lowest key and |
1038 | * level of the tree block are required. These information are stored in | |
1039 | * tree block info structure. | |
d8d5f3e1 | 1040 | */ |
31840ae1 | 1041 | |
5d4f98a2 YZ |
1042 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
1043 | static int convert_extent_item_v0(struct btrfs_trans_handle *trans, | |
87bde3cd | 1044 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
1045 | struct btrfs_path *path, |
1046 | u64 owner, u32 extra_size) | |
7bb86316 | 1047 | { |
87bde3cd | 1048 | struct btrfs_root *root = fs_info->extent_root; |
5d4f98a2 YZ |
1049 | struct btrfs_extent_item *item; |
1050 | struct btrfs_extent_item_v0 *ei0; | |
1051 | struct btrfs_extent_ref_v0 *ref0; | |
1052 | struct btrfs_tree_block_info *bi; | |
1053 | struct extent_buffer *leaf; | |
7bb86316 | 1054 | struct btrfs_key key; |
5d4f98a2 YZ |
1055 | struct btrfs_key found_key; |
1056 | u32 new_size = sizeof(*item); | |
1057 | u64 refs; | |
1058 | int ret; | |
1059 | ||
1060 | leaf = path->nodes[0]; | |
1061 | BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0)); | |
1062 | ||
1063 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1064 | ei0 = btrfs_item_ptr(leaf, path->slots[0], | |
1065 | struct btrfs_extent_item_v0); | |
1066 | refs = btrfs_extent_refs_v0(leaf, ei0); | |
1067 | ||
1068 | if (owner == (u64)-1) { | |
1069 | while (1) { | |
1070 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1071 | ret = btrfs_next_leaf(root, path); | |
1072 | if (ret < 0) | |
1073 | return ret; | |
79787eaa | 1074 | BUG_ON(ret > 0); /* Corruption */ |
5d4f98a2 YZ |
1075 | leaf = path->nodes[0]; |
1076 | } | |
1077 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1078 | path->slots[0]); | |
1079 | BUG_ON(key.objectid != found_key.objectid); | |
1080 | if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) { | |
1081 | path->slots[0]++; | |
1082 | continue; | |
1083 | } | |
1084 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1085 | struct btrfs_extent_ref_v0); | |
1086 | owner = btrfs_ref_objectid_v0(leaf, ref0); | |
1087 | break; | |
1088 | } | |
1089 | } | |
b3b4aa74 | 1090 | btrfs_release_path(path); |
5d4f98a2 YZ |
1091 | |
1092 | if (owner < BTRFS_FIRST_FREE_OBJECTID) | |
1093 | new_size += sizeof(*bi); | |
1094 | ||
1095 | new_size -= sizeof(*ei0); | |
1096 | ret = btrfs_search_slot(trans, root, &key, path, | |
1097 | new_size + extra_size, 1); | |
1098 | if (ret < 0) | |
1099 | return ret; | |
79787eaa | 1100 | BUG_ON(ret); /* Corruption */ |
5d4f98a2 | 1101 | |
87bde3cd | 1102 | btrfs_extend_item(fs_info, path, new_size); |
5d4f98a2 YZ |
1103 | |
1104 | leaf = path->nodes[0]; | |
1105 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1106 | btrfs_set_extent_refs(leaf, item, refs); | |
1107 | /* FIXME: get real generation */ | |
1108 | btrfs_set_extent_generation(leaf, item, 0); | |
1109 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1110 | btrfs_set_extent_flags(leaf, item, | |
1111 | BTRFS_EXTENT_FLAG_TREE_BLOCK | | |
1112 | BTRFS_BLOCK_FLAG_FULL_BACKREF); | |
1113 | bi = (struct btrfs_tree_block_info *)(item + 1); | |
1114 | /* FIXME: get first key of the block */ | |
b159fa28 | 1115 | memzero_extent_buffer(leaf, (unsigned long)bi, sizeof(*bi)); |
5d4f98a2 YZ |
1116 | btrfs_set_tree_block_level(leaf, bi, (int)owner); |
1117 | } else { | |
1118 | btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA); | |
1119 | } | |
1120 | btrfs_mark_buffer_dirty(leaf); | |
1121 | return 0; | |
1122 | } | |
1123 | #endif | |
1124 | ||
167ce953 LB |
1125 | /* |
1126 | * is_data == BTRFS_REF_TYPE_BLOCK, tree block type is required, | |
1127 | * is_data == BTRFS_REF_TYPE_DATA, data type is requried, | |
1128 | * is_data == BTRFS_REF_TYPE_ANY, either type is OK. | |
1129 | */ | |
1130 | int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb, | |
1131 | struct btrfs_extent_inline_ref *iref, | |
1132 | enum btrfs_inline_ref_type is_data) | |
1133 | { | |
1134 | int type = btrfs_extent_inline_ref_type(eb, iref); | |
64ecdb64 | 1135 | u64 offset = btrfs_extent_inline_ref_offset(eb, iref); |
167ce953 LB |
1136 | |
1137 | if (type == BTRFS_TREE_BLOCK_REF_KEY || | |
1138 | type == BTRFS_SHARED_BLOCK_REF_KEY || | |
1139 | type == BTRFS_SHARED_DATA_REF_KEY || | |
1140 | type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1141 | if (is_data == BTRFS_REF_TYPE_BLOCK) { | |
64ecdb64 | 1142 | if (type == BTRFS_TREE_BLOCK_REF_KEY) |
167ce953 | 1143 | return type; |
64ecdb64 LB |
1144 | if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
1145 | ASSERT(eb->fs_info); | |
1146 | /* | |
1147 | * Every shared one has parent tree | |
1148 | * block, which must be aligned to | |
1149 | * nodesize. | |
1150 | */ | |
1151 | if (offset && | |
1152 | IS_ALIGNED(offset, eb->fs_info->nodesize)) | |
1153 | return type; | |
1154 | } | |
167ce953 | 1155 | } else if (is_data == BTRFS_REF_TYPE_DATA) { |
64ecdb64 | 1156 | if (type == BTRFS_EXTENT_DATA_REF_KEY) |
167ce953 | 1157 | return type; |
64ecdb64 LB |
1158 | if (type == BTRFS_SHARED_DATA_REF_KEY) { |
1159 | ASSERT(eb->fs_info); | |
1160 | /* | |
1161 | * Every shared one has parent tree | |
1162 | * block, which must be aligned to | |
1163 | * nodesize. | |
1164 | */ | |
1165 | if (offset && | |
1166 | IS_ALIGNED(offset, eb->fs_info->nodesize)) | |
1167 | return type; | |
1168 | } | |
167ce953 LB |
1169 | } else { |
1170 | ASSERT(is_data == BTRFS_REF_TYPE_ANY); | |
1171 | return type; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | btrfs_print_leaf((struct extent_buffer *)eb); | |
1176 | btrfs_err(eb->fs_info, "eb %llu invalid extent inline ref type %d", | |
1177 | eb->start, type); | |
1178 | WARN_ON(1); | |
1179 | ||
1180 | return BTRFS_REF_TYPE_INVALID; | |
1181 | } | |
1182 | ||
5d4f98a2 YZ |
1183 | static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) |
1184 | { | |
1185 | u32 high_crc = ~(u32)0; | |
1186 | u32 low_crc = ~(u32)0; | |
1187 | __le64 lenum; | |
1188 | ||
1189 | lenum = cpu_to_le64(root_objectid); | |
9678c543 | 1190 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1191 | lenum = cpu_to_le64(owner); |
9678c543 | 1192 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 | 1193 | lenum = cpu_to_le64(offset); |
9678c543 | 1194 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); |
5d4f98a2 YZ |
1195 | |
1196 | return ((u64)high_crc << 31) ^ (u64)low_crc; | |
1197 | } | |
1198 | ||
1199 | static u64 hash_extent_data_ref_item(struct extent_buffer *leaf, | |
1200 | struct btrfs_extent_data_ref *ref) | |
1201 | { | |
1202 | return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref), | |
1203 | btrfs_extent_data_ref_objectid(leaf, ref), | |
1204 | btrfs_extent_data_ref_offset(leaf, ref)); | |
1205 | } | |
1206 | ||
1207 | static int match_extent_data_ref(struct extent_buffer *leaf, | |
1208 | struct btrfs_extent_data_ref *ref, | |
1209 | u64 root_objectid, u64 owner, u64 offset) | |
1210 | { | |
1211 | if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid || | |
1212 | btrfs_extent_data_ref_objectid(leaf, ref) != owner || | |
1213 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
1214 | return 0; | |
1215 | return 1; | |
1216 | } | |
1217 | ||
1218 | static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1219 | struct btrfs_path *path, |
1220 | u64 bytenr, u64 parent, | |
1221 | u64 root_objectid, | |
1222 | u64 owner, u64 offset) | |
1223 | { | |
bd1d53ef | 1224 | struct btrfs_root *root = trans->fs_info->extent_root; |
5d4f98a2 YZ |
1225 | struct btrfs_key key; |
1226 | struct btrfs_extent_data_ref *ref; | |
31840ae1 | 1227 | struct extent_buffer *leaf; |
5d4f98a2 | 1228 | u32 nritems; |
74493f7a | 1229 | int ret; |
5d4f98a2 YZ |
1230 | int recow; |
1231 | int err = -ENOENT; | |
74493f7a | 1232 | |
31840ae1 | 1233 | key.objectid = bytenr; |
5d4f98a2 YZ |
1234 | if (parent) { |
1235 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1236 | key.offset = parent; | |
1237 | } else { | |
1238 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1239 | key.offset = hash_extent_data_ref(root_objectid, | |
1240 | owner, offset); | |
1241 | } | |
1242 | again: | |
1243 | recow = 0; | |
1244 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1245 | if (ret < 0) { | |
1246 | err = ret; | |
1247 | goto fail; | |
1248 | } | |
31840ae1 | 1249 | |
5d4f98a2 YZ |
1250 | if (parent) { |
1251 | if (!ret) | |
1252 | return 0; | |
1253 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1254 | key.type = BTRFS_EXTENT_REF_V0_KEY; | |
b3b4aa74 | 1255 | btrfs_release_path(path); |
5d4f98a2 YZ |
1256 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1257 | if (ret < 0) { | |
1258 | err = ret; | |
1259 | goto fail; | |
1260 | } | |
1261 | if (!ret) | |
1262 | return 0; | |
1263 | #endif | |
1264 | goto fail; | |
31840ae1 ZY |
1265 | } |
1266 | ||
1267 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1268 | nritems = btrfs_header_nritems(leaf); |
1269 | while (1) { | |
1270 | if (path->slots[0] >= nritems) { | |
1271 | ret = btrfs_next_leaf(root, path); | |
1272 | if (ret < 0) | |
1273 | err = ret; | |
1274 | if (ret) | |
1275 | goto fail; | |
1276 | ||
1277 | leaf = path->nodes[0]; | |
1278 | nritems = btrfs_header_nritems(leaf); | |
1279 | recow = 1; | |
1280 | } | |
1281 | ||
1282 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1283 | if (key.objectid != bytenr || | |
1284 | key.type != BTRFS_EXTENT_DATA_REF_KEY) | |
1285 | goto fail; | |
1286 | ||
1287 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1288 | struct btrfs_extent_data_ref); | |
1289 | ||
1290 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1291 | owner, offset)) { | |
1292 | if (recow) { | |
b3b4aa74 | 1293 | btrfs_release_path(path); |
5d4f98a2 YZ |
1294 | goto again; |
1295 | } | |
1296 | err = 0; | |
1297 | break; | |
1298 | } | |
1299 | path->slots[0]++; | |
31840ae1 | 1300 | } |
5d4f98a2 YZ |
1301 | fail: |
1302 | return err; | |
31840ae1 ZY |
1303 | } |
1304 | ||
5d4f98a2 | 1305 | static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1306 | struct btrfs_path *path, |
1307 | u64 bytenr, u64 parent, | |
1308 | u64 root_objectid, u64 owner, | |
1309 | u64 offset, int refs_to_add) | |
31840ae1 | 1310 | { |
62b895af | 1311 | struct btrfs_root *root = trans->fs_info->extent_root; |
31840ae1 ZY |
1312 | struct btrfs_key key; |
1313 | struct extent_buffer *leaf; | |
5d4f98a2 | 1314 | u32 size; |
31840ae1 ZY |
1315 | u32 num_refs; |
1316 | int ret; | |
74493f7a | 1317 | |
74493f7a | 1318 | key.objectid = bytenr; |
5d4f98a2 YZ |
1319 | if (parent) { |
1320 | key.type = BTRFS_SHARED_DATA_REF_KEY; | |
1321 | key.offset = parent; | |
1322 | size = sizeof(struct btrfs_shared_data_ref); | |
1323 | } else { | |
1324 | key.type = BTRFS_EXTENT_DATA_REF_KEY; | |
1325 | key.offset = hash_extent_data_ref(root_objectid, | |
1326 | owner, offset); | |
1327 | size = sizeof(struct btrfs_extent_data_ref); | |
1328 | } | |
74493f7a | 1329 | |
5d4f98a2 YZ |
1330 | ret = btrfs_insert_empty_item(trans, root, path, &key, size); |
1331 | if (ret && ret != -EEXIST) | |
1332 | goto fail; | |
1333 | ||
1334 | leaf = path->nodes[0]; | |
1335 | if (parent) { | |
1336 | struct btrfs_shared_data_ref *ref; | |
31840ae1 | 1337 | ref = btrfs_item_ptr(leaf, path->slots[0], |
5d4f98a2 YZ |
1338 | struct btrfs_shared_data_ref); |
1339 | if (ret == 0) { | |
1340 | btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add); | |
1341 | } else { | |
1342 | num_refs = btrfs_shared_data_ref_count(leaf, ref); | |
1343 | num_refs += refs_to_add; | |
1344 | btrfs_set_shared_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1345 | } |
5d4f98a2 YZ |
1346 | } else { |
1347 | struct btrfs_extent_data_ref *ref; | |
1348 | while (ret == -EEXIST) { | |
1349 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1350 | struct btrfs_extent_data_ref); | |
1351 | if (match_extent_data_ref(leaf, ref, root_objectid, | |
1352 | owner, offset)) | |
1353 | break; | |
b3b4aa74 | 1354 | btrfs_release_path(path); |
5d4f98a2 YZ |
1355 | key.offset++; |
1356 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1357 | size); | |
1358 | if (ret && ret != -EEXIST) | |
1359 | goto fail; | |
31840ae1 | 1360 | |
5d4f98a2 YZ |
1361 | leaf = path->nodes[0]; |
1362 | } | |
1363 | ref = btrfs_item_ptr(leaf, path->slots[0], | |
1364 | struct btrfs_extent_data_ref); | |
1365 | if (ret == 0) { | |
1366 | btrfs_set_extent_data_ref_root(leaf, ref, | |
1367 | root_objectid); | |
1368 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
1369 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
1370 | btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add); | |
1371 | } else { | |
1372 | num_refs = btrfs_extent_data_ref_count(leaf, ref); | |
1373 | num_refs += refs_to_add; | |
1374 | btrfs_set_extent_data_ref_count(leaf, ref, num_refs); | |
31840ae1 | 1375 | } |
31840ae1 | 1376 | } |
5d4f98a2 YZ |
1377 | btrfs_mark_buffer_dirty(leaf); |
1378 | ret = 0; | |
1379 | fail: | |
b3b4aa74 | 1380 | btrfs_release_path(path); |
7bb86316 | 1381 | return ret; |
74493f7a CM |
1382 | } |
1383 | ||
5d4f98a2 | 1384 | static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 | 1385 | struct btrfs_path *path, |
fcebe456 | 1386 | int refs_to_drop, int *last_ref) |
31840ae1 | 1387 | { |
5d4f98a2 YZ |
1388 | struct btrfs_key key; |
1389 | struct btrfs_extent_data_ref *ref1 = NULL; | |
1390 | struct btrfs_shared_data_ref *ref2 = NULL; | |
31840ae1 | 1391 | struct extent_buffer *leaf; |
5d4f98a2 | 1392 | u32 num_refs = 0; |
31840ae1 ZY |
1393 | int ret = 0; |
1394 | ||
1395 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
1396 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
1397 | ||
1398 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1399 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1400 | struct btrfs_extent_data_ref); | |
1401 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1402 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1403 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1404 | struct btrfs_shared_data_ref); | |
1405 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1406 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1407 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1408 | struct btrfs_extent_ref_v0 *ref0; | |
1409 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1410 | struct btrfs_extent_ref_v0); | |
1411 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
1412 | #endif | |
1413 | } else { | |
1414 | BUG(); | |
1415 | } | |
1416 | ||
56bec294 CM |
1417 | BUG_ON(num_refs < refs_to_drop); |
1418 | num_refs -= refs_to_drop; | |
5d4f98a2 | 1419 | |
31840ae1 | 1420 | if (num_refs == 0) { |
e9f6290d | 1421 | ret = btrfs_del_item(trans, trans->fs_info->extent_root, path); |
fcebe456 | 1422 | *last_ref = 1; |
31840ae1 | 1423 | } else { |
5d4f98a2 YZ |
1424 | if (key.type == BTRFS_EXTENT_DATA_REF_KEY) |
1425 | btrfs_set_extent_data_ref_count(leaf, ref1, num_refs); | |
1426 | else if (key.type == BTRFS_SHARED_DATA_REF_KEY) | |
1427 | btrfs_set_shared_data_ref_count(leaf, ref2, num_refs); | |
1428 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1429 | else { | |
1430 | struct btrfs_extent_ref_v0 *ref0; | |
1431 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1432 | struct btrfs_extent_ref_v0); | |
1433 | btrfs_set_ref_count_v0(leaf, ref0, num_refs); | |
1434 | } | |
1435 | #endif | |
31840ae1 ZY |
1436 | btrfs_mark_buffer_dirty(leaf); |
1437 | } | |
31840ae1 ZY |
1438 | return ret; |
1439 | } | |
1440 | ||
9ed0dea0 | 1441 | static noinline u32 extent_data_ref_count(struct btrfs_path *path, |
5d4f98a2 | 1442 | struct btrfs_extent_inline_ref *iref) |
15916de8 | 1443 | { |
5d4f98a2 YZ |
1444 | struct btrfs_key key; |
1445 | struct extent_buffer *leaf; | |
1446 | struct btrfs_extent_data_ref *ref1; | |
1447 | struct btrfs_shared_data_ref *ref2; | |
1448 | u32 num_refs = 0; | |
3de28d57 | 1449 | int type; |
5d4f98a2 YZ |
1450 | |
1451 | leaf = path->nodes[0]; | |
1452 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1453 | if (iref) { | |
3de28d57 LB |
1454 | /* |
1455 | * If type is invalid, we should have bailed out earlier than | |
1456 | * this call. | |
1457 | */ | |
1458 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA); | |
1459 | ASSERT(type != BTRFS_REF_TYPE_INVALID); | |
1460 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
5d4f98a2 YZ |
1461 | ref1 = (struct btrfs_extent_data_ref *)(&iref->offset); |
1462 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1463 | } else { | |
1464 | ref2 = (struct btrfs_shared_data_ref *)(iref + 1); | |
1465 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1466 | } | |
1467 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1468 | ref1 = btrfs_item_ptr(leaf, path->slots[0], | |
1469 | struct btrfs_extent_data_ref); | |
1470 | num_refs = btrfs_extent_data_ref_count(leaf, ref1); | |
1471 | } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { | |
1472 | ref2 = btrfs_item_ptr(leaf, path->slots[0], | |
1473 | struct btrfs_shared_data_ref); | |
1474 | num_refs = btrfs_shared_data_ref_count(leaf, ref2); | |
1475 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1476 | } else if (key.type == BTRFS_EXTENT_REF_V0_KEY) { | |
1477 | struct btrfs_extent_ref_v0 *ref0; | |
1478 | ref0 = btrfs_item_ptr(leaf, path->slots[0], | |
1479 | struct btrfs_extent_ref_v0); | |
1480 | num_refs = btrfs_ref_count_v0(leaf, ref0); | |
4b4e25f2 | 1481 | #endif |
5d4f98a2 YZ |
1482 | } else { |
1483 | WARN_ON(1); | |
1484 | } | |
1485 | return num_refs; | |
1486 | } | |
15916de8 | 1487 | |
5d4f98a2 | 1488 | static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1489 | struct btrfs_path *path, |
1490 | u64 bytenr, u64 parent, | |
1491 | u64 root_objectid) | |
1f3c79a2 | 1492 | { |
b8582eea | 1493 | struct btrfs_root *root = trans->fs_info->extent_root; |
5d4f98a2 | 1494 | struct btrfs_key key; |
1f3c79a2 | 1495 | int ret; |
1f3c79a2 | 1496 | |
5d4f98a2 YZ |
1497 | key.objectid = bytenr; |
1498 | if (parent) { | |
1499 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1500 | key.offset = parent; | |
1501 | } else { | |
1502 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1503 | key.offset = root_objectid; | |
1f3c79a2 LH |
1504 | } |
1505 | ||
5d4f98a2 YZ |
1506 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1507 | if (ret > 0) | |
1508 | ret = -ENOENT; | |
1509 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1510 | if (ret == -ENOENT && parent) { | |
b3b4aa74 | 1511 | btrfs_release_path(path); |
5d4f98a2 YZ |
1512 | key.type = BTRFS_EXTENT_REF_V0_KEY; |
1513 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1514 | if (ret > 0) | |
1515 | ret = -ENOENT; | |
1516 | } | |
1f3c79a2 | 1517 | #endif |
5d4f98a2 | 1518 | return ret; |
1f3c79a2 LH |
1519 | } |
1520 | ||
5d4f98a2 | 1521 | static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1522 | struct btrfs_path *path, |
1523 | u64 bytenr, u64 parent, | |
1524 | u64 root_objectid) | |
31840ae1 | 1525 | { |
5d4f98a2 | 1526 | struct btrfs_key key; |
31840ae1 | 1527 | int ret; |
31840ae1 | 1528 | |
5d4f98a2 YZ |
1529 | key.objectid = bytenr; |
1530 | if (parent) { | |
1531 | key.type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1532 | key.offset = parent; | |
1533 | } else { | |
1534 | key.type = BTRFS_TREE_BLOCK_REF_KEY; | |
1535 | key.offset = root_objectid; | |
1536 | } | |
1537 | ||
10728404 | 1538 | ret = btrfs_insert_empty_item(trans, trans->fs_info->extent_root, |
87bde3cd | 1539 | path, &key, 0); |
b3b4aa74 | 1540 | btrfs_release_path(path); |
31840ae1 ZY |
1541 | return ret; |
1542 | } | |
1543 | ||
5d4f98a2 | 1544 | static inline int extent_ref_type(u64 parent, u64 owner) |
31840ae1 | 1545 | { |
5d4f98a2 YZ |
1546 | int type; |
1547 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1548 | if (parent > 0) | |
1549 | type = BTRFS_SHARED_BLOCK_REF_KEY; | |
1550 | else | |
1551 | type = BTRFS_TREE_BLOCK_REF_KEY; | |
1552 | } else { | |
1553 | if (parent > 0) | |
1554 | type = BTRFS_SHARED_DATA_REF_KEY; | |
1555 | else | |
1556 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
1557 | } | |
1558 | return type; | |
31840ae1 | 1559 | } |
56bec294 | 1560 | |
2c47e605 YZ |
1561 | static int find_next_key(struct btrfs_path *path, int level, |
1562 | struct btrfs_key *key) | |
56bec294 | 1563 | |
02217ed2 | 1564 | { |
2c47e605 | 1565 | for (; level < BTRFS_MAX_LEVEL; level++) { |
5d4f98a2 YZ |
1566 | if (!path->nodes[level]) |
1567 | break; | |
5d4f98a2 YZ |
1568 | if (path->slots[level] + 1 >= |
1569 | btrfs_header_nritems(path->nodes[level])) | |
1570 | continue; | |
1571 | if (level == 0) | |
1572 | btrfs_item_key_to_cpu(path->nodes[level], key, | |
1573 | path->slots[level] + 1); | |
1574 | else | |
1575 | btrfs_node_key_to_cpu(path->nodes[level], key, | |
1576 | path->slots[level] + 1); | |
1577 | return 0; | |
1578 | } | |
1579 | return 1; | |
1580 | } | |
037e6390 | 1581 | |
5d4f98a2 YZ |
1582 | /* |
1583 | * look for inline back ref. if back ref is found, *ref_ret is set | |
1584 | * to the address of inline back ref, and 0 is returned. | |
1585 | * | |
1586 | * if back ref isn't found, *ref_ret is set to the address where it | |
1587 | * should be inserted, and -ENOENT is returned. | |
1588 | * | |
1589 | * if insert is true and there are too many inline back refs, the path | |
1590 | * points to the extent item, and -EAGAIN is returned. | |
1591 | * | |
1592 | * NOTE: inline back refs are ordered in the same way that back ref | |
1593 | * items in the tree are ordered. | |
1594 | */ | |
1595 | static noinline_for_stack | |
1596 | int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, | |
5d4f98a2 YZ |
1597 | struct btrfs_path *path, |
1598 | struct btrfs_extent_inline_ref **ref_ret, | |
1599 | u64 bytenr, u64 num_bytes, | |
1600 | u64 parent, u64 root_objectid, | |
1601 | u64 owner, u64 offset, int insert) | |
1602 | { | |
867cc1fb | 1603 | struct btrfs_fs_info *fs_info = trans->fs_info; |
87bde3cd | 1604 | struct btrfs_root *root = fs_info->extent_root; |
5d4f98a2 YZ |
1605 | struct btrfs_key key; |
1606 | struct extent_buffer *leaf; | |
1607 | struct btrfs_extent_item *ei; | |
1608 | struct btrfs_extent_inline_ref *iref; | |
1609 | u64 flags; | |
1610 | u64 item_size; | |
1611 | unsigned long ptr; | |
1612 | unsigned long end; | |
1613 | int extra_size; | |
1614 | int type; | |
1615 | int want; | |
1616 | int ret; | |
1617 | int err = 0; | |
0b246afa | 1618 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); |
3de28d57 | 1619 | int needed; |
26b8003f | 1620 | |
db94535d | 1621 | key.objectid = bytenr; |
31840ae1 | 1622 | key.type = BTRFS_EXTENT_ITEM_KEY; |
56bec294 | 1623 | key.offset = num_bytes; |
31840ae1 | 1624 | |
5d4f98a2 YZ |
1625 | want = extent_ref_type(parent, owner); |
1626 | if (insert) { | |
1627 | extra_size = btrfs_extent_inline_ref_size(want); | |
85d4198e | 1628 | path->keep_locks = 1; |
5d4f98a2 YZ |
1629 | } else |
1630 | extra_size = -1; | |
3173a18f JB |
1631 | |
1632 | /* | |
16d1c062 NB |
1633 | * Owner is our level, so we can just add one to get the level for the |
1634 | * block we are interested in. | |
3173a18f JB |
1635 | */ |
1636 | if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1637 | key.type = BTRFS_METADATA_ITEM_KEY; | |
1638 | key.offset = owner; | |
1639 | } | |
1640 | ||
1641 | again: | |
5d4f98a2 | 1642 | ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); |
b9473439 | 1643 | if (ret < 0) { |
5d4f98a2 YZ |
1644 | err = ret; |
1645 | goto out; | |
1646 | } | |
3173a18f JB |
1647 | |
1648 | /* | |
1649 | * We may be a newly converted file system which still has the old fat | |
1650 | * extent entries for metadata, so try and see if we have one of those. | |
1651 | */ | |
1652 | if (ret > 0 && skinny_metadata) { | |
1653 | skinny_metadata = false; | |
1654 | if (path->slots[0]) { | |
1655 | path->slots[0]--; | |
1656 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1657 | path->slots[0]); | |
1658 | if (key.objectid == bytenr && | |
1659 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
1660 | key.offset == num_bytes) | |
1661 | ret = 0; | |
1662 | } | |
1663 | if (ret) { | |
9ce49a0b | 1664 | key.objectid = bytenr; |
3173a18f JB |
1665 | key.type = BTRFS_EXTENT_ITEM_KEY; |
1666 | key.offset = num_bytes; | |
1667 | btrfs_release_path(path); | |
1668 | goto again; | |
1669 | } | |
1670 | } | |
1671 | ||
79787eaa JM |
1672 | if (ret && !insert) { |
1673 | err = -ENOENT; | |
1674 | goto out; | |
fae7f21c | 1675 | } else if (WARN_ON(ret)) { |
492104c8 | 1676 | err = -EIO; |
492104c8 | 1677 | goto out; |
79787eaa | 1678 | } |
5d4f98a2 YZ |
1679 | |
1680 | leaf = path->nodes[0]; | |
1681 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1682 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
1683 | if (item_size < sizeof(*ei)) { | |
1684 | if (!insert) { | |
1685 | err = -ENOENT; | |
1686 | goto out; | |
1687 | } | |
87bde3cd | 1688 | ret = convert_extent_item_v0(trans, fs_info, path, owner, |
5d4f98a2 YZ |
1689 | extra_size); |
1690 | if (ret < 0) { | |
1691 | err = ret; | |
1692 | goto out; | |
1693 | } | |
1694 | leaf = path->nodes[0]; | |
1695 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1696 | } | |
1697 | #endif | |
1698 | BUG_ON(item_size < sizeof(*ei)); | |
1699 | ||
5d4f98a2 YZ |
1700 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1701 | flags = btrfs_extent_flags(leaf, ei); | |
1702 | ||
1703 | ptr = (unsigned long)(ei + 1); | |
1704 | end = (unsigned long)ei + item_size; | |
1705 | ||
3173a18f | 1706 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) { |
5d4f98a2 YZ |
1707 | ptr += sizeof(struct btrfs_tree_block_info); |
1708 | BUG_ON(ptr > end); | |
5d4f98a2 YZ |
1709 | } |
1710 | ||
3de28d57 LB |
1711 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) |
1712 | needed = BTRFS_REF_TYPE_DATA; | |
1713 | else | |
1714 | needed = BTRFS_REF_TYPE_BLOCK; | |
1715 | ||
5d4f98a2 YZ |
1716 | err = -ENOENT; |
1717 | while (1) { | |
1718 | if (ptr >= end) { | |
1719 | WARN_ON(ptr > end); | |
1720 | break; | |
1721 | } | |
1722 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
3de28d57 LB |
1723 | type = btrfs_get_extent_inline_ref_type(leaf, iref, needed); |
1724 | if (type == BTRFS_REF_TYPE_INVALID) { | |
1725 | err = -EINVAL; | |
1726 | goto out; | |
1727 | } | |
1728 | ||
5d4f98a2 YZ |
1729 | if (want < type) |
1730 | break; | |
1731 | if (want > type) { | |
1732 | ptr += btrfs_extent_inline_ref_size(type); | |
1733 | continue; | |
1734 | } | |
1735 | ||
1736 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1737 | struct btrfs_extent_data_ref *dref; | |
1738 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1739 | if (match_extent_data_ref(leaf, dref, root_objectid, | |
1740 | owner, offset)) { | |
1741 | err = 0; | |
1742 | break; | |
1743 | } | |
1744 | if (hash_extent_data_ref_item(leaf, dref) < | |
1745 | hash_extent_data_ref(root_objectid, owner, offset)) | |
1746 | break; | |
1747 | } else { | |
1748 | u64 ref_offset; | |
1749 | ref_offset = btrfs_extent_inline_ref_offset(leaf, iref); | |
1750 | if (parent > 0) { | |
1751 | if (parent == ref_offset) { | |
1752 | err = 0; | |
1753 | break; | |
1754 | } | |
1755 | if (ref_offset < parent) | |
1756 | break; | |
1757 | } else { | |
1758 | if (root_objectid == ref_offset) { | |
1759 | err = 0; | |
1760 | break; | |
1761 | } | |
1762 | if (ref_offset < root_objectid) | |
1763 | break; | |
1764 | } | |
1765 | } | |
1766 | ptr += btrfs_extent_inline_ref_size(type); | |
1767 | } | |
1768 | if (err == -ENOENT && insert) { | |
1769 | if (item_size + extra_size >= | |
1770 | BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { | |
1771 | err = -EAGAIN; | |
1772 | goto out; | |
1773 | } | |
1774 | /* | |
1775 | * To add new inline back ref, we have to make sure | |
1776 | * there is no corresponding back ref item. | |
1777 | * For simplicity, we just do not add new inline back | |
1778 | * ref if there is any kind of item for this block | |
1779 | */ | |
2c47e605 YZ |
1780 | if (find_next_key(path, 0, &key) == 0 && |
1781 | key.objectid == bytenr && | |
85d4198e | 1782 | key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { |
5d4f98a2 YZ |
1783 | err = -EAGAIN; |
1784 | goto out; | |
1785 | } | |
1786 | } | |
1787 | *ref_ret = (struct btrfs_extent_inline_ref *)ptr; | |
1788 | out: | |
85d4198e | 1789 | if (insert) { |
5d4f98a2 YZ |
1790 | path->keep_locks = 0; |
1791 | btrfs_unlock_up_safe(path, 1); | |
1792 | } | |
1793 | return err; | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * helper to add new inline back ref | |
1798 | */ | |
1799 | static noinline_for_stack | |
87bde3cd | 1800 | void setup_inline_extent_backref(struct btrfs_fs_info *fs_info, |
143bede5 JM |
1801 | struct btrfs_path *path, |
1802 | struct btrfs_extent_inline_ref *iref, | |
1803 | u64 parent, u64 root_objectid, | |
1804 | u64 owner, u64 offset, int refs_to_add, | |
1805 | struct btrfs_delayed_extent_op *extent_op) | |
5d4f98a2 YZ |
1806 | { |
1807 | struct extent_buffer *leaf; | |
1808 | struct btrfs_extent_item *ei; | |
1809 | unsigned long ptr; | |
1810 | unsigned long end; | |
1811 | unsigned long item_offset; | |
1812 | u64 refs; | |
1813 | int size; | |
1814 | int type; | |
5d4f98a2 YZ |
1815 | |
1816 | leaf = path->nodes[0]; | |
1817 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1818 | item_offset = (unsigned long)iref - (unsigned long)ei; | |
1819 | ||
1820 | type = extent_ref_type(parent, owner); | |
1821 | size = btrfs_extent_inline_ref_size(type); | |
1822 | ||
87bde3cd | 1823 | btrfs_extend_item(fs_info, path, size); |
5d4f98a2 YZ |
1824 | |
1825 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
1826 | refs = btrfs_extent_refs(leaf, ei); | |
1827 | refs += refs_to_add; | |
1828 | btrfs_set_extent_refs(leaf, ei, refs); | |
1829 | if (extent_op) | |
1830 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1831 | ||
1832 | ptr = (unsigned long)ei + item_offset; | |
1833 | end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]); | |
1834 | if (ptr < end - size) | |
1835 | memmove_extent_buffer(leaf, ptr + size, ptr, | |
1836 | end - size - ptr); | |
1837 | ||
1838 | iref = (struct btrfs_extent_inline_ref *)ptr; | |
1839 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
1840 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1841 | struct btrfs_extent_data_ref *dref; | |
1842 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1843 | btrfs_set_extent_data_ref_root(leaf, dref, root_objectid); | |
1844 | btrfs_set_extent_data_ref_objectid(leaf, dref, owner); | |
1845 | btrfs_set_extent_data_ref_offset(leaf, dref, offset); | |
1846 | btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add); | |
1847 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1848 | struct btrfs_shared_data_ref *sref; | |
1849 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1850 | btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add); | |
1851 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1852 | } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { | |
1853 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
1854 | } else { | |
1855 | btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); | |
1856 | } | |
1857 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1858 | } |
1859 | ||
1860 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
87bde3cd | 1861 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
1862 | struct btrfs_path *path, |
1863 | struct btrfs_extent_inline_ref **ref_ret, | |
1864 | u64 bytenr, u64 num_bytes, u64 parent, | |
1865 | u64 root_objectid, u64 owner, u64 offset) | |
1866 | { | |
1867 | int ret; | |
1868 | ||
867cc1fb NB |
1869 | ret = lookup_inline_extent_backref(trans, path, ref_ret, bytenr, |
1870 | num_bytes, parent, root_objectid, | |
1871 | owner, offset, 0); | |
5d4f98a2 | 1872 | if (ret != -ENOENT) |
54aa1f4d | 1873 | return ret; |
5d4f98a2 | 1874 | |
b3b4aa74 | 1875 | btrfs_release_path(path); |
5d4f98a2 YZ |
1876 | *ref_ret = NULL; |
1877 | ||
1878 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
b8582eea NB |
1879 | ret = lookup_tree_block_ref(trans, path, bytenr, parent, |
1880 | root_objectid); | |
5d4f98a2 | 1881 | } else { |
bd1d53ef NB |
1882 | ret = lookup_extent_data_ref(trans, path, bytenr, parent, |
1883 | root_objectid, owner, offset); | |
b9473439 | 1884 | } |
5d4f98a2 YZ |
1885 | return ret; |
1886 | } | |
31840ae1 | 1887 | |
5d4f98a2 YZ |
1888 | /* |
1889 | * helper to update/remove inline back ref | |
1890 | */ | |
1891 | static noinline_for_stack | |
61a18f1c | 1892 | void update_inline_extent_backref(struct btrfs_path *path, |
143bede5 JM |
1893 | struct btrfs_extent_inline_ref *iref, |
1894 | int refs_to_mod, | |
fcebe456 JB |
1895 | struct btrfs_delayed_extent_op *extent_op, |
1896 | int *last_ref) | |
5d4f98a2 | 1897 | { |
61a18f1c NB |
1898 | struct extent_buffer *leaf = path->nodes[0]; |
1899 | struct btrfs_fs_info *fs_info = leaf->fs_info; | |
5d4f98a2 YZ |
1900 | struct btrfs_extent_item *ei; |
1901 | struct btrfs_extent_data_ref *dref = NULL; | |
1902 | struct btrfs_shared_data_ref *sref = NULL; | |
1903 | unsigned long ptr; | |
1904 | unsigned long end; | |
1905 | u32 item_size; | |
1906 | int size; | |
1907 | int type; | |
5d4f98a2 YZ |
1908 | u64 refs; |
1909 | ||
5d4f98a2 YZ |
1910 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
1911 | refs = btrfs_extent_refs(leaf, ei); | |
1912 | WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0); | |
1913 | refs += refs_to_mod; | |
1914 | btrfs_set_extent_refs(leaf, ei, refs); | |
1915 | if (extent_op) | |
1916 | __run_delayed_extent_op(extent_op, leaf, ei); | |
1917 | ||
3de28d57 LB |
1918 | /* |
1919 | * If type is invalid, we should have bailed out after | |
1920 | * lookup_inline_extent_backref(). | |
1921 | */ | |
1922 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_ANY); | |
1923 | ASSERT(type != BTRFS_REF_TYPE_INVALID); | |
5d4f98a2 YZ |
1924 | |
1925 | if (type == BTRFS_EXTENT_DATA_REF_KEY) { | |
1926 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
1927 | refs = btrfs_extent_data_ref_count(leaf, dref); | |
1928 | } else if (type == BTRFS_SHARED_DATA_REF_KEY) { | |
1929 | sref = (struct btrfs_shared_data_ref *)(iref + 1); | |
1930 | refs = btrfs_shared_data_ref_count(leaf, sref); | |
1931 | } else { | |
1932 | refs = 1; | |
1933 | BUG_ON(refs_to_mod != -1); | |
56bec294 | 1934 | } |
31840ae1 | 1935 | |
5d4f98a2 YZ |
1936 | BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod); |
1937 | refs += refs_to_mod; | |
1938 | ||
1939 | if (refs > 0) { | |
1940 | if (type == BTRFS_EXTENT_DATA_REF_KEY) | |
1941 | btrfs_set_extent_data_ref_count(leaf, dref, refs); | |
1942 | else | |
1943 | btrfs_set_shared_data_ref_count(leaf, sref, refs); | |
1944 | } else { | |
fcebe456 | 1945 | *last_ref = 1; |
5d4f98a2 YZ |
1946 | size = btrfs_extent_inline_ref_size(type); |
1947 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1948 | ptr = (unsigned long)iref; | |
1949 | end = (unsigned long)ei + item_size; | |
1950 | if (ptr + size < end) | |
1951 | memmove_extent_buffer(leaf, ptr, ptr + size, | |
1952 | end - ptr - size); | |
1953 | item_size -= size; | |
87bde3cd | 1954 | btrfs_truncate_item(fs_info, path, item_size, 1); |
5d4f98a2 YZ |
1955 | } |
1956 | btrfs_mark_buffer_dirty(leaf); | |
5d4f98a2 YZ |
1957 | } |
1958 | ||
1959 | static noinline_for_stack | |
1960 | int insert_inline_extent_backref(struct btrfs_trans_handle *trans, | |
87bde3cd | 1961 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
1962 | struct btrfs_path *path, |
1963 | u64 bytenr, u64 num_bytes, u64 parent, | |
1964 | u64 root_objectid, u64 owner, | |
1965 | u64 offset, int refs_to_add, | |
1966 | struct btrfs_delayed_extent_op *extent_op) | |
1967 | { | |
1968 | struct btrfs_extent_inline_ref *iref; | |
1969 | int ret; | |
1970 | ||
867cc1fb NB |
1971 | ret = lookup_inline_extent_backref(trans, path, &iref, bytenr, |
1972 | num_bytes, parent, root_objectid, | |
1973 | owner, offset, 1); | |
5d4f98a2 YZ |
1974 | if (ret == 0) { |
1975 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID); | |
61a18f1c NB |
1976 | update_inline_extent_backref(path, iref, refs_to_add, |
1977 | extent_op, NULL); | |
5d4f98a2 | 1978 | } else if (ret == -ENOENT) { |
87bde3cd | 1979 | setup_inline_extent_backref(fs_info, path, iref, parent, |
143bede5 JM |
1980 | root_objectid, owner, offset, |
1981 | refs_to_add, extent_op); | |
1982 | ret = 0; | |
771ed689 | 1983 | } |
5d4f98a2 YZ |
1984 | return ret; |
1985 | } | |
31840ae1 | 1986 | |
5d4f98a2 | 1987 | static int insert_extent_backref(struct btrfs_trans_handle *trans, |
5d4f98a2 YZ |
1988 | struct btrfs_path *path, |
1989 | u64 bytenr, u64 parent, u64 root_objectid, | |
1990 | u64 owner, u64 offset, int refs_to_add) | |
1991 | { | |
1992 | int ret; | |
1993 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { | |
1994 | BUG_ON(refs_to_add != 1); | |
10728404 NB |
1995 | ret = insert_tree_block_ref(trans, path, bytenr, parent, |
1996 | root_objectid); | |
5d4f98a2 | 1997 | } else { |
62b895af NB |
1998 | ret = insert_extent_data_ref(trans, path, bytenr, parent, |
1999 | root_objectid, owner, offset, | |
2000 | refs_to_add); | |
5d4f98a2 YZ |
2001 | } |
2002 | return ret; | |
2003 | } | |
56bec294 | 2004 | |
5d4f98a2 | 2005 | static int remove_extent_backref(struct btrfs_trans_handle *trans, |
87bde3cd | 2006 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
2007 | struct btrfs_path *path, |
2008 | struct btrfs_extent_inline_ref *iref, | |
fcebe456 | 2009 | int refs_to_drop, int is_data, int *last_ref) |
5d4f98a2 | 2010 | { |
143bede5 | 2011 | int ret = 0; |
b9473439 | 2012 | |
5d4f98a2 YZ |
2013 | BUG_ON(!is_data && refs_to_drop != 1); |
2014 | if (iref) { | |
61a18f1c NB |
2015 | update_inline_extent_backref(path, iref, -refs_to_drop, NULL, |
2016 | last_ref); | |
5d4f98a2 | 2017 | } else if (is_data) { |
e9f6290d | 2018 | ret = remove_extent_data_ref(trans, path, refs_to_drop, |
fcebe456 | 2019 | last_ref); |
5d4f98a2 | 2020 | } else { |
fcebe456 | 2021 | *last_ref = 1; |
87bde3cd | 2022 | ret = btrfs_del_item(trans, fs_info->extent_root, path); |
5d4f98a2 YZ |
2023 | } |
2024 | return ret; | |
2025 | } | |
2026 | ||
86557861 | 2027 | #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) |
d04c6b88 JM |
2028 | static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len, |
2029 | u64 *discarded_bytes) | |
5d4f98a2 | 2030 | { |
86557861 JM |
2031 | int j, ret = 0; |
2032 | u64 bytes_left, end; | |
4d89d377 | 2033 | u64 aligned_start = ALIGN(start, 1 << 9); |
d04c6b88 | 2034 | |
4d89d377 JM |
2035 | if (WARN_ON(start != aligned_start)) { |
2036 | len -= aligned_start - start; | |
2037 | len = round_down(len, 1 << 9); | |
2038 | start = aligned_start; | |
2039 | } | |
d04c6b88 | 2040 | |
4d89d377 | 2041 | *discarded_bytes = 0; |
86557861 JM |
2042 | |
2043 | if (!len) | |
2044 | return 0; | |
2045 | ||
2046 | end = start + len; | |
2047 | bytes_left = len; | |
2048 | ||
2049 | /* Skip any superblocks on this device. */ | |
2050 | for (j = 0; j < BTRFS_SUPER_MIRROR_MAX; j++) { | |
2051 | u64 sb_start = btrfs_sb_offset(j); | |
2052 | u64 sb_end = sb_start + BTRFS_SUPER_INFO_SIZE; | |
2053 | u64 size = sb_start - start; | |
2054 | ||
2055 | if (!in_range(sb_start, start, bytes_left) && | |
2056 | !in_range(sb_end, start, bytes_left) && | |
2057 | !in_range(start, sb_start, BTRFS_SUPER_INFO_SIZE)) | |
2058 | continue; | |
2059 | ||
2060 | /* | |
2061 | * Superblock spans beginning of range. Adjust start and | |
2062 | * try again. | |
2063 | */ | |
2064 | if (sb_start <= start) { | |
2065 | start += sb_end - start; | |
2066 | if (start > end) { | |
2067 | bytes_left = 0; | |
2068 | break; | |
2069 | } | |
2070 | bytes_left = end - start; | |
2071 | continue; | |
2072 | } | |
2073 | ||
2074 | if (size) { | |
2075 | ret = blkdev_issue_discard(bdev, start >> 9, size >> 9, | |
2076 | GFP_NOFS, 0); | |
2077 | if (!ret) | |
2078 | *discarded_bytes += size; | |
2079 | else if (ret != -EOPNOTSUPP) | |
2080 | return ret; | |
2081 | } | |
2082 | ||
2083 | start = sb_end; | |
2084 | if (start > end) { | |
2085 | bytes_left = 0; | |
2086 | break; | |
2087 | } | |
2088 | bytes_left = end - start; | |
2089 | } | |
2090 | ||
2091 | if (bytes_left) { | |
2092 | ret = blkdev_issue_discard(bdev, start >> 9, bytes_left >> 9, | |
4d89d377 JM |
2093 | GFP_NOFS, 0); |
2094 | if (!ret) | |
86557861 | 2095 | *discarded_bytes += bytes_left; |
4d89d377 | 2096 | } |
d04c6b88 | 2097 | return ret; |
5d4f98a2 | 2098 | } |
5d4f98a2 | 2099 | |
2ff7e61e | 2100 | int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr, |
1edb647b | 2101 | u64 num_bytes, u64 *actual_bytes) |
5d4f98a2 | 2102 | { |
5d4f98a2 | 2103 | int ret; |
5378e607 | 2104 | u64 discarded_bytes = 0; |
a1d3c478 | 2105 | struct btrfs_bio *bbio = NULL; |
5d4f98a2 | 2106 | |
e244a0ae | 2107 | |
2999241d FM |
2108 | /* |
2109 | * Avoid races with device replace and make sure our bbio has devices | |
2110 | * associated to its stripes that don't go away while we are discarding. | |
2111 | */ | |
0b246afa | 2112 | btrfs_bio_counter_inc_blocked(fs_info); |
5d4f98a2 | 2113 | /* Tell the block device(s) that the sectors can be discarded */ |
0b246afa JM |
2114 | ret = btrfs_map_block(fs_info, BTRFS_MAP_DISCARD, bytenr, &num_bytes, |
2115 | &bbio, 0); | |
79787eaa | 2116 | /* Error condition is -ENOMEM */ |
5d4f98a2 | 2117 | if (!ret) { |
a1d3c478 | 2118 | struct btrfs_bio_stripe *stripe = bbio->stripes; |
5d4f98a2 YZ |
2119 | int i; |
2120 | ||
5d4f98a2 | 2121 | |
a1d3c478 | 2122 | for (i = 0; i < bbio->num_stripes; i++, stripe++) { |
d04c6b88 | 2123 | u64 bytes; |
38b5f68e AJ |
2124 | struct request_queue *req_q; |
2125 | ||
627e0873 FM |
2126 | if (!stripe->dev->bdev) { |
2127 | ASSERT(btrfs_test_opt(fs_info, DEGRADED)); | |
2128 | continue; | |
2129 | } | |
38b5f68e AJ |
2130 | req_q = bdev_get_queue(stripe->dev->bdev); |
2131 | if (!blk_queue_discard(req_q)) | |
d5e2003c JB |
2132 | continue; |
2133 | ||
5378e607 LD |
2134 | ret = btrfs_issue_discard(stripe->dev->bdev, |
2135 | stripe->physical, | |
d04c6b88 JM |
2136 | stripe->length, |
2137 | &bytes); | |
5378e607 | 2138 | if (!ret) |
d04c6b88 | 2139 | discarded_bytes += bytes; |
5378e607 | 2140 | else if (ret != -EOPNOTSUPP) |
79787eaa | 2141 | break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */ |
d5e2003c JB |
2142 | |
2143 | /* | |
2144 | * Just in case we get back EOPNOTSUPP for some reason, | |
2145 | * just ignore the return value so we don't screw up | |
2146 | * people calling discard_extent. | |
2147 | */ | |
2148 | ret = 0; | |
5d4f98a2 | 2149 | } |
6e9606d2 | 2150 | btrfs_put_bbio(bbio); |
5d4f98a2 | 2151 | } |
0b246afa | 2152 | btrfs_bio_counter_dec(fs_info); |
5378e607 LD |
2153 | |
2154 | if (actual_bytes) | |
2155 | *actual_bytes = discarded_bytes; | |
2156 | ||
5d4f98a2 | 2157 | |
53b381b3 DW |
2158 | if (ret == -EOPNOTSUPP) |
2159 | ret = 0; | |
5d4f98a2 | 2160 | return ret; |
5d4f98a2 YZ |
2161 | } |
2162 | ||
79787eaa | 2163 | /* Can return -ENOMEM */ |
5d4f98a2 | 2164 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
84f7d8e6 | 2165 | struct btrfs_root *root, |
5d4f98a2 | 2166 | u64 bytenr, u64 num_bytes, u64 parent, |
b06c4bf5 | 2167 | u64 root_objectid, u64 owner, u64 offset) |
5d4f98a2 | 2168 | { |
84f7d8e6 | 2169 | struct btrfs_fs_info *fs_info = root->fs_info; |
d7eae340 | 2170 | int old_ref_mod, new_ref_mod; |
5d4f98a2 | 2171 | int ret; |
66d7e7f0 | 2172 | |
5d4f98a2 YZ |
2173 | BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && |
2174 | root_objectid == BTRFS_TREE_LOG_OBJECTID); | |
2175 | ||
fd708b81 JB |
2176 | btrfs_ref_tree_mod(root, bytenr, num_bytes, parent, root_objectid, |
2177 | owner, offset, BTRFS_ADD_DELAYED_REF); | |
2178 | ||
5d4f98a2 | 2179 | if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 | 2180 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
7be07912 OS |
2181 | num_bytes, parent, |
2182 | root_objectid, (int)owner, | |
2183 | BTRFS_ADD_DELAYED_REF, NULL, | |
d7eae340 | 2184 | &old_ref_mod, &new_ref_mod); |
5d4f98a2 | 2185 | } else { |
66d7e7f0 | 2186 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
7be07912 OS |
2187 | num_bytes, parent, |
2188 | root_objectid, owner, offset, | |
d7eae340 OS |
2189 | 0, BTRFS_ADD_DELAYED_REF, |
2190 | &old_ref_mod, &new_ref_mod); | |
5d4f98a2 | 2191 | } |
d7eae340 | 2192 | |
29d2b84c NB |
2193 | if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) { |
2194 | bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID; | |
2195 | ||
2196 | add_pinned_bytes(fs_info, -num_bytes, metadata, root_objectid); | |
2197 | } | |
d7eae340 | 2198 | |
5d4f98a2 YZ |
2199 | return ret; |
2200 | } | |
2201 | ||
bd3c685e NB |
2202 | /* |
2203 | * __btrfs_inc_extent_ref - insert backreference for a given extent | |
2204 | * | |
2205 | * @trans: Handle of transaction | |
2206 | * | |
2207 | * @node: The delayed ref node used to get the bytenr/length for | |
2208 | * extent whose references are incremented. | |
2209 | * | |
2210 | * @parent: If this is a shared extent (BTRFS_SHARED_DATA_REF_KEY/ | |
2211 | * BTRFS_SHARED_BLOCK_REF_KEY) then it holds the logical | |
2212 | * bytenr of the parent block. Since new extents are always | |
2213 | * created with indirect references, this will only be the case | |
2214 | * when relocating a shared extent. In that case, root_objectid | |
2215 | * will be BTRFS_TREE_RELOC_OBJECTID. Otheriwse, parent must | |
2216 | * be 0 | |
2217 | * | |
2218 | * @root_objectid: The id of the root where this modification has originated, | |
2219 | * this can be either one of the well-known metadata trees or | |
2220 | * the subvolume id which references this extent. | |
2221 | * | |
2222 | * @owner: For data extents it is the inode number of the owning file. | |
2223 | * For metadata extents this parameter holds the level in the | |
2224 | * tree of the extent. | |
2225 | * | |
2226 | * @offset: For metadata extents the offset is ignored and is currently | |
2227 | * always passed as 0. For data extents it is the fileoffset | |
2228 | * this extent belongs to. | |
2229 | * | |
2230 | * @refs_to_add Number of references to add | |
2231 | * | |
2232 | * @extent_op Pointer to a structure, holding information necessary when | |
2233 | * updating a tree block's flags | |
2234 | * | |
2235 | */ | |
5d4f98a2 | 2236 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
2ff7e61e | 2237 | struct btrfs_fs_info *fs_info, |
c682f9b3 | 2238 | struct btrfs_delayed_ref_node *node, |
5d4f98a2 YZ |
2239 | u64 parent, u64 root_objectid, |
2240 | u64 owner, u64 offset, int refs_to_add, | |
2241 | struct btrfs_delayed_extent_op *extent_op) | |
2242 | { | |
2243 | struct btrfs_path *path; | |
2244 | struct extent_buffer *leaf; | |
2245 | struct btrfs_extent_item *item; | |
fcebe456 | 2246 | struct btrfs_key key; |
c682f9b3 QW |
2247 | u64 bytenr = node->bytenr; |
2248 | u64 num_bytes = node->num_bytes; | |
5d4f98a2 YZ |
2249 | u64 refs; |
2250 | int ret; | |
5d4f98a2 YZ |
2251 | |
2252 | path = btrfs_alloc_path(); | |
2253 | if (!path) | |
2254 | return -ENOMEM; | |
2255 | ||
e4058b54 | 2256 | path->reada = READA_FORWARD; |
5d4f98a2 YZ |
2257 | path->leave_spinning = 1; |
2258 | /* this will setup the path even if it fails to insert the back ref */ | |
87bde3cd JM |
2259 | ret = insert_inline_extent_backref(trans, fs_info, path, bytenr, |
2260 | num_bytes, parent, root_objectid, | |
2261 | owner, offset, | |
5d4f98a2 | 2262 | refs_to_add, extent_op); |
0ed4792a | 2263 | if ((ret < 0 && ret != -EAGAIN) || !ret) |
5d4f98a2 | 2264 | goto out; |
fcebe456 JB |
2265 | |
2266 | /* | |
2267 | * Ok we had -EAGAIN which means we didn't have space to insert and | |
2268 | * inline extent ref, so just update the reference count and add a | |
2269 | * normal backref. | |
2270 | */ | |
5d4f98a2 | 2271 | leaf = path->nodes[0]; |
fcebe456 | 2272 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
5d4f98a2 YZ |
2273 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); |
2274 | refs = btrfs_extent_refs(leaf, item); | |
2275 | btrfs_set_extent_refs(leaf, item, refs + refs_to_add); | |
2276 | if (extent_op) | |
2277 | __run_delayed_extent_op(extent_op, leaf, item); | |
56bec294 | 2278 | |
5d4f98a2 | 2279 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 2280 | btrfs_release_path(path); |
56bec294 | 2281 | |
e4058b54 | 2282 | path->reada = READA_FORWARD; |
b9473439 | 2283 | path->leave_spinning = 1; |
56bec294 | 2284 | /* now insert the actual backref */ |
37593410 NB |
2285 | ret = insert_extent_backref(trans, path, bytenr, parent, root_objectid, |
2286 | owner, offset, refs_to_add); | |
79787eaa | 2287 | if (ret) |
66642832 | 2288 | btrfs_abort_transaction(trans, ret); |
5d4f98a2 | 2289 | out: |
56bec294 | 2290 | btrfs_free_path(path); |
30d133fc | 2291 | return ret; |
56bec294 CM |
2292 | } |
2293 | ||
5d4f98a2 | 2294 | static int run_delayed_data_ref(struct btrfs_trans_handle *trans, |
2ff7e61e | 2295 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
2296 | struct btrfs_delayed_ref_node *node, |
2297 | struct btrfs_delayed_extent_op *extent_op, | |
2298 | int insert_reserved) | |
56bec294 | 2299 | { |
5d4f98a2 YZ |
2300 | int ret = 0; |
2301 | struct btrfs_delayed_data_ref *ref; | |
2302 | struct btrfs_key ins; | |
2303 | u64 parent = 0; | |
2304 | u64 ref_root = 0; | |
2305 | u64 flags = 0; | |
2306 | ||
2307 | ins.objectid = node->bytenr; | |
2308 | ins.offset = node->num_bytes; | |
2309 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
2310 | ||
2311 | ref = btrfs_delayed_node_to_data_ref(node); | |
0b246afa | 2312 | trace_run_delayed_data_ref(fs_info, node, ref, node->action); |
599c75ec | 2313 | |
5d4f98a2 YZ |
2314 | if (node->type == BTRFS_SHARED_DATA_REF_KEY) |
2315 | parent = ref->parent; | |
fcebe456 | 2316 | ref_root = ref->root; |
5d4f98a2 YZ |
2317 | |
2318 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { | |
3173a18f | 2319 | if (extent_op) |
5d4f98a2 | 2320 | flags |= extent_op->flags_to_set; |
2ff7e61e | 2321 | ret = alloc_reserved_file_extent(trans, fs_info, |
5d4f98a2 YZ |
2322 | parent, ref_root, flags, |
2323 | ref->objectid, ref->offset, | |
2324 | &ins, node->ref_mod); | |
5d4f98a2 | 2325 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2ff7e61e | 2326 | ret = __btrfs_inc_extent_ref(trans, fs_info, node, parent, |
5d4f98a2 YZ |
2327 | ref_root, ref->objectid, |
2328 | ref->offset, node->ref_mod, | |
c682f9b3 | 2329 | extent_op); |
5d4f98a2 | 2330 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
2ff7e61e | 2331 | ret = __btrfs_free_extent(trans, fs_info, node, parent, |
5d4f98a2 YZ |
2332 | ref_root, ref->objectid, |
2333 | ref->offset, node->ref_mod, | |
c682f9b3 | 2334 | extent_op); |
5d4f98a2 YZ |
2335 | } else { |
2336 | BUG(); | |
2337 | } | |
2338 | return ret; | |
2339 | } | |
2340 | ||
2341 | static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op, | |
2342 | struct extent_buffer *leaf, | |
2343 | struct btrfs_extent_item *ei) | |
2344 | { | |
2345 | u64 flags = btrfs_extent_flags(leaf, ei); | |
2346 | if (extent_op->update_flags) { | |
2347 | flags |= extent_op->flags_to_set; | |
2348 | btrfs_set_extent_flags(leaf, ei, flags); | |
2349 | } | |
2350 | ||
2351 | if (extent_op->update_key) { | |
2352 | struct btrfs_tree_block_info *bi; | |
2353 | BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); | |
2354 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
2355 | btrfs_set_tree_block_key(leaf, bi, &extent_op->key); | |
2356 | } | |
2357 | } | |
2358 | ||
2359 | static int run_delayed_extent_op(struct btrfs_trans_handle *trans, | |
2ff7e61e | 2360 | struct btrfs_fs_info *fs_info, |
d278850e | 2361 | struct btrfs_delayed_ref_head *head, |
5d4f98a2 YZ |
2362 | struct btrfs_delayed_extent_op *extent_op) |
2363 | { | |
2364 | struct btrfs_key key; | |
2365 | struct btrfs_path *path; | |
2366 | struct btrfs_extent_item *ei; | |
2367 | struct extent_buffer *leaf; | |
2368 | u32 item_size; | |
56bec294 | 2369 | int ret; |
5d4f98a2 | 2370 | int err = 0; |
b1c79e09 | 2371 | int metadata = !extent_op->is_data; |
5d4f98a2 | 2372 | |
79787eaa JM |
2373 | if (trans->aborted) |
2374 | return 0; | |
2375 | ||
0b246afa | 2376 | if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3173a18f JB |
2377 | metadata = 0; |
2378 | ||
5d4f98a2 YZ |
2379 | path = btrfs_alloc_path(); |
2380 | if (!path) | |
2381 | return -ENOMEM; | |
2382 | ||
d278850e | 2383 | key.objectid = head->bytenr; |
5d4f98a2 | 2384 | |
3173a18f | 2385 | if (metadata) { |
3173a18f | 2386 | key.type = BTRFS_METADATA_ITEM_KEY; |
b1c79e09 | 2387 | key.offset = extent_op->level; |
3173a18f JB |
2388 | } else { |
2389 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
d278850e | 2390 | key.offset = head->num_bytes; |
3173a18f JB |
2391 | } |
2392 | ||
2393 | again: | |
e4058b54 | 2394 | path->reada = READA_FORWARD; |
5d4f98a2 | 2395 | path->leave_spinning = 1; |
0b246afa | 2396 | ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1); |
5d4f98a2 YZ |
2397 | if (ret < 0) { |
2398 | err = ret; | |
2399 | goto out; | |
2400 | } | |
2401 | if (ret > 0) { | |
3173a18f | 2402 | if (metadata) { |
55994887 FDBM |
2403 | if (path->slots[0] > 0) { |
2404 | path->slots[0]--; | |
2405 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
2406 | path->slots[0]); | |
d278850e | 2407 | if (key.objectid == head->bytenr && |
55994887 | 2408 | key.type == BTRFS_EXTENT_ITEM_KEY && |
d278850e | 2409 | key.offset == head->num_bytes) |
55994887 FDBM |
2410 | ret = 0; |
2411 | } | |
2412 | if (ret > 0) { | |
2413 | btrfs_release_path(path); | |
2414 | metadata = 0; | |
3173a18f | 2415 | |
d278850e JB |
2416 | key.objectid = head->bytenr; |
2417 | key.offset = head->num_bytes; | |
55994887 FDBM |
2418 | key.type = BTRFS_EXTENT_ITEM_KEY; |
2419 | goto again; | |
2420 | } | |
2421 | } else { | |
2422 | err = -EIO; | |
2423 | goto out; | |
3173a18f | 2424 | } |
5d4f98a2 YZ |
2425 | } |
2426 | ||
2427 | leaf = path->nodes[0]; | |
2428 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2429 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
2430 | if (item_size < sizeof(*ei)) { | |
87bde3cd | 2431 | ret = convert_extent_item_v0(trans, fs_info, path, (u64)-1, 0); |
5d4f98a2 YZ |
2432 | if (ret < 0) { |
2433 | err = ret; | |
2434 | goto out; | |
2435 | } | |
2436 | leaf = path->nodes[0]; | |
2437 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2438 | } | |
2439 | #endif | |
2440 | BUG_ON(item_size < sizeof(*ei)); | |
2441 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
2442 | __run_delayed_extent_op(extent_op, leaf, ei); | |
56bec294 | 2443 | |
5d4f98a2 YZ |
2444 | btrfs_mark_buffer_dirty(leaf); |
2445 | out: | |
2446 | btrfs_free_path(path); | |
2447 | return err; | |
56bec294 CM |
2448 | } |
2449 | ||
5d4f98a2 | 2450 | static int run_delayed_tree_ref(struct btrfs_trans_handle *trans, |
2ff7e61e | 2451 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
2452 | struct btrfs_delayed_ref_node *node, |
2453 | struct btrfs_delayed_extent_op *extent_op, | |
2454 | int insert_reserved) | |
56bec294 CM |
2455 | { |
2456 | int ret = 0; | |
5d4f98a2 | 2457 | struct btrfs_delayed_tree_ref *ref; |
5d4f98a2 YZ |
2458 | u64 parent = 0; |
2459 | u64 ref_root = 0; | |
56bec294 | 2460 | |
5d4f98a2 | 2461 | ref = btrfs_delayed_node_to_tree_ref(node); |
0b246afa | 2462 | trace_run_delayed_tree_ref(fs_info, node, ref, node->action); |
599c75ec | 2463 | |
5d4f98a2 YZ |
2464 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) |
2465 | parent = ref->parent; | |
fcebe456 | 2466 | ref_root = ref->root; |
5d4f98a2 | 2467 | |
02794222 | 2468 | if (node->ref_mod != 1) { |
2ff7e61e | 2469 | btrfs_err(fs_info, |
02794222 LB |
2470 | "btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu", |
2471 | node->bytenr, node->ref_mod, node->action, ref_root, | |
2472 | parent); | |
2473 | return -EIO; | |
2474 | } | |
5d4f98a2 | 2475 | if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) { |
3173a18f | 2476 | BUG_ON(!extent_op || !extent_op->update_flags); |
21ebfbe7 | 2477 | ret = alloc_reserved_tree_block(trans, node, extent_op); |
5d4f98a2 | 2478 | } else if (node->action == BTRFS_ADD_DELAYED_REF) { |
2ff7e61e | 2479 | ret = __btrfs_inc_extent_ref(trans, fs_info, node, |
c682f9b3 QW |
2480 | parent, ref_root, |
2481 | ref->level, 0, 1, | |
fcebe456 | 2482 | extent_op); |
5d4f98a2 | 2483 | } else if (node->action == BTRFS_DROP_DELAYED_REF) { |
2ff7e61e | 2484 | ret = __btrfs_free_extent(trans, fs_info, node, |
c682f9b3 QW |
2485 | parent, ref_root, |
2486 | ref->level, 0, 1, extent_op); | |
5d4f98a2 YZ |
2487 | } else { |
2488 | BUG(); | |
2489 | } | |
56bec294 CM |
2490 | return ret; |
2491 | } | |
2492 | ||
2493 | /* helper function to actually process a single delayed ref entry */ | |
5d4f98a2 | 2494 | static int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
2ff7e61e | 2495 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
2496 | struct btrfs_delayed_ref_node *node, |
2497 | struct btrfs_delayed_extent_op *extent_op, | |
2498 | int insert_reserved) | |
56bec294 | 2499 | { |
79787eaa JM |
2500 | int ret = 0; |
2501 | ||
857cc2fc JB |
2502 | if (trans->aborted) { |
2503 | if (insert_reserved) | |
2ff7e61e | 2504 | btrfs_pin_extent(fs_info, node->bytenr, |
857cc2fc | 2505 | node->num_bytes, 1); |
79787eaa | 2506 | return 0; |
857cc2fc | 2507 | } |
79787eaa | 2508 | |
5d4f98a2 YZ |
2509 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
2510 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) | |
2ff7e61e | 2511 | ret = run_delayed_tree_ref(trans, fs_info, node, extent_op, |
5d4f98a2 YZ |
2512 | insert_reserved); |
2513 | else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || | |
2514 | node->type == BTRFS_SHARED_DATA_REF_KEY) | |
2ff7e61e | 2515 | ret = run_delayed_data_ref(trans, fs_info, node, extent_op, |
5d4f98a2 YZ |
2516 | insert_reserved); |
2517 | else | |
2518 | BUG(); | |
2519 | return ret; | |
56bec294 CM |
2520 | } |
2521 | ||
c6fc2454 | 2522 | static inline struct btrfs_delayed_ref_node * |
56bec294 CM |
2523 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
2524 | { | |
cffc3374 FM |
2525 | struct btrfs_delayed_ref_node *ref; |
2526 | ||
0e0adbcf | 2527 | if (RB_EMPTY_ROOT(&head->ref_tree)) |
c6fc2454 | 2528 | return NULL; |
d7df2c79 | 2529 | |
cffc3374 FM |
2530 | /* |
2531 | * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first. | |
2532 | * This is to prevent a ref count from going down to zero, which deletes | |
2533 | * the extent item from the extent tree, when there still are references | |
2534 | * to add, which would fail because they would not find the extent item. | |
2535 | */ | |
1d57ee94 WX |
2536 | if (!list_empty(&head->ref_add_list)) |
2537 | return list_first_entry(&head->ref_add_list, | |
2538 | struct btrfs_delayed_ref_node, add_list); | |
2539 | ||
0e0adbcf JB |
2540 | ref = rb_entry(rb_first(&head->ref_tree), |
2541 | struct btrfs_delayed_ref_node, ref_node); | |
1d57ee94 WX |
2542 | ASSERT(list_empty(&ref->add_list)); |
2543 | return ref; | |
56bec294 CM |
2544 | } |
2545 | ||
2eadaa22 JB |
2546 | static void unselect_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, |
2547 | struct btrfs_delayed_ref_head *head) | |
2548 | { | |
2549 | spin_lock(&delayed_refs->lock); | |
2550 | head->processing = 0; | |
2551 | delayed_refs->num_heads_ready++; | |
2552 | spin_unlock(&delayed_refs->lock); | |
2553 | btrfs_delayed_ref_unlock(head); | |
2554 | } | |
2555 | ||
b00e6250 JB |
2556 | static int cleanup_extent_op(struct btrfs_trans_handle *trans, |
2557 | struct btrfs_fs_info *fs_info, | |
2558 | struct btrfs_delayed_ref_head *head) | |
2559 | { | |
2560 | struct btrfs_delayed_extent_op *extent_op = head->extent_op; | |
2561 | int ret; | |
2562 | ||
2563 | if (!extent_op) | |
2564 | return 0; | |
2565 | head->extent_op = NULL; | |
2566 | if (head->must_insert_reserved) { | |
2567 | btrfs_free_delayed_extent_op(extent_op); | |
2568 | return 0; | |
2569 | } | |
2570 | spin_unlock(&head->lock); | |
d278850e | 2571 | ret = run_delayed_extent_op(trans, fs_info, head, extent_op); |
b00e6250 JB |
2572 | btrfs_free_delayed_extent_op(extent_op); |
2573 | return ret ? ret : 1; | |
2574 | } | |
2575 | ||
194ab0bc JB |
2576 | static int cleanup_ref_head(struct btrfs_trans_handle *trans, |
2577 | struct btrfs_fs_info *fs_info, | |
2578 | struct btrfs_delayed_ref_head *head) | |
2579 | { | |
2580 | struct btrfs_delayed_ref_root *delayed_refs; | |
2581 | int ret; | |
2582 | ||
2583 | delayed_refs = &trans->transaction->delayed_refs; | |
2584 | ||
2585 | ret = cleanup_extent_op(trans, fs_info, head); | |
2586 | if (ret < 0) { | |
2587 | unselect_delayed_ref_head(delayed_refs, head); | |
2588 | btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret); | |
2589 | return ret; | |
2590 | } else if (ret) { | |
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * Need to drop our head ref lock and re-acquire the delayed ref lock | |
2596 | * and then re-check to make sure nobody got added. | |
2597 | */ | |
2598 | spin_unlock(&head->lock); | |
2599 | spin_lock(&delayed_refs->lock); | |
2600 | spin_lock(&head->lock); | |
0e0adbcf | 2601 | if (!RB_EMPTY_ROOT(&head->ref_tree) || head->extent_op) { |
194ab0bc JB |
2602 | spin_unlock(&head->lock); |
2603 | spin_unlock(&delayed_refs->lock); | |
2604 | return 1; | |
2605 | } | |
194ab0bc JB |
2606 | delayed_refs->num_heads--; |
2607 | rb_erase(&head->href_node, &delayed_refs->href_root); | |
d278850e | 2608 | RB_CLEAR_NODE(&head->href_node); |
c1103f7a | 2609 | spin_unlock(&head->lock); |
1e7a1421 | 2610 | spin_unlock(&delayed_refs->lock); |
c1103f7a JB |
2611 | atomic_dec(&delayed_refs->num_entries); |
2612 | ||
d278850e | 2613 | trace_run_delayed_ref_head(fs_info, head, 0); |
c1103f7a JB |
2614 | |
2615 | if (head->total_ref_mod < 0) { | |
5e388e95 NB |
2616 | struct btrfs_space_info *space_info; |
2617 | u64 flags; | |
c1103f7a | 2618 | |
5e388e95 NB |
2619 | if (head->is_data) |
2620 | flags = BTRFS_BLOCK_GROUP_DATA; | |
2621 | else if (head->is_system) | |
2622 | flags = BTRFS_BLOCK_GROUP_SYSTEM; | |
2623 | else | |
2624 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
2625 | space_info = __find_space_info(fs_info, flags); | |
2626 | ASSERT(space_info); | |
2627 | percpu_counter_add(&space_info->total_bytes_pinned, | |
d278850e | 2628 | -head->num_bytes); |
c1103f7a JB |
2629 | |
2630 | if (head->is_data) { | |
2631 | spin_lock(&delayed_refs->lock); | |
d278850e | 2632 | delayed_refs->pending_csums -= head->num_bytes; |
c1103f7a JB |
2633 | spin_unlock(&delayed_refs->lock); |
2634 | } | |
2635 | } | |
2636 | ||
2637 | if (head->must_insert_reserved) { | |
d278850e JB |
2638 | btrfs_pin_extent(fs_info, head->bytenr, |
2639 | head->num_bytes, 1); | |
c1103f7a | 2640 | if (head->is_data) { |
d278850e JB |
2641 | ret = btrfs_del_csums(trans, fs_info, head->bytenr, |
2642 | head->num_bytes); | |
c1103f7a JB |
2643 | } |
2644 | } | |
2645 | ||
2646 | /* Also free its reserved qgroup space */ | |
2647 | btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root, | |
2648 | head->qgroup_reserved); | |
2649 | btrfs_delayed_ref_unlock(head); | |
d278850e | 2650 | btrfs_put_delayed_ref_head(head); |
194ab0bc JB |
2651 | return 0; |
2652 | } | |
2653 | ||
79787eaa JM |
2654 | /* |
2655 | * Returns 0 on success or if called with an already aborted transaction. | |
2656 | * Returns -ENOMEM or -EIO on failure and will abort the transaction. | |
2657 | */ | |
d7df2c79 | 2658 | static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
d7df2c79 | 2659 | unsigned long nr) |
56bec294 | 2660 | { |
0a1e458a | 2661 | struct btrfs_fs_info *fs_info = trans->fs_info; |
56bec294 CM |
2662 | struct btrfs_delayed_ref_root *delayed_refs; |
2663 | struct btrfs_delayed_ref_node *ref; | |
2664 | struct btrfs_delayed_ref_head *locked_ref = NULL; | |
5d4f98a2 | 2665 | struct btrfs_delayed_extent_op *extent_op; |
0a2b2a84 | 2666 | ktime_t start = ktime_get(); |
56bec294 | 2667 | int ret; |
d7df2c79 | 2668 | unsigned long count = 0; |
0a2b2a84 | 2669 | unsigned long actual_count = 0; |
56bec294 | 2670 | int must_insert_reserved = 0; |
56bec294 CM |
2671 | |
2672 | delayed_refs = &trans->transaction->delayed_refs; | |
56bec294 CM |
2673 | while (1) { |
2674 | if (!locked_ref) { | |
d7df2c79 | 2675 | if (count >= nr) |
56bec294 | 2676 | break; |
56bec294 | 2677 | |
d7df2c79 JB |
2678 | spin_lock(&delayed_refs->lock); |
2679 | locked_ref = btrfs_select_ref_head(trans); | |
2680 | if (!locked_ref) { | |
2681 | spin_unlock(&delayed_refs->lock); | |
2682 | break; | |
2683 | } | |
c3e69d58 CM |
2684 | |
2685 | /* grab the lock that says we are going to process | |
2686 | * all the refs for this head */ | |
2687 | ret = btrfs_delayed_ref_lock(trans, locked_ref); | |
d7df2c79 | 2688 | spin_unlock(&delayed_refs->lock); |
c3e69d58 CM |
2689 | /* |
2690 | * we may have dropped the spin lock to get the head | |
2691 | * mutex lock, and that might have given someone else | |
2692 | * time to free the head. If that's true, it has been | |
2693 | * removed from our list and we can move on. | |
2694 | */ | |
2695 | if (ret == -EAGAIN) { | |
2696 | locked_ref = NULL; | |
2697 | count++; | |
2698 | continue; | |
56bec294 CM |
2699 | } |
2700 | } | |
a28ec197 | 2701 | |
2c3cf7d5 FM |
2702 | /* |
2703 | * We need to try and merge add/drops of the same ref since we | |
2704 | * can run into issues with relocate dropping the implicit ref | |
2705 | * and then it being added back again before the drop can | |
2706 | * finish. If we merged anything we need to re-loop so we can | |
2707 | * get a good ref. | |
2708 | * Or we can get node references of the same type that weren't | |
2709 | * merged when created due to bumps in the tree mod seq, and | |
2710 | * we need to merge them to prevent adding an inline extent | |
2711 | * backref before dropping it (triggering a BUG_ON at | |
2712 | * insert_inline_extent_backref()). | |
2713 | */ | |
d7df2c79 | 2714 | spin_lock(&locked_ref->lock); |
be97f133 | 2715 | btrfs_merge_delayed_refs(trans, delayed_refs, locked_ref); |
ae1e206b | 2716 | |
d1270cd9 AJ |
2717 | ref = select_delayed_ref(locked_ref); |
2718 | ||
2719 | if (ref && ref->seq && | |
41d0bd3b | 2720 | btrfs_check_delayed_seq(fs_info, ref->seq)) { |
d7df2c79 | 2721 | spin_unlock(&locked_ref->lock); |
2eadaa22 | 2722 | unselect_delayed_ref_head(delayed_refs, locked_ref); |
d7df2c79 | 2723 | locked_ref = NULL; |
d1270cd9 | 2724 | cond_resched(); |
27a377db | 2725 | count++; |
d1270cd9 AJ |
2726 | continue; |
2727 | } | |
2728 | ||
c1103f7a JB |
2729 | /* |
2730 | * We're done processing refs in this ref_head, clean everything | |
2731 | * up and move on to the next ref_head. | |
2732 | */ | |
56bec294 | 2733 | if (!ref) { |
194ab0bc JB |
2734 | ret = cleanup_ref_head(trans, fs_info, locked_ref); |
2735 | if (ret > 0 ) { | |
b00e6250 JB |
2736 | /* We dropped our lock, we need to loop. */ |
2737 | ret = 0; | |
d7df2c79 | 2738 | continue; |
194ab0bc JB |
2739 | } else if (ret) { |
2740 | return ret; | |
5d4f98a2 | 2741 | } |
c1103f7a JB |
2742 | locked_ref = NULL; |
2743 | count++; | |
2744 | continue; | |
2745 | } | |
02217ed2 | 2746 | |
c1103f7a JB |
2747 | actual_count++; |
2748 | ref->in_tree = 0; | |
0e0adbcf JB |
2749 | rb_erase(&ref->ref_node, &locked_ref->ref_tree); |
2750 | RB_CLEAR_NODE(&ref->ref_node); | |
c1103f7a JB |
2751 | if (!list_empty(&ref->add_list)) |
2752 | list_del(&ref->add_list); | |
2753 | /* | |
2754 | * When we play the delayed ref, also correct the ref_mod on | |
2755 | * head | |
2756 | */ | |
2757 | switch (ref->action) { | |
2758 | case BTRFS_ADD_DELAYED_REF: | |
2759 | case BTRFS_ADD_DELAYED_EXTENT: | |
d278850e | 2760 | locked_ref->ref_mod -= ref->ref_mod; |
c1103f7a JB |
2761 | break; |
2762 | case BTRFS_DROP_DELAYED_REF: | |
d278850e | 2763 | locked_ref->ref_mod += ref->ref_mod; |
c1103f7a JB |
2764 | break; |
2765 | default: | |
2766 | WARN_ON(1); | |
22cd2e7d | 2767 | } |
1ce7a5ec JB |
2768 | atomic_dec(&delayed_refs->num_entries); |
2769 | ||
b00e6250 JB |
2770 | /* |
2771 | * Record the must-insert_reserved flag before we drop the spin | |
2772 | * lock. | |
2773 | */ | |
2774 | must_insert_reserved = locked_ref->must_insert_reserved; | |
2775 | locked_ref->must_insert_reserved = 0; | |
2776 | ||
2777 | extent_op = locked_ref->extent_op; | |
2778 | locked_ref->extent_op = NULL; | |
d7df2c79 | 2779 | spin_unlock(&locked_ref->lock); |
925baedd | 2780 | |
2ff7e61e | 2781 | ret = run_one_delayed_ref(trans, fs_info, ref, extent_op, |
56bec294 | 2782 | must_insert_reserved); |
eb099670 | 2783 | |
78a6184a | 2784 | btrfs_free_delayed_extent_op(extent_op); |
79787eaa | 2785 | if (ret) { |
2eadaa22 | 2786 | unselect_delayed_ref_head(delayed_refs, locked_ref); |
093486c4 | 2787 | btrfs_put_delayed_ref(ref); |
5d163e0e JM |
2788 | btrfs_debug(fs_info, "run_one_delayed_ref returned %d", |
2789 | ret); | |
79787eaa JM |
2790 | return ret; |
2791 | } | |
2792 | ||
093486c4 MX |
2793 | btrfs_put_delayed_ref(ref); |
2794 | count++; | |
c3e69d58 | 2795 | cond_resched(); |
c3e69d58 | 2796 | } |
0a2b2a84 JB |
2797 | |
2798 | /* | |
2799 | * We don't want to include ref heads since we can have empty ref heads | |
2800 | * and those will drastically skew our runtime down since we just do | |
2801 | * accounting, no actual extent tree updates. | |
2802 | */ | |
2803 | if (actual_count > 0) { | |
2804 | u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start)); | |
2805 | u64 avg; | |
2806 | ||
2807 | /* | |
2808 | * We weigh the current average higher than our current runtime | |
2809 | * to avoid large swings in the average. | |
2810 | */ | |
2811 | spin_lock(&delayed_refs->lock); | |
2812 | avg = fs_info->avg_delayed_ref_runtime * 3 + runtime; | |
f8c269d7 | 2813 | fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */ |
0a2b2a84 JB |
2814 | spin_unlock(&delayed_refs->lock); |
2815 | } | |
d7df2c79 | 2816 | return 0; |
c3e69d58 CM |
2817 | } |
2818 | ||
709c0486 AJ |
2819 | #ifdef SCRAMBLE_DELAYED_REFS |
2820 | /* | |
2821 | * Normally delayed refs get processed in ascending bytenr order. This | |
2822 | * correlates in most cases to the order added. To expose dependencies on this | |
2823 | * order, we start to process the tree in the middle instead of the beginning | |
2824 | */ | |
2825 | static u64 find_middle(struct rb_root *root) | |
2826 | { | |
2827 | struct rb_node *n = root->rb_node; | |
2828 | struct btrfs_delayed_ref_node *entry; | |
2829 | int alt = 1; | |
2830 | u64 middle; | |
2831 | u64 first = 0, last = 0; | |
2832 | ||
2833 | n = rb_first(root); | |
2834 | if (n) { | |
2835 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2836 | first = entry->bytenr; | |
2837 | } | |
2838 | n = rb_last(root); | |
2839 | if (n) { | |
2840 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2841 | last = entry->bytenr; | |
2842 | } | |
2843 | n = root->rb_node; | |
2844 | ||
2845 | while (n) { | |
2846 | entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); | |
2847 | WARN_ON(!entry->in_tree); | |
2848 | ||
2849 | middle = entry->bytenr; | |
2850 | ||
2851 | if (alt) | |
2852 | n = n->rb_left; | |
2853 | else | |
2854 | n = n->rb_right; | |
2855 | ||
2856 | alt = 1 - alt; | |
2857 | } | |
2858 | return middle; | |
2859 | } | |
2860 | #endif | |
2861 | ||
2ff7e61e | 2862 | static inline u64 heads_to_leaves(struct btrfs_fs_info *fs_info, u64 heads) |
1be41b78 JB |
2863 | { |
2864 | u64 num_bytes; | |
2865 | ||
2866 | num_bytes = heads * (sizeof(struct btrfs_extent_item) + | |
2867 | sizeof(struct btrfs_extent_inline_ref)); | |
0b246afa | 2868 | if (!btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
1be41b78 JB |
2869 | num_bytes += heads * sizeof(struct btrfs_tree_block_info); |
2870 | ||
2871 | /* | |
2872 | * We don't ever fill up leaves all the way so multiply by 2 just to be | |
01327610 | 2873 | * closer to what we're really going to want to use. |
1be41b78 | 2874 | */ |
0b246afa | 2875 | return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(fs_info)); |
1be41b78 JB |
2876 | } |
2877 | ||
1262133b JB |
2878 | /* |
2879 | * Takes the number of bytes to be csumm'ed and figures out how many leaves it | |
2880 | * would require to store the csums for that many bytes. | |
2881 | */ | |
2ff7e61e | 2882 | u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes) |
1262133b JB |
2883 | { |
2884 | u64 csum_size; | |
2885 | u64 num_csums_per_leaf; | |
2886 | u64 num_csums; | |
2887 | ||
0b246afa | 2888 | csum_size = BTRFS_MAX_ITEM_SIZE(fs_info); |
1262133b | 2889 | num_csums_per_leaf = div64_u64(csum_size, |
0b246afa JM |
2890 | (u64)btrfs_super_csum_size(fs_info->super_copy)); |
2891 | num_csums = div64_u64(csum_bytes, fs_info->sectorsize); | |
1262133b JB |
2892 | num_csums += num_csums_per_leaf - 1; |
2893 | num_csums = div64_u64(num_csums, num_csums_per_leaf); | |
2894 | return num_csums; | |
2895 | } | |
2896 | ||
0a2b2a84 | 2897 | int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, |
2ff7e61e | 2898 | struct btrfs_fs_info *fs_info) |
1be41b78 JB |
2899 | { |
2900 | struct btrfs_block_rsv *global_rsv; | |
2901 | u64 num_heads = trans->transaction->delayed_refs.num_heads_ready; | |
1262133b | 2902 | u64 csum_bytes = trans->transaction->delayed_refs.pending_csums; |
165c8b02 | 2903 | unsigned int num_dirty_bgs = trans->transaction->num_dirty_bgs; |
cb723e49 | 2904 | u64 num_bytes, num_dirty_bgs_bytes; |
1be41b78 JB |
2905 | int ret = 0; |
2906 | ||
0b246afa | 2907 | num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1); |
2ff7e61e | 2908 | num_heads = heads_to_leaves(fs_info, num_heads); |
1be41b78 | 2909 | if (num_heads > 1) |
0b246afa | 2910 | num_bytes += (num_heads - 1) * fs_info->nodesize; |
1be41b78 | 2911 | num_bytes <<= 1; |
2ff7e61e JM |
2912 | num_bytes += btrfs_csum_bytes_to_leaves(fs_info, csum_bytes) * |
2913 | fs_info->nodesize; | |
0b246afa | 2914 | num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(fs_info, |
cb723e49 | 2915 | num_dirty_bgs); |
0b246afa | 2916 | global_rsv = &fs_info->global_block_rsv; |
1be41b78 JB |
2917 | |
2918 | /* | |
2919 | * If we can't allocate any more chunks lets make sure we have _lots_ of | |
2920 | * wiggle room since running delayed refs can create more delayed refs. | |
2921 | */ | |
cb723e49 JB |
2922 | if (global_rsv->space_info->full) { |
2923 | num_dirty_bgs_bytes <<= 1; | |
1be41b78 | 2924 | num_bytes <<= 1; |
cb723e49 | 2925 | } |
1be41b78 JB |
2926 | |
2927 | spin_lock(&global_rsv->lock); | |
cb723e49 | 2928 | if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes) |
1be41b78 JB |
2929 | ret = 1; |
2930 | spin_unlock(&global_rsv->lock); | |
2931 | return ret; | |
2932 | } | |
2933 | ||
0a2b2a84 | 2934 | int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, |
2ff7e61e | 2935 | struct btrfs_fs_info *fs_info) |
0a2b2a84 | 2936 | { |
0a2b2a84 JB |
2937 | u64 num_entries = |
2938 | atomic_read(&trans->transaction->delayed_refs.num_entries); | |
2939 | u64 avg_runtime; | |
a79b7d4b | 2940 | u64 val; |
0a2b2a84 JB |
2941 | |
2942 | smp_mb(); | |
2943 | avg_runtime = fs_info->avg_delayed_ref_runtime; | |
a79b7d4b | 2944 | val = num_entries * avg_runtime; |
dc1a90c6 | 2945 | if (val >= NSEC_PER_SEC) |
0a2b2a84 | 2946 | return 1; |
a79b7d4b CM |
2947 | if (val >= NSEC_PER_SEC / 2) |
2948 | return 2; | |
0a2b2a84 | 2949 | |
2ff7e61e | 2950 | return btrfs_check_space_for_delayed_refs(trans, fs_info); |
0a2b2a84 JB |
2951 | } |
2952 | ||
a79b7d4b CM |
2953 | struct async_delayed_refs { |
2954 | struct btrfs_root *root; | |
31b9655f | 2955 | u64 transid; |
a79b7d4b CM |
2956 | int count; |
2957 | int error; | |
2958 | int sync; | |
2959 | struct completion wait; | |
2960 | struct btrfs_work work; | |
2961 | }; | |
2962 | ||
2ff7e61e JM |
2963 | static inline struct async_delayed_refs * |
2964 | to_async_delayed_refs(struct btrfs_work *work) | |
2965 | { | |
2966 | return container_of(work, struct async_delayed_refs, work); | |
2967 | } | |
2968 | ||
a79b7d4b CM |
2969 | static void delayed_ref_async_start(struct btrfs_work *work) |
2970 | { | |
2ff7e61e | 2971 | struct async_delayed_refs *async = to_async_delayed_refs(work); |
a79b7d4b | 2972 | struct btrfs_trans_handle *trans; |
2ff7e61e | 2973 | struct btrfs_fs_info *fs_info = async->root->fs_info; |
a79b7d4b CM |
2974 | int ret; |
2975 | ||
0f873eca | 2976 | /* if the commit is already started, we don't need to wait here */ |
2ff7e61e | 2977 | if (btrfs_transaction_blocked(fs_info)) |
31b9655f | 2978 | goto done; |
31b9655f | 2979 | |
0f873eca CM |
2980 | trans = btrfs_join_transaction(async->root); |
2981 | if (IS_ERR(trans)) { | |
2982 | async->error = PTR_ERR(trans); | |
a79b7d4b CM |
2983 | goto done; |
2984 | } | |
2985 | ||
2986 | /* | |
01327610 | 2987 | * trans->sync means that when we call end_transaction, we won't |
a79b7d4b CM |
2988 | * wait on delayed refs |
2989 | */ | |
2990 | trans->sync = true; | |
0f873eca CM |
2991 | |
2992 | /* Don't bother flushing if we got into a different transaction */ | |
2993 | if (trans->transid > async->transid) | |
2994 | goto end; | |
2995 | ||
c79a70b1 | 2996 | ret = btrfs_run_delayed_refs(trans, async->count); |
a79b7d4b CM |
2997 | if (ret) |
2998 | async->error = ret; | |
0f873eca | 2999 | end: |
3a45bb20 | 3000 | ret = btrfs_end_transaction(trans); |
a79b7d4b CM |
3001 | if (ret && !async->error) |
3002 | async->error = ret; | |
3003 | done: | |
3004 | if (async->sync) | |
3005 | complete(&async->wait); | |
3006 | else | |
3007 | kfree(async); | |
3008 | } | |
3009 | ||
2ff7e61e | 3010 | int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info, |
31b9655f | 3011 | unsigned long count, u64 transid, int wait) |
a79b7d4b CM |
3012 | { |
3013 | struct async_delayed_refs *async; | |
3014 | int ret; | |
3015 | ||
3016 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
3017 | if (!async) | |
3018 | return -ENOMEM; | |
3019 | ||
0b246afa | 3020 | async->root = fs_info->tree_root; |
a79b7d4b CM |
3021 | async->count = count; |
3022 | async->error = 0; | |
31b9655f | 3023 | async->transid = transid; |
a79b7d4b CM |
3024 | if (wait) |
3025 | async->sync = 1; | |
3026 | else | |
3027 | async->sync = 0; | |
3028 | init_completion(&async->wait); | |
3029 | ||
9e0af237 LB |
3030 | btrfs_init_work(&async->work, btrfs_extent_refs_helper, |
3031 | delayed_ref_async_start, NULL, NULL); | |
a79b7d4b | 3032 | |
0b246afa | 3033 | btrfs_queue_work(fs_info->extent_workers, &async->work); |
a79b7d4b CM |
3034 | |
3035 | if (wait) { | |
3036 | wait_for_completion(&async->wait); | |
3037 | ret = async->error; | |
3038 | kfree(async); | |
3039 | return ret; | |
3040 | } | |
3041 | return 0; | |
3042 | } | |
3043 | ||
c3e69d58 CM |
3044 | /* |
3045 | * this starts processing the delayed reference count updates and | |
3046 | * extent insertions we have queued up so far. count can be | |
3047 | * 0, which means to process everything in the tree at the start | |
3048 | * of the run (but not newly added entries), or it can be some target | |
3049 | * number you'd like to process. | |
79787eaa JM |
3050 | * |
3051 | * Returns 0 on success or if called with an aborted transaction | |
3052 | * Returns <0 on error and aborts the transaction | |
c3e69d58 CM |
3053 | */ |
3054 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, | |
c79a70b1 | 3055 | unsigned long count) |
c3e69d58 | 3056 | { |
c79a70b1 | 3057 | struct btrfs_fs_info *fs_info = trans->fs_info; |
c3e69d58 CM |
3058 | struct rb_node *node; |
3059 | struct btrfs_delayed_ref_root *delayed_refs; | |
c46effa6 | 3060 | struct btrfs_delayed_ref_head *head; |
c3e69d58 CM |
3061 | int ret; |
3062 | int run_all = count == (unsigned long)-1; | |
d9a0540a | 3063 | bool can_flush_pending_bgs = trans->can_flush_pending_bgs; |
c3e69d58 | 3064 | |
79787eaa JM |
3065 | /* We'll clean this up in btrfs_cleanup_transaction */ |
3066 | if (trans->aborted) | |
3067 | return 0; | |
3068 | ||
0b246afa | 3069 | if (test_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags)) |
511711af CM |
3070 | return 0; |
3071 | ||
c3e69d58 | 3072 | delayed_refs = &trans->transaction->delayed_refs; |
26455d33 | 3073 | if (count == 0) |
d7df2c79 | 3074 | count = atomic_read(&delayed_refs->num_entries) * 2; |
bb721703 | 3075 | |
c3e69d58 | 3076 | again: |
709c0486 AJ |
3077 | #ifdef SCRAMBLE_DELAYED_REFS |
3078 | delayed_refs->run_delayed_start = find_middle(&delayed_refs->root); | |
3079 | #endif | |
d9a0540a | 3080 | trans->can_flush_pending_bgs = false; |
0a1e458a | 3081 | ret = __btrfs_run_delayed_refs(trans, count); |
d7df2c79 | 3082 | if (ret < 0) { |
66642832 | 3083 | btrfs_abort_transaction(trans, ret); |
d7df2c79 | 3084 | return ret; |
eb099670 | 3085 | } |
c3e69d58 | 3086 | |
56bec294 | 3087 | if (run_all) { |
d7df2c79 | 3088 | if (!list_empty(&trans->new_bgs)) |
6c686b35 | 3089 | btrfs_create_pending_block_groups(trans); |
ea658bad | 3090 | |
d7df2c79 | 3091 | spin_lock(&delayed_refs->lock); |
c46effa6 | 3092 | node = rb_first(&delayed_refs->href_root); |
d7df2c79 JB |
3093 | if (!node) { |
3094 | spin_unlock(&delayed_refs->lock); | |
56bec294 | 3095 | goto out; |
d7df2c79 | 3096 | } |
d278850e JB |
3097 | head = rb_entry(node, struct btrfs_delayed_ref_head, |
3098 | href_node); | |
3099 | refcount_inc(&head->refs); | |
3100 | spin_unlock(&delayed_refs->lock); | |
e9d0b13b | 3101 | |
d278850e JB |
3102 | /* Mutex was contended, block until it's released and retry. */ |
3103 | mutex_lock(&head->mutex); | |
3104 | mutex_unlock(&head->mutex); | |
56bec294 | 3105 | |
d278850e | 3106 | btrfs_put_delayed_ref_head(head); |
d7df2c79 | 3107 | cond_resched(); |
56bec294 | 3108 | goto again; |
5f39d397 | 3109 | } |
54aa1f4d | 3110 | out: |
d9a0540a | 3111 | trans->can_flush_pending_bgs = can_flush_pending_bgs; |
a28ec197 CM |
3112 | return 0; |
3113 | } | |
3114 | ||
5d4f98a2 | 3115 | int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
2ff7e61e | 3116 | struct btrfs_fs_info *fs_info, |
5d4f98a2 | 3117 | u64 bytenr, u64 num_bytes, u64 flags, |
b1c79e09 | 3118 | int level, int is_data) |
5d4f98a2 YZ |
3119 | { |
3120 | struct btrfs_delayed_extent_op *extent_op; | |
3121 | int ret; | |
3122 | ||
78a6184a | 3123 | extent_op = btrfs_alloc_delayed_extent_op(); |
5d4f98a2 YZ |
3124 | if (!extent_op) |
3125 | return -ENOMEM; | |
3126 | ||
3127 | extent_op->flags_to_set = flags; | |
35b3ad50 DS |
3128 | extent_op->update_flags = true; |
3129 | extent_op->update_key = false; | |
3130 | extent_op->is_data = is_data ? true : false; | |
b1c79e09 | 3131 | extent_op->level = level; |
5d4f98a2 | 3132 | |
0b246afa | 3133 | ret = btrfs_add_delayed_extent_op(fs_info, trans, bytenr, |
66d7e7f0 | 3134 | num_bytes, extent_op); |
5d4f98a2 | 3135 | if (ret) |
78a6184a | 3136 | btrfs_free_delayed_extent_op(extent_op); |
5d4f98a2 YZ |
3137 | return ret; |
3138 | } | |
3139 | ||
e4c3b2dc | 3140 | static noinline int check_delayed_ref(struct btrfs_root *root, |
5d4f98a2 YZ |
3141 | struct btrfs_path *path, |
3142 | u64 objectid, u64 offset, u64 bytenr) | |
3143 | { | |
3144 | struct btrfs_delayed_ref_head *head; | |
3145 | struct btrfs_delayed_ref_node *ref; | |
3146 | struct btrfs_delayed_data_ref *data_ref; | |
3147 | struct btrfs_delayed_ref_root *delayed_refs; | |
e4c3b2dc | 3148 | struct btrfs_transaction *cur_trans; |
0e0adbcf | 3149 | struct rb_node *node; |
5d4f98a2 YZ |
3150 | int ret = 0; |
3151 | ||
998ac6d2 | 3152 | spin_lock(&root->fs_info->trans_lock); |
e4c3b2dc | 3153 | cur_trans = root->fs_info->running_transaction; |
998ac6d2 | 3154 | if (cur_trans) |
3155 | refcount_inc(&cur_trans->use_count); | |
3156 | spin_unlock(&root->fs_info->trans_lock); | |
e4c3b2dc LB |
3157 | if (!cur_trans) |
3158 | return 0; | |
3159 | ||
3160 | delayed_refs = &cur_trans->delayed_refs; | |
5d4f98a2 | 3161 | spin_lock(&delayed_refs->lock); |
f72ad18e | 3162 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
d7df2c79 JB |
3163 | if (!head) { |
3164 | spin_unlock(&delayed_refs->lock); | |
998ac6d2 | 3165 | btrfs_put_transaction(cur_trans); |
d7df2c79 JB |
3166 | return 0; |
3167 | } | |
5d4f98a2 YZ |
3168 | |
3169 | if (!mutex_trylock(&head->mutex)) { | |
d278850e | 3170 | refcount_inc(&head->refs); |
5d4f98a2 YZ |
3171 | spin_unlock(&delayed_refs->lock); |
3172 | ||
b3b4aa74 | 3173 | btrfs_release_path(path); |
5d4f98a2 | 3174 | |
8cc33e5c DS |
3175 | /* |
3176 | * Mutex was contended, block until it's released and let | |
3177 | * caller try again | |
3178 | */ | |
5d4f98a2 YZ |
3179 | mutex_lock(&head->mutex); |
3180 | mutex_unlock(&head->mutex); | |
d278850e | 3181 | btrfs_put_delayed_ref_head(head); |
998ac6d2 | 3182 | btrfs_put_transaction(cur_trans); |
5d4f98a2 YZ |
3183 | return -EAGAIN; |
3184 | } | |
d7df2c79 | 3185 | spin_unlock(&delayed_refs->lock); |
5d4f98a2 | 3186 | |
d7df2c79 | 3187 | spin_lock(&head->lock); |
0e0adbcf JB |
3188 | /* |
3189 | * XXX: We should replace this with a proper search function in the | |
3190 | * future. | |
3191 | */ | |
3192 | for (node = rb_first(&head->ref_tree); node; node = rb_next(node)) { | |
3193 | ref = rb_entry(node, struct btrfs_delayed_ref_node, ref_node); | |
d7df2c79 JB |
3194 | /* If it's a shared ref we know a cross reference exists */ |
3195 | if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { | |
3196 | ret = 1; | |
3197 | break; | |
3198 | } | |
5d4f98a2 | 3199 | |
d7df2c79 | 3200 | data_ref = btrfs_delayed_node_to_data_ref(ref); |
5d4f98a2 | 3201 | |
d7df2c79 JB |
3202 | /* |
3203 | * If our ref doesn't match the one we're currently looking at | |
3204 | * then we have a cross reference. | |
3205 | */ | |
3206 | if (data_ref->root != root->root_key.objectid || | |
3207 | data_ref->objectid != objectid || | |
3208 | data_ref->offset != offset) { | |
3209 | ret = 1; | |
3210 | break; | |
3211 | } | |
5d4f98a2 | 3212 | } |
d7df2c79 | 3213 | spin_unlock(&head->lock); |
5d4f98a2 | 3214 | mutex_unlock(&head->mutex); |
998ac6d2 | 3215 | btrfs_put_transaction(cur_trans); |
5d4f98a2 YZ |
3216 | return ret; |
3217 | } | |
3218 | ||
e4c3b2dc | 3219 | static noinline int check_committed_ref(struct btrfs_root *root, |
5d4f98a2 YZ |
3220 | struct btrfs_path *path, |
3221 | u64 objectid, u64 offset, u64 bytenr) | |
be20aa9d | 3222 | { |
0b246afa JM |
3223 | struct btrfs_fs_info *fs_info = root->fs_info; |
3224 | struct btrfs_root *extent_root = fs_info->extent_root; | |
f321e491 | 3225 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
3226 | struct btrfs_extent_data_ref *ref; |
3227 | struct btrfs_extent_inline_ref *iref; | |
3228 | struct btrfs_extent_item *ei; | |
f321e491 | 3229 | struct btrfs_key key; |
5d4f98a2 | 3230 | u32 item_size; |
3de28d57 | 3231 | int type; |
be20aa9d | 3232 | int ret; |
925baedd | 3233 | |
be20aa9d | 3234 | key.objectid = bytenr; |
31840ae1 | 3235 | key.offset = (u64)-1; |
f321e491 | 3236 | key.type = BTRFS_EXTENT_ITEM_KEY; |
be20aa9d | 3237 | |
be20aa9d CM |
3238 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
3239 | if (ret < 0) | |
3240 | goto out; | |
79787eaa | 3241 | BUG_ON(ret == 0); /* Corruption */ |
80ff3856 YZ |
3242 | |
3243 | ret = -ENOENT; | |
3244 | if (path->slots[0] == 0) | |
31840ae1 | 3245 | goto out; |
be20aa9d | 3246 | |
31840ae1 | 3247 | path->slots[0]--; |
f321e491 | 3248 | leaf = path->nodes[0]; |
5d4f98a2 | 3249 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
be20aa9d | 3250 | |
5d4f98a2 | 3251 | if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY) |
be20aa9d | 3252 | goto out; |
f321e491 | 3253 | |
5d4f98a2 YZ |
3254 | ret = 1; |
3255 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
3256 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
3257 | if (item_size < sizeof(*ei)) { | |
3258 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); | |
3259 | goto out; | |
3260 | } | |
3261 | #endif | |
3262 | ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); | |
bd09835d | 3263 | |
5d4f98a2 YZ |
3264 | if (item_size != sizeof(*ei) + |
3265 | btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)) | |
3266 | goto out; | |
be20aa9d | 3267 | |
5d4f98a2 YZ |
3268 | if (btrfs_extent_generation(leaf, ei) <= |
3269 | btrfs_root_last_snapshot(&root->root_item)) | |
3270 | goto out; | |
3271 | ||
3272 | iref = (struct btrfs_extent_inline_ref *)(ei + 1); | |
3de28d57 LB |
3273 | |
3274 | type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA); | |
3275 | if (type != BTRFS_EXTENT_DATA_REF_KEY) | |
5d4f98a2 YZ |
3276 | goto out; |
3277 | ||
3278 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
3279 | if (btrfs_extent_refs(leaf, ei) != | |
3280 | btrfs_extent_data_ref_count(leaf, ref) || | |
3281 | btrfs_extent_data_ref_root(leaf, ref) != | |
3282 | root->root_key.objectid || | |
3283 | btrfs_extent_data_ref_objectid(leaf, ref) != objectid || | |
3284 | btrfs_extent_data_ref_offset(leaf, ref) != offset) | |
3285 | goto out; | |
3286 | ||
3287 | ret = 0; | |
3288 | out: | |
3289 | return ret; | |
3290 | } | |
3291 | ||
e4c3b2dc LB |
3292 | int btrfs_cross_ref_exist(struct btrfs_root *root, u64 objectid, u64 offset, |
3293 | u64 bytenr) | |
5d4f98a2 YZ |
3294 | { |
3295 | struct btrfs_path *path; | |
3296 | int ret; | |
3297 | int ret2; | |
3298 | ||
3299 | path = btrfs_alloc_path(); | |
3300 | if (!path) | |
9132c4ff | 3301 | return -ENOMEM; |
5d4f98a2 YZ |
3302 | |
3303 | do { | |
e4c3b2dc | 3304 | ret = check_committed_ref(root, path, objectid, |
5d4f98a2 YZ |
3305 | offset, bytenr); |
3306 | if (ret && ret != -ENOENT) | |
f321e491 | 3307 | goto out; |
80ff3856 | 3308 | |
e4c3b2dc | 3309 | ret2 = check_delayed_ref(root, path, objectid, |
5d4f98a2 YZ |
3310 | offset, bytenr); |
3311 | } while (ret2 == -EAGAIN); | |
3312 | ||
3313 | if (ret2 && ret2 != -ENOENT) { | |
3314 | ret = ret2; | |
3315 | goto out; | |
f321e491 | 3316 | } |
5d4f98a2 YZ |
3317 | |
3318 | if (ret != -ENOENT || ret2 != -ENOENT) | |
3319 | ret = 0; | |
be20aa9d | 3320 | out: |
80ff3856 | 3321 | btrfs_free_path(path); |
f0486c68 YZ |
3322 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
3323 | WARN_ON(ret > 0); | |
f321e491 | 3324 | return ret; |
be20aa9d | 3325 | } |
c5739bba | 3326 | |
5d4f98a2 | 3327 | static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, |
b7a9f29f | 3328 | struct btrfs_root *root, |
5d4f98a2 | 3329 | struct extent_buffer *buf, |
e339a6b0 | 3330 | int full_backref, int inc) |
31840ae1 | 3331 | { |
0b246afa | 3332 | struct btrfs_fs_info *fs_info = root->fs_info; |
31840ae1 | 3333 | u64 bytenr; |
5d4f98a2 YZ |
3334 | u64 num_bytes; |
3335 | u64 parent; | |
31840ae1 | 3336 | u64 ref_root; |
31840ae1 | 3337 | u32 nritems; |
31840ae1 ZY |
3338 | struct btrfs_key key; |
3339 | struct btrfs_file_extent_item *fi; | |
3340 | int i; | |
3341 | int level; | |
3342 | int ret = 0; | |
2ff7e61e | 3343 | int (*process_func)(struct btrfs_trans_handle *, |
84f7d8e6 | 3344 | struct btrfs_root *, |
b06c4bf5 | 3345 | u64, u64, u64, u64, u64, u64); |
31840ae1 | 3346 | |
fccb84c9 | 3347 | |
0b246afa | 3348 | if (btrfs_is_testing(fs_info)) |
faa2dbf0 | 3349 | return 0; |
fccb84c9 | 3350 | |
31840ae1 | 3351 | ref_root = btrfs_header_owner(buf); |
31840ae1 ZY |
3352 | nritems = btrfs_header_nritems(buf); |
3353 | level = btrfs_header_level(buf); | |
3354 | ||
27cdeb70 | 3355 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0) |
5d4f98a2 | 3356 | return 0; |
31840ae1 | 3357 | |
5d4f98a2 YZ |
3358 | if (inc) |
3359 | process_func = btrfs_inc_extent_ref; | |
3360 | else | |
3361 | process_func = btrfs_free_extent; | |
31840ae1 | 3362 | |
5d4f98a2 YZ |
3363 | if (full_backref) |
3364 | parent = buf->start; | |
3365 | else | |
3366 | parent = 0; | |
3367 | ||
3368 | for (i = 0; i < nritems; i++) { | |
31840ae1 | 3369 | if (level == 0) { |
5d4f98a2 | 3370 | btrfs_item_key_to_cpu(buf, &key, i); |
962a298f | 3371 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
31840ae1 | 3372 | continue; |
5d4f98a2 | 3373 | fi = btrfs_item_ptr(buf, i, |
31840ae1 ZY |
3374 | struct btrfs_file_extent_item); |
3375 | if (btrfs_file_extent_type(buf, fi) == | |
3376 | BTRFS_FILE_EXTENT_INLINE) | |
3377 | continue; | |
3378 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
3379 | if (bytenr == 0) | |
3380 | continue; | |
5d4f98a2 YZ |
3381 | |
3382 | num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi); | |
3383 | key.offset -= btrfs_file_extent_offset(buf, fi); | |
84f7d8e6 | 3384 | ret = process_func(trans, root, bytenr, num_bytes, |
5d4f98a2 | 3385 | parent, ref_root, key.objectid, |
b06c4bf5 | 3386 | key.offset); |
31840ae1 ZY |
3387 | if (ret) |
3388 | goto fail; | |
3389 | } else { | |
5d4f98a2 | 3390 | bytenr = btrfs_node_blockptr(buf, i); |
0b246afa | 3391 | num_bytes = fs_info->nodesize; |
84f7d8e6 | 3392 | ret = process_func(trans, root, bytenr, num_bytes, |
b06c4bf5 | 3393 | parent, ref_root, level - 1, 0); |
31840ae1 ZY |
3394 | if (ret) |
3395 | goto fail; | |
3396 | } | |
3397 | } | |
3398 | return 0; | |
3399 | fail: | |
5d4f98a2 YZ |
3400 | return ret; |
3401 | } | |
3402 | ||
3403 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3404 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3405 | { |
e339a6b0 | 3406 | return __btrfs_mod_ref(trans, root, buf, full_backref, 1); |
5d4f98a2 YZ |
3407 | } |
3408 | ||
3409 | int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
e339a6b0 | 3410 | struct extent_buffer *buf, int full_backref) |
5d4f98a2 | 3411 | { |
e339a6b0 | 3412 | return __btrfs_mod_ref(trans, root, buf, full_backref, 0); |
31840ae1 ZY |
3413 | } |
3414 | ||
9078a3e1 | 3415 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
2ff7e61e | 3416 | struct btrfs_fs_info *fs_info, |
9078a3e1 CM |
3417 | struct btrfs_path *path, |
3418 | struct btrfs_block_group_cache *cache) | |
3419 | { | |
3420 | int ret; | |
0b246afa | 3421 | struct btrfs_root *extent_root = fs_info->extent_root; |
5f39d397 CM |
3422 | unsigned long bi; |
3423 | struct extent_buffer *leaf; | |
9078a3e1 | 3424 | |
9078a3e1 | 3425 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
df95e7f0 JB |
3426 | if (ret) { |
3427 | if (ret > 0) | |
3428 | ret = -ENOENT; | |
54aa1f4d | 3429 | goto fail; |
df95e7f0 | 3430 | } |
5f39d397 CM |
3431 | |
3432 | leaf = path->nodes[0]; | |
3433 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3434 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
3435 | btrfs_mark_buffer_dirty(leaf); | |
54aa1f4d | 3436 | fail: |
24b89d08 | 3437 | btrfs_release_path(path); |
df95e7f0 | 3438 | return ret; |
9078a3e1 CM |
3439 | |
3440 | } | |
3441 | ||
4a8c9a62 | 3442 | static struct btrfs_block_group_cache * |
2ff7e61e | 3443 | next_block_group(struct btrfs_fs_info *fs_info, |
4a8c9a62 YZ |
3444 | struct btrfs_block_group_cache *cache) |
3445 | { | |
3446 | struct rb_node *node; | |
292cbd51 | 3447 | |
0b246afa | 3448 | spin_lock(&fs_info->block_group_cache_lock); |
292cbd51 FM |
3449 | |
3450 | /* If our block group was removed, we need a full search. */ | |
3451 | if (RB_EMPTY_NODE(&cache->cache_node)) { | |
3452 | const u64 next_bytenr = cache->key.objectid + cache->key.offset; | |
3453 | ||
0b246afa | 3454 | spin_unlock(&fs_info->block_group_cache_lock); |
292cbd51 | 3455 | btrfs_put_block_group(cache); |
0b246afa | 3456 | cache = btrfs_lookup_first_block_group(fs_info, next_bytenr); return cache; |
292cbd51 | 3457 | } |
4a8c9a62 YZ |
3458 | node = rb_next(&cache->cache_node); |
3459 | btrfs_put_block_group(cache); | |
3460 | if (node) { | |
3461 | cache = rb_entry(node, struct btrfs_block_group_cache, | |
3462 | cache_node); | |
11dfe35a | 3463 | btrfs_get_block_group(cache); |
4a8c9a62 YZ |
3464 | } else |
3465 | cache = NULL; | |
0b246afa | 3466 | spin_unlock(&fs_info->block_group_cache_lock); |
4a8c9a62 YZ |
3467 | return cache; |
3468 | } | |
3469 | ||
0af3d00b JB |
3470 | static int cache_save_setup(struct btrfs_block_group_cache *block_group, |
3471 | struct btrfs_trans_handle *trans, | |
3472 | struct btrfs_path *path) | |
3473 | { | |
0b246afa JM |
3474 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
3475 | struct btrfs_root *root = fs_info->tree_root; | |
0af3d00b | 3476 | struct inode *inode = NULL; |
364ecf36 | 3477 | struct extent_changeset *data_reserved = NULL; |
0af3d00b | 3478 | u64 alloc_hint = 0; |
2b20982e | 3479 | int dcs = BTRFS_DC_ERROR; |
f8c269d7 | 3480 | u64 num_pages = 0; |
0af3d00b JB |
3481 | int retries = 0; |
3482 | int ret = 0; | |
3483 | ||
3484 | /* | |
3485 | * If this block group is smaller than 100 megs don't bother caching the | |
3486 | * block group. | |
3487 | */ | |
ee22184b | 3488 | if (block_group->key.offset < (100 * SZ_1M)) { |
0af3d00b JB |
3489 | spin_lock(&block_group->lock); |
3490 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
3491 | spin_unlock(&block_group->lock); | |
3492 | return 0; | |
3493 | } | |
3494 | ||
0c0ef4bc JB |
3495 | if (trans->aborted) |
3496 | return 0; | |
0af3d00b | 3497 | again: |
77ab86bf | 3498 | inode = lookup_free_space_inode(fs_info, block_group, path); |
0af3d00b JB |
3499 | if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { |
3500 | ret = PTR_ERR(inode); | |
b3b4aa74 | 3501 | btrfs_release_path(path); |
0af3d00b JB |
3502 | goto out; |
3503 | } | |
3504 | ||
3505 | if (IS_ERR(inode)) { | |
3506 | BUG_ON(retries); | |
3507 | retries++; | |
3508 | ||
3509 | if (block_group->ro) | |
3510 | goto out_free; | |
3511 | ||
77ab86bf JM |
3512 | ret = create_free_space_inode(fs_info, trans, block_group, |
3513 | path); | |
0af3d00b JB |
3514 | if (ret) |
3515 | goto out_free; | |
3516 | goto again; | |
3517 | } | |
3518 | ||
3519 | /* | |
3520 | * We want to set the generation to 0, that way if anything goes wrong | |
3521 | * from here on out we know not to trust this cache when we load up next | |
3522 | * time. | |
3523 | */ | |
3524 | BTRFS_I(inode)->generation = 0; | |
3525 | ret = btrfs_update_inode(trans, root, inode); | |
0c0ef4bc JB |
3526 | if (ret) { |
3527 | /* | |
3528 | * So theoretically we could recover from this, simply set the | |
3529 | * super cache generation to 0 so we know to invalidate the | |
3530 | * cache, but then we'd have to keep track of the block groups | |
3531 | * that fail this way so we know we _have_ to reset this cache | |
3532 | * before the next commit or risk reading stale cache. So to | |
3533 | * limit our exposure to horrible edge cases lets just abort the | |
3534 | * transaction, this only happens in really bad situations | |
3535 | * anyway. | |
3536 | */ | |
66642832 | 3537 | btrfs_abort_transaction(trans, ret); |
0c0ef4bc JB |
3538 | goto out_put; |
3539 | } | |
0af3d00b JB |
3540 | WARN_ON(ret); |
3541 | ||
8e138e0d JB |
3542 | /* We've already setup this transaction, go ahead and exit */ |
3543 | if (block_group->cache_generation == trans->transid && | |
3544 | i_size_read(inode)) { | |
3545 | dcs = BTRFS_DC_SETUP; | |
3546 | goto out_put; | |
3547 | } | |
3548 | ||
0af3d00b | 3549 | if (i_size_read(inode) > 0) { |
2ff7e61e | 3550 | ret = btrfs_check_trunc_cache_free_space(fs_info, |
0b246afa | 3551 | &fs_info->global_block_rsv); |
7b61cd92 MX |
3552 | if (ret) |
3553 | goto out_put; | |
3554 | ||
77ab86bf | 3555 | ret = btrfs_truncate_free_space_cache(trans, NULL, inode); |
0af3d00b JB |
3556 | if (ret) |
3557 | goto out_put; | |
3558 | } | |
3559 | ||
3560 | spin_lock(&block_group->lock); | |
cf7c1ef6 | 3561 | if (block_group->cached != BTRFS_CACHE_FINISHED || |
0b246afa | 3562 | !btrfs_test_opt(fs_info, SPACE_CACHE)) { |
cf7c1ef6 LB |
3563 | /* |
3564 | * don't bother trying to write stuff out _if_ | |
3565 | * a) we're not cached, | |
1a79c1f2 LB |
3566 | * b) we're with nospace_cache mount option, |
3567 | * c) we're with v2 space_cache (FREE_SPACE_TREE). | |
cf7c1ef6 | 3568 | */ |
2b20982e | 3569 | dcs = BTRFS_DC_WRITTEN; |
0af3d00b JB |
3570 | spin_unlock(&block_group->lock); |
3571 | goto out_put; | |
3572 | } | |
3573 | spin_unlock(&block_group->lock); | |
3574 | ||
2968b1f4 JB |
3575 | /* |
3576 | * We hit an ENOSPC when setting up the cache in this transaction, just | |
3577 | * skip doing the setup, we've already cleared the cache so we're safe. | |
3578 | */ | |
3579 | if (test_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags)) { | |
3580 | ret = -ENOSPC; | |
3581 | goto out_put; | |
3582 | } | |
3583 | ||
6fc823b1 JB |
3584 | /* |
3585 | * Try to preallocate enough space based on how big the block group is. | |
3586 | * Keep in mind this has to include any pinned space which could end up | |
3587 | * taking up quite a bit since it's not folded into the other space | |
3588 | * cache. | |
3589 | */ | |
ee22184b | 3590 | num_pages = div_u64(block_group->key.offset, SZ_256M); |
0af3d00b JB |
3591 | if (!num_pages) |
3592 | num_pages = 1; | |
3593 | ||
0af3d00b | 3594 | num_pages *= 16; |
09cbfeaf | 3595 | num_pages *= PAGE_SIZE; |
0af3d00b | 3596 | |
364ecf36 | 3597 | ret = btrfs_check_data_free_space(inode, &data_reserved, 0, num_pages); |
0af3d00b JB |
3598 | if (ret) |
3599 | goto out_put; | |
3600 | ||
3601 | ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages, | |
3602 | num_pages, num_pages, | |
3603 | &alloc_hint); | |
2968b1f4 JB |
3604 | /* |
3605 | * Our cache requires contiguous chunks so that we don't modify a bunch | |
3606 | * of metadata or split extents when writing the cache out, which means | |
3607 | * we can enospc if we are heavily fragmented in addition to just normal | |
3608 | * out of space conditions. So if we hit this just skip setting up any | |
3609 | * other block groups for this transaction, maybe we'll unpin enough | |
3610 | * space the next time around. | |
3611 | */ | |
2b20982e JB |
3612 | if (!ret) |
3613 | dcs = BTRFS_DC_SETUP; | |
2968b1f4 JB |
3614 | else if (ret == -ENOSPC) |
3615 | set_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags); | |
c09544e0 | 3616 | |
0af3d00b JB |
3617 | out_put: |
3618 | iput(inode); | |
3619 | out_free: | |
b3b4aa74 | 3620 | btrfs_release_path(path); |
0af3d00b JB |
3621 | out: |
3622 | spin_lock(&block_group->lock); | |
e65cbb94 | 3623 | if (!ret && dcs == BTRFS_DC_SETUP) |
5b0e95bf | 3624 | block_group->cache_generation = trans->transid; |
2b20982e | 3625 | block_group->disk_cache_state = dcs; |
0af3d00b JB |
3626 | spin_unlock(&block_group->lock); |
3627 | ||
364ecf36 | 3628 | extent_changeset_free(data_reserved); |
0af3d00b JB |
3629 | return ret; |
3630 | } | |
3631 | ||
dcdf7f6d | 3632 | int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, |
2ff7e61e | 3633 | struct btrfs_fs_info *fs_info) |
dcdf7f6d JB |
3634 | { |
3635 | struct btrfs_block_group_cache *cache, *tmp; | |
3636 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3637 | struct btrfs_path *path; | |
3638 | ||
3639 | if (list_empty(&cur_trans->dirty_bgs) || | |
0b246afa | 3640 | !btrfs_test_opt(fs_info, SPACE_CACHE)) |
dcdf7f6d JB |
3641 | return 0; |
3642 | ||
3643 | path = btrfs_alloc_path(); | |
3644 | if (!path) | |
3645 | return -ENOMEM; | |
3646 | ||
3647 | /* Could add new block groups, use _safe just in case */ | |
3648 | list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, | |
3649 | dirty_list) { | |
3650 | if (cache->disk_cache_state == BTRFS_DC_CLEAR) | |
3651 | cache_save_setup(cache, trans, path); | |
3652 | } | |
3653 | ||
3654 | btrfs_free_path(path); | |
3655 | return 0; | |
3656 | } | |
3657 | ||
1bbc621e CM |
3658 | /* |
3659 | * transaction commit does final block group cache writeback during a | |
3660 | * critical section where nothing is allowed to change the FS. This is | |
3661 | * required in order for the cache to actually match the block group, | |
3662 | * but can introduce a lot of latency into the commit. | |
3663 | * | |
3664 | * So, btrfs_start_dirty_block_groups is here to kick off block group | |
3665 | * cache IO. There's a chance we'll have to redo some of it if the | |
3666 | * block group changes again during the commit, but it greatly reduces | |
3667 | * the commit latency by getting rid of the easy block groups while | |
3668 | * we're still allowing others to join the commit. | |
3669 | */ | |
21217054 | 3670 | int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans) |
9078a3e1 | 3671 | { |
21217054 | 3672 | struct btrfs_fs_info *fs_info = trans->fs_info; |
4a8c9a62 | 3673 | struct btrfs_block_group_cache *cache; |
ce93ec54 JB |
3674 | struct btrfs_transaction *cur_trans = trans->transaction; |
3675 | int ret = 0; | |
c9dc4c65 | 3676 | int should_put; |
1bbc621e CM |
3677 | struct btrfs_path *path = NULL; |
3678 | LIST_HEAD(dirty); | |
3679 | struct list_head *io = &cur_trans->io_bgs; | |
c9dc4c65 | 3680 | int num_started = 0; |
1bbc621e CM |
3681 | int loops = 0; |
3682 | ||
3683 | spin_lock(&cur_trans->dirty_bgs_lock); | |
b58d1a9e FM |
3684 | if (list_empty(&cur_trans->dirty_bgs)) { |
3685 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3686 | return 0; | |
1bbc621e | 3687 | } |
b58d1a9e | 3688 | list_splice_init(&cur_trans->dirty_bgs, &dirty); |
1bbc621e | 3689 | spin_unlock(&cur_trans->dirty_bgs_lock); |
ce93ec54 | 3690 | |
1bbc621e | 3691 | again: |
1bbc621e CM |
3692 | /* |
3693 | * make sure all the block groups on our dirty list actually | |
3694 | * exist | |
3695 | */ | |
6c686b35 | 3696 | btrfs_create_pending_block_groups(trans); |
1bbc621e CM |
3697 | |
3698 | if (!path) { | |
3699 | path = btrfs_alloc_path(); | |
3700 | if (!path) | |
3701 | return -ENOMEM; | |
3702 | } | |
3703 | ||
b58d1a9e FM |
3704 | /* |
3705 | * cache_write_mutex is here only to save us from balance or automatic | |
3706 | * removal of empty block groups deleting this block group while we are | |
3707 | * writing out the cache | |
3708 | */ | |
3709 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e CM |
3710 | while (!list_empty(&dirty)) { |
3711 | cache = list_first_entry(&dirty, | |
3712 | struct btrfs_block_group_cache, | |
3713 | dirty_list); | |
1bbc621e CM |
3714 | /* |
3715 | * this can happen if something re-dirties a block | |
3716 | * group that is already under IO. Just wait for it to | |
3717 | * finish and then do it all again | |
3718 | */ | |
3719 | if (!list_empty(&cache->io_list)) { | |
3720 | list_del_init(&cache->io_list); | |
afdb5718 | 3721 | btrfs_wait_cache_io(trans, cache, path); |
1bbc621e CM |
3722 | btrfs_put_block_group(cache); |
3723 | } | |
3724 | ||
3725 | ||
3726 | /* | |
3727 | * btrfs_wait_cache_io uses the cache->dirty_list to decide | |
3728 | * if it should update the cache_state. Don't delete | |
3729 | * until after we wait. | |
3730 | * | |
3731 | * Since we're not running in the commit critical section | |
3732 | * we need the dirty_bgs_lock to protect from update_block_group | |
3733 | */ | |
3734 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3735 | list_del_init(&cache->dirty_list); | |
3736 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3737 | ||
3738 | should_put = 1; | |
3739 | ||
3740 | cache_save_setup(cache, trans, path); | |
3741 | ||
3742 | if (cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3743 | cache->io_ctl.inode = NULL; | |
0b246afa | 3744 | ret = btrfs_write_out_cache(fs_info, trans, |
5b4aacef | 3745 | cache, path); |
1bbc621e CM |
3746 | if (ret == 0 && cache->io_ctl.inode) { |
3747 | num_started++; | |
3748 | should_put = 0; | |
3749 | ||
3750 | /* | |
45ae2c18 NB |
3751 | * The cache_write_mutex is protecting the |
3752 | * io_list, also refer to the definition of | |
3753 | * btrfs_transaction::io_bgs for more details | |
1bbc621e CM |
3754 | */ |
3755 | list_add_tail(&cache->io_list, io); | |
3756 | } else { | |
3757 | /* | |
3758 | * if we failed to write the cache, the | |
3759 | * generation will be bad and life goes on | |
3760 | */ | |
3761 | ret = 0; | |
3762 | } | |
3763 | } | |
ff1f8250 | 3764 | if (!ret) { |
2ff7e61e JM |
3765 | ret = write_one_cache_group(trans, fs_info, |
3766 | path, cache); | |
ff1f8250 FM |
3767 | /* |
3768 | * Our block group might still be attached to the list | |
3769 | * of new block groups in the transaction handle of some | |
3770 | * other task (struct btrfs_trans_handle->new_bgs). This | |
3771 | * means its block group item isn't yet in the extent | |
3772 | * tree. If this happens ignore the error, as we will | |
3773 | * try again later in the critical section of the | |
3774 | * transaction commit. | |
3775 | */ | |
3776 | if (ret == -ENOENT) { | |
3777 | ret = 0; | |
3778 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3779 | if (list_empty(&cache->dirty_list)) { | |
3780 | list_add_tail(&cache->dirty_list, | |
3781 | &cur_trans->dirty_bgs); | |
3782 | btrfs_get_block_group(cache); | |
3783 | } | |
3784 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3785 | } else if (ret) { | |
66642832 | 3786 | btrfs_abort_transaction(trans, ret); |
ff1f8250 FM |
3787 | } |
3788 | } | |
1bbc621e CM |
3789 | |
3790 | /* if its not on the io list, we need to put the block group */ | |
3791 | if (should_put) | |
3792 | btrfs_put_block_group(cache); | |
3793 | ||
3794 | if (ret) | |
3795 | break; | |
b58d1a9e FM |
3796 | |
3797 | /* | |
3798 | * Avoid blocking other tasks for too long. It might even save | |
3799 | * us from writing caches for block groups that are going to be | |
3800 | * removed. | |
3801 | */ | |
3802 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
3803 | mutex_lock(&trans->transaction->cache_write_mutex); | |
1bbc621e | 3804 | } |
b58d1a9e | 3805 | mutex_unlock(&trans->transaction->cache_write_mutex); |
1bbc621e CM |
3806 | |
3807 | /* | |
3808 | * go through delayed refs for all the stuff we've just kicked off | |
3809 | * and then loop back (just once) | |
3810 | */ | |
c79a70b1 | 3811 | ret = btrfs_run_delayed_refs(trans, 0); |
1bbc621e CM |
3812 | if (!ret && loops == 0) { |
3813 | loops++; | |
3814 | spin_lock(&cur_trans->dirty_bgs_lock); | |
3815 | list_splice_init(&cur_trans->dirty_bgs, &dirty); | |
b58d1a9e FM |
3816 | /* |
3817 | * dirty_bgs_lock protects us from concurrent block group | |
3818 | * deletes too (not just cache_write_mutex). | |
3819 | */ | |
3820 | if (!list_empty(&dirty)) { | |
3821 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
3822 | goto again; | |
3823 | } | |
1bbc621e | 3824 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c79a1751 | 3825 | } else if (ret < 0) { |
2ff7e61e | 3826 | btrfs_cleanup_dirty_bgs(cur_trans, fs_info); |
1bbc621e CM |
3827 | } |
3828 | ||
3829 | btrfs_free_path(path); | |
3830 | return ret; | |
3831 | } | |
3832 | ||
3833 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, | |
2ff7e61e | 3834 | struct btrfs_fs_info *fs_info) |
1bbc621e CM |
3835 | { |
3836 | struct btrfs_block_group_cache *cache; | |
3837 | struct btrfs_transaction *cur_trans = trans->transaction; | |
3838 | int ret = 0; | |
3839 | int should_put; | |
3840 | struct btrfs_path *path; | |
3841 | struct list_head *io = &cur_trans->io_bgs; | |
3842 | int num_started = 0; | |
9078a3e1 CM |
3843 | |
3844 | path = btrfs_alloc_path(); | |
3845 | if (!path) | |
3846 | return -ENOMEM; | |
3847 | ||
ce93ec54 | 3848 | /* |
e44081ef FM |
3849 | * Even though we are in the critical section of the transaction commit, |
3850 | * we can still have concurrent tasks adding elements to this | |
3851 | * transaction's list of dirty block groups. These tasks correspond to | |
3852 | * endio free space workers started when writeback finishes for a | |
3853 | * space cache, which run inode.c:btrfs_finish_ordered_io(), and can | |
3854 | * allocate new block groups as a result of COWing nodes of the root | |
3855 | * tree when updating the free space inode. The writeback for the space | |
3856 | * caches is triggered by an earlier call to | |
3857 | * btrfs_start_dirty_block_groups() and iterations of the following | |
3858 | * loop. | |
3859 | * Also we want to do the cache_save_setup first and then run the | |
ce93ec54 JB |
3860 | * delayed refs to make sure we have the best chance at doing this all |
3861 | * in one shot. | |
3862 | */ | |
e44081ef | 3863 | spin_lock(&cur_trans->dirty_bgs_lock); |
ce93ec54 JB |
3864 | while (!list_empty(&cur_trans->dirty_bgs)) { |
3865 | cache = list_first_entry(&cur_trans->dirty_bgs, | |
3866 | struct btrfs_block_group_cache, | |
3867 | dirty_list); | |
c9dc4c65 CM |
3868 | |
3869 | /* | |
3870 | * this can happen if cache_save_setup re-dirties a block | |
3871 | * group that is already under IO. Just wait for it to | |
3872 | * finish and then do it all again | |
3873 | */ | |
3874 | if (!list_empty(&cache->io_list)) { | |
e44081ef | 3875 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3876 | list_del_init(&cache->io_list); |
afdb5718 | 3877 | btrfs_wait_cache_io(trans, cache, path); |
c9dc4c65 | 3878 | btrfs_put_block_group(cache); |
e44081ef | 3879 | spin_lock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 CM |
3880 | } |
3881 | ||
1bbc621e CM |
3882 | /* |
3883 | * don't remove from the dirty list until after we've waited | |
3884 | * on any pending IO | |
3885 | */ | |
ce93ec54 | 3886 | list_del_init(&cache->dirty_list); |
e44081ef | 3887 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 CM |
3888 | should_put = 1; |
3889 | ||
1bbc621e | 3890 | cache_save_setup(cache, trans, path); |
c9dc4c65 | 3891 | |
ce93ec54 | 3892 | if (!ret) |
c79a70b1 | 3893 | ret = btrfs_run_delayed_refs(trans, |
2ff7e61e | 3894 | (unsigned long) -1); |
c9dc4c65 CM |
3895 | |
3896 | if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { | |
3897 | cache->io_ctl.inode = NULL; | |
0b246afa | 3898 | ret = btrfs_write_out_cache(fs_info, trans, |
5b4aacef | 3899 | cache, path); |
c9dc4c65 CM |
3900 | if (ret == 0 && cache->io_ctl.inode) { |
3901 | num_started++; | |
3902 | should_put = 0; | |
1bbc621e | 3903 | list_add_tail(&cache->io_list, io); |
c9dc4c65 CM |
3904 | } else { |
3905 | /* | |
3906 | * if we failed to write the cache, the | |
3907 | * generation will be bad and life goes on | |
3908 | */ | |
3909 | ret = 0; | |
3910 | } | |
3911 | } | |
ff1f8250 | 3912 | if (!ret) { |
2ff7e61e JM |
3913 | ret = write_one_cache_group(trans, fs_info, |
3914 | path, cache); | |
2bc0bb5f FM |
3915 | /* |
3916 | * One of the free space endio workers might have | |
3917 | * created a new block group while updating a free space | |
3918 | * cache's inode (at inode.c:btrfs_finish_ordered_io()) | |
3919 | * and hasn't released its transaction handle yet, in | |
3920 | * which case the new block group is still attached to | |
3921 | * its transaction handle and its creation has not | |
3922 | * finished yet (no block group item in the extent tree | |
3923 | * yet, etc). If this is the case, wait for all free | |
3924 | * space endio workers to finish and retry. This is a | |
3925 | * a very rare case so no need for a more efficient and | |
3926 | * complex approach. | |
3927 | */ | |
3928 | if (ret == -ENOENT) { | |
3929 | wait_event(cur_trans->writer_wait, | |
3930 | atomic_read(&cur_trans->num_writers) == 1); | |
2ff7e61e JM |
3931 | ret = write_one_cache_group(trans, fs_info, |
3932 | path, cache); | |
2bc0bb5f | 3933 | } |
ff1f8250 | 3934 | if (ret) |
66642832 | 3935 | btrfs_abort_transaction(trans, ret); |
ff1f8250 | 3936 | } |
c9dc4c65 CM |
3937 | |
3938 | /* if its not on the io list, we need to put the block group */ | |
3939 | if (should_put) | |
3940 | btrfs_put_block_group(cache); | |
e44081ef | 3941 | spin_lock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3942 | } |
e44081ef | 3943 | spin_unlock(&cur_trans->dirty_bgs_lock); |
c9dc4c65 | 3944 | |
45ae2c18 NB |
3945 | /* |
3946 | * Refer to the definition of io_bgs member for details why it's safe | |
3947 | * to use it without any locking | |
3948 | */ | |
1bbc621e CM |
3949 | while (!list_empty(io)) { |
3950 | cache = list_first_entry(io, struct btrfs_block_group_cache, | |
c9dc4c65 CM |
3951 | io_list); |
3952 | list_del_init(&cache->io_list); | |
afdb5718 | 3953 | btrfs_wait_cache_io(trans, cache, path); |
0cb59c99 JB |
3954 | btrfs_put_block_group(cache); |
3955 | } | |
3956 | ||
9078a3e1 | 3957 | btrfs_free_path(path); |
ce93ec54 | 3958 | return ret; |
9078a3e1 CM |
3959 | } |
3960 | ||
2ff7e61e | 3961 | int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr) |
d2fb3437 YZ |
3962 | { |
3963 | struct btrfs_block_group_cache *block_group; | |
3964 | int readonly = 0; | |
3965 | ||
0b246afa | 3966 | block_group = btrfs_lookup_block_group(fs_info, bytenr); |
d2fb3437 YZ |
3967 | if (!block_group || block_group->ro) |
3968 | readonly = 1; | |
3969 | if (block_group) | |
fa9c0d79 | 3970 | btrfs_put_block_group(block_group); |
d2fb3437 YZ |
3971 | return readonly; |
3972 | } | |
3973 | ||
f78c436c FM |
3974 | bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr) |
3975 | { | |
3976 | struct btrfs_block_group_cache *bg; | |
3977 | bool ret = true; | |
3978 | ||
3979 | bg = btrfs_lookup_block_group(fs_info, bytenr); | |
3980 | if (!bg) | |
3981 | return false; | |
3982 | ||
3983 | spin_lock(&bg->lock); | |
3984 | if (bg->ro) | |
3985 | ret = false; | |
3986 | else | |
3987 | atomic_inc(&bg->nocow_writers); | |
3988 | spin_unlock(&bg->lock); | |
3989 | ||
3990 | /* no put on block group, done by btrfs_dec_nocow_writers */ | |
3991 | if (!ret) | |
3992 | btrfs_put_block_group(bg); | |
3993 | ||
3994 | return ret; | |
3995 | ||
3996 | } | |
3997 | ||
3998 | void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr) | |
3999 | { | |
4000 | struct btrfs_block_group_cache *bg; | |
4001 | ||
4002 | bg = btrfs_lookup_block_group(fs_info, bytenr); | |
4003 | ASSERT(bg); | |
4004 | if (atomic_dec_and_test(&bg->nocow_writers)) | |
4625956a | 4005 | wake_up_var(&bg->nocow_writers); |
f78c436c FM |
4006 | /* |
4007 | * Once for our lookup and once for the lookup done by a previous call | |
4008 | * to btrfs_inc_nocow_writers() | |
4009 | */ | |
4010 | btrfs_put_block_group(bg); | |
4011 | btrfs_put_block_group(bg); | |
4012 | } | |
4013 | ||
f78c436c FM |
4014 | void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg) |
4015 | { | |
4625956a | 4016 | wait_var_event(&bg->nocow_writers, !atomic_read(&bg->nocow_writers)); |
f78c436c FM |
4017 | } |
4018 | ||
6ab0a202 JM |
4019 | static const char *alloc_name(u64 flags) |
4020 | { | |
4021 | switch (flags) { | |
4022 | case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA: | |
4023 | return "mixed"; | |
4024 | case BTRFS_BLOCK_GROUP_METADATA: | |
4025 | return "metadata"; | |
4026 | case BTRFS_BLOCK_GROUP_DATA: | |
4027 | return "data"; | |
4028 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
4029 | return "system"; | |
4030 | default: | |
4031 | WARN_ON(1); | |
4032 | return "invalid-combination"; | |
4033 | }; | |
4034 | } | |
4035 | ||
4ca61683 | 4036 | static int create_space_info(struct btrfs_fs_info *info, u64 flags) |
2be12ef7 NB |
4037 | { |
4038 | ||
4039 | struct btrfs_space_info *space_info; | |
4040 | int i; | |
4041 | int ret; | |
4042 | ||
4043 | space_info = kzalloc(sizeof(*space_info), GFP_NOFS); | |
4044 | if (!space_info) | |
4045 | return -ENOMEM; | |
4046 | ||
4047 | ret = percpu_counter_init(&space_info->total_bytes_pinned, 0, | |
4048 | GFP_KERNEL); | |
4049 | if (ret) { | |
4050 | kfree(space_info); | |
4051 | return ret; | |
4052 | } | |
4053 | ||
4054 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) | |
4055 | INIT_LIST_HEAD(&space_info->block_groups[i]); | |
4056 | init_rwsem(&space_info->groups_sem); | |
4057 | spin_lock_init(&space_info->lock); | |
4058 | space_info->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; | |
4059 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; | |
4060 | init_waitqueue_head(&space_info->wait); | |
4061 | INIT_LIST_HEAD(&space_info->ro_bgs); | |
4062 | INIT_LIST_HEAD(&space_info->tickets); | |
4063 | INIT_LIST_HEAD(&space_info->priority_tickets); | |
4064 | ||
4065 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
4066 | info->space_info_kobj, "%s", | |
4067 | alloc_name(space_info->flags)); | |
4068 | if (ret) { | |
4069 | percpu_counter_destroy(&space_info->total_bytes_pinned); | |
4070 | kfree(space_info); | |
4071 | return ret; | |
4072 | } | |
4073 | ||
2be12ef7 NB |
4074 | list_add_rcu(&space_info->list, &info->space_info); |
4075 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
4076 | info->data_sinfo = space_info; | |
4077 | ||
4078 | return ret; | |
4079 | } | |
4080 | ||
d2006e6d | 4081 | static void update_space_info(struct btrfs_fs_info *info, u64 flags, |
593060d7 | 4082 | u64 total_bytes, u64 bytes_used, |
e40edf2d | 4083 | u64 bytes_readonly, |
593060d7 CM |
4084 | struct btrfs_space_info **space_info) |
4085 | { | |
4086 | struct btrfs_space_info *found; | |
b742bb82 YZ |
4087 | int factor; |
4088 | ||
4089 | if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
4090 | BTRFS_BLOCK_GROUP_RAID10)) | |
4091 | factor = 2; | |
4092 | else | |
4093 | factor = 1; | |
593060d7 CM |
4094 | |
4095 | found = __find_space_info(info, flags); | |
d2006e6d NB |
4096 | ASSERT(found); |
4097 | spin_lock(&found->lock); | |
4098 | found->total_bytes += total_bytes; | |
4099 | found->disk_total += total_bytes * factor; | |
4100 | found->bytes_used += bytes_used; | |
4101 | found->disk_used += bytes_used * factor; | |
4102 | found->bytes_readonly += bytes_readonly; | |
4103 | if (total_bytes > 0) | |
4104 | found->full = 0; | |
4105 | space_info_add_new_bytes(info, found, total_bytes - | |
4106 | bytes_used - bytes_readonly); | |
4107 | spin_unlock(&found->lock); | |
4108 | *space_info = found; | |
593060d7 CM |
4109 | } |
4110 | ||
8790d502 CM |
4111 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
4112 | { | |
899c81ea ID |
4113 | u64 extra_flags = chunk_to_extended(flags) & |
4114 | BTRFS_EXTENDED_PROFILE_MASK; | |
a46d11a8 | 4115 | |
de98ced9 | 4116 | write_seqlock(&fs_info->profiles_lock); |
a46d11a8 ID |
4117 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
4118 | fs_info->avail_data_alloc_bits |= extra_flags; | |
4119 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
4120 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
4121 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
4122 | fs_info->avail_system_alloc_bits |= extra_flags; | |
de98ced9 | 4123 | write_sequnlock(&fs_info->profiles_lock); |
8790d502 | 4124 | } |
593060d7 | 4125 | |
fc67c450 ID |
4126 | /* |
4127 | * returns target flags in extended format or 0 if restripe for this | |
4128 | * chunk_type is not in progress | |
c6664b42 | 4129 | * |
dccdb07b | 4130 | * should be called with balance_lock held |
fc67c450 ID |
4131 | */ |
4132 | static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) | |
4133 | { | |
4134 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4135 | u64 target = 0; | |
4136 | ||
fc67c450 ID |
4137 | if (!bctl) |
4138 | return 0; | |
4139 | ||
4140 | if (flags & BTRFS_BLOCK_GROUP_DATA && | |
4141 | bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4142 | target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; | |
4143 | } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && | |
4144 | bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4145 | target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; | |
4146 | } else if (flags & BTRFS_BLOCK_GROUP_METADATA && | |
4147 | bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { | |
4148 | target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; | |
4149 | } | |
4150 | ||
4151 | return target; | |
4152 | } | |
4153 | ||
a46d11a8 ID |
4154 | /* |
4155 | * @flags: available profiles in extended format (see ctree.h) | |
4156 | * | |
e4d8ec0f ID |
4157 | * Returns reduced profile in chunk format. If profile changing is in |
4158 | * progress (either running or paused) picks the target profile (if it's | |
4159 | * already available), otherwise falls back to plain reducing. | |
a46d11a8 | 4160 | */ |
2ff7e61e | 4161 | static u64 btrfs_reduce_alloc_profile(struct btrfs_fs_info *fs_info, u64 flags) |
ec44a35c | 4162 | { |
0b246afa | 4163 | u64 num_devices = fs_info->fs_devices->rw_devices; |
fc67c450 | 4164 | u64 target; |
9c170b26 ZL |
4165 | u64 raid_type; |
4166 | u64 allowed = 0; | |
a061fc8d | 4167 | |
fc67c450 ID |
4168 | /* |
4169 | * see if restripe for this chunk_type is in progress, if so | |
4170 | * try to reduce to the target profile | |
4171 | */ | |
0b246afa JM |
4172 | spin_lock(&fs_info->balance_lock); |
4173 | target = get_restripe_target(fs_info, flags); | |
fc67c450 ID |
4174 | if (target) { |
4175 | /* pick target profile only if it's already available */ | |
4176 | if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) { | |
0b246afa | 4177 | spin_unlock(&fs_info->balance_lock); |
fc67c450 | 4178 | return extended_to_chunk(target); |
e4d8ec0f ID |
4179 | } |
4180 | } | |
0b246afa | 4181 | spin_unlock(&fs_info->balance_lock); |
e4d8ec0f | 4182 | |
53b381b3 | 4183 | /* First, mask out the RAID levels which aren't possible */ |
9c170b26 ZL |
4184 | for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { |
4185 | if (num_devices >= btrfs_raid_array[raid_type].devs_min) | |
41a6e891 | 4186 | allowed |= btrfs_raid_array[raid_type].bg_flag; |
9c170b26 ZL |
4187 | } |
4188 | allowed &= flags; | |
4189 | ||
4190 | if (allowed & BTRFS_BLOCK_GROUP_RAID6) | |
4191 | allowed = BTRFS_BLOCK_GROUP_RAID6; | |
4192 | else if (allowed & BTRFS_BLOCK_GROUP_RAID5) | |
4193 | allowed = BTRFS_BLOCK_GROUP_RAID5; | |
4194 | else if (allowed & BTRFS_BLOCK_GROUP_RAID10) | |
4195 | allowed = BTRFS_BLOCK_GROUP_RAID10; | |
4196 | else if (allowed & BTRFS_BLOCK_GROUP_RAID1) | |
4197 | allowed = BTRFS_BLOCK_GROUP_RAID1; | |
4198 | else if (allowed & BTRFS_BLOCK_GROUP_RAID0) | |
4199 | allowed = BTRFS_BLOCK_GROUP_RAID0; | |
4200 | ||
4201 | flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK; | |
4202 | ||
4203 | return extended_to_chunk(flags | allowed); | |
ec44a35c CM |
4204 | } |
4205 | ||
2ff7e61e | 4206 | static u64 get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags) |
6a63209f | 4207 | { |
de98ced9 | 4208 | unsigned seq; |
f8213bdc | 4209 | u64 flags; |
de98ced9 MX |
4210 | |
4211 | do { | |
f8213bdc | 4212 | flags = orig_flags; |
0b246afa | 4213 | seq = read_seqbegin(&fs_info->profiles_lock); |
de98ced9 MX |
4214 | |
4215 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
0b246afa | 4216 | flags |= fs_info->avail_data_alloc_bits; |
de98ced9 | 4217 | else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
0b246afa | 4218 | flags |= fs_info->avail_system_alloc_bits; |
de98ced9 | 4219 | else if (flags & BTRFS_BLOCK_GROUP_METADATA) |
0b246afa JM |
4220 | flags |= fs_info->avail_metadata_alloc_bits; |
4221 | } while (read_seqretry(&fs_info->profiles_lock, seq)); | |
6fef8df1 | 4222 | |
2ff7e61e | 4223 | return btrfs_reduce_alloc_profile(fs_info, flags); |
6a63209f JB |
4224 | } |
4225 | ||
1b86826d | 4226 | static u64 get_alloc_profile_by_root(struct btrfs_root *root, int data) |
9ed74f2d | 4227 | { |
0b246afa | 4228 | struct btrfs_fs_info *fs_info = root->fs_info; |
b742bb82 | 4229 | u64 flags; |
53b381b3 | 4230 | u64 ret; |
9ed74f2d | 4231 | |
b742bb82 YZ |
4232 | if (data) |
4233 | flags = BTRFS_BLOCK_GROUP_DATA; | |
0b246afa | 4234 | else if (root == fs_info->chunk_root) |
b742bb82 | 4235 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
9ed74f2d | 4236 | else |
b742bb82 | 4237 | flags = BTRFS_BLOCK_GROUP_METADATA; |
9ed74f2d | 4238 | |
2ff7e61e | 4239 | ret = get_alloc_profile(fs_info, flags); |
53b381b3 | 4240 | return ret; |
6a63209f | 4241 | } |
9ed74f2d | 4242 | |
1b86826d JM |
4243 | u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info) |
4244 | { | |
4245 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA); | |
4246 | } | |
4247 | ||
4248 | u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info) | |
4249 | { | |
4250 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
4251 | } | |
4252 | ||
4253 | u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info) | |
4254 | { | |
4255 | return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); | |
4256 | } | |
4257 | ||
4136135b LB |
4258 | static u64 btrfs_space_info_used(struct btrfs_space_info *s_info, |
4259 | bool may_use_included) | |
4260 | { | |
4261 | ASSERT(s_info); | |
4262 | return s_info->bytes_used + s_info->bytes_reserved + | |
4263 | s_info->bytes_pinned + s_info->bytes_readonly + | |
4264 | (may_use_included ? s_info->bytes_may_use : 0); | |
4265 | } | |
4266 | ||
04f4f916 | 4267 | int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes) |
6a63209f | 4268 | { |
04f4f916 | 4269 | struct btrfs_root *root = inode->root; |
b4d7c3c9 | 4270 | struct btrfs_fs_info *fs_info = root->fs_info; |
1174cade | 4271 | struct btrfs_space_info *data_sinfo = fs_info->data_sinfo; |
ab6e2410 | 4272 | u64 used; |
94b947b2 | 4273 | int ret = 0; |
c99f1b0c ZL |
4274 | int need_commit = 2; |
4275 | int have_pinned_space; | |
6a63209f | 4276 | |
6a63209f | 4277 | /* make sure bytes are sectorsize aligned */ |
0b246afa | 4278 | bytes = ALIGN(bytes, fs_info->sectorsize); |
6a63209f | 4279 | |
9dced186 | 4280 | if (btrfs_is_free_space_inode(inode)) { |
c99f1b0c | 4281 | need_commit = 0; |
9dced186 | 4282 | ASSERT(current->journal_info); |
0af3d00b JB |
4283 | } |
4284 | ||
6a63209f JB |
4285 | again: |
4286 | /* make sure we have enough space to handle the data first */ | |
4287 | spin_lock(&data_sinfo->lock); | |
4136135b | 4288 | used = btrfs_space_info_used(data_sinfo, true); |
ab6e2410 JB |
4289 | |
4290 | if (used + bytes > data_sinfo->total_bytes) { | |
4e06bdd6 | 4291 | struct btrfs_trans_handle *trans; |
9ed74f2d | 4292 | |
6a63209f JB |
4293 | /* |
4294 | * if we don't have enough free bytes in this space then we need | |
4295 | * to alloc a new chunk. | |
4296 | */ | |
b9fd47cd | 4297 | if (!data_sinfo->full) { |
6a63209f | 4298 | u64 alloc_target; |
9ed74f2d | 4299 | |
0e4f8f88 | 4300 | data_sinfo->force_alloc = CHUNK_ALLOC_FORCE; |
6a63209f | 4301 | spin_unlock(&data_sinfo->lock); |
1174cade | 4302 | |
1b86826d | 4303 | alloc_target = btrfs_data_alloc_profile(fs_info); |
9dced186 MX |
4304 | /* |
4305 | * It is ugly that we don't call nolock join | |
4306 | * transaction for the free space inode case here. | |
4307 | * But it is safe because we only do the data space | |
4308 | * reservation for the free space cache in the | |
4309 | * transaction context, the common join transaction | |
4310 | * just increase the counter of the current transaction | |
4311 | * handler, doesn't try to acquire the trans_lock of | |
4312 | * the fs. | |
4313 | */ | |
7a7eaa40 | 4314 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
4315 | if (IS_ERR(trans)) |
4316 | return PTR_ERR(trans); | |
9ed74f2d | 4317 | |
2ff7e61e | 4318 | ret = do_chunk_alloc(trans, fs_info, alloc_target, |
0e4f8f88 | 4319 | CHUNK_ALLOC_NO_FORCE); |
3a45bb20 | 4320 | btrfs_end_transaction(trans); |
d52a5b5f MX |
4321 | if (ret < 0) { |
4322 | if (ret != -ENOSPC) | |
4323 | return ret; | |
c99f1b0c ZL |
4324 | else { |
4325 | have_pinned_space = 1; | |
d52a5b5f | 4326 | goto commit_trans; |
c99f1b0c | 4327 | } |
d52a5b5f | 4328 | } |
9ed74f2d | 4329 | |
6a63209f JB |
4330 | goto again; |
4331 | } | |
f2bb8f5c JB |
4332 | |
4333 | /* | |
b150a4f1 | 4334 | * If we don't have enough pinned space to deal with this |
94b947b2 ZL |
4335 | * allocation, and no removed chunk in current transaction, |
4336 | * don't bother committing the transaction. | |
f2bb8f5c | 4337 | */ |
c99f1b0c ZL |
4338 | have_pinned_space = percpu_counter_compare( |
4339 | &data_sinfo->total_bytes_pinned, | |
4340 | used + bytes - data_sinfo->total_bytes); | |
6a63209f | 4341 | spin_unlock(&data_sinfo->lock); |
6a63209f | 4342 | |
4e06bdd6 | 4343 | /* commit the current transaction and try again */ |
d52a5b5f | 4344 | commit_trans: |
92e2f7e3 | 4345 | if (need_commit) { |
c99f1b0c | 4346 | need_commit--; |
b150a4f1 | 4347 | |
e1746e83 | 4348 | if (need_commit > 0) { |
82b3e53b | 4349 | btrfs_start_delalloc_roots(fs_info, -1); |
6374e57a | 4350 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, |
0b246afa | 4351 | (u64)-1); |
e1746e83 | 4352 | } |
9a4e7276 | 4353 | |
7a7eaa40 | 4354 | trans = btrfs_join_transaction(root); |
a22285a6 YZ |
4355 | if (IS_ERR(trans)) |
4356 | return PTR_ERR(trans); | |
c99f1b0c | 4357 | if (have_pinned_space >= 0 || |
3204d33c JB |
4358 | test_bit(BTRFS_TRANS_HAVE_FREE_BGS, |
4359 | &trans->transaction->flags) || | |
c99f1b0c | 4360 | need_commit > 0) { |
3a45bb20 | 4361 | ret = btrfs_commit_transaction(trans); |
94b947b2 ZL |
4362 | if (ret) |
4363 | return ret; | |
d7c15171 | 4364 | /* |
c2d6cb16 FM |
4365 | * The cleaner kthread might still be doing iput |
4366 | * operations. Wait for it to finish so that | |
4367 | * more space is released. | |
d7c15171 | 4368 | */ |
0b246afa JM |
4369 | mutex_lock(&fs_info->cleaner_delayed_iput_mutex); |
4370 | mutex_unlock(&fs_info->cleaner_delayed_iput_mutex); | |
94b947b2 ZL |
4371 | goto again; |
4372 | } else { | |
3a45bb20 | 4373 | btrfs_end_transaction(trans); |
94b947b2 | 4374 | } |
4e06bdd6 | 4375 | } |
9ed74f2d | 4376 | |
0b246afa | 4377 | trace_btrfs_space_reservation(fs_info, |
cab45e22 JM |
4378 | "space_info:enospc", |
4379 | data_sinfo->flags, bytes, 1); | |
6a63209f JB |
4380 | return -ENOSPC; |
4381 | } | |
4382 | data_sinfo->bytes_may_use += bytes; | |
0b246afa | 4383 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 4384 | data_sinfo->flags, bytes, 1); |
6a63209f | 4385 | spin_unlock(&data_sinfo->lock); |
6a63209f | 4386 | |
237c0e9f | 4387 | return ret; |
9ed74f2d | 4388 | } |
6a63209f | 4389 | |
364ecf36 QW |
4390 | int btrfs_check_data_free_space(struct inode *inode, |
4391 | struct extent_changeset **reserved, u64 start, u64 len) | |
4ceff079 | 4392 | { |
0b246afa | 4393 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
4ceff079 QW |
4394 | int ret; |
4395 | ||
4396 | /* align the range */ | |
0b246afa JM |
4397 | len = round_up(start + len, fs_info->sectorsize) - |
4398 | round_down(start, fs_info->sectorsize); | |
4399 | start = round_down(start, fs_info->sectorsize); | |
4ceff079 | 4400 | |
04f4f916 | 4401 | ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), len); |
4ceff079 QW |
4402 | if (ret < 0) |
4403 | return ret; | |
4404 | ||
1e5ec2e7 | 4405 | /* Use new btrfs_qgroup_reserve_data to reserve precious data space. */ |
364ecf36 | 4406 | ret = btrfs_qgroup_reserve_data(inode, reserved, start, len); |
7bc329c1 | 4407 | if (ret < 0) |
1e5ec2e7 | 4408 | btrfs_free_reserved_data_space_noquota(inode, start, len); |
364ecf36 QW |
4409 | else |
4410 | ret = 0; | |
4ceff079 QW |
4411 | return ret; |
4412 | } | |
4413 | ||
4ceff079 QW |
4414 | /* |
4415 | * Called if we need to clear a data reservation for this inode | |
4416 | * Normally in a error case. | |
4417 | * | |
51773bec QW |
4418 | * This one will *NOT* use accurate qgroup reserved space API, just for case |
4419 | * which we can't sleep and is sure it won't affect qgroup reserved space. | |
4420 | * Like clear_bit_hook(). | |
4ceff079 | 4421 | */ |
51773bec QW |
4422 | void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start, |
4423 | u64 len) | |
4ceff079 | 4424 | { |
0b246afa | 4425 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
4ceff079 QW |
4426 | struct btrfs_space_info *data_sinfo; |
4427 | ||
4428 | /* Make sure the range is aligned to sectorsize */ | |
0b246afa JM |
4429 | len = round_up(start + len, fs_info->sectorsize) - |
4430 | round_down(start, fs_info->sectorsize); | |
4431 | start = round_down(start, fs_info->sectorsize); | |
4ceff079 | 4432 | |
0b246afa | 4433 | data_sinfo = fs_info->data_sinfo; |
4ceff079 QW |
4434 | spin_lock(&data_sinfo->lock); |
4435 | if (WARN_ON(data_sinfo->bytes_may_use < len)) | |
4436 | data_sinfo->bytes_may_use = 0; | |
4437 | else | |
4438 | data_sinfo->bytes_may_use -= len; | |
0b246afa | 4439 | trace_btrfs_space_reservation(fs_info, "space_info", |
4ceff079 QW |
4440 | data_sinfo->flags, len, 0); |
4441 | spin_unlock(&data_sinfo->lock); | |
4442 | } | |
4443 | ||
51773bec QW |
4444 | /* |
4445 | * Called if we need to clear a data reservation for this inode | |
4446 | * Normally in a error case. | |
4447 | * | |
01327610 | 4448 | * This one will handle the per-inode data rsv map for accurate reserved |
51773bec QW |
4449 | * space framework. |
4450 | */ | |
bc42bda2 QW |
4451 | void btrfs_free_reserved_data_space(struct inode *inode, |
4452 | struct extent_changeset *reserved, u64 start, u64 len) | |
51773bec | 4453 | { |
0c476a5d JM |
4454 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4455 | ||
4456 | /* Make sure the range is aligned to sectorsize */ | |
da17066c JM |
4457 | len = round_up(start + len, root->fs_info->sectorsize) - |
4458 | round_down(start, root->fs_info->sectorsize); | |
4459 | start = round_down(start, root->fs_info->sectorsize); | |
0c476a5d | 4460 | |
51773bec | 4461 | btrfs_free_reserved_data_space_noquota(inode, start, len); |
bc42bda2 | 4462 | btrfs_qgroup_free_data(inode, reserved, start, len); |
51773bec QW |
4463 | } |
4464 | ||
97e728d4 | 4465 | static void force_metadata_allocation(struct btrfs_fs_info *info) |
e3ccfa98 | 4466 | { |
97e728d4 JB |
4467 | struct list_head *head = &info->space_info; |
4468 | struct btrfs_space_info *found; | |
e3ccfa98 | 4469 | |
97e728d4 JB |
4470 | rcu_read_lock(); |
4471 | list_for_each_entry_rcu(found, head, list) { | |
4472 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
0e4f8f88 | 4473 | found->force_alloc = CHUNK_ALLOC_FORCE; |
e3ccfa98 | 4474 | } |
97e728d4 | 4475 | rcu_read_unlock(); |
e3ccfa98 JB |
4476 | } |
4477 | ||
3c76cd84 MX |
4478 | static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global) |
4479 | { | |
4480 | return (global->size << 1); | |
4481 | } | |
4482 | ||
2ff7e61e | 4483 | static int should_alloc_chunk(struct btrfs_fs_info *fs_info, |
698d0082 | 4484 | struct btrfs_space_info *sinfo, int force) |
32c00aff | 4485 | { |
0b246afa | 4486 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
8d8aafee | 4487 | u64 bytes_used = btrfs_space_info_used(sinfo, false); |
e5bc2458 | 4488 | u64 thresh; |
e3ccfa98 | 4489 | |
0e4f8f88 CM |
4490 | if (force == CHUNK_ALLOC_FORCE) |
4491 | return 1; | |
4492 | ||
fb25e914 JB |
4493 | /* |
4494 | * We need to take into account the global rsv because for all intents | |
4495 | * and purposes it's used space. Don't worry about locking the | |
4496 | * global_rsv, it doesn't change except when the transaction commits. | |
4497 | */ | |
54338b5c | 4498 | if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA) |
8d8aafee | 4499 | bytes_used += calc_global_rsv_need_space(global_rsv); |
fb25e914 | 4500 | |
0e4f8f88 CM |
4501 | /* |
4502 | * in limited mode, we want to have some free space up to | |
4503 | * about 1% of the FS size. | |
4504 | */ | |
4505 | if (force == CHUNK_ALLOC_LIMITED) { | |
0b246afa | 4506 | thresh = btrfs_super_total_bytes(fs_info->super_copy); |
ee22184b | 4507 | thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1)); |
0e4f8f88 | 4508 | |
8d8aafee | 4509 | if (sinfo->total_bytes - bytes_used < thresh) |
0e4f8f88 CM |
4510 | return 1; |
4511 | } | |
0e4f8f88 | 4512 | |
8d8aafee | 4513 | if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8)) |
14ed0ca6 | 4514 | return 0; |
424499db | 4515 | return 1; |
32c00aff JB |
4516 | } |
4517 | ||
2ff7e61e | 4518 | static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type) |
15d1ff81 LB |
4519 | { |
4520 | u64 num_dev; | |
4521 | ||
53b381b3 DW |
4522 | if (type & (BTRFS_BLOCK_GROUP_RAID10 | |
4523 | BTRFS_BLOCK_GROUP_RAID0 | | |
4524 | BTRFS_BLOCK_GROUP_RAID5 | | |
4525 | BTRFS_BLOCK_GROUP_RAID6)) | |
0b246afa | 4526 | num_dev = fs_info->fs_devices->rw_devices; |
15d1ff81 LB |
4527 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
4528 | num_dev = 2; | |
4529 | else | |
4530 | num_dev = 1; /* DUP or single */ | |
4531 | ||
39c2d7fa | 4532 | return num_dev; |
15d1ff81 LB |
4533 | } |
4534 | ||
39c2d7fa FM |
4535 | /* |
4536 | * If @is_allocation is true, reserve space in the system space info necessary | |
4537 | * for allocating a chunk, otherwise if it's false, reserve space necessary for | |
4538 | * removing a chunk. | |
4539 | */ | |
4540 | void check_system_chunk(struct btrfs_trans_handle *trans, | |
2ff7e61e | 4541 | struct btrfs_fs_info *fs_info, u64 type) |
15d1ff81 LB |
4542 | { |
4543 | struct btrfs_space_info *info; | |
4544 | u64 left; | |
4545 | u64 thresh; | |
4fbcdf66 | 4546 | int ret = 0; |
39c2d7fa | 4547 | u64 num_devs; |
4fbcdf66 FM |
4548 | |
4549 | /* | |
4550 | * Needed because we can end up allocating a system chunk and for an | |
4551 | * atomic and race free space reservation in the chunk block reserve. | |
4552 | */ | |
a32bf9a3 | 4553 | lockdep_assert_held(&fs_info->chunk_mutex); |
15d1ff81 | 4554 | |
0b246afa | 4555 | info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
15d1ff81 | 4556 | spin_lock(&info->lock); |
4136135b | 4557 | left = info->total_bytes - btrfs_space_info_used(info, true); |
15d1ff81 LB |
4558 | spin_unlock(&info->lock); |
4559 | ||
2ff7e61e | 4560 | num_devs = get_profile_num_devs(fs_info, type); |
39c2d7fa FM |
4561 | |
4562 | /* num_devs device items to update and 1 chunk item to add or remove */ | |
0b246afa JM |
4563 | thresh = btrfs_calc_trunc_metadata_size(fs_info, num_devs) + |
4564 | btrfs_calc_trans_metadata_size(fs_info, 1); | |
39c2d7fa | 4565 | |
0b246afa JM |
4566 | if (left < thresh && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
4567 | btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu", | |
4568 | left, thresh, type); | |
4569 | dump_space_info(fs_info, info, 0, 0); | |
15d1ff81 LB |
4570 | } |
4571 | ||
4572 | if (left < thresh) { | |
1b86826d | 4573 | u64 flags = btrfs_system_alloc_profile(fs_info); |
15d1ff81 | 4574 | |
4fbcdf66 FM |
4575 | /* |
4576 | * Ignore failure to create system chunk. We might end up not | |
4577 | * needing it, as we might not need to COW all nodes/leafs from | |
4578 | * the paths we visit in the chunk tree (they were already COWed | |
4579 | * or created in the current transaction for example). | |
4580 | */ | |
2ff7e61e | 4581 | ret = btrfs_alloc_chunk(trans, fs_info, flags); |
4fbcdf66 FM |
4582 | } |
4583 | ||
4584 | if (!ret) { | |
0b246afa JM |
4585 | ret = btrfs_block_rsv_add(fs_info->chunk_root, |
4586 | &fs_info->chunk_block_rsv, | |
4fbcdf66 FM |
4587 | thresh, BTRFS_RESERVE_NO_FLUSH); |
4588 | if (!ret) | |
4589 | trans->chunk_bytes_reserved += thresh; | |
15d1ff81 LB |
4590 | } |
4591 | } | |
4592 | ||
28b737f6 LB |
4593 | /* |
4594 | * If force is CHUNK_ALLOC_FORCE: | |
4595 | * - return 1 if it successfully allocates a chunk, | |
4596 | * - return errors including -ENOSPC otherwise. | |
4597 | * If force is NOT CHUNK_ALLOC_FORCE: | |
4598 | * - return 0 if it doesn't need to allocate a new chunk, | |
4599 | * - return 1 if it successfully allocates a chunk, | |
4600 | * - return errors including -ENOSPC otherwise. | |
4601 | */ | |
6324fbf3 | 4602 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
2ff7e61e | 4603 | struct btrfs_fs_info *fs_info, u64 flags, int force) |
9ed74f2d | 4604 | { |
6324fbf3 | 4605 | struct btrfs_space_info *space_info; |
6d74119f | 4606 | int wait_for_alloc = 0; |
9ed74f2d | 4607 | int ret = 0; |
9ed74f2d | 4608 | |
c6b305a8 JB |
4609 | /* Don't re-enter if we're already allocating a chunk */ |
4610 | if (trans->allocating_chunk) | |
4611 | return -ENOSPC; | |
4612 | ||
0b246afa | 4613 | space_info = __find_space_info(fs_info, flags); |
dc2d3005 | 4614 | ASSERT(space_info); |
9ed74f2d | 4615 | |
6d74119f | 4616 | again: |
25179201 | 4617 | spin_lock(&space_info->lock); |
9e622d6b | 4618 | if (force < space_info->force_alloc) |
0e4f8f88 | 4619 | force = space_info->force_alloc; |
25179201 | 4620 | if (space_info->full) { |
2ff7e61e | 4621 | if (should_alloc_chunk(fs_info, space_info, force)) |
09fb99a6 FDBM |
4622 | ret = -ENOSPC; |
4623 | else | |
4624 | ret = 0; | |
25179201 | 4625 | spin_unlock(&space_info->lock); |
09fb99a6 | 4626 | return ret; |
9ed74f2d JB |
4627 | } |
4628 | ||
2ff7e61e | 4629 | if (!should_alloc_chunk(fs_info, space_info, force)) { |
25179201 | 4630 | spin_unlock(&space_info->lock); |
6d74119f JB |
4631 | return 0; |
4632 | } else if (space_info->chunk_alloc) { | |
4633 | wait_for_alloc = 1; | |
4634 | } else { | |
4635 | space_info->chunk_alloc = 1; | |
9ed74f2d | 4636 | } |
0e4f8f88 | 4637 | |
25179201 | 4638 | spin_unlock(&space_info->lock); |
9ed74f2d | 4639 | |
6d74119f JB |
4640 | mutex_lock(&fs_info->chunk_mutex); |
4641 | ||
4642 | /* | |
4643 | * The chunk_mutex is held throughout the entirety of a chunk | |
4644 | * allocation, so once we've acquired the chunk_mutex we know that the | |
4645 | * other guy is done and we need to recheck and see if we should | |
4646 | * allocate. | |
4647 | */ | |
4648 | if (wait_for_alloc) { | |
4649 | mutex_unlock(&fs_info->chunk_mutex); | |
4650 | wait_for_alloc = 0; | |
1e1c50a9 | 4651 | cond_resched(); |
6d74119f JB |
4652 | goto again; |
4653 | } | |
4654 | ||
c6b305a8 JB |
4655 | trans->allocating_chunk = true; |
4656 | ||
67377734 JB |
4657 | /* |
4658 | * If we have mixed data/metadata chunks we want to make sure we keep | |
4659 | * allocating mixed chunks instead of individual chunks. | |
4660 | */ | |
4661 | if (btrfs_mixed_space_info(space_info)) | |
4662 | flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); | |
4663 | ||
97e728d4 JB |
4664 | /* |
4665 | * if we're doing a data chunk, go ahead and make sure that | |
4666 | * we keep a reasonable number of metadata chunks allocated in the | |
4667 | * FS as well. | |
4668 | */ | |
9ed74f2d | 4669 | if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { |
97e728d4 JB |
4670 | fs_info->data_chunk_allocations++; |
4671 | if (!(fs_info->data_chunk_allocations % | |
4672 | fs_info->metadata_ratio)) | |
4673 | force_metadata_allocation(fs_info); | |
9ed74f2d JB |
4674 | } |
4675 | ||
15d1ff81 LB |
4676 | /* |
4677 | * Check if we have enough space in SYSTEM chunk because we may need | |
4678 | * to update devices. | |
4679 | */ | |
2ff7e61e | 4680 | check_system_chunk(trans, fs_info, flags); |
15d1ff81 | 4681 | |
2ff7e61e | 4682 | ret = btrfs_alloc_chunk(trans, fs_info, flags); |
c6b305a8 | 4683 | trans->allocating_chunk = false; |
92b8e897 | 4684 | |
9ed74f2d | 4685 | spin_lock(&space_info->lock); |
57f1642e NB |
4686 | if (ret < 0) { |
4687 | if (ret == -ENOSPC) | |
4688 | space_info->full = 1; | |
4689 | else | |
4690 | goto out; | |
4691 | } else { | |
424499db | 4692 | ret = 1; |
57f1642e | 4693 | } |
6d74119f | 4694 | |
0e4f8f88 | 4695 | space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; |
a81cb9a2 | 4696 | out: |
6d74119f | 4697 | space_info->chunk_alloc = 0; |
9ed74f2d | 4698 | spin_unlock(&space_info->lock); |
a25c75d5 | 4699 | mutex_unlock(&fs_info->chunk_mutex); |
00d80e34 FM |
4700 | /* |
4701 | * When we allocate a new chunk we reserve space in the chunk block | |
4702 | * reserve to make sure we can COW nodes/leafs in the chunk tree or | |
4703 | * add new nodes/leafs to it if we end up needing to do it when | |
4704 | * inserting the chunk item and updating device items as part of the | |
4705 | * second phase of chunk allocation, performed by | |
4706 | * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a | |
4707 | * large number of new block groups to create in our transaction | |
4708 | * handle's new_bgs list to avoid exhausting the chunk block reserve | |
4709 | * in extreme cases - like having a single transaction create many new | |
4710 | * block groups when starting to write out the free space caches of all | |
4711 | * the block groups that were made dirty during the lifetime of the | |
4712 | * transaction. | |
4713 | */ | |
d9a0540a | 4714 | if (trans->can_flush_pending_bgs && |
ee22184b | 4715 | trans->chunk_bytes_reserved >= (u64)SZ_2M) { |
6c686b35 | 4716 | btrfs_create_pending_block_groups(trans); |
00d80e34 FM |
4717 | btrfs_trans_release_chunk_metadata(trans); |
4718 | } | |
0f9dd46c | 4719 | return ret; |
6324fbf3 | 4720 | } |
9ed74f2d | 4721 | |
c1c4919b | 4722 | static int can_overcommit(struct btrfs_fs_info *fs_info, |
a80c8dcf | 4723 | struct btrfs_space_info *space_info, u64 bytes, |
c1c4919b JM |
4724 | enum btrfs_reserve_flush_enum flush, |
4725 | bool system_chunk) | |
a80c8dcf | 4726 | { |
0b246afa | 4727 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
957780eb | 4728 | u64 profile; |
3c76cd84 | 4729 | u64 space_size; |
a80c8dcf JB |
4730 | u64 avail; |
4731 | u64 used; | |
4732 | ||
957780eb JB |
4733 | /* Don't overcommit when in mixed mode. */ |
4734 | if (space_info->flags & BTRFS_BLOCK_GROUP_DATA) | |
4735 | return 0; | |
4736 | ||
c1c4919b JM |
4737 | if (system_chunk) |
4738 | profile = btrfs_system_alloc_profile(fs_info); | |
4739 | else | |
4740 | profile = btrfs_metadata_alloc_profile(fs_info); | |
4741 | ||
4136135b | 4742 | used = btrfs_space_info_used(space_info, false); |
96f1bb57 | 4743 | |
96f1bb57 JB |
4744 | /* |
4745 | * We only want to allow over committing if we have lots of actual space | |
4746 | * free, but if we don't have enough space to handle the global reserve | |
4747 | * space then we could end up having a real enospc problem when trying | |
4748 | * to allocate a chunk or some other such important allocation. | |
4749 | */ | |
3c76cd84 MX |
4750 | spin_lock(&global_rsv->lock); |
4751 | space_size = calc_global_rsv_need_space(global_rsv); | |
4752 | spin_unlock(&global_rsv->lock); | |
4753 | if (used + space_size >= space_info->total_bytes) | |
96f1bb57 JB |
4754 | return 0; |
4755 | ||
4756 | used += space_info->bytes_may_use; | |
a80c8dcf | 4757 | |
a5ed45f8 | 4758 | avail = atomic64_read(&fs_info->free_chunk_space); |
a80c8dcf JB |
4759 | |
4760 | /* | |
4761 | * If we have dup, raid1 or raid10 then only half of the free | |
53b381b3 DW |
4762 | * space is actually useable. For raid56, the space info used |
4763 | * doesn't include the parity drive, so we don't have to | |
4764 | * change the math | |
a80c8dcf JB |
4765 | */ |
4766 | if (profile & (BTRFS_BLOCK_GROUP_DUP | | |
4767 | BTRFS_BLOCK_GROUP_RAID1 | | |
4768 | BTRFS_BLOCK_GROUP_RAID10)) | |
4769 | avail >>= 1; | |
4770 | ||
4771 | /* | |
561c294d MX |
4772 | * If we aren't flushing all things, let us overcommit up to |
4773 | * 1/2th of the space. If we can flush, don't let us overcommit | |
4774 | * too much, let it overcommit up to 1/8 of the space. | |
a80c8dcf | 4775 | */ |
08e007d2 | 4776 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
14575aef | 4777 | avail >>= 3; |
a80c8dcf | 4778 | else |
14575aef | 4779 | avail >>= 1; |
a80c8dcf | 4780 | |
14575aef | 4781 | if (used + bytes < space_info->total_bytes + avail) |
a80c8dcf JB |
4782 | return 1; |
4783 | return 0; | |
4784 | } | |
4785 | ||
2ff7e61e | 4786 | static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info, |
6c255e67 | 4787 | unsigned long nr_pages, int nr_items) |
da633a42 | 4788 | { |
0b246afa | 4789 | struct super_block *sb = fs_info->sb; |
da633a42 | 4790 | |
925a6efb JB |
4791 | if (down_read_trylock(&sb->s_umount)) { |
4792 | writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); | |
4793 | up_read(&sb->s_umount); | |
4794 | } else { | |
da633a42 MX |
4795 | /* |
4796 | * We needn't worry the filesystem going from r/w to r/o though | |
4797 | * we don't acquire ->s_umount mutex, because the filesystem | |
4798 | * should guarantee the delalloc inodes list be empty after | |
4799 | * the filesystem is readonly(all dirty pages are written to | |
4800 | * the disk). | |
4801 | */ | |
82b3e53b | 4802 | btrfs_start_delalloc_roots(fs_info, nr_items); |
98ad69cf | 4803 | if (!current->journal_info) |
0b246afa | 4804 | btrfs_wait_ordered_roots(fs_info, nr_items, 0, (u64)-1); |
da633a42 MX |
4805 | } |
4806 | } | |
4807 | ||
6374e57a | 4808 | static inline u64 calc_reclaim_items_nr(struct btrfs_fs_info *fs_info, |
2ff7e61e | 4809 | u64 to_reclaim) |
18cd8ea6 MX |
4810 | { |
4811 | u64 bytes; | |
6374e57a | 4812 | u64 nr; |
18cd8ea6 | 4813 | |
2ff7e61e | 4814 | bytes = btrfs_calc_trans_metadata_size(fs_info, 1); |
6374e57a | 4815 | nr = div64_u64(to_reclaim, bytes); |
18cd8ea6 MX |
4816 | if (!nr) |
4817 | nr = 1; | |
4818 | return nr; | |
4819 | } | |
4820 | ||
ee22184b | 4821 | #define EXTENT_SIZE_PER_ITEM SZ_256K |
c61a16a7 | 4822 | |
9ed74f2d | 4823 | /* |
5da9d01b | 4824 | * shrink metadata reservation for delalloc |
9ed74f2d | 4825 | */ |
c1c4919b JM |
4826 | static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim, |
4827 | u64 orig, bool wait_ordered) | |
5da9d01b | 4828 | { |
0019f10d | 4829 | struct btrfs_space_info *space_info; |
663350ac | 4830 | struct btrfs_trans_handle *trans; |
f4c738c2 | 4831 | u64 delalloc_bytes; |
5da9d01b | 4832 | u64 max_reclaim; |
6374e57a | 4833 | u64 items; |
b1953bce | 4834 | long time_left; |
d3ee29e3 MX |
4835 | unsigned long nr_pages; |
4836 | int loops; | |
5da9d01b | 4837 | |
c61a16a7 | 4838 | /* Calc the number of the pages we need flush for space reservation */ |
2ff7e61e | 4839 | items = calc_reclaim_items_nr(fs_info, to_reclaim); |
6374e57a | 4840 | to_reclaim = items * EXTENT_SIZE_PER_ITEM; |
c61a16a7 | 4841 | |
663350ac | 4842 | trans = (struct btrfs_trans_handle *)current->journal_info; |
69fe2d75 | 4843 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
bf9022e0 | 4844 | |
963d678b | 4845 | delalloc_bytes = percpu_counter_sum_positive( |
0b246afa | 4846 | &fs_info->delalloc_bytes); |
f4c738c2 | 4847 | if (delalloc_bytes == 0) { |
fdb5effd | 4848 | if (trans) |
f4c738c2 | 4849 | return; |
38c135af | 4850 | if (wait_ordered) |
0b246afa | 4851 | btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1); |
f4c738c2 | 4852 | return; |
fdb5effd JB |
4853 | } |
4854 | ||
d3ee29e3 | 4855 | loops = 0; |
f4c738c2 JB |
4856 | while (delalloc_bytes && loops < 3) { |
4857 | max_reclaim = min(delalloc_bytes, to_reclaim); | |
09cbfeaf | 4858 | nr_pages = max_reclaim >> PAGE_SHIFT; |
2ff7e61e | 4859 | btrfs_writeback_inodes_sb_nr(fs_info, nr_pages, items); |
dea31f52 JB |
4860 | /* |
4861 | * We need to wait for the async pages to actually start before | |
4862 | * we do anything. | |
4863 | */ | |
0b246afa | 4864 | max_reclaim = atomic_read(&fs_info->async_delalloc_pages); |
9f3a074d MX |
4865 | if (!max_reclaim) |
4866 | goto skip_async; | |
4867 | ||
4868 | if (max_reclaim <= nr_pages) | |
4869 | max_reclaim = 0; | |
4870 | else | |
4871 | max_reclaim -= nr_pages; | |
dea31f52 | 4872 | |
0b246afa JM |
4873 | wait_event(fs_info->async_submit_wait, |
4874 | atomic_read(&fs_info->async_delalloc_pages) <= | |
9f3a074d MX |
4875 | (int)max_reclaim); |
4876 | skip_async: | |
0019f10d | 4877 | spin_lock(&space_info->lock); |
957780eb JB |
4878 | if (list_empty(&space_info->tickets) && |
4879 | list_empty(&space_info->priority_tickets)) { | |
4880 | spin_unlock(&space_info->lock); | |
4881 | break; | |
4882 | } | |
0019f10d | 4883 | spin_unlock(&space_info->lock); |
5da9d01b | 4884 | |
36e39c40 | 4885 | loops++; |
f104d044 | 4886 | if (wait_ordered && !trans) { |
0b246afa | 4887 | btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1); |
f104d044 | 4888 | } else { |
f4c738c2 | 4889 | time_left = schedule_timeout_killable(1); |
f104d044 JB |
4890 | if (time_left) |
4891 | break; | |
4892 | } | |
963d678b | 4893 | delalloc_bytes = percpu_counter_sum_positive( |
0b246afa | 4894 | &fs_info->delalloc_bytes); |
5da9d01b | 4895 | } |
5da9d01b YZ |
4896 | } |
4897 | ||
996478ca JB |
4898 | struct reserve_ticket { |
4899 | u64 bytes; | |
4900 | int error; | |
4901 | struct list_head list; | |
4902 | wait_queue_head_t wait; | |
4903 | }; | |
4904 | ||
663350ac JB |
4905 | /** |
4906 | * maybe_commit_transaction - possibly commit the transaction if its ok to | |
4907 | * @root - the root we're allocating for | |
4908 | * @bytes - the number of bytes we want to reserve | |
4909 | * @force - force the commit | |
8bb8ab2e | 4910 | * |
663350ac JB |
4911 | * This will check to make sure that committing the transaction will actually |
4912 | * get us somewhere and then commit the transaction if it does. Otherwise it | |
4913 | * will return -ENOSPC. | |
8bb8ab2e | 4914 | */ |
0c9ab349 | 4915 | static int may_commit_transaction(struct btrfs_fs_info *fs_info, |
996478ca | 4916 | struct btrfs_space_info *space_info) |
663350ac | 4917 | { |
996478ca | 4918 | struct reserve_ticket *ticket = NULL; |
0b246afa | 4919 | struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_block_rsv; |
663350ac | 4920 | struct btrfs_trans_handle *trans; |
996478ca | 4921 | u64 bytes; |
663350ac JB |
4922 | |
4923 | trans = (struct btrfs_trans_handle *)current->journal_info; | |
4924 | if (trans) | |
4925 | return -EAGAIN; | |
4926 | ||
996478ca JB |
4927 | spin_lock(&space_info->lock); |
4928 | if (!list_empty(&space_info->priority_tickets)) | |
4929 | ticket = list_first_entry(&space_info->priority_tickets, | |
4930 | struct reserve_ticket, list); | |
4931 | else if (!list_empty(&space_info->tickets)) | |
4932 | ticket = list_first_entry(&space_info->tickets, | |
4933 | struct reserve_ticket, list); | |
4934 | bytes = (ticket) ? ticket->bytes : 0; | |
4935 | spin_unlock(&space_info->lock); | |
4936 | ||
4937 | if (!bytes) | |
4938 | return 0; | |
663350ac JB |
4939 | |
4940 | /* See if there is enough pinned space to make this reservation */ | |
b150a4f1 | 4941 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
0424c548 | 4942 | bytes) >= 0) |
663350ac | 4943 | goto commit; |
663350ac JB |
4944 | |
4945 | /* | |
4946 | * See if there is some space in the delayed insertion reservation for | |
4947 | * this reservation. | |
4948 | */ | |
4949 | if (space_info != delayed_rsv->space_info) | |
4950 | return -ENOSPC; | |
4951 | ||
4952 | spin_lock(&delayed_rsv->lock); | |
996478ca JB |
4953 | if (delayed_rsv->size > bytes) |
4954 | bytes = 0; | |
4955 | else | |
4956 | bytes -= delayed_rsv->size; | |
057aac3e NB |
4957 | spin_unlock(&delayed_rsv->lock); |
4958 | ||
b150a4f1 | 4959 | if (percpu_counter_compare(&space_info->total_bytes_pinned, |
996478ca | 4960 | bytes) < 0) { |
663350ac JB |
4961 | return -ENOSPC; |
4962 | } | |
663350ac JB |
4963 | |
4964 | commit: | |
a9b3311e | 4965 | trans = btrfs_join_transaction(fs_info->extent_root); |
663350ac JB |
4966 | if (IS_ERR(trans)) |
4967 | return -ENOSPC; | |
4968 | ||
3a45bb20 | 4969 | return btrfs_commit_transaction(trans); |
663350ac JB |
4970 | } |
4971 | ||
e38ae7a0 NB |
4972 | /* |
4973 | * Try to flush some data based on policy set by @state. This is only advisory | |
4974 | * and may fail for various reasons. The caller is supposed to examine the | |
4975 | * state of @space_info to detect the outcome. | |
4976 | */ | |
4977 | static void flush_space(struct btrfs_fs_info *fs_info, | |
96c3f433 | 4978 | struct btrfs_space_info *space_info, u64 num_bytes, |
7bdd6277 | 4979 | int state) |
96c3f433 | 4980 | { |
a9b3311e | 4981 | struct btrfs_root *root = fs_info->extent_root; |
96c3f433 JB |
4982 | struct btrfs_trans_handle *trans; |
4983 | int nr; | |
f4c738c2 | 4984 | int ret = 0; |
96c3f433 JB |
4985 | |
4986 | switch (state) { | |
96c3f433 JB |
4987 | case FLUSH_DELAYED_ITEMS_NR: |
4988 | case FLUSH_DELAYED_ITEMS: | |
18cd8ea6 | 4989 | if (state == FLUSH_DELAYED_ITEMS_NR) |
2ff7e61e | 4990 | nr = calc_reclaim_items_nr(fs_info, num_bytes) * 2; |
18cd8ea6 | 4991 | else |
96c3f433 | 4992 | nr = -1; |
18cd8ea6 | 4993 | |
96c3f433 JB |
4994 | trans = btrfs_join_transaction(root); |
4995 | if (IS_ERR(trans)) { | |
4996 | ret = PTR_ERR(trans); | |
4997 | break; | |
4998 | } | |
e5c304e6 | 4999 | ret = btrfs_run_delayed_items_nr(trans, nr); |
3a45bb20 | 5000 | btrfs_end_transaction(trans); |
96c3f433 | 5001 | break; |
67b0fd63 JB |
5002 | case FLUSH_DELALLOC: |
5003 | case FLUSH_DELALLOC_WAIT: | |
7bdd6277 | 5004 | shrink_delalloc(fs_info, num_bytes * 2, num_bytes, |
67b0fd63 JB |
5005 | state == FLUSH_DELALLOC_WAIT); |
5006 | break; | |
ea658bad JB |
5007 | case ALLOC_CHUNK: |
5008 | trans = btrfs_join_transaction(root); | |
5009 | if (IS_ERR(trans)) { | |
5010 | ret = PTR_ERR(trans); | |
5011 | break; | |
5012 | } | |
2ff7e61e | 5013 | ret = do_chunk_alloc(trans, fs_info, |
1b86826d | 5014 | btrfs_metadata_alloc_profile(fs_info), |
ea658bad | 5015 | CHUNK_ALLOC_NO_FORCE); |
3a45bb20 | 5016 | btrfs_end_transaction(trans); |
eecba891 | 5017 | if (ret > 0 || ret == -ENOSPC) |
ea658bad JB |
5018 | ret = 0; |
5019 | break; | |
96c3f433 | 5020 | case COMMIT_TRANS: |
996478ca | 5021 | ret = may_commit_transaction(fs_info, space_info); |
96c3f433 JB |
5022 | break; |
5023 | default: | |
5024 | ret = -ENOSPC; | |
5025 | break; | |
5026 | } | |
5027 | ||
7bdd6277 NB |
5028 | trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state, |
5029 | ret); | |
e38ae7a0 | 5030 | return; |
96c3f433 | 5031 | } |
21c7e756 MX |
5032 | |
5033 | static inline u64 | |
c1c4919b JM |
5034 | btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info *fs_info, |
5035 | struct btrfs_space_info *space_info, | |
5036 | bool system_chunk) | |
21c7e756 | 5037 | { |
957780eb | 5038 | struct reserve_ticket *ticket; |
21c7e756 MX |
5039 | u64 used; |
5040 | u64 expected; | |
957780eb | 5041 | u64 to_reclaim = 0; |
21c7e756 | 5042 | |
957780eb JB |
5043 | list_for_each_entry(ticket, &space_info->tickets, list) |
5044 | to_reclaim += ticket->bytes; | |
5045 | list_for_each_entry(ticket, &space_info->priority_tickets, list) | |
5046 | to_reclaim += ticket->bytes; | |
5047 | if (to_reclaim) | |
5048 | return to_reclaim; | |
21c7e756 | 5049 | |
e0af2484 | 5050 | to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M); |
c1c4919b JM |
5051 | if (can_overcommit(fs_info, space_info, to_reclaim, |
5052 | BTRFS_RESERVE_FLUSH_ALL, system_chunk)) | |
e0af2484 WX |
5053 | return 0; |
5054 | ||
0eee8a49 NB |
5055 | used = btrfs_space_info_used(space_info, true); |
5056 | ||
c1c4919b JM |
5057 | if (can_overcommit(fs_info, space_info, SZ_1M, |
5058 | BTRFS_RESERVE_FLUSH_ALL, system_chunk)) | |
21c7e756 MX |
5059 | expected = div_factor_fine(space_info->total_bytes, 95); |
5060 | else | |
5061 | expected = div_factor_fine(space_info->total_bytes, 90); | |
5062 | ||
5063 | if (used > expected) | |
5064 | to_reclaim = used - expected; | |
5065 | else | |
5066 | to_reclaim = 0; | |
5067 | to_reclaim = min(to_reclaim, space_info->bytes_may_use + | |
5068 | space_info->bytes_reserved); | |
21c7e756 MX |
5069 | return to_reclaim; |
5070 | } | |
5071 | ||
c1c4919b JM |
5072 | static inline int need_do_async_reclaim(struct btrfs_fs_info *fs_info, |
5073 | struct btrfs_space_info *space_info, | |
5074 | u64 used, bool system_chunk) | |
21c7e756 | 5075 | { |
365c5313 JB |
5076 | u64 thresh = div_factor_fine(space_info->total_bytes, 98); |
5077 | ||
5078 | /* If we're just plain full then async reclaim just slows us down. */ | |
baee8790 | 5079 | if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh) |
365c5313 JB |
5080 | return 0; |
5081 | ||
c1c4919b JM |
5082 | if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
5083 | system_chunk)) | |
d38b349c JB |
5084 | return 0; |
5085 | ||
0b246afa JM |
5086 | return (used >= thresh && !btrfs_fs_closing(fs_info) && |
5087 | !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)); | |
21c7e756 MX |
5088 | } |
5089 | ||
957780eb | 5090 | static void wake_all_tickets(struct list_head *head) |
21c7e756 | 5091 | { |
957780eb | 5092 | struct reserve_ticket *ticket; |
25ce459c | 5093 | |
957780eb JB |
5094 | while (!list_empty(head)) { |
5095 | ticket = list_first_entry(head, struct reserve_ticket, list); | |
5096 | list_del_init(&ticket->list); | |
5097 | ticket->error = -ENOSPC; | |
5098 | wake_up(&ticket->wait); | |
21c7e756 | 5099 | } |
21c7e756 MX |
5100 | } |
5101 | ||
957780eb JB |
5102 | /* |
5103 | * This is for normal flushers, we can wait all goddamned day if we want to. We | |
5104 | * will loop and continuously try to flush as long as we are making progress. | |
5105 | * We count progress as clearing off tickets each time we have to loop. | |
5106 | */ | |
21c7e756 MX |
5107 | static void btrfs_async_reclaim_metadata_space(struct work_struct *work) |
5108 | { | |
5109 | struct btrfs_fs_info *fs_info; | |
5110 | struct btrfs_space_info *space_info; | |
5111 | u64 to_reclaim; | |
5112 | int flush_state; | |
957780eb | 5113 | int commit_cycles = 0; |
ce129655 | 5114 | u64 last_tickets_id; |
21c7e756 MX |
5115 | |
5116 | fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work); | |
5117 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); | |
5118 | ||
957780eb | 5119 | spin_lock(&space_info->lock); |
c1c4919b JM |
5120 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
5121 | false); | |
957780eb JB |
5122 | if (!to_reclaim) { |
5123 | space_info->flush = 0; | |
5124 | spin_unlock(&space_info->lock); | |
21c7e756 | 5125 | return; |
957780eb | 5126 | } |
ce129655 | 5127 | last_tickets_id = space_info->tickets_id; |
957780eb | 5128 | spin_unlock(&space_info->lock); |
21c7e756 MX |
5129 | |
5130 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
957780eb | 5131 | do { |
e38ae7a0 | 5132 | flush_space(fs_info, space_info, to_reclaim, flush_state); |
957780eb JB |
5133 | spin_lock(&space_info->lock); |
5134 | if (list_empty(&space_info->tickets)) { | |
5135 | space_info->flush = 0; | |
5136 | spin_unlock(&space_info->lock); | |
5137 | return; | |
5138 | } | |
c1c4919b JM |
5139 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, |
5140 | space_info, | |
5141 | false); | |
ce129655 | 5142 | if (last_tickets_id == space_info->tickets_id) { |
957780eb JB |
5143 | flush_state++; |
5144 | } else { | |
ce129655 | 5145 | last_tickets_id = space_info->tickets_id; |
957780eb JB |
5146 | flush_state = FLUSH_DELAYED_ITEMS_NR; |
5147 | if (commit_cycles) | |
5148 | commit_cycles--; | |
5149 | } | |
5150 | ||
5151 | if (flush_state > COMMIT_TRANS) { | |
5152 | commit_cycles++; | |
5153 | if (commit_cycles > 2) { | |
5154 | wake_all_tickets(&space_info->tickets); | |
5155 | space_info->flush = 0; | |
5156 | } else { | |
5157 | flush_state = FLUSH_DELAYED_ITEMS_NR; | |
5158 | } | |
5159 | } | |
5160 | spin_unlock(&space_info->lock); | |
5161 | } while (flush_state <= COMMIT_TRANS); | |
5162 | } | |
5163 | ||
5164 | void btrfs_init_async_reclaim_work(struct work_struct *work) | |
5165 | { | |
5166 | INIT_WORK(work, btrfs_async_reclaim_metadata_space); | |
5167 | } | |
5168 | ||
5169 | static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, | |
5170 | struct btrfs_space_info *space_info, | |
5171 | struct reserve_ticket *ticket) | |
5172 | { | |
5173 | u64 to_reclaim; | |
5174 | int flush_state = FLUSH_DELAYED_ITEMS_NR; | |
5175 | ||
5176 | spin_lock(&space_info->lock); | |
c1c4919b JM |
5177 | to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info, |
5178 | false); | |
957780eb JB |
5179 | if (!to_reclaim) { |
5180 | spin_unlock(&space_info->lock); | |
5181 | return; | |
5182 | } | |
5183 | spin_unlock(&space_info->lock); | |
5184 | ||
21c7e756 | 5185 | do { |
7bdd6277 | 5186 | flush_space(fs_info, space_info, to_reclaim, flush_state); |
21c7e756 | 5187 | flush_state++; |
957780eb JB |
5188 | spin_lock(&space_info->lock); |
5189 | if (ticket->bytes == 0) { | |
5190 | spin_unlock(&space_info->lock); | |
21c7e756 | 5191 | return; |
957780eb JB |
5192 | } |
5193 | spin_unlock(&space_info->lock); | |
5194 | ||
5195 | /* | |
5196 | * Priority flushers can't wait on delalloc without | |
5197 | * deadlocking. | |
5198 | */ | |
5199 | if (flush_state == FLUSH_DELALLOC || | |
5200 | flush_state == FLUSH_DELALLOC_WAIT) | |
5201 | flush_state = ALLOC_CHUNK; | |
365c5313 | 5202 | } while (flush_state < COMMIT_TRANS); |
21c7e756 MX |
5203 | } |
5204 | ||
957780eb JB |
5205 | static int wait_reserve_ticket(struct btrfs_fs_info *fs_info, |
5206 | struct btrfs_space_info *space_info, | |
5207 | struct reserve_ticket *ticket, u64 orig_bytes) | |
5208 | ||
21c7e756 | 5209 | { |
957780eb JB |
5210 | DEFINE_WAIT(wait); |
5211 | int ret = 0; | |
5212 | ||
5213 | spin_lock(&space_info->lock); | |
5214 | while (ticket->bytes > 0 && ticket->error == 0) { | |
5215 | ret = prepare_to_wait_event(&ticket->wait, &wait, TASK_KILLABLE); | |
5216 | if (ret) { | |
5217 | ret = -EINTR; | |
5218 | break; | |
5219 | } | |
5220 | spin_unlock(&space_info->lock); | |
5221 | ||
5222 | schedule(); | |
5223 | ||
5224 | finish_wait(&ticket->wait, &wait); | |
5225 | spin_lock(&space_info->lock); | |
5226 | } | |
5227 | if (!ret) | |
5228 | ret = ticket->error; | |
5229 | if (!list_empty(&ticket->list)) | |
5230 | list_del_init(&ticket->list); | |
5231 | if (ticket->bytes && ticket->bytes < orig_bytes) { | |
5232 | u64 num_bytes = orig_bytes - ticket->bytes; | |
5233 | space_info->bytes_may_use -= num_bytes; | |
5234 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5235 | space_info->flags, num_bytes, 0); | |
5236 | } | |
5237 | spin_unlock(&space_info->lock); | |
5238 | ||
5239 | return ret; | |
21c7e756 MX |
5240 | } |
5241 | ||
4a92b1b8 JB |
5242 | /** |
5243 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
5244 | * @root - the root we're allocating for | |
957780eb | 5245 | * @space_info - the space info we want to allocate from |
4a92b1b8 | 5246 | * @orig_bytes - the number of bytes we want |
48fc7f7e | 5247 | * @flush - whether or not we can flush to make our reservation |
8bb8ab2e | 5248 | * |
01327610 | 5249 | * This will reserve orig_bytes number of bytes from the space info associated |
4a92b1b8 JB |
5250 | * with the block_rsv. If there is not enough space it will make an attempt to |
5251 | * flush out space to make room. It will do this by flushing delalloc if | |
5252 | * possible or committing the transaction. If flush is 0 then no attempts to | |
5253 | * regain reservations will be made and this will fail if there is not enough | |
5254 | * space already. | |
8bb8ab2e | 5255 | */ |
c1c4919b | 5256 | static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info, |
957780eb JB |
5257 | struct btrfs_space_info *space_info, |
5258 | u64 orig_bytes, | |
c1c4919b JM |
5259 | enum btrfs_reserve_flush_enum flush, |
5260 | bool system_chunk) | |
9ed74f2d | 5261 | { |
957780eb | 5262 | struct reserve_ticket ticket; |
2bf64758 | 5263 | u64 used; |
8bb8ab2e | 5264 | int ret = 0; |
9ed74f2d | 5265 | |
957780eb | 5266 | ASSERT(orig_bytes); |
8ca17f0f | 5267 | ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL); |
fdb5effd | 5268 | |
8bb8ab2e | 5269 | spin_lock(&space_info->lock); |
fdb5effd | 5270 | ret = -ENOSPC; |
4136135b | 5271 | used = btrfs_space_info_used(space_info, true); |
9ed74f2d | 5272 | |
8bb8ab2e | 5273 | /* |
957780eb JB |
5274 | * If we have enough space then hooray, make our reservation and carry |
5275 | * on. If not see if we can overcommit, and if we can, hooray carry on. | |
5276 | * If not things get more complicated. | |
8bb8ab2e | 5277 | */ |
957780eb JB |
5278 | if (used + orig_bytes <= space_info->total_bytes) { |
5279 | space_info->bytes_may_use += orig_bytes; | |
0b246afa JM |
5280 | trace_btrfs_space_reservation(fs_info, "space_info", |
5281 | space_info->flags, orig_bytes, 1); | |
957780eb | 5282 | ret = 0; |
c1c4919b JM |
5283 | } else if (can_overcommit(fs_info, space_info, orig_bytes, flush, |
5284 | system_chunk)) { | |
44734ed1 | 5285 | space_info->bytes_may_use += orig_bytes; |
0b246afa JM |
5286 | trace_btrfs_space_reservation(fs_info, "space_info", |
5287 | space_info->flags, orig_bytes, 1); | |
44734ed1 | 5288 | ret = 0; |
2bf64758 JB |
5289 | } |
5290 | ||
8bb8ab2e | 5291 | /* |
957780eb JB |
5292 | * If we couldn't make a reservation then setup our reservation ticket |
5293 | * and kick the async worker if it's not already running. | |
08e007d2 | 5294 | * |
957780eb JB |
5295 | * If we are a priority flusher then we just need to add our ticket to |
5296 | * the list and we will do our own flushing further down. | |
8bb8ab2e | 5297 | */ |
72bcd99d | 5298 | if (ret && flush != BTRFS_RESERVE_NO_FLUSH) { |
957780eb JB |
5299 | ticket.bytes = orig_bytes; |
5300 | ticket.error = 0; | |
5301 | init_waitqueue_head(&ticket.wait); | |
5302 | if (flush == BTRFS_RESERVE_FLUSH_ALL) { | |
5303 | list_add_tail(&ticket.list, &space_info->tickets); | |
5304 | if (!space_info->flush) { | |
5305 | space_info->flush = 1; | |
0b246afa | 5306 | trace_btrfs_trigger_flush(fs_info, |
f376df2b JB |
5307 | space_info->flags, |
5308 | orig_bytes, flush, | |
5309 | "enospc"); | |
957780eb | 5310 | queue_work(system_unbound_wq, |
c1c4919b | 5311 | &fs_info->async_reclaim_work); |
957780eb JB |
5312 | } |
5313 | } else { | |
5314 | list_add_tail(&ticket.list, | |
5315 | &space_info->priority_tickets); | |
5316 | } | |
21c7e756 MX |
5317 | } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
5318 | used += orig_bytes; | |
f6acfd50 JB |
5319 | /* |
5320 | * We will do the space reservation dance during log replay, | |
5321 | * which means we won't have fs_info->fs_root set, so don't do | |
5322 | * the async reclaim as we will panic. | |
5323 | */ | |
0b246afa | 5324 | if (!test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags) && |
c1c4919b JM |
5325 | need_do_async_reclaim(fs_info, space_info, |
5326 | used, system_chunk) && | |
0b246afa JM |
5327 | !work_busy(&fs_info->async_reclaim_work)) { |
5328 | trace_btrfs_trigger_flush(fs_info, space_info->flags, | |
5329 | orig_bytes, flush, "preempt"); | |
21c7e756 | 5330 | queue_work(system_unbound_wq, |
0b246afa | 5331 | &fs_info->async_reclaim_work); |
f376df2b | 5332 | } |
8bb8ab2e | 5333 | } |
f0486c68 | 5334 | spin_unlock(&space_info->lock); |
08e007d2 | 5335 | if (!ret || flush == BTRFS_RESERVE_NO_FLUSH) |
957780eb | 5336 | return ret; |
f0486c68 | 5337 | |
957780eb | 5338 | if (flush == BTRFS_RESERVE_FLUSH_ALL) |
0b246afa | 5339 | return wait_reserve_ticket(fs_info, space_info, &ticket, |
957780eb | 5340 | orig_bytes); |
08e007d2 | 5341 | |
957780eb | 5342 | ret = 0; |
0b246afa | 5343 | priority_reclaim_metadata_space(fs_info, space_info, &ticket); |
957780eb JB |
5344 | spin_lock(&space_info->lock); |
5345 | if (ticket.bytes) { | |
5346 | if (ticket.bytes < orig_bytes) { | |
5347 | u64 num_bytes = orig_bytes - ticket.bytes; | |
5348 | space_info->bytes_may_use -= num_bytes; | |
0b246afa JM |
5349 | trace_btrfs_space_reservation(fs_info, "space_info", |
5350 | space_info->flags, | |
5351 | num_bytes, 0); | |
08e007d2 | 5352 | |
957780eb JB |
5353 | } |
5354 | list_del_init(&ticket.list); | |
5355 | ret = -ENOSPC; | |
5356 | } | |
5357 | spin_unlock(&space_info->lock); | |
5358 | ASSERT(list_empty(&ticket.list)); | |
5359 | return ret; | |
5360 | } | |
8bb8ab2e | 5361 | |
957780eb JB |
5362 | /** |
5363 | * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space | |
5364 | * @root - the root we're allocating for | |
5365 | * @block_rsv - the block_rsv we're allocating for | |
5366 | * @orig_bytes - the number of bytes we want | |
5367 | * @flush - whether or not we can flush to make our reservation | |
5368 | * | |
5369 | * This will reserve orgi_bytes number of bytes from the space info associated | |
5370 | * with the block_rsv. If there is not enough space it will make an attempt to | |
5371 | * flush out space to make room. It will do this by flushing delalloc if | |
5372 | * possible or committing the transaction. If flush is 0 then no attempts to | |
5373 | * regain reservations will be made and this will fail if there is not enough | |
5374 | * space already. | |
5375 | */ | |
5376 | static int reserve_metadata_bytes(struct btrfs_root *root, | |
5377 | struct btrfs_block_rsv *block_rsv, | |
5378 | u64 orig_bytes, | |
5379 | enum btrfs_reserve_flush_enum flush) | |
5380 | { | |
0b246afa JM |
5381 | struct btrfs_fs_info *fs_info = root->fs_info; |
5382 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
957780eb | 5383 | int ret; |
c1c4919b | 5384 | bool system_chunk = (root == fs_info->chunk_root); |
957780eb | 5385 | |
c1c4919b JM |
5386 | ret = __reserve_metadata_bytes(fs_info, block_rsv->space_info, |
5387 | orig_bytes, flush, system_chunk); | |
5d80366e JB |
5388 | if (ret == -ENOSPC && |
5389 | unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) { | |
5d80366e JB |
5390 | if (block_rsv != global_rsv && |
5391 | !block_rsv_use_bytes(global_rsv, orig_bytes)) | |
5392 | ret = 0; | |
5393 | } | |
9a3daff3 | 5394 | if (ret == -ENOSPC) { |
0b246afa | 5395 | trace_btrfs_space_reservation(fs_info, "space_info:enospc", |
957780eb JB |
5396 | block_rsv->space_info->flags, |
5397 | orig_bytes, 1); | |
9a3daff3 NB |
5398 | |
5399 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) | |
5400 | dump_space_info(fs_info, block_rsv->space_info, | |
5401 | orig_bytes, 0); | |
5402 | } | |
f0486c68 YZ |
5403 | return ret; |
5404 | } | |
5405 | ||
79787eaa JM |
5406 | static struct btrfs_block_rsv *get_block_rsv( |
5407 | const struct btrfs_trans_handle *trans, | |
5408 | const struct btrfs_root *root) | |
f0486c68 | 5409 | { |
0b246afa | 5410 | struct btrfs_fs_info *fs_info = root->fs_info; |
4c13d758 JB |
5411 | struct btrfs_block_rsv *block_rsv = NULL; |
5412 | ||
e9cf439f | 5413 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
0b246afa JM |
5414 | (root == fs_info->csum_root && trans->adding_csums) || |
5415 | (root == fs_info->uuid_root)) | |
f7a81ea4 SB |
5416 | block_rsv = trans->block_rsv; |
5417 | ||
4c13d758 | 5418 | if (!block_rsv) |
f0486c68 YZ |
5419 | block_rsv = root->block_rsv; |
5420 | ||
5421 | if (!block_rsv) | |
0b246afa | 5422 | block_rsv = &fs_info->empty_block_rsv; |
f0486c68 YZ |
5423 | |
5424 | return block_rsv; | |
5425 | } | |
5426 | ||
5427 | static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, | |
5428 | u64 num_bytes) | |
5429 | { | |
5430 | int ret = -ENOSPC; | |
5431 | spin_lock(&block_rsv->lock); | |
5432 | if (block_rsv->reserved >= num_bytes) { | |
5433 | block_rsv->reserved -= num_bytes; | |
5434 | if (block_rsv->reserved < block_rsv->size) | |
5435 | block_rsv->full = 0; | |
5436 | ret = 0; | |
5437 | } | |
5438 | spin_unlock(&block_rsv->lock); | |
5439 | return ret; | |
5440 | } | |
5441 | ||
5442 | static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, | |
5443 | u64 num_bytes, int update_size) | |
5444 | { | |
5445 | spin_lock(&block_rsv->lock); | |
5446 | block_rsv->reserved += num_bytes; | |
5447 | if (update_size) | |
5448 | block_rsv->size += num_bytes; | |
5449 | else if (block_rsv->reserved >= block_rsv->size) | |
5450 | block_rsv->full = 1; | |
5451 | spin_unlock(&block_rsv->lock); | |
5452 | } | |
5453 | ||
d52be818 JB |
5454 | int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, |
5455 | struct btrfs_block_rsv *dest, u64 num_bytes, | |
5456 | int min_factor) | |
5457 | { | |
5458 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
5459 | u64 min_bytes; | |
5460 | ||
5461 | if (global_rsv->space_info != dest->space_info) | |
5462 | return -ENOSPC; | |
5463 | ||
5464 | spin_lock(&global_rsv->lock); | |
5465 | min_bytes = div_factor(global_rsv->size, min_factor); | |
5466 | if (global_rsv->reserved < min_bytes + num_bytes) { | |
5467 | spin_unlock(&global_rsv->lock); | |
5468 | return -ENOSPC; | |
5469 | } | |
5470 | global_rsv->reserved -= num_bytes; | |
5471 | if (global_rsv->reserved < global_rsv->size) | |
5472 | global_rsv->full = 0; | |
5473 | spin_unlock(&global_rsv->lock); | |
5474 | ||
5475 | block_rsv_add_bytes(dest, num_bytes, 1); | |
5476 | return 0; | |
5477 | } | |
5478 | ||
957780eb JB |
5479 | /* |
5480 | * This is for space we already have accounted in space_info->bytes_may_use, so | |
5481 | * basically when we're returning space from block_rsv's. | |
5482 | */ | |
5483 | static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info, | |
5484 | struct btrfs_space_info *space_info, | |
5485 | u64 num_bytes) | |
5486 | { | |
5487 | struct reserve_ticket *ticket; | |
5488 | struct list_head *head; | |
5489 | u64 used; | |
5490 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_NO_FLUSH; | |
5491 | bool check_overcommit = false; | |
5492 | ||
5493 | spin_lock(&space_info->lock); | |
5494 | head = &space_info->priority_tickets; | |
5495 | ||
5496 | /* | |
5497 | * If we are over our limit then we need to check and see if we can | |
5498 | * overcommit, and if we can't then we just need to free up our space | |
5499 | * and not satisfy any requests. | |
5500 | */ | |
0eee8a49 | 5501 | used = btrfs_space_info_used(space_info, true); |
957780eb JB |
5502 | if (used - num_bytes >= space_info->total_bytes) |
5503 | check_overcommit = true; | |
5504 | again: | |
5505 | while (!list_empty(head) && num_bytes) { | |
5506 | ticket = list_first_entry(head, struct reserve_ticket, | |
5507 | list); | |
5508 | /* | |
5509 | * We use 0 bytes because this space is already reserved, so | |
5510 | * adding the ticket space would be a double count. | |
5511 | */ | |
5512 | if (check_overcommit && | |
c1c4919b | 5513 | !can_overcommit(fs_info, space_info, 0, flush, false)) |
957780eb JB |
5514 | break; |
5515 | if (num_bytes >= ticket->bytes) { | |
5516 | list_del_init(&ticket->list); | |
5517 | num_bytes -= ticket->bytes; | |
5518 | ticket->bytes = 0; | |
ce129655 | 5519 | space_info->tickets_id++; |
957780eb JB |
5520 | wake_up(&ticket->wait); |
5521 | } else { | |
5522 | ticket->bytes -= num_bytes; | |
5523 | num_bytes = 0; | |
5524 | } | |
5525 | } | |
5526 | ||
5527 | if (num_bytes && head == &space_info->priority_tickets) { | |
5528 | head = &space_info->tickets; | |
5529 | flush = BTRFS_RESERVE_FLUSH_ALL; | |
5530 | goto again; | |
5531 | } | |
5532 | space_info->bytes_may_use -= num_bytes; | |
5533 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5534 | space_info->flags, num_bytes, 0); | |
5535 | spin_unlock(&space_info->lock); | |
5536 | } | |
5537 | ||
5538 | /* | |
5539 | * This is for newly allocated space that isn't accounted in | |
5540 | * space_info->bytes_may_use yet. So if we allocate a chunk or unpin an extent | |
5541 | * we use this helper. | |
5542 | */ | |
5543 | static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, | |
5544 | struct btrfs_space_info *space_info, | |
5545 | u64 num_bytes) | |
5546 | { | |
5547 | struct reserve_ticket *ticket; | |
5548 | struct list_head *head = &space_info->priority_tickets; | |
5549 | ||
5550 | again: | |
5551 | while (!list_empty(head) && num_bytes) { | |
5552 | ticket = list_first_entry(head, struct reserve_ticket, | |
5553 | list); | |
5554 | if (num_bytes >= ticket->bytes) { | |
5555 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5556 | space_info->flags, | |
5557 | ticket->bytes, 1); | |
5558 | list_del_init(&ticket->list); | |
5559 | num_bytes -= ticket->bytes; | |
5560 | space_info->bytes_may_use += ticket->bytes; | |
5561 | ticket->bytes = 0; | |
ce129655 | 5562 | space_info->tickets_id++; |
957780eb JB |
5563 | wake_up(&ticket->wait); |
5564 | } else { | |
5565 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5566 | space_info->flags, | |
5567 | num_bytes, 1); | |
5568 | space_info->bytes_may_use += num_bytes; | |
5569 | ticket->bytes -= num_bytes; | |
5570 | num_bytes = 0; | |
5571 | } | |
5572 | } | |
5573 | ||
5574 | if (num_bytes && head == &space_info->priority_tickets) { | |
5575 | head = &space_info->tickets; | |
5576 | goto again; | |
5577 | } | |
5578 | } | |
5579 | ||
69fe2d75 | 5580 | static u64 block_rsv_release_bytes(struct btrfs_fs_info *fs_info, |
8c2a3ca2 | 5581 | struct btrfs_block_rsv *block_rsv, |
ff6bc37e QW |
5582 | struct btrfs_block_rsv *dest, u64 num_bytes, |
5583 | u64 *qgroup_to_release_ret) | |
f0486c68 YZ |
5584 | { |
5585 | struct btrfs_space_info *space_info = block_rsv->space_info; | |
ff6bc37e | 5586 | u64 qgroup_to_release = 0; |
69fe2d75 | 5587 | u64 ret; |
f0486c68 YZ |
5588 | |
5589 | spin_lock(&block_rsv->lock); | |
ff6bc37e | 5590 | if (num_bytes == (u64)-1) { |
f0486c68 | 5591 | num_bytes = block_rsv->size; |
ff6bc37e QW |
5592 | qgroup_to_release = block_rsv->qgroup_rsv_size; |
5593 | } | |
f0486c68 YZ |
5594 | block_rsv->size -= num_bytes; |
5595 | if (block_rsv->reserved >= block_rsv->size) { | |
5596 | num_bytes = block_rsv->reserved - block_rsv->size; | |
5597 | block_rsv->reserved = block_rsv->size; | |
5598 | block_rsv->full = 1; | |
5599 | } else { | |
5600 | num_bytes = 0; | |
5601 | } | |
ff6bc37e QW |
5602 | if (block_rsv->qgroup_rsv_reserved >= block_rsv->qgroup_rsv_size) { |
5603 | qgroup_to_release = block_rsv->qgroup_rsv_reserved - | |
5604 | block_rsv->qgroup_rsv_size; | |
5605 | block_rsv->qgroup_rsv_reserved = block_rsv->qgroup_rsv_size; | |
5606 | } else { | |
5607 | qgroup_to_release = 0; | |
5608 | } | |
f0486c68 YZ |
5609 | spin_unlock(&block_rsv->lock); |
5610 | ||
69fe2d75 | 5611 | ret = num_bytes; |
f0486c68 YZ |
5612 | if (num_bytes > 0) { |
5613 | if (dest) { | |
e9e22899 JB |
5614 | spin_lock(&dest->lock); |
5615 | if (!dest->full) { | |
5616 | u64 bytes_to_add; | |
5617 | ||
5618 | bytes_to_add = dest->size - dest->reserved; | |
5619 | bytes_to_add = min(num_bytes, bytes_to_add); | |
5620 | dest->reserved += bytes_to_add; | |
5621 | if (dest->reserved >= dest->size) | |
5622 | dest->full = 1; | |
5623 | num_bytes -= bytes_to_add; | |
5624 | } | |
5625 | spin_unlock(&dest->lock); | |
5626 | } | |
957780eb JB |
5627 | if (num_bytes) |
5628 | space_info_add_old_bytes(fs_info, space_info, | |
5629 | num_bytes); | |
9ed74f2d | 5630 | } |
ff6bc37e QW |
5631 | if (qgroup_to_release_ret) |
5632 | *qgroup_to_release_ret = qgroup_to_release; | |
69fe2d75 | 5633 | return ret; |
f0486c68 | 5634 | } |
4e06bdd6 | 5635 | |
25d609f8 JB |
5636 | int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src, |
5637 | struct btrfs_block_rsv *dst, u64 num_bytes, | |
5638 | int update_size) | |
f0486c68 YZ |
5639 | { |
5640 | int ret; | |
9ed74f2d | 5641 | |
f0486c68 YZ |
5642 | ret = block_rsv_use_bytes(src, num_bytes); |
5643 | if (ret) | |
5644 | return ret; | |
9ed74f2d | 5645 | |
25d609f8 | 5646 | block_rsv_add_bytes(dst, num_bytes, update_size); |
9ed74f2d JB |
5647 | return 0; |
5648 | } | |
5649 | ||
66d8f3dd | 5650 | void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type) |
9ed74f2d | 5651 | { |
f0486c68 YZ |
5652 | memset(rsv, 0, sizeof(*rsv)); |
5653 | spin_lock_init(&rsv->lock); | |
66d8f3dd | 5654 | rsv->type = type; |
f0486c68 YZ |
5655 | } |
5656 | ||
69fe2d75 JB |
5657 | void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info, |
5658 | struct btrfs_block_rsv *rsv, | |
5659 | unsigned short type) | |
5660 | { | |
5661 | btrfs_init_block_rsv(rsv, type); | |
5662 | rsv->space_info = __find_space_info(fs_info, | |
5663 | BTRFS_BLOCK_GROUP_METADATA); | |
5664 | } | |
5665 | ||
2ff7e61e | 5666 | struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info, |
66d8f3dd | 5667 | unsigned short type) |
f0486c68 YZ |
5668 | { |
5669 | struct btrfs_block_rsv *block_rsv; | |
9ed74f2d | 5670 | |
f0486c68 YZ |
5671 | block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); |
5672 | if (!block_rsv) | |
5673 | return NULL; | |
9ed74f2d | 5674 | |
69fe2d75 | 5675 | btrfs_init_metadata_block_rsv(fs_info, block_rsv, type); |
f0486c68 YZ |
5676 | return block_rsv; |
5677 | } | |
9ed74f2d | 5678 | |
2ff7e61e | 5679 | void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
5680 | struct btrfs_block_rsv *rsv) |
5681 | { | |
2aaa6655 JB |
5682 | if (!rsv) |
5683 | return; | |
2ff7e61e | 5684 | btrfs_block_rsv_release(fs_info, rsv, (u64)-1); |
dabdb640 | 5685 | kfree(rsv); |
9ed74f2d JB |
5686 | } |
5687 | ||
cdfb080e CM |
5688 | void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv) |
5689 | { | |
5690 | kfree(rsv); | |
5691 | } | |
5692 | ||
08e007d2 MX |
5693 | int btrfs_block_rsv_add(struct btrfs_root *root, |
5694 | struct btrfs_block_rsv *block_rsv, u64 num_bytes, | |
5695 | enum btrfs_reserve_flush_enum flush) | |
9ed74f2d | 5696 | { |
f0486c68 | 5697 | int ret; |
9ed74f2d | 5698 | |
f0486c68 YZ |
5699 | if (num_bytes == 0) |
5700 | return 0; | |
8bb8ab2e | 5701 | |
61b520a9 | 5702 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
f0486c68 YZ |
5703 | if (!ret) { |
5704 | block_rsv_add_bytes(block_rsv, num_bytes, 1); | |
5705 | return 0; | |
5706 | } | |
9ed74f2d | 5707 | |
f0486c68 | 5708 | return ret; |
f0486c68 | 5709 | } |
9ed74f2d | 5710 | |
2ff7e61e | 5711 | int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor) |
f0486c68 YZ |
5712 | { |
5713 | u64 num_bytes = 0; | |
f0486c68 | 5714 | int ret = -ENOSPC; |
9ed74f2d | 5715 | |
f0486c68 YZ |
5716 | if (!block_rsv) |
5717 | return 0; | |
9ed74f2d | 5718 | |
f0486c68 | 5719 | spin_lock(&block_rsv->lock); |
36ba022a JB |
5720 | num_bytes = div_factor(block_rsv->size, min_factor); |
5721 | if (block_rsv->reserved >= num_bytes) | |
5722 | ret = 0; | |
5723 | spin_unlock(&block_rsv->lock); | |
9ed74f2d | 5724 | |
36ba022a JB |
5725 | return ret; |
5726 | } | |
5727 | ||
08e007d2 MX |
5728 | int btrfs_block_rsv_refill(struct btrfs_root *root, |
5729 | struct btrfs_block_rsv *block_rsv, u64 min_reserved, | |
5730 | enum btrfs_reserve_flush_enum flush) | |
36ba022a JB |
5731 | { |
5732 | u64 num_bytes = 0; | |
5733 | int ret = -ENOSPC; | |
5734 | ||
5735 | if (!block_rsv) | |
5736 | return 0; | |
5737 | ||
5738 | spin_lock(&block_rsv->lock); | |
5739 | num_bytes = min_reserved; | |
13553e52 | 5740 | if (block_rsv->reserved >= num_bytes) |
f0486c68 | 5741 | ret = 0; |
13553e52 | 5742 | else |
f0486c68 | 5743 | num_bytes -= block_rsv->reserved; |
f0486c68 | 5744 | spin_unlock(&block_rsv->lock); |
13553e52 | 5745 | |
f0486c68 YZ |
5746 | if (!ret) |
5747 | return 0; | |
5748 | ||
aa38a711 | 5749 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
dabdb640 JB |
5750 | if (!ret) { |
5751 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
f0486c68 | 5752 | return 0; |
6a63209f | 5753 | } |
9ed74f2d | 5754 | |
13553e52 | 5755 | return ret; |
f0486c68 YZ |
5756 | } |
5757 | ||
69fe2d75 JB |
5758 | /** |
5759 | * btrfs_inode_rsv_refill - refill the inode block rsv. | |
5760 | * @inode - the inode we are refilling. | |
5761 | * @flush - the flusing restriction. | |
5762 | * | |
5763 | * Essentially the same as btrfs_block_rsv_refill, except it uses the | |
5764 | * block_rsv->size as the minimum size. We'll either refill the missing amount | |
5765 | * or return if we already have enough space. This will also handle the resreve | |
5766 | * tracepoint for the reserved amount. | |
5767 | */ | |
3f2dd7a0 QW |
5768 | static int btrfs_inode_rsv_refill(struct btrfs_inode *inode, |
5769 | enum btrfs_reserve_flush_enum flush) | |
69fe2d75 JB |
5770 | { |
5771 | struct btrfs_root *root = inode->root; | |
5772 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; | |
5773 | u64 num_bytes = 0; | |
ff6bc37e | 5774 | u64 qgroup_num_bytes = 0; |
69fe2d75 JB |
5775 | int ret = -ENOSPC; |
5776 | ||
5777 | spin_lock(&block_rsv->lock); | |
5778 | if (block_rsv->reserved < block_rsv->size) | |
5779 | num_bytes = block_rsv->size - block_rsv->reserved; | |
ff6bc37e QW |
5780 | if (block_rsv->qgroup_rsv_reserved < block_rsv->qgroup_rsv_size) |
5781 | qgroup_num_bytes = block_rsv->qgroup_rsv_size - | |
5782 | block_rsv->qgroup_rsv_reserved; | |
69fe2d75 JB |
5783 | spin_unlock(&block_rsv->lock); |
5784 | ||
5785 | if (num_bytes == 0) | |
5786 | return 0; | |
5787 | ||
ff6bc37e | 5788 | ret = btrfs_qgroup_reserve_meta_prealloc(root, qgroup_num_bytes, true); |
43b18595 QW |
5789 | if (ret) |
5790 | return ret; | |
69fe2d75 JB |
5791 | ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush); |
5792 | if (!ret) { | |
5793 | block_rsv_add_bytes(block_rsv, num_bytes, 0); | |
5794 | trace_btrfs_space_reservation(root->fs_info, "delalloc", | |
5795 | btrfs_ino(inode), num_bytes, 1); | |
ff6bc37e QW |
5796 | |
5797 | /* Don't forget to increase qgroup_rsv_reserved */ | |
5798 | spin_lock(&block_rsv->lock); | |
5799 | block_rsv->qgroup_rsv_reserved += qgroup_num_bytes; | |
5800 | spin_unlock(&block_rsv->lock); | |
5801 | } else | |
5802 | btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes); | |
69fe2d75 JB |
5803 | return ret; |
5804 | } | |
5805 | ||
5806 | /** | |
5807 | * btrfs_inode_rsv_release - release any excessive reservation. | |
5808 | * @inode - the inode we need to release from. | |
43b18595 QW |
5809 | * @qgroup_free - free or convert qgroup meta. |
5810 | * Unlike normal operation, qgroup meta reservation needs to know if we are | |
5811 | * freeing qgroup reservation or just converting it into per-trans. Normally | |
5812 | * @qgroup_free is true for error handling, and false for normal release. | |
69fe2d75 JB |
5813 | * |
5814 | * This is the same as btrfs_block_rsv_release, except that it handles the | |
5815 | * tracepoint for the reservation. | |
5816 | */ | |
43b18595 | 5817 | static void btrfs_inode_rsv_release(struct btrfs_inode *inode, bool qgroup_free) |
69fe2d75 JB |
5818 | { |
5819 | struct btrfs_fs_info *fs_info = inode->root->fs_info; | |
5820 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
5821 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; | |
5822 | u64 released = 0; | |
ff6bc37e | 5823 | u64 qgroup_to_release = 0; |
69fe2d75 JB |
5824 | |
5825 | /* | |
5826 | * Since we statically set the block_rsv->size we just want to say we | |
5827 | * are releasing 0 bytes, and then we'll just get the reservation over | |
5828 | * the size free'd. | |
5829 | */ | |
ff6bc37e QW |
5830 | released = block_rsv_release_bytes(fs_info, block_rsv, global_rsv, 0, |
5831 | &qgroup_to_release); | |
69fe2d75 JB |
5832 | if (released > 0) |
5833 | trace_btrfs_space_reservation(fs_info, "delalloc", | |
5834 | btrfs_ino(inode), released, 0); | |
43b18595 | 5835 | if (qgroup_free) |
ff6bc37e | 5836 | btrfs_qgroup_free_meta_prealloc(inode->root, qgroup_to_release); |
43b18595 | 5837 | else |
ff6bc37e QW |
5838 | btrfs_qgroup_convert_reserved_meta(inode->root, |
5839 | qgroup_to_release); | |
69fe2d75 JB |
5840 | } |
5841 | ||
2ff7e61e | 5842 | void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
5843 | struct btrfs_block_rsv *block_rsv, |
5844 | u64 num_bytes) | |
5845 | { | |
0b246afa JM |
5846 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
5847 | ||
17504584 | 5848 | if (global_rsv == block_rsv || |
f0486c68 YZ |
5849 | block_rsv->space_info != global_rsv->space_info) |
5850 | global_rsv = NULL; | |
ff6bc37e | 5851 | block_rsv_release_bytes(fs_info, block_rsv, global_rsv, num_bytes, NULL); |
6a63209f JB |
5852 | } |
5853 | ||
8929ecfa YZ |
5854 | static void update_global_block_rsv(struct btrfs_fs_info *fs_info) |
5855 | { | |
5856 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
5857 | struct btrfs_space_info *sinfo = block_rsv->space_info; | |
5858 | u64 num_bytes; | |
6a63209f | 5859 | |
ae2e4728 JB |
5860 | /* |
5861 | * The global block rsv is based on the size of the extent tree, the | |
5862 | * checksum tree and the root tree. If the fs is empty we want to set | |
5863 | * it to a minimal amount for safety. | |
5864 | */ | |
5865 | num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) + | |
5866 | btrfs_root_used(&fs_info->csum_root->root_item) + | |
5867 | btrfs_root_used(&fs_info->tree_root->root_item); | |
5868 | num_bytes = max_t(u64, num_bytes, SZ_16M); | |
33b4d47f | 5869 | |
8929ecfa | 5870 | spin_lock(&sinfo->lock); |
1f699d38 | 5871 | spin_lock(&block_rsv->lock); |
4e06bdd6 | 5872 | |
ee22184b | 5873 | block_rsv->size = min_t(u64, num_bytes, SZ_512M); |
4e06bdd6 | 5874 | |
fb4b10e5 | 5875 | if (block_rsv->reserved < block_rsv->size) { |
4136135b | 5876 | num_bytes = btrfs_space_info_used(sinfo, true); |
fb4b10e5 JB |
5877 | if (sinfo->total_bytes > num_bytes) { |
5878 | num_bytes = sinfo->total_bytes - num_bytes; | |
5879 | num_bytes = min(num_bytes, | |
5880 | block_rsv->size - block_rsv->reserved); | |
5881 | block_rsv->reserved += num_bytes; | |
5882 | sinfo->bytes_may_use += num_bytes; | |
5883 | trace_btrfs_space_reservation(fs_info, "space_info", | |
5884 | sinfo->flags, num_bytes, | |
5885 | 1); | |
5886 | } | |
5887 | } else if (block_rsv->reserved > block_rsv->size) { | |
8929ecfa | 5888 | num_bytes = block_rsv->reserved - block_rsv->size; |
fb25e914 | 5889 | sinfo->bytes_may_use -= num_bytes; |
8c2a3ca2 | 5890 | trace_btrfs_space_reservation(fs_info, "space_info", |
2bcc0328 | 5891 | sinfo->flags, num_bytes, 0); |
8929ecfa | 5892 | block_rsv->reserved = block_rsv->size; |
8929ecfa | 5893 | } |
182608c8 | 5894 | |
fb4b10e5 JB |
5895 | if (block_rsv->reserved == block_rsv->size) |
5896 | block_rsv->full = 1; | |
5897 | else | |
5898 | block_rsv->full = 0; | |
5899 | ||
8929ecfa | 5900 | spin_unlock(&block_rsv->lock); |
1f699d38 | 5901 | spin_unlock(&sinfo->lock); |
6a63209f JB |
5902 | } |
5903 | ||
f0486c68 | 5904 | static void init_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5905 | { |
f0486c68 | 5906 | struct btrfs_space_info *space_info; |
6a63209f | 5907 | |
f0486c68 YZ |
5908 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); |
5909 | fs_info->chunk_block_rsv.space_info = space_info; | |
6a63209f | 5910 | |
f0486c68 | 5911 | space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); |
8929ecfa | 5912 | fs_info->global_block_rsv.space_info = space_info; |
f0486c68 YZ |
5913 | fs_info->trans_block_rsv.space_info = space_info; |
5914 | fs_info->empty_block_rsv.space_info = space_info; | |
6d668dda | 5915 | fs_info->delayed_block_rsv.space_info = space_info; |
f0486c68 | 5916 | |
8929ecfa YZ |
5917 | fs_info->extent_root->block_rsv = &fs_info->global_block_rsv; |
5918 | fs_info->csum_root->block_rsv = &fs_info->global_block_rsv; | |
5919 | fs_info->dev_root->block_rsv = &fs_info->global_block_rsv; | |
5920 | fs_info->tree_root->block_rsv = &fs_info->global_block_rsv; | |
3a6cad90 SB |
5921 | if (fs_info->quota_root) |
5922 | fs_info->quota_root->block_rsv = &fs_info->global_block_rsv; | |
f0486c68 | 5923 | fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; |
8929ecfa | 5924 | |
8929ecfa | 5925 | update_global_block_rsv(fs_info); |
6a63209f JB |
5926 | } |
5927 | ||
8929ecfa | 5928 | static void release_global_block_rsv(struct btrfs_fs_info *fs_info) |
6a63209f | 5929 | { |
8c2a3ca2 | 5930 | block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL, |
ff6bc37e | 5931 | (u64)-1, NULL); |
8929ecfa YZ |
5932 | WARN_ON(fs_info->trans_block_rsv.size > 0); |
5933 | WARN_ON(fs_info->trans_block_rsv.reserved > 0); | |
5934 | WARN_ON(fs_info->chunk_block_rsv.size > 0); | |
5935 | WARN_ON(fs_info->chunk_block_rsv.reserved > 0); | |
6d668dda JB |
5936 | WARN_ON(fs_info->delayed_block_rsv.size > 0); |
5937 | WARN_ON(fs_info->delayed_block_rsv.reserved > 0); | |
fcb80c2a JB |
5938 | } |
5939 | ||
6a63209f | 5940 | |
4fbcdf66 FM |
5941 | /* |
5942 | * To be called after all the new block groups attached to the transaction | |
5943 | * handle have been created (btrfs_create_pending_block_groups()). | |
5944 | */ | |
5945 | void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans) | |
5946 | { | |
64b63580 | 5947 | struct btrfs_fs_info *fs_info = trans->fs_info; |
4fbcdf66 FM |
5948 | |
5949 | if (!trans->chunk_bytes_reserved) | |
5950 | return; | |
5951 | ||
5952 | WARN_ON_ONCE(!list_empty(&trans->new_bgs)); | |
5953 | ||
5954 | block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL, | |
ff6bc37e | 5955 | trans->chunk_bytes_reserved, NULL); |
4fbcdf66 FM |
5956 | trans->chunk_bytes_reserved = 0; |
5957 | } | |
5958 | ||
d5c12070 MX |
5959 | /* |
5960 | * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation | |
5961 | * root: the root of the parent directory | |
5962 | * rsv: block reservation | |
5963 | * items: the number of items that we need do reservation | |
5964 | * qgroup_reserved: used to return the reserved size in qgroup | |
5965 | * | |
5966 | * This function is used to reserve the space for snapshot/subvolume | |
5967 | * creation and deletion. Those operations are different with the | |
5968 | * common file/directory operations, they change two fs/file trees | |
5969 | * and root tree, the number of items that the qgroup reserves is | |
5970 | * different with the free space reservation. So we can not use | |
01327610 | 5971 | * the space reservation mechanism in start_transaction(). |
d5c12070 MX |
5972 | */ |
5973 | int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, | |
5974 | struct btrfs_block_rsv *rsv, | |
5975 | int items, | |
ee3441b4 | 5976 | bool use_global_rsv) |
a22285a6 | 5977 | { |
d5c12070 MX |
5978 | u64 num_bytes; |
5979 | int ret; | |
0b246afa JM |
5980 | struct btrfs_fs_info *fs_info = root->fs_info; |
5981 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
d5c12070 | 5982 | |
0b246afa | 5983 | if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) { |
d5c12070 | 5984 | /* One for parent inode, two for dir entries */ |
0b246afa | 5985 | num_bytes = 3 * fs_info->nodesize; |
733e03a0 | 5986 | ret = btrfs_qgroup_reserve_meta_prealloc(root, num_bytes, true); |
d5c12070 MX |
5987 | if (ret) |
5988 | return ret; | |
5989 | } else { | |
5990 | num_bytes = 0; | |
5991 | } | |
5992 | ||
0b246afa JM |
5993 | num_bytes = btrfs_calc_trans_metadata_size(fs_info, items); |
5994 | rsv->space_info = __find_space_info(fs_info, | |
d5c12070 MX |
5995 | BTRFS_BLOCK_GROUP_METADATA); |
5996 | ret = btrfs_block_rsv_add(root, rsv, num_bytes, | |
5997 | BTRFS_RESERVE_FLUSH_ALL); | |
ee3441b4 JM |
5998 | |
5999 | if (ret == -ENOSPC && use_global_rsv) | |
25d609f8 | 6000 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, 1); |
ee3441b4 | 6001 | |
c4c129db GJ |
6002 | if (ret && num_bytes) |
6003 | btrfs_qgroup_free_meta_prealloc(root, num_bytes); | |
d5c12070 MX |
6004 | |
6005 | return ret; | |
6006 | } | |
6007 | ||
2ff7e61e | 6008 | void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info, |
7775c818 | 6009 | struct btrfs_block_rsv *rsv) |
d5c12070 | 6010 | { |
2ff7e61e | 6011 | btrfs_block_rsv_release(fs_info, rsv, (u64)-1); |
97e728d4 JB |
6012 | } |
6013 | ||
69fe2d75 JB |
6014 | static void btrfs_calculate_inode_block_rsv_size(struct btrfs_fs_info *fs_info, |
6015 | struct btrfs_inode *inode) | |
9e0baf60 | 6016 | { |
69fe2d75 JB |
6017 | struct btrfs_block_rsv *block_rsv = &inode->block_rsv; |
6018 | u64 reserve_size = 0; | |
ff6bc37e | 6019 | u64 qgroup_rsv_size = 0; |
69fe2d75 JB |
6020 | u64 csum_leaves; |
6021 | unsigned outstanding_extents; | |
9e0baf60 | 6022 | |
69fe2d75 JB |
6023 | lockdep_assert_held(&inode->lock); |
6024 | outstanding_extents = inode->outstanding_extents; | |
6025 | if (outstanding_extents) | |
6026 | reserve_size = btrfs_calc_trans_metadata_size(fs_info, | |
6027 | outstanding_extents + 1); | |
6028 | csum_leaves = btrfs_csum_bytes_to_leaves(fs_info, | |
6029 | inode->csum_bytes); | |
6030 | reserve_size += btrfs_calc_trans_metadata_size(fs_info, | |
6031 | csum_leaves); | |
ff6bc37e QW |
6032 | /* |
6033 | * For qgroup rsv, the calculation is very simple: | |
6034 | * account one nodesize for each outstanding extent | |
6035 | * | |
6036 | * This is overestimating in most cases. | |
6037 | */ | |
6038 | qgroup_rsv_size = outstanding_extents * fs_info->nodesize; | |
9e0baf60 | 6039 | |
69fe2d75 JB |
6040 | spin_lock(&block_rsv->lock); |
6041 | block_rsv->size = reserve_size; | |
ff6bc37e | 6042 | block_rsv->qgroup_rsv_size = qgroup_rsv_size; |
69fe2d75 | 6043 | spin_unlock(&block_rsv->lock); |
0ca1f7ce | 6044 | } |
c146afad | 6045 | |
9f3db423 | 6046 | int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes) |
0ca1f7ce | 6047 | { |
9f3db423 | 6048 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
69fe2d75 | 6049 | unsigned nr_extents; |
08e007d2 | 6050 | enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; |
eb6b88d9 | 6051 | int ret = 0; |
c64c2bd8 | 6052 | bool delalloc_lock = true; |
6324fbf3 | 6053 | |
c64c2bd8 JB |
6054 | /* If we are a free space inode we need to not flush since we will be in |
6055 | * the middle of a transaction commit. We also don't need the delalloc | |
6056 | * mutex since we won't race with anybody. We need this mostly to make | |
6057 | * lockdep shut its filthy mouth. | |
bac357dc JB |
6058 | * |
6059 | * If we have a transaction open (can happen if we call truncate_block | |
6060 | * from truncate), then we need FLUSH_LIMIT so we don't deadlock. | |
c64c2bd8 JB |
6061 | */ |
6062 | if (btrfs_is_free_space_inode(inode)) { | |
08e007d2 | 6063 | flush = BTRFS_RESERVE_NO_FLUSH; |
c64c2bd8 | 6064 | delalloc_lock = false; |
da07d4ab NB |
6065 | } else { |
6066 | if (current->journal_info) | |
6067 | flush = BTRFS_RESERVE_FLUSH_LIMIT; | |
c09544e0 | 6068 | |
da07d4ab NB |
6069 | if (btrfs_transaction_in_commit(fs_info)) |
6070 | schedule_timeout(1); | |
6071 | } | |
ec44a35c | 6072 | |
c64c2bd8 | 6073 | if (delalloc_lock) |
9f3db423 | 6074 | mutex_lock(&inode->delalloc_mutex); |
c64c2bd8 | 6075 | |
0b246afa | 6076 | num_bytes = ALIGN(num_bytes, fs_info->sectorsize); |
69fe2d75 JB |
6077 | |
6078 | /* Add our new extents and calculate the new rsv size. */ | |
9f3db423 | 6079 | spin_lock(&inode->lock); |
69fe2d75 | 6080 | nr_extents = count_max_extents(num_bytes); |
8b62f87b | 6081 | btrfs_mod_outstanding_extents(inode, nr_extents); |
69fe2d75 JB |
6082 | inode->csum_bytes += num_bytes; |
6083 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
9f3db423 | 6084 | spin_unlock(&inode->lock); |
57a45ced | 6085 | |
69fe2d75 | 6086 | ret = btrfs_inode_rsv_refill(inode, flush); |
43b18595 | 6087 | if (unlikely(ret)) |
88e081bf | 6088 | goto out_fail; |
25179201 | 6089 | |
c64c2bd8 | 6090 | if (delalloc_lock) |
9f3db423 | 6091 | mutex_unlock(&inode->delalloc_mutex); |
0ca1f7ce | 6092 | return 0; |
88e081bf WS |
6093 | |
6094 | out_fail: | |
9f3db423 | 6095 | spin_lock(&inode->lock); |
8b62f87b JB |
6096 | nr_extents = count_max_extents(num_bytes); |
6097 | btrfs_mod_outstanding_extents(inode, -nr_extents); | |
69fe2d75 JB |
6098 | inode->csum_bytes -= num_bytes; |
6099 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
9f3db423 | 6100 | spin_unlock(&inode->lock); |
88e081bf | 6101 | |
43b18595 | 6102 | btrfs_inode_rsv_release(inode, true); |
88e081bf | 6103 | if (delalloc_lock) |
9f3db423 | 6104 | mutex_unlock(&inode->delalloc_mutex); |
88e081bf | 6105 | return ret; |
0ca1f7ce YZ |
6106 | } |
6107 | ||
7709cde3 JB |
6108 | /** |
6109 | * btrfs_delalloc_release_metadata - release a metadata reservation for an inode | |
8b62f87b JB |
6110 | * @inode: the inode to release the reservation for. |
6111 | * @num_bytes: the number of bytes we are releasing. | |
43b18595 | 6112 | * @qgroup_free: free qgroup reservation or convert it to per-trans reservation |
7709cde3 JB |
6113 | * |
6114 | * This will release the metadata reservation for an inode. This can be called | |
6115 | * once we complete IO for a given set of bytes to release their metadata | |
8b62f87b | 6116 | * reservations, or on error for the same reason. |
7709cde3 | 6117 | */ |
43b18595 QW |
6118 | void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes, |
6119 | bool qgroup_free) | |
0ca1f7ce | 6120 | { |
691fa059 | 6121 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
0ca1f7ce | 6122 | |
0b246afa | 6123 | num_bytes = ALIGN(num_bytes, fs_info->sectorsize); |
691fa059 | 6124 | spin_lock(&inode->lock); |
69fe2d75 JB |
6125 | inode->csum_bytes -= num_bytes; |
6126 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); | |
691fa059 | 6127 | spin_unlock(&inode->lock); |
0ca1f7ce | 6128 | |
0b246afa | 6129 | if (btrfs_is_testing(fs_info)) |
6a3891c5 JB |
6130 | return; |
6131 | ||
43b18595 | 6132 | btrfs_inode_rsv_release(inode, qgroup_free); |
0ca1f7ce YZ |
6133 | } |
6134 | ||
8b62f87b JB |
6135 | /** |
6136 | * btrfs_delalloc_release_extents - release our outstanding_extents | |
6137 | * @inode: the inode to balance the reservation for. | |
6138 | * @num_bytes: the number of bytes we originally reserved with | |
43b18595 | 6139 | * @qgroup_free: do we need to free qgroup meta reservation or convert them. |
8b62f87b JB |
6140 | * |
6141 | * When we reserve space we increase outstanding_extents for the extents we may | |
6142 | * add. Once we've set the range as delalloc or created our ordered extents we | |
6143 | * have outstanding_extents to track the real usage, so we use this to free our | |
6144 | * temporarily tracked outstanding_extents. This _must_ be used in conjunction | |
6145 | * with btrfs_delalloc_reserve_metadata. | |
6146 | */ | |
43b18595 QW |
6147 | void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes, |
6148 | bool qgroup_free) | |
8b62f87b JB |
6149 | { |
6150 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); | |
6151 | unsigned num_extents; | |
8b62f87b JB |
6152 | |
6153 | spin_lock(&inode->lock); | |
6154 | num_extents = count_max_extents(num_bytes); | |
6155 | btrfs_mod_outstanding_extents(inode, -num_extents); | |
69fe2d75 | 6156 | btrfs_calculate_inode_block_rsv_size(fs_info, inode); |
8b62f87b JB |
6157 | spin_unlock(&inode->lock); |
6158 | ||
8b62f87b JB |
6159 | if (btrfs_is_testing(fs_info)) |
6160 | return; | |
6161 | ||
43b18595 | 6162 | btrfs_inode_rsv_release(inode, qgroup_free); |
8b62f87b JB |
6163 | } |
6164 | ||
1ada3a62 | 6165 | /** |
7cf5b976 | 6166 | * btrfs_delalloc_reserve_space - reserve data and metadata space for |
1ada3a62 QW |
6167 | * delalloc |
6168 | * @inode: inode we're writing to | |
6169 | * @start: start range we are writing to | |
6170 | * @len: how long the range we are writing to | |
364ecf36 QW |
6171 | * @reserved: mandatory parameter, record actually reserved qgroup ranges of |
6172 | * current reservation. | |
1ada3a62 | 6173 | * |
1ada3a62 QW |
6174 | * This will do the following things |
6175 | * | |
6176 | * o reserve space in data space info for num bytes | |
6177 | * and reserve precious corresponding qgroup space | |
6178 | * (Done in check_data_free_space) | |
6179 | * | |
6180 | * o reserve space for metadata space, based on the number of outstanding | |
6181 | * extents and how much csums will be needed | |
6182 | * also reserve metadata space in a per root over-reserve method. | |
6183 | * o add to the inodes->delalloc_bytes | |
6184 | * o add it to the fs_info's delalloc inodes list. | |
6185 | * (Above 3 all done in delalloc_reserve_metadata) | |
6186 | * | |
6187 | * Return 0 for success | |
6188 | * Return <0 for error(-ENOSPC or -EQUOT) | |
6189 | */ | |
364ecf36 QW |
6190 | int btrfs_delalloc_reserve_space(struct inode *inode, |
6191 | struct extent_changeset **reserved, u64 start, u64 len) | |
1ada3a62 QW |
6192 | { |
6193 | int ret; | |
6194 | ||
364ecf36 | 6195 | ret = btrfs_check_data_free_space(inode, reserved, start, len); |
1ada3a62 QW |
6196 | if (ret < 0) |
6197 | return ret; | |
9f3db423 | 6198 | ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), len); |
1ada3a62 | 6199 | if (ret < 0) |
bc42bda2 | 6200 | btrfs_free_reserved_data_space(inode, *reserved, start, len); |
1ada3a62 QW |
6201 | return ret; |
6202 | } | |
6203 | ||
7709cde3 | 6204 | /** |
7cf5b976 | 6205 | * btrfs_delalloc_release_space - release data and metadata space for delalloc |
1ada3a62 QW |
6206 | * @inode: inode we're releasing space for |
6207 | * @start: start position of the space already reserved | |
6208 | * @len: the len of the space already reserved | |
8b62f87b | 6209 | * @release_bytes: the len of the space we consumed or didn't use |
1ada3a62 QW |
6210 | * |
6211 | * This function will release the metadata space that was not used and will | |
6212 | * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes | |
6213 | * list if there are no delalloc bytes left. | |
6214 | * Also it will handle the qgroup reserved space. | |
6215 | */ | |
bc42bda2 | 6216 | void btrfs_delalloc_release_space(struct inode *inode, |
8b62f87b | 6217 | struct extent_changeset *reserved, |
43b18595 | 6218 | u64 start, u64 len, bool qgroup_free) |
1ada3a62 | 6219 | { |
43b18595 | 6220 | btrfs_delalloc_release_metadata(BTRFS_I(inode), len, qgroup_free); |
bc42bda2 | 6221 | btrfs_free_reserved_data_space(inode, reserved, start, len); |
6324fbf3 CM |
6222 | } |
6223 | ||
ce93ec54 | 6224 | static int update_block_group(struct btrfs_trans_handle *trans, |
6202df69 | 6225 | struct btrfs_fs_info *info, u64 bytenr, |
ce93ec54 | 6226 | u64 num_bytes, int alloc) |
9078a3e1 | 6227 | { |
0af3d00b | 6228 | struct btrfs_block_group_cache *cache = NULL; |
db94535d | 6229 | u64 total = num_bytes; |
9078a3e1 | 6230 | u64 old_val; |
db94535d | 6231 | u64 byte_in_group; |
0af3d00b | 6232 | int factor; |
3e1ad54f | 6233 | |
5d4f98a2 | 6234 | /* block accounting for super block */ |
eb73c1b7 | 6235 | spin_lock(&info->delalloc_root_lock); |
6c41761f | 6236 | old_val = btrfs_super_bytes_used(info->super_copy); |
5d4f98a2 YZ |
6237 | if (alloc) |
6238 | old_val += num_bytes; | |
6239 | else | |
6240 | old_val -= num_bytes; | |
6c41761f | 6241 | btrfs_set_super_bytes_used(info->super_copy, old_val); |
eb73c1b7 | 6242 | spin_unlock(&info->delalloc_root_lock); |
5d4f98a2 | 6243 | |
d397712b | 6244 | while (total) { |
db94535d | 6245 | cache = btrfs_lookup_block_group(info, bytenr); |
f3465ca4 | 6246 | if (!cache) |
79787eaa | 6247 | return -ENOENT; |
b742bb82 YZ |
6248 | if (cache->flags & (BTRFS_BLOCK_GROUP_DUP | |
6249 | BTRFS_BLOCK_GROUP_RAID1 | | |
6250 | BTRFS_BLOCK_GROUP_RAID10)) | |
6251 | factor = 2; | |
6252 | else | |
6253 | factor = 1; | |
9d66e233 JB |
6254 | /* |
6255 | * If this block group has free space cache written out, we | |
6256 | * need to make sure to load it if we are removing space. This | |
6257 | * is because we need the unpinning stage to actually add the | |
6258 | * space back to the block group, otherwise we will leak space. | |
6259 | */ | |
6260 | if (!alloc && cache->cached == BTRFS_CACHE_NO) | |
f6373bf3 | 6261 | cache_block_group(cache, 1); |
0af3d00b | 6262 | |
db94535d CM |
6263 | byte_in_group = bytenr - cache->key.objectid; |
6264 | WARN_ON(byte_in_group > cache->key.offset); | |
9078a3e1 | 6265 | |
25179201 | 6266 | spin_lock(&cache->space_info->lock); |
c286ac48 | 6267 | spin_lock(&cache->lock); |
0af3d00b | 6268 | |
6202df69 | 6269 | if (btrfs_test_opt(info, SPACE_CACHE) && |
0af3d00b JB |
6270 | cache->disk_cache_state < BTRFS_DC_CLEAR) |
6271 | cache->disk_cache_state = BTRFS_DC_CLEAR; | |
6272 | ||
9078a3e1 | 6273 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 6274 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 6275 | if (alloc) { |
db94535d | 6276 | old_val += num_bytes; |
11833d66 YZ |
6277 | btrfs_set_block_group_used(&cache->item, old_val); |
6278 | cache->reserved -= num_bytes; | |
11833d66 | 6279 | cache->space_info->bytes_reserved -= num_bytes; |
b742bb82 YZ |
6280 | cache->space_info->bytes_used += num_bytes; |
6281 | cache->space_info->disk_used += num_bytes * factor; | |
c286ac48 | 6282 | spin_unlock(&cache->lock); |
25179201 | 6283 | spin_unlock(&cache->space_info->lock); |
cd1bc465 | 6284 | } else { |
db94535d | 6285 | old_val -= num_bytes; |
ae0ab003 FM |
6286 | btrfs_set_block_group_used(&cache->item, old_val); |
6287 | cache->pinned += num_bytes; | |
6288 | cache->space_info->bytes_pinned += num_bytes; | |
6289 | cache->space_info->bytes_used -= num_bytes; | |
6290 | cache->space_info->disk_used -= num_bytes * factor; | |
6291 | spin_unlock(&cache->lock); | |
6292 | spin_unlock(&cache->space_info->lock); | |
47ab2a6c | 6293 | |
0b246afa | 6294 | trace_btrfs_space_reservation(info, "pinned", |
c51e7bb1 JB |
6295 | cache->space_info->flags, |
6296 | num_bytes, 1); | |
d7eae340 OS |
6297 | percpu_counter_add(&cache->space_info->total_bytes_pinned, |
6298 | num_bytes); | |
ae0ab003 FM |
6299 | set_extent_dirty(info->pinned_extents, |
6300 | bytenr, bytenr + num_bytes - 1, | |
6301 | GFP_NOFS | __GFP_NOFAIL); | |
cd1bc465 | 6302 | } |
1bbc621e CM |
6303 | |
6304 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
6305 | if (list_empty(&cache->dirty_list)) { | |
6306 | list_add_tail(&cache->dirty_list, | |
6307 | &trans->transaction->dirty_bgs); | |
bece2e82 | 6308 | trans->transaction->num_dirty_bgs++; |
1bbc621e CM |
6309 | btrfs_get_block_group(cache); |
6310 | } | |
6311 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
6312 | ||
036a9348 FM |
6313 | /* |
6314 | * No longer have used bytes in this block group, queue it for | |
6315 | * deletion. We do this after adding the block group to the | |
6316 | * dirty list to avoid races between cleaner kthread and space | |
6317 | * cache writeout. | |
6318 | */ | |
6319 | if (!alloc && old_val == 0) { | |
6320 | spin_lock(&info->unused_bgs_lock); | |
6321 | if (list_empty(&cache->bg_list)) { | |
6322 | btrfs_get_block_group(cache); | |
4ed0a7a3 | 6323 | trace_btrfs_add_unused_block_group(cache); |
036a9348 FM |
6324 | list_add_tail(&cache->bg_list, |
6325 | &info->unused_bgs); | |
6326 | } | |
6327 | spin_unlock(&info->unused_bgs_lock); | |
6328 | } | |
6329 | ||
fa9c0d79 | 6330 | btrfs_put_block_group(cache); |
db94535d CM |
6331 | total -= num_bytes; |
6332 | bytenr += num_bytes; | |
9078a3e1 CM |
6333 | } |
6334 | return 0; | |
6335 | } | |
6324fbf3 | 6336 | |
2ff7e61e | 6337 | static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start) |
a061fc8d | 6338 | { |
0f9dd46c | 6339 | struct btrfs_block_group_cache *cache; |
d2fb3437 | 6340 | u64 bytenr; |
0f9dd46c | 6341 | |
0b246afa JM |
6342 | spin_lock(&fs_info->block_group_cache_lock); |
6343 | bytenr = fs_info->first_logical_byte; | |
6344 | spin_unlock(&fs_info->block_group_cache_lock); | |
a1897fdd LB |
6345 | |
6346 | if (bytenr < (u64)-1) | |
6347 | return bytenr; | |
6348 | ||
0b246afa | 6349 | cache = btrfs_lookup_first_block_group(fs_info, search_start); |
0f9dd46c | 6350 | if (!cache) |
a061fc8d | 6351 | return 0; |
0f9dd46c | 6352 | |
d2fb3437 | 6353 | bytenr = cache->key.objectid; |
fa9c0d79 | 6354 | btrfs_put_block_group(cache); |
d2fb3437 YZ |
6355 | |
6356 | return bytenr; | |
a061fc8d CM |
6357 | } |
6358 | ||
2ff7e61e | 6359 | static int pin_down_extent(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
6360 | struct btrfs_block_group_cache *cache, |
6361 | u64 bytenr, u64 num_bytes, int reserved) | |
324ae4df | 6362 | { |
11833d66 YZ |
6363 | spin_lock(&cache->space_info->lock); |
6364 | spin_lock(&cache->lock); | |
6365 | cache->pinned += num_bytes; | |
6366 | cache->space_info->bytes_pinned += num_bytes; | |
6367 | if (reserved) { | |
6368 | cache->reserved -= num_bytes; | |
6369 | cache->space_info->bytes_reserved -= num_bytes; | |
6370 | } | |
6371 | spin_unlock(&cache->lock); | |
6372 | spin_unlock(&cache->space_info->lock); | |
68b38550 | 6373 | |
0b246afa | 6374 | trace_btrfs_space_reservation(fs_info, "pinned", |
c51e7bb1 | 6375 | cache->space_info->flags, num_bytes, 1); |
4da8b76d | 6376 | percpu_counter_add(&cache->space_info->total_bytes_pinned, num_bytes); |
0b246afa | 6377 | set_extent_dirty(fs_info->pinned_extents, bytenr, |
f0486c68 YZ |
6378 | bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); |
6379 | return 0; | |
6380 | } | |
68b38550 | 6381 | |
f0486c68 YZ |
6382 | /* |
6383 | * this function must be called within transaction | |
6384 | */ | |
2ff7e61e | 6385 | int btrfs_pin_extent(struct btrfs_fs_info *fs_info, |
f0486c68 YZ |
6386 | u64 bytenr, u64 num_bytes, int reserved) |
6387 | { | |
6388 | struct btrfs_block_group_cache *cache; | |
68b38550 | 6389 | |
0b246afa | 6390 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
79787eaa | 6391 | BUG_ON(!cache); /* Logic error */ |
f0486c68 | 6392 | |
2ff7e61e | 6393 | pin_down_extent(fs_info, cache, bytenr, num_bytes, reserved); |
f0486c68 YZ |
6394 | |
6395 | btrfs_put_block_group(cache); | |
11833d66 YZ |
6396 | return 0; |
6397 | } | |
6398 | ||
f0486c68 | 6399 | /* |
e688b725 CM |
6400 | * this function must be called within transaction |
6401 | */ | |
2ff7e61e | 6402 | int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info, |
e688b725 CM |
6403 | u64 bytenr, u64 num_bytes) |
6404 | { | |
6405 | struct btrfs_block_group_cache *cache; | |
b50c6e25 | 6406 | int ret; |
e688b725 | 6407 | |
0b246afa | 6408 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
b50c6e25 JB |
6409 | if (!cache) |
6410 | return -EINVAL; | |
e688b725 CM |
6411 | |
6412 | /* | |
6413 | * pull in the free space cache (if any) so that our pin | |
6414 | * removes the free space from the cache. We have load_only set | |
6415 | * to one because the slow code to read in the free extents does check | |
6416 | * the pinned extents. | |
6417 | */ | |
f6373bf3 | 6418 | cache_block_group(cache, 1); |
e688b725 | 6419 | |
2ff7e61e | 6420 | pin_down_extent(fs_info, cache, bytenr, num_bytes, 0); |
e688b725 CM |
6421 | |
6422 | /* remove us from the free space cache (if we're there at all) */ | |
b50c6e25 | 6423 | ret = btrfs_remove_free_space(cache, bytenr, num_bytes); |
e688b725 | 6424 | btrfs_put_block_group(cache); |
b50c6e25 | 6425 | return ret; |
e688b725 CM |
6426 | } |
6427 | ||
2ff7e61e JM |
6428 | static int __exclude_logged_extent(struct btrfs_fs_info *fs_info, |
6429 | u64 start, u64 num_bytes) | |
8c2a1a30 JB |
6430 | { |
6431 | int ret; | |
6432 | struct btrfs_block_group_cache *block_group; | |
6433 | struct btrfs_caching_control *caching_ctl; | |
6434 | ||
0b246afa | 6435 | block_group = btrfs_lookup_block_group(fs_info, start); |
8c2a1a30 JB |
6436 | if (!block_group) |
6437 | return -EINVAL; | |
6438 | ||
6439 | cache_block_group(block_group, 0); | |
6440 | caching_ctl = get_caching_control(block_group); | |
6441 | ||
6442 | if (!caching_ctl) { | |
6443 | /* Logic error */ | |
6444 | BUG_ON(!block_group_cache_done(block_group)); | |
6445 | ret = btrfs_remove_free_space(block_group, start, num_bytes); | |
6446 | } else { | |
6447 | mutex_lock(&caching_ctl->mutex); | |
6448 | ||
6449 | if (start >= caching_ctl->progress) { | |
2ff7e61e | 6450 | ret = add_excluded_extent(fs_info, start, num_bytes); |
8c2a1a30 JB |
6451 | } else if (start + num_bytes <= caching_ctl->progress) { |
6452 | ret = btrfs_remove_free_space(block_group, | |
6453 | start, num_bytes); | |
6454 | } else { | |
6455 | num_bytes = caching_ctl->progress - start; | |
6456 | ret = btrfs_remove_free_space(block_group, | |
6457 | start, num_bytes); | |
6458 | if (ret) | |
6459 | goto out_lock; | |
6460 | ||
6461 | num_bytes = (start + num_bytes) - | |
6462 | caching_ctl->progress; | |
6463 | start = caching_ctl->progress; | |
2ff7e61e | 6464 | ret = add_excluded_extent(fs_info, start, num_bytes); |
8c2a1a30 JB |
6465 | } |
6466 | out_lock: | |
6467 | mutex_unlock(&caching_ctl->mutex); | |
6468 | put_caching_control(caching_ctl); | |
6469 | } | |
6470 | btrfs_put_block_group(block_group); | |
6471 | return ret; | |
6472 | } | |
6473 | ||
2ff7e61e | 6474 | int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info, |
8c2a1a30 JB |
6475 | struct extent_buffer *eb) |
6476 | { | |
6477 | struct btrfs_file_extent_item *item; | |
6478 | struct btrfs_key key; | |
6479 | int found_type; | |
6480 | int i; | |
b89311ef | 6481 | int ret = 0; |
8c2a1a30 | 6482 | |
2ff7e61e | 6483 | if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) |
8c2a1a30 JB |
6484 | return 0; |
6485 | ||
6486 | for (i = 0; i < btrfs_header_nritems(eb); i++) { | |
6487 | btrfs_item_key_to_cpu(eb, &key, i); | |
6488 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
6489 | continue; | |
6490 | item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); | |
6491 | found_type = btrfs_file_extent_type(eb, item); | |
6492 | if (found_type == BTRFS_FILE_EXTENT_INLINE) | |
6493 | continue; | |
6494 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
6495 | continue; | |
6496 | key.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
6497 | key.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
b89311ef GJ |
6498 | ret = __exclude_logged_extent(fs_info, key.objectid, key.offset); |
6499 | if (ret) | |
6500 | break; | |
8c2a1a30 JB |
6501 | } |
6502 | ||
b89311ef | 6503 | return ret; |
8c2a1a30 JB |
6504 | } |
6505 | ||
9cfa3e34 FM |
6506 | static void |
6507 | btrfs_inc_block_group_reservations(struct btrfs_block_group_cache *bg) | |
6508 | { | |
6509 | atomic_inc(&bg->reservations); | |
6510 | } | |
6511 | ||
6512 | void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, | |
6513 | const u64 start) | |
6514 | { | |
6515 | struct btrfs_block_group_cache *bg; | |
6516 | ||
6517 | bg = btrfs_lookup_block_group(fs_info, start); | |
6518 | ASSERT(bg); | |
6519 | if (atomic_dec_and_test(&bg->reservations)) | |
4625956a | 6520 | wake_up_var(&bg->reservations); |
9cfa3e34 FM |
6521 | btrfs_put_block_group(bg); |
6522 | } | |
6523 | ||
9cfa3e34 FM |
6524 | void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg) |
6525 | { | |
6526 | struct btrfs_space_info *space_info = bg->space_info; | |
6527 | ||
6528 | ASSERT(bg->ro); | |
6529 | ||
6530 | if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA)) | |
6531 | return; | |
6532 | ||
6533 | /* | |
6534 | * Our block group is read only but before we set it to read only, | |
6535 | * some task might have had allocated an extent from it already, but it | |
6536 | * has not yet created a respective ordered extent (and added it to a | |
6537 | * root's list of ordered extents). | |
6538 | * Therefore wait for any task currently allocating extents, since the | |
6539 | * block group's reservations counter is incremented while a read lock | |
6540 | * on the groups' semaphore is held and decremented after releasing | |
6541 | * the read access on that semaphore and creating the ordered extent. | |
6542 | */ | |
6543 | down_write(&space_info->groups_sem); | |
6544 | up_write(&space_info->groups_sem); | |
6545 | ||
4625956a | 6546 | wait_var_event(&bg->reservations, !atomic_read(&bg->reservations)); |
9cfa3e34 FM |
6547 | } |
6548 | ||
fb25e914 | 6549 | /** |
4824f1f4 | 6550 | * btrfs_add_reserved_bytes - update the block_group and space info counters |
fb25e914 | 6551 | * @cache: The cache we are manipulating |
18513091 WX |
6552 | * @ram_bytes: The number of bytes of file content, and will be same to |
6553 | * @num_bytes except for the compress path. | |
fb25e914 | 6554 | * @num_bytes: The number of bytes in question |
e570fd27 | 6555 | * @delalloc: The blocks are allocated for the delalloc write |
fb25e914 | 6556 | * |
745699ef XW |
6557 | * This is called by the allocator when it reserves space. If this is a |
6558 | * reservation and the block group has become read only we cannot make the | |
6559 | * reservation and return -EAGAIN, otherwise this function always succeeds. | |
f0486c68 | 6560 | */ |
4824f1f4 | 6561 | static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache, |
18513091 | 6562 | u64 ram_bytes, u64 num_bytes, int delalloc) |
11833d66 | 6563 | { |
fb25e914 | 6564 | struct btrfs_space_info *space_info = cache->space_info; |
f0486c68 | 6565 | int ret = 0; |
79787eaa | 6566 | |
fb25e914 JB |
6567 | spin_lock(&space_info->lock); |
6568 | spin_lock(&cache->lock); | |
4824f1f4 WX |
6569 | if (cache->ro) { |
6570 | ret = -EAGAIN; | |
fb25e914 | 6571 | } else { |
4824f1f4 WX |
6572 | cache->reserved += num_bytes; |
6573 | space_info->bytes_reserved += num_bytes; | |
e570fd27 | 6574 | |
18513091 WX |
6575 | trace_btrfs_space_reservation(cache->fs_info, |
6576 | "space_info", space_info->flags, | |
6577 | ram_bytes, 0); | |
6578 | space_info->bytes_may_use -= ram_bytes; | |
e570fd27 | 6579 | if (delalloc) |
4824f1f4 | 6580 | cache->delalloc_bytes += num_bytes; |
324ae4df | 6581 | } |
fb25e914 JB |
6582 | spin_unlock(&cache->lock); |
6583 | spin_unlock(&space_info->lock); | |
f0486c68 | 6584 | return ret; |
324ae4df | 6585 | } |
9078a3e1 | 6586 | |
4824f1f4 WX |
6587 | /** |
6588 | * btrfs_free_reserved_bytes - update the block_group and space info counters | |
6589 | * @cache: The cache we are manipulating | |
6590 | * @num_bytes: The number of bytes in question | |
6591 | * @delalloc: The blocks are allocated for the delalloc write | |
6592 | * | |
6593 | * This is called by somebody who is freeing space that was never actually used | |
6594 | * on disk. For example if you reserve some space for a new leaf in transaction | |
6595 | * A and before transaction A commits you free that leaf, you call this with | |
6596 | * reserve set to 0 in order to clear the reservation. | |
6597 | */ | |
6598 | ||
6599 | static int btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache, | |
6600 | u64 num_bytes, int delalloc) | |
6601 | { | |
6602 | struct btrfs_space_info *space_info = cache->space_info; | |
6603 | int ret = 0; | |
6604 | ||
6605 | spin_lock(&space_info->lock); | |
6606 | spin_lock(&cache->lock); | |
6607 | if (cache->ro) | |
6608 | space_info->bytes_readonly += num_bytes; | |
6609 | cache->reserved -= num_bytes; | |
6610 | space_info->bytes_reserved -= num_bytes; | |
6611 | ||
6612 | if (delalloc) | |
6613 | cache->delalloc_bytes -= num_bytes; | |
6614 | spin_unlock(&cache->lock); | |
6615 | spin_unlock(&space_info->lock); | |
6616 | return ret; | |
6617 | } | |
8b74c03e | 6618 | void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info) |
e8569813 | 6619 | { |
11833d66 YZ |
6620 | struct btrfs_caching_control *next; |
6621 | struct btrfs_caching_control *caching_ctl; | |
6622 | struct btrfs_block_group_cache *cache; | |
e8569813 | 6623 | |
9e351cc8 | 6624 | down_write(&fs_info->commit_root_sem); |
25179201 | 6625 | |
11833d66 YZ |
6626 | list_for_each_entry_safe(caching_ctl, next, |
6627 | &fs_info->caching_block_groups, list) { | |
6628 | cache = caching_ctl->block_group; | |
6629 | if (block_group_cache_done(cache)) { | |
6630 | cache->last_byte_to_unpin = (u64)-1; | |
6631 | list_del_init(&caching_ctl->list); | |
6632 | put_caching_control(caching_ctl); | |
e8569813 | 6633 | } else { |
11833d66 | 6634 | cache->last_byte_to_unpin = caching_ctl->progress; |
e8569813 | 6635 | } |
e8569813 | 6636 | } |
11833d66 YZ |
6637 | |
6638 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) | |
6639 | fs_info->pinned_extents = &fs_info->freed_extents[1]; | |
6640 | else | |
6641 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
6642 | ||
9e351cc8 | 6643 | up_write(&fs_info->commit_root_sem); |
8929ecfa YZ |
6644 | |
6645 | update_global_block_rsv(fs_info); | |
e8569813 ZY |
6646 | } |
6647 | ||
c759c4e1 JB |
6648 | /* |
6649 | * Returns the free cluster for the given space info and sets empty_cluster to | |
6650 | * what it should be based on the mount options. | |
6651 | */ | |
6652 | static struct btrfs_free_cluster * | |
2ff7e61e JM |
6653 | fetch_cluster_info(struct btrfs_fs_info *fs_info, |
6654 | struct btrfs_space_info *space_info, u64 *empty_cluster) | |
c759c4e1 JB |
6655 | { |
6656 | struct btrfs_free_cluster *ret = NULL; | |
c759c4e1 JB |
6657 | |
6658 | *empty_cluster = 0; | |
6659 | if (btrfs_mixed_space_info(space_info)) | |
6660 | return ret; | |
6661 | ||
c759c4e1 | 6662 | if (space_info->flags & BTRFS_BLOCK_GROUP_METADATA) { |
0b246afa | 6663 | ret = &fs_info->meta_alloc_cluster; |
583b7231 HK |
6664 | if (btrfs_test_opt(fs_info, SSD)) |
6665 | *empty_cluster = SZ_2M; | |
6666 | else | |
ee22184b | 6667 | *empty_cluster = SZ_64K; |
583b7231 HK |
6668 | } else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) && |
6669 | btrfs_test_opt(fs_info, SSD_SPREAD)) { | |
6670 | *empty_cluster = SZ_2M; | |
0b246afa | 6671 | ret = &fs_info->data_alloc_cluster; |
c759c4e1 JB |
6672 | } |
6673 | ||
6674 | return ret; | |
6675 | } | |
6676 | ||
2ff7e61e JM |
6677 | static int unpin_extent_range(struct btrfs_fs_info *fs_info, |
6678 | u64 start, u64 end, | |
678886bd | 6679 | const bool return_free_space) |
ccd467d6 | 6680 | { |
11833d66 | 6681 | struct btrfs_block_group_cache *cache = NULL; |
7b398f8e JB |
6682 | struct btrfs_space_info *space_info; |
6683 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; | |
c759c4e1 | 6684 | struct btrfs_free_cluster *cluster = NULL; |
11833d66 | 6685 | u64 len; |
c759c4e1 JB |
6686 | u64 total_unpinned = 0; |
6687 | u64 empty_cluster = 0; | |
7b398f8e | 6688 | bool readonly; |
ccd467d6 | 6689 | |
11833d66 | 6690 | while (start <= end) { |
7b398f8e | 6691 | readonly = false; |
11833d66 YZ |
6692 | if (!cache || |
6693 | start >= cache->key.objectid + cache->key.offset) { | |
6694 | if (cache) | |
6695 | btrfs_put_block_group(cache); | |
c759c4e1 | 6696 | total_unpinned = 0; |
11833d66 | 6697 | cache = btrfs_lookup_block_group(fs_info, start); |
79787eaa | 6698 | BUG_ON(!cache); /* Logic error */ |
c759c4e1 | 6699 | |
2ff7e61e | 6700 | cluster = fetch_cluster_info(fs_info, |
c759c4e1 JB |
6701 | cache->space_info, |
6702 | &empty_cluster); | |
6703 | empty_cluster <<= 1; | |
11833d66 YZ |
6704 | } |
6705 | ||
6706 | len = cache->key.objectid + cache->key.offset - start; | |
6707 | len = min(len, end + 1 - start); | |
6708 | ||
6709 | if (start < cache->last_byte_to_unpin) { | |
6710 | len = min(len, cache->last_byte_to_unpin - start); | |
678886bd FM |
6711 | if (return_free_space) |
6712 | btrfs_add_free_space(cache, start, len); | |
11833d66 YZ |
6713 | } |
6714 | ||
f0486c68 | 6715 | start += len; |
c759c4e1 | 6716 | total_unpinned += len; |
7b398f8e | 6717 | space_info = cache->space_info; |
f0486c68 | 6718 | |
c759c4e1 JB |
6719 | /* |
6720 | * If this space cluster has been marked as fragmented and we've | |
6721 | * unpinned enough in this block group to potentially allow a | |
6722 | * cluster to be created inside of it go ahead and clear the | |
6723 | * fragmented check. | |
6724 | */ | |
6725 | if (cluster && cluster->fragmented && | |
6726 | total_unpinned > empty_cluster) { | |
6727 | spin_lock(&cluster->lock); | |
6728 | cluster->fragmented = 0; | |
6729 | spin_unlock(&cluster->lock); | |
6730 | } | |
6731 | ||
7b398f8e | 6732 | spin_lock(&space_info->lock); |
11833d66 YZ |
6733 | spin_lock(&cache->lock); |
6734 | cache->pinned -= len; | |
7b398f8e | 6735 | space_info->bytes_pinned -= len; |
c51e7bb1 JB |
6736 | |
6737 | trace_btrfs_space_reservation(fs_info, "pinned", | |
6738 | space_info->flags, len, 0); | |
4f4db217 | 6739 | space_info->max_extent_size = 0; |
d288db5d | 6740 | percpu_counter_add(&space_info->total_bytes_pinned, -len); |
7b398f8e JB |
6741 | if (cache->ro) { |
6742 | space_info->bytes_readonly += len; | |
6743 | readonly = true; | |
6744 | } | |
11833d66 | 6745 | spin_unlock(&cache->lock); |
957780eb JB |
6746 | if (!readonly && return_free_space && |
6747 | global_rsv->space_info == space_info) { | |
6748 | u64 to_add = len; | |
92ac58ec | 6749 | |
7b398f8e JB |
6750 | spin_lock(&global_rsv->lock); |
6751 | if (!global_rsv->full) { | |
957780eb JB |
6752 | to_add = min(len, global_rsv->size - |
6753 | global_rsv->reserved); | |
6754 | global_rsv->reserved += to_add; | |
6755 | space_info->bytes_may_use += to_add; | |
7b398f8e JB |
6756 | if (global_rsv->reserved >= global_rsv->size) |
6757 | global_rsv->full = 1; | |
957780eb JB |
6758 | trace_btrfs_space_reservation(fs_info, |
6759 | "space_info", | |
6760 | space_info->flags, | |
6761 | to_add, 1); | |
6762 | len -= to_add; | |
7b398f8e JB |
6763 | } |
6764 | spin_unlock(&global_rsv->lock); | |
957780eb JB |
6765 | /* Add to any tickets we may have */ |
6766 | if (len) | |
6767 | space_info_add_new_bytes(fs_info, space_info, | |
6768 | len); | |
7b398f8e JB |
6769 | } |
6770 | spin_unlock(&space_info->lock); | |
ccd467d6 | 6771 | } |
11833d66 YZ |
6772 | |
6773 | if (cache) | |
6774 | btrfs_put_block_group(cache); | |
ccd467d6 CM |
6775 | return 0; |
6776 | } | |
6777 | ||
5ead2dd0 | 6778 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans) |
a28ec197 | 6779 | { |
5ead2dd0 | 6780 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e33e17ee JM |
6781 | struct btrfs_block_group_cache *block_group, *tmp; |
6782 | struct list_head *deleted_bgs; | |
11833d66 | 6783 | struct extent_io_tree *unpin; |
1a5bc167 CM |
6784 | u64 start; |
6785 | u64 end; | |
a28ec197 | 6786 | int ret; |
a28ec197 | 6787 | |
11833d66 YZ |
6788 | if (fs_info->pinned_extents == &fs_info->freed_extents[0]) |
6789 | unpin = &fs_info->freed_extents[1]; | |
6790 | else | |
6791 | unpin = &fs_info->freed_extents[0]; | |
6792 | ||
e33e17ee | 6793 | while (!trans->aborted) { |
d4b450cd | 6794 | mutex_lock(&fs_info->unused_bg_unpin_mutex); |
1a5bc167 | 6795 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
e6138876 | 6796 | EXTENT_DIRTY, NULL); |
d4b450cd FM |
6797 | if (ret) { |
6798 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); | |
a28ec197 | 6799 | break; |
d4b450cd | 6800 | } |
1f3c79a2 | 6801 | |
0b246afa | 6802 | if (btrfs_test_opt(fs_info, DISCARD)) |
2ff7e61e | 6803 | ret = btrfs_discard_extent(fs_info, start, |
5378e607 | 6804 | end + 1 - start, NULL); |
1f3c79a2 | 6805 | |
af6f8f60 | 6806 | clear_extent_dirty(unpin, start, end); |
2ff7e61e | 6807 | unpin_extent_range(fs_info, start, end, true); |
d4b450cd | 6808 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
b9473439 | 6809 | cond_resched(); |
a28ec197 | 6810 | } |
817d52f8 | 6811 | |
e33e17ee JM |
6812 | /* |
6813 | * Transaction is finished. We don't need the lock anymore. We | |
6814 | * do need to clean up the block groups in case of a transaction | |
6815 | * abort. | |
6816 | */ | |
6817 | deleted_bgs = &trans->transaction->deleted_bgs; | |
6818 | list_for_each_entry_safe(block_group, tmp, deleted_bgs, bg_list) { | |
6819 | u64 trimmed = 0; | |
6820 | ||
6821 | ret = -EROFS; | |
6822 | if (!trans->aborted) | |
2ff7e61e | 6823 | ret = btrfs_discard_extent(fs_info, |
e33e17ee JM |
6824 | block_group->key.objectid, |
6825 | block_group->key.offset, | |
6826 | &trimmed); | |
6827 | ||
6828 | list_del_init(&block_group->bg_list); | |
6829 | btrfs_put_block_group_trimming(block_group); | |
6830 | btrfs_put_block_group(block_group); | |
6831 | ||
6832 | if (ret) { | |
6833 | const char *errstr = btrfs_decode_error(ret); | |
6834 | btrfs_warn(fs_info, | |
913e1535 | 6835 | "discard failed while removing blockgroup: errno=%d %s", |
e33e17ee JM |
6836 | ret, errstr); |
6837 | } | |
6838 | } | |
6839 | ||
e20d96d6 CM |
6840 | return 0; |
6841 | } | |
6842 | ||
5d4f98a2 | 6843 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
2ff7e61e | 6844 | struct btrfs_fs_info *info, |
c682f9b3 | 6845 | struct btrfs_delayed_ref_node *node, u64 parent, |
5d4f98a2 YZ |
6846 | u64 root_objectid, u64 owner_objectid, |
6847 | u64 owner_offset, int refs_to_drop, | |
c682f9b3 | 6848 | struct btrfs_delayed_extent_op *extent_op) |
a28ec197 | 6849 | { |
e2fa7227 | 6850 | struct btrfs_key key; |
5d4f98a2 | 6851 | struct btrfs_path *path; |
1261ec42 | 6852 | struct btrfs_root *extent_root = info->extent_root; |
5f39d397 | 6853 | struct extent_buffer *leaf; |
5d4f98a2 YZ |
6854 | struct btrfs_extent_item *ei; |
6855 | struct btrfs_extent_inline_ref *iref; | |
a28ec197 | 6856 | int ret; |
5d4f98a2 | 6857 | int is_data; |
952fccac CM |
6858 | int extent_slot = 0; |
6859 | int found_extent = 0; | |
6860 | int num_to_del = 1; | |
5d4f98a2 YZ |
6861 | u32 item_size; |
6862 | u64 refs; | |
c682f9b3 QW |
6863 | u64 bytenr = node->bytenr; |
6864 | u64 num_bytes = node->num_bytes; | |
fcebe456 | 6865 | int last_ref = 0; |
0b246afa | 6866 | bool skinny_metadata = btrfs_fs_incompat(info, SKINNY_METADATA); |
037e6390 | 6867 | |
5caf2a00 | 6868 | path = btrfs_alloc_path(); |
54aa1f4d CM |
6869 | if (!path) |
6870 | return -ENOMEM; | |
5f26f772 | 6871 | |
e4058b54 | 6872 | path->reada = READA_FORWARD; |
b9473439 | 6873 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6874 | |
6875 | is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; | |
6876 | BUG_ON(!is_data && refs_to_drop != 1); | |
6877 | ||
3173a18f | 6878 | if (is_data) |
897ca819 | 6879 | skinny_metadata = false; |
3173a18f | 6880 | |
87bde3cd | 6881 | ret = lookup_extent_backref(trans, info, path, &iref, |
5d4f98a2 YZ |
6882 | bytenr, num_bytes, parent, |
6883 | root_objectid, owner_objectid, | |
6884 | owner_offset); | |
7bb86316 | 6885 | if (ret == 0) { |
952fccac | 6886 | extent_slot = path->slots[0]; |
5d4f98a2 YZ |
6887 | while (extent_slot >= 0) { |
6888 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
952fccac | 6889 | extent_slot); |
5d4f98a2 | 6890 | if (key.objectid != bytenr) |
952fccac | 6891 | break; |
5d4f98a2 YZ |
6892 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
6893 | key.offset == num_bytes) { | |
952fccac CM |
6894 | found_extent = 1; |
6895 | break; | |
6896 | } | |
3173a18f JB |
6897 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
6898 | key.offset == owner_objectid) { | |
6899 | found_extent = 1; | |
6900 | break; | |
6901 | } | |
952fccac CM |
6902 | if (path->slots[0] - extent_slot > 5) |
6903 | break; | |
5d4f98a2 | 6904 | extent_slot--; |
952fccac | 6905 | } |
5d4f98a2 YZ |
6906 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
6907 | item_size = btrfs_item_size_nr(path->nodes[0], extent_slot); | |
6908 | if (found_extent && item_size < sizeof(*ei)) | |
6909 | found_extent = 0; | |
6910 | #endif | |
31840ae1 | 6911 | if (!found_extent) { |
5d4f98a2 | 6912 | BUG_ON(iref); |
87bde3cd JM |
6913 | ret = remove_extent_backref(trans, info, path, NULL, |
6914 | refs_to_drop, | |
fcebe456 | 6915 | is_data, &last_ref); |
005d6427 | 6916 | if (ret) { |
66642832 | 6917 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6918 | goto out; |
6919 | } | |
b3b4aa74 | 6920 | btrfs_release_path(path); |
b9473439 | 6921 | path->leave_spinning = 1; |
5d4f98a2 YZ |
6922 | |
6923 | key.objectid = bytenr; | |
6924 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
6925 | key.offset = num_bytes; | |
6926 | ||
3173a18f JB |
6927 | if (!is_data && skinny_metadata) { |
6928 | key.type = BTRFS_METADATA_ITEM_KEY; | |
6929 | key.offset = owner_objectid; | |
6930 | } | |
6931 | ||
31840ae1 ZY |
6932 | ret = btrfs_search_slot(trans, extent_root, |
6933 | &key, path, -1, 1); | |
3173a18f JB |
6934 | if (ret > 0 && skinny_metadata && path->slots[0]) { |
6935 | /* | |
6936 | * Couldn't find our skinny metadata item, | |
6937 | * see if we have ye olde extent item. | |
6938 | */ | |
6939 | path->slots[0]--; | |
6940 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
6941 | path->slots[0]); | |
6942 | if (key.objectid == bytenr && | |
6943 | key.type == BTRFS_EXTENT_ITEM_KEY && | |
6944 | key.offset == num_bytes) | |
6945 | ret = 0; | |
6946 | } | |
6947 | ||
6948 | if (ret > 0 && skinny_metadata) { | |
6949 | skinny_metadata = false; | |
9ce49a0b | 6950 | key.objectid = bytenr; |
3173a18f JB |
6951 | key.type = BTRFS_EXTENT_ITEM_KEY; |
6952 | key.offset = num_bytes; | |
6953 | btrfs_release_path(path); | |
6954 | ret = btrfs_search_slot(trans, extent_root, | |
6955 | &key, path, -1, 1); | |
6956 | } | |
6957 | ||
f3465ca4 | 6958 | if (ret) { |
5d163e0e JM |
6959 | btrfs_err(info, |
6960 | "umm, got %d back from search, was looking for %llu", | |
6961 | ret, bytenr); | |
b783e62d | 6962 | if (ret > 0) |
a4f78750 | 6963 | btrfs_print_leaf(path->nodes[0]); |
f3465ca4 | 6964 | } |
005d6427 | 6965 | if (ret < 0) { |
66642832 | 6966 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6967 | goto out; |
6968 | } | |
31840ae1 ZY |
6969 | extent_slot = path->slots[0]; |
6970 | } | |
fae7f21c | 6971 | } else if (WARN_ON(ret == -ENOENT)) { |
a4f78750 | 6972 | btrfs_print_leaf(path->nodes[0]); |
c2cf52eb SK |
6973 | btrfs_err(info, |
6974 | "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu", | |
c1c9ff7c GU |
6975 | bytenr, parent, root_objectid, owner_objectid, |
6976 | owner_offset); | |
66642832 | 6977 | btrfs_abort_transaction(trans, ret); |
c4a050bb | 6978 | goto out; |
79787eaa | 6979 | } else { |
66642832 | 6980 | btrfs_abort_transaction(trans, ret); |
005d6427 | 6981 | goto out; |
7bb86316 | 6982 | } |
5f39d397 CM |
6983 | |
6984 | leaf = path->nodes[0]; | |
5d4f98a2 YZ |
6985 | item_size = btrfs_item_size_nr(leaf, extent_slot); |
6986 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 | |
6987 | if (item_size < sizeof(*ei)) { | |
6988 | BUG_ON(found_extent || extent_slot != path->slots[0]); | |
87bde3cd JM |
6989 | ret = convert_extent_item_v0(trans, info, path, owner_objectid, |
6990 | 0); | |
005d6427 | 6991 | if (ret < 0) { |
66642832 | 6992 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
6993 | goto out; |
6994 | } | |
5d4f98a2 | 6995 | |
b3b4aa74 | 6996 | btrfs_release_path(path); |
5d4f98a2 YZ |
6997 | path->leave_spinning = 1; |
6998 | ||
6999 | key.objectid = bytenr; | |
7000 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
7001 | key.offset = num_bytes; | |
7002 | ||
7003 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
7004 | -1, 1); | |
7005 | if (ret) { | |
5d163e0e JM |
7006 | btrfs_err(info, |
7007 | "umm, got %d back from search, was looking for %llu", | |
c1c9ff7c | 7008 | ret, bytenr); |
a4f78750 | 7009 | btrfs_print_leaf(path->nodes[0]); |
5d4f98a2 | 7010 | } |
005d6427 | 7011 | if (ret < 0) { |
66642832 | 7012 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
7013 | goto out; |
7014 | } | |
7015 | ||
5d4f98a2 YZ |
7016 | extent_slot = path->slots[0]; |
7017 | leaf = path->nodes[0]; | |
7018 | item_size = btrfs_item_size_nr(leaf, extent_slot); | |
7019 | } | |
7020 | #endif | |
7021 | BUG_ON(item_size < sizeof(*ei)); | |
952fccac | 7022 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 7023 | struct btrfs_extent_item); |
3173a18f JB |
7024 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID && |
7025 | key.type == BTRFS_EXTENT_ITEM_KEY) { | |
5d4f98a2 YZ |
7026 | struct btrfs_tree_block_info *bi; |
7027 | BUG_ON(item_size < sizeof(*ei) + sizeof(*bi)); | |
7028 | bi = (struct btrfs_tree_block_info *)(ei + 1); | |
7029 | WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi)); | |
7030 | } | |
56bec294 | 7031 | |
5d4f98a2 | 7032 | refs = btrfs_extent_refs(leaf, ei); |
32b02538 | 7033 | if (refs < refs_to_drop) { |
5d163e0e JM |
7034 | btrfs_err(info, |
7035 | "trying to drop %d refs but we only have %Lu for bytenr %Lu", | |
7036 | refs_to_drop, refs, bytenr); | |
32b02538 | 7037 | ret = -EINVAL; |
66642832 | 7038 | btrfs_abort_transaction(trans, ret); |
32b02538 JB |
7039 | goto out; |
7040 | } | |
56bec294 | 7041 | refs -= refs_to_drop; |
5f39d397 | 7042 | |
5d4f98a2 YZ |
7043 | if (refs > 0) { |
7044 | if (extent_op) | |
7045 | __run_delayed_extent_op(extent_op, leaf, ei); | |
7046 | /* | |
7047 | * In the case of inline back ref, reference count will | |
7048 | * be updated by remove_extent_backref | |
952fccac | 7049 | */ |
5d4f98a2 YZ |
7050 | if (iref) { |
7051 | BUG_ON(!found_extent); | |
7052 | } else { | |
7053 | btrfs_set_extent_refs(leaf, ei, refs); | |
7054 | btrfs_mark_buffer_dirty(leaf); | |
7055 | } | |
7056 | if (found_extent) { | |
87bde3cd | 7057 | ret = remove_extent_backref(trans, info, path, |
5d4f98a2 | 7058 | iref, refs_to_drop, |
fcebe456 | 7059 | is_data, &last_ref); |
005d6427 | 7060 | if (ret) { |
66642832 | 7061 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
7062 | goto out; |
7063 | } | |
952fccac | 7064 | } |
5d4f98a2 | 7065 | } else { |
5d4f98a2 YZ |
7066 | if (found_extent) { |
7067 | BUG_ON(is_data && refs_to_drop != | |
9ed0dea0 | 7068 | extent_data_ref_count(path, iref)); |
5d4f98a2 YZ |
7069 | if (iref) { |
7070 | BUG_ON(path->slots[0] != extent_slot); | |
7071 | } else { | |
7072 | BUG_ON(path->slots[0] != extent_slot + 1); | |
7073 | path->slots[0] = extent_slot; | |
7074 | num_to_del = 2; | |
7075 | } | |
78fae27e | 7076 | } |
b9473439 | 7077 | |
fcebe456 | 7078 | last_ref = 1; |
952fccac CM |
7079 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
7080 | num_to_del); | |
005d6427 | 7081 | if (ret) { |
66642832 | 7082 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
7083 | goto out; |
7084 | } | |
b3b4aa74 | 7085 | btrfs_release_path(path); |
21af804c | 7086 | |
5d4f98a2 | 7087 | if (is_data) { |
5b4aacef | 7088 | ret = btrfs_del_csums(trans, info, bytenr, num_bytes); |
005d6427 | 7089 | if (ret) { |
66642832 | 7090 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
7091 | goto out; |
7092 | } | |
459931ec CM |
7093 | } |
7094 | ||
e7355e50 | 7095 | ret = add_to_free_space_tree(trans, bytenr, num_bytes); |
1e144fb8 | 7096 | if (ret) { |
66642832 | 7097 | btrfs_abort_transaction(trans, ret); |
1e144fb8 OS |
7098 | goto out; |
7099 | } | |
7100 | ||
0b246afa | 7101 | ret = update_block_group(trans, info, bytenr, num_bytes, 0); |
005d6427 | 7102 | if (ret) { |
66642832 | 7103 | btrfs_abort_transaction(trans, ret); |
005d6427 DS |
7104 | goto out; |
7105 | } | |
a28ec197 | 7106 | } |
fcebe456 JB |
7107 | btrfs_release_path(path); |
7108 | ||
79787eaa | 7109 | out: |
5caf2a00 | 7110 | btrfs_free_path(path); |
a28ec197 CM |
7111 | return ret; |
7112 | } | |
7113 | ||
1887be66 | 7114 | /* |
f0486c68 | 7115 | * when we free an block, it is possible (and likely) that we free the last |
1887be66 CM |
7116 | * delayed ref for that extent as well. This searches the delayed ref tree for |
7117 | * a given extent, and if there are no other delayed refs to be processed, it | |
7118 | * removes it from the tree. | |
7119 | */ | |
7120 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, | |
2ff7e61e | 7121 | u64 bytenr) |
1887be66 CM |
7122 | { |
7123 | struct btrfs_delayed_ref_head *head; | |
7124 | struct btrfs_delayed_ref_root *delayed_refs; | |
f0486c68 | 7125 | int ret = 0; |
1887be66 CM |
7126 | |
7127 | delayed_refs = &trans->transaction->delayed_refs; | |
7128 | spin_lock(&delayed_refs->lock); | |
f72ad18e | 7129 | head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); |
1887be66 | 7130 | if (!head) |
cf93da7b | 7131 | goto out_delayed_unlock; |
1887be66 | 7132 | |
d7df2c79 | 7133 | spin_lock(&head->lock); |
0e0adbcf | 7134 | if (!RB_EMPTY_ROOT(&head->ref_tree)) |
1887be66 CM |
7135 | goto out; |
7136 | ||
5d4f98a2 YZ |
7137 | if (head->extent_op) { |
7138 | if (!head->must_insert_reserved) | |
7139 | goto out; | |
78a6184a | 7140 | btrfs_free_delayed_extent_op(head->extent_op); |
5d4f98a2 YZ |
7141 | head->extent_op = NULL; |
7142 | } | |
7143 | ||
1887be66 CM |
7144 | /* |
7145 | * waiting for the lock here would deadlock. If someone else has it | |
7146 | * locked they are already in the process of dropping it anyway | |
7147 | */ | |
7148 | if (!mutex_trylock(&head->mutex)) | |
7149 | goto out; | |
7150 | ||
7151 | /* | |
7152 | * at this point we have a head with no other entries. Go | |
7153 | * ahead and process it. | |
7154 | */ | |
c46effa6 | 7155 | rb_erase(&head->href_node, &delayed_refs->href_root); |
d278850e | 7156 | RB_CLEAR_NODE(&head->href_node); |
d7df2c79 | 7157 | atomic_dec(&delayed_refs->num_entries); |
1887be66 CM |
7158 | |
7159 | /* | |
7160 | * we don't take a ref on the node because we're removing it from the | |
7161 | * tree, so we just steal the ref the tree was holding. | |
7162 | */ | |
c3e69d58 | 7163 | delayed_refs->num_heads--; |
d7df2c79 | 7164 | if (head->processing == 0) |
c3e69d58 | 7165 | delayed_refs->num_heads_ready--; |
d7df2c79 JB |
7166 | head->processing = 0; |
7167 | spin_unlock(&head->lock); | |
1887be66 CM |
7168 | spin_unlock(&delayed_refs->lock); |
7169 | ||
f0486c68 YZ |
7170 | BUG_ON(head->extent_op); |
7171 | if (head->must_insert_reserved) | |
7172 | ret = 1; | |
7173 | ||
7174 | mutex_unlock(&head->mutex); | |
d278850e | 7175 | btrfs_put_delayed_ref_head(head); |
f0486c68 | 7176 | return ret; |
1887be66 | 7177 | out: |
d7df2c79 | 7178 | spin_unlock(&head->lock); |
cf93da7b CM |
7179 | |
7180 | out_delayed_unlock: | |
1887be66 CM |
7181 | spin_unlock(&delayed_refs->lock); |
7182 | return 0; | |
7183 | } | |
7184 | ||
f0486c68 YZ |
7185 | void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
7186 | struct btrfs_root *root, | |
7187 | struct extent_buffer *buf, | |
5581a51a | 7188 | u64 parent, int last_ref) |
f0486c68 | 7189 | { |
0b246afa | 7190 | struct btrfs_fs_info *fs_info = root->fs_info; |
b150a4f1 | 7191 | int pin = 1; |
f0486c68 YZ |
7192 | int ret; |
7193 | ||
7194 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
d7eae340 OS |
7195 | int old_ref_mod, new_ref_mod; |
7196 | ||
fd708b81 JB |
7197 | btrfs_ref_tree_mod(root, buf->start, buf->len, parent, |
7198 | root->root_key.objectid, | |
7199 | btrfs_header_level(buf), 0, | |
7200 | BTRFS_DROP_DELAYED_REF); | |
7be07912 OS |
7201 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, buf->start, |
7202 | buf->len, parent, | |
0b246afa JM |
7203 | root->root_key.objectid, |
7204 | btrfs_header_level(buf), | |
7be07912 | 7205 | BTRFS_DROP_DELAYED_REF, NULL, |
d7eae340 | 7206 | &old_ref_mod, &new_ref_mod); |
79787eaa | 7207 | BUG_ON(ret); /* -ENOMEM */ |
d7eae340 | 7208 | pin = old_ref_mod >= 0 && new_ref_mod < 0; |
f0486c68 YZ |
7209 | } |
7210 | ||
0a16c7d7 | 7211 | if (last_ref && btrfs_header_generation(buf) == trans->transid) { |
6219872d FM |
7212 | struct btrfs_block_group_cache *cache; |
7213 | ||
f0486c68 | 7214 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { |
2ff7e61e | 7215 | ret = check_ref_cleanup(trans, buf->start); |
f0486c68 | 7216 | if (!ret) |
37be25bc | 7217 | goto out; |
f0486c68 YZ |
7218 | } |
7219 | ||
4da8b76d | 7220 | pin = 0; |
0b246afa | 7221 | cache = btrfs_lookup_block_group(fs_info, buf->start); |
6219872d | 7222 | |
f0486c68 | 7223 | if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
2ff7e61e JM |
7224 | pin_down_extent(fs_info, cache, buf->start, |
7225 | buf->len, 1); | |
6219872d | 7226 | btrfs_put_block_group(cache); |
37be25bc | 7227 | goto out; |
f0486c68 YZ |
7228 | } |
7229 | ||
7230 | WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); | |
7231 | ||
7232 | btrfs_add_free_space(cache, buf->start, buf->len); | |
4824f1f4 | 7233 | btrfs_free_reserved_bytes(cache, buf->len, 0); |
6219872d | 7234 | btrfs_put_block_group(cache); |
71ff6437 | 7235 | trace_btrfs_reserved_extent_free(fs_info, buf->start, buf->len); |
f0486c68 YZ |
7236 | } |
7237 | out: | |
b150a4f1 | 7238 | if (pin) |
29d2b84c | 7239 | add_pinned_bytes(fs_info, buf->len, true, |
b150a4f1 JB |
7240 | root->root_key.objectid); |
7241 | ||
0a16c7d7 OS |
7242 | if (last_ref) { |
7243 | /* | |
7244 | * Deleting the buffer, clear the corrupt flag since it doesn't | |
7245 | * matter anymore. | |
7246 | */ | |
7247 | clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags); | |
7248 | } | |
f0486c68 YZ |
7249 | } |
7250 | ||
79787eaa | 7251 | /* Can return -ENOMEM */ |
2ff7e61e | 7252 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
84f7d8e6 | 7253 | struct btrfs_root *root, |
66d7e7f0 | 7254 | u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, |
b06c4bf5 | 7255 | u64 owner, u64 offset) |
925baedd | 7256 | { |
84f7d8e6 | 7257 | struct btrfs_fs_info *fs_info = root->fs_info; |
d7eae340 | 7258 | int old_ref_mod, new_ref_mod; |
925baedd CM |
7259 | int ret; |
7260 | ||
f5ee5c9a | 7261 | if (btrfs_is_testing(fs_info)) |
faa2dbf0 | 7262 | return 0; |
fccb84c9 | 7263 | |
fd708b81 JB |
7264 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) |
7265 | btrfs_ref_tree_mod(root, bytenr, num_bytes, parent, | |
7266 | root_objectid, owner, offset, | |
7267 | BTRFS_DROP_DELAYED_REF); | |
7268 | ||
56bec294 CM |
7269 | /* |
7270 | * tree log blocks never actually go into the extent allocation | |
7271 | * tree, just update pinning info and exit early. | |
56bec294 | 7272 | */ |
5d4f98a2 YZ |
7273 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) { |
7274 | WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID); | |
b9473439 | 7275 | /* unlocks the pinned mutex */ |
2ff7e61e | 7276 | btrfs_pin_extent(fs_info, bytenr, num_bytes, 1); |
d7eae340 | 7277 | old_ref_mod = new_ref_mod = 0; |
56bec294 | 7278 | ret = 0; |
5d4f98a2 | 7279 | } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { |
66d7e7f0 | 7280 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr, |
7be07912 OS |
7281 | num_bytes, parent, |
7282 | root_objectid, (int)owner, | |
7283 | BTRFS_DROP_DELAYED_REF, NULL, | |
d7eae340 | 7284 | &old_ref_mod, &new_ref_mod); |
5d4f98a2 | 7285 | } else { |
66d7e7f0 | 7286 | ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr, |
7be07912 OS |
7287 | num_bytes, parent, |
7288 | root_objectid, owner, offset, | |
7289 | 0, BTRFS_DROP_DELAYED_REF, | |
d7eae340 | 7290 | &old_ref_mod, &new_ref_mod); |
56bec294 | 7291 | } |
d7eae340 | 7292 | |
29d2b84c NB |
7293 | if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) { |
7294 | bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID; | |
7295 | ||
7296 | add_pinned_bytes(fs_info, num_bytes, metadata, root_objectid); | |
7297 | } | |
d7eae340 | 7298 | |
925baedd CM |
7299 | return ret; |
7300 | } | |
7301 | ||
817d52f8 JB |
7302 | /* |
7303 | * when we wait for progress in the block group caching, its because | |
7304 | * our allocation attempt failed at least once. So, we must sleep | |
7305 | * and let some progress happen before we try again. | |
7306 | * | |
7307 | * This function will sleep at least once waiting for new free space to | |
7308 | * show up, and then it will check the block group free space numbers | |
7309 | * for our min num_bytes. Another option is to have it go ahead | |
7310 | * and look in the rbtree for a free extent of a given size, but this | |
7311 | * is a good start. | |
36cce922 JB |
7312 | * |
7313 | * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using | |
7314 | * any of the information in this block group. | |
817d52f8 | 7315 | */ |
36cce922 | 7316 | static noinline void |
817d52f8 JB |
7317 | wait_block_group_cache_progress(struct btrfs_block_group_cache *cache, |
7318 | u64 num_bytes) | |
7319 | { | |
11833d66 | 7320 | struct btrfs_caching_control *caching_ctl; |
817d52f8 | 7321 | |
11833d66 YZ |
7322 | caching_ctl = get_caching_control(cache); |
7323 | if (!caching_ctl) | |
36cce922 | 7324 | return; |
817d52f8 | 7325 | |
11833d66 | 7326 | wait_event(caching_ctl->wait, block_group_cache_done(cache) || |
34d52cb6 | 7327 | (cache->free_space_ctl->free_space >= num_bytes)); |
11833d66 YZ |
7328 | |
7329 | put_caching_control(caching_ctl); | |
11833d66 YZ |
7330 | } |
7331 | ||
7332 | static noinline int | |
7333 | wait_block_group_cache_done(struct btrfs_block_group_cache *cache) | |
7334 | { | |
7335 | struct btrfs_caching_control *caching_ctl; | |
36cce922 | 7336 | int ret = 0; |
11833d66 YZ |
7337 | |
7338 | caching_ctl = get_caching_control(cache); | |
7339 | if (!caching_ctl) | |
36cce922 | 7340 | return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; |
11833d66 YZ |
7341 | |
7342 | wait_event(caching_ctl->wait, block_group_cache_done(cache)); | |
36cce922 JB |
7343 | if (cache->cached == BTRFS_CACHE_ERROR) |
7344 | ret = -EIO; | |
11833d66 | 7345 | put_caching_control(caching_ctl); |
36cce922 | 7346 | return ret; |
817d52f8 JB |
7347 | } |
7348 | ||
7349 | enum btrfs_loop_type { | |
285ff5af JB |
7350 | LOOP_CACHING_NOWAIT = 0, |
7351 | LOOP_CACHING_WAIT = 1, | |
7352 | LOOP_ALLOC_CHUNK = 2, | |
7353 | LOOP_NO_EMPTY_SIZE = 3, | |
817d52f8 JB |
7354 | }; |
7355 | ||
e570fd27 MX |
7356 | static inline void |
7357 | btrfs_lock_block_group(struct btrfs_block_group_cache *cache, | |
7358 | int delalloc) | |
7359 | { | |
7360 | if (delalloc) | |
7361 | down_read(&cache->data_rwsem); | |
7362 | } | |
7363 | ||
7364 | static inline void | |
7365 | btrfs_grab_block_group(struct btrfs_block_group_cache *cache, | |
7366 | int delalloc) | |
7367 | { | |
7368 | btrfs_get_block_group(cache); | |
7369 | if (delalloc) | |
7370 | down_read(&cache->data_rwsem); | |
7371 | } | |
7372 | ||
7373 | static struct btrfs_block_group_cache * | |
7374 | btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, | |
7375 | struct btrfs_free_cluster *cluster, | |
7376 | int delalloc) | |
7377 | { | |
89771cc9 | 7378 | struct btrfs_block_group_cache *used_bg = NULL; |
6719afdc | 7379 | |
e570fd27 | 7380 | spin_lock(&cluster->refill_lock); |
6719afdc GU |
7381 | while (1) { |
7382 | used_bg = cluster->block_group; | |
7383 | if (!used_bg) | |
7384 | return NULL; | |
7385 | ||
7386 | if (used_bg == block_group) | |
e570fd27 MX |
7387 | return used_bg; |
7388 | ||
6719afdc | 7389 | btrfs_get_block_group(used_bg); |
e570fd27 | 7390 | |
6719afdc GU |
7391 | if (!delalloc) |
7392 | return used_bg; | |
e570fd27 | 7393 | |
6719afdc GU |
7394 | if (down_read_trylock(&used_bg->data_rwsem)) |
7395 | return used_bg; | |
e570fd27 | 7396 | |
6719afdc | 7397 | spin_unlock(&cluster->refill_lock); |
e570fd27 | 7398 | |
e321f8a8 LB |
7399 | /* We should only have one-level nested. */ |
7400 | down_read_nested(&used_bg->data_rwsem, SINGLE_DEPTH_NESTING); | |
e570fd27 | 7401 | |
6719afdc GU |
7402 | spin_lock(&cluster->refill_lock); |
7403 | if (used_bg == cluster->block_group) | |
7404 | return used_bg; | |
e570fd27 | 7405 | |
6719afdc GU |
7406 | up_read(&used_bg->data_rwsem); |
7407 | btrfs_put_block_group(used_bg); | |
7408 | } | |
e570fd27 MX |
7409 | } |
7410 | ||
7411 | static inline void | |
7412 | btrfs_release_block_group(struct btrfs_block_group_cache *cache, | |
7413 | int delalloc) | |
7414 | { | |
7415 | if (delalloc) | |
7416 | up_read(&cache->data_rwsem); | |
7417 | btrfs_put_block_group(cache); | |
7418 | } | |
7419 | ||
fec577fb CM |
7420 | /* |
7421 | * walks the btree of allocated extents and find a hole of a given size. | |
7422 | * The key ins is changed to record the hole: | |
a4820398 | 7423 | * ins->objectid == start position |
62e2749e | 7424 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
a4820398 | 7425 | * ins->offset == the size of the hole. |
fec577fb | 7426 | * Any available blocks before search_start are skipped. |
a4820398 MX |
7427 | * |
7428 | * If there is no suitable free space, we will record the max size of | |
7429 | * the free space extent currently. | |
fec577fb | 7430 | */ |
87bde3cd | 7431 | static noinline int find_free_extent(struct btrfs_fs_info *fs_info, |
18513091 WX |
7432 | u64 ram_bytes, u64 num_bytes, u64 empty_size, |
7433 | u64 hint_byte, struct btrfs_key *ins, | |
7434 | u64 flags, int delalloc) | |
fec577fb | 7435 | { |
80eb234a | 7436 | int ret = 0; |
0b246afa | 7437 | struct btrfs_root *root = fs_info->extent_root; |
fa9c0d79 | 7438 | struct btrfs_free_cluster *last_ptr = NULL; |
80eb234a | 7439 | struct btrfs_block_group_cache *block_group = NULL; |
81c9ad23 | 7440 | u64 search_start = 0; |
a4820398 | 7441 | u64 max_extent_size = 0; |
c759c4e1 | 7442 | u64 empty_cluster = 0; |
80eb234a | 7443 | struct btrfs_space_info *space_info; |
fa9c0d79 | 7444 | int loop = 0; |
3e72ee88 | 7445 | int index = btrfs_bg_flags_to_raid_index(flags); |
0a24325e | 7446 | bool failed_cluster_refill = false; |
1cdda9b8 | 7447 | bool failed_alloc = false; |
67377734 | 7448 | bool use_cluster = true; |
60d2adbb | 7449 | bool have_caching_bg = false; |
13a0db5a | 7450 | bool orig_have_caching_bg = false; |
a5e681d9 | 7451 | bool full_search = false; |
fec577fb | 7452 | |
0b246afa | 7453 | WARN_ON(num_bytes < fs_info->sectorsize); |
962a298f | 7454 | ins->type = BTRFS_EXTENT_ITEM_KEY; |
80eb234a JB |
7455 | ins->objectid = 0; |
7456 | ins->offset = 0; | |
b1a4d965 | 7457 | |
71ff6437 | 7458 | trace_find_free_extent(fs_info, num_bytes, empty_size, flags); |
3f7de037 | 7459 | |
0b246afa | 7460 | space_info = __find_space_info(fs_info, flags); |
1b1d1f66 | 7461 | if (!space_info) { |
0b246afa | 7462 | btrfs_err(fs_info, "No space info for %llu", flags); |
1b1d1f66 JB |
7463 | return -ENOSPC; |
7464 | } | |
2552d17e | 7465 | |
67377734 | 7466 | /* |
4f4db217 JB |
7467 | * If our free space is heavily fragmented we may not be able to make |
7468 | * big contiguous allocations, so instead of doing the expensive search | |
7469 | * for free space, simply return ENOSPC with our max_extent_size so we | |
7470 | * can go ahead and search for a more manageable chunk. | |
7471 | * | |
7472 | * If our max_extent_size is large enough for our allocation simply | |
7473 | * disable clustering since we will likely not be able to find enough | |
7474 | * space to create a cluster and induce latency trying. | |
67377734 | 7475 | */ |
4f4db217 JB |
7476 | if (unlikely(space_info->max_extent_size)) { |
7477 | spin_lock(&space_info->lock); | |
7478 | if (space_info->max_extent_size && | |
7479 | num_bytes > space_info->max_extent_size) { | |
7480 | ins->offset = space_info->max_extent_size; | |
7481 | spin_unlock(&space_info->lock); | |
7482 | return -ENOSPC; | |
7483 | } else if (space_info->max_extent_size) { | |
7484 | use_cluster = false; | |
7485 | } | |
7486 | spin_unlock(&space_info->lock); | |
fa9c0d79 | 7487 | } |
0f9dd46c | 7488 | |
2ff7e61e | 7489 | last_ptr = fetch_cluster_info(fs_info, space_info, &empty_cluster); |
239b14b3 | 7490 | if (last_ptr) { |
fa9c0d79 CM |
7491 | spin_lock(&last_ptr->lock); |
7492 | if (last_ptr->block_group) | |
7493 | hint_byte = last_ptr->window_start; | |
c759c4e1 JB |
7494 | if (last_ptr->fragmented) { |
7495 | /* | |
7496 | * We still set window_start so we can keep track of the | |
7497 | * last place we found an allocation to try and save | |
7498 | * some time. | |
7499 | */ | |
7500 | hint_byte = last_ptr->window_start; | |
7501 | use_cluster = false; | |
7502 | } | |
fa9c0d79 | 7503 | spin_unlock(&last_ptr->lock); |
239b14b3 | 7504 | } |
fa9c0d79 | 7505 | |
2ff7e61e | 7506 | search_start = max(search_start, first_logical_byte(fs_info, 0)); |
239b14b3 | 7507 | search_start = max(search_start, hint_byte); |
2552d17e | 7508 | if (search_start == hint_byte) { |
0b246afa | 7509 | block_group = btrfs_lookup_block_group(fs_info, search_start); |
817d52f8 JB |
7510 | /* |
7511 | * we don't want to use the block group if it doesn't match our | |
7512 | * allocation bits, or if its not cached. | |
ccf0e725 JB |
7513 | * |
7514 | * However if we are re-searching with an ideal block group | |
7515 | * picked out then we don't care that the block group is cached. | |
817d52f8 | 7516 | */ |
b6919a58 | 7517 | if (block_group && block_group_bits(block_group, flags) && |
285ff5af | 7518 | block_group->cached != BTRFS_CACHE_NO) { |
2552d17e | 7519 | down_read(&space_info->groups_sem); |
44fb5511 CM |
7520 | if (list_empty(&block_group->list) || |
7521 | block_group->ro) { | |
7522 | /* | |
7523 | * someone is removing this block group, | |
7524 | * we can't jump into the have_block_group | |
7525 | * target because our list pointers are not | |
7526 | * valid | |
7527 | */ | |
7528 | btrfs_put_block_group(block_group); | |
7529 | up_read(&space_info->groups_sem); | |
ccf0e725 | 7530 | } else { |
3e72ee88 QW |
7531 | index = btrfs_bg_flags_to_raid_index( |
7532 | block_group->flags); | |
e570fd27 | 7533 | btrfs_lock_block_group(block_group, delalloc); |
44fb5511 | 7534 | goto have_block_group; |
ccf0e725 | 7535 | } |
2552d17e | 7536 | } else if (block_group) { |
fa9c0d79 | 7537 | btrfs_put_block_group(block_group); |
2552d17e | 7538 | } |
42e70e7a | 7539 | } |
2552d17e | 7540 | search: |
60d2adbb | 7541 | have_caching_bg = false; |
3e72ee88 | 7542 | if (index == 0 || index == btrfs_bg_flags_to_raid_index(flags)) |
a5e681d9 | 7543 | full_search = true; |
80eb234a | 7544 | down_read(&space_info->groups_sem); |
b742bb82 YZ |
7545 | list_for_each_entry(block_group, &space_info->block_groups[index], |
7546 | list) { | |
6226cb0a | 7547 | u64 offset; |
817d52f8 | 7548 | int cached; |
8a1413a2 | 7549 | |
14443937 JM |
7550 | /* If the block group is read-only, we can skip it entirely. */ |
7551 | if (unlikely(block_group->ro)) | |
7552 | continue; | |
7553 | ||
e570fd27 | 7554 | btrfs_grab_block_group(block_group, delalloc); |
2552d17e | 7555 | search_start = block_group->key.objectid; |
42e70e7a | 7556 | |
83a50de9 CM |
7557 | /* |
7558 | * this can happen if we end up cycling through all the | |
7559 | * raid types, but we want to make sure we only allocate | |
7560 | * for the proper type. | |
7561 | */ | |
b6919a58 | 7562 | if (!block_group_bits(block_group, flags)) { |
bece2e82 | 7563 | u64 extra = BTRFS_BLOCK_GROUP_DUP | |
83a50de9 | 7564 | BTRFS_BLOCK_GROUP_RAID1 | |
53b381b3 DW |
7565 | BTRFS_BLOCK_GROUP_RAID5 | |
7566 | BTRFS_BLOCK_GROUP_RAID6 | | |
83a50de9 CM |
7567 | BTRFS_BLOCK_GROUP_RAID10; |
7568 | ||
7569 | /* | |
7570 | * if they asked for extra copies and this block group | |
7571 | * doesn't provide them, bail. This does allow us to | |
7572 | * fill raid0 from raid1. | |
7573 | */ | |
b6919a58 | 7574 | if ((flags & extra) && !(block_group->flags & extra)) |
83a50de9 CM |
7575 | goto loop; |
7576 | } | |
7577 | ||
2552d17e | 7578 | have_block_group: |
291c7d2f JB |
7579 | cached = block_group_cache_done(block_group); |
7580 | if (unlikely(!cached)) { | |
a5e681d9 | 7581 | have_caching_bg = true; |
f6373bf3 | 7582 | ret = cache_block_group(block_group, 0); |
1d4284bd CM |
7583 | BUG_ON(ret < 0); |
7584 | ret = 0; | |
817d52f8 JB |
7585 | } |
7586 | ||
36cce922 JB |
7587 | if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) |
7588 | goto loop; | |
0f9dd46c | 7589 | |
0a24325e | 7590 | /* |
062c05c4 AO |
7591 | * Ok we want to try and use the cluster allocator, so |
7592 | * lets look there | |
0a24325e | 7593 | */ |
c759c4e1 | 7594 | if (last_ptr && use_cluster) { |
215a63d1 | 7595 | struct btrfs_block_group_cache *used_block_group; |
8de972b4 | 7596 | unsigned long aligned_cluster; |
fa9c0d79 CM |
7597 | /* |
7598 | * the refill lock keeps out other | |
7599 | * people trying to start a new cluster | |
7600 | */ | |
e570fd27 MX |
7601 | used_block_group = btrfs_lock_cluster(block_group, |
7602 | last_ptr, | |
7603 | delalloc); | |
7604 | if (!used_block_group) | |
44fb5511 | 7605 | goto refill_cluster; |
274bd4fb | 7606 | |
e570fd27 MX |
7607 | if (used_block_group != block_group && |
7608 | (used_block_group->ro || | |
7609 | !block_group_bits(used_block_group, flags))) | |
7610 | goto release_cluster; | |
44fb5511 | 7611 | |
274bd4fb | 7612 | offset = btrfs_alloc_from_cluster(used_block_group, |
a4820398 MX |
7613 | last_ptr, |
7614 | num_bytes, | |
7615 | used_block_group->key.objectid, | |
7616 | &max_extent_size); | |
fa9c0d79 CM |
7617 | if (offset) { |
7618 | /* we have a block, we're done */ | |
7619 | spin_unlock(&last_ptr->refill_lock); | |
3dca5c94 | 7620 | trace_btrfs_reserve_extent_cluster( |
89d4346a MX |
7621 | used_block_group, |
7622 | search_start, num_bytes); | |
215a63d1 | 7623 | if (used_block_group != block_group) { |
e570fd27 MX |
7624 | btrfs_release_block_group(block_group, |
7625 | delalloc); | |
215a63d1 MX |
7626 | block_group = used_block_group; |
7627 | } | |
fa9c0d79 CM |
7628 | goto checks; |
7629 | } | |
7630 | ||
274bd4fb | 7631 | WARN_ON(last_ptr->block_group != used_block_group); |
e570fd27 | 7632 | release_cluster: |
062c05c4 AO |
7633 | /* If we are on LOOP_NO_EMPTY_SIZE, we can't |
7634 | * set up a new clusters, so lets just skip it | |
7635 | * and let the allocator find whatever block | |
7636 | * it can find. If we reach this point, we | |
7637 | * will have tried the cluster allocator | |
7638 | * plenty of times and not have found | |
7639 | * anything, so we are likely way too | |
7640 | * fragmented for the clustering stuff to find | |
a5f6f719 AO |
7641 | * anything. |
7642 | * | |
7643 | * However, if the cluster is taken from the | |
7644 | * current block group, release the cluster | |
7645 | * first, so that we stand a better chance of | |
7646 | * succeeding in the unclustered | |
7647 | * allocation. */ | |
7648 | if (loop >= LOOP_NO_EMPTY_SIZE && | |
e570fd27 | 7649 | used_block_group != block_group) { |
062c05c4 | 7650 | spin_unlock(&last_ptr->refill_lock); |
e570fd27 MX |
7651 | btrfs_release_block_group(used_block_group, |
7652 | delalloc); | |
062c05c4 AO |
7653 | goto unclustered_alloc; |
7654 | } | |
7655 | ||
fa9c0d79 CM |
7656 | /* |
7657 | * this cluster didn't work out, free it and | |
7658 | * start over | |
7659 | */ | |
7660 | btrfs_return_cluster_to_free_space(NULL, last_ptr); | |
7661 | ||
e570fd27 MX |
7662 | if (used_block_group != block_group) |
7663 | btrfs_release_block_group(used_block_group, | |
7664 | delalloc); | |
7665 | refill_cluster: | |
a5f6f719 AO |
7666 | if (loop >= LOOP_NO_EMPTY_SIZE) { |
7667 | spin_unlock(&last_ptr->refill_lock); | |
7668 | goto unclustered_alloc; | |
7669 | } | |
7670 | ||
8de972b4 CM |
7671 | aligned_cluster = max_t(unsigned long, |
7672 | empty_cluster + empty_size, | |
7673 | block_group->full_stripe_len); | |
7674 | ||
fa9c0d79 | 7675 | /* allocate a cluster in this block group */ |
2ff7e61e | 7676 | ret = btrfs_find_space_cluster(fs_info, block_group, |
00361589 JB |
7677 | last_ptr, search_start, |
7678 | num_bytes, | |
7679 | aligned_cluster); | |
fa9c0d79 CM |
7680 | if (ret == 0) { |
7681 | /* | |
7682 | * now pull our allocation out of this | |
7683 | * cluster | |
7684 | */ | |
7685 | offset = btrfs_alloc_from_cluster(block_group, | |
a4820398 MX |
7686 | last_ptr, |
7687 | num_bytes, | |
7688 | search_start, | |
7689 | &max_extent_size); | |
fa9c0d79 CM |
7690 | if (offset) { |
7691 | /* we found one, proceed */ | |
7692 | spin_unlock(&last_ptr->refill_lock); | |
3dca5c94 | 7693 | trace_btrfs_reserve_extent_cluster( |
3f7de037 JB |
7694 | block_group, search_start, |
7695 | num_bytes); | |
fa9c0d79 CM |
7696 | goto checks; |
7697 | } | |
0a24325e JB |
7698 | } else if (!cached && loop > LOOP_CACHING_NOWAIT |
7699 | && !failed_cluster_refill) { | |
817d52f8 JB |
7700 | spin_unlock(&last_ptr->refill_lock); |
7701 | ||
0a24325e | 7702 | failed_cluster_refill = true; |
817d52f8 JB |
7703 | wait_block_group_cache_progress(block_group, |
7704 | num_bytes + empty_cluster + empty_size); | |
7705 | goto have_block_group; | |
fa9c0d79 | 7706 | } |
817d52f8 | 7707 | |
fa9c0d79 CM |
7708 | /* |
7709 | * at this point we either didn't find a cluster | |
7710 | * or we weren't able to allocate a block from our | |
7711 | * cluster. Free the cluster we've been trying | |
7712 | * to use, and go to the next block group | |
7713 | */ | |
0a24325e | 7714 | btrfs_return_cluster_to_free_space(NULL, last_ptr); |
fa9c0d79 | 7715 | spin_unlock(&last_ptr->refill_lock); |
0a24325e | 7716 | goto loop; |
fa9c0d79 CM |
7717 | } |
7718 | ||
062c05c4 | 7719 | unclustered_alloc: |
c759c4e1 JB |
7720 | /* |
7721 | * We are doing an unclustered alloc, set the fragmented flag so | |
7722 | * we don't bother trying to setup a cluster again until we get | |
7723 | * more space. | |
7724 | */ | |
7725 | if (unlikely(last_ptr)) { | |
7726 | spin_lock(&last_ptr->lock); | |
7727 | last_ptr->fragmented = 1; | |
7728 | spin_unlock(&last_ptr->lock); | |
7729 | } | |
0c9b36e0 LB |
7730 | if (cached) { |
7731 | struct btrfs_free_space_ctl *ctl = | |
7732 | block_group->free_space_ctl; | |
7733 | ||
7734 | spin_lock(&ctl->tree_lock); | |
7735 | if (ctl->free_space < | |
7736 | num_bytes + empty_cluster + empty_size) { | |
7737 | if (ctl->free_space > max_extent_size) | |
7738 | max_extent_size = ctl->free_space; | |
7739 | spin_unlock(&ctl->tree_lock); | |
7740 | goto loop; | |
7741 | } | |
7742 | spin_unlock(&ctl->tree_lock); | |
a5f6f719 | 7743 | } |
a5f6f719 | 7744 | |
6226cb0a | 7745 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
a4820398 MX |
7746 | num_bytes, empty_size, |
7747 | &max_extent_size); | |
1cdda9b8 JB |
7748 | /* |
7749 | * If we didn't find a chunk, and we haven't failed on this | |
7750 | * block group before, and this block group is in the middle of | |
7751 | * caching and we are ok with waiting, then go ahead and wait | |
7752 | * for progress to be made, and set failed_alloc to true. | |
7753 | * | |
7754 | * If failed_alloc is true then we've already waited on this | |
7755 | * block group once and should move on to the next block group. | |
7756 | */ | |
7757 | if (!offset && !failed_alloc && !cached && | |
7758 | loop > LOOP_CACHING_NOWAIT) { | |
817d52f8 | 7759 | wait_block_group_cache_progress(block_group, |
1cdda9b8 JB |
7760 | num_bytes + empty_size); |
7761 | failed_alloc = true; | |
817d52f8 | 7762 | goto have_block_group; |
1cdda9b8 JB |
7763 | } else if (!offset) { |
7764 | goto loop; | |
817d52f8 | 7765 | } |
fa9c0d79 | 7766 | checks: |
0b246afa | 7767 | search_start = ALIGN(offset, fs_info->stripesize); |
25179201 | 7768 | |
2552d17e JB |
7769 | /* move on to the next group */ |
7770 | if (search_start + num_bytes > | |
215a63d1 MX |
7771 | block_group->key.objectid + block_group->key.offset) { |
7772 | btrfs_add_free_space(block_group, offset, num_bytes); | |
2552d17e | 7773 | goto loop; |
6226cb0a | 7774 | } |
f5a31e16 | 7775 | |
f0486c68 | 7776 | if (offset < search_start) |
215a63d1 | 7777 | btrfs_add_free_space(block_group, offset, |
f0486c68 YZ |
7778 | search_start - offset); |
7779 | BUG_ON(offset > search_start); | |
2552d17e | 7780 | |
18513091 WX |
7781 | ret = btrfs_add_reserved_bytes(block_group, ram_bytes, |
7782 | num_bytes, delalloc); | |
f0486c68 | 7783 | if (ret == -EAGAIN) { |
215a63d1 | 7784 | btrfs_add_free_space(block_group, offset, num_bytes); |
2552d17e | 7785 | goto loop; |
0f9dd46c | 7786 | } |
9cfa3e34 | 7787 | btrfs_inc_block_group_reservations(block_group); |
0b86a832 | 7788 | |
f0486c68 | 7789 | /* we are all good, lets return */ |
2552d17e JB |
7790 | ins->objectid = search_start; |
7791 | ins->offset = num_bytes; | |
d2fb3437 | 7792 | |
3dca5c94 | 7793 | trace_btrfs_reserve_extent(block_group, search_start, num_bytes); |
e570fd27 | 7794 | btrfs_release_block_group(block_group, delalloc); |
2552d17e JB |
7795 | break; |
7796 | loop: | |
0a24325e | 7797 | failed_cluster_refill = false; |
1cdda9b8 | 7798 | failed_alloc = false; |
3e72ee88 QW |
7799 | BUG_ON(btrfs_bg_flags_to_raid_index(block_group->flags) != |
7800 | index); | |
e570fd27 | 7801 | btrfs_release_block_group(block_group, delalloc); |
14443937 | 7802 | cond_resched(); |
2552d17e JB |
7803 | } |
7804 | up_read(&space_info->groups_sem); | |
7805 | ||
13a0db5a | 7806 | if ((loop == LOOP_CACHING_NOWAIT) && have_caching_bg |
7807 | && !orig_have_caching_bg) | |
7808 | orig_have_caching_bg = true; | |
7809 | ||
60d2adbb MX |
7810 | if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg) |
7811 | goto search; | |
7812 | ||
b742bb82 YZ |
7813 | if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES) |
7814 | goto search; | |
7815 | ||
285ff5af | 7816 | /* |
ccf0e725 JB |
7817 | * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking |
7818 | * caching kthreads as we move along | |
817d52f8 JB |
7819 | * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching |
7820 | * LOOP_ALLOC_CHUNK, force a chunk allocation and try again | |
7821 | * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try | |
7822 | * again | |
fa9c0d79 | 7823 | */ |
723bda20 | 7824 | if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) { |
b742bb82 | 7825 | index = 0; |
a5e681d9 JB |
7826 | if (loop == LOOP_CACHING_NOWAIT) { |
7827 | /* | |
7828 | * We want to skip the LOOP_CACHING_WAIT step if we | |
01327610 | 7829 | * don't have any uncached bgs and we've already done a |
a5e681d9 JB |
7830 | * full search through. |
7831 | */ | |
13a0db5a | 7832 | if (orig_have_caching_bg || !full_search) |
a5e681d9 JB |
7833 | loop = LOOP_CACHING_WAIT; |
7834 | else | |
7835 | loop = LOOP_ALLOC_CHUNK; | |
7836 | } else { | |
7837 | loop++; | |
7838 | } | |
7839 | ||
817d52f8 | 7840 | if (loop == LOOP_ALLOC_CHUNK) { |
00361589 | 7841 | struct btrfs_trans_handle *trans; |
f017f15f WS |
7842 | int exist = 0; |
7843 | ||
7844 | trans = current->journal_info; | |
7845 | if (trans) | |
7846 | exist = 1; | |
7847 | else | |
7848 | trans = btrfs_join_transaction(root); | |
00361589 | 7849 | |
00361589 JB |
7850 | if (IS_ERR(trans)) { |
7851 | ret = PTR_ERR(trans); | |
7852 | goto out; | |
7853 | } | |
7854 | ||
2ff7e61e | 7855 | ret = do_chunk_alloc(trans, fs_info, flags, |
ea658bad | 7856 | CHUNK_ALLOC_FORCE); |
a5e681d9 JB |
7857 | |
7858 | /* | |
7859 | * If we can't allocate a new chunk we've already looped | |
7860 | * through at least once, move on to the NO_EMPTY_SIZE | |
7861 | * case. | |
7862 | */ | |
7863 | if (ret == -ENOSPC) | |
7864 | loop = LOOP_NO_EMPTY_SIZE; | |
7865 | ||
ea658bad JB |
7866 | /* |
7867 | * Do not bail out on ENOSPC since we | |
7868 | * can do more things. | |
7869 | */ | |
00361589 | 7870 | if (ret < 0 && ret != -ENOSPC) |
66642832 | 7871 | btrfs_abort_transaction(trans, ret); |
00361589 JB |
7872 | else |
7873 | ret = 0; | |
f017f15f | 7874 | if (!exist) |
3a45bb20 | 7875 | btrfs_end_transaction(trans); |
00361589 | 7876 | if (ret) |
ea658bad | 7877 | goto out; |
2552d17e JB |
7878 | } |
7879 | ||
723bda20 | 7880 | if (loop == LOOP_NO_EMPTY_SIZE) { |
a5e681d9 JB |
7881 | /* |
7882 | * Don't loop again if we already have no empty_size and | |
7883 | * no empty_cluster. | |
7884 | */ | |
7885 | if (empty_size == 0 && | |
7886 | empty_cluster == 0) { | |
7887 | ret = -ENOSPC; | |
7888 | goto out; | |
7889 | } | |
723bda20 JB |
7890 | empty_size = 0; |
7891 | empty_cluster = 0; | |
fa9c0d79 | 7892 | } |
723bda20 JB |
7893 | |
7894 | goto search; | |
2552d17e JB |
7895 | } else if (!ins->objectid) { |
7896 | ret = -ENOSPC; | |
d82a6f1d | 7897 | } else if (ins->objectid) { |
c759c4e1 JB |
7898 | if (!use_cluster && last_ptr) { |
7899 | spin_lock(&last_ptr->lock); | |
7900 | last_ptr->window_start = ins->objectid; | |
7901 | spin_unlock(&last_ptr->lock); | |
7902 | } | |
80eb234a | 7903 | ret = 0; |
be744175 | 7904 | } |
79787eaa | 7905 | out: |
4f4db217 JB |
7906 | if (ret == -ENOSPC) { |
7907 | spin_lock(&space_info->lock); | |
7908 | space_info->max_extent_size = max_extent_size; | |
7909 | spin_unlock(&space_info->lock); | |
a4820398 | 7910 | ins->offset = max_extent_size; |
4f4db217 | 7911 | } |
0f70abe2 | 7912 | return ret; |
fec577fb | 7913 | } |
ec44a35c | 7914 | |
ab8d0fc4 JM |
7915 | static void dump_space_info(struct btrfs_fs_info *fs_info, |
7916 | struct btrfs_space_info *info, u64 bytes, | |
9ed74f2d | 7917 | int dump_block_groups) |
0f9dd46c JB |
7918 | { |
7919 | struct btrfs_block_group_cache *cache; | |
b742bb82 | 7920 | int index = 0; |
0f9dd46c | 7921 | |
9ed74f2d | 7922 | spin_lock(&info->lock); |
ab8d0fc4 JM |
7923 | btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull", |
7924 | info->flags, | |
4136135b LB |
7925 | info->total_bytes - btrfs_space_info_used(info, true), |
7926 | info->full ? "" : "not "); | |
ab8d0fc4 JM |
7927 | btrfs_info(fs_info, |
7928 | "space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu", | |
7929 | info->total_bytes, info->bytes_used, info->bytes_pinned, | |
7930 | info->bytes_reserved, info->bytes_may_use, | |
7931 | info->bytes_readonly); | |
9ed74f2d JB |
7932 | spin_unlock(&info->lock); |
7933 | ||
7934 | if (!dump_block_groups) | |
7935 | return; | |
0f9dd46c | 7936 | |
80eb234a | 7937 | down_read(&info->groups_sem); |
b742bb82 YZ |
7938 | again: |
7939 | list_for_each_entry(cache, &info->block_groups[index], list) { | |
0f9dd46c | 7940 | spin_lock(&cache->lock); |
ab8d0fc4 JM |
7941 | btrfs_info(fs_info, |
7942 | "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s", | |
7943 | cache->key.objectid, cache->key.offset, | |
7944 | btrfs_block_group_used(&cache->item), cache->pinned, | |
7945 | cache->reserved, cache->ro ? "[readonly]" : ""); | |
0f9dd46c JB |
7946 | btrfs_dump_free_space(cache, bytes); |
7947 | spin_unlock(&cache->lock); | |
7948 | } | |
b742bb82 YZ |
7949 | if (++index < BTRFS_NR_RAID_TYPES) |
7950 | goto again; | |
80eb234a | 7951 | up_read(&info->groups_sem); |
0f9dd46c | 7952 | } |
e8569813 | 7953 | |
6f47c706 NB |
7954 | /* |
7955 | * btrfs_reserve_extent - entry point to the extent allocator. Tries to find a | |
7956 | * hole that is at least as big as @num_bytes. | |
7957 | * | |
7958 | * @root - The root that will contain this extent | |
7959 | * | |
7960 | * @ram_bytes - The amount of space in ram that @num_bytes take. This | |
7961 | * is used for accounting purposes. This value differs | |
7962 | * from @num_bytes only in the case of compressed extents. | |
7963 | * | |
7964 | * @num_bytes - Number of bytes to allocate on-disk. | |
7965 | * | |
7966 | * @min_alloc_size - Indicates the minimum amount of space that the | |
7967 | * allocator should try to satisfy. In some cases | |
7968 | * @num_bytes may be larger than what is required and if | |
7969 | * the filesystem is fragmented then allocation fails. | |
7970 | * However, the presence of @min_alloc_size gives a | |
7971 | * chance to try and satisfy the smaller allocation. | |
7972 | * | |
7973 | * @empty_size - A hint that you plan on doing more COW. This is the | |
7974 | * size in bytes the allocator should try to find free | |
7975 | * next to the block it returns. This is just a hint and | |
7976 | * may be ignored by the allocator. | |
7977 | * | |
7978 | * @hint_byte - Hint to the allocator to start searching above the byte | |
7979 | * address passed. It might be ignored. | |
7980 | * | |
7981 | * @ins - This key is modified to record the found hole. It will | |
7982 | * have the following values: | |
7983 | * ins->objectid == start position | |
7984 | * ins->flags = BTRFS_EXTENT_ITEM_KEY | |
7985 | * ins->offset == the size of the hole. | |
7986 | * | |
7987 | * @is_data - Boolean flag indicating whether an extent is | |
7988 | * allocated for data (true) or metadata (false) | |
7989 | * | |
7990 | * @delalloc - Boolean flag indicating whether this allocation is for | |
7991 | * delalloc or not. If 'true' data_rwsem of block groups | |
7992 | * is going to be acquired. | |
7993 | * | |
7994 | * | |
7995 | * Returns 0 when an allocation succeeded or < 0 when an error occurred. In | |
7996 | * case -ENOSPC is returned then @ins->offset will contain the size of the | |
7997 | * largest available hole the allocator managed to find. | |
7998 | */ | |
18513091 | 7999 | int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, |
11833d66 YZ |
8000 | u64 num_bytes, u64 min_alloc_size, |
8001 | u64 empty_size, u64 hint_byte, | |
e570fd27 | 8002 | struct btrfs_key *ins, int is_data, int delalloc) |
fec577fb | 8003 | { |
ab8d0fc4 | 8004 | struct btrfs_fs_info *fs_info = root->fs_info; |
36af4e07 | 8005 | bool final_tried = num_bytes == min_alloc_size; |
b6919a58 | 8006 | u64 flags; |
fec577fb | 8007 | int ret; |
925baedd | 8008 | |
1b86826d | 8009 | flags = get_alloc_profile_by_root(root, is_data); |
98d20f67 | 8010 | again: |
0b246afa | 8011 | WARN_ON(num_bytes < fs_info->sectorsize); |
87bde3cd | 8012 | ret = find_free_extent(fs_info, ram_bytes, num_bytes, empty_size, |
18513091 | 8013 | hint_byte, ins, flags, delalloc); |
9cfa3e34 | 8014 | if (!ret && !is_data) { |
ab8d0fc4 | 8015 | btrfs_dec_block_group_reservations(fs_info, ins->objectid); |
9cfa3e34 | 8016 | } else if (ret == -ENOSPC) { |
a4820398 MX |
8017 | if (!final_tried && ins->offset) { |
8018 | num_bytes = min(num_bytes >> 1, ins->offset); | |
da17066c | 8019 | num_bytes = round_down(num_bytes, |
0b246afa | 8020 | fs_info->sectorsize); |
9e622d6b | 8021 | num_bytes = max(num_bytes, min_alloc_size); |
18513091 | 8022 | ram_bytes = num_bytes; |
9e622d6b MX |
8023 | if (num_bytes == min_alloc_size) |
8024 | final_tried = true; | |
8025 | goto again; | |
ab8d0fc4 | 8026 | } else if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
9e622d6b MX |
8027 | struct btrfs_space_info *sinfo; |
8028 | ||
ab8d0fc4 | 8029 | sinfo = __find_space_info(fs_info, flags); |
0b246afa | 8030 | btrfs_err(fs_info, |
5d163e0e JM |
8031 | "allocation failed flags %llu, wanted %llu", |
8032 | flags, num_bytes); | |
53804280 | 8033 | if (sinfo) |
ab8d0fc4 | 8034 | dump_space_info(fs_info, sinfo, num_bytes, 1); |
9e622d6b | 8035 | } |
925baedd | 8036 | } |
0f9dd46c JB |
8037 | |
8038 | return ret; | |
e6dcd2dc CM |
8039 | } |
8040 | ||
2ff7e61e | 8041 | static int __btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, |
e570fd27 MX |
8042 | u64 start, u64 len, |
8043 | int pin, int delalloc) | |
65b51a00 | 8044 | { |
0f9dd46c | 8045 | struct btrfs_block_group_cache *cache; |
1f3c79a2 | 8046 | int ret = 0; |
0f9dd46c | 8047 | |
0b246afa | 8048 | cache = btrfs_lookup_block_group(fs_info, start); |
0f9dd46c | 8049 | if (!cache) { |
0b246afa JM |
8050 | btrfs_err(fs_info, "Unable to find block group for %llu", |
8051 | start); | |
0f9dd46c JB |
8052 | return -ENOSPC; |
8053 | } | |
1f3c79a2 | 8054 | |
e688b725 | 8055 | if (pin) |
2ff7e61e | 8056 | pin_down_extent(fs_info, cache, start, len, 1); |
e688b725 | 8057 | else { |
0b246afa | 8058 | if (btrfs_test_opt(fs_info, DISCARD)) |
2ff7e61e | 8059 | ret = btrfs_discard_extent(fs_info, start, len, NULL); |
e688b725 | 8060 | btrfs_add_free_space(cache, start, len); |
4824f1f4 | 8061 | btrfs_free_reserved_bytes(cache, len, delalloc); |
71ff6437 | 8062 | trace_btrfs_reserved_extent_free(fs_info, start, len); |
e688b725 | 8063 | } |
31193213 | 8064 | |
fa9c0d79 | 8065 | btrfs_put_block_group(cache); |
e6dcd2dc CM |
8066 | return ret; |
8067 | } | |
8068 | ||
2ff7e61e | 8069 | int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, |
e570fd27 | 8070 | u64 start, u64 len, int delalloc) |
e688b725 | 8071 | { |
2ff7e61e | 8072 | return __btrfs_free_reserved_extent(fs_info, start, len, 0, delalloc); |
e688b725 CM |
8073 | } |
8074 | ||
2ff7e61e | 8075 | int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info, |
e688b725 CM |
8076 | u64 start, u64 len) |
8077 | { | |
2ff7e61e | 8078 | return __btrfs_free_reserved_extent(fs_info, start, len, 1, 0); |
e688b725 CM |
8079 | } |
8080 | ||
5d4f98a2 | 8081 | static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
2ff7e61e | 8082 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
8083 | u64 parent, u64 root_objectid, |
8084 | u64 flags, u64 owner, u64 offset, | |
8085 | struct btrfs_key *ins, int ref_mod) | |
e6dcd2dc CM |
8086 | { |
8087 | int ret; | |
e6dcd2dc | 8088 | struct btrfs_extent_item *extent_item; |
5d4f98a2 | 8089 | struct btrfs_extent_inline_ref *iref; |
e6dcd2dc | 8090 | struct btrfs_path *path; |
5d4f98a2 YZ |
8091 | struct extent_buffer *leaf; |
8092 | int type; | |
8093 | u32 size; | |
26b8003f | 8094 | |
5d4f98a2 YZ |
8095 | if (parent > 0) |
8096 | type = BTRFS_SHARED_DATA_REF_KEY; | |
8097 | else | |
8098 | type = BTRFS_EXTENT_DATA_REF_KEY; | |
58176a96 | 8099 | |
5d4f98a2 | 8100 | size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type); |
7bb86316 CM |
8101 | |
8102 | path = btrfs_alloc_path(); | |
db5b493a TI |
8103 | if (!path) |
8104 | return -ENOMEM; | |
47e4bb98 | 8105 | |
b9473439 | 8106 | path->leave_spinning = 1; |
5d4f98a2 YZ |
8107 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, |
8108 | ins, size); | |
79787eaa JM |
8109 | if (ret) { |
8110 | btrfs_free_path(path); | |
8111 | return ret; | |
8112 | } | |
0f9dd46c | 8113 | |
5d4f98a2 YZ |
8114 | leaf = path->nodes[0]; |
8115 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
47e4bb98 | 8116 | struct btrfs_extent_item); |
5d4f98a2 YZ |
8117 | btrfs_set_extent_refs(leaf, extent_item, ref_mod); |
8118 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
8119 | btrfs_set_extent_flags(leaf, extent_item, | |
8120 | flags | BTRFS_EXTENT_FLAG_DATA); | |
8121 | ||
8122 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
8123 | btrfs_set_extent_inline_ref_type(leaf, iref, type); | |
8124 | if (parent > 0) { | |
8125 | struct btrfs_shared_data_ref *ref; | |
8126 | ref = (struct btrfs_shared_data_ref *)(iref + 1); | |
8127 | btrfs_set_extent_inline_ref_offset(leaf, iref, parent); | |
8128 | btrfs_set_shared_data_ref_count(leaf, ref, ref_mod); | |
8129 | } else { | |
8130 | struct btrfs_extent_data_ref *ref; | |
8131 | ref = (struct btrfs_extent_data_ref *)(&iref->offset); | |
8132 | btrfs_set_extent_data_ref_root(leaf, ref, root_objectid); | |
8133 | btrfs_set_extent_data_ref_objectid(leaf, ref, owner); | |
8134 | btrfs_set_extent_data_ref_offset(leaf, ref, offset); | |
8135 | btrfs_set_extent_data_ref_count(leaf, ref, ref_mod); | |
8136 | } | |
47e4bb98 CM |
8137 | |
8138 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
7bb86316 | 8139 | btrfs_free_path(path); |
f510cfec | 8140 | |
25a356d3 | 8141 | ret = remove_from_free_space_tree(trans, ins->objectid, ins->offset); |
1e144fb8 OS |
8142 | if (ret) |
8143 | return ret; | |
8144 | ||
6202df69 | 8145 | ret = update_block_group(trans, fs_info, ins->objectid, ins->offset, 1); |
79787eaa | 8146 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 8147 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
c1c9ff7c | 8148 | ins->objectid, ins->offset); |
f5947066 CM |
8149 | BUG(); |
8150 | } | |
71ff6437 | 8151 | trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid, ins->offset); |
e6dcd2dc CM |
8152 | return ret; |
8153 | } | |
8154 | ||
5d4f98a2 | 8155 | static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, |
4e6bd4e0 | 8156 | struct btrfs_delayed_ref_node *node, |
21ebfbe7 | 8157 | struct btrfs_delayed_extent_op *extent_op) |
e6dcd2dc | 8158 | { |
9dcdbe01 | 8159 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e6dcd2dc | 8160 | int ret; |
5d4f98a2 | 8161 | struct btrfs_extent_item *extent_item; |
4e6bd4e0 | 8162 | struct btrfs_key extent_key; |
5d4f98a2 YZ |
8163 | struct btrfs_tree_block_info *block_info; |
8164 | struct btrfs_extent_inline_ref *iref; | |
8165 | struct btrfs_path *path; | |
8166 | struct extent_buffer *leaf; | |
4e6bd4e0 | 8167 | struct btrfs_delayed_tree_ref *ref; |
3173a18f | 8168 | u32 size = sizeof(*extent_item) + sizeof(*iref); |
4e6bd4e0 | 8169 | u64 num_bytes; |
21ebfbe7 | 8170 | u64 flags = extent_op->flags_to_set; |
0b246afa | 8171 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); |
3173a18f | 8172 | |
4e6bd4e0 NB |
8173 | ref = btrfs_delayed_node_to_tree_ref(node); |
8174 | ||
4e6bd4e0 NB |
8175 | extent_key.objectid = node->bytenr; |
8176 | if (skinny_metadata) { | |
8177 | extent_key.offset = ref->level; | |
8178 | extent_key.type = BTRFS_METADATA_ITEM_KEY; | |
8179 | num_bytes = fs_info->nodesize; | |
8180 | } else { | |
8181 | extent_key.offset = node->num_bytes; | |
8182 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; | |
3173a18f | 8183 | size += sizeof(*block_info); |
4e6bd4e0 NB |
8184 | num_bytes = node->num_bytes; |
8185 | } | |
1c2308f8 | 8186 | |
5d4f98a2 | 8187 | path = btrfs_alloc_path(); |
857cc2fc | 8188 | if (!path) { |
4e6bd4e0 NB |
8189 | btrfs_free_and_pin_reserved_extent(fs_info, |
8190 | extent_key.objectid, | |
0b246afa | 8191 | fs_info->nodesize); |
d8926bb3 | 8192 | return -ENOMEM; |
857cc2fc | 8193 | } |
56bec294 | 8194 | |
5d4f98a2 YZ |
8195 | path->leave_spinning = 1; |
8196 | ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, | |
4e6bd4e0 | 8197 | &extent_key, size); |
79787eaa | 8198 | if (ret) { |
dd825259 | 8199 | btrfs_free_path(path); |
4e6bd4e0 NB |
8200 | btrfs_free_and_pin_reserved_extent(fs_info, |
8201 | extent_key.objectid, | |
0b246afa | 8202 | fs_info->nodesize); |
79787eaa JM |
8203 | return ret; |
8204 | } | |
5d4f98a2 YZ |
8205 | |
8206 | leaf = path->nodes[0]; | |
8207 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
8208 | struct btrfs_extent_item); | |
8209 | btrfs_set_extent_refs(leaf, extent_item, 1); | |
8210 | btrfs_set_extent_generation(leaf, extent_item, trans->transid); | |
8211 | btrfs_set_extent_flags(leaf, extent_item, | |
8212 | flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); | |
5d4f98a2 | 8213 | |
3173a18f JB |
8214 | if (skinny_metadata) { |
8215 | iref = (struct btrfs_extent_inline_ref *)(extent_item + 1); | |
8216 | } else { | |
8217 | block_info = (struct btrfs_tree_block_info *)(extent_item + 1); | |
21ebfbe7 | 8218 | btrfs_set_tree_block_key(leaf, block_info, &extent_op->key); |
4e6bd4e0 | 8219 | btrfs_set_tree_block_level(leaf, block_info, ref->level); |
3173a18f JB |
8220 | iref = (struct btrfs_extent_inline_ref *)(block_info + 1); |
8221 | } | |
5d4f98a2 | 8222 | |
d4b20733 | 8223 | if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) { |
5d4f98a2 YZ |
8224 | BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)); |
8225 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
8226 | BTRFS_SHARED_BLOCK_REF_KEY); | |
d4b20733 | 8227 | btrfs_set_extent_inline_ref_offset(leaf, iref, ref->parent); |
5d4f98a2 YZ |
8228 | } else { |
8229 | btrfs_set_extent_inline_ref_type(leaf, iref, | |
8230 | BTRFS_TREE_BLOCK_REF_KEY); | |
4e6bd4e0 | 8231 | btrfs_set_extent_inline_ref_offset(leaf, iref, ref->root); |
5d4f98a2 YZ |
8232 | } |
8233 | ||
8234 | btrfs_mark_buffer_dirty(leaf); | |
8235 | btrfs_free_path(path); | |
8236 | ||
4e6bd4e0 NB |
8237 | ret = remove_from_free_space_tree(trans, extent_key.objectid, |
8238 | num_bytes); | |
1e144fb8 OS |
8239 | if (ret) |
8240 | return ret; | |
8241 | ||
4e6bd4e0 | 8242 | ret = update_block_group(trans, fs_info, extent_key.objectid, |
6202df69 | 8243 | fs_info->nodesize, 1); |
79787eaa | 8244 | if (ret) { /* -ENOENT, logic error */ |
c2cf52eb | 8245 | btrfs_err(fs_info, "update block group failed for %llu %llu", |
4e6bd4e0 | 8246 | extent_key.objectid, extent_key.offset); |
5d4f98a2 YZ |
8247 | BUG(); |
8248 | } | |
0be5dc67 | 8249 | |
4e6bd4e0 | 8250 | trace_btrfs_reserved_extent_alloc(fs_info, extent_key.objectid, |
0b246afa | 8251 | fs_info->nodesize); |
5d4f98a2 YZ |
8252 | return ret; |
8253 | } | |
8254 | ||
8255 | int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, | |
84f7d8e6 | 8256 | struct btrfs_root *root, u64 owner, |
5846a3c2 QW |
8257 | u64 offset, u64 ram_bytes, |
8258 | struct btrfs_key *ins) | |
5d4f98a2 | 8259 | { |
84f7d8e6 | 8260 | struct btrfs_fs_info *fs_info = root->fs_info; |
5d4f98a2 YZ |
8261 | int ret; |
8262 | ||
84f7d8e6 | 8263 | BUG_ON(root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID); |
5d4f98a2 | 8264 | |
fd708b81 JB |
8265 | btrfs_ref_tree_mod(root, ins->objectid, ins->offset, 0, |
8266 | root->root_key.objectid, owner, offset, | |
8267 | BTRFS_ADD_DELAYED_EXTENT); | |
8268 | ||
0b246afa | 8269 | ret = btrfs_add_delayed_data_ref(fs_info, trans, ins->objectid, |
84f7d8e6 JB |
8270 | ins->offset, 0, |
8271 | root->root_key.objectid, owner, | |
7be07912 OS |
8272 | offset, ram_bytes, |
8273 | BTRFS_ADD_DELAYED_EXTENT, NULL, NULL); | |
e6dcd2dc CM |
8274 | return ret; |
8275 | } | |
e02119d5 CM |
8276 | |
8277 | /* | |
8278 | * this is used by the tree logging recovery code. It records that | |
8279 | * an extent has been allocated and makes sure to clear the free | |
8280 | * space cache bits as well | |
8281 | */ | |
5d4f98a2 | 8282 | int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
2ff7e61e | 8283 | struct btrfs_fs_info *fs_info, |
5d4f98a2 YZ |
8284 | u64 root_objectid, u64 owner, u64 offset, |
8285 | struct btrfs_key *ins) | |
e02119d5 CM |
8286 | { |
8287 | int ret; | |
8288 | struct btrfs_block_group_cache *block_group; | |
ed7a6948 | 8289 | struct btrfs_space_info *space_info; |
11833d66 | 8290 | |
8c2a1a30 JB |
8291 | /* |
8292 | * Mixed block groups will exclude before processing the log so we only | |
01327610 | 8293 | * need to do the exclude dance if this fs isn't mixed. |
8c2a1a30 | 8294 | */ |
0b246afa | 8295 | if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { |
2ff7e61e JM |
8296 | ret = __exclude_logged_extent(fs_info, ins->objectid, |
8297 | ins->offset); | |
b50c6e25 | 8298 | if (ret) |
8c2a1a30 | 8299 | return ret; |
11833d66 YZ |
8300 | } |
8301 | ||
0b246afa | 8302 | block_group = btrfs_lookup_block_group(fs_info, ins->objectid); |
8c2a1a30 JB |
8303 | if (!block_group) |
8304 | return -EINVAL; | |
8305 | ||
ed7a6948 WX |
8306 | space_info = block_group->space_info; |
8307 | spin_lock(&space_info->lock); | |
8308 | spin_lock(&block_group->lock); | |
8309 | space_info->bytes_reserved += ins->offset; | |
8310 | block_group->reserved += ins->offset; | |
8311 | spin_unlock(&block_group->lock); | |
8312 | spin_unlock(&space_info->lock); | |
8313 | ||
2ff7e61e | 8314 | ret = alloc_reserved_file_extent(trans, fs_info, 0, root_objectid, |
5d4f98a2 | 8315 | 0, owner, offset, ins, 1); |
b50c6e25 | 8316 | btrfs_put_block_group(block_group); |
e02119d5 CM |
8317 | return ret; |
8318 | } | |
8319 | ||
48a3b636 ES |
8320 | static struct extent_buffer * |
8321 | btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |
fe864576 | 8322 | u64 bytenr, int level) |
65b51a00 | 8323 | { |
0b246afa | 8324 | struct btrfs_fs_info *fs_info = root->fs_info; |
65b51a00 CM |
8325 | struct extent_buffer *buf; |
8326 | ||
2ff7e61e | 8327 | buf = btrfs_find_create_tree_block(fs_info, bytenr); |
c871b0f2 LB |
8328 | if (IS_ERR(buf)) |
8329 | return buf; | |
8330 | ||
65b51a00 | 8331 | btrfs_set_header_generation(buf, trans->transid); |
85d4e461 | 8332 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level); |
65b51a00 | 8333 | btrfs_tree_lock(buf); |
7c302b49 | 8334 | clean_tree_block(fs_info, buf); |
3083ee2e | 8335 | clear_bit(EXTENT_BUFFER_STALE, &buf->bflags); |
b4ce94de CM |
8336 | |
8337 | btrfs_set_lock_blocking(buf); | |
4db8c528 | 8338 | set_extent_buffer_uptodate(buf); |
b4ce94de | 8339 | |
d0c803c4 | 8340 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
656f30db | 8341 | buf->log_index = root->log_transid % 2; |
8cef4e16 YZ |
8342 | /* |
8343 | * we allow two log transactions at a time, use different | |
8344 | * EXENT bit to differentiate dirty pages. | |
8345 | */ | |
656f30db | 8346 | if (buf->log_index == 0) |
8cef4e16 YZ |
8347 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
8348 | buf->start + buf->len - 1, GFP_NOFS); | |
8349 | else | |
8350 | set_extent_new(&root->dirty_log_pages, buf->start, | |
3744dbeb | 8351 | buf->start + buf->len - 1); |
d0c803c4 | 8352 | } else { |
656f30db | 8353 | buf->log_index = -1; |
d0c803c4 | 8354 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
65b51a00 | 8355 | buf->start + buf->len - 1, GFP_NOFS); |
d0c803c4 | 8356 | } |
64c12921 | 8357 | trans->dirty = true; |
b4ce94de | 8358 | /* this returns a buffer locked for blocking */ |
65b51a00 CM |
8359 | return buf; |
8360 | } | |
8361 | ||
f0486c68 YZ |
8362 | static struct btrfs_block_rsv * |
8363 | use_block_rsv(struct btrfs_trans_handle *trans, | |
8364 | struct btrfs_root *root, u32 blocksize) | |
8365 | { | |
0b246afa | 8366 | struct btrfs_fs_info *fs_info = root->fs_info; |
f0486c68 | 8367 | struct btrfs_block_rsv *block_rsv; |
0b246afa | 8368 | struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; |
f0486c68 | 8369 | int ret; |
d88033db | 8370 | bool global_updated = false; |
f0486c68 YZ |
8371 | |
8372 | block_rsv = get_block_rsv(trans, root); | |
8373 | ||
b586b323 MX |
8374 | if (unlikely(block_rsv->size == 0)) |
8375 | goto try_reserve; | |
d88033db | 8376 | again: |
f0486c68 YZ |
8377 | ret = block_rsv_use_bytes(block_rsv, blocksize); |
8378 | if (!ret) | |
8379 | return block_rsv; | |
8380 | ||
b586b323 MX |
8381 | if (block_rsv->failfast) |
8382 | return ERR_PTR(ret); | |
8383 | ||
d88033db MX |
8384 | if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) { |
8385 | global_updated = true; | |
0b246afa | 8386 | update_global_block_rsv(fs_info); |
d88033db MX |
8387 | goto again; |
8388 | } | |
8389 | ||
0b246afa | 8390 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
b586b323 MX |
8391 | static DEFINE_RATELIMIT_STATE(_rs, |
8392 | DEFAULT_RATELIMIT_INTERVAL * 10, | |
8393 | /*DEFAULT_RATELIMIT_BURST*/ 1); | |
8394 | if (__ratelimit(&_rs)) | |
8395 | WARN(1, KERN_DEBUG | |
efe120a0 | 8396 | "BTRFS: block rsv returned %d\n", ret); |
b586b323 MX |
8397 | } |
8398 | try_reserve: | |
8399 | ret = reserve_metadata_bytes(root, block_rsv, blocksize, | |
8400 | BTRFS_RESERVE_NO_FLUSH); | |
8401 | if (!ret) | |
8402 | return block_rsv; | |
8403 | /* | |
8404 | * If we couldn't reserve metadata bytes try and use some from | |
5881cfc9 MX |
8405 | * the global reserve if its space type is the same as the global |
8406 | * reservation. | |
b586b323 | 8407 | */ |
5881cfc9 MX |
8408 | if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL && |
8409 | block_rsv->space_info == global_rsv->space_info) { | |
b586b323 MX |
8410 | ret = block_rsv_use_bytes(global_rsv, blocksize); |
8411 | if (!ret) | |
8412 | return global_rsv; | |
8413 | } | |
8414 | return ERR_PTR(ret); | |
f0486c68 YZ |
8415 | } |
8416 | ||
8c2a3ca2 JB |
8417 | static void unuse_block_rsv(struct btrfs_fs_info *fs_info, |
8418 | struct btrfs_block_rsv *block_rsv, u32 blocksize) | |
f0486c68 YZ |
8419 | { |
8420 | block_rsv_add_bytes(block_rsv, blocksize, 0); | |
ff6bc37e | 8421 | block_rsv_release_bytes(fs_info, block_rsv, NULL, 0, NULL); |
f0486c68 YZ |
8422 | } |
8423 | ||
fec577fb | 8424 | /* |
f0486c68 | 8425 | * finds a free extent and does all the dirty work required for allocation |
67b7859e | 8426 | * returns the tree buffer or an ERR_PTR on error. |
fec577fb | 8427 | */ |
4d75f8a9 | 8428 | struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, |
310712b2 OS |
8429 | struct btrfs_root *root, |
8430 | u64 parent, u64 root_objectid, | |
8431 | const struct btrfs_disk_key *key, | |
8432 | int level, u64 hint, | |
8433 | u64 empty_size) | |
fec577fb | 8434 | { |
0b246afa | 8435 | struct btrfs_fs_info *fs_info = root->fs_info; |
e2fa7227 | 8436 | struct btrfs_key ins; |
f0486c68 | 8437 | struct btrfs_block_rsv *block_rsv; |
5f39d397 | 8438 | struct extent_buffer *buf; |
67b7859e | 8439 | struct btrfs_delayed_extent_op *extent_op; |
f0486c68 YZ |
8440 | u64 flags = 0; |
8441 | int ret; | |
0b246afa JM |
8442 | u32 blocksize = fs_info->nodesize; |
8443 | bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA); | |
fec577fb | 8444 | |
05653ef3 | 8445 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
0b246afa | 8446 | if (btrfs_is_testing(fs_info)) { |
faa2dbf0 | 8447 | buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr, |
fe864576 | 8448 | level); |
faa2dbf0 JB |
8449 | if (!IS_ERR(buf)) |
8450 | root->alloc_bytenr += blocksize; | |
8451 | return buf; | |
8452 | } | |
05653ef3 | 8453 | #endif |
fccb84c9 | 8454 | |
f0486c68 YZ |
8455 | block_rsv = use_block_rsv(trans, root, blocksize); |
8456 | if (IS_ERR(block_rsv)) | |
8457 | return ERR_CAST(block_rsv); | |
8458 | ||
18513091 | 8459 | ret = btrfs_reserve_extent(root, blocksize, blocksize, blocksize, |
e570fd27 | 8460 | empty_size, hint, &ins, 0, 0); |
67b7859e OS |
8461 | if (ret) |
8462 | goto out_unuse; | |
55c69072 | 8463 | |
fe864576 | 8464 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, level); |
67b7859e OS |
8465 | if (IS_ERR(buf)) { |
8466 | ret = PTR_ERR(buf); | |
8467 | goto out_free_reserved; | |
8468 | } | |
f0486c68 YZ |
8469 | |
8470 | if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { | |
8471 | if (parent == 0) | |
8472 | parent = ins.objectid; | |
8473 | flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
8474 | } else | |
8475 | BUG_ON(parent > 0); | |
8476 | ||
8477 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { | |
78a6184a | 8478 | extent_op = btrfs_alloc_delayed_extent_op(); |
67b7859e OS |
8479 | if (!extent_op) { |
8480 | ret = -ENOMEM; | |
8481 | goto out_free_buf; | |
8482 | } | |
f0486c68 YZ |
8483 | if (key) |
8484 | memcpy(&extent_op->key, key, sizeof(extent_op->key)); | |
8485 | else | |
8486 | memset(&extent_op->key, 0, sizeof(extent_op->key)); | |
8487 | extent_op->flags_to_set = flags; | |
35b3ad50 DS |
8488 | extent_op->update_key = skinny_metadata ? false : true; |
8489 | extent_op->update_flags = true; | |
8490 | extent_op->is_data = false; | |
b1c79e09 | 8491 | extent_op->level = level; |
f0486c68 | 8492 | |
fd708b81 JB |
8493 | btrfs_ref_tree_mod(root, ins.objectid, ins.offset, parent, |
8494 | root_objectid, level, 0, | |
8495 | BTRFS_ADD_DELAYED_EXTENT); | |
7be07912 OS |
8496 | ret = btrfs_add_delayed_tree_ref(fs_info, trans, ins.objectid, |
8497 | ins.offset, parent, | |
8498 | root_objectid, level, | |
67b7859e | 8499 | BTRFS_ADD_DELAYED_EXTENT, |
7be07912 | 8500 | extent_op, NULL, NULL); |
67b7859e OS |
8501 | if (ret) |
8502 | goto out_free_delayed; | |
f0486c68 | 8503 | } |
fec577fb | 8504 | return buf; |
67b7859e OS |
8505 | |
8506 | out_free_delayed: | |
8507 | btrfs_free_delayed_extent_op(extent_op); | |
8508 | out_free_buf: | |
8509 | free_extent_buffer(buf); | |
8510 | out_free_reserved: | |
2ff7e61e | 8511 | btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 0); |
67b7859e | 8512 | out_unuse: |
0b246afa | 8513 | unuse_block_rsv(fs_info, block_rsv, blocksize); |
67b7859e | 8514 | return ERR_PTR(ret); |
fec577fb | 8515 | } |
a28ec197 | 8516 | |
2c47e605 YZ |
8517 | struct walk_control { |
8518 | u64 refs[BTRFS_MAX_LEVEL]; | |
8519 | u64 flags[BTRFS_MAX_LEVEL]; | |
8520 | struct btrfs_key update_progress; | |
8521 | int stage; | |
8522 | int level; | |
8523 | int shared_level; | |
8524 | int update_ref; | |
8525 | int keep_locks; | |
1c4850e2 YZ |
8526 | int reada_slot; |
8527 | int reada_count; | |
66d7e7f0 | 8528 | int for_reloc; |
2c47e605 YZ |
8529 | }; |
8530 | ||
8531 | #define DROP_REFERENCE 1 | |
8532 | #define UPDATE_BACKREF 2 | |
8533 | ||
1c4850e2 YZ |
8534 | static noinline void reada_walk_down(struct btrfs_trans_handle *trans, |
8535 | struct btrfs_root *root, | |
8536 | struct walk_control *wc, | |
8537 | struct btrfs_path *path) | |
6407bf6d | 8538 | { |
0b246afa | 8539 | struct btrfs_fs_info *fs_info = root->fs_info; |
1c4850e2 YZ |
8540 | u64 bytenr; |
8541 | u64 generation; | |
8542 | u64 refs; | |
94fcca9f | 8543 | u64 flags; |
5d4f98a2 | 8544 | u32 nritems; |
1c4850e2 YZ |
8545 | struct btrfs_key key; |
8546 | struct extent_buffer *eb; | |
6407bf6d | 8547 | int ret; |
1c4850e2 YZ |
8548 | int slot; |
8549 | int nread = 0; | |
6407bf6d | 8550 | |
1c4850e2 YZ |
8551 | if (path->slots[wc->level] < wc->reada_slot) { |
8552 | wc->reada_count = wc->reada_count * 2 / 3; | |
8553 | wc->reada_count = max(wc->reada_count, 2); | |
8554 | } else { | |
8555 | wc->reada_count = wc->reada_count * 3 / 2; | |
8556 | wc->reada_count = min_t(int, wc->reada_count, | |
0b246afa | 8557 | BTRFS_NODEPTRS_PER_BLOCK(fs_info)); |
1c4850e2 | 8558 | } |
7bb86316 | 8559 | |
1c4850e2 YZ |
8560 | eb = path->nodes[wc->level]; |
8561 | nritems = btrfs_header_nritems(eb); | |
bd56b302 | 8562 | |
1c4850e2 YZ |
8563 | for (slot = path->slots[wc->level]; slot < nritems; slot++) { |
8564 | if (nread >= wc->reada_count) | |
8565 | break; | |
bd56b302 | 8566 | |
2dd3e67b | 8567 | cond_resched(); |
1c4850e2 YZ |
8568 | bytenr = btrfs_node_blockptr(eb, slot); |
8569 | generation = btrfs_node_ptr_generation(eb, slot); | |
2dd3e67b | 8570 | |
1c4850e2 YZ |
8571 | if (slot == path->slots[wc->level]) |
8572 | goto reada; | |
5d4f98a2 | 8573 | |
1c4850e2 YZ |
8574 | if (wc->stage == UPDATE_BACKREF && |
8575 | generation <= root->root_key.offset) | |
bd56b302 CM |
8576 | continue; |
8577 | ||
94fcca9f | 8578 | /* We don't lock the tree block, it's OK to be racy here */ |
2ff7e61e | 8579 | ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, |
3173a18f JB |
8580 | wc->level - 1, 1, &refs, |
8581 | &flags); | |
79787eaa JM |
8582 | /* We don't care about errors in readahead. */ |
8583 | if (ret < 0) | |
8584 | continue; | |
94fcca9f YZ |
8585 | BUG_ON(refs == 0); |
8586 | ||
1c4850e2 | 8587 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 YZ |
8588 | if (refs == 1) |
8589 | goto reada; | |
bd56b302 | 8590 | |
94fcca9f YZ |
8591 | if (wc->level == 1 && |
8592 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8593 | continue; | |
1c4850e2 YZ |
8594 | if (!wc->update_ref || |
8595 | generation <= root->root_key.offset) | |
8596 | continue; | |
8597 | btrfs_node_key_to_cpu(eb, &key, slot); | |
8598 | ret = btrfs_comp_cpu_keys(&key, | |
8599 | &wc->update_progress); | |
8600 | if (ret < 0) | |
8601 | continue; | |
94fcca9f YZ |
8602 | } else { |
8603 | if (wc->level == 1 && | |
8604 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8605 | continue; | |
6407bf6d | 8606 | } |
1c4850e2 | 8607 | reada: |
2ff7e61e | 8608 | readahead_tree_block(fs_info, bytenr); |
1c4850e2 | 8609 | nread++; |
20524f02 | 8610 | } |
1c4850e2 | 8611 | wc->reada_slot = slot; |
20524f02 | 8612 | } |
2c47e605 | 8613 | |
f82d02d9 | 8614 | /* |
2c016dc2 | 8615 | * helper to process tree block while walking down the tree. |
2c47e605 | 8616 | * |
2c47e605 YZ |
8617 | * when wc->stage == UPDATE_BACKREF, this function updates |
8618 | * back refs for pointers in the block. | |
8619 | * | |
8620 | * NOTE: return value 1 means we should stop walking down. | |
f82d02d9 | 8621 | */ |
2c47e605 | 8622 | static noinline int walk_down_proc(struct btrfs_trans_handle *trans, |
5d4f98a2 | 8623 | struct btrfs_root *root, |
2c47e605 | 8624 | struct btrfs_path *path, |
94fcca9f | 8625 | struct walk_control *wc, int lookup_info) |
f82d02d9 | 8626 | { |
2ff7e61e | 8627 | struct btrfs_fs_info *fs_info = root->fs_info; |
2c47e605 YZ |
8628 | int level = wc->level; |
8629 | struct extent_buffer *eb = path->nodes[level]; | |
2c47e605 | 8630 | u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF; |
f82d02d9 YZ |
8631 | int ret; |
8632 | ||
2c47e605 YZ |
8633 | if (wc->stage == UPDATE_BACKREF && |
8634 | btrfs_header_owner(eb) != root->root_key.objectid) | |
8635 | return 1; | |
f82d02d9 | 8636 | |
2c47e605 YZ |
8637 | /* |
8638 | * when reference count of tree block is 1, it won't increase | |
8639 | * again. once full backref flag is set, we never clear it. | |
8640 | */ | |
94fcca9f YZ |
8641 | if (lookup_info && |
8642 | ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) || | |
8643 | (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) { | |
2c47e605 | 8644 | BUG_ON(!path->locks[level]); |
2ff7e61e | 8645 | ret = btrfs_lookup_extent_info(trans, fs_info, |
3173a18f | 8646 | eb->start, level, 1, |
2c47e605 YZ |
8647 | &wc->refs[level], |
8648 | &wc->flags[level]); | |
79787eaa JM |
8649 | BUG_ON(ret == -ENOMEM); |
8650 | if (ret) | |
8651 | return ret; | |
2c47e605 YZ |
8652 | BUG_ON(wc->refs[level] == 0); |
8653 | } | |
5d4f98a2 | 8654 | |
2c47e605 YZ |
8655 | if (wc->stage == DROP_REFERENCE) { |
8656 | if (wc->refs[level] > 1) | |
8657 | return 1; | |
f82d02d9 | 8658 | |
2c47e605 | 8659 | if (path->locks[level] && !wc->keep_locks) { |
bd681513 | 8660 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8661 | path->locks[level] = 0; |
8662 | } | |
8663 | return 0; | |
8664 | } | |
f82d02d9 | 8665 | |
2c47e605 YZ |
8666 | /* wc->stage == UPDATE_BACKREF */ |
8667 | if (!(wc->flags[level] & flag)) { | |
8668 | BUG_ON(!path->locks[level]); | |
e339a6b0 | 8669 | ret = btrfs_inc_ref(trans, root, eb, 1); |
79787eaa | 8670 | BUG_ON(ret); /* -ENOMEM */ |
e339a6b0 | 8671 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8672 | BUG_ON(ret); /* -ENOMEM */ |
2ff7e61e | 8673 | ret = btrfs_set_disk_extent_flags(trans, fs_info, eb->start, |
b1c79e09 JB |
8674 | eb->len, flag, |
8675 | btrfs_header_level(eb), 0); | |
79787eaa | 8676 | BUG_ON(ret); /* -ENOMEM */ |
2c47e605 YZ |
8677 | wc->flags[level] |= flag; |
8678 | } | |
8679 | ||
8680 | /* | |
8681 | * the block is shared by multiple trees, so it's not good to | |
8682 | * keep the tree lock | |
8683 | */ | |
8684 | if (path->locks[level] && level > 0) { | |
bd681513 | 8685 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
2c47e605 YZ |
8686 | path->locks[level] = 0; |
8687 | } | |
8688 | return 0; | |
8689 | } | |
8690 | ||
1c4850e2 | 8691 | /* |
2c016dc2 | 8692 | * helper to process tree block pointer. |
1c4850e2 YZ |
8693 | * |
8694 | * when wc->stage == DROP_REFERENCE, this function checks | |
8695 | * reference count of the block pointed to. if the block | |
8696 | * is shared and we need update back refs for the subtree | |
8697 | * rooted at the block, this function changes wc->stage to | |
8698 | * UPDATE_BACKREF. if the block is shared and there is no | |
8699 | * need to update back, this function drops the reference | |
8700 | * to the block. | |
8701 | * | |
8702 | * NOTE: return value 1 means we should stop walking down. | |
8703 | */ | |
8704 | static noinline int do_walk_down(struct btrfs_trans_handle *trans, | |
8705 | struct btrfs_root *root, | |
8706 | struct btrfs_path *path, | |
94fcca9f | 8707 | struct walk_control *wc, int *lookup_info) |
1c4850e2 | 8708 | { |
0b246afa | 8709 | struct btrfs_fs_info *fs_info = root->fs_info; |
1c4850e2 YZ |
8710 | u64 bytenr; |
8711 | u64 generation; | |
8712 | u64 parent; | |
8713 | u32 blocksize; | |
8714 | struct btrfs_key key; | |
581c1760 | 8715 | struct btrfs_key first_key; |
1c4850e2 YZ |
8716 | struct extent_buffer *next; |
8717 | int level = wc->level; | |
8718 | int reada = 0; | |
8719 | int ret = 0; | |
1152651a | 8720 | bool need_account = false; |
1c4850e2 YZ |
8721 | |
8722 | generation = btrfs_node_ptr_generation(path->nodes[level], | |
8723 | path->slots[level]); | |
8724 | /* | |
8725 | * if the lower level block was created before the snapshot | |
8726 | * was created, we know there is no need to update back refs | |
8727 | * for the subtree | |
8728 | */ | |
8729 | if (wc->stage == UPDATE_BACKREF && | |
94fcca9f YZ |
8730 | generation <= root->root_key.offset) { |
8731 | *lookup_info = 1; | |
1c4850e2 | 8732 | return 1; |
94fcca9f | 8733 | } |
1c4850e2 YZ |
8734 | |
8735 | bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]); | |
581c1760 QW |
8736 | btrfs_node_key_to_cpu(path->nodes[level], &first_key, |
8737 | path->slots[level]); | |
0b246afa | 8738 | blocksize = fs_info->nodesize; |
1c4850e2 | 8739 | |
0b246afa | 8740 | next = find_extent_buffer(fs_info, bytenr); |
1c4850e2 | 8741 | if (!next) { |
2ff7e61e | 8742 | next = btrfs_find_create_tree_block(fs_info, bytenr); |
c871b0f2 LB |
8743 | if (IS_ERR(next)) |
8744 | return PTR_ERR(next); | |
8745 | ||
b2aaaa3b JB |
8746 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, next, |
8747 | level - 1); | |
1c4850e2 YZ |
8748 | reada = 1; |
8749 | } | |
8750 | btrfs_tree_lock(next); | |
8751 | btrfs_set_lock_blocking(next); | |
8752 | ||
2ff7e61e | 8753 | ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, level - 1, 1, |
94fcca9f YZ |
8754 | &wc->refs[level - 1], |
8755 | &wc->flags[level - 1]); | |
4867268c JB |
8756 | if (ret < 0) |
8757 | goto out_unlock; | |
79787eaa | 8758 | |
c2cf52eb | 8759 | if (unlikely(wc->refs[level - 1] == 0)) { |
0b246afa | 8760 | btrfs_err(fs_info, "Missing references."); |
4867268c JB |
8761 | ret = -EIO; |
8762 | goto out_unlock; | |
c2cf52eb | 8763 | } |
94fcca9f | 8764 | *lookup_info = 0; |
1c4850e2 | 8765 | |
94fcca9f | 8766 | if (wc->stage == DROP_REFERENCE) { |
1c4850e2 | 8767 | if (wc->refs[level - 1] > 1) { |
1152651a | 8768 | need_account = true; |
94fcca9f YZ |
8769 | if (level == 1 && |
8770 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8771 | goto skip; | |
8772 | ||
1c4850e2 YZ |
8773 | if (!wc->update_ref || |
8774 | generation <= root->root_key.offset) | |
8775 | goto skip; | |
8776 | ||
8777 | btrfs_node_key_to_cpu(path->nodes[level], &key, | |
8778 | path->slots[level]); | |
8779 | ret = btrfs_comp_cpu_keys(&key, &wc->update_progress); | |
8780 | if (ret < 0) | |
8781 | goto skip; | |
8782 | ||
8783 | wc->stage = UPDATE_BACKREF; | |
8784 | wc->shared_level = level - 1; | |
8785 | } | |
94fcca9f YZ |
8786 | } else { |
8787 | if (level == 1 && | |
8788 | (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF)) | |
8789 | goto skip; | |
1c4850e2 YZ |
8790 | } |
8791 | ||
b9fab919 | 8792 | if (!btrfs_buffer_uptodate(next, generation, 0)) { |
1c4850e2 YZ |
8793 | btrfs_tree_unlock(next); |
8794 | free_extent_buffer(next); | |
8795 | next = NULL; | |
94fcca9f | 8796 | *lookup_info = 1; |
1c4850e2 YZ |
8797 | } |
8798 | ||
8799 | if (!next) { | |
8800 | if (reada && level == 1) | |
8801 | reada_walk_down(trans, root, wc, path); | |
581c1760 QW |
8802 | next = read_tree_block(fs_info, bytenr, generation, level - 1, |
8803 | &first_key); | |
64c043de LB |
8804 | if (IS_ERR(next)) { |
8805 | return PTR_ERR(next); | |
8806 | } else if (!extent_buffer_uptodate(next)) { | |
416bc658 | 8807 | free_extent_buffer(next); |
97d9a8a4 | 8808 | return -EIO; |
416bc658 | 8809 | } |
1c4850e2 YZ |
8810 | btrfs_tree_lock(next); |
8811 | btrfs_set_lock_blocking(next); | |
8812 | } | |
8813 | ||
8814 | level--; | |
4867268c JB |
8815 | ASSERT(level == btrfs_header_level(next)); |
8816 | if (level != btrfs_header_level(next)) { | |
8817 | btrfs_err(root->fs_info, "mismatched level"); | |
8818 | ret = -EIO; | |
8819 | goto out_unlock; | |
8820 | } | |
1c4850e2 YZ |
8821 | path->nodes[level] = next; |
8822 | path->slots[level] = 0; | |
bd681513 | 8823 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
1c4850e2 YZ |
8824 | wc->level = level; |
8825 | if (wc->level == 1) | |
8826 | wc->reada_slot = 0; | |
8827 | return 0; | |
8828 | skip: | |
8829 | wc->refs[level - 1] = 0; | |
8830 | wc->flags[level - 1] = 0; | |
94fcca9f YZ |
8831 | if (wc->stage == DROP_REFERENCE) { |
8832 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) { | |
8833 | parent = path->nodes[level]->start; | |
8834 | } else { | |
4867268c | 8835 | ASSERT(root->root_key.objectid == |
94fcca9f | 8836 | btrfs_header_owner(path->nodes[level])); |
4867268c JB |
8837 | if (root->root_key.objectid != |
8838 | btrfs_header_owner(path->nodes[level])) { | |
8839 | btrfs_err(root->fs_info, | |
8840 | "mismatched block owner"); | |
8841 | ret = -EIO; | |
8842 | goto out_unlock; | |
8843 | } | |
94fcca9f YZ |
8844 | parent = 0; |
8845 | } | |
1c4850e2 | 8846 | |
1152651a | 8847 | if (need_account) { |
33d1f05c QW |
8848 | ret = btrfs_qgroup_trace_subtree(trans, root, next, |
8849 | generation, level - 1); | |
1152651a | 8850 | if (ret) { |
0b246afa | 8851 | btrfs_err_rl(fs_info, |
5d163e0e JM |
8852 | "Error %d accounting shared subtree. Quota is out of sync, rescan required.", |
8853 | ret); | |
1152651a MF |
8854 | } |
8855 | } | |
84f7d8e6 | 8856 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
2ff7e61e JM |
8857 | parent, root->root_key.objectid, |
8858 | level - 1, 0); | |
4867268c JB |
8859 | if (ret) |
8860 | goto out_unlock; | |
1c4850e2 | 8861 | } |
4867268c JB |
8862 | |
8863 | *lookup_info = 1; | |
8864 | ret = 1; | |
8865 | ||
8866 | out_unlock: | |
1c4850e2 YZ |
8867 | btrfs_tree_unlock(next); |
8868 | free_extent_buffer(next); | |
4867268c JB |
8869 | |
8870 | return ret; | |
1c4850e2 YZ |
8871 | } |
8872 | ||
2c47e605 | 8873 | /* |
2c016dc2 | 8874 | * helper to process tree block while walking up the tree. |
2c47e605 YZ |
8875 | * |
8876 | * when wc->stage == DROP_REFERENCE, this function drops | |
8877 | * reference count on the block. | |
8878 | * | |
8879 | * when wc->stage == UPDATE_BACKREF, this function changes | |
8880 | * wc->stage back to DROP_REFERENCE if we changed wc->stage | |
8881 | * to UPDATE_BACKREF previously while processing the block. | |
8882 | * | |
8883 | * NOTE: return value 1 means we should stop walking up. | |
8884 | */ | |
8885 | static noinline int walk_up_proc(struct btrfs_trans_handle *trans, | |
8886 | struct btrfs_root *root, | |
8887 | struct btrfs_path *path, | |
8888 | struct walk_control *wc) | |
8889 | { | |
0b246afa | 8890 | struct btrfs_fs_info *fs_info = root->fs_info; |
f0486c68 | 8891 | int ret; |
2c47e605 YZ |
8892 | int level = wc->level; |
8893 | struct extent_buffer *eb = path->nodes[level]; | |
8894 | u64 parent = 0; | |
8895 | ||
8896 | if (wc->stage == UPDATE_BACKREF) { | |
8897 | BUG_ON(wc->shared_level < level); | |
8898 | if (level < wc->shared_level) | |
8899 | goto out; | |
8900 | ||
2c47e605 YZ |
8901 | ret = find_next_key(path, level + 1, &wc->update_progress); |
8902 | if (ret > 0) | |
8903 | wc->update_ref = 0; | |
8904 | ||
8905 | wc->stage = DROP_REFERENCE; | |
8906 | wc->shared_level = -1; | |
8907 | path->slots[level] = 0; | |
8908 | ||
8909 | /* | |
8910 | * check reference count again if the block isn't locked. | |
8911 | * we should start walking down the tree again if reference | |
8912 | * count is one. | |
8913 | */ | |
8914 | if (!path->locks[level]) { | |
8915 | BUG_ON(level == 0); | |
8916 | btrfs_tree_lock(eb); | |
8917 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8918 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 8919 | |
2ff7e61e | 8920 | ret = btrfs_lookup_extent_info(trans, fs_info, |
3173a18f | 8921 | eb->start, level, 1, |
2c47e605 YZ |
8922 | &wc->refs[level], |
8923 | &wc->flags[level]); | |
79787eaa JM |
8924 | if (ret < 0) { |
8925 | btrfs_tree_unlock_rw(eb, path->locks[level]); | |
3268a246 | 8926 | path->locks[level] = 0; |
79787eaa JM |
8927 | return ret; |
8928 | } | |
2c47e605 YZ |
8929 | BUG_ON(wc->refs[level] == 0); |
8930 | if (wc->refs[level] == 1) { | |
bd681513 | 8931 | btrfs_tree_unlock_rw(eb, path->locks[level]); |
3268a246 | 8932 | path->locks[level] = 0; |
2c47e605 YZ |
8933 | return 1; |
8934 | } | |
f82d02d9 | 8935 | } |
2c47e605 | 8936 | } |
f82d02d9 | 8937 | |
2c47e605 YZ |
8938 | /* wc->stage == DROP_REFERENCE */ |
8939 | BUG_ON(wc->refs[level] > 1 && !path->locks[level]); | |
5d4f98a2 | 8940 | |
2c47e605 YZ |
8941 | if (wc->refs[level] == 1) { |
8942 | if (level == 0) { | |
8943 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
e339a6b0 | 8944 | ret = btrfs_dec_ref(trans, root, eb, 1); |
2c47e605 | 8945 | else |
e339a6b0 | 8946 | ret = btrfs_dec_ref(trans, root, eb, 0); |
79787eaa | 8947 | BUG_ON(ret); /* -ENOMEM */ |
2ff7e61e | 8948 | ret = btrfs_qgroup_trace_leaf_items(trans, fs_info, eb); |
1152651a | 8949 | if (ret) { |
0b246afa | 8950 | btrfs_err_rl(fs_info, |
5d163e0e JM |
8951 | "error %d accounting leaf items. Quota is out of sync, rescan required.", |
8952 | ret); | |
1152651a | 8953 | } |
2c47e605 YZ |
8954 | } |
8955 | /* make block locked assertion in clean_tree_block happy */ | |
8956 | if (!path->locks[level] && | |
8957 | btrfs_header_generation(eb) == trans->transid) { | |
8958 | btrfs_tree_lock(eb); | |
8959 | btrfs_set_lock_blocking(eb); | |
bd681513 | 8960 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 8961 | } |
7c302b49 | 8962 | clean_tree_block(fs_info, eb); |
2c47e605 YZ |
8963 | } |
8964 | ||
8965 | if (eb == root->node) { | |
8966 | if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8967 | parent = eb->start; | |
8968 | else | |
8969 | BUG_ON(root->root_key.objectid != | |
8970 | btrfs_header_owner(eb)); | |
8971 | } else { | |
8972 | if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF) | |
8973 | parent = path->nodes[level + 1]->start; | |
8974 | else | |
8975 | BUG_ON(root->root_key.objectid != | |
8976 | btrfs_header_owner(path->nodes[level + 1])); | |
f82d02d9 | 8977 | } |
f82d02d9 | 8978 | |
5581a51a | 8979 | btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); |
2c47e605 YZ |
8980 | out: |
8981 | wc->refs[level] = 0; | |
8982 | wc->flags[level] = 0; | |
f0486c68 | 8983 | return 0; |
2c47e605 YZ |
8984 | } |
8985 | ||
8986 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, | |
8987 | struct btrfs_root *root, | |
8988 | struct btrfs_path *path, | |
8989 | struct walk_control *wc) | |
8990 | { | |
2c47e605 | 8991 | int level = wc->level; |
94fcca9f | 8992 | int lookup_info = 1; |
2c47e605 YZ |
8993 | int ret; |
8994 | ||
8995 | while (level >= 0) { | |
94fcca9f | 8996 | ret = walk_down_proc(trans, root, path, wc, lookup_info); |
2c47e605 YZ |
8997 | if (ret > 0) |
8998 | break; | |
8999 | ||
9000 | if (level == 0) | |
9001 | break; | |
9002 | ||
7a7965f8 YZ |
9003 | if (path->slots[level] >= |
9004 | btrfs_header_nritems(path->nodes[level])) | |
9005 | break; | |
9006 | ||
94fcca9f | 9007 | ret = do_walk_down(trans, root, path, wc, &lookup_info); |
1c4850e2 YZ |
9008 | if (ret > 0) { |
9009 | path->slots[level]++; | |
9010 | continue; | |
90d2c51d MX |
9011 | } else if (ret < 0) |
9012 | return ret; | |
1c4850e2 | 9013 | level = wc->level; |
f82d02d9 | 9014 | } |
f82d02d9 YZ |
9015 | return 0; |
9016 | } | |
9017 | ||
d397712b | 9018 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
98ed5174 | 9019 | struct btrfs_root *root, |
f82d02d9 | 9020 | struct btrfs_path *path, |
2c47e605 | 9021 | struct walk_control *wc, int max_level) |
20524f02 | 9022 | { |
2c47e605 | 9023 | int level = wc->level; |
20524f02 | 9024 | int ret; |
9f3a7427 | 9025 | |
2c47e605 YZ |
9026 | path->slots[level] = btrfs_header_nritems(path->nodes[level]); |
9027 | while (level < max_level && path->nodes[level]) { | |
9028 | wc->level = level; | |
9029 | if (path->slots[level] + 1 < | |
9030 | btrfs_header_nritems(path->nodes[level])) { | |
9031 | path->slots[level]++; | |
20524f02 CM |
9032 | return 0; |
9033 | } else { | |
2c47e605 YZ |
9034 | ret = walk_up_proc(trans, root, path, wc); |
9035 | if (ret > 0) | |
9036 | return 0; | |
bd56b302 | 9037 | |
2c47e605 | 9038 | if (path->locks[level]) { |
bd681513 CM |
9039 | btrfs_tree_unlock_rw(path->nodes[level], |
9040 | path->locks[level]); | |
2c47e605 | 9041 | path->locks[level] = 0; |
f82d02d9 | 9042 | } |
2c47e605 YZ |
9043 | free_extent_buffer(path->nodes[level]); |
9044 | path->nodes[level] = NULL; | |
9045 | level++; | |
20524f02 CM |
9046 | } |
9047 | } | |
9048 | return 1; | |
9049 | } | |
9050 | ||
9aca1d51 | 9051 | /* |
2c47e605 YZ |
9052 | * drop a subvolume tree. |
9053 | * | |
9054 | * this function traverses the tree freeing any blocks that only | |
9055 | * referenced by the tree. | |
9056 | * | |
9057 | * when a shared tree block is found. this function decreases its | |
9058 | * reference count by one. if update_ref is true, this function | |
9059 | * also make sure backrefs for the shared block and all lower level | |
9060 | * blocks are properly updated. | |
9d1a2a3a DS |
9061 | * |
9062 | * If called with for_reloc == 0, may exit early with -EAGAIN | |
9aca1d51 | 9063 | */ |
2c536799 | 9064 | int btrfs_drop_snapshot(struct btrfs_root *root, |
66d7e7f0 AJ |
9065 | struct btrfs_block_rsv *block_rsv, int update_ref, |
9066 | int for_reloc) | |
20524f02 | 9067 | { |
ab8d0fc4 | 9068 | struct btrfs_fs_info *fs_info = root->fs_info; |
5caf2a00 | 9069 | struct btrfs_path *path; |
2c47e605 | 9070 | struct btrfs_trans_handle *trans; |
ab8d0fc4 | 9071 | struct btrfs_root *tree_root = fs_info->tree_root; |
9f3a7427 | 9072 | struct btrfs_root_item *root_item = &root->root_item; |
2c47e605 YZ |
9073 | struct walk_control *wc; |
9074 | struct btrfs_key key; | |
9075 | int err = 0; | |
9076 | int ret; | |
9077 | int level; | |
d29a9f62 | 9078 | bool root_dropped = false; |
20524f02 | 9079 | |
ab8d0fc4 | 9080 | btrfs_debug(fs_info, "Drop subvolume %llu", root->objectid); |
1152651a | 9081 | |
5caf2a00 | 9082 | path = btrfs_alloc_path(); |
cb1b69f4 TI |
9083 | if (!path) { |
9084 | err = -ENOMEM; | |
9085 | goto out; | |
9086 | } | |
20524f02 | 9087 | |
2c47e605 | 9088 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
38a1a919 MF |
9089 | if (!wc) { |
9090 | btrfs_free_path(path); | |
cb1b69f4 TI |
9091 | err = -ENOMEM; |
9092 | goto out; | |
38a1a919 | 9093 | } |
2c47e605 | 9094 | |
a22285a6 | 9095 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
9096 | if (IS_ERR(trans)) { |
9097 | err = PTR_ERR(trans); | |
9098 | goto out_free; | |
9099 | } | |
98d5dc13 | 9100 | |
3fd0a558 YZ |
9101 | if (block_rsv) |
9102 | trans->block_rsv = block_rsv; | |
2c47e605 | 9103 | |
9f3a7427 | 9104 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2c47e605 | 9105 | level = btrfs_header_level(root->node); |
5d4f98a2 YZ |
9106 | path->nodes[level] = btrfs_lock_root_node(root); |
9107 | btrfs_set_lock_blocking(path->nodes[level]); | |
9f3a7427 | 9108 | path->slots[level] = 0; |
bd681513 | 9109 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
9110 | memset(&wc->update_progress, 0, |
9111 | sizeof(wc->update_progress)); | |
9f3a7427 | 9112 | } else { |
9f3a7427 | 9113 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
2c47e605 YZ |
9114 | memcpy(&wc->update_progress, &key, |
9115 | sizeof(wc->update_progress)); | |
9116 | ||
6702ed49 | 9117 | level = root_item->drop_level; |
2c47e605 | 9118 | BUG_ON(level == 0); |
6702ed49 | 9119 | path->lowest_level = level; |
2c47e605 YZ |
9120 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
9121 | path->lowest_level = 0; | |
9122 | if (ret < 0) { | |
9123 | err = ret; | |
79787eaa | 9124 | goto out_end_trans; |
9f3a7427 | 9125 | } |
1c4850e2 | 9126 | WARN_ON(ret > 0); |
2c47e605 | 9127 | |
7d9eb12c CM |
9128 | /* |
9129 | * unlock our path, this is safe because only this | |
9130 | * function is allowed to delete this snapshot | |
9131 | */ | |
5d4f98a2 | 9132 | btrfs_unlock_up_safe(path, 0); |
2c47e605 YZ |
9133 | |
9134 | level = btrfs_header_level(root->node); | |
9135 | while (1) { | |
9136 | btrfs_tree_lock(path->nodes[level]); | |
9137 | btrfs_set_lock_blocking(path->nodes[level]); | |
fec386ac | 9138 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 | 9139 | |
2ff7e61e | 9140 | ret = btrfs_lookup_extent_info(trans, fs_info, |
2c47e605 | 9141 | path->nodes[level]->start, |
3173a18f | 9142 | level, 1, &wc->refs[level], |
2c47e605 | 9143 | &wc->flags[level]); |
79787eaa JM |
9144 | if (ret < 0) { |
9145 | err = ret; | |
9146 | goto out_end_trans; | |
9147 | } | |
2c47e605 YZ |
9148 | BUG_ON(wc->refs[level] == 0); |
9149 | ||
9150 | if (level == root_item->drop_level) | |
9151 | break; | |
9152 | ||
9153 | btrfs_tree_unlock(path->nodes[level]); | |
fec386ac | 9154 | path->locks[level] = 0; |
2c47e605 YZ |
9155 | WARN_ON(wc->refs[level] != 1); |
9156 | level--; | |
9157 | } | |
9f3a7427 | 9158 | } |
2c47e605 YZ |
9159 | |
9160 | wc->level = level; | |
9161 | wc->shared_level = -1; | |
9162 | wc->stage = DROP_REFERENCE; | |
9163 | wc->update_ref = update_ref; | |
9164 | wc->keep_locks = 0; | |
66d7e7f0 | 9165 | wc->for_reloc = for_reloc; |
0b246afa | 9166 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info); |
2c47e605 | 9167 | |
d397712b | 9168 | while (1) { |
9d1a2a3a | 9169 | |
2c47e605 YZ |
9170 | ret = walk_down_tree(trans, root, path, wc); |
9171 | if (ret < 0) { | |
9172 | err = ret; | |
20524f02 | 9173 | break; |
2c47e605 | 9174 | } |
9aca1d51 | 9175 | |
2c47e605 YZ |
9176 | ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL); |
9177 | if (ret < 0) { | |
9178 | err = ret; | |
20524f02 | 9179 | break; |
2c47e605 YZ |
9180 | } |
9181 | ||
9182 | if (ret > 0) { | |
9183 | BUG_ON(wc->stage != DROP_REFERENCE); | |
e7a84565 CM |
9184 | break; |
9185 | } | |
2c47e605 YZ |
9186 | |
9187 | if (wc->stage == DROP_REFERENCE) { | |
9188 | level = wc->level; | |
9189 | btrfs_node_key(path->nodes[level], | |
9190 | &root_item->drop_progress, | |
9191 | path->slots[level]); | |
9192 | root_item->drop_level = level; | |
9193 | } | |
9194 | ||
9195 | BUG_ON(wc->level == 0); | |
3a45bb20 | 9196 | if (btrfs_should_end_transaction(trans) || |
2ff7e61e | 9197 | (!for_reloc && btrfs_need_cleaner_sleep(fs_info))) { |
2c47e605 YZ |
9198 | ret = btrfs_update_root(trans, tree_root, |
9199 | &root->root_key, | |
9200 | root_item); | |
79787eaa | 9201 | if (ret) { |
66642832 | 9202 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
9203 | err = ret; |
9204 | goto out_end_trans; | |
9205 | } | |
2c47e605 | 9206 | |
3a45bb20 | 9207 | btrfs_end_transaction_throttle(trans); |
2ff7e61e | 9208 | if (!for_reloc && btrfs_need_cleaner_sleep(fs_info)) { |
ab8d0fc4 JM |
9209 | btrfs_debug(fs_info, |
9210 | "drop snapshot early exit"); | |
3c8f2422 JB |
9211 | err = -EAGAIN; |
9212 | goto out_free; | |
9213 | } | |
9214 | ||
a22285a6 | 9215 | trans = btrfs_start_transaction(tree_root, 0); |
79787eaa JM |
9216 | if (IS_ERR(trans)) { |
9217 | err = PTR_ERR(trans); | |
9218 | goto out_free; | |
9219 | } | |
3fd0a558 YZ |
9220 | if (block_rsv) |
9221 | trans->block_rsv = block_rsv; | |
c3e69d58 | 9222 | } |
20524f02 | 9223 | } |
b3b4aa74 | 9224 | btrfs_release_path(path); |
79787eaa JM |
9225 | if (err) |
9226 | goto out_end_trans; | |
2c47e605 | 9227 | |
1cd5447e | 9228 | ret = btrfs_del_root(trans, fs_info, &root->root_key); |
79787eaa | 9229 | if (ret) { |
66642832 | 9230 | btrfs_abort_transaction(trans, ret); |
e19182c0 | 9231 | err = ret; |
79787eaa JM |
9232 | goto out_end_trans; |
9233 | } | |
2c47e605 | 9234 | |
76dda93c | 9235 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
cb517eab MX |
9236 | ret = btrfs_find_root(tree_root, &root->root_key, path, |
9237 | NULL, NULL); | |
79787eaa | 9238 | if (ret < 0) { |
66642832 | 9239 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
9240 | err = ret; |
9241 | goto out_end_trans; | |
9242 | } else if (ret > 0) { | |
84cd948c JB |
9243 | /* if we fail to delete the orphan item this time |
9244 | * around, it'll get picked up the next time. | |
9245 | * | |
9246 | * The most common failure here is just -ENOENT. | |
9247 | */ | |
9248 | btrfs_del_orphan_item(trans, tree_root, | |
9249 | root->root_key.objectid); | |
76dda93c YZ |
9250 | } |
9251 | } | |
9252 | ||
27cdeb70 | 9253 | if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) { |
2b9dbef2 | 9254 | btrfs_add_dropped_root(trans, root); |
76dda93c YZ |
9255 | } else { |
9256 | free_extent_buffer(root->node); | |
9257 | free_extent_buffer(root->commit_root); | |
b0feb9d9 | 9258 | btrfs_put_fs_root(root); |
76dda93c | 9259 | } |
d29a9f62 | 9260 | root_dropped = true; |
79787eaa | 9261 | out_end_trans: |
3a45bb20 | 9262 | btrfs_end_transaction_throttle(trans); |
79787eaa | 9263 | out_free: |
2c47e605 | 9264 | kfree(wc); |
5caf2a00 | 9265 | btrfs_free_path(path); |
cb1b69f4 | 9266 | out: |
d29a9f62 JB |
9267 | /* |
9268 | * So if we need to stop dropping the snapshot for whatever reason we | |
9269 | * need to make sure to add it back to the dead root list so that we | |
9270 | * keep trying to do the work later. This also cleans up roots if we | |
9271 | * don't have it in the radix (like when we recover after a power fail | |
9272 | * or unmount) so we don't leak memory. | |
9273 | */ | |
897ca819 | 9274 | if (!for_reloc && !root_dropped) |
d29a9f62 | 9275 | btrfs_add_dead_root(root); |
90515e7f | 9276 | if (err && err != -EAGAIN) |
ab8d0fc4 | 9277 | btrfs_handle_fs_error(fs_info, err, NULL); |
2c536799 | 9278 | return err; |
20524f02 | 9279 | } |
9078a3e1 | 9280 | |
2c47e605 YZ |
9281 | /* |
9282 | * drop subtree rooted at tree block 'node'. | |
9283 | * | |
9284 | * NOTE: this function will unlock and release tree block 'node' | |
66d7e7f0 | 9285 | * only used by relocation code |
2c47e605 | 9286 | */ |
f82d02d9 YZ |
9287 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
9288 | struct btrfs_root *root, | |
9289 | struct extent_buffer *node, | |
9290 | struct extent_buffer *parent) | |
9291 | { | |
0b246afa | 9292 | struct btrfs_fs_info *fs_info = root->fs_info; |
f82d02d9 | 9293 | struct btrfs_path *path; |
2c47e605 | 9294 | struct walk_control *wc; |
f82d02d9 YZ |
9295 | int level; |
9296 | int parent_level; | |
9297 | int ret = 0; | |
9298 | int wret; | |
9299 | ||
2c47e605 YZ |
9300 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
9301 | ||
f82d02d9 | 9302 | path = btrfs_alloc_path(); |
db5b493a TI |
9303 | if (!path) |
9304 | return -ENOMEM; | |
f82d02d9 | 9305 | |
2c47e605 | 9306 | wc = kzalloc(sizeof(*wc), GFP_NOFS); |
db5b493a TI |
9307 | if (!wc) { |
9308 | btrfs_free_path(path); | |
9309 | return -ENOMEM; | |
9310 | } | |
2c47e605 | 9311 | |
b9447ef8 | 9312 | btrfs_assert_tree_locked(parent); |
f82d02d9 YZ |
9313 | parent_level = btrfs_header_level(parent); |
9314 | extent_buffer_get(parent); | |
9315 | path->nodes[parent_level] = parent; | |
9316 | path->slots[parent_level] = btrfs_header_nritems(parent); | |
9317 | ||
b9447ef8 | 9318 | btrfs_assert_tree_locked(node); |
f82d02d9 | 9319 | level = btrfs_header_level(node); |
f82d02d9 YZ |
9320 | path->nodes[level] = node; |
9321 | path->slots[level] = 0; | |
bd681513 | 9322 | path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; |
2c47e605 YZ |
9323 | |
9324 | wc->refs[parent_level] = 1; | |
9325 | wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF; | |
9326 | wc->level = level; | |
9327 | wc->shared_level = -1; | |
9328 | wc->stage = DROP_REFERENCE; | |
9329 | wc->update_ref = 0; | |
9330 | wc->keep_locks = 1; | |
66d7e7f0 | 9331 | wc->for_reloc = 1; |
0b246afa | 9332 | wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info); |
f82d02d9 YZ |
9333 | |
9334 | while (1) { | |
2c47e605 YZ |
9335 | wret = walk_down_tree(trans, root, path, wc); |
9336 | if (wret < 0) { | |
f82d02d9 | 9337 | ret = wret; |
f82d02d9 | 9338 | break; |
2c47e605 | 9339 | } |
f82d02d9 | 9340 | |
2c47e605 | 9341 | wret = walk_up_tree(trans, root, path, wc, parent_level); |
f82d02d9 YZ |
9342 | if (wret < 0) |
9343 | ret = wret; | |
9344 | if (wret != 0) | |
9345 | break; | |
9346 | } | |
9347 | ||
2c47e605 | 9348 | kfree(wc); |
f82d02d9 YZ |
9349 | btrfs_free_path(path); |
9350 | return ret; | |
9351 | } | |
9352 | ||
6202df69 | 9353 | static u64 update_block_group_flags(struct btrfs_fs_info *fs_info, u64 flags) |
ec44a35c CM |
9354 | { |
9355 | u64 num_devices; | |
fc67c450 | 9356 | u64 stripped; |
e4d8ec0f | 9357 | |
fc67c450 ID |
9358 | /* |
9359 | * if restripe for this chunk_type is on pick target profile and | |
9360 | * return, otherwise do the usual balance | |
9361 | */ | |
6202df69 | 9362 | stripped = get_restripe_target(fs_info, flags); |
fc67c450 ID |
9363 | if (stripped) |
9364 | return extended_to_chunk(stripped); | |
e4d8ec0f | 9365 | |
6202df69 | 9366 | num_devices = fs_info->fs_devices->rw_devices; |
cd02dca5 | 9367 | |
fc67c450 | 9368 | stripped = BTRFS_BLOCK_GROUP_RAID0 | |
53b381b3 | 9369 | BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 | |
fc67c450 ID |
9370 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
9371 | ||
ec44a35c CM |
9372 | if (num_devices == 1) { |
9373 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
9374 | stripped = flags & ~stripped; | |
9375 | ||
9376 | /* turn raid0 into single device chunks */ | |
9377 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
9378 | return stripped; | |
9379 | ||
9380 | /* turn mirroring into duplication */ | |
9381 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
9382 | BTRFS_BLOCK_GROUP_RAID10)) | |
9383 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
ec44a35c CM |
9384 | } else { |
9385 | /* they already had raid on here, just return */ | |
ec44a35c CM |
9386 | if (flags & stripped) |
9387 | return flags; | |
9388 | ||
9389 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
9390 | stripped = flags & ~stripped; | |
9391 | ||
9392 | /* switch duplicated blocks with raid1 */ | |
9393 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
9394 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
9395 | ||
e3176ca2 | 9396 | /* this is drive concat, leave it alone */ |
ec44a35c | 9397 | } |
e3176ca2 | 9398 | |
ec44a35c CM |
9399 | return flags; |
9400 | } | |
9401 | ||
868f401a | 9402 | static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force) |
0ef3e66b | 9403 | { |
f0486c68 YZ |
9404 | struct btrfs_space_info *sinfo = cache->space_info; |
9405 | u64 num_bytes; | |
199c36ea | 9406 | u64 min_allocable_bytes; |
f0486c68 | 9407 | int ret = -ENOSPC; |
0ef3e66b | 9408 | |
199c36ea MX |
9409 | /* |
9410 | * We need some metadata space and system metadata space for | |
9411 | * allocating chunks in some corner cases until we force to set | |
9412 | * it to be readonly. | |
9413 | */ | |
9414 | if ((sinfo->flags & | |
9415 | (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) && | |
9416 | !force) | |
ee22184b | 9417 | min_allocable_bytes = SZ_1M; |
199c36ea MX |
9418 | else |
9419 | min_allocable_bytes = 0; | |
9420 | ||
f0486c68 YZ |
9421 | spin_lock(&sinfo->lock); |
9422 | spin_lock(&cache->lock); | |
61cfea9b W |
9423 | |
9424 | if (cache->ro) { | |
868f401a | 9425 | cache->ro++; |
61cfea9b W |
9426 | ret = 0; |
9427 | goto out; | |
9428 | } | |
9429 | ||
f0486c68 YZ |
9430 | num_bytes = cache->key.offset - cache->reserved - cache->pinned - |
9431 | cache->bytes_super - btrfs_block_group_used(&cache->item); | |
9432 | ||
4136135b | 9433 | if (btrfs_space_info_used(sinfo, true) + num_bytes + |
37be25bc | 9434 | min_allocable_bytes <= sinfo->total_bytes) { |
f0486c68 | 9435 | sinfo->bytes_readonly += num_bytes; |
868f401a | 9436 | cache->ro++; |
633c0aad | 9437 | list_add_tail(&cache->ro_list, &sinfo->ro_bgs); |
f0486c68 YZ |
9438 | ret = 0; |
9439 | } | |
61cfea9b | 9440 | out: |
f0486c68 YZ |
9441 | spin_unlock(&cache->lock); |
9442 | spin_unlock(&sinfo->lock); | |
9443 | return ret; | |
9444 | } | |
7d9eb12c | 9445 | |
5e00f193 | 9446 | int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info, |
f0486c68 | 9447 | struct btrfs_block_group_cache *cache) |
c286ac48 | 9448 | |
f0486c68 YZ |
9449 | { |
9450 | struct btrfs_trans_handle *trans; | |
9451 | u64 alloc_flags; | |
9452 | int ret; | |
7d9eb12c | 9453 | |
1bbc621e | 9454 | again: |
5e00f193 | 9455 | trans = btrfs_join_transaction(fs_info->extent_root); |
79787eaa JM |
9456 | if (IS_ERR(trans)) |
9457 | return PTR_ERR(trans); | |
5d4f98a2 | 9458 | |
1bbc621e CM |
9459 | /* |
9460 | * we're not allowed to set block groups readonly after the dirty | |
9461 | * block groups cache has started writing. If it already started, | |
9462 | * back off and let this transaction commit | |
9463 | */ | |
0b246afa | 9464 | mutex_lock(&fs_info->ro_block_group_mutex); |
3204d33c | 9465 | if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) { |
1bbc621e CM |
9466 | u64 transid = trans->transid; |
9467 | ||
0b246afa | 9468 | mutex_unlock(&fs_info->ro_block_group_mutex); |
3a45bb20 | 9469 | btrfs_end_transaction(trans); |
1bbc621e | 9470 | |
2ff7e61e | 9471 | ret = btrfs_wait_for_commit(fs_info, transid); |
1bbc621e CM |
9472 | if (ret) |
9473 | return ret; | |
9474 | goto again; | |
9475 | } | |
9476 | ||
153c35b6 CM |
9477 | /* |
9478 | * if we are changing raid levels, try to allocate a corresponding | |
9479 | * block group with the new raid level. | |
9480 | */ | |
0b246afa | 9481 | alloc_flags = update_block_group_flags(fs_info, cache->flags); |
153c35b6 | 9482 | if (alloc_flags != cache->flags) { |
2ff7e61e | 9483 | ret = do_chunk_alloc(trans, fs_info, alloc_flags, |
153c35b6 CM |
9484 | CHUNK_ALLOC_FORCE); |
9485 | /* | |
9486 | * ENOSPC is allowed here, we may have enough space | |
9487 | * already allocated at the new raid level to | |
9488 | * carry on | |
9489 | */ | |
9490 | if (ret == -ENOSPC) | |
9491 | ret = 0; | |
9492 | if (ret < 0) | |
9493 | goto out; | |
9494 | } | |
1bbc621e | 9495 | |
868f401a | 9496 | ret = inc_block_group_ro(cache, 0); |
f0486c68 YZ |
9497 | if (!ret) |
9498 | goto out; | |
2ff7e61e JM |
9499 | alloc_flags = get_alloc_profile(fs_info, cache->space_info->flags); |
9500 | ret = do_chunk_alloc(trans, fs_info, alloc_flags, | |
0e4f8f88 | 9501 | CHUNK_ALLOC_FORCE); |
f0486c68 YZ |
9502 | if (ret < 0) |
9503 | goto out; | |
868f401a | 9504 | ret = inc_block_group_ro(cache, 0); |
f0486c68 | 9505 | out: |
2f081088 | 9506 | if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
0b246afa | 9507 | alloc_flags = update_block_group_flags(fs_info, cache->flags); |
34441361 | 9508 | mutex_lock(&fs_info->chunk_mutex); |
2ff7e61e | 9509 | check_system_chunk(trans, fs_info, alloc_flags); |
34441361 | 9510 | mutex_unlock(&fs_info->chunk_mutex); |
2f081088 | 9511 | } |
0b246afa | 9512 | mutex_unlock(&fs_info->ro_block_group_mutex); |
2f081088 | 9513 | |
3a45bb20 | 9514 | btrfs_end_transaction(trans); |
f0486c68 YZ |
9515 | return ret; |
9516 | } | |
5d4f98a2 | 9517 | |
c87f08ca | 9518 | int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
2ff7e61e | 9519 | struct btrfs_fs_info *fs_info, u64 type) |
c87f08ca | 9520 | { |
2ff7e61e JM |
9521 | u64 alloc_flags = get_alloc_profile(fs_info, type); |
9522 | ||
9523 | return do_chunk_alloc(trans, fs_info, alloc_flags, CHUNK_ALLOC_FORCE); | |
c87f08ca CM |
9524 | } |
9525 | ||
6d07bcec MX |
9526 | /* |
9527 | * helper to account the unused space of all the readonly block group in the | |
633c0aad | 9528 | * space_info. takes mirrors into account. |
6d07bcec | 9529 | */ |
633c0aad | 9530 | u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) |
6d07bcec MX |
9531 | { |
9532 | struct btrfs_block_group_cache *block_group; | |
9533 | u64 free_bytes = 0; | |
9534 | int factor; | |
9535 | ||
01327610 | 9536 | /* It's df, we don't care if it's racy */ |
633c0aad JB |
9537 | if (list_empty(&sinfo->ro_bgs)) |
9538 | return 0; | |
9539 | ||
9540 | spin_lock(&sinfo->lock); | |
9541 | list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { | |
6d07bcec MX |
9542 | spin_lock(&block_group->lock); |
9543 | ||
9544 | if (!block_group->ro) { | |
9545 | spin_unlock(&block_group->lock); | |
9546 | continue; | |
9547 | } | |
9548 | ||
9549 | if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
9550 | BTRFS_BLOCK_GROUP_RAID10 | | |
9551 | BTRFS_BLOCK_GROUP_DUP)) | |
9552 | factor = 2; | |
9553 | else | |
9554 | factor = 1; | |
9555 | ||
9556 | free_bytes += (block_group->key.offset - | |
9557 | btrfs_block_group_used(&block_group->item)) * | |
9558 | factor; | |
9559 | ||
9560 | spin_unlock(&block_group->lock); | |
9561 | } | |
6d07bcec MX |
9562 | spin_unlock(&sinfo->lock); |
9563 | ||
9564 | return free_bytes; | |
9565 | } | |
9566 | ||
2ff7e61e | 9567 | void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache) |
5d4f98a2 | 9568 | { |
f0486c68 YZ |
9569 | struct btrfs_space_info *sinfo = cache->space_info; |
9570 | u64 num_bytes; | |
9571 | ||
9572 | BUG_ON(!cache->ro); | |
9573 | ||
9574 | spin_lock(&sinfo->lock); | |
9575 | spin_lock(&cache->lock); | |
868f401a Z |
9576 | if (!--cache->ro) { |
9577 | num_bytes = cache->key.offset - cache->reserved - | |
9578 | cache->pinned - cache->bytes_super - | |
9579 | btrfs_block_group_used(&cache->item); | |
9580 | sinfo->bytes_readonly -= num_bytes; | |
9581 | list_del_init(&cache->ro_list); | |
9582 | } | |
f0486c68 YZ |
9583 | spin_unlock(&cache->lock); |
9584 | spin_unlock(&sinfo->lock); | |
5d4f98a2 YZ |
9585 | } |
9586 | ||
ba1bf481 JB |
9587 | /* |
9588 | * checks to see if its even possible to relocate this block group. | |
9589 | * | |
9590 | * @return - -1 if it's not a good idea to relocate this block group, 0 if its | |
9591 | * ok to go ahead and try. | |
9592 | */ | |
6bccf3ab | 9593 | int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr) |
1a40e23b | 9594 | { |
6bccf3ab | 9595 | struct btrfs_root *root = fs_info->extent_root; |
ba1bf481 JB |
9596 | struct btrfs_block_group_cache *block_group; |
9597 | struct btrfs_space_info *space_info; | |
0b246afa | 9598 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
ba1bf481 | 9599 | struct btrfs_device *device; |
6df9a95e | 9600 | struct btrfs_trans_handle *trans; |
cdcb725c | 9601 | u64 min_free; |
6719db6a JB |
9602 | u64 dev_min = 1; |
9603 | u64 dev_nr = 0; | |
4a5e98f5 | 9604 | u64 target; |
0305bc27 | 9605 | int debug; |
cdcb725c | 9606 | int index; |
ba1bf481 JB |
9607 | int full = 0; |
9608 | int ret = 0; | |
1a40e23b | 9609 | |
0b246afa | 9610 | debug = btrfs_test_opt(fs_info, ENOSPC_DEBUG); |
0305bc27 | 9611 | |
0b246afa | 9612 | block_group = btrfs_lookup_block_group(fs_info, bytenr); |
1a40e23b | 9613 | |
ba1bf481 | 9614 | /* odd, couldn't find the block group, leave it alone */ |
0305bc27 QW |
9615 | if (!block_group) { |
9616 | if (debug) | |
0b246afa | 9617 | btrfs_warn(fs_info, |
0305bc27 QW |
9618 | "can't find block group for bytenr %llu", |
9619 | bytenr); | |
ba1bf481 | 9620 | return -1; |
0305bc27 | 9621 | } |
1a40e23b | 9622 | |
cdcb725c | 9623 | min_free = btrfs_block_group_used(&block_group->item); |
9624 | ||
ba1bf481 | 9625 | /* no bytes used, we're good */ |
cdcb725c | 9626 | if (!min_free) |
1a40e23b ZY |
9627 | goto out; |
9628 | ||
ba1bf481 JB |
9629 | space_info = block_group->space_info; |
9630 | spin_lock(&space_info->lock); | |
17d217fe | 9631 | |
ba1bf481 | 9632 | full = space_info->full; |
17d217fe | 9633 | |
ba1bf481 JB |
9634 | /* |
9635 | * if this is the last block group we have in this space, we can't | |
7ce618db CM |
9636 | * relocate it unless we're able to allocate a new chunk below. |
9637 | * | |
9638 | * Otherwise, we need to make sure we have room in the space to handle | |
9639 | * all of the extents from this block group. If we can, we're good | |
ba1bf481 | 9640 | */ |
7ce618db | 9641 | if ((space_info->total_bytes != block_group->key.offset) && |
4136135b LB |
9642 | (btrfs_space_info_used(space_info, false) + min_free < |
9643 | space_info->total_bytes)) { | |
ba1bf481 JB |
9644 | spin_unlock(&space_info->lock); |
9645 | goto out; | |
17d217fe | 9646 | } |
ba1bf481 | 9647 | spin_unlock(&space_info->lock); |
ea8c2819 | 9648 | |
ba1bf481 JB |
9649 | /* |
9650 | * ok we don't have enough space, but maybe we have free space on our | |
9651 | * devices to allocate new chunks for relocation, so loop through our | |
4a5e98f5 ID |
9652 | * alloc devices and guess if we have enough space. if this block |
9653 | * group is going to be restriped, run checks against the target | |
9654 | * profile instead of the current one. | |
ba1bf481 JB |
9655 | */ |
9656 | ret = -1; | |
ea8c2819 | 9657 | |
cdcb725c | 9658 | /* |
9659 | * index: | |
9660 | * 0: raid10 | |
9661 | * 1: raid1 | |
9662 | * 2: dup | |
9663 | * 3: raid0 | |
9664 | * 4: single | |
9665 | */ | |
0b246afa | 9666 | target = get_restripe_target(fs_info, block_group->flags); |
4a5e98f5 | 9667 | if (target) { |
3e72ee88 | 9668 | index = btrfs_bg_flags_to_raid_index(extended_to_chunk(target)); |
4a5e98f5 ID |
9669 | } else { |
9670 | /* | |
9671 | * this is just a balance, so if we were marked as full | |
9672 | * we know there is no space for a new chunk | |
9673 | */ | |
0305bc27 QW |
9674 | if (full) { |
9675 | if (debug) | |
0b246afa JM |
9676 | btrfs_warn(fs_info, |
9677 | "no space to alloc new chunk for block group %llu", | |
9678 | block_group->key.objectid); | |
4a5e98f5 | 9679 | goto out; |
0305bc27 | 9680 | } |
4a5e98f5 | 9681 | |
3e72ee88 | 9682 | index = btrfs_bg_flags_to_raid_index(block_group->flags); |
4a5e98f5 ID |
9683 | } |
9684 | ||
e6ec716f | 9685 | if (index == BTRFS_RAID_RAID10) { |
cdcb725c | 9686 | dev_min = 4; |
6719db6a JB |
9687 | /* Divide by 2 */ |
9688 | min_free >>= 1; | |
e6ec716f | 9689 | } else if (index == BTRFS_RAID_RAID1) { |
cdcb725c | 9690 | dev_min = 2; |
e6ec716f | 9691 | } else if (index == BTRFS_RAID_DUP) { |
6719db6a JB |
9692 | /* Multiply by 2 */ |
9693 | min_free <<= 1; | |
e6ec716f | 9694 | } else if (index == BTRFS_RAID_RAID0) { |
cdcb725c | 9695 | dev_min = fs_devices->rw_devices; |
47c5713f | 9696 | min_free = div64_u64(min_free, dev_min); |
cdcb725c | 9697 | } |
9698 | ||
6df9a95e JB |
9699 | /* We need to do this so that we can look at pending chunks */ |
9700 | trans = btrfs_join_transaction(root); | |
9701 | if (IS_ERR(trans)) { | |
9702 | ret = PTR_ERR(trans); | |
9703 | goto out; | |
9704 | } | |
9705 | ||
0b246afa | 9706 | mutex_lock(&fs_info->chunk_mutex); |
ba1bf481 | 9707 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
7bfc837d | 9708 | u64 dev_offset; |
56bec294 | 9709 | |
ba1bf481 JB |
9710 | /* |
9711 | * check to make sure we can actually find a chunk with enough | |
9712 | * space to fit our block group in. | |
9713 | */ | |
63a212ab | 9714 | if (device->total_bytes > device->bytes_used + min_free && |
401e29c1 | 9715 | !test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { |
6df9a95e | 9716 | ret = find_free_dev_extent(trans, device, min_free, |
7bfc837d | 9717 | &dev_offset, NULL); |
ba1bf481 | 9718 | if (!ret) |
cdcb725c | 9719 | dev_nr++; |
9720 | ||
9721 | if (dev_nr >= dev_min) | |
73e48b27 | 9722 | break; |
cdcb725c | 9723 | |
ba1bf481 | 9724 | ret = -1; |
725c8463 | 9725 | } |
edbd8d4e | 9726 | } |
0305bc27 | 9727 | if (debug && ret == -1) |
0b246afa JM |
9728 | btrfs_warn(fs_info, |
9729 | "no space to allocate a new chunk for block group %llu", | |
9730 | block_group->key.objectid); | |
9731 | mutex_unlock(&fs_info->chunk_mutex); | |
3a45bb20 | 9732 | btrfs_end_transaction(trans); |
edbd8d4e | 9733 | out: |
ba1bf481 | 9734 | btrfs_put_block_group(block_group); |
edbd8d4e CM |
9735 | return ret; |
9736 | } | |
9737 | ||
6bccf3ab JM |
9738 | static int find_first_block_group(struct btrfs_fs_info *fs_info, |
9739 | struct btrfs_path *path, | |
9740 | struct btrfs_key *key) | |
0b86a832 | 9741 | { |
6bccf3ab | 9742 | struct btrfs_root *root = fs_info->extent_root; |
925baedd | 9743 | int ret = 0; |
0b86a832 CM |
9744 | struct btrfs_key found_key; |
9745 | struct extent_buffer *leaf; | |
9746 | int slot; | |
edbd8d4e | 9747 | |
0b86a832 CM |
9748 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
9749 | if (ret < 0) | |
925baedd CM |
9750 | goto out; |
9751 | ||
d397712b | 9752 | while (1) { |
0b86a832 | 9753 | slot = path->slots[0]; |
edbd8d4e | 9754 | leaf = path->nodes[0]; |
0b86a832 CM |
9755 | if (slot >= btrfs_header_nritems(leaf)) { |
9756 | ret = btrfs_next_leaf(root, path); | |
9757 | if (ret == 0) | |
9758 | continue; | |
9759 | if (ret < 0) | |
925baedd | 9760 | goto out; |
0b86a832 | 9761 | break; |
edbd8d4e | 9762 | } |
0b86a832 | 9763 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 9764 | |
0b86a832 | 9765 | if (found_key.objectid >= key->objectid && |
925baedd | 9766 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
6fb37b75 LB |
9767 | struct extent_map_tree *em_tree; |
9768 | struct extent_map *em; | |
9769 | ||
9770 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
9771 | read_lock(&em_tree->lock); | |
9772 | em = lookup_extent_mapping(em_tree, found_key.objectid, | |
9773 | found_key.offset); | |
9774 | read_unlock(&em_tree->lock); | |
9775 | if (!em) { | |
0b246afa | 9776 | btrfs_err(fs_info, |
6fb37b75 LB |
9777 | "logical %llu len %llu found bg but no related chunk", |
9778 | found_key.objectid, found_key.offset); | |
9779 | ret = -ENOENT; | |
9780 | } else { | |
9781 | ret = 0; | |
9782 | } | |
187ee58c | 9783 | free_extent_map(em); |
925baedd CM |
9784 | goto out; |
9785 | } | |
0b86a832 | 9786 | path->slots[0]++; |
edbd8d4e | 9787 | } |
925baedd | 9788 | out: |
0b86a832 | 9789 | return ret; |
edbd8d4e CM |
9790 | } |
9791 | ||
0af3d00b JB |
9792 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info) |
9793 | { | |
9794 | struct btrfs_block_group_cache *block_group; | |
9795 | u64 last = 0; | |
9796 | ||
9797 | while (1) { | |
9798 | struct inode *inode; | |
9799 | ||
9800 | block_group = btrfs_lookup_first_block_group(info, last); | |
9801 | while (block_group) { | |
9802 | spin_lock(&block_group->lock); | |
9803 | if (block_group->iref) | |
9804 | break; | |
9805 | spin_unlock(&block_group->lock); | |
2ff7e61e | 9806 | block_group = next_block_group(info, block_group); |
0af3d00b JB |
9807 | } |
9808 | if (!block_group) { | |
9809 | if (last == 0) | |
9810 | break; | |
9811 | last = 0; | |
9812 | continue; | |
9813 | } | |
9814 | ||
9815 | inode = block_group->inode; | |
9816 | block_group->iref = 0; | |
9817 | block_group->inode = NULL; | |
9818 | spin_unlock(&block_group->lock); | |
f3bca802 | 9819 | ASSERT(block_group->io_ctl.inode == NULL); |
0af3d00b JB |
9820 | iput(inode); |
9821 | last = block_group->key.objectid + block_group->key.offset; | |
9822 | btrfs_put_block_group(block_group); | |
9823 | } | |
9824 | } | |
9825 | ||
5cdd7db6 FM |
9826 | /* |
9827 | * Must be called only after stopping all workers, since we could have block | |
9828 | * group caching kthreads running, and therefore they could race with us if we | |
9829 | * freed the block groups before stopping them. | |
9830 | */ | |
1a40e23b ZY |
9831 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9832 | { | |
9833 | struct btrfs_block_group_cache *block_group; | |
4184ea7f | 9834 | struct btrfs_space_info *space_info; |
11833d66 | 9835 | struct btrfs_caching_control *caching_ctl; |
1a40e23b ZY |
9836 | struct rb_node *n; |
9837 | ||
9e351cc8 | 9838 | down_write(&info->commit_root_sem); |
11833d66 YZ |
9839 | while (!list_empty(&info->caching_block_groups)) { |
9840 | caching_ctl = list_entry(info->caching_block_groups.next, | |
9841 | struct btrfs_caching_control, list); | |
9842 | list_del(&caching_ctl->list); | |
9843 | put_caching_control(caching_ctl); | |
9844 | } | |
9e351cc8 | 9845 | up_write(&info->commit_root_sem); |
11833d66 | 9846 | |
47ab2a6c JB |
9847 | spin_lock(&info->unused_bgs_lock); |
9848 | while (!list_empty(&info->unused_bgs)) { | |
9849 | block_group = list_first_entry(&info->unused_bgs, | |
9850 | struct btrfs_block_group_cache, | |
9851 | bg_list); | |
9852 | list_del_init(&block_group->bg_list); | |
9853 | btrfs_put_block_group(block_group); | |
9854 | } | |
9855 | spin_unlock(&info->unused_bgs_lock); | |
9856 | ||
1a40e23b ZY |
9857 | spin_lock(&info->block_group_cache_lock); |
9858 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { | |
9859 | block_group = rb_entry(n, struct btrfs_block_group_cache, | |
9860 | cache_node); | |
1a40e23b ZY |
9861 | rb_erase(&block_group->cache_node, |
9862 | &info->block_group_cache_tree); | |
01eacb27 | 9863 | RB_CLEAR_NODE(&block_group->cache_node); |
d899e052 YZ |
9864 | spin_unlock(&info->block_group_cache_lock); |
9865 | ||
80eb234a | 9866 | down_write(&block_group->space_info->groups_sem); |
1a40e23b | 9867 | list_del(&block_group->list); |
80eb234a | 9868 | up_write(&block_group->space_info->groups_sem); |
d2fb3437 | 9869 | |
3c14874a JB |
9870 | /* |
9871 | * We haven't cached this block group, which means we could | |
9872 | * possibly have excluded extents on this block group. | |
9873 | */ | |
36cce922 JB |
9874 | if (block_group->cached == BTRFS_CACHE_NO || |
9875 | block_group->cached == BTRFS_CACHE_ERROR) | |
2ff7e61e | 9876 | free_excluded_extents(info, block_group); |
3c14874a | 9877 | |
817d52f8 | 9878 | btrfs_remove_free_space_cache(block_group); |
5cdd7db6 | 9879 | ASSERT(block_group->cached != BTRFS_CACHE_STARTED); |
f3bca802 LB |
9880 | ASSERT(list_empty(&block_group->dirty_list)); |
9881 | ASSERT(list_empty(&block_group->io_list)); | |
9882 | ASSERT(list_empty(&block_group->bg_list)); | |
9883 | ASSERT(atomic_read(&block_group->count) == 1); | |
11dfe35a | 9884 | btrfs_put_block_group(block_group); |
d899e052 YZ |
9885 | |
9886 | spin_lock(&info->block_group_cache_lock); | |
1a40e23b ZY |
9887 | } |
9888 | spin_unlock(&info->block_group_cache_lock); | |
4184ea7f CM |
9889 | |
9890 | /* now that all the block groups are freed, go through and | |
9891 | * free all the space_info structs. This is only called during | |
9892 | * the final stages of unmount, and so we know nobody is | |
9893 | * using them. We call synchronize_rcu() once before we start, | |
9894 | * just to be on the safe side. | |
9895 | */ | |
9896 | synchronize_rcu(); | |
9897 | ||
8929ecfa YZ |
9898 | release_global_block_rsv(info); |
9899 | ||
67871254 | 9900 | while (!list_empty(&info->space_info)) { |
6ab0a202 JM |
9901 | int i; |
9902 | ||
4184ea7f CM |
9903 | space_info = list_entry(info->space_info.next, |
9904 | struct btrfs_space_info, | |
9905 | list); | |
d555b6c3 JB |
9906 | |
9907 | /* | |
9908 | * Do not hide this behind enospc_debug, this is actually | |
9909 | * important and indicates a real bug if this happens. | |
9910 | */ | |
9911 | if (WARN_ON(space_info->bytes_pinned > 0 || | |
b069e0c3 | 9912 | space_info->bytes_reserved > 0 || |
d555b6c3 | 9913 | space_info->bytes_may_use > 0)) |
ab8d0fc4 | 9914 | dump_space_info(info, space_info, 0, 0); |
4184ea7f | 9915 | list_del(&space_info->list); |
6ab0a202 JM |
9916 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
9917 | struct kobject *kobj; | |
c1895442 JM |
9918 | kobj = space_info->block_group_kobjs[i]; |
9919 | space_info->block_group_kobjs[i] = NULL; | |
9920 | if (kobj) { | |
6ab0a202 JM |
9921 | kobject_del(kobj); |
9922 | kobject_put(kobj); | |
9923 | } | |
9924 | } | |
9925 | kobject_del(&space_info->kobj); | |
9926 | kobject_put(&space_info->kobj); | |
4184ea7f | 9927 | } |
1a40e23b ZY |
9928 | return 0; |
9929 | } | |
9930 | ||
75cb379d JM |
9931 | /* link_block_group will queue up kobjects to add when we're reclaim-safe */ |
9932 | void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info) | |
9933 | { | |
9934 | struct btrfs_space_info *space_info; | |
9935 | struct raid_kobject *rkobj; | |
9936 | LIST_HEAD(list); | |
9937 | int index; | |
9938 | int ret = 0; | |
9939 | ||
9940 | spin_lock(&fs_info->pending_raid_kobjs_lock); | |
9941 | list_splice_init(&fs_info->pending_raid_kobjs, &list); | |
9942 | spin_unlock(&fs_info->pending_raid_kobjs_lock); | |
9943 | ||
9944 | list_for_each_entry(rkobj, &list, list) { | |
9945 | space_info = __find_space_info(fs_info, rkobj->flags); | |
9946 | index = btrfs_bg_flags_to_raid_index(rkobj->flags); | |
9947 | ||
9948 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, | |
9949 | "%s", get_raid_name(index)); | |
9950 | if (ret) { | |
9951 | kobject_put(&rkobj->kobj); | |
9952 | break; | |
9953 | } | |
9954 | } | |
9955 | if (ret) | |
9956 | btrfs_warn(fs_info, | |
9957 | "failed to add kobject for block cache, ignoring"); | |
9958 | } | |
9959 | ||
c434d21c | 9960 | static void link_block_group(struct btrfs_block_group_cache *cache) |
b742bb82 | 9961 | { |
c434d21c | 9962 | struct btrfs_space_info *space_info = cache->space_info; |
75cb379d | 9963 | struct btrfs_fs_info *fs_info = cache->fs_info; |
3e72ee88 | 9964 | int index = btrfs_bg_flags_to_raid_index(cache->flags); |
ed55b6ac | 9965 | bool first = false; |
b742bb82 YZ |
9966 | |
9967 | down_write(&space_info->groups_sem); | |
ed55b6ac JM |
9968 | if (list_empty(&space_info->block_groups[index])) |
9969 | first = true; | |
9970 | list_add_tail(&cache->list, &space_info->block_groups[index]); | |
9971 | up_write(&space_info->groups_sem); | |
9972 | ||
9973 | if (first) { | |
75cb379d JM |
9974 | struct raid_kobject *rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); |
9975 | if (!rkobj) { | |
9976 | btrfs_warn(cache->fs_info, | |
9977 | "couldn't alloc memory for raid level kobject"); | |
9978 | return; | |
6ab0a202 | 9979 | } |
75cb379d JM |
9980 | rkobj->flags = cache->flags; |
9981 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
9982 | ||
9983 | spin_lock(&fs_info->pending_raid_kobjs_lock); | |
9984 | list_add_tail(&rkobj->list, &fs_info->pending_raid_kobjs); | |
9985 | spin_unlock(&fs_info->pending_raid_kobjs_lock); | |
c1895442 | 9986 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
6ab0a202 | 9987 | } |
b742bb82 YZ |
9988 | } |
9989 | ||
920e4a58 | 9990 | static struct btrfs_block_group_cache * |
2ff7e61e JM |
9991 | btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info, |
9992 | u64 start, u64 size) | |
920e4a58 MX |
9993 | { |
9994 | struct btrfs_block_group_cache *cache; | |
9995 | ||
9996 | cache = kzalloc(sizeof(*cache), GFP_NOFS); | |
9997 | if (!cache) | |
9998 | return NULL; | |
9999 | ||
10000 | cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), | |
10001 | GFP_NOFS); | |
10002 | if (!cache->free_space_ctl) { | |
10003 | kfree(cache); | |
10004 | return NULL; | |
10005 | } | |
10006 | ||
10007 | cache->key.objectid = start; | |
10008 | cache->key.offset = size; | |
10009 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; | |
10010 | ||
0b246afa | 10011 | cache->fs_info = fs_info; |
e4ff5fb5 | 10012 | cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start); |
1e144fb8 OS |
10013 | set_free_space_tree_thresholds(cache); |
10014 | ||
920e4a58 MX |
10015 | atomic_set(&cache->count, 1); |
10016 | spin_lock_init(&cache->lock); | |
e570fd27 | 10017 | init_rwsem(&cache->data_rwsem); |
920e4a58 MX |
10018 | INIT_LIST_HEAD(&cache->list); |
10019 | INIT_LIST_HEAD(&cache->cluster_list); | |
47ab2a6c | 10020 | INIT_LIST_HEAD(&cache->bg_list); |
633c0aad | 10021 | INIT_LIST_HEAD(&cache->ro_list); |
ce93ec54 | 10022 | INIT_LIST_HEAD(&cache->dirty_list); |
c9dc4c65 | 10023 | INIT_LIST_HEAD(&cache->io_list); |
920e4a58 | 10024 | btrfs_init_free_space_ctl(cache); |
04216820 | 10025 | atomic_set(&cache->trimming, 0); |
a5ed9182 | 10026 | mutex_init(&cache->free_space_lock); |
0966a7b1 | 10027 | btrfs_init_full_stripe_locks_tree(&cache->full_stripe_locks_root); |
920e4a58 MX |
10028 | |
10029 | return cache; | |
10030 | } | |
10031 | ||
5b4aacef | 10032 | int btrfs_read_block_groups(struct btrfs_fs_info *info) |
9078a3e1 CM |
10033 | { |
10034 | struct btrfs_path *path; | |
10035 | int ret; | |
9078a3e1 | 10036 | struct btrfs_block_group_cache *cache; |
6324fbf3 | 10037 | struct btrfs_space_info *space_info; |
9078a3e1 CM |
10038 | struct btrfs_key key; |
10039 | struct btrfs_key found_key; | |
5f39d397 | 10040 | struct extent_buffer *leaf; |
0af3d00b JB |
10041 | int need_clear = 0; |
10042 | u64 cache_gen; | |
49303381 LB |
10043 | u64 feature; |
10044 | int mixed; | |
10045 | ||
10046 | feature = btrfs_super_incompat_flags(info->super_copy); | |
10047 | mixed = !!(feature & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS); | |
96b5179d | 10048 | |
9078a3e1 | 10049 | key.objectid = 0; |
0b86a832 | 10050 | key.offset = 0; |
962a298f | 10051 | key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
9078a3e1 CM |
10052 | path = btrfs_alloc_path(); |
10053 | if (!path) | |
10054 | return -ENOMEM; | |
e4058b54 | 10055 | path->reada = READA_FORWARD; |
9078a3e1 | 10056 | |
0b246afa JM |
10057 | cache_gen = btrfs_super_cache_generation(info->super_copy); |
10058 | if (btrfs_test_opt(info, SPACE_CACHE) && | |
10059 | btrfs_super_generation(info->super_copy) != cache_gen) | |
0af3d00b | 10060 | need_clear = 1; |
0b246afa | 10061 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
88c2ba3b | 10062 | need_clear = 1; |
0af3d00b | 10063 | |
d397712b | 10064 | while (1) { |
6bccf3ab | 10065 | ret = find_first_block_group(info, path, &key); |
b742bb82 YZ |
10066 | if (ret > 0) |
10067 | break; | |
0b86a832 CM |
10068 | if (ret != 0) |
10069 | goto error; | |
920e4a58 | 10070 | |
5f39d397 CM |
10071 | leaf = path->nodes[0]; |
10072 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
920e4a58 | 10073 | |
2ff7e61e | 10074 | cache = btrfs_create_block_group_cache(info, found_key.objectid, |
920e4a58 | 10075 | found_key.offset); |
9078a3e1 | 10076 | if (!cache) { |
0b86a832 | 10077 | ret = -ENOMEM; |
f0486c68 | 10078 | goto error; |
9078a3e1 | 10079 | } |
96303081 | 10080 | |
cf7c1ef6 LB |
10081 | if (need_clear) { |
10082 | /* | |
10083 | * When we mount with old space cache, we need to | |
10084 | * set BTRFS_DC_CLEAR and set dirty flag. | |
10085 | * | |
10086 | * a) Setting 'BTRFS_DC_CLEAR' makes sure that we | |
10087 | * truncate the old free space cache inode and | |
10088 | * setup a new one. | |
10089 | * b) Setting 'dirty flag' makes sure that we flush | |
10090 | * the new space cache info onto disk. | |
10091 | */ | |
0b246afa | 10092 | if (btrfs_test_opt(info, SPACE_CACHE)) |
ce93ec54 | 10093 | cache->disk_cache_state = BTRFS_DC_CLEAR; |
cf7c1ef6 | 10094 | } |
0af3d00b | 10095 | |
5f39d397 CM |
10096 | read_extent_buffer(leaf, &cache->item, |
10097 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
10098 | sizeof(cache->item)); | |
920e4a58 | 10099 | cache->flags = btrfs_block_group_flags(&cache->item); |
49303381 LB |
10100 | if (!mixed && |
10101 | ((cache->flags & BTRFS_BLOCK_GROUP_METADATA) && | |
10102 | (cache->flags & BTRFS_BLOCK_GROUP_DATA))) { | |
10103 | btrfs_err(info, | |
10104 | "bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups", | |
10105 | cache->key.objectid); | |
10106 | ret = -EINVAL; | |
10107 | goto error; | |
10108 | } | |
0b86a832 | 10109 | |
9078a3e1 | 10110 | key.objectid = found_key.objectid + found_key.offset; |
b3b4aa74 | 10111 | btrfs_release_path(path); |
34d52cb6 | 10112 | |
3c14874a JB |
10113 | /* |
10114 | * We need to exclude the super stripes now so that the space | |
10115 | * info has super bytes accounted for, otherwise we'll think | |
10116 | * we have more space than we actually do. | |
10117 | */ | |
2ff7e61e | 10118 | ret = exclude_super_stripes(info, cache); |
835d974f JB |
10119 | if (ret) { |
10120 | /* | |
10121 | * We may have excluded something, so call this just in | |
10122 | * case. | |
10123 | */ | |
2ff7e61e | 10124 | free_excluded_extents(info, cache); |
920e4a58 | 10125 | btrfs_put_block_group(cache); |
835d974f JB |
10126 | goto error; |
10127 | } | |
3c14874a | 10128 | |
817d52f8 JB |
10129 | /* |
10130 | * check for two cases, either we are full, and therefore | |
10131 | * don't need to bother with the caching work since we won't | |
10132 | * find any space, or we are empty, and we can just add all | |
10133 | * the space in and be done with it. This saves us _alot_ of | |
10134 | * time, particularly in the full case. | |
10135 | */ | |
10136 | if (found_key.offset == btrfs_block_group_used(&cache->item)) { | |
11833d66 | 10137 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10138 | cache->cached = BTRFS_CACHE_FINISHED; |
2ff7e61e | 10139 | free_excluded_extents(info, cache); |
817d52f8 | 10140 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
11833d66 | 10141 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10142 | cache->cached = BTRFS_CACHE_FINISHED; |
4457c1c7 | 10143 | add_new_free_space(cache, found_key.objectid, |
817d52f8 JB |
10144 | found_key.objectid + |
10145 | found_key.offset); | |
2ff7e61e | 10146 | free_excluded_extents(info, cache); |
817d52f8 | 10147 | } |
96b5179d | 10148 | |
0b246afa | 10149 | ret = btrfs_add_block_group_cache(info, cache); |
8c579fe7 JB |
10150 | if (ret) { |
10151 | btrfs_remove_free_space_cache(cache); | |
10152 | btrfs_put_block_group(cache); | |
10153 | goto error; | |
10154 | } | |
10155 | ||
0b246afa | 10156 | trace_btrfs_add_block_group(info, cache, 0); |
d2006e6d NB |
10157 | update_space_info(info, cache->flags, found_key.offset, |
10158 | btrfs_block_group_used(&cache->item), | |
10159 | cache->bytes_super, &space_info); | |
8c579fe7 | 10160 | |
6324fbf3 | 10161 | cache->space_info = space_info; |
1b2da372 | 10162 | |
c434d21c | 10163 | link_block_group(cache); |
0f9dd46c | 10164 | |
0b246afa | 10165 | set_avail_alloc_bits(info, cache->flags); |
2ff7e61e | 10166 | if (btrfs_chunk_readonly(info, cache->key.objectid)) { |
868f401a | 10167 | inc_block_group_ro(cache, 1); |
47ab2a6c JB |
10168 | } else if (btrfs_block_group_used(&cache->item) == 0) { |
10169 | spin_lock(&info->unused_bgs_lock); | |
10170 | /* Should always be true but just in case. */ | |
10171 | if (list_empty(&cache->bg_list)) { | |
10172 | btrfs_get_block_group(cache); | |
4ed0a7a3 | 10173 | trace_btrfs_add_unused_block_group(cache); |
47ab2a6c JB |
10174 | list_add_tail(&cache->bg_list, |
10175 | &info->unused_bgs); | |
10176 | } | |
10177 | spin_unlock(&info->unused_bgs_lock); | |
10178 | } | |
9078a3e1 | 10179 | } |
b742bb82 | 10180 | |
0b246afa | 10181 | list_for_each_entry_rcu(space_info, &info->space_info, list) { |
2ff7e61e | 10182 | if (!(get_alloc_profile(info, space_info->flags) & |
b742bb82 YZ |
10183 | (BTRFS_BLOCK_GROUP_RAID10 | |
10184 | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
10185 | BTRFS_BLOCK_GROUP_RAID5 | |
10186 | BTRFS_BLOCK_GROUP_RAID6 | | |
b742bb82 YZ |
10187 | BTRFS_BLOCK_GROUP_DUP))) |
10188 | continue; | |
10189 | /* | |
10190 | * avoid allocating from un-mirrored block group if there are | |
10191 | * mirrored block groups. | |
10192 | */ | |
1095cc0d | 10193 | list_for_each_entry(cache, |
10194 | &space_info->block_groups[BTRFS_RAID_RAID0], | |
10195 | list) | |
868f401a | 10196 | inc_block_group_ro(cache, 1); |
1095cc0d | 10197 | list_for_each_entry(cache, |
10198 | &space_info->block_groups[BTRFS_RAID_SINGLE], | |
10199 | list) | |
868f401a | 10200 | inc_block_group_ro(cache, 1); |
9078a3e1 | 10201 | } |
f0486c68 | 10202 | |
75cb379d | 10203 | btrfs_add_raid_kobjects(info); |
f0486c68 | 10204 | init_global_block_rsv(info); |
0b86a832 CM |
10205 | ret = 0; |
10206 | error: | |
9078a3e1 | 10207 | btrfs_free_path(path); |
0b86a832 | 10208 | return ret; |
9078a3e1 | 10209 | } |
6324fbf3 | 10210 | |
6c686b35 | 10211 | void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans) |
ea658bad | 10212 | { |
6c686b35 | 10213 | struct btrfs_fs_info *fs_info = trans->fs_info; |
ea658bad | 10214 | struct btrfs_block_group_cache *block_group, *tmp; |
0b246afa | 10215 | struct btrfs_root *extent_root = fs_info->extent_root; |
ea658bad JB |
10216 | struct btrfs_block_group_item item; |
10217 | struct btrfs_key key; | |
10218 | int ret = 0; | |
d9a0540a | 10219 | bool can_flush_pending_bgs = trans->can_flush_pending_bgs; |
ea658bad | 10220 | |
d9a0540a | 10221 | trans->can_flush_pending_bgs = false; |
47ab2a6c | 10222 | list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) { |
ea658bad | 10223 | if (ret) |
c92f6be3 | 10224 | goto next; |
ea658bad JB |
10225 | |
10226 | spin_lock(&block_group->lock); | |
10227 | memcpy(&item, &block_group->item, sizeof(item)); | |
10228 | memcpy(&key, &block_group->key, sizeof(key)); | |
10229 | spin_unlock(&block_group->lock); | |
10230 | ||
10231 | ret = btrfs_insert_item(trans, extent_root, &key, &item, | |
10232 | sizeof(item)); | |
10233 | if (ret) | |
66642832 | 10234 | btrfs_abort_transaction(trans, ret); |
0b246afa JM |
10235 | ret = btrfs_finish_chunk_alloc(trans, fs_info, key.objectid, |
10236 | key.offset); | |
6df9a95e | 10237 | if (ret) |
66642832 | 10238 | btrfs_abort_transaction(trans, ret); |
e4e0711c | 10239 | add_block_group_free_space(trans, block_group); |
1e144fb8 | 10240 | /* already aborted the transaction if it failed. */ |
c92f6be3 FM |
10241 | next: |
10242 | list_del_init(&block_group->bg_list); | |
ea658bad | 10243 | } |
d9a0540a | 10244 | trans->can_flush_pending_bgs = can_flush_pending_bgs; |
ea658bad JB |
10245 | } |
10246 | ||
6324fbf3 | 10247 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
2ff7e61e | 10248 | struct btrfs_fs_info *fs_info, u64 bytes_used, |
0174484d | 10249 | u64 type, u64 chunk_offset, u64 size) |
6324fbf3 | 10250 | { |
6324fbf3 | 10251 | struct btrfs_block_group_cache *cache; |
0b246afa | 10252 | int ret; |
6324fbf3 | 10253 | |
0b246afa | 10254 | btrfs_set_log_full_commit(fs_info, trans); |
e02119d5 | 10255 | |
2ff7e61e | 10256 | cache = btrfs_create_block_group_cache(fs_info, chunk_offset, size); |
0f9dd46c JB |
10257 | if (!cache) |
10258 | return -ENOMEM; | |
34d52cb6 | 10259 | |
6324fbf3 | 10260 | btrfs_set_block_group_used(&cache->item, bytes_used); |
0174484d NB |
10261 | btrfs_set_block_group_chunk_objectid(&cache->item, |
10262 | BTRFS_FIRST_CHUNK_TREE_OBJECTID); | |
6324fbf3 CM |
10263 | btrfs_set_block_group_flags(&cache->item, type); |
10264 | ||
920e4a58 | 10265 | cache->flags = type; |
11833d66 | 10266 | cache->last_byte_to_unpin = (u64)-1; |
817d52f8 | 10267 | cache->cached = BTRFS_CACHE_FINISHED; |
1e144fb8 | 10268 | cache->needs_free_space = 1; |
2ff7e61e | 10269 | ret = exclude_super_stripes(fs_info, cache); |
835d974f JB |
10270 | if (ret) { |
10271 | /* | |
10272 | * We may have excluded something, so call this just in | |
10273 | * case. | |
10274 | */ | |
2ff7e61e | 10275 | free_excluded_extents(fs_info, cache); |
920e4a58 | 10276 | btrfs_put_block_group(cache); |
835d974f JB |
10277 | return ret; |
10278 | } | |
96303081 | 10279 | |
4457c1c7 | 10280 | add_new_free_space(cache, chunk_offset, chunk_offset + size); |
817d52f8 | 10281 | |
2ff7e61e | 10282 | free_excluded_extents(fs_info, cache); |
11833d66 | 10283 | |
d0bd4560 | 10284 | #ifdef CONFIG_BTRFS_DEBUG |
2ff7e61e | 10285 | if (btrfs_should_fragment_free_space(cache)) { |
d0bd4560 JB |
10286 | u64 new_bytes_used = size - bytes_used; |
10287 | ||
10288 | bytes_used += new_bytes_used >> 1; | |
2ff7e61e | 10289 | fragment_free_space(cache); |
d0bd4560 JB |
10290 | } |
10291 | #endif | |
2e6e5183 | 10292 | /* |
2be12ef7 NB |
10293 | * Ensure the corresponding space_info object is created and |
10294 | * assigned to our block group. We want our bg to be added to the rbtree | |
10295 | * with its ->space_info set. | |
2e6e5183 | 10296 | */ |
2be12ef7 | 10297 | cache->space_info = __find_space_info(fs_info, cache->flags); |
dc2d3005 | 10298 | ASSERT(cache->space_info); |
2e6e5183 | 10299 | |
0b246afa | 10300 | ret = btrfs_add_block_group_cache(fs_info, cache); |
8c579fe7 JB |
10301 | if (ret) { |
10302 | btrfs_remove_free_space_cache(cache); | |
10303 | btrfs_put_block_group(cache); | |
10304 | return ret; | |
10305 | } | |
10306 | ||
2e6e5183 FM |
10307 | /* |
10308 | * Now that our block group has its ->space_info set and is inserted in | |
10309 | * the rbtree, update the space info's counters. | |
10310 | */ | |
0b246afa | 10311 | trace_btrfs_add_block_group(fs_info, cache, 1); |
d2006e6d | 10312 | update_space_info(fs_info, cache->flags, size, bytes_used, |
e40edf2d | 10313 | cache->bytes_super, &cache->space_info); |
0b246afa | 10314 | update_global_block_rsv(fs_info); |
1b2da372 | 10315 | |
c434d21c | 10316 | link_block_group(cache); |
6324fbf3 | 10317 | |
47ab2a6c | 10318 | list_add_tail(&cache->bg_list, &trans->new_bgs); |
6324fbf3 | 10319 | |
0b246afa | 10320 | set_avail_alloc_bits(fs_info, type); |
6324fbf3 CM |
10321 | return 0; |
10322 | } | |
1a40e23b | 10323 | |
10ea00f5 ID |
10324 | static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
10325 | { | |
899c81ea ID |
10326 | u64 extra_flags = chunk_to_extended(flags) & |
10327 | BTRFS_EXTENDED_PROFILE_MASK; | |
10ea00f5 | 10328 | |
de98ced9 | 10329 | write_seqlock(&fs_info->profiles_lock); |
10ea00f5 ID |
10330 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
10331 | fs_info->avail_data_alloc_bits &= ~extra_flags; | |
10332 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
10333 | fs_info->avail_metadata_alloc_bits &= ~extra_flags; | |
10334 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
10335 | fs_info->avail_system_alloc_bits &= ~extra_flags; | |
de98ced9 | 10336 | write_sequnlock(&fs_info->profiles_lock); |
10ea00f5 ID |
10337 | } |
10338 | ||
1a40e23b | 10339 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
6bccf3ab | 10340 | struct btrfs_fs_info *fs_info, u64 group_start, |
04216820 | 10341 | struct extent_map *em) |
1a40e23b | 10342 | { |
6bccf3ab | 10343 | struct btrfs_root *root = fs_info->extent_root; |
1a40e23b ZY |
10344 | struct btrfs_path *path; |
10345 | struct btrfs_block_group_cache *block_group; | |
44fb5511 | 10346 | struct btrfs_free_cluster *cluster; |
0b246afa | 10347 | struct btrfs_root *tree_root = fs_info->tree_root; |
1a40e23b | 10348 | struct btrfs_key key; |
0af3d00b | 10349 | struct inode *inode; |
c1895442 | 10350 | struct kobject *kobj = NULL; |
1a40e23b | 10351 | int ret; |
10ea00f5 | 10352 | int index; |
89a55897 | 10353 | int factor; |
4f69cb98 | 10354 | struct btrfs_caching_control *caching_ctl = NULL; |
04216820 | 10355 | bool remove_em; |
1a40e23b | 10356 | |
6bccf3ab | 10357 | block_group = btrfs_lookup_block_group(fs_info, group_start); |
1a40e23b | 10358 | BUG_ON(!block_group); |
c146afad | 10359 | BUG_ON(!block_group->ro); |
1a40e23b | 10360 | |
4ed0a7a3 | 10361 | trace_btrfs_remove_block_group(block_group); |
9f7c43c9 | 10362 | /* |
10363 | * Free the reserved super bytes from this block group before | |
10364 | * remove it. | |
10365 | */ | |
2ff7e61e | 10366 | free_excluded_extents(fs_info, block_group); |
fd708b81 JB |
10367 | btrfs_free_ref_tree_range(fs_info, block_group->key.objectid, |
10368 | block_group->key.offset); | |
9f7c43c9 | 10369 | |
1a40e23b | 10370 | memcpy(&key, &block_group->key, sizeof(key)); |
3e72ee88 | 10371 | index = btrfs_bg_flags_to_raid_index(block_group->flags); |
89a55897 JB |
10372 | if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP | |
10373 | BTRFS_BLOCK_GROUP_RAID1 | | |
10374 | BTRFS_BLOCK_GROUP_RAID10)) | |
10375 | factor = 2; | |
10376 | else | |
10377 | factor = 1; | |
1a40e23b | 10378 | |
44fb5511 | 10379 | /* make sure this block group isn't part of an allocation cluster */ |
0b246afa | 10380 | cluster = &fs_info->data_alloc_cluster; |
44fb5511 CM |
10381 | spin_lock(&cluster->refill_lock); |
10382 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
10383 | spin_unlock(&cluster->refill_lock); | |
10384 | ||
10385 | /* | |
10386 | * make sure this block group isn't part of a metadata | |
10387 | * allocation cluster | |
10388 | */ | |
0b246afa | 10389 | cluster = &fs_info->meta_alloc_cluster; |
44fb5511 CM |
10390 | spin_lock(&cluster->refill_lock); |
10391 | btrfs_return_cluster_to_free_space(block_group, cluster); | |
10392 | spin_unlock(&cluster->refill_lock); | |
10393 | ||
1a40e23b | 10394 | path = btrfs_alloc_path(); |
d8926bb3 MF |
10395 | if (!path) { |
10396 | ret = -ENOMEM; | |
10397 | goto out; | |
10398 | } | |
1a40e23b | 10399 | |
1bbc621e CM |
10400 | /* |
10401 | * get the inode first so any iput calls done for the io_list | |
10402 | * aren't the final iput (no unlinks allowed now) | |
10403 | */ | |
77ab86bf | 10404 | inode = lookup_free_space_inode(fs_info, block_group, path); |
1bbc621e CM |
10405 | |
10406 | mutex_lock(&trans->transaction->cache_write_mutex); | |
10407 | /* | |
10408 | * make sure our free spache cache IO is done before remove the | |
10409 | * free space inode | |
10410 | */ | |
10411 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
10412 | if (!list_empty(&block_group->io_list)) { | |
10413 | list_del_init(&block_group->io_list); | |
10414 | ||
10415 | WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); | |
10416 | ||
10417 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
afdb5718 | 10418 | btrfs_wait_cache_io(trans, block_group, path); |
1bbc621e CM |
10419 | btrfs_put_block_group(block_group); |
10420 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
10421 | } | |
10422 | ||
10423 | if (!list_empty(&block_group->dirty_list)) { | |
10424 | list_del_init(&block_group->dirty_list); | |
10425 | btrfs_put_block_group(block_group); | |
10426 | } | |
10427 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
10428 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
10429 | ||
0af3d00b | 10430 | if (!IS_ERR(inode)) { |
73f2e545 | 10431 | ret = btrfs_orphan_add(trans, BTRFS_I(inode)); |
79787eaa JM |
10432 | if (ret) { |
10433 | btrfs_add_delayed_iput(inode); | |
10434 | goto out; | |
10435 | } | |
0af3d00b JB |
10436 | clear_nlink(inode); |
10437 | /* One for the block groups ref */ | |
10438 | spin_lock(&block_group->lock); | |
10439 | if (block_group->iref) { | |
10440 | block_group->iref = 0; | |
10441 | block_group->inode = NULL; | |
10442 | spin_unlock(&block_group->lock); | |
10443 | iput(inode); | |
10444 | } else { | |
10445 | spin_unlock(&block_group->lock); | |
10446 | } | |
10447 | /* One for our lookup ref */ | |
455757c3 | 10448 | btrfs_add_delayed_iput(inode); |
0af3d00b JB |
10449 | } |
10450 | ||
10451 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
10452 | key.offset = block_group->key.objectid; | |
10453 | key.type = 0; | |
10454 | ||
10455 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); | |
10456 | if (ret < 0) | |
10457 | goto out; | |
10458 | if (ret > 0) | |
b3b4aa74 | 10459 | btrfs_release_path(path); |
0af3d00b JB |
10460 | if (ret == 0) { |
10461 | ret = btrfs_del_item(trans, tree_root, path); | |
10462 | if (ret) | |
10463 | goto out; | |
b3b4aa74 | 10464 | btrfs_release_path(path); |
0af3d00b JB |
10465 | } |
10466 | ||
0b246afa | 10467 | spin_lock(&fs_info->block_group_cache_lock); |
1a40e23b | 10468 | rb_erase(&block_group->cache_node, |
0b246afa | 10469 | &fs_info->block_group_cache_tree); |
292cbd51 | 10470 | RB_CLEAR_NODE(&block_group->cache_node); |
a1897fdd | 10471 | |
0b246afa JM |
10472 | if (fs_info->first_logical_byte == block_group->key.objectid) |
10473 | fs_info->first_logical_byte = (u64)-1; | |
10474 | spin_unlock(&fs_info->block_group_cache_lock); | |
817d52f8 | 10475 | |
80eb234a | 10476 | down_write(&block_group->space_info->groups_sem); |
44fb5511 CM |
10477 | /* |
10478 | * we must use list_del_init so people can check to see if they | |
10479 | * are still on the list after taking the semaphore | |
10480 | */ | |
10481 | list_del_init(&block_group->list); | |
6ab0a202 | 10482 | if (list_empty(&block_group->space_info->block_groups[index])) { |
c1895442 JM |
10483 | kobj = block_group->space_info->block_group_kobjs[index]; |
10484 | block_group->space_info->block_group_kobjs[index] = NULL; | |
0b246afa | 10485 | clear_avail_alloc_bits(fs_info, block_group->flags); |
6ab0a202 | 10486 | } |
80eb234a | 10487 | up_write(&block_group->space_info->groups_sem); |
c1895442 JM |
10488 | if (kobj) { |
10489 | kobject_del(kobj); | |
10490 | kobject_put(kobj); | |
10491 | } | |
1a40e23b | 10492 | |
4f69cb98 FM |
10493 | if (block_group->has_caching_ctl) |
10494 | caching_ctl = get_caching_control(block_group); | |
817d52f8 | 10495 | if (block_group->cached == BTRFS_CACHE_STARTED) |
11833d66 | 10496 | wait_block_group_cache_done(block_group); |
4f69cb98 | 10497 | if (block_group->has_caching_ctl) { |
0b246afa | 10498 | down_write(&fs_info->commit_root_sem); |
4f69cb98 FM |
10499 | if (!caching_ctl) { |
10500 | struct btrfs_caching_control *ctl; | |
10501 | ||
10502 | list_for_each_entry(ctl, | |
0b246afa | 10503 | &fs_info->caching_block_groups, list) |
4f69cb98 FM |
10504 | if (ctl->block_group == block_group) { |
10505 | caching_ctl = ctl; | |
1e4f4714 | 10506 | refcount_inc(&caching_ctl->count); |
4f69cb98 FM |
10507 | break; |
10508 | } | |
10509 | } | |
10510 | if (caching_ctl) | |
10511 | list_del_init(&caching_ctl->list); | |
0b246afa | 10512 | up_write(&fs_info->commit_root_sem); |
4f69cb98 FM |
10513 | if (caching_ctl) { |
10514 | /* Once for the caching bgs list and once for us. */ | |
10515 | put_caching_control(caching_ctl); | |
10516 | put_caching_control(caching_ctl); | |
10517 | } | |
10518 | } | |
817d52f8 | 10519 | |
ce93ec54 JB |
10520 | spin_lock(&trans->transaction->dirty_bgs_lock); |
10521 | if (!list_empty(&block_group->dirty_list)) { | |
1bbc621e CM |
10522 | WARN_ON(1); |
10523 | } | |
10524 | if (!list_empty(&block_group->io_list)) { | |
10525 | WARN_ON(1); | |
ce93ec54 JB |
10526 | } |
10527 | spin_unlock(&trans->transaction->dirty_bgs_lock); | |
817d52f8 JB |
10528 | btrfs_remove_free_space_cache(block_group); |
10529 | ||
c146afad | 10530 | spin_lock(&block_group->space_info->lock); |
75c68e9f | 10531 | list_del_init(&block_group->ro_list); |
18d018ad | 10532 | |
0b246afa | 10533 | if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { |
18d018ad ZL |
10534 | WARN_ON(block_group->space_info->total_bytes |
10535 | < block_group->key.offset); | |
10536 | WARN_ON(block_group->space_info->bytes_readonly | |
10537 | < block_group->key.offset); | |
10538 | WARN_ON(block_group->space_info->disk_total | |
10539 | < block_group->key.offset * factor); | |
10540 | } | |
c146afad YZ |
10541 | block_group->space_info->total_bytes -= block_group->key.offset; |
10542 | block_group->space_info->bytes_readonly -= block_group->key.offset; | |
89a55897 | 10543 | block_group->space_info->disk_total -= block_group->key.offset * factor; |
18d018ad | 10544 | |
c146afad | 10545 | spin_unlock(&block_group->space_info->lock); |
283bb197 | 10546 | |
0af3d00b JB |
10547 | memcpy(&key, &block_group->key, sizeof(key)); |
10548 | ||
34441361 | 10549 | mutex_lock(&fs_info->chunk_mutex); |
495e64f4 FM |
10550 | if (!list_empty(&em->list)) { |
10551 | /* We're in the transaction->pending_chunks list. */ | |
10552 | free_extent_map(em); | |
10553 | } | |
04216820 FM |
10554 | spin_lock(&block_group->lock); |
10555 | block_group->removed = 1; | |
10556 | /* | |
10557 | * At this point trimming can't start on this block group, because we | |
10558 | * removed the block group from the tree fs_info->block_group_cache_tree | |
10559 | * so no one can't find it anymore and even if someone already got this | |
10560 | * block group before we removed it from the rbtree, they have already | |
10561 | * incremented block_group->trimming - if they didn't, they won't find | |
10562 | * any free space entries because we already removed them all when we | |
10563 | * called btrfs_remove_free_space_cache(). | |
10564 | * | |
10565 | * And we must not remove the extent map from the fs_info->mapping_tree | |
10566 | * to prevent the same logical address range and physical device space | |
10567 | * ranges from being reused for a new block group. This is because our | |
10568 | * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is | |
10569 | * completely transactionless, so while it is trimming a range the | |
10570 | * currently running transaction might finish and a new one start, | |
10571 | * allowing for new block groups to be created that can reuse the same | |
10572 | * physical device locations unless we take this special care. | |
e33e17ee JM |
10573 | * |
10574 | * There may also be an implicit trim operation if the file system | |
10575 | * is mounted with -odiscard. The same protections must remain | |
10576 | * in place until the extents have been discarded completely when | |
10577 | * the transaction commit has completed. | |
04216820 FM |
10578 | */ |
10579 | remove_em = (atomic_read(&block_group->trimming) == 0); | |
10580 | /* | |
10581 | * Make sure a trimmer task always sees the em in the pinned_chunks list | |
10582 | * if it sees block_group->removed == 1 (needs to lock block_group->lock | |
10583 | * before checking block_group->removed). | |
10584 | */ | |
10585 | if (!remove_em) { | |
10586 | /* | |
10587 | * Our em might be in trans->transaction->pending_chunks which | |
10588 | * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks), | |
10589 | * and so is the fs_info->pinned_chunks list. | |
10590 | * | |
10591 | * So at this point we must be holding the chunk_mutex to avoid | |
10592 | * any races with chunk allocation (more specifically at | |
10593 | * volumes.c:contains_pending_extent()), to ensure it always | |
10594 | * sees the em, either in the pending_chunks list or in the | |
10595 | * pinned_chunks list. | |
10596 | */ | |
0b246afa | 10597 | list_move_tail(&em->list, &fs_info->pinned_chunks); |
04216820 FM |
10598 | } |
10599 | spin_unlock(&block_group->lock); | |
04216820 FM |
10600 | |
10601 | if (remove_em) { | |
10602 | struct extent_map_tree *em_tree; | |
10603 | ||
0b246afa | 10604 | em_tree = &fs_info->mapping_tree.map_tree; |
04216820 | 10605 | write_lock(&em_tree->lock); |
8dbcd10f FM |
10606 | /* |
10607 | * The em might be in the pending_chunks list, so make sure the | |
10608 | * chunk mutex is locked, since remove_extent_mapping() will | |
10609 | * delete us from that list. | |
10610 | */ | |
04216820 FM |
10611 | remove_extent_mapping(em_tree, em); |
10612 | write_unlock(&em_tree->lock); | |
10613 | /* once for the tree */ | |
10614 | free_extent_map(em); | |
10615 | } | |
10616 | ||
34441361 | 10617 | mutex_unlock(&fs_info->chunk_mutex); |
8dbcd10f | 10618 | |
f3f72779 | 10619 | ret = remove_block_group_free_space(trans, block_group); |
1e144fb8 OS |
10620 | if (ret) |
10621 | goto out; | |
10622 | ||
fa9c0d79 CM |
10623 | btrfs_put_block_group(block_group); |
10624 | btrfs_put_block_group(block_group); | |
1a40e23b ZY |
10625 | |
10626 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
10627 | if (ret > 0) | |
10628 | ret = -EIO; | |
10629 | if (ret < 0) | |
10630 | goto out; | |
10631 | ||
10632 | ret = btrfs_del_item(trans, root, path); | |
10633 | out: | |
10634 | btrfs_free_path(path); | |
10635 | return ret; | |
10636 | } | |
acce952b | 10637 | |
8eab77ff | 10638 | struct btrfs_trans_handle * |
7fd01182 FM |
10639 | btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info, |
10640 | const u64 chunk_offset) | |
8eab77ff | 10641 | { |
7fd01182 FM |
10642 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
10643 | struct extent_map *em; | |
10644 | struct map_lookup *map; | |
10645 | unsigned int num_items; | |
10646 | ||
10647 | read_lock(&em_tree->lock); | |
10648 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); | |
10649 | read_unlock(&em_tree->lock); | |
10650 | ASSERT(em && em->start == chunk_offset); | |
10651 | ||
8eab77ff | 10652 | /* |
7fd01182 FM |
10653 | * We need to reserve 3 + N units from the metadata space info in order |
10654 | * to remove a block group (done at btrfs_remove_chunk() and at | |
10655 | * btrfs_remove_block_group()), which are used for: | |
10656 | * | |
8eab77ff FM |
10657 | * 1 unit for adding the free space inode's orphan (located in the tree |
10658 | * of tree roots). | |
7fd01182 FM |
10659 | * 1 unit for deleting the block group item (located in the extent |
10660 | * tree). | |
10661 | * 1 unit for deleting the free space item (located in tree of tree | |
10662 | * roots). | |
10663 | * N units for deleting N device extent items corresponding to each | |
10664 | * stripe (located in the device tree). | |
10665 | * | |
10666 | * In order to remove a block group we also need to reserve units in the | |
10667 | * system space info in order to update the chunk tree (update one or | |
10668 | * more device items and remove one chunk item), but this is done at | |
10669 | * btrfs_remove_chunk() through a call to check_system_chunk(). | |
8eab77ff | 10670 | */ |
95617d69 | 10671 | map = em->map_lookup; |
7fd01182 FM |
10672 | num_items = 3 + map->num_stripes; |
10673 | free_extent_map(em); | |
10674 | ||
8eab77ff | 10675 | return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root, |
7fd01182 | 10676 | num_items, 1); |
8eab77ff FM |
10677 | } |
10678 | ||
47ab2a6c JB |
10679 | /* |
10680 | * Process the unused_bgs list and remove any that don't have any allocated | |
10681 | * space inside of them. | |
10682 | */ | |
10683 | void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) | |
10684 | { | |
10685 | struct btrfs_block_group_cache *block_group; | |
10686 | struct btrfs_space_info *space_info; | |
47ab2a6c JB |
10687 | struct btrfs_trans_handle *trans; |
10688 | int ret = 0; | |
10689 | ||
afcdd129 | 10690 | if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags)) |
47ab2a6c JB |
10691 | return; |
10692 | ||
10693 | spin_lock(&fs_info->unused_bgs_lock); | |
10694 | while (!list_empty(&fs_info->unused_bgs)) { | |
10695 | u64 start, end; | |
e33e17ee | 10696 | int trimming; |
47ab2a6c JB |
10697 | |
10698 | block_group = list_first_entry(&fs_info->unused_bgs, | |
10699 | struct btrfs_block_group_cache, | |
10700 | bg_list); | |
47ab2a6c | 10701 | list_del_init(&block_group->bg_list); |
aefbe9a6 ZL |
10702 | |
10703 | space_info = block_group->space_info; | |
10704 | ||
47ab2a6c JB |
10705 | if (ret || btrfs_mixed_space_info(space_info)) { |
10706 | btrfs_put_block_group(block_group); | |
10707 | continue; | |
10708 | } | |
10709 | spin_unlock(&fs_info->unused_bgs_lock); | |
10710 | ||
d5f2e33b | 10711 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
67c5e7d4 | 10712 | |
47ab2a6c JB |
10713 | /* Don't want to race with allocators so take the groups_sem */ |
10714 | down_write(&space_info->groups_sem); | |
10715 | spin_lock(&block_group->lock); | |
10716 | if (block_group->reserved || | |
10717 | btrfs_block_group_used(&block_group->item) || | |
19c4d2f9 | 10718 | block_group->ro || |
aefbe9a6 | 10719 | list_is_singular(&block_group->list)) { |
47ab2a6c JB |
10720 | /* |
10721 | * We want to bail if we made new allocations or have | |
10722 | * outstanding allocations in this block group. We do | |
10723 | * the ro check in case balance is currently acting on | |
10724 | * this block group. | |
10725 | */ | |
4ed0a7a3 | 10726 | trace_btrfs_skip_unused_block_group(block_group); |
47ab2a6c JB |
10727 | spin_unlock(&block_group->lock); |
10728 | up_write(&space_info->groups_sem); | |
10729 | goto next; | |
10730 | } | |
10731 | spin_unlock(&block_group->lock); | |
10732 | ||
10733 | /* We don't want to force the issue, only flip if it's ok. */ | |
868f401a | 10734 | ret = inc_block_group_ro(block_group, 0); |
47ab2a6c JB |
10735 | up_write(&space_info->groups_sem); |
10736 | if (ret < 0) { | |
10737 | ret = 0; | |
10738 | goto next; | |
10739 | } | |
10740 | ||
10741 | /* | |
10742 | * Want to do this before we do anything else so we can recover | |
10743 | * properly if we fail to join the transaction. | |
10744 | */ | |
7fd01182 FM |
10745 | trans = btrfs_start_trans_remove_block_group(fs_info, |
10746 | block_group->key.objectid); | |
47ab2a6c | 10747 | if (IS_ERR(trans)) { |
2ff7e61e | 10748 | btrfs_dec_block_group_ro(block_group); |
47ab2a6c JB |
10749 | ret = PTR_ERR(trans); |
10750 | goto next; | |
10751 | } | |
10752 | ||
10753 | /* | |
10754 | * We could have pending pinned extents for this block group, | |
10755 | * just delete them, we don't care about them anymore. | |
10756 | */ | |
10757 | start = block_group->key.objectid; | |
10758 | end = start + block_group->key.offset - 1; | |
d4b450cd FM |
10759 | /* |
10760 | * Hold the unused_bg_unpin_mutex lock to avoid racing with | |
10761 | * btrfs_finish_extent_commit(). If we are at transaction N, | |
10762 | * another task might be running finish_extent_commit() for the | |
10763 | * previous transaction N - 1, and have seen a range belonging | |
10764 | * to the block group in freed_extents[] before we were able to | |
10765 | * clear the whole block group range from freed_extents[]. This | |
10766 | * means that task can lookup for the block group after we | |
10767 | * unpinned it from freed_extents[] and removed it, leading to | |
10768 | * a BUG_ON() at btrfs_unpin_extent_range(). | |
10769 | */ | |
10770 | mutex_lock(&fs_info->unused_bg_unpin_mutex); | |
758eb51e | 10771 | ret = clear_extent_bits(&fs_info->freed_extents[0], start, end, |
91166212 | 10772 | EXTENT_DIRTY); |
758eb51e | 10773 | if (ret) { |
d4b450cd | 10774 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
2ff7e61e | 10775 | btrfs_dec_block_group_ro(block_group); |
758eb51e FM |
10776 | goto end_trans; |
10777 | } | |
10778 | ret = clear_extent_bits(&fs_info->freed_extents[1], start, end, | |
91166212 | 10779 | EXTENT_DIRTY); |
758eb51e | 10780 | if (ret) { |
d4b450cd | 10781 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
2ff7e61e | 10782 | btrfs_dec_block_group_ro(block_group); |
758eb51e FM |
10783 | goto end_trans; |
10784 | } | |
d4b450cd | 10785 | mutex_unlock(&fs_info->unused_bg_unpin_mutex); |
47ab2a6c JB |
10786 | |
10787 | /* Reset pinned so btrfs_put_block_group doesn't complain */ | |
c30666d4 ZL |
10788 | spin_lock(&space_info->lock); |
10789 | spin_lock(&block_group->lock); | |
10790 | ||
10791 | space_info->bytes_pinned -= block_group->pinned; | |
10792 | space_info->bytes_readonly += block_group->pinned; | |
10793 | percpu_counter_add(&space_info->total_bytes_pinned, | |
10794 | -block_group->pinned); | |
47ab2a6c JB |
10795 | block_group->pinned = 0; |
10796 | ||
c30666d4 ZL |
10797 | spin_unlock(&block_group->lock); |
10798 | spin_unlock(&space_info->lock); | |
10799 | ||
e33e17ee | 10800 | /* DISCARD can flip during remount */ |
0b246afa | 10801 | trimming = btrfs_test_opt(fs_info, DISCARD); |
e33e17ee JM |
10802 | |
10803 | /* Implicit trim during transaction commit. */ | |
10804 | if (trimming) | |
10805 | btrfs_get_block_group_trimming(block_group); | |
10806 | ||
47ab2a6c JB |
10807 | /* |
10808 | * Btrfs_remove_chunk will abort the transaction if things go | |
10809 | * horribly wrong. | |
10810 | */ | |
5b4aacef | 10811 | ret = btrfs_remove_chunk(trans, fs_info, |
47ab2a6c | 10812 | block_group->key.objectid); |
e33e17ee JM |
10813 | |
10814 | if (ret) { | |
10815 | if (trimming) | |
10816 | btrfs_put_block_group_trimming(block_group); | |
10817 | goto end_trans; | |
10818 | } | |
10819 | ||
10820 | /* | |
10821 | * If we're not mounted with -odiscard, we can just forget | |
10822 | * about this block group. Otherwise we'll need to wait | |
10823 | * until transaction commit to do the actual discard. | |
10824 | */ | |
10825 | if (trimming) { | |
348a0013 FM |
10826 | spin_lock(&fs_info->unused_bgs_lock); |
10827 | /* | |
10828 | * A concurrent scrub might have added us to the list | |
10829 | * fs_info->unused_bgs, so use a list_move operation | |
10830 | * to add the block group to the deleted_bgs list. | |
10831 | */ | |
e33e17ee JM |
10832 | list_move(&block_group->bg_list, |
10833 | &trans->transaction->deleted_bgs); | |
348a0013 | 10834 | spin_unlock(&fs_info->unused_bgs_lock); |
e33e17ee JM |
10835 | btrfs_get_block_group(block_group); |
10836 | } | |
758eb51e | 10837 | end_trans: |
3a45bb20 | 10838 | btrfs_end_transaction(trans); |
47ab2a6c | 10839 | next: |
d5f2e33b | 10840 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
47ab2a6c JB |
10841 | btrfs_put_block_group(block_group); |
10842 | spin_lock(&fs_info->unused_bgs_lock); | |
10843 | } | |
10844 | spin_unlock(&fs_info->unused_bgs_lock); | |
10845 | } | |
10846 | ||
c59021f8 | 10847 | int btrfs_init_space_info(struct btrfs_fs_info *fs_info) |
10848 | { | |
1aba86d6 | 10849 | struct btrfs_super_block *disk_super; |
10850 | u64 features; | |
10851 | u64 flags; | |
10852 | int mixed = 0; | |
c59021f8 | 10853 | int ret; |
10854 | ||
6c41761f | 10855 | disk_super = fs_info->super_copy; |
1aba86d6 | 10856 | if (!btrfs_super_root(disk_super)) |
0dc924c5 | 10857 | return -EINVAL; |
c59021f8 | 10858 | |
1aba86d6 | 10859 | features = btrfs_super_incompat_flags(disk_super); |
10860 | if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
10861 | mixed = 1; | |
c59021f8 | 10862 | |
1aba86d6 | 10863 | flags = BTRFS_BLOCK_GROUP_SYSTEM; |
4ca61683 | 10864 | ret = create_space_info(fs_info, flags); |
c59021f8 | 10865 | if (ret) |
1aba86d6 | 10866 | goto out; |
c59021f8 | 10867 | |
1aba86d6 | 10868 | if (mixed) { |
10869 | flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA; | |
4ca61683 | 10870 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10871 | } else { |
10872 | flags = BTRFS_BLOCK_GROUP_METADATA; | |
4ca61683 | 10873 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10874 | if (ret) |
10875 | goto out; | |
10876 | ||
10877 | flags = BTRFS_BLOCK_GROUP_DATA; | |
4ca61683 | 10878 | ret = create_space_info(fs_info, flags); |
1aba86d6 | 10879 | } |
10880 | out: | |
c59021f8 | 10881 | return ret; |
10882 | } | |
10883 | ||
2ff7e61e JM |
10884 | int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, |
10885 | u64 start, u64 end) | |
acce952b | 10886 | { |
2ff7e61e | 10887 | return unpin_extent_range(fs_info, start, end, false); |
acce952b | 10888 | } |
10889 | ||
499f377f JM |
10890 | /* |
10891 | * It used to be that old block groups would be left around forever. | |
10892 | * Iterating over them would be enough to trim unused space. Since we | |
10893 | * now automatically remove them, we also need to iterate over unallocated | |
10894 | * space. | |
10895 | * | |
10896 | * We don't want a transaction for this since the discard may take a | |
10897 | * substantial amount of time. We don't require that a transaction be | |
10898 | * running, but we do need to take a running transaction into account | |
10899 | * to ensure that we're not discarding chunks that were released in | |
10900 | * the current transaction. | |
10901 | * | |
10902 | * Holding the chunks lock will prevent other threads from allocating | |
10903 | * or releasing chunks, but it won't prevent a running transaction | |
10904 | * from committing and releasing the memory that the pending chunks | |
10905 | * list head uses. For that, we need to take a reference to the | |
10906 | * transaction. | |
10907 | */ | |
10908 | static int btrfs_trim_free_extents(struct btrfs_device *device, | |
10909 | u64 minlen, u64 *trimmed) | |
10910 | { | |
10911 | u64 start = 0, len = 0; | |
10912 | int ret; | |
10913 | ||
10914 | *trimmed = 0; | |
10915 | ||
10916 | /* Not writeable = nothing to do. */ | |
ebbede42 | 10917 | if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) |
499f377f JM |
10918 | return 0; |
10919 | ||
10920 | /* No free space = nothing to do. */ | |
10921 | if (device->total_bytes <= device->bytes_used) | |
10922 | return 0; | |
10923 | ||
10924 | ret = 0; | |
10925 | ||
10926 | while (1) { | |
fb456252 | 10927 | struct btrfs_fs_info *fs_info = device->fs_info; |
499f377f JM |
10928 | struct btrfs_transaction *trans; |
10929 | u64 bytes; | |
10930 | ||
10931 | ret = mutex_lock_interruptible(&fs_info->chunk_mutex); | |
10932 | if (ret) | |
10933 | return ret; | |
10934 | ||
10935 | down_read(&fs_info->commit_root_sem); | |
10936 | ||
10937 | spin_lock(&fs_info->trans_lock); | |
10938 | trans = fs_info->running_transaction; | |
10939 | if (trans) | |
9b64f57d | 10940 | refcount_inc(&trans->use_count); |
499f377f JM |
10941 | spin_unlock(&fs_info->trans_lock); |
10942 | ||
10943 | ret = find_free_dev_extent_start(trans, device, minlen, start, | |
10944 | &start, &len); | |
10945 | if (trans) | |
10946 | btrfs_put_transaction(trans); | |
10947 | ||
10948 | if (ret) { | |
10949 | up_read(&fs_info->commit_root_sem); | |
10950 | mutex_unlock(&fs_info->chunk_mutex); | |
10951 | if (ret == -ENOSPC) | |
10952 | ret = 0; | |
10953 | break; | |
10954 | } | |
10955 | ||
10956 | ret = btrfs_issue_discard(device->bdev, start, len, &bytes); | |
10957 | up_read(&fs_info->commit_root_sem); | |
10958 | mutex_unlock(&fs_info->chunk_mutex); | |
10959 | ||
10960 | if (ret) | |
10961 | break; | |
10962 | ||
10963 | start += len; | |
10964 | *trimmed += bytes; | |
10965 | ||
10966 | if (fatal_signal_pending(current)) { | |
10967 | ret = -ERESTARTSYS; | |
10968 | break; | |
10969 | } | |
10970 | ||
10971 | cond_resched(); | |
10972 | } | |
10973 | ||
10974 | return ret; | |
10975 | } | |
10976 | ||
2ff7e61e | 10977 | int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range) |
f7039b1d | 10978 | { |
f7039b1d | 10979 | struct btrfs_block_group_cache *cache = NULL; |
499f377f JM |
10980 | struct btrfs_device *device; |
10981 | struct list_head *devices; | |
f7039b1d LD |
10982 | u64 group_trimmed; |
10983 | u64 start; | |
10984 | u64 end; | |
10985 | u64 trimmed = 0; | |
2cac13e4 | 10986 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
10987 | int ret = 0; |
10988 | ||
2cac13e4 LB |
10989 | /* |
10990 | * try to trim all FS space, our block group may start from non-zero. | |
10991 | */ | |
10992 | if (range->len == total_bytes) | |
10993 | cache = btrfs_lookup_first_block_group(fs_info, range->start); | |
10994 | else | |
10995 | cache = btrfs_lookup_block_group(fs_info, range->start); | |
f7039b1d LD |
10996 | |
10997 | while (cache) { | |
10998 | if (cache->key.objectid >= (range->start + range->len)) { | |
10999 | btrfs_put_block_group(cache); | |
11000 | break; | |
11001 | } | |
11002 | ||
11003 | start = max(range->start, cache->key.objectid); | |
11004 | end = min(range->start + range->len, | |
11005 | cache->key.objectid + cache->key.offset); | |
11006 | ||
11007 | if (end - start >= range->minlen) { | |
11008 | if (!block_group_cache_done(cache)) { | |
f6373bf3 | 11009 | ret = cache_block_group(cache, 0); |
1be41b78 JB |
11010 | if (ret) { |
11011 | btrfs_put_block_group(cache); | |
11012 | break; | |
11013 | } | |
11014 | ret = wait_block_group_cache_done(cache); | |
11015 | if (ret) { | |
11016 | btrfs_put_block_group(cache); | |
11017 | break; | |
11018 | } | |
f7039b1d LD |
11019 | } |
11020 | ret = btrfs_trim_block_group(cache, | |
11021 | &group_trimmed, | |
11022 | start, | |
11023 | end, | |
11024 | range->minlen); | |
11025 | ||
11026 | trimmed += group_trimmed; | |
11027 | if (ret) { | |
11028 | btrfs_put_block_group(cache); | |
11029 | break; | |
11030 | } | |
11031 | } | |
11032 | ||
2ff7e61e | 11033 | cache = next_block_group(fs_info, cache); |
f7039b1d LD |
11034 | } |
11035 | ||
0b246afa JM |
11036 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
11037 | devices = &fs_info->fs_devices->alloc_list; | |
499f377f JM |
11038 | list_for_each_entry(device, devices, dev_alloc_list) { |
11039 | ret = btrfs_trim_free_extents(device, range->minlen, | |
11040 | &group_trimmed); | |
11041 | if (ret) | |
11042 | break; | |
11043 | ||
11044 | trimmed += group_trimmed; | |
11045 | } | |
0b246afa | 11046 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
499f377f | 11047 | |
f7039b1d LD |
11048 | range->len = trimmed; |
11049 | return ret; | |
11050 | } | |
8257b2dc MX |
11051 | |
11052 | /* | |
ea14b57f | 11053 | * btrfs_{start,end}_write_no_snapshotting() are similar to |
9ea24bbe FM |
11054 | * mnt_{want,drop}_write(), they are used to prevent some tasks from writing |
11055 | * data into the page cache through nocow before the subvolume is snapshoted, | |
11056 | * but flush the data into disk after the snapshot creation, or to prevent | |
ea14b57f | 11057 | * operations while snapshotting is ongoing and that cause the snapshot to be |
9ea24bbe | 11058 | * inconsistent (writes followed by expanding truncates for example). |
8257b2dc | 11059 | */ |
ea14b57f | 11060 | void btrfs_end_write_no_snapshotting(struct btrfs_root *root) |
8257b2dc MX |
11061 | { |
11062 | percpu_counter_dec(&root->subv_writers->counter); | |
093258e6 | 11063 | cond_wake_up(&root->subv_writers->wait); |
8257b2dc MX |
11064 | } |
11065 | ||
ea14b57f | 11066 | int btrfs_start_write_no_snapshotting(struct btrfs_root *root) |
8257b2dc | 11067 | { |
ea14b57f | 11068 | if (atomic_read(&root->will_be_snapshotted)) |
8257b2dc MX |
11069 | return 0; |
11070 | ||
11071 | percpu_counter_inc(&root->subv_writers->counter); | |
11072 | /* | |
11073 | * Make sure counter is updated before we check for snapshot creation. | |
11074 | */ | |
11075 | smp_mb(); | |
ea14b57f DS |
11076 | if (atomic_read(&root->will_be_snapshotted)) { |
11077 | btrfs_end_write_no_snapshotting(root); | |
8257b2dc MX |
11078 | return 0; |
11079 | } | |
11080 | return 1; | |
11081 | } | |
0bc19f90 | 11082 | |
0bc19f90 ZL |
11083 | void btrfs_wait_for_snapshot_creation(struct btrfs_root *root) |
11084 | { | |
11085 | while (true) { | |
11086 | int ret; | |
11087 | ||
ea14b57f | 11088 | ret = btrfs_start_write_no_snapshotting(root); |
0bc19f90 ZL |
11089 | if (ret) |
11090 | break; | |
4625956a PZ |
11091 | wait_var_event(&root->will_be_snapshotted, |
11092 | !atomic_read(&root->will_be_snapshotted)); | |
0bc19f90 ZL |
11093 | } |
11094 | } |